Static sealing supporting device for hydraulic oscillating cylinder

Abstract

The static sealing supporting device for the hydraulic oscillating cylinder comprises an oscillating cylinder shell and a main shaft, the main shaft comprises a main shaft left end portion and a main shaft right end portion, and a rotary supporting assembly is arranged between the axial outer side portion of the main shaft left end portion and the inner circumference of the left side of the oscillating cylinder shell. The axial outer side part of the left end of the main shaft and the inner circumference of the left side of the swing cylinder shell are in rotary supporting connection through a rotary supporting assembly, and a left side supporting sealing seat is arranged between the axial inner side part of the left end of the main shaft and the inner circumference of the swing cylinder shell. The outer circumference of the left side supporting sealing seat is fixedly connected with the swing cylinder shell in a sealing mode, and the inner circumference of the left side supporting sealing seat is connected with the outer circumference of the axial inner side part of the left end of the main shaft in a rotating and sealing mode. The technical problem that due to poor sealing between the outer circumference of an existing swing cylinder main shaft and a swing cylinder shell, hydraulic oil leaks outwards through a gap between the main shaft and the shell is solved. The utility model can be widely applied to hydraulic oscillating cylinders.

Description

Technical Field

[0001] The utility model relates to a sealing and supporting device, in particular to a static sealing and supporting device for a hydraulic swing cylinder. Background Art

[0002] A hydraulic swing cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy by driving with hydraulic oil. It can achieve swing motion and has the advantages of compact structure, safety and reliability, small occupied space, maintenance-free, high pressure, no leakage, extremely large output torque, etc., and is widely used in various mechanical fields.

[0003] In a hydraulic swing cylinder, there are relatively high standards for the sealing performance of the internal hydraulic oil. Currently, for the sealing of the internal hydraulic oil of the swing cylinder, mainly by installing oil seals on the outer circumferences on both sides of the main shaft. While the main shaft rotates, the hydraulic oil inside the hydraulic swing cylinder is isolated and sealed to prevent the hydraulic oil inside the hydraulic swing cylinder from leaking out through the gap between the main shaft and the housing.

[0004] However, due to the long-term rotation of the main shaft, it will cause varying degrees of wear to the oil seals, directly reducing the sealing effect of the oil seals, and ultimately resulting in the leakage of hydraulic oil through the gap between the main shaft and the housing, directly affecting the hydraulic driving effect during the operation of the swing cylinder. Summary of the Utility Model

[0005] The utility model aims at the above technical problems and provides a static sealing and supporting device for a hydraulic swing cylinder. In this static sealing and supporting device for a hydraulic swing cylinder, a left-side supporting and sealing seat is arranged between the fourth shaft section at the left end of the main shaft and the swing cylinder housing, and a right-side supporting and sealing seat is arranged between the right end of the main shaft and the swing cylinder housing. At the same time, the outer circumferences of the left-side supporting and sealing seat and the right-side supporting and sealing seat are respectively fixedly connected with the swing cylinder housing in a static sealing manner, and the inner circumferences of the left-side supporting and sealing seat and the right-side supporting and sealing seat are respectively rotationally sealed and connected with the outer circumference of the main shaft through oil seals.

[0006] Moreover, the oil seals are thickened to isolate and seal the hydraulic oil inside the swing cylinder in the oil cavity to the greatest extent, preventing the hydraulic oil in the oil cavity from leaking out through the gap between the main shaft and the housing and the gap between the main shaft and the left and right supporting and sealing seats during the operation of the swing cylinder, and not affecting the hydraulic driving effect during the operation of the swing cylinder.

[0007] For this reason, the technical solution of the utility model is a static sealing and supporting device for a hydraulic swing cylinder, which includes a swing cylinder housing. The inside of the swing cylinder housing is provided with a main shaft, and the main shaft includes a left end of the main shaft, and the left end of the main shaft is located on the left side of the main shaft;

[0008] A rotary support assembly is provided between the axially outer portion of the left end of the main shaft and the inner circumference on the left side of the swing cylinder housing, and the axially outer portion of the left end of the main shaft and the inner circumference on the left side of the swing cylinder housing are rotationally supported and connected through the rotary support assembly;

[0009] A left support seal seat is provided between the axially inner portion of the left end of the main shaft and the inner circumference of the swing cylinder housing. The outer circumference of the left support seal seat is fixedly connected in a sealed manner with the swing cylinder housing, and the inner circumference of the left support seal seat is rotationally and sealingly connected with the outer circumference of the axially inner portion of the left end of the main shaft.

[0010] Preferably, the swing cylinder housing includes a housing intermediate section, a housing left section, and a housing right section. The housing intermediate section is located at the middle position of the swing cylinder housing, the housing left section is located at the left side position of the swing cylinder housing, and the housing right section is located at the right side position of the swing cylinder housing;

[0011] The inner circumference of the housing intermediate section protrudes inward to form a locking and positioning boss.

[0012] Preferably, the left end of the main shaft has a stepped shaft structure. The left end of the main shaft includes a first shaft section of the left end of the main shaft, a second shaft section of the left end of the main shaft, a third shaft section of the left end of the main shaft, and a fourth shaft section of the left end of the main shaft. The first shaft section of the left end of the main shaft, the second shaft section of the left end of the main shaft, the third shaft section of the left end of the main shaft, and the fourth shaft section of the left end of the main shaft are arranged adjacent to each other from outside to inside in sequence, and the outer diameter dimensions of the first shaft section of the left end of the main shaft, the second shaft section of the left end of the main shaft, the third shaft section of the left end of the main shaft, and the fourth shaft section of the left end of the main shaft decrease in sequence;

[0013] The rotary support assembly is located between the outer circumference of the second shaft section of the left end of the main shaft and the inner circumference of the housing left section, and the second shaft section of the left end of the main shaft and the housing left section are rotationally supported and connected through the rotary support assembly;

[0014] The left support seal seat is located at the position between the outer circumference of the fourth shaft section of the left end of the main shaft and the inner circumference of the swing cylinder housing. The left support seal seat includes a first shaft section of the left support seal seat and a second shaft section of the left support seal seat. The first shaft section of the left support seal seat is located at the outer side position of the left support seal seat, and the second shaft section of the left support seal seat is located at the inner side position of the left support seal seat.

[0015] Preferably, the left support seal seat has a stepped shaft structure. The outer diameter dimension of the first shaft section of the left support seal seat is larger than the outer diameter dimension of the second shaft section of the left support seal seat. A shoulder is formed between the first shaft section of the left support seal seat and the second shaft section of the left support seal seat. The first shaft section of the left support seal seat is axially fixedly connected to the left end face of the locking and positioning boss at the radial face position of the shoulder;

[0016] The outer circumference of the second shaft section of the left support seal seat is provided with a sealing ring fixing groove, and a second hydraulic oil sealing ring is arranged in the sealing ring fixing groove. The outermost left position of the outer circumference of the second shaft section of the left support seal seat and the inner circumference of the locking and positioning boss are hermetically and fixedly connected through the second hydraulic oil sealing ring.

[0017] Preferably, the inner circumference of the left support seal seat is provided with a sealing ring fixing groove, and a first hydraulic oil sealing ring is arranged in the sealing ring fixing groove. The inner circumference of the left support seal seat and the outer circumference of the fourth shaft section at the left end of the main shaft are rotationally and hermetically connected through the first hydraulic oil sealing ring.

[0018] Preferably, the outermost position of the axial outer end face of the first shaft section of the left support seal seat is provided with a left support seal seat positioning boss protruding outwards. The axial outer end face of the left support seal seat positioning boss and the rotating support assembly are axially adjacent;

[0019] The inner circumference of the left support seal seat positioning boss is located at the radially symmetric position of the outer circumference of the third shaft section at the left end of the main shaft. An accommodation cavity is formed among the left support seal seat positioning boss, the first shaft section of the left support seal seat, the third shaft section at the left end of the main shaft, and the second shaft section at the left end of the main shaft. A support wear-resistant pad is arranged in the accommodation cavity. The second shaft section at the left end of the main shaft and the left support seal seat are rotationally supported and connected through the support wear-resistant pad.

[0020] Preferably, a support wear-resistant pad placement groove is arranged at the adjacent position between the axial outer end face of the first shaft section of the left support seal seat and the inner circumference of the left support seal seat positioning boss. An accommodation cavity is formed among the left support seal seat positioning boss, the support wear-resistant pad placement groove, the third shaft section at the left end of the main shaft, and the second shaft section at the left end of the main shaft. A support wear-resistant pad is arranged in the accommodation cavity. The second shaft section at the left end of the main shaft and the left support seal seat are rotationally supported and connected through the support wear-resistant pad.

[0021] Preferably, the outer circumference of the first shaft section at the left end of the main shaft is provided with a sealing ring fixing groove, and a dust-proof sealing ring is arranged in the sealing ring fixing groove. The first shaft section at the left end of the main shaft and the left section of the housing are rotationally and hermetically connected through the dust-proof sealing ring.

[0022] Preferably, an avoidance groove is arranged at the middle position on the axial inner side of the second shaft section of the left support seal seat.

[0023] Preferably, the thickness of the first hydraulic oil sealing ring is 6mm ± 1mm.

[0024] The beneficial effects of the utility model are:

[0025] 1. By respectively arranging a left support seal seat and a right support seal seat on the left and right sides inside the swing cylinder, the outer circumferences of the left support seal seat and the right support seal seat are respectively and sealingly fixedly connected with the swing cylinder housing, and the inner circumferences of the left support seal seat and the right support seal seat are respectively rotationally and sealingly connected with the main shaft, which can further prevent the lubricating oil in the oil cavity from leaking outwards;

[0026] Compared with the existing design, the dynamic rotational seal between the main shaft and the swing cylinder housing is improved to use the left support seal seat and the right support seal seat, realizing a static seal fixed structure. When the main shaft rotates, the left support seal seat and the right support seal seat remain stationary continuously, achieving efficient and durable sealing between the left support seal seat and the right support seal seat and the swing cylinder housing;

[0027] Meanwhile, a first hydraulic oil sealing ring is arranged between the left and right support seal seats and the main shaft to realize a rotational seal connection structure. Moreover, due to the structural characteristics of the main shaft, during the processing of the main shaft, the positions on the main shaft corresponding to the left and right support seal seats can be precisely polished by a grinding machine, improving the flatness of the corresponding outer circumferential surface, thereby enhancing the compaction sealing effect between the first hydraulic oil sealing ring and the outer circumference of the main shaft, further improving the sealing performance during the rotation between the main shaft and the left and right support seal seats, and continuously and stably isolating and sealing the hydraulic oil in the oil cavity.

[0028] 2. By respectively arranging support wear-resistant pad placement grooves on the left support seal seat and the right support seal seat, the axially inner ends of the support wear-resistant pads are located inside the support wear-resistant pad placement grooves, and the support wear-resistant pads are limited and fixed by the support wear-resistant pad placement grooves, which can prevent the support wear-resistant pads from shifting and shaking when the main shaft rotates, increasing the stability when the main shaft rotates;

[0029] And, according to the actual operation requirements, the axially inner end faces of the two support wear-resistant pads can be respectively fixedly connected with the support wear-resistant pad placement grooves and the axially grooved surfaces of the support wear-resistant pad placement grooves, so that when the main shaft rotates, the axially inner ends of the two support wear-resistant pads are respectively in a static fixed state with the support wear-resistant pad placement grooves and the axially grooved surfaces of the support wear-resistant pad placement grooves, and the axially outer ends of the support wear-resistant pads and the main shaft are in a normal support and rotation state, maximizing the prevention of the support wear-resistant pads from shaking when the main shaft rotates and improving the overall operation stability of the swing cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the left support seal seat in the present utility model;

[0031] Figure 2 is a schematic structural diagram of the right support seal seat in the present utility model;

[0032] Figure 3 is the D-D cross-sectional view of the present utility model Figure 1 ;

[0033] Figure 4 is the E-E cross-sectional view of the present utility model Figure 2 ;

[0034] Figure 5 is the three-dimensional view of the hydraulic swing cylinder applied by the present utility model

[0035] Figure 6 is another three-dimensional view of the hydraulic swing cylinder applied by the present utility model

[0036] Figure 7 is the front view of the hydraulic swing cylinder applied by the present utility model

[0037] Figure 8 is the A-A cross-sectional view of the present utility model Figure 7 ;

[0038] Figure 9 is the enlarged view at position B of the present utility model Figure 8 ;

[0039] Figure 10 is the enlarged view at position C of the present utility model Figure 8 ;

[0040] Explanation of symbols in the figure:

[0041] 1. Swing cylinder housing; 101. Middle section of the housing; 10101. Locking and positioning boss; 102. Left section of the housing; 103. Right section of the housing; 2. Fixed seat; 3. Left oil hole; 4. Right oil hole; 5. Main shaft; 501. Left end of the main shaft; 50101. First shaft section of the left end of the main shaft; 50102. Second shaft section of the left end of the main shaft; 50103. Third shaft section of the left end of the main shaft; 50104. Fourth shaft section of the left end of the main shaft; 502. Middle end of the main shaft; 50201. Left-side rotation drive section; 50202. Right-side rotation seal section; 503. Right end of the main shaft; 6. Right-side rotary support seat for the main shaft; 601. First shaft section of the right-side rotary support seat for the main shaft; 602. Second shaft section of the right-side rotary support seat for the main shaft; 603. Third shaft section of the right-side rotary support seat for the main shaft; 7. Internal gear ring; 8. Left-side support and seal seat; 801. First shaft section of the left-side support and seal seat; 802. Second shaft section of the left-side support and seal seat; 803. Shoulder; 804. Positioning boss of the left-side support and seal seat; 805. Placing groove for the support wear-resistant pad; 806. Fixed mounting hole; 9. Right-side support and seal seat; 901. First shaft section of the right-side support and seal seat; 902. Second shaft section of the right-side support and seal seat; 903. Shoulder; 904. Positioning boss of the right-side support and seal seat; 905. Placing groove for the support wear-resistant pad; 906. Fixed mounting hole; 10. Rotary piston; 1001. Left end of the rotary piston; 1002. Middle end of the rotary piston; 1003. Right end of the rotary piston; 11. Oil cavity; 1101. Left oil cavity; 1102. Right oil cavity; 12. Relief groove; 13. First hydraulic oil seal ring; 14. Second hydraulic oil seal ring; 15. Third hydraulic oil seal ring; 17. Fifth hydraulic oil seal ring; 18. Dust-proof seal ring; 20. Support wear-resistant pad; 21. Rotary support assembly; 22. Seal fixing groove; 23. Chamfer. Detailed implementation mode

[0042] The following further describes the present utility model in conjunction with embodiments.

[0043] Through Figures 1 - 10 It can be seen that the static seal support device for the hydraulic swing cylinder is provided with a swing cylinder housing 1.

[0044] Inside the swing cylinder housing 1 is provided a main shaft 5, the main shaft 5 can achieve forward and reverse rotational swing, the main shaft 5 includes a left end 501 of the main shaft, a middle end 502 of the main shaft and a right end 503 of the main shaft, the middle end 502 of the main shaft is located at the middle position of the main shaft 5, the left end 501 of the main shaft is located at the left position of the main shaft 5, and the right end 503 of the main shaft is located at the right position of the main shaft 5.

[0045] The axially outer part of the left end 501 of the main shaft is located at the outermost position inside the left side of the swing cylinder housing 1.

[0046] A rotary support assembly 21 is provided between the axially outer part of the left end portion 501 of the main shaft and the swing cylinder housing 1, and the axially outer part of the left end portion 501 of the main shaft and the swing cylinder housing 1 are rotationally supported and connected through the rotary support assembly 21.

[0047] A left support seal seat 8 is provided between the axially inner part of the left end portion 501 of the main shaft and the swing cylinder housing 1. A through fixed mounting hole 806 is provided at the central position of the left support seal seat 8. The outer circumference of the left support seal seat 8 and the swing cylinder housing 1 are hermetically and fixedly connected, and the inner circumference of the left support seal seat 8 and the outer circumference of the axially inner part of the left end portion 501 of the main shaft are rotationally sealed and connected.

[0048] A right main shaft rotary support seat 6 is provided between the outermost position of the outer circumference of the right end portion 503 of the main shaft and the outermost position on the right side of the inner circumference of the swing cylinder housing 1. The inner circumference of the right main shaft rotary support seat 6 and the outermost position of the outer circumference of the right end portion 503 of the main shaft are fixedly connected.

[0049] A rotary support assembly 21 is provided between the outer circumference of the right main shaft rotary support seat 6 and the swing cylinder housing 1, and the outer circumference of the right main shaft rotary support seat 6 and the swing cylinder housing 1 are rotationally supported and connected through the rotary support assembly 21.

[0050] A right support seal seat 9 is provided between the outer circumference of the right end portion 503 of the main shaft at the position adjacent to the axially inner side of the right main shaft rotary support seat 6 and the inner circumference of the swing cylinder housing 1. A through fixed mounting hole 906 is provided at the central position of the right support seal seat 9. The outer circumference of the right support seal seat 9 and the swing cylinder housing 1 are hermetically and fixedly connected, and the inner circumference of the right support seal seat 9 and the outer circumference of the right end portion 503 of the main shaft are rotationally sealed and connected.

[0051] The swing cylinder housing 1 includes a housing intermediate section 101, a housing left section 102, and a housing right section 103. The housing intermediate section 101 is located at the middle position of the swing cylinder housing 1, the housing left section 102 is located at the left side position of the swing cylinder housing 1, and the housing right section 103 is located at the right side position of the swing cylinder housing 1.

[0052] The left end portion 501 of the main shaft has a stepped shaft structure. The left end portion 501 of the main shaft includes a first shaft section 50101 of the left end portion of the main shaft, a second shaft section 50102 of the left end portion of the main shaft, a third shaft section 50103 of the left end portion of the main shaft, and a fourth shaft section 50104 of the left end portion of the main shaft. The first shaft section 50101 of the left end portion of the main shaft, the second shaft section 50102 of the left end portion of the main shaft, the third shaft section 50103 of the left end portion of the main shaft, and the fourth shaft section 50104 of the left end portion of the main shaft are arranged adjacent to each other in sequence from the outside to the inside, and the outer diameter dimensions of the first shaft section 50101 of the left end portion of the main shaft, the second shaft section 50102 of the left end portion of the main shaft, the third shaft section 50103 of the left end portion of the main shaft, and the fourth shaft section 50104 of the left end portion of the main shaft decrease in sequence.

[0053] The first shaft section 50101 at the left end of the main shaft is located at the outermost position inside the left section 102 of the housing. The second shaft section 50102 at the left end of the main shaft is located at the middle position inside the left section 102 of the housing. The third shaft section 50103 and the fourth shaft section 50104 at the left end of the main shaft are arranged in sequence from the outside to the inside along the inside of the left section 102 of the housing.

[0054] The rotary support assembly 21 is located between the outer circumference of the second shaft section 50102 at the left end of the main shaft and the inner circumference of the left section 102 of the housing. The second shaft section 50102 at the left end of the main shaft and the left section 102 of the housing are rotationally supported and connected through the rotary support assembly 21.

[0055] The rotary support seat 6 on the right side of the main shaft has a stepped shaft structure. The rotary support seat 6 on the right side of the main shaft includes a first shaft section 601 of the rotary support seat on the right side of the main shaft, a second shaft section 602 of the rotary support seat on the right side of the main shaft, and a third shaft section 603 of the rotary support seat on the right side of the main shaft. The first shaft section 601 of the rotary support seat on the right side of the main shaft, the second shaft section 602 of the rotary support seat on the right side of the main shaft, and the third shaft section 603 of the rotary support seat on the right side of the main shaft are adjacent to each other in sequence from the outside to the inside, and the outer diameter dimensions of the first shaft section 601 of the rotary support seat on the right side of the main shaft, the second shaft section 602 of the rotary support seat on the right side of the main shaft, and the third shaft section 603 of the rotary support seat on the right side of the main shaft decrease in sequence.

[0056] The first shaft section 601 of the rotary support seat on the right side of the main shaft is located at the outermost position inside the right section 103 of the housing. The second shaft section 602 of the rotary support seat on the right side of the main shaft and the third shaft section 603 of the rotary support seat on the right side of the main shaft are arranged in sequence from the outside to the inside along the inside of the right section 103 of the housing.

[0057] The rotary support assembly 21 is located between the outer circumference of the second shaft section 602 of the rotary support seat on the right side of the main shaft and the inner circumference of the right section 103 of the housing. The second shaft section 602 of the rotary support seat on the right side of the main shaft and the right section 103 of the housing are rotationally supported and connected through the rotary support assembly 21.

[0058] The left support and seal seat 8 is located between the outer circumference of the fourth shaft section 50104 at the left end of the main shaft and the inner circumference of the swing cylinder housing 1. The left support and seal seat 8 includes a first shaft section 801 of the left support and seal seat and a second shaft section 802 of the left support and seal seat. The first shaft section 801 of the left support and seal seat is located at the outer side position of the left support and seal seat 8, and the second shaft section 802 of the left support and seal seat is located at the inner side position of the left support and seal seat 8.

[0059] The first shaft section 801 of the left support and seal seat is located at the innermost position inside the left section 102 of the housing. The second shaft section 802 of the left support and seal seat is located at the leftmost position of the middle section 101 of the housing.

[0060] The outermost circumference of the first shaft section 801 of the left support seal seat is fixedly connected to the innermost position of the inner circumference of the left section 102 of the housing. The outer circumference of the second shaft section 802 of the left support seal seat is provided with a seal ring fixing groove 22. A second hydraulic oil seal ring 14 is arranged in the seal ring fixing groove 22. The outer circumference of the second shaft section 802 of the left support seal seat and the leftmost position of the middle section 101 of the housing are hermetically and fixedly connected through the second hydraulic oil seal ring 14.

[0061] The inner circumference of the left support seal seat 8 is provided with a seal ring fixing groove 22. A first hydraulic oil seal ring 13 is arranged in the seal ring fixing groove 22. The inner circumference of the left support seal seat 8 and the outer circumference of the fourth shaft section 50104 at the left end of the main shaft are rotationally and hermetically connected through the first hydraulic oil seal ring 13.

[0062] The right support seal seat 9 includes a first shaft section 901 of the right support seal seat and a second shaft section 902 of the right support seal seat. The first shaft section 901 of the right support seal seat is located at the outer side position of the right support seal seat 9. The second shaft section 902 of the right support seal seat is located at the inner side position of the right support seal seat 9.

[0063] The first shaft section 901 of the right support seal seat is located at the innermost position inside the right section 103 of the housing. The second shaft section 902 of the right support seal seat is located at the rightmost position of the middle section 101 of the housing. The outer circumference of the first shaft section 901 of the right support seal seat is fixedly connected to the innermost position of the inner circumference of the right section 103 of the housing. The outer circumference of the second shaft section 902 of the right support seal seat is provided with a seal ring fixing groove 22. A second hydraulic oil seal ring 14 is arranged in the seal ring fixing groove 22. The outer circumference of the second shaft section 902 of the right support seal seat and the rightmost position of the middle section 101 of the housing are hermetically and fixedly connected through the second hydraulic oil seal ring 14.

[0064] The inner circumference of the right support seal seat 9 is provided with a seal ring fixing groove 22. A first hydraulic oil seal ring 13 is arranged in the seal ring fixing groove 22. The inner circumference of the right support seal seat 9 and the outer circumference of the right end 503 of the main shaft are rotationally and hermetically connected through the first hydraulic oil seal ring 13 at the axially inner adjacent position of the right-side rotating support seat 6 of the main shaft.

[0065] The above technical solutions can achieve obvious technical effects in implementation, as follows:

[0066] 1. By setting the axially outer part of the left end of the main shaft 501 at the outermost position inside the left side of the swing cylinder housing 1, and setting the right-side rotary support seat 6 of the main shaft between the outermost position of the outer circumference of the right end 503 of the main shaft and the outermost position of the right side of the inner circumference of the swing cylinder housing 1, when the main shaft 5 rotates, since the main torsional support force between the main shaft 5 and the swing cylinder housing 1 is located at the outermost positions at both ends of the housing, the main shaft can obtain sufficient anti-torsion support torque to meet the output of large torque.

[0067] 2. By respectively arranging a left-side support seal seat 8 and a right-side support seal seat 9 on the left and right sides inside the swing cylinder, the outer circumferences of the left-side support seal seat 8 and the right-side support seal seat 9 are respectively and fixedly connected in a sealed manner with the swing cylinder housing 1, and the inner circumferences of the left-side support seal seat 8 and the right-side support seal seat 9 are respectively rotationally and sealedly connected with the main shaft 5, it is possible to further prevent the lubricating oil in the oil chamber 11 from leaking outwards.

[0068] Specifically, compared with the existing design, the dynamic rotary seal between the main shaft 5 and the swing cylinder housing 1 is improved to a static seal fixed structure using the left-side support seal seat 8 and the right-side support seal seat 9. When the main shaft 5 rotates, the left-side support seal seat 8 and the right-side support seal seat 9 remain stationary continuously, and efficient and durable sealing is achieved between the left-side support seal seat 8 and the right-side support seal seat 9 and the swing cylinder housing.

[0069] At the same time, a first hydraulic oil sealing ring 13 is provided between the left and right support seal seats and the main shaft 5 to realize a rotary seal connection structure. And due to the structural characteristics of the main shaft 5, during the processing of the main shaft 5, the positions on the main shaft 5 corresponding to the left and right support seal seats can be finely polished using a grinding machine, improving the flatness of the corresponding outer circumferential surface, thereby improving the compaction sealing effect between the first hydraulic oil sealing ring 13 and the outer circumference of the main shaft 5, further improving the sealing performance during the rotation between the main shaft 5 and the left and right support seal seats, and continuously and stably isolating and sealing the hydraulic oil in the oil chamber 11.

[0070] At the outermost position of the axially outer end face of the first shaft section 801 of the left-side support seal seat, there is an outwardly protruding left-side support seal seat positioning boss 804. The axially outer end face of the left-side support seal seat positioning boss 804 is axially adjacent to the rotary support assembly 21, which can play a certain axial limiting role on the rotary support assembly 21 to prevent the rotary support assembly 21 from having an axial offset when the main shaft 5 rotates.

[0071] The inner circumference of the positioning boss 804 of the left support seal seat is located at the radially symmetric position of the outer circumference of the third shaft section 50103 at the left end of the main shaft. An accommodation cavity is formed among the positioning boss 804 of the left support seal seat, the first shaft section 801 of the left support seal seat, the third shaft section 50103 at the left end of the main shaft, and the second shaft section 50102 at the left end of the main shaft. A support wear pad 20 is arranged in the accommodation cavity. The second shaft section 50102 at the left end of the main shaft and the left support seal seat 8 are rotationally supported and connected through the support wear pad 20.

[0072] Another structural solution of the left support seal seat 8 is that a support wear pad placement groove 805 is arranged at the adjacent position of the axially outer end face of the first shaft section 801 of the left support seal seat and the inner circumference of the positioning boss 804 of the left support seal seat. An accommodation cavity is formed among the positioning boss 804 of the left support seal seat, the support wear pad placement groove 805, the third shaft section 50103 at the left end of the main shaft, and the second shaft section 50102 at the left end of the main shaft. A support wear pad 20 is arranged in the accommodation cavity. The second shaft section 50102 at the left end of the main shaft and the left support seal seat 8 are rotationally supported and connected through the support wear pad 20, which can further limit and fix the support wear pad 20, further reduce the shaking amplitude of the support wear pad 20 when the main shaft 5 rotates, and increase the stability when the main shaft 5 rotates.

[0073] At the outermost position of the axially outer end face of the first shaft section 901 of the right support seal seat, there is a right support seal seat positioning boss 904 protruding outward. The axially outer end face of the right support seal seat positioning boss 904 and the rotary support assembly 21 are axially adjacent. The inner circumference of the right support seal seat positioning boss 904 is located at the radially symmetric position of the outer circumference of the third shaft section 603 of the right rotary support seat of the main shaft. An accommodation cavity is formed among the right support seal seat positioning boss 904, the first shaft section 901 of the right support seal seat, the third shaft section 603 of the right rotary support seat of the main shaft, and the second shaft section 602 of the right rotary support seat of the main shaft. A support wear pad 20 is arranged in the accommodation cavity. The second shaft section 602 of the right rotary support seat of the main shaft and the right support seal seat 9 are rotationally supported and connected through the support wear pad 20.

[0074] The supporting wear-resistant pad 20 is made of materials such as PTFE + copper powder, phenolic cloth, wood, and nylon, which have high wear resistance, high dry running characteristics, high supporting force, and high guiding stability. By setting the supporting wear-resistant pad 20, the smoothness of the relative rotation between the left end portion 501 of the main shaft and the left supporting seal seat 8, and between the right rotating supporting seat 6 of the main shaft and the right supporting seal seat 9 can be improved respectively, avoiding the direct friction between the second shaft section 50102 of the left end portion of the main shaft and the left supporting seal seat 8, and between the right rotating supporting seat 6 of the main shaft and the right supporting seal seat 9, resulting in knocking and wear between the second shaft section 50102 of the left end portion of the main shaft and the left supporting seal seat 8, and between the right rotating supporting seat 6 of the main shaft and the right supporting seal seat 9, and reducing the service life.

[0075] Moreover, the supporting wear-resistant pad 20 also has good heat conduction performance, which can reduce the temperature of its surrounding components.

[0076] On the axial outer end face of the first shaft section 901 of the right supporting seal seat, a supporting wear-resistant pad placement groove 905 is provided at a position adjacent to the inner circumference of the positioning boss 904 of the right supporting seal seat. An accommodation cavity is formed among the right supporting seal seat positioning boss 904, the supporting wear-resistant pad placement groove 905, the third shaft section 603 of the right rotating supporting seat of the main shaft, and the second shaft section 602 of the right rotating supporting seat of the main shaft. The supporting wear-resistant pad 20 is arranged in the accommodation cavity, and the second shaft section 602 of the right rotating supporting seat of the main shaft and the right supporting seal seat 9 are rotationally supported and connected through the supporting wear-resistant pad 20.

[0077] According to the actual operation requirements, the axial inner end faces of the two supporting wear-resistant pads 20 can be fixedly connected to the axial groove faces of the supporting wear-resistant pad placement groove 805 and the supporting wear-resistant pad placement groove 905 respectively, so that when the main shaft 5 rotates, the axial inner end parts of the two supporting wear-resistant pads 20 are in a static fixed state with the supporting wear-resistant pad placement groove 805 and the supporting wear-resistant pad placement groove 905 respectively, and the axial outer end part of the supporting wear-resistant pad 20 and the main shaft 5 are in a normal supporting rotation state, maximizing the avoidance of the situation that the supporting wear-resistant pad 20 shakes when the main shaft 5 rotates, and improving the overall operation stability of the swing cylinder.

[0078] Embodiment 1

[0079] The rotating support assembly 21 between the outer circumference of the second shaft section 50102 of the left end portion of the main shaft and the inner circumference of the left section 102 of the housing is a non-lubricated bearing. The second shaft section 50102 of the left end portion of the main shaft and the left section 102 of the housing are rotationally supported and connected through the non-lubricated bearing. The rotating support assembly 21 between the outer circumference of the second shaft section 602 of the right rotating supporting seat of the main shaft and the inner circumference of the right section 103 of the housing is a non-lubricated bearing. The second shaft section 602 of the right rotating supporting seat of the main shaft and the right section 103 of the housing are rotationally supported and connected through the non-lubricated bearing.

[0080] The oil-free bearing has excellent self-lubricating performance, which can eliminate the environmental pollution problems caused by lubricating oil leakage. Moreover, the oil-free bearing has excellent high and low temperature resistance characteristics and can operate within an extreme temperature range, such as the theoretical temperature range of -200°C to 600°C. At extreme temperatures, the oil-free bearing can still maintain excellent durability and performance stability, further expanding the application environment range of the hydraulic swing cylinder. To the greatest extent, it ensures that when the hydraulic swing cylinder is applied in extreme environments, it can also exert its excellent operating performance. Additionally, the oil-free bearing has sufficient support strength to ensure that when the swing cylinder performs high-torque output operations, the oil-free bearing can provide sufficient support force on both sides of the swing cylinder.

[0081] Example 2

[0082] The rotary support assembly 21 between the outer circumference of the second shaft section 50102 at the left end of the main shaft and the inner circumference of the left section 102 of the housing is a self-lubricating bushing. The rotation support connection between the second shaft section 50102 at the left end of the main shaft and the left section 102 of the housing is achieved through the self-lubricating bushing. The rotary support assembly 21 between the outer circumference of the second shaft section 602 of the rotary support seat at the right end of the main shaft and the inner circumference of the right section 103 of the housing is a self-lubricating bushing. The rotation support connection between the second shaft section 602 of the rotary support seat at the right end of the main shaft and the right section 103 of the housing is achieved through the self-lubricating bushing.

[0083] The self-lubricating bushing has the characteristics of good wear resistance, small friction coefficient, and long service life, which can effectively improve the stability and durability of mechanical movement. Moreover, the self-lubricating bushing has a low friction coefficient, which can reduce frictional heat and wear, further increasing the service life of the main shaft 5 and the swing cylinder housing 1.

[0084] Using a self-lubricating bushing can improve the support structure. Specifically, traditional support wear pads need to be lubricated in hydraulic oil, so sealing grooves need to be opened on the outer circumference of the bearing to place the support wear pads. Therefore, the support wear pads need to be thickened to achieve a contact sealing effect between the support wear pads and the swing cylinder housing 1. However, if the thickness of the support wear pad is too thick, its hardness will decrease. When the main shaft 5 rotates, the support wear pad will vibrate to varying degrees. The long-term vibration of the support wear pad will directly reduce the sealing performance between the main shaft 5 and the swing cylinder housing 1.

[0085] Moreover, the long-term vibration of the support wear pad will directly reduce the stability of the main shaft 5 during rotation, and even cause problems such as jamming of the main shaft 5 during rotation, affecting the overall operating stability of the swing cylinder.

[0086] However, excellent lubrication effect can be achieved by using grease lubrication for the self-lubricating bushing. Therefore, there is no need to open a sealing groove on the outer circumference of the main shaft 5 to place the self-lubricating bearing bushing. It is only necessary to fix the self-lubricating bearing bushing between the main shaft 5 and the swing cylinder housing 1, and there is no need to thicken the self-lubricating bushing. Thus, not only can excellent sealing performance between the main shaft 5 and the swing cylinder housing 1 be ensured, but also sufficient supporting force can be provided when the main shaft 5 rotates, ensuring the stability of the main shaft 5 during rotation and increasing the service life of the swing cylinder.

[0087] At the same time, the self-lubricating bushing has appropriate elastoplasticity, which can distribute stress on a wider contact surface, improve the load-bearing capacity, and further ensure the stability of the main shaft 5 during swinging.

[0088] Moreover, the self-lubricating bushing can reduce the vibration and noise during the operation of the swing cylinder, improving the smoothness of operation.

[0089] The inner circumference of the middle section 101 of the housing protrudes inward to form a locking and positioning boss 10101. The left support seal seat 8 is a stepped shaft structure. The outer diameter of the first shaft section 801 of the left support seal seat is larger than the outer diameter of the second shaft section 802 of the left support seal seat. A shoulder 803 is formed between the first shaft section 801 and the second shaft section 802 of the left support seal seat. The first shaft section 801 of the left support seal seat is axially fixedly connected to the left end face of the locking and positioning boss 10101 at the radial plane position of the shoulder 803. The second shaft section 802 of the left support seal seat is radially and hermetically fixedly connected to the innermost circumference on the leftmost side of the locking and positioning boss 10101 through a second hydraulic oil seal 14 at the axial plane position of the shoulder 803.

[0090] The right support seal seat 9 is a stepped shaft structure. The outer diameter of the first shaft section 901 of the right support seal seat is larger than the outer diameter of the second shaft section 902 of the right support seal seat. A shoulder 903 is formed between the first shaft section 901 and the second shaft section 902 of the right support seal seat. The first shaft section 901 of the right support seal seat is axially fixedly connected to the right end face of the locking and positioning boss 10101 at the radial plane position of the shoulder 903. The second shaft section 902 of the right support seal seat is radially and hermetically fixedly connected to the innermost circumference on the rightmost side of the locking and positioning boss 10101 through a second hydraulic oil seal 14 at the axial plane position of the shoulder 903.

[0091] Axially fixing and locking the left support seal seat 8 and the right support seal seat 9 to the locking and positioning boss 10101 respectively can further ensure that the left support seal seat 8 and the right support seal seat 9 are continuously in a static locking state, avoiding the displacement of the left support seal seat 8 or the right support seal seat 9 caused by the long-term rotation of the main shaft 5, thereby further ensuring the sealing effect between the left support seal seat 8 and the right support seal seat 9 and the main shaft 5 and the swing cylinder housing 1 respectively.

[0092] A seal ring fixing groove 22 is provided on the outer circumference of the first shaft section 50101 at the left end of the main shaft. A dust-proof seal ring 18 is provided in the seal ring fixing groove 22. The first shaft section 50101 at the left end of the main shaft and the left section 102 of the housing are rotationally and sealingly connected through the dust-proof seal ring 18. A seal ring fixing groove 22 is provided on the outer circumference of the first shaft section 601 of the right rotating support seat of the main shaft. A dust-proof seal ring 18 is provided in the seal ring fixing groove 22. The first shaft section 601 of the right rotating support seat of the main shaft and the right section 103 of the housing are rotationally and sealingly connected through the dust-proof seal ring 18.

[0093] The dust-proof seal ring 18 can block foreign matters such as dust and powder in the external environment outside the swing cylinder, avoiding problems such as friction and damage between related components caused by the entry of foreign matters such as dust and powder in the external environment into the swing cylinder.

[0094] The axially outermost end face of the left end of the main shaft 501 is located outside the axially outermost end face of the left section 102 of the housing. The axially outermost end face of the right rotating support seat 6 of the main shaft is located outside the axially outermost end face of the right section 103 of the housing.

[0095] In this structural design, when foreign matters such as dust and powder in the external environment fall on the two end faces of the swing cylinder housing 1 or the two end faces of the main shaft 5, under the action of the centrifugal force generated by the rotation of the main shaft 5, the dust, powder and other foreign matters can be quickly thrown out, or under the action of the airflow generated by the centrifugal force of the rotation of the main shaft 5, the dust, powder and other foreign matters can be blown away, avoiding the accumulation of dust, powder and other foreign matters at both ends of the swing cylinder. If the axially outermost end faces of the left end of the main shaft 501 and the right rotating support seat 6 of the main shaft are respectively located inside the left section 102 and the right section 103 of the housing, groove surfaces will be formed respectively between the outermost end face of the left end of the main shaft 501 and the inner circumference of the left section 102 of the housing and between the outermost end face of the right rotating support seat 6 of the main shaft and the inner circumference of the right section 103 of the housing. Foreign matters are more likely to accumulate in the groove surfaces. Moreover, when foreign matters accumulate in the groove surfaces, due to the shielding of the outer end faces of the left section 102 and the right section 103 of the housing on the foreign matters, it is impossible to throw out the foreign matters by the rotation of the main shaft 5.

[0096] An oil chamber 11 is formed among the middle end portion 502 of the main shaft, the left support seal seat 8, the right support seal seat 9, and the middle section 101 of the housing.

[0097] A rotary piston 10 is provided between the outer circumference of the middle end portion 502 of the main shaft and the inner circumference of the middle section 101 of the housing. The rotary piston 10 includes a left end portion 1001 of the rotary piston, a middle end portion 1002 of the rotary piston, and a right end portion 1003 of the rotary piston. The middle end portion 1002 of the rotary piston is located at the middle position of the rotary piston 10, the left end portion 1001 of the rotary piston is located at the left position of the rotary piston 10, and the right end portion 1003 of the rotary piston is located at the right position of the rotary piston 10.

[0098] The middle end portion 502 of the main shaft includes a left rotary drive portion 50201 and a right rotary seal portion 50202. The left rotary drive portion 50201 is located at the left position of the middle end portion 502 of the main shaft, and the right rotary seal portion 50202 is located at the right position of the middle end portion 502 of the main shaft.

[0099] Helical teeth that mesh with each other are respectively provided on the inner circumference of the left end portion 1001 of the rotary piston and the outer circumference of the left rotary drive portion 50201. A seal ring fixing groove 22 is provided on the outer circumference of the left end portion 1001 of the rotary piston. A third oil seal ring 15 is provided in the seal ring fixing groove 22. The outer circumference of the left end portion 1001 of the rotary piston is rotatably and sealingly connected to the inner circumference of the middle section 101 of the housing through the third oil seal ring 15.

[0100] A seal ring fixing groove 22 is provided on the inner circumference of the right end portion 1003 of the rotary piston. A fifth oil seal ring 17 is provided in the seal ring fixing groove 22. The inner circumference of the right end portion 1003 of the rotary piston is rotatably and sealingly connected to the outer circumference of the right rotary seal portion 50202 through the fifth oil seal ring 17.

[0101] The rotary piston 10 divides the oil chamber 11 into two parts, namely a left oil chamber 1101 and a right oil chamber 1102, through the rotary and sealing connection between the left end portion 1001 of the rotary piston and the inner circumference of the middle section 101 of the housing and the rotary and sealing connection between the right end portion 1003 of the rotary piston and the outer circumference of the right rotary seal portion 50202. A left oil hole 3 and a right oil hole 4 are provided on the swing cylinder housing 1. The left oil hole 3 communicates with the left oil chamber 1101, and the right oil hole 4 communicates with the right oil chamber 1102.

[0102] An internal gear ring 7 is provided between the outer circumference of the right end portion 1003 of the rotary piston and the inner circumference of the middle section 101 of the housing. The outer circumference of the internal gear ring 7 is fixedly connected to the inner circumference of the middle section 101 of the swing housing. Helical teeth that mesh with each other are respectively provided on the inner circumference of the internal gear ring 7 and the outer circumference of the right end portion 1003 of the rotary piston.

[0103] The rotary piston 10 can achieve left - right rotary translation between the internal gear ring 7 and the main shaft 5. While the rotary piston 10 performs left - right rotary translation, it drives the main shaft 5 to rotate in the opposite direction relative to the rotary piston 10.

[0104] Relief grooves 12 are respectively provided at the middle positions on the inner sides of the axial directions of the second shaft sections 802 of the left support seal seat and the second shaft sections 902 of the right support seal seat. When the rotary piston 10 rotates and translates left and right to the extreme positions, the outer parts of the left end 1001 and the right end 1003 of the rotary piston can respectively enter the corresponding relief grooves 12. Without changing the overall axial dimension of the oscillating cylinder, it can increase the left - right rotary translation distance of the rotary piston 10, thereby increasing the amplitude of the forward and reverse swing of the main shaft 5, ultimately realizing a large - amplitude swing operation of the oscillating cylinder, and improving the application range of the oscillating cylinder.

[0105] Chamfers 23 are respectively provided between the relief grooves 12 on the left support seal seat 8 and the right support seal seat 9 and the connected outer end faces. The relief grooves 12 and the connected outer end faces are arc - transitioned through the chamfers 23.

[0106] By setting the chamfers 23, when the two ends of the rotary piston 10 gradually enter the inside of the relief grooves 12 during the operation of the oscillating cylinder, the hydraulic oil inside the relief grooves 12 can be smoothly discharged through the corresponding oil holes.

[0107] Specifically, for example, when the left - most end of the rotary piston 10 gradually rotates into the inside of the relief groove 12 on the left support seal seat 8, the lubricating oil inside the relief groove 12 gradually diffuses to the outer circumference under the centrifugal force of the rotation of the rotary piston 10. When it diffuses to the position of the chamfer 23, at this time, the chamfer 23 plays a role in guiding and directing the diffused hydraulic oil, enabling the hydraulic oil to be more smoothly drained towards the oscillating cylinder housing 1 direction. Finally, the hydraulic oil is smoothly discharged from the left oil hole 3. If the position of the chamfer 23 is set as a right angle, when the hydraulic oil diffuses to the right - angle position, part of the hydraulic oil will continue to flow axially under the action of inertia, thereby causing a reverse impact on the rotary piston 10, resulting in an increase in the resistance of the rotary piston 10 to rotate and translate. If the rotary piston 10 is affected by a large resistance for a long time, it will reduce the swing accuracy of the oscillating cylinder, thereby reducing the service life of the oscillating cylinder.

[0108] Fixed seats 2 are respectively fixedly provided at positions near both sides on the outside of the oscillating cylinder housing 1, which can facilitate the quick disassembly of the oscillating cylinder.

[0109] The left support seal seat 8 and the swing cylinder housing 1, as well as the right support seal seat 9 and the swing cylinder housing 1, are assembled and fixed tightly, which can facilitate the disassembly of the left support seal seat 8 and the right support seal seat 9. According to actual usage requirements, the left support seal seat 8 and the swing cylinder housing 1, as well as the right support seal seat 9 and the swing cylinder housing 1, can also be fixed by welding. The welding positions are respectively located on both sides of the left and right support seal seats and at the position of the shaft shoulder. Combining the axial fixed locking of the left support seal seat 8 and the right support seal seat 9 with the locking and positioning boss 10101 can ensure to the greatest extent that when the main shaft 5 rotates, the left support seal seat 8 and the right support seal seat 9 continuously maintain a stable static state.

[0110] The internal gear ring 7 and the middle section 101 of the housing are fixed by welding. The welding positions are respectively located on both sides of the internal gear ring 7. By welding and setting the welding positions on both sides of the internal gear ring 7 respectively, the impact resistance of the internal gear ring 7 can be increased, and the stable meshing rotation and translation between the rotary piston 10 and the internal gear ring 7 can be ensured permanently.

[0111] The width of the rotary support assembly 21 is 15mm ± 2mm, which can ensure that there is enough rotary support width between the left end 501 of the main shaft and the right rotary support seat 6 of the main shaft and the left section 102 and the right section 103 of the housing respectively, and provide sufficient stable rotary support strength when the main shaft 5 rotates.

[0112] The thickness from the axial outer end face of the first shaft section 50101 of the left end of the main shaft to the axial inner end face of the second shaft section 50102 of the left end of the main shaft is 26mm ± 2mm, and the thickness from the axial outer end face of the left support seal seat positioning boss 804 to the axial outermost end face of the second shaft section 802 of the left support seal seat is 20mm ± 2mm. After adding the two dimensions, it can be clearly seen that the continuous support width at the leftmost position of the main shaft 5 and the leftmost position of the swing cylinder housing 1 can reach about 50mm. This support width is sufficient to support the main shaft 5 to achieve high-intensity and large-load swing operations and realize the large torque output of the swing cylinder.

[0113] Similarly, the thickness from the axial outer end face of the right rotary support seat 6 of the main shaft to the axial inner end face of the second shaft section 602 of the right rotary support seat of the main shaft is 26mm ± 2mm, and the thickness from the axial outer end face of the right support seal seat positioning boss 904 to the axial outermost end face of the second shaft section 902 of the right support seal seat is 21mm ± 2mm.

[0114] The thickness of the middle section 101 of the housing is 11 mm ± 2 mm, and the thicknesses of the left section 102 and the right section 103 of the housing are both 6 mm ± 1 mm. By thickening the swing cylinder housing 1 as a whole, when the swing cylinder performs high-intensity and large-load swing operations, the swing cylinder housing 1 can easily withstand the high-intensity and large-load swing impacts, further ensuring that the swing cylinder can continuously and stably perform large-torque swing operations.

[0115] The thickness of the first hydraulic oil seal ring 13 is 6 mm ± 1 mm. By thickening the first hydraulic oil seal ring 13, the rotational sealing effect between the left support seal seat 8 and the right support seal seat 9 and the main shaft 5 can be further enhanced.

[0116] However, the above are only specific embodiments of the present utility model, and the scope of implementation of the present utility model 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 utility model should still fall within the scope covered by the claims of the present utility model.

Claims

1. A static seal support device for a hydraulic swing cylinder, comprising a swing cylinder housing, wherein a main shaft is arranged inside the swing cylinder housing, wherein the main shaft comprises a left end portion of the main shaft, and wherein the left end portion of the main shaft is located at a left position of the main shaft; Its characteristics are: A rotation support assembly is provided between the axially outer portion of the left end portion of the main shaft and the left inner circumference of the swing cylinder housing, and a rotation support connection is realized between the axially outer portion of the left end portion of the main shaft and the left inner circumference of the swing cylinder housing through the rotation support assembly; A left-side supporting sealing seat is provided between the axial inner part of the left end portion of the main shaft and the inner circumference of the swing cylinder housing. The outer circumference of the left-side supporting sealing seat and the swing cylinder housing are sealed and fixedly connected. The inner circumference of the left-side supporting sealing seat and the outer circumference of the axial inner part of the left end portion of the main shaft are rotationally sealed and connected.

2. The static seal support device for the hydraulic swing cylinder according to claim 1, characterized in that: The swing cylinder housing comprises a housing middle section, a housing left section, and a housing right section, wherein the housing middle section is located in the middle of the swing cylinder housing, the housing left section is located on the left side of the swing cylinder housing, and the housing right section is located on the right side of the swing cylinder housing; The inner circumference of the middle section of the shell protrudes inward to form a locking and positioning boss.

3. The static seal support device for the hydraulic swing cylinder according to claim 2, characterized in that: The left end of the main shaft is a stepped shaft structure, and the left end of the main shaft includes a first shaft section at the left end of the main shaft, a second shaft section at the left end of the main shaft, a third shaft section at the left end of the main shaft, and a fourth shaft section at the left end of the main shaft. The first shaft section at the left end of the main shaft, the second shaft section at the left end of the main shaft, the third shaft section at the left end of the main shaft, and the fourth shaft section at the left end of the main shaft are arranged adjacent to each other from the outside to the inside, and the outer diameters of the first shaft section at the left end of the main shaft, the second shaft section at the left end of the main shaft, the third shaft section at the left end of the main shaft, and the fourth shaft section at the left end of the main shaft are reduced in sequence; The rotating support assembly is located between the outer circumference of the second shaft section at the left end of the main shaft and the inner circumference of the left section of the housing, and the second shaft section at the left end of the main shaft and the left section of the housing are connected in a rotating support manner through the rotating support assembly; The left-side support sealing seat is located between the outer circumference of the fourth shaft segment at the left end of the main shaft and the inner circumference of the swing cylinder housing. The left-side support sealing seat includes a left-side support sealing seat first shaft segment and a left-side support sealing seat second shaft segment. The left-side support sealing seat first shaft segment is located at the outer side of the left-side support sealing seat, and the left-side support sealing seat second shaft segment is located at the inner side of the left-side support sealing seat.

4. The static seal support device for the hydraulic swing cylinder according to claim 3, characterized in that: The left side support seal seat is a stepped shaft structure, the outer diameter of the first shaft section of the left side support seal seat is greater than the outer diameter of the second shaft section of the left side support seal seat, a shaft shoulder is formed between the first shaft section of the left side support seal seat and the second shaft section of the left side support seal seat, and the first shaft section of the left side support seal seat is located at the radial surface position of the shaft shoulder and is axially fixedly connected to the left end surface of the locking positioning boss; The outer circumference of the second shaft section of the left support sealing seat is provided with a sealing ring fixing groove, and a second oil sealing ring is provided in the sealing ring fixing groove. The outer circumference of the second shaft section of the left support sealing seat and the leftmost position of the inner circumference of the locking positioning boss are sealed and fixedly connected through the second oil sealing ring.

5. The static seal support device for the hydraulic swing cylinder according to claim 3, characterized in that: The inner circumference of the left support sealing seat is provided with a sealing ring fixing groove, and a first oil sealing ring is provided in the sealing ring fixing groove. The inner circumference of the left support sealing seat and the outer circumference of the fourth shaft segment at the left end of the main shaft are rotationally sealed and connected via the first oil sealing ring.

6. The static seal support device for the hydraulic swing cylinder according to claim 3, characterized in that: The outermost position of the axial outer side end surface of the first shaft section of the left side support seal seat is provided with a left side support seal seat positioning boss protruding outward, and the axial outer side end surface of the left side support seal seat positioning boss is axially adjacent to the rotating support assembly; The inner circumference of the left-side support sealing seat positioning boss is located at a radially symmetrical position of the outer circumference of the third shaft segment at the left end of the main shaft, and an accommodating cavity is formed between the left-side support sealing seat positioning boss, the left-side support sealing seat first shaft segment, the third shaft segment at the left end of the main shaft, and the second shaft segment at the left end of the main shaft, and a supporting wear-resistant pad is provided in the accommodating cavity, and a rotationally supported connection is realized between the second shaft segment at the left end of the main shaft and the left-side support sealing seat through the supporting wear-resistant pad.

7. The static seal support device for the hydraulic swing cylinder according to claim 6, characterized in that: The axially outer end surface of the first shaft segment of the left-side support sealing seat is located adjacent to the inner circumference of the left-side support sealing seat positioning boss and is provided with a support wear-resistant pad placement groove; an accommodating cavity is formed between the left-side support sealing seat positioning boss, the support wear-resistant pad placement groove, the third shaft segment at the left end of the main shaft, and the second shaft segment at the left end of the main shaft; a support wear-resistant pad is provided in the accommodating cavity; the second shaft segment at the left end of the main shaft and the left-side support sealing seat are rotationally supported and connected via the support wear-resistant pad.

8. The static seal support device for a hydraulic swing cylinder according to claim 3, characterized in that: A sealing ring fixing groove is arranged on the outer circumference of the first shaft section at the left end of the main shaft, a dustproof sealing ring is arranged in the sealing ring fixing groove, and a rotary sealing connection is achieved between the first shaft section at the left end of the main shaft and the left section of the housing via the dustproof sealing ring.

9. The static seal support device for a hydraulic swing cylinder according to claim 3, characterized in that: An avoidance groove is provided at the middle position of the axial inner side of the second shaft section of the left support seal seat.

10. The static seal support device for a hydraulic swing cylinder according to claim 5, characterized in that: The thickness of the first oil sealing ring is 6 mm±1 mm.

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