Swing hydraulic cylinder with auxiliary rotary supporting device

Abstract

The utility model provides a swing hydraulic cylinder with an auxiliary rotary supporting device, which is provided with an outer shell, a main shaft is arranged in the outer shell, a containing cavity is arranged between the axial outer side end of a sealing supporting sleeve on the left side of the main shaft and the main shaft, and the auxiliary rotary supporting device is fixedly arranged in the containing cavity. The sealing supporting sleeve and the main shaft are rotationally supported through an auxiliary rotating supporting device, a containing cavity is formed between the axial outer side end of the sealing supporting sleeve on the right side of the main shaft and the axial inner side end of the rotating supporting sleeve, and the auxiliary rotating supporting device is fixedly arranged in the containing cavity. The sealing supporting sleeve and the rotary supporting sleeve are rotationally supported through an auxiliary rotary supporting device. The lubricating effect between the main shaft and the sealing supporting sleeve and between the rotating supporting sleeve and the sealing supporting sleeve can be improved, friction force is reduced, and the technical problem that the temperature of the main shaft and the temperature of the sealing supporting sleeve are too high due to long-time high-strength operation of the swing cylinder is solved. The swing hydraulic cylinder can be widely applied to swing hydraulic cylinders.

Description

Technical Field

[0001] The utility model relates to a swing hydraulic cylinder, in particular to a swing hydraulic cylinder with an auxiliary rotary support device. Background Technique

[0002] A swing hydraulic cylinder is a device that uses a hydraulic system to achieve rotary motion, and has the characteristics of compact structure, large output torque, high reliability, etc.

[0003] Since the swing hydraulic cylinder often needs to work intensively for a long time in a relatively closed environment, the long-term rotary friction between the rotary components causes the temperature inside the cylinder to rise. The continuous increase in the temperature inside the cylinder will directly reduce the sealing performance of the swing cylinder. To solve this problem, the existing swing cylinders are provided with lubricating gaskets between the rotary components to avoid direct friction between the rotary components. However, during operation, it is found that the lubricating and cooling effect of the lubricating gasket is obvious during the short-term operation of the swing cylinder, while during the long-term intensive operation, the swing cylinder will still generate obvious temperature rise. Especially for the two components of the main shaft and the seal support sleeve, the temperature rise is particularly prominent, directly affecting the sealing performance between the seal support sleeve and the outer housing and the main shaft. Content of the Utility Model

[0004] The utility model aims at the above technical problems and provides a swing hydraulic cylinder with an auxiliary rotary support device. The swing hydraulic cylinder with an auxiliary rotary support device can increase the lubricating effect between the main shaft and the seal support sleeve and between the rotary support sleeve and the seal support sleeve, reduce the friction force, and can avoid the problem that the temperatures of the two components of the main shaft and the seal support sleeve are too high due to the long-term intensive operation of the swing cylinder, and ensure the sealing effect between the seal support sleeve and the outer housing and the main shaft.

[0005] For this reason, the technical solution of the utility model is a swing hydraulic cylinder with an auxiliary rotary support device, which is provided with an outer housing. Inside the outer housing, there is a main shaft. The outermost circumferential surface of the leftmost side of the main shaft is a stepped shaft structure. The outermost shaft surface of the stepped shaft structure of the main shaft is rotationally and sealingly connected to the innermost circumferential surface of the leftmost side of the outer housing. Between the outermost circumferential surface of the rightmost side of the main shaft and the innermost circumferential surface of the rightmost end of the outer housing, there is a rotary support sleeve. The rotary support sleeve is a stepped shaft structure. The inner circumferential surface of the rotary support sleeve is fixedly connected to the outermost circumferential surface of the rightmost side of the main shaft. The outermost shaft surface of the rotary support sleeve is rotationally and sealingly connected to the innermost circumferential surface of the rightmost side of the outer housing;

[0006] Between the innermost shaft surface of the stepped shaft structure of the main shaft and the inner circumferential surface of the outer housing and at the adjacent position inside the rotary support sleeve where the outer circumferential surface of the right side of the main shaft is located, there are seal support sleeves. The inner circumferential surfaces of the two seal support sleeves are rotationally and sealingly connected to the corresponding outer circumferential positions of the main shaft respectively. The outer circumferential surfaces of the two seal support sleeves are sealingly and fixedly connected to the corresponding inner circumferential positions of the outer housing respectively;

[0007] An accommodation cavity is provided between the outer axial end of the sealing support sleeve on the left side of the main shaft and the main shaft. An auxiliary rotary support device is fixedly arranged in the accommodation cavity, and the sealing support sleeve and the main shaft are rotationally supported by the auxiliary rotary support device;

[0008] An accommodation cavity is provided between the outer axial end of the sealing support sleeve on the right side of the main shaft and the inner axial end of the rotary support sleeve. An auxiliary rotary support device is fixedly arranged in the accommodation cavity, and the sealing support sleeve and the rotary support sleeve are rotationally supported by the auxiliary rotary support device;

[0009] An oil cavity is provided among the outer housing, the main shaft and the two sealing support sleeves;

[0010] An internal gear ring and a rotary piston are sequentially arranged from outside to inside between the middle position of the outer circumference of the main shaft and the middle position of the inner circumference of the outer housing. The inner circumference of the internal gear ring meshes with the outer circumference of one side of the rotary piston, and the inner circumference of the same side of the rotary piston is rotationally and sealingly connected to the outer circumference of the main shaft;

[0011] The outer circumference of the other side of the rotary piston is rotationally and sealingly connected to the inner circumference of the outer housing, and the inner circumference of the same side of the rotary piston meshes with the outer circumference of the main shaft.

[0012] Preferably, the auxiliary rotary support device is a thrust bearing. An installation hole is provided at the middle position of the thrust bearing, and the thrust bearing is fixed at the outer circumference position of the main shaft through the installation hole;

[0013] The thrust bearing includes an inner ring and an outer ring. The outer end of the inner ring is fixedly connected to the main shaft, and the outer end of the outer ring is fixedly connected to the sealing support sleeve;

[0014] A cage is provided between the inner ring and the outer ring. A plurality of through holes are provided on the cage along the circumferential direction, and a plurality of rolling elements are respectively arranged in the plurality of through holes. The plurality of rolling elements support the inner ring and the outer ring on both sides to realize relative rotation.

[0015] Preferably, the thickness of the thrust bearing is 10mm ± 2mm;

[0016] The thicknesses of the inner ring and the outer ring are respectively 2.5mm ± 0.5mm.

[0017] Preferably, a groove is provided on the outermost shaft surface of the leftmost stepped shaft structure of the main shaft, and a dust-proof sealing ring is provided in the groove. The outermost shaft surface of the leftmost stepped shaft structure of the main shaft is rotationally and sealingly connected to the leftmost inner circumference of the outer housing through the dust-proof sealing ring;

[0018] A groove is provided on the outermost shaft surface of the rotary support sleeve, and a dust-proof sealing ring is provided in the groove. The outermost shaft surface of the rotary support sleeve is rotationally and sealingly connected to the rightmost inner circumference of the outer housing through the dust-proof sealing ring.

[0019] Preferably, a wear-resistant support pad is provided between the outer second shaft surface of the leftmost stepped shaft structure of the main shaft and the corresponding position on the inner circumference of the outer housing, and the outer second shaft surface of the leftmost stepped shaft structure of the main shaft and the inner circumference of the outer housing are rotationally supported and connected through the wear-resistant support pad;

[0020] A wear-resistant support pad is provided between the outer second shaft surface of the rotary support sleeve and the corresponding position on the inner circumference of the outer housing, and the outer second shaft surface of the rotary support sleeve and the inner circumference of the outer housing are rotationally supported and connected through the wear-resistant support pad.

[0021] Preferably, grooves are respectively provided on the outer circumferences of the seal support sleeves on the left and right sides of the main shaft, and oil seals are respectively provided in the grooves. The outer circumferences of the two seal support sleeves and the corresponding positions on the inner circumferences of the left and right sides of the outer housing are hermetically and fixedly connected through the oil seals;

[0022] Grooves are respectively provided on the inner circumferences of the seal support sleeves on the left and right sides of the main shaft, and oil seals are provided in the grooves. The inner circumferences of the two seal support sleeves and the corresponding positions on the outer circumferences of the left and right sides of the main shaft are rotationally sealed and connected through the oil seals.

[0023] Preferably, the rotary piston includes a left end portion of the rotary piston and a right end portion of the rotary piston. A groove is provided on the outer circumference of the left end portion of the rotary piston, and an oil seal is provided in the groove. The outer circumference of the left end portion of the rotary piston and the inner circumference of the outer housing are rotationally sealed through the oil seal;

[0024] A groove is provided at a position near the right side on the inner circumference of the right end portion of the rotary piston, and an oil seal is provided in the groove. The inner circumference of the right end portion of the rotary piston and the outer circumference of the main shaft are rotationally sealed through the oil seal;

[0025] The left end portion of the rotary piston divides the oil chamber into a left oil chamber and a right oil chamber, and the left oil chamber and the right oil chamber are respectively communicated with the left oil hole and the right oil hole on the outer housing.

[0026] The beneficial effect of the present utility model is that by using thrust bearings for axial rotational support between the main shaft and the seal support sleeve in the swing cylinder axially, and between the rotary support sleeve and the seal support sleeve axially, compared with the previous support wear-resistant pads, it has obvious advantages. First, since the thrust bearing uses rolling friction while the support wear-resistant pad uses mechanical sliding friction, when using the thrust bearing for rotation, the friction between the main shaft and the seal support sleeve and between the rotary support sleeve and the seal support sleeve during rotation is significantly reduced, thereby directly reducing the noise during the operation of the swing cylinder. And, since the friction between the main shaft and the seal support sleeve and between the rotary support sleeve and the seal support sleeve during rotation is reduced, the rotation smoothness of the main shaft and the stability of the main shaft rotation are also significantly improved;

[0027] More importantly, when the swing cylinder operates under high load for a long time, the overall temperature of the swing cylinder will not increase significantly, thus ensuring that the oil seals inside the cylinder have a lasting and stable sealing performance, and extending the overall service life of the swing cylinder. Description of the Drawings

[0028] Figure 1 is a perspective view of the present utility model;

[0029] Figure 2 is a front view of the present utility model;

[0030] Figure 3 is the present utility model Figure 2 sectional view taken along line A-A in the present utility model;

[0031] Figure 4 is an exploded view of the auxiliary rotary support device in the present utility model;

[0032] Figure 5 is the present utility model Figure 3 enlarged view at position B in the present utility model.

[0033] Explanation of the Symbols in the Drawings:

[0034] 1. Outer housing; 2. Main shaft; 3. Sealing support sleeve; 4. Auxiliary rotary support device; 401. Axial ring; 402. Cage; 403. Race ring; 404. Rolling element; 405. Mounting hole; 5. Rotary support sleeve; 6. Internal gear ring; 7. Rotary piston; 701. Left end part of the rotary piston; 702. Right end part of the rotary piston; 8. Oil chamber; 801. Left oil chamber; 802. Right oil chamber; 9. Dust-proof sealing ring; 10. Wear-resistant support pad; 11. Oil seal ring; 12. Fixed support base. Detailed Embodiment

[0035] The following further describes the present utility model in conjunction with embodiments.

[0036] Through Figures 1-5 It can be seen that for the swing hydraulic cylinder with an auxiliary rotary support device, there is an outer housing 1 provided inside the outer housing 1, a main shaft 2 is provided inside the main shaft 2, the outermost circumferential surface of the leftmost part of the main shaft 2 is a stepped shaft structure, the outermost shaft surface of the stepped shaft structure of the main shaft 2 is rotationally and sealingly connected to the leftmost inner circumference of the outer housing 1, a rotary support sleeve 5 is provided between the outermost circumferential surface of the rightmost part of the main shaft 2 and the rightmost inner circumference of the outer housing 1, the rotary support sleeve 5 is a stepped shaft structure, the inner circumference of the rotary support sleeve 5 is fixedly connected to the outermost circumferential surface of the rightmost part of the main shaft 2, and the outermost shaft surface of the rotary support sleeve 5 is rotationally and sealingly connected to the rightmost inner circumference of the outer housing 1.

[0037] A sealing support sleeve 3 is provided between the innermost shaft surface of the stepped shaft structure of the main shaft 2 and the inner circumference of the housing 1, and at the adjacent position inside the rotary support sleeve 5 where the outer circumference on the right side of the main shaft 2 is located. The inner circumferences of the two sealing support sleeves 3 are respectively rotationally and sealingly connected to the corresponding outer circumference positions of the main shaft 2, which can prevent the oil in the cylinder from leaking out along the gap here when the main shaft 2 rotates.

[0038] The outer circumferences of the two sealing support sleeves 3 are respectively sealingly and fixedly connected to the corresponding inner circumference positions of the housing 1, which can prevent the oil in the cylinder from leaking out along the gap here.

[0039] There is a receiving cavity between the axially outer end of the sealing support sleeve 3 on the left side of the main shaft 2 and the main shaft 2. An auxiliary rotary support device 4 is fixedly arranged in the receiving cavity. The sealing support sleeve 3 and the main shaft 2 are rotationally supported by the auxiliary rotary support device 4. There is a receiving cavity between the axially outer end of the sealing support sleeve 3 on the right side of the main shaft 2 and the axially inner end of the rotary support sleeve 5. An auxiliary rotary support device 4 is fixedly arranged in the receiving cavity. The sealing support sleeve 3 and the rotary support sleeve 5 are rotationally supported by the auxiliary rotary support device 4. More importantly, the auxiliary rotary support device 4 can increase the smoothness of the main shaft 2 during long-term rotation, and can significantly reduce the heat generated when the main shaft 2 rotates, thereby reducing the overall temperature of the swing cylinder and improving the service life.

[0040] There is an oil cavity 8 between the housing 1, the main shaft 2 and the two sealing support sleeves 3, and the oil cavity 8 is used to transmit hydraulic oil.

[0041] An internal gear ring 6 and a rotary piston 7 are sequentially arranged from outside to inside between the middle position of the outer circumference of the main shaft 2 and the middle position of the inner circumference of the housing 1. The inner circumference of the internal gear ring 6 meshes with the outer circumference of one side of the rotary piston 7, and the inner circumference of the same side of the rotary piston 7 is rotationally and sealingly connected to the outer circumference of the main shaft 2.

[0042] The outer circumference of the other side of the rotary piston 7 is rotationally and sealingly connected to the inner circumference of the housing 1, and the inner circumference of the same side of the rotary piston 7 meshes with the outer circumference of the main shaft 2.

[0043] Under the thrust of the hydraulic oil entering the oil cavity 8, the rotary piston 7 can realize rotary translation between the internal gear ring 6 and the main shaft 2. While the rotary piston 7 rotates and translates, it drives the main shaft 2 to rotate.

[0044] The auxiliary rotary support device 4 is a thrust bearing. An installation hole 405 is provided in the middle position of the thrust bearing. The thrust bearing is fixed on the outer circumference position of the main shaft 2 through the installation hole 405.

[0045] The thrust bearing includes an inner ring 401 and an outer ring 403. The outer end of the inner ring 401 is fixedly connected to the main shaft 2, and the outer end of the outer ring 403 is fixedly connected to the sealing support sleeve 3.

[0046] A cage 402 is provided between the shaft ring 401 and the seat ring 403. A plurality of through holes are provided in the cage 402 along the circumferential direction. A plurality of rolling elements 404 are respectively provided in the through holes. The rolling elements 404 can rotate freely in the through holes. The plurality of rolling elements 404 support the shaft ring 401 and the seat ring 403 on both sides to achieve relative rotation.

[0047] ‌Since the thrust bearing has a strong load-bearing capacity and can withstand a large axial load, when the swing cylinder operates at a high load for a long time, the thrust bearing can also handle it easily without obvious flexural deformation. Moreover, the design and material selection of the thrust bearing have great flexibility, and the structure and material of the bearing can be adjusted according to specific usage requirements to adapt to different conditions such as axial load, rotational speed, and temperature.

[0048] More importantly, the thrust bearing has good wear resistance, water resistance, anti-pollution, high temperature resistance, etc., and can maintain good performance output in harsh environments.

[0049] Therefore, by using a thrust bearing for axial rotation support at this position in the swing cylinder, compared with the previous support wear pad, it has obvious advantages. First of all, since the thrust bearing uses rolling friction while the support wear pad uses mechanical sliding friction, when using the thrust bearing for rotation, the friction between the main shaft and the seal support sleeve and between the rotating support sleeve and the seal support sleeve during rotation is significantly reduced, thereby directly reducing the noise during the operation of the swing cylinder. And because the friction between the main shaft and the seal support sleeve and between the rotating support sleeve and the seal support sleeve during rotation is reduced, the rotation smoothness of the main shaft 2 and the stability of the rotation of the main shaft 2 are also significantly improved. More importantly, when the swing cylinder operates at a high load for a long time, the overall temperature of the swing cylinder will not increase significantly, thus ensuring that each oil seal ring in the cylinder has a lasting and stable sealing performance, thereby extending the overall service life of the swing cylinder.

[0050] The thickness of the thrust bearing is 10mm ± 2mm, and the thicknesses of the shaft ring 401 and the seat ring 403 are 2.5mm ± 0.5mm respectively.

[0051] Since the swing cylinder often needs to output a large torque for a long time in a harsh environment, at this time, higher requirements are placed on the impact resistance strength of the thrust bearing. Therefore, the corresponding components on the thrust bearing are thickened to enable it to easily handle the long-term large-torque output of the swing cylinder.

[0052] A groove is provided on the outermost shaft surface of the leftmost stepped shaft structure of the main shaft 2, and a dust-proof sealing ring 9 is provided in the groove. The outermost shaft surface of the leftmost stepped shaft structure of the main shaft 2 is rotationally and sealingly connected to the leftmost inner circumference of the outer housing 1 through the dust-proof sealing ring 9. A groove is provided on the outermost shaft surface of the rotating support sleeve 5, and a dust-proof sealing ring 9 is provided in the groove. The outermost shaft surface of the rotating support sleeve 5 is rotationally and sealingly connected to the rightmost inner circumference of the outer housing 1 through the dust-proof sealing ring 9.

[0053] The dust-proof sealing ring 9 can prevent dust and foreign objects in the external environment from entering the cylinder and damaging related components.

[0054] A wear-resistant support pad 10 is provided between the second outermost shaft surface of the leftmost stepped shaft structure of the main shaft 2 and the corresponding position of the inner circumference of the outer housing 1. The second outermost shaft surface of the leftmost stepped shaft structure of the main shaft 2 is rotationally supported and connected to the inner circumference of the outer housing 1 through the wear-resistant support pad 10. A wear-resistant support pad 10 is provided between the second outermost shaft surface of the rotating support sleeve 5 and the corresponding position of the inner circumference of the outer housing 1. The second outermost shaft surface of the rotating support sleeve 5 is rotationally supported and connected to the inner circumference of the outer housing 1 through the wear-resistant support pad 10.

[0055] Since the contact between the main shaft 2 and the outer housing 1 is radial and not the main force-bearing point during the operation of the swing cylinder, this position mainly plays a role in maintaining support stability. Therefore, a wear-resistant support pad 10 is used for rotational support at this place. The wear-resistant support pad is made of materials such as PTFE + copper powder, phenolic cloth laminated, wood tar, and nylon, which have high wear resistance, high support force, and high guiding stability. It can prevent direct friction between the main shaft 2 and the outer housing 1, resulting in an increase in the noise of the swing cylinder, and reduce the friction resistance between the main shaft 2 and the outer housing 1.

[0056] Grooves are respectively provided on the outer circumferences of the sealing support sleeves 3 on the left and right sides of the main shaft 2, and oil-sealing rings 11 are respectively provided in the grooves. The outer circumferences of the two sealing support sleeves 3 are respectively and sealingly and fixedly connected to the corresponding positions of the left and right inner circumferences of the outer housing 1 through the oil-sealing rings 11. Grooves are respectively provided on the inner circumferences of the sealing support sleeves 3 on the left and right sides of the main shaft 2, and oil-sealing rings 11 are provided in the grooves. The inner circumferences of the two sealing support sleeves 3 are respectively and rotationally and sealingly connected to the corresponding positions of the outer circumferences of the left and right sides of the main shaft 2 through the oil-sealing rings 11.

[0057] The rotary piston 7 includes a left end portion 701 and a right end portion 702 of the rotary piston. A groove is provided on the outer circumference of the left end portion 701 of the rotary piston. An oil seal ring 11 is provided in the groove. The outer circumference of the left end portion 701 of the rotary piston is rotationally sealed with the inner circumference of the outer housing 1 through the oil seal ring 11. A groove is provided at a position near the right side on the inner circumference of the right end portion 702 of the rotary piston. An oil seal ring 11 is provided in the groove. The inner circumference of the right end portion 702 of the rotary piston is rotationally sealed with the outer circumference of the main shaft 2 through the oil seal ring 11.

[0058] The left end portion 701 of the rotary piston divides the oil chamber 8 into a left oil chamber 801 and a right oil chamber 802. The left oil chamber 801 and the right oil chamber 802 are respectively communicated with the left oil hole and the right oil hole on the outer housing 1.

[0059] When the oil enters the left oil chamber 801 from the left oil hole, a thrust is applied to the left side of the rotary piston 7. The rotary piston 7 realizes rotational translation to the right through the meshing connection between its outer circumference and the internal gear ring 6. While the rotary piston 7 rotates and translates to the right, due to its meshing connection with the main shaft 2, it drives the main shaft 2 to rotate forward. While the main shaft 2 rotates forward, it drives the load to rotate in the same direction, realizing forward swinging operation.

[0060] When the oil enters the right oil chamber 802 from the right oil hole, a thrust is applied to the right side of the rotary piston 7. The rotary piston 7 realizes rotational translation to the left through the meshing connection between its outer circumference and the internal gear ring 6. While the rotary piston 7 rotates and translates to the left, due to its meshing connection with the main shaft 2, it drives the main shaft 2 to rotate reversely. While the main shaft 2 rotates reversely, it drives the load to rotate in the same direction, realizing reverse swinging operation.

[0061] Fixed support seats 12 are respectively fixedly provided on both sides of the bottom end outside the outer housing 1. The fixed support seats 12 are also thickened and widened so that they can withstand high-intensity impacts for a long time.

[0062] However, the above are only specific embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of patent protection of the present invention, should still fall within the scope covered by the claims of the present invention.

Claims

1. A swinging hydraulic cylinder with an auxiliary rotary support device, characterized in that: There is an outer housing, and a main shaft is provided inside the outer housing. The outermost left outer circumference of the main shaft is a stepped shaft structure. The outermost shaft surface of the stepped shaft structure of the main shaft is rotationally and sealingly connected to the innermost left inner circumference of the outer housing. A rotating support sleeve is provided between the outermost right outer circumference of the main shaft and the innermost right inner circumference of the outer housing. The rotating support sleeve is a stepped shaft structure. The inner circumference of the rotating support sleeve is fixedly connected to the outermost right outer circumference of the main shaft. The outermost shaft surface of the rotating support sleeve is rotationally and sealingly connected to the innermost right inner circumference of the outer housing; Sealing support sleeves are provided between the innermost shaft surface of the stepped shaft structure of the main shaft and the inner circumference of the outer housing, and at the adjacent position on the inner side of the rotating support sleeve where the outer circumference of the right side of the main shaft is located. The inner circumferences of the two sealing support sleeves are respectively rotationally and sealingly connected to the corresponding outer circumference positions of the main shaft. The outer circumferences of the two sealing support sleeves are respectively sealingly and fixedly connected to the corresponding inner circumference positions of the outer housing; There is a receiving cavity between the axially outer end of the sealing support sleeve on the left side of the main shaft and the main shaft. An auxiliary rotating support device is fixedly provided in the receiving cavity. The sealing support sleeve and the main shaft are rotationally supported by the auxiliary rotating support device; There is a receiving cavity between the axially outer end of the sealing support sleeve on the right side of the main shaft and the axially inner end of the rotating support sleeve. An auxiliary rotating support device is fixedly provided in the receiving cavity. The sealing support sleeve and the rotating support sleeve are rotationally supported by the auxiliary rotating support device; An oil cavity is provided among the outer housing, the main shaft, and the two sealing support sleeves; An internal gear ring and a rotating piston are sequentially arranged from outside to inside between the middle position of the outer circumference of the main shaft and the middle position of the inner circumference of the outer housing. The inner circumference of the internal gear ring meshes with the outer circumference of one side of the rotating piston. The inner circumference of the same side of the rotating piston is rotationally and sealingly connected to the outer circumference of the main shaft; The outer circumference of the other side of the rotating piston is rotationally and sealingly connected to the inner circumference of the outer housing. The inner circumference of the same side of the rotating piston meshes with the outer circumference of the main shaft.

2. The oscillating hydraulic cylinder with an auxiliary rotary support device according to claim 1, characterized in that: The auxiliary rotating support device is a thrust bearing. An installation hole is provided in the middle position of the thrust bearing. The thrust bearing is fixed on the outer circumference position of the main shaft through the installation hole; The thrust bearing includes an inner ring and an outer ring. The outer end of the inner ring is fixedly connected to the main shaft. The outer end of the outer ring is fixedly connected to the sealing support sleeve; A cage is provided between the inner ring and the outer ring. A plurality of through holes are provided in the cage along the circumferential direction. A plurality of rolling elements are respectively arranged in the plurality of through holes. The plurality of rolling elements support the inner ring and the outer ring on both sides to achieve relative rotation.

3. The oscillating hydraulic cylinder with an auxiliary rotary support device according to claim 2, characterized in that: The thickness of the thrust bearing is 10 mm ± 2 mm; The thicknesses of the inner ring and the outer ring are respectively 2.5 mm ± 0.5 mm.

4. The oscillating hydraulic cylinder with an auxiliary rotary support device according to any one of claims 1-3, characterized in that: A groove is provided on the outermost shaft surface of the outermost left stepped shaft structure of the main shaft. A dust-proof sealing ring is provided in the groove. The outermost shaft surface of the outermost left stepped shaft structure of the main shaft is rotationally and sealingly connected to the innermost left inner circumference of the outer housing through the dust-proof sealing ring; A groove is provided on the outermost axial surface of the rotary support sleeve, and a dust-proof sealing ring is provided in the groove. The outermost axial surface of the rotary support sleeve is rotationally and sealingly connected to the innermost circumference of the rightmost side of the outer housing through the dust-proof sealing ring.

5. The oscillating hydraulic cylinder with an auxiliary rotary support device according to any one of claims 1-3, characterized in that: A wear-resistant support pad is provided between the outer second axial surface of the outermost left stepped shaft structure of the main shaft and the corresponding position of the inner circumference of the outer housing. The outer second axial surface of the outermost left stepped shaft structure of the main shaft is rotationally supported and connected to the inner circumference of the outer housing through the wear-resistant support pad; A wear-resistant support pad is provided between the outer second axial surface of the rotary support sleeve and the corresponding position of the inner circumference of the outer housing. The outer second axial surface of the rotary support sleeve is rotationally supported and connected to the inner circumference of the outer housing through the wear-resistant support pad.

6. The oscillating hydraulic cylinder with an auxiliary rotary support device according to any one of claims 1-3, characterized in that: Grooves are respectively provided on the outer circumferences of the sealing support sleeves on the left and right sides of the main shaft, and oil-sealing rings are respectively provided in the grooves. The outer circumferences of the two sealing support sleeves are respectively and sealingly and fixedly connected to the corresponding positions of the inner circumferences of the left and right sides of the outer housing through the oil-sealing rings; Grooves are respectively provided on the inner circumferences of the sealing support sleeves on the left and right sides of the main shaft, and oil-sealing rings are provided in the grooves. The inner circumferences of the two sealing support sleeves are respectively rotationally and sealingly connected to the corresponding positions of the outer circumferences of the left and right sides of the main shaft through the oil-sealing rings.

7. The oscillating hydraulic cylinder with an auxiliary rotary support device according to any one of claims 1-3, characterized in that: The rotary piston includes a left end portion of the rotary piston and a right end portion of the rotary piston. A groove is provided on the outer circumference of the left end portion of the rotary piston, and an oil-sealing ring is provided in the groove. The outer circumference of the left end portion of the rotary piston is rotationally sealed with the inner circumference of the outer housing through the oil-sealing ring; A groove is provided at a position near the right side on the inner circumference of the right end portion of the rotary piston, and an oil-sealing ring is provided in the groove. The inner circumference of the right end portion of the rotary piston is rotationally sealed with the outer circumference of the main shaft through the oil-sealing ring; The left end portion of the rotary piston divides the oil chamber into a left oil chamber and a right oil chamber, and the left oil chamber and the right oil chamber are respectively communicated with a left oil hole and a right oil hole on the outer housing.

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