CN217596956U

CN217596956U - Electric screw driver

Info

Publication number: CN217596956U
Application number: CN202220552302.XU
Authority: CN
Inventors: 王林; 王小波
Original assignee: Shenzhen Guantengda Technology Co ltd
Current assignee: Shenzhen Guantengda Technology Co ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-10-18
Anticipated expiration: 2032-03-11

Abstract

The utility model discloses an electric screwdriver, including electric screwdriver main part, detection device, signal output circuit and output device. The detection device is connected with the electric screwdriver body and used for detecting the torsion of the electric screwdriver body, outputting a first voltage signal when the detected torsion value reaches a preset torsion value and outputting a second voltage signal when the detected torsion value is smaller than the preset torsion value. The input end of the signal output circuit is electrically connected with the output end of the detection device, and the signal output circuit is used for outputting a corresponding torsion signal according to the first voltage signal or the second voltage signal. The input end of the output device is electrically connected with the output end of the signal output circuit, and the output device is used for outputting corresponding torque information according to the torque signal. The utility model discloses whether will detect the screw and screw up and convert the torsion that detects electric screwdriver into, detect more aspect. The problem of electric screwdriver can't know directly perceivedly whether the screw is screwed up when screwing up the screw is solved.

Description

Electric screw driver

Technical Field

The utility model relates to a brushless motor, concretely relates to electric screwdriver.

Background

A power screwdriver is a power tool used to tighten and rotate screws. The electric tool has the advantages of independent power supply, convenient use, relatively high torque precision, comfortable operation hand feeling and the like, and is an indispensable production tool for improving the working efficiency and the product quality in the modern industrial production assembly. At present, when the electric screwdriver is used for screwing screws, whether the screws are screwed down or not cannot be intuitively known, and time is consumed for manually checking whether the screws are screwed down or not.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main objective is overcome not enough among the prior art, provides an electric screwdriver, aims at the torsion of automated inspection electric screwdriver during operation whether screws up with the definite screw to output corresponding information.

In order to achieve the above object, the utility model provides an electric screwdriver, electric screwdriver includes:

an electric screwdriver body;

the detection device is connected with the electric screwdriver body and is used for detecting the torsion of the electric screwdriver body, outputting a first voltage signal when the detected torsion value reaches a preset torsion value and outputting a second voltage signal when the detected torsion value is smaller than the preset torsion value;

the input end of the signal output circuit is electrically connected with the output end of the detection device, and the signal output circuit is used for outputting a corresponding torsion signal according to the first voltage signal or the second voltage signal; and

and the input end of the output device is electrically connected with the output end of the signal output circuit, and the output device is used for outputting corresponding torque information according to the torque signal.

In one embodiment, the signal output circuit includes a first switching circuit and a first optocoupler;

the controlled end of the first switch circuit is electrically connected with the output end of the detection device, the input end of the first switch circuit is used for accessing a power supply voltage, the output end of the first switch circuit is grounded, and the first switch circuit is used for disconnecting a path between the input end and the output end according to the first voltage signal and connecting the path between the input end and the output end according to the second voltage signal;

the input end of the first optical coupler is used for being connected with a power supply voltage, the input end of the first optical coupler is further connected with the input end of the first switching circuit, and the output end of the first optical coupler is connected with the input end of the output device.

In one embodiment, the first switch circuit comprises a first switch tube, a first capacitor and a second capacitor;

the controlled end of the first switch tube is electrically connected with the output end of the detection device, the input end of the first switch tube is used for accessing a power supply voltage, the input end of the first switch tube is also connected with the input end of the first optical coupler, and the output end of the first switch tube is grounded;

the first switch tube is used for switching off a path between an input end and an output end according to the first voltage signal and switching on the path between the input end and the output end according to the second voltage signal;

the first capacitor is connected in parallel to the controlled end and the output end of the first switch tube, and the second capacitor is connected in parallel to the input end and the output end of the first switch tube.

In one embodiment, the electric screwdriver further comprises a starting output circuit;

the input end of the starting output circuit is connected with the electric screwdriver main body, and the output end of the starting output circuit is electrically connected with the output device;

the electric screwdriver body is further used for outputting a third voltage signal and a fourth voltage signal when being started, the starting output circuit is used for outputting a corresponding starting signal according to the third voltage signal and the fourth voltage signal, and the output device is further used for outputting corresponding starting information according to the starting signal.

In one embodiment, the start-up output circuit includes a second switch circuit, a third switch circuit, and a second optocoupler;

the controlled end of the second switch circuit is electrically connected with the electric screwdriver body, the input end of the second switch circuit is used for accessing power supply voltage, the output end of the second switch circuit is grounded, and the second switch circuit is used for switching on/off a path between the input end and the output end according to the third voltage signal;

the controlled end of the third switch circuit is electrically connected with the electric screwdriver body, the input end of the third switch circuit is used for accessing power supply voltage, the input end of the third switch circuit is also connected with the input end of the second switch circuit, the output end of the third switch circuit is connected with the second optical coupler, and the third switch circuit is used for switching on/off a passage between the input end and the output end according to the fourth voltage signal;

and the output end of the second optical coupler is connected with the input end of the output device.

In one embodiment, the second switch circuit includes a second switch tube, a third capacitor and a fourth capacitor;

the controlled end of the second switch tube is electrically connected with the electric screwdriver body, the input end of the second switch tube is used for accessing power supply voltage, the output end of the second switch tube is grounded, and the second switch tube is used for disconnecting a path between the input end and the output end according to the third voltage signal;

the third capacitor is connected in parallel to the controlled end and the output end of the second switch tube, and the fourth capacitor is connected in parallel to the input end and the output end of the second switch tube.

In one embodiment, the third switching circuit comprises a third switching tube, a fifth capacitor and a sixth capacitor;

the controlled end of the third switch tube is electrically connected with the electric screwdriver body, the input end of the third switch tube is used for accessing power supply voltage, the input end of the third switch tube is also connected with the input end of the first switch tube, the output end of the third switch tube is grounded, and the third switch tube is used for switching on a path between the input end and the output end according to the fourth voltage signal;

the fifth capacitor is connected in parallel to the controlled end and the output end of the third switching tube, and the sixth capacitor is connected in parallel to the input end and the output end of the third switching tube.

In one embodiment, the electric screwdriver further comprises an interference filtering circuit;

the input end of the interference filtering circuit is electrically connected with the detection device, the first output end of the interference filtering circuit is connected with the input end of the signal output circuit, the second output end of the interference filtering circuit is connected with the input end of the starting output circuit, and the interference filtering circuit is used for filtering the interference voltage signal output by the detection device.

In one embodiment, the electric screwdriver further comprises a voltage reduction circuit;

the input end of the voltage reduction circuit is used for being connected with a power supply, the output end of the voltage reduction circuit is connected with the signal output circuit and the starting output circuit respectively, and the voltage reduction circuit is used for reducing the voltage of the power supply voltage and then outputting the power supply voltage.

In an embodiment, the output device is a display output device and/or a voice output device.

The utility model discloses an whether the screw is screwed up is confirmed to automated inspection electric screwdriver's torsion to output corresponding information. Whether the detection screw is screwed up or not is converted into the torque force for detecting the electric screwdriver, so that the detection is more convenient. The problem that whether the electric screwdriver is screwed up or not cannot be intuitively known when the electric screwdriver is used for screwing up the screws is solved, and the operation efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of an electric screwdriver according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an electric screwdriver according to an embodiment of the present invention;

fig. 3 is a schematic structural view of an electric screwdriver according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a signal output circuit according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a start output circuit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a voltage reducing circuit according to an embodiment of the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1 to 3, the present invention provides an electric screwdriver, which comprises an electric screwdriver body 100, a detection device 200, a signal output circuit 300 and an output device 400.

The detecting device 200 is connected to the electric screwdriver body 100, and the detecting device 200 is configured to detect a torque of the electric screwdriver body 100, output a first voltage signal when detecting that the torque reaches a preset torque, and output a second voltage signal when detecting that the torque is smaller than the preset torque.

The input end of the signal output circuit 300 is electrically connected to the output end of the detection device 200, and the signal output circuit 300 is configured to output a corresponding torque signal according to the first voltage signal or the second voltage signal.

The input end of the output device 400 is electrically connected to the output end of the signal output circuit 300, and the output device 400 is configured to output corresponding torque information according to the torque signal.

The detection device 200 includes a magnet 210 and a magnetic induction assembly 220. The magnetic induction unit 220 is fixed to the vicinity of the electric screwdriver body 100 and electrically connected to the signal output circuit 300. The magnet 210 is arranged on the electric screwdriver body 100, when the torsion value of the electric screwdriver body 100 reaches a preset torsion value, the electric screwdriver body 100 pushes out the magnet 210, the magnetic induction component 220 detects the change of the magnetic field, and a first voltage signal is output; when the torque value of the electric screwdriver body 100 is less than the preset torque value, the magnet 210 has no displacement, and the magnetic induction assembly 220 outputs a second voltage signal.

In one embodiment, the electric screwdriver further includes a resilient assembly 500 and an output rod 600. The detection device further comprises a magnet rod 230 and a spring 240. When the electric screwdriver screws, the electric screwdriver body 100 interacts with the screw to generate a torque force, and when the torque force reaches a preset torque value, which indicates that the screw is tightened, the electric screwdriver bit compresses the elastic component 500, and the driving output rod 600 compresses the magnet rod 230, and further compresses the magnet 210, so that the magnet 210 moves close to the magnetic induction component 220. The magnetic induction component 220 detects the change of the magnetic field and outputs a first voltage signal to the signal output circuit 300, the signal output circuit 300 outputs a tightening signal to the output device 400 according to the first voltage signal, and the output device 400 displays the screw tightening information through a display device and/or outputs the screw tightening information through a voice output device. When the torque value does not reach the preset torque value, the screw is not tightened. At this time, the magnet 210 has no displacement, the magnetic induction component 220 outputs a second voltage signal to the signal output circuit 300, the signal output circuit 300 outputs a non-screwing signal to the output device 400 according to the second voltage signal, and the output device 400 displays the screw screwing information and/or outputs the screw screwing information by the voice of the voice output device through the display device.

The magnetic induction assembly 220 may be a linear hall sensor. The linear Hall can detect the torque force value, can change the torque force value reference point along with the temperature, and has long service life, small temperature influence and accurate torque force detection.

The utility model discloses a torsion that detects the electric screwdriver main part determines whether the screw is screwed up to output screw tightening information when confirming the screw tightening, output screw not screw up information when confirming the screw is not screwed up. The screw tightening state information which cannot be intuitively acquired is converted into the torque information which is convenient to detect, and the electric screwdriver can determine whether the screw is tightened or not by determining whether the torque value reaches the preset torque value or not. The problem of electric screwdriver can't know directly perceivedly whether the screw is tightened when screwing the screw is solved, effectively improve the operating efficiency.

Referring to fig. 4, in an embodiment, the signal output circuit 300 includes a first switching circuit 310 and a first photo coupler U1.

The controlled terminal of the first switch circuit 310 is electrically connected to the output terminal of the detection apparatus 200, the input terminal of the first switch circuit 310 is used for accessing a power supply voltage, the output terminal of the first switch circuit 310 is grounded, and the first switch circuit 310 is used for disconnecting the path between the input terminal and the output terminal according to the first voltage signal and connecting the path between the input terminal and the output terminal according to the second voltage signal.

The input end of the first optical coupler U1 is used for connecting a supply voltage, the input end of the first optical coupler U1 is further connected with the input end of the first switching circuit 310, and the output end of the optical coupler is connected with the input end of the output device 400.

When the detection device 200 outputs a first voltage signal, the first switch circuit 310 disconnects a path between the input end and the output end thereof, the first optical coupler U1 has a supply voltage input, two pins of the output end of the first optical coupler U1 are short-circuited, and a tightening signal is output; when the detection apparatus 200 outputs the second voltage signal, the first switch circuit 310 switches on the path between the input terminal and the output terminal thereof, and grounds the power supply voltage, the first optical coupler U1 has no voltage input, both feet of the output terminal of the first optical coupler U1 are open, and no signal is output.

The signal output circuit is formed by the switch circuit and the optical coupler, and the structure is simple. And the optical coupler has the function of photoelectric isolation, and plays a role in protecting the circuit of the electric screwdriver.

In an embodiment, the first switch circuit 310 includes a first switch Q1, a first capacitor C1 and a second capacitor C2.

The controlled end of the first switch tube Q1 is electrically connected to the output end of the detection device 200, the input end of the first switch tube Q1 is used for accessing a power supply voltage, the input end of the first switch tube Q1 is further connected to the input end of the first optical coupler U1, and the output end of the first switch tube Q1 is grounded.

The first switch tube Q1 is used for switching off a path between the input end and the output end according to the first voltage signal and switching on the path between the input end and the output end according to the second voltage signal.

The first capacitor C1 is connected in parallel to the controlled end and the output end of the first switch tube Q1, and the second capacitor C2 is connected in parallel to the input end and the output end of the first switch tube Q1. The first capacitor C1 is used for filtering the first voltage signal, and the second capacitor C2 is used for filtering the supply voltage.

In the above embodiment, the first switch Q1 may be an NPN transistor or an MOS transistor.

Referring to fig. 5, in one embodiment, the electric screwdriver further includes an activation output circuit 500.

The input end of the start output circuit 500 is connected to the electric screwdriver body 100, and the output end of the start output circuit 500 is electrically connected to the output device 400.

The electric screwdriver body 100 is further configured to output a third voltage signal and a fourth voltage signal when being started, the start output circuit 500 is configured to output a corresponding start signal according to the third voltage signal and the fourth voltage signal, and the output device 400 is further configured to output corresponding start information according to the start signal.

When the electric screwdriver is started, the electric screwdriver main body 100 outputs the third voltage signal and the fourth voltage signal to the start output circuit 500. When the third voltage signal is a low voltage and the fourth voltage signal is a high voltage, the start output circuit 500 is started to output a started signal to the output device 400, and the output device 400 displays start information through the display device and/or outputs start information through the voice output device according to the started signal; when the third voltage signal is a low voltage and the fourth voltage signal is a low voltage, the start output circuit 500 outputs a non-start signal, and the output device 400 displays non-start information through the display device and/or outputs non-start information through the voice output device according to the start signal; when the third voltage signal is a high voltage and the fourth voltage signal is a low voltage, the start output circuit 500 outputs a non-start signal, and the output device 400 displays non-start information through the display device and/or outputs non-start information through the voice output device according to the start signal; when the third voltage signal is a high voltage and the fourth voltage signal is a high voltage, the start-up output circuit 500 outputs a non-start-up signal, and the output device 400 displays non-start-up information through the display device and/or outputs non-start-up information through the voice output device according to the start-up signal.

In the present embodiment, the start output circuit 500 outputs corresponding start information when the electric screwdriver operates, and the output rotation direction of the electric screwdriver main body 100 can be further selected by setting the output value of the fourth voltage signal. For example, if the power screwdriver needs to output the enabled signal only when the power screwdriver is rotated clockwise to tighten the screw, and does not need to output the enabled signal when the power screwdriver is rotated counterclockwise, the power screwdriver body 100 may be configured to output a third voltage signal with a low voltage and a fourth voltage signal with a high voltage when rotated clockwise, and the enable output circuit 500 may be configured to output the enabled signal; the third voltage signal of the low voltage and the fourth voltage signal of the low voltage are output at the counterclockwise rotation, and the start output circuit 500 outputs the non-start signal.

In the present embodiment, the start output circuit 500 outputs a corresponding start signal, and the output device 400 outputs corresponding start information, so that the user can more intuitively obtain the status information of the electric screwdriver.

In one embodiment, the enable output circuit 500 includes a second switch circuit 510, a third switch circuit 520, and a second optocoupler U2.

The controlled terminal of the second switch circuit 510 is electrically connected to the electric screwdriver body 100, the input terminal of the second switch circuit 510 is used for accessing a power supply voltage, the output terminal of the second switch circuit 510 is grounded, and the second switch circuit 510 is used for switching on/off a path between the input terminal and the output terminal according to a third voltage signal.

The controlled end of the third switching circuit 520 is electrically connected to the electric screwdriver body 100, the input end of the third switching circuit 520 is used for accessing a power supply voltage, the input end of the third switching circuit 520 is further connected to the input end of the second switching circuit 510, the output end of the third switching circuit 520 is connected to the second optical coupler U2, and the third switching circuit 520 is used for switching on/off a path between the input end and the output end according to a fourth voltage signal.

The output of the second optocoupler U2 is connected to an input of the output device 400.

When the electric screwdriver body 100 outputs the third voltage signal as a high voltage, the second switch circuit 510 turns on a path between the input terminal and the output terminal, the power supply voltage is connected to the ground through the second switch circuit 510, no voltage is input into the third switch circuit 520, and at this time, no signal is output from the second optical coupler U2 no matter what voltage signal the fourth voltage signal is.

When the electric screwdriver body 100 outputs the third voltage signal as a low voltage, the second switching circuit 510 disconnects the path between the input terminal and the output terminal, and the power supply voltage is input from the input terminal of the third switching circuit 520. At this time, if the fourth voltage signal is a high voltage, the third switching circuit 520 switches on a path between the input terminal and the output terminal thereof, the power supply voltage is input to the second optical coupler U2 through the third switching circuit 520, both pins of the output terminal of the second optical coupler U2 are short-circuited, and a started signal is output; if the fourth voltage signal is a low voltage, the third switch circuit 520 disconnects the path between the input terminal and the output terminal, no voltage is input to the second optical coupler U2, both terminals of the output terminal of the second optical coupler U2 are open, and no signal is output.

In the present embodiment, the second switch circuit 510, the third switch circuit 520 and the second optical coupler U2 form the start output circuit 500, and when the electric screwdriver is started, the corresponding start signal is output, so that the structure is simple. The user can more intuitively acquire the state information of the electric screwdriver by outputting the corresponding start information through the output device 400.

In an embodiment, the second switch circuit 510 includes a second switch tube Q2, a third capacitor C3 and a fourth capacitor C4.

The controlled end of the second switch tube Q2 is electrically connected to the electric screwdriver body 100, the input end of the second switch tube Q2 is used for accessing a power supply voltage, the output end of the second switch tube Q2 is grounded, and the second switch tube Q2 is used for disconnecting a path between the input end and the output end according to a third voltage signal.

The third capacitor C3 is connected in parallel to the controlled end and the output end of the second switch tube Q2, and the fourth capacitor C4 is connected in parallel to the input end and the output end of the second switch tube Q2. The third capacitor C3 is used for filtering a third voltage signal output by the electric screwdriver body 100, and the fourth capacitor C4 is used for filtering a power supply voltage.

When the electric screwdriver body 100 outputs the third voltage signal as a high voltage, the second switching tube Q2 connects the path between the input end and the output end, and the power supply voltage is connected to the ground through the second switching tube Q2.

When the electric screwdriver main body 100 outputs the third voltage signal as a low voltage, the second switching tube Q2 disconnects the path between the input terminal and the output terminal, and the power supply voltage is input to the input terminal of the third switching circuit 520.

In the above embodiment, the second switch Q2 may be an NPN transistor or an MOS transistor.

In an embodiment, the third switching circuit 520 includes a third switching tube Q3, a fifth capacitor C5 and a sixth capacitor C6.

The controlled end of the third switching tube Q3 is electrically connected to the electric screwdriver body 100, the input end of the third switching tube Q3 is used for accessing a power supply voltage, the input end of the third switching tube Q3 is further connected to the input end of the first switching tube Q1, the output end of the third switching tube Q3 is grounded, and the third switching tube Q3 is used for switching on a path between the input end and the output end according to a fourth voltage signal.

The fifth capacitor C5 is connected in parallel to the controlled terminal and the output terminal of the third switching tube Q3, and the sixth capacitor C6 is connected in parallel to the input terminal and the output terminal of the third switching tube Q3. The fifth capacitor C5 is used for filtering the third voltage signal output by the electric screwdriver body 100, and the sixth capacitor C6 is used for filtering the power supply voltage.

When the second switch Q2 is turned on, no voltage is input to the third switch circuit 520, and no signal is output from the second optical coupler U2 no matter what the fourth voltage signal is.

When the second switch tube Q2 is in an off state, if the fourth voltage signal is a high voltage, the third switch tube Q3 connects a path between the input end and the output end thereof, the power supply voltage is input into the second optical coupler U2 through the third switch tube Q3, two pins of the output end of the second optical coupler U2 are short-circuited, and a started signal is output; if the fourth voltage signal is low voltage, the third switching tube Q3 disconnects the path between the input end and the output end, no voltage is input into the second optical coupler U2, two pins of the output end of the second optical coupler U2 are open, and no signal is output.

In the above embodiment, the third switching transistor Q3 may be an NPN transistor or an MOS transistor.

In one embodiment, the electric screwdriver further comprises an interference filtering circuit.

The input end of the interference filtering circuit is electrically connected with the detection device 200, the first output end of the interference filtering circuit is connected with the input end of the signal output circuit 300, the second output end of the interference filtering circuit is connected with the input end of the start output circuit 500, and the interference filtering circuit is used for filtering the interference voltage signal output by the detection device 200.

When the detection device 200 detects, factors such as environment and circuit connection may cause the detection device 200 to output invalid interference signals, which affects the normal output of the signal output circuit 300 and the start output circuit 500. The interference filtering circuit filters the interference signals, so that the output voltage is more stable.

Referring to fig. 6, in an embodiment, the electric screwdriver further includes a voltage reduction circuit;

the input end of the voltage reduction circuit is used for being connected with a power supply, the output end of the voltage reduction circuit is respectively connected with the signal output circuit 300 and the starting output circuit 500, and the voltage reduction circuit is used for reducing the voltage of the power supply voltage and then outputting the power supply voltage.

In one embodiment, the output device 400 is a display output device 400 and/or a voice output device.

In the above embodiments, the output device 400 may be a display screen, a nixie tube, an indicator light, or a speaker.

In the above embodiments, the output device 400 may also be used for counting. The output device 400 can count the number of screwing times by detecting the number of short circuits at the output end of the first optical coupler U1 output by the signal output circuit 300. The output device 400 can count the number of times of starting the electric screwdriver by detecting the number of times of short circuit of the output end of the second optical coupler U2 output by the starting output circuit 500.

According to the embodiment, the screw tightening state information and the starting state information of the electric screwdriver are output through the display device and/or the voice output device, so that a user can know whether the screw is tightened or not more intuitively, and the screw can be processed in time when the screw is not tightened. The problem that whether the electric screwdriver is screwed up or not cannot be intuitively known when the electric screwdriver is used for screwing up the screws is solved, and the operation efficiency is improved.

The following will explain the specific principles of the present invention with reference to the accompanying drawings:

when the torque value of the electric screwdriver body 100 reaches the preset torque value, the electric screwdriver body 100 pushes out the magnet 210, the magnetic induction component 220 detects the change of the magnetic field, and outputs 0V voltage to the first switching tube Q1. The first switch tube Q1 disconnects the path from the input end to the output end, so that the power supply voltage is input into the first optical coupler U1, and two pins of the output end of the first optical coupler U1 are short-circuited. The output device 400 detects the short circuit between the two pins of the output end of the first optical coupler U1, and displays the screw tightening information through the display device and/or outputs the screw tightening information through the voice output device.

When the torque value of the electric screwdriver body 100 is less than the preset torque value, the magnet 210 has no displacement, and the magnetic induction component 220 outputs a 5V voltage signal to the first switch tube Q1. The first switch tube Q1 connects the path from the input end to the output end, so that the power supply voltage is output to the ground through the first switch tube Q1, and two feet of the output end of the first optical coupler U1 are disconnected. The output device 400 detects that the two pins of the output end of the first optical coupler U1 are disconnected, and displays the screw tightening information and/or the voice output device outputs the information that the screws are not tightened through the display device.

The utility model discloses the screw that can't acquire directly perceivedly screws up state information and converts the torsion information that is convenient for detect into, whether reach through confirming the torsion value and predetermine the torsion value and can confirm whether screw up. The problem of electric screwdriver can't know directly perceivedly whether the screw is tightened when screwing the screw is solved, effectively improve the operating efficiency.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An electric screwdriver, characterized in that it comprises:

an electric screwdriver body;

2. The electric screwdriver of claim 1, wherein said signal output circuit comprises a first switching circuit and a first optocoupler;

3. The electric screwdriver as claimed in claim 2, wherein the first switching circuit comprises a first switching tube, a first capacitor and a second capacitor;

4. The power screwdriver of claim 3, further comprising an actuation output circuit;

the electric screwdriver main body is further used for outputting a third voltage signal and a fourth voltage signal when being started, the starting output circuit is used for outputting corresponding starting signals according to the third voltage signal and the fourth voltage signal, and the output device is further used for outputting corresponding starting information according to the starting signals.

5. The power screwdriver of claim 4, wherein said start output circuit comprises a second switching circuit, a third switching circuit, and a second optocoupler;

6. The electric screwdriver as claimed in claim 5, wherein the second switching circuit comprises a second switching tube, a third capacitor and a fourth capacitor;

7. The electric screwdriver according to claim 5, wherein the third switching circuit comprises a third switching tube, a fifth capacitor and a sixth capacitor;

8. The power screwdriver as defined in claim 4, further comprising an interference rejection circuit;

9. The electric screwdriver of claim 4, further comprising a voltage reduction circuit;

10. The electric screwdriver according to claim 1, wherein said output means is a display output means and/or a voice output means.