Single-double-control hydraulic power unit

Abstract

The utility model discloses a single-double-control hydraulic power unit, which relates to the technical field of hydraulic pressure and comprises an oil tank, an oil pump and a valve group. The liquid level assembly comprises a stand column, an inserting cylinder, a locking ring, a connecting piece, a cover body and a filtering ring. The top end of the stand column is detachably connected with the connecting piece which is detachably connected with the cover body. The middle lower part of the inserting cylinder can be inserted into the mounting hole, and the upper part can be pressed on the top surface of the mounting cylinder; the connecting piece is detachably connected with the inserting cylinder and / or the locking ring; the filter ring is arranged in the inner cavity of the cover body and sleeves the periphery of the upper part of the connecting piece; an air passage for balancing air pressure inside and outside the oil tank is arranged in the connecting piece; vent holes for balancing air pressure inside and outside the oil tank are formed in the side wall of the inserting cylinder; the lower part of the locking ring is detachably connected with the mounting cylinder, and the upper part is used for pressing the extension fins and supporting the filter ring. The liquid level assembly has the functions of balancing air pressure inside and outside the oil tank, filtering air and monitoring the liquid level, and integration of an air filter and a liquid level meter is achieved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, specifically to a single / dual-control hydraulic power unit. Background Technology

[0002] A hydraulic power unit, also known as an oil supply device, is typically connected to a hydraulic cylinder via several oil pipes. It provides power to the hydraulic cylinder and controls its start and stop.

[0003] A hydraulic power unit includes a tank for storing hydraulic oil. The hydraulic power unit is typically connected to multiple hydraulic cylinders via valve assemblies, and since different hydraulic cylinders have different operating states, the hydraulic oil level in the tank changes frequently. Therefore, it is necessary to balance the air pressure inside and outside the tank to avoid frequent pressure fluctuations, which could lead to frequent deformation and damage to the tank.

[0004] An air filter and a level gauge are typically installed on the oil tank to balance the internal and external air pressure and monitor the liquid level, respectively. This requires at least two mounting holes on the top plate of the oil tank for installing the air filter and level gauge. Since the air filter needs to be periodically removed from the oil tank for filter element replacement, and the level gauge needs to be periodically removed for reading the liquid level or for maintenance, the equipment using this hydraulic power unit (such as hydraulic presses, agricultural machinery, etc.) needs to have separate spaces reserved for the air filter and level gauge to allow for their removal (the oil tank is usually located inside the equipment, and reserving such space is not easy). This necessitates adjustments to other structures of the equipment to accommodate these reserved spaces, increasing design complexity, manufacturing steps, and reducing production efficiency.

[0005] Therefore, how to integrate air filters and level gauges to reduce the need for reserved space and mitigate the problems of increased design difficulty, increased manufacturing steps, and reduced production efficiency has become a pressing technical challenge for the industry. Utility Model Content

[0006] In order to meet the requirements for "integrated air filter and level gauge" mentioned in the background art, this utility model provides a single-dual-control hydraulic power unit.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is:

[0008] A single / double-control hydraulic power unit includes an oil tank, an oil pump, and a valve assembly. The oil tank is connected to the oil pump, and the valve assembly includes a single-control solenoid valve and a double-control solenoid valve, each connected to the oil pump. A leveling assembly is longitudinally inserted into the oil tank, and the top of the leveling assembly is detachably connected to the top plate of the oil tank. The top plate has a mounting hole, and a mounting cylinder is provided around the mounting hole. The bottom end of the mounting cylinder is fixedly connected to the upper surface of the top plate. The leveling assembly includes a column, a connecting cylinder, a locking ring, a connector, a cover, and a filter ring. The lower part of the column is inserted into the hydraulic oil in the oil tank, and the top of the column... The connector is detachably connected to the cover; the lower part of the insert cylinder can be inserted into the mounting hole, and the upper part can be pressed against the top surface of the mounting cylinder; the connector is detachably connected to the insert cylinder and / or the locking ring; the filter ring is placed in the inner cavity of the cover and sleeved on the outer periphery of the upper part of the connector; the connector is provided with an air passage for balancing the air pressure inside and outside the oil tank; the side wall of the insert cylinder is provided with a vent hole for balancing the air pressure inside and outside the oil tank; the lower part of the locking ring is detachably connected to the mounting cylinder, and the upper part is used to press against the extended fins and support the filter ring.

[0009] As a further optimization of this utility model, a sealing ring is provided on the top surface of the mounting cylinder.

[0010] As a further optimization of this utility model, the plug-in cylinder includes a first cylinder body and an extended fin. The extended fin is annular and fixedly installed on the top of the outer side wall of the first cylinder body. The first cylinder body can be inserted into the mounting hole, and the extended fin can be pressed against the upper surface of the sealing ring.

[0011] As a further optimization of this utility model, the vent is located on the side wall of the first cylinder and is placed inside the oil tank.

[0012] As a further optimization of this utility model, the locking ring includes a second cylinder and an inner fin. The inner fin is annular and disposed at the top of the inner wall of the second cylinder. The inner fin can be pressed against the upper surface of the outer fin. The inner wall of the second cylinder is detachably connected to the outer wall of the mounting cylinder by threads. The top surface of the inner fin can abut against the bottom surface of the filter ring.

[0013] As a further optimization of this utility model, the connecting member includes a vertical cylinder, an extended ring body, and an abutting ring body. The outer wall of the column is detachably connected to the inner wall of the vertical cylinder by bolts. The extended ring body is disposed at the bottom end of the outer wall of the vertical cylinder, and the abutting ring body is disposed at the top end of the outer wall of the extended ring body. The top surface of the extended ring body can abut against the inner side of the bottom surface of the filter ring.

[0014] As a further optimization of this utility model, the outer wall of the abutting ring and the inner wall of the inner extension fin are detachably connected by threads.

[0015] As a further optimization of this utility model, the lower part of the outer sidewall of the extended ring body is detachably connected to the inner sidewall of the extended fin and the inner sidewall of the first cylinder body by threads.

[0016] As a further optimization of this utility model, the cover includes a top plate, an edge cylinder, and a connecting cylinder; the outer edge of the bottom surface of the top plate is adapted to and fixedly connected to the top of the edge cylinder, the top of the connecting cylinder is fixedly connected to the middle of the bottom surface of the top plate, and the inner wall of the connecting cylinder is detachably connected to the outer wall of the vertical cylinder by threads; the inner and outer walls of the filter ring are adapted to, fitted to, and pressed together with the outer wall of the connecting cylinder and the inner wall of the edge cylinder, respectively.

[0017] As a further optimization of this utility model, a connecting cavity is provided below the connecting cylinder, and the inner sidewall of the filter ring can block the outer edge of the connecting cavity; the air passage is arranged in the outer ring body, and the top end of the air passage communicates with the connecting cavity and the bottom end communicates with the inner cavity of the first cylinder.

[0018] In summary, this utility model has at least one of the following advantages:

[0019] (1) The liquid level assembly has the functions of balancing the air pressure inside and outside the oil tank, filtering air, and monitoring liquid level. That is, it realizes the integration of air filter and liquid level gauge. Then, only one reserved space is needed on the equipment to perform reading and maintenance operations, thereby suppressing the problems of increased design difficulty, increased manufacturing steps, and reduced production efficiency of the equipment.

[0020] (2) Each component in the liquid level assembly (including the column, plug tube, locking ring, connector, cover and filter ring) is manufactured independently and then assembled, which can reduce the design difficulty of the molding die and the manufacturing difficulty of the components, while realizing the convenient replacement of the filter ring.

[0021] (3) The user removes the connector and locking ring, then removes the cover, connector, column and filter ring as a whole, and then can pry the filter ring out of the cover; then put the new filter ring into the cover to realize convenient replacement and accurate installation of the filter ring.

[0022] (4) The abutment ring temporarily limits the filter ring to prevent the filter ring from falling out of the cover, thereby avoiding the problem that the filter ring cannot be properly inserted into the inner cavity of the cover due to blind snapping by the user, and further avoiding the problem that the air permeability is reduced after the filter ring is squeezed into an irregular shape.

[0023] (5) The splashed hydraulic oil is blocked by the plug sleeve and will not stick to the connector, thus avoiding contact between the hydraulic oil and the air passage and filter ring, thereby avoiding the problems of air passage blockage and hydraulic oil leakage. Attached Figure Description

[0024] The present application will be further explained below with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a left-side view of the valve assembly structure;

[0027] Figure 3 Right view of the liquid level assembly installation location;

[0028] Figure 4 This is a vertical sectional view of the liquid level assembly structure;

[0029] Figure 5 This is a schematic diagram showing the position and structure of the mounting cylinder and locking ring;

[0030] Figure 6 This is a sectional view of the connector structure.

[0031] Figure 7 This is a schematic diagram of the connection structure of the column, connectors, cover, and filter ring.

[0032] Figure 8 This is a schematic diagram showing the state of the contact ring contacting the filter ring;

[0033] Figure 9 This is a schematic diagram showing the state of the inner ring body abutting the filter ring;

[0034] Figure 10 This is a schematic diagram showing the filter ring being squeezed into a wrinkled shape.

[0035] Explanation of reference numerals in the attached figures:

[0036] In the picture,

[0037] 1. Oil tank; 11. Top plate; 111. Mounting cylinder; 12. Liquid level assembly; 121. Column; 122. Insertion cylinder; 1221. First cylinder; 1222. Outer fins; 123. Locking ring; 1231. Second cylinder; 1232. Inner fins; 12321. Air inlet gap; 124. Connector; 1241. Vertical cylinder; 1242. Outer ring; 12421. Air passage; 1243. Abutment ring; 125. Cover; 1251. Top plate; 1252. Edge cylinder; 1253. Connecting cylinder; 12531. Connecting cavity; 126. Filter ring;

[0038] 2. Oil pump;

[0039] 3. Valve assembly; 31. Single-control solenoid valve; 311. First oil port; 32. Double-control solenoid valve; 321. Second oil port. Detailed Implementation

[0040] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows:

[0041] Reference Figures 1-2 This embodiment provides a single-control and dual-control hydraulic power unit, including an oil tank 1, an oil pump 2, and a valve assembly 3. The oil tank 1 is connected to the oil pump 2 (e.g., fixed and sealed by bolts and sealing rings). The valve assembly 3 includes a single-control solenoid valve 31 and a dual-control solenoid valve 32, both connected to the oil pump 2. The oil outlet of the oil tank 1 is connected to the oil inlet of the oil pump 2, and the oil outlet of the oil pump 2 is connected to the inlet of both the single-control solenoid valve 31 and the dual-control solenoid valve 32. The single-control solenoid valve 31 and the dual-control solenoid valve 32 are respectively connected to the oil pump 2 (e.g., fixed and sealed by bolts and sealing rings).

[0042] Reference Figure 2 The single-control solenoid valve 31 is provided with a first oil port 311, and the double-control solenoid valve 32 is provided with a second oil port 321. A first oil nozzle is installed in the first oil port 311 (for example, fixed and sealed by threads and a sealing ring), and a first oil nozzle is installed in the second oil port 321 (for example, fixed and sealed by threads and a sealing ring). The oil pipe of the oil-using equipment (for example, an external hydraulic cylinder) is connected and communicated with the first oil nozzle and / or the second oil nozzle, thereby realizing the supply of hydraulic oil.

[0043] Reference Figure 3 A level indicator 12 is longitudinally inserted into the oil tank 1, and the top of the level indicator 12 is detachably connected to the top plate 11 of the oil tank 1. The level indicator 12 is used to measure the level of hydraulic oil in the oil tank 1 and maintain the balance of air pressure inside and outside the oil tank 1, thereby avoiding the problem of deformation and damage of the oil tank 1 under atmospheric pressure after the hydraulic oil is discharged, or the problem of the oil tank 1 bursting due to the backflow of hydraulic oil into the oil tank 1.

[0044] Reference Figure 3 and Figure 4 The top plate 11 is provided with mounting holes, and a mounting cylinder 111 is provided around the mounting holes. The bottom end of the mounting cylinder 111 is fixedly connected to the upper surface of the top plate 11 (for example, by an integral fixed connection).

[0045] Reference Figure 3 and Figure 4 The liquid level assembly 12 includes a column 121, a plug-in cylinder 122, a locking ring 123, a connector 124, a cover 125, and a filter ring 126.

[0046] Reference Figure 3 and Figure 4The lower part of the column 121 is inserted into the hydraulic oil in the oil tank 1. The user can pull the level indicator 12 out of the oil tank 1 and assess the hydraulic oil level by visually observing the oil marks on the surface of the column 121, thereby determining whether hydraulic oil needs to be added to the oil tank 1. After the user pulls the level indicator 12 out of the oil tank 1, hydraulic oil can be injected into the oil tank 1 through the mounting hole using the oil supply pipe, thus replenishing the hydraulic oil.

[0047] The outer wall of column 121 is provided with scale lines. When the oil mark is below the scale line, the user determines that hydraulic oil needs to be added to oil tank 1; conversely, when the oil mark is above the scale line, it is not necessary to add hydraulic oil to oil tank 1. The specific position of the scale line can be obtained through a limited number of experiments, or calculated based on the cross-sectional area of ​​oil tank 1, and will not be elaborated further.

[0048] Reference Figures 4-7 The top of the column 121 is detachably connected to the connector 124, and the connector 124 is detachably connected to the cover 125. The lower part of the plug-in tube 122 can be inserted into the mounting hole, and the upper part can be pressed against the top surface of the mounting tube 111; the connector 124 is detachably connected to the plug-in tube 122 and / or the locking ring 123; the filter ring 126 is placed in the inner cavity of the cover 125 and sleeved on the outer periphery of the upper part of the connector 124; the connector 124 is provided with an air passage 12421 for balancing the air pressure inside and outside the oil tank 1; the side wall of the plug-in tube 122 is provided with a vent hole for balancing the air pressure inside and outside the oil tank 1.

[0049] Reference Figures 4-7 Each component in the liquid level assembly 12 (including the column 121, the plug-in cylinder 122, the locking ring 123, the connector 124, the cover 125, and the filter ring 126) is manufactured independently and then assembled. This reduces the design difficulty of the molding die and the manufacturing difficulty of the components, while also enabling convenient replacement of the filter ring 126.

[0050] Reference Figures 4-7 The lower part of the locking ring 123 is detachably connected to the mounting cylinder 111, and the upper part is used to press the extended fins 1222 and support the filter ring 126. After the locking ring 123 and the mounting cylinder 111 are removed, the user can lift the entire liquid level assembly 12 upwards, so that the bottom end of the column 121 can be pulled out from the inner cavity of the oil tank 1 for visual observation of the location of the oil stains.

[0051] Reference Figure 4 and Figure 5A sealing ring is provided on the top surface of the mounting cylinder 111. The sealing ring is annular and fits snugly on the top surface of the mounting cylinder 111. The insertion cylinder 122 includes a first cylinder 1221 and an extended fin 1222. The extended fin 1222 is annular and fixedly installed on the top of the outer side wall of the first cylinder 1221 (e.g., by an integral fixed connection). The first cylinder 1221 can be inserted into the mounting hole, and the extended fin 1222 can be pressed against the upper surface of the sealing ring, thereby preventing outside air from bypassing the filter ring 126 and entering the inner cavity of the oil tank 1. A vent is located on the side wall of the first cylinder 1221 and is located inside the inner cavity of the oil tank 1; the vent is used to maintain the air pressure balance inside and outside the oil tank 1. In the course of use, this invention inevitably encounters unexpected situations (such as external impacts) that cause hydraulic oil in the oil tank 1 to splash. The splashed hydraulic oil is blocked by the plug-in sleeve 122 and will not adhere to the connector 124, thus preventing the hydraulic oil from contacting the air passage 12421 and the filter ring 126 (when the hydraulic oil contacts the air passage 12421, under the action of the surface tension of the hydraulic oil, this part of the hydraulic oil will flow upward along the air passage 12421, and then contact the filter ring 126, and then seep into the pores of the filter ring 126), thereby avoiding the problem of the air passage 12421 being blocked and the hydraulic oil leakage loss (the hydraulic oil adhering to the plug-in sleeve 122 will drip off naturally). In this invention, the splashed hydraulic oil impacts and adheres to the plug-in sleeve 122, and when air flows through the vent, it can burst the hydraulic oil in the vent, thereby preventing the vent from being blocked.

[0052] Reference Figure 4 and Figure 5 The locking ring 123 includes a second cylinder 1231 and an inner fin 1232. The inner fin 1232 is annular and disposed at the top of the inner wall of the second cylinder 1231 (e.g., by an integral fixed connection). The inner fin 1232 can be pressed against the upper surface of the outer fin 1222, which further presses against a sealing ring, thereby preventing outside air from bypassing the filter ring 126 and entering the inner cavity of the oil tank 1. The inner wall of the second cylinder 1231 is detachably connected to the outer wall of the mounting cylinder 111 by threads. The top surface of the inner fin 1232 can abut against the bottom surface of the filter ring 126.

[0053] Reference Figures 4-7 The connector 124 includes a vertical cylinder 1241, an extended ring 1242, and an abutting ring 1243. The outer wall of the column 121 is detachably connected to the inner wall of the vertical cylinder 1241 by bolts. The extended ring 1242 is fixedly disposed at the bottom end of the outer wall of the vertical cylinder 1241 (e.g., by an integral fixed connection), and the abutting ring 1243 is fixedly disposed at the top end of the outer wall of the extended ring 1242 (e.g., by an integral fixed connection). The top surface of the extended ring 1242 can abut against the inner side of the bottom surface of the filter ring 126.

[0054] Reference Figures 4-7The outer wall of the abutting ring 1243 and the inner wall of the inner extension fin 1232 are detachably connected by threads.

[0055] Reference Figures 4-7 The lower part of the outer side wall of the outer ring 1242 is detachably connected to the inner side wall of the outer fin 1222 and the inner side wall of the first cylinder 1221 by threads.

[0056] Reference Figures 4-7 The cover 125 includes a top plate 1251, an edge cylinder 1252, and a connecting cylinder 1253. The outer edge of the bottom surface of the top plate 1251 is adapted to and fixedly connected to the top of the edge cylinder 1252 (e.g., through an integral fixed connection). The top of the connecting cylinder 1253 is fixedly connected to the middle of the bottom surface of the top plate 1251 (e.g., through an integral fixed connection). The inner wall of the connecting cylinder 1253 is detachably connected to the outer wall of the vertical cylinder 1241 by threads. The inner and outer walls of the filter ring 126 are adapted to fit and press against the outer wall of the connecting cylinder 1253 and the inner wall of the edge cylinder 1252, respectively. A connecting cavity 12531 is provided below the connecting cylinder 1253, and the inner wall of the filter ring 126 can be sealed at the outer edge of the connecting cavity 12531. An air passage 12421 is provided inside the outer ring 1242, with the top of the air passage 12421 communicating with the connecting cavity 12531 and the bottom communicating with the inner cavity of the first cylinder 1221.

[0057] Reference Figure 8 and Figure 9 An air intake gap 12321 is provided between the inner extension fin 1232 and the edge cylinder 1252.

[0058] Outside air flows sequentially through the intake gap 12321, filter ring 126, connecting cavity 12531, air passage 12421, inner cavity of plug-in cylinder 122, and vent hole before entering the oil tank 1, or flows out of the oil tank 1 to the outside in the opposite direction, thereby ensuring the balance of air pressure inside and outside the oil tank 1. When outside air flows through the filter ring 126, impurity particles (such as dust) are blocked by the filter ring 126 and cannot enter the oil tank 1, thereby avoiding the problem of hydraulic oil contamination, and thus avoiding unnecessary wear of oil pump 2 and hydraulic cylinder, and improving the service life of this utility model.

[0059] The filter ring 126 is made of an elastic porous material (such as a sponge) with pores inside for ventilation.

[0060] Reference Figure 4 , Figure 5 and Figure 7The user disassembles the connector 124 and the locking ring 123 (and also disassembles the connector 124 and the plug-in tube 122), and then removes the cover 125, connector 124, column 121 and filter ring 126 as a whole. The filter ring 126 can then be pried out from the cover 125. The new filter ring 126 is then placed into the cover 125 (and the abutting ring 1243 temporarily limits the filter ring 126 to prevent it from falling out of the cover 125), thus achieving convenient replacement and precise installation of the filter ring 126. Because the cover 125 faces downwards (making it difficult to observe), when reinstalling the cover 125, connector 124, column 121, and filter ring 126 above the insert sleeve 122 / locking ring 123, if the filter ring 126 falls out of the cover 125, the user cannot observe whether the filter ring 126 has been re-adapted and inserted into the inner cavity of the cover 125 (i.e., blind installation is possible). Therefore, if the filter ring 126 cannot be re-adapted and inserted into the inner cavity of the cover 125, the venting function of the liquid level assembly 12 will be weakened (refer to...). Figure 7 and Figure 10 In one scenario, the bottom surface of the connecting cylinder 1253 will compress the inner edge of the filter ring 126 into a wrinkled shape. The wrinkled inner edge of the filter ring 126 will be confined within the communicating cavity 12531, causing the communicating cavity 12531 to be blocked, thus weakening the ventilation function of the liquid level assembly 12. In another scenario, the filter ring 126 may be compressed into an irregular shape by external force, causing its internal pores to be blocked, thus weakening the ventilation function of the liquid level assembly 12. After adjusting the position of the filter ring 126 (making it fit snugly against the inner cavity of the cover 125), the abutment ring 1243 is used to temporarily support the filter ring 126, avoiding the problem of the filter ring 126 re-locking after it comes off.

[0061] Reference Figure 8 and Figure 9 The inner fins 1232 of the locking ring 123 can block the air holes at the inner edge of the bottom surface of the filter ring 126. As a result, outside air can only enter the filter ring 126 through the air holes at the outer edge of the bottom surface of the filter ring 126. Therefore, the path of outside air flowing through the filter ring 126 is longer, which has a better filtration effect on impurity particles.

[0062] Reference Figure 4 and Figure 5 The bottom end of the plug-in tube 122 is provided with a base plate (for example, by integral fixed connection or by welding fixed connection), and a circular through hole is provided in the middle of the base plate, into which the column 121 is inserted.

[0063] This utility model has a simple structure and reliable function. The liquid level component 12 has the functions of balancing the internal and external air pressure of the oil tank 1, filtering air, and monitoring liquid level. It integrates the air filter and the liquid level gauge, so only one reserved space is needed on the equipment to read and maintain the level, thereby suppressing the problems of increased design difficulty, increased manufacturing steps, and reduced production efficiency of the equipment.

[0064] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0065] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this utility model based on its guidance, without departing from its principles and spirit, shall still fall within the protection scope of this utility model.

Claims

1. A hydraulic power unit with single / dual control, characterized in that: It includes an oil tank (1), an oil pump (2), and a valve group (3); the oil tank (1) is connected to the oil pump (2), and the valve group (3) includes a single-control solenoid valve (31) and a double-control solenoid valve (32) respectively connected to the oil pump (2). A liquid level assembly (12) is longitudinally inserted into the oil tank (1), and the top of the liquid level assembly (12) is detachably connected to the top plate (11) of the oil tank (1). The top plate (11) is provided with mounting holes, and a mounting cylinder (111) is provided around the outer periphery of the mounting holes. The bottom end of the mounting cylinder (111) is fixedly connected to the upper surface of the top plate (11). The liquid level assembly (12) includes a column (121), a plug-in cylinder (122), a locking ring (123), a connector (124), a cover (125), and a filter ring (126); the lower part of the column (121) is inserted into the hydraulic oil in the oil tank (1), the top of the column (121) is detachably connected to the connector (124), and the connector (124) is detachably connected to the cover (125); the lower part of the plug-in cylinder (122) can be inserted into the mounting hole, and the upper part... It can be pressed against the top surface of the mounting cylinder (111); the connector (124) is detachably connected to the plug-in cylinder (122) and / or the locking ring (123); the filter ring (126) is placed in the inner cavity of the cover (125) and sleeved on the outer periphery of the upper part of the connector (124); the connector (124) is provided with an air passage (12421) for balancing the air pressure inside and outside the oil tank (1); the side wall of the plug-in cylinder (122) is provided with a vent hole for balancing the air pressure inside and outside the oil tank (1); The insertion tube (122) includes a first tube body (1221) and an extension fin (1222). The extension fin (1222) is annular and fixedly installed on the top of the outer side wall of the first tube body (1221). The first tube body (1221) can be inserted into the mounting hole. The lower part of the locking ring (123) is detachably connected to the mounting cylinder (111), and the upper part is used to press the extended fins (1222) and support the filter ring (126).

2. The single / dual dual-control hydraulic power unit according to claim 1, characterized in that: The top surface of the mounting cylinder (111) is provided with a sealing ring.

3. The single / dual dual-control hydraulic power unit according to claim 2, characterized in that: The extended fins (1222) can be pressed onto the upper surface of the sealing ring.

4. The single / dual dual-control hydraulic power unit according to claim 3, characterized in that: The vent is located on the side wall of the first cylinder (1221) and is located inside the oil tank (1).

5. The single / dual dual-control hydraulic power unit according to claim 4, characterized in that: The locking ring (123) includes a second cylinder (1231) and an inner fin (1232). The inner fin (1232) is annular and disposed at the top of the inner wall of the second cylinder (1231). The inner fin (1232) can be pressed against the upper surface of the outer fin (1222). The inner wall of the second cylinder (1231) is detachably connected to the outer wall of the mounting cylinder (111) by threads. The top surface of the inner fin (1232) can abut against the bottom surface of the filter ring (126).

6. The single / dual dual-control hydraulic power unit according to claim 5, characterized in that: The connector (124) includes a vertical cylinder (1241), an extended ring (1242), and an abutting ring (1243). The outer wall of the column (121) is detachably connected to the inner wall of the vertical cylinder (1241) by bolts. The extended ring (1242) is located at the bottom end of the outer wall of the vertical cylinder (1241), and the abutting ring (1243) is located at the top end of the outer wall of the extended ring (1242). The top surface of the extended ring (1242) can abut against the inner side of the bottom surface of the filter ring (126).

7. The single / dual dual-control hydraulic power unit according to claim 6, characterized in that: The outer wall of the abutting ring (1243) and the inner wall of the inner extension fin (1232) are detachably connected by threads.

8. The single / dual dual-control hydraulic power unit according to claim 6, characterized in that: The lower part of the outer sidewall of the extended ring (1242) is detachably connected to the inner sidewall of the extended fin (1222) and the inner sidewall of the first cylinder (1221) by threads.

9. The single / dual dual-control hydraulic power unit according to claim 6, characterized in that: The cover (125) includes a top plate (1251), an edge cylinder (1252), and a connecting cylinder (1253); the outer edge of the bottom surface of the top plate (1251) is adapted to and fixedly connected to the top of the edge cylinder (1252), the top of the connecting cylinder (1253) is fixedly connected to the middle of the bottom surface of the top plate (1251), and the inner wall of the connecting cylinder (1253) is detachably connected to the outer wall of the vertical cylinder (1241) by threads; the inner and outer walls of the filter ring (126) are adapted to fit and press against the outer wall of the connecting cylinder (1253) and the inner wall of the edge cylinder (1252), respectively.

10. The single / dual dual-control hydraulic power unit according to claim 9, characterized in that: The connecting cylinder (1253) has a connecting cavity (12531) below it, and the inner wall of the filter ring (126) can block the outer edge of the connecting cavity (12531); the air passage (12421) is set in the outer ring body (1242), and the top end of the air passage (12421) is connected to the connecting cavity (12531), and the bottom end is connected to the inner cavity of the first cylinder body (1221).

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