Auxiliary tool for assembling and disassembling coupler
By using a combination of positioning pin keys and tooth ratchets in the auxiliary tooling of the coupling, the problem of poor fixing effect of bolt end surfaces during the coupling loading and unloading process is solved, achieving more efficient disassembly and more stable fixing effect.
Patent Information
- Application Number
- CN202421263286.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-04
AI Technical Summary
In the prior art, when loading and unloading the coupling, due to the poor fixing effect of the bolt end surface, bolts are prone to idling, resulting in inconvenient disassembly.
An auxiliary tool is provided, including a positioning part, an operating handle and a toothed ratchet. The positioning pin key is provided on the outer surface of the positioning part. The positioning pin key is inserted into the circular hole of the end face of the coupling bolt by the rotation of the toothed ratchet, and the end face of the bolt is fixed to prevent the bolt from idling.
By fixing the end surface of the coupling bolt, the bolts are prevented from idling, the disassembly efficiency is improved, and the position of the positioning pin key is adjusted according to the distribution position of the circular holes on the end surface of the bolt, thereby improving the fixing effect.
Smart Images
Figure CN222589571U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of assembly in mechanical manufacturing, and in particular to an auxiliary tooling for loading and unloading a coupling. Background Art
[0002] A coupling is a mechanical element used to connect two shafts to transmit rotational force or motion. As a device connecting two shafts, the coupling can transmit power and motion, thereby achieving the coordinated work of mechanical equipment. During the production process, the coupling needs to be disassembled in scenarios such as maintenance and replacement, equipment upgrades, cleaning and maintenance, and adjustment of installation positions.
[0003] The prior art is to load and unload the coupling by means of a circlip clamp. However, since the operating space at the connection between the existing coupling and the generator is relatively narrow, and the bolt end face in the coupling is circular, the angle of the connection between the multiple independent circular holes on the circular end face is not fixed. When the circlip clamp is used for loading and unloading, it is very easy to be limited by the operating space. As a result, the circlip clamp has a poor effect of limiting the position of the bolt end face, and the bolt is prone to idle rotation, which brings inconvenience to the disassembly work. Utility Model Content
[0004] The embodiment of the present application provides an auxiliary tooling for loading and unloading a coupling, which is used to solve the technical problem of poor fixing effect of the end face of the coupling bolt during loading and unloading of the coupling.
[0005] The embodiments of the present application provide the following technical solutions to solve the above technical problems:
[0006] An embodiment of the present application provides an auxiliary tooling for loading and unloading a coupling, including a tooling body, wherein the tooling body includes: a positioning portion, an operating handle, the positioning portion is connected to the operating handle, wherein a toothed ratchet and two locating pin keys arranged on the toothed ratchet are arranged inside the positioning portion, and each of the locating pin keys passes through the outer surface of the positioning portion; the two locating pin keys are arranged opposite to each other on the toothed ratchet, and the connecting line of the two locating pin keys coincides with a base circle diameter of the toothed ratchet, and the toothed ratchet is rotated to drive the two locating pin keys to rotate, so that the locating pin keys can be inserted into the circular hole on the bolt end face of the coupling.
[0007] Beneficial effects of the embodiments of the present application: The auxiliary tooling for loading and unloading the coupling provided by the embodiments of the present application inserts the locating pin key on the outer surface of the locating part into the end face of the coupling bolt, so that during the coupling disassembly process, the coupling bolt end face can be fixed, thereby preventing the bolt from idling and improving the disassembly efficiency. In addition, the two locating pin keys are relatively arranged on the toothed ratchet inside the locating part, so that the locating pin keys can rotate with the rotation of the toothed ratchet. When fixing the coupling bolt end face, it can be adaptively adjusted according to the distribution position of the circular holes on the bolt end face. The position of the locating pin key can be changed by rotating the toothed ratchet, so that the locating pin key is easy to insert into the circular hole on the bolt end face, thereby facilitating the fixing of the bolt end faces at different positions and improving the fixing effect.
[0008] In a possible embodiment, two pawls are further provided inside the positioning portion, and the pawls are rotatably connected to the inner surface of the positioning portion, and the toothed ratchet is rotatably connected to the inner surface of the positioning portion; wherein one end of the pawl is movably connected to the toothed ratchet, and the pawl is rotated to make it contact with the toothed ratchet to limit the rotation direction of the toothed ratchet.
[0009] In a possible implementation manner, a disc cam is further provided inside the positioning portion, and the disc cam is movably connected to the pawl; wherein the disc cam is rotated to drive the pawl to contact or leave the toothed ratchet wheel.
[0010] In a possible implementation, the two pawls are arranged opposite to each other, and the disc cam is located between the two pawls; wherein the distance between the two pawls is greater than twice the shortest diameter of the disc cam, and the distance between the two pawls is less than twice the cam radius of the disc cam.
[0011] In a possible embodiment, a first rotating handle is provided at the rotation center of the disc cam, and a second rotating handle is provided at the rotation center of the toothed ratchet. The first rotating handle and the second rotating handle are provided on the outer surface of the positioning portion, and the first rotating handle and the second rotating handle are rotated to drive the disc cam and the toothed ratchet to rotate.
[0012] In a possible implementation manner, a spring is further disposed inside the positioning portion, one end of the spring is connected to the inner surface of the positioning portion, and the other end of the spring is connected to the pawl.
[0013] In a possible implementation manner, a rotation center of the disc cam and a rotation center of the toothed ratchet are located on the same horizontal line.
[0014] In a possible implementation manner, the distance between the two positioning pin keys is the same as the distance between the diagonal circular holes on the bolt end face of the coupling.
[0015] In a possible implementation manner, the diameter of the locating pin key does not exceed the diameter of the circular hole on the end surface of the bolt.
[0016] In a possible implementation manner, the lengths of the first rotating handle and the second rotating handle are smaller than the length of the positioning pin key.
[0017] In addition to the technical problems solved by the present application, the technical features that constitute the technical solution, and the beneficial effects brought about by the technical features of the technical solution described above, other technical problems that can be solved by the auxiliary tooling for loading and unloading couplings provided by the present application, other technical features included in the technical solution, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0019] Figure 1 A schematic diagram of the structure of an auxiliary tooling for loading and unloading a coupling provided in an embodiment of the present application;
[0020] Figure 2 A top view of an auxiliary tooling for loading and unloading a coupling provided in an embodiment of the present application;
[0021] Figure 3 A side view of the auxiliary tooling for loading and unloading the coupling provided in an embodiment of the present application.
[0022] Description of reference numerals:
[0023] 100. Tool body; 101. Positioning portion; 102. Operating handle; 103. Toothed ratchet; 104. Positioning pin key; 105. Ratchet pawl; 106. Disc cam; 107. Second rotating handle; 108. First rotating handle.
[0024] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0025] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.
[0026] In the related art, when the coupling is repaired, replaced, upgraded, cleaned, maintained, or the installation position is adjusted, the coupling needs to be loaded and unloaded using a retaining spring clamp. However, since the operating space at the connection between the existing coupling and the generator is relatively narrow, and the bolt end face in the coupling is circular, the angle of the connection between the multiple independent circular holes on the circular end face is not fixed. When the retaining spring clamp is used for loading and unloading, it is very easy to be limited by the operating space. As a result, the retaining spring clamp has a poor effect on the limiting and fixing effect on the bolt end face, and the bolt is prone to idle rotation, which brings inconvenience to the disassembly work.
[0027] In view of this, the embodiment of the present application sets a positioning pin key on the outer surface of the positioning part of the auxiliary tooling, so that during the coupling disassembly process, the positioning pin key can be inserted into the circular hole of the coupling bolt end face, thereby fixing the coupling bolt end face, preventing the bolt from idling, and improving the disassembly efficiency. In addition, the two positioning pin keys are relatively set on the toothed ratchet inside the positioning part, so that the positioning pin keys can rotate with the rotation of the toothed ratchet, and when fixing the coupling bolt end face, it can be adaptively adjusted according to the distribution position of the circular hole on the bolt end face. In addition, a ratchet pawl movably connected to the toothed ratchet and a cam movably connected to the ratchet pawl are set inside the positioning part, and the pawl can be brought into contact with the toothed ratchet by rotating the cam, thereby limiting the rotation direction of the toothed ratchet, and the pawl can be separated from the toothed ratchet by rotating the cam, so that the toothed ratchet can rotate freely, which is convenient for fixing the bolt end faces at different positions and improving the fixing effect.
[0028] A coupling is a mechanical device used to connect two shafts or shafts and mechanical elements (such as fans, pumps, etc.) to transmit torque and rotational motion. The coupling can accurately connect the rotational motion of two shafts and enable them to run synchronously. At the same time, it has a certain elasticity and allowable angle, and can absorb the misalignment between the shafts or the offset between the axes to a certain extent, making the transmission more stable and reliable. The application scenarios of couplings include but are not limited to the following aspects: 1. Mechanical transmission system. Couplings are widely used in various mechanical transmission systems, such as industrial machinery, machine tools, wind power generation equipment, pumps, fans, etc., to connect the shafts of different components and transmit rotational force and torque. 2. Automobile industry. In the automotive field, couplings are usually used to connect the engine with the transmission system to transmit the power generated by the engine to the wheels. 3. Ship engineering. Couplings are also used in the propulsion system of ships to connect the main engine and the propeller shaft to achieve power transmission. 4. Wind power generation. In the wind power generation industry, couplings are often used to connect the wind turbine's wind wheel and the rotor shaft of the generator to transmit the rotational power of the wind wheel to the generator.
[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0030] Figure 1 This is a schematic diagram of the structure of the auxiliary tooling for loading and unloading the coupling provided in the embodiment of the present application. Figure 1As shown, the auxiliary tooling for loading and unloading the coupling includes a tooling body 100, and the tooling body 100 includes a positioning portion 101 and an operating handle 102, wherein the positioning portion 101 is internally provided with a toothed ratchet 103 and two positioning pin keys 104 arranged on the toothed ratchet 103, and each positioning pin key 104 passes through the outer surface of the positioning portion 101; the two positioning pin keys 104 are arranged opposite to each other on the toothed ratchet 103, and the connecting line of the two positioning pin keys 104 coincides with a base circle diameter of the toothed ratchet 103, and the toothed ratchet 103 is rotated to drive the two positioning pin keys 104 to rotate, so that the positioning pin keys 104 can be inserted into the circular hole on the bolt end face of the coupling. That is to say, the two positioning pin keys 104 can rotate with the rotation of the toothed ratchet 103, and because the two positioning pin keys 104 pass through the outer surface of the positioning portion 101, the two positioning pin keys 104 can be inserted into the circular holes on the bolt end faces of the coupling, and the two positioning pin keys 104 can adjust their relative positions with the circular holes on the bolt end faces by following the rotation of the toothed ratchet 103. Through the above arrangement, during the coupling disassembly process, the positioning pin keys 104 can adjust their relative positions with the circular holes on the bolt end faces, ensuring that the positioning pin keys 104 can be inserted into the circular holes on the bolt end faces of the coupling, thereby fixing the bolt end faces of the coupling, preventing the bolts from idling, and improving the disassembly efficiency.
[0031] Preferably, the connection line of the two locating pin keys 104 passes through the center of the toothed ratchet 103, and the distance between the two locating pin keys 104 is equal to the distance between the two farthest circular holes in the end face of the coupling bolt. When the locating pin key 104 of the positioning portion 101 is inserted into the circular hole on the end face of the coupling bolt, the length of the locating pin key 104 can be no less than the sum of the height of the positioning portion 101 and the depth of the circular hole on the end face of the bolt. For example, the length of the locating pin key 104 is greater than the sum of the height of the positioning portion 101 and the depth of the circular hole on the end face of the bolt. Through the above arrangement, it can be ensured that when the locating pin key 104 is inserted into the circular hole on the end face of the bolt, the locating pin key 104 can completely reach the bottom of the circular hole on the end face of the bolt, thereby achieving effective positioning and ensuring the firmness and stability of the connection.
[0032] Specifically, when the auxiliary tooling for loading and unloading the coupling provided in the embodiment of the present application is used for positioning, the positioning portion 101 is close to the bolt end face, and the operating handle 102 is away from the bolt end face. The positioning pin key 104 on the positioning portion 101 is inserted into the circular hole on the bolt end face by controlling the operating handle 102.
[0033] In some embodiments of the present application, two pawls 105 are further provided inside the positioning portion 101, and the pawls 105 are rotatably connected to the inner surface of the positioning portion 101, and the toothed ratchet 103 is rotatably connected to the inner surface of the positioning portion 101; wherein one end of the pawl 105 is movably connected to the toothed ratchet 103, and the pawl 105 is rotated to make it contact with the toothed ratchet 103 to limit the rotation direction of the toothed ratchet 103. In other words, the toothed ratchet 103 and the two pawls 105 are rotatably provided on the inner surface of the positioning portion 101, and one end of each pawl 105 can be rotated to a position in contact with the toothed ratchet 103, and when the pawl 105 contacts the toothed ratchet 103, the pawl 105 can limit the rotation of the toothed ratchet 103 in a certain direction.
[0034] Specifically, combined Figure 1 As shown, in Figure 1 When the pawl 105 at the upper part of the positioning part 101 contacts the toothed ratchet 103 and the pawl 105 at the lower part of the positioning part 101 is separated from the toothed ratchet 103, the pawl 105 can limit the clockwise rotation of the toothed ratchet 103. When the pawl 105 at the upper part of the positioning part 101 is separated from the toothed ratchet 103 and the pawl 105 at the lower part of the positioning part 101 is in contact with the toothed ratchet 103, the pawl 105 can limit the counterclockwise rotation of the toothed ratchet 103. When the two pawls 105 in the positioning part 101 contact the toothed ratchet 103 at the same time, the toothed ratchet 103 remains in a stable state and does not rotate. The above arrangement can limit the rotation direction of the toothed ratchet 103, thereby ensuring that the toothed ratchet 103 rotates only in the required direction, avoiding unnecessary rotation or reversal. After the position of the positioning pin key 104 is determined, the two pawls 105 are in contact with the toothed ratchet 103 so that the toothed ratchet 103 can be fixed to avoid rotation, thereby ensuring the positioning and fixing effect.
[0035] In some embodiments of the present application, a disc cam 106 is further provided inside the positioning portion 101, and the disc cam 106 is movably connected to the pawl 105; wherein the disc cam 106 is rotated to drive the pawl 105 to contact or leave the toothed ratchet 103. Preferably, the disc cam 106 is a disc-shaped part with a variable diameter that can rotate around a fixed axis. When the disc cam 106 with a larger diameter contacts the pawl 105, the disc cam 106 can make the pawl 105 away from the toothed ratchet 103, and then the rotation or locking of the toothed ratchet 103 can be controlled by the rotation of the disc cam 106. Further, when the disc cam 106 with a larger diameter contacts one of the pawls 105 to make it away from the toothed ratchet 103, the other pawl 105 contacts the disc cam 106 with a smaller diameter and the toothed ratchet 103, and then the toothed ratchet 103 can rotate unidirectionally clockwise or counterclockwise. When the larger diameter portion of the disc cam 106 does not contact the two pawls 105, one end of the two pawls 105 contacts the toothed ratchet 103, thereby keeping the toothed ratchet 103 fixed. The arrangement of the disc cam 106 enables the toothed ratchet 103 to rotate in one direction, rotate in two directions, and be fixed, thereby improving the flexibility of the toothed ratchet 103.
[0036] In some embodiments of the present application, two pawls 105 are arranged opposite to each other, and the disc cam 106 is located between the two pawls 105; wherein the distance between the two pawls 105 is greater than twice the shortest diameter of the disc cam 106, and the distance between the two pawls 105 is less than twice the cam radius of the disc cam 106. The shortest diameter of the disc cam 106 refers to the shortest distance between the cam profile of the disc cam 106 and the rotation center. The cam radius of the disc cam 106 refers to the farthest distance between the cam profile of the disc cam 106 and the rotation center. In other words, the distance between the two pawls 105 is greater than twice the shortest diameter of the disc cam 106, so that when the disc cam 106 rotates to a certain position, the disc cam 106 can be between the two pawls 105 but not in contact with the two pawls 105. For example, the certain position can be a position where the extension line of the cam radius of the disc cam 106 passes through the rotation center of the toothed ratchet 103. Furthermore, the distance between the two pawls 105 is less than twice the cam radius of the disc cam 106, so that the disc cam 106 can contact the two pawls 105 when rotating and bring the pawls 105 away from the toothed ratchet 103, ensuring that the toothed ratchet 103 can rotate.
[0037] In some embodiments of the present application, a first rotating handle 108 is provided at the rotation center of the disc cam 106, and a second rotating handle 107 is provided at the rotation center of the toothed ratchet 103. The first rotating handle 108 and the second rotating handle 107 are provided on the outer surface of the positioning portion 101. The first rotating handle 108 and the second rotating handle 107 are rotated to drive the disc cam 106 and the toothed ratchet 103 to rotate. Through the above arrangement, when adjusting the position of the positioning pin key 104, the staff can do so by rotating the first rotating handle 108 and the second rotating handle 107 on the outer surface of the positioning portion 101, thereby improving the convenience of operation.
[0038] Specifically, when adjusting the position of the positioning pin key 104, the first rotating handle 108 is rotated, and the rotation direction of the first rotating handle 108 is determined according to the rotation direction of the positioning pin key 104. After the rotation direction of the first rotating handle 108 is determined, the first rotating handle 108 is rotated to the desired position. The above-mentioned desired position can be the position of the first rotating handle 108 when one of the pawls 105 leaves the toothed ratchet 103. Then the second rotating handle 107 is rotated, and the toothed ratchet 103 is driven to rotate by rotating the second rotating handle 107, thereby driving the two positioning pin keys 104 to rotate. After the positions of the two positioning pin keys 104 are determined according to the circular holes on the end faces of the bolts, the first rotating handle 108 is rotated so that the two pawls 105 are in contact with the toothed ratchet 103, thereby achieving the fixation of the toothed ratchet 103.
[0039] In some embodiments of the present application, a spring is further provided inside the positioning portion 101, one end of the spring is connected to the inner surface of the positioning portion 101, and the other end of the spring is connected to the pawl 105. Through the above arrangement, after the disc cam 106 takes the pawl 105 away from the toothed ratchet 103, when the first rotating handle 108 is rotated to return the cam to the initial position, the pawl 105 that has left the toothed ratchet 103 can return to the toothed ratchet 103 under the action of the spring, thereby improving the convenience and stability of operation and preventing the pawl 105 from failing to automatically return to its original position after leaving the toothed ratchet 103, thereby preventing the toothed ratchet 103 from rotating unnecessarily.
[0040] In some embodiments of the present application, the rotation center of the disc cam 106 and the rotation center of the toothed ratchet 103 are located on the same horizontal line.
[0041] In some embodiments of the present application, the spacing between the two locating pin keys 104 is the same as the spacing between the diagonal circular holes on the bolt end face of the coupling. Through the above arrangement, the alignment and matching between the locating pin keys 104 and the diagonal circular holes on the bolt end face can be ensured, and when the auxiliary tooling for loading and unloading the coupling provided in the embodiment of the present application is inserted into the diagonal circular holes, accurate positioning can be achieved.
[0042] Combine the following Figure 2 and Figure 3 The auxiliary tooling for loading and unloading the coupling provided in the embodiment of the present application is further described. Figure 2 A top view of an auxiliary tooling for loading and unloading a coupling provided in an embodiment of the present application, Figure 3 A side view of an auxiliary tooling for loading and unloading a coupling provided in an embodiment of the present application. Figure 2 As shown, in some embodiments of the present application, the diameter of the positioning pin key 104 does not exceed the diameter of the circular hole on the end face of the bolt. Preferably, the positioning pin key 104 can be a pin key of φ5.38. Through the above arrangement, it can be ensured that the positioning pin key 104 and the circular hole on the end face of the bolt are more closely matched, thereby ensuring the stability of fixation and positioning.
[0043] In some embodiments of the present application, the length of the first rotating handle 108 and the second rotating handle 107 is less than the length of the positioning pin key 104. Through the above arrangement, it is possible to avoid the first rotating handle 108 and the second rotating handle 107 from colliding and squeezing with the bolt end face during the fixing and positioning process, and avoid mutual interference between the rotating handles and the bolt end face. Optionally, when the positioning pin key 104 of the positioning portion 101 is inserted into the circular hole of the coupling bolt end face, the length of the positioning pin key 104 can be no less than the height of the positioning portion 101 and the depth of the circular hole of the bolt end face. For example, the length of the positioning pin key 104 is equal to the sum of the thickness of the positioning portion 101, the depth of the circular hole of the bolt end face, and the height of the second rotating handle 107.
[0044] It should be noted that: in this application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0045] In addition, in this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An auxiliary tool for loading and unloading a coupling, characterized in that: The tool body (100) comprises: a positioning portion (101) and an operating handle (102); the positioning portion (101) is connected to the operating handle (102); a toothed ratchet (103) and two positioning pins (104) arranged on the toothed ratchet (103) are arranged inside the positioning portion (101); each of the positioning pins (104) passes through the outer surface of the positioning portion (101); the two positioning pins (104) are arranged opposite to each other on the toothed ratchet (103), and the connecting line of the two positioning pins (104) coincides with a base circle diameter of the toothed ratchet (103); the toothed ratchet (103) is rotated to drive the two positioning pins (104) to rotate, so that the positioning pins (104) can be inserted into the circular hole on the bolt end face of the coupling.
2. The auxiliary tooling according to claim 1, characterized in that: Two pawls (105) are also provided inside the positioning portion (101), and the pawls (105) are rotatably connected to the inner surface of the positioning portion (101), and the toothed ratchet (103) is rotatably connected to the inner surface of the positioning portion (101); wherein one end of the pawl (105) is movably connected to the toothed ratchet (103), and the pawl (105) is rotated to make it contact with the toothed ratchet (103) so as to limit the rotation direction of the toothed ratchet (103).
3. The auxiliary tooling according to claim 2, characterized in that: A disc-shaped cam (106) is also provided inside the positioning portion (101), and the disc-shaped cam (106) is movably connected to the pawl (105); wherein the disc-shaped cam (106) is rotated to drive the pawl (105) to contact or leave the toothed ratchet wheel (103).
4. The auxiliary tooling according to claim 3, characterized in that: The two pawls (105) are arranged opposite to each other, and the disc-shaped cam (106) is located between the two pawls (105); wherein the distance between the two pawls (105) is greater than twice the shortest diameter of the disc-shaped cam (106), and the distance between the two pawls (105) is less than twice the cam radius of the disc-shaped cam (106).
5. The auxiliary tooling according to claim 4, characterized in that: A first rotating handle (108) is disposed at the rotation center of the disc cam (106), and a second rotating handle (107) is disposed at the rotation center of the toothed ratchet (103). The first rotating handle (108) and the second rotating handle (107) are disposed on the outer surface of the positioning portion (101), and the first rotating handle (108) and the second rotating handle (107) are rotated to drive the disc cam (106) and the toothed ratchet (103) to rotate.
6. The auxiliary tooling according to claim 5, characterized in that: A spring is also provided inside the positioning portion (101), one end of the spring is connected to the inner surface of the positioning portion (101), and the other end of the spring is connected to the pawl (105).
7. The auxiliary tooling according to claim 6, characterized in that: The rotation center of the disc cam (106) and the rotation center of the toothed ratchet (103) are located on the same horizontal line.
8. The auxiliary tooling according to claim 1, characterized in that: The spacing between the two positioning pin keys (104) is the same as the spacing between the diagonal circular holes on the bolt end surface of the coupling.
9. The auxiliary tooling according to claim 8, characterized in that: The diameter of the positioning pin key (104) does not exceed the diameter of the circular hole on the end surface of the bolt.
10. The auxiliary tooling according to claim 5, characterized in that: The lengths of the first rotating handle (108) and the second rotating handle (107) are smaller than the length of the positioning pin key (104).