CN100411784C - Electric drilling device - Google Patents
Electric drilling device Download PDFInfo
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- CN100411784C CN100411784C CNB2004800247687A CN200480024768A CN100411784C CN 100411784 C CN100411784 C CN 100411784C CN B2004800247687 A CNB2004800247687 A CN B2004800247687A CN 200480024768 A CN200480024768 A CN 200480024768A CN 100411784 C CN100411784 C CN 100411784C
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- 238000005553 drilling Methods 0.000 title claims description 64
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Abstract
An electric drill apparatus having a low profile is provided which comprises an annular cutter, a motor for rotating the annular cutter, a rotary shaft assembly for rotating the annular cutter attached to its leading end about a rotating, a rotation reduction mechanism disposed between the motor and rotary shaft assembly for transmitting a driving force of the motor to the annular cutter through the rotary shaft assembly, a feed mechanism responsive to an operation of a manual handle, for moving the rotary shaft assembly along with a straight line to advance or retract the annular cutter attached to the rotary shaft assembly with respect to a workpiece, and an adhesion base for securing the electric drill apparatus to the workpiece. The annular cutter has a plurality of cutting blades comprised of cemented carbide tips fixed on its lower end, thereby it is capable of rotating at a high speed. The rotary shaft assembly has a rotating shaft which rotates in a direction different from that of a rotating shaft of the motor, thereby the drill apparatus has a low profile.
Description
Technical field
The present invention relates generally to a kind of electric drilling device, more specifically to a kind of electric drilling device that has less profile and be used for driving again automatically drill motor in overload situations when the rotation of drill motor stops.
Background technology
At present, in newly-built, the repairing of carrying out various buildings etc. etc., need workpiece be holed, described workpiece comprises that will be set to workpiece is installed in for example steel cage of architectural position or near the structural material it.Therefore, this electric drilling device need be transported to the workpiece rigging position.In addition, drilling operation often must carry out in position that is arranged in the installation of structural material or workpiece or near the relative small space it.Therefore, in order to carry in narrow and small operating space easily and to operate, this electric drilling device need reduce size and weight.
Traditional electric drilling device generally includes motor, be used for by slide mechanism support and move along vertical direction cut usefulness cutter main shaft and be used for that energy with drill motor passes to main shaft so that the transmission mechanism that cutter rotates, these parts are arranged along vertical direction or along the direction of motion of main shaft.Therefore these vertically arranged electric drilling device general size are bigger, and can only be used in the limited operating area and limited portability.
On the contrary, WO00/54915 has disclosed the less relatively electric drill of a kind of profile, and wherein main shaft has the rotation with the rotating shaft perpendicular of drill motor.This small electrical rig is compared with the type of being arranged vertically, and its whole length reduces, and its compact size has improved its portability.
In addition, Japanese documentation (Kokoku) No.3-78205 and Japanese documentation (Kokai) No.2003-25122 have disclosed and have been arranged vertically the type electric drilling device, and described each equipment is included in the function that stops the driving of motor under the overload situations automatically.
Above these small electrical rig have and be used for this electric drilling device is fixed on workpiece so that can carry out the electromagnetic base of stable drilling operation.But,, do the electromagnetic base of this equipment less in order to make other parts that the size of this rig keeps less and this equipment together.Because its less size, this electromagnetic base can only apply less attraction.Therefore, there is a kind of like this shortcoming in this rig, and promptly its boring is limited in one's ability.
Also have, though the automatic electric drilling device described in the superincumbent Japanese Official Journal has automatic hold function when motor overload occurring, this function is main shaft to be provided comprising in the electric drilling device of the automatic shift mechanism of movement in vertical direction.Therefore, also without any such electric drilling device, that is, it has the manual transfer mechanism that is used for annular cutter, is provided with the control assembly that is used for stopping automatically the driving of motor when motor overload occurring.And then also without any such electric drilling device, that is, it has the function that drives this motor at motor owing to motor overload after stopping automatically again.
Summary of the invention
The present invention makes in view of the top problem that is occurred in the illustrational prior art electric drilling device in the above.
One object of the present invention is to provide a kind of the have size that reduces and the small electrical rig of weight.
Another object of the present invention be to provide a kind of can the small electrical rig of secure fixation on workpiece.
A further object of the invention is to provide a kind of like this electric drilling device, it can be at motor because overload and CD-ROM drive motor and have simple structure again automatically after stopping automatically to improve operability.
A further object of the present invention is to provide a kind of electric drilling device that can discern the normal of motor and overload working condition.
In order to realize top purpose, the present invention provides one and electric drilling device with less profile in first aspect, and this equipment comprises:
Main body;
Be installed in the motor on the main body;
Main shaft, described main shaft have axis and are used for keeping the annular cutter coaxial with described axis, and this annular cutter has a plurality of teeth of being made by the cemented carbide tip that is fixed on its lower end, so that this annular cutter can cut with high rotating speed;
Reducing gear, this reducing gear is arranged between motor and the main shaft, is used for by main shaft the driving force of motor being passed to annular cutter;
Feed mechanism, in response to the operation of manual lever be used for making main shaft along its axial-movement so that the annular cutter that is installed on the main shaft advanced with respect to workpiece or bounce back; And
Adhesion base is used for electric drilling device is fixed on workpiece;
Described motor can make annular cutter with suitable high speed rotating, so that carry out the high-speed cutting operation by the annular cutter with cemented carbide tip; The axis of described main shaft along be used for driving force with motor and pass to the different direction of the direction of motor axis of rotation of reducing gear and extend.
In the embodiment of this electric drilling device, this equipment comprises that also automatic motor stops/driving mechanism again, and this mechanism comprises: main switch element, and it is connected in series between motor and the power supply; Current detector is used to detect the load current of motor of flowing through; Determining unit is used for determining whether surpass first predetermined reference value by the detected load current of current detector; And control module, be used to control the main switch element on/off, wherein, when determining unit determines that load current surpasses first reference value, control module disconnects main switch element with the flow through electric current of motor of cut-out, and when determining unit determined that load current is reduced to less than first reference value, the predetermined instant of this control module after determining connected main switch element, so that provide electric current from power supply to motor subsequently.Preferably, adhesion base comprises the magnetic bases with magnet, and/or the axis perpendicular of the rotating shaft of the axis of main shaft and motor.
In second aspect, the present invention also provides a kind of electric drilling device, and this equipment comprises:
Motor is used to make annular cutter to rotate;
Main switch element, this main switch element are connected between motor and the power supply;
Current detector is used to detect the load current of motor of flowing through;
Determining unit is used for determining whether surpass first predetermined reference value by the detected load current of current detector; And
Control module, be used to control the main switch element on/off, wherein when determining unit determines that load current surpasses first reference value, control module disconnects main switch element with the flow through electric current of motor of cut-out, and subsequently when determining unit determines that load current is reduced to less than first reference value, the predetermined instant of this control module after determining connected main switch element, so that provide electric current from power supply to motor.
In the embodiment of the electric drilling device of second aspect, this equipment also comprises main shaft, this main shaft have axis and make the annular cutter that is installed in its front end round along be used for driving force with motor and pass to the axis that the different direction of the axis of motor axis of rotation of main shaft extends and rotate.In this embodiment, preferably, the axis perpendicular of the axis of main shaft and motor axis of rotation.
In the embodiment of the electric drilling device of second aspect, annular cutter comprises by being fixed on its lower end and being fixed on respectively the cutting teeth of making facing to the carbide chip of the position of a plurality of chip areas.
In the embodiment of the electric drilling device of second aspect, this equipment also comprises: second determining unit is used for determining whether surpass second reference value littler than first reference value by the detected load current of current detector; And the loading condition indicating member, be used for when second determining unit is determined load current not above second reference value, indicating normal load condition, and when second determining unit is determined load current above second reference value, indicate overload situations.In this embodiment, preferably, current detector is the fixed resister that is connected in series with motor and main switch element, be used for exporting accordingly the voltage of corresponding acquisition on resistor with load current, and second determining unit is used for receiving the voltage corresponding with load current, and with this voltage with and corresponding second reference voltage of second reference value compare whether surpass second reference value so that determine this load current.
In the embodiment of the electric drilling device of second aspect, this current detector is the fixed resister that is connected in series with motor and main switch element, be used for exporting the voltage that on resistor obtains corresponding with load current, and first determines that device is used for receiving the voltage corresponding with load current, and, whether surpass first reference value to determine this load current with this voltage and first reference voltage comparison corresponding with first reference value.
In the embodiment of the electric drilling device of second aspect, this control module comprises: " connection " state self-sustaining unit, and it comprises first switch element, is used for when start switch first switch element remained on " connection " state; Control signal provides the unit, is used to provide " connection " control signal, so that connect main switch element when first switch element is in " connection " state; The second switch element, it is connected when first determining unit determines that load current surpasses first reference value, so that prevent that the control signal generator and first switch element are in " connection " state and irrespectively produce " connection " control signal; And to determining that by first determining unit load current is reduced to the unit that responds less than first reference value after load current surpasses first reference value, the predetermined instant that is used for after determining disconnects the second switch element.
In the embodiment of the electric drilling device of second aspect, main switch element is a TRIAC, and control module comprises: " connection " state self-sustaining unit, it comprises first switching transistor, is used for when start switch first switching transistor remained on " connection " state; Photodiode is used for when first switching transistor is in " connection " state luminous by being provided with electric current; The photoelectricity TRIAC, it be connected between the grid of TRIAC and the male or female and with the photodiode optically-coupled, thereby connect the photoelectricity TRIAC by the light that sends by photodiode, to provide gate current to TRIAC; The second switch transistor, it is used to make the electric current bypass of photodiode irrespectively to extinguish this photodiode to be in " connection " state with first switching transistor to being determined that by first determining unit load current surpasses first reference value and responds; To determining that by first determining unit load current is reduced to the unit that responds less than first reference value after load current surpasses first reference value, the predetermined instant that is used for after determining disconnects the second switch transistor.
Description of drawings
Fig. 1 is a side view, demonstrates the outward appearance of the electric drilling device with less profile according to an embodiment of the invention;
Fig. 2 is the plane at the electric drilling device shown in Fig. 1;
Fig. 3 is the cross sectional side view of this electric drilling device; And
Fig. 4 demonstrates the circuit diagram of the drill motor controller in electric drilling device according to the present invention.
The specific embodiment
Describe now with reference to Fig. 1-3 pair of electric drilling device according to an embodiment of the invention.
As shown in Figure 1, this electric drilling device comprises: main body 14, and it is provided with drill motor 12; Main shaft 18 is used for making the annular cutter t that is installed in main shaft 18 lower ends to rotate; Feed mechanism 20 is used to make annular cutter t to advance and bounces back; And electromagnetic base draws, and it remains on the bottom of main body 14 and include and is used for main body 14 is fixed on electromagnet on the steel that will hole etc.This electric drilling device also comprises the handle 42 of upper position on motor 12 that is used to drive the manual lever 39 of feed mechanism 20 and is positioned at main body 14.Motor 12 is fixed in the main body 14, makes its output shaft horizontal alignment.
As shown in Figure 2, power switch SWPW is arranged on the end face of handle 42.On the end face of handle 42, also be provided with instantaneous starting switch SWon and the shutdown switch SWoff of returning, be used for starting respectively and stopping motor 12.In addition, indicator lamp LED1, LED2 are arranged on the end face of handle 42, are used to refer to the load current condition of motor 12.As will be described in more detail later, LED1 represents that load current is normal when connecting, and LED2 represents overload (slight or severe) situation when connecting.
When operating personnel connected power switch SWPW, conduct electrical energy was given the electromagnet 53 (Fig. 4) in electromagnetic base 41, thus this electric drilling device is fixed on the workpiece.Magnetic bases 41 preferably constitute its position-adjustable with respect to main body 14.By making relative position to regulate, after magnetic bases 41 are fixed on the workpiece, can make main body 14 motions so that make annular cutter t with respect to workpiece centering.
With reference to Fig. 3, be connected the output shaft 12a of motor 12 and the reducing gear 17 between the main shaft 18 and comprise: helical gear 17a, planetary reducer 17b and spur gear 17c, 17d, 17e.This reducing gear 17 slows down the rotation of drill motor 12, and makes the rotation direction change 90 °, thereby main shaft 18 has the rotating shaft that extends along vertical direction, and this rotating shaft rotates 90 ° from the rotating shaft direction of motor 12.
Needle bearing 30 is inserted in far-end rotating shaft 26 and keeps between the cylinder 28.Lock ball (locking member) 26a is installed in the front end of far-end rotating shaft 26, is used for keeping being inserted into the annular cutter t in the front end of far-end rotating shaft 26.Also be provided with the rotary manipulation sleeve 26b that is used for operating lock ball 26a.
As shown in Figure 3, feed mechanism 20 comprises: but carry-over bar 31, and it is installed on the outer surface that keeps cylinder 28 and with the axis of main shaft 18 extends with paralleling; Stationary rack 32, but it is turned up the soil and is fixed on the main body 14 with carry-over bar 31 parallel interval; And pinion 34, it is arranged between two tooth bars 31,32 and with them and meshes.
When not carrying out drilling operation, the element of main shaft 18 remains on advanced position, as shown in Figure 3.Then, in carrying out drilling operation, when drill motor 12 rotates annular cutter t by reducing gear 17 and near-end rotating shaft 22, middle rotating shaft 24 and far-end rotating shaft 26, manipulation operations bar 39, make pinion 34 rotate thus, but and on stationary rack 32, advance downwards so that carry-over bar 31 moves downward with respect to pinion 34.Like this, middle rotating shaft 24 and far-end rotating shaft 26 are arranged on extension state, thereby main shaft 18 is entered in the extension state, make the annular cutter t that is installed in far-end rotating shaft 26 front ends advance towards workpiece.
Electric drill feeding motor can be arranged so that motor is connected with feed mechanism 20 drivings by clutch, so that main shaft 18 is extended or retraction.In this manner, can select whether to make throw-out-of clutch so that manually or automatically mobile annular cutter t.
As shown in Figure 1, a plurality of cutting teeth t2 that each all is made of cemented carbide tip are fixed on the position that faces toward chip area t1 respectively.By being fixed on by the cutting teeth t2 that cemented carbide tip constitutes on the cutting edge of annular cutter t, can under the situation that does not cause the cutting edge fragmentation, improve velocity of rotation.This is opposite with the annular cutter of being made by high-speed steel.Therefore, cutting resistance can be reduced, and cutting speed can be improved.
Therefore, as in the present invention, adopted the electric drilling device of annular cutter can improve the boring amount of feeding with cemented carbide tip; And so productivity ratio of the drilling operation that is improved.
In " How to Select and Use Tools " the 16th page (First Edition is published by Kabushiki Kaisha Taiga Shuppan), cutting speed that is applicable to the annular cutter with cemented carbide tip and the cutting speed that is applicable to the annular cutter of being made by high-speed steel have been described.
Next with reference to Fig. 4, the structure and the operation of the drill motor controller of the motor 12 that is used to drive/stop at the electric drilling device shown in Fig. 1-3 described.
In Fig. 4, Reference numeral 50 expression external AC power supplys, 51 is full-wave rectifying circuit, and 52 is the AC/DC converter.Full-wave rectifying circuit 51 imposes on electric energy the electromagnet 53 that is included in the electromagnetic base 51.When being connected power switch SWPW between external AC power supply 50 and the AC/DC converter 52 when connecting, full-wave rectifying circuit 51 will provide commutating voltage from the voltage commutation of external AC power supply 50 and to electromagnet 53, by magnetic force electric drilling device will be fixed on the target object thus.AC/DC converter 52 will become offer to be used for controlling the fixedly dc voltage (for example, 24 volts) of control module of the driving of drill motor 12 from the voltage transitions of external AC power supply 50.
TRIAC BCR is provided as the main switch element that is used to make drill motor 12 and external AC power supply 50 on/off.Photoelectricity TRIAC PHout is connected between the gate terminal and anode (or negative electrode) terminal of TRIAC BCR.Resistor (current sensing resistor) R0 and TRIAC BCR are connected in series, and are used for detecting the load current of drill motor 12 and TRIAC BCR of flowing through.
The control module that is applied with from the dc voltage of AC/DC converter 52 comprises: on circuit 71, amplifying circuit 72, smoothing circuit 73, overload determine circuit 74, stop automatically/and Drive and Control Circuit 75 and loading condition indicating circuit 76 again.
On circuit 71, according to the operation on activator switch SWON or retainer switch SW OFF or according to stopping automatically/output of Drive and Control Circuit 75 again, export the control signal that is used for TRIAC BCR on/off.
Amplifier circuit 72 will be on resistor R0 voltage amplification, and to the resulting voltage of smoothing circuit 73 outputs.This amplifier circuit 72 has little output impedance (being substantially zero), and when the voltage on resistor R0 drops to zero level, can be by the electric charge among the resistor R 73 capacitor C73 of rapid ejecting/collecting in being contained in smoothing circuit 73.This amplifier circuit 72 has and is equal to or greater than 1 gain.
Overload determines whether whether the output VL1 of circuit 74 definite smoothing circuits 73 surpasses preset reference voltage Vref 1, just operate to judge this drill motor 12 under this serious overload situations that it may be damaged.
Stop automatically/Drive and Control Circuit 75 utilizes its output to control on circuit 71 again, to determine that in overload the output VL1 of circuit 74 indicates serious overload situations (perhaps during Vref1＞VL1), automatically stop the driving of drill motor 12, and after the self-braking process scheduled time in the moment, drive drill motor 12 automatically again from the driving of drill motor 12.
Loading condition indicating circuit 76 determines whether the output VL1 of smoothing circuit 73 surpasses preset reference voltage Vref 2, to indicate the loading condition of drill motor 1 by LED1 and LED2.Than the low reference voltage Vref of determining in overload in the circuit 74 2 of reference voltage Vref 1, be set at the output counter-rotating that when drill motor 12 is transshipped a little, makes comparator OP76 and can be not impaired.LED1 (for example, blueness) connects in normal load condition, and LED2 (for example, redness) slightly or in the bigger overload situations is connecting simultaneously.Replace LED2, two LED can be set, to indicate slight and severe overload situations respectively.
In aforesaid circuit, operating personnel connect activator switch SWON, simultaneously power switch SWPW remain on " connections " state with from AC/DC converter 52 when control module applies DC and supplies voltage, the base current of the transistor Q71 of on circuit 71 flows from AC/DC converter 52 and passes activator switch SWON, make transistor Q71 connect thus, therefore, the electric current photodiode PH21N that flows through, with the photoelectric relay PH20UT of connection, be formed for the self-hold circuit of transistor Q71 thus with photodiode PH21N optical coupled.
When transistor Q71 connected, the photodiode PH1IN that electric current is also flowed through and is connected in series with transistor Q71 connected the photoelectricity TRIAC PH1OUT with photodiode PH1IN optical coupled.By connecting TRIAC BCR, AC power supplies 50 is connected with the drill motor 12 that will drive.Therefore, the rotation of drill motor 12 sends main shaft 18 to by reduction gear 17, makes annular cutter t rotate (referring to Fig. 1 and 3) thus.
In this state, at operating personnel's manual operation handle 39 (referring to Fig. 1) when driving feed mechanism 20, this annular cutter t when its rotates towards target travel, to form the through hole that therefrom passes.
When voltage reduces, detect the load current of the drill motor 12 of flowing through on current sensing resistor R0.Then, the voltage that is directly proportional with load current is amplified by amplifier circuit 72 and offers smoothing circuit 73.Because overload is determined the reference voltage Vref 1 of circuit 74 and be set at the output voltage V L1 that is higher than smoothing circuit 73 in the normal condition that drill motor 12 does not have to transship, so overload is determined comparator (operational amplifier) the OP74 output low level of circuit 74.Therefore, in normal condition, stopping automatically/charge into low-voltage on the capacitor C75 of Drive and Control Circuit 75 again, thereby the base current of transistor Q75 can not flow and therefore remain in " pass " state.
In this state, because electric current continuously flows among the photodiode PH1IN of on circuit 71 by transistor Q71, so photoelectricity TRIAC PH1OUT remains on " pass " state, allow TRIAC BCR to remain in " connection " state thus.
Be set in reference voltage Vref 2 in the loading condition indicating circuit 76 and under normal circumstances be higher than the output VL1 of smoothing circuit 73, thereby the output of comparator (operational amplifier) OP76 is in high level.Therefore, transistor Q761 and thereby LED1 connection, transistor Q762 and thereby LED2 disconnection simultaneously.From LED1 that lights and the LED2 that does not light, operating personnel can know that drill motor 12 is in the normal condition.
On the other hand, when drill motor 12 overloads, load current is increased, thereby make the voltage on current sensing resistor R0 increase, make the output VL1 of smoothing circuit 73 increase thus.When output VL1 increased to the reference voltage Vref 2 of loading condition indicating circuit 76, the output of comparator OP76 was walked around from high level and is faded to low level.This makes transistor Q761 disconnect and makes transistor Q762 connect, thereby LED1 disconnects and LED2 connects.Never the LED1 that lights and the LED2 that lights, operating personnel can determine that drill motor 12 transship a little, and so can regulate the power that is applied on the action bars 39 if desired.
When drill motor 12 further was loaded on the severe overload situations that drill motor 12 may be impaired, the overload of the output VL1 increase of smoothing circuit 73 was determined the reference voltage Vref 1 of circuit 74 or higher.At this moment, overload is determined the comparator OP74 output high level of circuit 74, this by stopping automatically/the diode D75 in the Drive and Control Circuit 75 and resistor R 751 (having less resistance) be the instantaneous charging of capacitor C75 again, thereby make the flow through base emitter of resistor R 752 and transistor Q75 of electric current.When transistor Q75 connected, the electric current of the photodiode PH1IN of the on of flowing through circuit 71 was shunted, so that therefore photoelectricity TRIAC PH1OUT is disconnected.Be reduced to it at the electric current of TRIAC BCR and keep electric current or more hour, it is disconnected the electric current that flows to drill motor 12 with cut-out.
Make at the severe overload situations to stop automatically/when Drive and Control Circuit 75 disconnects TRIAC BCR again, pressure drop in current detecting transistor R0 is reduced to zero, with the output VL1 of reduction smoothing circuit 73, thereby determine that in overload the output of the comparator OP74 in the circuit 74 is converted to low level from high level.Therefore, stopping automatically/again in the Drive and Control Circuit 75, the base current of transistor Q75 just comprises the flow through discharge current of resistor R 752 from capacitor C75.Then, base current disappeared after the time of being determined by discharge time constant, and transistor Q75 is disconnected.
In this case, still form owing to be used for the self-hold circuit of transistor Q71, so transistor Q71 remains in " connection " state by photodiode PH2IN and photorelay PH2OUT on circuit 71.Therefore, changing from the output of determining circuit 74 from overload when disconnecting after passing through the scheduled time at transistor Q75, electric current flows to photodiode PH1IN by transistor Q71 once more, make photoelectricity TRIAC PH1OUT connect once more, and finally make TRIAC BCR connect.Like this, drill motor 12 is powered once more so that rotate annular cutter t.Stop automatically/discharge time constant of Drive and Control Circuit 75 for example preferably approximately is set in 0.3 to 0.5 second the scope again.Therefore can after cutting off automatically, drill motor 12 overloads and its electric current of flowing through recover automatically at short notice to give drill motor 12 power supplies.
Also have, because the output VL1 of smoothing circuit 73 reduces when drill motor 12 is removed overload situations, so the output of the comparator OP76 in loading condition indicating circuit 76 is converted to high level from low level, LED2 disconnects thereby LED1 connects.Like this, operating personnel can have no to know mistakenly that drill motor 12 removed overload situations, and therefore can move downward to make annular cutter t once more by operating operation bar 39, so that restart to form the hole of running through object.
As mentioned above, according to electric drilling device of the present invention, have annular cutter that is fixed on the cemented carbide tip on its cutting edge and the motor that can make the annular cutter high speed rotating because adopted, so can reduce cutting resistance.Therefore, can obtain following operational benefits.
(a) reducing gear that is arranged between motor and the main shaft can be designed to adopt low moment of torsion, therefore can reduce the weight and the size of this reducing gear.
(b) this electric drilling device can be fixed on the workpiece with less attraction, thereby can reduce to include the size and the weight of the magnetic bases of the sizable volume and weight of electric drilling device, therefore obviously helps the overall dimensions of electric drilling device and the reduction of weight.
To know that from the front the present invention can be fixed on electric drilling device on the workpiece reliably, realize the size and the whole reduction of weight of equipment simultaneously.
Also have, since automatic motor stops/drive unit can cut off the electric current that flows to motor automatically in overload situations again, and after scheduled time CD-ROM drive motor again automatically, so operating personnel needn't operate the switch that is used for again CD-ROM drive motor, therefore improved service behaviour.
In addition, when drill motor is normally driven again, this situation can be informed operating personnel, thereby operating personnel can readily appreciate that he can begin the manipulation operations bar so that make the time of the downward feeding of electric drill.
In addition, owing to can improve the rotating speed of drill motor to reduce cutting resistance by the cemented carbide tip that is fixed on the cutting edge according to this small electrical rig of the present invention, so this drill motor can high speed rotating, makes operating personnel can improve the amount of feeding thus.Although motor may be provided in a side of automatic motor in the electric drilling device to stop because feeding increases and to transship/and drive unit can prevent drill motor and annular cutter because overload and impaired or destruction again.
Though electric drilling device according to the present invention is described with reference to an embodiment,, it is evident that for those of ordinary skills, can make various improvement and replacement to the present invention.
For example, can be applied to and any electric drilling device that similarly comprises the type of being arranged vertically in the small electrical rig shown in Fig. 1-3 at the control circuit shown in Fig. 4.
In addition, in this control circuit, replace photo-coupler, can adopt optional electronic switching device or mechanical relay system.Also have, replace the current sensing resistor R0 that is connected in series with drill motor 12, can adopt current transformer to detect to flow through the electric current of drill motor 12.Replace TRIAC BCR, can adopt photorelay or mechanical relay.Can adopt any time measurement mechanism, for example pulse counter to replace stopping automatically/the RC time constant circuit in the Drive and Control Circuit 75 again.In addition, drill motor 12 can be realized by the DC motor, and can adopt SCR, transistor or FET to replace TRIAC.
Though the specific embodiments according to electric drill of the present invention is described, it being understood that the explanation details that the invention is not restricted to these embodiments, but the present invention carries out extensive interpretation in its spirit and scope that proposed by claims.
Claims (12)
1. electric drilling device with less profile, this equipment comprises:
Main body;
Be installed in the motor on the main body;
Main shaft, it has axis and is used for keeping the annular cutter coaxial with described axis, and this annular cutter has a plurality of teeth of being made by the cemented carbide tip that is fixed on its lower end, so that this annular cutter is cut with high rotating speed;
Reducing gear, it is arranged between motor and the main shaft, is used for by main shaft the driving force of motor being passed to annular cutter;
Feed mechanism, it is used for making main shaft along its axial-movement in response to the operation of manual lever, so that the annular cutter that is installed on the main shaft is advanced with respect to workpiece or bounce back; And
Adhesion base, this adhesion base remains on the bottom of main body, is used for electric drilling device is fixed on workpiece;
Described motor can make annular cutter with suitable high speed rotating, so that carry out the high-speed cutting operation by the annular cutter with cemented carbide tip;
The axis of described main shaft extends along passing to the different direction of the direction of axis of motor axis of rotation of reducing gear with driving force with motor; And
Automatic motor stops/driving mechanism again, and this mechanism comprises:
Main switch element, it is connected in series between motor and the power supply;
Current detector is used to detect the load current of motor of flowing through;
Determining unit is used for determining whether surpass first predetermined reference value by the detected load current of current detector; And
Control module, be used to control the on/off of main switch element, wherein, when determining unit determines that load current surpasses first reference value, control module disconnects main switch element with the flow through electric current of motor of cut-out, and when determining unit determined that load current is reduced to less than first reference value, the predetermined instant of this control module after determining connected main switch element, so that provide electric current from power supply to motor subsequently.
2. electric drilling device as claimed in claim 1 is characterized in that described adhesion base comprises the magnetic bases with magnet.
3. electric drilling device as claimed in claim 1 is characterized in that, the axis perpendicular of the axis of described main shaft and the rotating shaft of motor.
4. electric drilling device comprises:
Motor is used to make annular cutter to rotate;
Main switch element, it is connected in series between motor and the power supply;
Current detector is used to detect the load current of motor of flowing through;
First determining unit is used for determining whether surpass first predetermined reference value by the detected load current of current detector; And
Control module, be used to control the on/off of main switch element, wherein, when determining unit determines that load current surpasses first reference value, control module disconnects main switch element with the flow through electric current of motor of cut-out, and when determining unit determined that load current is reduced to less than first reference value, the predetermined instant of this control module after determining connected main switch element, so that provide electric current from power supply to motor subsequently.
5. electric drilling device as claimed in claim 4 is characterized in that, also comprises:
Main shaft, this main shaft has axis, and the annular cutter axis that the direction different with the direction of the axis of motor axis of rotation extended round the edge that is installed in its front end is rotated.
6. electric drilling device as claimed in claim 5 is characterized in that, the axis perpendicular of the axis of described main shaft and motor axis of rotation.
7. electric drilling device as claimed in claim 4 is characterized in that, described annular cutter comprises by being fixed on its lower end and being fixed on respectively the cutting teeth of making facing to the carbide chip of the position of a plurality of chip areas.
8. electric drilling device as claimed in claim 4 is characterized in that, also comprises:
Second determining unit is used for determining whether surpass second reference value littler than first reference value by the detected load current of current detector; And
The loading condition indicating member is used for indication normal load condition when second determining unit determines that load current does not surpass second reference value, and indicates overload situations when second determining unit is determined load current above second reference value.
9. electric drilling device as claimed in claim 4, wherein:
Described current detector is the fixed resister that is connected in series with motor and main switch element, is used for exporting the voltage of on resistor the corresponding acquisition corresponding with load current; And
First determining unit is used for receiving the voltage corresponding with load current, and with this voltage with and corresponding first reference voltage of first reference value compare whether surpass first reference value so that determine this load current.
10. electric drilling device as claimed in claim 8 is characterized in that,
Described current detector is the fixed resister that is connected in series with motor and main switch element, is used for exporting the voltage that on resistor obtains corresponding with load current; And
Described second determining unit is used for receiving the voltage corresponding with load current, and with this voltage and the second reference voltage comparison corresponding with second reference value, whether surpasses second reference value to determine this load current.
11. electric drilling device as claimed in claim 4 is characterized in that, described control module comprises:
" connection " state self-sustaining unit, it comprises first switch element, is used for when start switch first switch element remained on " connection " state;
Control signal provides the unit, is used to provide " connection " control signal, so that connect main switch element when first switch element is in " connection " state;
The second switch element, it is connected when first determining unit determines that load current surpasses first reference value, so that prevent that control signal from providing the unit and first switch element to be in and irrespectively producing " connection " control signal in " connection " state; And
To determining that by first determining unit load current is reduced to the unit that responds less than first reference value after load current surpasses first reference value, the predetermined instant that is used for after determining disconnects the second switch element.
12. electric drilling device as claimed in claim 4 is characterized in that, described main switch element is a TRIAC, and control module comprises:
" connection " state self-sustaining unit, it comprises first switching transistor, is used for when start switch first switching transistor remained on " connection " state;
Photodiode is used for when first switching transistor is in " connection " state luminous by being provided electric current;
The photoelectricity TRIAC, it is connected between the grid and male or female of TRIAC, and with the photodiode optically-coupled, thereby connect the photoelectricity TRIAC by the light that sends by photodiode, to provide gate current to TRIAC;
The second switch transistor to being determined that by first determining unit load current surpasses first reference value and responds, makes the electric current bypass of photodiode, irrespectively extinguishes this photodiode to be in " connection " state with first switching transistor;
To determining that by first determining unit load current is reduced to the unit that responds less than first reference value after load current surpasses first reference value, the predetermined instant that is used for after determining disconnects the second switch transistor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP284837/2003 | 2003-08-01 | ||
| JP2003284837A JP4043420B2 (en) | 2003-08-01 | 2003-08-01 | Electric drilling device with automatic redrive function |
| JP307743/2003 | 2003-08-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1842388A CN1842388A (en) | 2006-10-04 |
| CN100411784C true CN100411784C (en) | 2008-08-20 |
Family
ID=34364656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800247687A Active CN100411784C (en) | 2003-08-01 | 2004-07-28 | Electric drilling device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4043420B2 (en) |
| CN (1) | CN100411784C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7936142B2 (en) | 2005-12-26 | 2011-05-03 | Nitto Kohki Co., Ltd. | Portable drilling device |
| JP4787768B2 (en) | 2007-02-05 | 2011-10-05 | 日東工器株式会社 | Drilling equipment |
| JP5952777B2 (en) * | 2013-05-29 | 2016-07-13 | 日東工器株式会社 | Battery drilling machine |
| CN105598503B (en) * | 2016-03-02 | 2018-03-20 | 东莞辰达电器有限公司 | Electric drill |
| CN113063998B (en) * | 2021-03-09 | 2024-03-15 | 格力博(江苏)股份有限公司 | Electric tool, electric tool load state detection circuit and detection method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4559577A (en) * | 1982-04-05 | 1985-12-17 | Nitto Kohki Co., Ltd. | Drilling machine |
| US4604006A (en) * | 1981-11-20 | 1986-08-05 | Nitto Kohki Co., Ltd. | Drilling machine having electromagnetic base |
| CN2117225U (en) * | 1992-04-15 | 1992-09-30 | 田清安 | High speed trepaning carbide drill |
| US6102632A (en) * | 1998-04-23 | 2000-08-15 | Black & Decker Inc. | Two speed right angle drill |
| JP2002046007A (en) * | 2000-08-04 | 2002-02-12 | Makita Corp | Power tool |
| CN1343153A (en) * | 1999-03-15 | 2002-04-03 | 豪根制造公司 | Self-adhering drill and cutter |
-
2003
- 2003-08-01 JP JP2003284837A patent/JP4043420B2/en not_active Expired - Fee Related
-
2004
- 2004-07-28 CN CNB2004800247687A patent/CN100411784C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4604006A (en) * | 1981-11-20 | 1986-08-05 | Nitto Kohki Co., Ltd. | Drilling machine having electromagnetic base |
| US4559577A (en) * | 1982-04-05 | 1985-12-17 | Nitto Kohki Co., Ltd. | Drilling machine |
| CN2117225U (en) * | 1992-04-15 | 1992-09-30 | 田清安 | High speed trepaning carbide drill |
| US6102632A (en) * | 1998-04-23 | 2000-08-15 | Black & Decker Inc. | Two speed right angle drill |
| CN1343153A (en) * | 1999-03-15 | 2002-04-03 | 豪根制造公司 | Self-adhering drill and cutter |
| JP2002046007A (en) * | 2000-08-04 | 2002-02-12 | Makita Corp | Power tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005052914A (en) | 2005-03-03 |
| JP4043420B2 (en) | 2008-02-06 |
| CN1842388A (en) | 2006-10-04 |
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