Gas-liquid pressurizing mechanism in hydraulic station

Abstract

The utility model provides a gas-liquid pressurizing mechanism in a hydraulic station, and belongs to the technical field of machinery. The problem that the size of a hydraulic station is large under the condition that the same flow and pressure are output is solved. The device comprises an oil cylinder and two pressurizing cylinders, each pressurizing cylinder comprises a cylinder body, a cylinder piston and a cylinder piston rod, the cylinder piston and the cylinder piston rod are fixed to each other, the oil cylinder comprises an oil cylinder body and an oil cylinder piston arranged in the oil cylinder body, and the two pressurizing cylinders are located on the two sides of the oil cylinder respectively. The oil cylinder body is in a barrel shape with two open ends and is fixed between the two air cylinder bodies, the two air cylinder bodies are respectively provided with a connecting port communicated with the interior of the oil cylinder body, the two air cylinder piston rods extend into the oil cylinder body and are fixedly connected with the oil cylinder piston, the two connecting ports are respectively connected with an oil nozzle, and the two oil nozzles are respectively provided with an oil outlet and an oil return port. The oil outlet and the oil return port of each oil nozzle are communicated with the corresponding connecting port, and the oil outlets of the two oil nozzles are communicated. The hydraulic station has the advantages of reducing the size of the hydraulic station and the like.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a gas-liquid booster mechanism in a hydraulic station. Background Technology

[0002] A hydraulic power unit (also known as a hydraulic pump station) is a hydraulic device that supplies oil according to required flow direction, pressure, and flow rate. It is typically used in conjunction with machine tools that require hydraulically driven actuators. The hydraulic power unit provides driving force to the actuators, such as providing clamping force to fixtures or propulsion force to molds. For example, a pneumatic-hydraulic conversion hydraulic power unit disclosed in patent application number 202220372847.2 includes a hydraulic power unit body, which comprises a left-side oil cylinder, a pneumatic cylinder body, and a right-side oil cylinder. The left-side oil cylinder has a left-side cylinder barrel with a left-side oil inlet / outlet port on its left side and a left-side cylinder piston on its right side. The pneumatic cylinder body has a pneumatic cylinder barrel and a pneumatic piston inside. The right-side oil cylinder has a right-side cylinder barrel with a right-side cylinder piston inside its right side and a right-side oil inlet / outlet port on its right side. A pneumatic-hydraulic integrated piston rod connects the left-side oil cylinder, the pneumatic cylinder body, and the right-side oil cylinder. In operation, compressed air is input through the inlet ports at both ends of the cylinder, pushing the cylinder piston to slide left and right. The cylinder piston, via the piston rod, drives the left and right cylinder pistons simultaneously to move left and right, thereby achieving the intake of hydraulic oil and the output of high-pressure oil in both cylinders. For example, when the cylinder piston moves to the left, the left cylinder outputs high-pressure oil outward, while the right cylinder draws in hydraulic oil; when the cylinder piston moves to the right, the right cylinder outputs high-pressure oil outward, while the left cylinder draws in hydraulic oil.

[0003] In other words, the hydraulic station performs work every time the cylinder moves. Furthermore, to ensure that the hydraulic station performs the same work every time the cylinder moves, a left-side hydraulic cylinder and a right-side hydraulic cylinder are respectively set on both sides of the cylinder body. These are connected to the left-side piston of the left-side cylinder and the right-side piston of the right-side cylinder by a pneumatic-hydraulic integrated piston rod. Simultaneously, the left-side cylinder has a left-side oil inlet / outlet located to the left of the left-side piston, and the right-side cylinder has a right-side oil inlet / outlet located to the right of the right-side piston. This ensures that the right-side space of the left-side piston and the left-side space of the right-side piston are both empty of oil. In other words, oil only flows in and out of the left-side space of the left-side piston, and only the right-side space of the right-side piston. The cross-sectional area of ​​the left-side cylinder to the left of the left-side piston and the right-side cylinder to the right of the right-side piston are always the same. Same cross-sectional area means same flow rate and pressure, thus ensuring that the hydraulic station performs the same work every time, guaranteeing the stability of the hydraulic station's operation. Ultimately, the driving force provided to the mechanism will not fluctuate, making it particularly suitable for mechanisms with high precision requirements. However, to ensure that the output flow and pressure of the hydraulic station are the same each time it performs work, the method of driving two oil cylinders simultaneously by one cylinder means that the cross-sectional area of ​​the cylinder piston must be made very large. A large cross-sectional area of ​​the cylinder piston means a large radial volume of the cylinder. A large radial volume of the cylinder means that the main body of the hydraulic station must also be larger, which will result in the hydraulic station occupying more space in actual use. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a gas-liquid booster mechanism in a hydraulic station, which solves the problem of the large volume of the hydraulic station under the same output flow and pressure.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A pneumatic-hydraulic booster mechanism in a hydraulic station includes an oil cylinder and a booster cylinder. The booster cylinder includes a cylinder body and a cylinder piston and a cylinder piston rod, both disposed within the cylinder body and fixed to each other. The oil cylinder includes an oil cylinder body and an oil cylinder piston disposed within the oil cylinder body. The booster cylinder is characterized by having two booster cylinders, each located on one side of the oil cylinder. The oil cylinder body is a cylindrical shape with open ends, fixed between the two cylinder bodies. Each cylinder body has a connection port communicating with the interior of the oil cylinder body. Both cylinder piston rods extend into the oil cylinder body and are fixedly connected to the oil cylinder piston. Oil nozzles are connected to both connection ports, each nozzle having an oil outlet and an oil return port. The oil outlet and oil return port of each nozzle communicate with the corresponding connection port, and the oil outlets of the two nozzles are connected.

[0007] The two booster cylinders work together, meaning that air is simultaneously supplied to their cylinder bodies, causing both pistons to move in the same direction. This movement of the pistons drives the piston rods and the hydraulic cylinder pistons, which are fixed to these piston rods, to move synchronously. As the hydraulic cylinder pistons move, oil is discharged from the outlet of one nozzle and supplied for use, while oil is drawn back into the cylinder through the return port of the other nozzle. Then, air is simultaneously supplied to the booster cylinders again, causing both pistons to move in the opposite direction. Again, the piston rods and hydraulic cylinder pistons move synchronously. As the hydraulic cylinder pistons move, oil is discharged from the outlet of the nozzle that previously drew oil in and supplied for use, while oil is drawn back into the cylinder through the return port of the nozzle that previously drew oil out. Essentially, with each movement of the piston in the hydraulic cylinder, the cylinder performs work. Since the piston rods of both air cylinders are fixedly connected to the pistons in the hydraulic cylinders, the cross-sectional area on both sides of the cylinder body remains the same. A consistent cross-sectional area means consistent flow and pressure, ensuring that the work performed by the cylinder is always the same, thus guaranteeing the stability of the hydraulic station and preventing fluctuations in the driving force provided to the mechanism. This is particularly suitable for mechanisms with high precision requirements. Furthermore, compared to existing technologies that use one air cylinder to drive two hydraulic cylinders, this pneumatic-hydraulic booster mechanism uses two booster cylinders to jointly drive one hydraulic cylinder. This not only maintains the overall axial length of the pneumatic-hydraulic booster mechanism but also reduces its overall radial volume (because in the case of using the same amount of air to achieve the same thrust, the thrust in the prior art is achieved by one air cylinder, while the thrust in this case is achieved by two working booster cylinders; therefore, the radial volume of each booster cylinder in this case is obviously half that of a single cylinder in the prior art). This allows for a corresponding reduction in the size of the hydraulic station, thus reducing the space it occupies during use.

[0008] Furthermore, by directly designing the cylinder body as a cylindrical shape with open ends, and fixing the cylinder body directly between the cylinder bodies of the two booster cylinders, and providing a connection port on each cylinder body that communicates with the interior of the cylinder body, it is equivalent to a part of the two cylinder bodies being directly used as part of the cylinder. Compared to directly using two complete booster cylinders and one complete cylinder, this eliminates the need for two end caps as in existing cylinders. While ensuring that the cylinder performs the same work each time, the overall volume of the gas-liquid booster mechanism can be made relatively small.

[0009] In the air-liquid booster mechanism of the aforementioned hydraulic station, each of the two cylinder bodies has a columnar protrusion on one side opposite to the other. The cylinder body is fitted over the two protrusions, and each protrusion has an inner hole. The piston rods of the two cylinders pass through the two inner holes respectively, and the inner holes are connected to the connection ports on the cylinder bodies.

[0010] The columnar protrusion provides a positioning location for the connection between the hydraulic cylinder body and the pneumatic cylinder body. The protrusion has an inner hole that communicates with the connection port on the corresponding pneumatic cylinder body. This allows the connection port on the pneumatic cylinder body containing the protrusion to communicate with the hydraulic cylinder body through the inner hole after the hydraulic cylinder body is fitted over the protrusion. This ensures that a portion of both pneumatic cylinder bodies can be directly used as part of the hydraulic cylinder, reducing the overall volume of the pneumatic-hydraulic booster mechanism.

[0011] In the air-liquid booster mechanism of the aforementioned hydraulic station, the cylinder body includes a cylinder liner with two open ends and a first end cover and a second end cover respectively connected to the two ends of the cylinder liner. The two second end covers are arranged opposite to each other, and the protrusion and connection port are both provided on the second end cover.

[0012] With the above configuration, the second end cap can be used as both the end cap of the cylinder body and the end cap of the hydraulic cylinder.

[0013] In the aforementioned pneumatic-hydraulic booster mechanism of a hydraulic station, the second end cover is provided with a first mounting groove and a second mounting groove in sequence along the axial direction of the cylinder piston rod. The first mounting groove is close to the cylinder piston of the corresponding booster cylinder. A first sealing ring is provided in the first mounting groove, and a second sealing ring is provided in the second mounting groove. Both the first and second sealing rings are in contact with the outer peripheral wall of the corresponding cylinder piston rod. The second end cover is also provided with a pressure relief hole, which is located between the first and second mounting grooves and penetrates the inner and outer walls of the second end cover.

[0014] Because the second end cap also serves as the end cap of the hydraulic cylinder, in addition to using the first sealing ring to prevent air leakage from the cylinder body, a second sealing ring is also provided to prevent oil leakage from the cylinder body.

[0015] If wear of the first and second sealing rings leads to minor leaks, air from the cylinder body may leak into the oil cylinder body, or oil from the oil cylinder body may leak into the cylinder body. To address this, a pressure relief hole is provided on the second end cover. This hole is located between the first and second mounting grooves and extends through both the inner and outer walls of the second end cover. Because the pressure at the pressure relief hole is always lower than the pressure inside both the cylinder body and the oil cylinder body, air from the cylinder body will only leak outwards through the pressure relief hole and not into the oil cylinder body, and oil from the oil cylinder body will only leak outwards through the pressure relief hole and not into the cylinder body. This ensures the reliable operation of the air-hydraulic booster mechanism in this hydraulic station.

[0016] In the aforementioned pneumatic-hydraulic booster mechanism of a hydraulic station, the cylinder piston has a central hole, and an annular partition protrudes from the inner wall of the central hole of the cylinder piston. The piston rods of two cylinders are respectively inserted into the central hole of the cylinder piston and abut against both sides of the partition. One cylinder piston rod has a connecting hole, and the other cylinder piston rod has a connector. The connector passes through the partition and is threaded into the connecting hole.

[0017] During installation, the cylinder piston rod with the connecting hole is inserted into the center hole of the hydraulic cylinder piston and rests against one side of the partition. Then, the cylinder piston rod with the connector is inserted into the center hole of the hydraulic cylinder piston, and the connector is threaded into the connecting hole until the cylinder piston rod rests against the other side of the partition. This arrangement ensures that the hydraulic cylinder body has the same cross-sectional area on both sides of the hydraulic cylinder piston, and also ensures the coaxiality of the two cylinder piston rods, guaranteeing smooth movement of the hydraulic cylinder piston.

[0018] In the aforementioned pneumatic-hydraulic booster mechanism of a hydraulic station, as another technical solution, the cylinder piston has a central hole, and the piston rods of both cylinders are threadedly connected to the central hole of the cylinder piston.

[0019] The above settings also ensure that the cylinder body has the same cross-sectional area on both sides of the cylinder piston.

[0020] In the aforementioned pneumatic-hydraulic booster mechanism of a hydraulic station, the hydraulic station includes an oil tank and an oil circuit block. The oil tank includes a tank body and a tank cover. The oil circuit block is fixed on the top of the tank cover. The pneumatic-hydraulic booster mechanism is located inside the oil tank, and two booster cylinders are fixed on the bottom of the tank cover. The oil circuit block is connected to a main oil outlet pipe. Each oil outlet and each oil return port is connected to a check valve. The check valves located at each oil outlet are connected to the main oil outlet pipe through a branch oil pipe.

[0021] Compared with existing technologies, the pneumatic-hydraulic booster mechanism in this hydraulic station has the following advantages:

[0022] 1. By setting two booster cylinders connected to both sides of the oil cylinder and having both booster cylinders work simultaneously, the piston rods of the two booster cylinders extend into the oil cylinder body and are fixedly connected to the oil cylinder piston. This ensures that the cross-sectional area on both sides of the oil cylinder piston inside the oil cylinder body is always the same. The same cross-sectional area means that the flow rate and pressure are the same, thus ensuring that the work done by the oil cylinder is the same each time, thereby ensuring the working stability of the hydraulic station. Furthermore, this pneumatic-hydraulic booster mechanism is driven by two booster cylinders to work one oil cylinder. This not only does not change the overall axial length of the pneumatic-hydraulic booster mechanism, but also reduces the overall radial volume of the pneumatic-hydraulic booster mechanism. As a result, the volume of the hydraulic station can be reduced accordingly, thereby reducing the space occupied by the hydraulic station during use.

[0023] 2. The cylinder body is directly designed as a cylindrical shape with open ends. The cylinder body is directly fixed between the cylinder bodies of the two booster cylinders, and each cylinder body has a connection port that communicates with the inside of the cylinder body. In this way, a part of the two cylinder bodies can be directly used as part of the cylinder, eliminating the need for two end caps as in existing cylinders. This ensures that the cylinder does the same work each time, and also makes the overall volume of the gas-liquid booster mechanism smaller. Attached Figure Description

[0024] Figure 1 This is a 3D schematic diagram of the hydraulic station.

[0025] Figure 2 This is a 3D schematic diagram of the hydraulic station after the housing has been removed.

[0026] Figure 3 This is a three-dimensional schematic diagram of a gas-liquid booster mechanism.

[0027] Figure 4 This is a three-dimensional schematic diagram of the gas-liquid booster mechanism from another angle.

[0028] Figure 5 This is a cross-sectional view of the gas-liquid booster mechanism.

[0029] In the diagram, 1. Oil tank; 1a. Tank body; 1b. Tank cover; 2. Oil passage block; 3. Oil cylinder; 3a. Oil cylinder body; 3b. Oil cylinder piston; 3b1. Divider; 4. Boost cylinder; 4a. Cylinder body; 4a1. Cylinder liner; 4a2. First end cap; 4a21. First air port; 4a3. Second end cap; 4a31. Connecting port; 4a32. Protrusion; 4a33. Inner hole; 4a34. Second air port; 4a35. Pressure relief hole; 4b. Cylinder piston; 4c. Cylinder piston rod; 4c1. Connecting hole; 4c2. Connector; 5. Oil nozzle; 5a. Oil outlet; 5b. Oil return port; 6. Main oil outlet pipe; 7. One-way valve; 8. Oil distribution pipe; 9. First sealing ring; 10. Second sealing ring. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] Example 1

[0032] like Figures 1-5As shown, a pneumatic-hydraulic booster mechanism in a hydraulic power unit is disclosed. The hydraulic power unit includes an oil tank 1 and an oil passage block 2. The pneumatic-hydraulic booster mechanism is located inside the oil tank 1. The oil tank 1 includes a tank body 1a and a tank cover 1b. The oil passage block 2 is fixed to the top of the tank cover 1b. The pneumatic-hydraulic booster mechanism includes an oil cylinder 3 and a booster cylinder 4. The booster cylinder 4 is fixed to the bottom of the tank cover 1b, and the oil cylinder 3 and the booster cylinder 4 are connected. The booster cylinder 4 includes a cylinder body 4a and a cylinder piston 4b and a cylinder piston rod 4c, both disposed within the cylinder body 4a and fixed to each other. The oil cylinder 3 includes a cylinder body 3a and a cylinder piston 3b disposed within the cylinder body 3a. There are two booster cylinders 4, located on either side of the hydraulic cylinder 3. The hydraulic cylinder body 3a is a cylindrical shape with open ends, and is fixedly connected between the two cylinder bodies 4a. Each cylinder body 4a has a connection port 4a31 that communicates with the interior of the hydraulic cylinder body 3a. Both cylinder piston rods 4c extend into the hydraulic cylinder body 3a and are fixedly connected to the hydraulic cylinder piston 3b. Oil nozzles 5 are connected to both connection ports 4a31. Each oil nozzle 5 has an oil outlet 5a and an oil return port 5b. The oil outlet 5a and oil return port 5b of each oil nozzle 5 communicate with the corresponding connection port 4a31, and the oil outlets 5a of the two oil nozzles 5 are connected. The oil circuit block 2 is connected to a main oil outlet pipe 6. Each oil outlet 5a and each oil return port 5b is connected to a one-way valve 7. The one-way valve 7 located at each oil outlet 5a is connected to the main oil outlet pipe 6 through a branch oil pipe 8. The one-way valve 7 at the oil outlet 5a and the one-way valve 7 at the oil return port 5b have opposite directions of action. The one-way valve 7 at the oil return port 5b is to prevent the oil in the cylinder body 3a from flowing out of the oil return port 5b, while the one-way valve 7 at the oil outlet 5a is to prevent the oil in the main oil outlet pipe 6 from flowing back into the cylinder body 3a from the oil outlet 5a.

[0033] Among them, such as Figure 3 , Figure 4 and Figure 5As shown, each of the two cylinder bodies 4a has a columnar protrusion 4a32 on one side facing each other. The cylinder body 3a is fitted over both protrusions 4a32. Both protrusions 4a32 have an inner hole 4a33. The piston rods 4c of the two cylinders pass through the two inner holes 4a33 respectively. The inner holes 4a33 are connected to the connection ports 4a31 on the cylinder body 4a. In this embodiment, the cylinder body 4a includes a cylinder liner 4a1 with open ends and a first end cap 4a2 and a second end cap 4a3 fixed to both ends of the cylinder liner 4a1. The second end caps 4a3 of the two booster cylinders 4 are arranged opposite each other. The protrusions 4a32 and the connection ports 4a31 are both provided on the second end caps 4a3. The first end cap 4a2 is also provided with a first air port 4a21, and the second end cap 4a3 is also provided with a second air port 4a34. The first air port 4a21 and the second air port 4a34 are both connected to the interior of the corresponding cylinder liner 4a1. The second end cover 4a3 has a first mounting groove and a second mounting groove arranged sequentially along the axial direction of the cylinder piston rod 4c. The first mounting groove is close to the cylinder piston 4b of the corresponding booster cylinder 4. A first sealing ring 9 is provided in the first mounting groove, and a second sealing ring 10 is provided in the second mounting groove. Both the first sealing ring 9 and the second sealing ring 10 are in contact with the outer peripheral wall of the corresponding cylinder piston rod 4c. The second end cover 4a3 also has a pressure relief hole 4a35, which is located between the first mounting groove and the second mounting groove. The pressure relief hole 4a35 penetrates the inner wall and the outer wall of the second end cover 4a3. The hydraulic cylinder piston 3b has a central hole, and an annular partition 3b1 protrudes from the inner wall of the central hole. The piston rods 4c of the two cylinders are respectively inserted into the central holes of the hydraulic cylinder piston 3b and abut against the two sides of the partition 3b1. One piston rod 4c of the cylinder has a connecting hole 4c1, and the other piston rod 4c of the cylinder has a connector 4c2. The connector 4c2 passes through the partition 3b1 and is threaded into the connecting hole 4c1.

[0034] The two booster cylinders 4 operate simultaneously, meaning they simultaneously supply air to the cylinder body 4a of the booster cylinder 4, causing the two cylinder pistons 4b to move in the same direction. In this embodiment, air is simultaneously supplied to the first air port 4a21 of one booster cylinder 4 and the second air port 4a34 of the other booster cylinder 4. After air supply, the two cylinder pistons 4b move simultaneously, and the two cylinder piston rods 4c move along with the two cylinder pistons 4b. Thus, the hydraulic cylinder piston 3b, which is fixed to the two cylinder piston rods 4c, also moves synchronously. As the hydraulic cylinder piston 3b moves, oil in the hydraulic cylinder body 3a is supplied to the oil passage block 2 from the oil outlet 5a of one of the oil nozzles 5, while oil in the oil tank 1 is drawn into the hydraulic cylinder body 3a from the oil return port 5b of the other oil nozzle 5. Afterwards, the first air port 4a21 stops supplying air and instead supplies air to the second air port 4a34 of the booster cylinder 4 where the first air port 4a21 is located. Similarly, the second air port 4a34 stops supplying air and instead supplies air to the first air port 4a21 of the booster cylinder 4 where the second air port 4a34 is located. This causes both cylinder pistons 4b to move simultaneously in the opposite direction. Likewise, the two cylinder piston rods 4c and the hydraulic cylinder piston 3b move synchronously. As the hydraulic cylinder piston 3b moves, the oil in the hydraulic cylinder body 3a is supplied to the oil passage block 2 from the oil outlet 5a of the previously suction nozzle 5. At the same time, the oil in the oil tank 1 is drawn into the hydraulic cylinder body 3a from the return oil outlet 5b of the previously discharge nozzle 5. In other words, with each movement of the piston 3b, the cylinder 3 will do work. Moreover, since the piston rods 4c of both cylinders are fixedly connected to the piston 3b, the cross-sectional area on both sides of the piston 3b is always the same. The same cross-sectional area means that the flow rate and pressure are the same, thus ensuring that the work done by the cylinder 3 is the same each time, thereby ensuring the working stability of the hydraulic station.

[0035] In addition, the cylinder body 3a is a cylindrical shape with open ends. The cylinder body 3a is directly fixed between the cylinder bodies 4a of the two booster cylinders 4. This means that part of the two cylinder bodies 4a can be directly used as part of the cylinder 3, eliminating the need for two end caps similar to those in the existing cylinder 3. This ensures that the cylinder 3 performs the same work each time, while also making the overall volume of the gas-liquid booster mechanism relatively small.

[0036] Example 2

[0037] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the piston rods 4c of both cylinders are threaded into the center hole of the piston 3b of the oil cylinder.

[0038] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A gas-liquid pressure intensifier in a hydraulic station, comprising a cylinder (3) and a pressure intensifier cylinder (4), the pressure intensifier cylinder (4) comprising a cylinder body (4a) and a cylinder piston (4b) and a cylinder piston rod (4c) which are arranged in the cylinder body (4a) and are fixed to each other, the cylinder (3) comprising a cylinder body (3a) and a cylinder piston (3b) arranged in the cylinder body (3a), characterized in that, The two pressurized cylinders (4) are located on both sides of the oil cylinder (3), the oil cylinder body (3a) is in the form of an open cylinder, the oil cylinder body (3a) is fixed between the two cylinder bodies (4a), each of the two cylinder bodies (4a) is provided with a connecting port (4a31) in communication with the inside of the oil cylinder body (3a), the two cylinder piston rods (4c) are inserted into the oil cylinder body (3a) and fixedly connected with the oil cylinder piston (3b), each of the two connecting ports (4a31) is connected with an oil nozzle (5), each of the two oil nozzles (5) is provided with an oil outlet (5a) and an oil return port (5b), the oil outlet (5a) and the oil return port (5b) of each oil nozzle (5) are in communication with the corresponding connecting port (4a31), and the oil outlets (5a) of the two oil nozzles (5) are in communication.

2. The gas-liquid pressurizing mechanism in a hydraulic station according to claim 1, characterized in that, The opposite sides of the two cylinder bodies (4a) are provided with columnar protrusions (4a32), the oil cylinder body (3a) is sleeved outside the two protrusions (4a32), the two protrusions (4a32) are each provided with an inner hole (4a33), and the two cylinder piston rods (4c) pass through the two inner holes (4a33) respectively, and the inner hole (4a33) is in communication with the connecting port (4a31) on the cylinder body (4a) where the inner hole (4a33) is located.

3. The gas-liquid pressurizing mechanism in a hydraulic station according to claim 2, characterized in that, The cylinder body (4a) comprises a cylinder sleeve (4a1) in the form of an open cylinder and first and second end covers (4a2 and 4a3) connected to the two ends of the cylinder sleeve (4a1) respectively, the two second end covers (4a3) are oppositely arranged, and the protrusions (4a32) and the connecting ports (4a31) are arranged on the second end covers (4a3).

4. The gas-liquid pressurizing mechanism in a hydraulic station according to claim 3, characterized in that, The second end cover (4a3) is provided with a first mounting groove and a second mounting groove along the axial direction of the cylinder piston rod (4c) in sequence, the first mounting groove is close to the cylinder piston (4b) of the corresponding pressurized cylinder (4), the first mounting groove is provided with a first sealing ring (9), the second mounting groove is provided with a second sealing ring (10), the first sealing ring (9) and the second sealing ring (10) are in contact with the outer peripheral wall of the corresponding cylinder piston rod (4c), and the second end cover (4a3) is further provided with a pressure relief hole (4a35), the pressure relief hole (4a35) is located between the first mounting groove and the second mounting groove, and the pressure relief hole (4a35) penetrates the inner wall and the outer wall of the second end cover (4a3).

5. The gas-liquid pressurizing mechanism in a hydraulic station according to claim 1 or 2 or 3 or 4, characterized in that, The oil cylinder piston (3b) is provided with a central hole, the inner wall of the central hole of the oil cylinder piston (3b) is provided with an annular partition (3b1) in a protruding manner, the two cylinder piston rods (4c) are respectively inserted into the central hole of the oil cylinder piston (3b) and abut against the two sides of the partition (3b1), one of the two cylinder piston rods (4c) is provided with a connecting hole (4c1), and the other cylinder piston rod (4c) is provided with a connecting head (4c2), the connecting head (4c2) penetrates the partition (3b1) and is threadedly connected in the connecting hole (4c1).

6. The gas-liquid pressurizing mechanism in a hydraulic station according to claim 1 or 2 or 3 or 4, characterized in that, The oil cylinder piston (3b) is provided with a central hole, and the two cylinder piston rods (4c) are threadedly connected in the central hole of the oil cylinder piston (3b).

7. The gas-liquid pressurizing mechanism in a hydraulic station according to claim 1 or 2 or 3 or 4, characterized in that, The hydraulic station comprises an oil tank (1) and an oil passage block (2), the oil tank (1) comprises a tank body (1a) and a tank cover (1b), the oil passage block (2) is fixed on the top of the tank cover (1b), a gas-liquid supercharging mechanism is arranged in the oil tank (1), and two supercharging cylinders (4) are fixed on the bottom of the tank cover (1b), the oil passage block (2) is connected with an oil outlet main pipe (6), each oil outlet (5a) and each oil return port (5b) are connected with a one-way valve (7), and the one-way valves (7) arranged at the oil outlets (5a) are communicated with the oil outlet main pipe (6) through a separate oil pipe (8) respectively.

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