Electronic torque wrench with lever structure

Abstract

The utility model discloses a kind of electronic force-limiting torque wrenches with lever structure, including input lever, force handle, handle, force reduction mechanism, stop block, tripping lever and stop lever, the input lever is connected with the force handle, the force reduction mechanism is set between the stop lever and the input lever and force reduction mechanism is used to transmit torque between stop lever and input lever, input lever is rotatably connected with the handle by first pivot, stop lever is rotatably connected with handle by second pivot, the stop block is rotatably connected with handle by third pivot, tripping lever is rotatably connected with handle by fourth pivot, stop block is set between tripping lever and stop lever.The utility model electronic force-limiting torque wrench with lever structure, input lever is fixed on force handle, unloading pivot is close to force point, the force on input lever is smaller, reduces the contact stress at lever contact point, reduces contact point abrasion, and can improve wrench service life.

Description

Technical Field

[0001] This utility model belongs to the field of wrench technology. Specifically, this utility model relates to an electronic torque limiting wrench with a lever structure. Background Technology

[0002] Existing electronic torque limiters with lever structures have an input lever and elastic element integrated, a load-relieving shaft located at the wrench head, and a force-applying handle integrated with the wrench body or a fixed, non-movable structure, such as... Figure 5 As shown. Because the unloading shaft is located on the input lever and handle, which are integrated with the elastic element, and the input lever is connected to the wrench head, the unloading shaft is far from the force application point, which is located on the force application handle. During operation, the force acting on the input lever is large, which worsens the working conditions of the unloading mechanism. The contact stress at the lever contact point is large, which makes the lever contact point of the unloading mechanism prone to wear and affects the service life of the product.

[0003] Chinese Patent Application No. 202111650913.4 discloses a mechanical digital display torque wrench, characterized by comprising an elastic shaft assembly, a sleeve, and a guide sleeve. The elastic shaft assembly includes an elastic shaft and a strain gauge. The front end of the elastic shaft is rigidly connected to the wrench head, and the rear end of the elastic shaft is inserted into the front cavity of the sleeve and hinged thereto by a pin. The guide sleeve is inserted into the sleeve and forms a clearance fit with the inner wall of the sleeve. A release mechanism is installed in the guide sleeve. When the applied torque of the wrench reaches a set value, the release mechanism can cause the wrench to slip and simultaneously strike the sleeve to produce a sound. Electronic components for torque setting, display, audible and visual alarm, and control of the release mechanism are installed on the outer wall of the sleeve.

[0004] An improved electronic torque-limiting wrench with a lever structure is provided, particularly regarding how to increase its service life. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides an electronic torque-limiting wrench with a lever structure, the purpose of which is to improve its service life.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an electronic torque limiter with a lever structure, comprising an input lever, a force application handle, a handle portion, a lever reducing mechanism, a stop block, a release lever, and a stop lever. The input lever is connected to the force application handle. The lever reducing mechanism is disposed between the stop lever and the input lever and is used to transmit torque between the stop lever and the input lever. The input lever is rotatably connected to the handle portion via a first rotating shaft. The stop lever is rotatably connected to the handle portion via a second rotating shaft. The stop block is rotatably connected to the handle portion via a third rotating shaft. The release lever is rotatably connected to the handle portion via a fourth rotating shaft. The stop block is disposed between the release lever and the stop lever.

[0007] The lever reducing mechanism includes a reducing lever, and at least one reducing lever is provided. The reducing lever is located between the stop lever and the input lever, and the reducing lever is rotatably connected to the handle through a fifth rotating shaft.

[0008] An electric unloading mechanism is provided inside the handle. The electric unloading mechanism is connected to one end of the release lever, and the other end of the release lever is in contact with the stop block.

[0009] The electric unloading mechanism is an electromagnet or a motor.

[0010] The axes of the first rotating shaft, the second rotating shaft, the third rotating shaft, and the fourth rotating shaft are parallel.

[0011] This utility model also provides an electronic torque limiting wrench with a lever structure, including an input lever, a force application handle, a handle portion, a stop block, a release lever, and a stop lever. The input lever is connected to the force application handle, and the stop lever and the input lever transmit torque to each other. The input lever is rotatably connected to the handle portion via a first rotating shaft, the stop lever is rotatably connected to the handle portion via a second rotating shaft, the stop block is rotatably connected to the handle portion via a third rotating shaft, the release lever is rotatably connected to the handle portion via a fourth rotating shaft, and the stop block is disposed between the release lever and the stop lever.

[0012] An electric unloading mechanism is provided inside the handle. The electric unloading mechanism is connected to one end of the release lever, and the other end of the release lever is in contact with the stop block.

[0013] The electric unloading mechanism is an electromagnet or a motor.

[0014] The axes of the first rotating shaft, the second rotating shaft, the third rotating shaft, and the fourth rotating shaft are parallel.

[0015] This utility model is an electronic torque limiter with a lever structure. The input lever is fixed on the force application handle, and the force relief shaft is close to the force application point. The force acting on the input lever is smaller, which reduces the contact stress at the lever contact point, reduces contact point wear, and can improve the service life of the wrench. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 This is a schematic diagram of the electronic torque limiting wrench with a lever structure in Embodiment 1;

[0018] Figure 2 This is a partial structural schematic diagram of the electronic torque limiting wrench with a lever structure in Embodiment 1;

[0019] Figure 3 This is a schematic diagram of the electronic torque limiting wrench with a lever structure in Embodiment 2;

[0020] Figure 4 This is a partial structural schematic diagram of the electronic torque limiting wrench with a lever structure in Embodiment 2;

[0021] Figure 5 This is a schematic diagram of the structure of an existing electronic torque limiting wrench;

[0022] The following are labeled in the diagram: 1. Input lever; 2. Force application handle; 3. Handle; 4. Force reduction lever; 5. Stop block; 6. Release lever; 7. Stop lever; 8. Force relief shaft; 9. First shaft; 10. Electric force relief mechanism; 11. First return spring; 12. Contact point; 13. Elastic body; 14. Electronic display device; 15. Striking head; 16. Stop surface; 17. Arc surface; 18. Second return spring. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0024] It should be noted that in the following embodiments, the terms "first", "second", "third" and "fourth" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution, but are merely for the convenience of description.

[0025] Example 1

[0026] like Figure 1 and Figure 2As shown, this embodiment provides an electronic torque limiter with a lever structure, including an input lever 1, a force application handle 2, a handle 3, a lever reducing mechanism, a stop block 5, a trip lever 6, and a stop lever 7. The input lever 1 is connected to the force application handle 2. The lever reducing mechanism is disposed between the stop lever 7 and the input lever 1 and is used to transmit torque between the stop lever 7 and the input lever 1. The input lever 1 is rotatably connected to the handle 3 via a first rotating shaft 9. The stop lever 7 is rotatably connected to the handle 3 via a second rotating shaft. The stop block 5 is rotatably connected to the handle 3 via a third rotating shaft. The trip lever 6 is rotatably connected to the handle 3 via a fourth rotating shaft. The stop block 5 is disposed between the trip lever 6 and the stop lever 7.

[0027] Specifically, such as Figure 1 As shown, the handle 3 is a hollow tubular structure. An elastic element is installed within the inner cavity of the handle 3, which is used to mount the wrench head. The wrench head is located outside the handle 3, and strain gauges are mounted on the elastic element. The input lever 1, the force-applying handle 2, the handle 3, the lever reducing mechanism, the stop block 5, the release lever 6, and the stop lever 7 are located within the inner cavity of the handle 3. The axes of the first rotating shaft 9, the second rotating shaft, the third rotating shaft, and the fourth rotating shaft are parallel, and their axes are perpendicular to the length direction of the handle 3. One end of the input lever 1 is fixedly connected to the force-applying handle 2, which is located outside the handle 3. The handle 3 is located between the force-applying handle 2 and the wrench head.

[0028] like Figure 1 and Figure 2 As shown, a first return spring 11 is provided in the inner cavity of the handle 3. The first return spring 11 is used to apply an elastic force to the stop lever 7 to reset it. The first return spring 11 is a cylindrical helical spring and a compression spring. The first return spring 11 is sandwiched between the inner wall surface of the handle 3 and the stop lever 7.

[0029] like Figure 1 and Figure 2 As shown, a second return spring 18 is provided in the inner cavity of the handle 3. The second return spring 18 is used to apply an elastic force to the stop block 5 to reset it. The second return spring 18 is a cylindrical helical spring and a compression spring. The second return spring 18 is sandwiched between the inner wall surface of the handle 3 and the stop block 5.

[0030] like Figure 2 As shown, a stop surface 16 is provided on the end of the stop lever 7 facing the stop block 5, and an arc surface 17 and a contact surface are provided on the stop block 5. The contact surface is used to contact the end of the stop lever 7 when locked.

[0031] like Figure 1 and Figure 2As shown, the electronic torque limiter with lever structure in this embodiment also includes a lever reducing mechanism. The lever reducing mechanism includes a reducing lever 4, which is disposed between the stop lever 7 and the input lever 1. The reducing lever 4 is rotatably connected to the handle 3 through a fifth rotating shaft.

[0032] like Figure 1 and Figure 2 As shown, a reducing lever 4 is provided, which is a T-shaped planar block with steps at both ends. A stopping lever 7 is also a T-shaped block with steps at both ends, and a step at one end of the input lever 1. The steps at both ends of the reducing lever 4 contact the end steps of the stopping lever 7 and the end steps of the input lever 1, respectively. When the input lever 1 rotates, it drives the stopping lever 7 to rotate through the reducing lever 4, transmitting torque. A stopping block 5 cooperates with the stopping lever 7, locking the stopping lever 7 and preventing its rotation. The stopping block 5 is an L-shaped plate with an arc. The arc-shaped lower end face (i.e., the contact surface) of one end of the stopping block 5 contacts the planar line of one end of the stopping lever 7, and the other end of the stopping block 5 contacts the tripping lever 6. After the force is stopped, under the action of the spring force of the first return spring 11, the stop lever 7 rotates clockwise around the axis, pushing the stop block 5 to rotate counterclockwise. When the stop surface 16 of the stop lever 7 passes the arc surface 17 of the stop block 5, the contact surface between the stop lever 7 and the stop block 5 disengages, and then the stop block 5 can rotate clockwise to reset under the action of the spring force of the second return spring 18.

[0033] Multiple reducing levers 4 can be provided. All reducing levers 4 are arranged sequentially along the inner length of the handle 3 in the inner cavity of the handle 3. Each reducing lever 4 is rotatably connected to the handle 3 through a fifth rotating shaft. The axis of the fifth rotating shaft is parallel to the axis of the fourth rotating shaft. Steps are provided at both ends of the reducing lever 4, and the ends of two adjacent reducing levers 4 are in contact.

[0034] like Figure 1 and Figure 2 As shown, an electric unloading mechanism 10 is installed inside the handle 3. The electric unloading mechanism 10 is connected to one end of the trip lever 6, and the other end of the trip lever 6 is in contact with the stop block 5. The electric unloading mechanism 10 is used to control the rotation of the trip lever 6. The electric unloading mechanism 10 is an electromagnet or a motor. By controlling the rotation of the trip lever 6 through the electric unloading mechanism 10, the trip lever 6 drives the stop block 5 to rotate, so that the stop teeth can selectively engage and disengage with the stop lever 7.

[0035] Example 2

[0036] like Figure 3 and Figure 4As shown, this embodiment provides an electronic torque limiter with a lever structure, including an input lever 1, a force application handle 2, a handle 3, a stop block 5, a release lever 6, and a stop lever 7. The input lever 1 is connected to the force application handle 2, and the stop lever 7 and the input lever 1 transmit torque to each other. The input lever 1 is rotatably connected to the handle 3 via a first rotating shaft 9, the stop lever 7 is rotatably connected to the handle 3 via a second rotating shaft, the stop block 5 is rotatably connected to the handle 3 via a third rotating shaft, the release lever 6 is rotatably connected to the handle 3 via a fourth rotating shaft, and the stop block 5 is disposed between the release lever 6 and the stop lever 7.

[0037] Specifically, such as Figure 3 As shown, the handle 3 is a hollow tubular structure. An elastic element is installed within the inner cavity of the handle 3, which is used to mount the wrench head. The wrench head is located outside the handle 3, and strain gauges are mounted on the elastic element. The input lever 1, the force-applying handle 2, the handle 3, the stop block 5, the release lever 6, and the stop lever 7 are located within the inner cavity of the handle 3. The axes of the first, second, third, and fourth rotating shafts are parallel, and their axes are perpendicular to the length direction of the handle 3. One end of the input lever 1 is fixedly connected to the force-applying handle 2, which is located outside the handle 3. The handle 3 is located between the force-applying handle 2 and the wrench head.

[0038] like Figure 3 and Figure 4 As shown, a first return spring 11 is provided in the inner cavity of the handle 3. The first return spring 11 is used to apply an elastic force to the stop lever 7 to reset it. The first return spring 11 is a cylindrical helical spring and a compression spring. The first return spring 11 is sandwiched between the inner wall surface of the handle 3 and the stop lever 7.

[0039] like Figure 3 and Figure 4 As shown, a second return spring 18 is provided in the inner cavity of the handle 3. The second return spring 18 is used to apply an elastic force to the stop block 5 to reset it. The second return spring 18 is a cylindrical helical spring and a compression spring. The second return spring 18 is sandwiched between the inner wall surface of the handle 3 and the stop block 5.

[0040] like Figure 4 As shown, a stop surface 16 is provided on the end of the stop lever 7 facing the stop block 5, and an arc surface 17 and a contact surface are provided on the stop block 5. The contact surface is used to contact the end of the stop lever 7 when locked.

[0041] like Figure 3 and Figure 4As shown, the stop lever 7 is a T-shaped block with steps at both ends. One end of the input lever 1 also has a step. The input lever 1 engages with the stop lever 7, and one step of the stop lever 7 contacts the end step of the input lever 1. When the input lever 1 rotates, it drives the stop lever 7 to rotate, transmitting torque. The stop block 5 engages with the other step of the stop lever 7. The stop block 5 is used to lock the stop lever 7 and prevent it from rotating. The stop block 5 is an L-shaped plate with an arc. One end of the stop block 5 has an arc-shaped lower surface (i.e., the contact surface) that contacts one end of the stop lever 7's plane line, and the other end of the stop block 5 contacts the release lever 6. After the force is stopped, under the action of the spring force of the first return spring 11, the stop lever 7 rotates clockwise around the axis, pushing the stop block 5 to rotate counterclockwise. When the stop surface 16 of the stop lever 7 passes the arc surface 17 of the stop block 5, the contact surface between the stop lever 7 and the stop block 5 disengages, and then the stop block 5 can rotate clockwise to reset under the action of the spring force of the second return spring 18.

[0042] like Figure 3 and Figure 4 As shown, an electric unloading mechanism 10 is installed inside the handle 3. The electric unloading mechanism 10 is connected to one end of the trip lever 6, and the other end of the trip lever 6 is in contact with the stop block 5. The electric unloading mechanism 10 is used to control the rotation of the trip lever 6. The electric unloading mechanism 10 is an electromagnet or a motor. By controlling the rotation of the trip lever 6 through the electric unloading mechanism 10, the trip lever 6 drives the stop block 5 to rotate, so that the stop teeth can selectively engage and disengage with the stop lever 7.

[0043] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An electronic torque limiting wrench with a lever structure, comprising an input lever, a force application handle, a handle portion, a lever reducing mechanism, a stop block, and a release lever, characterized in that: It also includes a stop lever, the input lever is connected to the force-applying handle, the lever reducing mechanism is disposed between the stop lever and the input lever and is used to transmit torque between the stop lever and the input lever, the input lever is rotatably connected to the handle through a first rotating shaft, the stop lever is rotatably connected to the handle through a second rotating shaft, the stop block is rotatably connected to the handle through a third rotating shaft, the trip lever is rotatably connected to the handle through a fourth rotating shaft, and the stop block is disposed between the trip lever and the stop lever.

2. The electronic torque limiting wrench with lever structure according to claim 1, characterized in that: The lever reducing mechanism includes a reducing lever, and at least one reducing lever is provided. The reducing lever is located between the stop lever and the input lever, and the reducing lever is rotatably connected to the handle through a fifth rotating shaft.

3. The electronic torque limiting wrench with a lever structure according to claim 1 or 2, characterized in that: An electric unloading mechanism is provided inside the handle. The electric unloading mechanism is connected to one end of the release lever, and the other end of the release lever is in contact with the stop block.

4. The electronic torque limiting wrench with lever structure according to claim 3, characterized in that: The electric unloading mechanism is an electromagnet or a motor.

5. The electronic torque limiting wrench with a lever structure according to claim 1 or 2, characterized in that: The axes of the first rotating shaft, the second rotating shaft, the third rotating shaft, and the fourth rotating shaft are parallel.

6. An electronic torque limiting wrench with a lever structure, comprising an input lever, a force application handle, a handle portion, a stop block, and a release lever, characterized in that: It also includes a stop lever, the input lever is connected to the force application handle, the stop lever and the input lever transmit torque to each other, the input lever is rotatably connected to the handle through a first rotating shaft, the stop lever is rotatably connected to the handle through a second rotating shaft, the stop block is rotatably connected to the handle through a third rotating shaft, the trip lever is rotatably connected to the handle through a fourth rotating shaft, and the stop block is disposed between the trip lever and the stop lever.

7. The electronic torque limiting wrench with lever structure according to claim 6, characterized in that: An electric unloading mechanism is provided inside the handle. The electric unloading mechanism is connected to one end of the release lever, and the other end of the release lever is in contact with the stop block.

8. The electronic torque limiting wrench with lever structure according to claim 6, characterized in that: The electric unloading mechanism is an electromagnet or a motor.

9. The electronic torque limiting wrench with a lever structure according to any one of claims 6 to 8, characterized in that: The axes of the first rotating shaft, the second rotating shaft, the third rotating shaft, and the fourth rotating shaft are parallel.

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