Hydraulic oil cylinder cooling system and hydraulic oil cylinder thereof

Abstract

The invention belongs to the technical field of hydraulic system cooling, and discloses a hydraulic oil cylinder cooling system and a hydraulic oil cylinder thereof.The hydraulic oil cylinder cooling system comprises an oil tank and a third pump body, and hydraulic oil in the oil tank is injected into the hydraulic cylinder through the third pump body; an oil outlet of the hydraulic cylinder communicates with the liquid cooling heat exchanger and the second compensation system, the second compensation system is used for distributing part of hydraulic oil for temporary storage when the hydraulic cylinder outputs high pressure, and the output end of the second compensation system communicates with the liquid cooling heat exchanger and is used for compensating input pressure of the liquid cooling heat exchanger when the hydraulic cylinder outputs low pressure. The pressure of the oil inlet is balanced through the compensation system II. The first compensation system can also be used for balancing the pressure at the oil inlet. The system can effectively utilize the cooling power of the liquid cooling heat exchanger and reduce the loss of the cooling power. And hydraulic oil can be shunted under the condition of large load and large flow so as to balance the pressure of a cooling system.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic system cooling, and specifically relates to a hydraulic cylinder cooling system and a hydraulic cylinder thereof. Background Art

[0002] During the operation of hydraulic machinery, when dealing with large-load systems, a large amount of heat is generated in the hydraulic oil system, and this heat needs to be dissipated. Generally, when dissipating heat from the hydraulic system of large machinery, it is difficult to effectively exchange heat only through the air-cooling system. Therefore, a liquid-cooled heat exchanger is often required for cooling. However, the working load of the hydraulic system is changing. During the mechanical action process, the oil return amount is relatively large. While during the action waiting process, the oil return amount is relatively small. And under high load, the load borne by each valve body in the system will also increase, which easily leads to defects such as valve body or cooling system failures. Also, when the oil return amount is relatively small, a large amount of the cooling power of the heat exchanger will be lost. When the oil return amount is large, the heat dissipation power of the heat exchanger cannot meet the heat dissipation requirements.

[0003] This application proposes a hydraulic cylinder cooling system to overcome the above-mentioned defects. Summary of the Invention

[0004] To solve the problems raised in the above background art, the present invention provides a hydraulic cylinder cooling system and a hydraulic cylinder thereof.

[0005] To achieve the above object, the present invention provides the following technical solution: A hydraulic cylinder cooling system and a hydraulic cylinder thereof, including an oil tank and a pump three. The hydraulic oil in the oil tank is injected into the hydraulic cylinder through the pump three. It also includes a compensation system one and a compensation system two. The oil outlet of the hydraulic cylinder is respectively connected to the liquid-cooled heat exchanger and the compensation system two. The compensation system two is used to divert a part of the hydraulic oil for temporary storage when the hydraulic cylinder outputs at high pressure. The output end of the compensation system two is connected to the liquid-cooled heat exchanger, and is used to compensate the input pressure of the liquid-cooled heat exchanger when the hydraulic cylinder outputs at low pressure. The output end of the liquid-cooled heat exchanger is connected to the compensation system one and forms a closed-loop circuit with the compensation system one. The compensation system one is used to compensate the input pressure of the liquid-cooled heat exchanger when the hydraulic cylinder outputs at low pressure.

[0006] Preferably, the compensation system one includes a hydraulic oil filtration chamber for filtering hydraulic oil, a pump one for transporting the hydraulic oil to the oil tank, a pump three for transporting the hydraulic oil in the hydraulic oil filtration chamber to the liquid-cooled heat exchanger, and the output end of the liquid-cooled heat exchanger is connected to the hydraulic oil filtration chamber.

[0007] Preferably, the first compensation system further includes a thermometer disposed on the hydraulic oil filtration chamber, and a check valve is disposed on the pipelines of the pump body three and the liquid-cooled heat exchanger.

[0008] Preferably, the second compensation system includes a buffer oil tank communicated with the hydraulic cylinder. The buffer oil tank is communicated with an air pump through an air guide pipe. The air pump injects air to dissipate heat from the hydraulic oil therein or pump the hydraulic oil to the liquid-cooled heat exchanger. The output end of the buffer oil tank and the output end of the hydraulic cylinder are transported in parallel to the liquid-cooled heat exchanger through a manifold.

[0009] Preferably, a throttle valve and a stop valve are disposed on the pipeline between the output end of the hydraulic cylinder and the input end of the buffer oil tank, and a first pressure gauge is disposed on the pipeline between the output end of the buffer oil tank and the input end of the manifold. An electromagnetic valve is disposed on the pipeline where the air cavity inside the buffer oil tank outputs to the external environment. When the electromagnetic valve is opened, the buffer oil tank air-cools the hydraulic oil. When the electromagnetic valve is closed, the buffer oil tank pumps the hydraulic oil.

[0010] Preferably, a second pressure gauge is disposed on the main return pipeline between the pump body three and the hydraulic cylinder.

[0011] Preferably, the buffer oil tank includes a cylinder column, and oil ports, an air inlet, and an air outlet disposed on both end covers. An elastic diaphragm is further disposed inside the cylinder column for storing hydraulic oil. The air inlet, the air outlet, and the inner cavity of the cylinder column form an air flow circulation channel for initially cooling the hydraulic oil in the elastic diaphragm. The air inlet is communicated with the air pump, and the air outlet is communicated with the electromagnetic valve. The oil port is communicated with the elastic diaphragm, and the oil port is respectively communicated with the output end of the hydraulic cylinder and the input end of the manifold.

[0012] Preferably, the elastic diaphragm is of a multi-chamber configuration, and each chamber is communicated with each other. Adjacent two chambers are separated and compressed by a partition plate. Except for the partition plates at the ends, the partition plates in the middle are provided with through holes for communicating the chambers of each elastic diaphragm.

[0013] Preferably, a first air duct and a second air duct are respectively disposed at the two radial ends of the inner cavity of the cylinder column. The first air duct and the second air duct are both uniformly provided with waist-shaped holes for air ventilation. The end of the second air duct is communicated with the air outlet. A telescopic isolation sleeve is sleeved on the surface of the end of the second air duct close to the air outlet, and the end of the telescopic isolation sleeve is connected to the partition plate close to the air outlet end.

[0014] A hydraulic cylinder, which is a differential circuit hydraulic cylinder and is applied to the above hydraulic cooling system.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The hydraulic oil pump pumps hydraulic oil into the hydraulic cylinder. In the working feed state, the hydraulic oil enters the circulation circuit. When the oil return volume of the system is large, the excess oil volume will enter the compensation system II for temporary storage. When the oil return flow rate is low, in order to compensate the inlet pressure of the liquid-cooled heat exchanger, the hydraulic oil in the compensation system II is pumped out to balance the inlet pressure of the liquid-cooled heat exchanger. When the stored hydraulic oil in the compensation system II is insufficient, the compensation system I can also be used to balance the pressure at the inlet of the liquid-cooled heat exchanger. The above system can effectively utilize the cooling power of the liquid-cooled heat exchanger and reduce the cooling power loss. And it can divert the hydraulic oil under large load and large flow conditions to balance the pressure of the cooling system.

[0016] The buffer oil tank is a chamber for storing the diverted hydraulic oil. An air flow can be injected into this chamber to press the hydraulic oil outwards. When the output channel of the air flow is opened, a heat exchange can be formed between the air flow and the hydraulic oil to take out the heat on the hydraulic oil, achieving a preliminary cooling effect. When the output pressure of the hydraulic cylinder is low, the air pump pumps air into the buffer oil tank and closes the air leakage channel to press the hydraulic oil in the buffer oil tank outwards. It flows in parallel with the hydraulic oil output from the hydraulic cylinder through the manifold and is injected into the inlet of the liquid-cooled heat exchanger to ensure the pressure balance at its inlet, and its cooling power will not be significantly lost. It can achieve a preliminary cooling effect on the hydraulic oil, improving the cooling efficiency of the entire cooling system.

[0017] The elastic diaphragm is set as a multi-chamber mechanism. This multi-chamber structure can make the partition between each chamber apply a more uniform pressure to the elastic diaphragm when the elastic diaphragm is compressed by pressure, thereby promoting the uniform compression of each part of the elastic diaphragm. Compared with a single oil chamber, its uniformity in heat dissipation and pressure bearing is better. Brief Description of the Drawings

[0018] Figure 1 It is the system structure diagram of the present invention.

[0019] Figure 2 It is the structural schematic diagram of the buffer oil tank of the present invention.

[0020] Figure 3 It is the front view of the buffer oil tank of the present invention.

[0021] Figure 4 It is the internal sectional view of the buffer oil tank of the present invention.

[0022] Figure 5 It is the compression schematic diagram of the elastic diaphragm in the buffer oil tank of the present invention.

[0023] Figure 6Schematic diagram of the distribution of the elastic diaphragm of the present invention in the cylinder column.

[0024] Figure 7 Cross-sectional schematic diagram of the partition plate and air duct of the present invention.

[0025] Figure 8 Schematic diagram of the structure of the elastic diaphragm of the present invention.

[0026] Figure 9 Cross-sectional schematic diagram of the elastic diaphragm of the present invention.

[0027] Figure 10 Schematic diagram of the structure of the partition plate of the present invention.

[0028] In the figure: 100, Compensation system one; 101, Hydraulic oil filtration chamber; 102, Pump body one; 103, Thermometer; 104, Pump body three; 200, Compensation system two; 201, Buffer oil tank; 2011, Cylinder column; 2012, Oil port; 2013, Air inlet; 2014, Air outlet; 2015, Elastic diaphragm; 2016, Air duct one; 2017, Air duct two; 2018, Partition plate; 2019, Telescopic isolation sleeve; 202, Air pump; 203, Throttle valve; 204, Pressure gauge one; 205, Collector; 300, Oil tank; 400, Pump body three; 500, Pressure gauge two; 600, Liquid cooling heat exchanger; 700, Hydraulic cylinder. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 10 shown, the present invention provides a hydraulic cylinder cooling system and its hydraulic cylinder, including an oil tank 300 and a pump body three 400. The hydraulic oil in the oil tank 300 is injected into the hydraulic cylinder 700 through the pump body three 400. It also includes a compensation system one 100 and a compensation system two 200. The oil outlet of the hydraulic cylinder 700 is respectively connected to the liquid cooling heat exchanger 600 and the compensation system two 200. The compensation system two 200 is used to divert a part of the hydraulic oil for temporary storage when the hydraulic cylinder 700 outputs at a high pressure. The output end of the compensation system two 200 is connected to the liquid cooling heat exchanger 600, and is used to compensate the input pressure of the liquid cooling heat exchanger 600 when the hydraulic cylinder 700 outputs at a low pressure. The output end of the liquid-cooled heat exchanger 600 is connected to the first compensation system 100 and forms a closed-loop circuit with the first compensation system 100. The first compensation system 100 is used to compensate the input pressure of the liquid-cooled heat exchanger 600 when the output pressure of the hydraulic cylinder 700 is low.

[0031] The hydraulic oil pump pumps hydraulic oil into the hydraulic cylinder 700. In the working feed state, the hydraulic oil enters the circulation circuit. When the oil return volume of the system is large, the excess oil volume will enter the second compensation system 200 for temporary storage. When the oil return flow is low, in order to compensate the inlet pressure of the liquid-cooled heat exchanger 600, the hydraulic oil in the second compensation system 200 is pumped out to balance the inlet pressure of the liquid-cooled heat exchanger 600.

[0032] When the stored hydraulic oil in the second compensation system 200 is insufficient, the first compensation system 100 can also be used to balance the pressure at the inlet of the liquid-cooled heat exchanger 600.

[0033] As Figure 1 shown, the first compensation system 100 includes a hydraulic oil filtration chamber 101 for filtering hydraulic oil, a first pump body 102 for transporting the hydraulic oil to the fuel tank 300, a third pump body 104 for transporting the hydraulic oil in the hydraulic oil filtration chamber 101 to the liquid-cooled heat exchanger 600, and the output end of the liquid-cooled heat exchanger 600 is connected to the hydraulic oil filtration chamber 101.

[0034] The first compensation system 100 and the second compensation system 200 are two systems for balancing the inlet pressure of the liquid-cooled heat exchanger 600. Generally, the two systems are in an alternative startup state, and the second compensation system 200 has a higher priority. When the second compensation system 200 outputs oil to compensate the inlet pressure of the liquid-cooled heat exchanger 600, the first compensation system 100 does not start. When the hydraulic oil stored in the second compensation system 200 is not enough to compensate the inlet pressure of the liquid-cooled heat exchanger 600, the first compensation system 100 starts to compensate its inlet pressure.

[0035] The third pump body 104 is a variable hydraulic pump and can adjust the output power.

[0036] As Figure 1 shown, the first compensation system 100 further includes a thermometer 103 arranged on the hydraulic oil filtration chamber 101, and check valves are arranged on the pipelines of the third pump body 104 and the liquid-cooled heat exchanger 600.

[0037] The thermometer 103 can obtain the temperature of the hydraulic oil in the hydraulic oil filtration chamber 101. When the temperature of the hydraulic oil is relatively high after the first cooling, it can be injected into the liquid-cooled heat exchanger 600 again through the circuit for cooling. This check valve is an elastic check valve.

[0038] As Figure 1As shown, the compensation system two 200 includes a buffer oil tank 201 communicated with a hydraulic cylinder 700. The buffer oil tank 201 is communicated with an air pump 202 through an air guide pipe. The air pump 202 injects air to dissipate heat from the hydraulic oil therein or pump the hydraulic oil to a liquid-cooled heat exchanger 600. The output end of the buffer oil tank 201 and the output end of the hydraulic cylinder 700 are transported in parallel through a manifold 205 to the liquid-cooled heat exchanger 600.

[0039] The buffer oil tank 201 can balance the pressure at the oil port of the liquid-cooled heat exchanger 600 when the output pressure of the hydraulic cylinder 700 is relatively large, and plays a certain protective role for the valves in the passage.

[0040] The buffer oil tank 201 is a chamber for storing the shunted hydraulic oil. An air flow can be injected into this chamber to press the hydraulic oil outwards. When the output channel of the air flow is opened, a heat exchange can be formed between the air flow and the hydraulic oil to take out the heat on the hydraulic oil, achieving a preliminary cooling effect.

[0041] When the output pressure of the hydraulic cylinder 700 is relatively low, the air pump 202 pumps air into the buffer oil tank 201, closes the air leakage channel, and presses the hydraulic oil in the buffer oil tank 201 outwards. It flows in parallel with the hydraulic oil output from the hydraulic cylinder 700 through the manifold 205 and is injected into the oil inlet of the liquid-cooled heat exchanger 600 to ensure the pressure balance at its oil inlet, and its cooling power will not be lost significantly.

[0042] The buffer oil tank 201 can achieve a preliminary cooling effect on the hydraulic oil, improving the cooling efficiency of the entire cooling system.

[0043] As Figure 1 shown, a throttle valve 203 and a stop valve are provided on the pipeline between the output end of the hydraulic cylinder 700 and the input end of the buffer oil tank 201. A pressure gauge one 204 is provided on the pipeline between the output end of the buffer oil tank 201 and the input end of the manifold 205; An electromagnetic valve is provided on the output pipeline of the air cavity inside the buffer oil tank 201 to the external environment. When the electromagnetic valve is opened, the buffer oil tank 201 performs air cooling on the hydraulic oil; When the electromagnetic valve is closed, the buffer oil tank 201 pumps the hydraulic oil.

[0044] When the output pressure of the hydraulic cylinder 700 is relatively large, the cooling system opens the stop valve and shunts a part of the hydraulic oil of the hydraulic cylinder 700 into the buffer oil tank 201. An air cavity is also provided in the buffer oil tank 201. The hydraulic oil entering the buffer oil tank 201 is in an isolated state from the air cavity, but a heat exchange can be formed with the air cavity. The air flow in the air cavity of the buffer oil tank 201 performs air cooling on the hydraulic oil.

[0045] When the solenoid valve closes, the flow of air in it is cut off from the outer channel. Thus, the continuous pumping of air causes the internal pressure to increase, and then the hydraulic oil inside is forced outwards.

[0046] As Figure 1 shown, a pressure gauge II 500 is provided on the main return circuit of the pump body III 400 and the hydraulic cylinder 700.

[0047] If the usage environment of the hydraulic cylinder is a load-sensitive system, pressure gauges need to be provided at both the inlet and outlet ports to obtain accurate pressure. If it is not a load-sensitive system, a pressure gauge is provided at the inlet port to estimate the output pressure of the outlet port.

[0048] The cooling system of this application can be applicable to these two environments.

[0049] As Figures 3 - 5 shown, the buffer oil tank 201 includes a cylinder column 2011 and oil ports 2012, an air inlet 2013, and an air outlet 2014 provided on both end covers. An elastic diaphragm 2015 is also provided inside the cylinder column 2011 for storing hydraulic oil. The air inlet 2013, the air outlet 2014, and the inner cavity of the cylinder column 2011 form an air flow circulation channel for initially cooling the hydraulic oil in the elastic diaphragm 2015; The air inlet 2013 is connected to the air pump 202, and the air outlet 2014 is connected to the solenoid valve; The oil port 2012 is connected to the elastic diaphragm 2015, and the oil port 2012 is respectively connected to the output end of the hydraulic cylinder 700 and the input end of the current collector 205.

[0050] The cavity of the cylinder column 2011 is divided into two parts. That is, the part containing the elastic diaphragm 2015 is the oil cavity, and the part not containing the elastic diaphragm 2015 is the air cavity. In the following text, the cavity is distinguished by the oil cavity and the air cavity.

[0051] When the output pressure of the hydraulic cylinder 700 is relatively large, the cut-off valve on the flow-through channel between the hydraulic cylinder 700 and the buffer oil tank 201 is opened, and thus a part of the hydraulic oil is diverted into the buffer oil tank 201. The hydraulic oil enters the buffer oil tank 201 and is injected into the elastic diaphragm 2015. The setting of the elastic diaphragm 2015 can make it not completely occupy the inner cavity of the cylinder column 2011 during expansion, and form two parts, namely the oil cavity and the air cavity. The cold air flow is pumped into the air cavity and circulates in it, which can directly exchange heat with the elastic diaphragm 2015 and form a cooling path with the external environment, constituting the main body of initial cooling.

[0052] When the output pressure of the hydraulic cylinder 700 is relatively small, the flow-through channel between the air in the buffer oil tank 201 and the external environment is closed, the pressure of the air cavity is increased, and the elastic diaphragm 2015 is squeezed to press out the hydraulic oil in the oil cavity and merge it with the output oil of the hydraulic cylinder 700.

[0053] Therefore, the buffer oil tank 201 can not only balance the pressure at the input end of the liquid-cooled heat exchanger 600, but also play a role in preliminary cooling.

[0054] A damping valve can be provided between the communication passage between the hydraulic cylinder 700 and the collector 205 to control the maximum flow rate, so that when the output pressure is high, the hydraulic oil can be quantitatively passed through, and the other part of the oil pressure can be transferred to the buffer oil tank 201. However, this design requires an additional pressure gauge to be provided at the oil outlet of the hydraulic cylinder 700 to reflect the actual pressure.

[0055] like Figures 4 - 6 and Figure 8 As shown, the elastic membrane 2015 is a multi-cavity configuration, each cavity is interconnected, and two adjacent cavities are separated and pushed by a partition 2018; Except for the partitions 2018 located at the ends, the partitions 2018 located in the middle are provided with through holes for connecting the cavities of each elastic membrane 2015 .

[0056] In this embodiment, the elastic membrane 2015 is configured as a multi-cavity structure, and the multi-cavity structure enables the partitions 2018 separating the cavities to apply more uniform pressure to the elastic membrane 2015 when the elastic membrane 2015 is compressed, thereby promoting uniform compression of each part of the elastic membrane 2015. Compared with a single oil cavity, it has better uniformity in heat dissipation and pressure bearing.

[0057] like Figure 4 and Figure 5 As shown, an annular flow channel is formed between two adjacent partitions 2018 and the elastic membrane 2015, and the pumped air flow can flow through the flow channel to take away the heat on the surface of the elastic membrane 2015, thereby cooling the hydraulic oil, and then being discharged outward through air circulation.

[0058] When the discharge channel is blocked, positive pressure is formed inside, and the partition 2018 is pressed against the surface of the elastic membrane 2015, thereby compressing the elastic membrane 2015 and pressing the hydraulic oil outward.

[0059] The hydraulic oil flows out through the pressure gauge 204 to measure the hydraulic pressure, which is used to feed back to the controller to adjust the pumping power of the air pump 202, and then flows in parallel with the output hydraulic oil of the hydraulic cylinder 700 at the collector 205 to the liquid cooling heat exchanger 600. The hydraulic oil output by the hydraulic cylinder 700 flows in parallel with the hydraulic oil output by the buffer oil tank 201, and can be initially cooled.

[0060] like Figures 4 - 6As shown, on the radial two ends of the inner cavity of the cylinder column 2011, there are respectively a first air duct 2016 and a second air duct 2017. On both the first air duct 2016 and the second air duct 2017, there are evenly distributed kidney-shaped holes for ventilation. The end of the second air duct 2017 is communicated with the air outlet 2014; A telescopic isolation sleeve 2019 is sleeved on the surface of the end of the second air duct 2017 close to the air outlet 2014. One end of the telescopic isolation sleeve 2019 is connected to the partition plate 2018 at the end close to the air outlet 2014.

[0061] In this embodiment, the kidney-shaped holes on both the first air duct 2016 and the second air duct 2017 have the same specifications and are arranged at equal distances. The air flow is pumped into the cylinder column 2011 through the air inlet 2013 and can flow into the first air duct 2016 through the kidney-shaped holes. The part of the second air duct 2017 located in the air cavity is covered by the telescopic isolation sleeve 2019. Therefore, when the gas is initially in the air cavity, it can only enter the first air duct 2016 through the kidney-shaped holes on the first air duct 2016, and then the gas is guided to the kidney-shaped holes of the second air duct 2017 in the oil cavity through the flow path formed between the first air duct 2016, the elastic diaphragm 2015 and the partition plate 2018. If at this time the external solenoid valve is in the conducting state, the input air flow will pass through the above flow path and then be discharged through the solenoid valve, and the heat therein will be discharged accordingly. It can cool down the hydraulic oil.

[0062] If the solenoid valve is in the cut-off state, the pumped gas forms a positive pressure inside, as Figure 5 shown, compressing the elastic diaphragm 2015, pressing out the hydraulic oil in the elastic diaphragm 2015 from the buffer oil tank 201, flowing through the pressure gauge 204 to measure the hydraulic pressure, so as to feedback to the controller to adjust the pumping power of the air pump 202, and then the output hydraulic oil of the hydraulic cylinder 700 is merged and transported to the liquid-cooled heat exchanger 600 at the collector 205.

[0063] The hydraulic cylinder applied to this cooling system is a differential circuit hydraulic cylinder.

[0064] The working principle and usage process of the present invention: The hydraulic oil is pumped into the hydraulic cylinder 700. In the working feed state, the hydraulic oil enters the circulation circuit. When the oil return amount of the system is large, the excess oil will enter the compensation system two 200 for temporary storage. When the oil return flow is low, in order to compensate the inlet pressure of the liquid-cooled heat exchanger 600, the hydraulic oil in the compensation system two 200 is pumped out to balance the inlet pressure of the liquid-cooled heat exchanger 600. When the stored hydraulic oil in the compensation system two 200 is insufficient, the compensation system one 100 can also be used to balance the pressure at the inlet of the liquid-cooled heat exchanger 600.

[0065] Compensation system one 100 and compensation system two 200 are two systems for balancing the inlet pressure of the liquid-cooled heat exchanger 600. Generally, only one of the two systems is turned on, and compensation system two 200 has a higher priority. When the outlet oil of compensation system two 200 compensates the inlet pressure of the liquid-cooled heat exchanger 600, compensation system one 100 does not start. When the hydraulic oil stock in compensation system two 200 is insufficient to compensate the inlet pressure of the liquid-cooled heat exchanger 600, compensation system one 100 starts to compensate its inlet pressure.

[0066] The buffer oil tank 201 is a chamber for storing the diverted hydraulic oil. An air flow can be injected into this chamber to press the hydraulic oil outwards. When the output channel of the air flow is opened, a heat exchange can be formed between the air flow and the hydraulic oil to carry out the heat on the hydraulic oil, achieving a preliminary cooling effect.

[0067] The hydraulic oil enters the buffer oil tank 201 and is injected into the elastic diaphragm 2015. The elastic diaphragm 2015 is provided to ensure that it will not completely occupy the inner cavity of the cylinder column 2011 during expansion, and two parts, an oil cavity and an air cavity, are formed. The air cavity allows the pumped low-temperature air flow to circulate therein, enabling direct heat exchange with the elastic diaphragm 2015 and forming a cooling path with the external environment, constituting the main body of preliminary cooling. When the output pressure of the hydraulic cylinder 700 is small, the flow channel between the air flow in the buffer oil tank 201 and the external environment is closed, the pressure in the air cavity is increased, and the elastic diaphragm 2015 is squeezed to press the hydraulic oil in the oil cavity out of the buffer oil tank 201 to flow in parallel with the output oil of the hydraulic cylinder 700. Thus, the buffer oil tank 201 can not only balance the pressure at the input end of the liquid-cooled heat exchanger 600 but also play a role in preliminary cooling.

[0068] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0069] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made therein without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder cooling system and its hydraulic cylinder, comprising an oil tank (300) and a third pump body (400), wherein the hydraulic oil in the oil tank (300) is injected into the hydraulic cylinder (700) through the third pump body (400), and it is characterized in that: It also includes a compensation system 1 (100) and a compensation system 2 (200), The oil outlet of the hydraulic cylinder (700) is respectively connected to the liquid cooling heat exchanger (600) and the second compensation system (200); the second compensation system (200) is used to divert a portion of the hydraulic oil for temporary storage when the hydraulic cylinder (700) outputs at high pressure; the output end of the second compensation system (200) is connected to the liquid cooling heat exchanger (600) and is used to compensate for the input pressure of the liquid cooling heat exchanger (600) when the hydraulic cylinder (700) outputs at low pressure. The output end of the liquid-cooled heat exchanger (600) is connected to the compensation system (100) to form a closed loop with the compensation system (100). The compensation system (100) is used to compensate the input pressure of the liquid-cooled heat exchanger (600) when the output pressure of the hydraulic cylinder (700) is low.

2. The hydraulic cylinder cooling system and the hydraulic cylinder according to claim 1, characterized in that: The compensation system 1 (100) includes a hydraulic oil filter chamber (101) for filtering the hydraulic oil, a pump body 1 (102) for conveying the hydraulic oil to the oil tank (300), and a pump body 3 (104) for conveying the hydraulic oil in the hydraulic oil filter chamber (101) to the liquid-cooled heat exchanger (600). The output end of the liquid-cooled heat exchanger (600) is connected to the hydraulic oil filter chamber (101).

3. A hydraulic cylinder cooling system and its hydraulic cylinder according to claim 2, characterized in that: The compensation system one (100) further comprises a thermometer (103) arranged on the hydraulic oil filter chamber (101), and a one-way valve is arranged on the pipeline of the pump body three (104) and the liquid-cooled heat exchanger (600).

4. A hydraulic cylinder cooling system and its hydraulic cylinder according to any one of claims 1-3, characterized in that: The second compensation system (200) comprises a buffer oil tank (201) connected to the hydraulic cylinder (700); the buffer oil tank (201) is connected to an air pump (202) via an air guide pipe; the air pump (202) injects air to dissipate the heat of the hydraulic oil therein or to pressurize the hydraulic oil to the liquid-cooled heat exchanger (600); The output end of the buffer oil tank (201) and the output end of the hydraulic cylinder (700) are transported in parallel to the liquid-cooled heat exchanger (600) via the collector (205).

5. A hydraulic cylinder cooling system and its hydraulic cylinder according to claim 4, characterized in that: A throttle valve (203) and a stop valve are provided on the pipeline between the output end of the hydraulic cylinder (700) and the input end of the buffer oil tank (201), and a pressure gauge 1 (204) is provided on the pipeline between the output end of the buffer oil tank (201) and the input end of the collector (205); An electromagnetic valve is provided on a pipeline outputting the air cavity inside the buffer oil tank (201) to the external environment, and when the electromagnetic valve is opened, the buffer oil tank (201) performs air cooling on the hydraulic oil; When the solenoid valve is closed, the buffer oil tank (201) pressurizes the hydraulic oil.

6. The hydraulic cylinder cooling system and the hydraulic cylinder according to claim 5, characterized in that: A pressure gauge 2 (500) is provided on the main circuit between the pump body 3 (400) and the hydraulic cylinder (700).

7. A hydraulic cylinder cooling system and its hydraulic cylinder according to claim 5, characterized in that: The buffer oil tank (201) includes a cylinder column (2011), and oil ports (2012), an air inlet (2013), and an air outlet (2014) provided on both end covers. An elastic diaphragm (2015) is further provided inside the cylinder column (2011) for storing hydraulic oil. The air inlet (2013), the air outlet (2014), and the inner cavity of the cylinder column (2011) form an air flow circulation channel for initially cooling the hydraulic oil in the elastic diaphragm (2015). The air inlet (2013) is connected to the air pump (202), and the air outlet (2014) is connected to the solenoid valve. The oil port (2012) is connected to the elastic diaphragm (2015), and the oil port (2012) is respectively connected to the output end of the hydraulic cylinder (700) and the input end of the manifold (205).

8. A hydraulic cylinder cooling system and its hydraulic cylinder according to claim 7, characterized in that: The elastic diaphragm (2015) is of a multi-chamber configuration, and the chambers communicate with each other. Adjacent two chambers are separated and compressed by a partition (2018). Except for the partitions (2018) at the ends, the partitions (2018) in the middle are provided with through holes for communicating the chambers of each elastic diaphragm (2015).

9. A hydraulic cylinder cooling system and its hydraulic cylinder according to claim 8, characterized in that: Air ducts one (2016) and air ducts two (2017) are respectively provided at the radial two ends of the inner cavity of the cylinder column (2011). The air ducts one (2016) and the air ducts two (2017) are both uniformly provided with waist-shaped holes for ventilation. The end of the air ducts two (2017) is connected to the air outlet (2014). A telescopic isolation sleeve (2019) is sleeved on the surface of the end of the air ducts two (2017) close to the air outlet (2014), and the end of the telescopic isolation sleeve (2019) is connected to the partition (2018) at one end close to the air outlet (2014).

10. A hydraulic cylinder, characterized in that: This hydraulic cylinder is a differential circuit hydraulic cylinder, which is applied to the hydraulic cylinder cooling system as described in claim 1.

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