Anti-stuck residue breaking system for super-large-diameter slurry balance shield

Abstract

The application belongs to the technical field of slurry balance shield, and particularly relates to a slag-stopping and breaking system for a super-large-diameter slurry balance shield, which comprises a shell, a jaw plate, a rotary grinding head, a hydraulic cylinder, a hydraulic motor and a hydraulic system, the hydraulic cylinder is fixed in the shell and connected with the jaw plate, a plurality of hydraulic motors are arranged on one end surface of the jaw plate, a plurality of tooth-shaped structures and the rotary grinding head are arranged on the other end surface of the jaw plate; the breaker adopts a frame structure, and is more uniform in stress; the rotary grinding head enhances the breaking effect; the hydraulic system adopts a hydraulic station and a pressure-increasing cylinder for pressure increasing, and the rock breaking capacity of the breaker under extreme working conditions is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of slurry balance shield, and particularly relates to a slag accumulation prevention crushing system for super-large-diameter slurry balance shield. BACKGROUND

[0002] In the process of tunnel construction of a super-large-diameter slurry balance shield, the slurry circulation system is prone to be blocked and the slurry is prone to be accumulated, which restricts the efficiency and safety of tunnel construction. The traditional crushing system in the slurry balance shield chamber has problems such as poor mechanical structure bearing capacity and low rock breaking force peak, which is one of the main reasons for blockage and slag accumulation. SUMMARY

[0003] The application provides a slag accumulation prevention crushing system for super-large-diameter slurry balance shield. The overall frame design improves the overall bearing capacity of the crusher; the high-speed rotating grinding head improves the efficiency of rock breaking; the hydraulic system with the functions of hydraulic station pressure boosting and pressure boosting cylinder pressure boosting enhances the peak breaking force of the crusher. The technical scheme is as follows:

[0004] A slag accumulation prevention crushing system for super-large-diameter slurry balance shield, comprising a shell, a jaw plate and a hydraulic cylinder, the hydraulic cylinder is fixed in the shell and connected with the jaw plate, one end surface of the jaw plate is provided with a plurality of hydraulic motors, the other end surface of the jaw plate is provided with a plurality of tooth-shaped structures and a rotating grinding head, and the rotating grinding head is connected with the hydraulic motor.

[0005] Preferably, the shell is designed in a frame type, the upper and lower edges are arc-shaped, and guide rails are arranged on the left and right sides; the rotating grinding head is slightly higher than the tooth-shaped structure, the number of the rotating grinding heads is odd, and the rotating grinding heads are distributed at equal intervals.

[0006] Preferably, the shell bottom is provided with a plurality of tooth-shaped structures.

[0007] Preferably, the shell is provided with a hydraulic cylinder at each end, the movable shaft of each hydraulic cylinder is connected with the jaw plate, one end surface of each jaw plate is provided with a plurality of hydraulic motors, and the other end surface is provided with a plurality of tooth-shaped structures and a rotating grinding head.

[0008] The rotating grinding heads on the two jaw plates are distributed at intervals.

[0009] Preferably, the movement trajectory of the hydraulic cylinder on the jaw plate is the same as the moving direction of the jaw plate.

[0010] Preferably, the hydraulic cylinder control system comprises a hydraulic cylinder, a booster cylinder, a switch valve and a check valve, the high pressure port of the booster cylinder is connected with the rodless cavity of the hydraulic cylinder and the first check valve respectively, the rod cavity of the hydraulic cylinder is connected with the second check valve, the first check valve is connected with the B port of the first switch valve, the low pressure port of the booster cylinder is connected with the A port of the first switch valve, the P port of the first switch valve and the second check valve are connected with the A port and the B port of the second switch valve respectively, the P port of the second switch valve is connected with the oil source system, and the T port of the second switch valve is connected with the oil tank.

[0011] Preferably, the hydraulic motor control system comprises a hydraulic motor and a booster cylinder, the hydraulic motor is connected with the high pressure port of the booster cylinder, the high pressure port of the booster cylinder is connected with the B port of the third switch valve and the fourth switch valve through the third check valve and the fourth check valve respectively, the low pressure port of the booster cylinder is connected with the A port of the third switch valve and the fourth switch valve, the P port of the third switch valve and the fourth switch valve is connected with the A port and the B port of the fifth switch valve respectively, and the P port of the fifth switch valve is connected with the oil source system, and the T port of the fifth switch valve is connected with the oil tank.

[0012] Preferably, the oil source system comprises a motor, a high pressure small flow pump, a low pressure large flow pump, a safety valve and a plug-in valve, the motor is connected with the high pressure small flow pump and the low pressure large flow pump, the high pressure small flow pump is connected with the fifth check valve, the low pressure large flow pump is connected with the sixth check valve, the fifth check valve and the sixth check valve are connected with the safety valve, the low pressure large flow pump is connected with the plug-in valve, and the plug-in valve is connected with the oil tank, the sixth check valve is connected with the control oil way of the sixth switch valve, the A port of the sixth switch valve is connected with the plug-in valve through the first throttle valve, the P port of the sixth switch valve is connected with the low pressure large flow pump through the second throttle valve, and the T port of the sixth switch valve is connected with the oil tank through the third throttle valve.

[0013] Preferably, the hydraulic cylinder normally extends: the second switch valve works at the right position, the oil flows from the P port to the A port, the first switch valve works at the right position, the oil flows from the P port to the B port, and the oil flows into the rodless cavity of the hydraulic cylinder through the first check valve, so that the piston rod of the hydraulic cylinder normally extends; when the oil way pressure on one side of the first check valve rises, the second check valve opens, and the oil flows back to the oil tank through the T port of the second switch valve.

[0014] The hydraulic cylinder normally retracts: the second switch valve works at the left position, the oil flows from the P port to the B port, and the oil flows into the rod cavity of the hydraulic cylinder through the second check valve, so that the piston rod of the hydraulic cylinder normally retracts; when the oil way pressure on one side of the second check valve rises, the first check valve opens, and the oil flows back to the oil tank through the T port of the second switch valve.

[0015] Preferably, the rock breaking condition is:

[0016] Hydraulic cylinder high pressure extension: initially, the motor simultaneously drives the high pressure small flow pump and the low pressure large flow pump, if the slag retention condition occurs, the oil pressure rises, the sixth switch valve works in the left position, at this time the spring side of the plug-in valve is connected to the oil tank, unloading is realized, the plug-in valve is opened, the low pressure large flow pump is unloaded, so that the motor drives the high pressure small flow pump alone to increase the oil pressure;

[0017] The strong rock breaking condition is:

[0018] Hydraulic cylinder super high pressure extension: the displacement sensor judges the slag retention condition, when the load force needs to be further enhanced, the oil source automatically adjusts the pressure size which is insufficient to change the slag retention condition, on the basis of the motor driving the high pressure small flow pump alone to enhance the oil pressure, the second switch valve works in the right position, the oil flows from the P port to the A port, the first switch valve works in the left position, the oil flows from the P port to the A port, the oil flows into the low pressure port of the booster cylinder, the pressure is boosted to push the oil into the rodless cavity of the hydraulic cylinder, so that the hydraulic cylinder piston rod is statically loaded and extended under super high pressure; when the oil pressure on one side of the first check valve rises, the second check valve opens, the oil flows back to the tank through the T port of the second switch valve.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] 1. Overall frame design: the crusher adopts a frame structure, and the stress of the crusher is more uniform through the setting of the arc structure, thereby improving the overall bearing capacity of the crusher.

[0021] 2. High-speed rotating grinding head: a high-speed rotating grinding head driven by a hydraulic motor is arranged on the jaw plate of the crusher, the stone is ground, and the grinding efficiency of the crusher on the rock is improved.

[0022] 3. Hydraulic station pressure boosting system: the oil source is provided with a high pressure small flow pump and a low pressure large flow pump, according to the slag retention condition, the operation condition of the pump is automatically adjusted through the pressure change of the oil source oil circuit, and the crushing force of the crusher is enhanced.

[0023] 4. Booster cylinder pressure boosting system: a super high pressure static loading system is arranged in the hydraulic cylinder and the hydraulic motor control system of the crusher, when large rocks enter the crusher, the booster cylinder is started by controlling the two-position four-way switch valve, higher pressure is provided for the hydraulic cylinder and the hydraulic motor, and the crushing force of the crusher is further enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a front view of the crusher scheme one;

[0025] Figure 2 It is a sectional view of the crusher scheme one;

[0026] Figure 3 It is an isometric view of the crusher scheme one;

[0027] Figure 4 is a front view of the crusher solution two;

[0028] Figure 5 is a first direction isometric view of the crusher solution two;

[0029] Figure 6 is a second direction isometric view of the crusher solution two;

[0030] Figure 7 is a hydraulic schematic of the crusher solution one;

[0031] Figure 8 is a hydraulic schematic of the oil source system.

[0032] 1 - housing, 2 - jaw plate, 3 guide rail, 141 - first hydraulic cylinder, 142 - second hydraulic cylinder, 151 - first hydraulic motor, 152 - second hydraulic motor, 153 - third hydraulic motor, 161 - first high speed rotary mill head, 162 - second high speed rotary mill head, 163 - third high speed rotary mill head, 143 - third hydraulic cylinder, 144 - fourth hydraulic cylinder, 154 - fourth hydraulic motor, 164 - fourth high speed rotary mill head;

[0033] 101 - first on-off valve, 102 - second on-off valve, 103 - third on-off valve, 104 - fourth on-off valve, 105 - fifth on-off valve;

[0034] 111 - sixth on-off valve, 112 - seventh on-off valve, 113 - eighth on-off valve, 114 - ninth on-off valve, 115 - tenth on-off valve, 116 - eleventh on-off valve, 117 - twelfth on-off valve, 118 - thirteenth on-off valve;

[0035] 121 - first hydraulic control check valve, 122 - second hydraulic control check valve, 123 - third hydraulic control check valve, 124 - fourth hydraulic control check valve, 125 - fifth hydraulic control check valve, 126 - sixth hydraulic control check valve, 127 - seventh hydraulic control check valve, 128 - eighth hydraulic control check valve, 129 - ninth hydraulic control check valve, 130 - tenth hydraulic control check valve;

[0036] 131 - first pressure intensifier cylinder, 132 - second pressure intensifier cylinder, 133 - third pressure intensifier cylinder, 134 - fourth pressure intensifier cylinder, 135 - fifth pressure intensifier cylinder, 136 - sixth pressure intensifier cylinder, 137 - seventh pressure intensifier cylinder, 138 - eighth pressure intensifier cylinder;

[0037] 31 - displacement sensor;

[0038] 41 - motor, 42 - high pressure low flow pump, 43 - low pressure high flow pump, 44 - first check valve, 45 - second check valve, 46 - safety valve, 47 - tank, 48 - cartridge valve, 49 - first throttle valve, 50 - second throttle valve, 51 - third throttle valve, 52 - fourteenth on-off valve. DETAILED DESCRIPTION

[0039] For the purposes of this application, a more complete description of the application will be presented in the following with reference to the relevant drawings. The drawings show embodiments of the application. However, the application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of these embodiments is to make the disclosure of the application more thorough and comprehensive.

[0040] A large-diameter slurry balance shield is provided with a slag prevention crushing system, comprising a shell 1, a jaw plate 2 and a hydraulic cylinder, the shell is designed as a frame, the upper and lower edges are arc-shaped, and guide rails 3 are arranged on the left and right sides; the rotary grinding head is slightly higher than the tooth structure, the number is odd, and the rotary grinding heads are distributed at equal intervals. The hydraulic cylinder is fixed in the shell and connected with the jaw plate, a plurality of hydraulic motors are arranged on one end surface of the jaw plate, a plurality of tooth structures and rotary grinding heads are arranged on the other end surface of the jaw plate, and the rotary grinding heads are connected with the hydraulic motors; in embodiment 1, a plurality of tooth structures are arranged on the bottom of the shell (as shown in the figure). In embodiment 2, the shell is provided with a hydraulic cylinder at both ends, the movable shaft of each hydraulic cylinder is connected with the jaw plate, one end surface of one of the jaw plates is provided with two hydraulic motors, the other end surface is provided with a plurality of tooth structures and rotary grinding heads; one hydraulic motor is arranged on the other jaw plate; the rotary grinding heads on the two jaw plates are distributed at intervals (as shown in the figure). Figures 1-3 Figures 4-6

[0041] In embodiment 1, the hydraulic cylinder has two, which are a first hydraulic cylinder 141 and a second hydraulic cylinder 142, the hydraulic motor includes three, which are a first hydraulic motor 151, a second hydraulic motor 152 and a third hydraulic motor 153; the rotary grinding head includes three, which are a first high-speed rotary grinding head 161, a second high-speed rotary grinding head 162 and a third high-speed rotary grinding head 163.

[0042] The upper end of the jaw plate 2 is connected with the first hydraulic cylinder 141 and the second hydraulic cylinder 142, and a plurality of tooth structures are arranged below to crush rocks.

[0043] The jaw plate 2 is provided with the first high-speed rotary grinding head 161 driven by the first hydraulic motor 151, the second high-speed rotary grinding head 162 driven by the second hydraulic motor 152 and the third high-speed rotary grinding head 163 driven by the third hydraulic motor 153.

[0044] ​​One of the jaw plates in embodiment 2 is provided with two hydraulic motors (second hydraulic motor 152 and third hydraulic motor 153) on one end face; the other jaw plate is provided with one hydraulic motor (fourth hydraulic motor 154, driving the fourth high-speed rotating grinding head 164).

[0045] The check valve in the hydraulic cylinder control system and the hydraulic motor control system is a hydraulic control check valve.

[0046] Hydraulic cylinder control system:

[0047] The hydraulic control system of the first hydraulic cylinder 141, the oil source is connected with the P port of the first on-off valve 101, the A port of the first on-off valve 101 is connected with the P port of the sixth on-off valve 111, the B port of the first on-off valve 101 is connected with the second hydraulic control check valve 122; the B port of the sixth on-off valve 111 is connected with the first hydraulic control check valve 121, the A port of the sixth on-off valve 111 is connected with the low pressure port of the first pressure cylinder 131, the high pressure port of the first pressure cylinder 131 is connected with the rodless chamber of the hydraulic cylinder and the first hydraulic control check valve 121. The rod chamber of the hydraulic cylinder is connected with the second hydraulic control check valve 122. The displacement sensor 31 is located on the first hydraulic cylinder 141.

[0048] The hydraulic control system of the second hydraulic cylinder 142, the oil source is connected with the P port of the second on-off valve 102, the A port of the second on-off valve 102 is connected with the P port of the seventh on-off valve 112, the B port of the second on-off valve 102 is connected with the fourth hydraulic control check valve 124; the B port of the seventh on-off valve 112 is connected with the third hydraulic control check valve 123, the A port of the seventh on-off valve 112 is connected with the low pressure port of the second pressure cylinder 132, the high pressure port of the second pressure cylinder 132 is connected with the rodless chamber of the hydraulic cylinder and the third hydraulic control check valve 123. The rod chamber of the hydraulic cylinder is connected with the fourth hydraulic control check valve 124.

[0049] Hydraulic motor control system:

[0050] The hydraulic control system of the first hydraulic motor 151, the oil source system is connected with the P port of the third on-off valve 103, the A port of the third on-off valve 103 is connected with the P port of the eighth on-off valve 113, the B port of the third on-off valve 103 is connected with the P port of the ninth on-off valve 114; the A ports of the eighth on-off valve 113 and the ninth on-off valve 114 are connected with the low pressure ports of the third pressure cylinder 133 and the fourth pressure cylinder 134, the high pressure ports of the third pressure cylinder 133 and the fourth pressure cylinder 134 are connected with the two ends of the first hydraulic motor and the fifth hydraulic control check valve 125 and the sixth hydraulic control check valve 126.

[0051] The oil source system of the second hydraulic motor 151 is connected with the P port of the fourth switch valve 104, the A port of the fourth switch valve 104 is connected with the P port of the tenth switch valve 115, the B port of the fourth switch valve 104 is connected with the P port of the eleventh switch valve 116; the A ports of the tenth switch valve 115 and the eleventh switch valve 116 are connected with the low pressure ports of the fifth and sixth pressure cylinders 135 and 136, and the high pressure ports of the fifth and sixth pressure cylinders 135 and 136 are connected with both ends of the second hydraulic motor and the seventh and eighth hydraulic control one-way valves 127 and 128.

[0052] The oil source system of the third hydraulic motor 153 is connected with the P port of the fifth switch valve 105, the A port of the fifth switch valve 105 is connected with the P port of the twelfth switch valve 117, and the B port of the fifth switch valve 105 is connected with the P port of the thirteenth switch valve 118; the A ports of the twelfth switch valve 117 and the thirteenth switch valve 118 are connected with the low pressure ports of the seventh and eighth pressure cylinders 137 and 138, and the high pressure ports of the seventh and eighth pressure cylinders 137 and 138 are connected with both ends of the third hydraulic motor and the ninth and tenth hydraulic control one-way valves 129 and 130.

[0053] The oil source system:

[0054] The electric motor 41 is connected with the high pressure small flow pump 42 and the low pressure large flow pump 43, the high pressure small flow pump 42 is connected with the first one-way valve 44, the low pressure large flow pump 43 is connected with the second one-way valve 45, the first one-way valve 44 and the second one-way valve 45 are connected with the safety valve 46, the low pressure large flow pump 43 is connected with the cartridge valve 48, and the cartridge valve 48 is connected with the oil tank 47. The second one-way valve 45 is connected with the control oil way of the fourteenth switch valve 52, the A port of the fourteenth switch valve 52 is connected with the cartridge valve 48 through the first throttle valve 49, the P port of the fourteenth switch valve 52 is connected with the low pressure large flow pump 43 through the third throttle valve 51, and the T port of the fourteenth switch valve 52 is connected with the oil tank 47 through the second throttle valve 50.

[0055] Normal condition:

[0056] The first hydraulic cylinder A 141 normally extends: the first switch valve 101 works at the right position, the oil flows from the P port to the A port, the sixth switch valve 111 works at the right position, the oil flows from the P port to the B port, and then flows into the hydraulic cylinder rodless cavity through the first hydraulic control one-way valve 121, so that the hydraulic cylinder piston rod normally extends. When the oil pressure of one side of the first hydraulic control one-way valve 121 rises, the second hydraulic control one-way valve 122 opens, and the oil flows back to the oil tank through the T port of the first switch valve 101.

[0057] First hydraulic cylinder A141 normal retraction: the first switch valve 101 works in left position, oil flows from P port to B port, and then flows into the hydraulic cylinder rod cavity through the second hydraulic control check valve 122, so that the hydraulic cylinder piston rod retracts normally. When the oil pressure on one side of the second hydraulic control check valve 122 rises, the first hydraulic control check valve 121 opens, and the oil flows back to the oil tank through the T port of the first switch valve 101.

[0058] Rock breaking situation:

[0059] First hydraulic cylinder 141 high pressure extension (automatic adjustment of oil source): under the initial condition, the motor 41 drives the high pressure small flow pump 42 and the low pressure large flow pump 43 at the same time. If the slag accumulation situation occurs, the oil pressure rises, and the fourteenth switch valve 52 automatically works in the left position. At this time, the spring side of the plug-in valve 48 is connected to the oil tank, unloading is realized, the plug-in valve 48 is opened, the low pressure large flow pump 43 is unloaded, so that the motor 41 drives the high pressure small flow pump 42 alone to enhance the oil pressure.

[0060] Strong rock breaking situation: first hydraulic cylinder 141 ultra-high pressure extension: the displacement sensor 31 judges the slag accumulation situation. When the load force needs to be further enhanced, and the pressure size of the automatic adjustment of the oil source is still insufficient to change the slag accumulation situation, on the basis of the motor 41 driving the high pressure small flow pump 42 alone to enhance the oil pressure, the first switch valve 101 works in the right position, oil flows from P port to A port, the sixth switch valve 111 works in the left position, oil flows from P port to A port, oil flows into the low pressure port of the first booster cylinder 131, and the pressure is increased to push the oil into the rodless cavity of the first hydraulic cylinder 141, so that the hydraulic cylinder piston rod is statically loaded and extended at ultra-high pressure. When the oil pressure on one side of the first hydraulic control check valve 121 rises, the second hydraulic control check valve 122 opens, and the oil flows back to the oil tank through the T port of the first switch valve 101.

[0061] The control principles of the hydraulic cylinder control, the hydraulic motor control and the oil source system in example 2 are the same as those in example 1, which will not be repeated here.

[0062] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An anti-slag crushing system for an ultra-large diameter slurry shield, characterized in that: It includes a housing, a jaw plate and a hydraulic cylinder. The hydraulic cylinder is fixed in the housing and connected to the jaw plate. One end surface of the jaw plate is provided with multiple hydraulic motors. The other end surface of the jaw plate is provided with multiple tooth structures and a rotating grinding head. The rotating grinding head is connected to the hydraulic motor. It includes a hydraulic cylinder control system; the hydraulic control system includes a booster cylinder, a hydraulic cylinder, a switch valve and a one-way valve, the high-pressure port of the booster cylinder is respectively connected to the rodless chamber of the hydraulic cylinder and the first one-way valve; the rod chamber of the hydraulic cylinder is connected to the second one-way valve, the first one-way valve is connected to the B port of the first switch valve, the low-pressure port of the booster cylinder is connected to the A port of the first switch valve, the P port of the first switch valve and the second one-way valve are respectively connected to the A port and the B port of the second switch valve; the P port of the second switch valve is connected to the oil source system, and its T port is connected to the oil tank; the hydraulic cylinder is provided with a displacement sensor; or, The hydraulic motor control system includes a hydraulic motor and a booster cylinder; the hydraulic motor is respectively connected to the high-pressure ports of the two booster cylinders, and the high-pressure port of each booster cylinder is respectively connected to the B port of the third switch valve and the fourth switch valve through the third one-way valve and the fourth one-way valve, and its low-pressure port is respectively connected to the A port of the third switch valve and the fourth switch valve, and the P port of the third switch valve and the fourth switch valve is respectively connected to the A port and the B port of the fifth switch valve; the P port of the fifth switch valve is connected to the oil source system, and its T port is connected to the oil tank.

2. The anti-slag crushing system for the super-large diameter slurry shield according to claim 1 is characterized in that: The shell is of frame design, with arc-shaped upper and lower edges and guide rails on the left and right sides; the rotating grinding heads are slightly higher than the tooth structure, with an odd number and evenly spaced distribution.

3. The anti-slag crushing system for the super-large diameter slurry shield according to claim 1 is characterized in that: The bottom of the shell is provided with multiple tooth-shaped structures.

4. The anti-slag crushing system for the super-large diameter slurry shield according to claim 1 is characterized in that: Both ends of the housing are provided with hydraulic cylinders, the movable shaft of each hydraulic cylinder is connected to the jaw plate, one end surface of each jaw plate is provided with multiple hydraulic motors, and the other end surface is provided with multiple tooth structures and a rotating grinding head; The rotating grinding heads on the two jaw plates are distributed at intervals; and the rotating grinding heads are connected to a hydraulic motor.

5. The anti-slag crushing system for an ultra-large diameter slurry shield according to any one of claims 1 to 4, characterized in that: The motion track of the hydraulic cylinder on the jaw plate is the same as the moving direction of the jaw plate.

6. The anti-slag crushing system for the super-large diameter slurry shield according to claim 1 is characterized in that: The oil source system includes an electric motor, a high-pressure low-flow pump, a low-pressure high-flow pump, a safety valve and a cartridge valve; the electric motor is connected to the high-pressure low-flow pump and the low-pressure high-flow pump; the high-pressure low-flow pump is connected to the fifth one-way valve, the low-pressure high-flow pump is connected to the sixth one-way valve, the fifth one-way valve and the sixth one-way valve are connected to the safety valve, the low-pressure high-flow pump is connected to the cartridge valve, and the cartridge valve is connected to the oil tank; the sixth one-way valve is connected to the control oil circuit of the sixth switch valve, the A port of the sixth switch valve is connected to the cartridge valve through the first throttle valve, the P port of the sixth switch valve is connected to the low-pressure high-flow pump through the second throttle valve, and the T port of the sixth switch valve is connected to the oil tank through the third throttle valve.

7. The anti-slag crushing system for the super-large diameter slurry shield according to claim 6 is characterized in that: The hydraulic cylinder extends normally: the second switch valve works in the right position, the oil flows from port P to port A, the first switch valve works in the right position, the oil flows from port P to port B, and flows into the rodless cavity of the hydraulic cylinder through the first one-way valve, so that the hydraulic cylinder piston rod extends normally; when the oil circuit pressure on one side of the first one-way valve increases, the second one-way valve opens, and the oil flows back to the oil tank through port T of the second switch valve; The hydraulic cylinder retracts normally: the second switch valve works in the left position, the oil flows from port P to port B, and flows into the rod chamber of the hydraulic cylinder through the second one-way valve, causing the hydraulic cylinder piston rod to retract normally; when the oil circuit pressure on one side of the second one-way valve increases, the first one-way valve opens, and the oil flows back to the oil tank through port T of the second switch valve.

8. The anti-slag crushing system for the super-large diameter slurry shield according to claim 6 is characterized in that: The rock breaking situation is: Hydraulic cylinder high-pressure extension: Initially, the motor drives the high-pressure, low-flow pump and the low-pressure, high-flow pump simultaneously. If slag stagnation occurs, the oil circuit pressure increases, and the sixth switch valve works in the left position. At this time, the spring side of the cartridge valve is connected to the oil tank to achieve unloading, so that the cartridge valve opens and the low-pressure, high-flow pump is unloaded, so that the motor drives the high-pressure, low-flow pump alone to increase the oil pressure; Strong rock breaking conditions are: Ultra-high-pressure extension of the hydraulic cylinder: the displacement sensor judges the slag retention situation. When the load force needs to be further enhanced and the pressure automatically adjusted by the oil source is not enough to change the slag retention situation, the motor alone drives the high-pressure and low-flow pump to enhance the oil pressure. The second switch valve works in the right position, and the oil flows from the P port to the A port. The first switch valve works in the left position, and the oil flows from the P port to the A port. The oil flows into the low-pressure port of the booster cylinder. The pressure increase pushes the oil into the rodless cavity of the hydraulic cylinder, causing the hydraulic cylinder piston rod to extend under ultra-high-pressure static loading. When the oil circuit pressure on one side of the first one-way valve increases, the second one-way valve opens, and the oil flows back to the oil tank through the T port of the second switch valve.

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