阅读说明：本技术 一种液压系统用管接头 (Pipe joint for hydraulic system ) 是由 陆胂娟 于 2021-09-03 设计创作，主要内容包括：本发明涉及管接头领域,具体的说是一种液压系统用管接头,包括管筒、硬管、波纹管、软管、缓冲锁紧机构、冷却机构,所述管筒的内部固定连接有硬管,硬管的一端固定连接有波纹管,硬管的另一端固定连接有软管,波纹管远离硬管的一端固定连接有接头座,接头座与管筒之间安装有缓冲锁紧机构,管筒的外壁上安装有冷却机构。所述缓冲锁紧机构包括锁爪、滑块、第一弹簧、钢索、变向轮。通过设置缓冲锁紧机构,有利于降低液压系统刚启动时的冲击力,防止油管发生脱落,提高管接头的安全性能。通过设置冷却机构,有利于对液压油进行降温,以保证液压系统能够稳定运行。(The invention relates to the field of pipe joints, in particular to a pipe joint for a hydraulic system, which comprises a pipe barrel, a hard pipe, a corrugated pipe, a hose, a buffering and locking mechanism and a cooling mechanism, wherein the hard pipe is fixedly connected inside the pipe barrel, the corrugated pipe is fixedly connected at one end of the hard pipe, the hose is fixedly connected at the other end of the hard pipe, a joint seat is fixedly connected at one end of the corrugated pipe, which is far away from the hard pipe, a buffering and locking mechanism is installed between the joint seat and the pipe barrel, and the cooling mechanism is installed on the outer wall of the pipe barrel. The buffering locking mechanism comprises a locking claw, a sliding block, a first spring, a steel cable and a turning wheel. Through setting up buffering locking mechanism, be favorable to reducing the impact force when hydraulic system just starts, prevent that oil pipe from taking place to drop, improve the security performance of coupling. Through setting up cooling body, be favorable to cooling down hydraulic oil to guarantee that hydraulic system can steady operation.)

1. A pipe joint for a hydraulic system is characterized in that: the cooling device comprises a pipe barrel (1), a hard pipe (2), a corrugated pipe (4), a hose (5), a buffering locking mechanism and a cooling mechanism, wherein the hard pipe (2) is fixedly connected inside the pipe barrel (1), the corrugated pipe (4) is fixedly connected at one end of the hard pipe (2), the hose (5) is fixedly connected at the other end of the hard pipe (2), a joint seat (6) is fixedly connected at one end, far away from the hard pipe (2), of the corrugated pipe (4), the buffering locking mechanism is installed between the joint seat (6) and the pipe barrel (1), and the cooling mechanism is installed on the outer wall of the pipe barrel (1);

the buffer locking mechanism comprises locking claws (7), a sliding block (8), a first spring (9), a steel cable (10) and a turning wheel (11), wherein one side of the joint seat (6) far away from the corrugated pipe (4) is connected with a plurality of locking claws (7) in a sliding manner, the locking claws (7) are uniformly arranged along the circumferential direction of the joint seat (6), the locking claws (7) are close to the outer edge of the joint seat (6), one end of the locking claws (7) inserted in the joint seat (6) is fixedly connected with the sliding block (8), the sliding block (8) is connected with the inner wall of the joint seat (6) in a sliding manner, the top end of the sliding block (8) is fixedly connected with the first spring (9), the top end of the first spring (9) is fixedly connected with the inner wall of the joint seat (6), the lower part of the joint seat (6) close to the sliding block (8) is rotatably connected with the turning wheel (11), and the bottom end of the sliding block (8) is fixedly connected with one end of the steel cable (10), the other end of the steel cable (10) passes around the turning wheel (11) and is fixedly connected with the end part of the pipe barrel (1).

2. The pipe joint for a hydraulic system according to claim 1, wherein: one side of the joint seat (6) close to the pipe barrel (1) is fixedly connected with a sliding ring (12), one end of the sliding ring (12) far away from the joint seat (6) is inserted into the end part of the pipe barrel (1), and a second spring (13) is fixedly connected between the end part of the sliding ring (12) and the end part of the pipe barrel (1).

3. The pipe joint for a hydraulic system according to claim 1, wherein: the cooling mechanism comprises a cooling cavity (14), a through hole (15), a heat dissipation water bag (16), a piston rod (17), a piston cylinder (18) and a guide pipe (19), the cooling cavity (14) is arranged in the pipe cylinder (1) at the position close to the outer wall of the hard pipe (2), and the heat dissipation water bag (16) is fixedly connected to the outer wall of the pipe cylinder (1).

4. A pipe joint for a hydraulic system according to claim 3, wherein: the outer wall of the heat dissipation water bag (16) is corrugated, and a plurality of through holes (15) are arranged between the heat dissipation water bag (16) and the cooling cavity (14) in a penetrating manner.

5. The pipe joint for a hydraulic system according to claim 4, wherein: a piston cylinder (18) is fixedly connected between the joint seat (6) and the heat dissipation water bag (16) on the outer wall of the pipe barrel (1), a guide pipe (19) is connected between the piston cylinder (18) and the heat dissipation water bag (16) in a penetrating mode, a piston rod (17) is fixedly connected to one side, close to the piston cylinder (18), of the joint seat (6), and one end, far away from the joint seat (6), of the piston rod (17) is inserted into the piston cylinder (18).

6. The pipe joint for a hydraulic system according to claim 1, wherein: the outer wall of the hose (5) is fixedly connected with a deflection ring (20), a plurality of third springs (21) are fixedly connected between the outer wall of the deflection ring (20) and the inner wall of the pipe barrel (1), and one end, far away from the pipe barrel (1), of the deflection ring (20) is in threaded connection with a nut (22).

7. The pipe joint for a hydraulic system according to claim 4, wherein: the two ends of the hard tube (2) are fixedly connected with sealing check rings (3), and the two sealing check rings (3) are respectively positioned at the two ends of the cooling cavity (14).

8. The pipe joint for a hydraulic system according to claim 1, wherein: an oil pipe (23) is inserted into one end, close to the joint seat (6), of the corrugated pipe (4), a threaded ring (24) is fixedly connected to the outer wall of the oil pipe (23), the threaded ring (24) is in threaded connection with the joint seat (6), and a sealing ring (25) is fixedly arranged at one end, close to the corrugated pipe (4), of the threaded ring (24).

9. The pipe joint for a hydraulic system according to claim 1, wherein: the locking claw (7) is L-shaped, and the locking claw (7) is matched with the end part of the thread ring (24).

10. The pipe joint for a hydraulic system according to claim 2, wherein: the section of the steel cable (10) positioned outside the joint seat (6) penetrates through the sliding ring (12).

Technical Field

The invention relates to the field of pipe joints, in particular to a pipe joint for a hydraulic system.

Background

The hydraulic pipe joint is a part for connecting a high-pressure oil pipe in a hydraulic system. The hydraulic pipe joint can be divided into a hydraulic hose, a high-pressure ball valve, a quick joint, a ferrule type pipe joint, a welded type pipe joint, a high-pressure hose and the like.

When a hydraulic system operates, hydraulic oil enters an oil pipe through a pipe joint, and the impact force of the hydraulic oil on the oil pipe is large when the hydraulic system is just started, so that the joint of a high-pressure oil pipe and the pipe joint is easy to loosen after the existing hydraulic pipe joint is used for a long time.

Disclosure of Invention

The invention aims to provide a pipe joint for a hydraulic system, which solves the problem that the joint of a high-pressure oil pipe and the pipe joint is easy to loosen after the existing hydraulic pipe joint is used for a long time.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a coupling for hydraulic system, includes bobbin, hard tube, bellows, hose, buffering locking mechanism, cooling body, the inside fixedly connected with hard tube of bobbin, the one end fixedly connected with bellows of hard tube, the other end fixedly connected with hose of hard tube, the one end fixedly connected with joint socket that the hard tube was kept away from to the bellows, installs buffering locking mechanism between joint socket and the bobbin, installs cooling body on the outer wall of bobbin.

The buffering locking mechanism comprises locking claws, a sliding block, a first spring, a steel cable and a turning wheel, wherein one side of the corrugated pipe, which is far away from the joint seat, is connected with a plurality of locking claws in a sliding mode, the locking claws are evenly arranged along the circumferential direction of the joint seat, the locking claws are close to the outer edge of the joint seat, the locking claws are connected with the sliding block fixedly connected with the one end inside the joint seat in an inserted mode, the sliding block is connected with the inner wall of the joint seat in a sliding mode, the top end of the sliding block is fixedly connected with the first spring, the top end of the first spring is fixedly connected with the inner wall of the joint seat, the turning wheel is rotatably connected with the inside of the joint seat below the sliding block, the bottom end of the sliding block is fixedly connected with one end of the steel cable, and the other end of the steel cable is wound around the turning wheel and fixedly connected with the end of the pipe barrel.

Preferably, one side of the joint seat close to the pipe barrel is fixedly connected with a sliding ring, one end of the sliding ring far away from the joint seat is inserted into the end part of the pipe barrel, and a second spring is fixedly connected between the end part of the sliding ring and the end part of the pipe barrel.

Preferably, the cooling mechanism comprises a cooling cavity, a through hole, a heat dissipation water bag, a piston rod, a piston cylinder and a conduit, the cooling cavity is arranged in the pipe cylinder and close to the outer wall of the hard pipe, and the heat dissipation water bag is fixedly connected to the outer wall of the pipe cylinder.

Preferably, the outer wall of the heat dissipation water bag is corrugated, and a plurality of through holes are arranged between the heat dissipation water bag and the cooling cavity in a penetrating manner.

Preferably, a piston cylinder is fixedly connected between the joint seat and the heat dissipation water bag on the outer wall of the pipe barrel, a guide pipe is connected between the piston cylinder and the heat dissipation water bag in a penetrating manner, a piston rod is fixedly connected to one side, close to the piston cylinder, of the joint seat, and one end, far away from the joint seat, of the piston rod is inserted into the piston cylinder.

Preferably, the outer wall of the hose is fixedly connected with a deflection ring, a plurality of third springs are fixedly connected between the outer wall of the deflection ring and the inner wall of the pipe barrel, and one end, far away from the pipe barrel, of the deflection ring is in threaded connection with a nut.

Preferably, both ends of the hard tube are fixedly connected with sealing check rings respectively, and the two sealing check rings are respectively positioned at both ends of the cooling cavity.

Preferably, an oil pipe is inserted into one end, close to the joint seat, of the corrugated pipe, a threaded ring is fixedly connected to the outer wall of the oil pipe, the threaded ring is in threaded connection with the joint seat, and a sealing ring is fixedly arranged at one end, close to the corrugated pipe, of the threaded ring.

Preferably, the locking claw is L-shaped, and the locking claw is matched with the end part of the thread ring.

Preferably, a section of the cable located outside the joint base extends through the sliding collar.

The invention has the beneficial effects that:

1. through setting up buffering locking mechanism, be favorable to reducing the impact force when hydraulic system just starts, prevent that oil pipe from taking place to drop, improve the security performance of coupling. The impact force when hydraulic oil just got into oil pipe is great, and the bellows can extend so that offset the impact force that partly hydraulic oil brought to after the bellows extension, the slider drives the locking claw and moves to the position that is close to the fillet of screw tip, and the tip joint of final locking claw and fillet of screw is in the same place, because the locking claw is the L type, so it can prevent that the fillet of screw from moving to the direction of keeping away from the joint seat, locks the fillet of screw, prevents fillet of screw and oil pipe and joint seat separation.

2. Through setting up cooling body, be favorable to cooling down hydraulic oil to guarantee that hydraulic system can steady operation. When the hydraulic oil flows through the hard tube, the condensed water absorbs the heat of a part of hydraulic oil through the outer wall of the hard tube so as to achieve the effect of reducing the oil temperature. When the hydraulic system is restarted, the joint seat is far away from the pipe barrel, the condensate water with high temperature in the cooling cavity enters the heat dissipation water bag and is mixed with the condensate water with low temperature in the heat dissipation water bag to reduce the temperature of the heat dissipation water bag, when the hydraulic system stably runs, part of mixed cool condensate water in the heat dissipation water bag enters the cooling cavity to continue cooling the hydraulic oil, and therefore the cooling mechanism can continuously cool the hydraulic oil.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a front sectional view of fig. 1.

FIG. 3 is an enlarged view of the portion A of FIG. 2 according to the present invention.

FIG. 4 is an enlarged view of the portion B of FIG. 2 according to the present invention.

FIG. 5 is an enlarged view of the portion C of FIG. 2 according to the present invention.

In the figure: 1. a tube barrel; 2. a hard tube; 3. a sealing retainer ring; 4. a bellows; 5. a hose; 6. a joint base; 7. a locking claw; 8. a slider; 9. a first spring; 10. a steel cord; 11. a turning wheel; 12. sliding a loop; 13. a second spring; 14. a cooling chamber; 15. a through hole; 16. a heat-dissipating water bag; 17. a piston rod; 18. a piston cylinder; 19. a conduit; 20. an offset ring; 21. a third spring; 22. a nut; 23. an oil pipe; 24. a thread ring; 25. and (5) sealing rings.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 5, the pipe joint for a hydraulic system according to the present invention includes a pipe barrel 1, a hard pipe 2, a bellows 4, a hose 5, a buffering locking mechanism, and a cooling mechanism, wherein the hard pipe 2 is fixedly connected inside the pipe barrel 1, the bellows 4 is fixedly connected to one end of the hard pipe 2, the hose 5 is fixedly connected to the other end of the hard pipe 2, a joint seat 6 is fixedly connected to one end of the bellows 4 away from the hard pipe 2, the buffering locking mechanism is installed between the joint seat 6 and the pipe barrel 1, the cooling mechanism is installed on an outer wall of the pipe barrel 1, a deflection ring 20 is fixedly connected to an outer wall of the hose 5, a plurality of third springs 21 are fixedly connected between an outer wall of the deflection ring 20 and an inner wall of the pipe barrel 1, and a nut 22 is threadedly connected to one end of the deflection ring 20 away from the pipe barrel 1. An oil pipe 23 is inserted into one end, close to the joint seat 6, of the corrugated pipe 4, a threaded ring 24 is fixedly connected to the outer wall of the oil pipe 23, the threaded ring 24 is in threaded connection with the joint seat 6, and a sealing ring 25 is fixedly arranged at one end, close to the corrugated pipe 4, of the threaded ring 24. When the corrugated pipe joint is used, the hose 5 is inserted into an oil outlet of an oil tank, the hose 5 and the offset ring 20 are fixed through the nut 22, the oil pipe 23 is inserted into the corrugated pipe 4, and the oil pipe 23 and the joint seat 6 are fixed through the threaded ring 24. The hose 5 can be offset relative to the hard pipe 2, so that the pipe joint can be offset relative to the oil outlet of the oil tank, and compared with the mode of directly fixing the pipe joint and the oil outlet, the connecting mode can reduce the abrasion of the pipe joint and prolong the service life of the pipe joint. When the hydraulic system operates, hydraulic oil enters the hose 5 from the oil tank, sequentially passes through the hard tube 2 and the corrugated tube 4 from the hose 5, and finally flows away from the oil pipe 23, the impact force of the hydraulic oil just entering the oil pipe 23 is large, and the buffer locking mechanism operates at the moment.

The buffering locking mechanism comprises a locking claw 7, a sliding block 8, a first spring 9, a steel cable 10 and a turning wheel 11, one side of the joint seat 6, which is far away from the corrugated pipe 4, is connected with a plurality of locking claws 7 in a sliding mode, the locking claws 7 are uniformly arranged along the circumferential direction of the joint seat 6, the locking claws 7 are close to the outer edge of the joint seat 6, the locking claws 7 are inserted into one end of the joint seat 6 and fixedly connected with the sliding block 8, the sliding block 8 is connected with the inner wall of the joint seat 6 in a sliding mode, the top end of the sliding block 8 is fixedly connected with the first spring 9, the top end of the first spring 9 is fixedly connected with the inner wall of the joint seat 6, the inside of the joint seat 6 is rotatably connected with the turning wheel 11 at the position close to the lower portion of the sliding block 8, the bottom end of the sliding block 8 is fixedly connected with one end of the steel cable 10, and the other end of the steel cable 10 bypasses the wheel 11 and is fixedly connected with the turning end portion of the pipe barrel 1. When hydraulic oil gets into bellows 4 from hard tube 2, because the scalable characteristic of bellows 4, bellows 4 can extend so that offset the impact force that a part of hydraulic oil brought, when bellows 4 extends, joint seat 6 can keep away from the bobbin 1, make the tip of bobbin 1 pull cable 10, after cable 10 turned through diversion wheel 11, pull slider 8 and move to the direction that is close to diversion wheel 11, slider 8 stretches first spring 9 in the removal in-process, and slider 8 drives locking claw 7 and moves to the position that is close to the end of thread circle 24, locking claw 7 and the tip joint of thread circle 24 are in the same place finally, because locking claw 7 is the L type, so it can prevent that thread circle 24 from moving to the direction of keeping away from joint seat 6, prevent that thread circle 24 and oil pipe 23 from separating with joint seat 6, improve the security performance of coupling.

As a technical optimization scheme of the invention, one side of the joint seat 6 close to the pipe barrel 1 is fixedly connected with a sliding ring 12, one end of the sliding ring 12 far away from the joint seat 6 is inserted into the end part of the pipe barrel 1, and a second spring 13 is fixedly connected between the end part of the sliding ring 12 and the end part of the pipe barrel 1. When the corrugated pipe 4 extends and the joint seat 6 and the pipe barrel 1 are far away from each other, the joint seat 6 drives the sliding ring 12 to move towards the direction far away from the pipe barrel 1, the sliding ring 12 compresses the second spring 13, after hydraulic oil flows in the hard pipe 2 and the corrugated pipe 4 for a period of time, the impact force of the hydraulic oil is reduced and tends to be stable, at the moment, the sliding ring 12 drives the joint seat 6 to move towards the direction close to the pipe barrel 1 through the elastic action of the second spring 13, the corrugated pipe 4 is shortened, the first spring 9 pulls the sliding block 8 to move towards the direction far away from the turning wheel 11, and the sliding block 8 drives the locking claw 7 to move away from the end part of the thread ring 24. Through setting up sliding ring 12, be favorable to protecting bellows 4, prevent that it from receiving the impact of external environment to take place to break to sliding ring 12 and second spring 13 can help bellows 4 to shorten and reset, even bellows 4 fracture, joint holder 6 still is connected with barrel 1 through sliding ring 12, avoids joint holder 6 and barrel 1 separation to cause the incident.

As a technical optimization scheme of the invention, the cooling mechanism comprises a cooling cavity 14, a through hole 15, a heat dissipation water bag 16, a piston rod 17, a piston cylinder 18 and a guide pipe 19, the cooling cavity 14 is arranged in the pipe barrel 1 at a position close to the outer wall of the hard pipe 2, and the heat dissipation water bag 16 is fixedly connected to the outer wall of the pipe barrel 1.

As a technical optimization scheme of the invention, the outer wall of the heat dissipation water bag 16 is corrugated, and a plurality of through holes 15 are arranged between the heat dissipation water bag 16 and the cooling cavity 14 in a penetrating manner.

As a technical optimization scheme of the invention, a piston cylinder 18 is fixedly connected between a joint seat 6 and a heat-dissipation water bag 16 on the outer wall of the pipe barrel 1, a guide pipe 19 is connected between the piston cylinder 18 and the heat-dissipation water bag 16 in a penetrating manner, a piston rod 17 is fixedly connected to one side of the joint seat 6 close to the piston cylinder 18, and one end of the piston rod 17 far away from the joint seat 6 is inserted into the piston cylinder 18. When the hydraulic system runs for a long time, the oil temperature of the hydraulic oil can be increased, the stable running of the hydraulic system is not facilitated due to the fact that the oil temperature of the hydraulic oil is too high, and the cooling mechanism is helpful for reducing the oil temperature of the hydraulic oil. The cooling chamber 14 and the heat dissipation water bag 16 are filled with condensed water, and when the hydraulic oil flows through the hard tube 2, the condensed water absorbs a part of heat of the hydraulic oil through the outer wall of the hard tube 2, so as to achieve the effect of reducing the oil temperature. However, when the amount of heat absorbed by the condensed water is too much, the temperature of the condensed water itself will also rise, so when the hydraulic system is restarted, the joint seat 6 is far away from the pipe barrel 1, the joint seat 6 pulls the piston rod 17, the piston rod 17 moves in the direction far away from the piston barrel 18, a part of the condensed water inside the heat dissipation water bag 16 enters the piston barrel 18, the condensed water with higher temperature in the cooling cavity 14 enters the heat dissipation water bag 16 and mixes with the condensed water with lower temperature in the heat dissipation water bag 16 to reduce the temperature of the condensed water, when the hydraulic system runs stably, the joint seat 6 moves in the direction close to the pipe barrel 1, the piston rod 17 pushes the condensed water in the piston barrel 18 to enter the heat dissipation water bag 16, and a part of the mixed condensed water in the heat dissipation water bag 16 enters the cooling cavity 14 to continue cooling the hydraulic oil. The corrugated outer wall of the heat dissipation water bag 16 can accelerate the heat dissipation of the condensed water.

As a technical optimization scheme of the invention, two ends of the hard tube 2 are fixedly connected with the sealing check rings 3, and the two sealing check rings 3 are respectively positioned at two ends of the cooling cavity 14. The sealing retainer ring 3 can prevent the condensed water in the cooling cavity 14 from leaking.

As a technical optimization scheme of the invention, the locking claw 7 is L-shaped, and the locking claw 7 is matched with the end part of the thread ring 24.

As a technical optimization of the invention, a section of the steel cable 10 located outside the joint base 6 passes through the sliding ring 12. The slip ring 12 protects the wire rope 10 from being crushed by the wire rope 10.

The working principle is as follows: when the corrugated pipe joint is used, the hose 5 is inserted into an oil outlet of an oil tank, the hose 5 and the offset ring 20 are fixed through the nut 22, the oil pipe 23 is inserted into the corrugated pipe 4, and the oil pipe 23 and the joint seat 6 are fixed through the threaded ring 24. The hose 5 can be offset relative to the hard pipe 2, so that the pipe joint can be offset relative to the oil outlet of the oil tank, and compared with the mode of directly fixing the pipe joint and the oil outlet, the connecting mode can reduce the abrasion of the pipe joint and prolong the service life of the pipe joint. When the hydraulic system operates, hydraulic oil enters the hose 5 from the oil tank, sequentially passes through the hard tube 2 and the corrugated tube 4 from the hose 5, and finally flows away from the oil pipe 23, the impact force of the hydraulic oil just entering the oil pipe 23 is large, and the buffer locking mechanism operates at the moment.

The working process of the buffering locking mechanism is as follows: when hydraulic oil gets into bellows 4 from hard tube 2, because the scalable characteristic of bellows 4, bellows 4 can extend so that offset the impact force that a part of hydraulic oil brought, when bellows 4 extends, joint seat 6 can keep away from the bobbin 1, make the tip of bobbin 1 pull cable 10, after cable 10 turned through diversion wheel 11, pull slider 8 and move to the direction that is close to diversion wheel 11, slider 8 stretches first spring 9 in the removal in-process, and slider 8 drives locking claw 7 and moves to the position that is close to the end of thread circle 24, locking claw 7 and the tip joint of thread circle 24 are in the same place finally, because locking claw 7 is the L type, so it can prevent that thread circle 24 from moving to the direction of keeping away from joint seat 6, prevent that thread circle 24 and oil pipe 23 from separating with joint seat 6, improve the security performance of coupling.

When the corrugated pipe 4 extends and the joint seat 6 and the pipe barrel 1 are far away from each other, the joint seat 6 drives the sliding ring 12 to move towards the direction far away from the pipe barrel 1, the sliding ring 12 compresses the second spring 13, after hydraulic oil flows in the hard pipe 2 and the corrugated pipe 4 for a period of time, the impact force of the hydraulic oil is reduced and tends to be stable, at the moment, the sliding ring 12 drives the joint seat 6 to move towards the direction close to the pipe barrel 1 through the elastic action of the second spring 13, the corrugated pipe 4 is shortened, the first spring 9 pulls the sliding block 8 to move towards the direction far away from the turning wheel 11, and the sliding block 8 drives the locking claw 7 to move away from the end part of the thread ring 24. Through setting up sliding ring 12, be favorable to protecting bellows 4, prevent that it from receiving the impact of external environment to take place to break to sliding ring 12 and second spring 13 can help bellows 4 to shorten and reset, even bellows 4 fracture, joint holder 6 still is connected with barrel 1 through sliding ring 12, avoids joint holder 6 and barrel 1 separation to cause the incident.

When the hydraulic system runs for a long time, the oil temperature of the hydraulic oil can be increased, the stable running of the hydraulic system is not facilitated due to the fact that the oil temperature of the hydraulic oil is too high, and the cooling mechanism is helpful for reducing the oil temperature of the hydraulic oil. The cooling chamber 14 and the heat dissipation water bag 16 are filled with condensed water, and when the hydraulic oil flows through the hard tube 2, the condensed water absorbs a part of heat of the hydraulic oil through the outer wall of the hard tube 2, so as to achieve the effect of reducing the oil temperature. However, when the amount of heat absorbed by the condensed water is too much, the temperature of the condensed water itself will also rise, so when the hydraulic system is restarted, the joint seat 6 is far away from the pipe barrel 1, the joint seat 6 pulls the piston rod 17, the piston rod 17 moves in the direction far away from the piston barrel 18, a part of the condensed water inside the heat dissipation water bag 16 enters the piston barrel 18, the condensed water with higher temperature in the cooling cavity 14 enters the heat dissipation water bag 16 and mixes with the condensed water with lower temperature in the heat dissipation water bag 16 to reduce the temperature of the condensed water, when the hydraulic system runs stably, the joint seat 6 moves in the direction close to the pipe barrel 1, the piston rod 17 pushes the condensed water in the piston barrel 18 to enter the heat dissipation water bag 16, and a part of the mixed condensed water in the heat dissipation water bag 16 enters the cooling cavity 14 to continue cooling the hydraulic oil. The corrugated outer wall of the heat dissipation water bag 16 can accelerate the heat dissipation of the condensed water.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.