A mud control system and pipe jacking machine

Abstract

The present invention provides a mud control system and a pipe jacking machine, wherein the P port and the S port of the hydraulic pump are connected to the first solenoid valve, the P1 port of the second solenoid valve and the hydraulic oil tank through pipelines, the T1 ports of the first solenoid valve and the second solenoid valve are connected to the hydraulic oil tank through pipelines, the P2 port of the first solenoid valve is connected to the rodless chamber of the first hydraulic oil cylinder and the rod chamber of the second hydraulic oil cylinder through a hydraulic lock, the P3 port of the second solenoid valve is connected to the rod chamber of the first hydraulic oil cylinder and the rodless chamber of the second hydraulic oil cylinder through a hydraulic lock, the conversion switch is connected to the first solenoid valve and the second solenoid valve through a relay contact circuit, and the limit switch I and the limit switch II are connected to the relay I and the relay II through a circuit. The present invention adopts the control device to effectively ensure the reliability of mud feeding, mud discharge and pipeline cleaning when the pipe jacking machine is working, and achieve the purpose of energy saving and environmental protection.

Description

Technical Field

[0001] The invention relates to a pipe jacking machine, in particular to a mud control system and a pipe jacking machine. Background Art

[0002] Pipe jacking construction is a method of underground pipeline construction. It does not require excavation of the surface layer and can cross roads, railways, rivers, ground buildings, underground buildings and various underground pipelines. Pipe jacking construction uses the thrust of the main jacking cylinder and the pipeline relay room to push the tool pipe or tunnel boring machine from the working well through the soil layer to the receiving well for lifting. At the same time, the pipeline following the tool pipe or tunnel boring machine is buried between the two wells, in order to realize the construction method of trenchless laying of underground pipelines. During the construction of the pipe jacking machine, the jacking machine head rotates and moves forward. At the same time, mud with a certain pressure is pumped into the slurry inlet pipe through the mud pump. The thixotropic mud sleeve is used to reduce the friction between the pipe wall and the soil during the jacking process, and the lost soil is filled to reduce soil deformation, settlement and water isolation. Therefore, mud or water is pumped into the pipeline, and then discharged into the mud pool through the pipeline. After sedimentation, it is reused again, which not only reduces the construction cost but also avoids secondary pollution, achieving the purpose of energy saving and environmental protection. Summary of the invention

[0003] The present invention provides a mud control system, which can meet the needs of users to use simple electro-hydraulic control and mechanical structure to safely and effectively open or close the mud supply and recovery structure according to the construction needs of users, and safely and effectively open the water supply and cleaning structure after work stops or construction is completed, thereby ensuring the construction progress and construction safety of the pipe jacking machine and achieving the purpose of energy saving and environmental protection.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] A mud control system, including a hydraulic control part, an electrical control part and a mechanical transmission part; the hydraulic control part includes a hydraulic pump, a first solenoid valve, a second solenoid valve, a first hydraulic cylinder and a second hydraulic cylinder; the hydraulic pump is fixed on an AC motor, the P port of the hydraulic pump is connected to the P1 ports of the first solenoid valve and the second solenoid valve through a pipeline, and the S port of the hydraulic pump is connected to the hydraulic oil tank through a pipeline; the T1 ports of the first solenoid valve and the second solenoid valve are connected to the hydraulic oil tank through a pipeline, the P2 port of the first solenoid valve is connected to the rodless chamber of the first hydraulic cylinder and the rod chamber of the second hydraulic cylinder, and the P3 port of the second solenoid valve is connected to the rod chamber of the first hydraulic cylinder and the rodless chamber of the second hydraulic cylinder; the electrical control part includes a conversion switch , limit switch I, limit switch II, relay I, relay II; one end of the conversion switch is connected to the positive pole of the first solenoid valve through the normally closed contact of relay I, and the 7th end of the conversion switch is connected to the positive pole of the second solenoid valve through the normally closed contact of relay II; two ends of the limit switch I are connected to the positive pole of relay I through the circuit, and two ends of the limit switch II are connected to the positive pole of relay II through the circuit; the mechanical transmission part includes a gear rotating structure, a slurry discharge pipe, a slurry inlet pipe, a stop valve C, a stop valve A, a bypass valve, a stop valve B and an induction plate; the first hydraulic cylinder and the second hydraulic cylinder are connected to the gear rotating structure, the stop valve C, the stop valve A, the bypass valve, and the stop valve B are respectively installed in the mud pipeline, and the induction plate is installed on the upper end surface of the gear rotating structure.

[0006] Furthermore, the hydraulic pump provides rotational power by connecting to a three-phase AC asynchronous motor.

[0007] Furthermore, the high-pressure P port of the hydraulic pump is connected to a safety valve.

[0008] Furthermore, a hydraulic lock is installed between the first solenoid valve, the second solenoid valve and the first hydraulic cylinder, and the second hydraulic cylinder.

[0009] Furthermore, the limit switch I and the limit switch II are non-contact induction switches.

[0010] Furthermore, the conversion switch is a bidirectional self-resetting switch.

[0011] Furthermore, the joint surfaces of the first hydraulic cylinder and the second hydraulic cylinder with the gear rotating structure are processed into rack structures and mesh with the gears of the gear rotating structure.

[0012] Furthermore, the bypass valve is installed in the pipe connecting the slurry discharge pipe and the slurry inlet pipe, the stop valve A and the stop valve B are installed in the pipes of the slurry discharge pipe and the slurry inlet pipe respectively, and the stop valve C is installed in the external circulation pipe.

[0013] Furthermore, the gear rotating structure can rotate clockwise or counterclockwise.

[0014] A pipe jacking machine has the above-mentioned mud control system.

[0015] Beneficial effects of the present invention:

[0016] The present invention utilizes a conversion switch to control the extension and retraction of a hydraulic cylinder by energizing or de-energizing a first solenoid valve and a second solenoid valve, utilizes teeth on the side of the hydraulic cylinder to drive a gear rotating structure, and the gear rotating structure drives the opening and closing of a bypass valve, a stop valve A, a stop valve B and a stop valve C, thereby achieving the purpose of slurry feeding, slurry discharge and flushing of mud pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It is a schematic diagram of the hydraulic control principle of the present invention;

[0019] Figure 2 It is a schematic diagram of the electrical control principle of the present invention;

[0020] Figure 3 It is a schematic diagram of the mechanical transmission of the present invention;

[0021] Figure 4 It is a schematic diagram of a mud pipeline of the present invention.

[0022] In the figure: 1. three-phase AC asynchronous motor, 2. hydraulic pump, 3. first solenoid valve, 4. first hydraulic cylinder, 5. second hydraulic cylinder, 6. second solenoid valve, 7. hydraulic oil tank, 8. conversion switch, 9. limit switch I, 10. limit switch II, 11. relay II, 12. relay I, 13. induction plate, 14. gear rotation structure, 15. slurry discharge pipe, 16. slurry inlet pipe, 17. stop valve C, 18. stop valve A, 19. bypass valve, 20. stop valve B, 21. external circulation pipeline, 22. safety valve, 23. hydraulic lock. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0024] like Figures 1 to 4 As shown, a mud control system includes a hydraulic control part, an electrical control part and a mechanical transmission part.

[0025] The hydraulic control part includes a hydraulic pump 2, a first solenoid valve 3, a second solenoid valve 6, a first hydraulic cylinder 4, a second hydraulic cylinder 5, and a hydraulic lock 23; the hydraulic pump 2 is fixed on the AC motor 1 through a connecting plate, the P port of the hydraulic pump 2 is connected to the P1 port of the first solenoid valve 3 and the second solenoid valve 6 through a pipeline, and the S port of the hydraulic pump 2 is connected to the hydraulic oil tank 7 through a pipeline; the T1 port of the first solenoid valve 3 and the second solenoid valve 6 is connected to the hydraulic oil tank 7 through a pipeline, the P2 port of the first solenoid valve 3 is connected to the rodless chamber of the first hydraulic cylinder 4 and the rod chamber of the second hydraulic cylinder 5 through the hydraulic lock 23, and the P3 port of the second solenoid valve 6 is connected to the rod chamber of the first hydraulic cylinder 4 and the rodless chamber of the second hydraulic cylinder 5 through the hydraulic lock 23.

[0026] The electrical control part includes a conversion switch 8, a limit switch I9, a limit switch II10, a relay I12, and a relay II11; the positive pole of the power supply VCC is connected to the three ends of the conversion switch 8, and one end of the limit switch I9 and the limit switch II10 through a circuit; one end of the conversion switch 8 is connected to the positive pole of the first solenoid valve 3 through the normally closed contact of the relay I12, and the seven ends of the conversion switch 8 are connected to the positive pole of the second solenoid valve 6 through the normally closed contact of the relay II11, and the negative poles of the first solenoid valve 3 and the second solenoid valve 6 are connected to the negative pole of the power supply through the circuit; the two ends of the limit switch I9 are connected to the positive pole of the relay I12 through the circuit, the two ends of the limit switch II10 are connected to the positive pole of the relay II11 through the circuit, and the negative poles of the limit switch I9, the three ends of the limit switch II10, the relay I12, and the relay II11 are connected to the negative pole of the power supply through the circuit.

[0027] The mechanical transmission part includes a gear rotating structure 14, a slurry discharge pipe 15, a slurry inlet pipe 16, a stop valve C17, a stop valve A18, a bypass valve 19, a stop valve B20 and an induction plate 13; the joint surfaces of the first hydraulic cylinder 4, the second hydraulic cylinder 5 and the gear rotating structure 14 are processed into a rack structure, and are meshed with the gears of the gear rotating structure 14, the stop valve C17) is installed in the external circulation pipeline, the bypass valve 19 is installed in the pipeline connecting the slurry discharge pipe 15 and the slurry inlet pipe 16, the stop valve A18 and the stop valve B20 are respectively installed in the pipelines of the slurry discharge pipe 15 and the slurry inlet pipe 16, and the induction plate is installed on the upper end surface of the gear rotating structure 14.

[0028] It should be noted that: the power source preferably adopts a three-phase AC asynchronous motor 1 , and the hydraulic pump 2 provides rotational power by connecting to the three-phase AC asynchronous motor 1 .

[0029] The high-pressure P port of the hydraulic pump 2 is connected to a safety valve 22 .

[0030] Limit switch Ⅰ9 and limit switch Ⅱ10 adopt non-contact induction switches.

[0031] The conversion switch 8 is a two-way self-resetting switch.

[0032] The gear rotating structure 14 can rotate clockwise or counterclockwise.

[0033] Working process: During the construction of the pipe jacking machine, the head of the pipe jacking machine rotates and moves forward. At the same time, mud with a certain pressure is pumped into the slurry inlet pipe through the mud pump. The thixotropic mud sleeve is used to reduce the friction between the pipe wall and the soil during the jacking process, and fill the lost soil to reduce soil deformation, settlement and water isolation. Therefore, mud or water is pumped into the pipe, and then discharged into the mud pool through the pipe, and reused after sedimentation.

[0034] In actual work, mud must be pumped in first. At this time, the conversion switch 8 is in the middle gear, and the mud enters the main engine from the slurry inlet pipe and the stop valve B20. The stop valve C17 and the bypass valve 19 are in the closed state. The circulated mud enters the mud recovery system through the stop valve A18 and the slurry discharge pipe 15 to complete the internal circulation of the mud; if the upper end of the conversion switch 8 is pressed, the 3rd end of the conversion switch 8 is connected to the 1st end, the first solenoid valve 3 is energized, and the high-pressure oil of the hydraulic pump 2 flows through the first solenoid valve 3 and the two-way hydraulic lock to the rodless chamber of the first hydraulic cylinder 4 and the rod chamber of the second hydraulic cylinder 5. The rod of the first hydraulic cylinder 4 extends straight out, and the rod of the second hydraulic cylinder 5 retracts straight out. The inner sides of the first hydraulic cylinder 4 and the second hydraulic cylinder 5 are both geared, so the linear motion of the two cylinders drives the gear rotating structure 14 to rotate counterclockwise. After rotating a certain angle, the induction plate 13 meets the limit switch Ⅰ9, and the 1st and 2nd ends of the limit switch Ⅰ9 are connected. The coil of the relay Ⅰ12 is energized, and its normally closed contact is disconnected. The first solenoid valve 3 loses power, and the first hydraulic cylinder 4 and the second hydraulic cylinder 5 stop moving. At this time, the stop valve A18 and the stop valve C17 are both in the open state, and the bypass valve 19 and the stop valve B20 are both in the closed state. The newly mixed high-pressure mud flows into the working pit of the machine head through the stop valve C17, and the used mud flows into the working pit of the machine head through the stop valve C17. The check valve A18 and the pipeline flow back to the recovery pit, completing the external circulation of the mud for secondary utilization. During the working interval, the external circulation pipeline can also be used to flush the internal mud to prevent blockage. Since the mud is easy to solidify when it is still, when work is stopped or the project is completed, it is necessary to flush the mud pipeline with clean water in time. At this time, press the lower end of the conversion switch 8, and the 3rd and 7th ends of the conversion switch 8 are connected. The first solenoid valve 3 is energized, and the high-pressure oil of the hydraulic pump 2 flows through the second solenoid valve 6 and the two-way hydraulic lock to the rodless cavity of the second hydraulic cylinder 5 and the rod cavity of the first hydraulic cylinder 4. The rod of the first hydraulic cylinder 4 retracts linearly, and the rod of the second hydraulic cylinder 5 extends linearly. 4 and the inner side surfaces of the second hydraulic cylinder 5 are all teeth, so the linear motion of the two cylinders drives the gear rotating structure 14 to rotate clockwise. After rotating a certain angle, the induction plate 13 meets the limit switch Ⅱ10, and the 1 end and the 2 end of the limit switch Ⅱ10 are connected. The coil of the relay Ⅱ11 is energized, and its normally closed contact is disconnected. The second solenoid valve 6 loses power, and the first hydraulic cylinder 4 and the second hydraulic cylinder 5 stop moving. At this time, the stop valve A18, the stop valve B20 and the stop valve C17 are all in the closed state, and the bypass valve 19 is in the open state. Clean water flows out through the mud inlet, the bypass valve 19 and the recovered mud outlet to achieve the purpose of cleaning the mud pipeline.

[0035] As can be seen from the above structure, the present invention effectively ensures the reliability of slurry feeding and discharging when the pipe jacking machine is working through electrical control of mechanical and hydraulic systems, ensures the secondary utilization of mud, and achieves the purpose of energy saving and environmental protection.

[0036] The present invention also provides a pipe jacking machine having the above-mentioned mud control system.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A mud control system, characterized in that: It includes hydraulic control part, electrical control part and mechanical transmission part; The hydraulic control part comprises a hydraulic pump (2), a first solenoid valve (3), a second solenoid valve (6), a first hydraulic cylinder (4), and a second hydraulic cylinder (5); The hydraulic pump (2) is fixed on the AC motor (1); the P port of the hydraulic pump (2) is connected to the P1 ports of the first solenoid valve (3) and the second solenoid valve (6) through a pipeline; and the S port of the hydraulic pump (2) is connected to the hydraulic oil tank (7) through a pipeline; The T1 ports of the first solenoid valve (3) and the second solenoid valve (6) are connected to the hydraulic oil tank (7) through pipelines, the P2 port of the first solenoid valve (3) is connected to the rodless chamber of the first hydraulic cylinder (4) and the rod chamber of the second hydraulic cylinder (5), and the P3 port of the second solenoid valve (6) is connected to the rod chamber of the first hydraulic cylinder (4) and the rodless chamber of the second hydraulic cylinder (5); The electrical control part comprises a conversion switch (8), a limit switch I (9), a limit switch II (10), a relay I (12), and a relay II (11); Terminal 1 of the conversion switch (8) is connected to the positive electrode of the first solenoid valve (3) through the normally closed contact of the relay I (12), and terminal 7 of the conversion switch (8) is connected to the positive electrode of the second solenoid valve (6) through the normally closed contact of the relay II (11); The two ends of the limit switch I (9) are connected to the positive pole of the relay I (12) through the circuit, and the two ends of the limit switch II (10) are connected to the positive pole of the relay II (11) through the circuit; The mechanical transmission part comprises a gear rotating structure (14), a slurry discharge pipe (15), a slurry inlet pipe (16), a stop valve C (17), a stop valve A (18), a bypass valve (19), a stop valve B (20) and an induction plate (13); The first hydraulic cylinder (4) and the second hydraulic cylinder (5) are connected to the gear rotating structure (14); the stop valve C (17), the stop valve A (18), the bypass valve (19), and the stop valve B (20) are respectively installed in the mud pipeline; and the induction plate is installed on the upper end surface of the gear rotating structure (14); The bypass valve (19) is installed in a pipeline connecting the slurry discharge pipe (15) and the slurry inlet pipe (16), the stop valve A (18) and the stop valve B (20) are installed in the pipelines of the slurry discharge pipe (15) and the slurry inlet pipe (16), respectively, and the stop valve C (17) is installed in the external circulation pipeline; The hydraulic pump (2) provides rotational power by connecting to a three-phase AC asynchronous motor (1); The high-pressure P port of the hydraulic pump (2) is connected to a safety valve (22); A hydraulic lock (23) is installed between the first solenoid valve (3) and the second solenoid valve (6) and the first hydraulic cylinder (4) and the second hydraulic cylinder (5); The limit switch I (9) and limit switch II (10) are non-contact induction switches; The conversion switch (8) is a bidirectional self-resetting switch; The joint surfaces between the first hydraulic cylinder (4) and the second hydraulic cylinder (5) and the gear rotating structure (14) are processed into a rack structure and mesh with the gears of the gear rotating structure (14); The gear rotating structure (14) can rotate clockwise or counterclockwise.

2. A pipe jacking machine, characterized in that: A mud control system according to claim 1.

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