Bimetal cylinder body structure for axial plunger pump

Abstract

The invention discloses a bimetallic cylinder body structure for an axial plunger pump, and relates to the technical field of axial plunger pumps, the bimetallic cylinder body structure comprises an axial plunger pump cylinder body, the top of the axial plunger pump cylinder body is fixedly communicated with an oil inlet shell, the top of the oil inlet shell is fixedly communicated with an oil conveying pipe, one end of the oil conveying pipe is provided with a filtering and cooling mechanism, and the other end of the oil conveying pipe is provided with a cooling mechanism. The filtering and cooling mechanism comprises a filtering unit, the filtering unit is arranged at one end of the oil conveying pipe, and the filtering unit is used for filtering hydraulic oil input into an inner cavity of the axial plunger pump cylinder body. Hydraulic oil flowing to the axial plunger pump cylinder body can be filtered, abrasion of parts in an inner cavity of the axial plunger pump cylinder body caused by impurities in the hydraulic oil is avoided, meanwhile, the cooling unit is used for cooling the hydraulic oil, the viscosity of the hydraulic oil is increased, and the problems that the viscosity is reduced and leakage occurs due to heat generated by friction when the hydraulic oil flows are solved.

Description

Technical Field

[0001] The invention relates to the technical field of axial piston pumps, in particular to a bimetallic cylinder structure for axial piston pumps. Background Art

[0002] The axial piston pump is an inclined plate type axial piston pump that uses an oil distribution plate to distribute oil, a rotating cylinder, and a variable head to change its position. The pump adopts the optimal oil film thickness design of hydraulic static balance, so that the cylinder body and the oil distribution plate, the sliding shoe and the variable head are operated under pure liquid friction. It has the advantages of simple structure, small size, low noise, high efficiency, long life and self-priming ability. The axial piston pump has a variety of variable forms to meet the requirements of users. It is widely used in machine tools, forging, metallurgy, engineering, mining, ships and other machinery and other hydraulic transmission systems.

[0003] After long-term use, the existing axial piston pump will generate heat due to the friction of the hydraulic oil flowing inside the cylinder, thereby reducing the viscosity of the hydraulic oil. When the viscosity of the hydraulic oil is too low, the fluidity will increase, thereby increasing the risk of leakage between the seals and joints. For axial piston pumps, hydraulic oil leakage inside the cylinder will not only cause oil loss and reduce system efficiency, but may also cause environmental pollution and pose a threat to the safe operation of the equipment.

[0004] Combining the above problems, we will find that it is difficult to avoid the above problems at the same time when using the existing axial piston pumps on the market, and even if they can be solved, they need to be solved with the cooperation of external tools, which makes it impossible to achieve the desired effect. Therefore, we propose a bimetallic cylinder structure for axial piston pumps. Summary of the invention

[0005] The object of the present invention is to provide a bimetallic cylinder structure for an axial piston pump to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a bimetallic cylinder structure for an axial piston pump, comprising an axial piston pump cylinder, the top of the axial piston pump cylinder is fixedly connected to an oil inlet shell, the top of the oil inlet shell is fixedly connected to an oil delivery pipe, and one end of the oil delivery pipe is provided with a filtering and cooling mechanism;

[0007] The filtering and cooling mechanism comprises a filtering unit, which is arranged at one end of the oil delivery pipe and is used to filter the hydraulic oil input into the cylinder cavity of the axial piston pump;

[0008] The filtering and cooling mechanism further comprises a cooling unit, which is used in conjunction with the filtering unit and is used to cool the hydraulic oil;

[0009] A hydraulic oil viscosity detection device is provided on one side of the filtering and cooling mechanism. The hydraulic oil viscosity detection device is used in conjunction with the filtering and cooling mechanism, and is used to detect the viscosity of the hydraulic oil.

[0010] Preferably, the filter unit includes a positioning shell, the positioning shell is fixedly sleeved on the surface of the oil pipeline, the inner cavity of the positioning shell is provided with a limiting plate, the surface of the limiting plate is slidably connected to the inner wall of the positioning shell, four springs are provided on one side of the limiting plate, one end of the spring is fixedly connected to the inner wall of the positioning shell, the other end of the spring is fixedly connected to one side of the limiting plate, the other side of the limiting plate is provided with a filter element, one side of the filter element contacts the other side of the limiting plate, the top of the positioning shell is fixedly installed with a cover plate by bolts, one side of the positioning shell is fixedly connected to a first connecting pipe, one end of the first connecting pipe passes through the inner cavity of the positioning shell and is connected to the inner cavity of the filter element, a first solenoid valve is fixedly sleeved on the surface of the first connecting pipe, the other end of the first connecting pipe is fixedly connected to a first three-way pipe, one end of the first three-way pipe is fixedly connected to a second connecting pipe, one end of the second connecting pipe is fixedly connected to a second three-way pipe, and one end of the second three-way pipe is fixedly connected to an oil inlet pipe.

[0011] Preferably, two sealing rings are fixedly installed in the inner cavity of the positioning shell, one of the sealing rings is sleeved on the surface of the oil pipeline, and the other sealing ring is sleeved on the surface of the first connecting pipe.

[0012] Preferably, a sealing gasket is fixedly connected to the bottom of the cover plate, and a surface of the sealing gasket is in contact with the inner wall of the positioning shell.

[0013] Preferably, the cooling unit includes a shell and a serpentine tube, the shell is arranged at the bottom of the positioning shell, one end of the serpentine tube is fixedly connected to the inner cavity of the positioning shell, a second solenoid valve is fixedly sleeved on the surface of the serpentine tube, the serpentine tube is arranged in the inner cavity of the shell, the other end of the serpentine tube passes through the outside of the shell and is fixedly connected to a return pipe, one end of the return pipe is fixedly connected to the inner cavity of the second three-way pipe, a third solenoid valve is fixedly sleeved on the surface of the return pipe, a water inlet pipe and a water outlet pipe are fixedly connected to one side of the shell, and one end of the water inlet pipe and the water outlet pipe are fixedly connected to a flange.

[0014] Preferably, a temperature sensor is fixedly mounted on the surface of the shell, and one end of the temperature sensor penetrates into the inner cavity of the shell.

[0015] Preferably, the hydraulic oil viscosity detection device includes a guide tube and a positioning plate, the guide tube is fixedly connected to the inner cavity of the first three-way tube, the positioning plate is arranged on one side of the first three-way tube, a glass container and a positioning frame are fixedly installed on the top of the positioning plate, a water pump is fixedly installed on one side of the positioning frame, the output end of the water pump is fixedly connected to a drain pipe, the input end of the water pump is fixedly connected to a third connecting tube, one end of the third connecting tube is fixedly connected to the inner cavity of the guide tube, one end of the guide tube is fixedly connected to a viscosity tube, and the viscosity tube is arranged in the inner cavity of the glass container.

[0016] Preferably, a fourth solenoid valve is fixedly sleeved on the surface of the guide tube, and the fourth solenoid valve is located at the upper end of the first three-way tube.

[0017] Preferably, one side of the glass container is fixedly connected to a sewage pipe, and a manual valve is fixedly sleeved on the surface of the sewage pipe.

[0018] Preferably, one side of the viscosity tube is fixedly connected to an exhaust pipe, and a sealing plug is inserted into the surface of the exhaust pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention can filter the hydraulic oil flowing to the cylinder of the axial piston pump by setting a filter unit, thereby preventing impurities in the hydraulic oil from causing wear to the parts in the inner cavity of the cylinder of the axial piston pump. At the same time, the limit plate and the spring are used to facilitate the staff to disassemble and replace the filter element, thereby improving the stability of the use of the filter unit.

[0021] 2. The present invention can cool the hydraulic oil and increase the viscosity of the hydraulic oil by setting a cooling unit, so as to avoid the frictional heat generated when the hydraulic oil flows to reduce the viscosity and cause leakage. At the same time, the cooling water blocked in the inner cavity of the shell can be replaced by the water inlet pipe and the water outlet pipe, so that the cooling water can continuously cool the hydraulic oil.

[0022] 3. The present invention provides a hydraulic oil viscosity detection device to detect the viscosity of the hydraulic oil during the use of the axial piston pump cylinder, thereby preventing the hydraulic oil from leaking due to the hydraulic oil viscosity being too low and the fluidity being too high. After the detection is completed, the sealing plug is opened to allow air to enter the inner cavity of the viscosity tube, so that the hydraulic oil and water in the inner cavity can be discharged, thereby improving the maintenance efficiency of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a rear view of the overall structure of the present invention;

[0025] Figure 3It is a structural cross-sectional view of the cylinder body and filter cooling mechanism of the axial piston pump of the present invention;

[0026] Figure 4 It is a structural cross-sectional view of the filtering and cooling mechanism of the present invention;

[0027] Figure 5 It is a structural cross-sectional view of the filter unit of the present invention;

[0028] Figure 6 It is a structural cross-sectional view of the cooling unit of the present invention;

[0029] Figure 7 This is a structural breakdown diagram of the hydraulic oil viscosity detection device of the present invention.

[0030] In the figure: 1, axial piston pump cylinder; 11, oil inlet shell; 12, oil delivery pipe; 2, filter cooling mechanism; 21, filter unit; 2101, positioning shell; 2102, limit plate; 2103, spring; 2104, filter element; 2105, cover plate; 2106, first connecting pipe; 2107, first solenoid valve; 2108, first three-way pipe; 2109, second connecting pipe; 2110, second three-way pipe; 2111, oil inlet pipe; 2112, sealing ring; 2113, sealing pad; 22, cooling unit; 2201, shell; 2202, serpentine pipe ; 2203, second solenoid valve; 2204, reflux pipe; 2205, third solenoid valve; 2206, water inlet pipe; 2207, water outlet pipe; 2208, flange; 2209, temperature sensor; 3, hydraulic oil viscosity detection device; 301, guide pipe; 302, positioning plate; 303, glass container; 304, positioning frame; 305, water pump; 306, drain pipe; 307, third connecting pipe; 308, viscosity tube; 309, fourth solenoid valve; 310, sewage pipe; 311, manual valve; 312, exhaust pipe; 313, sealing plug. DETAILED DESCRIPTION

[0031] 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.

[0032] Example 1: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The present invention provides a technical solution: a bimetallic cylinder structure for an axial piston pump, comprising an axial piston pump cylinder 1, the top of the axial piston pump cylinder 1 is fixedly connected to an oil inlet shell 11, the top of the oil inlet shell 11 is fixedly connected to an oil delivery pipe 12, and one end of the oil delivery pipe 12 is provided with a filtering and cooling mechanism 2;

[0033] The filtering and cooling mechanism 2 comprises a filtering unit 21 . The filtering unit 21 is arranged at one end of the oil delivery pipe 12 . The filtering unit 21 is used for filtering the hydraulic oil input into the inner cavity of the axial piston pump cylinder 1 .

[0034] As a further limitation of the filtering and cooling mechanism 2 of the present invention, the filtering unit 21 includes a positioning shell 2101, the positioning shell 2101 is fixedly sleeved on the surface of the oil pipeline 12, the inner cavity of the positioning shell 2101 is provided with a limiting plate 2102, the surface of the limiting plate 2102 is slidably connected to the inner wall of the positioning shell 2101, one side of the limiting plate 2102 is provided with four springs 2103, one end of the spring 2103 is fixedly connected to the inner wall of the positioning shell 2101, the other end of the spring 2103 is fixedly connected to one side of the limiting plate 2102, a filter element 2104 is provided on the other side of the limiting plate 2102, one side of the filter element 2104 is in contact with the other side of the limiting plate 2102, a cover plate 2105 is fixedly installed on the top of the positioning shell 2101 by bolts, one side of the positioning shell 2101 is fixedly connected to a first connecting pipe 2106, and the first connecting pipe 2106 One end of the first connecting pipe 2106 passes through the inner cavity of the positioning shell 2101 and is connected with the inner cavity of the filter element 2104. A first solenoid valve 2107 is fixedly sleeved on the surface of the first connecting pipe 2106. The other end of the first connecting pipe 2106 is fixedly connected with a first three-way pipe 2108, one end of the first three-way pipe 2108 is fixedly connected with a second connecting pipe 2109, one end of the second connecting pipe 2109 is fixedly connected with a second three-way pipe 2110, and one end of the second three-way pipe 2110 is fixedly connected with an oil inlet pipe 2111. By setting up the filter unit 21, the hydraulic oil flowing to the axial piston pump cylinder body 1 can be filtered to prevent impurities in the hydraulic oil from causing wear to the parts of the inner cavity of the axial piston pump cylinder body 1. At the same time, the limit plate 2102 and the spring 2103 are used to cooperate to facilitate the staff to disassemble and replace the filter element 2104, thereby improving the stability of the use of the filter unit 21.

[0035] Two sealing rings 2112 are fixedly installed in the inner cavity of the positioning shell 2101, one of the sealing rings 2112 is sleeved on the surface of the oil pipe 12, and the other sealing ring 2112 is sleeved on the surface of the first connecting pipe 2106; by setting the sealing ring 2112, the oil pipe 12 and the first connecting pipe 2106 can be sealed, thereby improving the safety of the use of the positioning shell 2101.

[0036] A sealing gasket 2113 is fixedly connected to the bottom of the cover plate 2105, and the surface of the sealing gasket 2113 contacts the inner wall of the positioning shell 2101; by setting the sealing gasket 2113, the connection between the cover plate 2105 and the positioning shell 2101 can be avoided, thereby preventing the hydraulic oil from leaking out of the inner cavity of the positioning shell 2101.

[0037] The specific implementation of this embodiment is as follows: when in use, the hydraulic oil enters the inner cavity of the first connecting pipe 2106 through the oil inlet pipe 2111. Since the first connecting pipe 2106 is connected to the inner cavity of the filter element 2104, when the hydraulic oil enters the inner cavity of the filter element 2104, the filter element 2104 can be used to filter impurities in the hydraulic oil. The filtered hydraulic oil enters the inner cavity of the axial piston pump cylinder 1 through the positioning shell 2101, which can prevent impurities from causing wear to the internal parts of the axial piston pump cylinder 1. After the filter element 2104 has been used for a long time, the staff will disassemble the cover plate 2105 and pull one end of the filter element 2104 to move. When the filter element 2104 moves, the limit plate 2102 drives the spring 2103 to squeeze the filter element 2104. When one side of the filter element 2104 is out of contact with the first connecting pipe 2106, the filter element 2104 can be disassembled and replaced, thereby improving the maintenance efficiency of the staff.

[0038] Example 2: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 The present invention provides a technical solution: a bimetallic cylinder structure for an axial piston pump. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. The filtering and cooling mechanism 2 also includes a cooling unit 22. The cooling unit 22 is used in conjunction with the filtering unit 21. The cooling unit 22 is used to cool the hydraulic oil.

[0039] As a further limitation of the filtering and cooling mechanism 2 of the present invention, the cooling unit 22 includes a shell 2201 and a serpentine tube 2202, the shell 2201 is arranged at the bottom of the positioning shell 2101, one end of the serpentine tube 2202 is fixedly connected to the inner cavity of the positioning shell 2101, and a second solenoid valve 2203 is fixedly sleeved on the surface of the serpentine tube 2202, the serpentine tube 2202 is arranged in the inner cavity of the shell 2201, and the other end of the serpentine tube 2202 passes through the outer side of the shell 2201 and is fixedly connected to a return pipe 2204, and one end of the return pipe 2204 is fixedly connected to the inner cavity of the second three-way pipe 2110. A third solenoid valve 2205 is fixedly sleeved on the surface of the return pipe 2204, and a water inlet pipe 2206 and a water outlet pipe 2207 are fixedly connected to one side of the shell 2201, and one end of the water inlet pipe 2206 and the water outlet pipe 2207 are fixedly connected to a flange 2208; by setting up the cooling unit 22, the hydraulic oil can be cooled and the viscosity of the hydraulic oil can be increased, so as to avoid the friction of the hydraulic oil during the flow to reduce the viscosity and cause leakage, and at the same time, the water inlet pipe 2206 and the water outlet pipe 2207 can be used to replace the cooling water that blocks the inner cavity of the shell 2201, so that the cooling water can continue to cool the hydraulic oil.

[0040] A temperature sensor 2209 is fixedly installed on the surface of the shell 2201, and one end of the temperature sensor 2209 penetrates into the inner cavity of the shell 2201; by setting the temperature sensor 2209, it is convenient for the staff to monitor the water temperature in the inner cavity of the shell 2201, which is beneficial for the staff to replace and maintain the cooling water.

[0041] The specific implementation of this embodiment is as follows: when the viscosity of the hydraulic oil is too low, the staff uses an external control switch to close the first solenoid valve 2107 and open the second solenoid valve 2203. After the second solenoid valve 2203 is opened, the hydraulic oil in the inner cavity of the positioning shell 2101 flows into the inner cavity of the serpentine tube 2202. At this time, the cooling water in the inner cavity of the shell 2201 can reduce the temperature of the hydraulic oil in the inner cavity of the serpentine tube 2202, thereby increasing the viscosity of the hydraulic oil. While continuing to cool the hydraulic oil in the inner cavity of the serpentine tube 2202, the staff uses the temperature sensor to Sensor 2209 can monitor the cooling water temperature in the inner cavity of shell 2201. When the cooling water temperature is too high, the staff will drain the cooling water in the inner cavity of shell 2201 and inject new cooling water, so as to improve the cooling efficiency of hydraulic oil. The cooled hydraulic oil will flow back to the inner cavity of second three-way pipe 2110 through return pipe 2204. After the temperature of hydraulic oil is controlled, the second solenoid valve 2203 is closed by external control switch, and the first solenoid valve 2107 is started to resume the use of axial piston pump cylinder 1.

[0042] Example 3: Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 7The present invention provides a technical solution: a bimetallic cylinder structure for an axial piston pump. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. A hydraulic oil viscosity detection device 3 is provided on one side of the filtering and cooling mechanism 2. The hydraulic oil viscosity detection device 3 is used in conjunction with the filtering and cooling mechanism 2. The hydraulic oil viscosity detection device 3 is used to detect the viscosity of the hydraulic oil.

[0043] As a further limitation of the hydraulic oil viscosity detection device 3 of the present invention, the hydraulic oil viscosity detection device 3 includes a guide tube 301 and a positioning plate 302, the guide tube 301 is fixedly connected to the inner cavity of the first three-way tube 2108, the positioning plate 302 is arranged on one side of the first three-way tube 2108, a glass container 303 and a positioning frame 304 are fixedly installed on the top of the positioning plate 302, a water pump 305 is fixedly installed on one side of the positioning frame 304, the output end of the water pump 305 is fixedly connected to the drain pipe 306, the input end of the water pump 305 is fixedly connected to the third connecting pipe 307, and the third connecting pipe One end of 307 is fixedly connected to the inner cavity of the guide tube 301, and one end of the guide tube 301 is fixedly connected to the viscosity tube 308, and the viscosity tube 308 is arranged in the inner cavity of the glass container 303; by setting the hydraulic oil viscosity detection device 3, the viscosity of the hydraulic oil can be detected during the use of the axial piston pump cylinder 1 to avoid the hydraulic oil leakage caused by too low viscosity and high fluidity of the hydraulic oil. At the same time, after the detection is completed, the sealing plug 313 is opened to allow air to enter the inner cavity of the viscosity tube 308, so that the hydraulic oil and water in the inner cavity can be discharged, thereby improving the maintenance efficiency of the staff.

[0044] A fourth solenoid valve 309 is fixedly sleeved on the surface of the guide tube 301, and the fourth solenoid valve 309 is located at the upper end of the first three-way tube 2108; by setting the fourth solenoid valve 309, the guide tube 301 can be sealed, and when the fourth solenoid valve 309 is opened, the hydraulic oil can be discharged into the inner cavity of the viscosity tube 308 for detection.

[0045] One side of the glass container 303 is fixedly connected to a drain pipe 310, and a manual valve 311 is fixedly sleeved on the surface of the drain pipe 310; by arranging the drain pipe 310 and the manual valve 311 in coordination, the hydraulic oil and water in the inner cavity of the glass container 303 can be discharged after the hydraulic oil detection is completed, thereby improving the maintenance efficiency of the staff.

[0046] One side of the viscosity tube 308 is fixedly connected to an exhaust pipe 312, and a sealing plug 313 is inserted into the surface of the exhaust pipe 312; by arranging the exhaust pipe 312 and the sealing plug 313 in cooperation, it is convenient for the staff to deflate the inner cavity of the viscosity tube 308. When the gas in the inner cavity of the viscosity tube 308 is discharged, the viscosity of the hydraulic oil can be tested.

[0047] The specific implementation of this embodiment is as follows: when the staff needs to detect the hydraulic oil in the inner cavity of the axial piston pump cylinder 1, the fourth solenoid valve 309 and the water pump 305 are started by using the external control switch. After the fourth solenoid valve 309 is turned on, the water pump 305 pumps the hydraulic oil in the inner cavity of the first three-way pipe 2108 and the water in the glass container 303 into the inner cavity of the viscosity tube 308. Due to the fast fluidity of water, the hydraulic oil is sucked in at a relatively slow speed during the extraction process. After the hydraulic oil enters the inner cavity of the viscosity tube 308, the staff turns off the water pump 305 and then opens the sealing plug 313. After the water at the high point of the viscosity tube 308 is discharged through the exhaust pipe 312, the water does not contact the hydraulic oil, and the hydraulic oil flows downward along the inner wall of the viscosity tube 308. At this time, the staff can calculate the descending speed of the hydraulic oil to obtain the viscosity of the hydraulic oil. When the viscosity of the hydraulic oil is low, the cooling unit 22 can be used to cool the hydraulic oil, thereby increasing the viscosity of the hydraulic oil and avoiding leakage caused by too low viscosity of the hydraulic oil.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bimetallic cylinder structure for an axial piston pump, comprising an axial piston pump cylinder (1), characterized in that: The top of the axial piston pump cylinder (1) is fixedly connected to an oil inlet shell (11), the top of the oil inlet shell (11) is fixedly connected to an oil delivery pipe (12), and one end of the oil delivery pipe (12) is provided with a filtering and cooling mechanism (2); The filtering and cooling mechanism (2) comprises a filtering unit (21), wherein the filtering unit (21) is arranged at one end of the oil delivery pipe (12), and the filtering unit (21) is used to filter the hydraulic oil input into the inner cavity of the axial piston pump cylinder (1); The filtering and cooling mechanism (2) further comprises a cooling unit (22), the cooling unit (22) being used in conjunction with the filtering unit (21), and the cooling unit (22) being used for cooling the hydraulic oil; A hydraulic oil viscosity detection device (3) is provided on one side of the filtering and cooling mechanism (2); the hydraulic oil viscosity detection device (3) is used in conjunction with the filtering and cooling mechanism (2); and the hydraulic oil viscosity detection device (3) is used to detect the viscosity of the hydraulic oil.

2. A bimetallic cylinder structure for an axial piston pump according to claim 1, characterized in that: The filter unit (21) comprises a positioning shell (2101), the positioning shell (2101) is fixedly sleeved on the surface of the oil pipeline (12), the inner cavity of the positioning shell (2101) is provided with a limit plate (2102), the surface of the limit plate (2102) is slidably connected to the inner wall of the positioning shell (2101), one side of the limit plate (2102) is provided with four springs (2103), one end of the spring (2103) is fixedly connected to the inner wall of the positioning shell (2101), the other end of the spring (2103) is fixedly connected to one side of the limit plate (2102), the other side of the limit plate (2102) is provided with a filter element (2104), one side of the filter element (2104) is in contact with the other side of the limit plate (2102), and the positioning shell (210 1) is fixedly installed with a cover plate (2105) on the top by bolts, one side of the positioning shell (2101) is fixedly connected with a first connecting pipe (2106), one end of the first connecting pipe (2106) penetrates into the inner cavity of the positioning shell (2101) and is connected with the inner cavity of the filter element (2104), a first solenoid valve (2107) is fixedly sleeved on the surface of the first connecting pipe (2106), the other end of the first connecting pipe (2106) is fixedly connected with a first three-way pipe (2108), one end of the first three-way pipe (2108) is fixedly connected with a second connecting pipe (2109), one end of the second connecting pipe (2109) is fixedly connected with a second three-way pipe (2110), and one end of the second three-way pipe (2110) is fixedly connected with an oil inlet pipe (2111).

3. A bimetallic cylinder structure for an axial piston pump according to claim 2, characterized in that: Two sealing rings (2112) are fixedly installed in the inner cavity of the positioning shell (2101), one of the sealing rings (2112) is sleeved on the surface of the oil pipeline (12), and the other sealing ring (2112) is sleeved on the surface of the first connecting pipe (2106).

4. A bimetallic cylinder structure for an axial piston pump according to claim 2, characterized in that: A sealing gasket (2113) is fixedly connected to the bottom of the cover plate (2105), and a surface of the sealing gasket (2113) is in contact with the inner wall of the positioning shell (2101).

5. A bimetallic cylinder structure for an axial piston pump according to claim 1, characterized in that: The cooling unit (22) comprises a shell (2201) and a serpentine tube (2202), wherein the shell (2201) is arranged at the bottom of the positioning shell (2101), one end of the serpentine tube (2202) is fixedly connected to the inner cavity of the positioning shell (2101), a second solenoid valve (2203) is fixedly sleeved on the surface of the serpentine tube (2202), the serpentine tube (2202) is arranged in the inner cavity of the shell (2201), and the other end of the serpentine tube (2202) passes through the shell (2201). A return pipe (2204) is fixedly connected to the outside of the housing (2201), one end of the return pipe (2204) is fixedly connected to the inner cavity of the second three-way pipe (2110), a third solenoid valve (2205) is fixedly sleeved on the surface of the return pipe (2204), and a water inlet pipe (2206) and a water outlet pipe (2207) are fixedly connected to one side of the housing (2201), and one end of the water inlet pipe (2206) and the water outlet pipe (2207) are fixedly connected to a flange (2208).

6. A bimetallic cylinder structure for an axial piston pump according to claim 5, characterized in that: A temperature sensor (2209) is fixedly mounted on the surface of the shell (2201), and one end of the temperature sensor (2209) penetrates into the inner cavity of the shell (2201).

7. A bimetallic cylinder structure for an axial piston pump according to claim 1, characterized in that: The hydraulic oil viscosity detection device (3) comprises a guide tube (301) and a positioning plate (302); the guide tube (301) is fixedly connected to the inner cavity of a first three-way tube (2108); the positioning plate (302) is arranged on one side of the first three-way tube (2108); a glass container (303) and a positioning frame (304) are fixedly installed on the top of the positioning plate (302); a water pump (305) is fixedly installed on one side of the positioning frame (304); an output end of the water pump (305) is fixedly connected to a drainage pipe (306); an input end of the water pump (305) is fixedly connected to a third connecting tube (307); one end of the third connecting tube (307) is fixedly connected to the inner cavity of the guide tube (301); one end of the guide tube (301) is fixedly connected to a viscosity tube (308); and the viscosity tube (308) is arranged in the inner cavity of the glass container (303).

8. A bimetallic cylinder structure for an axial piston pump according to claim 7, characterized in that: A fourth solenoid valve (309) is fixedly sleeved on the surface of the guide tube (301), and the fourth solenoid valve (309) is located at the upper end of the first three-way tube (2108).

9. A bimetallic cylinder structure for an axial piston pump according to claim 7, characterized in that: One side of the glass container (303) is fixedly connected to a sewage discharge pipe (310), and a manual valve (311) is fixedly sleeved on the surface of the sewage discharge pipe (310).

10. A bimetallic cylinder structure for an axial piston pump according to claim 7, characterized in that: One side of the viscosity tube (308) is fixedly connected to an exhaust pipe (312), and a sealing plug (313) is inserted into the surface of the exhaust pipe (312).

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