CN115805568B - An impact power tool - Google Patents
An impact power tool Download PDFInfo
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- CN115805568B CN115805568B CN202211465860.3A CN202211465860A CN115805568B CN 115805568 B CN115805568 B CN 115805568B CN 202211465860 A CN202211465860 A CN 202211465860A CN 115805568 B CN115805568 B CN 115805568B
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Abstract
本发明公开了一种冲击电动工具，包括：驱动电机旋转的驱动模块、打击检测部及控制器，控制器包括校正参数生成部及连接于校正参数生成部的补偿确认部，打击检测部连接于补偿确认部，且将单次有效打击次数及实际总打击次数发送至补偿确认部，校正参数生成部存储有总打击数与扭力值之间的衰减关系曲线，补偿确认部根据实际总打击次数及衰减关系曲线以确认补偿打击数，并控制电机驱动以进行补偿。本发明通过设定衰减关系曲线及补偿打击数，能够实现长期使用后对其进行有效补偿，以实现定扭矩输出，控制简单，成本低。
The present invention discloses an impact power tool, comprising: a driving module for driving a motor to rotate, a striking detection unit and a controller, the controller comprising a correction parameter generating unit and a compensation confirmation unit connected to the correction parameter generating unit, the striking detection unit is connected to the compensation confirmation unit, and the single effective striking number and the actual total striking number are sent to the compensation confirmation unit, the correction parameter generating unit stores an attenuation relationship curve between the total striking number and the torque value, the compensation confirmation unit confirms the compensation striking number according to the actual total striking number and the attenuation relationship curve, and controls the motor drive to compensate. The present invention can achieve effective compensation after long-term use by setting the attenuation relationship curve and the compensation striking number, so as to achieve a constant torque output, and the control is simple and the cost is low.
Description
[ Field of technology ]
The present invention relates to an electric tool, and more particularly, to an impact electric tool capable of achieving constant torque output.
[ Background Art ]
The existing impact electric tools all have a fixed torque function, so that the tools can realize fixed torque output, however, most of the fixed torque is required to be detected by using a torque sensor, and is usually quite expensive, so that the use and maintenance cost of users are quite high, therefore, the fixed torque control can be realized without using the sensor, the preset torque output can be realized by setting preset striking times to control a motor, but due to long-term use of the tools, transmission mechanisms such as a striking block, a spring, a gear and a shaft are worn, the striking torque is in a descending trend, namely the preset torque output cannot be realized after the preset striking times are struck, and therefore, the precision of the tools is not high and unstable.
Therefore, it is necessary to design a high-precision and control-stable impact power tool to solve the above-described problems.
[ Invention ]
In view of the shortcomings of the prior art, an object of the present invention is to provide a high-precision and controlled stable impact power tool.
The invention solves the problems in the prior art by adopting the following technical scheme that the impact electric tool comprises a power supply, a driving module and a control module, wherein the driving module is connected with the power supply, the driving module is connected with a motor to drive the motor to rotate, the control module comprises a striking detection part and a controller, the controller comprises a correction parameter generation part and a compensation confirmation part connected with the correction parameter generation part, the striking detection part is connected with the compensation confirmation part, the single effective striking frequency and the actual total striking frequency are sent to the compensation confirmation part, the correction parameter generation part stores an attenuation relation curve between the total striking frequency and a torsion value, and the compensation confirmation part confirms the compensation striking frequency according to the actual total striking frequency and the attenuation relation curve and controls the motor to drive so as to compensate.
The controller comprises a processing module, the striking detection part comprises a sampling resistor connected between the power supply and the driving module and a voltage detection module connected with two ends of the sampling resistor in parallel, the voltage detection module is connected with the processing module, the processing module calculates working current, and the working current is recorded as effective striking once when the working current is not smaller than preset current and the duration is not smaller than preset time.
The single effective striking frequency is the effective striking frequency in the time from striking start to striking end of the impact electric tool in each working.
The actual total striking frequency is the total striking frequency of the impact electric tool after the impact electric tool is used from the factory.
The further improvement scheme is that the controller stores a preset torsion value and preset single striking times corresponding to the preset torsion value.
The further improvement scheme is that the compensation confirmation part is provided with compensation striking numbers needing compensation in different total striking number intervals.
The compensation confirming part confirms the compensation striking number according to the actual total striking times and the attenuation relation curve, and the controller drives the motor through the driving module to enable the torque value to reach the preset torque value.
Compared with the prior art, the invention has the beneficial effects that the attenuation relation curve between the total striking number and the torsion value is stored in the impact electric tool, when the impact electric tool works, the single effective striking number and the actual total striking number of the detection tool are sent to the compensation confirmation part, the compensation confirmation part confirms the compensation striking number according to the actual total striking number and the attenuation relation curve, and controls the motor to drive for compensation, and the real-time compensation is adopted, so that the accuracy is high and the control is stable.
[ Description of the drawings ]
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:
FIG. 1 is a block diagram of an impact power tool of the present invention;
FIG. 2 is a control circuit diagram of the impact power tool of the present invention;
FIG. 3 is a flow chart of the operating current of the impact power tool of the present invention;
FIG. 4 is a graph showing the total number of strikes versus the torque value for an impact power tool according to the present invention.
Meaning of reference numerals in the drawings:
100. impact electric tool 1, housing 11, motor 12, carrier 13, driving impact block 14, driven impact block 15, spring 2, battery 3, driving module 4, striking detection portion 41, voltage detection module 5, controller 51, correction parameter generation portion 52, compensation confirmation portion 53, and position
Management module
[ Detailed description ] of the invention
The invention will be described in further detail with reference to the drawings and embodiments.
Referring to fig. 1, the present invention relates to an impact power tool 100, the impact power tool 100 is an impact wrench, the impact power tool 100 includes a housing 1, a motor 11 accommodated in the housing 1, and a rotary impact mechanism driven by the motor 11, and a battery 2 is mounted on the housing 1 to supply power to the motor 11. The impact power tool 100 applies a rotational force and a striking force to an output shaft to intermittently transmit the rotational striking force to a front end tool such as a driving bit to tighten a screw or a bolt. The rotary impact mechanism comprises a planet carrier 12 rotationally driven by the motor 11, a driving impact block 13 sleeved on the planet carrier 12 and a driven impact block 14 matched with the driving impact block 13, wherein a spring 15 is arranged between the driving impact block 13 and the planet carrier 12, one end of the spring 15 is abutted against the planet carrier 12, and the other end is abutted against the driving impact block 13. When the front end tool is in a close screwing state or loaded with a large load, the driving impact block 13 moves back and forth under the action of the spring 15 and intermittently drives the driven impact block 14 to rotate, so as to realize striking motion and further fasten a screw or a bolt.
After the impact electric tool 100 leaves the factory, the torque value generated by the rotary impact mechanism is determined, and is determined by the size of the transmission mechanism such as the impact block, the spring 15, the gear, etc., so that the preset number of times of single striking can be set to realize the output of the preset torque value. Referring to fig. 2, the present invention relates to a control circuit diagram of an impact power tool 100, the impact power tool 100 further includes a driving module 3 and a control module connected to the power source, the driving module 3 is connected to the motor 11 to drive the motor 11 to rotate, the control module includes a striking detection portion 4 and a controller 5, the controller 5 includes a correction parameter generation portion 51 and a compensation confirmation portion 52 connected to the correction parameter generation portion 51, the striking detection portion 4 is connected to the compensation confirmation portion 52 and sends a single effective striking frequency and an actual total striking frequency to the compensation confirmation portion 52, the correction parameter generation portion 51 stores an attenuation relation curve between a total striking frequency and a torque value, and the compensation confirmation portion 52 confirms a compensation striking frequency according to the actual total striking frequency and the attenuation relation curve and controls the motor 11 to drive for compensation.
The controller 5 is a microprocessor and includes a processing module 53, a memory for storing processing programs, control data, and temporary storage data, a timer, and the like. The striking detection portion 4 includes a sampling resistor R connected between the power supply and the driving module 3 and a voltage detection module 41 connected in parallel to two ends of the sampling resistor R, the voltage detection module 41 is connected to a processing module 53, the processing module 53 calculates a working current, the memory stores a preset current and a preset time value, the processing module 53 determines that the working current is not less than the preset current and the duration is not less than the preset time, and the working current is recorded as an effective striking once, in this embodiment, as shown in fig. 3, the preset current is I1, the time t1 to t2 is an effective working once, the time t3 to t4 is an effective working once, and the memory stores a single effective striking frequency and an actual total striking frequency, where the single effective striking frequency is an effective striking frequency in a time from striking start to striking end of the electric impact tool 100 during each working, and the actual total striking frequency is a total number of striking leaving factories after the electric impact tool 100 is used from start.
The damping relation curve is a characteristic curve generated by experimental tests before the impact electric tool 100 leaves the factory, the total striking number is the total number of times the impact electric tool 100 can strike, according to the damping relation curve, the compensation confirming part 52 is provided with compensation striking numbers to be compensated in different total striking number intervals, the controller 5 drives the motor 11 through the driving module 3 to enable the torque value to reach the preset torque value, and the compensation striking numbers are positively correlated with the total striking numbers, namely, the larger the total striking number is, the larger the compensation striking number is. Referring to fig. 4, in this embodiment, a graph of the total number of hits and the torque value of the impact electric tool 100 is shown, the curve a is a decay curve of the total number of hits and the torque value, the curve b is the preset torque value, the preset torque value is 280n.m, the corresponding preset number of hits is 50 times, i.e. the output of 280n.m force can be achieved by 50 times, the total number of hits interval is set to 10W times, since the decay of the impact electric tool 100 is in a fast decreasing trend, the number of hits is increased by 10 times on the basis of 50 times when the actual total number of hits is 10W to 20W, the number of hits is increased by 20 times on the basis of 50 times when the actual total number of hits is 20W to 30W, the number of hits is increased by 30 times on the basis of 50 times when the actual total number of hits is 30W to 40W, the number of hits is increased by 50 times on the basis of 50 times, the number of hits is more than 100 times when the actual total number of hits is increased by 50 times. Of course, the damping relationship curves of the impact power tools of different models are different, and the compensation times in different sections are also different. By setting the damping relation curve and the compensation striking number before leaving the factory, the device can realize effective compensation after long-term use so as to realize fixed torque output, and has simple control and low cost.
The invention stores the damping relation curve between the total striking number and the torsion value in the impact electric tool 100, when in operation, the single effective striking number and the actual total striking number of the detection tool are sent to the compensation confirmation part 52, the compensation confirmation part 52 confirms the compensation striking number according to the actual total striking number and the damping relation curve, and controls the motor 11 to drive for compensation, and the real-time compensation is adopted, so that the accuracy is high and the control is stable.
The present invention is not limited to the above-described embodiments. Those skilled in the art will readily appreciate that many other alternatives to the impact power tool of the present invention are possible without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the claims.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123199344 | 2021-12-18 | ||
| CN2021231993444 | 2021-12-18 |
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| Publication Number | Publication Date |
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| CN115805568A CN115805568A (en) | 2023-03-17 |
| CN115805568B true CN115805568B (en) | 2025-02-18 |
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| CN202211465860.3A Active CN115805568B (en) | 2021-12-18 | 2022-11-22 | An impact power tool |
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Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04109867U (en) * | 1991-03-07 | 1992-09-24 | 瓜生製作株式会社 | Torque control type impact wrench |
| JP3690091B2 (en) * | 1997-11-05 | 2005-08-31 | 日産自動車株式会社 | Impact type screw tightening method and equipment |
| CA2450137A1 (en) * | 2001-06-25 | 2003-01-03 | Lutz Axel May | Power torque tool |
| JP4093145B2 (en) * | 2003-08-26 | 2008-06-04 | 松下電工株式会社 | Tightening tool |
| JP2009083002A (en) * | 2007-09-27 | 2009-04-23 | Panasonic Electric Works Co Ltd | Impact rotary tool |
| JP4412377B2 (en) * | 2007-09-28 | 2010-02-10 | パナソニック電工株式会社 | Impact rotary tool |
| JP5935983B2 (en) * | 2012-03-29 | 2016-06-15 | 日立工機株式会社 | Electric tool |
| CN103056818B (en) * | 2013-01-08 | 2015-10-28 | 黄山市斯特尔机械制造有限公司 | For torque control method and the electric wrench thereof of numerical control electric constant torque wrench |
| CN104227634B (en) * | 2013-06-09 | 2017-01-18 | 南京德朔实业有限公司 | Impact type fastening tool and control method thereof |
| JP6245943B2 (en) * | 2013-10-31 | 2017-12-13 | Ｔｏｎｅ株式会社 | Fastening device |
| CN205386786U (en) * | 2016-03-14 | 2016-07-20 | 郑州时享电子技术有限公司 | Accurate controllable electronic impact wrench of output torque |
| DE102017119623B4 (en) * | 2017-08-28 | 2019-10-24 | China Pneumatic Corporation | Torque control system and torque control method for electric shock with adjustable torque |
| CN108188968B (en) * | 2018-03-09 | 2023-07-25 | 黄山市星河机器人有限公司 | Electric impact wrench and control method for assembly torque thereof |
| CN110228033B (en) * | 2019-06-18 | 2021-05-07 | 孟朝晖 | Electric fixed-torque wrench control device, wrench and control method |
| CN115427897A (en) * | 2020-01-30 | 2022-12-02 | 米沃奇电动工具公司 | Automatic step drill bit detection |
-
2022
- 2022-11-22 CN CN202211465860.3A patent/CN115805568B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 定扭矩电动冲击扳手控制系统研究;马亮;中国优秀硕士学位论文全文数据库工程科技Ⅱ辑;20220315(第3期);全文 * |
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