A frame-type hanging rod with uniform force

Abstract

The present invention discloses a frame type suspension rod with uniform force, including a frame type suspension rod body and a first rotating rod. The top of the frame type suspension rod body is provided with a first rotating rod extending therein, and further includes: a first rotating rod, with a first conical wheel set key-connected to the bottom, and the first conical wheel set on the first rotating rod meshes with the first conical wheel set on the second rotating rod. The front and rear ends of the second rotating rod are connected to the inside of the frame type suspension rod body through bearings. A second conical wheel set is key-connected to the outer end of the second rotating rod, and the second rotating rod meshes with a threaded rod through the second conical wheel set; the threaded rod is connected to the inside of the frame type suspension rod body through a bearing in the middle. The frame type suspension rod with uniform force is equipped with hooks. Two groups of hooks are arranged in the middle of the frame type suspension rod body, so that while ensuring uniform force on the frame type suspension rod body, one more group can be hoisted during hoisting, thereby improving the hoisting efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of frame type suspension rods, and particularly to a frame type suspension rod with uniform stress. Background Art

[0002] When a crane hoists some objects, a frame type suspension rod is needed to expand the distance between steel ropes, so as to avoid damage to the hoisted object caused by extrusion of the steel ropes. Moreover, through the frame type suspension rod, different objects can be hoisted, making it suitable for most usage scenarios, and thus the frame type suspension rod has been widely used;

[0003] 1. Referring to an earring with the publication number of CN203110917U, the earring body is trapezoidal, making the structure of the earring body relatively firm and avoiding fracture caused by stress concentration in the triangular structure of the exhaust pipe earring during use. According to customer feedback, the exhaust pipe earring with a trapezoidal structure does not break after 200,000 times of tooling tests at -30°C, meeting the customer's needs and service life. However, there are still the following disadvantages:

[0004] In the actual use of the above device, although the strength of the earring is strengthened and the service life of the earring is increased, when the earring is in use, it is necessary to use the cooperation of screws and nuts, then insert them into the holes of the earring, and then the earring can limit the object. However, in this process, the nut needs to be screwed onto the screw, and when there are many earrings, each one needs to be operated, resulting in a significant reduction in efficiency;

[0005] 2. Referring to the integral self-loading and unloading earring with the publication number of CN208617210U, it is provided with a chassis girder, a rear earring and a front earring. The front earring is provided with a front earring fixing seat, and the front earring fixing seat is fixedly connected to the chassis girder through a fixing bolt at the lower end. The front earring fixing seat is welded to the hook arm at the lower end. The front earring fixing seat is provided with a front earring reinforcing rib. The rear earring is divided into an upper rear earring and a lower rear earring. The upper rear earring and the lower rear earring are respectively provided with an upper rear earring fixing seat and a lower rear earring fixing seat. Rear earring reinforcing rib plates are arranged on both the upper rear earring and the lower rear earring. The upper rear earring fixing seat and the lower rear earring fixing seat are respectively fixedly integrated with the chassis girder and the hook arm through rear earring fixing bolts. A gap is reserved between the upper rear earring fixing seat and the lower rear earring fixing seat, and a through fixing bolt is installed between the upper rear earring fixing seat and the lower rear earring fixing seat. The design structure of this integral self-loading and unloading earring is simple, easy to process, reduces the use cost, is convenient to install, has good safety, does not require other auxiliary facilities, and has high working efficiency. However, there are still the following disadvantages:

[0006] In the actual use of the above structure, although the cost of use is reduced, during the hoisting process, by limiting the steel rope on the lifting lug, since there is no anti-rotation device, the object to be lifted at the bottom of the steel rope may rotate due to the action of the wind, and then the object will drive the steel rope to rotate synchronously, resulting in the steel ropes being twisted together, thereby reducing the service life of the steel ropes. Summary of the Invention

[0007] The purpose of the present invention is to provide a frame type suspension rod with uniform force, so as to solve the problems of low fixing efficiency and easy damage to the steel rope in the current market proposed in the above background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A frame type suspension rod with uniform force, including a frame type suspension rod body and a first rotating rod, and the top of the frame type suspension rod body is provided with a first rotating rod extending therein;

[0009] It further includes:

[0010] The first rotating rod has a first conical wheel set key-connected to its bottom, and the first conical wheel set on the first rotating rod meshes with the first conical wheel set on the second rotating rod. The front and rear ends of the second rotating rod are connected to the inside of the frame type suspension rod body through bearings. The outer end of the second rotating rod is key-connected with a second conical wheel set, and the second rotating rod meshes with a threaded rod through the second conical wheel set;

[0011] The threaded rod is connected to the inside of the frame type suspension rod body through a bearing in the middle. The right end at the bottom of the threaded rod is meshed and connected with a first gear, and the middle of the first gear is key-connected with a first rotating rod. The top of the first rotating rod is connected to the inside of the frame type suspension rod body through a bearing, and the bottom of the first rotating rod extends out of the bottom of the frame type suspension rod body. The bottom of the first rotating rod extends into the inside of a first limiting rod. The bottom of the first rotating rod is connected to one end of a hook through meshing, and one end of the hook is slidably engaged with the inside of the first limiting rod. The lower end surface of the frame type suspension rod body is welded with a second limiting rod;

[0012] The left end of the threaded rod is meshed and connected with a second gear, and the middle of the second gear is key-connected with a second rotating rod. The top of the second rotating rod is connected to the inside of the frame type suspension rod body through a bearing, and the bottom of the second rotating rod extends out of the bottom end of the frame type suspension rod body. The bottom end of the second rotating rod penetrates through the inside of a receiving block and is slidably engaged with a sliding wheel. The top of the receiving block is welded to the bottom of the hook, and the inside of the receiving block is connected with a sliding wheel through a bearing. The left and right ends of the sliding wheel are meshed with racks, and the outer ends of the two racks are fixedly connected with moving blocks.

[0013] Preferably, the outer end of the second rotating rod is key-connected with a first pulley, and there are four groups of the second rotating rods, and the four groups of the second rotating rods are arranged in pairs. Two groups of the second rotating rods are connected by the first pulley, and the outer ends of the four groups of the second rotating rods are all key-connected with second conical wheel sets.

[0014] Through the above structural arrangement, the second rotating rods can rotate synchronously.

[0015] Preferably, the upper end surface of the hook is fixedly connected with a friction plate, and the friction plate is made of frosted material, and there are two groups of the friction plates. The friction plates are fixedly arranged on the inner wall between the second limiting rod and the first limiting rod.

[0016] Through the above structural arrangement, the friction plates can reduce the sliding of the steel rope.

[0017] Preferably, the bottom of the second limiting rod is arranged in a groove, and the diameter of the groove of the second limiting rod is equal to the diameter on the hook, and the height of the hook is equal to the height of the groove of the second limiting rod.

[0018] Through the above structural arrangement, the hook can fit inside the second limiting rod.

[0019] Preferably, there are two groups of the moving blocks, and a clamping rod is welded inside the front moving block, and the rear end of the clamping rod slides into the inside of the rear moving block. The clamping rod is made of reinforcing rib material.

[0020] Through the above structural arrangement, the moving blocks can move more stably.

[0021] Preferably, the right inner sides of the two groups of the moving blocks are fixedly connected with attaching blocks, and the inner sides of the two groups of attaching blocks are arranged in an arc shape.

[0022] Through the above structural arrangement, the attaching blocks can fit the steel rope.

[0023] Preferably, the bottom of the threaded rod is provided with threads, and the number of the threads on the threaded rod is the same as the number of the tooth blocks on the first gear and the second gear.

[0024] Through the above structural arrangement, the rotation of the threaded rod can drive the first gear and the second gear to rotate synchronously.

[0025] Preferably, the left end of the first rotating rod is inserted and engaged with a fixing rod, and the bottom of the fixing rod is provided with threads, and the bottom end of the fixing rod extends into the top of the frame-type hanging rod body to form a threaded connection.

[0026] Through the above structural arrangement, the first rotating rod can be prevented from rotating.

[0027] Preferably, an opening is provided inside the second rotating rod, and the opening inside the second rotating rod is slidably connected to the inside of the sliding wheel.

[0028] With the above structural arrangement, the sliding wheel can be moved.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: The frame type hanging rod with uniform force can make the force uniform, improve the efficiency, and also extend the service life of the steel rope. By providing a hook in the middle of the frame type hanging rod body, the efficiency can be improved while ensuring uniform force. And through the movement of the hook, the efficiency can be further enhanced. Moreover, by limiting the steel rope with the patch, the steel rope can be prevented from being intertwined with each other, thus reducing the life. The specific content is as follows:

[0030] (1) Hooks are provided. Two groups of hooks are provided in the middle of the frame type hanging rod body, so that while ensuring uniform force on the frame type hanging rod body, one more group can be hoisted during hoisting, thereby improving the hoisting efficiency;

[0031] (2) A first rotating rod is provided. By rotating the first rotating rod, the first rotating rod drives the threaded rod to rotate through the second conical pulley group. Then, the threaded rod drives the first rotating rod to rotate through the first gear. Then, the rotation of the first rotating rod drives the hook to lift and lower in the first limiting rod, so that one end of the hook can be engaged in the second limiting rod, thereby enabling the frame type hanging rod body to quickly limit the steel rope, and four groups can be moved simultaneously, thus greatly improving the efficiency;

[0032] (3) A moving block is provided. The rotation of the threaded rod drives the second gear to rotate. Then, the second gear drives the sliding wheel to rotate through the second rotating rod. Then, the rotation of the sliding wheel drives two groups of racks to move. Then, the racks drive the moving block to move, so that the steel rope can be attached to the patch, thereby preventing the steel ropes from being entangled with each other when the frame type hanging rod body is in use, and reducing the life of the steel rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic front sectional structure view of the present invention;

[0034] Figure 2 is a schematic side sectional structure view of the present invention;

[0035] Figure 3 is the present invention Figure 1 A enlarged structure view in the present invention;

[0036] Figure 4 is a schematic top sectional structure view of the threaded rod of the present invention;

[0037] Figure 5 For the present invention Figure 1 Schematic diagram of the enlarged structure of B in the present invention;

[0038] Figure 6 For the present invention Figure 1 Schematic diagram of the enlarged structure of C in the present invention;

[0039] Figure 7 Schematic diagram of the front sectional view of the moving block of the present invention;

[0040] Figure 8 Schematic diagram of the front sectional view of the rack of the present invention.

[0041] In the figure: 1. Frame type hanging rod body; 2. First rotating rod; 3. First conical pulley set; 4. Second rotating rod; 5. First pulley; 6. Second conical pulley set; 7. Threaded rod; 8. First gear; 9. First rotating rod; 10. First limiting rod; 11. Hook; 12. Friction plate; 13. Second limiting rod; 14. Second gear; 15. Second rotating rod; 16. Fixed rod; 17. Accommodating block; 18. Sliding wheel; 19. Rack; 20. Moving block; 21. Engaging rod; 22. Attaching block. Specific embodiments

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figure 1-8, the present invention provides a technical solution: a frame type hanging rod with uniform stress, including a frame type hanging rod body 1 and a first rotating rod 2, and the top of the frame type hanging rod body 1 is provided with the first rotating rod 2 extending therein; further comprising: the first rotating rod 2, a first conical wheel set 3 is key-connected to the bottom thereof, and the first conical wheel set 3 on the first rotating rod 2 meshes with the first conical wheel set 3 on the second rotating rod 4, and the front and rear ends of the second rotating rod 4 are connected to the inside of the frame type hanging rod body 1 through bearings, and a second conical wheel set 6 is key-connected to the outer end of the second rotating rod 4, and the second rotating rod 4 meshes with a threaded rod 7 through the second conical wheel set 6; a first belt pulley 5 is key-connected to the outer end of the second rotating rod 4, and there are four groups of the second rotating rods 4, and the four groups of the second rotating rods 4 are arranged in pairs, and two groups of the second rotating rods 4 are connected through the first belt pulley 5, and the outer ends of all four groups of the second rotating rods 4 are key-connected with the second conical wheel set 6, the threaded rod 7, the middle part of which is connected to the inside of the frame type hanging rod body 1 through a bearing, and the right end of the bottom of the threaded rod 7 is meshed with a first gear 8, and a first rotating rod 9 is key-connected to the middle of the first gear 8, the top of the first rotating rod 9 is connected to the inside of the frame type hanging rod body 1 through a bearing, and the bottom of the first rotating rod 9 extends out of the bottom of the frame type hanging rod body 1, and the bottom of the first rotating rod 9 extends into the inside of a first limiting rod 10, and the bottom of the first rotating rod 9 is connected to one end of a hook 11 through meshing, a friction plate 12 is fixedly connected to the upper end surface of the hook 11, and the friction plate 12 is made of frosted material, and there are two groups of the friction plates 12, the friction plates 12 are fixedly arranged on the inner wall between a second limiting rod 13 and the first limiting rod 10, and one end of the hook 11 is slidably and snap-fitted with the inside of the first limiting rod 10, and the lower end surface of the frame type hanging rod body 1 is welded with the second limiting rod 13, the bottom of the second limiting rod 13 is arranged in a groove, and the diameter of the groove of the second limiting rod 13 is equal to the diameter of the hook 11, and the height of the hook 11 is equal to the height of the groove of the second limiting rod 13;

[0044] Reference Figures 1 to 5, place the steel rope on the friction plate 12, and place the bottom of the steel rope inside the patch 22. Then rotate the first rotating rod 2 so that the first rotating rod 2 drives the first conical pulley set 3 to rotate. Subsequently, the rotation of the first conical pulley set 3 drives the second rotating rod 4 to rotate. Then, the rotation of the second rotating rod 4 drives the first pulley 5 to rotate. Subsequently, the two groups of second rotating rods 4 rotate synchronously through the rotation of the first pulley 5. Then, the second rotating rod 4 drives the threaded rod 7 to rotate through the second conical pulley set 6. Subsequently, the rotation of the threaded rod 7 drives the first gear 8 to rotate. Then, the rotation of the first gear 8 drives the first rotating rod 9 to rotate. Subsequently, the first rotating rod 9 drives the hook 11 to lift and lower inside the first limiting rod 10. Since the first limiting rod 10 and the hook 11 form a snap-in sliding connection, the hook 11 can only lift and lower. Then, the other end of the hook 11 moves into the second limiting rod 13, so that the two friction plates 12 can firmly fit the steel rope. Then, the four hooks 11 can lift and lower synchronously. Subsequently, the frame-type boom body 1 can be lifted with a uniform force and can lift one more group during hoisting, and can also limit the steel rope at the same time. Subsequently, the hoisting efficiency is improved. After the limiting is completed, insert the fixing rod 16 into the frame-type boom body 1 through the first rotating rod 2, and then rotate the fixing rod 16. Subsequently, the fixing rod 16 can limit the first rotating rod 2;

[0045] The threaded rod 7 is meshed and connected to the left end of the second gear 14. The middle of the second gear 14 is key-connected to the second rotating rod 15. The top of the second rotating rod 15 is connected to the inside of the frame-type boom body 1 through a bearing. The bottom of the second rotating rod 15 extends out of the bottom end of the frame-type boom body 1. The bottom end of the second rotating rod 15 penetrates through the inside of the receiving block 17 and forms a sliding snap connection with the sliding wheel 18. An opening is provided inside the second rotating rod 15, and the opening inside the second rotating rod 15 forms a sliding connection with the inside of the sliding wheel 18. The top of the receiving block 17 is welded to the bottom of the hook 11. The inside of the receiving block 17 is connected to the sliding wheel 18 through a bearing. The left end of the first rotating rod 2 is inserted and engaged with the fixing rod 16. The bottom of the fixing rod 16 is provided with a thread. The bottom end of the fixing rod 16 extends into the top of the frame-type boom body 1 to form a threaded connection. The left and right ends of the sliding wheel 18 are meshed with the rack 19. The bottom of the threaded rod 7 is provided with a thread, and the number of teeth on the thread of the threaded rod 7 is the same as that on the tooth blocks of the first gear 8 and the second gear 14. The outer ends of the two racks 19 are fixedly connected to the moving block 20. There are two moving blocks 20. The inside of the front moving block 20 is welded with a clamping rod 21. The rear end of the clamping rod 21 slides into the inside of the rear moving block 20. The clamping rod 21 is made of reinforcing rib material. The right inner sides of the two moving blocks 20 are fixedly connected to the patch 22, and the inner sides of the two patches 22 are arc-shaped;

[0046] Reference Figure 1, Figure 3 , Figure 4 , Figures 6 to 8 , when the threaded rod 7 rotates, it will drive the second rotating rod 15 to rotate, and then the second rotating rod 15 drives the sliding wheel 18 to rotate. Since the inside of the sliding wheel 18 is slidably engaged with the groove at the outer end of the second rotating rod 15, when the hook 11 moves, the sliding wheel 18 will lift and lower on the second rotating rod 15. Then the rotation of the sliding wheel 18 drives the rack 19 to move, so that the two racks 19 drive the moving block 20 to move, so that the engaging rod 21 inside the moving block 20 can extend into the inside of the other moving block 20, and then play a fixing role through the engaging rod 21. Then the two moving blocks 20 drive the attaching block 22 to move synchronously, and then the attaching block 22 can clamp the steel rope, thus preventing the steel rope from being twisted together during the hoisting of the frame type hanging rod body 1, and thus completing a series of operations.

[0047] The working principle of this embodiment: When using this frame type hanging rod with uniform force, first, refer to Figures 1 to 5 , place the steel rope on the friction plate 12, and place the bottom of the steel rope in the attaching block 22. Then rotate the second rotating rod 4 to drive the first pulley 5 to rotate, and then the second rotating rod 4 drives the threaded rod 7 to rotate through the second conical pulley set 6. Then, while the frame type hanging rod body 1 is under uniform force, it can hoist one more group during hoisting. After the limit is completed, insert the fixing rod 16 into the frame type hanging rod body 1 through the first rotating rod 2, and then the fixing rod 16 can limit the first rotating rod 2;

[0048] Refer to Figure 1 , Figure 3 , Figure 4 , Figures 6 to 8 , when the threaded rod 7 rotates, it will drive the second rotating rod 15 to rotate, which will cause the sliding wheel 18 to lift and lower on the second rotating rod 15. Then the rotation of the sliding wheel 18 drives the rack 19 to move, so that the two racks 19 drive the moving block 20 to move, and then the attaching block 22 can clamp the steel rope, thus preventing the steel rope from being twisted together during the hoisting of the frame type hanging rod body 1, and thus completing a series of operations.

[0049] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A frame type suspension rod with uniform stress, comprising a frame type suspension rod body (1) and a first rotating rod (2), wherein the top of the frame type suspension rod body (1) is provided with the first rotating rod (2) extending therein; It is characterized in that It further includes: The first rotating rod (2) has a first conical wheel set (3) key-connected to its bottom, and the first conical wheel set (3) on the first rotating rod (2) meshes with the first conical wheel set (3) on the second rotating rod (4). The front and rear ends of the second rotating rod (4) are connected to the inside of the frame type suspension rod body (1) through bearings. The outer end of the second rotating rod (4) is key-connected with a second conical wheel set (6), and the second rotating rod (4) meshes with a threaded rod (7) through the second conical wheel set (6); The threaded rod (7) is connected to the inside of the frame type suspension rod body (1) through a bearing in the middle. The right end of the bottom of the threaded rod (7) is meshed and connected with a first gear (8), and the middle of the first gear (8) is key-connected with a first rotating rod (9). The top of the first rotating rod (9) is connected to the inside of the frame type suspension rod body (1) through a bearing, and the bottom of the first rotating rod (9) extends out of the bottom of the frame type suspension rod body (1). The bottom of the first rotating rod (9) extends into the inside of a first limiting rod (10). The bottom of the first rotating rod (9) is connected to one end of a hook (11) through meshing, and one end of the hook (11) is slidably and snap-fitted with the inside of the first limiting rod (10). The lower end surface of the frame type suspension rod body (1) is welded with a second limiting rod (13); The left end of the threaded rod (7) is meshed and connected with a second gear (14), and the middle of the second gear (14) is key-connected with a second rotating rod (15). The top of the second rotating rod (15) is connected to the inside of the frame type suspension rod body (1) through a bearing, and the bottom of the second rotating rod (15) extends out of the bottom end of the frame type suspension rod body (1). The bottom end of the second rotating rod (15) penetrates through the inside of a receiving block (17) and is slidably snap-fitted with a sliding wheel (18). The top of the receiving block (17) is welded to the bottom of the hook (11). The inside of the receiving block (17) is connected with the sliding wheel (18) through a bearing, and racks (19) are meshed with the left and right ends of the sliding wheel (18). The outer ends of the two groups of racks (19) are fixedly connected with moving blocks (20).

2. The frame type suspension rod with uniform force according to claim 1, characterized in that: The outer end of the second rotating rod (4) is key-connected with a first belt pulley (5), and there are four groups of the second rotating rods (4), and the four groups of the second rotating rods (4) are arranged in pairs. Two groups of the second rotating rods (4) are connected through the first belt pulley (5), and the outer ends of the four groups of the second rotating rods (4) are all key-connected with second conical wheel sets (6).

3. A frame-type hanging rod with uniform stress according to claim 1, characterized in that: The upper end surface of the hook (11) is fixedly connected with a friction plate (12), and the friction plate (12) is made of frosted material. There are two groups of the friction plates (12), and the friction plates (12) are fixedly arranged on the inner walls between the second limiting rod (13) and the first limiting rod (10).

4. A frame-type hanging rod with uniform stress according to claim 1, characterized in that: The bottom of the second limiting rod (13) is provided with a groove, and the diameter of the groove of the second limiting rod (13) is equal to the diameter on the hook (11), and the height of the hook (11) is equal to the height of the groove of the second limiting rod (13).

5. The frame type hanging rod with uniform stress according to claim 1, characterized in that: Two groups of the moving blocks (20) are provided, and a clamping rod (21) is welded to the inner side of the front moving block (20), and the rear end of the clamping rod (21) slides into the inside of the rear moving block (20). The clamping rod (21) is made of reinforcing rib material.

6. The frame type hanging rod with uniform force according to claim 5, characterized in that: Two groups of the right inner sides of the moving blocks (20) are fixedly connected with attaching blocks (22), and the inner sides of the two groups of attaching blocks (22) are arc-shaped.

7. The frame type hanging rod with uniform force according to claim 1, characterized in that: The bottom of the threaded rod (7) is provided with threads, and the number of the threads on the threaded rod (7) is the same as the number of the tooth blocks on the first gear (8) and the second gear (14).

8. A frame type hanging rod with uniform force according to claim 1, characterized in that: The left end of the first rotating rod (2) is inserted and engaged with a fixing rod (16), the bottom of the fixing rod (16) is provided with threads, and the bottom end of the fixing rod (16) extends into the top of the frame type hanging rod body (1) to form a threaded connection.

9. The frame type hanging rod with uniform force according to claim 1, characterized in that: An opening is formed in the inner side of the second rotating rod (15), and the opening in the second rotating rod (15) is slidably connected with the inner side of the sliding wheel (18).

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