A hydraulic cylinder to prevent overheating

Abstract

The invention discloses an anti-overheating hydraulic cylinder, which relates to the technical field of hydraulic cylinders. The hydraulic cylinder includes a cylinder body, a piston rod, a base, an end cover, a heat-conducting sleeve, a heat-conducting slide bar and a fluid control box through an internal cooling structure. The base is fixedly arranged at one end of the cylinder body, the end cover is fixedly arranged at the other end of the cylinder body, the heat-conducting sleeve is fixedly arranged at the outside of the cylinder body, the heat-conducting slide bar and the fluid control box are both fixedly connected to the base, a cooling cavity is provided inside the heat-conducting sleeve, a cooling pipe is provided inside the heat-conducting slide bar, and the cooling cavity and the cooling pipe are both connected to the fluid control box, so that the direct transfer and dissipation of heat inside the hydraulic cylinder is realized, and the time delay required for the heat to be transferred from the inside to the outside is avoided, thereby significantly improving the heat dissipation efficiency. Due to the improvement of the heat dissipation efficiency, the temperature inside the hydraulic cylinder is effectively controlled, the aging speed of the hydraulic oil and the sealing material is reduced, and the service life of the hydraulic cylinder is extended.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to an overheat-proof hydraulic cylinder. Background Art

[0002] Hydraulic cylinders, as key actuators in hydraulic transmission systems, convert hydraulic energy into mechanical energy to drive loads to perform linear reciprocating motion. With simple structure and reliable operation, hydraulic cylinders are widely used in various mechanical equipment.

[0003] During the operation of the hydraulic cylinder, a large amount of heat will be generated due to factors such as friction, leakage of the liquid and friction of mechanical parts. When this heat cannot be dissipated in time, it will cause the internal temperature of the hydraulic cylinder to rise, which will lead to a series of problems. For example, if the temperature of the hydraulic oil is too high, the viscosity and lubrication performance of the oil will be reduced, and the wear of mechanical parts will be increased; at the same time, high temperature will also accelerate the aging of the hydraulic oil and sealing materials, reducing the sealing performance and service life of the hydraulic cylinder.

[0004] The prior art has proposed some solutions to the overheating problem of hydraulic cylinders. For example, the Chinese patent with the announcement number CN113775609A discloses an anti-overheating hydraulic cylinder with a buffer structure. The hydraulic cylinder buffers the piston assembly by designing a buffer assembly and an elastic positioning block to reduce the impact force, thereby increasing the service life of the cylinder. At the same time, by setting a guide sleeve to limit the direction of the piston assembly, the problem of reduced working accuracy due to offset is avoided. In addition, the hydraulic cylinder also attempts to absorb heat and cool the outside of the cylinder through external water cooling to reduce the temperature of the hydraulic oil and the piston assembly in the cylinder sleeve.

[0005] However, although the above technical solution alleviates the overheating problem of the hydraulic cylinder to a certain extent, it still has some shortcomings. Specifically, the external water cooling method can only cool the outside of the cylinder, and it takes a certain amount of time for the heat inside the hydraulic cylinder to transfer to the outside, so the heat dissipation efficiency is relatively slow. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an anti-overheating hydraulic cylinder, which solves the problem that only the outer side of the cylinder can be cooled, and it takes a certain amount of time for the heat inside the hydraulic cylinder to transfer to the outside, so the heat dissipation efficiency is relatively slow.

[0007] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the present invention, an overheating prevention hydraulic cylinder is proposed, comprising a cylinder body, a piston rod, a base, an end cover, a heat-conducting sleeve, a heat-conducting slide rod and a fluid circuit control box, wherein the base is fixedly arranged at one end of the cylinder body, the end cover is fixedly arranged at the other end of the cylinder body, the heat-conducting sleeve is fixedly arranged at the outside of the cylinder body, the heat-conducting slide rod and the fluid circuit control box are both fixedly connected to the base, and the heat-conducting slide rod is located in the cylinder body, a cooling cavity is provided on the inner side of the heat-conducting sleeve, a cooling pipe is provided on the inner side of the heat-conducting slide rod, the cooling cavity and the cooling pipe are both connected to the fluid circuit control box, the piston rod is provided with a sliding groove slidably connected to the heat-conducting slide rod, and a groove is provided on the outer side of the heat-conducting slide rod.

[0008] As a further solution of the present invention: the liquid circuit control box is provided with a liquid inlet, a liquid discharge port, a first interface, a second interface, a third interface and a fourth interface, the first interface and the second interface are both connected to the liquid inlet, the third interface and the fourth interface are both connected to the liquid discharge port, and the first interface and the third interface are both connected to the cooling cavity, and the second interface and the fourth interface are both connected to the cooling pipe.

[0009] As a further solution of the present invention: a first liquid inlet hole and a first liquid outlet hole connected to the cooling cavity are opened on the outside of the heat-conducting sleeve, and the first liquid inlet hole and the first liquid outlet hole are respectively arranged at both ends of the heat-conducting sleeve, the first liquid inlet hole is connected to the first interface, and the first liquid outlet hole is connected to the third interface.

[0010] As a further solution of the present invention: a first pipe and a second pipe are fixedly provided on the outside of the heat-conducting sleeve, one end of the first pipe is connected to the first liquid inlet, the other end of the first pipe is connected to the first interface, one end of the second pipe is connected to the first liquid outlet, and the other end of the second pipe is connected to the third interface.

[0011] As a further solution of the present invention: a second liquid inlet hole and a second liquid outlet hole are provided at the bottom of the heat-conducting sliding rod, the second liquid inlet hole is connected to one end of the cooling pipe, the second liquid outlet hole is connected to the other end of the cooling pipe, the second liquid inlet hole is connected to the second interface, and the second liquid outlet hole is connected to the fourth interface.

[0012] As a further solution of the present invention: a first passage and a second passage are opened on the inner side of the base, a third pipe and a fourth pipe are fixedly provided on the outer side of the base, the second liquid inlet hole is connected to the first passage, one end of the third pipe is connected to the first passage, the other end of the third pipe is connected to the second interface, the second liquid outlet hole is connected to the second passage, one end of the fourth pipe is connected to the second passage, and the other end of the fourth pipe is connected to the fourth interface.

[0013] As a further solution of the present invention: sealing grooves are provided at the ends of the first passage and the second passage, and sealing gaskets are fixedly arranged in the sealing grooves.

[0014] As a further solution of the present invention: a first solenoid valve is arranged in the first interface, a second solenoid valve is arranged in the second interface, a third solenoid valve is arranged in the third interface, and a fourth solenoid valve is arranged in the fourth interface.

[0015] As a further solution of the present invention: a plurality of heat-conducting rings arranged in a rectangular shape are fixedly provided on the outer side of the oil cylinder body.

[0016] As a further solution of the present invention: a temperature sensor is fixedly provided on the outside of the oil cylinder body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Through the internal cooling structure, the direct transfer and dissipation of heat inside the hydraulic cylinder is achieved, avoiding the time delay required for heat to be transferred from the inside to the outside, thereby significantly improving the heat dissipation efficiency. Due to the improved heat dissipation efficiency, the temperature inside the hydraulic cylinder is effectively controlled, reducing the aging rate of hydraulic oil and sealing materials, and extending the service life of the hydraulic cylinder. The sliding fit connection between the heat-conducting slide rod and the piston rod ensures the movement accuracy of the hydraulic cylinder and avoids the problem of component deformation and precision reduction caused by temperature increase.

[0019] 2. When the piston rod slides on the outside of the heat-conducting slide rod, the hydraulic oil can enter or discharge the slide groove inside the piston rod through the groove, so that the pressure in the slide groove is consistent with the pressure in the cylinder body, which helps to reduce the vibration and noise caused by pressure fluctuations and improve the working stability of the hydraulic cylinder.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a three-dimensional structural schematic diagram of an overheat-proof hydraulic cylinder.

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the heat-conducting sleeve in the present invention.

[0024] Figure 3 It is a three-dimensional structural schematic diagram of the liquid circuit control box in the present invention.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the heat-conducting sliding rod in the present invention.

[0026] Figure 5 It is a three-dimensional structural schematic diagram of the base in the present invention.

[0027] Figure 6 It is a three-dimensional structural sectional view of the base in the present invention.

[0028] Figure 7 It is a schematic structural diagram of the heat-conducting ring in the present invention.

[0029] Figure 8 It is a structural sectional view of the oil cylinder body in the present invention.

[0030] Fig. 9 yes Figure 8 A local enlarged schematic diagram of point A in the middle.

[0031] Fig.10 It is a schematic diagram of the three-dimensional structure of the heat-conducting sliding rod in the present invention.

[0032] Reference numerals include:

[0033] 1. Cylinder body; 2. Piston rod; 3. Base; 4. End cover; 5. Heat-conducting sleeve; 6. Heat-conducting slide rod; 7. Liquid circuit control box; 8. Cooling cavity; 9. Cooling pipeline; 10. Slide; 11. Groove; 12. Liquid inlet; 13. Liquid outlet; 14. First interface; 15. Second interface; 16. Third interface; 17. Fourth interface; 18. First liquid inlet hole; 19. First liquid outlet hole; 20. First pipeline; 21. Second pipeline; 22. Second liquid inlet hole; 23. Second liquid outlet hole; 24. First passage; 25. Second passage; 26. Third pipeline; 27. Fourth pipeline; 28. Sealing gasket; 29. ​​Heat-conducting ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 10As shown, an overheating prevention hydraulic cylinder includes a cylinder body 1, a piston rod 2, a base 3, an end cover 4, a heat-conducting sleeve 5, a heat-conducting sliding rod 6 and a hydraulic circuit control box 7. The base 3 is fixedly arranged at one end of the cylinder body 1, and the end cover 4 is fixedly arranged at the other end of the cylinder body 1. When the hydraulic system is working, the hydraulic oil is pumped into the cylinder body 1 through the through hole of the base 3 or the end cover 4, thereby pushing the piston rod 2 to perform linear reciprocating motion.

[0036] The heat-conducting sleeve 5 is fixedly arranged on the outside of the oil cylinder body 1, the heat-conducting slide rod 6 and the liquid circuit control box 7 are both fixedly connected to the base 3, and the heat-conducting slide rod 6 is located in the oil cylinder body 1, the piston rod 2 is provided with a slide groove 10 that is slidably connected with the heat-conducting slide rod 6, and the outside of the heat-conducting slide rod 6 is provided with a groove 11. A cooling cavity 8 is provided inside the heat-conducting sleeve 5, and a cooling pipe 9 is provided inside the heat-conducting slide rod 6. The cooling cavity 8 and the cooling pipe 9 are both connected to the liquid circuit control box 7 to form a closed cooling circulation system.

[0037] It should be specifically explained that a groove 11 is provided on the outer side of the heat-conducting slide rod 6. The function of the groove 11 is that when the piston rod 2 slides on the outer side of the heat-conducting slide rod 6, the hydraulic oil can enter or discharge the slide groove 10 inside the piston rod 2 through the groove 11, so that the pressure in the slide groove 10 is consistent with the pressure in the cylinder body 1, which helps to reduce the vibration and noise caused by pressure fluctuations and improves the working stability of the hydraulic cylinder.

[0038] During the operation of the hydraulic cylinder, the liquid circuit control box 7 injects coolant, such as cooling water or coolant oil, into the cooling cavity 8 and the cooling pipe 9. The coolant circulates in the cooling cavity 8 and the cooling pipe 9 to absorb the heat generated inside the hydraulic cylinder. The material of the heat-conducting sleeve 5 and the heat-conducting slide bar 6 can be selected from materials with good thermal conductivity such as copper-aluminum alloy or stainless steel. Specifically, the copper-aluminum alloy has excellent thermal conductivity and certain mechanical strength, and can quickly transfer the heat inside the hydraulic cylinder to the coolant to achieve efficient heat dissipation. At the same time, the copper-aluminum alloy also has good corrosion resistance and can maintain stable performance in a humid or corrosive environment. Stainless steel has good corrosion resistance and high temperature resistance, and is suitable for hydraulic cylinders working in harsh working environments. Therefore, the heat-conducting sleeve 5 and the heat-conducting slide bar 6 can effectively transfer the heat inside the hydraulic cylinder to the coolant.

[0039] After absorbing the heat, the coolant flows out through the liquid circuit control box 7, passes through an external heat dissipation device such as a radiator or a cooling tower for heat dissipation, and then is pumped back to the liquid circuit control box 7 to continue participating in the cooling cycle. In this way, the heat inside the hydraulic cylinder can be continuously and efficiently dissipated.

[0040] Through the internal cooling structure, the direct transfer and dissipation of heat inside the hydraulic cylinder is achieved, avoiding the time delay required for heat to be transferred from the inside to the outside, thereby significantly improving the heat dissipation efficiency. Due to the improved heat dissipation efficiency, the temperature inside the hydraulic cylinder is effectively controlled, reducing the aging rate of the hydraulic oil and sealing materials, and extending the service life of the hydraulic cylinder. The sliding fit connection between the heat-conducting slide rod 6 and the piston rod 2 ensures the movement accuracy of the hydraulic cylinder and avoids the problem of component deformation and precision reduction caused by temperature increase.

[0041] refer to Figure 2 and Figure 3 As shown, in some specific embodiments, the liquid circuit control box 7 is provided with a liquid inlet 12, a liquid discharge port 13, a first interface 14, a second interface 15, a third interface 16 and a fourth interface 17, the first interface 14 and the second interface 15 are both connected to the liquid inlet 12, the third interface 16 and the fourth interface 17 are both connected to the liquid discharge port 13, and the first interface 14 and the third interface 16 are both connected to the cooling cavity 8, and the second interface 15 and the fourth interface 17 are both connected to the cooling pipe 9.

[0042] Specifically, the liquid inlet 12 and the liquid outlet 13 are used to receive and discharge the coolant. The coolant can be cooling water, coolant oil or other fluids with efficient heat dissipation performance. When the system needs to be cooled, the coolant enters the liquid circuit control box 7 from an external heat dissipation device, such as a radiator or a cooling tower, through the liquid inlet 12.

[0043] Inside the liquid circuit control box 7, the coolant is guided to the cooling cavity 8 and the cooling pipe 9 respectively through the first interface 14 and the second interface 15. The first interface 14 is connected to the cooling cavity 8 to ensure that the coolant can enter and flow through the cooling cavity 8 to absorb the heat transferred from the hydraulic cylinder body 1 through the heat-conducting sleeve 5. The third interface 16 is also connected to the cooling cavity 8, but is used to discharge the coolant that has absorbed heat from the cooling cavity 8, return it to the liquid circuit control box 7, and finally flow to the external heat dissipation device for heat dissipation. The second interface 15 is connected to the cooling pipe 9 to ensure that the coolant enters and flows through the cooling pipe 9 on the inner side of the heat-conducting slide 6 to absorb the heat transferred through the heat-conducting slide 6. The fourth interface 17 is connected to the cooling pipe 9 to discharge the coolant that has absorbed heat from the cooling pipe 9, also return it to the liquid circuit control box 7, and finally flow to the external heat dissipation device.

[0044] refer to Figure 8 and Fig. 9 As shown, in some specific embodiments, a first liquid inlet hole 18 and a first liquid outlet hole 19 connected to the cooling cavity 8 are opened on the outside of the heat-conducting sleeve 5, and the first liquid inlet hole 18 and the first liquid outlet hole 19 are respectively arranged at two ends of the heat-conducting sleeve 5, the first liquid inlet hole 18 is connected to the first interface 14, and the first liquid outlet hole 19 is connected to the third interface 16.

[0045] When the cooling system starts working, the coolant enters from the external heat dissipation device through the liquid inlet 12 of the liquid circuit control box 7. The coolant first communicates with the first liquid inlet hole 18 on the outside of the heat-conducting sleeve 5 through the first interface 14 and enters the cooling cavity 8. In the cooling cavity 8, the coolant absorbs the heat transferred by the heat-conducting sleeve 5, which comes from the heat conduction of the hydraulic cylinder body 1 through the heat-conducting sleeve 5. The coolant that has absorbed the heat then flows out through the first liquid outlet hole 19 on the outside of the heat-conducting sleeve 5 and communicates with the third interface 16 of the liquid circuit control box 7. After the coolant flows in from the third interface 16, it returns to the liquid circuit control box 7, and finally flows to the external heat dissipation device for heat dissipation, completing a complete cooling cycle.

[0046] refer to Figure 2 and Figure 3 As shown, in some specific embodiments, a first pipe 20 and a second pipe 21 are fixedly provided on the outside of the heat-conducting sleeve 5, one end of the first pipe 20 is connected to the first liquid inlet 18, the other end of the first pipe 20 is connected to the first interface 14, one end of the second pipe 21 is connected to the first liquid outlet 19, and the other end of the second pipe 21 is connected to the third interface 16.

[0047] When the cooling system starts working, the coolant enters from the external heat dissipation device through the liquid inlet 12 of the liquid circuit control box 7. The coolant is first connected to one end of the first pipe 20 through the first interface 14, and then flows along the first pipe 20 to the first liquid inlet hole 18 on the outside of the heat-conducting sleeve 5. At the first liquid inlet hole 18, the coolant enters the cooling cavity 8 and begins to absorb the heat transferred by the heat-conducting sleeve 5. The coolant that has absorbed the heat then flows out through the first liquid outlet hole 19 on the outside of the heat-conducting sleeve 5 and enters the second pipe 21 connected to the first liquid outlet hole 19. The coolant flows along the second pipe 21 to the third interface 16 of the liquid circuit control box 7, and flows out from the third interface 16, and finally returns to the external heat dissipation device for heat dissipation, completing a complete cooling cycle.

[0048] refer to Figure 3 and Fig. 9 As shown, in some specific embodiments, a second liquid inlet hole 22 and a second liquid outlet hole 23 are provided at the bottom of the heat-conducting sliding rod 6, the second liquid inlet hole 22 is connected to one end of the cooling pipe 9, the second liquid outlet hole 23 is connected to the other end of the cooling pipe 9, the second liquid inlet hole 22 is connected to the second interface 15, and the second liquid outlet hole 23 is connected to the fourth interface 17.

[0049] When the cooling system starts working, the coolant enters from the external heat dissipation device through the liquid inlet 12 of the liquid circuit control box 7. The coolant first communicates with the second liquid inlet hole 22 at the bottom of the heat-conducting slide 6 through the second interface 15 and enters the cooling pipe 9. In the cooling pipe 9, the coolant absorbs the heat transferred by the heat-conducting slide 6, which comes from the heat conduction of the hydraulic cylinder body 1 through the heat-conducting slide 6. The coolant that has absorbed the heat then flows out through the second liquid outlet 23 at the bottom of the heat-conducting slide 6 and communicates with the fourth interface 17 of the liquid circuit control box 7. After the coolant flows in from the fourth interface 17, it returns to the liquid circuit control box 7, and finally flows to the external heat dissipation device for heat dissipation, completing a complete cooling cycle.

[0050] refer to Fig. 9 As shown, in some specific embodiments, a first passage 24 and a second passage 25 are opened on the inner side of the base 3, a third pipe 26 and a fourth pipe 27 are fixedly provided on the outer side of the base 3, the second liquid inlet 22 is connected to the first passage 24, one end of the third pipe 26 is connected to the first passage 24, the other end of the third pipe 26 is connected to the second interface 15, the second liquid outlet 23 is connected to the second passage 25, one end of the fourth pipe 27 is connected to the second passage 25, and the other end of the fourth pipe 27 is connected to the fourth interface 17.

[0051] When the cooling system starts working, the coolant enters from the external heat dissipation device through the liquid inlet 12 of the liquid circuit control box 7. The coolant is first connected to one end of the third pipe 26 through the second interface 15, then enters the first passage 24 along the third pipe 26, and then flows to the second liquid inlet hole 22 at the bottom of the thermal slide 6. At the second liquid inlet hole 22, the coolant enters the cooling pipe 9 and begins to absorb the heat transferred by the thermal slide 6. The coolant that has absorbed the heat then enters the second passage 25 through the second liquid outlet hole 23 at the bottom of the thermal slide 6, and then enters the fourth pipe 27. The coolant flows along the fourth pipe 27 to the fourth interface 17 of the liquid circuit control box 7, and returns from the fourth interface 17 to the external heat dissipation device for heat dissipation, completing a complete cooling cycle.

[0052] refer to Figure 6 and Fig. 9 As shown, in some specific embodiments, sealing grooves are provided at the ports of the first passage 24 and the second passage 25, and sealing gaskets 28 are fixedly arranged in the sealing grooves. The function of the sealing gaskets 28 is to ensure that the coolant does not leak from these ports during the flow process, thereby ensuring the sealing and efficiency of the cooling system.

[0053] In some specific embodiments, a first solenoid valve is provided in the first interface 14 to control the flow rate and switch of the fluid entering the cooling cavity 8. A second solenoid valve is provided in the second interface 15 to control the flow rate and switch of the fluid entering the cooling pipe 9. A third solenoid valve is provided in the third interface 16 to control the flow rate and switch of the fluid discharged from the cooling cavity 8. A fourth solenoid valve is provided in the fourth interface 17 to control the flow rate and switch of the fluid discharged from the cooling pipe 9. By controlling the flow rate, the heat dissipation efficiency can be optimized to ensure that the internal temperature of the hydraulic cylinder remains within a safe range.

[0054] refer to Figure 7 and Figure 8 As shown, in some specific embodiments, a plurality of heat-conducting rings 29 arranged in a matrix are fixedly arranged on the outside of the oil cylinder body 1. The heat-conducting rings 29 can increase the heat dissipation area on the outside of the oil cylinder body 1, thereby increasing the contact area between the oil cylinder body 1 and the coolant in the cooling cavity 8, and achieving more efficient heat exchange. The coolant circulates in the cooling cavity 8, and further reduces the temperature of the oil cylinder body 1 by absorbing the heat transferred by the heat-conducting rings 29.

[0055] In some specific implementation schemes, a temperature sensor is fixedly provided on the outside of the oil cylinder body 1. The temperature sensor can monitor the temperature of the oil cylinder body 1 in real time, ensuring that the operator or the control system can instantly obtain the working temperature information of the hydraulic cylinder. When the temperature reaches the preset safety threshold, the control system can control the liquid circuit control box 7 to increase the flow rate of the coolant, thereby effectively preventing the hydraulic cylinder from overheating and preventing equipment damage or safety accidents caused by overheating.

[0056] In order to facilitate the understanding of the embodiments of the present invention by those skilled in the art, the working principle of the embodiments of the present invention is now described in combination with specific application scenarios:

[0057] The hydraulic cylinder receives hydraulic oil from the hydraulic system through the through holes of the base 3 and the end cover 4. The hydraulic oil pushes the piston rod 2 to perform linear reciprocating motion, thereby realizing the basic function of the hydraulic cylinder. In this process, due to factors such as the friction between the hydraulic oil and the piston rod 2 and the compression of the hydraulic oil, a certain amount of heat is generated, causing the temperature of the hydraulic cylinder to rise.

[0058] In order to effectively dissipate heat, the hydraulic cylinder is designed with an internal cooling structure. The heat-conducting sleeve 5 is tightly wrapped around the outside of the cylinder body 1, and the heat-conducting slide rod 6 is located inside the cylinder body 1 and slides with the piston rod 2. The cooling cavity 8 opened inside the heat-conducting sleeve 5 and the cooling pipe 9 opened inside the heat-conducting slide rod 6 together constitute a closed cooling circulation system.

[0059] When the cooling system starts working, the liquid circuit control box 7 receives the coolant from the external heat dissipation device, such as a radiator or a cooling tower, through the liquid inlet 12. The coolant enters the cooling cavity 8 and the cooling pipe 9 through the first interface 14 and the second interface 15 respectively. In the cooling cavity 8, the coolant absorbs the heat transferred by the heat-conducting sleeve 5, and this heat comes from the heat conduction of the hydraulic cylinder body 1 through the heat-conducting sleeve 5. Similarly, in the cooling pipe 9, the coolant absorbs the heat transferred by the heat-conducting slide 6. The coolant that has absorbed the heat is then discharged from the cooling cavity 8 and the cooling pipe 9 through the third interface 16 and the fourth interface 17, returned to the liquid circuit control box 7, and finally flows to the external heat dissipation device for heat dissipation.

[0060] In order to ensure the sealing and efficiency of the cooling system, sealing grooves are provided at the ports of the first passage 24 and the second passage 25, and sealing gaskets 28 are fixedly provided. In addition, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are respectively provided in the first interface 14, the second interface 15, the third interface 16 and the fourth interface 17. These solenoid valves are used to control the flow and switch of the fluid entering and discharging the cooling cavity 8 and the cooling pipe 9, so as to optimize the heat dissipation efficiency and ensure that the internal temperature of the hydraulic cylinder is kept within a safe range.

[0061] In order to further increase the heat dissipation area and improve the heat exchange efficiency, a plurality of heat-conducting rings 29 arranged in a matrix are fixedly arranged on the outside of the oil cylinder body 1. The heat-conducting rings 29 can increase the heat dissipation area on the outside of the oil cylinder body 1, so that the coolant can absorb more heat when circulating in the cooling cavity 8, and further reduce the temperature of the oil cylinder body 1.

[0062] At the same time, a temperature sensor is fixedly provided on the outside of the oil cylinder body 1. The temperature sensor can monitor the temperature of the oil cylinder body 1 in real time and feed back the temperature information to the control system. When the temperature reaches the preset safety threshold, the control system can control the liquid circuit control box 7 to increase the flow of the coolant, thereby effectively preventing the hydraulic cylinder from overheating and preventing equipment damage or safety accidents caused by overheating.

[0063] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An overheat-proof hydraulic cylinder, comprising a cylinder body (1), a piston rod (2), a base (3) and an end cover (4), wherein the base (3) is fixedly arranged at one end of the cylinder body (1), and the end cover (4) is fixedly arranged at the other end of the cylinder body (1), characterized in that: Also includes: A heat-conducting sleeve (5), a heat-conducting slide rod (6) and a liquid circuit control box (7), wherein the heat-conducting sleeve (5) is fixedly arranged on the outer side of the oil cylinder body (1), the heat-conducting slide rod (6) and the liquid circuit control box (7) are both fixedly connected to the base (3), and the heat-conducting slide rod (6) is located in the oil cylinder body (1), a cooling cavity (8) is provided on the inner side of the heat-conducting sleeve (5), a cooling pipe (9) is provided on the inner side of the heat-conducting slide rod (6), and the cooling cavity (8) and the cooling pipe (9) are both connected to the liquid circuit control box (7), the piston rod (2) is provided with a slide groove (10) which is slidably connected to the heat-conducting slide rod (6), and a groove (11) is provided on the outer side of the heat-conducting slide rod (6).

2. The overheat-proof hydraulic cylinder according to claim 1, characterized in that: The liquid circuit control box (7) is provided with a liquid inlet (12), a liquid discharge port (13), a first interface (14), a second interface (15), a third interface (16) and a fourth interface (17); the first interface (14) and the second interface (15) are both connected to the liquid inlet (12); the third interface (16) and the fourth interface (17) are both connected to the liquid discharge port (13); the first interface (14) and the third interface (16) are both connected to the cooling cavity (8); and the second interface (15) and the fourth interface (17) are both connected to the cooling pipe (9).

3. The overheat-proof hydraulic cylinder according to claim 2, characterized in that: A first liquid inlet hole (18) and a first liquid outlet hole (19) which are in communication with the cooling cavity (8) are provided on the outside of the heat-conducting sleeve (5), and the first liquid inlet hole (18) and the first liquid outlet hole (19) are respectively arranged at two ends of the heat-conducting sleeve (5), the first liquid inlet hole (18) is in communication with the first interface (14), and the first liquid outlet hole (19) is in communication with the third interface (16).

4. The overheat-proof hydraulic cylinder according to claim 3, characterized in that: A first pipe (20) and a second pipe (21) are fixedly provided on the outside of the heat-conducting sleeve (5); one end of the first pipe (20) is connected to the first liquid inlet (18); the other end of the first pipe (20) is connected to the first interface (14); one end of the second pipe (21) is connected to the first liquid outlet (19); and the other end of the second pipe (21) is connected to the third interface (16).

5. The overheat-proof hydraulic cylinder according to claim 2, characterized in that: A second liquid inlet hole (22) and a second liquid outlet hole (23) are provided at the bottom of the heat-conducting sliding rod (6); the second liquid inlet hole (22) is connected to one end of the cooling pipe (9); the second liquid outlet hole (23) is connected to the other end of the cooling pipe (9); the second liquid inlet hole (22) is connected to the second interface (15); and the second liquid outlet hole (23) is connected to the fourth interface (17).

6. The overheat-proof hydraulic cylinder according to claim 5, characterized in that: A first passage (24) and a second passage (25) are provided on the inner side of the base (3); a third pipe (26) and a fourth pipe (27) are fixedly provided on the outer side of the base (3); the second liquid inlet hole (22) is connected to the first passage (24); one end of the third pipe (26) is connected to the first passage (24); the other end of the third pipe (26) is connected to the second interface (15); the second liquid outlet hole (23) is connected to the second passage (25); one end of the fourth pipe (27) is connected to the second passage (25); and the other end of the fourth pipe (27) is connected to the fourth interface (17).

7. The overheat-proof hydraulic cylinder according to claim 6, characterized in that: Sealing grooves are provided at the ends of the first passage (24) and the second passage (25), and sealing gaskets (28) are fixedly arranged in the sealing grooves.

8. The overheat-proof hydraulic cylinder according to claim 2, characterized in that: A first solenoid valve is arranged in the first interface (14), a second solenoid valve is arranged in the second interface (15), a third solenoid valve is arranged in the third interface (16), and a fourth solenoid valve is arranged in the fourth interface (17).

9. The overheat-proof hydraulic cylinder according to claim 1, characterized in that: A plurality of heat-conducting rings (29) arranged in a rectangular pattern are fixedly arranged on the outer side of the oil cylinder body (1).

10. The overheat-proof hydraulic cylinder according to claim 1, characterized in that: A temperature sensor is fixedly provided on the outside of the oil cylinder body (1).

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