Swing oil cylinder with pressure relief protection device

Abstract

The swing oil cylinder with the pressure relief protection device is provided with an outer shell, a main shaft, a left side fixing shaft sleeve and a right side fixing shaft sleeve, a piston sleeve and a rotary supporting ring are sequentially arranged between the middle portion of the main shaft and the middle portion of the outer shell from inside to outside, and an oil cavity of the swing oil cylinder is divided into a left oil cavity and a right oil cavity through the piston sleeve. The left oil cavity and the right oil cavity are communicated with two oil holes in the outer shell respectively, a left overflow hole, a right overflow hole and an overflow valve are arranged in the main shaft, one end of the left overflow hole and one end of the right overflow hole are communicated with the left oil cavity and the right oil cavity respectively, and an overflow channel is arranged in the overflow valve. Two ends of the overflow channel are respectively communicated with the other ends of the left overflow hole and the right overflow hole. The problems that in existing oil cylinder operation, due to the fact that the pressure in the cylinder is too high, an oil cylinder sealing piece is damaged, a cylinder body is broken or other mechanical faults occur are solved. 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 pressure relief protection device. BACKGROUND

[0002] The swing oil cylinder is a kind of hydraulic execution element, it has compact structure, safe and reliable, small footprint, easy to design, output torque and swing angle big and so on Advantage.

[0003] However, in the long time operation of oil cylinder, the pressure in cylinder is too high, such as due to the excessive supply of hydraulic oil, the oil pressure in cylinder is too high, and the oil cylinder is used for a long time in high temperature environment, the expansion of oil leads to the increase of pressure in cylinder, and the pressure is too high, which may exceed the design bearing range of oil cylinder, leading to the damage of oil cylinder sealing element, cylinder body rupture or other mechanical failure, and then affecting the normal work and service life of oil cylinder. UTILITY MODEL CONTENTS

[0004] The utility model provides a swing oil cylinder with pressure relief protection device for the above technical problem, when the pressure in left oil cavity or right oil cavity in oil cylinder is too high, it is relieved through pressure relief channel, avoids the damage of oil cylinder sealing element, cylinder body rupture or other mechanical failure due to the pressure in cylinder is too high, and then affects the normal work and service life of oil cylinder Technical problem.

[0005] Therefore, the technical scheme of the utility model is a swing oil cylinder with pressure relief protection device, which is provided with a shell body, a main shaft, a left side fixed shaft sleeve and a right side fixed shaft sleeve.

[0006] The left side fixed shaft sleeve is located at the left end position in the shell body, and the left side fixed shaft sleeve and the shell body are sealingly and fixedly connected.

[0007] The right side fixed shaft sleeve is located at the right side position of the shell body, the inner side part on the right side fixed shaft sleeve is located at the outermost position in the shell body, and is sealingly and fixedly connected with the shell body, and the outer side part on the right side fixed shaft sleeve is located at the axial outer side position of the shell body, and is axially fixedly connected with the shell body.

[0008] The main shaft is located in the shell body, the left side part on the main shaft is rotatably supported and connected with the left side fixed shaft sleeve, and the right side part on the main shaft is rotatably sealingly connected with the right side fixed shaft sleeve and rotatably supported and connected with the shell body from outside to inside.

[0009] The shell body, the main shaft, the left side fixed shaft sleeve and the right side fixed shaft sleeve form an oil cavity.

[0010] The intermediate portion of the main shaft and the intermediate portion of the outer shell are sequentially provided with a piston sleeve and a rotating support ring from inside to outside, and the rotating support ring is fixedly connected with the outer shell;

[0011] The inner and outer circumferences of the axial one side of the piston sleeve are respectively in meshing and rotating connection with the outer circumference of the axial one side of the main shaft and the inner circumference of the rotating support ring, and the inner and outer circumferences of the axial other side of the piston sleeve are respectively in rotating sealing connection with the outer circumference of the axial other side of the main shaft and the inner circumference of the outer shell;

[0012] The piston sleeve separates the oil cavity into a left oil cavity and a right oil cavity, and the left oil cavity and the right oil cavity are respectively communicated with two oil holes on the outer shell;

[0013] The inner portion of the main shaft is respectively provided with a left overflow hole, a right overflow hole and an overflow valve, one end of the left overflow hole and the right overflow hole is respectively communicated with the left oil cavity and the right oil cavity, and the overflow valve is provided with an overflow channel, and two ends of the overflow channel are respectively communicated with the other end of the left overflow hole and the right overflow hole.

[0014] Preferably, the left overflow hole is located at a position close to the left side in the inner portion of the main shaft, the right overflow hole is located at a position close to the right side in the inner portion of the main shaft, and an intermediate overflow hole is arranged at a position between the left overflow hole and the right overflow hole in the inner portion of the main shaft, one end of the left overflow hole far away from the left oil cavity is communicated with one end of the intermediate overflow hole, and the other end of the intermediate overflow hole is communicated with one end of the overflow channel far away from the right overflow hole;

[0015] The rightmost position of the inner portion of the main shaft is provided with an overflow valve mounting hole, and the overflow valve is fixedly arranged in the inner portion of the overflow valve mounting hole.

[0016] Preferably, the main shaft is respectively provided with a main shaft left segment, a main shaft intermediate segment and a main shaft right segment from left to right;

[0017] The right end of the left fixed shaft sleeve is provided with a groove, the main shaft left segment is located in the inner portion of the groove and is mutually fitted with the groove, so as to realize the rotating support connection between the main shaft left segment and the left fixed shaft sleeve;

[0018] The main shaft right segment is a stepped shaft structure, the main shaft right segment is respectively provided with a main shaft right segment rotating sealing segment and a main shaft right segment rotating support segment from outside to inside, the center position of the right fixed shaft sleeve is provided with a hole, the main shaft right segment rotating sealing segment is located in the inner portion of the hole, and the outer circumference of the main shaft right segment rotating sealing segment is in rotating sealing connection with the inner circumference of the hole;

[0019] The outer circumference of the main shaft right segment rotating support segment and the inner circumference of the outer shell are located at the adjacent positions on the inner side of the right fixed shaft sleeve and are in rotating support connection, and the axial outer end of the main shaft right segment rotating support segment and the axial inner end of the right fixed shaft sleeve are in rotating support connection.

[0020] Preferably, the center of the left fixed shaft sleeve is provided with a boss protruding outward, and the outer circumferential position of the outer end surface of the left fixed shaft sleeve is fixedly provided with a fixed ring, which is located at the leftmost position inside the outer shell, and the fixed ring is sealingly and fixedly connected with the inner circumferential surface of the outer shell;

[0021] The inner circumferential surface of the fixed ring and the outer circumferential surface of the boss are provided with a rotary positioning groove, and a left rotary support assembly is connected in the rotary positioning groove, the left rotary support assembly is composed of a left rotary support sleeve and a left rotary support plate, the left rotary support sleeve is sequentially provided with a left rotary support sleeve left segment and a left rotary support sleeve right segment from left to right, the left rotary support sleeve is provided with a rotary positioning hole, the left rotary support plate is provided with a through mounting hole, the left rotary support sleeve right segment can be inserted into the mounting hole, the left rotary support sleeve and the left rotary support plate are locked and fixed by the left rotary support sleeve right segment inserted into the mounting hole and screws, after the left rotary support sleeve and the left rotary support plate are locked and fixed, the front segment of the left rotary support sleeve right segment is located at the outer side of the left rotary support plate, forming a left rotary support assembly rotary connection segment, the left rotary support assembly rotary connection segment is located inside the rotary positioning groove, and the left rotary support assembly rotary connection segment is rotationally connected with the rotary positioning groove.

[0022] Preferably, the rotary positioning hole is an axial through hole.

[0023] Preferably, the axial outer side of the main shaft right segment is provided with a right rotary support plate, and the right rotary support plate and the main shaft right segment are axially locked by screws;

[0024] The right side port of the overflow valve mounting hole penetrates to the outside of the main shaft right segment, and after the right rotary support plate and the main shaft right segment are locked, the right rotary support plate and the overflow valve mounting hole are mutually attached.

[0025] Preferably, a through hole is provided on the right rotary support plate at an axial symmetrical position of the overflow valve mounting hole, a reinforcing fixed block is arranged in the through hole, an axial inner side portion of the reinforcing fixed block is located inside the overflow valve mounting hole, and an axial outer side portion of the reinforcing fixed block is located inside the hole on the right rotary support plate, so that the reinforcing fixed block is simultaneously attached and fixed with the right rotary support plate and the main shaft right segment.

[0026] Preferably, the reinforcing fixed block is detachably connected and fixed with the right rotary support plate and the main shaft right segment.

[0027] Preferably, a groove is arranged on the outer circumferential surface of the main shaft right segment rotary support segment, and a wear-resistant support pad is arranged in the groove, and the main shaft right segment rotary support segment and the inner circumferential surface of the outer shell are radially rotationally supported and connected through the wear-resistant support pad;

[0028] A wear-resistant support pad is arranged between the axial outer end of the right segment of the main shaft and the axial inner end of the right fixed shaft sleeve, and the right segment of the main shaft is axially rotatably connected with the right fixed shaft sleeve through the wear-resistant support pad;

[0029] A groove is arranged on the outer circumference of the left segment of the main shaft, a wear-resistant support pad is arranged in the groove, and the left segment of the main shaft is rotatably connected with the left fixed shaft sleeve through the wear-resistant support pad;

[0030] A plurality of grooves are arranged on the inner circumference of the right fixed shaft sleeve, and a dustproof sealing ring and an oil sealing ring are sequentially arranged in the grooves from outside to inside;

[0031] The number of the oil sealing rings is multiple.

[0032] Preferably, an adjusting gasket is arranged between the axial position of the groove on the left segment of the main shaft and the left fixed shaft sleeve.

[0033] The utility model discloses a swing cylinder, when the hydraulic oil enters left oil cavity, pushes the piston sleeve to rotate and translates to the right side, at this moment, the oil liquid will enter left side overflow hole, intermediate overflow hole and overflow passage simultaneously, because the pressure in the cavity does not reach the set pressure value of overflow valve at this moment, the overflow passage is in closed state, when the supply amount of hydraulic oil is too much, or the oil cylinder is used for a long time under high temperature environment, or the expansion of oil liquid leads to that the oil pressure in the cylinder is too high, and exceeds the set pressure value of overflow valve, the overflow passage is forced to open, and the hydraulic oil of left side overflow hole and intermediate overflow hole can enter right oil cavity through the overflow passage, and the hydraulic oil in right oil cavity continuously flows back to the hydraulic oil tank, so that the pressure relief effect is achieved, and the technical problems that the oil cylinder sealing element is damaged, the cylinder body is broken or other mechanical faults are caused due to that the oil pressure in the cavity is too high and exceeds the design bearing range of the oil cylinder, and the normal work and service life of the oil cylinder are affected are avoided.

[0034] Similarly, when the main shaft rotates in the opposite direction, the hydraulic oil enters right oil cavity, right side overflow hole and overflow passage, and when the oil pressure exceeds the set pressure value of overflow valve during the transmission of the hydraulic oil, the overflow passage is also forced to open, and the hydraulic oil can continuously flow back to the hydraulic oil tank along the hydraulic oil in left oil cavity, so that the pressure relief effect is also achieved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is the utility model perspective view;

[0036] Figure 2 It is the utility model right view;

[0037] Figure 3 It is the utility model Figure 2 A-A section view;

[0038] Figure 4 is a structure perspective view of the left side rotating support assembly after removal in the utility model;

[0039] Figure 5 is a structure exploded view of the left side rotating support assembly in the utility model;

[0040] Figure 6 is a B place enlarged view in the utility model Figure 3 .

[0041] Explanation of symbols in the figure:

[0042] 1. outer shell; 2. connecting support plate; 3. left side rotating support assembly; 301. left side rotating support sleeve; 30101. left side rotating support sleeve left section; 30102. left side rotating support sleeve right section; 30103. rotating positioning hole; 30104. left side rotating support assembly rotating connecting section; 302. left side rotating support plate; 30201. mounting hole; 4. right side rotating support plate; 5. reinforcing fixing block; 6. main shaft; 601. main shaft left section; 602. main shaft middle section; 603. main shaft right section; 60301. main shaft right section rotating sealing section; 60302. main shaft right section rotating support section; 7. piston sleeve; 8. rotating support ring; 9. fixed ring; 10. left side overflow hole; 11. right side overflow hole; 12. middle overflow hole; 13. overflow valve; 1301. first overflow port; 1302. second overflow port; 14. overflow valve mounting hole; 15. dustproof sealing ring; 16. oil sealing ring; 17. wear-resistant support pad; 18. adjusting gasket; 19. oil cavity; 1901. left oil cavity; 1902. right oil cavity; 20. left side fixed shaft sleeve; 21. right side fixed shaft sleeve; 22. rotating positioning groove; 23. boss. DETAILED DESCRIPTION

[0043] The utility model is further described below in combination with examples.

[0044] Through Figures 1-6It can be seen that the swing cylinder with pressure relief protection device is provided with an outer shell 1, a main shaft 6, a left side fixed shaft sleeve 20 and a right side fixed shaft sleeve 21. The left side fixed shaft sleeve 20 is located at the left end position inside the outer shell 1, and the outer circumference of the left side fixed shaft sleeve 20 is sealingly and fixedly connected with the inner circumference of the outer shell 1 to avoid the leakage of the oil in the cylinder to the outside along the gap. The right side fixed shaft sleeve 21 is located at the right side position of the outer shell 1, and the inner side part of the right side fixed shaft sleeve 21 is located at the outermost position inside the outer shell 1 and is sealingly and fixedly connected with the outer shell 1 to prevent the leakage of the oil. The outer side part of the right side fixed shaft sleeve 21 is located at the axial outside position of the outer shell 1 and is axially fixedly connected with the outer shell 1. The main shaft 6 is located inside the outer shell 1. The left side part of the main shaft 6 is rotatably and supportingly connected with the left side fixed shaft sleeve 20. The right side part of the main shaft 6 is rotatably and sealingly connected with the right side fixed shaft sleeve 21 from outside to inside and is rotatably and supportingly connected with the outer shell 1. Finally, the main shaft 6 is realized to rotate in the positive direction and the reverse direction inside the outer shell 1.

[0045] An oil cavity 19 is formed between the outer shell 1, the main shaft 6, the left side fixed shaft sleeve 20 and the right side fixed shaft sleeve 21, and the oil cavity 19 is used to transmit the hydraulic oil.

[0046] A piston sleeve 7 and a rotary support ring 8 are sequentially arranged between the middle part of the main shaft 6 and the middle part of the outer shell 1 from inside to outside. The rotary support ring 8 is fixedly connected with the outer shell 1. The inner and outer circumferences of the axial one side of the piston sleeve 7 are rotatably connected with the axial one side outer circumference of the middle position of the main shaft 6 and the inner circumference of the rotary support ring 8, respectively. The inner and outer circumferences of the axial other side of the piston sleeve 7 are rotatably and sealingly connected with the axial other side outer circumference of the middle position of the main shaft 6 and the inner circumference of the outer shell 1, respectively. The piston sleeve 7 separates the oil cavity 19 into a left oil cavity 1901 and a right oil cavity 1902. The left oil cavity 1901 and the right oil cavity 1902 are respectively communicated with two oil holes on the outer shell 1. The outer side oil holes of the two oil holes are respectively connected with two oil transmission ports of a hydraulic oil tank. When the swing cylinder is operated, the hydraulic oil enters the left oil cavity 1901 from the hydraulic oil tank and the left side oil hole in sequence. Under the continuous conveying action of the hydraulic oil, the hydraulic oil pushes the piston sleeve 7 to rotate and translate to the right side. The piston sleeve 7 rotates and translates to the right side, and drives the main shaft 6 to rotate in the positive direction, thereby realizing the positive rotation operation of the swing cylinder. Conversely, when the hydraulic oil enters the right oil cavity 1902 from the hydraulic oil tank and the right side oil hole in sequence, under the continuous conveying action of the hydraulic oil, the hydraulic oil pushes the piston sleeve 7 to rotate and translate to the left side. The piston sleeve 7 rotates and translates to the left side, and drives the main shaft 6 to rotate in the reverse direction. In the process of the piston sleeve 7 rotating and translating to the left side, the hydraulic oil in the left oil cavity 1901 returns to the hydraulic oil tank through the left side oil hole, thereby realizing the reverse rotation operation of the swing cylinder.

[0047] The inner part of the main shaft 6 is respectively provided with a left overflow hole 10, a right overflow hole 11 and an overflow valve 13. One end of the left overflow hole 10 and the right overflow hole 11 respectively communicates with a left oil chamber 1901 and a right oil chamber 1902. An overflow passage is arranged in the overflow valve 13, and two ends of the overflow passage respectively communicate with the other end of the left overflow hole 10 and the right overflow hole 11. The left overflow hole 10 is located at a position close to the left side in the inner part of the main shaft 6. The right overflow hole 11 is located at a position close to the right side in the inner part of the main shaft 6. An intermediate overflow hole 12 is arranged at a position between the left overflow hole 10 and the right overflow hole 11 in the inner part of the main shaft 6. One end of the left overflow hole 10 far away from the left oil chamber 1901 communicates with one end of the intermediate overflow hole 12. The other end of the intermediate overflow hole 12 communicates with one end of the overflow passage far away from the right overflow hole 11. When the oil pressure in one side of the oil chamber is too high and exceeds the set pressure value of the overflow valve 13, the overflow passage in the overflow valve 13 is opened. At this time, the hydraulic oil in the left oil chamber 1901 and the right oil chamber 1902 is forced to communicate through the left overflow hole 10, the right overflow hole 11, the intermediate overflow hole 12 and the overflow passage, so as to achieve the effect of flow pressure relief.

[0048] For example, when the hydraulic oil enters the left oil chamber 1901 and pushes the piston sleeve 7 to rotate and translate to the right side, at this time, the oil will enter the left overflow hole 10, the intermediate overflow hole 12 and the overflow passage at the same time. Since the pressure in the chamber does not reach the set pressure value of the overflow valve 13 at this time, the overflow passage is in a closed state. When the supply amount of the hydraulic oil is too much, or the oil cylinder is used for a long time in a high temperature environment, or the expansion of the oil causes the oil pressure in the cylinder to be too high and exceeds the set pressure value of the overflow valve 13, the overflow passage is forced to be opened. The hydraulic oil in the left overflow hole 10 and the intermediate overflow hole 12 will enter the right oil chamber 1902 through the overflow passage and the right overflow hole 11 in turn, and continuously flow back to the hydraulic oil tank with the hydraulic oil in the right oil chamber 1902, so as to achieve the effect of pressure relief, avoid the technical problem that the oil pressure in the chamber is too high and exceeds the design bearing range of the oil cylinder, causing damage to the oil cylinder sealing element, cylinder body rupture or other mechanical failures, and thus affecting the normal work and service life of the oil cylinder.

[0049] The rightmost position of the inner part of the main shaft 6 is provided with an overflow valve mounting hole 14, and the overflow valve 13 is fixedly arranged in the inner part of the overflow valve mounting hole 14.

[0050] For the specific connection relationship between the main shaft 6 and the adjacent components, in this patent, the main shaft 6 is provided with a main shaft left segment 601, a main shaft middle segment 602 and a main shaft right segment 603 from left to right, respectively. The right side end of the left side fixed shaft sleeve 20 is provided with a groove, the main shaft left segment 601 is located inside the groove and is in close contact with the groove, realizing the rotational support connection between the main shaft left segment 601 and the left side fixed shaft sleeve 20. The main shaft right segment 603 is a stepped shaft structure, and the main shaft right segment 603 is provided with a main shaft right segment rotating sealing segment 60301 and a main shaft right segment rotating support segment 60302 from outside to inside, respectively. The center position of the right side fixed shaft sleeve 21 is provided with a hole, the main shaft right segment rotating sealing segment 60301 is located inside the hole and is in close contact with the inner circumference of the hole, and the outer circumference of the main shaft right segment rotating sealing segment 60301 is in rotational sealing connection with the inner circumference of the hole.

[0051] The outer circumference of the main shaft right segment rotating support segment 60302 is in rotational support connection with the inner circumference of the outer shell 1 at a position adjacent to the inside of the right side fixed shaft sleeve 21, and the axial outside end of the main shaft right segment rotating support segment 60302 is in rotational support connection with the axial inside end of the right side fixed shaft sleeve 21. Since the main rotating force point of the swing oil cylinder is located at the right side of the swing cylinder, and the left side of the swing cylinder mainly plays a role in maintaining power balance, it does not have a structure form of active rotation, therefore, the radial and axial rotational support at this position can ensure the rotation accuracy and stability of the right side position when the main shaft 6 rotates.

[0052] The center position of the left side fixed shaft sleeve 20 is provided with a boss 23 protruding outward, and the outer circumference position of the outer side end surface of the left side fixed shaft sleeve 20 is fixedly provided with a fixed ring 9. The fixed ring 9 is located at the leftmost position inside the outer shell 1, and is in sealing and fixed connection with the inner circumference of the outer shell 1. The sealing connection at this position can prevent dust and impurities in the external environment from entering the cylinder through the gap between the fixed ring 9 and the outer shell 1, causing damage to related components and oil, in this patent, dustproof sealing is achieved by using a dustproof sealing ring 15.

[0053] The inner circumference of the fixed ring 9 and the outer circumference of the boss 23 are provided with a rotary positioning groove 22, and the left rotary support assembly 3 is connected in the rotary positioning groove 22. For the specific structure of the left rotary support assembly 3 and the specific connection structure of the left rotary support assembly 3 and the rotary positioning groove 22, in this patent, the left rotary support assembly 3 is composed of a left rotary support sleeve 301 and a left rotary support plate 302. The left rotary support sleeve 301 is sequentially provided with a left rotary support sleeve left segment 30101 and a left rotary support sleeve right segment 30102 from left to right. The left rotary support sleeve 301 is provided with a rotary positioning hole 30103. The left rotary support plate 302 is provided with a through mounting hole 30201. The left rotary support sleeve right segment 30102 can be inserted into the mounting hole 30201. The left rotary support sleeve 301 and the left rotary support plate 302 are locked and fixed by the left rotary support sleeve right segment 30102 inserted into the mounting hole 30201 and screws. After the left rotary support sleeve 301 and the left rotary support plate 302 are locked and fixed, the front segment of the left rotary support sleeve right segment 30102 is located outside the left rotary support plate 302, forming a left rotary support assembly rotary connection segment 30104. The left rotary support assembly rotary connection segment 30104 is located inside the rotary positioning groove 22, and the left rotary support assembly rotary connection segment 30104 is rotatably connected with the rotary positioning groove 22.

[0054] The axial outer side of the main shaft right segment 603 is provided with a right rotary support plate 4. The right rotary support plate 4 and the main shaft right segment 603 are axially locked by screws.

[0055] The right side port of the overflow valve mounting hole 14 penetrates to the outside of the main shaft right segment 603. After the right rotary support plate 4 and the main shaft right segment 603 are locked, the right rotary support plate 4 and the overflow valve mounting hole 14 are mutually attached, which can effectively protect the overflow valve 13 in the overflow valve mounting hole 14 and prevent external impurities from entering the overflow valve mounting hole 14 to damage the overflow valve 13.

[0056] The left rotary support assembly 3 is designed in a split structure, which has outstanding practicality. Since the actual operation installation form of the swing cylinder is to weld a connecting plate between the left rotary support plate 302 and the right rotary support plate 4, and then connect the output load such as a quick-change adapter, a bucket support, etc. outside the connecting plate, if the left rotary support assembly 3 adopts an integrated structure, when the left rotary support assembly 3 needs to be disassembled due to failure, the connection between the left rotary support assembly 3 and the connecting plate needs to be cut off first. However, since the left rotary support assembly 3 and the connecting plate are fixed by welding, the disassembly process is complex, and during the disassembly process, the related load devices may be damaged.

[0057] Most importantly, since the working principle of the swing cylinder is that the main shaft 6 rotates to drive the right side rotating support plate 4 to rotate synchronously, the right side rotating support plate 4 drives the left side rotating support assembly 3 to rotate synchronously under the connection of the connecting plate, the left side rotating support assembly 3 mainly functions to keep the forces on both sides of the oil cylinder balanced, and in the rotation of the left side rotating support assembly 3, the main position damaged is only the part inside the rotating positioning groove 22, and the rest of the parts rarely fail, because when the left side rotating support assembly 3 rotates, the position inevitably rubs against the rotating positioning groove 22, and after a long time of rubbing, the position will be worn to varying degrees, and long-term wear will cause a gap between the position and the rotating positioning groove 22 when rotating, thereby affecting the stability of the swing cylinder, therefore, in the present patent, the left side rotating support assembly 3 is provided in a split structure, when the left side rotating support sleeve right section 30102 is worn, only the screws between the left side rotating support sleeve 301 and the left side rotating support plate 302 need to be disassembled, and the left side rotating support sleeve 301 can be taken out for replacement, which is simple and fast, and most importantly, the connecting plate between the left side rotating support plate 302 and the right side rotating support plate 4 does not need to be disassembled, saving operation time.

[0058] For the problem of friction damage of the left side rotating support assembly 3, the main reason is that the temperature is too high during friction, therefore, in the present patent, the rotating positioning hole 30103 is an axial through hole, the rotating positioning hole 30103 is directly communicated with the outside, which can effectively reduce the temperature generated when the left side rotating support assembly 3 and the rotating positioning groove 22 rotate, thereby prolonging the service life of the left side rotating support assembly 3 and adjacent components.

[0059] The right side rotating support plate 4 is provided with a through hole at an axially symmetrical position of the overflow valve mounting hole 14, and a reinforcing fixing block 5 is arranged in the through hole, an axially inner portion of the reinforcing fixing block 5 is located inside the overflow valve mounting hole 14, and an axially outer portion of the reinforcing fixing block 5 is located inside the hole on the right side rotating support plate 4, so as to realize the mutual adhesion and fixation of the reinforcing fixing block 5, the right side rotating support plate 4 and the main shaft right section 603.

[0060] The reinforcing fixing block 5 plays an important role in the rotation of the oil cylinder, because the main rotating force point of the oil cylinder is on the right side of the swing cylinder, and the main shaft 6 and the right side rotating support plate 4 are only fixed by screws, under the action of the reverse force between the main shaft 6 and the right side rotating support plate 4, the screws are prone to loosen or even break, and in the present patent, the reinforcing fixing block 5 is arranged, which increases the firmness of the connection between the main shaft 6 and the right side rotating support plate 4 under the action, and forms a high-strength connection support between the main shaft 6 and the right side rotating support plate 4, which can greatly reduce the problems of screw loosening and breaking.

[0061] For the specific fixing mode of the reinforcing fixed block 5, in this patent, the fixing mode between the reinforcing fixed block 5 and the right side rotating support plate 4 and the main shaft right segment part 603 is detachable connection fixing, such as screw locking, buckle fixing, etc. When the overflow valve 13 needs to be replaced due to failure, only the reinforcing fixed block 5 needs to be taken out, the overflow valve 13 is taken out from the inside of the overflow valve mounting hole 14 and replaced, and after replacement, the reinforcing fixed block 5 is newly installed, which is simple and fast in operation and high in work efficiency.

[0062] The outer circumference of the main shaft right segment part rotating support segment 60302 is provided with a groove, and a wear-resistant support pad 17 is arranged in the groove. The main shaft right segment part rotating support segment 60302 and the inner circumference of the outer shell 1 are connected in radial rotary support through the wear-resistant support pad 17. The axial outer side end part of the main shaft right segment part rotating support segment 60302 and the axial inner side end part of the right side fixed shaft sleeve 21 are provided with a wear-resistant support pad 17. The main shaft right segment part rotating support segment 60302 and the right side fixed shaft sleeve 21 are connected in axial rotary support through the wear-resistant support pad 17. Since the right side of the oil cylinder is the main rotating force position, the rotary stability of this position is strictly required. Therefore, the main shaft is simultaneously supported in radial and axial directions by the wear-resistant support pad 17, which can greatly improve the accuracy of the main shaft rotation, improve the rotary reliability and stability, and minimize the shaking amplitude of the main shaft rotation.

[0063] The wear-resistant support pad 17 is made of PTFE + copper powder, phenolic cloth, wood-based, nylon and other materials with high wear resistance, high dry running characteristics, high support force, high guiding stability. By arranging the support wear pad 20, on the one hand, the relative rotation stability between the main shaft right segment part rotating support segment 60302 and the outer shell 1 and between the main shaft right segment part rotating support segment 60302 and the right side fixed shaft sleeve 21 can be improved, and on the other hand, direct friction between the main shaft right segment part rotating support segment 60302 and the outer shell 1 and between the main shaft right segment part rotating support segment 60302 and the right side fixed shaft sleeve 21 can be avoided, so as to prevent knocking and wear of the related positions and reduce the service life.

[0064] In addition, the wear-resistant support pad 17 also has good heat conduction performance, which can reduce the temperature of the surrounding parts and avoid high-temperature damage to the surrounding parts, such as high-temperature damage to the sealing ring.

[0065] The outer circumference of the main shaft left segment part 601 is provided with a groove, and a wear-resistant support pad 17 is arranged in the groove. The main shaft left segment part 601 and the left side fixed shaft sleeve 20 are connected in rotary support through the wear-resistant support pad 17. The wear-resistant support pad 17 at this position has the same support, wear resistance and temperature reduction effect.

[0066] The inner circumference of the right fixing shaft sleeve 21 is provided with a plurality of grooves, and a dustproof sealing ring 15 and an oil sealing ring 16 are sequentially arranged in the plurality of grooves from outside to inside, wherein the dustproof sealing ring 15 can block dust, powder and other foreign matters in the external environment outside the swing cylinder, so as to avoid the problem that the dust, powder and other foreign matters in the external environment enter the swing cylinder, resulting in friction and damage between related parts, and the oil sealing ring 16 can avoid the leakage of lubricating oil in the cylinder to the outside, thereby ensuring the stability of the pressure during the transmission of the hydraulic oil.

[0067] The number of the oil sealing rings 16 is multiple, and the same reason is that the right side of the oil cylinder is the main rotating force position, so the sealing performance of the position is also strictly required, therefore, by arranging a plurality of oil sealing rings 16, the sealing effect of the right side of the oil cylinder during the rotation of the main shaft can be improved, so as to avoid the problem of oil leakage at the position, thereby affecting the normal operation of the oil cylinder.

[0068] The adjusting gasket 18 is arranged between the left segment 601 of the main shaft and the axial position of the groove on the left fixing shaft sleeve 20, and the adjusting gasket 18 with a corresponding thickness is arranged according to the actual installation width requirement of the left rotating support assembly 3 and the right rotating support plate 4, so that the operation is convenient and fast, the effect is obvious, and the application range is wide.

[0069] The above is only a specific embodiment of the utility model, and cannot limit the scope of the utility model, so the replacement of equivalent components or equivalent changes and modifications made in the protection range of the utility model patent should still belong to the scope covered by the claims of the utility model.

Claims

1. A swing cylinder with pressure relief protection, characterized in that: The outer shell, the main shaft, the left side fixed shaft sleeve and the right side fixed shaft sleeve are provided. The left side fixed shaft sleeve is located at the left end position inside the outer shell, and is in sealing fixed connection with the outer shell. The right side fixed shaft sleeve is located at the right side position of the outer shell, the inner side part of the right side fixed shaft sleeve is located at the outermost position inside the outer shell, and is in sealing fixed connection with the outer shell, and the outer side part of the right side fixed shaft sleeve is located at the axial outside position of the outer shell, and is in axial fixed connection with the outer shell. The main shaft is located inside the outer shell, the left side part of the main shaft is in rotating support connection with the left side fixed shaft sleeve, and the right side part of the main shaft is in rotating sealing connection with the right side fixed shaft sleeve and rotating support connection with the outer shell from outside to inside. The outer shell, the main shaft, the left side fixed shaft sleeve and the right side fixed shaft sleeve form an oil cavity. The middle part of the main shaft and the middle part of the outer shell are sequentially provided with a piston sleeve and a rotating support ring from inside to outside. The inner and outer circumferences of the axial one side of the piston sleeve are in meshing rotating connection with the outer circumference of the axial one side of the main shaft and the inner circumference of the rotating support ring, respectively, and the inner and outer circumferences of the axial other side of the piston sleeve are in rotating sealing connection with the outer circumference of the axial other side of the main shaft and the inner circumference of the outer shell, respectively. The piston sleeve separates the oil cavity into a left oil cavity and a right oil cavity, and the left oil cavity and the right oil cavity are in communication with two oil holes on the outer shell, respectively. The inner part of the main shaft is provided with a left side overflow hole, a right side overflow hole and an overflow valve, one end of the left side overflow hole and the right side overflow hole is in communication with the left oil cavity and the right oil cavity, respectively, the overflow valve is provided with an overflow channel, and two ends of the overflow channel are in communication with the other end of the left side overflow hole and the right side overflow hole, respectively.

2. The swing cylinder with pressure relief protection device according to claim 1, characterized in that: The left side overflow hole is located at the left side position inside the main shaft, the right side overflow hole is located at the right side position inside the main shaft, and the middle overflow hole is arranged at the position between the left side overflow hole and the right side overflow hole inside the main shaft, one end of the left side overflow hole away from the left oil cavity is in communication with one end of the middle overflow hole, and the other end of the middle overflow hole is in communication with one end of the overflow channel away from the right side overflow hole. The rightmost position inside the main shaft is provided with an overflow valve mounting hole, and the overflow valve is fixedly arranged inside the overflow valve mounting hole.

3. The swing cylinder with pressure relief protection device according to claim 2, characterized in that: The main shaft is provided with a main shaft left segment, a main shaft middle segment and a main shaft right segment from left to right. The right end part of the left side fixed shaft sleeve is provided with a groove, the main shaft left segment is located inside the groove and is in close contact with the groove, so as to realize the rotating support connection between the main shaft left segment and the left side fixed shaft sleeve. The main shaft right segment is a stepped shaft structure, the main shaft right segment is provided with a main shaft right segment rotating sealing segment and a main shaft right segment rotating support segment from outside to inside, the center position of the right side fixed shaft sleeve is provided with a hole, the main shaft right segment rotating sealing segment is located inside the hole, and the outer circumference of the main shaft right segment rotating sealing segment is in rotating sealing connection with the inner circumference of the hole. The outer circumference of the main shaft right section rotation support section is rotationally supported and connected with the inner circumference of the outer shell at a position adjacent to the inner side of the right side fixed shaft sleeve, and the axial outer end of the main shaft right section rotation support section is rotationally supported and connected with the axial inner end of the right side fixed shaft sleeve.

4. The swing cylinder with pressure relief protection device according to claim 3, characterized in that: A boss protruding outward is arranged at the center position of the left side fixed shaft sleeve, and a fixed ring is fixedly arranged at the outer circumferential position of the outer end surface of the left side fixed shaft sleeve, the fixed ring being located at the leftmost position inside the outer shell, and the fixed ring being simultaneously and sealingly fixedly connected with the inner circumference of the outer shell. A rotation positioning groove is arranged between the inner circumference of the fixed ring and the outer circumference of the boss, a left side rotation support assembly is connected in the rotation positioning groove, the left side rotation support assembly being composed of a left side rotation support sleeve and a left side rotation support plate, a left side rotation support sleeve left section and a left side rotation support sleeve right section being sequentially arranged on the left side rotation support sleeve from left to right, a rotation positioning hole being arranged on the left side rotation support sleeve, a through mounting hole being arranged on the left side rotation support plate, the left side rotation support sleeve right section being insertable into the mounting hole, the left side rotation support sleeve and the left side rotation support plate being locked and fixed through the left side rotation support sleeve right section inserted into the mounting hole and screws, after the left side rotation support sleeve and the left side rotation support plate are locked and fixed, a front section of the left side rotation support sleeve right section being located at the outer side position of the left side rotation support plate to form a left side rotation support assembly rotation connection section, the left side rotation support assembly rotation connection section being located inside the rotation positioning groove, and the left side rotation support assembly rotation connection section being rotationally connected with the rotation positioning groove.

5. The swing cylinder with pressure relief protection device according to claim 4, characterized in that: The rotation positioning hole is an axial through hole.

6. The swing cylinder with pressure relief protection device according to claim 3, characterized in that: An right side rotation support plate is arranged at the axial outer side of the main shaft right section, and the right side rotation support plate and the main shaft right section are axially locked through screws; A right side port of the overflow valve mounting hole penetrates to the outside of the main shaft right section, and after the right side rotation support plate and the main shaft right section are locked, the right side rotation support plate and the overflow valve mounting hole are in close contact with each other.

7. The swing cylinder with pressure relief protection device according to claim 6, characterized in that: A through hole is arranged on the right side rotation support plate at an axial symmetrical position of the overflow valve mounting hole, a reinforcing fixed block is arranged in the through hole, an axial inner side portion of the reinforcing fixed block is located inside the overflow valve mounting hole, an axial outer side portion of the reinforcing fixed block is located inside the through hole on the right side rotation support plate, and the reinforcing fixed block is simultaneously in close contact with the right side rotation support plate and the main shaft right section.

8. The swing cylinder with pressure relief protection device according to claim 7, characterized in that: The reinforcing fixed block and the right side rotation support plate and the main shaft right section are detachably connected and fixed.

9. The swing cylinder with pressure relief protection device according to claim 3, characterized in that: A groove is arranged on the outer circumference of the main shaft right section rotation support section, a wear-resistant support pad is arranged in the groove, and the main shaft right section rotation support section and the inner circumference of the outer shell are radially rotationally supported and connected through the wear-resistant support pad; A wear-resistant support pad is arranged between the axial outer end of the main shaft right section rotation support section and the axial inner end of the right side fixed shaft sleeve, and the main shaft right section rotation support section and the right side fixed shaft sleeve are axially rotationally supported and connected through the wear-resistant support pad; The outer circumference of the left segment of the main shaft is provided with a groove, and the groove is provided with a wear-resistant supporting pad. The inner circumference of the right fixed shaft sleeve is provided with a plurality of grooves, and the grooves are sequentially provided with a dustproof sealing ring and an oil sealing ring from outside to inside. The number of the oil sealing rings is multiple.

10. The swing cylinder with pressure relief protection device according to claim 3, characterized in that: The left segment of the main shaft and the axial position of the groove on the left fixed shaft sleeve are provided with an adjusting gasket.

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