An oil circuit system between relays

Abstract

This utility model discloses an oil circuit system for a relay station, comprising: an oil injection pump, an oil inlet pipe, and a support pipe; the oil inlet pipe includes a main oil inlet pipe, several spare oil inlet pipes, several oil distribution connectors, and several oil branch pipes, wherein the main oil inlet pipe and the oil branch pipes are connected through the oil distribution connectors, and the main oil inlet pipe and the spare oil inlet pipes are connected through the oil distribution connectors; the support pipe includes several relay station pipes and several jacking pipes, and the oil inlet pipe and the spare oil inlet pipes are disposed within the support pipe. With the above structure, problems such as entanglement can be avoided during use, and maintenance and troubleshooting are easier when problems occur in the oil inlet system. Because of the spare oil inlet pipes, when the main oil inlet pipe is blocked or damaged, the spare oil inlet pipes can be activated, preventing the entire tunneling operation from being interrupted due to a local oil circuit failure.

Description

Technical Field

[0001] This utility model relates to the field of pipeline jacking construction technology, and in particular to an oil circuit system for a relay station. Background Technology

[0002] In the field of pipe jacking construction technology, the hydraulic system of the intermediate stations is a crucial component of the tunnel boring machine. The main function of the intermediate station hydraulic system is to supply hydraulic oil to the hydraulic cylinders (also called jacks) within these stations, converting hydraulic energy into mechanical energy. This causes the piston rods of the hydraulic cylinders to extend, thereby propelling the pipe forward and providing a continuous and stable driving force for the entire pipe jacking construction. Traditional intermediate station hydraulic systems typically consist of multiple pipes, oil pumps, oil filters, and various control valves. These components require complex arrangement and connections to achieve their functions.

[0003] Existing relay hydraulic circuit systems suffer from the following problems in practical use: Firstly, their complex piping requires multiple inlet pipes corresponding to each inlet, leading to potential entanglement during operation. Secondly, existing systems typically employ centralized oil supply, delivering hydraulic oil to various components via a single cylinder. This single-path design means that a failure or pressure instability in the main oil line directly impacts the entire system's operation, lacking redundancy. Thirdly, existing systems lack effective monitoring and control mechanisms, failing to promptly detect and address abnormal oil pressure. Finally, they lack effective backup oil circuit design; a failure in the main inlet pipe renders the entire system inoperable. Therefore, existing relay hydraulic circuit systems exhibit significant deficiencies in reliability and safety, necessitating further improvement.

[0004] Therefore, this utility model provides an intermediate oil circuit system that can effectively solve the above problems and avoid problems such as entanglement and lack of redundancy design. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides an intermediate oil circuit system that can avoid problems such as entanglement and lack of redundancy design.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An oil circuit system for a relay station includes: an oil injection pump, an oil inlet pipe, and a support pipe; the oil inlet pipe includes a main oil inlet pipe, several spare oil inlet pipes, several oil distribution connectors, and several oil branch pipes, the main oil inlet pipe and the oil branch pipes are connected through part of the oil distribution connectors, and the main oil inlet pipe and the spare oil inlet pipes are connected through another part of the oil distribution connectors; the support pipe includes several relay station pipes and several jacking pipes, the oil inlet pipes are disposed within the support pipes, several hydraulic cylinders are disposed within the relay station pipes, and the oil branch pipes are connected to the hydraulic cylinders to supply hydraulic oil to the hydraulic cylinders.

[0008] As an improvement of this utility model, the oil distributor connector is provided with an oil control solenoid valve.

[0009] As an improvement of this utility model, the oil distribution connector includes a first oil distribution connector and a second oil distribution connector. The spare oil inlet pipe is connected to the main oil inlet pipe through the first oil distribution connector, and the main oil inlet pipe is connected to the oil inlet branch pipe through the second oil distribution connector.

[0010] As an improvement of this utility model, a pressure measuring device is provided on the oil inlet main pipe between the first oil distributor connector and the second oil distributor connector.

[0011] As an improvement of this utility model, the oil inlet branch pipe includes an annular oil injection pipe, which is disposed in the intermediate pipeline, and the oil inlet branch pipe is connected to the hydraulic cylinder through the annular oil injection pipe.

[0012] As an improvement of this utility model, the hydraulic cylinder is provided with an oil inlet and an oil outlet, and the annular oil injection pipe is connected to the hydraulic cylinder through the oil inlet.

[0013] As an improvement of this utility model, the relay station pipeline includes a front relay station pipe and a rear relay station pipe, wherein the front relay station pipe and the rear relay station pipe are movably connected to cooperate with the hydraulic cylinder to retract and push forward.

[0014] As an improvement to this utility model, it also includes a return oil pipeline and an oil tank. The return oil pipeline includes a main return oil pipe and a branch return oil pipe. The main return oil pipe is connected to the branch return oil pipe, and the branch return oil pipe is connected to the hydraulic cylinder. One end of the main return oil pipe is connected to the oil tank. The branch return oil pipe includes an annular oil outlet pipe, and the branch return oil pipe is connected to the hydraulic cylinder through the annular oil outlet pipe. The annular oil outlet pipe is connected to the hydraulic cylinder through the oil outlet.

[0015] As an improvement of this utility model, a return oil control valve is provided on the return oil distribution pipe.

[0016] As an improvement to this utility model, the oil control solenoid valve is an electromagnetic ball valve.

[0017] The beneficial effects of this utility model are as follows: Through the above-described structure, the oil inlet pipeline, with its main inlet pipe, several oil distribution connectors, and several branch inlet pipes, provides a clear and straightforward connection between the pipelines. This not only avoids problems such as tangling but also facilitates maintenance and troubleshooting when issues arise in the oil inlet system. Because a backup oil inlet pipe is provided in parallel with the main inlet pipe, in the event of blockage or damage to the main inlet pipe, the oil circuit can be switched via the oil distribution connectors, allowing hydraulic oil to reach the corresponding equipment through the backup inlet pipe. This ensures that the key components of the tunnel boring machine receive continuous power support, preventing the entire tunneling operation from being interrupted due to a localized oil circuit failure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of the oil circuit system in the relay room of this utility model;

[0021] Figure 2 This is a cross-sectional structural schematic diagram of the oil circuit system in the relay room of this utility model;

[0022] Figure 3 yes Figure 2 Enlarged view of circle A;

[0023] Figure 4 This is an exploded structural diagram of the first part of the oil circuit system in the relay room of this utility model;

[0024] Figure 5 This is an exploded structural diagram of the second part of the oil circuit system in the relay room of this utility model;

[0025] Figure 6 yes Figure 5 Enlarged view of circle B;

[0026] Figure 7 This is an exploded structural diagram of the third part of the oil circuit system in the relay room of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Oil pump; 200. Oil inlet pipe; 300. Support pipe; 400. Oil return pipe; 500. Oil tank; 210. Main oil inlet pipe; 211. Pressure measuring device; 220. Spare oil inlet pipe; 230. Oil distributor connector; 231. Oil control solenoid valve; 232. First oil distributor connector; 233. Second oil distributor connector; 240. Oil inlet branch pipe; 241. Annular oil injection pipe; 310. Intermediate pipe; 311. Hydraulic cylinder; 3111. Oil inlet; 3112. Oil outlet; 312. Intermediate pipe front; 313. Intermediate pipe rear; 320. Top inlet pipe; 410. Main oil return pipe; 420. Oil return branch pipe; 421. Annular oil outlet pipe; 422. Oil return control valve. Detailed Implementation

[0029] Reference Figures 1 to 7 An inter-relay oil circuit system, comprising:

[0030] An intermediate oil circuit system includes: an oil injection pump 100, an oil inlet pipe 200, and a support pipe 300; the oil inlet pipe 200 includes a main oil inlet pipe 210, a plurality of spare oil inlet pipes 220, a plurality of oil distribution connectors 230, and a plurality of oil inlet branch pipes 240, the main oil inlet pipe 210 and the oil inlet branch pipes 240 being connected through a portion of the oil distribution connectors 230, and the main oil inlet pipe 210 and the spare oil inlet pipes 220 being connected through another portion of the oil distribution connectors 230; the support pipe 300 includes a plurality of intermediate pipes 310 and a plurality of jacking pipes 320, the oil inlet pipes 200 being disposed within the support pipe 300, the intermediate pipes 310 being provided with a plurality of hydraulic cylinders 311, and the oil inlet branch pipes 240 being connected to the hydraulic cylinders 311 to provide hydraulic oil to the hydraulic cylinders 311.

[0031] With the above-described structure, the oil inlet pipe 200, through the inclusion of the main oil inlet pipe 210, several oil distribution connectors 230, and several oil inlet branch pipes 240, provides a clear and straightforward connection between the pipelines. This not only avoids problems such as tangling but also facilitates maintenance and troubleshooting when issues arise in the oil inlet system. Because a backup oil inlet pipe 220 is provided in parallel with the main oil inlet pipe 210, in the event of blockage or damage to the main oil inlet pipe 210, the oil circuit can be switched via the oil distribution connectors 230, allowing hydraulic oil to reach the corresponding equipment through the backup oil inlet pipe 220. This ensures that key components in the tunnel boring machine's relay station receive continuous power support, preventing the entire tunneling operation from being interrupted due to localized oil circuit failures. The oil pump 100 is the power source for the entire oil circuit system. It delivers hydraulic oil to the oil inlet pipe 200 at a predetermined pressure, allowing the hydraulic oil to flow within the system and drive the relevant equipment. The main oil inlet pipe 210 serves as the primary oil delivery channel. It receives hydraulic oil from the injection pump 100 and distributes it to each of the oil distribution connectors 230, which in turn deliver it to each of the inlet branch pipes 240. The backup inlet pipe 220 enhances the reliability of the system. In the event of a failure in the main inlet pipe 210, such as a pipe rupture or blockage, the backup inlet pipe 220 can be activated to ensure the supply of hydraulic oil. The oil distribution connector 230 is a key connection and distribution component; it can rationally distribute the hydraulic oil in the main inlet pipe 210 to each of the inlet branch pipes 240, and can also connect the main inlet pipe 210 to the backup inlet pipe 220. Furthermore, the backup inlet pipe 220 can be activated when needed. The inlet branch pipes 240 deliver the hydraulic oil distributed by the oil distribution connector 230 to specific equipment locations, providing power to the equipment. The intermediate pipeline 310 and the jacking pipe 320 form an integrated support structure. The oil inlet pipe 200 and the spare oil inlet pipe 220 are installed inside the support pipe 300. This structural design protects the internal oil system from damage caused by external factors (such as formation pressure and groundwater). Simultaneously, the support pipe 300 also provides support and guidance during pipe jacking construction, ensuring the smooth progress of the jacking process.

[0032] In this embodiment, the oil distribution connector 230 is equipped with an oil control solenoid valve 231. With this structure, the oil control solenoid valve 231 can be connected to the control system for automated operation. In modern construction equipment, sensors monitor parameters such as jacking speed, jacking force, and hydraulic oil pressure, and feed this information back to the control system. The control system automatically adjusts the oil control solenoid valve 231 according to a preset program and feedback information to control the flow direction of the hydraulic oil and automatically adjust the opening of the oil control solenoid valve 231. Under normal operating conditions, the oil control solenoid valve 231 in the oil distribution connector 230, which connects the main oil inlet 210 to the branch oil inlet 240, can control the hydraulic oil to enter the branch oil inlet 240 with a predetermined flow direction, allowing the hydraulic oil to reach the corresponding intermediate hydraulic cylinder 311, providing power to push the pipeline forward. The control of each oil control solenoid valve 231 is independent, allowing the user to adjust the corresponding oil control solenoid valve 231 according to their needs.

[0033] In this embodiment, the oil distribution connector 230 includes a first oil distribution connector 232 and a second oil distribution connector 233. The spare oil inlet pipe 220 and the main oil inlet pipe 210 between two adjacent oil inlet branch pipes 240 are connected in parallel through the first oil distribution connector 232. The main oil inlet pipe 210 and the oil inlet branch pipes 240 are connected through the second oil distribution connector 233. With this structure, in use, the spare oil inlet pipe 220 and the main oil inlet pipe 210 between two adjacent oil inlet branch pipes 240 are connected in parallel through the first oil distribution connector 232. This connection method allows the spare oil inlet pipe 220 to be easily connected to the main oil circuit system. When the normal main oil inlet pipe 210 or its corresponding equipment malfunctions, the spare oil inlet pipe 220 can be quickly activated through the first oil distribution connector 232 to deliver hydraulic oil to the corresponding location, ensuring uninterrupted power supply to the equipment. The presence of the first oil distribution connector 232 allows for flexible adjustment of the oil circuit layout according to actual construction needs and possible fault conditions. Under normal operating conditions, the first oil distributor 232 balances the hydraulic oil pressure and flow rate within the main oil inlet 210. The main oil inlet 210 and the branch oil inlets 240 are connected via the second oil distributor 233. The second oil distributor 233 precisely distributes the hydraulic oil from the main oil inlet 210 to each branch oil inlet 240 and can individually control whether the hydraulic oil from the main oil inlet 210 enters any branch oil inlet 240. The second oil distributor 233 accurately delivers hydraulic oil to the appropriate locations according to construction design requirements and the needs of the equipment connected to each branch oil inlet 240, ensuring that each piece of equipment receives a suitable hydraulic oil supply for normal operation. Furthermore, the second oil distributor 233 can individually control the on / off state of any branch oil inlet 240.

[0034] In this embodiment, a pressure measuring device 211 is provided on the main oil inlet pipe 210 between the first oil distributor connector 232 and the second oil distributor connector 233. With this structure, the pressure measuring device 211 can monitor the hydraulic oil pressure in the portion of the main oil inlet pipe 210 between the first oil distributor connector 232 in real time. In pipe jacking construction, hydraulic oil pressure is a critical parameter. Appropriate pressure is a prerequisite for ensuring the normal operation of the hydraulic cylinder 311 in the relay station and for smoothly pushing the pipe forward. The pressure measuring device 211 can accurately obtain the pressure value of this part of the oil circuit. Furthermore, if this part of the main oil inlet pipe 210 experiences blockage, leakage, or other malfunctions, the pressure will change abnormally. The pressure measuring device 211 can detect such pressure anomalies in a timely manner. For example, when the pipe leaks, the hydraulic oil pressure will drop; when the pipe is blocked, the pressure will rise.

[0035] In this embodiment, the oil inlet pipe 240 includes an annular oil injection pipe 241, which is disposed within the intermediate pipeline 310. The intermediate pipeline 310 is equipped with a plurality of hydraulic cylinders 311, and the oil inlet pipe 240 is connected to the hydraulic cylinders 311 through the annular oil injection pipe 241. With this structure, during use, the annular oil injection pipe 241, disposed within the intermediate pipeline 310, helps to evenly distribute hydraulic oil to each of the hydraulic cylinders 311. In pipe jacking construction, uniform power distribution is crucial for maintaining the smooth advancement of the intermediate pipeline 310. Uneven hydraulic oil distribution may cause some hydraulic cylinders 311 to actuate first, while others actuate later, thus causing a deviation in the advancement direction of the intermediate pipeline 310 and affecting construction accuracy.

[0036] In this embodiment, the hydraulic cylinder 311 is provided with an oil inlet 3111 and an oil outlet 3112, and the annular oil injection pipe 241 is connected to the hydraulic cylinder 311 through the oil inlet 3111. With this structure, the presence of the oil inlet 3111 makes it easier to locate problems during maintenance and troubleshooting. If the hydraulic cylinder 311 malfunctions, such as failing to extend or retract, the operator can first check the hydraulic oil supply at the oil inlet 3111. For example, check for hydraulic oil leaks or foreign objects blocking the oil inlet 3111. Furthermore, when repairing or replacing the hydraulic cylinder 311, the oil inlet 3111 provides a clear disconnection and connection point. By disassembling the portion of the oil inlet 3111 connected to the annular oil injection pipe 241, the hydraulic cylinder 311 can be easily separated from the system for repair or replacement. After repair, it can be reconnected to the system through the oil inlet 3111 without causing significant interference to the entire hydraulic system.

[0037] In this embodiment, the intermediate pipeline 310 includes a front intermediate pipe 312 and a rear intermediate pipe 313. The front intermediate pipe 312 and the rear intermediate pipe 313 are movably connected to cooperate with the retraction and jacking action of the hydraulic cylinder 311. With this structural arrangement, during operation, the hydraulic cylinder 311 performs retraction and jacking actions, and the movable connection between the front intermediate pipe 312 and the rear intermediate pipe 313 effectively facilitates these actions. When the hydraulic cylinder 311 jacks, it pushes the front intermediate pipe 312 forward, while the rear intermediate pipe 313 remains relatively fixed; when the hydraulic cylinder 311 retracts, the front intermediate pipe 312 remains relatively fixed, while the rear intermediate pipe 313 moves forward. For example, in pipe jacking construction, the jacking force of the hydraulic cylinder 311 is crucial for propelling the pipeline forward. The movable connection between the front tube 312 and the rear tube 313 of the relay station allows the jacking force to be effectively transmitted to the front tube, enabling the front tube to move forward over external resistance such as soil, just as the joints of a robotic arm can extend flexibly, allowing the arm to reach the target position.

[0038] In this embodiment, a return oil pipe 400 and an oil tank 500 are also included. The return oil pipe 400 includes a main return oil pipe 410 and a branch return oil pipe 420. The main return oil pipe 410 is connected to the branch return oil pipe 420, and the branch return oil pipe 420 is connected to the hydraulic cylinder 311. One end of the main return oil pipe 410 is connected to the oil tank 500. The branch return oil pipe 420 includes an annular outlet pipe 421, which is connected to the hydraulic cylinder 311. The annular outlet pipe 421 is connected to the hydraulic cylinder 311 through an outlet port 3112. With the above structure, during use, the branch return oil pipe 420 connects to the hydraulic cylinder 311, allowing the collection of hydraulic oil discharged after the hydraulic cylinder 311 has worked. After the hydraulic cylinder 311 completes its retraction action, the hydraulic oil needs to return to the oil tank 500 for recycling. The return oil branch pipes 420 act like "small tributaries," collecting the hydraulic oil discharged from each hydraulic cylinder 311 into the "main channel" of the return oil main pipe 410. The return oil main pipe 410 then transports the collected hydraulic oil back to the oil tank 500, thus forming a complete hydraulic oil recovery system. This achieves the recycling of hydraulic oil, reducing construction costs and minimizing resource waste. Timely recovery of hydraulic oil prevents it from becoming contaminated or degraded due to prolonged exposure to the external environment. For example, at a construction site, if hydraulic oil is exposed to air, it may become contaminated with dust, moisture, and other impurities, affecting its lubrication and power transmission performance. Timely recovery of the hydraulic oil to the oil tank 500 allows for purification through filters, maintaining its good performance and extending its service life. The annular oil outlet pipe 421 surrounds the hydraulic cylinder 311; this annular structure ensures that it can evenly collect the hydraulic oil discharged from the cylinder 311. During the operation of the hydraulic cylinder 311, the movement of the piston causes hydraulic oil inside the cylinder to be discharged from the oil outlet 3112. The annular oil outlet pipe 421 helps to stabilize the return oil pressure. If the return oil process is not uniform, it may cause fluctuations in the return oil pressure. Stable return oil pressure is crucial for the normal operation of the entire hydraulic system. For example, unstable return oil pressure may affect the next operation of the hydraulic cylinder 311 or cause malfunctions in other components (such as valves) in the return oil pipe 400. The uniform return oil characteristic of the annular oil outlet pipe 421 can minimize such pressure fluctuations and ensure a smooth return oil process.

[0039] In this embodiment, a return oil control valve 422 is provided on the return oil branch pipe 420. With the above-described structure, in use, the return oil control valve 422 on the return oil branch pipe 420 allows for independent control of the return oil in different areas or circuits, achieving zoned management and precise control of the system, thereby improving the overall performance and reliability of the system.

[0040] In this embodiment, the oil control solenoid valve 231 is an electromagnetic ball valve. With the above-described structure, during use, the friction between the ball and the valve seat is small during rotation, and the moment of inertia of the ball is relatively small. Therefore, the operating torque is not large, and the required electromagnetic force is also relatively small, enabling quick and easy opening and closing. Some solenoid valves, such as electromagnetic diaphragm valves, are prone to fatigue and damage to their diaphragm and other components during long-term, frequent operation, requiring periodic replacement. In contrast, electromagnetic ball valves have lower maintenance costs and a longer service life. Furthermore, electromagnetic ball valves use a spherical seal, resulting in a relatively small sealing contact area between the ball and the valve seat, and a large sealing pressure when closed, effectively preventing media leakage. In contrast, while some other solenoid valves, such as electromagnetic butterfly valves, also have good sealing performance, the butterfly valve's seal mainly relies on the rubber sealing ring or metal sealing pair between the butterfly plate and the valve body. Under long-term use or harsh conditions, the sealing ring may age and wear, affecting the sealing effect. The spherical sealing structure of the electromagnetic ball valve is relatively more stable and reliable, maintaining good sealing performance for a longer period. The oil control solenoid valve 231 is a three-way solenoid ball valve. The three-way solenoid ball valve used by the first oil distributor connector 232 can control the hydraulic oil to enter the oil distributor 240 through the main oil inlet pipe 210 or the spare oil inlet pipe 220, and finally supply oil to the hydraulic cylinder 311. The three-way solenoid ball valve used by the second oil distributor connector 233 can control whether the hydraulic oil in the main oil inlet pipe 210 is diverted into the oil distributor 240.

[0041] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the protection scope of this utility model.

Claims

1. An inter-repeater oil line system characterized by, include: The system includes an oil pump (100), an oil inlet pipe (200), and a support pipe (300). The oil inlet pipe (200) includes a main oil inlet pipe (210), several spare oil inlet pipes (220), several oil distribution connectors (230), and several oil branch pipes (240). The main oil inlet pipe (210) and the oil branch pipes (240) are connected through a portion of the oil distribution connectors (230). The main oil inlet pipe (210) is connected to the spare oil inlet pipes (220). The oil distribution connector (230) is connected through another part; the support pipe (300) includes several intermediate pipes (310) and several jacking pipes (320), the oil inlet pipe (200) is arranged in the support pipe (300), several hydraulic cylinders (311) are arranged in the intermediate pipes (310), and the oil inlet branch pipe (240) is connected to the hydraulic cylinders (311) to provide hydraulic oil to the hydraulic cylinders (311).

2. An inter-repeater oil circuit system as set forth in claim 1, wherein The oil distribution connector (230) is equipped with an oil control solenoid valve (231).

3. The oil circuit system between relay stations according to claim 2, characterized in that, The oil distribution connector (230) includes a first oil distribution connector (232) and a second oil distribution connector (233). The spare oil inlet pipe (220) is connected to the main oil inlet pipe (210) through the first oil distribution connector (232), and the main oil inlet pipe (210) is connected to the oil inlet branch pipe (240) through the second oil distribution connector (233).

4. The oil circuit system between relay stations according to claim 3, characterized in that, A pressure measuring device (211) is provided on the oil inlet pipe (210) between the first oil distributor connector (232) and the second oil distributor connector (233).

5. The oil circuit system between relay stations according to claim 1, characterized in that, The oil inlet branch pipe (240) includes an annular oil injection pipe (241), which is located inside the intermediate pipeline (310). The oil inlet branch pipe (240) is connected to the hydraulic cylinder (311) through the annular oil injection pipe (241).

6. The oil circuit system between relay stations according to claim 5, characterized in that, The hydraulic cylinder (311) is provided with an oil inlet (3111) and an oil outlet (3112), and the annular oil injection pipe (241) is connected to the hydraulic cylinder (311) through the oil inlet (3111).

7. The oil circuit system between relay stations according to claim 6, characterized in that, The intermediate pipeline (310) includes an intermediate front pipe (312) and an intermediate rear pipe (313). The intermediate front pipe (312) and the intermediate rear pipe (313) are movably connected to cooperate with the hydraulic cylinder (311) to retract and push forward.

8. The oil circuit system between relay stations according to claim 6, characterized in that, It also includes a return oil pipe (400) and an oil tank (500). The return oil pipe (400) includes a main return oil pipe (410) and a branch return oil pipe (420). The main return oil pipe (410) is connected to the branch return oil pipe (420), and the branch return oil pipe (420) is connected to the hydraulic cylinder (311). One end of the main return oil pipe (410) is connected to the oil tank (500). The branch return oil pipe (420) includes an annular outlet pipe (421). The branch return oil pipe (420) is connected to the hydraulic cylinder (311) through the annular outlet pipe (421). The annular outlet pipe (421) is connected to the hydraulic cylinder (311) through the outlet port (3112).

9. The oil circuit system between relay stations according to claim 8, characterized in that, The return oil branch pipe (420) is equipped with a return oil control valve (422).

10. The oil circuit system between relay stations according to claim 2, characterized in that, The oil control solenoid valve (231) is a solenoid ball valve.

Images