A double-acting cylinder clamping and rotating device for a cold rolling tube mill

Abstract

The present invention relates to a double-acting cylinder clamping and rotating device for a cold rolling tube mill, which comprises a rotating box body. A hollow rotating shaft is arranged inside the rotating box body. A sealing sleeve seat is arranged on the rear side of the rotating box body. A rotating disc is arranged inside the sealing sleeve seat. The rotating disc is fixedly connected to the rear end of the hollow rotating shaft. A first annular groove and a second annular groove are formed on the outer side wall of the rotating disc. A first air port leading to the first annular groove and a second air port leading to the second annular groove are formed on the side wall of the sealing sleeve seat. A plurality of first air channels leading out from the first annular groove to the rear side of the rotating disc are formed inside the rotating disc. A plurality of second air channels leading out from the second annular groove to the rear side of the rotating disc are also formed inside the rotating disc. A cylinder assembly is installed in the installation port on the inner side of the rotating disc. A clamping member is arranged on the cylinder assembly. The cylinder assembly has a first air vent and a second air vent. A first air pipe is connected between the first air vent and the first air channel. A second air pipe is connected between the second air vent and the second air channel. The present invention provides a brand-new clamping structure, which effectively prevents the clamping member from being worn.

Description

Technical Field

[0001] The present invention relates to the technical field of cold rolling tube mills, and in particular to a double-acting cylinder clamping and rotating device for a cold rolling tube mill. Background Art

[0002] In a cold rolling tube mill, the clamping and rotating device is mainly used to clamp the mandrel and drive it to rotate intermittently.

[0003] In the clamping and rotating device of the existing cold rolling tube mill, the clamping mechanism thereon realizes the movement of the clamping member towards the mandrel by driving the sliding sleeve. The displacement of the sliding sleeve drives the clamping block to move frictionally on the inclined inner wall of the sliding sleeve, so that the clamping block clamps on the mandrel. This structure will inevitably cause wear on the contact surface between the sliding sleeve and the clamping block.

[0004] For example, in a mandrel rod clamping device of a two-roll cold rolling tube mill with the application number CN201320339046.7, an oil cylinder drives a fork to drive the sliding sleeve to move horizontally. The mandrel rod claw (equivalent to the clamping block) is fixedly installed in the sliding groove of the sliding sleeve. There is a certain angle between the sliding groove and the center line of the sliding sleeve. The mandrel rod claw cannot move horizontally and can only move downward along the inclined plane to clamp the mandrel rod. It can be seen that to drive the mandrel rod claw to clamp, the sliding sleeve needs to press on the mandrel rod claw to move. During this process, the contact surface between the sliding sleeve and the mandrel rod claw will inevitably rub under a certain pressure state. Therefore, after using for a long time, the contact surface between the sliding sleeve and the mandrel rod claw will be worn. After the wear, the sliding sleeve needs to move a longer distance to completely clamp the mandrel rod by the mandrel rod claw. Since the clamping force is set in advance and will not change according to the wear amount, the worn mandrel rod claw cannot completely clamp the mandrel under the action of the sliding sleeve.

[0005] Another example is a double-oil-cylinder clamping device for a cold rolling tube mill with the application number CN202121642397.6. Its oil cylinder pushes the movable sleeve to move, and the pressure sleeve (equivalent to the sliding sleeve) presses the clamping plates on both sides (equivalent to the clamping members) to clamp the mandrel; this existing technology also needs the pressure sleeve to press the clamping plates under a certain pressure state to perform the clamping work. Therefore, the contact surface between the pressure sleeve and the clamping plates will also inevitably cause a certain degree of wear. Summary of the Invention

[0006] The present invention provides a double-acting cylinder clamping and rotating device for a cold rolling tube mill, which provides a brand-new clamping structure and will not cause pressure wear of the clamping member during the clamping process, and solves the above problems existing in the prior art during use.

[0007] The technical solution of the present invention is realized as follows: A double-acting cylinder clamping and rotating device for a cold rolling tube mill, comprising a rotating box body, wherein a hollow rotating shaft is rotatably connected inside the rotating box body, and the front and rear ends of the hollow rotating shaft respectively penetrate through the front and rear sides of the rotating box body. A rotating drive mechanism for driving the hollow rotating shaft to rotate is provided inside the rotating box body. A sealing sleeve seat is fixedly connected to the rear side of the rotating box body. An annular turntable is rotatably fitted inside the sealing sleeve seat. The turntable is fixedly connected to the rear end of the hollow rotating shaft. A first annular groove and a second annular groove are formed on the outer side wall of the turntable. A first air port leading to the first annular groove and a second air port leading to the second annular groove are formed on the side wall of the sealing sleeve seat. A plurality of first air passages leading out of the rear side of the turntable from the first annular groove are formed inside the turntable. A plurality of second air passages leading out of the rear side of the turntable from the second annular groove are also formed inside the turntable. At least two mounting ports are circumferentially formed on the inner side of the turntable. A cylinder assembly is installed in the mounting ports. A clamping member is provided on the cylinder assembly. The cylinder assembly has a first air vent and a second air vent. A first air pipe is connected between the first air vent and the first air passage. A second air pipe is connected between the second air vent and the second air passage.

[0008] Preferably, the cylinder assembly includes a cylinder body, a telescopic rod and a piston. The cylinder body is fixedly installed in the mounting port. A piston cavity is formed inside the cylinder body. The piston is movably arranged in the piston cavity. One end of the telescopic rod is fixedly connected to the piston. The other end of the telescopic rod penetrates through the cylinder body towards the center position of the turntable and is fixedly connected to the clamping member. The first air vent leads to the piston cavity far from the telescopic rod end. The second air vent leads to the piston cavity near the telescopic rod end.

[0009] Preferably, the number of the first air passages is the same as that of the first air vents, and they are correspondingly connected in pairs through the first air pipes. The number of the second air passages is the same as that of the second air vents, and they are correspondingly connected in pairs through the second air pipes.

[0010] Preferably, a brake disc is slidably arranged inside the sealing sleeve seat. The brake disc is located between the rotating box body and the turntable. The brake disc is sleeved outside the hollow rotating shaft. An air cavity is provided between the brake disc and the turntable. A third air passage leading from the second air passage to the air cavity is provided inside the turntable. A brake convex block is integrally formed on the outer side wall of the hollow rotating shaft on the front side of the brake disc. A reset mechanism is provided between the brake disc and the rotating box body.

[0011] Preferably, a plurality of axial limiting grooves are formed on the inner side wall of the sealing sleeve seat. A limiting strip slidably fitted in the limiting grooves is connected to the brake disc.

[0012] Preferably, the braking bump includes a first inclined surface, a second inclined surface is formed on the braking disc, and a brake pad is adhered to the second inclined surface.

[0013] Preferably, the reset mechanism includes a spring. A spring seat is provided on the rotary box body. One end of the spring is fixedly connected inside the spring seat, and the other end of the spring abuts against the braking disc.

[0014] Preferably, a first sealing ring located between the first annular groove and the second annular groove, a second sealing ring located on the front side of the first annular groove, and a third sealing ring located on the rear side of the second annular groove are provided on the inner side wall of the rotary box body. The first sealing ring, the second sealing ring, and the third sealing ring all abut against the outer side wall of the turntable.

[0015] Preferably, a clamping wheel is further provided on the clamping member, and an arc groove is recessed on the circumferential outer side wall of the clamping wheel.

[0016] Preferably, the rotary driving mechanism includes an input shaft, a driving gear, a driven gear, and a hydraulic motor. The driven gear is fixedly connected to the hollow rotary shaft, the driving gear is fixedly connected to the input shaft, the input shaft is rotatably connected to the rotary box body, the hydraulic motor is fixedly installed on the rotary box body, and the hydraulic motor is connected to the input shaft.

[0017] In summary, the beneficial effects of the present invention are as follows:

[0018] 1. The present invention provides a brand-new clamping mechanism. During the clamping process, compressed air is introduced from the first air port. The compressed air enters the first annular groove, then enters the first air passage and then enters the first air pipe, and then reaches the cylinder assembly through the first air vent, enabling the cylinder assembly to control the clamping member to clamp the mandrel. After the mandrel is clamped, the rotary driving mechanism drives the hollow rotary shaft to rotate, and the hollow rotary shaft drives the turntable to rotate. During the rotation of the turntable, the positions of the first annular groove and the second annular groove always correspond to the first air port and the second air port. Therefore, the cylinder assembly can also stably and reliably clamp the mandrel and rotate it. This clamping structure is completely different from the clamping mechanisms in the prior art, directly solving the problem of wear of the clamping member caused by the cooperation with the sliding sleeve in the prior art. When the clamping member needs to release the mandrel, compressed air enters the second annular groove from the second air port, then enters the second air passage and is introduced into the second air pipe, and then reaches the cylinder assembly through the second air vent, enabling the cylinder assembly to control the clamping member to release the mandrel, and at this time, the first air port exhausts.

[0019] 2. When the clamping member releases the mandrel, the brake disc can brake the hollow rotary shaft to completely stop its rotation. Generally, before the clamping member releases the mandrel, the rotary drive mechanism will stop rotating the hollow rotary shaft. However, due to inertia, the hollow rotary shaft will still rotate. Therefore, it is impossible to immediately release the mandrel when the rotary drive mechanism stops working to prevent accidents. Through the setting of the brake disc, when compressed air enters the second annular groove from the second air port and then enters the second air duct, a part of the compressed air will enter the third air duct to reach the air cavity, and then push the brake disc to move towards the brake bump on the hollow rotary shaft, pushing the brake disc to press against the brake bump, so that the hollow rotary shaft stops rotating due to inertia. Therefore, it means that after the compressed air enters the second annular groove from the second air port, while the cylinder assembly controls the clamping member to release the mandrel, the brake disc will also stop the rotation of the hollow rotary shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a rear view of the present invention;

[0023] Figure 3 is Figure 2 a schematic cross-sectional structure diagram in the A-A direction;

[0024] Figure 4 is Figure 3 a partial enlarged schematic diagram at A in;

[0025] Figure 5 is a schematic diagram of the structure of the turntable exploded in the present invention;

[0026] Figure 6 is a schematic diagram of the structure of the present invention after removing the first air pipe and the second air pipe;

[0027] Figure 7 is a schematic diagram of the structure of the turntable, the cylinder assembly, the clamping member, the first air pipe and the second air pipe in the present invention;

[0028] Figure 8 is a rear view of the turntable in the present invention;

[0029] Figure 9 isFigure 8 Schematic diagram of the sectional structure in the B-B direction;

[0030] Figure 10 is Figure 8 Schematic diagram of the sectional structure in the C-C direction.

[0031] In the figure: 1, rotary box body; 2, hollow rotary shaft; 3, seal sleeve seat; 4, turntable; 5, first annular groove; 6, second annular groove; 7, first air port; 8, second air port; 9, first air duct; 10, second air duct; 11, mounting port; 12, clamping member; 13, first ventilation port; 14, second ventilation port; 15, first air pipe; 16, second air pipe; 17, cylinder block; 18, telescopic rod; 19, piston; 20, piston cavity; 21, brake disc; 22, air cavity; 23, third air duct; 24, brake convex block; 25, limiting groove; 26, limiting strip; 27, first inclined surface; 28, second inclined surface; 29, brake shoe; 30, spring; 31, spring seat; 32, first sealing ring; 33, second sealing ring; 34, third sealing ring; 35, clamping wheel; 36, arc groove; 37, input shaft; 38, driving gear; 39, driven gear; 40, hydraulic motor. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying Figures 1-10 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.

[0033] Embodiment:

[0034] As Figures 1 to 10As shown in the figure, the present invention discloses a double-acting cylinder clamping and rotating device for a cold rolling tube mill, which includes a rotating box body 1. A hollow rotating shaft 2 is rotatably connected inside the rotating box body 1. The front and rear ends of the hollow rotating shaft 2 respectively penetrate through the front and rear sides of the rotating box body 1. A rotating drive mechanism for driving the hollow rotating shaft 2 to rotate is provided inside the rotating box body 1. In addition, a sealing sleeve seat 3 is fixedly connected to the rear side of the rotating box body 1. An annular turntable 4 is rotatably fitted inside the sealing sleeve seat 3. The turntable 4 is fixedly connected to the rear end of the hollow rotating shaft 2 by a screw. A first annular groove 5 and a second annular groove 6 are formed on the outer side wall of the turntable 4. A first air port 7 leading to the first annular groove 5 and a second air port 8 leading to the second annular groove 6 are formed on the side wall of the sealing sleeve seat 3. Three first air passages 9 leading from the first annular groove 5 to the rear side of the turntable 4 are formed inside the turntable 4. And three second air passages 10 leading from the second annular groove 6 to the rear side of the turntable 4 are also formed inside the turntable 4. In addition, three mounting openings 11 are circumferentially formed on the inner side of the turntable 4. Cylinder assemblies are installed in the mounting openings 11. Clamping members 12 are provided on the cylinder assemblies. The cylinder assemblies have a first air vent 13 and a second air vent 14. The first air vents 13 and the first air passages 9 are pairwise corresponding and are connected through first air pipes 15. The second air vents 14 and the second air passages 10 are pairwise corresponding and are connected through second air pipes 16.

[0035] Specifically, as Figures 2 to 4 shown, the cylinder assembly includes a cylinder body 17, a telescopic rod 18 and a piston 19. The cylinder body 17 is fixedly installed in the mounting opening 11. A piston cavity 20 is formed inside the cylinder body 17. Among them, the piston 19 is movably arranged in the piston cavity 20. One end of the telescopic rod 18 is fixedly connected to the piston 19. The other end of the telescopic rod 18 penetrates through the cylinder body 17 towards the center position of the turntable 4 and is fixedly connected to the clamping member 12. The above-mentioned first air vent 13 leads to the piston cavity 20 at the end far from the telescopic rod 18, and the second air vent 14 leads to the piston cavity 20 at the end close to the telescopic rod 18.

[0036] When it is necessary to clamp the mandrel, compressed air is introduced through the first air port 7. The compressed air enters the first annular groove 5, then enters the first air passage 9 and then into the first air pipe 15, and then reaches the piston chamber 20 in the cylinder block 17 through the first air vent 13, pushing the piston 19 so that the telescopic rod 18 drives the clamping member 12 to move towards the center position of the turntable 4, thereby clamping the mandrel. The gas in the piston chamber 20 near one end of the telescopic rod 18 passes through the second air pipe 16, enters the second air passage 10 to reach the second annular groove 6, and is discharged through the second air port 8. After the mandrel is clamped, the rotary drive mechanism drives the hollow rotary shaft 2 to rotate, and the hollow rotary shaft 2 drives the turntable 4 to rotate. During the rotation of the turntable 4, the positions of the first annular groove 5 and the second annular groove 6 always correspond to the first air port 7 and the second air port 8. Therefore, the cylinder assembly can also clamp the mandrel stably and reliably for rotation. This clamping structure is completely different from the clamping mechanism in the prior art, directly solving the wear problem of the clamping member 12 caused by the cooperation with the sliding sleeve in the prior art. When it is necessary to loosen the mandrel by the clamping member 12, compressed air enters the second annular groove 6 through the second air port 8, then enters the second air passage 10 and is introduced into the second air pipe 16, and then reaches the piston chamber 20 near one end of the telescopic rod 18 through the second air vent 14, thereby pushing the piston 19 so that the telescopic rod 18 drives the clamping member 12 to loosen the mandrel, and the gas in the piston chamber 20 far from one end of the telescopic rod 18 passes through the first air pipe 15, enters the first air passage 9 to reach the first annular groove 5, and is discharged through the first air port 7.

[0037] In the present invention, a brake disc 21 is slidably arranged inside the sealing sleeve seat 3. The brake disc 21 is located between the rotary box body 1 and the turntable 4, and the brake disc 21 is sleeved outside the hollow rotary shaft 2. An air chamber 22 is provided between the brake disc 21 and the turntable 4. A third air passage 23 leading from the second air passage 10 to the air chamber 22 is provided inside the turntable 4. A brake projection 24 is integrally formed on the outer side wall of the hollow rotary shaft 2 and is located on the front side of the brake disc 21. In addition, a reset mechanism is provided between the brake disc 21 and the rotary box body 1.

[0038] The specific structure in which the brake disc 21 is slidably arranged inside the sealing sleeve seat 3 and does not rotate relative to the sealing sleeve seat 3 is as follows: A plurality of axial limiting grooves 25 are formed on the inner side wall of the sealing sleeve seat 3, and a limiting strip 26 that is slidably engaged in the limiting grooves 25 is connected to the brake disc 21.

[0039] Specifically, the brake projection 24 includes a first inclined surface 27, and a second inclined surface 28 is formed on the brake disc 21. A brake lining 29 is adhered to the second inclined surface 28. This structure facilitates the effective braking of the hollow rotary shaft 2 when the brake lining 29 on the brake disc 21 abuts against the first inclined surface 27.

[0040] Specifically, the reset mechanism includes a spring 30. A spring seat 31 is provided on the rotary box body 1. One end of the spring 30 is fixedly connected inside the spring seat 31, and the other end of the spring 30 abuts against the brake disc 21. When the compressed air in the air chamber 22 is discharged, the spring 30 can quickly push the brake disc 21 to reset.

[0041] The brake disc 21 can brake the hollow rotary shaft 2 when the clamping member 12 releases the mandrel, so that the hollow rotary shaft 2 completely stops rotating. Generally, before the clamping member 12 releases the mandrel, the rotary drive mechanism will stop rotating the hollow rotary shaft 2. However, the hollow rotary shaft 2 will still rotate under the action of inertia. Therefore, it is impossible to immediately release the mandrel when the rotary drive mechanism stops working to prevent accidents. Through the setting of the brake disc 21, when the compressed air enters the second annular groove 6 from the second air port 8 and then enters the second air passage 10, a part of the compressed air will enter the third air passage 23 and reach the air chamber 22, and then push the brake disc 21 to move towards the brake projection 24 on the hollow rotary shaft 2, and push the brake disc 21 to press against the brake projection 24, so that the hollow rotary shaft 2 stops rotating due to inertia. Therefore, it means that after the compressed air enters the second annular groove 6 from the second air port 8, when the cylinder assembly controls the clamping member 12 to release the mandrel, the brake disc 21 will also stop the hollow rotary shaft 2 from rotating.

[0042] To improve the sealing performance of the present invention, a first sealing ring 32 located between the first annular groove 5 and the second annular groove 6, a second sealing ring 33 located on the front side of the first annular groove 5, and a third sealing ring 34 located on the rear side of the second annular groove 6 are provided on the inner side wall of the rotary box body 1. The above-mentioned first sealing ring 32, second sealing ring 33, and third sealing ring 34 all abut against the outer side wall of the turntable 4.

[0043] Specifically, a clamping wheel 35 is further provided on the clamping member 12. An arc-shaped groove 36 is recessed on the circumferential outer side wall of the clamping wheel 35. The arc-shaped grooves 36 of multiple clamping wheels 35 form a state close to a circle, so that it can more effectively fit on the outer surface of the mandrel to clamp it.

[0044] More specifically, the rotary drive mechanism includes an input shaft 37, a driving gear 38, a driven gear 39, and a hydraulic motor 40. The driven gear 39 is fixedly connected to the hollow rotary shaft 2, the driving gear 38 is fixedly connected to the input shaft 37, the input shaft 37 is rotatably connected to the rotary box body 1, the hydraulic motor 40 is fixedly installed on the rotary box body 1, and the hydraulic motor 40 is connected to the input shaft 37. The hydraulic motor 40 can drive the input shaft 37 to rotate, so that the driven gear 39 drives the driving gear 38 to rotate, so that the hollow rotary shaft 2 rotates, and the hollow rotary shaft 2 drives the turntable 4 to rotate, so that the clamping member 12 clamps the mandrel to rotate.

[0045] It should be noted that the terms pointed out by the present invention, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This 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. Therefore, it should not be construed as a limitation to the protection scope of the present invention.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-acting cylinder clamping and rotating device for a cold rolling tube mill, comprising a rotating box body, wherein a hollow rotating shaft is rotatably connected inside the rotating box body, the front and rear ends of the hollow rotating shaft respectively penetrate through the front and rear sides of the rotating box body, a rotating drive mechanism for driving the hollow rotating shaft to rotate is arranged inside the rotating box body, and a sealing sleeve seat is fixedly connected to the rear side of the rotating box body, characterized in that: A ring-shaped turntable is rotatably fitted inside the sealing sleeve seat. The turntable is fixedly connected to the rear end of the hollow rotary shaft. A first annular groove and a second annular groove are formed on the outer side wall of the turntable. A first air port leading to the first annular groove and a second air port leading to the second annular groove are formed on the side wall of the sealing sleeve seat. A plurality of first air channels leading out from the first annular groove to the rear side of the turntable are formed inside the turntable. A plurality of second air channels leading out from the second annular groove to the rear side of the turntable are also formed inside the turntable. At least two mounting ports are circumferentially formed on the inner side of the turntable. A cylinder assembly is installed in the mounting port. A clamping member is provided on the cylinder assembly. The cylinder assembly has a first air vent and a second air vent. A first air tube is connected between the first air vent and the first air channel. A second air tube is connected between the second air vent and the second air channel. The cylinder assembly includes a cylinder body, a telescopic rod, and a piston. The cylinder body is fixedly installed in the mounting port. A piston cavity is formed inside the cylinder body. The piston is movably arranged in the piston cavity. One end of the telescopic rod is fixedly connected to the piston. The other end of the telescopic rod penetrates through the cylinder body towards the center position of the turntable and is fixedly connected to the clamping member. The first air vent leads to the piston cavity far from the end of the telescopic rod. The second air vent leads to the piston cavity near the end of the telescopic rod. The number of the first air channels is the same as the number of the first air vents, and they are correspondingly connected in pairs through the first air tubes. The number of the second air channels is the same as the number of the second air vents, and they are correspondingly connected in pairs through the second air tubes. A brake disc is slidably arranged inside the sealing sleeve seat. The brake disc is located between the rotary box body and the turntable. The brake disc is sleeved outside the hollow rotary shaft. An air cavity is provided between the brake disc and the turntable. A third air channel leading from the second air channel to the air cavity is formed inside the turntable. A brake projection integrally formed on the outer side wall of the hollow rotary shaft is located on the front side of the brake disc. A reset mechanism is arranged between the brake disc and the rotary box body. The brake projection includes a first inclined surface. A second inclined surface is formed on the brake disc. A brake lining is adhered to the second inclined surface.

2. The double-acting cylinder clamping and slewing device of a cold rolling tube mill according to claim 1, characterized in that: A plurality of axial limiting grooves are formed on the inner side wall of the sealing sleeve seat. A limiting strip slidably fitted in the limiting grooves is connected to the brake disc.

3. A double-acting cylinder clamping and rotating device for a cold rolling tube mill according to claim 1, characterized in that: The reset mechanism includes a spring. A spring seat is provided on the rotary box body. One end of the spring is fixedly connected inside the spring seat. The other end of the spring abuts against the brake disc.

4. A double-acting cylinder clamping and rotating device for a cold rolling tube mill according to claim 1, characterized in that: A first sealing ring located between the first annular groove and the second annular groove, a second sealing ring located on the front side of the first annular groove, and a third sealing ring located on the rear side of the second annular groove are provided on the inner side wall of the rotary box body. The first sealing ring, the second sealing ring, and the third sealing ring all abut against the outer side wall of the turntable.

5. A double-acting cylinder clamping and rotating device for a cold rolling tube mill according to claim 1, characterized in that: A clamping wheel is further provided on the clamping member. An arc-shaped groove is recessed on the circumferential outer side wall of the clamping wheel.

6. The double-acting cylinder clamping and rotating device of a cold rolling tube mill according to claim 1, characterized in that: The slewing drive mechanism includes an input shaft, a driving gear, a driven gear and a hydraulic motor. The driven gear is fixedly connected to a hollow slewing shaft. The driving gear is fixedly connected to the input shaft. The input shaft is rotatably connected to a slewing housing. The hydraulic motor is fixedly installed on the slewing housing and is connected to the input shaft.

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