Four-pump parallel integrated valve block of small hydraulic power driving system

Abstract

The invention belongs to the technical field of small hydraulic oil sources, and particularly relates to a small hydraulic power drive system four-pump parallel integrated valve block which is provided with a micro pump inserting hole, an oil outlet filter inserting hole, an oil return filter mounting hole, an oil supplementing valve hole, a constant pressure overflow valve, a pressure regulating overflow valve hole, a one-way valve hole, a pressure oil tank mounting interface and a sensor mounting hole. The integrated valve block is provided with four micro plunger pumps for providing a power oil source for an execution element, and after relevant cartridge valves, filters and sensors are installed, the functions of oil supplementing, pressure regulating and filtering are achieved. The scheme that the four micro pump inserting holes are arranged in parallel is adopted, the axial symmetry geometrical characteristic is achieved, the aluminum shell is adopted, the design is compact, the envelope design is adopted, an oil supplementing way, an oil outlet way and an oil return way are integrated in the shell, the light weight problem is solved, and the integration degree and the power density of a hydraulic system are improved; and meanwhile, a bracket mounting hole is reserved in the scheme, so that a supporting function can be provided for carrying a portable power supply and other auxiliary equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of small hydraulic oil sources, and particularly relates to a four-pump parallel integrated valve block for a small hydraulic power drive system. Background Art

[0002] The small hydraulic power drive system is the "heart" of a hydraulic robot, and the integrated valve block is one of the core components applied to the small hydraulic power drive system. Based on the requirements of the hydraulic robot for high power density and high explosive power, its high integration, high pressure, and instantaneous large flow output require the hydraulic power drive system to achieve functions such as energy conservation, high explosive power, fast response, and anti-overload. The commonly used hydraulic power drive systems of hydraulic robots often adopt a single-pump and single-motor layout. In contrast, the four-pump integrated layout has high power density requirements and high integration. As the core component, the four-pump parallel integrated valve block is required to integrate functions such as oil suction, oil supply, exhaust, oil replenishment, oil return, filtration, and support of four pumps. Its oil circuit is complex, and the structural design is delicate, which can realize flexible control of multiple pumps, and at the same time can realize energy-saving control and redundant configuration. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] The technical problem to be solved by the present invention is: how to provide a four-pump parallel integrated valve block for a small hydraulic power drive system, by symmetrically arranging four pumps and integrating the oil replenishment circuit, the oil outlet circuit and the oil return circuit in the valve body, to realize functions such as oil suction, oil supply, exhaust, oil replenishment, oil return, filtration, and support of the small hydraulic power drive system.

[0005] (2) Technical Solutions

[0006] To solve the above technical problems, the present invention provides a four-pump parallel integrated valve block for a small hydraulic power drive system. The top of the integrated valve block is provided with 4 micro-pump mounting holes (1), 2 one-way valve mounting holes (7), 1 first sensor mounting hole (10) and 4 concave weight-reducing grooves (16);

[0007] The bottom of the integrated valve block is provided with a pressure oil tank mounting interface (8), and an oil return filter mounting hole (3) and a constant pressure relief valve hole (5) that can be integrated inside the pressure oil tank;

[0008] Both the front and the rear of the integrated valve block are provided with a plurality of oil replenishment valve adapters (12) and bracket mounting holes (15);

[0009] A first convex block is arranged on the left side surface of the integrated valve block. The first convex block is provided with an oil return port (13), an oil replenishment valve hole (4), a pressure regulating relief valve hole (6) and a second sensor mounting hole (9); after the oil return port (13) and the oil replenishment valve hole (4) are connected in parallel, they are connected to the oil passage inside the first convex block;

[0010] On the top of the integrated valve block, there are 2 oil outlet filter cartridge holes (2) provided along the center line in the left - right direction;

[0011] On the right - hand side of the integrated valve block, there is a second convex block, on which there are an oil outlet (14) and a third sensor cartridge hole (11).

[0012] Among them, the 4 cartridge holes (1) for micro - pumps provided on the top of the integrated valve block are symmetrically arranged along the front - back center line and the left - right center line, so that the center of gravity of the small hydraulic power drive system is located at the center of symmetry, realizing parallel arrangement, synchronous operation and centralized oil supply, and achieving an oil supply flow rate of not less than 20 L / min under a volume of less than 2100000 mm 3 ³.

[0013] Among them, in the integrated valve body, an oil replenishing circuit, an oil outlet circuit and a return oil circuit are integrated; among them, the oil replenishing circuit is the oil path through which the oil enters the oil passage in the first convex block from the oil replenishing valve hole (4), passes through the return oil filter mounting hole (3), and then enters the bottom pressure oil tank;

[0014] The oil outlet circuit is the oil path through which the oil flows from the high - pressure outlet of the cartridge pump through the oil outlet filter cartridge hole (2) to the oil outlet (14) convex block on the right side of the integrated valve block;

[0015] The return oil circuit is the oil path through which the oil enters the oil passage in the first convex block from the return oil port (13), passes through the return oil filter mounting hole (3) and then enters the bottom pressure oil tank, directly to the pump suction port. At the same time, the return oil of the cartridge pump housing converges into the return oil circuit through 2 one - way valve mounting holes (7).

[0016] Among them, an exhaust and oil replenishing valve is installed at the oil replenishing valve hole (4) at the suction end of the piston pump and at the outlet end of the piston pump of the integrated valve block, so that there is no air and the oil is full at the suction end and the outlet end of the piston pump.

[0017] Among them, a supplementary oil valve adapter (12) can be installed at the exhaust and oil replenishing valve.

[0018] Among them, after the high - pressure outlet of the oil of the cartridge pump of the integrated valve block, a throttle hole is provided in the oil passage between the first sensor cartridge hole (10) and the third sensor cartridge hole (11) to ensure that the pressure difference reaches 0.5 ± 0.1 MPa.

[0019] Among them, the integrated valve block can withstand an oil pressure of not less than 20 MPa.

[0020] Among them, the bracket mounting holes (15) reserved at the front and rear parts (both sides without convex blocks) of the integrated valve block are used to provide support for carrying other equipment weighing not less than 10 kg.

[0021] Among them, between two rows of micro-pump insertion holes (1) arranged in the front-back direction on the top of the integrated valve block, the 4 concave weight-reducing grooves (16) are regularly arranged.

[0022] Among them, when looking at the integrated valve block from the mating surface where the motor is installed from top to bottom, four micro-pump insertion holes (1) are symmetrically arranged along the horizontal center line and the vertical center line at the top. All the inserted pumps suck oil from the bottom pressure oil tank, so there is a pressure oil tank installation interface (8) at the bottom of the integrated valve block; the oil fluid flowing back from the external actuator enters the bottom pressure oil tank via the oil return filter installation hole (3) through the oil return port (13) parallel to the oil replenishing valve hole (4); the high-pressure outlet oil fluid of the inserted pump enters the actuator through the oil outlet (14) in the second convex block on the right side of the integrated valve block via the oil outlet filter insertion hole (2); the oil fluid at the outlet of the inserted pump housing converges into the oil return circuit through 2 one-way valve installation holes (7); when the oil fluid of the small hydraulic power drive system needs to be exhausted and replenished during the initial oil filling or later leakage, the oil fluid enters the oil passage in the first convex block on the left side of the integrated valve block through the oil replenishing valve hole (4), then through the oil return filter installation hole (3), and then enters the bottom pressure oil tank. The exhaust and oil replenishment at the outlet of the inserted pump are realized through the oil replenishing valve adapter (12);

[0023] And second pressure sensor interfaces (9), third pressure sensor interfaces (11), and first pressure sensor interfaces (10) are respectively provided at the oil return port (13), the oil outlet (14), and the high-pressure outlet of the inserted pump;

[0024] The protection of the pressure oil tank is realized through a pressure regulating overflow valve, so a pressure regulating overflow valve hole (6) is provided at the oil return port (13);

[0025] The protection of the small hydraulic power drive system is realized through a constant pressure overflow valve, so a constant pressure overflow valve hole (5) is provided at the high-pressure outlet.

[0026] (III) Beneficial effects

[0027] Compared with the prior art, the four-pump parallel integrated valve block of the small hydraulic power drive system provided by the technical solution of the present invention has the following remarkable effects:

[0028] 1) The present invention adopts a four-pump parallel arrangement, which is symmetrically arranged along the vertical center line and the horizontal center line, solving the problem of concentrated large-scale oil supply in a small volume;

[0029] 2) Integrating the oil replenishing circuit, the oil outlet circuit and the oil return circuit on the valve body solves the problem that it is difficult to centrally realize the composite functions of oil suction, oil supply, exhaust, oil replenishment, oil return and filtration;

[0030] 3) The throttle hole between the high-pressure outlets and the oil outlet oil passages of the four pumps of the integrated valve block adopted in the present invention solves the problem that the output flow rate cannot be measured. Description of the drawings

[0031] Figure 1 This is a schematic structural diagram of the four - pump parallel integrated valve block of the small - scale hydraulic power drive system of the present invention;

[0032] In the figure: 1. Micro - pump cartridge hole; 2. Oil - outlet filter cartridge hole; 3. Return - oil filter mounting hole; 4. Make - up oil valve hole; 5. Constant - pressure relief valve hole; 6. Pressure - regulating relief valve hole; 7. Check valve mounting hole; 8. Pressure oil tank mounting interface; 9. Second sensor cartridge hole; 10. First sensor cartridge hole; 11. Third sensor cartridge hole; 12. Make - up oil valve adapter; 13. Return - oil port; 14. Oil - outlet port; 15. Bracket mounting hole; 16. Concave - shaped weight - reducing groove. Specific embodiments

[0033] To make the objectives, contents, and advantages of the present invention clearer, the following further describes in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments.

[0034] To solve the above - mentioned technical problems, the present invention provides a four - pump parallel integrated valve block for a small - scale hydraulic power drive system. The top of the integrated valve block is provided with 4 micro - pump cartridge holes (1), 2 check valve mounting holes (7), 1 first sensor cartridge hole (10), and 4 concave - shaped weight - reducing grooves (16);

[0035] The bottom of the integrated valve block is provided with a pressure oil tank mounting interface (8), as well as a return - oil filter mounting hole (3) and a constant - pressure relief valve hole (5) that can be integrated inside the pressure oil tank;

[0036] Both the front and rear of the integrated valve block are provided with a plurality of make - up oil valve adapters (12) and bracket mounting holes (15);

[0037] On the left side surface of the integrated valve block, there is a first convex block. The first convex block is provided with a return - oil port (13), a make - up oil valve hole (4), a pressure - regulating relief valve hole (6), and a second sensor cartridge hole (9); After the return - oil port (13) and the make - up oil valve hole (4) are in parallel, they are connected to the oil passage inside the first convex block;

[0038] On the top of the integrated valve block, along the center line in the left - right direction, there are 2 oil - outlet filter cartridge holes (2);

[0039] On the right side of the integrated valve block, there is a second convex block. The second convex block is provided with an oil - outlet port (14) and a third sensor cartridge hole (11).

[0040] Among them, the 4 micro - pump cartridge holes (1) provided on the top of the integrated valve block are symmetrically arranged along the front - rear center line and the left - right center line, so that the center of gravity of the small - scale hydraulic power drive system is located at the center of symmetry, realizing parallel arrangement, synchronous operation, and centralized oil supply, within less than 2100000 mm 3The oil supply flow rate can reach no less than 20L / min under the volume.

[0041] The integrated valve body is integrated with an oil replenishment circuit, an oil outlet circuit and an oil return circuit; the oil replenishment circuit is the oil passage through which the oil enters the oil passage in the first protrusion from the oil replenishment valve hole (4), passes through the oil return filter installation hole (3), and then enters the bottom pressure oil tank;

[0042] The oil outlet passage is the oil passage through which the oil flows from the high-pressure outlet of the cartridge pump through the oil outlet filter cartridge hole (2) to the oil outlet port (14) protrusion on the right side of the integrated valve block;

[0043] The oil return path enters the oil passage in the first protrusion from the oil return port (13), enters the bottom pressure oil tank through the oil return filter mounting hole (3), and directly reaches the oil path of the pump suction port. At the same time, the oil return from the plug-in pump housing is collected into the oil return path through the two one-way valve mounting holes (7).

[0044] The integrated valve block is provided with an exhaust oil replenishing valve at the oil replenishing valve hole (4) at the oil suction end of the plunger pump and the oil discharge end of the plunger pump, so that the oil suction end and the oil discharge end of the plunger pump are free of air and filled with oil.

[0045] Wherein, an oil replenishment valve adapter (12) can be installed at the exhaust oil replenishment valve.

[0046] Wherein, after the integrated valve block is plugged into the pump oil high-pressure outlet, a throttling hole is provided in the oil passage between the first sensor plug-in hole (10) and the third sensor plug-in hole (11) to ensure that the pressure difference reaches 0.5±0.1MPa.

[0047] Wherein, the integrated valve block can withstand an oil pressure of not less than 20 MPa.

[0048] The bracket mounting holes (15) reserved at the front and rear of the integrated valve block (the two sides without the protrusions) are used to provide support for other equipment weighing no less than 10 kg.

[0049] Wherein, the four concave weight-reducing grooves (16) are regularly arranged between two rows of micro pump insertion holes (1) arranged in the front-to-back direction at the top of the integrated valve block.

[0050] Among them, when looking at the integrated valve block from the mating surface where the motor is installed from top to bottom, along the horizontal and vertical centerlines at the top, four micro-pump mounting holes (1) are symmetrically arranged. All the mounted pumps suck oil from the bottom pressure oil tank, so there is a pressure oil tank mounting interface (8) at the bottom of the integrated valve block; the oil fluid flowing back from the external actuator enters the bottom pressure oil tank via the oil return filter mounting hole (3) through the oil return port (13) that is in parallel with the oil replenishing valve hole (4); the high-pressure outlet oil fluid of the mounted pump reaches the oil outlet (14) inside the second convex block on the right side of the integrated valve block through the oil outlet filter mounting hole (2), and thus enters the actuator; the oil fluid at the outlet of the mounted pump housing converges into the oil return circuit through 2 one-way valve mounting holes (7); when the oil fluid of the small hydraulic power drive system needs to be exhausted and replenished during the initial oil filling or later leakage, the oil fluid enters the bottom pressure oil tank through the oil return filter mounting hole (3) after entering the oil passage inside the first convex block on the left side of the integrated valve block through the oil replenishing valve hole (4). The exhaust and oil replenishment at the outlet of the mounted pump are achieved through the oil replenishing valve adapter (12);

[0051] And second pressure sensor interfaces (9), third pressure sensor interfaces (11), and first pressure sensor interfaces (10) are respectively provided at the oil return port (13), the oil outlet (14), and the high-pressure outlet of the mounted pump;

[0052] The protection of the pressure oil tank is achieved through a pressure regulating overflow valve, so a pressure regulating overflow valve hole (6) is provided at the oil return port (13);

[0053] The protection of the small hydraulic power drive system is achieved through a constant pressure overflow valve, so a constant pressure overflow valve hole (5) is provided at the high-pressure outlet.

[0054] Embodiment 1

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "top", "bottom", "left", "right", "front", "rear", "middle", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0056] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Refer to Figure 1As shown, this embodiment has an approximate cuboid feature. The top is a mating surface for installing the motor. Regular concave surfaces and weight-reducing grooves are designed between the four micro-pump insertion holes according to the lightweight requirements. All surfaces are machined planes or arc surfaces.

[0058] When looking down from the mating surface for installing the motor from top to bottom, along the horizontal and vertical centerlines, four micro-pump insertion holes 1 are symmetrically arranged. All the inserted pumps suck oil from the bottom pressure oil tank. Therefore, there is a pressure oil tank installation interface 8 at the bottom of the integrated valve block. The oil fluid flowing back from the external actuator enters the bottom pressure oil tank after passing through the oil return port 13 in parallel with the oil replenishing valve hole 4 and then through the oil return filter installation hole 3. The high-pressure outlet oil fluid of the inserted pump enters the actuator through the oil outlet filter insertion hole 2 and then into the oil outlet 14 inside the right convex block of the valve block. The oil fluid at the outlet of the inserted pump housing converges into the oil return circuit through the installation holes 7 of the 2 one-way valves. When the oil fluid of the small hydraulic power drive system needs to be exhausted and replenished during the initial oil filling or later leakage, the oil fluid enters the bottom pressure oil tank through the oil return filter installation hole 3 after entering the oil passage inside the left convex block of the valve block through the oil replenishing valve hole 4. The exhaust and oil replenishment at the outlet of the inserted pump are realized through the oil replenishing valve adapter 12. And there are installation pressure sensor interfaces 9, 11, and 10 at the oil return port 13, oil outlet 14, and the high-pressure outlet of the inserted pump respectively. The protection of the pressure oil tank is realized through a pressure regulating relief valve. Therefore, a pressure regulating relief valve hole 6 is provided at the oil return port 13. The protection of the small hydraulic power drive system is realized through a constant pressure relief valve. Therefore, a constant pressure relief valve hole 5 is provided at the high-pressure outlet.

[0059] There is a throttle hole in the oil passage between the sensor insertion hole 10 and the sensor insertion hole 11 after the oil outlet of the inserted pump of the integrated valve block, and the flow rate is estimated through the pressure difference.

[0060] The integrated valve block is reserved with a bracket installation hole 15, which can provide a supporting function for carrying a portable power supply and other auxiliary equipment.

[0061] There are four concave weight-reducing grooves 16 between the four pump insertion holes of the integrated valve block for reducing the overall weight.

[0062] In summary, the four-pump parallel integrated valve block of the small hydraulic power drive system in this embodiment includes four cartridge pump mounting holes, one fitting plane, two oil ports, three groups of oil circuits, three pressure sensors, two oil filter mounting holes, one pressure oil tank mounting interface, two overflow valve mounting holes, and five exhaust and oil replenishing valve mounting interfaces. Among them, the four cartridge pumps are arranged side by side and symmetric along the axis; the oil replenishing circuit / return oil circuit intersects, and the return oil port is in parallel with the oil replenishing valve hole. The integrated valve block is cube-shaped, without bosses on the front and back sides, and is symmetrically arranged with mounting screw holes and oil replenishing transfer holes, which can realize bracket installation for fixing and supporting auxiliary equipment. Four symmetrically arranged high-pressure outlet sensor interfaces for cartridge pumps are reserved on the side of the return oil boss and the side of the oil outlet boss of the integrated valve block, which can be used to monitor the operation status of each pump. A unified high-pressure outlet sensor mounting port for the cartridge pump is located at the axis center, and the weight reduction grooves and the suction check valve mounting holes are symmetrically arranged on both sides.

[0063] The present invention is applicable to small hydraulic power drive systems, and is particularly applicable to high-pressure portable small hydraulic power drive systems.

[0064] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A small hydraulic power drive system with four pumps in parallel integrated valve block, characterized in that: The top of the integrated valve block is provided with four micro pump insertion holes (1), two one-way valve installation holes (7), one first sensor insertion hole (10) and four concave weight reduction grooves (16); The bottom of the integrated valve block is provided with a pressure oil tank installation interface (8), as well as a return oil filter installation hole (3) and a constant pressure relief valve hole (5) that can be integrated inside the pressure oil tank; The front and rear parts of the integrated valve block are both provided with a plurality of oil replenishment valve transfer ports (12) and bracket mounting holes (15); A first convex block is arranged on the left side of the integrated valve block, and an oil return port (13), an oil replenishment valve hole (4), a pressure regulating relief valve hole (6) and a second sensor insertion hole (9) are arranged on the first convex block; the oil return port (13) and the oil replenishment valve hole (4) are connected in parallel to the oil passage inside the first convex block; Two oil outlet filter insertion holes (2) are provided on the top of the integrated valve block along the midline in the left-right direction; A second convex block is arranged on the right side of the integrated valve block, and an oil outlet (14) and a third sensor insertion hole (11) are arranged on the second convex block.

2. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 1, characterized in that: The four micro pump insertion holes (1) arranged on the top of the integrated valve block are symmetrically arranged along the front-to-back center line and the left-to-right center line, so that the center of gravity of the small hydraulic power drive system is located at the symmetrical center, realizing parallel arrangement, synchronous operation and centralized oil supply. 3 The oil supply flow rate can reach no less than 20L / min under the volume.

3. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 1, characterized in that: The integrated valve body is integrated with an oil replenishment circuit, an oil outlet circuit and an oil return circuit; wherein the oil replenishment circuit is the oil passage through which the oil enters the oil passage in the first protrusion from the oil replenishment valve hole (4), passes through the oil return filter mounting hole (3), and then enters the bottom pressure oil tank; The oil outlet passage is the oil passage through which the oil flows from the high-pressure outlet of the cartridge pump through the oil outlet filter cartridge hole (2) to the oil outlet port (14) protrusion on the right side of the integrated valve block; The oil return path enters the oil passage in the first protrusion from the oil return port (13), enters the bottom pressure oil tank through the oil return filter mounting hole (3), and directly reaches the oil path of the pump suction port. At the same time, the oil return from the plug-in pump housing is collected into the oil return path through the two one-way valve mounting holes (7).

4. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 1, characterized in that: The integrated valve block is provided with an exhaust oil replenishment valve at the oil replenishment valve hole (4) at the oil suction end of the plunger pump and the oil discharge end of the plunger pump, so that the oil suction end and the oil discharge end of the plunger pump are free of air and filled with oil.

5. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 4, characterized in that: The exhaust oil replenishment valve can be installed at the oil replenishment valve.

6. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 1, characterized in that: After the integrated valve block is plugged into the pump oil high-pressure outlet, a throttling hole is provided in the oil passage between the first sensor plug-in hole (10) and the third sensor plug-in hole (11) to ensure that the pressure difference reaches 0.5±0.1 MPa.

7. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 1, characterized in that: The integrated valve block can withstand an oil pressure of not less than 20 MPa.

8. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 1, characterized in that: The bracket mounting holes (15) reserved at the front and rear of the integrated valve block are used to provide support for other equipment carrying no less than 10 kg.

9. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 1, characterized in that: The four concave weight-reducing grooves (16) are regularly arranged between two rows of micro-pump insertion holes (1) arranged in the front-to-back direction at the top of the integrated valve block.

10. The four-pump parallel integrated valve block of the small hydraulic power drive system according to claim 1, characterized in that: Looking down from the top of the integrated valve block from the mating surface where the motor is installed, four micro pump insertion holes (1) are symmetrically arranged along the horizontal center line and the vertical center line of the top. All the cartridge pumps draw oil from the pressure oil tank at the bottom, so there is a pressure oil tank installation interface (8) at the bottom of the integrated valve block; the oil flowing back from the external actuator enters the bottom pressure oil tank through the return oil port (13) connected in parallel with the oil replenishment valve hole (4) and the return oil filter installation hole (3); the high-pressure outlet oil of the cartridge pump enters the integrated valve block through the oil filter insertion hole (2) The oil outlet (14) in the second convex block on the right side enters the actuator from there; the oil at the outlet of the cartridge pump housing is collected into the oil return path through two one-way valve mounting holes (7); when the oil of the small hydraulic power drive system needs to be exhausted and replenished after initial oil filling or later leakage, the oil enters the oil passage in the convex block on the left first side of the integrated valve block through the oil return filter mounting hole (3) and then enters the bottom pressure oil tank; and the exhaust and oil replenishment at the outlet of the cartridge pump is achieved through the oil replenishment valve adapter (12); A second pressure sensor interface (9), a third pressure sensor interface (11), and a first pressure sensor interface (10) are respectively provided at the oil return port (13), the oil outlet port (14), and the high-pressure outlet of the cartridge pump; The protection of the pressure oil tank is achieved by a pressure regulating relief valve, so a pressure regulating relief valve hole (6) is provided at the oil return port (13); The protection of the small hydraulic power drive system is achieved by a constant pressure relief valve, so a constant pressure relief valve hole (5) is provided at the high pressure outlet.

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