Ball cage type universal coupling

Abstract

The utility model discloses a ball cage type universal coupling, which relates to the field of couplings, and comprises a coupling, a connecting shaft and a sealing cover, an adjusting fixture block slides in an adjusting groove, a screw rod is contacted with the outer wall of the coupling to fix the coupling, an adjusting arm moves along with the adjusting fixture block while the adjusting fixture block slides, and a positioning effect on the coupling is achieved by matching with the adjusting fixture block. An oil storage box can store lubricating oil, an elastic ball exerts upward pressure on the second sealing bearing when the second sealing bearing rotates, a telescopic rod compresses a spring, a sponge block is extruded to enable the lubricating oil to flow into the inner side face of the second sealing bearing through a guide pipe, and automatic lubricating work on the coupler is achieved; lubricating oil is guided through a second flow guide groove between the two second sealing gaskets, lubricating oil flows into a first flow guide groove formed between the two first sealing gaskets on the inner side face of the sealing cylinder and the inner side face of the first sealing bearing through lubricating oil holes, and synchronous lubricating work on the coupler and the connecting shaft is achieved; and the coupler and the connecting shaft are effectively maintained.

Description

Technical Field

[0001] This utility model relates to the field of couplings, and in particular to a ball cage type universal coupling. Background Technology

[0002] As a key mechanical transmission component, the ball-cage universal coupling is widely used in many fields such as automobiles, construction machinery, and precision machine tools due to its advantages such as the ability to achieve large-angle deflection transmission, smooth transmission, and high efficiency. Its core function is to transmit power and motion between two misaligned shafts or shafts with an included angle.

[0003] A ball cage type universal coupling is proposed in patent publication number CN219623105U. This patent includes a connecting plate, connecting sleeve, steel ball, sealing ring, sealing expansion sleeve, clamp, connecting shaft, screw, spring washer, end cap, bearing ball, and ball seat. The center of the bearing ball is moved to the center of the concave spherical surface of the connecting shaft, keeping it concentric with the spherical surface at the end of the connecting shaft. A ball seat is also added, ensuring the center of the bearing ball is concentric with the center of the spherical surface at the end of the ball seat. This effectively reduces wear on the bearing ball during its oscillation, increasing its working stability. When severe wear of the ball seat and bearing ball affects normal operation, this device allows for easy replacement of the ball seat and bearing ball, saving maintenance time and reducing costs. Because the entire coupling does not need to be replaced, grease loss and consumption are minimal, ensuring the steel ball and sealing seat are always lubricated, thus extending the product's service life. However, this patent also has the following problems:

[0004] Traditional ball cage universal couplings typically rely on precise shaft hole fits or simple bolt fixing during installation. Their sealing systems lack multi-layered, dynamically adaptable protection designs and cannot form a long-lasting, reliable dynamic sealing barrier for critical external interfaces such as the connection between the coupling and the connecting shaft. They rely on the initial filling of grease for long-term operation and cannot cope with the performance degradation, loss, and contamination of grease caused by high temperature, centrifugal force, and other factors during long-term operation. They do not have the ability to actively monitor, replenish, and circulate lubricating oil. When the equipment is running at high speed, under heavy load, or under varying operating conditions, critical friction pairs (such as the first and second sealed bearings) may experience dry friction due to instantaneous oil film rupture, causing irreversible damage.

[0005] To address the above problems, a ball-cage type universal coupling needs to be designed to overcome them. Utility Model Content

[0006] The main objective of this invention is to provide a ball cage type universal coupling that can effectively solve the problems in the background art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A ball cage type universal coupling includes a coupling, a connecting shaft, and a sealing cover. One end of the coupling is connected to a limiting ring, and both ends of the limiting ring are connected to guide rods. The ends of the two guide rods away from the limiting ring are connected to sealing rings. A second sealing flange is connected to the inner side of the sealing ring, and a sealing cylinder is connected to the inner side of the second sealing flange. A first sealing flange is connected to the outer wall of the sealing cylinder away from the second sealing flange. An oil reservoir is connected to the outer wall of the sealing cylinder, and a sponge block is connected inside the oil reservoir. A telescopic rod is connected to the bottom of the sponge block, and a spring is connected to the outer wall of the telescopic rod. An elastic ball is connected to the bottom of the telescopic rod. A guide tube is connected to the bottom of the oil reservoir, and the bottom of the guide tube passes through the top of the sealing cylinder and is connected to a second sealing bearing.

[0009] As a preferred embodiment of this utility model, a plurality of second balls are connected to the inner side of the second sealed bearing, and a second sealing gasket is provided at the end of the inner side of the second sealed bearing away from the second balls. A second guide groove is formed between two adjacent second sealing gaskets. A first sealed bearing is connected to the end of the inner side of the sealing cylinder away from the coupling. A plurality of first balls are connected to the inner side of the first sealed bearing, and a first sealing gasket is connected to the end of the inner side of the first sealed bearing away from the first balls. A first guide groove is formed between two adjacent first sealing gaskets. An oil lubrication hole is formed on the inner side of the first guide groove and the oil lubrication hole. A sealing ring is fitted onto the end of the outer wall of the connecting shaft near the first sealed bearing.

[0010] As a preferred embodiment of this utility model, one side of the limiting ring is provided with an adjustment groove, the inner side of the adjustment groove is connected to an adjustment block, the end of the adjustment block away from the limiting ring is connected to an adjustment arm, and the end of the adjustment arm away from the adjustment block is connected to a support base.

[0011] As a preferred embodiment of this utility model, the first sealing flange and the second sealing flange are respectively sleeved on the outer wall of the sealing cylinder, the second sealing flange is fixedly connected to the sealing ring, the oil storage box and the sponge block are arranged inside the oil storage box, and the sponge block passes through the top of the guide tube and is fixedly connected to the telescopic rod.

[0012] As a preferred embodiment of this utility model, the telescopic rod is fixedly connected to the elastic ball, the bottom of the elastic ball contacts the outer wall of a plurality of second ball bearings, and two second sealing gaskets are sleeved on one end of the outer wall of the coupling.

[0013] As a preferred embodiment of this utility model, the first sealing bearing is fixedly installed on the inner side of the sealing cylinder at the end away from the first sealing flange, and the two first sealing gaskets are sleeved on the coupling and the connecting shaft connection, and the first sealing bearing is fixedly connected to the sealing ring.

[0014] In a preferred embodiment of this utility model, the sealing ring is rotatably connected to the guide rod, the guide rod is rotatably connected to the limiting ring, the limiting ring is slidably connected to the adjusting block, the adjusting block is threadedly fixedly connected to the adjusting arm, and the adjusting arm is threadedly fixedly connected to the support seat.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This ball cage universal coupling uses an adjusting block that slides within an adjusting groove, secured by a screw against the outer wall of the coupling. As the adjusting block slides, the adjusting arm moves accordingly, providing positioning for the coupling. A sealing ring and a second sealing flange fix the sealing cylinder at the connection between the coupling and the connecting shaft. A sealing cover and a first sealing flange ensure a tight seal between the coupling and the connecting shaft. An oil reservoir stores lubricating oil. An elastic ball applies upward pressure to the second sealing bearing as it rotates, compressing a spring in the telescopic rod and squeezing a sponge block to direct lubricating oil through a guide tube into the inner surface of the second sealing bearing, thus automatically lubricating the coupling. A second guide groove between the two second sealing gaskets guides the lubricating oil, and an oil-lubricating hole directs lubricating oil along the first guide groove between the two first sealing gaskets and the inner surface of the first sealing bearing, simultaneously lubricating the coupling and the connecting shaft, effectively maintaining their function. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the sealing ring installation structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the first sealed bearing installation structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the installation structure of the second sealed bearing of this utility model.

[0022] In the diagram: 1. Coupling; 2. Connecting shaft; 3. Sealing cover; 4. Limiting ring; 5. Guide rod; 6. Sealing ring; 7. Adjusting groove; 8. Adjusting block; 9. Adjusting arm; 10. Support seat; 11. First sealing flange; 12. Sealing cylinder; 13. Second sealing flange; 14. Sealing ring; 15. First sealing bearing; 16. First ball bearing; 17. First sealing gasket; 18. First guide groove; 19. Oil reservoir; 20. Guide tube; 21. Sponge block; 22. Telescopic rod; 23. Spring; 24. Elastic ball; 25. Second sealing bearing; 26. Second ball bearing; 27. Second sealing gasket; 28. Second guide groove; 29. ​​Lubrication hole. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] like Figures 1-4 As shown, a ball cage type universal coupling includes a coupling 1, a connecting shaft 2, and a sealing cover 3. One end of the coupling 1 is connected to a limiting ring 4, and both ends of the limiting ring 4 are connected to guide rods 5. The ends of the two guide rods 5 away from the limiting ring 4 are connected to sealing rings 6. The inner side of the sealing ring 6 is connected to a second sealing flange 13, and the inner side of the second sealing flange 13 is connected to a sealing cylinder 12. The outer wall of the sealing cylinder 12 away from the second sealing flange 13 is connected to a first sealing flange 11. The outer wall of the sealing cylinder 12 is connected to an oil reservoir 19, and the inside of the oil reservoir 19 is connected to a sponge block 21. The bottom of the sponge block 21 is connected to a telescopic rod 22, the outer wall of the telescopic rod 22 is connected to a spring 23, and the bottom of the telescopic rod 22 is connected to an elastic ball 24. The bottom of the oil reservoir 19 is connected to a guide tube 20, and the bottom of the guide tube 20 passes through the top of the sealing cylinder 12 and is connected to a second sealing bearing 25.

[0025] The first sealing flange 11 and the second sealing flange 13 are respectively fitted onto the outer wall of the sealing cylinder 12. The second sealing flange 13 is fixedly connected to the sealing ring 6. The oil storage box 19 and the sponge block 21 are set inside the oil storage box 19. The sponge block 21 passes through the top of the guide tube 20 and is fixedly connected to the telescopic rod 22. The telescopic rod 22 is fixedly connected to the elastic ball 24. The bottom of the elastic ball 24 contacts the outer wall of multiple second balls 26. Two second sealing gaskets 27 are fitted onto one end of the outer wall of the coupling 1.

[0026] Specifically, in this embodiment, a sealed bearing 15 is installed on the inner end of the sealing cylinder 12. Its inner ring is interference-fitted with the outer wall of the connecting shaft 2 through a sealing ring 14 to achieve rotation at the same speed. Its outer ring is fixed to the sealing cylinder 12. The first ball bearing 16 is disposed in the first sealed bearing 15 to ensure the concentricity and stability of the coupling 1 and the connecting shaft 2 under high-speed rotation. The first sealing gasket 17 is a pair of wear-resistant flexible material sealing rings made of nitrile rubber or fluororubber, which are sleeved at the connection between the coupling 1 and the connecting shaft 2 and located on the inner end face of the first sealed bearing 15. A first guide groove 18 is formed between the two first sealing gaskets 17 for the flow and distribution of lubricating oil.

[0027] The oil reservoir 19 is fixedly installed on the outer wall of the sealing cylinder 12 and stores lubricating oil inside. Its bottom outlet is connected to the extrusion assembly below via a guide tube 20. The extrusion sponge block 21 is located directly below the guide tube 20 and has high oil absorption and elasticity. One end of the telescopic rod 22 is fixed to the extrusion sponge block 21, and the other end passes through a fixed fulcrum. A spring 23 is sleeved on the telescopic rod 22, with one end abutting against the fixed fulcrum and the other end abutting against the mounting seat of the extrusion sponge block 21. Normally, it is in an extended state, pushing the extrusion sponge block 21 towards the oil reservoir 19. An elastic ball 24 is installed at the end of the telescopic rod 22, located above the second sealing bearing 25. The second sealing bearing 25... The outer ring is provided with a cam surface 26 that matches the contour of the elastic ball 24. The second sealing bearing 25 is installed inside the sealing cylinder 12 to support and stabilize the entire rotating component. A pair of second sealing gaskets 27 are installed on both sides of the second sealing bearing 25 to seal the bearing itself. The second guide groove 28 is opened between the two second sealing gaskets 27 to receive and guide lubricating oil. The lubrication hole 29 is opened on the cylinder wall of the sealing cylinder 12, located between the second guide groove 28 and the first guide groove 18, to guide the lubricating oil from inside the sealing cylinder 12 to the first sealing bearing 15.

[0028] The inner side of the second sealed bearing 25 is connected to a plurality of second balls 26. A second sealing gasket 27 is provided at the end of the inner side of the second sealed bearing 25 away from the second balls 26. A second guide groove 28 is provided between two adjacent second sealing gaskets 27. The inner side of the sealing cylinder 12 away from the coupling 1 is connected to the first sealed bearing 15. The inner side of the first sealed bearing 15 is connected to a plurality of first balls 16. A first sealing gasket 17 is connected at the end of the inner side of the first sealed bearing 15 away from the first balls 16. A first guide groove 18 is provided between two adjacent first sealing gaskets 17. An oil lubrication hole 29 is provided on the inner side of the first guide groove 18 and the oil lubrication hole 29. A sealing ring 14 is sleeved on the outer wall of the connecting shaft 2 near the end of the first sealed bearing 15.

[0029] One side of the limiting ring 4 is provided with an adjustment groove 7, and an adjustment block 8 is connected to the inner side of the adjustment groove 7. An adjustment arm 9 is connected to the end of the adjustment block 8 away from the limiting ring 4, and a support base 10 is connected to the end of the adjustment arm 9 away from the adjustment block 8.

[0030] The first sealing bearing 15 is fixedly installed on the inner side of the sealing cylinder 12 at the end away from the first sealing flange 11. The two first sealing gaskets 17 are sleeved on the connection between the coupling 1 and the connecting shaft 2. The first sealing bearing 15 is fixedly connected to the sealing ring 14.

[0031] The sealing ring 6 is rotatably connected to the guide rod 5, the guide rod 5 is rotatably connected to the limiting ring 4, the limiting ring 4 is slidably connected to the adjusting block 8, the adjusting block 8 is threadedly fixedly connected to the adjusting arm 9, and the adjusting arm 9 is threadedly fixedly connected to the support seat 10.

[0032] Specifically, in this embodiment, the limiting ring 4 is fixedly installed on the outer wall of the coupling 1, serving as a mounting base for other functional modules. A long, narrow adjusting groove 7 is formed along the axial direction on the outer circumference of the limiting ring 4. One end of the guide rod 5 is rotatably connected to the limiting ring 4, while the other end is suspended, used to guide and support the sealing ring 6. The adjusting block 8 is T-shaped or I-shaped, its dimensions matching the adjusting groove 7, and can slide freely along the adjusting groove 7, but cannot detach. The adjusting block 8 has an internal threaded hole, and one end of the adjusting arm 9 has an external thread, forming a threaded transmission pair with the internal threaded hole of the adjusting block 8. The other end of the adjusting arm 9 is also fixedly connected to the support seat 10 via threads. The bottom of the support seat 10 is designed as an arc surface to increase the contact area and friction with the outer wall of the connecting shaft 2. By rotating the adjusting arm 9, the adjusting block 8 can be driven to move back and forth within the adjusting groove 7 via the threaded transmission. When the adjusting arm 9 is rotated toward the center of the coupling 1, the bottom of the arc surface of the support seat 10 will gradually press against the outer wall of the connecting shaft 2, generating a huge radial clamping force, thereby achieving rapid and firm positioning and fixation of the coupling 1 on the connecting shaft 2.

[0033] In this process, coupling 1 and connecting shaft 2 begin to rotate at high speed. The second sealed bearing 25 rotates synchronously with coupling 1. The cam surface 26 on the bearing periodically pushes up the elastic ball 24. The elastic ball 24 drives the telescopic rod 22 to move downward, compressing the spring 23 and stretching the compression sponge block 21 at the lower end of the telescopic rod 22. A negative pressure is generated inside the sponge block, which draws lubricating oil from the oil reservoir 19 through the guide tube 20. When the protruding part of the cam surface 26 passes the elastic ball 24, the spring 23 releases its elastic force, pushing the telescopic rod 22 and the compression sponge block 21. The sponge block 21 is compressed and the lubricating oil it absorbs is forcefully squeezed out and injected into the second sealed bearing 25 for lubrication. After lubricating the second sealed bearing 25, the excess lubricating oil enters the second guide groove 28. Under the action of centrifugal force, the lubricating oil flows along the inner wall of the sealing cylinder 12 and is precisely guided to the first guide groove 18 through the lubrication hole 29. The lubricating oil is evenly distributed in the first guide groove 18, and at the same time lubricates the connection between the coupling 1 and the connecting shaft 2 and the first sealed bearing 15.

[0034] It should be noted that this utility model is a ball cage type universal coupling. During use, the coupling 1 and connecting shaft 2 rotate, and the second ball 26 inside the second sealed bearing 25 rolls with the high-speed rotation of the coupling. The elastic ball 24 is positioned outside the running track of the second ball 26. When the ball rolls past at high speed, it periodically impacts and compresses the elastic ball 24, generating an instantaneous upward pressure. The elastic ball 24 transmits this upward pressure to the telescopic rod 22 fixedly connected to it. The telescopic rod 22 moves upward, compressing the spring 23 sleeved on it. Simultaneously, the top of the telescopic rod 22 compresses the sponge block 21 soaked in lubricating oil. The sponge block 21 is subjected to… After compression, the lubricating oil stored inside is "pumped out" and precisely guided to the inside of the second sealed bearing 25 through the guide tube 20 connected to it, directly lubricating the second ball 26 and raceway. When the second ball 26 rolls over and the pressure on the elastic ball 24 disappears, the compressed spring 23 will release its elasticity, pushing the telescopic rod 22 and the elastic ball 24 to return to their original position. The sponge block 21 returns to its original shape, and a negative pressure is formed inside it, which will "absorb" new lubricating oil from the oil storage box 19 to prepare for the next oil pumping. This cycle repeats itself. As long as the coupling is rotating, the lubrication system will act like a small "heart", continuously pumping lubricating oil to the second sealed bearing 25.

[0035] After the lubricating oil enters the second sealed bearing 25 through the guide tube 20, part of it directly lubricates the balls, while the excess lubricating oil flows into the second guide groove 28 opened between the two second sealing gaskets 27. This guide groove can evenly distribute the lubricating oil around the bearing and guide it to flow further away, while preventing the lubricating oil from accumulating locally. The lubricating oil flowing out of the second guide groove 28 will continue to flow along the inner wall of the sealing cylinder 12. At the position of the first sealed bearing 15, the lubricating oil is guided into the first guide groove 18 between the two first sealing gaskets 17 through the lubrication hole 29 opened on the sealing cylinder 12. The first guide groove 18 is located at the connection between the coupling 1 and the connecting shaft 2, as well as the inner side of the first sealed bearing 15. In this way, the lubricating oil can simultaneously lubricate this key connection part and the first balls 16 of the first sealed bearing 15.

[0036] Compared to the couplings used in the prior art and common existing technologies, the operation is smoother and the initial wear is indeed less than that of traditional products. Maintenance personnel use a grease gun to add grease to the grease filler port of the coupling. The center of the bearing ball is moved to the center of the concave spherical surface of the connecting shaft, ensuring concentricity with the spherical surface at the end of the connecting shaft. This invention integrates an oil reservoir 19 on the outside of the coupling, filled with a sponge block 21 soaked in lubricating oil. When the coupling rotates, the second ball 26 periodically strikes the elastic ball 24, driving the telescopic rod 22 to compress the spring 23 and squeeze the sponge block 21, pumping out the lubricating oil. After the ball passes, the spring returns to its original position, and the sponge block 21 absorbs the oil, preparing for the next pumping operation. The lubricating oil first lubricates the second sealed bearing 25 through the guide tube 20, and then is guided to the first sealed bearing 15 and the connection between the coupling 1 and the connecting shaft 2 through the oil passage formed by the second guide groove 28, the lubrication hole 29 and the first guide groove 18, achieving multi-point synchronous lubrication. A quick positioning and clamping mechanism composed of a limit ring 4, an adjusting block 8, an adjusting arm 9 and a support seat 10 is added to facilitate installation and fixation. The lubricating oil is accurately delivered to the most critical friction parts (balls, bearings, and connections) to ensure lubrication effect and effectively prevent wear and overheating caused by poor lubrication. Continuous and good lubrication can significantly extend the service life of the internal moving parts of the coupling (such as balls and bearings).

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A ball cage type universal joint comprising a joint (1), a connecting shaft (2), a sealing cover (3), characterized in that: One end of the coupling (1) is connected to a limiting ring (4), and both ends of the limiting ring (4) are connected to guide rods (5). The ends of the two guide rods (5) away from the limiting ring (4) are connected to sealing rings (6). The inner surface of the sealing ring (6) is connected to a second sealing flange (13), and the inner surface of the second sealing flange (13) is connected to a sealing cylinder (12). The outer wall of the sealing cylinder (12) away from the second sealing flange (13) is connected to a first sealing flange (11). An oil storage box (19) is connected to the outer wall of the sealing cylinder (12). A sponge block (21) is connected inside the oil storage box (19). A telescopic rod (22) is connected to the bottom of the sponge block (21). A spring (23) is connected to the outer wall of the telescopic rod (22). An elastic ball (24) is connected to the bottom of the telescopic rod (22). A guide tube (20) is connected to the bottom of the oil storage box (19). The bottom of the guide tube (20) passes through the top of the sealing cylinder (12) and is connected to a second sealing bearing (25).

2. The ball cage type universal coupling according to claim 1, characterized in that: The inner side of the second sealed bearing (25) is connected to a plurality of second balls (26). The inner side of the second sealed bearing (25) away from the second balls (26) is provided with a second sealing gasket (27). A second guide groove (28) is provided between two adjacent second sealing gaskets (27). The inner side of the sealing cylinder (12) away from the coupling (1) is connected to a first sealed bearing (15). The inner side of the first sealed bearing (15) is connected to a plurality of first balls (16). The inner side of the first sealed bearing (15) away from the first balls (16) is connected to a first sealing gasket (17). A first guide groove (18) is provided between two adjacent first sealing gaskets (17). The inner side of the first guide groove (18) and the lubrication hole (29) is provided with a lubrication hole (29). A sealing ring (14) is sleeved on the outer wall of the connecting shaft (2) near the first sealed bearing (15).

3. The ball cage type universal coupling according to claim 1, characterized in that: One side of the limiting ring (4) is provided with an adjustment groove (7), and an adjustment block (8) is connected to the inner side of the adjustment groove (7). An adjustment arm (9) is connected to the end of the adjustment block (8) away from the limiting ring (4), and a support seat (10) is connected to the end of the adjustment arm (9) away from the adjustment block (8).

4. A ball cage type universal coupling according to claim 1, characterized in that: The first sealing flange (11) and the second sealing flange (13) are respectively fitted onto the outer wall of the sealing cylinder (12). The second sealing flange (13) is fixedly connected to the sealing ring (6). The oil storage box (19) and the sponge block (21) are arranged inside the oil storage box (19). The sponge block (21) passes through the top of the guide tube (20) and is fixedly connected to the telescopic rod (22).

5. A ball cage type universal coupling according to claim 2, characterized in that: The telescopic rod (22) is fixedly connected to the elastic ball (24), the bottom of the elastic ball (24) is in contact with the outer wall of a plurality of second balls (26), and two second sealing gaskets (27) are sleeved on one end of the outer wall of the coupling (1).

6. A ball cage type universal coupling according to claim 2, characterized in that: The first sealing bearing (15) is fixedly installed on the inner side of the sealing cylinder (12) away from the first sealing flange (11), and the two first sealing gaskets (17) are sleeved at the connection of the coupling (1) and the connecting shaft (2). The first sealing bearing (15) is fixedly connected to the sealing ring (14).

7. A ball cage type universal coupling according to claim 3, characterized in that: The sealing ring (6) is rotatably connected to the guide rod (5), the guide rod (5) is rotatably connected to the limiting ring (4), the limiting ring (4) is slidably connected to the adjusting block (8), the adjusting block (8) is threadedly fixedly connected to the adjusting arm (9), and the adjusting arm (9) is threadedly fixedly connected to the support seat (10).

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