Main jacking hydraulic system for pipe jacking construction

Abstract

The utility model provides a main jacking hydraulic system for pipe jacking construction. The main jacking hydraulic system comprises an oil cylinder module, a stroke sensor, a first control module, a second control module, two first one-way valves and an oil tank. The first control module comprises a first motor and a first plunger pump. The second control module comprises a second motor and a second plunger pump. Oil inlets of the first plunger pump and the second plunger pump are both connected with an oil outlet of the oil tank. And oil outlets of the first plunger pump and the second plunger pump are respectively connected with a first one-way valve. The oil cylinder module comprises a plurality of oil cylinders arranged in parallel, electromagnetic reversing valves and pilot overflow valves, wherein the electromagnetic reversing valves and the pilot overflow valves are arranged in one-to-one correspondence with the oil cylinders. The stroke sensor is installed on one side of the oil cylinder so as to monitor the displacement amount of the oil cylinder. The utility model solves the problems that the oil cylinder slowly extends out to lead to overlong extending time of the oil cylinder and waste of working time, and achieves the purpose of improving the pipe jacking construction efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic equipment technical field especially is related to a main top hydraulic system for pipe jacking construction. BACKGROUND

[0002] In pipe jacking construction, the main top hydraulic system is a very important component, which provides the pushing power for the forward action of the pipe jacking machine and the whole pipeline. The existing pipe jacking machine includes a hydraulic pump, a reversing valve and a cylinder. In the pipe jacking construction process, in order to avoid the collision between the cylinder and the pressure equalizing ring caused by the too fast moving speed of the cylinder, the extension speed of the cylinder is usually relatively slow.

[0003] However, the slow extension of the cylinder will lead to the overlong extension time of the cylinder, wasting the working time and thus reducing the efficiency of the pipe jacking construction. SUMMARY

[0004] In view of the above problems, the utility model is provided to overcome the above problems or at least partially solve the above problems, and the main top hydraulic system for pipe jacking construction can solve the problem of overlong extension time of the cylinder caused by the slow extension of the cylinder, waste the working time and improve the efficiency of the pipe jacking construction.

[0005] Specifically, the utility model provides a main top hydraulic system for pipe jacking construction. The main top hydraulic system comprises a cylinder module, a stroke sensor, a first control module, a second control module, two first check valves and an oil tank.

[0006] The first control module and the second control module are arranged in parallel and are connected to the cylinder module. The first control module comprises a first motor and a first plunger pump, and the output end of the first motor is fixedly connected to the input end of the first plunger pump. The second control module comprises a second motor and a second plunger pump, and the output end of the second motor is fixedly connected to the input end of the second plunger pump. The oil inlet of the first plunger pump and the oil inlet of the second plunger pump are connected to the oil outlet of the oil tank. The oil outlets of the first plunger pump and the second plunger pump are respectively connected to one of the first check valves.

[0007] The cylinder module comprises a plurality of cylinders arranged in parallel and an electromagnetic reversing valve and a pilot relief valve arranged in one-to-one correspondence with the cylinders. The P port of the electromagnetic reversing valve is in communication with two first check valves arranged in parallel, and the T port of the electromagnetic reversing valve is in communication with the oil tank. The two ends of the pilot relief valve are respectively connected to the oil tank and the rod cavity of the cylinder.

[0008] The stroke sensor is installed on one side of the cylinder to monitor the displacement of the cylinder.

[0009] Optionally, the oil cylinder module further includes a quick-return bypass valve provided in one-to-one correspondence with the oil cylinder, and two ends of the quick-return bypass valve are respectively connected to the rodless chamber of the oil cylinder and the oil tank.

[0010] Optionally, the oil cylinder module further includes pressure measuring points arranged in a one-to-one correspondence with the oil cylinders, and the pressure measuring points are connected to the rodless chamber of the oil cylinder.

[0011] Optionally, the electromagnetic reversing valve is a Y-type three-position four-way electromagnetic reversing valve.

[0012] The cylinder module also includes a hydraulically controlled one-way valve and a second one-way valve, each corresponding to the cylinder. The two ends of the hydraulically controlled one-way valve are connected to the oil outlet of the solenoid reversing valve and the rodless chamber of the cylinder, respectively. The second one-way valve is connected between the T-port of the solenoid reversing valve and the oil tank.

[0013] Optionally, the main jack hydraulic system further includes a first pressure-regulating valve group, a second pressure-regulating valve group, a pressure gauge, and a pressure sensor. The first pressure-regulating valve group is connected at both ends to the oil outlet of the first plunger pump and the oil tank, respectively. The second pressure-regulating valve group is connected at both ends to the oil outlet of the second plunger pump and the oil tank, respectively. The pressure gauge and pressure sensor are arranged in series and connected to the oil outlets of the first and second plunger pumps.

[0014] Optionally, a filter is connected between the first one-way valve and the cylinder module.

[0015] Optionally, the main top hydraulic system further includes a cooler, which is connected between the cylinder module and the oil tank, so that the hydraulic oil flowing out of the cylinder module passes through the cooler and then enters the oil tank.

[0016] Optionally, the main top hydraulic system further includes a temperature sensor, which is installed on the oil tank to monitor the real-time temperature of the oil tank.

[0017] Optionally, there are two stroke sensors, and the two stroke sensors are respectively connected to the two oil cylinders at the lower left and lower right of the pipe jacking machine in the excavation direction.

[0018] Optionally, the main top hydraulic system further comprises a console provided with a plurality of operating buttons and a touch screen for controlling the operation of the hydraulic system. And / or,

[0019] The main top hydraulic system also includes a remote wired remote controller for remotely controlling the operation of the hydraulic system.

[0020] In the main top hydraulic system of the present invention, when the cylinder begins to extend, the two oil pump motors of the hydraulic system are started at the same time, so that the cylinder is in a fast forward state. When the cylinder is about to connect with the pressure equalizing ring, the hydraulic system is converted to start only a single oil pump motor, so that the cylinder is in a working forward state, so as to avoid collision between the cylinder and the pressure equalizing ring due to excessively fast movement of the cylinder.

[0021] First, the cylinder is put into fast forward state, and then the displacement of the cylinder is monitored by the stroke sensor, so that the moving speed of the cylinder is reduced when the cylinder approaches the pressure equalizing ring, so that the overall time required for the extension process of the cylinder is shortened, and the efficiency of the pipe jacking construction is improved.

[0022] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 This is a hydraulic principle diagram of the main roof hydraulic system according to one embodiment of the utility model;

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0027] List of reference numerals: 1. Cylinder; 2. Quick-change connector; 3. Quick-return bypass valve; 4. Pilot relief valve; 5. Solenoid reversing valve; 6. Stroke sensor; 7. First motor; 8. First plunger pump; 9. First pressure-regulating valve group; 10. Cooler; 11. Oil tank; 12. Pressure gauge; 13. Pressure sensor; 14. Filter; 15. Hydraulic-controlled one-way valve; 16. Second one-way valve; 18. Second motor; 19. Second plunger pump; 20. Temperature sensor; 21. Second pressure-regulating valve group; 22. First one-way valve; 23. Pressure measuring point. DETAILED DESCRIPTION

[0028] Refer to the following Figures 1 to 3To describe the main top hydraulic system for pipe jacking construction of an embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0029] Unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," "fixed," and "coupled" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly limited. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. That is, in the description of this embodiment, the first feature being "above," "above," and "above" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below," "below," or "below" the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of the present embodiment, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0032] Figure 1 This is a hydraulic principle diagram of the main top hydraulic system according to an embodiment of the utility model, as shown in FIG. Figure 1 As shown, and reference Figures 2 to 3 The embodiment of the present invention provides a main jacking hydraulic system for pipe jacking construction. The main jacking hydraulic system includes a cylinder module, a stroke sensor 6, a first control module, a second control module, two first one-way valves 22 and an oil tank 11.

[0033] The first control module and the second control module are arranged in parallel and are both connected to the cylinder module. The first control module includes a first motor 7 and a first plunger pump 8, and the output end of the first motor 7 is fixedly connected to the input end of the first plunger pump 8. The second control module includes a second motor 18 and a second plunger pump 19, and the output end of the second motor 18 is fixedly connected to the input end of the second plunger pump 19. The oil inlets of the first plunger pump 8 and the second plunger pump 19 are both connected to the oil outlet of the oil tank 11. The oil outlets of the first plunger pump 8 and the second plunger pump 19 are respectively connected to a first one-way valve 22.

[0034] The cylinder module includes multiple cylinders 1 connected in parallel, along with solenoid reversing valves 5 and pilot relief valves 4, each corresponding to one cylinder 1. The P port of the solenoid reversing valve 5 communicates with two parallel-connected first check valves 22, while the T port of the solenoid reversing valve 5 communicates with the oil tank 11. The two ends of the pilot relief valve 4 are connected to the oil tank 11 and the rod chamber of the cylinder 1, respectively.

[0035] The stroke sensor 6 is installed on one side of the oil cylinder 1 to monitor the displacement of the oil cylinder 1 .

[0036] In this embodiment, multiple cylinders 1 are arranged in parallel. By adjusting the state of the electromagnetic reversing valve 5, any number of combinations of the multiple cylinders 1 can be achieved. The connecting pipes of the cylinders 1 are connected to the oil pipes using quick-change connectors 2 to simplify the installation between the cylinders 1 and the oil pipes and improve the connection efficiency between the cylinders 1 and the oil pipes.

[0037] The main jacking hydraulic system includes a first control module and a second control module, wherein there are two oil pump motors, namely a first motor 7 and a second motor 18. During the pipe jacking construction process, only one of the two oil pump motors can be started, and the other is kept as a backup. In order to switch to the backup oil pump motor in time when one oil pump motor fails, the work efficiency of the pipe jacking construction can be improved. In addition, the design of the two oil pump motors can also start only the first motor 7 and the first plunger pump 8, or only the second motor 18 and the second plunger pump 19 during the working process. When fast forward or fast reverse, the first motor 7, the first plunger pump 8 and the second motor 18, the second plunger pump 19 are started at the same time to increase the supply flow, thereby increasing the extension and retraction speed of the oil cylinder 1 to achieve the purpose of fast forward or fast reverse.

[0038] The stroke sensor 6 is used for monitoring the extension state of the oil cylinder 1.

[0039] In the pipe jacking construction process, the oil cylinder 1 is first in the fast forward state, and then the displacement of the oil cylinder 1 is monitored through the stroke sensor 6, so that the moving speed of the oil cylinder 1 is reduced when the oil cylinder 1 approaches the pressure equalizing ring, the overall time required for the extension process of the oil cylinder 1 is shortened, and the pipe jacking construction efficiency is improved.

[0040] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The oil cylinder module further comprises a fast return bypass valve 3 corresponding to each oil cylinder 1, and the two ends of the fast return bypass valve 3 are connected to the rodless cavity of the oil cylinder 1 and the oil tank 11.

[0041] In the embodiment, the oil cylinder 1 is in the fast return state when the fast return bypass valve 3 is powered on. The fast return bypass is closed when the fast return bypass valve 3 is powered off. When the oil cylinder 1 needs to be in the fast return state, the first motor 7, the first plunger pump 8, the second motor 18 and the second plunger pump 19 can be started at the same time, and the fast return bypass valve 3 is powered on to realize the rapid return of hydraulic oil to the oil tank 11, so that the speed of the oil cylinder 1 during the contraction is increased to achieve the purpose of fast return, and the back pressure of the oil return path is not caused due to reasons such as large flow and oil path blockage, the back pressure phenomenon during the return of conventional hydraulic oil to the oil tank 11 is reduced, and the safety of the hydraulic system is improved.

[0042] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The oil cylinder module further comprises a pressure measuring point 23 corresponding to each oil cylinder 1, and the pressure measuring point 23 is connected to the rodless cavity of the oil cylinder 1.

[0043] In the embodiment, the pilot relief valve 4 is used for adjusting the relief pressure of each oil cylinder 1, and the pressure measuring point 23 is used for monitoring the pressure in the rodless cavity of each oil cylinder 1. According to the pressure value measured by the pressure measuring point 23, the pilot relief valve 4 is controlled to make the pressure in the rodless cavity of each oil cylinder 1 consistent, so as to achieve the effect of uniform pipe jacking.

[0044] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The electromagnetic reversing valve 5 is a Y-type three-position four-way electromagnetic reversing valve.

[0045] The cylinder module also includes a hydraulically controlled one-way valve 15 and a second one-way valve 16, each corresponding to one of the cylinders 1. The two ends of the hydraulically controlled one-way valve 15 are connected to the oil outlet of the solenoid reversing valve 5 and the rodless chamber of the cylinder 1, respectively. The second one-way valve 16 is connected between the T port of the solenoid reversing valve 5 and the oil tank 11.

[0046] In this embodiment, the hydraulically controlled one-way valve 15 is used to control the hydraulic oil so that it can only flow along the oil outlet of the solenoid reversing valve 5 toward the rodless chamber of the oil cylinder 1, so that the hydraulic oil in the rodless chamber of the oil cylinder 1 cannot flow back to the oil outlet of the solenoid reversing valve 5 through the hydraulically controlled one-way valve 15. The second one-way valve 16 is used to control the hydraulic oil so that it can only flow along the T-port of the solenoid reversing valve 5 toward the oil tank 11, so that the hydraulic oil in the oil tank 11 cannot flow back to the T-port of the solenoid reversing valve 5 through the second one-way valve 16. The connection between the Y-type three-position four-way solenoid reversing valve and the hydraulically controlled one-way valve 15 and the second one-way valve 16 allows the oil cylinder 1 to automatically lock when the hydraulic system is powered off, preventing the oil cylinder 1 from rebounding and improving the safety of the hydraulic system.

[0047] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the main jack hydraulic system also includes a first pressure regulating valve group 9, a second pressure regulating valve group 21, a pressure gauge 12, and a pressure sensor 13. The two ends of the first pressure regulating valve group 9 are respectively connected to the oil outlet of the first plunger pump 8 and the oil tank 11. The two ends of the second pressure regulating valve group 21 are respectively connected to the oil outlet of the second plunger pump 19 and the oil tank 11. The pressure gauge 12 and pressure sensor 13 are arranged in series and connected to the oil outlets of the first plunger pump 8 and the second plunger pump 19.

[0048] In this embodiment, the oil outlets of the first plunger pump 8 and the second plunger pump 19 are both designed with a pressure regulating valve group and a pressure sensor 13, which are used to adjust the pressure of the hydraulic system according to different working conditions, so that the pressure of the hydraulic system can be adjusted steplessly. In this way, the movement speed of the oil cylinder 1 does not form a sudden change in the initial stage of the oil cylinder 1 working, so that the thrust of the oil cylinder 1 increases steadily, thereby making the top advancement of the oil cylinder 1 more stable. The pressure gauge 12 is used to monitor the oil outlet pressure of the first plunger pump 8 and the second plunger pump 19, so that the operator can observe the oil outlet pressure of the first plunger pump 8 and the second plunger pump 19 in real time through the pressure gauge 12.

[0049] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, a filter 14 is connected between the first one-way valve 22 and the cylinder module.

[0050] In the embodiment, the hydraulic oil is filtered again after passing through the filter 14 before entering the oil cylinder module, so that the hydraulic oil entering the oil cylinder module is filtered, thereby avoiding the oil cylinder 1 and other components from being polluted by impurities or air, or even being blocked and damaged, and improving the service life of the oil cylinder module.

[0051] In some embodiments of the utility model, as shown in Figure 1 and Figure 3 The main roof hydraulic system further comprises a cooler 10, which is connected between the oil cylinder module and the oil tank 11, so that the hydraulic oil flowing out of the oil cylinder module enters the oil tank 11 after passing through the cooler 10.

[0052] In the embodiment, during the operation of the oil cylinder module, the hydraulic oil will generate a certain amount of heat due to friction, compression and other reasons, which can easily cause the hydraulic system to overheat, and even cause the components in the hydraulic system to be damaged. The cooler 10 has the function of cooling the hydraulic oil, so as to control the temperature of the hydraulic oil within a suitable range, thereby avoiding the damage of the components in the hydraulic system caused by the high temperature of the hydraulic oil, and improving the service life of the components in the hydraulic system.

[0053] In some embodiments of the utility model, as shown in Figure 1 and Figure 3 The main roof hydraulic system further comprises a temperature sensor 20, which is installed on the oil tank 11 to monitor the real-time temperature of the oil tank 11.

[0054] In the embodiment, the temperature sensor 20 is used to monitor the temperature of the hydraulic oil in the oil tank 11 in real time, so that the operator can grasp the temperature of the hydraulic oil at any time.

[0055] In some embodiments of the utility model, when the temperature of the hydraulic oil in the oil tank 11 exceeds the preset safety range, the temperature sensor 20 will send a warning signal to remind the operator.

[0056] In some embodiments of the utility model, the cooler 10 and the temperature sensor 20 are electrically connected with the controller, the temperature sensor 20 feeds back the monitored temperature to the controller, and the controller adjusts the working state of the cooler 10 according to the temperature in the oil tank 11, so that the temperature of the hydraulic oil is always maintained within a suitable range, thereby improving the stability of the system.

[0057] In some embodiments of the utility model, the oil cylinder 1 is 10.

[0058] In some embodiments of the utility model, the stroke sensor 6 is two, and the two stroke sensors 6 are respectively connected to the two oil cylinders 1 below the left and right of the heading direction of the pipe jacking machine.

[0059] In this embodiment, the oil cylinders 1 on the left and right sides of the excavation direction are Figure 1 Two stroke sensors 6 are respectively connected to the 4# oil cylinder and the 7# oil cylinder to monitor the pushing distance.

[0060] Moreover, by providing two stroke sensors 6 , the readings of the two stroke sensors 6 can be compared to improve the accuracy of the stroke sensor 6 in monitoring the pushing distance, while also avoiding the situation where the manufacturing cost of the hydraulic system is higher due to providing more stroke sensors 6 .

[0061] Furthermore, the stroke sensor 6 is electrically connected to a display, and the pushing distance is displayed on the display, eliminating the need for an operator to manually measure the distance on site.

[0062] In some embodiments of the present invention, the main roof hydraulic system further includes a console, which is provided with a plurality of operating buttons and a touch screen for controlling the operation of the hydraulic system.

[0063] The operating buttons and the touch screen are electrically connected to the controller, and the controller is electrically connected to the first motor 7 , the second motor 18 and the electromagnetic reversing valve 5 .

[0064] In this embodiment, the start or pause of the first motor 7 and the second motor 18 and the extension and retraction of the oil cylinder 1 can be controlled by operating buttons or a touch screen.

[0065] In some embodiments of the present invention, the speed of the first motor 7 or the second motor 18 is adjusted by operating a button or using a PLC program set in the touch screen, so that the first motor 7 drives the first plunger pump 8 or the second motor 18 drives the second plunger pump 19, so as to steplessly adjust the output flow of the first plunger pump 8 or the second plunger pump 19, thereby achieving stepless adjustment of the extension or retraction speed of the cylinder 1.

[0066] In some embodiments of the present invention, the controller is also electrically connected to the first pressure regulating valve group 9 and the second pressure regulating valve group 21 .

[0067] In this embodiment, the pressure of the hydraulic system can be adjusted and set in real time by operating buttons or a touch screen according to actual required working conditions.

[0068] In some embodiments of the present invention, an indicator light is provided on the console to send out signals such as machine failure or completion of a preset operation.

[0069] In some embodiments of the present invention, the console has a waterproof function.

[0070] In some embodiments of the present invention, the main roof hydraulic system further includes a remote wired remote controller for remotely controlling the operation of the hydraulic system.

[0071] The remote wired remote controller is electrically connected to the controller, and the controller is electrically connected to the first motor 7 , the second motor 18 and the electromagnetic reversing valve 5 .

[0072] In this embodiment, the start or pause of the first motor 7 and the second motor 18 and the extension and retraction of the oil cylinder 1 can be controlled by operating buttons or a touch screen.

[0073] In some embodiments of the present invention, an indicator light is provided on the remote wired remote controller to send out signals such as machine failure or completion of a preset operation.

[0074] In some embodiments of the present invention, the remote wired remote controller has a waterproof function.

[0075] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention can be directly determined or deduced from the contents disclosed herein without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A main jacking hydraulic system for pipe jacking construction, characterized in that: It includes a cylinder module, a stroke sensor, a first control module, a second control module, two first one-way valves and a fuel tank; The first control module and the second control module are arranged in parallel and are both connected to the cylinder module; the first control module includes a first motor and a first plunger pump, and the output end of the first motor is fixedly connected to the input end of the first plunger pump; the second control module includes a second motor and a second plunger pump, and the output end of the second motor is fixedly connected to the input end of the second plunger pump; the oil inlets of the first plunger pump and the second plunger pump are both connected to the oil outlet of the oil tank; the oil outlets of the first plunger pump and the second plunger pump are respectively connected to one of the first one-way valves; The cylinder module includes a plurality of oil cylinders arranged in parallel and an electromagnetic reversing valve and a pilot relief valve arranged in a one-to-one correspondence with the oil cylinders; the P port of the electromagnetic reversing valve is connected to the two first one-way valves arranged in parallel, and the T port of the electromagnetic reversing valve is connected to the oil tank; the two ends of the pilot relief valve are respectively connected to the oil tank and the rod chamber of the oil cylinder; The stroke sensor is installed on one side of the oil cylinder to monitor the displacement of the oil cylinder.

2. The main top hydraulic system according to claim 1, characterized in that: The oil cylinder module further includes a quick-return bypass valve provided in one-to-one correspondence with the oil cylinder, and two ends of the quick-return bypass valve are respectively connected to the rodless chamber of the oil cylinder and the oil tank.

3. The main jack hydraulic system according to claim 1, characterized in that: The oil cylinder module further includes pressure measuring points arranged in a one-to-one correspondence with the oil cylinders, and the pressure measuring points are connected to the rodless chamber of the oil cylinder.

4. The main jack hydraulic system according to claim 1, characterized in that: The solenoid reversing valve is a Y-type three-position four-way solenoid reversing valve; The cylinder module also includes a hydraulically controlled one-way valve and a second one-way valve arranged in one-to-one correspondence with the cylinder, and the two ends of the hydraulically controlled one-way valve are respectively connected to the oil outlet of the electromagnetic reversing valve and the rodless chamber of the cylinder; the second one-way valve is connected between the T port of the electromagnetic reversing valve and the oil tank.

5. The main jack hydraulic system according to claim 1, characterized in that: The main top hydraulic system also includes a first pressure regulating valve group, a second pressure regulating valve group, a pressure gauge and a pressure sensor; the two ends of the first pressure regulating valve group are respectively connected to the oil outlet of the first plunger pump and the oil tank; the two ends of the second pressure regulating valve group are respectively connected to the oil outlet of the second plunger pump and the oil tank; the pressure gauge and the pressure sensor are arranged in series and connected to the oil outlets of the first plunger pump and the second plunger pump.

6. The main jack hydraulic system according to claim 1, characterized in that: A filter is connected between the first one-way valve and the oil cylinder module.

7. The main jack hydraulic system according to claim 1, characterized in that: The main jack hydraulic system further includes a cooler connected between the cylinder module and the oil tank, so that the hydraulic oil flowing out of the cylinder module passes through the cooler and then enters the oil tank.

8. The main jack hydraulic system according to claim 1, characterized in that: The main top hydraulic system further includes a temperature sensor, which is installed on the oil tank to monitor the real-time temperature of the oil tank.

9. The main jack hydraulic system according to claim 1, characterized in that: There are two stroke sensors, and the two stroke sensors are respectively connected to the two oil cylinders at the lower left and lower right of the pipe jacking machine in the excavation direction.

10. The main jack hydraulic system according to claim 1, characterized in that: The main top hydraulic system also includes a console, which is provided with multiple operating buttons and a touch screen for controlling the operation of the hydraulic system; and / or the main top hydraulic system also includes a remote wired remote control for remotely controlling the operation of the hydraulic system.

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