Double-angle detection vice for cotter pin
By designing adjustable limit plugs and a rotating shaft structure for dual-angle detection of cotter pins, this invention solves the problem that existing pliers cannot simultaneously detect 60° and 90° cotter pins, achieving flexible angle detection and improving tool stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-26
- Publication Date
- 2026-04-14
AI Technical Summary
The opening angle of existing pliers is fixed, which cannot meet the angle requirements for testing 60° and 90° cotter pins at the same time. The testing personnel need to carry two pliers with different angles, which makes it inconvenient to use.
A dual-angle detection pliers for cotter pins is designed. Through a detachable limiting plug and a rotating shaft structure, the maximum opening angle can be adjusted to achieve detection functions of 60° and 90°.
It enables flexible switching of the same tool for detection at different angles, improving the convenience and accuracy of detection and reducing the probability of tool loss and damage.
Smart Images
Figure CN224115979U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of testing tools, and in particular to a double-angle testing pliers for cotter pins. Background Technology
[0002] Cotter pins are widely used in municipal rail transit construction. In stud-nut locking structures, a locking cap that mates with the nut is typically included. The cotter pin is inserted into the end of the stud to prevent the locking cap from separating from the nut and to prevent the locking cap from falling off the stud. The two prongs of the cotter pin are bent relative to each other to form an open structure. According to relevant requirements for rail transit construction, the opening angle of the two prongs of some cotter pins is required to be 60°, and the opening angle of the two prongs of some cotter pins is required to be 90°.
[0003] Currently, the angle of the two support rods of a cotter pin is usually tested using pliers. By using pliers with an opening angle of 60° or 90°, and aligning the rotation axis of the pliers with the bending points of the two support rods of the cotter pin, the angle formed by the clamping part of the pliers can be used to determine whether the opening angle of the two support rods of the cotter pin meets the requirements.
[0004] Regarding the aforementioned technologies, since the current commonly used testing angles are 60° and 90°, and the opening angle of each pair of pliers is fixed, testing personnel typically need to carry one pair of pliers with an opening angle of 60° and another with an opening angle of 90°. Therefore, the inventors believe there is a need to develop a dual-angle testing pliers capable of detecting cotter pins at both angles. Utility Model Content
[0005] This application provides a cotter pin dual-angle detection pliers, which can be used to detect cotter pins with two different opening angles.
[0006] This application provides a cotter pin dual-angle inspection pliers, which adopts the following technical solution:
[0007] A cotter pin dual-angle detection pliers includes a first pliers body, a second pliers body rotatably connected relative to the first pliers body, and a rotating shaft structure connecting the first pliers body and the second pliers body; the first pliers body includes a first jaw and a first handle connected to the first jaw; the second pliers body includes a second jaw and a second handle connected to the second jaw; the first jaw has a first abutment surface on the side facing the second handle, the second handle has a first limiting surface for the first abutment surface to abut against, the second handle is detachably fitted with a first limiting plug, the first limiting plug includes a first main board, a first insert rod connected to the first main board, a first protrusion connected to the first main board and arranged between the first abutment surface and the first limiting surface, and the second handle has a first insertion hole for the first insert rod to be arranged.
[0008] By adopting the above technical solution, the maximum opening angle of the cotter pin dual-angle detection pliers can be adjusted by whether or not the first limit plug is installed, thereby obtaining a dual-angle detection function. When a large angle needs to be detected, the first limit plug is not installed, and the first abutment surface on the first pliers body can abut against the first limit surface of the second pliers body, thereby obtaining a larger maximum opening angle, that is, a larger detection angle. When a small angle needs to be detected, the first limit plug is installed, so that the first protrusion is arranged between the first abutment surface and the first limit surface. At this time, the first abutment surface of the first pliers body can abut against the first protrusion of the first limit plug, thereby obtaining a smaller maximum opening angle, that is, a smaller detection angle.
[0009] Optionally, the first protrusion has a second limiting surface for the first abutment surface to abut against and a first positioning surface that fits against the outer wall of the second handle.
[0010] By adopting the above technical solution, by setting a first positioning surface on the first protrusion, the first positioning surface can fit against the outer wall of the second handle after the first limiting plug is installed, which helps to increase the structural strength of the first protrusion and reduce the probability of deformation and damage to the first protrusion after the first pliers head abuts against the first protrusion.
[0011] Optionally, the first protrusion includes a first side plate, a second side plate connected to one end of the first side plate, and a third side plate connected to the other end of the first side plate and arranged opposite to the second side plate; the second limiting surface is arranged on the first side plate; and the first positioning surface is arranged on the second side plate.
[0012] By adopting the above technical solution, the first protrusion is further defined. The first protrusion includes a first side plate, a second side plate, and a third side plate, which makes the structural strength of the first protrusion more ideal and reduces the probability of deformation and damage to the first protrusion after the first clamp head abuts against it.
[0013] Optionally, the cross-section of the first insertion rod is square, and the cross-section of the first insertion hole matches the cross-section of the first insertion rod.
[0014] By adopting the above technical solution, the first insertion rod adopts a square-section insertion rod form, which makes it difficult for the first limit plug to rotate after installation, thereby improving the stability of the first limit plug after installation and helping to ensure the accuracy of cotter pin opening angle detection using cotter pin double angle detection pliers.
[0015] Optionally, the first socket is a blind socket structure, a first magnetic sheet is fixedly installed on the bottom surface of the first socket, and the first plug rod is made of magnetic material.
[0016] By adopting the above technical solution, the bottom of the first insertion rod can be attracted by the first magnetic sheet, which helps to reduce the probability of the first limiting plug falling out of the first socket.
[0017] Optionally, the second handle is provided with a first placement slot for placing the first motherboard. The bottom surface of the first placement slot is provided with a magnetic groove and a first magnetic block is arranged in the magnetic groove. The first motherboard is made of magnetic material.
[0018] By adopting the above technical solution, when the above cotter pin dual-angle detection pliers detect cotter pins with smaller angles, the first limiting plug can be placed in the first placement slot, and the first magnetic block can attract the first main board of the first limiting plug, which helps to reduce the probability of the first limiting plug being lost when it is not in use.
[0019] Optionally, the second clamp head has a second abutment surface on the side facing the first handle, and the first handle has a third limiting surface for the second abutment surface to abut against; when the first abutment surface abuts against the first limiting surface, the second abutment surface abuts against the third limiting surface.
[0020] By adopting the above technical solution, a second abutment is provided on the second clamp head, and a third limiting surface is provided on the first handle, which helps to improve the stability of the cotter pin dual-angle detection pliers when opened to the maximum angle.
[0021] Optionally, the first handle can be detachably fitted with a second limiting plug, the second limiting plug including a second main board, a second plug rod connected to the second main board, and a second protrusion connected to the second main board and arranged between the second back surface and the third limiting surface. The first handle has a second insertion hole for arranging the second plug rod; when the first back surface abuts against the first protrusion, the second back surface abuts against the second protrusion.
[0022] By adopting the above technical solution, the setting of the second limiting plug ensures that when detecting a larger angle, the first abutment surface of the first jaw head abuts against the first protrusion, and the second abutment surface of the second jaw head abuts against the second protrusion, which helps to improve the stability of the cotter pin double angle detection pliers when detecting a smaller angle.
[0023] Optionally, the first handle has a first rotating hole for arranging the rotating shaft structure; the second handle has a second rotating hole for arranging the rotating shaft structure; the rotating shaft structure includes a rotating sleeve and a locking bolt threaded to the rotating sleeve; the rotating sleeve has a rotating plate at its end that fits against the outer surface of the second handle; the bolt head of the locking bolt fits against the outer surface of the first handle.
[0024] By adopting the above technical solution, the specific structure of the rotating shaft structure is disclosed, and the rotating shaft structure makes the relative rotation of the first clamp and the second clamp relatively smooth.
[0025] Optionally, the end face of the rotating outer sleeve is coaxially provided with a threaded hole, and an abutment post is threadedly installed at the threaded hole.
[0026] By adopting the above technical solution, the abutment post provided on the end face of the rotating sleeve can abut against the opening of the cotter pin, which facilitates the support of the cotter pin double-angle detection pliers and also facilitates the comparison of the included angle between the first and second pliers with the included angle between the two support rods of the cotter pin.
[0027] In summary, this application includes at least one of the following beneficial technical effects:
[0028] 1. A cotter pin dual-angle detection pliers, comprising a first clamp body, a second clamp body, a rotating shaft structure, and a first limiting plug, which can be used to detect cotter pins with two opening angles by whether or not the first limiting plug is installed;
[0029] 2. By providing a first placement slot for placing the first limiting plug on the second handle, the first limiting plug can be placed in the first placement slot when detecting the opening angle of a cotter pin with a large angle, thereby reducing the probability of the first limiting plug being lost.
[0030] 3. By setting the abutment post, the abutment post can abut against the opening of the cotter pin, which facilitates the support of the cotter pin double-angle detection pliers, and also facilitates the comparison of the included angle between the first and second pliers with the included angle between the two support rods of the cotter pin. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the cotter pin double-angle detection pliers in Embodiment 1 when the first limiting plug is installed in the first placement slot.
[0032] Figure 2 This is an exploded schematic diagram of the cotter pin double-angle detection pliers in Example 1.
[0033] Figure 3 This is a schematic diagram of the cotter pin double-angle detection pliers in Embodiment 1 when the first limiting plug is installed in the first socket.
[0034] Figure 4 This is a schematic diagram of the back structure of the first limiting plug in Embodiment 1.
[0035] Figure 5 This is a schematic cross-sectional view of the first insertion hole and the first insertion rod in Embodiment 1.
[0036] Figure 6 This is a schematic diagram of the cotter pin double-angle detection pliers in Embodiment 2 when the first limiting plug is installed in the first placement slot and the second limiting plug is installed in the second placement slot.
[0037] Figure 7 This is a schematic diagram of the back structure of the second limiting plug in Embodiment 2.
[0038] Figure 8 This is a schematic cross-sectional view of the second insertion hole and the second insertion rod in Embodiment 2.
[0039] Figure 9 This is a schematic diagram of the cotter pin double-angle detection pliers in Embodiment 2 when the first limiting plug is installed in the first socket and the second limiting plug is installed in the second socket.
[0040] Explanation of reference numerals in the attached drawings: 1. First clamp body; 11. First clamp head; 111. First resting surface; 12. First handle; 121. First rotating part; 122. First rotating hole; 123. Third limiting surface; 124. Second insertion hole; 125. Second magnetic piece; 126. Second placement slot; 127. Second magnetic block; 2. Second clamp body; 21. Second clamp head; 211. Second resting surface; 22. Second handle; 221. Second rotating part; 222. Second rotating hole; 223. First limiting surface; 224. First insertion hole; 225. First magnetic piece; 226. First placement slot; 22 7. First magnetic block; 31. Rotating outer sleeve; 311. Rotating piece; 32. Locking bolt; 33. Abutment post; 4. First limiting plug; 41. First main board; 42. First insert rod; 43. First protrusion; 431. First side plate; 432. Second side plate; 433. Third side plate; 434. Second limiting surface; 435. First positioning surface; 5. Second limiting plug; 51. Second main board; 52. Second insert rod; 53. Second protrusion; 531. Fourth side plate; 532. Fifth side plate; 533. Sixth side plate; 534. Fourth limiting surface; 535. Second positioning surface. Detailed Implementation
[0041] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.
[0042] Example 1:
[0043] This application discloses a double-angle detection pliers for cotter pins. (Refer to...) Figure 1 and Figure 2 The cotter pin double-angle testing pliers include a first jaw body 1, a second jaw body 2 rotatably connected relative to the first jaw body 1, and a rotating shaft structure connecting the first jaw body 1 and the second jaw body 2. The first jaw body 1 includes a first jaw head 11 and a first handle 12 connected to the first jaw head 11. The second jaw body 2 includes a second jaw head 21 and a second handle 22 connected to the second jaw head 21.
[0044] Reference Figure 2 The first handle 12 has a first rotating part 121 at one end near the first clamp body 1. The left and right sides of the first rotating part 121 are coaxial arc surfaces. The first rotating part 121 has a first rotating hole 122 for arranging a rotating shaft structure. The axis of the first rotating hole 122 coincides with the axis of the arc surfaces on the left and right sides of the first rotating part 121. The second handle 22 has a second rotating part 221 at one end near the second clamp body 2, and the second rotating part 221 is arranged in close contact with the first rotating part 121. The left and right sides of the second rotating part 221 are also corresponding coaxial arc surfaces, and the left and right sides of the first rotating part 121 and the left and right sides of the second rotating part 221 are located on the same cylindrical surface. The second rotating part 221 has a second rotating hole 222 corresponding to the first rotating hole 122 for arranging a rotating shaft structure. The axis of the second rotating hole 222 coincides with the axis of the arc surfaces on the left and right sides of the second rotating part 221.
[0045] Reference Figure 2 The rotating shaft structure includes a rotating sleeve 31 and a locking bolt 32 that is threaded into the rotating sleeve 31. The rotating sleeve 31 is rotatably inserted into the first rotating hole 122 and the second rotating hole 222. The end of the rotating sleeve 31 is provided with a rotating plate 311 that fits against the outer surface of the second rotating part 221. The bolt head of the locking bolt 32 fits against the outer surface of the first handle 12, so that the rotating shaft structure rotatably connects the first clamp body 1 and the second clamp body 2 and is not easily dislodged from the first clamp body 1 and the second clamp body 2.
[0046] Reference Figure 2 To facilitate the detection of the cotter pin angle by the double-angle detection pliers, the rotating sleeve 31 has a threaded hole coaxially opened on the end face where the rotating plate 311 is provided, and an abutment post 33 is threadedly installed at the threaded hole. The abutment post 33 is a cylindrical structure with a length of 5mm.
[0047] Reference Figure 1 The first jaw 11 has a first abutment surface 111 on the side facing the second handle 22. The second handle 22 has a first limiting surface 223 for the first abutment surface 111 to abut against. The second jaw 21 has a second abutment surface 211 on the side facing the first handle 12, and the first handle 12 has a third limiting surface 123 for the second abutment surface 211 to abut against. When the first abutment surface 111 abuts against the first limiting surface 223, the second abutment surface 211 abuts against the third limiting surface 123. In this embodiment, when the first abutment surface 111 abuts against the first limiting surface 223, the included angle between the inner clamping surface of the first jaw 11 and the inner clamping surface of the second jaw 21 is 90°.
[0048] Reference Figure 1 , Figure 3 and Figure 4 The second handle 22 is detachably fitted with a first limiting plug 4. The first limiting plug 4 is made of magnetic material. The first limiting plug 4 includes a first main board 41, a first insert 42 connected to the first main board 41, and a first protrusion 43 connected to the first main board 41 and arranged between the first abutment surface 111 and the first limiting surface 223. The first protrusion 43 is arranged on the back side of the first main board 41 near the first clamp head 11. The first protrusion 43 includes a first side plate 431, a second side plate 432 connected to one end of the first side plate 431, and a third side plate 433 connected to the other end of the first side plate 431 and arranged opposite to the second side plate 432. The first side plate 431 has a second limiting surface 434 for the first abutment surface 111 to abut against. The second side plate 432 has a first positioning surface 435 that conforms to the outer wall of the second rotating part 221.
[0049] Reference Figure 1 and Figure 5 The second handle 22 has a first insertion hole 224 for accommodating the first insertion rod 42. In this embodiment, the cross-section of the first insertion rod 42 is square, and the cross-section of the first insertion hole 224 matches the cross-section of the first insertion rod 42. The first insertion hole 224 is a blind hole structure, and a first magnetic piece 225 for attracting the bottom end of the first insertion rod 42 is fixedly installed on the bottom surface of the first insertion hole 224.
[0050] Combination Figure 1 , Figure 4 and Figure 5 When the first insertion rod 42 is inserted into the first insertion hole 224, the first positioning surface 435 in the first limiting plug 4 is in contact with the outer wall of the second rotating part 221, and when the first abutting surface 111 abuts against the second limiting surface 434, the included angle between the inner clamping surface of the first clamping head 11 and the inner clamping surface of the second clamping head 21 is 60°.
[0051] Reference Figure 1 and Figure 3 To facilitate the storage of the first limiting plug-in 4 when not in use, the second handle 22 is provided with a first placement slot 226 for placing the first motherboard 41. The shape of the first placement slot 226 matches the shape of the first motherboard 41, and the thickness of the first motherboard 41 is the same as the depth of the first placement slot 226. The bottom surface of the first placement slot 226 has a first magnetic groove, and a first magnetic block 227 is arranged in the first magnetic groove. In this embodiment, the bottom surface of the first placement slot 226 has two first magnetic grooves, and a first magnetic block 227 is arranged in both first magnetic grooves.
[0052] Combination Figures 1 to 5 The implementation principle of the cotter pin dual-angle detection pliers in this application embodiment is as follows:
[0053] When it is necessary to test the opening angle of a cotter pin with a large angle (90°), firstly, open the first jaw 1 and the second jaw 2 of the cotter pin double angle testing pliers to the maximum angle, so that the first abutment surface 111 abuts against the first limiting surface 223 and the second abutment surface 211 abuts against the second limiting surface 434; then, place the abutment post 33 at the opening of the two support rods of the cotter pin, and then compare the included angle between the inner clamping surface of the first jaw head 11 and the inner clamping surface of the second jaw head 21 with the included angle between the two support rods of the cotter pin;
[0054] When it is necessary to test the opening angle of a cotter pin with a small angle (60°), firstly, when the first insertion rod 42 of the first limiting plug 4 is inserted into the first insertion hole 224, the first positioning surface 435 of the first limiting plug 4 is attached to the outer wall of the second rotating part 221, and the second limiting surface 434 of the second limiting plug 5 is located between the first limiting surface 223 and the first abutment surface 111; then, the first jaw 1 and the second jaw 2 of the cotter pin double angle detection pliers are opened to the maximum angle, so that the first abutment surface 111 abuts against the second limiting surface 434; then, the abutment post 33 is placed at the opening of the two support rods of the cotter pin, and then the included angle between the inner clamping surface of the first jaw head 11 and the inner clamping surface of the second jaw head 21 is compared with the included angle between the two support rods of the cotter pin.
[0055] Example 2:
[0056] Compared with Embodiment 1, the cotter pin double-angle detection pliers in this application embodiment are identical in structure except for the addition of a second limiting plug 5.
[0057] Reference Figure 6 and Figure 7In this embodiment, the first handle 12 is detachably fitted with a second limiting plug 5. The second limiting plug 5 is made of magnetic material. The second limiting plug 5 includes a second main board 51, a second insert 52 connected to the second main board 51, and a second protrusion 53 connected to the second main board 51 and arranged between the second abutment surface 211 and the third limiting surface 123. The second protrusion 53 is arranged on the back side of the second main board 51 near the second clamp head 21. The second protrusion 53 includes a fourth side plate 531, a fifth side plate 532 connected to one end of the fourth side plate 531, and a sixth side plate 533 connected to the other end of the fourth side plate 531 and arranged opposite to the fifth side plate 532. The fourth side plate 531 has a fourth limiting surface 534 for the second abutment surface 211 to abut against. The fifth side plate 532 has a second positioning surface 535 that fits against the outer wall of the first rotating part 121.
[0058] Reference Figure 6 , Figure 7 and Figure 8 The first handle 12 has a second insertion hole 124 for accommodating the second insertion rod 52. In this embodiment, the cross-section of the second insertion rod 52 is square, and the cross-section of the second insertion hole 124 matches the cross-section of the second insertion rod 52. The second insertion hole 124 is a blind hole structure, and a second magnetic piece 125 for attracting the bottom end of the second insertion rod 52 is fixedly installed on the bottom surface of the second insertion hole 124. When the second insertion rod 52 is inserted into the second insertion hole 124, the second positioning surface 535 in the second limiting plug 5 abuts against the outer wall of the first rotating part 121. When the second abutting surface 211 abuts against the fourth limiting surface 534, the included angle between the inner clamping surface of the first clamping head 11 and the inner clamping surface of the second clamping head 21 is 60°.
[0059] To facilitate the storage of the second limiting plug-in 5 when not in use, the first handle 12 is provided with a second placement slot 126 for placing the second motherboard 51. The shape of the second placement slot 126 matches the shape of the second motherboard 51, and the thickness of the second motherboard 51 is the same as the depth of the second placement slot 126. The bottom surface of the second placement slot 126 has a second magnetic groove, and a second magnetic block 127 is arranged in the second magnetic groove. In this embodiment, the bottom surface of the second placement slot 126 has two second magnetic grooves, and a second magnetic block 127 is arranged in both second magnetic grooves.
[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A double-angle detection pliers for cotter pins, comprising a first pliers body (1), a second pliers body (2) rotatably connected relative to the first pliers body (1), and a rotating shaft structure connecting the first pliers body (1) and the second pliers body (2); the first pliers body (1) includes a first pliers head (11) and a first handle (12) connected to the first pliers head (11); the second pliers body (2) includes a second pliers head (21) and a second handle (22) connected to the second pliers head (21); the first pliers head (11) has a first abutment surface (111) on the side facing the second handle (22), and the second handle (22) has a first limiting surface (223) for the first abutment surface (111) to abut against, characterized in that, The second handle (22) is detachably fitted with a first limiting plug (4). The first limiting plug (4) includes a first main board (41), a first plug rod (42) connected to the first main board (41), and a first protrusion (43) connected to the first main board (41) and arranged between the first back surface (111) and the first limiting surface (223). The second handle (22) has a first insertion hole (224) for the first plug rod (42) to be arranged.
2. The cotter pin dual-angle detection pliers according to claim 1, characterized in that, The first protrusion (43) has a second limiting surface (434) for the first abutment surface (111) to abut against and a first positioning surface (435) that fits against the outer wall of the second handle (22).
3. The cotter pin dual-angle detection pliers according to claim 2, characterized in that, The first protrusion (43) includes a first side plate (431), a second side plate (432) connected to one end of the first side plate (431), and a third side plate (433) connected to the other end of the first side plate (431) and arranged opposite to the second side plate (432); the second limiting surface (434) is arranged on the first side plate (431); and the first positioning surface (435) is arranged on the second side plate (432).
4. The cotter pin dual-angle detection pliers according to claim 1, characterized in that, The first insertion rod (42) has a square cross-section, and the cross-section of the first insertion hole (224) matches the cross-section of the first insertion rod (42).
5. A cotter pin dual-angle detection pliers according to claim 4, characterized in that, The first socket (224) is a blind hole structure. A first magnetic sheet (225) is fixedly installed on the bottom surface of the first socket (224). The first plug rod (42) is made of magnetic material.
6. The cotter pin dual-angle detection pliers according to claim 4, characterized in that, The second handle (22) is provided with a first placement slot (226) for placing the first motherboard (41). The bottom surface of the first placement slot (226) is provided with a magnetic groove and a first magnetic block (227) is arranged in the magnetic groove. The first motherboard (41) is made of magnetic material.
7. The cotter pin dual-angle detection pliers according to claim 1, characterized in that, The second clamp head (21) has a second abutment surface (211) on the side facing the first handle (12), and the first handle (12) has a third limiting surface (123) for the second abutment surface (211) to abut against; when the first abutment surface (111) abuts against the first limiting surface (223), the second abutment surface (211) abuts against the third limiting surface (123).
8. A cotter pin dual-angle detection pliers according to claim 7, characterized in that, The first handle (12) is detachably fitted with a second limiting plug (5). The second limiting plug (5) includes a second main board (51), a second plug rod (52) connected to the second main board (51), and a second protrusion (53) connected to the second main board (51) and arranged between the second back surface (211) and the third limiting surface (123). The first handle (12) has a second insertion hole (124) for the second plug rod (52) to be arranged. When the first back surface (111) abuts against the first protrusion (43), the second back surface (211) abuts against the second protrusion (53).
9. A cotter pin dual-angle detection pliers according to claim 1, characterized in that, The first handle (12) has a first rotating hole (122) for arranging the rotating shaft structure; the second handle (22) has a second rotating hole (222) for arranging the rotating shaft structure; the rotating shaft structure includes a rotating sleeve (31) and a locking bolt (32) threadedly engaged with the rotating sleeve (31); the rotating sleeve (31) has a rotating plate (311) at its end that fits against the outer surface of the second handle (22); the bolt head of the locking bolt (32) fits against the outer surface of the first handle (12).
10. A cotter pin dual-angle detection pliers according to claim 9, characterized in that, The end face of the rotating outer sleeve (31) is coaxially provided with a threaded hole and an abutment post (33) is threadedly installed at the threaded hole.