CN210270541U

CN210270541U - Wireless electric impact tool control system capable of maintaining same tightness

Info

Publication number: CN210270541U
Application number: CN201921428372.9U
Authority: CN
Inventors: 王德煌
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-04-07
Anticipated expiration: 2029-08-30

Abstract

The utility model relates to a can maintain wireless electronic impact tool control system of same tightness contains: a current detection circuit for detecting a load current signal; a first filter circuit electrically connected to the current detection circuit and filtering the load current signal; the amplifying circuit is electrically connected with the first filter circuit to amplify the load current signal; the second filter circuit is electrically connected with the amplifying circuit and is used for filtering the load current signal; a central processing unit electrically connected to the second filter circuit and defaulting a fixed current and a preset striking frequency; a wireless communication module electrically connected to the CPU; the central processing unit is used for outputting stable torque force and the same striking times, so that locking components such as screws can be locked with the same tightness, and the torque force and the striking times during use are wirelessly transmitted back to a monitoring device.

Description

Wireless electric impact tool control system capable of maintaining same tightness

Technical Field

The utility model relates to an electric impact tool control system especially indicates a wireless electric impact tool control system that can maintain the same degree of tightness.

Background

For the constructors of engineering construction, large and small locking parts such as screws, threads, nuts, bolts and the like are often used for fixing the workpiece. If the furniture needs to be disassembled and assembled in a common household, the screws are always disassembled. In order to facilitate the assembly and disassembly process, no matter whether large workpieces or small tools or equipment are assembled and disassembled, a manual screwdriver is often used to lock/loosen screws.

The conventional electric/pneumatic tool, such as an electric screwdriver, is more convenient than a manual screwdriver, and a user only needs to hold the electric screwdriver by hand and put a screwdriver head into a screw hole and then press a start key of the electric screwdriver, so that the electric screwdriver can automatically drive a screw to rotate to lock or loosen, and the user does not need to rotate the screwdriver by hand, thereby being more convenient in use.

However, when the conventional electric/pneumatic tool locks the screw, it is not possible to check whether the screw is actually locked, and the operator must feel the locked screw, and thus, the operator can determine the locking state by himself or herself when the screw cannot be further locked. Therefore, if the worker feels that the screws are locked, the screws which are not locked are judged to be locked, so that the structural connection strength is insufficient, and subsequent accidents are likely to happen.

In addition, if the worker worrys about the repeated locking due to insufficient screw locking, the striking frequency is increased, the screw is also stressed by overload, the screw is damaged, the strength is reduced, and the stability of the structure is possibly influenced.

SUMMERY OF THE UTILITY MODEL

In order to ensure that locking parts such as screws and nuts can be locked really, the utility model provides a wireless electric impact tool control system capable of maintaining the same tightness, which is characterized in that the central processing unit is used for uniformly striking the parts and outputting torque force for stabilizing the locking, so that the tightness of each locking part is maintained to be consistent, the structural strength is maintained, and the integrity of the parts is maintained.

To achieve the above object, the present invention provides a control system for a wireless electric impact tool capable of maintaining the same tightness, comprising:

a current detection circuit for detecting a load current signal, wherein the load current signal is a current for driving a screwdriver head cap to rotate by the electric impact tool;

a first filter circuit electrically connected to the current detection circuit for filtering the load current signal to obtain a first stable current signal;

the amplifying circuit is electrically connected with the first filter circuit and is used for amplifying the first stable current signal to generate an amplified current signal;

the second filter circuit is electrically connected with the amplifying circuit and is used for filtering the amplified current signal again to obtain a second stable current signal;

a band-pass filter circuit electrically connected to the second filter circuit for filtering the noise of the second stable current signal and generating an output current signal;

a waveform conversion circuit electrically connected to the band-pass filter circuit for converting the output current signal into a square wave current signal, wherein the square wave current signal represents the actual striking frequency;

a central processing unit electrically connected to the second filter circuit and the waveform conversion circuit, and having a predetermined constant current signal and a predetermined striking frequency; the central processing unit adjusts the second stable current signal to be the same as the fixed current signal so as to control the screwdriver head cap to output stable torque force, and stops driving the screwdriver head cap to rotate when the actual striking frequency is judged to reach the preset striking frequency;

the wireless communication module is electrically connected with the central processing unit and is used for wirelessly connecting an external monitoring device.

Optionally, the wireless communication module includes a bluetooth communication unit, and the bluetooth communication unit is used for wirelessly connecting the monitoring device.

Optionally, the wireless communication module comprises an infrared communication unit, and the infrared communication unit is used for wirelessly connecting a remote controller.

Optionally, the central processing unit includes:

a current signal detector for detecting the second stable current signal;

and a striking frequency detector for detecting the frequency of the occurrence of the peak in the square wave current signal, wherein the frequency of the occurrence of the peak in the square wave current signal represents the actual striking frequency.

Optionally, the wireless electric impact tool control system capable of maintaining the same tightness further includes a third filter circuit, and the third filter circuit is electrically connected to the amplifying circuit and the band-pass filter circuit for further filtering the amplified current signal.

Optionally, in the control system of the wireless electric impact tool capable of maintaining the same tightness, the cpu executes a current compensation mode, and when the battery power of the control system of the electric impact tool capable of maintaining the same tightness is insufficient, the cpu executes the current compensation mode to increase the load current signal.

Optionally, the cpu increases the load current signal by using a pwm technique.

Optionally, the current detection circuit includes a first resistor and a second resistor connected in parallel.

Optionally, the filter circuit includes a resistor, and a first capacitor and a second capacitor connected in parallel. Optionally, the amplifying circuit includes a first amplifier, a third capacitor, a third resistor and a fourth resistor; the non-inverting input end of the first amplifier is electrically connected with the first filter circuit, and the inverting input end of the first amplifier is electrically connected with the fourth resistor and then grounded; the third capacitor is electrically connected to the inverting input end and the output end of the first amplifier; the third resistor is connected in parallel with the third capacitor.

The utility model discloses a fixed torque output of this second filter circuit, and utilize this waveform conversion circuit to convert this output current signal into this square wave current signal, and hit the number of times by the actual striking number of times of this central processing unit control and accord with and predetermine the striking number of times, it is the same to keep the part atress on the one hand, can not lead to structural damage to make intensity descend because of certain part atress is too big, on the other hand is avoiding the part not to lock and is making structure bonding strength descend equally, prevent that the staff from relying on the sensation lock solid part and making the tightness have some errors, influence structural strength.

The utility model discloses a this monitoring device is connected to this radio communication module, make this monitoring device and this radio communication module can wireless mode exchange this electric impact tool's lock attach information, the rotational speed of this electric impact tool of this monitoring device supervision of rear end administrator accessible when using, the number of segments, torsion change, the lock attaches success (OK) number of times, the lock attaches failure (NG) number of times, let the administrator of rear end can master every screw in detail and correctly lock and attach, whether the process of traceing back in the past is correctly accomplished according to the regulation, and the screw that the lock attached is not accomplished to further reinforcement. Meanwhile, a manager at the rear end can know whether the electric impact tool has expired the maintenance period according to the attached times and the use time of the electric impact tool, so that the electric impact tool which accords with the maintenance period enters a factory for maintenance, the use quality of the electric impact tool is maintained, and the use times and the service life are prolonged.

Moreover, the monitoring device can simultaneously set one or more electric impact tools in a wireless mode, and workers do not need to set the electric impact tools one by one, so that the set time is saved. In addition, because the projects carried out on each construction site are different, different screws and workpieces can be used, and a manager at the rear end can wirelessly transmit the locking parameters suitable for the screws and the workpieces used on the construction site to each electric impact tool, so that the set time can be saved.

Drawings

FIG. 1: the utility model discloses a three-dimensional outward appearance schematic diagram.

FIG. 2: the utility model discloses a circuit framework schematic diagram.

FIG. 3: the utility model discloses with monitoring device, remote controller wireless connection schematic diagram.

Fig. 4A to 4F: the utility model discloses a current waveform schematic diagram.

FIG. 5: the utility model discloses an operation interface plane schematic diagram.

Detailed Description

The following description of the preferred embodiments of the present invention will be made in conjunction with the drawings and the accompanying drawings to further illustrate the technical means adopted to achieve the objects of the present invention.

Referring to fig. 1, the present invention provides a control system for a wireless electric impact tool capable of maintaining the same tightness, which is applied to the electric impact tool 80 shown in fig. 1, and controls the rotation torque and the striking frequency to be consistent when a screwdriver head cap is used to lock a screw, a nut, and other parts, thereby unifying the tightness of the part locking.

Referring to fig. 2, the system for controlling a wireless electric impact tool capable of maintaining the same tightness of the present invention comprises: a current detection circuit 10, a first filter circuit 20, an amplifying circuit 30, a second filter circuit 40, a band-pass filter circuit 50, a waveform conversion circuit 60 and a wireless communication module 92. Wherein, the first filter circuit 20 is electrically connected to the current detection circuit 10; the amplifying circuit 30 is electrically connected to the first filter circuit 20; the second filter circuit 40 is electrically connected to the amplifying circuit 30; the band-pass filter circuit 50 is electrically connected to the second filter circuit 40; the waveform converting circuit 60 is electrically connected to the band-pass filter circuit 50.

The following describes the preferred embodiment and operation of each circuit in sequence.

Referring to fig. 2 and 4A, the current detection circuit 10 is configured to receive a load current signal and detect the load current signal, wherein the load current signal is generated by a resistance encountered by the actuation of the electric impact tool, for example, the harder the screw lock is tightened, the harder the driver's head cap of the electric impact tool is rotated, and the greater the load current signal is; if the screw is loosened, the driver head cap of the electric impact tool is easier to rotate, and the load current signal is smaller at the moment. Fig. 4A is a waveform diagram of a load current signal having large fluctuations as shown in fig. 4A. In the preferred embodiment of the present invention, the current detection circuit 10 includes a first resistor R1 and a second resistor R2 connected in parallel, wherein the first resistor R1 and the second resistor R2 can be resistors with smaller resistance.

Referring to fig. 2 and 4B, the first filter circuit 20 receives the load current signal and filters the load current signal to obtain a more stable first stable current signal. Fig. 4B is a waveform diagram of the first stabilization current signal, and as shown in fig. 4B, the waveform of the first stabilization current signal is relatively gentle. In the preferred embodiment of the present invention, the first filter circuit 20 comprises a resistor and two first capacitors C1 and a second capacitor C2 connected in parallel.

Referring to fig. 2 and 4C, the amplifying circuit 30 is configured to receive the first stable current signal and amplify the first stable current signal to generate an amplified current signal. Fig. 4C is a waveform diagram of the amplified current signal, which is significantly larger than the steady current signal, as shown in fig. 4C. In the preferred embodiment of the present invention, the amplifying circuit 30 includes a first amplifier 31, a third capacitor C3, a third resistor R3 and a fourth resistor R4. The non-inverting input terminal of the first amplifier 31 is electrically connected to the first filter circuit 20, and the inverting input terminal of the first amplifier 31 is electrically connected to the fourth resistor R4 and then grounded; the third capacitor C3 is electrically connected to the inverting input terminal and the output terminal of the first amplifier 31; the third resistor R3 is connected in parallel with the third capacitor C3. By combining the amplifier, the capacitor and the resistor, the first stable current signal can be amplified to the amplified current signal suitable for the 0-5V circuit.

The second filter circuit 40 is used for filtering the amplified current signal again to obtain a second stable current signal. The second filter circuit 40 can be further electrically connected to a central processing unit 91, and transmits the second stable current signal to the central processing unit 91, and a current signal detector of the central processing unit 91 detects the second stable current signal. In the preferred embodiment of the present invention, the second filter circuit 40 includes a fourth capacitor C4 and a fifth capacitor C5 connected in parallel, one end of the fourth capacitor C4 is connected in series with a resistor and then connected to the amplifying circuit 30, and the other end is grounded; one end of the fifth capacitor C5 is further connected to the cpu 91.

Furthermore, in order to fix the torque output during striking, the cpu 91 defaults to a fixed current, and when the second stable current signal is smaller than the fixed current, the cpu 91 controls to increase the second stable current signal to the fixed current, so that the control system of the wireless electric impact tool capable of maintaining the same tightness can fix the torque output during striking, thereby achieving the consistent striking force each time. Wherein, the striking force can be adjusted by the user, and the striking force can be adjusted according to the requirement.

Referring to fig. 2 and 4E, the band-pass filter circuit 50 is used to filter the signal with too high or too low frequency in the second stable current signal and generate an output current signal with peak and valley values at the same level. FIG. 4E is a waveform diagram of the second steady current signal, as shown in FIG. 4E, after the second steady current signal has been removed from the signals with the frequencies too high and too low. In the preferred embodiment of the present invention, the band-pass filter circuit 50 includes a seventh capacitor C7, an eighth capacitor C8 and a sixth resistor R6. One end of the seventh capacitor C7 is electrically connected to the amplifying circuit 30 and the filtering circuit 40; the sixth resistor R6 is connected in parallel with the eighth capacitor C8 and then connected in series with the other end of the seventh capacitor C7.

Referring to fig. 2 and 4D, in the preferred embodiment of the present invention, a third filter circuit 70 is further included, and the third filter circuit 70 is electrically connected to the amplifying circuit 30 and the band pass filter circuit 50. Fig. 4D is a waveform diagram of the amplified current signal being filtered again, wherein the third filter circuit 70 includes a fifth resistor R5 and a sixth capacitor C6, one end of the fifth resistor R5 is electrically connected to the output terminal of the first amplifier 31, and the other end is electrically connected to one end of the sixth capacitor C6; the other terminal of the sixth capacitor C6 is connected to ground. The third filter circuit 70 can filter the amplified current signal again to obtain a smoother, noiseless second stable current signal. Fig. 4D shows waveforms of the amplified current signals with two different magnitudes, which represent that the amplified current signals, no matter the amplified current signals are high current signals and low current signals, are filtered to the same level by the band-pass filter circuit 50 for subsequent determination; the result after filtering is shown in fig. 4E.

Referring to fig. 2 and 4F, the waveform converting circuit 60 is used to convert the output current signal into a square wave current signal, so that the output current signal is converted from a sine wave form into a square wave form. The waveform converting circuit 60 inputs the square wave current signal into the central processing unit 91, and a hit count detector of the central processing unit 91 detects the number of times of occurrence of peaks in the square wave current signal. Fig. 4F is a schematic diagram of the waveform of the output current signal converted into the square wave current signal, and as shown in fig. 4F, the peak value of the output current signal is sampled to be a square wave current signal peak value 63. Wherein, the waveform converting circuit 60 defaults to a striking threshold, and when the output current signal is higher than the striking threshold, the waveform converting circuit 60 samples the output current signal to a high level; when the output current signal is lower than the striking threshold, the waveform conversion circuit 60 samples the output current signal to a low level, and the square wave current signal is formed by the high level and the low level and is input to the central processing unit 91.

In the preferred embodiment of the present invention, the waveform converting circuit 60 is a schmitt trigger circuit, and includes a second amplifier 61, a ninth capacitor C9, a tenth capacitor C10, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9. The inverting input terminal of the second amplifier 61 is connected to the band-pass filter circuit 50, and the non-inverting input terminal is connected to the ninth resistor R9 and then grounded; the ninth capacitor C9 is connected between the power input terminal of the second amplifier 61 and ground; the eighth resistor R8 is connected to the output terminal of the second amplifier 61 and the ninth resistor R9; the seventh resistor R7 is connected to the output terminal of the second amplifier 61 and further connected to the cpu 91; one end of the tenth capacitor C10 is connected to the seventh resistor R7 and the cpu 91, and the other end is grounded.

The hit count detector of the cpu 91 determines the actual number of hits according to the number of high levels in the square wave current signal, wherein the number of high levels is equal to the actual number of hits.

This central processing unit 91 defaults to have one simultaneously and predetermines the number of times of striking, and it is the same with this predetermined number of times of striking to judge current number of times of striking when this striking count detector, the utility model discloses can maintain the wireless electric impact tool control system control this bottle opener cap of the same degree of tightness and stop rotatoryly. Wherein the preset striking frequency can be adjusted by the user.

The wireless communication module 92 is electrically connected to the cpu 91 for wirelessly connecting to an external remote controller 93 or a monitoring device 94, wherein the monitoring device 94 may be a management computer or a cloud server. The monitoring device 94 can wirelessly set parameters of one or more electric impact tools 80, such as torque values, striking frequency, etc. of the electric impact tools 80, and can set parameter values of one or more electric impact tools 80 during production. Furthermore, when the electric impact tool 80 is currently used or after being used, the electric impact tool 80 can transmit the relevant data during use back to the monitoring device 94 through the wireless communication module 92, such as the rotation speed, the number of stages, the torque variation, the number of times of successful locking (OK) and the number of times of failed locking (NG) during use, so that the manager at the rear end can control the use status of the electric impact tool 80 through the monitoring device 94. In the preferred embodiment of the present invention, the wireless communication module 92 comprises a bluetooth communication unit, which can exchange data with the monitoring device 94 by means of bluetooth communication.

The electric impact tool 80 can further manage the locking data of the electric impact tool 80 when locking each screw through the wireless communication module 92 and the monitoring device 94. Specifically, when the electric impact tool 80 locks each screw, the locking data of each screw is transmitted back to the monitoring device 94 through the wireless communication module 92, so that the monitoring device 94 obtains the data of the number of times of striking, the torque force, etc. of each screw. Furthermore, when the current striking frequency of the electric impact tool 80 is the same as the preset striking frequency and the torque force borne by the screw lock is the same as the preset torque force, the cpu 91 generates a completion signal and transmits the completion signal to the monitoring device 94 through the wireless communication module 92, so that the monitoring device 94 can control which screws are locked correctly and further trace which screws have not been locked correctly and the torque force value does not reach the preset standard, thereby reinforcing the screws which are not locked correctly.

The wireless communication module 92 can further be wirelessly connected to the remote controller 93. Similar to the monitoring device 94, the remote controller 93 can also set the relevant parameters of the wireless communication module 92 in a wireless manner. However, the remote controller 93 may further provide an authority control pipe, for example, if the parameters of the electric impact tool 80 are to be set through the remote controller 93, a password needs to be input or the electric impact tool 80 needs to be unlocked through other methods to enter a parameter setting mode, so that a supervisor with authority can manage the parameter setting of the electric impact tool 80, and the situation that the parameters of the electric impact tool 80 are changed by unauthorized or accidental touch by a worker, so that the electric impact tool 80 does not lock screws according to the specified data to affect the connection strength of the workpieces is avoided. In the preferred embodiment of the present invention, the wireless communication module 92 comprises an infrared communication unit, so that the remote controller can wirelessly communicate with the electric impact tool through the infrared communication unit.

Furthermore, the cpu 91 of the present invention further executes a current compensation mode. When the battery power of the electric impact tool 80 is insufficient to decrease the voltage, in order to maintain a constant output power to provide a constant torque output, the cpu 91 performs the current compensation mode to control the increase of the load current signal, and increases the output current in the voltage decreasing state to maintain the same power, i.e., constant torque output, so that the screws and other parts can be locked with the same tightness when the battery power is insufficient. In the preferred embodiment of the present invention, the cpu 91 utilizes Pulse Width Modulation (PWM) to increase the load current signal.

Referring to fig. 5, a display interface 81 may be disposed on the appearance of the present invention, and the display interface 81 includes a first button 82, a second button 83, a third button 84, a plurality of display lamps 85 and a plurality of seven-segment displays 86. The first button 82, the second button 83, the third button 84, the plurality of display lamps 85 and the plurality of seven-segment displays 86 are all electrically connected to the central control unit 91, wherein the first button 82 can switch the plurality of seven-segment displays 86 to display each setting value; the second button 83 can switch different functions, such as setting striking force, striking times and floating lock turns; the third button 84 can confirm the inputted setting value. The plurality of display lamps 85 can display different colors and numbers according to the current status of the control system of the wireless electric impact tool capable of maintaining the same tightness.

The utility model utilizes the second filter circuit 40 to transmit the second stabilized current signal after arrangement to the current detector, and the central processing unit 91 controls the second stabilized current signal to maintain the same value as the fixed current value, thereby ensuring the consistency of torque output; meanwhile, the waveform converting circuit 60 converts the output current signal into the square wave current signal, and the striking count detector determines the actual striking frequency, and the cpu 91 controls the actual striking frequency to be the same as the preset striking frequency. By the technical means of controlling the striking frequency and controlling the current output, the parts such as each screw can be locked with the same tightness, and the connection strength of the workpiece is improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with the preferred embodiment, but not limited to the present invention, any skilled person in the art can make some modifications or equivalent changes to the technical content disclosed above without departing from the technical scope of the present invention, but all the technical matters of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A system for controlling a cordless power impact tool to maintain a uniform tightness, comprising:

a central processing unit electrically connected with the second filter circuit and the waveform conversion circuit and defaulted with a fixed current signal and a preset striking frequency; the central processing unit adjusts the second stable current signal to be the same as the fixed current signal so as to control the screwdriver head cap to output stable torque force, and stops driving the screwdriver head cap to rotate when the actual striking frequency is judged to reach the preset striking frequency;

2. The system of claim 1, wherein the wireless communication module comprises a bluetooth communication unit for wirelessly connecting to the monitoring device.

3. The system of claim 1 or 2, wherein the wireless communication module comprises an infrared communication unit for wirelessly connecting to a remote controller.

4. The system of claim 3, wherein the CPU comprises:

a current signal detector for detecting the second stable current signal;

5. The system of claim 4, further comprising a third filter circuit electrically connected to the amplifier circuit and the band pass filter circuit for further filtering the amplified current signal.

6. The system of claim 5, wherein the CPU performs a current compensation mode to increase the load current signal when the battery power of the system is low.

7. The system of claim 6, wherein the CPU increases the load current signal by pulse width modulation.

8. The system of claim 7, wherein the current detection circuit comprises a first resistor and a second resistor connected in parallel.

9. The system of claim 8, wherein the filter circuit comprises a resistor and a first capacitor and a second capacitor connected in parallel.

10. The system of claim 9, wherein the amplifier circuit comprises a first amplifier, a third capacitor, a third resistor and a fourth resistor; the non-inverting input end of the first amplifier is electrically connected with the first filter circuit, and the inverting input end of the first amplifier is electrically connected with the fourth resistor and then grounded; the third capacitor is electrically connected to the inverting input end and the output end of the first amplifier; the third resistor is connected in parallel with the third capacitor.