Self-anti-backlash structure for roller cam rotary table transmission

Abstract

The utility model discloses a self-clearance eliminating structure of roller cam rotary table transmission, and particularly relates to the field of cam roller rotary tables, the self-clearance eliminating structure comprises a cam and a cam transmission shaft located at the bottom of the cam, the outer surface of the cam is provided with a thread groove, an inner cavity of the thread groove is provided with a buffer groove, and the middle of the thread groove is provided with a thread sealing block. Limiting rods are fixedly connected to the two sides of an inner cavity of the threaded sealing block, a limiting top ring is arranged in the middle of the threaded sealing block, and a spring is arranged at the bottom of the limiting top ring. Firstly, the arranged cam rollers drive the limiting top ring to extrude the spring, the distance between the cam rollers and the cam can be adjusted, and therefore the distance between the two cam rollers is adjusted, the distance between the cam transmission shaft and the cam is adjusted through an external mechanism, extrusion on the cam rollers can be achieved, and the effect of automatically eliminating a transmission gap is achieved. The transmission precision can be adjusted without replacing the cam and the cam transmission shaft, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of roller cam turntable transmission, and more specifically, the utility model relates to a self-eliminating clearance structure for roller cam turntable transmission. Background Art

[0002] The precision turntable is a key component of a machine tool. The rotary precision of the turntable determines the overall performance of the machine tool and the precision of the machined parts. Commonly used turntables generally use a servo motor to drive a single set of worm gears to rotate through a coupling, and then rotate the structure of the turntable. However, the worm gear of the worm gear turntable wears relatively fast, and the machining precision requirements for the worm during the machining process are strict. After assembly, the lateral clearance of single-tooth meshing cannot be adjusted, resulting in too large a clearance in the worm drive, which will affect the machining precision of the turntable.

[0003] In the prior art, a cam roller turntable is used to overcome the clearance problem of worm gear meshing transmission. However, the cam rollers of the existing cam roller turntables are fixed around the cam. When wear occurs during long-term use, a clearance will be generated between the cam drive shaft and the transmission of the cam rollers, thus affecting the transmission precision, and further affecting the machining precision of the turntable. Only by replacing the cam drive shaft or cam rollers can the transmission precision be adjusted, and it is inconvenient to reduce the transmission clearance through adjustment. Therefore, a self-eliminating clearance structure for roller cam turntable transmission is proposed. Summary of the Utility Model

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a self-eliminating clearance structure for roller cam turntable transmission to solve the problems raised in the above background art.

[0005] To achieve the above object, the utility model provides the following technical solution: A self-eliminating clearance structure for roller cam turntable transmission, including a cam and a cam drive shaft located at the bottom of the cam. Threaded grooves are formed on the outer surface of the cam. Buffer grooves are formed in the inner cavity of the threaded grooves. A threaded seal block is arranged in the middle of the threaded grooves. Limiting rods are fixedly connected to both sides of the inner cavity of the threaded seal block. A limiting top ring is arranged in the middle of the threaded seal block.

[0006] A spring is arranged at the bottom of the limiting top ring. A threaded hole is formed in the middle of the limiting top ring. Limiting grooves are formed on both sides of the limiting top ring.

[0007] A support column is inserted into the middle of the threaded seal block. One end of the support column is fixedly connected with a cam roller, and the other end is fixedly connected with a threaded column.

[0008] Preferably, the threaded grooves are arrayed on the outer surface of the cam. The diameter of the buffer grooves is smaller than that of the threaded grooves. The threaded seal block is adapted to the threaded grooves.

[0009] Preferably, the cross-sectional shape of the threaded sealing block is set as an "L" shape, and the outer surface of the threaded sealing block is threadedly connected to the inner cavity wall of the threaded groove.

[0010] Preferably, the inner cavity diameter of the threaded sealing block is the same as the inner cavity diameter of the buffer groove, and one end of the limiting rod extends into the buffer groove and fits with the wall of the buffer groove.

[0011] Preferably, both the spring and the limiting top ring are arranged in the middle of the buffer groove and the threaded sealing block, and the diameter of the limiting top ring is adapted to the inner cavity diameter of the buffer groove.

[0012] Preferably, the limiting groove is adapted to the limiting rod, and the middle part of the limiting rod is located in the middle of the limiting groove.

[0013] Preferably, the threaded column is adapted to the threaded hole, and the threaded column is located in the middle of the threaded hole and is threadedly connected to the threaded hole.

[0014] Preferably, the cam roller is set as a trapezoidal column structure, and the side wall of the cam roller close to the support column is set as an arc structure.

[0015] The technical effects and advantages of the present utility model:

[0016] 1. Firstly, the cam roller drives the limiting top ring to extrude the spring, which can adjust the distance between the cam roller and the cam, thereby adjusting the distance between the two cam rollers. And by adjusting the distance between the cam drive shaft and the cam through an external mechanism, the extrusion of the cam roller can be realized, achieving the function of automatically eliminating the transmission clearance. It can adjust the transmission precision without replacing the cam and the cam drive shaft, improving the service life.

[0017] 2. The present utility model also facilitates the limiting of the limiting top ring through the cooperation of the limiting rod and the limiting top ring, and facilitates the fixed connection of the support column and the limiting top ring through the cooperation of the threaded column and the threaded hole, facilitating combined installation and use. And through the threaded connection between the threaded sealing block and the threaded groove, it is convenient to install and disassemble the cam roller and the threaded sealing block, facilitating the maintenance and replacement of the cam roller and the spring, and improving the service life.

[0018] In summary, through the mutual influence of the above multiple functions, the function of automatically eliminating the transmission clearance can be realized without replacing the cam and the cam drive shaft, thereby realizing the adjustment of the transmission precision, improving the service life, and facilitating the maintenance and replacement of the cam roller and the second spring, improving the use effect. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0020] Figure 2This is a schematic cross-sectional structure diagram of the connection between the cam and the cam roller of the present utility model.

[0021] Figure 3 This is a schematic cross-sectional structure diagram of the cam of the present utility model.

[0022] Figure 4 This is a schematic exploded structure diagram of the cam roller, the threaded sealing block and the limiting top ring of the present utility model.

[0023] The reference numerals are: 1, cam; 2, cam transmission shaft; 3, threaded groove; 4, buffer groove; 5, threaded sealing block; 6, limiting rod; 7, limiting top ring; 8, spring; 9, limiting groove; 10, threaded hole; 11, support column; 12, threaded column; 13, cam roller. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] As shown in the attached Figures 1-4 A self-removing clearance structure for a roller cam turntable drive shown in the figure includes a cam 1 and a cam transmission shaft 2 located at the bottom of the cam 1. By rotating the cam transmission shaft 2, the buffer groove 4 can be controlled to rotate. A threaded groove 3 is provided on the outer surface of the cam 1, a buffer groove 4 is provided in the inner cavity of the threaded groove 3, a threaded sealing block 5 is provided in the middle of the threaded groove 3, limiting rods 6 are fixedly connected to both sides of the inner cavity of the threaded sealing block 5, and a limiting top ring 7 is provided in the middle of the threaded sealing block 5. The threaded sealing block 5 is conveniently installed and fixed through the threaded groove 3, and the limiting top ring 7 can be limited by the limiting rods 6;

[0026] A spring 8 is provided at the bottom of the limiting top ring 7, a threaded hole 10 is provided in the middle of the limiting top ring 7, and limiting grooves 9 are provided on both sides of the limiting top ring 7. By the pushing of the spring 8 on the limiting top ring 7, a force for the limiting top ring 7 to approach the threaded sealing block 5 is generated, and when the limiting top ring 7 is pushed, the spring 8 can be compressed for buffering;

[0027] A support column 11 is inserted in the middle of the threaded sealing block 5. One end of the support column 11 is fixedly connected with a cam roller 13, and the other end is fixedly connected with a threaded column 12. Through the cooperation of the threaded column 12 and the threaded hole 10, it is convenient to fixedly connect the cam roller 13 with the limiting top ring 7, so as to facilitate the disassembly, replacement, inspection and installation of the cam roller 13, and when the cam roller 13 is squeezed, it can drive the limiting top ring 7 to squeeze the spring 8, thereby eliminating the gap between the two cam rollers 13 during transmission, achieving the effect of eliminating the transmission gap and improving the transmission accuracy.

[0028] As shown in the Figures 1-3 attachment, the thread grooves 3 are arrayed on the outer surface of the cam 1. The diameter of the buffer groove 4 is smaller than that of the thread groove 3. The threaded sealing block 5 is adapted to the thread groove 3. By installing and fixing the threaded sealing block 5 through the thread groove 3, it is convenient to disassemble and replace the cam roller 13 and improve the service life.

[0029] As shown in the Figure 2 attachment 4 shown, the cross-sectional shape of the threaded sealing block 5 is set as an "L" shape. The outer surface of the threaded sealing block 5 is threadedly connected with the inner cavity wall of the thread groove 3. Through the threaded sealing block 5, the limiting top ring 7 can be limited, and the installation of the threaded sealing block 5 can be limited and fixed.

[0030] As shown in the Figures 2-4 attachment, the inner cavity diameter of the threaded sealing block 5 is the same as that of the buffer groove 4. One end of the limiting rod 6 extends into the buffer groove 4 and fits with the wall of the buffer groove 4, which is convenient for installing and limiting the limiting rod 6.

[0031] As shown in the Figure 2 attachment, the spring 8 and the limiting top ring 7 are both arranged in the middle of the buffer groove 4 and the threaded sealing block 5. The diameter of the limiting top ring 7 is adapted to the inner cavity diameter of the buffer groove 4. By pushing the spring 8 through the limiting top ring 7, the function of buffer adjustment can be realized.

[0032] As shown in the Figure 2 attachment 4 shown, the limiting groove 9 is adapted to the limiting rod 6. The middle part of the limiting rod 6 is located in the middle of the limiting groove 9. Through the cooperation of the limiting groove 9 and the limiting rod 6, the limiting top ring 7 is limited to prevent the limiting top ring 7 from rotating, which is convenient for fixedly connecting the limiting top ring 7 and the support column 11 for use.

[0033] As shown in the Figure 2 attachment 4As shown, the threaded column 12 is adapted to the threaded hole 10, the threaded column 12 is located in the middle of the threaded hole 10 and is threadedly connected to the threaded hole 10. Through the cooperation of the threaded column 12 and the threaded hole 10, it is convenient to fix the support column 11 with the limiting top ring 7, so that when the cam roller 13 is squeezed, the limiting top ring 7 can be driven to squeeze the spring 8, thereby reducing the distance between the two cam rollers 13, and then the effect of eliminating the transmission gap can be achieved, thereby improving the transmission accuracy.

[0034] As attached Figure 1 , 2 As shown in Figures 4, the cam roller 13 is configured as a trapezoidal column structure, and the side wall of the cam roller 13 close to the support column 11 is configured as an arc structure. The cam roller 13 can be conveniently connected to the cam drive shaft 2 for transmission, and the fitting effect between the cam roller 13 and the cam 1 can be improved, thereby improving the use effect.

[0035] Working principle of the utility model: when in use, the rotation of the cam transmission shaft 2 combined with the cam roller 13 can realize the transmission of the cam 1. When a gap is generated between the cam transmission shaft 2 and the cam roller 13, the distance between the cam transmission shaft 2 and the cam 1 can be adjusted by an external mechanism to push the cam roller 13, thereby reducing the distance between the two cam rollers 13 and achieving the effect of eliminating the transmission gap.

[0036] When the cam roller 13 is squeezed, it can drive the limiting top ring 7 to squeeze the spring 8 in turn, without affecting the transmission connection between the cam roller 13 and the cam drive shaft 2. When the cam drive shaft 2 and the cam roller 13 are misaligned, the cam roller 13 can automatically reset, thereby improving the use effect.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-clearing structure of a roller cam turntable drive, comprising a cam (1) and a cam drive shaft (2) located at the bottom of the cam (1), characterized in that: The outer surface of the cam (1) is provided with a thread groove (3), the inner cavity of the thread groove (3) is provided with a buffer groove (4), a thread sealing block (5) is provided in the middle of the thread groove (3), limiting rods (6) are fixedly connected to both sides of the inner cavity of the thread sealing block (5), and a limiting top ring (7) is provided in the middle of the thread sealing block (5); A spring (8) is provided at the bottom of the limiting top ring (7), a threaded hole (10) is provided in the middle of the limiting top ring (7), and limiting grooves (9) are provided on both sides of the limiting top ring (7); A support column (11) is inserted into the middle of the threaded sealing block (5); one end of the support column (11) is fixedly connected to a cam roller (13), and the other end is fixedly connected to a threaded column (12).

2. The self-clearing structure of the roller cam turntable transmission according to claim 1 is characterized in that: The thread grooves (3) are distributed in an array on the outer surface of the cam (1); the diameter of the buffer groove (4) is smaller than the diameter of the thread groove (3); and the thread sealing block (5) is adapted to the thread groove (3).

3. The self-clearing structure of the roller cam turntable transmission according to claim 1 is characterized in that: The cross-sectional shape of the threaded sealing block (5) is set to be an "L" shape, and the outer surface of the threaded sealing block (5) is threadedly connected to the inner cavity wall of the thread groove (3).

4. The self-clearing structure of the roller cam turntable transmission according to claim 1 is characterized in that: The inner diameter of the threaded sealing block (5) is the same as the inner diameter of the buffer groove (4), and one end of the limiting rod (6) extends into the interior of the buffer groove (4) and fits against the wall of the buffer groove (4).

5. The self-clearing structure of the roller cam turntable transmission according to claim 1 is characterized in that: The spring (8) and the limiting top ring (7) are both arranged in the middle of the buffer groove (4) and the threaded sealing block (5), and the diameter of the limiting top ring (7) is compatible with the inner cavity diameter of the buffer groove (4).

6. The self-clearing structure of the roller cam turntable transmission according to claim 1 is characterized in that: The limiting groove (9) is matched with the limiting rod (6), and the middle part of the limiting rod (6) is located in the middle part of the limiting groove (9).

7. The self-clearing structure of the roller cam turntable transmission according to claim 1 is characterized in that: The threaded column (12) is adapted to the threaded hole (10); the threaded column (12) is located in the middle of the threaded hole (10) and is threadedly connected to the threaded hole (10).

8. The self-clearing structure of the roller cam turntable transmission according to claim 1 is characterized in that: The cam roller (13) is configured as a trapezoidal column structure, and a side wall of the cam roller (13) close to the support column (11) is configured as an arc structure.

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