An electric power wrench and a method of using the same

Abstract

The application relates to the technical field of electric tools, in particular to an electric wrench and a use method thereof, the electric wrench comprising: a first PCB plate arranged on an inner wall of a shell of the electric wrench and close to an output end of a transmission part; a plurality of first metal contacts are arranged on a side of the first PCB plate away from the output end of the transmission part; and the plurality of first metal contacts are connected with a plurality of protected ports and a common ground port one by one through wires. The application increases a conductive part in the electric wrench according to the operation characteristics of the electric wrench, and the first metal contacts or the second metal contacts on the conductive part are contacted by moving the conductive part, so that the switch of the electric wrench is closed or opened, the instantaneous balance of high voltage is realized when the switch is opened, and each protected port in the device is protected from high-voltage damage, so that the ESD device is replaced, and the number of ESD devices, the occupied space of the devices and the production cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and in particular to an electric wrench and its method of use. Background Technology

[0002] Loose nuts on high-voltage power lines are a common defect during power grid transmission line maintenance. Often, live-line maintenance is required to correct these issues. Existing electric wrenches cannot meet the voltage requirements, so manual wrenches are generally used for this purpose.

[0003] In existing technologies, ESD devices utilize the reverse breakdown principle of PN junctions to conduct high-voltage pulses of static electricity to ground, thereby protecting the static-sensitive components inside electrical appliances.

[0004] However, in practical applications, existing electric wrenches have a slow response speed under high-voltage impact, which can easily damage the protected ports; increasing the withstand voltage level requires the use of more ESD devices, which takes up more circuit board space; ESD devices can withstand relatively low current, making them unsuitable for high-power discharge; and using more ESD devices will significantly increase hardware costs. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an electric wrench and a method of using the same.

[0006] In a first aspect, embodiments of the present invention provide an electric wrench, the electric wrench comprising:

[0007] The first PCB board is located on the inner wall of the electric wrench housing near the output end of the transmission component; the first PCB board has multiple first metal contacts on the side away from the output end of the transmission component, and the multiple first metal contacts are connected to multiple ports to be protected and a common ground port one by one through wires.

[0008] The second PCB board is located on the inner wall of the housing near the power input end of the transmission component and is arranged parallel to the first PCB board; a second metal contact is provided on the side of the second PCB board near the first PCB board, and the second metal contact is connected to the switch port of the electric wrench.

[0009] A conductive component is disposed between the first PCB board and the second PCB board, and metal contacts are provided on both ends of the component, which correspond one-to-one with the first metal contacts on the first PCB board and the second metal contacts on the second PCB board.

[0010] The conductive component moves along the axis of the transmission component to make the metal contact contact the first metal contact or the second metal contact, so as to turn the electric wrench on or off.

[0011] In conjunction with the first aspect, the electric wrench also includes:

[0012] A reset component, located on the transmission component, is used to push the conductive component to reset when the electric wrench is stopped, so that the metal contacts on the conductive component disengage from the second metal contacts, thereby turning off the electric wrench switch.

[0013] In conjunction with the first aspect, the electric wrench also includes:

[0014] A limiting component is provided on the outer wall of the transmission component. The limiting component includes two limiting members, which are located on both sides of the conductive component and are coaxial with the transmission component. The limiting members are used to limit the movement stroke of the conductive component.

[0015] In conjunction with the first aspect, the conductive component is a metal disc, and a first through hole is provided on the conductive component. The inner wall of the first through hole is larger than the outer diameter of the transmission component and smaller than the outer diameter of the limiting component; the axis of the first through hole coincides with the axis of the transmission component.

[0016] In conjunction with the first aspect, the electric wrench also includes:

[0017] The first fixing component is located inside the housing near the power output end;

[0018] The second fixing member is located inside the housing near the power input end;

[0019] The guide rail is connected at one end to the first fixing member and at the other end to the second fixing member;

[0020] A second through hole is provided on the conductive component, and a guide rail passes through the second through hole, allowing the conductive component to move along the guide rail.

[0021] In conjunction with the first aspect, there are at least two guide rails, and the at least two guide rails are arranged equidistantly in the circumferential direction.

[0022] In conjunction with the first aspect, the electric wrench also includes:

[0023] A sleeve is detachably connected to the power output end of a transmission component; the sleeve is used to tighten nuts when the transmission component rotates.

[0024] In conjunction with the first aspect, the electric wrench also includes:

[0025] The main control chip includes multiple protected ports and a common ground port, which are electrically connected to multiple first metal contacts one by one. The main control chip also includes a switch port, which is electrically connected to two second metal contacts one by one.

[0026] Secondly, this application provides a method for using an electric wrench, wherein a socket is connected to the power output end of the electric wrench, and the method includes:

[0027] The socket of the portable electric wrench is close to the nut;

[0028] Press the electric wrench to make the socket fit tightly against the nut;

[0029] The electric wrench is pushed by pressure to move the conductive component along the axis of the transmission component, so that the metal contact on the conductive component makes contact with the second metal contact.

[0030] Connect the circuit of the switch to turn on the electric wrench and disconnect the port to be protected from the common ground port.

[0031] In conjunction with the second aspect, the electric wrench also includes a reset assembly; the method includes:

[0032] After the nut is tightened, separate the sleeve from the nut. The reset assembly pushes the conductive part to reset, thereby turning off the electric wrench switch.

[0033] The embodiments of the present invention bring the following beneficial effects: Based on the electric wrench and its usage method, this application adds a conductive component to the electric wrench in combination with the operating characteristics of the electric wrench. By moving the conductive component, the first metal contact or the second metal contact on the conductive component is brought into contact to turn the switch of the electric wrench on or off, so as to achieve instantaneous high voltage equalization when the switch is turned on, thereby protecting each port to be protected in the device from high voltage damage, replacing ESD devices, thereby reducing the number of ESD devices, the space occupied by the devices, and the production cost.

[0034] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 A schematic diagram of an electric wrench provided in an embodiment of the present invention;

[0038] Figure 2A schematic diagram of a circular bidirectional switch consisting of an electric wrench conductor, a first metal contact, and a second metal contact, provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the control chip inside an electric wrench provided in an embodiment of the present invention.

[0040] Figure label:

[0041] 1-First PCB board, 2-Second PCB board, 3-Conductive component, 4-Reset assembly, 5-Transmission component, 6-Housing, 7-First pressure plate, 8-Limiting component, 9-First fixing component, 10-Guide rail, 11-Sleeve. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, 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 those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] To facilitate understanding of this embodiment, the technical terms used in this application will be briefly introduced below.

[0044] ESD stands for electrostatic discharge, which occurs due to triboelectric charging (friction between materials) or electrostatic induction. Essentially, ESD transistors and TVS diodes operate on the same principle, but they differ in power rating, application, and packaging. ESD transistors are primarily used for electrostatic protection and require low capacitance values, while TVS transistors have relatively high capacitance values.

[0045] TVS is a high-efficiency protection device in the form of a diode. When the two poles of a TVS diode are subjected to a reverse transient high-energy impact, it can change the high impedance between the two poles to a low return impedance at a speed on the order of 10 to the power of -12 seconds, absorbing surge power of up to several kilowatts, clamping the voltage between the two poles to a predetermined value, effectively protecting the precision components in electronic circuits, and playing the role of TVS transient voltage suppression.

[0046] After introducing the technical terms used in this application, the application scenarios and design concepts of the embodiments of this application will be briefly described below.

[0047] Existing electric wrenches have a slow response speed under high-voltage impact, which can easily damage the protected ports. Increasing the withstand voltage level requires the use of more ESD devices, which takes up more circuit board space. ESD devices can only withstand a small current, making them unsuitable for high-power discharge. Using more ESD devices will significantly increase hardware costs.

[0048] Based on this, this application provides an electric wrench and a method for using it.

[0049] Example 1

[0050] This application provides an electric wrench, combined with Figure 1 As shown, the electric wrench includes: a first PCB board 1, a second PCB board 2, and a conductive component 3.

[0051] The first PCB board 1 is located on the inner wall of the housing 6 of the electric wrench, near the power output end of the transmission component 5; the first PCB board 1 is provided with multiple first metal contacts on the side away from the output end of the transmission component, and the multiple first metal contacts are connected one by one to the multiple protected ports and the common ground port of the control chip through wires.

[0052] The second PCB board 2 is located on the inner wall of the housing 6 near the power input end of the transmission component 5 and is arranged parallel to the first PCB board 1; a second metal contact is provided on the side of the second PCB board 2 near the first PCB board 1, and the second metal contact is connected to the switch port of the electric wrench.

[0053] Conductive component 3 is disposed between the first PCB board 1 and the second PCB board 2, and has metal contacts on both ends, which correspond one-to-one with the first metal contacts on the first PCB board 1 and the second metal contacts on the second PCB board 2 (in conjunction with...). Figure 2 (as shown);

[0054] The conductive element 3 moves along the axis of the transmission element 5 to make the metal contact contact the first metal contact or the second metal contact, so as to turn the electric wrench on or off.

[0055] In this application, when the electric wrench is not in operation, the metal contacts on the conductive element 3 are in contact with the first metal contacts on the first PCB board 1 to connect each protected port and the grounding port, thus short-circuiting the protected port and the common grounding port. When the electric wrench is in operation, the conductive element 3 moves along the axis of the transmission element 5, disconnecting from the first metal contact and contacting the second metal contact to open the electric wrench. By adding a connection mechanism between the protected port and the common grounding terminal, instantaneous high voltage equalization is achieved, thereby protecting each protected port from high voltage damage. Compared to the prior art which requires a large number of ESD devices, this reduces the number of devices, thereby reducing space occupation and production costs.

[0056] Combination Figure 1 As shown, the power input terminal of the transmission component 5 is connected to a drive motor. In this application, the drive motor is a DC motor. The drive motor is electrically connected to the control chip of the electric wrench. When the switch port of the control chip is turned on, the drive motor is started to drive the transmission component 5 to rotate.

[0057] Combination Figure 1 As shown, the first PCB board 1 and the second PCB board 2 are two parallel circular plates. Holes for the transmission component 5 to pass through are formed on the first PCB board 1 and the second PCB board 2. The inner diameter of the hole is larger than the outer diameter of the transmission component 5. The difference between the inner diameter of the hole and the outer diameter of the transmission component 5 can be set according to the actual working conditions. The inner diameter of the hole being larger than the outer diameter of the transmission component 5 can avoid affecting the rotation of the transmission component 5. The first PCB board 1 and the second PCB board 2 are fixedly mounted on the inner wall of the electric wrench housing 6. As an feasible approach, the first PCB board 1 and the second PCB board 2 are integrally formed with the electric wrench housing 6 during manufacturing, resulting in better stability of the integrated structure.

[0058] As another feasible approach, the first metal contacts on the first PCB board 1 are first electrically connected to each of the protected ports and the common ground port of the control chip, and the second metal contacts on the second PCB board 2 are first electrically connected to the switch ports of the control chip. Then, the first PCB board 1 and the second PCB board 2 are fixed to the inner wall of the housing 6 by means of connectors, for example, by means of pins.

[0059] In conjunction with the first aspect, the electric wrench also includes a limit assembly.

[0060] Combination Figure 1 As shown, the limiting component is located on the outer wall of the transmission component 5. The limiting component includes two limiting members 8, which are located on both sides of the conductive component 3. The limiting members 8 are coaxial with the transmission component 5 and are used to limit the movement stroke of the conductive component.

[0061] In this embodiment, the limiting component is fixedly mounted on the outer wall of the transmission member 5, rotates with the transmission member 5, and generates a lateral displacement along the axis of the transmission member 5 during rotation. Figure 1 As shown, the limiting assembly includes two limiting members 8, which are located on both sides of the conductive member 3. As the transmission member 5 rotates, the limiting member 8 rotates, and one of the limiting members 8 contacts the conductive member 3. When the rotation continues, it can push the conductive member 3 in one direction.

[0062] For example, the limiting member 8 located near the power output end can push the conductive member 3 from the power output end to the power input end of the transmission member 5 as the transmission member 5 rotates; similarly, the limiting plate located near the power input end can push the conductive member 3 from the power input end to the power output end as the transmission member 5 rotates, thereby realizing the movement of the conductive member 3 along the axis of the transmission member 5.

[0063] In conjunction with the first aspect, the electric wrench also includes: a reset assembly 4.

[0064] The reset component 4 is located on the transmission component 5 and is used to push the conductive component 3 to reset when the electric wrench is stopped, so that the metal contacts on the conductive component 3 are disengaged from the second metal contacts, thereby turning off the electric wrench switch.

[0065] Combination Figure 1 As shown, in the working state, the reset component 4 is squeezed. In the non-working state, the reset component pushes the conductive part 3 to reset, so that the conductive part 3 is away from the second PCB board. The contact between the metal contact on the conductive part 3 and the second metal contact is broken, and the electric wrench switch is turned off.

[0066] In this embodiment, the reset component is a spring, which is sleeved on the outside of the transmission component 5. One end of the spring is fixedly connected to the inner wall of the housing 6 and close to the power input end of the transmission component 5, and the other end is fixedly connected to the first pressure plate 7 fixed on the transmission component 5. In the initial state, the conductive element 3 is in contact with the first PCB board 1 to short-circuit each protected port with the common ground terminal, and the spring is in the initial state. When the drive motor is running, the drive transmission element 5 rotates, thereby driving the first pressure plate 7 to rotate. At this time, the spring is compressed and deformed. As the transmission element 5 rotates, the limiting element on the transmission element 5 is displaced, pushing the conductive element 3 to move along the axis of the transmission element 5 to disengage from the first PCB board 1, so that the metal contacts on the conductive element 3 are connected one-to-one with the second metal contacts on the second PCB board 2, thereby opening the electric wrench switch. When the drive motor stops running, the spring pushes the first pressure plate 7 to reset under the action of elastic force, thereby driving the transmission element 5 and the conductive element 3 to reset, so that the conductive element 3 is disengaged from the second PCB board 2, closing the electric wrench switch, and resetting to connect with the first PCB board 1, so that the metal contacts on the conductive element 3 are connected one-to-one with the first metal contacts.

[0067] Combination Figure 1 As shown, in this embodiment, the conductive component 3 is a metal disk, and a first through hole is provided on the conductive component 3. The inner wall of the first through hole is larger than the outer diameter of the transmission component 5 and smaller than the outer diameter of the limiting component 8; the axis of the first through hole coincides with the axis of the transmission component 5.

[0068] In this way, when the limiting member 8 rotates with the transmission member 5 and comes into contact with the conductive member 3, it will not pass through the first through hole in the middle of the conductive member 3, but will push the conductive member 3 to move.

[0069] In conjunction with the first aspect, the electric wrench also includes: a first fixing member 9, a second fixing member (not shown in the figure), and a guide rail 10.

[0070] The first fixing member 9 is located inside the housing 6 near the power output end.

[0071] The second fixing member is located inside the housing 6 near the power input end.

[0072] One end of the guide rail 10 is connected to the first fixing member 9, and the other end is connected to the second fixing member.

[0073] The conductive component 3 has a second through hole, and the guide rail 10 passes through the second through hole, allowing the conductive component 3 to move along the guide rail 10.

[0074] The transmission component 5 passes through the first through hole on the conductive component 3. Under the action of gravity, the inner wall of the first through hole of the conductive component 3 will contact the outer wall of the transmission component 5. Thus, when the transmission component 5 rotates, it will inevitably drive the conductive component 3 to rotate as well. Therefore, it is impossible to guarantee the precise contact between the metal contacts on the conductive component 3 and the first or second metal contacts. Therefore, the second through hole on the conductive component 3 is slidably connected to the guide rail. In this way, the inner wall of the conductive component 3 will never contact the outer wall of the transmission component 5 and will not rotate with the rotation of the transmission component 5. Instead, when the transmission component 5 rotates, it will drive the limiting component 8 to rotate and generate displacement, so as to push the conductive component 3 to run along the guide rail. Since its direction of movement coincides with the axial direction of the transmission component 5 and there is no offset or rotation, there will be no offset when it contacts the first or second metal point, so precise contact can be achieved to conduct the circuit connection with the target metal point.

[0075] In conjunction with the first aspect, there are at least two guide rails 10, and the at least two guide rails 10 are arranged equidistantly in the circumferential direction.

[0076] In this way, the force can be evenly distributed by axially equidistant arrangement, and the center of gravity of the conductive component 3 will not shift. As the number of guide rails 10 increases, the number of corresponding second through holes on the conductive component 3 also increases. Without affecting the arrangement of metal contacts, the structural stability is better as the number of guide rails 10 increases.

[0077] Combination Figure 1 As shown, in this embodiment, the conductive component 3 is a metal disk, specifically a copper metal disk. Fixed circular PCBs, namely a first PCB board 1 and a second PCB board 2, are designed on the front and rear sides of this copper metal disk. Contacts are provided on the first PCB board 1 and the second PCB board 2. The first metal contact on the first PCB board 1 is connected to the protected port and the common ground port on the electric wrench control chip via wires. There can be one or more ports to be protected. The second metal contact on the second PCB board 2 is connected to the switch port on the main control chip. When the first or second metal contact is not in contact with the metal contact on the copper metal disk, there is no electrical connection between the first metal contact PCBs, and the second metal contacts are also not interconnected. When the first or second metal contact is in contact with the metal contact on the copper metal disk, there is electrical connection between the first metal contact PCBs and the second metal contacts.

[0078] In this application, the electric wrench transmission component 5 is equipped with a reset assembly 4, specifically a spring. The transmission component 5 can move back and forth under the influence of the spring and external force. The transmission component 5 passes through the first through hole in the center of the copper metal disc. Limiting components are provided on both sides of the copper metal disc to ensure that the copper metal disc can move back and forth with the transmission component 5. Two guide rails 10 are designed on the upper and lower parts of the disc to ensure that the copper metal disc does not rotate with the transmission component 5 and is aligned with the contacts on the first and second metal contacts. The two end faces of the copper metal disc are provided with 1.5mm high protrusions as metal contacts. The metal contacts on one end face are interconnected and can reliably contact the first or second metal contact by moving back and forth.

[0079] In traditional designs, a TVS diode is used to connect the port to the common ground terminal. When there is no high voltage, the TVS device is in an open state, and the chip operates normally. When high voltage is applied, the TVS device is in a conducting state, and the power tool is in a high-voltage protection state, unable to work but not damaged.

[0080] In this application, the TVS device is removed, and the port to be protected and the common ground terminal are connected to multiple first metal contacts one by one through wires. The switch port of the control chip is also connected to the second metal contacts one by one. The forward and backward movement of the power tool transmission component 5 causes the conductive component 3 to contact the first or second metal contacts, thereby realizing the switching action of the TVS device and achieving the same protection purpose.

[0081] Specifically, when the electric wrench contacts the high-voltage nut, the high voltage is evenly conducted to the protected port and the common ground port of the device through the conductive component 3 and the second metal contact, achieving voltage equalization. Because there is no voltage difference, the protected port will not be damaged.

[0082] In conjunction with the first aspect, the electric wrench also includes a socket 11.

[0083] Sleeve 11 is detachably connected to the power output end of transmission component 5; sleeve 11 is used to tighten the nut when transmission component 5 rotates.

[0084] Select the corresponding socket 11 according to the different models of nuts to be tightened. If the socket 11 currently in use is not suitable, disassemble the current socket and replace it with a new socket 11. This is a conventional technical method and will not be elaborated here.

[0085] In conjunction with the first aspect, the electric wrench also includes: a main control chip.

[0086] Combination Figure 3As shown, the main control chip includes 32 ports, including multiple ports to be protected (such as ports 9, 13, and 14) and a common ground port (such as port 32). The multiple ports to be protected and the common ground port are electrically connected to multiple first metal contacts one by one.

[0087] Secondly, this application provides a method for using an electric wrench, wherein a socket is connected to the power output end of the electric wrench, and the method includes:

[0088] S110, the socket of the moving electric wrench is close to the nut;

[0089] S120, Press the electric wrench to make the socket and nut fit tightly together;

[0090] S130, the electric wrench is pushed by pressure to move the conductive part along the axis of the transmission part, so that the metal contact on the conductive part contacts the second metal contact.

[0091] S140, connects the circuit of the switch for the electric wrench and disconnects the port to be protected from the common ground port.

[0092] In actual use, the electric wrench needs to tighten the nut. To ensure that the socket 11 and the nut can fit tightly and the nut will not come out of the socket, the electric wrench needs to be pressed in the direction of the nut so that the socket and the nut fit tightly. During the pressing process, the output end of the transmission component 5 connected to the socket 11 rotates under pressure, which drives the limit component to move, thereby pushing the conductive component 3 (a copper metal disc in this application) to move to the second metal contact on the second PCB board 2. When the metal contact on the conductive component 3 contacts the second metal contact, the switch of the electric wrench is turned on, the electric tool starts normally to tighten the nut, and disengages from the first metal contact, disconnecting the port to be protected from the common ground port.

[0093] In conjunction with the second aspect, the electric wrench also includes a reset assembly 4; the method includes:

[0094] S150, after the nut is tightened, separate the sleeve from the nut, and the reset assembly pushes the conductive part to reset, thereby turning off the electric wrench switch.

[0095] Once the nut is tightened, the sleeve 11 separates from the nut, the reset assembly 4 returns to its initial state, and the conductive element 3 (in this embodiment, a copper metal disc) contacts the first metal contact on the first PCB board 1 and disengages from the second metal contact on the second PCB board 2, thus closing the electric wrench switch. This method utilizes the movement of the transmission component during the operation of the electric wrench to move the conductive element 3, thereby switching between high-voltage impact protection and normal operation. It can withstand high voltage and high current without any response time lag, achieving reliable protection for voltages of 220KV and below.

[0096] When the electric wrench is not in operation, the reset assembly 4 behind the transmission component 5 pushes the conductive component 3 (a copper metal disc in this embodiment) towards the power output end. The copper metal disc contacts the first metal contact, making all the first metal contacts on the first PCB board 1 conductive, and the protected port of the control chip is short-circuited to the common ground potential. When the power tool is performing high-voltage operation, the electric wrench first contacts the high-voltage nut. The high voltage can be evenly conducted to the protected port and the common ground terminal of the device through the conductive component 3 and the second metal contact, achieving voltage balance. Thus, the protected port and the common ground terminal are connected to the first PCB board 1 through wires, corresponding one-to-one with multiple first metal contacts. The forward and backward movement of the power tool transmission component 5 drives the limit assembly to move, thereby pushing the conductive component 3 to achieve the switching action of the TVS device and achieve the same protection purpose.

[0097] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0098] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An electric wrench, characterized in that, The electric wrench includes: The first PCB board is located on the inner wall of the electric wrench housing near the output end of the transmission component; the first PCB board has multiple first metal contacts on the side away from the output end of the transmission component, and the multiple first metal contacts are connected to multiple ports to be protected and a common ground port one by one through wires. The second PCB board is located on the inner wall of the housing near the power input end of the transmission component and is arranged parallel to the first PCB board; a second metal contact is provided on the side of the second PCB board near the first PCB board, and the second metal contact is connected to the switch port of the electric wrench. A conductive component is disposed between the first PCB board and the second PCB board, and metal contacts are provided on both ends of the component, which correspond one-to-one with the first metal contacts on the first PCB board and the second metal contacts on the second PCB board. The conductive element moves along the axial direction of the transmission element to make the metal contact contact the first metal contact or the second metal contact, so as to turn the electric wrench on or off.

2. The electric wrench according to claim 1, characterized in that, Also includes: A reset component, disposed on the transmission member, is used to push the conductive member to reset when the electric wrench is stopped, so that the metal contact on the conductive member disengages from the second metal contact, thereby turning off the electric wrench switch.

3. The electric wrench according to claim 1, characterized in that, Also includes: A limiting component is provided on the outer wall of the transmission member. The limiting component includes two limiting members, which are provided on both sides of the conductive member and are coaxial with the transmission member. The limiting members are used to limit the movement stroke of the conductive member.

4. The electric wrench according to claim 3, characterized in that, The conductive component is a metal disc, and a first through hole is formed on the conductive component. The inner wall of the first through hole is larger than the outer diameter of the transmission component and smaller than the outer diameter of the limiting component. The axis of the first through hole coincides with the axis of the transmission component.

5. The electric wrench according to claim 4, characterized in that, Also includes: The first fixing member is located inside the housing near the power output end; The second fixing member is located inside the housing near the power input end; The guide rail is connected at one end to the first fixing member and at the other end to the second fixing member; The conductive component has a second through hole, the guide rail passes through the second through hole, and the conductive component can move along the guide rail.

6. The electric wrench according to claim 5, characterized in that, There are at least two guide rails, and the at least two guide rails are arranged at equal intervals around the circumference.

7. The electric wrench according to claim 1, characterized in that, Also includes: A sleeve is detachably connected to the power output end of the transmission component; the sleeve is used to tighten the nut when the transmission component rotates.

8. The electric wrench according to claim 1, characterized in that, Also includes: The main control chip includes multiple protected ports and a common ground port, each of which is electrically connected to a plurality of first metal contacts. The main control chip also includes a switch port, which is electrically connected to two second metal contacts.

9. A method of using an electric wrench as described in any one of claims 1-8, characterized in that, The power output end of the electric wrench is connected to a socket, and the method includes: Move the sleeve of the electric wrench closer to the nut; Press the electric wrench to make the socket fit tightly against the nut; The electric wrench is pushed by pressure to move the conductive component along the axis of the transmission component, so that the metal contact on the conductive component comes into contact with the second metal contact. Turn on the circuit connection of the switch of the electric wrench and disconnect the port to be protected from the common ground port.

10. The method according to claim 9, characterized in that, The electric wrench also includes a reset component; the method includes: After the nut is tightened, the sleeve is separated from the nut, and the reset assembly pushes the conductive element to reset, thereby turning off the switch of the electric wrench.

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