Hydraulic oil automatic circulation cooling oil cylinder

Abstract

The hydraulic oil automatic circulation cooling oil cylinder comprises an oil cylinder body, a main piston rod is arranged on the oil cylinder body, and a liquid cooling mechanism used for conducting liquid cooling heat dissipation on an oil cylinder body is arranged on the outer wall of the oil cylinder body; the liquid cooling mechanism comprises an inner pipe body and an outer pipe body, the upper end and the lower end of the outer pipe body and the upper end and the lower end of the inner pipe body are sealed through sealing rings, a shifting plate is arranged on the outer wall of the inner pipe body, an inner liquid groove is formed in the inner wall of the outer pipe body, and the shifting plate divides the inner liquid groove into a first liquid cavity and a second liquid cavity; oil pressure of the oil cylinder for driving the main piston rod to move up and down is utilized to drive the outer pipe body to rotate back and forth relative to the inner pipe body, heat exchange and heat dissipation actions of alternate circulation of cooling liquid in the inner liquid tank are achieved, the cylinder body temperature when the oil cylinder works can be effectively reduced, the operation life and the operation stability of a hydraulic system are effectively improved, and the oil cylinder has market prospects and is worthy of popularization. Popularization and application are facilitated.

Description

Technical Field

[0001] The present application relates to the field of oil cylinders, and in particular to an oil cylinder with automatic circulation cooling of hydraulic oil. Background Art

[0002] Hydraulic cylinder (or hydraulic cylinder) is a key device in hydraulic system that converts hydraulic energy into mechanical energy. It is widely used in various mechanical equipment and industrial systems. The working principle of the hydraulic cylinder is based on Pascal's principle, that is, in a closed liquid, the pressure change will be evenly transmitted to every part of the liquid. When the hydraulic pump delivers hydraulic oil to the inside of the cylinder, the pressure of the oil acts on the piston, pushing the piston to move in the cylinder, thereby generating linear motion. Since the movement of the piston in the cylinder is the basic working process of the hydraulic cylinder, during the rapid or repeated movement of the piston, the friction between the piston and the cylinder wall will generate heat; Since the seals in the hydraulic system are usually made of rubber, excessively high temperatures may cause the seals to deform, age or fail, thereby causing leakage and performance degradation of the hydraulic system. For this reason, a hydraulic oil automatic circulation cooling cylinder is proposed. Summary of the invention

[0003] The purpose of the present application is to solve the technical problem that the existing hydraulic cylinder generates high temperature during operation, causing the deformation of the seal and affecting the performance of the hydraulic system. Compared with the existing technology, a hydraulic oil automatic circulation cooling cylinder is provided, comprising a cylinder, a base is fixed to the bottom of the cylinder, a main piston rod is slidably connected to the top of the cylinder, and a liquid cooling mechanism for liquid cooling and heat dissipation of the cylinder body is provided on the outer wall of the cylinder; The liquid cooling mechanism comprises an inner tube body and an outer tube body, wherein the inner tube body is fixedly sleeved on the outer wall of the oil cylinder by means of heat-conducting silicone, the outer tube body is rotatably sleeved on the outer side of the inner tube body, the upper and lower ends of the outer tube body and the inner tube body are sealed by a sealing ring, a plurality of paddles are evenly fixed on the outer wall of the inner tube body, the inner wall of the outer tube body is provided with inner liquid grooves corresponding to the inner tube body one by one, the outer wall of the outer tube body is provided with an outer air groove between two adjacent inner liquid grooves, the paddles separate the inner liquid groove into a first liquid cavity and a second liquid cavity, and elastic capsules are provided in the first liquid cavity and the second liquid cavity; A reflux chamber is provided at the top of the oil cylinder, the reflux chamber is filled with coolant, a heat dissipation fin is fixed to one side of the outer wall of the reflux chamber, the reflux chamber includes a first reflux groove and a second reflux groove, the first reflux groove is connected to the elastic sac of the first liquid chamber, and the second reflux groove is connected to the elastic sac of the second liquid chamber; The oil cylinder is also provided with a driving mechanism for driving the outer tube body to reciprocate relative to the inner tube body and an air cooling mechanism for providing heat dissipation air for the outer air groove.

[0004] Furthermore, the driving mechanism includes an oil chamber arranged at the top of the oil cylinder, a sliding ring is slidably connected in the oil chamber along the vertical direction, a torsion spring is fixed between the top of the sliding ring and the oil chamber, an upper magnetic ring is fixed at the bottom of the sliding ring, and the upper magnetic ring includes a plurality of adjacent magnetic blocks with different magnetic properties; A lower magnetic ring is fixed on the top of the outer tube body, and the lower magnetic ring includes a plurality of adjacent magnetic blocks with different magnetic properties.

[0005] Furthermore, the outer wall of the oil cylinder is provided with a retracting oil circuit and a lifting oil circuit, the output end of the retracting oil circuit extends into the oil cylinder and is arranged at the top of the piston of the main piston rod, and the output end of the lifting oil circuit extends into the oil cylinder and is arranged at the bottom of the piston of the main piston rod; The output end of the retraction oil circuit is also branched and extends into the oil chamber and is arranged on a side of the sliding ring away from the torsion spring.

[0006] Furthermore, the air cooling mechanism comprises an air storage tank arranged on the top of the base, a valve seat at the output end of the air storage tank, a valve core matching the valve seat is arranged on the valve seat, and a tension spring is clamped between the valve core and the valve seat; The output end of the valve seat is also connected to a connecting pipe, and the inner wall of the oil cylinder is also provided with a second air channel, a heat-conducting rod is inserted in the second air channel, and one end of the heat-conducting rod away from the second air channel passes through the connecting pipe and extends into the valve seat, a heat-conducting seat is fixed to the end of the heat-conducting rod in the valve seat, a limiting sleeve is fixed to the top of the heat-conducting seat, and an expansion bag is fixed in the limiting sleeve.

[0007] Furthermore, the tension spring has an elastic force that drives the valve core to move downward to fit the upper port of the valve seat.

[0008] Furthermore, the expansion bag is filled with carbon dioxide gas.

[0009] Furthermore, an air bin is provided at the bottom of the outer tube body, a release port is also provided on one side of the second air channel, the second air channel is connected to the air bin through the release port, and an air hole connected to the air bin is provided at the bottom of the outer air groove.

[0010] Furthermore, the output end of the air hole has a smaller aperture than the output end, and the top of the outer air groove is also provided with an air guide groove.

[0011] Furthermore, a cylinder is provided on the top of the base, a secondary piston rod matching the cylinder is fixed to the bottom of the base, a one-way exhaust valve and a one-way air intake valve are provided at the bottom of the cylinder, and the one-way exhaust valve is connected to the air storage tank.

[0012] Furthermore, a third air channel is provided on one side of the top of the cylinder, and a first air channel is provided in the base. The input end of the first air channel is connected to the output end of the third air channel, and the output end of the first air channel is arranged opposite to the bottom of the outer air groove.

[0013] Compared with the prior art, the advantages of this application are: The present invention realizes heat exchange and heat dissipation action of alternating circulation of coolant in the inner liquid tank through the mutual cooperation between the inner tube body with the paddle plate and the outer tube body with the inner liquid tank, utilizes the oil pressure of the oil cylinder to drive the main piston rod to move up and down, drives the outer tube body to rotate back and forth relative to the inner tube body, and can effectively reduce the cylinder body temperature when the oil cylinder is working, prevents the seals in the hydraulic system from being deformed, aged or failed due to excessive temperature, thereby causing leakage of the hydraulic system and performance degradation, thereby effectively improving the service life and operation stability of the hydraulic system, has market prospects, and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front structure of this application; Figure 2 This is a schematic diagram of the bottom structure of this application; Figure 3 It is a structural schematic diagram of the liquid cooling mechanism and the oil cylinder proposed in this application; Figure 4 It is a schematic diagram of the explosion structure of the liquid cooling mechanism proposed in this application; Figure 5 It is a schematic diagram of the transverse cross-sectional structure of the liquid cooling mechanism proposed in this application; Figure 6 It is a schematic diagram of the transverse cross-sectional structure of the reflux chamber proposed in this application; Figure 7 It is a schematic diagram of the cross-sectional structure of this application; Figure 8 for Figure 7 A schematic diagram of the structure of the middle A part; Fig. 9 It is a schematic diagram of the structure of the sliding ring and the outer tube body proposed in this application; Fig.10 for Figure 7 A schematic diagram of the structure of the middle B part; Fig.11 for Figure 7 The enlarged schematic diagram of the structure of the middle C part; Fig.12 It is a schematic diagram of the longitudinal cross-sectional structure of the liquid cooling mechanism proposed in this application; Fig.13 for Fig.12 The enlarged schematic diagram of the structure of the middle E part; Fig.14 for Fig.12The enlarged schematic diagram of the structure of the middle F part; Fig.15 It is a schematic diagram of the gas flow direction of the first air channel when the main piston rod moves upward in this application; Fig.16 This is a schematic diagram of the structure when the main piston rod in this application moves downward to exhaust gas into the gas storage tank; Fig.17 This is a schematic diagram of the structure when the valve core moves upward in this application.

[0015] Description of the numbers in the figure: Cylinder 1, retraction oil circuit 101, lifting oil circuit 102, oil chamber 11, reflux chamber 12, first reflux groove 121, second reflux groove 122, heat dissipation fin 123, main piston rod 2, base 3, first air channel 31, liquid cooling mechanism 4, inner tube body 41, paddle 411, outer tube body 42, air chamber 421, lower magnetic ring 422, inner liquid tank 423, first liquid chamber 4231, second liquid chamber 4232, outer Air groove 424, air hole 425, air guide groove 426, cylinder 5, auxiliary piston rod 51, one-way exhaust valve 52, one-way intake valve 53, third air channel 54, air storage tank 6, valve core 61, tensioning spring 62, valve seat 63, heat conducting rod 7, second air channel 701, release port 702, connecting pipe 71, expansion bag 73, heat conducting seat 74, limit sleeve 75, sliding ring 8, torsion spring 81, upper magnetic ring 82. DETAILED DESCRIPTION

[0016] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application.

[0017] Embodiment 1: The present invention provides a hydraulic oil automatic circulation cooling cylinder, see Figure 1-17 , comprising an oil cylinder 1, a base 3 is fixed to the bottom of the oil cylinder 1, a main piston rod 2 is slidably connected to the top of the oil cylinder 1, and a liquid cooling mechanism 4 is provided on the outer wall of the oil cylinder 1 for liquid cooling and heat dissipation of the cylinder body of the oil cylinder 1; The liquid cooling mechanism 4 comprises an inner tube body 41 and an outer tube body 42, wherein the inner tube body 41 and the outer tube body 42 are both made of aluminum structure. To improve the heat conduction efficiency between the inner tube body 41 and the oil cylinder 1, the inner tube body 41 is fixedly sleeved on the outer wall of the oil cylinder 1 through heat-conducting silicone rubber, and the outer tube body 42 is rotatably sleeved on the outer side of the inner tube body 41. The upper and lower ends of the outer tube body 42 and the inner tube body 41 are sealed by a sealing ring. A plurality of paddles 411 are evenly and evenly fixed on the outer wall of the inner tube body 41. An inner wall of the outer tube body 42 is provided with inner liquid grooves 423 corresponding to the inner tube body 41 one by one. An outer wall of the outer tube body 42 is provided with an outer gas groove 424 between two adjacent inner liquid grooves 423. The paddle 411 separates the inner liquid groove 423 into a first liquid cavity 4231 and a second liquid cavity 4232. Elastic capsules are provided in the first liquid cavity 4231 and the second liquid cavity 4232. A reflux chamber 12 is provided at the top of the oil cylinder 1. The reflux chamber 12 is filled with a coolant, specifically, ethylene glycol. A heat dissipation fin 123 is fixed to one side of the outer wall of the reflux chamber 12. The reflux chamber 12 includes a first reflux groove 121 and a second reflux groove 122. The first reflux groove 121 is connected to the elastic capsule of the first liquid chamber 4231, and the second reflux groove 122 is connected to the elastic capsule of the second liquid chamber 4232. The oil cylinder 1 is also provided with a driving mechanism for driving the outer tube body 42 to reciprocate relative to the inner tube body 41 and an air cooling mechanism for providing heat dissipation air for the outer air groove 424 .

[0018] During actual use, the driving mechanism is used to drive the outer tube body 42 to reciprocate relative to the inner tube body 41, so that the paddle 411 swings relative to the inner liquid tank 423 in a circular direction, and the elastic capsule of the first liquid chamber 4231 is squeezed to release the elastic capsule of the second liquid chamber 4232, and the cooling liquid in the elastic capsule of the first liquid chamber 4231 is squeezed into the first reflux groove 121, and is cooled by the heat dissipation fins 123 for standby use. At this time, the cooled cooling liquid in the second reflux groove 122 flows back to the elastic capsule of the second liquid chamber 4232 by gravity, exchanges heat with the inner tube body 41 and the paddle 411, and circulates liquid cooling to dissipate heat.

[0019] For details, please refer to Figure 7-9 In this embodiment, the driving mechanism includes an oil chamber 11 arranged at the top of the oil cylinder 1, and a sliding ring 8 is slidably connected in the oil chamber 11 along the vertical direction. A torsion spring 81 is fixed between the top of the sliding ring 8 and the oil chamber 11, and an upper magnetic ring 82 is fixed to the bottom of the sliding ring 8. The upper magnetic ring 82 includes a plurality of adjacent magnetic blocks with different magnetic properties; a lower magnetic ring 422 is fixed to the top of the outer tube body 42, and the lower magnetic ring 422 includes a plurality of adjacent magnetic blocks with different magnetic properties, and the above-mentioned magnetic blocks are all rubidium magnets.

[0020] It should be noted that a retraction oil circuit 101 and a lifting oil circuit 102 are provided on the outer wall of the oil cylinder 1. The output end of the retraction oil circuit 101 extends into the oil cylinder 1 and is arranged at the top of the piston of the main piston rod 2, and the output end of the lifting oil circuit 102 extends into the oil cylinder 1 and is arranged at the bottom of the piston of the main piston rod 2; the output end of the retraction oil circuit 101 is also branched and extends into the oil chamber 11 and is arranged on the side of the sliding ring 8 away from the torsion spring 81.

[0021] When the hydraulic oil in the oil cylinder 1 is used to lift the main piston rod 2, the oil cylinder 1 provides pressurized hydraulic oil to the bottom of the piston of the main piston rod 2 through the lifting oil circuit 102, and recovers the hydraulic oil at the top of the piston of the main piston rod 2 through the retraction oil circuit 101. Since the oil chamber 11 is connected to the lifting oil circuit 102, when the lifting oil circuit 102 recovers the hydraulic oil, the oil pressure in the oil chamber 11 decreases, and the sliding ring 8 moves downward using the elastic potential energy stored in the torsion spring 81. The torsion spring 81 is fixed between the sliding ring 8 and the oil chamber 11. When the elastic potential energy of the torsion spring 81 is released, the sliding ring 8 rotates in a circular direction while moving downward. The outer tube body 42 is driven to rotate back and forth at a small angle relative to the inner tube body 41 by alternating magnetic attraction and repulsion between the upper magnetic ring 82 and the magnetic blocks on the lower magnetic ring 422, thereby realizing the alternating upward movement of the coolant in the elastic sac bodies of the first liquid chamber 4231 and the second liquid chamber 4232, thereby realizing a circulating drive.

[0022] When the hydraulic oil is used in the oil cylinder 1 to retract the main piston rod 2, the oil cylinder 1 provides pressurized hydraulic oil to the top of the piston of the main piston rod 2 through the retraction oil circuit 101, and recovers the hydraulic oil at the bottom of the piston of the main piston rod 2 through the lifting oil circuit 102. Since the oil chamber 11 is connected to the lifting oil circuit 102, when the oil pressure in the lifting oil circuit 102 increases, the oil pressure in the oil chamber 11 also increases synchronously, and then the lifting sliding ring 8 overcomes the elastic force of the torsion spring 81 and moves upward, and the elastic potential energy of the torsion spring 81 is stored. Similarly, the sliding ring 8 also rotates in a circular direction when moving upward, and then the alternating magnetic attraction and magnetic repulsion between the upper magnetic ring 82 and the magnetic blocks on the lower magnetic ring 422 can also be used to drive the outer tube body 42 to rotate back and forth at a small angle relative to the inner tube body 41, thereby realizing the cyclic heat dissipation driving action again.

[0023] For further information, see Figure 7 and Figure 10-14 The air cooling mechanism includes an air storage tank 6 disposed on the top of the base 3, a valve seat 63 at the output end of the air storage tank 6, a valve core 61 matching the valve seat 63, and a tension spring 62 clamped between the valve core 61 and the valve seat 63; The output end of the valve seat 63 is also connected to a connecting pipe 71, and the inner wall of the oil cylinder 1 is also provided with a second air channel 701, and a heat-conducting rod 7 is inserted in the second air channel 701. The heat-conducting rod 7 is an L-shaped copper structure, and one end of the heat-conducting rod 7 away from the second air channel 701 passes through the connecting pipe 71 and extends into the valve seat 63. A heat-conducting seat 74 is fixed to the end of the heat-conducting rod 7 in the valve seat 63, and a limiting sleeve 75 is fixed to the top of the heat-conducting seat 74. An expansion bag 73 is fixed in the limiting sleeve 75. The tension spring 62 has the elastic force to drive the valve core 61 to move down to fit the upper port of the valve seat 63, and the expansion bag 73 is filled with carbon dioxide gas. An air bin 421 is provided at the bottom of the outer tube body 42, and a release port 702 is also provided on one side of the second air channel 701. The second air channel 701 is connected to the air bin 421 through the release port 702. An air hole 425 connected to the air bin 421 is provided at the bottom of the outer air groove 424. The output end of the air hole 425 has a smaller aperture than the output end. An air guide groove 426 is also provided at the top of the outer air groove 424.

[0024] When the working temperature of the outer wall of the oil cylinder 1 is stable, the temperature introduced into the expansion bag 73 by the heat conducting rod 7 is insufficient to expand the expansion bag 73. At this time, the valve core 61 is attached to the upper end of the valve seat 63 by the tension spring 62 to keep the air storage tank 6 in a closed state; When the working temperature of the outer wall of the oil cylinder 1 is too high, the temperature introduced into the heat-conducting seat 74 by the heat-conducting rod 7 rises synchronously. At this time, the expansion bag 73 expands due to the heat, and then lifts the valve core 61, so that the valve core 61 overcomes the elastic force of the tensioning spring 62 and moves upward. At this time, the valve seat 63 is in an open state, and the pressurized gas stored in the gas storage tank 6 is discharged into the gas warehouse 421 through the valve seat 63, the connecting pipe 71, the second air channel 701, and the release port 702, and is discharged upward into the outer gas groove 424 through the air hole 425. Since the discharge port of the air hole 425 is designed to be narrow, the pressurized gas can quickly flow out of the narrow mouth of the air hole 425 and quickly diffuse into the outer gas groove 424. According to the principles of thermodynamics, the internal energy of the gas is dispersed during the rapid expansion of the gas, resulting in a drop in temperature, which can accelerate the heat exchange in the outer gas groove 424. At the same time, the upward-moving gas can be guided by the air guide groove 426 to dissipate the heat to the heat dissipating fins 123.

[0025] For further information, see Figure 7 and Figure 10-16 A cylinder 5 is also provided on the top of the base 3, and a secondary piston rod 51 matching the cylinder 5 is fixed to the bottom of the base 3. A one-way exhaust valve 52 and a one-way air intake valve 53 are provided at the bottom of the cylinder 5. The one-way exhaust valve 52 is connected to the air storage tank 6. A third air channel 54 is also provided on one side of the top of the cylinder 5. A first air channel 31 is also provided in the base 3. The input end of the first air channel 31 is connected to the output end of the third air channel 54, and the output end of the first air channel 31 is arranged opposite to the bottom of the external air groove 424.

[0026] When the main piston rod 2 moves upward in the oil cylinder 1, it drives the auxiliary piston rod 51 to squeeze the air at the top of the cylinder 5, and discharges it into the first air channel 31 through the third air channel 54, so as to cool the liquid cooling mechanism 4 and the heat dissipation fins 123 by air. When the main piston rod 2 moves downward in the oil cylinder 1, the gravity of the object lifted by the main piston rod 2 can be used to press the main piston rod 2 downward. At this time, the auxiliary piston rod 51 squeezes the air in the cylinder 5 into the air storage tank 6. When the oil cylinder 1 is not working and generating heat, the air storage tank 6 is automatically filled with pressurized air to store spare pressurized air for the next recycling.

[0027] The present invention achieves heat exchange and heat dissipation by alternately circulating the coolant in the inner liquid tank 423 through the mutual cooperation between the inner tube body 41 with the paddle 411 and the outer tube body 42 with the inner liquid tank 423, and utilizes the oil pressure of the oil cylinder 1 to drive the main piston rod 2 to move up and down, thereby driving the outer tube body 42 to rotate back and forth relative to the inner tube body 41, and can effectively reduce the cylinder body temperature of the oil cylinder 1 when it is working, and prevent the seals in the hydraulic system from being deformed, aged or failed due to excessive temperature, thereby causing leakage and performance degradation of the hydraulic system, thereby effectively improving the service life and operating stability of the hydraulic system, having market prospects and being suitable for popularization and application.

[0028] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A hydraulic oil automatic circulation cooling cylinder, comprising a cylinder (1), a base (3) fixed to the bottom of the cylinder (1), a main piston rod (2) slidably connected to the top of the cylinder (1), characterized in that: The outer wall of the oil cylinder (1) is provided with a liquid cooling mechanism (4) for liquid cooling and heat dissipation of the cylinder body of the oil cylinder (1); The liquid cooling mechanism (4) comprises an inner tube body (41) and an outer tube body (42); the inner tube body (41) is fixedly sleeved on the outer wall of the oil cylinder (1) by means of heat-conducting silicone; the outer tube body (42) is rotatably sleeved on the outer side of the inner tube body (41); the upper and lower ends of the outer tube body (42) and the inner tube body (41) are sealed by means of a sealing ring; a plurality of shifting plates (411) are evenly fixed on the outer wall of the inner tube body (41); the inner wall of the outer tube body (42) is provided with inner liquid grooves (423) corresponding to the inner tube body (41); the outer wall of the outer tube body (42) is provided with an outer gas groove (424) between two adjacent inner liquid grooves (423); the shifting plates (411) separate the inner liquid groove (423) into a first liquid cavity (4231) and a second liquid cavity (4232); and elastic capsules are provided in the first liquid cavity (4231) and the second liquid cavity (4232); A reflux chamber (12) is provided at the top of the oil cylinder (1), the reflux chamber (12) is filled with cooling liquid, a heat dissipation fin (123) is fixed to one side of the outer wall of the reflux chamber (12), the reflux chamber (12) comprises a first reflux groove (121) and a second reflux groove (122), the first reflux groove (121) is connected to the elastic sac of the first liquid chamber (4231), and the second reflux groove (122) is connected to the elastic sac of the second liquid chamber (4232); The oil cylinder (1) is also provided with a driving mechanism for driving the outer tube body (42) to reciprocate relative to the inner tube body (41) and an air cooling mechanism for providing heat dissipation air for the outer air groove (424).

2. The hydraulic oil automatic circulation cooling cylinder according to claim 1, characterized in that: The driving mechanism comprises an oil chamber (11) arranged at the top of the oil cylinder (1), a sliding ring (8) is slidably connected in the oil chamber (11) in a vertical direction, a torsion spring (81) is fixed between the top of the sliding ring (8) and the oil chamber (11), an upper magnetic ring (82) is fixed at the bottom of the sliding ring (8), and the upper magnetic ring (82) comprises a plurality of adjacent magnetic blocks with different magnetic properties; A lower magnetic ring (422) is fixed on the top of the outer tube body (42), and the lower magnetic ring (422) comprises a plurality of adjacent magnetic blocks with different magnetic properties.

3. The hydraulic oil automatic circulation cooling cylinder according to claim 2, characterized in that: The outer wall of the oil cylinder (1) is provided with a retracting oil circuit (101) and a lifting oil circuit (102); the output end of the retracting oil circuit (101) extends into the oil cylinder (1) and is arranged at the top of the piston of the main piston rod (2); the output end of the lifting oil circuit (102) extends into the oil cylinder (1) and is arranged at the bottom of the piston of the main piston rod (2); The output end of the retraction oil circuit (101) is further branched and extends into the oil chamber (11) and is arranged on a side of the sliding ring (8) away from the torsion spring (81).

4. The hydraulic oil automatic circulation cooling cylinder according to claim 1, characterized in that: The air cooling mechanism comprises an air storage tank (6) arranged on the top of the base (3), a valve seat (63) at the output end of the air storage tank (6), a valve core (61) matching the valve seat (63) being provided on the valve core (61), and a tension spring (62) being clamped between the valve core (61) and the valve seat (63); The output end of the valve seat (63) is also connected to a connecting pipe (71), and the inner wall of the oil cylinder (1) is also provided with a second air channel (701), a heat-conducting rod (7) is inserted into the second air channel (701), and one end of the heat-conducting rod (7) away from the second air channel (701) passes through the connecting pipe (71) and extends into the valve seat (63), a heat-conducting seat (74) is fixed to the end of the heat-conducting rod (7) in the valve seat (63), a limiting sleeve (75) is fixed to the top of the heat-conducting seat (74), and an expansion bag (73) is fixed in the limiting sleeve (75).

5. The hydraulic oil automatic circulation cooling cylinder according to claim 4, characterized in that: The tension spring (62) has an elastic force that drives the valve core (61) to move downward to fit the upper port of the valve seat (63).

6. The hydraulic oil automatic circulation cooling cylinder according to claim 4, characterized in that: The expansion bag (73) is filled with carbon dioxide gas.

7. The hydraulic oil automatic circulation cooling cylinder according to claim 4, characterized in that: An air bin (421) is provided at the bottom of the outer tube body (42), a release port (702) is also provided on one side of the second air channel (701), the second air channel (701) is connected to the air bin (421) via the release port (702), and an air hole (425) connected to the air bin (421) is provided at the bottom of the outer air groove (424).

8. The hydraulic oil automatic circulation cooling cylinder according to claim 7, characterized in that: The output end of the air hole (425) has a smaller aperture than the output end, and the top of the outer air groove (424) is also provided with an air guide groove (426).

9. The hydraulic oil automatic circulation cooling cylinder according to claim 4, characterized in that: A cylinder (5) is also provided on the top of the base (3), a secondary piston rod (51) matching the cylinder (5) is fixed on the bottom of the base (3), a one-way exhaust valve (52) and a one-way air intake valve (53) are provided on the bottom of the cylinder (5), and the one-way exhaust valve (52) is connected to the air storage tank (6).

10. The hydraulic oil automatic circulation cooling cylinder according to claim 9, characterized in that: A third air channel (54) is also provided on one side of the top of the cylinder (5), and a first air channel (31) is also provided in the base (3), the input end of the first air channel (31) is connected to the output end of the third air channel (54), and the output end of the first air channel (31) is arranged opposite to the bottom of the outer air groove (424).

Images