Swing oil cylinder with U-shaped sealing structure

Abstract

The utility model provides a swing oil cylinder with a U-shaped sealing structure, which is provided with a shell, a main shaft is arranged in the shell, the main shaft comprises a main shaft left shaft section and a main shaft right shaft section, the main shaft left shaft section is U-shaped and forms a surrounding structure for the left side of the shell, and a right rotating shaft sleeve is arranged on the outer circumference of the main shaft right shaft section. And the right rotating shaft sleeve is U-shaped and forms a surrounding structure for the right side of the shell, and the left shaft section of the U-shaped main shaft and the right rotating shaft sleeve are rotationally and hermetically connected with the left side and the right side of the shell respectively. According to the swing oil cylinder, the left side shaft section and the right side rotating shaft sleeve of the main shaft are arranged to be of the U-shaped structure, surrounding structures can be formed on the two sides of the shell, and the situation that connecting gaps between the outermost side of the main shaft and the rotating shaft sleeves and the two sides of the shell are exposed to the two sides of the swing oil cylinder can be avoided; and the technical problem that the dustproof sealing ring is damaged by external dust is solved, and the service life of the swing oil cylinder is prolonged. The swing oil cylinder can be widely applied to swing oil cylinders.

Description

TECHNICAL FIELD

[0001] The utility model relates to a swing oil cylinder, in particular to a swing oil cylinder with U type sealing structure. BACKGROUND

[0002] Swing oil cylinder is a kind of hydraulic device, it is mainly used to convert hydraulic energy into mechanical energy, realizes rotary motion, with simple structure, action sensitive, work reliable etc.

[0003] Because swing oil cylinder often operates in the place of severe environment, such as mining, tunnel excavation etc. The place with more dust, leading to swing oil cylinder to be covered by a large amount of dust, it is found in actual operation, the dust accumulation of swing oil cylinder's left and right side position is obviously more than the outer circumferential position of swing oil cylinder, however, in most swing oil cylinders, the connecting gap of the two ends of rotating assembly and the two ends of shell is exposed in the two side positions of swing oil cylinder, and the main shaft and the shell are only connected by a dustproof sealing ring, to realize dustproof effect, when swing oil cylinder is operated for a long time, external dust will continuously cause linear impact damage to dustproof sealing ring, finally leading to dust entering swing cylinder, causing damage to related parts in cylinder, reducing the service life of swing cylinder. SUMMARY

[0004] The utility model provides a swing oil cylinder with U type sealing structure for above technical problem, this swing oil cylinder with U type sealing structure, by being provided with U letter shape structure to the position of main shaft and shell adjacent and rotating shaft sleeve, can form surrounding structure to the both sides of shell, make the connecting gap between the outermost end of main shaft and rotating shaft sleeve and shell be located at the outer circumferential position of both sides of shell, and the opening direction all faces to the inside, can avoid the connecting gap of the two ends of rotating assembly and the two ends of shell being exposed in the two side positions of swing oil cylinder, leading to damage to dustproof sealing ring by external dust, so that dust enters swing cylinder, causes damage to related parts in cylinder, prolongs the service life of swing oil cylinder.

[0005] Therefore, the technical scheme of the utility model is a swing oil cylinder with U type sealing structure, which is provided with a shell, the inside of the shell is provided with a main shaft, the main shaft includes a main shaft left side shaft section, a main shaft middle shaft section and a main shaft right side shaft section, the main shaft left side shaft section includes a main shaft left side shaft section rotating sealing section, a main shaft left side shaft section rotating support section and a main shaft left side shaft section reinforced sealing section.

[0006] The main shaft left side shaft section rotating sealing section is located at the center position of the main shaft left side shaft section, the main shaft left side shaft section rotating support section is located at the outer circumferential position of the axial outer side of the main shaft left side shaft section rotating sealing section, and the main shaft left side shaft section reinforced sealing section is located at the axial inner side position of the radial outer side of the main shaft left side shaft section rotating support section.

[0007] The main shaft left side shaft segment rotation sealing segment, the main shaft left side shaft segment rotation support segment and the main shaft left side shaft segment strengthening sealing segment jointly form a U-shaped structure of the main shaft left side shaft segment;

[0008] The main shaft left side shaft segment rotation sealing segment is located at a left side position inside the shell, and the outer periphery of the main shaft left side shaft segment rotation sealing segment is in rotation sealing connection with the left side inner periphery of the shell;

[0009] The main shaft left side shaft segment rotation support segment is located at a left side end position of the shell, and the axial inner side end of the main shaft left side shaft segment rotation support segment is in rotation sealing connection with the left side end of the shell;

[0010] The main shaft left side shaft segment strengthening sealing segment is located at a left side outer periphery position of the shell, and the inner side end of the main shaft left side shaft segment strengthening sealing segment is in rotation sealing connection with the left side outer periphery of the shell;

[0011] The outer periphery of the main shaft right side shaft segment is provided with a right side rotation shaft sleeve, the inner periphery of the right side rotation shaft sleeve is in sealing fixed connection with the outer periphery of the main shaft right side shaft segment, the right side rotation shaft sleeve comprises a right side rotation shaft sleeve rotation sealing segment, a right side rotation shaft sleeve rotation support segment and a right side rotation shaft sleeve strengthening sealing segment, the right side rotation shaft sleeve rotation sealing segment is located at a center position of the right side rotation shaft sleeve, the right side rotation shaft sleeve rotation support segment is located at an outer periphery position axially outside the right side rotation shaft sleeve rotation sealing segment, and the right side rotation shaft sleeve strengthening sealing segment is located at an axial inner side position radially outside the right side rotation shaft sleeve rotation support segment;

[0012] The right side rotation shaft sleeve rotation sealing segment, the right side rotation shaft sleeve rotation support segment and the right side rotation shaft sleeve strengthening sealing segment jointly form a U-shaped structure of the right side rotation shaft sleeve;

[0013] The right side rotation shaft sleeve rotation sealing segment is located at a right side position inside the shell, and the outer periphery of the right side rotation shaft sleeve rotation sealing segment is in rotation sealing connection with the right side inner periphery of the shell;

[0014] The right side rotation shaft sleeve rotation support segment is located at a right side end position of the shell, and the axial inner side end of the right side rotation shaft sleeve rotation support segment is in rotation sealing connection with the right side end of the shell;

[0015] The right side rotation shaft sleeve strengthening sealing segment is located at a right side outer periphery position of the shell, and the inner side end of the right side rotation shaft sleeve strengthening sealing segment is in rotation sealing connection with the right side outer periphery of the shell.

[0016] Preferably, the axial inner side end surface of the main shaft left shaft segment rotation support segment and the outer circumferential surface of the main shaft left shaft segment rotation sealing segment are provided with a first shaft shoulder, the radial inner side position of the left side end surface of the shell is provided with a first groove, and a containing cavity is formed between the first shaft shoulder and the first groove.

[0017] The axial inner side end of the right side rotation shaft sleeve rotation support segment and the outer circumference of the right side rotation shaft sleeve rotation sealing segment are provided with a second shaft shoulder, the radial inner side position of the right side end surface of the shell is provided with a second groove, a containing cavity is formed between the second shaft shoulder and the second groove, and a wear-resistant support pad is arranged in the containing cavity.

[0018] The outer circumferences of the main shaft left shaft segment rotation sealing segment and the right side rotation shaft sleeve rotation sealing segment are respectively provided with third grooves, wear-resistant support pads are arranged in the third grooves, and the outer circumferences of the main shaft left shaft segment rotation sealing segment and the right side rotation shaft sleeve rotation sealing segment are respectively connected with the corresponding inner circumferences of the left and right sides of the shell through the wear-resistant support pads.

[0019] Preferably, the outer circumferences of the main shaft left shaft segment rotation sealing segment and the right side rotation shaft sleeve rotation sealing segment are respectively provided with fourth grooves, oil liquid sealing rings are arranged in the fourth grooves, and the outer circumferences of the main shaft left shaft segment rotation sealing segment and the right side rotation shaft sleeve rotation sealing segment are respectively connected with the corresponding inner circumferences of the left and right sides of the shell through the oil liquid sealing rings.

[0020] Preferably, the axial inner side ends of the main shaft left shaft segment rotation support segment and the right side rotation shaft sleeve rotation support segment are respectively provided with fifth grooves, dustproof sealing rings are arranged in the fifth grooves, and the axial inner side ends of the main shaft left shaft segment rotation support segment and the right side rotation shaft sleeve rotation support segment are respectively connected with the left and right side end portions of the shell through the dustproof sealing rings.

[0021] The radial inner side ends of the main shaft left shaft segment reinforced sealing segment and the right side rotation shaft sleeve reinforced sealing segment are respectively provided with sixth grooves, dustproof sealing rings are arranged in the sixth grooves, and the radial inner side ends of the main shaft left shaft segment reinforced sealing segment and the right side rotation shaft sleeve reinforced sealing segment are respectively connected with the outer circumferences of the left and right sides of the shell through the dustproof sealing rings.

[0022] The main shaft left shaft segment rotation sealing segment and the right side rotation shaft sleeve rotation sealing segment are respectively provided with third grooves, wear-resistant support pads are arranged in the third grooves, and the outer circumferences of the main shaft left shaft segment rotation sealing segment and the right side rotation shaft sleeve rotation sealing segment are respectively connected with the corresponding inner circumferences of the left and right sides of the shell through the wear-resistant support pads.

[0023] 1. By setting the U-shaped structure of the main shaft left side shaft segment and the right side rotating shaft sleeve on the left and right sides of the shell, the left and right sides of the shell can form a surrounding structure, on the one hand, it can avoid the external dust from the gap between the left and right sides of the rotating shaft sleeve and the shell into the cylinder, on the other hand, the left and right sides of the shell are formed by the left side shaft segment rotating sealing segment and the left side shaft segment reinforcing sealing segment and the right side rotating shaft sleeve rotating sealing segment and the right side rotating shaft sleeve reinforcing sealing segment. The inner and outer clamping type rotary support can increase the overall stability of the high-strength rotation of the main shaft. After a long time of high-strength rotation of the main shaft, there is no obvious gap between the left and right sides of the main shaft and the shell, and the accuracy of the swing cylinder is improved.

[0024] 2. As for the dust from the outer circumference of the shell, the outer part of the shell is a cylindrical structure, on the one hand, the dust is not easy to accumulate, on the other hand, during the operation of the swing cylinder, the dust on the outer circumference of the shell will fall along with the movement of the swing cylinder, therefore, very little dust will enter the gap between the left side shaft segment reinforcing sealing segment and the right side rotating shaft sleeve reinforcing sealing segment on both sides of the shell, which will not damage the dustproof sealing ring, so that the dust will not enter the inside of the swing cylinder, and the operation accuracy of the swing cylinder is further improved, the operation efficiency is improved, and the maintenance cost is greatly reduced, which has outstanding performance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of the utility model;

[0026] Figure 2 It is a front view of the utility model;

[0027] Figure 3 It is a sectional view of the utility model Figure 2 A-A;

[0028] Figure 4 It is a sectional view of the utility model Figure 3 B;

[0029] Figure 5 It is a sectional view of the utility model left side shaft segment structure;

[0030] Figure 6 It is a sectional view of the utility model right side rotating shaft sleeve structure;

[0031] Figure 7 It is a sectional view of the utility model left side and right side position structure.

[0032] Explanation of symbols in the figure:

[0033] 1. housing; 2. main shaft; 201. left side shaft section of main shaft; 20101. rotating sealing section of left side shaft section of main shaft; 20102. rotating support section of left side shaft section of main shaft; 20103. reinforced sealing section of left side shaft section of main shaft; 202. middle shaft section of main shaft; 203. right side shaft section of main shaft; 3. right side rotating shaft sleeve; 301. rotating sealing section of right side rotating shaft sleeve; 302. rotating support section of right side rotating shaft sleeve; 303. reinforced sealing section of right side rotating shaft sleeve; 4. wear-resistant support pad; 5. dustproof sealing ring; 6. oil sealing ring; 7. first shaft shoulder; 8. second shaft shoulder; 9. first groove; 10. second groove; 11. third groove; 12. fourth groove; 13. fifth groove; 14. sixth groove. DETAILED DESCRIPTION

[0034] The utility model will be further described below in combination with the embodiments.

[0035] Through Figure 1-Figure 7 It can be seen that the swing cylinder with the U-shaped sealing structure is provided with a housing 1, the inside of the housing 1 is provided with a main shaft 2, the main shaft 2 comprises a left side shaft section 201 of main shaft, a middle shaft section 202 of main shaft and a right side shaft section 203 of main shaft, the left side shaft section 201 of main shaft comprises a rotating sealing section 20101 of left side shaft section of main shaft, a rotating support section 20102 of left side shaft section of main shaft and a reinforced sealing section 20103 of left side shaft section of main shaft, the rotating sealing section 20101 of left side shaft section of main shaft is located at the central position of the left side shaft section 201 of main shaft, the rotating support section 20102 of left side shaft section of main shaft is located at the outer circumferential position of the axial outer side of the rotating sealing section 20101 of left side shaft section of main shaft, the reinforced sealing section 20103 of left side shaft section of main shaft is located at the axial inner side position of the radial outer side of the rotating support section 20102 of left side shaft section of main shaft, the rotating sealing section 20101 of left side shaft section of main shaft, the rotating support section 20102 of left side shaft section of main shaft and the reinforced sealing section 20103 of left side shaft section of main shaft jointly form the U-shaped structure left side shaft section 201 of main shaft, and the opening direction of the U-shaped structure left side shaft section 201 of main shaft faces the housing 1.

[0036] The rotating sealing section 20101 of left side shaft section of main shaft is located at the left side position in the inside of the housing 1, the outer circumferences between the rotating sealing section 20101 of left side shaft section of main shaft and the left side inner circumferences of the housing 1 are rotationally sealedly connected, the rotating support section 20102 of left side shaft section of main shaft is located at the left side end position of the housing 1, the axial inner side end of the rotating support section 20102 of left side shaft section of main shaft and the left side end of the housing 1 are rotationally sealedly connected, and the reinforced sealing section 20103 of left side shaft section of main shaft is located at the left side outer circumferential position of the housing 1, the inner side end of the reinforced sealing section 20103 of left side shaft section of main shaft and the left side outer circumferences of the housing 1 are rotationally sealedly connected.

[0037] The left shaft segment 201 of the main shaft of the U-shaped structure forms an enclosing structure at the left side of the shell 1. On the one hand, it can avoid the problem that in the existing swing cylinder operation process, external dust enters the cylinder from the gap between the right side rotating shaft sleeve and the shell 1, damages the dustproof sealing ring, and finally the dust enters the swing cylinder from the left side, which interferes with the normal rotation of the corresponding rotating parts in the cylinder and causes damage to the related parts in the cylinder. On the other hand, since the left shaft segment rotating sealing segment 20101 and the left shaft segment reinforcing sealing segment 20103 on the left shaft segment 201 of the main shaft form a clamping type rotating support at the inner and outer sides of the shell 1, the stability of the high-strength rotation of the main shaft 2 can be improved. After a long time of high-strength rotation of the main shaft 2, there will be no obvious gap between the left side of the main shaft 2 and the left side of the shell 1, and the accuracy of the swing of the swing cylinder is improved.

[0038] The outer circumference of the right shaft segment 203 of the main shaft is provided with a right rotating shaft sleeve 3, the inner circumference of the right rotating shaft sleeve 3 is sealingly and fixedly connected with the outer circumference of the right shaft segment 203 of the main shaft, and the right rotating shaft sleeve 3 comprises a right rotating shaft sleeve rotating sealing segment 301, a right rotating shaft sleeve rotating support segment 302 and a right rotating shaft sleeve reinforcing sealing segment 303. The right rotating shaft sleeve rotating sealing segment 301 is located at the center position of the right rotating shaft sleeve 3, the right rotating shaft sleeve rotating support segment 302 is located at the outer circumferential position axially outside the right rotating shaft sleeve rotating sealing segment 301, and the right rotating shaft sleeve reinforcing sealing segment 303 is located at the axial inner side position radially outside the right rotating shaft sleeve rotating support segment 302. The right rotating shaft sleeve rotating sealing segment 301, the right rotating shaft sleeve rotating support segment 302 and the right rotating shaft sleeve reinforcing sealing segment 303 jointly form a right rotating shaft sleeve 3 of a U-shaped structure, and the opening direction of the right rotating shaft sleeve 3 of the U-shaped structure faces the shell 1.

[0039] The right rotating shaft sleeve rotating sealing segment 301 is located at the right side inside the shell 1, and the outer circumference of the right rotating shaft sleeve rotating sealing segment 301 is in rotating sealing connection with the right side inner circumference of the shell 1. The right rotating shaft sleeve rotating support segment 302 is located at the right side end position of the shell 1, and the axial inner side end of the right rotating shaft sleeve rotating support segment 302 is in rotating sealing connection with the right side end of the shell 1. The right rotating shaft sleeve reinforcing sealing segment 303 is located at the right side outer circumferential position of the shell 1, and the inner side end of the right rotating shaft sleeve reinforcing sealing segment 303 is in rotating sealing connection with the right side outer circumference of the shell 1.

[0040] The right side rotating shaft sleeve 3 of the U-shaped structure forms an enclosing structure with the right side position of the shell 1. On the one hand, it can avoid the problem that in the operation process of the existing swing oil cylinder, external dust enters the cylinder from the gap between the right side rotating shaft sleeve and the shell 1, damages the dustproof sealing ring, and finally the dust enters the swing cylinder from the right side, which causes interference to the normal rotation of the corresponding rotating parts in the cylinder and damage to the related parts in the cylinder. On the other hand, since the right side rotating shaft sleeve rotating sealing section 301 and the right side rotating shaft sleeve reinforcing sealing section 303 on the right side rotating shaft sleeve 3 form a clamping type rotating support between the inner and outer sides of the shell 1, it can increase the stability of the high-strength rotation of the main shaft 2. After a long time of high-strength rotation of the main shaft 2, there will be no obvious gap between the right side position of the main shaft 2 and the right side position of the shell 1, and the accuracy of the swing of the swing oil cylinder is improved.

[0041] It can be seen that under the joint action of the main shaft left side shaft section 201 and the right side rotating shaft sleeve 3 of the U-shaped structure, external dust cannot enter the cylinder from the gap between the left and right side rotating shaft sleeves and the shell 1. In addition, as for the dust from the outer circumference of the shell 1, since the outer part of the shell 1 is in a cylindrical structure, on the one hand, dust is not easy to accumulate, and on the other hand, during the operation of the swing cylinder, the dust on the outer circumference of the shell 1 will fall off with the movement of the swing cylinder. Therefore, very little dust will enter the gap between the shell 1 on both sides and the main shaft left side shaft reinforcing sealing section 20103 and the right side rotating shaft sleeve reinforcing sealing section 303, which will not damage the dustproof sealing ring 5. Therefore, dust will not enter the interior of the swing cylinder, and the operation accuracy of the swing oil cylinder can be further improved, the operation efficiency is improved, the maintenance cost is greatly reduced, and the performance is outstanding.

[0042] The axial inner side end surface of the main shaft left side shaft segment rotating support segment 20102 is provided with a first shaft shoulder 7 between the outer circumferential surface of the main shaft left side shaft segment rotating sealing segment 20101, and the radially inner side position of the left side end surface of the shell 1 is provided with a first groove 9, and the first shaft shoulder 7 and the first groove 9 form an accommodation cavity, and the accommodation cavity is provided with a wear-resistant support pad 4, and the axial inner side end of the main shaft left side shaft segment rotating support segment 20102 is rotatably supported and connected with the left side end of the shell 1 through the wear-resistant support pad 4, and the axial inner side end of the right side rotating shaft sleeve rotating support segment 302 is provided with a second shaft shoulder 8 between the outer circumferential surface of the right side rotating shaft sleeve rotating sealing segment 301, and the radially inner side position of the right side end surface of the shell 1 is provided with a second groove 10, and the second shaft shoulder 8 and the second groove 10 form an accommodation cavity, and the accommodation cavity is provided with a wear-resistant support pad 4, and the right side rotating shaft sleeve rotating support segment 302 and the right side end of the shell 1 are rotatably supported and connected through the wear-resistant support pad 4, and the outer circumferences of the main shaft left side shaft segment rotating sealing segment 20101 and the right side rotating shaft sleeve rotating sealing segment 301 are respectively provided with third grooves 11, and the third grooves 11 are provided with wear-resistant support pads 4, and the outer circumferences of the main shaft left side shaft segment rotating sealing segment 20101 and the right side rotating shaft sleeve rotating sealing segment 301 are respectively rotatably supported and connected with the corresponding inner circumferences of the left and right sides of the shell 1 through the wear-resistant support pads 4.

[0043] The wear-resistant support pad 4 is made of PTFE + copper powder, phenolic cloth, wood, nylon and other materials with high wear resistance, high support force, high guiding stability, which can avoid direct friction between the main shaft 2 and the shell 1 and between the right side rotating shaft sleeve 3 and the shell 1, reduce the resistance of friction between the main shaft 2 and the shell 1 and between the right side rotating shaft sleeve 3 and the shell 1, increase the stability and smoothness of the main shaft 2 rotation, and ensure the consistency of the force on both sides of the swing cylinder when the main shaft 2 and the right side rotating shaft sleeve 3 rotate synchronously.

[0044] At the same time, the wear-resistant support pad 4 also has good heat conduction effect, which can reduce the heat generated by the friction between the main shaft 2 and the shell 1 and between the right side rotating shaft sleeve 3 and the shell 1, prolong the service life of the related swing parts, at the same time, can avoid the high temperature damage of the heat generated between the swing parts to the surrounding sealing ring, cause the aging of the sealing ring, ensure that the sealing ring always maintains excellent sealing performance.

[0045] The wear-resistant support pad 4 can also be replaced by other devices with wear-resistant support function, such as bearing.

[0046] For the sealing of the hydraulic oil inside the swing cylinder, in this patent, the outer circumferences of the left shaft segment rotating sealing segment 20101 of the main shaft and the right rotating shaft sleeve rotating sealing segment 301 are respectively provided with fourth grooves 12, and oil sealing rings 6 are arranged in the fourth grooves 12. The outer circumferences of the left shaft segment rotating sealing segment 20101 of the main shaft and the right rotating shaft sleeve rotating sealing segment 301 are respectively connected with the corresponding inner circumferences of the left and right sides of the shell 1 through the oil sealing ring 6. Since the swing cylinder operates at a high oil pressure, the oil sealing ring 6 can prevent the hydraulic oil inside the swing cylinder from leaking outward through the corresponding connecting gap, ensuring that the swing cylinder can operate stably.

[0047] For the blocking seal of the external dust of the swing cylinder, in this patent, the axial inner side ends of the left shaft segment rotating support segment 20102 of the main shaft and the right rotating shaft sleeve rotating support segment 302 are respectively provided with fifth grooves 13, and dustproof sealing rings 5 are arranged in the fifth grooves 13. The axial inner side ends of the left shaft segment rotating support segment 20102 of the main shaft and the right rotating shaft sleeve rotating support segment 302 are respectively connected with the left and right side ends of the shell 1 through the dustproof sealing ring 5. The radial inner side ends of the left shaft segment reinforcing sealing segment 20103 of the main shaft and the right rotating shaft sleeve reinforcing sealing segment 303 are respectively provided with sixth grooves 14, and dustproof sealing rings 5 are arranged in the sixth grooves 14. The radial inner side ends of the left shaft segment reinforcing sealing segment 20103 of the main shaft and the right rotating shaft sleeve reinforcing sealing segment 303 are respectively connected with the outer circumferences of the left and right sides of the shell 1 through the dustproof sealing ring 5. The dustproof sealing ring 5 can prevent dust, particles, foreign matter and other impurities in the external environment from entering the interior of the swing cylinder, causing problems such as oil passage blockage, meshing thread tooth damage, increased operating noise, etc., ensuring the stability of the swing cylinder operation and increasing the service life of the internal components of the swing cylinder.

[0048] By arranging two dustproof sealing rings 5 on both sides of the swing cylinder, and arranging the two dustproof sealing rings 5 at the axial side position and the radial side position of the shell 1, the dustproof effect of the swing cylinder can be further improved. When the radial side dustproof sealing ring 5 of the shell 1 is damaged due to operation error or other uncertain factors, the axial side dustproof sealing ring 5 of the shell 1 can still play a dustproof effect. More importantly, since the left shaft segment 201 of the main shaft and the right rotating shaft sleeve 3 are in a U-shaped structure, the moving speed of the dust contacting the axial side dustproof sealing ring 5 of the shell 1 is reduced. When the dust moves in the gap between the shell 1 and the left shaft segment reinforcing sealing segment 20103 of the main shaft and the right rotating shaft sleeve reinforcing sealing segment 303, it will be affected by the swing of the swing cylinder and continuously discharged outward, thereby reducing the number of dust contacting the axial side dustproof sealing ring 5 of the shell 1, so that the swing cylinder can still operate normally for a long time, further reducing maintenance costs.

[0049] The above is only a specific embodiment of the present application, and cannot limit the scope of the present application. The replacement of equivalent components or equivalent changes and modifications within the scope of the present application should still be within the scope of the present application.

Claims

1. A swing cylinder with a U-shaped sealing structure, characterized by: A housing is provided, wherein a main shaft is provided inside the housing, wherein the main shaft comprises a left main shaft section, an intermediate main shaft section, and a right main shaft section, wherein the left main shaft section comprises a left main shaft section rotating sealing section, a left main shaft section rotating supporting section, and a left main shaft section reinforcing sealing section; The main shaft left side shaft section rotating seal section is located at the center position of the main shaft left side shaft section, the main shaft left side shaft section rotating support section is located at the outer circumference position of the axial outside of the main shaft left side shaft section rotating seal section, and the main shaft left side shaft section reinforced seal section is located at the axial inside position of the radial outside of the main shaft left side shaft section rotating support section; The main shaft left side shaft section rotating seal section, the main shaft left side shaft section rotating support section, and the main shaft left side shaft section reinforcing seal section together form a main shaft left side shaft section with a U-shaped structure; The rotating seal section of the left side shaft section of the main shaft is located at the left side of the interior of the housing, and the outer circumference of the rotating seal section of the left side shaft section of the main shaft is connected to the left inner circumference of the housing in a rotating sealing manner; The left side shaft section rotation support section of the main shaft is located at the left end of the housing, and the axial inner end of the left side shaft section rotation support section of the main shaft is rotationally sealed to the left end of the housing; The reinforced sealing section of the left side shaft section of the main shaft is located at the left outer circumference of the housing, and the inner end of the reinforced sealing section of the left side shaft section of the main shaft is connected to the left outer circumference of the housing in a rotating sealing manner; The outer circumference of the right side shaft section of the main shaft is provided with a right side rotating sleeve, the inner circumference of the right side rotating sleeve is sealed and fixedly connected to the outer circumference of the right side shaft section of the main shaft, the right side rotating sleeve includes a right side rotating sleeve rotating sealing section, a right side rotating sleeve rotating support section, and a right side rotating sleeve reinforced sealing section, the right side rotating sleeve rotating sealing section is located at the center position of the right side rotating sleeve, the right side rotating sleeve rotating support section is located at the outer circumference position axially outside the right side rotating sleeve rotating sealing section, and the right side rotating sleeve reinforced sealing section is located at the axial inside position radially outside the right side rotating sleeve rotating support section; The right rotating sleeve rotating sealing section, the right rotating sleeve rotating support section, and the right rotating sleeve reinforcing sealing section together form a right rotating sleeve with a U-shaped structure; The right rotating shaft sleeve rotating seal section is located at the right side of the interior of the housing, and the outer circumference of the right rotating shaft sleeve rotating seal section is connected to the right inner circumference of the housing in a rotating sealing manner; The right rotating sleeve rotating support section is located at the right end of the housing, and the axial inner end of the right rotating sleeve rotating support section is connected to the right end of the housing in a rotating sealing manner; The right side rotating sleeve reinforced sealing section is located on the right side outer circumference of the shell, and the inner end of the right side rotating sleeve reinforced sealing section is rotationally sealed to the right side outer circumference of the shell.

2. The swing cylinder with a U-shaped sealing structure according to claim 1, characterized in that: A first shaft shoulder is provided between the axial inner end surface of the rotating support section of the left shaft section of the main shaft and the outer circumferential surface of the rotating sealing section of the left shaft section of the main shaft, a first groove is provided at the radial inner position of the left end surface of the shell, an accommodating cavity is formed between the first shaft shoulder and the first groove, a wear-resistant support pad is provided in the accommodating cavity, and the axial inner end portion of the rotating support section of the left shaft section of the main shaft and the left end portion of the shell are rotatably supported and connected via the wear-resistant support pad; A second shaft shoulder is provided between the axial inner end portion of the right rotating shaft sleeve rotating support section and the outer circumference of the right rotating shaft sleeve rotating sealing section, a second groove is provided at the radial inner position of the right end surface of the housing, an accommodating cavity is formed between the second shaft shoulder and the second groove, a wear-resistant support pad is provided in the accommodating cavity, and the right rotating shaft sleeve rotating support section and the right end portion of the housing are rotationally supported and connected via the wear-resistant support pad; The outer circumferences of the rotating sealing section of the left side of the main shaft and the rotating sleeve rotating sealing section of the right side are respectively provided with a third groove, and a wear-resistant support pad is provided in the third groove. The outer circumferences of the rotating sealing section of the left side of the main shaft and the rotating sleeve rotating sealing section of the right side are respectively connected to the corresponding inner circumferences on the left and right sides of the shell through wear-resistant support pads.

3. The swing cylinder with a U-shaped sealing structure according to claim 1, characterized in that: The outer circumferences of the left-side rotating seal section of the main shaft and the right-side rotating sleeve rotating seal section are respectively provided with fourth grooves, and oil sealing rings are provided in the fourth grooves. The outer circumferences of the left-side rotating seal section of the main shaft and the right-side rotating sleeve rotating seal section are respectively connected to the corresponding inner circumferences on the left and right sides of the shell through oil sealing rings.

4. The swing cylinder with a U-shaped sealing structure according to claim 1, characterized in that: A fifth groove is respectively provided at the axial inner end portion of the left shaft section rotation support section and the right rotating shaft sleeve rotation support section, and a dustproof sealing ring is provided in the fifth groove. The axial inner end portion of the left shaft section rotation support section and the right rotating shaft sleeve rotation support section are respectively connected to the left and right side ends of the housing through the dustproof sealing ring; The radial inner ends of the left-side main shaft reinforced sealing section and the right-side rotating sleeve reinforced sealing section are respectively provided with a sixth groove, and a dustproof sealing ring is provided in the sixth groove. The radial inner ends of the left-side main shaft reinforced sealing section and the right-side rotating sleeve reinforced sealing section are respectively connected to the outer circumference of the left and right sides of the shell through dustproof sealing rings for rotational sealing.

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