CN105666392A - Electric screw driver capable of automatically adjusting output torque - Google Patents
Electric screw driver capable of automatically adjusting output torque Download PDFInfo
- Publication number
- CN105666392A CN105666392A CN201511035412.XA CN201511035412A CN105666392A CN 105666392 A CN105666392 A CN 105666392A CN 201511035412 A CN201511035412 A CN 201511035412A CN 105666392 A CN105666392 A CN 105666392A
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- CN
- China
- Prior art keywords
- current
- control unit
- electric
- motor
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
Abstract
The invention relates to an electric screw driver capable of automatically adjusting output torque. A control circuit is provided with a control unit, an electronic switch, a switch, a storage unit, a current-limiting set switch, a current limiter, an electric current detection module, a voltage detection module and a motor revolution speed transducer. The size of the output torque is adjusted automatically by adjusting electric currents and voltages.
Description
Technical field
The present invention relates to a kind of electric tool, particularly to a kind of electric screw driver being automatically adjusted output moment of torsion.
Background technology
Electric screw driver is a kind of hand tools, generally has shell and the screwdriver being arranged on output shaft. It is widely used in industry and household field, is generally used for installation or removal threaded fastener, workpiece is applied moment of torsion or rotation.
Existing electric screw driver includes housing, arranges motor wherein, the position that housing grips simultaneously as operator, is equipped with screwdriver, accumulator drive motor in the front end of housing, and motor drives screwdriver to rotate by drive disk assembly. But existing electric screw driver also exists many defects, as poor in accumulator endurance quality, it is often necessary to maintaining, in work process, motor oscillating is violent, the serious muscle power expending operator, during fastening, motor screwdriver easily blocks so that motor exists overload and causes the danger of motor damage.
Summary of the invention
Based on above-mentioned deficiency, the present invention conducts in-depth research, and develops a kind of electric screw driver being automatically adjusted output moment of torsion.
One aspect of the present invention provides a kind of electric screw driver being automatically adjusted output moment of torsion, there is housing, hands handle, in described housing, motor is installed, the front end of described housing is provided with output shaft, described output shaft is connected by drive mechanism with described motor, the front end of described output shaft is provided with driver bit jack, the driver bit of different model can be installed in described driver bit jack, it is provided with control unit in described handle, for the transmission/reception that signal sends/receives, memory element, charging socket, the switch being attached by described control unit with described motor, the charging socket being connected with the accumulator battery below described handle, described handle is arranged below accumulator battery, by electric motor starting and stopping described in described on-off control, it is connected with extraneous power supply by described charging socket, control circuit has control unit, electrical switch, switch, memory element, current limliting configuration switch, current limiter, current detection module, voltage detection module, motor speed sensor, in described memory element, storage has rotating speed predetermined value N1, described current detection module detection current of electric, described voltage detection module detects the output voltage of described accumulator battery, described control unit calculates the magnitude of voltage needed for maintenance rotating speed predetermined maximum N1 and current value according to the current of electric of described motor speed predetermined maximum N1 and detecting, described voltage detection module detects the virtual voltage of described motor in real time, described control unit regulates the driving signal of output according to the virtual voltage of detection and the difference of reference voltage, thus maintaining motor speed.
Another aspect of the present invention provides a kind of electric screw driver being automatically adjusted output moment of torsion, and described driving signal is pulse-width signal, if the virtual voltage of described motor exceedes reference voltage, described control unit reduces the dutycycle of described driving signal; If the virtual voltage of described motor is less than reference voltage, described control unit increases the dutycycle driving signal.
Another aspect of the present invention provides a kind of electric screw driver being automatically adjusted output moment of torsion, signal according to described motor speed sensor, if motor speed is less than rotating speed predetermined maximum N1, described control unit detects current of electric in real time by described current detection module, and by the current value ratio of the current of electric of detecting and the current value of calculating needs and the setting of current limliting configuration switch relatively, higher value in the current value making current limiter adjustment current of electric be current value and the current limliting configuration switch setting calculating needs, and the higher value of this current value can not more than the current threshold stored in advance in memory element, if motor speed is more than rotating speed predetermined maximum N1, described control unit detects current of electric in real time by described current detection module, and by detecting current of electric with calculate need current value and current limliting configuration switch set current value ratio relatively so that current limiter regulate current of electric be calculate need current value and current limliting configuration switch set current value in smaller value.
Another aspect of the present invention provides a kind of electric screw driver being automatically adjusted output moment of torsion; if motor speed sensor is sent to the signal value sudden change of control unit; described control unit judges with the change of current/voltage parameter in previous setting interval according in current time interval; described control unit judges that electric screw driver is stuck; control described motor stopping, it is prevented that motor is burned out.
Accompanying drawing explanation
Accompanying drawing 1 is the overall system structure schematic diagram of electric screw driver of the present invention.
Accompanying drawing 2 is the structural representation of the drive mechanism of electric screw driver of the present invention.
Accompanying drawing 3 is the structural representation of the control circuit of electric screw driver of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described, but does not limit the invention to these detailed description of the invention. One skilled in the art would recognize that and present invention encompasses all alternatives, improvement project and the equivalents potentially included in Claims scope.
Embodiment 1
As shown in Figure 1, the present invention provides a kind of electric screw driver, there is housing 1, handle 2, motor 3 is installed in housing 1, housing 1 front end is provided with output shaft 12, output shaft 12 is connected by drive mechanism 4 with motor 3, and the front end of output shaft 12 is provided with driver bit jack, can install the driver bit 16 of different model in driver bit jack.
Control unit 19 it is provided with in handle 2, for the transmission/reception 50 that signal sends/receives, memory element 51, charging socket 52, with the switch 17 that motor 3 is attached by control unit 19, the charging socket 42 being connected with the accumulator battery 18 below handle 2, handle 2 is arranged below accumulator battery 18, start by switching 17 control motors 3 and stop, being connected with extraneous power supply by charging socket 12, it is possible to accumulator battery 18 is charged.
As shown in Figure 2, described drive mechanism 4 includes: be arranged on the ring gear 6 of motor 3 front end, the teeth portion of ring gear 6 is arranged on the internal ring place of annular, the inside of ring gear 6 is provided with pinion frame 26 near one end, front of electric screw driver, by the transmission of some planetary gears 28 between ring gear 6 and pinion frame 26, output shaft 12 is connected with pinion frame 26, when motor 3 drives ring gear 6 to rotate, drive the rotation of planetary gear 28 and pinion frame 26 so that output shaft 12 synchronous axial system.
The front end of housing 1 is provided with adjusting ring 11, threaded collar 22 it is provided with in adjusting ring 11, the front end face of ring gear 6 is that the moment of torsion that height rises and falls regulates face, it is provided with in housing 1 and regulates, with moment of torsion, the spin 27 that face abuts, spin and latch 25 abut against, the front end of latch 25 is provided with check plate 24, spiral support spring 21 it is provided with between check plate 24 and threaded collar 22, by rotating adjusting ring 11 actuating thread ring 22, helical spring 21 is made to be compressed or extend, so that the pressure between the moment of torsion adjustment face of spin 27 and ring gear 6 increases or reduces, spin 27 becomes the ladder being difficult to or easily crossing between moment of torsion adjustment face, can adjust between different outputting torsions thus reaching mechanical adjustment driver bit. when needing bigger outputting torsion, regulate adjusting ring 11 and threaded collar is forwards moved, when needing less outputting torsion, regulate adjusting ring 11 and threaded collar 22 is rearward moved.
The rear end of output shaft 12 is also equipped with stop pin 23, the sidewall of stop pin 23 arranges groove, pinion frame 26 is provided with the projection coordinated with stop pin 23 upper groove, has locking circle 8 outside stop pin, the space between locking circle 8 and stop pin 23 arranges self-locking block 7, when motor 3 quits work, stop pin 23, pinion frame 26, automatically lock between self-locking block 7 three, thus output shaft cannot rotate, it is possible to use as normal screws cutter.
Embodiment 2
On the basis of embodiment 1, as shown in Figure 1, the electric screw driver of the present invention has control unit 19, the signal input control unit 19 that switch 17 will be turned on and off, there is memory element 51 simultaneously, memory element 51 stores electric screw driver and runs relevant data, and have authorize in advance information or data, control unit 19 can read from memory element 51 and be stored in data.
Have one external, by the key 150 of the operator with legal authorization, this key 150 schematically represents in the accompanying drawings, and this key 150 has transmission/reception, and preferably there is wireless and remote action interface, such as typical optical infrared interface or radio. Being communicated by the transmission/reception 50 of above-mentioned interface Yu electric screw driver, the transmission/reception 50 of electric screw driver is connected with control unit 19.
Control unit 19 is when pre-conditioned or default interval, by the transmission/reception 50 of electric screw driver, the authorization code request signal of storage in memory element 51 is sent, the transmission/reception of external key 150 is activated after receiving authorization code request signal, mode of operation is converted to from sleep pattern, then the transmission/reception of external key sends the authorization code signal preset to the transmission/reception 50 of electric screw driver, this authorization code signal is sent to control unit 19, compare with the presupposed information being stored in memory element 51, if authorization code signal is correct, then the signal that is turned on and off of switch 17 is normally transmitted by control unit 19 to motor 3, if authorization code signal is incorrect or is not received by authorization code signal, the signal that then control unit 19 roof-cut resistence 17 transmits to motor 3, electric screw driver is kept to be in blocking.
So cannot be carried out normal operating when electric screw driver is stolen, or when being used by the operator of with no authorized, during as held by child, maloperation will not be produced.
Embodiment 3
On the basis of embodiment 1 and 2, in order to accurately regulate the torque output of electric screw driver further, the control circuit of the electric screw driver of the present invention is optimized further.
As it is shown on figure 3, control circuit 70 has control unit 19, electrical switch 171, switch 17, memory element 50, current limliting configuration switch 508, current limiter 503, current detection module 505, voltage detection module 501, motor speed sensor 502.
Motor 3 is connected with accumulator battery 18 with by electrical switch 171, and electrical switch 171 passes through current limiter 503 in being connected with control unit 19.
Owing to motor speed N is relevant with electric moter voltage and current of electric I, and when load increases, current of electric I also increases accordingly, if motor speed N need to be maintained, then needs to increase corresponding electric moter voltage. Therefore can obtain motor speed N according to the current of electric I of detecting and electric moter voltage, and the electric current setting current limiter 503 by regulating current limliting configuration switch 508 to regulate is by being worth, and sets motor speed predetermined maximum N1.
In memory element 50, storage has rotating speed predetermined value N1, current detection module 505 detects current of electric, and voltage detection module 501 detects the output voltage of accumulator battery, control unit 19 and calculates the magnitude of voltage needed for maintenance rotating speed predetermined maximum N1 and current value according to the current of electric of motor speed predetermined maximum N1 and detecting. Control unit 19 is with calculated magnitude of voltage for reference voltage. Voltage detection module 501 detects the virtual voltage of motor 3 in real time, and control unit 19 regulates the driving signal of output according to the virtual voltage of detection and the difference of reference voltage, thus maintaining motor speed.
Driving signal is pulse-width signal, if the virtual voltage of motor 3 exceedes reference voltage, control unit 19 reduces the dutycycle driving signal; If the virtual voltage of motor 3 is less than reference voltage, control unit 19 increases the dutycycle driving signal.
Signal according to motor speed sensor 502, if motor speed is less than rotating speed predetermined maximum N1, control unit 19 detects current of electric in real time by current detection module 505, and by the current of electric of detecting with calculate the current value needed and the current value ratio that sets of current limliting configuration switch 508 relatively, making current limiter 503 regulate current of electric is calculate the current value needed and higher value in current value that current limliting configuration switch 508 sets, and the higher value of this current value can not more than the current threshold stored in advance in memory element 50. If motor speed is more than rotating speed predetermined maximum N1, control unit 19 detects current of electric in real time by current detection module 505, and by the current of electric of detecting with calculate the current value needed and the current value ratio that sets of current limliting configuration switch 508 relatively so that it is calculate the current value needed and smaller value in current value that current limliting configuration switch 508 sets that current limiter 503 regulates current of electric. If motor speed sensor 502 is sent to the signal value sudden change of control unit; control unit 19 judges with the change of current/voltage parameter in previous setting interval according in current time interval; such as 1s or the 3s time; the motor speed of motor speed sensor 502 detection reduces to 0; and current detection module 505, voltage detection module 501 still detect that signal exports; then control unit 19 judges that electric screw driver is stuck, and controls motor 3 and shuts down, it is prevented that motor is burned out.
Above-mentioned specific embodiment is schematically illustrating present invention, does not represent the restriction to present invention. It may occur to persons skilled in the art that, in the present invention, electric screw driver concrete structure can have a lot of versions, but the technical characteristics of the used technical solution is same or similar with the present invention, all should be covered by scope.
Claims (4)
1. the electric screw driver that can be automatically adjusted output moment of torsion, there is housing, hands handle, in described housing, motor is installed, the front end of described housing is provided with output shaft, described output shaft is connected by drive mechanism with described motor, the front end of described output shaft is provided with driver bit jack, the driver bit of different model can be installed in described driver bit jack, it is provided with control unit in described handle, for the transmission/reception that signal sends/receives, memory element, charging socket, the switch being attached by described control unit with described motor, the charging socket being connected with the accumulator battery below described handle, described handle is arranged below accumulator battery, by electric motor starting and stopping described in described on-off control, it is connected with extraneous power supply by described charging socket, control circuit has control unit, electrical switch, switch, memory element, current limliting configuration switch, current limiter, current detection module, voltage detection module, motor speed sensor, it is characterized in that:
In described memory element, storage has rotating speed predetermined value N1, described current detection module detection current of electric, described voltage detection module detects the output voltage of described accumulator battery, described control unit calculates the magnitude of voltage needed for maintenance rotating speed predetermined maximum N1 and current value according to the current of electric of described motor speed predetermined maximum N1 and detecting
Described voltage detection module detects the virtual voltage of described motor in real time, and described control unit regulates the driving signal of output according to the virtual voltage of detection and the difference of reference voltage, thus maintaining motor speed.
2. as claimed in claim 1 a kind of be automatically adjusted output moment of torsion electric screw driver, it is characterized in that: described driving signal is pulse-width signal, if the virtual voltage of described motor exceedes reference voltage, described control unit reduces the dutycycle of described driving signal; If the virtual voltage of described motor is less than reference voltage, described control unit increases the dutycycle driving signal.
3. as claimed in claim 2 a kind of be automatically adjusted output moment of torsion electric screw driver, it is characterised in that:
Signal according to described motor speed sensor, if motor speed is less than rotating speed predetermined maximum N1, described control unit detects current of electric in real time by described current detection module, and by the current value ratio of the current of electric of detecting and the current value of calculating needs and the setting of current limliting configuration switch relatively, higher value in the current value making current limiter adjustment current of electric be current value and the current limliting configuration switch setting calculating needs, and the higher value of this current value can not more than the current threshold stored in advance in memory element;
If motor speed is more than rotating speed predetermined maximum N1, described control unit detects current of electric in real time by described current detection module, and by detecting current of electric with calculate need current value and current limliting configuration switch set current value ratio relatively so that current limiter regulate current of electric be calculate need current value and current limliting configuration switch set current value in smaller value.
4. as claimed in claim 3 a kind of be automatically adjusted output moment of torsion electric screw driver, it is characterised in that:
If motor speed sensor is sent to the signal value sudden change of control unit; described control unit judges with the change of current/voltage parameter in previous setting interval according in current time interval; described control unit judges that electric screw driver is stuck; control described motor stopping, it is prevented that motor is burned out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511035412.XA CN105666392B (en) | 2015-12-31 | 2015-12-31 | A kind of electric screw driver automatically adjusting output torque |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511035412.XA CN105666392B (en) | 2015-12-31 | 2015-12-31 | A kind of electric screw driver automatically adjusting output torque |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105666392A true CN105666392A (en) | 2016-06-15 |
| CN105666392B CN105666392B (en) | 2019-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511035412.XA Active CN105666392B (en) | 2015-12-31 | 2015-12-31 | A kind of electric screw driver automatically adjusting output torque |
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| Country | Link |
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| CN (1) | CN105666392B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107877457A (en) * | 2016-09-30 | 2018-04-06 | 罗伯特·博世有限公司 | Hand held power machine |
| CN109286351A (en) * | 2018-11-15 | 2019-01-29 | 江苏开璇智能科技有限公司 | A kind of current limliting automatic adjustment device for motor |
| US11689124B2 (en) | 2021-01-12 | 2023-06-27 | Snap-On Incorporated | Controlling brushless motor commutation |
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| US4885511A (en) * | 1986-04-11 | 1989-12-05 | Hilti Aktiengesellschaft | Drive control with overload protection for a drill device |
| CN1520022A (en) * | 2002-12-11 | 2004-08-11 | ������������ʽ���� | Rotational speed controller |
| CN101231507A (en) * | 2008-01-15 | 2008-07-30 | 中国端子电业股份有限公司 | Power tool capable of learning by oneself |
| CN101305404A (en) * | 2005-11-18 | 2008-11-12 | 梅塔波沃克有限公司 | Hand-held electric tool and battery set for the same |
| CN201940944U (en) * | 2011-01-25 | 2011-08-24 | 慈溪市宏冠电动工具有限公司 | Rotating type electric screw driver |
| CN103368480A (en) * | 2012-03-31 | 2013-10-23 | 苏州宝时得电动工具有限公司 | Handheld electric-driven tool and control method thereof |
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2015
- 2015-12-31 CN CN201511035412.XA patent/CN105666392B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4885511A (en) * | 1986-04-11 | 1989-12-05 | Hilti Aktiengesellschaft | Drive control with overload protection for a drill device |
| CN1520022A (en) * | 2002-12-11 | 2004-08-11 | ������������ʽ���� | Rotational speed controller |
| CN101305404A (en) * | 2005-11-18 | 2008-11-12 | 梅塔波沃克有限公司 | Hand-held electric tool and battery set for the same |
| CN101231507A (en) * | 2008-01-15 | 2008-07-30 | 中国端子电业股份有限公司 | Power tool capable of learning by oneself |
| CN201940944U (en) * | 2011-01-25 | 2011-08-24 | 慈溪市宏冠电动工具有限公司 | Rotating type electric screw driver |
| CN103368480A (en) * | 2012-03-31 | 2013-10-23 | 苏州宝时得电动工具有限公司 | Handheld electric-driven tool and control method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107877457A (en) * | 2016-09-30 | 2018-04-06 | 罗伯特·博世有限公司 | Hand held power machine |
| CN109286351A (en) * | 2018-11-15 | 2019-01-29 | 江苏开璇智能科技有限公司 | A kind of current limliting automatic adjustment device for motor |
| US11689124B2 (en) | 2021-01-12 | 2023-06-27 | Snap-On Incorporated | Controlling brushless motor commutation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105666392B (en) | 2019-03-08 |
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Effective date of registration: 20191223 Address after: No.269, Ganjing Road, LindaI Town, Pinghu City, Jiaxing City, Zhejiang Province Patentee after: Pinghu Yongjin Machinery Co., Ltd Address before: 315202 Gu Gu industrial zone, Jiulong Town, Zhenhai District, Zhejiang, Ningbo Patentee before: NINGBO ZHONGWANG TOOLS CO., LTD. |