A testing fixture for the accuracy of counting jump ropes

Abstract

This utility model relates to the field of counting jump rope testing technology, and discloses a testing fixture for the counting accuracy of counting jump ropes, including a base, a clamping mechanism, and a rotation limiting device. A rotating motor is fixedly mounted on the base, and a rotating shaft is fixedly mounted on the output end of the rotating motor. The clamping mechanism is fixedly mounted on the rotating shaft and is used to clamp and fix the rope knot post. The rotation limiting device is mounted on the base and is used to limit the rotation of the handle. This solves the problems of time-consuming, labor-intensive, error-prone, inefficient, and inconsistent counting accuracy testing of counting jump ropes using manual methods in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of counting jump rope testing technology, specifically to a tooling for testing the counting accuracy of counting jump ropes. Background Technology

[0002] There are many counting jump rope products on the market, widely used in children's and adolescents' sports training. Referring to TYT2001-2015 General Requirements for National Physical Fitness Testing Equipment, section 4.2 of this standard requires jump rope tests to be performed at 0-400 times / 60 seconds, with an allowable error of ±1 second and ±1 jump.

[0003] Currently, the accuracy of jump rope counting is mostly verified by manual counting. The subject jumps with the rope, and the tester simultaneously times and records the number of jumps. While manual counting of 0-200 jumps / 60 seconds is feasible, increasing the rotation speed becomes difficult and prone to human error, making it impossible to accurately verify the error range. Furthermore, verifying the error range of multiple jump ropes simultaneously is not only time-consuming and labor-intensive, but also inefficient and inconsistent. Utility Model Content

[0004] The purpose of this invention is to provide a testing fixture for the counting accuracy of jump ropes, so as to solve the problems of time-consuming, labor-intensive, large error, low efficiency and poor consistency of the existing technology that uses manual testing of jump rope counting accuracy.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A testing fixture for the accuracy of counting jump ropes includes a base, a clamping mechanism, and a rotation limiting device. A rotating motor is fixedly mounted on the base, and a rotating shaft is fixedly mounted on the output end of the rotating motor. The clamping mechanism is fixedly mounted on the rotating shaft and is used to clamp and fix the knot post of the counting jump rope. The rotation limiting device is mounted on the base and is used to limit the rotation of the handle.

[0007] Furthermore, the rotation limiting device includes a lifting mechanism and a self-centering clamp. The lifting mechanism includes a mounting plate, a first lead screw, a first guide rod, and a lifting plate. The mounting plate is fixedly mounted on the base. The first lead screw and the first guide rod are both vertically arranged. The first lead screw is rotatably mounted on the mounting plate, and the first guide rod is fixedly mounted on the mounting plate. A first driving member is provided at one end of the first lead screw. The lifting plate has a first threaded hole for the first lead screw to pass through and a first through hole for the first guide rod to pass through. The self-centering clamp is mounted on the lifting plate.

[0008] Furthermore, the self-centering fixture includes a fixed ring, a rotating ring, and grippers. The fixed ring is fixedly mounted on the lifting plate, and the axis of the fixed ring is collinear with the axis of the rotating shaft. The rotating ring is rotatably mounted inside the fixed ring. There are at least three grippers evenly distributed around the circumference of the fixed ring. A control component is provided on the fixed ring, and the control component is used to drive all grippers to move synchronously closer to or away from the axis of the fixed ring.

[0009] Furthermore, the gripper is in the form of a thin sheet, with one end of the gripper rotatably mounted on the fixed ring and the middle part rotatably mounted on the rotating ring, and the other end of the gripper extending into the fixed ring to form a contact end.

[0010] Furthermore, the outer wall of the fixed ring is provided with a first arc-shaped through groove along the circumference. The control component includes a spring, an arc-shaped rod, and a connecting piece. The arc-shaped rod is fixedly installed between the inner walls of the first arc-shaped through groove. The connecting piece is located in the first arc-shaped through groove. One end of the connecting piece is slidably fitted on the arc-shaped rod, and the other end passes through the first arc-shaped through groove and is fixedly connected to the outer wall of the rotating ring. The spring is fitted on the arc-shaped rod, and both ends of the spring are respectively connected to the inner wall of the first arc-shaped through groove and the connecting piece.

[0011] Furthermore, a second arc-shaped through groove is provided on the outer wall of the fixed ring along the circumferential direction, and a control rod is fixedly provided on the outer wall of the rotating ring. The control rod is located in the second arc-shaped through groove, and the outer end of the control rod passes through the second arc-shaped through groove and extends out of the fixed ring. The control rod can slide in the second arc-shaped through groove.

[0012] Furthermore, a friction-enhancing column is fixedly provided at the contact end of the gripper.

[0013] Furthermore, the clamping mechanism includes a rotating seat and clamping plates. The rotating seat is fixedly connected to the rotating shaft. There are two clamping plates symmetrically distributed on both sides of the rotating shaft. The rotating seat is provided with a power component for driving the two clamping plates to move synchronously toward or away from the axis of the rotating shaft.

[0014] Furthermore, the power assembly includes a second lead screw and a second guide rod. The second lead screw is rotatably mounted on a rotating seat, and the second guide rod is fixedly mounted on the rotating seat. The axis of the second lead screw and the axis of the second guide rod are parallel. A second driving member is provided at one end of the second lead screw. Both clamping plates are provided with a second threaded hole for the second lead screw to pass through and a second through hole for the second guide rod to pass through. The second lead screw is a bidirectional screw, and the spiral threads at both ends of the second lead screw have opposite directions of rotation. The two clamping plates are respectively threaded onto the two spiral threads of the second lead screw.

[0015] Furthermore, it also includes a laser tachometer, which is used to test the actual number of rotations of the shaft or knot column.

[0016] The beneficial effects of this utility model are:

[0017] 1. The counting rope's knot post is clamped and fixed by a clamping mechanism, ensuring that the axis of the counting rope handle is collinear with the axis of the rotating shaft, thus supporting the handle. A rotation limit device is connected to the handle and limits its rotation. The rotating motor drives the rotating shaft and clamping mechanism to rotate, thereby causing the knot post to rotate. Under the action of the rotation limit device, the handle does not rotate, but the knot post and the handle rotate relative to each other. The counting accuracy of the counting rope can be tested by setting the number of rotations per minute of the rotating motor. Mechanical testing replaces manual testing, resulting in high testing efficiency, a small error range, and good test consistency.

[0018] 2. The lifting device allows testers to quickly and easily position the handle to a height where the clamping mechanism can precisely hold the knot post. It is also suitable for handles of different lengths of counting jump ropes, improving the positioning speed and indirectly increasing testing efficiency. The self-centering clamp securely clamps the handle, quickly and efficiently aligning the handle's axis with the axis of rotation. Furthermore, once clamped, the self-centering clamp provides support and rotational limit, reducing the clamping force on the knot post. This eliminates the need for the clamping mechanism to support the handle by holding the knot post, minimizing the possibility of damage. The self-centering clamp is also applicable to handles of different diameters of counting jump ropes, making it widely applicable.

[0019] 3. By setting up a laser speed meter as a third-party mechanism for testing the rotation speed, the slight deviation caused by the rotation error of the rotating motor itself can be avoided, thus affecting the accuracy of the judgment result. Set any value within the range of 0-400 / 60s. If the laser speed meter test result is consistent with the count rope result, or the deviation is ±1 time, it indicates that the counting accuracy of the count rope meets the requirements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a counting rope accuracy testing fixture according to the present invention;

[0021] Figure 2 This is a schematic diagram of the self-centering clamp in this utility model;

[0022] Figure 3 This is a schematic diagram of the control component in this utility model;

[0023] Figure 4 This is a schematic diagram of the clamping mechanism in this utility model.

[0024] in,

[0025] 1. Base; 2. Handle; 3. Rope knot post; 4. Mounting plate; 5. First lead screw; 6. First guide rod; 7. First driving component; 8. Lifting plate; 9. Fixing ring; 10. Rotating ring; 11. Gripper; 12. Friction-enhancing post; 13. First arc-shaped through groove; 14. Second arc-shaped through groove; 15. Arc-shaped rod; 16. Connecting piece; 17. Spring; 18. Control rod; 19. Rotating motor; 20. Rotating shaft; 21. Rotating seat; 22. Second lead screw; 23. Second guide rod; 24. Clamping plate; 25. Second driving component. Detailed Implementation

[0026] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0028] In existing related technologies, counting jump ropes typically consist of a rope, a handle 2, and a counting mechanism installed inside the handle 2. The rotating rod of the counting mechanism extends out of the handle 2 and forms a knot post 3. The rotating rod and the handle 2 are rotated together by bearings. The knot post 3 of mainstream counting jump ropes on the market is usually a cylindrical, hemispherical, or a combination structure formed by molding both cylindrical and hemispherical shapes. The knot post 3 has a rope hole, and the end of the rope is threaded and fixed on the knot post 3.

[0029] This embodiment proposes a testing fixture for the accuracy of counting jump ropes, such as... Figures 1 to 4As shown, the device includes a base 1, a clamping mechanism, and a rotation limiting device. A rotating motor 19 is fixedly mounted on the base 1 by bolts. The output end of the rotating motor 19 is fixedly connected to a rotating shaft 20, which is rotatably mounted on the base 1 via bearings. In this embodiment, the rotating shaft 20 is vertically positioned. The clamping mechanism is fixedly mounted on the rotating shaft 20 and is used to clamp and fix the rope knot post 3. The rotation limiting device is mounted on the base 1. When the clamping mechanism clamps the rope knot post 3, the axis of the handle 2 is collinear with the axis of the rotating shaft 20. The rotation limiting device is connected to the handle 2 and is used to limit the rotation of the handle 2. In this embodiment, the rope knot post 3 is clamped and fixed by the clamping mechanism, which can support the entire handle 2. The rotating motor 19 drives the rotating shaft 20 and the clamping mechanism to rotate, thereby driving the rope knot post 3 to rotate. Under the action of the rotation limit device, the handle 2 does not rotate, and the rope knot post 3 rotates relative to the handle 2. Thus, by setting the number of rotations per minute of the rotating motor 19 and comparing it with the count of the counting rope handle 2, the accuracy of the counting rope can be measured. The mechanical testing replaces manual testing, which has high testing efficiency, small error range, and good test consistency.

[0030] The rotation limiting device includes a lifting mechanism and a self-centering clamp. The lifting mechanism includes a mounting plate 4, a first lead screw 5, a first guide rod 6, and a lifting plate 8. The mounting plate 4 is fixedly mounted on the base 1. In this embodiment, the mounting plate 4 is L-shaped. The vertical section of the mounting plate 4 is fixedly connected to the top of the base 1. The horizontal section of the mounting plate 4 is used to mount the first lead screw 5 and the first guide rod 6. Both the first lead screw 5 and the first guide rod 6 are vertically arranged. The first lead screw 5 is rotatably mounted between the horizontal section of the mounting plate 4 and the upper surface of the base 1 through a bearing. The first guide rod 6 is fixedly mounted between the horizontal section of the mounting plate 4 and the upper surface of the base 1. A first driving member 7 is provided at one end of the first lead screw 5. The first driving member 7 can be a crank handle. In this embodiment, the first driving member 7 is a motor. The top end of the first lead screw 5 passes through the horizontal section of the mounting plate 4 and is fixedly connected to the output end of the first driving member 7. The lifting plate 8 has a first threaded hole for the first lead screw 5 to pass through and a first through hole for the first guide rod 6 to pass through. The self-centering clamp is mounted on the lifting plate 8. In this embodiment, the first driving member 7 drives the first lead screw 5 to rotate, thereby driving the lifting plate 8 and the self-centering clamp to rise and fall vertically.

[0031] In practice, the self-centering fixture can be a commercially available three-jaw or four-jaw self-centering fixture. In this embodiment, the self-centering fixture includes a fixed ring 9, a rotating ring 10, and jaws 11. The outer wall of the fixed ring 9 is fixedly mounted on the lifting plate 8. The rotating ring 10 is rotatably mounted inside the fixed ring 9 via bearings. The axis of the rotating ring 10, the axis of the fixed ring 9, and the axis of the rotating shaft 20 are collinear. There are at least three jaws 11, which are evenly distributed around the circumference of the fixed ring 9. A control component is provided on the fixed ring 9. The control component is used to drive all jaws 11 to move synchronously closer to or away from the axis of the fixed ring 9. In this embodiment, three jaws 11 are preferably used. Through the control component, all jaws 11 can clamp and fix cylindrical workpieces of different diameters, enabling self-centering clamping and fixing of counting jump rope handles 2 of different diameters available on the market.

[0032] The gripper 11 is a thin sheet. The outer end of the gripper 11 is rotatably mounted on the edge of the fixed ring 9 via a pin. The middle part of the gripper 11 is rotatably mounted on the rotating ring 10 via a pin. The inner end of the gripper 11 extends into the fixed ring 9 and forms a contact end. In this embodiment, the upper surface of the rotating ring 10 is flush with the upper surface of the fixed ring 9. The gripper 11 is located on the upper surface of the fixed ring 9 and is parallel to the upper surface of the fixed ring 9. The gripper 11 extends in an arc shape from the outside to the inside. By rotating the rotating ring 10, the inner ends of the three grippers 11 can move synchronously closer to or further away from the axis of the fixed ring 9, thereby clamping or releasing the handle 2.

[0033] The outer wall of the fixed ring 9 has a first arc-shaped through groove 13 circumferentially formed. The control assembly includes a spring 17, an arc-shaped rod 15, and a connecting piece 16. The arc-shaped rod 15 is fixedly installed between the inner walls of the first arc-shaped through groove 13. In this embodiment, the cross-section of the arc-shaped rod 15 is circular, and its center falls on the axis of the fixed ring 9. The connecting piece 16 is located in the first arc-shaped through groove 13. One end of the connecting piece 16 is slidably fitted on the arc-shaped rod 15, and the other end passes through the first arc-shaped through groove 13 and is fixedly connected to the outer wall of the rotating ring 10. The spring 17 is fitted on the arc-shaped rod 15, and both ends of the spring 17 are fixedly connected to the inner wall of the first arc-shaped through groove 13 and the connecting piece 16, respectively.

[0034] In one optional embodiment, the spring 17 is a compression spring. In its compressed state, the spring 17 consistently pushes the connecting piece 16, causing it to tend to move on the arc-shaped rod 15. This means the rotating ring 10 always tends to rotate under the action of the spring 17, and this rotational tendency causes the inner ends of the three grippers 11 to synchronously approach the axis of the fixed ring 9. When it is necessary to clamp and fix the handle 2 to be tested, the rotating ring 10 is rotated by the connecting piece 16, and the spring 17 is further compressed. The three grippers 11 then move outwards, vertically placing the handle 2 into the clamping area. After releasing the connecting piece 16, the three grippers 11 automatically clamp and fix the handle 2 under the elastic force of the spring 17, and the axis of the handle 2 automatically aligns with the axis of the rotating shaft 20.

[0035] In another optional embodiment, the spring 17 is a tension spring. When stretched, the spring 17 constantly pulls the connecting piece 16, causing it to tend to move on the arc-shaped rod 15. That is, the rotating ring 10 always tends to rotate under the action of the spring 17. This rotational tendency causes the inner ends of the three grippers 11 to synchronously approach the axis of the fixed ring 9. When it is necessary to clamp and fix the handle 2 to be tested, the rotating ring 10 is rotated by the connecting piece 16, and the spring 17 is further stretched. The three grippers 11 then move outward, vertically placing the handle 2 into the clamping area. The connecting piece 16 is released, and under the elastic force of the spring 17, the three grippers 11 automatically clamp and fix the handle 2, and the axis of the handle 2 automatically aligns with the axis of the rotating shaft 20.

[0036] In this embodiment, as shown in the appendix Figure 3 As shown, this embodiment illustrates the structural design when spring 17 is a tension spring. It should be understood that when spring 17 is a compression spring, in addition to the... Figure 3 In the middle, the compression spring should be located on the right side of the connecting piece 16.

[0037] The outer wall of the fixed ring 9 is provided with a second arc-shaped through groove 14 along the circumference. The outer wall of the rotating ring 10 is fixed with a control rod 18 along the radial direction. The control rod 18 is located in the second arc-shaped through groove 14. The outer end of the control rod 18 passes through the second arc-shaped through groove 14 and extends out of the fixed ring 9. The control rod 18 can slide in the second arc-shaped through groove 14. In this embodiment, the second arc-shaped through groove 14 and the first arc-shaped through groove 13 are arranged axially at intervals along the fixing ring 9. On the one hand, the control rod 18 abuts against the side wall of the second arc-shaped through groove 14, which can limit the maximum and minimum rotation positions of the rotating ring 10 and the connecting piece 16. On the other hand, the control rod 18 is convenient for the tester to operate actively. By moving the control rod 18, the control rod 18 slides in the second arc-shaped through groove 14, and the control rod 18 drives the rotating ring 10 to rotate. The rotating ring 10 drives the connecting piece 16 to rotate, thereby stretching or compressing the spring 17. When the rotating ring 10 rotates, the three grippers 11 spread outward. When the control rod 18 is released, the connecting piece 16, the rotating ring 10 and the control rod 18 automatically rotate under the action of the spring 17 until the three grippers 11 clamp and fix the handle 2. Since the handle 2 has a small mass, the elastic force of the spring 17 is sufficient to clamp and fix it. After clamping and fixing, the axis of the handle 2 is collinear with the axis of the rotating shaft 20.

[0038] The contact end of the gripper 11 is fixedly provided with a friction-enhancing column 12, which increases the contact area and friction between the inner end of the gripper 11 and the handle 2, and further increases the stability of clamping the handle 2.

[0039] The clamping mechanism includes a rotating seat 21 and a clamping plate 24. The rotating seat 21 is fixedly connected to the rotating shaft 20. In this embodiment, the rotating seat 21 and the rotating shaft 20 can be connected by a key. There are two clamping plates 24, which are symmetrically distributed on both sides of the rotating shaft 20. The rotating seat 21 is provided with a power component for driving the two clamping plates 24 to move synchronously toward or away from the axis of the rotating shaft 20.

[0040] In practice, the power assembly can be two cylinders, with the telescopic ends of the two cylinders fixedly connected to two clamping plates 24 respectively. The telescopic movement of the cylinders drives the two clamping plates 24 to move synchronously. In this embodiment, the power assembly includes a second lead screw 22 and a second guide rod 23. The second lead screw 22 is rotatably mounted on the rotating seat 21, and the second guide rod 23 is fixedly mounted on the rotating seat 21. Both the second lead screw 22 and the second guide rod 23 are horizontally arranged, and the axis of the second lead screw 22 is parallel to the axis of the second guide rod 23. A second driving member 25 is provided at one end of the second lead screw 22. In this embodiment, the second driving member 25 is a motor. The output end of the second driving member 25 is fixedly connected to one end of the second lead screw 22. Both clamping plates 24 are provided with a second threaded hole for the second lead screw 22 to pass through and a second through hole for the second guide rod 23 to pass through. The second lead screw 22 is a bidirectional screw, and the spiral threads at both ends of the second lead screw 22 rotate in opposite directions. The two clamping plates 24 are respectively threaded onto the two spiral threads of the second lead screw 22. The second drive component 25 drives the second lead screw 22 to rotate, and the two clamping plates 24 move towards or away from the axis of the rotating shaft 20 in sync. The structure is simple and easy to use, and it can clamp and fix rope knot posts 3 of different diameters.

[0041] It also includes a laser tachometer (not shown in the figure), which is used to test the actual number of rotations of the rotating shaft 20 or the knot column 3. Laser tachometers can be purchased directly from the market, and the structure and working principle of laser tachometers are already fully disclosed in existing technology, so they will not be described in detail here. In this embodiment, since the rotating motor 19 itself has accuracy errors, and the errors vary depending on the type of rotating motor 19, in order to avoid the influence of the errors of the rotating motor 19 itself, this embodiment uses a third-party organization to conduct speed testing. Specifically, a certain position of a rotating workpiece is selected as the measurement point, and a special reflective sticker for the laser tachometer is affixed to the measurement point. During the test, the tester holds the laser tachometer and aligns the emitted red laser point with the affixed reflective mark, keeping the laser tachometer at a constant temperature, and measures the actual number of rotations of the rotating motor 19.

[0042] Working principle:

[0043] During testing, remove the rope from the handle 2 to be tested, attach the reflective sticker of the laser velocimeter to the rotating shaft 20, and turn the lever. The three grippers 11 will spread outwards. Place the handle 2 vertically downwards into the clamping area, release the lever, and under the action of the spring 17, the three grippers 11, together with the friction-enhancing column 12, will clamp and fix the handle 2, providing support for the handle 2 and forming a rotation limit. At this time, the axis of the handle 2 is collinear with the axis of the rotating shaft 20. Adjust the height of the handle 2 through the lifting mechanism until the clamping plate 24 is aligned with the rope knot column 3. The power component will cause the two clamping plates 24 to clamp the rope knot column 3, completing the positioning of the handle 2, and the test can begin. According to the test requirements, the rotation speed of the rotating motor 19 is set to 0-400 times / 60 seconds. The laser test meter is aligned with the reflective sticker and kept stable. The rotating motor 19 is started, and the rotating motor 19 drives the rope knot column 3 to rotate for one minute. The laser speed meter measures the actual number of rotations of the rotating motor 19. Then, it is compared with the counting rope technology. If the laser speed meter test result is consistent with the counting rope result, or the deviation is ±1 time, it indicates that the counting accuracy of the counting rope meets the requirements.

[0044] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A counting jump rope count accuracy test fixture characterized by: The device includes a base, a clamping mechanism, and a rotation limiting device. A rotating motor is fixedly mounted on the base, and a rotating shaft is fixedly mounted on the output end of the rotating motor. The clamping mechanism is fixedly mounted on the rotating shaft and is used to clamp and fix the rope knot column. The rotation limiting device is mounted on the base and is used to limit the rotation of the handle.

2. The count accuracy test fixture for a count jump rope according to claim 1, wherein: The rotation limiting device includes a lifting mechanism and a self-centering clamp. The lifting mechanism includes a mounting plate, a first lead screw, a first guide rod, and a lifting plate. The mounting plate is fixedly mounted on the base. The first lead screw and the first guide rod are both vertically arranged. The first lead screw is rotatably mounted on the mounting plate, and the first guide rod is fixedly mounted on the mounting plate. A first driving component is provided at one end of the first lead screw. The lifting plate has a first threaded hole for the first lead screw to pass through and a first through hole for the first guide rod to pass through. The self-centering clamp is mounted on the lifting plate.

3. The count accuracy test fixture for a count jump rope according to claim 2, wherein: The self-centering clamp includes a fixed ring, a rotating ring, and grippers. The fixed ring is fixedly mounted on the lifting plate, and the axis of the fixed ring is collinear with the axis of the rotating shaft. The rotating ring is rotatably mounted inside the fixed ring. There are at least three grippers, which are evenly distributed around the circumference of the fixed ring. A control component is provided on the fixed ring, which is used to drive all grippers to move synchronously closer to or away from the axis of the fixed ring.

4. The count accuracy test fixture for a count jump rope according to claim 3, wherein: The gripper is in the shape of a thin sheet. One end of the gripper is rotatably mounted on the fixed ring, and the middle part is rotatably mounted on the rotating ring. The other end of the gripper extends into the fixed ring and forms a contact end.

5. The count accuracy test fixture for a count jump rope according to claim 4, wherein: The outer wall of the fixed ring is provided with a first arc-shaped through groove along the circumference. The control component includes a spring, an arc-shaped rod, and a connecting piece. The arc-shaped rod is fixedly installed between the inner walls of the first arc-shaped through groove. The connecting piece is located in the first arc-shaped through groove. One end of the connecting piece is slidably fitted on the arc-shaped rod, and the other end passes through the first arc-shaped through groove and is fixedly connected to the outer wall of the rotating ring. The spring is fitted on the arc-shaped rod, and both ends of the spring are respectively connected to the inner wall of the first arc-shaped through groove and the connecting piece.

6. The count accuracy test fixture for a count jump rope according to claim 4, wherein: The outer wall of the fixed ring is provided with a second arc-shaped through groove along the circumference. The outer wall of the rotating ring is fixed with a control rod. The control rod is located in the second arc-shaped through groove. The outer end of the control rod passes through the second arc-shaped through groove and extends out of the fixed ring. The control rod can slide in the second arc-shaped through groove.

7. The count accuracy test fixture for a count jump rope according to claim 4, wherein: The contact end of the gripper is fixedly provided with a friction-enhancing column.

8. The count accuracy test fixture for a count jump rope according to claim 1, wherein: The clamping mechanism includes a rotating seat and clamping plates. The rotating seat is fixedly connected to the rotating shaft. There are two clamping plates symmetrically distributed on both sides of the rotating shaft. The rotating seat is provided with a power component for driving the two clamping plates to move synchronously toward or away from the axis of the rotating shaft.

9. The count accuracy test fixture for a count jump rope according to claim 8, wherein: The power assembly includes a second lead screw and a second guide rod. The second lead screw is rotatably mounted on a rotating seat, and the second guide rod is fixedly mounted on the rotating seat. The axis of the second lead screw and the axis of the second guide rod are parallel. A second driving element is provided at one end of the second lead screw. Both clamping plates are provided with a second threaded hole for the second lead screw to pass through and a second through hole for the second guide rod to pass through. The second lead screw is a bidirectional screw, and the spiral threads at both ends of the second lead screw turn in opposite directions. The two clamping plates are respectively threaded onto the two spiral threads of the second lead screw.

10. The count accuracy test fixture for a count jump rope according to claim 1, wherein: It also includes a laser tachometer, which is used to test the actual number of rotations of a shaft or knot column.

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