Hydraulic control system and control method for TBM stabilizer

Abstract

The invention discloses a TBM stabilizer hydraulic control system and method. The problem that in the prior art, a stabilizer hydraulic control system cannot maintain the stability of the supporting force of a stabilizer device under the variable load working condition is solved. The TBM stabilizer hydraulic control system comprises a left side stabilizer oil cylinder and a right side stabilizer oil cylinder which are connected with a valve block, and the valve block comprises an electromagnetic switch valve communicated with a P1 port of the valve block and a pressure reducing valve communicated with a P2 port of the valve block; the electromagnetic switch valve is connected with a proportional pressure reducing valve through an oil way, the proportional pressure reducing valve is connected with a rod cavity and a rodless cavity of the left side stabilizer oil cylinder through a first valve set, and the pressure reducing valve is connected with a rod cavity and a rodless cavity of the right side stabilizer oil cylinder through a second valve set. A first sequence valve is connected to the first valve set in parallel, and a second sequence valve is connected to the second valve set in parallel. The system is provided with a low-pressure large-flow loop and a high-pressure small-flow loop which are independent and adjustable, and the multi-stage pressure setting requirement of a stabilizer oil cylinder in the propelling and step changing process of a TBM is met; the supporting force range of the oil cylinder of the stabilizer can be limited according to actual working conditions, load changes caused by TBM surrounding rock disturbance and main machine vibration are adapted, and the tunneling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of TBM construction, and in particular to a hydraulic system for a TBM stabilizer. Background Art

[0002] Hard Rock Tunnel Boring Machine (TBM) has the advantages of high excavation efficiency, high safety factor, easy automation and environmental protection. It is currently widely used in the field of tunnel construction. The stabilizer device is an important component of the TBM host, providing stable support for the TBM host. During the excavation process of the TBM, the stabilizer device needs to support the tunnel wall with low pressure to reduce the vibration of the host; during the step change process, it needs to support the tunnel wall with high pressure to stabilize the host posture and avoid pulling back the cutterhead.

[0003] The stabilizer hydraulic control system needs to meet the two pressure switching of TBM equipment excavation and step-changing. Since TBM has the characteristics of large vibration and complex surrounding rock during the excavation process, the load on the stabilizer device is a variable load. The stabilizer hydraulic control system also needs to be able to maintain the stability of the stabilizer device's clamping force, but the current stabilizer hydraulic control system cannot meet the use requirements. For example, the utility model patent with application number 201621151424.9 discloses a pressure-adjustable stabilizer control valve group, which can only set the safety valve pressure according to the demand for the high-pressure clamping force of the stabilizer step-changing. During the excavation process of TBM equipment, the stabilizer device clamps the cave wall at low pressure, but the vibration of the main engine and other reasons will cause the pressure of the rodless chamber of the stabilizer cylinder to increase. When it does not reach the safety pressure, the stabilizer device will maintain a large clamping force, which will increase the excavation resistance. At the same time, the stabilizer device will bear a large radial force, which will reduce the service life of the stabilizer cylinder and affect the excavation efficiency and stability of the equipment. Therefore, it is necessary to provide a TBM stabilizer hydraulic control system. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a TBM stabilizer hydraulic control system and control method, which solves the problem in the prior art that the stabilizer hydraulic control system cannot maintain the stability of the stabilizer device's tightening force under variable load conditions.

[0005] The technical solution of the present invention is implemented as follows: a TBM stabilizer hydraulic control system includes a left stabilizer cylinder and a right stabilizer cylinder connected to a valve block, the valve block includes an electromagnetic switch valve connected to the P1 port of the valve block and a pressure reducing valve connected to the P2 port of the valve block; the electromagnetic switch valve is connected to a proportional pressure reducing valve through an oil circuit, the proportional pressure reducing valve is respectively connected to the rod chamber and the rodless chamber of the left stabilizer cylinder through a first valve group, and the pressure reducing valve is respectively connected to the rod chamber and the rodless chamber of the right stabilizer cylinder through a second valve group; a first sequence valve is connected in parallel to the first valve group, and a second sequence valve is connected in parallel to the second valve group.

[0006] Further preferably, the first valve group includes a first solenoid reversing valve, the P port of the first solenoid reversing valve is connected to the B port of the proportional pressure reducing valve through a first one-way valve; the A port of the first solenoid reversing valve is connected to the rodless chamber of the left stabilizer cylinder through a second one-way valve; the B port of the first solenoid reversing valve is connected to the rod chamber of the left stabilizer cylinder through a first balancing valve.

[0007] Further preferably, port A of the first sequence valve is connected to port B of the second one-way valve, port B of the first sequence valve is connected to port T1 of the valve block, and port C of the first sequence valve is connected to port A of the second one-way valve and port C of the first balancing valve.

[0008] Further preferably, the B port of the second one-way valve is connected to the MA1 port of the valve block, and the MA1 port of the valve block is provided with a first pressure sensor. The T port of the first electromagnetic reversing valve and the C port of the proportional pressure reducing valve are both connected to the T1 port of the valve block.

[0009] Further preferably, the second valve group includes a second solenoid reversing valve, the P port of the second solenoid reversing valve is connected to the B port of the pressure reducing valve through a third one-way valve; the A port of the second solenoid reversing valve is connected to the rodless chamber of the right stabilizer cylinder through a fourth one-way valve; and the B port of the second solenoid reversing valve is connected to the rod chamber of the right stabilizer cylinder through a second balancing valve.

[0010] Further preferably, port A of the second sequence valve is connected to port B of the fourth one-way valve, port B of the second sequence valve is connected to port T2 of the valve block, and port C of the second sequence valve is connected to port A of the fourth one-way valve and port C of the second balancing valve.

[0011] Further preferably, the B port of the fourth one-way valve is connected to the MA2 port of the valve block, and the MA2 port of the valve block is provided with a second pressure sensor; the T port of the second electromagnetic reversing valve is connected to the T2 port of the valve block.

[0012] Further preferably, the P1 port of the valve block is connected to a high-pressure oil source, and the P2 port of the valve block is connected to a low-pressure and high-flow oil source.

[0013] A control method of a TBM stabilizer hydraulic control system includes a TBM stabilizer oil cylinder low-pressure tightening mode and a TBM stabilizer oil cylinder high-pressure tightening mode.

[0014] When the TBM stabilizer cylinder is in low-pressure tightening mode, when the stabilizer cylinder needs to tighten the tunnel wall at low pressure during TBM excavation, the solenoid switch valve loses power and is in a closed state, the proportional pressure reducing valve signal is zero, and the first solenoid reversing valve and the second solenoid reversing valve are energized in parallel; the low-pressure and high-flow oil source flows into the A port of the pressure reducing valve through the P2 port of the valve block, and the hydraulic oil flows out from its B port after being regulated by the pressure reducing valve. The hydraulic oil flowing out of the B port of the pressure reducing valve flows into the B port of the third check valve through the A port of the third check valve, and the hydraulic oil flowing out of the B port of the third check valve flows into the P port of the first solenoid reversing valve and the P port of the second solenoid reversing valve respectively. The hydraulic oil flows out from the A port of the first solenoid reversing valve after passing through the A port of the first solenoid reversing valve, and the A port of the first solenoid reversing valve flows out The hydraulic oil flows to the second one-way valve, and at the same time, the hydraulic oil flowing out of the A port of the first solenoid reversing valve flows into the C port of the first balancing valve and the C port of the first sequence valve as the pilot oil, and the first balancing valve is opened; the hydraulic oil flowing out of the B port of the second one-way valve flows into the rodless chamber of the left stabilizer cylinder, and the left stabilizer cylinder extends; the hydraulic oil in the rod chamber of the left stabilizer cylinder flows into the B port of the first balancing valve, and the hydraulic oil flows out from the A port after passing through the first balancing valve, and the hydraulic oil flowing out of the A port of the first balancing valve flows into the first solenoid reversing valve through the B port of the first solenoid reversing valve, and the hydraulic oil flows out from the T port of the first solenoid reversing valve, and the hydraulic oil flowing out of the T port of the first solenoid reversing valve flows to the external oil tank through the T2 port of the valve block. The hydraulic oil flows out from the A port of the second solenoid reversing valve after passing through the second solenoid reversing valve, and the hydraulic oil flowing out from the A port of the second solenoid reversing valve flows forward into the fourth one-way valve through the A port of the fourth one-way valve, and the hydraulic oil flows out from the B port of the fourth one-way valve after passing through the fourth one-way valve. At the same time, the hydraulic oil flowing out from the A port of the second solenoid reversing valve flows into the C port of the second balancing valve and the C port of the second sequence valve as the pilot oil. The second balancing valve is opened, and the hydraulic oil flowing out from the B port of the fourth one-way valve flows into the rodless chamber of the right stabilizer cylinder, and the right stabilizer cylinder extends; the hydraulic oil in the rod chamber of the right stabilizer cylinder flows into the B port of the second balancing valve through its B port, and the hydraulic oil flows out from the A port of the second balancing valve after passing through the second balancing valve. The hydraulic oil flowing out from the A port of the second balancing valve flows into the second solenoid reversing valve through the B port of the second solenoid reversing valve, and the hydraulic oil flows out from the T port of the second solenoid reversing valve after passing through the second solenoid reversing valve. The hydraulic oil flowing out from the T port of the second solenoid reversing valve goes to the external oil tank through the T2 port of the valve block. The first pressure sensor detects the rodless chamber pressure of the left stabilizer cylinder, and the second pressure sensor detects the rodless chamber pressure of the right stabilizer cylinder. After the left stabilizer cylinder and the right stabilizer cylinder extend and touch the hole wall, low-pressure tightening is achieved. At the same time, the pilot oil pressure of the C port of the first sequence valve is compared with the load pressure of its A port. When the difference is greater than the spring setting value of the first sequence valve, the hydraulic oil overflows from the B port of the first sequence valve to the T1 port of the valve block. Similarly, the pilot oil pressure of the C port of the second sequence valve is compared with the load pressure of its A port. When the difference between the two is greater than the spring setting value of the second sequence valve, the oil overflows from the B port of the second sequence valve to the T2 port of the valve block to maintain the low-pressure stability of the tightening force of the left stabilizer cylinder and the right stabilizer cylinder.

[0015] When the TBM stabilizer cylinder is in high-pressure tightening mode: when the stabilizer cylinder needs to tighten the cave wall with high pressure during the step-changing process of the TBM, the left stabilizer cylinder and the right stabilizer cylinder are first extended quickly and at low pressure through the low-pressure tightening mode of the TBM stabilizer cylinder mentioned above, and then the high-pressure tightening is switched according to the pressure values ​​detected by the first pressure sensor and the second pressure sensor; at this time, the solenoid switch valve is energized, and the proportional pressure reducing valve is energized according to the given signal value of the working condition, and the first solenoid reversing valve and the second solenoid reversing valve keep the parallel position; the high-pressure oil source flows into the A port of the solenoid switch valve through the P1 port of the valve block, and the high-pressure hydraulic oil flows out from the B port of the solenoid switch valve after passing through the solenoid switch valve, and the hydraulic oil flowing out of the B port of the solenoid switch valve flows into the A port of the proportional pressure reducing valve, and the high-pressure hydraulic oil flows out from the B port of the proportional pressure reducing valve after being adjusted by the proportional pressure reducing valve, and the high-pressure hydraulic oil flowing out of the B port of the proportional pressure reducing valve flows into the A port of the first check valve, and the hydraulic The pressurized oil flows out from the B port after passing through the first one-way valve. The hydraulic oil flowing out of the B port of the first one-way valve flows into the P port of the first solenoid reversing valve and the P port of the second solenoid reversing valve respectively. Then, the above-mentioned low-pressure tightening mode of the TBM stabilizer cylinder is operated, and the high-pressure hydraulic oil enters the large chamber of the left stabilizer cylinder and the right stabilizer cylinder to tighten the hole wall with high pressure. At the same time, the pilot oil pressure of the C port of the first sequence valve is compared with the load pressure of its A port. When the difference is greater than the spring setting value of the first sequence valve, the hydraulic oil overflows from the B port to the T1 port of the valve block. Similarly, the pilot oil pressure of the C port of the second sequence valve is compared with the load pressure of its A port. When the difference between the two is greater than the spring setting value of the second sequence valve, the hydraulic oil overflows from the B port of the second sequence valve to the T2 port of the valve block to maintain the high-pressure stability of the tightening force of the left stabilizer cylinder and the right stabilizer cylinder during TBM construction.

[0016] The beneficial effects of the present invention are as follows: the present invention can provide two independently adjustable low-pressure, high-flow and high-pressure, low-flow oil sources through the joint control of the proportional pressure reducing valve, the pressure reducing valve and the electromagnetic reversing valve, realize the low-pressure and high-pressure tightening of the stabilizer cylinder, and realize the multi-stage pressure setting requirements of the stabilizer cylinder during the advancement and step-changing process of the TBM equipment. The present invention can adjust the set pressure of the sequence valve according to the actual working conditions, limit the difference between the load force and the tightening force of the stabilizer cylinder, adapt to the load changes of the stabilizer device caused by the vibration of the TBM main engine and the surrounding rock disturbance, maintain the stability of the tightening force of the stabilizer cylinder, and avoid the risk of the stabilizer cylinder being subjected to excessive radial force during the excavation process following the main engine, thereby improving the excavation efficiency of the equipment and the stability of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0018] Figure 1It is a schematic diagram of the hydraulic system of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, embodiment 1, a TBM stabilizer hydraulic control system, includes a left stabilizer cylinder 16 and a right stabilizer cylinder 17 connected to a valve block 18, the valve block 18 includes an electromagnetic switch valve 1 connected to the P1 port of the valve block 18 and a pressure reducing valve 4 connected to the P2 port of the valve block 18; the P1 port of the valve block 18 is connected to a high-pressure oil source, and the P2 port of the valve block 18 is connected to a low-pressure and high-flow oil source. The electromagnetic switch valve 1 is connected to a proportional pressure reducing valve 2 through an oil circuit, and the proportional pressure reducing valve 2 is respectively connected to the rod chamber and the rodless chamber of the left stabilizer cylinder 16 through a first valve group, and the pressure reducing valve 4 is respectively connected to the rod chamber and the rodless chamber of the right stabilizer cylinder 17 through a second valve group; the first valve group is connected in parallel with a first sequence valve 10, and the second valve group is connected in parallel with a second sequence valve 13. The sequence valve is connected to the rodless chamber of the corresponding stabilizer cylinder, and the upper limit value of the tightening force of the stabilizer cylinder can be adjusted. The proportional pressure reducing valve is used to adjust the pressure of the high-pressure oil source; the pressure reducing valve can adjust the pressure of the low-pressure oil source. The above hydraulic system has two independently adjustable low-pressure high-flow and high-pressure low-flow circuits to meet the multi-level pressure setting requirements of the stabilizer cylinder during the advancement and step-changing process of the TBM equipment, thereby improving the excavation efficiency. The hydraulic control system can follow the multi-level pressure setting to limit the tightening force of the stabilizer cylinder, adapt to the load changes of the stabilizer device caused by the vibration of the TBM main engine and the surrounding rock disturbance, maintain the stability of its tightening force, and avoid the risk of a sharp increase in its radial force.

[0021] As an implementation mode, the first valve group in this embodiment includes a first electromagnetic reversing valve 6, and the first electromagnetic reversing valve, the power-on sequence of which determines the action direction of the left stabilizer cylinder. The P port of the first electromagnetic reversing valve 6 is connected to the B port of the proportional pressure reducing valve 2 through the first check valve 3; the A port of the first electromagnetic reversing valve 6 is connected to the rodless cavity of the left stabilizer cylinder 16 through the second check valve 9; the B port of the first electromagnetic reversing valve 6 is connected to the rod cavity of the left stabilizer cylinder 16 through the first balancing valve 8. The balancing valve is connected to the rod cavity of the stabilizer cylinder.

[0022] Similarly, as an implementation mode, the second valve group in this embodiment includes a second electromagnetic reversing valve 7, and the power-on sequence of the second electromagnetic reversing valve determines the action direction of the right stabilizer cylinder. The P port of the second electromagnetic reversing valve 7 is connected to the B port of the pressure reducing valve 4 through the third one-way valve 5; the A port of the second electromagnetic reversing valve 7 is connected to the rodless cavity of the right stabilizer cylinder 17 through the fourth one-way valve 12; the B port of the second electromagnetic reversing valve 7 is connected to the rod cavity of the right stabilizer cylinder 17 through the second balancing valve 11.

[0023] As mentioned above, through the joint control of the proportional pressure reducing valve, the pressure reducing valve and the electromagnetic reversing valve, two independently adjustable low-pressure and high-flow oil sources and high-pressure and low-flow oil sources can be provided to achieve low-pressure and high-pressure tightening of the stabilizer cylinder, and meet the multi-stage pressure setting requirements of the stabilizer cylinder during the advancement and step-changing process of the TBM equipment; at the same time, the sequence valve setting pressure, that is, the difference between the load force and the tightening force of the stabilizer cylinder, can be adjusted according to the actual working conditions, which can not only limit the safety pressure of the rodless cavity of the stabilizer cylinder of the TBM equipment during the step-changing process, but also adapt to the load changes of the stabilizer device caused by the vibration of the main engine and the surrounding rock disturbance during the excavation process, maintain the stability of the tightening force of the stabilizer cylinder, and reduce the risk of the stabilizer cylinder being subjected to excessive radial force during the excavation process following the main engine; the pressure and flow of the rod cavity of the stabilizer cylinder are controlled by the balance valve, and the automatic extension of the stabilizer cylinder caused by the vibration of the main engine can be avoided under no load or low load, thereby improving the excavation efficiency and operation stability of the equipment.

[0024] Embodiment 2, a TBM stabilizer hydraulic control system, based on embodiment 1, this embodiment is further optimized. In this embodiment, port A of the first sequence valve 10 is connected to port B of the second one-way valve 9, port B of the first sequence valve 10 is connected to port T1 of the valve block 18, and port C of the first sequence valve 10 is connected to port A of the second one-way valve 9 and port C of the first balancing valve 8.

[0025] Among them, the B port of the second one-way valve 9 is connected to the MA1 port of the valve block 18, and the first pressure sensor 14 is provided on the MA1 port of the valve block 18. The valve block 18 includes two MA1 ports, namely MA11 and MA12, and the first pressure sensor 14 is arranged at MA12. The first pressure sensor 14 is connected to the rodless chamber of the left stabilizer cylinder to detect the pressure at the corresponding position. The T port of the first electromagnetic reversing valve 6 and the C port of the proportional pressure reducing valve 2 are both connected to the T1 port of the valve block 18.

[0026] As an implementation manner, port A of the second sequence valve 13 is connected to port B of the fourth one-way valve 12, port B of the second sequence valve 13 is connected to port T2 of the valve block 18, and port C of the second sequence valve 13 is connected to port A of the fourth one-way valve 12 and port C of the second balancing valve 11.

[0027] Among them, the B port of the fourth one-way valve 12 is connected to the MA2 port of the valve block 18, and the second pressure sensor 15 is provided on the MA2 port of the valve block 18. The MA2 port of the valve block 18 has two ports, MA21 and MA22, respectively. The second pressure sensor 15 is connected to MA22, which is connected to the rodless chamber of the right stabilizer cylinder to detect the pressure at the corresponding position. The T port of the second electromagnetic reversing valve 7 is connected to the T2 port of the valve block 18.

[0028] For the convenience of distinction and description, the A / B port of the electromagnetic switch valve 1 is defined as 1A / 1B; the A / B / C port of the proportional pressure reducing valve 2 is 2A / 2B / 2C, the A / B port of the first check valve 3 is 3A / 3B; the A / B port of the pressure reducing valve 4 is 4A / 4B; the A / B port of the third check valve 5 is 5A / 5B; the A / B / T / P port of the first electromagnetic reversing valve 6 is 6A / 6B / 6T / 6P; the A / B / T / P port of the second electromagnetic reversing valve 7 is 7A / 7B / 7T / 7P, the A / B / C port of the first balancing valve 8 is 8A / 8B / 8C, and the A / Port B is 9A / 9B, port A / B / C of the first sequence valve 10 is 10A / 10B / 10C, ​​port A / B / C of the second balancing valve 11 is 11A / 11B / 11C, port A / B of the fourth check valve 12 is 12A / 12B, port A / B / C of the second sequence valve 13 is 13A / 13B / 13C, the left stabilizer cylinder 16 has a rod chamber oil port 16B and a rodless chamber oil port 16A, the right stabilizer cylinder 17 has a rod chamber oil port 17B and a rodless chamber oil port 17A.

[0029] The P1 port of the valve block 18 is connected to an external high-pressure oil source, and the P2 port is connected to an external low-pressure and high-flow oil source; the P1 port of the valve block 18 is connected to the 1A port of the electromagnetic switch valve 1; the 1B port of the electromagnetic switch valve 1 is connected to the 2A port of the proportional pressure reducing valve 2; the 2B port of the proportional pressure reducing valve 2 is connected to the 3A port of the first check valve 3; the 2C port of the proportional pressure reducing valve 2 is connected to the T1 port of the valve block 18; the 3B port of the first check valve 3 is respectively connected to the 6P port of the first electromagnetic reversing valve 6 and the 7P port of the second electromagnetic reversing valve 7. P2 of the valve block 18 is connected to the 4A port of the pressure reducing valve 4; the 4B port of the pressure reducing valve 4 is connected to the 5A port of the third check valve 5; the 5B port of the third check valve 5 is respectively connected to the 7P port of the second electromagnetic reversing valve 7 and the 6P port of the first electromagnetic reversing valve 6; the 6A port of the electromagnetic reversing valve 6 is respectively connected to the 9A port of the second check valve 9, the 10C port of the first sequence valve 10, and the 8C port of the first balancing valve 8; the 9B port of the second check valve 9 is respectively connected to the 10A port, The A1 port of the valve block 18, the MA11 pressure measuring port and the MA12 pressure measuring port of the valve block 18 are connected; the A1 port of the valve block 18 is connected to the rodless chamber 16A port of the left stabilizer cylinder 16; the 6B port of the first solenoid reversing valve 6 is connected to the 8A port of the first balancing valve 8; the 8B port of the first balancing valve 8 is respectively connected to the B1 port and the MB1 pressure measuring port of the valve block 18, and the rod chamber 16B port of the left stabilizer cylinder 16; the first pressure sensor 14 is connected to the MA12 port of the valve block 18. The 7A port of the second electromagnetic reversing valve 7 is respectively connected to the 12A port of the fourth check valve 12, the 13C port of the second sequence valve 13, and the 11C port of the second balance valve 11; the 12B port of the fourth check valve 12 is respectively connected to the 13A port of the sequence valve 13, the A2 port of the valve block 18, the MA21 pressure measuring port and the MA22 pressure measuring port of the valve block 18; the A2 port of the valve block 18 is connected to the 17A port of the rodless chamber of the right stabilizer cylinder 17; the 7B port of the second electromagnetic reversing valve 7 is respectively connected to the 13A port of the sequence valve 13, the A2 port of the valve block 18, and the MA21 pressure measuring port and the MA22 pressure measuring port of the valve block 18; the A2 port of the valve block 18 is connected to the 17A port of the rodless chamber of the right stabilizer cylinder 17; The port is connected to the 11A port of the second balancing valve 11; the 11B port of the second balancing valve 11 is respectively connected to the B2 port and MB2 pressure measuring port of the valve block 18 and the 17B port of the rod chamber of the right stabilizer cylinder 17; the second pressure sensor 15 is connected to the MA22 port of the valve block 18; the T2 port of the valve block 18 is respectively connected to the 6T port of the first solenoid reversing valve 6, the 7T port of the second solenoid reversing valve 7, the 10B port of the first sequence valve 10, and the 13B port of the second sequence valve 13.

[0030] Embodiment 3, a control method of a TBM stabilizer hydraulic control system as described in Embodiment 1 or 2, comprises a TBM stabilizer cylinder low-pressure tightening mode and a TBM stabilizer cylinder high-pressure tightening mode.

[0031] When the TBM stabilizer cylinder is in low-pressure tightening mode, when the stabilizer cylinder is required to tighten the tunnel wall at low pressure during TBM excavation, the electromagnetic switch valve 1 loses power and is in a closed state, the signal of the proportional pressure reducing valve 2 is zero, and the first electromagnetic reversing valve 6 and the second electromagnetic reversing valve 7 are energized in parallel; the low-pressure and large-flow oil source flows into the A port of the pressure reducing valve 4 through the P2 port of the valve block 18, and the hydraulic oil flows out from its B port after being regulated by the pressure reducing valve 4. The hydraulic oil flowing out of the B port of the pressure reducing valve 4 flows into the B port of the third check valve 5 through the A port of the third check valve 5, and the hydraulic oil flowing out of the B port of the third check valve 5 flows into the P port of the first electromagnetic reversing valve 6 and the P port of the second electromagnetic reversing valve 7 respectively. The hydraulic oil flows out from the A port of the first electromagnetic reversing valve 6 after passing through the A port of the first electromagnetic reversing valve 6. The hydraulic oil flowing out of the A port of the first electromagnetic reversing valve 6 The oil flows to the second one-way valve 9, and at the same time, the hydraulic oil flowing out of the A port of the first solenoid reversing valve 6 flows into the C port of the first balancing valve 8 and the C port of the first sequence valve 10 as the pilot oil, and the first balancing valve 8 is opened; the hydraulic oil flowing out of the B port of the second one-way valve 9 flows into the rodless chamber of the left stabilizer cylinder 16, and the left stabilizer cylinder 16 extends; the hydraulic oil in the rod chamber of the left stabilizer cylinder 16 flows into the B port of the first balancing valve 8, and the hydraulic oil flows out from the A port after passing through the first balancing valve 8, and the hydraulic oil flowing out of the A port of the first balancing valve 8 flows into the first solenoid reversing valve 6 through the B port of the first solenoid reversing valve 6, and the hydraulic oil flows out from the T port of the first solenoid reversing valve 6, and the hydraulic oil flowing out of the T port of the first solenoid reversing valve 6 flows to the external oil tank through the T2 port of the valve block 18. The hydraulic oil flows out from the A port of the second solenoid reversing valve 7 after passing through the A port of the second solenoid reversing valve 7, and flows into the fourth one-way valve 12 through the A port of the fourth one-way valve 12. The hydraulic oil flows out from the B port of the fourth one-way valve 12 after passing through the B port of the fourth one-way valve 12. At the same time, the hydraulic oil flowing out from the A port of the second solenoid reversing valve 7 flows into the C port of the second balancing valve 11 and the C port of the second sequence valve 13 as the pilot oil. The second balancing valve 11 is opened, and the hydraulic oil flowing out from the B port of the fourth one-way valve 12 flows into the right stabilizer cylinder 1 7, the right stabilizer cylinder 17 extends out; the hydraulic oil in the rod chamber of the right stabilizer cylinder 17 flows into the B port of the second balancing valve 11 through its B port, and the hydraulic oil flows out from its A port after passing through the second balancing valve 11. The hydraulic oil flowing out of the A port of the second balancing valve 11 flows into the second solenoid reversing valve 7 through the B port of the second solenoid reversing valve 7, and the hydraulic oil flows out from the T port of the second solenoid reversing valve 7. The hydraulic oil flowing out of the T port of the second solenoid reversing valve 7 goes to the external oil tank through the T2 port of the valve block 18.The first pressure sensor 14 detects the rodless chamber pressure of the left stabilizer cylinder 16, and the second pressure sensor 15 detects the rodless chamber pressure of the right stabilizer cylinder 17. After the left stabilizer cylinder 16 and the right stabilizer cylinder 17 extend to contact the hole wall, low-pressure tightening is achieved. At the same time, the pilot oil pressure of the C port of the first sequence valve 10 is compared with the load pressure of its A port. When the difference is greater than the spring setting value of the first sequence valve 10, the hydraulic oil overflows from the B port of the first sequence valve to the T1 port of the valve block 18. Similarly, the pilot oil pressure of the C port of the second sequence valve and The load pressures at the A ports are compared. When the difference between the two is greater than the spring setting value of the second sequence valve 13, oil overflows from the B port of the second sequence valve 13 to the T2 port of the valve block 18 to maintain the low-pressure stability of the clamping force of the left stabilizer cylinder 16 and the right stabilizer cylinder 17. This can avoid the increase in excavation resistance when the load force of the stabilizer device is too large due to the vibration of the main engine and the surrounding rock disturbance, thereby improving the excavation efficiency and operation stability of the TBM equipment, and also avoid the risk of the left stabilizer cylinder 16 and the right stabilizer cylinder 17 being subjected to large radial forces during the excavation process following the main engine.

[0032] When the TBM stabilizer cylinder is in high-pressure tightening mode: when the stabilizer cylinder needs to tighten the cave wall with high pressure during the TBM step-changing process, the left stabilizer cylinder 16 and the right stabilizer cylinder 17 are first extended quickly and at low pressure through the low-pressure tightening mode of the TBM stabilizer cylinder, and then the high-pressure tightening is switched according to the pressure values ​​detected by the first pressure sensor 14 and the second pressure sensor 15; at this time, the electromagnetic switch valve 1 is energized, and the proportional pressure reducing valve 2 is energized according to the given signal value of the working condition, and the first electromagnetic reversing valve 6 and the second electromagnetic reversing valve 7 are kept in parallel position; the high-pressure oil source flows into the A port of the electromagnetic switch valve 1 through the P1 port of the valve block 18, and the high-pressure hydraulic oil flows out from the B port of the electromagnetic switch valve 1 after passing through the electromagnetic switch valve 1, and the hydraulic oil flowing out of the B port of the electromagnetic switch valve 1 flows into the A port of the proportional pressure reducing valve 2, and the high-pressure hydraulic oil flows out from the B port of the proportional pressure reducing valve 2 after being adjusted. The high-pressure hydraulic oil flowing out of the B port of the proportional pressure reducing valve 2 flows into the A port of the first check valve 3, and the hydraulic oil flows out from the B port of the first check valve 3 after passing through the first check valve 3. The liquid flowing out of the B port of the first check valve 3 The pressurized oil flows into the P port of the first electromagnetic reversing valve 6 and the P port of the second electromagnetic reversing valve 7 respectively, and then the above-mentioned TBM stabilizer cylinder low-pressure tightening mode operation is performed, and the high-pressure hydraulic oil enters the large chamber of the left stabilizer cylinder 16 and the right stabilizer cylinder 17, and the hole wall is tightened with high pressure; at the same time, the pilot oil pressure of the C port of the first sequence valve 10 is compared with its A port load pressure. When the difference is greater than the spring setting value of the first sequence valve 10, the hydraulic oil overflows from the B port to the T1 port of the valve block 18. Similarly, the pilot oil pressure of the C port of the second sequence valve 13 is compared with its A port load pressure. When the difference between the two is greater than the spring setting value of the second sequence valve 13, the hydraulic oil overflows from the B port of the second sequence valve 13 to the T2 port of the valve block 18 to maintain the high-pressure stability of the tightening force of the left stabilizer cylinder 16 and the right stabilizer cylinder 17 during the TBM construction process; the safety pressure value of the rodless chamber of the left stabilizer cylinder 16 and the right stabilizer cylinder 17 during the step-changing process of the TBM equipment can also be limited to protect the stabilizer device.

[0033] As shown above, the TBM stabilizer hydraulic control system of the present invention is suitable for the stabilizer device in the main engine of TBM or shield machine, and is mainly composed of electromagnetic switch valve, proportional pressure reducing valve, one-way valve, electromagnetic reversing valve, pressure reducing valve, balancing valve and sequence valve. The system realizes low-pressure and high-pressure tightening of the stabilizer cylinder through the joint control of proportional pressure reducing valve, pressure reducing valve and electromagnetic reversing valve, and adapts to the requirements of multi-level pressure in the process of TBM excavation; the set pressure of the sequence valve can be adjusted according to the actual working conditions to maintain the stability of the tightening force of the stabilizer cylinder and adapt to the load force changes caused by the changes in the surrounding rock and the vibration of the main engine. Any application field of the hydraulic control system that is the same as that of the present hydraulic control system and has some structures and functions of the present hydraulic control system should be included in the protection scope of the present invention.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A TBM stabilizer hydraulic control system, comprising a left stabilizer cylinder (16) and a right stabilizer cylinder (17) connected to a valve block (18), characterized in that: The valve block (18) comprises an electromagnetic switch valve (1) connected to the P1 port of the valve block (18) and a pressure reducing valve (4) connected to the P2 port of the valve block (18); the electromagnetic switch valve (1) is connected to a proportional pressure reducing valve (2) via an oil circuit; the proportional pressure reducing valve (2) is respectively connected to a rod chamber and a rodless chamber of a left stabilizer oil cylinder (16) via a first valve group; the pressure reducing valve (4) is respectively connected to a rod chamber and a rodless chamber of a right stabilizer oil cylinder (17) via a second valve group; a first sequence valve (10) is connected in parallel to the first valve group, and a second sequence valve (13) is connected in parallel to the second valve group.

2. The TBM stabilizer hydraulic control system according to claim 1, characterized in that: The first valve group comprises a first electromagnetic reversing valve (6), wherein the P port of the first electromagnetic reversing valve (6) is connected to the B port of the proportional pressure reducing valve (2) via a first non-return valve (3); the A port of the first electromagnetic reversing valve (6) is connected to the rodless chamber of the left stabilizer oil cylinder (16) via a second non-return valve (9); and the B port of the first electromagnetic reversing valve (6) is connected to the rod chamber of the left stabilizer oil cylinder (16) via a first balancing valve (8).

3. The TBM stabilizer hydraulic control system according to claim 2, characterized in that: The A port of the first sequence valve (10) is connected to the B port of the second one-way valve (9), the B port of the first sequence valve (10) is connected to the T1 port of the valve block (18), and the C port of the first sequence valve (10) is connected to the A port of the second one-way valve (9) and the C port of the first balancing valve (8).

4. The TBM stabilizer hydraulic control system according to claim 3, characterized in that: The B port of the second one-way valve (9) is connected to the MA1 port of the valve block (18), and the MA1 port of the valve block (18) is provided with a first pressure sensor (14).

5. The TBM stabilizer hydraulic control system according to any one of claims 2 to 4, characterized in that: The T port of the first electromagnetic reversing valve (6) and the C port of the proportional pressure reducing valve (2) are both connected to the T1 port of the valve block (18).

6. The TBM stabilizer hydraulic control system according to claim 1, characterized in that: The second valve group comprises a second electromagnetic reversing valve (7), wherein the P port of the second electromagnetic reversing valve (7) is connected to the B port of the pressure reducing valve (4) via a third one-way valve (5); the A port of the second electromagnetic reversing valve (7) is connected to the rodless chamber of the right stabilizer oil cylinder (17) via a fourth one-way valve (12); and the B port of the second electromagnetic reversing valve (7) is connected to the rod chamber of the right stabilizer oil cylinder (17) via a second balancing valve (11).

7. The TBM stabilizer hydraulic control system according to claim 5, characterized in that: The A port of the second sequence valve (13) is connected to the B port of the fourth one-way valve (12), the B port of the second sequence valve (13) is connected to the T2 port of the valve block (18), and the C port of the second sequence valve (13) is connected to the A port of the fourth one-way valve (12) and the C port of the second balancing valve (11).

8. The TBM stabilizer hydraulic control system according to claim 7, characterized in that: The B port of the fourth one-way valve (12) is connected to the MA2 port of the valve block (18), and the MA2 port of the valve block (18) is provided with a second pressure sensor (15); the T port of the second electromagnetic reversing valve (7) is connected to the T2 port of the valve block (18).

9. The TBM stabilizer hydraulic control system according to any one of claims 1, 4, 6 to 8, characterized in that: The P1 port of the valve block (18) is connected to a high-pressure oil source, and the P2 port of the valve block (18) is connected to a low-pressure, high-flow oil source.

10. A control method for a TBM stabilizer hydraulic control system according to claim 9, characterized in that: Including TBM stabilizer cylinder low pressure tightening mode and TBM stabilizer cylinder high pressure tightening mode, When the TBM stabilizer cylinder is in low-pressure tightening mode and the stabilizer cylinder is required to tighten the tunnel wall at low pressure during the TBM excavation process, the electromagnetic switch valve (1) loses power and is in a closed state, the signal of the proportional pressure reducing valve (2) is zero, and the first electromagnetic reversing valve (6) and the second electromagnetic reversing valve (7) are energized in parallel; the low-pressure and high-flow oil source flows into the A port of the pressure reducing valve (4) through the P2 port of the valve block (18), and the hydraulic oil flows out from the B port of the pressure reducing valve (4) after being regulated by the pressure reducing valve (4). The hydraulic oil flowing out of the B port of the pressure reducing valve (4) flows into the B port of the third check valve (5) through the A port of the third check valve (5), and the hydraulic oil flowing out of the B port of the third check valve (5) flows into the P port of the first electromagnetic reversing valve (6) and the P port of the second electromagnetic reversing valve (7) respectively. The hydraulic oil flows out from the A port of the first electromagnetic reversing valve (6) after passing through the A port of the first electromagnetic reversing valve (6). The hydraulic oil flowing out of the A port of the first electromagnetic reversing valve (6) flows out. to the second one-way valve (9), and at the same time, the hydraulic oil flowing out of the A port of the first solenoid reversing valve (6) flows into the C port of the first balancing valve (8) and the C port of the first sequence valve (10) as the pilot oil, and the first balancing valve (8) is opened; the hydraulic oil flowing out of the B port of the second one-way valve (9) flows into the rodless chamber of the left stabilizer cylinder (16), and the left stabilizer cylinder (16) extends; the hydraulic oil in the rod chamber of the left stabilizer cylinder (16) flows into the B port of the first balancing valve (8), and the hydraulic oil flows out from the A port of the first balancing valve (8) through the B port of the first solenoid reversing valve (6), and the hydraulic oil flows out from the T port of the first solenoid reversing valve (6), and the hydraulic oil flows out from the T port of the first solenoid reversing valve (6) through the T2 port of the valve block (18) to the external oil tank; The hydraulic oil flows out from the A port of the second solenoid reversing valve (7) after passing through the A port of the second solenoid reversing valve (7). The hydraulic oil flows out from the A port of the second solenoid reversing valve (7) through the A port of the fourth check valve (12) and flows out from the B port of the fourth check valve (12). At the same time, the hydraulic oil flows out from the A port of the second solenoid reversing valve (7) as the pilot oil and flows into the C port of the second balancing valve (11) and the C port of the second sequence valve (13). The second balancing valve (11) is opened, and the hydraulic oil flows out from the B port of the fourth check valve (12) and flows into the right stabilizer cylinder (1 7), the right stabilizer oil cylinder (17) extends; the hydraulic oil in the rod chamber of the right stabilizer oil cylinder (17) flows into the B port of the second balancing valve (11) through its B port, the hydraulic oil flows out from the A port of the second balancing valve (11) after passing through the second balancing valve (11), the hydraulic oil flowing out of the A port of the second balancing valve (11) flows into the second solenoid reversing valve (7) through the B port of the second solenoid reversing valve (7), the hydraulic oil flows out from the T port of the second solenoid reversing valve (7), the hydraulic oil flows out from the T port of the second solenoid reversing valve (7) through the T2 port of the valve block (18) to the external oil tank; The first pressure sensor (14) detects the rodless chamber pressure of the left stabilizer oil cylinder (16), and the second pressure sensor (15) detects the rodless chamber pressure of the right stabilizer oil cylinder (17). After the left stabilizer oil cylinder (16) and the right stabilizer oil cylinder (17) extend and contact the hole wall, low-pressure tightening is achieved. At the same time, the pilot oil pressure of the C port of the first sequence valve (10) and the load pressure of its A port are compared. When the difference is greater than the spring setting value of the first sequence valve (10), the hydraulic oil overflows from the B port of the first sequence valve (10) to the T1 port of the valve block (18). Similarly, the pilot oil pressure of the C port of the second sequence valve (13) and the load pressure of its A port are compared. When the difference between the two is greater than the spring setting value of the second sequence valve (13), the hydraulic oil overflows from the B port of the second sequence valve (13) to the T2 port of the valve block (18), thereby maintaining the low-pressure stability of the tightening force of the left stabilizer oil cylinder (16) and the right stabilizer oil cylinder (17); When the TBM stabilizer cylinder is in high-pressure tightening mode: when the stabilizer cylinder is required to tighten the tunnel wall with high pressure during the step-changing process of the TBM, the left stabilizer cylinder (16) and the right stabilizer cylinder (17) are first extended quickly and at low pressure through the low-pressure tightening mode of the TBM stabilizer cylinder, and then the high-pressure tightening is switched according to the pressure values ​​detected by the first pressure sensor (14) and the second pressure sensor (15); at this time, the solenoid switch valve (1) is energized, and the proportional pressure reducing valve (2) is energized according to the given signal value of the working condition, and the first solenoid switch valve (1) is energized. The solenoid reversing valve (6) and the second solenoid reversing valve (7) are kept in parallel position and energized; the external high-pressure oil source flows into the A port of the solenoid switch valve (1) through the P1 port of the valve block (18); the high-pressure hydraulic oil flows out from the B port of the solenoid switch valve (1); the hydraulic oil flowing out of the B port of the solenoid switch valve (1) flows into the A port of the proportional pressure reducing valve (2); the high-pressure hydraulic oil flows out from the B port of the proportional pressure reducing valve (2) after being adjusted; the high-pressure hydraulic oil flows out from the B port of the proportional pressure reducing valve (2) into the A port of the first check valve (3); the hydraulic oil The pressurized oil flows out from the B port of the first check valve (3). The hydraulic oil flowing out from the B port of the first check valve (3) flows into the P port of the first electromagnetic reversing valve (6) and the P port of the second electromagnetic reversing valve (7) respectively. Then, the TBM stabilizer cylinder low-pressure tightening mode operation is performed. The high-pressure hydraulic oil enters the large chamber of the left stabilizer cylinder (16) and the right stabilizer cylinder (17), and the high-pressure tightening of the hole wall is performed. At the same time, the pilot oil pressure of the C port of the first sequence valve (10) is compared with the load pressure of its A port. When the difference When the value is greater than the spring setting value of the first sequence valve (10), the hydraulic oil overflows from port B to port T1 of the valve block (18). Similarly, the pilot oil pressure at port C of the second sequence valve (13) is compared with the load pressure at port A. When the difference between the two is greater than the spring setting value of the second sequence valve (13), the hydraulic oil overflows from port B of the second sequence valve (13) to port T2 of the valve block (18), thereby maintaining the high pressure stability of the tensioning force of the left stabilizer cylinder (16) and the right stabilizer cylinder (17) during TBM construction.

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