Belt pulley turning tool

Abstract

The utility model relates to the technical field of belt pulley machining, in particular to a belt pulley turning tool, which is sleeved in a back cavity of a belt pulley and comprises a positioning main body, a turning part, a turning part, a turning part and a turning part, the whole positioning main body is disc-shaped, and movable grooves are arranged on the periphery of the positioning main body at intervals around the axis; the first positioning block is arranged corresponding to the movable groove and slides in the movable groove; the adjusting module comprises a limiting bolt and an adjusting spring, and the limiting bolt enables the first positioning block to be connected into the movable groove in a screwed mode so that the first positioning block can slide in the movable groove along the limiting bolt. According to the belt pulley turning tool, the adjusting module is arranged between the movable groove of the positioning body and the first positioning block, and the first positioning block can slide in the movable groove in the length direction of the limiting bolt under the action of the adjusting spring, so that the first positioning block can expand the outer diameter of the positioning body; and the adaptive capacity of the belt pulley turning tool is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of belt pulley processing technology, and in particular to a belt pulley turning fixture. Background Technology

[0002] When machining the belt surface of existing pulleys, a positioning block and a bushing are usually used to support the inner hole of the pulley before machining the belt surface.

[0003] However, since the outer diameter of the locating block is a fixed size, it is affected by the diameter tolerance of the pulley cavity. Furthermore, the actual datum positioning of the turning fixture is at the outer diameter of the spring clamp. The diameter of the belt surface is relatively large, and there is no effective support for the cavity when turning at this location. As a result, there will be a gap between the pulley cavity and the locating block. Consequently, when turning at this location, there is no effective support between the pulley back cavity and the locating block. During turning, not only can the spindle speed not be too high, but the pulley belt surface is also prone to vibrating marks, resulting in a low yield rate and failing to meet quality requirements. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a pulley turning fixture to solve the problem that there is a gap between the existing positioning and fixing structure and the cavity on the back of the pulley, resulting in insufficient support and poor turning quality.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a pulley turning fixture, fitted into the back cavity of the pulley, comprising:

[0006] The positioning body is generally disc-shaped. Movable grooves are provided around the outer periphery of the positioning body at intervals around the axis. The width of the movable grooves gradually decreases from the edge of the positioning body to the axis. The movable grooves extend to both sides from the end of the movable grooves near the axis of the positioning body to the sides with limiting sections.

[0007] The first positioning block is set in the corresponding movable groove and slides in the movable groove. The first positioning block extends into the limiting section and has an movable gap with the limiting section.

[0008] The second positioning block is set on the top of the positioning body, and a telescopic spring is provided between the second positioning block and the positioning body;

[0009] The adjustment module includes a limit bolt and an adjustment spring. The limit bolt screws the first positioning block into the movable groove, so that the first positioning block slides along the limit bolt in the movable groove. The adjustment spring is set between the first positioning block and the movable groove. The sliding direction of the first positioning block is perpendicular to the sliding direction of the second positioning block.

[0010] In one embodiment, at least three active slots are provided.

[0011] In one embodiment, the adjustment module further includes an adjustment bolt, a limit screw hole is provided in the movable groove corresponding to the limit bolt, adjustment holes are provided on both sides of the limit screw hole, and the adjustment spring is provided in the adjustment hole; the first positioning block is provided with an adjustment bolt corresponding to the adjustment hole, the adjustment bolt extends into the adjustment hole and abuts against the adjustment spring.

[0012] In one embodiment, the end of the first positioning block away from the axis of the positioning body is arc-shaped, and when the end of the first positioning block near the axis of the positioning body abuts against the movable groove, the end of the first positioning block away from the axis of the positioning body is flush with the outer periphery of the positioning body.

[0013] In one embodiment, the second positioning block is generally annular and has a connecting slope. The connecting slope extends from the side wall of the second positioning block toward the side of the second positioning block away from the positioning body.

[0014] In one embodiment, the top of the positioning body is provided with a telescopic screw hole, and the second positioning block is provided with a stepped through hole corresponding to the telescopic screw hole. A telescopic bolt is provided in the stepped through hole, and the telescopic bolt passes through the stepped through hole and is screwed to the telescopic screw hole; the telescopic spring causes the telescopic bolt to slide relative to the stepped through hole.

[0015] In one embodiment, the top of the positioning body is provided with a connecting protrusion, and the second positioning block is provided with a connecting notch corresponding to the connecting protrusion. The connecting notch and the connecting protrusion together form a connecting cavity, and a telescopic spring is provided in the connecting cavity.

[0016] In one embodiment, the center of the second positioning block is provided with a connecting through hole.

[0017] In one embodiment, the positioning body has a mounting through hole at its axis.

[0018] In one embodiment, a flange is also included, with the positioning body screwed onto the flange and the first positioning block abutting against the flange.

[0019] The beneficial effects of this utility model are as follows: The pulley turning fixture provided by this utility model has an adjustment module set between the movable groove of the positioning body and the first positioning block. Under the action of the adjustment spring, the first positioning block can slide along the length direction of the limiting bolt in the movable groove, so that the outer diameter of the positioning body can be expanded, effectively improving the adaptability of the pulley turning fixture. Furthermore, the movable setting of the first positioning block enhances the adaptability of the pulley turning fixture by allowing it to float and fit against the back cavity of the pulley, providing effective support for the cavity surface and reducing the impact of gaps caused by inconsistent pulley blanks on turning, thereby improving turning quality. Simultaneously, by setting a second positioning block, the pulley turning fixture can abut against the end walls of pulleys of different depths, effectively improving the adaptability of the pulley turning fixture. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the positioning body in one embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of an embodiment of the present utility model;

[0024] Figure 4 for Figure 3 Exploded view;

[0025] Figure 5 for Figure 3 A magnified view of the centrally located subject;

[0026] Figure 6 for Figure 5 Exploded view.

[0027] Label Explanation:

[0028] 1. Pulley turning fixture; 11. Positioning body; 111. Movable groove; 1111. Limiting section; 1112. Movable clearance; 112. Limiting screw hole; 113. Adjusting hole; 114. Telescopic screw hole; 115. Mounting through hole; 116. Connecting protrusion; 12. First positioning block; 13. Adjusting module; 131. Limiting bolt; 132. Adjusting spring; 133. Telescopic bolt; 134. Adjusting bolt; 14. Second positioning block; 141. Telescopic spring; 142. Stepped through hole; 143. Connecting through hole; 144. Connecting notch; 145. Connecting inclined surface; 15. Spring clamp; 16. Tie rod; 17. Flange; 2. Pulley; 21. Back cavity; 22. Cavity surface. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] In the description of this utility model, it should be noted that the terminology... " center ” Vertical ” Horizontal ” "superior ” "Down ” "forward ” "back ” "Left ” "right ” Vertical ” "level ” "top ” "end ” "Inside ” "outside ” The orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terminology... " First ” "second ” Used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Please refer to Figures 1 to 6 A pulley turning fixture 1 is fitted into the back cavity 21 of the pulley 2, and includes: a positioning body 11, a first positioning block 12 and an adjustment module 13.

[0032] The positioning body 11 is generally disc-shaped. Movable grooves 111 are spaced around the outer periphery of the positioning body 11, with the width of each groove gradually decreasing from the edge of the positioning body 11 towards the axis. One end of the movable groove 111 near the axis extends to both sides with limiting sections 1111. Specifically, the movable groove 111 is a dovetail groove, with its wide end located at the edge of the positioning body 11 and its narrow end extending to both sides with limiting sections 1111, forming a T-shaped structure overall.

[0033] A first positioning block 12 is disposed corresponding to and slides within the movable groove 111. The first positioning block 12 extends into the limiting section 1111 and has a movable gap 1112 between it and the limiting section 1111. The shape of the first positioning block 12 matches the movable groove 111, and it is T-shaped overall. The first positioning block 12 gradually narrows from the outer end to the inner end, and the narrow end extends to both sides into the limiting section 1111. The movable gap 1112 between the first positioning block 12 and the limiting section 1111 allows the first positioning block 12 to slide along the movable groove 111. The shape of the movable groove 111 provides initial restriction for the first positioning block 12, limiting the sliding direction of the first positioning block 12 and preventing the first positioning block 12 from coming out of the movable groove 111.

[0034] The second positioning block 14 is disposed on the top of the positioning body 11, and a telescopic spring 141 is provided between the second positioning block 14 and the positioning body 11. Specifically, the second positioning block 14 is disposed on the side of the positioning body 11 near the pulley 2, and during installation, the second positioning block 14 abuts against the pulley 2. The telescopic spring 141 can adjust the position of the second positioning block 14 relative to the positioning body 11. By adjusting the elastic force of the telescopic spring 141, the depth to which the second positioning block 14 extends into the cavity 21 on the back of the pulley 2 after installation can be adjusted, so that the second positioning block 14 can abut against the end wall of the pulley 2 at different depths, effectively improving the adaptability of the pulley turning fixture 1.

[0035] The adjustment module 13 includes a limiting bolt 131 and an adjusting spring 132. The limiting bolt 131 screws the first positioning block 12 into the movable groove 111, allowing the first positioning block 12 to slide within the movable groove 111 along the limiting bolt 131. The adjusting spring 132 is positioned between the first positioning block 12 and the movable groove 111. Specifically, the limiting bolt 131 passes through the first positioning block 12 and is screwed onto the positioning body 11. The limiting bolt 131 is distributed along the central axis of the first positioning block 12 and the movable groove 111. The adjusting spring 132 pushes the first positioning block 12, causing it to move outward from the movable groove 111, thereby bringing the first positioning block 12 into close contact with the cavity surface 22 of the pulley 2.

[0036] The sliding direction of the first positioning block 12 is perpendicular to the sliding direction of the second positioning block 14. That is, in use, the first positioning block 12 slides along the diameter direction of the positioning body 11, and the second positioning block 14 slides along the thickness direction of the positioning body 11, so that the pulley turning fixture 1 can simultaneously obtain the ability to adjust the thickness and diameter. Thus, it can be adapted to pulleys of different specifications.

[0037] It is understood that the pulley turning fixture 1 provided by this utility model has an adjustment module 13 between the movable groove 111 of the positioning body 11 and the first positioning block 12. Under the action of the adjustment spring 132, the first positioning block 12 can slide along the length direction of the limiting bolt 131 in the movable groove 111, so that the first positioning block 12 can expand the outer diameter of the positioning body 11, effectively improving the adaptability of the pulley turning fixture 1. Furthermore, after the first positioning block 12 is movable, the adaptability of the pulley turning fixture 1 is improved by floating and fitting against the back cavity 21 of the pulley 2, providing effective support for the cavity surface 22, reducing the impact of the gap caused by the inconsistency of the pulley 2 blank on the turning, thereby improving the turning quality. At the same time, by setting the second positioning block 14, the pulley turning fixture 1 can abut against the end wall of the pulley 2 at different depths, effectively improving the adaptability of the pulley turning fixture 1.

[0038] Specifically, the pulley 2 is fixed in the positioning body 11 by the spring clamp 15. The spring clamp 15 is connected to the pull rod 16. Under the action of the spring clamp 15 and the pull rod 16, the pulley 2 is pulled towards the pulley turning fixture 1.

[0039] In one embodiment, at least three movable grooves 111 are provided. Specifically, three or more movable grooves 111 and first positioning blocks 12 are provided respectively, so that the pulley turning fixture 1 can provide individual support for different areas of the pulley 2, thereby compensating for the gap caused by the surface deviation of the pulley 2, improving support, and thus improving the turning quality.

[0040] In one embodiment, the adjustment module 13 further includes an adjustment bolt 134. A limiting screw hole 112 is provided in the movable groove 111 corresponding to the limiting bolt 131. Adjustment holes 113 are provided on both sides of the limiting screw hole 112, and an adjustment spring 132 is disposed within the adjustment hole 113. An adjustment bolt 134 is provided on the first positioning block 12 corresponding to the adjustment hole 113. The adjustment bolt 134 extends into the adjustment hole 113 and abuts against the adjustment spring 132. That is, the movable groove 111 is integrally provided with the limiting screw hole 112 and the adjustment hole 113, and the first positioning block 12 is correspondingly provided with the limiting bolt 131 and the adjustment bolt 134. The limiting bolt 131 is screwed into the limiting screw hole 112, and the adjustment bolt 134 extends into the adjustment hole 113 and abuts against the adjustment spring 132. This allows the first positioning block 12 to slide relative to the limiting bolt 131, while the first positioning block 12 and the adjusting bolt 134 remain relatively stationary. By adjusting the position of the adjusting bolt 134 on the first positioning block 12, the tension between the adjusting bolt 134 and the adjusting spring 132 is controlled. The limiting bolt 131 and the adjusting bolt 134 together restrict the sliding direction of the first positioning block 12, preventing the angle of the first positioning block 12 from shifting and ensuring the supporting function of the first positioning block 12 on the cavity surface 22.

[0041] In one embodiment, the end of the first positioning block 12 furthest from the axis of the positioning body 11 is arc-shaped. When the end of the first positioning block 12 closest to the axis of the positioning body 11 abuts against the movable groove 111, the end of the first positioning block 12 furthest from the axis of the positioning body 11 is flush with the outer periphery of the positioning body 11. That is, when the first positioning block 12 slides to the innermost side, the first positioning block 12 and the positioning body 11 form a disk as a whole. This arrangement ensures that the outer edge of the pulley turning fixture 1 remains flush after the first positioning block 12 slides inward, preventing the first positioning block 12 from protruding or sinking during installation and ensuring uniform support of the pulley turning fixture 1 for the cavity surface 22.

[0042] In one embodiment, the second positioning block 14 is generally annular and has a connecting inclined surface 145. The connecting inclined surface 145 extends from the side wall of the second positioning block 14 toward the side of the second positioning block 14 away from the positioning body 11. Specifically, the connecting inclined surface 145 is provided on the side of the second positioning block 14 that abuts against the end wall of the pulley 2. After setting the connecting inclined surface 145, the second positioning block 14 can enter the pulley 2 deeper and abut against the end wall, thereby improving the overall adaptability of the device while ensuring the support effect.

[0043] In one embodiment, the top of the positioning body 11 is provided with a telescopic screw hole 114, and the second positioning block 14 is provided with a stepped through hole 142 corresponding to the telescopic screw hole 114. A telescopic bolt 133 is provided in the stepped through hole 142, and the telescopic bolt 133 passes through the stepped through hole 142 and is screwed to the telescopic screw hole 114. The telescopic spring 141 causes the telescopic bolt 133 to slide relative to the stepped through hole 142. Specifically, after the telescopic bolt 133 is screwed in, the telescopic bolt 133 remains stationary relative to the positioning body 11. The second positioning block 14 is displaced relative to the telescopic bolt 133 under the action of the telescopic spring 141. The telescopic bolt 133 simultaneously restricts the displacement direction and stroke of the second positioning block 14, ensuring that the second positioning block 14 does not shift in angle or position, and ensuring that the pulley 2 can evenly transmit the tension of the pull rod 16 to the second positioning block 14 after installation, ensuring the overall support and preventing the pulley 2 from deforming due to excessive local stress.

[0044] In one embodiment, the top of the positioning body 11 is provided with a connecting protrusion 116, and the second positioning block 14 is provided with a connecting notch 144 corresponding to the connecting protrusion 116. The connecting notch 144 and the connecting protrusion 116 together form a connecting cavity, and the telescopic spring 141 is disposed in the connecting cavity. Specifically, the second positioning block 14 is generally disc-shaped and is fitted onto the connecting protrusion 116 of the positioning body 11. The side of the second positioning block 14 away from the pulley 2 has a connecting notch 144, and the telescopic spring 141 is disposed in the connecting cavity formed by the connecting notch 144 and the connecting protrusion 116. This arrangement allows the telescopic spring 141 to provide a balanced elastic force to the second positioning block 14, improving the overall stability.

[0045] In one embodiment, the second positioning block 14 has a connecting through hole 143 at its center. The spring clamp 15 is accommodated in the connecting through hole 143. This arrangement allows the pulley 2 to be connected to the pulley turning fixture 1 through the spring clamp 15 and the pull rod 16, ensuring normal installation.

[0046] In one embodiment, the positioning body 11 has a mounting through hole 115 at its axis. The mounting through hole 115 is provided corresponding to the spring clamp 15 and the pull rod 16 to ensure normal installation.

[0047] In one embodiment, a flange 17 is further included, with a positioning body 11 screwed onto the flange 17, and a first positioning block 12 abutting against the flange 17. Specifically, the first positioning block 12 is formed by wire cutting of the positioning body 11, the positioning body 11 is fixed to the flange 17, and the first positioning block 12 slides on the surface of the flange 17. More specifically, the flange 17 is detachably connected to the lathe, allowing the lathe to replace different specifications of pulley turning fixture 1 as needed.

[0048] Please refer to Figures 1 to 6 Embodiment 1 of this utility model is: a pulley turning fixture 1, which is fitted into the back cavity 21 of the pulley 2, comprising:

[0049] The positioning body 11 is generally disc-shaped. Six movable grooves 111 are arranged around the outer periphery of the positioning body 11 at intervals around the axis. The width of the movable grooves 111 gradually decreases from the edge of the positioning body 11 to the axis. The movable grooves 111 extend to both sides from the end near the axis of the positioning body 11 with limiting sections 1111.

[0050] The first positioning block 12 is set in the movable groove 111 and slides in the movable groove 111. The first positioning block 12 extends into the limiting section 1111 and has an movable gap 1112 between it and the limiting section 1111.

[0051] The adjustment module 13 includes a limiting bolt 131 and an adjustment spring 132. The limiting bolt 131 screws the first positioning block 12 into the movable groove 111, so that the first positioning block 12 slides along the limiting bolt 131 in the movable groove 111. The adjustment spring 132 is disposed between the first positioning block 12 and the movable groove 111.

[0052] The adjustment module 13 also includes an adjustment bolt 134. A limit screw hole 112 is provided in the movable groove 111 corresponding to the limit bolt 131. Adjustment holes 113 are provided on both sides of the limit screw hole 112. An adjustment spring 132 is provided in the adjustment hole 113. An adjustment bolt 134 is provided on the first positioning block 12 corresponding to the adjustment hole 113. The adjustment bolt 134 extends into the adjustment hole 113 and abuts against the adjustment spring 132.

[0053] The pulley 2 is fixed in the positioning body 11 by the spring clamp 15. The spring clamp 15 is connected to the pull rod 16. Under the action of the spring clamp 15 and the pull rod 16, the pulley 2 is pulled towards the pulley turning fixture 1.

[0054] In this embodiment, the end of the first positioning block 12 away from the axis of the positioning body 11 is arc-shaped. When the end of the first positioning block 12 close to the axis of the positioning body 11 abuts against the movable groove 111, the end of the first positioning block 12 away from the axis of the positioning body 11 is flush with the outer periphery of the positioning body 11.

[0055] In this embodiment, a second positioning block 14 is also included. The second positioning block 14 is disposed on the top of the positioning body 11, and a telescopic spring 141 is provided between the second positioning block 14 and the positioning body 11. The top of the positioning body 11 is provided with a telescopic screw hole 114, and the second positioning block 14 is provided with a stepped through hole 142 corresponding to the telescopic screw hole 114. A telescopic bolt 133 is provided in the stepped through hole 142, and the telescopic bolt 133 passes through the stepped through hole 142 and is screwed to the telescopic screw hole 114. The telescopic spring 141 causes the telescopic bolt 133 to slide relative to the stepped through hole 142.

[0056] In this embodiment, the second positioning block 14 has a connecting through hole 143 at its center, the positioning body 11 has an installation through hole 115 at its axis, and also includes a flange 17. The positioning body 11 is screwed onto the flange 17, and the first positioning block 12 abuts against the flange 17.

[0057] The working principle of this utility model is as follows: In actual use, the operator fixes the pulley 2 onto the pulley turning fixture 1 using the spring clamp 15 and the pull rod 16. During the fixing process, the pulley 2 presses against the second positioning block 14, the telescopic spring 141 is compressed, and the second positioning block 14 slides relative to the positioning body 11 until the first positioning block 12 is in full contact with the cavity surface 22. The second positioning block 14 and the first positioning block 12 abut against the wall of the pulley 2 and the cavity surface 22, respectively. Under the action of the adjusting spring 132, the first positioning block 12 slides towards the cavity surface 22, eliminating the gap between the first positioning block 12 and the cavity surface 22, and providing sufficient support for the cavity surface 22. After fixing is completed, the turning process can begin.

[0058] Although this document uses terms such as pulley turning fixture, positioning body, movable groove, limiting section, movable clearance, and limiting screw hole frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pulley turning tool which is fitted in a back cavity (21) of a pulley (2), characterized in that, include: The positioning body (11) is generally in the shape of a disc. The outer periphery of the positioning body (11) is provided with movable grooves (111) at intervals around the axis. The width of the movable grooves (111) gradually decreases from the edge of the positioning body (11) to the axis. The movable grooves (111) extend to both sides from the end near the axis of the positioning body (11) with limiting segments (1111). The first positioning block (12) is disposed corresponding to the movable groove (111) and slides within the movable groove (111). The first positioning block (12) extends into the limiting section (1111) and has a movable gap (1112) between it and the limiting section (1111). A second positioning block (14) is disposed on the top of the positioning body (11), and a telescopic spring (141) is provided between the second positioning block (14) and the positioning body (11); The adjustment module (13) includes a limiting bolt (131) and an adjusting spring (132). The limiting bolt (131) screws the first positioning block (12) into the movable groove (111), so that the first positioning block (12) slides along the limiting bolt (131) in the movable groove (111). The adjusting spring (132) is disposed between the first positioning block (12) and the movable groove (111). The sliding direction of the first positioning block (12) is perpendicular to the sliding direction of the second positioning block (14).

2. The pulley turning fixture according to claim 1, characterized by: At least three active slots (111) are provided.

3. The pulley turning fixture according to claim 1, wherein: The adjustment module (13) further includes an adjustment bolt (134). A limit screw hole (112) is provided in the movable groove (111) corresponding to the limit bolt (131). Adjustment holes (113) are provided on both sides of the limit screw hole (112). The adjustment spring (132) is disposed in the adjustment hole (113). The first positioning block (12) is provided with the adjustment bolt (134) corresponding to the adjustment hole (113). The adjustment bolt (134) extends into the adjustment hole (113) and abuts against the adjustment spring (132).

4. The pulley turning fixture of claim 1, wherein: The end of the first positioning block (12) away from the axis of the positioning body (11) is arc-shaped. When the end of the first positioning block (12) close to the axis of the positioning body (11) abuts against the movable groove (111), the end of the first positioning block (12) away from the axis of the positioning body (11) is flush with the outer periphery of the positioning body (11).

5. The pulley turning fixture of claim 1, wherein: The second positioning block (14) is generally ring-shaped and has a connecting inclined surface (145). The connecting inclined surface (145) extends from the side wall of the second positioning block (14) toward the side of the second positioning block (14) away from the positioning body (11).

6. The pulley turning fixture of claim 1, wherein: The top of the positioning body (11) is provided with a telescopic screw hole (114), and the second positioning block (14) is provided with a stepped through hole (142) corresponding to the telescopic screw hole (114). A telescopic bolt (133) is provided in the stepped through hole (142), and the telescopic bolt (133) passes through the stepped through hole (142) and is screwed to the telescopic screw hole (114). The telescopic spring (141) causes the telescopic bolt (133) to slide relative to the stepped through hole (142).

7. The pulley turning fixture of claim 1, wherein: The top of the positioning body (11) is provided with a connecting protrusion (116), and the second positioning block (14) is provided with a connecting notch (144) corresponding to the connecting protrusion (116). The connecting notch (144) and the connecting protrusion (116) together form a connecting cavity, and the telescopic spring (141) is disposed in the connecting cavity.

8. The pulley turning fixture of claim 5, wherein: The second positioning block (14) has a connecting through hole (143) at its center.

9. The pulley turning fixture of claim 1, wherein: The positioning body (11) has a mounting through hole (115) at its axis.

10. The pulley turning fixture of claim 1, wherein: It also includes a flange (17), the positioning body (11) is screwed onto the flange (17), and the first positioning block (12) abuts against the flange (17).

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