CN100446933C - Structure of electric screwdriver arrested by non-contact electromagnetic induction - Google Patents
Structure of electric screwdriver arrested by non-contact electromagnetic induction Download PDFInfo
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- CN100446933C CN100446933C CNB2007100221733A CN200710022173A CN100446933C CN 100446933 C CN100446933 C CN 100446933C CN B2007100221733 A CNB2007100221733 A CN B2007100221733A CN 200710022173 A CN200710022173 A CN 200710022173A CN 100446933 C CN100446933 C CN 100446933C
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- electromagnetic induction
- magnet assembly
- moving spring
- sensor
- cavity
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Abstract
A non-contact electric screwdriver able to be braked by electromagnetic induction is composed of shell, intermediate sleeve, power drive unit with motor and its drive circuit, and an electromagnetic induction brake unit with a signal output connected to the input of said motor drive circuit.
Description
Technical field
The invention belongs to the technical field of electric tool, in particular to a kind of improvement of arrestment mechanism of electric screw driver, this kind electric screw driver utilizes the sensor displacement detecting mechanism to realize the contactless electromagnetic induction braking of electric screw driver.
Background technology
Chinese patent CN2815620Y discloses the electric screwdriver structure (this patent is proposed to Patent Office on August 10th, 2005 by the applicant) that a kind of contactless electromagnetic induction starts, it is that Starting mode with the lever of known electric screw driver or push-press type is the closed of mechanical switch contact or disconnects the action of controlling electric screw driver and whether change contactless electromagnetic induction into and start whether embody action, and known electric screwdriver structure complexity, life-span are short, the deficiency of poor reliability thereby overcome.Specifically, lever starting drive 1 and push-press type starting drive 2 are changed into first magnetic part 11, the first Hall integrated circuit device 12 and changed into second magnetic part 21, second Hall integrated circuit 22 by original mechanical contact microswitch respectively by shown in Figure 4.
The action principle of lever starting drive 1 is: when operator's started by press lever, start lever drives and be installed in the first interior magnetic part 11 of lever, the magnetic pole that makes first magnetic part 11 is near the first Hall integrated circuit device 12, after the magnetic field of first magnetic part 11 is detected by the first Hall integrated circuit device 12, the first Hall integrated circuit device, 12 output level reverse signals, this signal is transported to the input of motor-drive circuit, is carried out the Starting mode switching and control motor-driven motor is rotated by the microprocessor in the drive circuit; Otherwise, when unclamping the startup lever, electronic stopping operating.
The action principle of push-press type starting drive 2 is: when the pushing screwdriver, driver bit drives second magnetic part 21 that is installed on the output shaft, the magnetic pole that makes second magnetic part 21 is near the second Hall integrated circuit device 22, after the magnetic field of second magnetic part 21 is detected by the second Hall integrated circuit device 22, the second Hall integrated circuit device, 22 output level reverse signals, this signal is transported to microprocessor, by microprocessor control motor driver motor is rotated; Otherwise, when removing the pushing screwdriver, electronic stopping operating.
Said structure has realized that by the sensor displacement detecting mechanism the contactless electromagnetic induction of electric screw driver starts, and compares the achievement part with essence with traditional mechanical contact switch.But above-mentioned patented technology scheme still has weak point, has neglected the brake structure of electric screw driver.Still by shown in Figure 4, take on the microswitch that is still mechanical contact of brake apparatus 3 employings of braking action, the brake of controlling electric screw driver with the closed or disconnection of mechanical switch contact is a braking maneuver.Known to the industry, the operating distance that is applied in the microswitch on this electric tool is smaller, that is to say that actuating length is less, about the 1.5-2.1mm scope, so require very harsh to processing, the installation accuracy of microswitch.But even if machining accuracy, installation accuracy have reached impeccable degree, yet because the design feature of microswitch self still can have influence on service life.Because, the contact of microswitch (button) is subjected to repeated stock, inner reed fatigue and even fracture very easily occur through perseveration, or cause brake fade or cause the output torque instability, on quite high occasion of frequency of utilization (number of times) such as assembling line, use, reached thousand and tens of thousands time action in one day, thereby probability of failure is very high.
Why prior art has carried out structural improvement to lever starting drive 1 and driving device 2 and brake apparatus 3 has not been reformed, be actually by due to the technology prejudice, the effect, the efficient that it has been generally acknowledged that braking can not constitute too big trouble to electric screw driver, even even not think and brake that starting the back nature in cut off the electricity supply back or disconnection so can quit work; Think that also changing brake apparatus 3 comes conveniently than changing starting drive; If it is brake apparatus 3 is replaced with contactless electromagnetic induction braking device, comparatively thorny for the reset issues of magnetic part so.Just be based on above-mentioned prejudice, both caused to be complementary with the service life (lever starting drive 1 after the improvement and push-press type starting drive 2) of starting drive the service life of brake apparatus 3, also caused complicated integral structure, the parts processing request height of electric screw driver, the reason of poor reliability.
Summary of the invention
Task of the present invention be to provide a kind of be intended to overcome above-mentioned prejudice and help further to simplify electric screw driver integrally-built, make itself and starting drive service life contactless electromagnetic induction braking that be tending towards mating, that reliability is desirable electric screwdriver structure.
Task of the present invention is finished like this, a kind of electric screwdriver structure of contactless electromagnetic induction braking, it comprises shell, intermediate sleeve, actuating unit and starting drive and brake apparatus, described brake apparatus is the electromagnetic induction braking device, and the signal output part of this electromagnetic induction braking device is electrically connected with the input of the motor-drive circuit of the motor of described actuating unit.
Electromagnetic induction braking device of the present invention comprises electromagnetic sensor, the signal amplification driving circuit, magnet assembly and be used to the back-moving spring that ensures that magnet assembly resets, the input of described signal amplification driving circuit is electrically connected with the output of electromagnetic sensor, the output of signal amplification driving circuit then is electrically connected with the input of motor-drive circuit, wherein: electromagnetic sensor, magnet assembly and back-moving spring place in the cavity of being offered on the described intermediate sleeve, one end of magnet assembly contacts with transmission bowl on the output shaft that is located at described actuating unit, one end in contact of the other end and back-moving spring, the other end of back-moving spring is bearing on the roof of described cavity, and the chamber wall of electromagnetic sensor and cavity is fixed, and corresponding with magnet assembly.
Electromagnetic induction braking device of the present invention comprises electromagnetic sensor, the signal amplification driving circuit is at interior IC-components, magnet assembly and one is used to the back-moving spring that ensures that described magnet assembly resets, the output of IC-components is electrically connected with the input of described motor-drive circuit, wherein: IC-components, magnet assembly and back-moving spring place in the cavity of being offered on the described intermediate sleeve, one end of magnet assembly be nested with action on the conical disc of described actuating unit and detect cover and contact, one end in contact of the other end and back-moving spring, the other end of back-moving spring is bearing on the roof of described cavity, and the chamber wall of IC-components and cavity is fixed, and corresponding with magnet assembly.
Electromagnetic sensor of the present invention is any one in Hall element, the huge Magnetic Sensor.
Hall element of the present invention is any one in Hall switch sensor, the linear hall sensor.
The brake apparatus that the present invention becomes in the prior art adopts mechanical microswitch structure into adopting magnet positions sensing detection structure, by electromagnetic sensor or the IC-components collection signal that magnet assembly sent, so signals collecting precision height, reliable in action are ensured; Can fully satisfy the requirement that is complementary with the life-span that is similarly the starting drive of non-contact type aspect service life; Can improve the integrally-built simplification effect of electric screw driver.
Description of drawings
Fig. 1 is an example structure figure of electric screw driver of the present invention.
Fig. 2 is the partial enlarged drawing of Fig. 1.
Fig. 3 is the braking principle block diagram of the brake apparatus of electric screw driver of the present invention.
Fig. 4 is the schematic diagram of the brake apparatus of the electric screw driver in the prior art.
The specific embodiment
By following description, will be expressly understood technical spirit of the present invention more, and make advantage of the present invention and effect more become bright and clear, yet, should not look embodiment and be restriction the present invention program.
Ask for an interview Fig. 1 and Fig. 2 and Fig. 3, for example identical as electric screw driver with aforementioned CN2851620Y with prior art, also include a shell 6, and this shell 6 is molded from plastic into shape usually, be installed in the shell chamber of shell 6 and preferable material be the intermediate sleeve 4 of metal such as aluminium alloy system, be installed with actuating unit 5 in the mantle cavity of intermediate sleeve 4, this actuating unit 5 comprises motor 51, deceleration assembly 52, jackshaft 53, transmission bowl 54, camshaft 55, conical disc 56 at least.Constitute the part of a disappearance at the outer wall of intermediate sleeve 4, constitute the cavity 41 of arrangement as the brake apparatus 3 of electric screw driver by the part of this disappearance.
The brake apparatus 3 that the present invention recommended is the electromagnetic induction braking device, and by shown in Figure 3, the signal output part of this electromagnetic induction braking device is electrically connected with the input of the motor-drive circuit 511 of the motor 51 of actuating unit 5.
As a kind of embodiment, the electromagnetic induction braking device comprises the 3rd Hall integrated circuit device 32, signal amplification driving circuit, magnet assembly 31 and back-moving spring 33, for the 3rd Hall integrated circuit device 32 both can be electromagnetic sensor, it also can be the IC-components that comprises the signal amplification driving circuit, and electromagnetic sensor both can be a Hall element, it also can be huge Magnetic Sensor, and then ground, Hall element both can be the switching mode sensor, also can be linear hall sensor.
Please see Fig. 1, Fig. 2 for details, as brake apparatus 3, say that further the magnet assembly 31 as electromagnetic induction device is arranged in the cavity of being offered on the above-mentioned intermediate sleeve 4 41, the lower surface of this magnet assembly 31 is and is nested with action on conical disc 56 and detects cover 561 and contact, and the following end in contact of the upper surface of magnet assembly 31 and back-moving spring 33, the last end bearing of back-moving spring or title are kept out on the roof of cavity 41; The 3rd Hall integrated circuit device 32 as electromagnetic induction device is fixed with the chamber wall of described cavity 41, and corresponding with magnet assembly 31.
Please continue to see Fig. 2 and Fig. 3, when the output torque of electric screw driver reaches setting value, the steel ball 541 that is driven by the transmission bowl 54 of actuating unit 5 makes conical disc 56 and action detect cover 561 and produces a downward axial displacement action, be adsorbed on action this moment and detect the axial displacement downwards together of the magnet assembly 31 of cover on 561, ask for an interview the applicant and be labeled in arrow on the magnet assembly shown in Figure 2 31.Because magnet assembly 31 produces change in displacement with respect to the 3rd Hall integrated circuit device 32 of stationary, it is changed by the magnetic field intensity that the 3rd Hall integrated circuit device 32 is detected, produce actuating signal, this signal sends to the input of motor-drive circuit 511 after the signal amplification driving circuit amplifies, motor 51 is quit work, i.e. braking or title brake.
Defined in the above the 3rd Hall integrated circuit device 32 of the present invention is based on electric screw driver and disposes by the lever starting drive of first magnetic part 11, the first Hall integrated circuit device 12 and/or the push-press type starting drive that disposes by second magnetic part 21, the second Hall integrated circuit device 22 and define.
By above-mentioned explanation, what can know fully that the structure of the brake apparatus 3 that the present invention recommends adopts is contactless electromagnetic induction braking structure, compare with the microswitch of the mechanical contact of prior art, the reliability of its action should be ultimate attainment, and the service life that helps improving brake apparatus 3, therefore finished task of the present invention.
Claims (5)
1, a kind of electric screwdriver structure of contactless electromagnetic induction braking, it comprises shell, intermediate sleeve, actuating unit and starting drive and brake apparatus, it is characterized in that described brake apparatus is the electromagnetic induction braking device, the signal output part of this electromagnetic induction braking device is electrically connected with the input of the motor-drive circuit of the motor of described actuating unit.
2, the electric screwdriver structure of contactless electromagnetic induction braking according to claim 1, it is characterized in that described electromagnetic induction braking device comprises electromagnetic sensor, the signal amplification driving circuit, magnet assembly and be used to the back-moving spring that ensures that magnet assembly resets, the input of described signal amplification driving circuit is electrically connected with the output of electromagnetic sensor, the output of signal amplification driving circuit then is electrically connected with the input of motor-drive circuit, wherein: electromagnetic sensor, magnet assembly and back-moving spring place in the cavity of being offered on the described intermediate sleeve, one end of magnet assembly contacts with transmission bowl on the output shaft that is located at described actuating unit, one end in contact of the other end and back-moving spring, the other end of back-moving spring is bearing on the roof of described cavity, and the chamber wall of electromagnetic sensor and cavity is fixed, and corresponding with magnet assembly.
3, the electric screwdriver structure of contactless electromagnetic induction braking according to claim 1, it is characterized in that described electromagnetic induction braking device comprises electromagnetic sensor, the signal amplification driving circuit is at interior IC-components, magnet assembly and one is used to the back-moving spring that ensures that described magnet assembly resets, the output of IC-components is electrically connected with the input of described motor-drive circuit, wherein: IC-components, magnet assembly and back-moving spring place in the cavity of being offered on the described intermediate sleeve, one end of magnet assembly be nested with action on the conical disc of described actuating unit and detect cover and contact, one end in contact of the other end and back-moving spring, the other end of back-moving spring is bearing on the roof of described cavity, and the chamber wall of IC-components and cavity is fixed, and corresponding with magnet assembly.
4, the electric screwdriver structure of contactless electromagnetic induction braking according to claim 2 is characterized in that described electromagnetic sensor is any one in Hall element, the huge Magnetic Sensor.
5, the electric screwdriver structure of contactless electromagnetic induction braking according to claim 4 is characterized in that described Hall element is any one in Hall switch sensor, the linear hall sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100221733A CN100446933C (en) | 2007-05-06 | 2007-05-06 | Structure of electric screwdriver arrested by non-contact electromagnetic induction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100221733A CN100446933C (en) | 2007-05-06 | 2007-05-06 | Structure of electric screwdriver arrested by non-contact electromagnetic induction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101049686A CN101049686A (en) | 2007-10-10 |
| CN100446933C true CN100446933C (en) | 2008-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100221733A Expired - Fee Related CN100446933C (en) | 2007-05-06 | 2007-05-06 | Structure of electric screwdriver arrested by non-contact electromagnetic induction |
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| Country | Link |
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| CN (1) | CN100446933C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6543549B1 (en) * | 1999-05-28 | 2003-04-08 | Hilti Aktiengesellschaft | Electrically driven hand-held tool |
| CN1467055A (en) * | 2002-06-21 | 2004-01-14 | ���ء����߸� | Hand-held machine tool with device for clockwise and anti-clockwise commutation of an electromotor |
| CN1579819A (en) * | 2004-05-20 | 2005-02-16 | 宁波五元电动工具有限公司 | Automobile wrench |
| CN2815620Y (en) * | 2005-08-10 | 2006-09-13 | 常熟市东联电器制造有限责任公司 | Electric screw driver structure for contactless electromagnetic induction start |
| CN201049448Y (en) * | 2007-05-25 | 2008-04-23 | 常熟市东联电器制造有限责任公司 | Contact point free electromagnetic induction brake electric screwdriver structure |
-
2007
- 2007-05-06 CN CNB2007100221733A patent/CN100446933C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6543549B1 (en) * | 1999-05-28 | 2003-04-08 | Hilti Aktiengesellschaft | Electrically driven hand-held tool |
| CN1467055A (en) * | 2002-06-21 | 2004-01-14 | ���ء����߸� | Hand-held machine tool with device for clockwise and anti-clockwise commutation of an electromotor |
| CN1579819A (en) * | 2004-05-20 | 2005-02-16 | 宁波五元电动工具有限公司 | Automobile wrench |
| CN2815620Y (en) * | 2005-08-10 | 2006-09-13 | 常熟市东联电器制造有限责任公司 | Electric screw driver structure for contactless electromagnetic induction start |
| CN201049448Y (en) * | 2007-05-25 | 2008-04-23 | 常熟市东联电器制造有限责任公司 | Contact point free electromagnetic induction brake electric screwdriver structure |
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| Publication number | Publication date |
|---|---|
| CN101049686A (en) | 2007-10-10 |
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Granted publication date: 20081231 Termination date: 20110506 |