Non-contact mud pump protection device for shield tunneling machine, use method thereof and use thereof

Abstract

A non-contact mud pump protection device for a shield tunneling machine. Mud generated during working processes is fed via a feeding pipe (101); then the mud is separately conveyed via a plurality of branches (102) so as to feed same to a mud pump via a discharge pipe (101); and a branch pipe body of each branch (102) is internally provided with an on-off gate (106) and a microwave crushing device (107). The on-off gates (106) control the turning on and off of the branch pipe bodies, such that in case of a blockage occurring to a certain branch pipe body, the corresponding on-off gate (106) disconnects said branch pipe body, then the microwave crushing device (107) crushes rocks inside said branch pipe body while another branch is turned on for mud transportation, and once rock crushing is completed, the other branch is gradually turned off, and the previously blocked branch is turned on again. Therefore, said device enables automatic rock crushing and fully-automated and continuous treatment for entire processes, and provides protection for the mud pump, thus relieving the labor intensity, improving the construction efficiency, and achieving intelligent and efficient construction.

Description

A non-contact mud pump protection device for shield machine and its use method and application Technical Field

[0001] The present invention relates to the field of transmission protection equipment, and in particular to a non-contact mud pump protection device for a shield machine, and a use method and application thereof. Background Art

[0002] A slurry shield machine is a shield machine used for underground tunnel construction. By using slurry-balanced tunneling technology, it can construct tunnels in soft strata and high water levels, and is also suitable for general consolidated strata.

[0003] A slurry shield machine primarily consists of a tunneling head, a shield shell, a propulsion system, a pulse water pump, and a slurry treatment system. During tunneling, the soil in front of the shield head is squeezed into the shield shell, forming a negative pressure slurry ring. This replaces groundwater with slurry, thus achieving slurry-balanced tunneling. Furthermore, the shield shell supports the soil, preventing ground subsidence and ensuring the safety and stability of tunnel construction.

[0004] It is a common phenomenon that large stones appear during the construction of slurry shield machines. Such large stones can easily damage the mud pump and mud pipeline, causing construction to be suspended for repair or replacement of the mud pump or mud pipeline, which not only affects construction efficiency but also increases construction costs.

[0005] The prior art provides a shield machine mud and water circulation and stone crushing system (CN105065007B), which includes a slurry inlet pipe, an air cushion chamber, a discharge pipe, a mud pipe crusher, a slurry pump, and a slurry discharge pipe, which are connected in series via a pipeline. The discharge pipe is used to transport mud and gravel from the air cushion chamber to the mud pipe crusher, which crushes the stones from the air cushion chamber. The mud pipe crusher is a closed jaw crusher that includes a sealing gasket, a frame, and a movable jaw assembly, and can seal mud fluid at a pressure of 0.5 MPa or above. The crusher in the system provided by the present invention has a greater crushing capacity than the hydraulic jaw crusher in the shield machine's air cushion chamber, a longer service life, and higher reliability. It solves the problems of sluggish discharge and pipe blockage that exist in existing shield machines in water-rich sand and gravel. It is also installed on a trailer, reducing the number of times personnel enter the chamber under pressure for maintenance, reducing the cost and construction risks of the shield machine, and improving the geological adaptability and excavation efficiency of the shield machine. However, the above device has a complex structure and will affect the processing speed when processing gravel.

[0006] The prior art also provides a slurry shield anti-clogging slurry pump (CN206309400U) that includes a slurry pump, a quarrying box, and a stone crusher. The stone crusher is located in front of the slurry pump inlet and connected to the quarrying box. When the slurry pump inlet is blocked, the stone crusher is activated to break up the obstruction, thereby dispersing the obstruction and allowing it to enter the slurry circulation system through the slurry pump. The above-mentioned stone crushing mechanism uses a crushing method, which can only work intermittently and the crushing is insufficient, thus reducing work efficiency.

[0007] Summary of the Invention

[0008] The purpose of the present invention is to provide a non-contact mud pump protection device for a shield machine and a method of use and application, which is designed to automatically crush stones, make the entire process fully automatic and continuous, and provide protection for the mud pump, thereby reducing the labor intensity of personnel, improving construction efficiency, and realizing intelligent and efficient construction.

[0009] To achieve the above-mentioned object, in a first aspect, the present invention provides a non-contact mud pump protection device for a shield machine, comprising a feed pipe, wherein the feed pipe is used to input mud;

[0010] a plurality of branches, the plurality of branches being connected to the feed pipe and used for passing mud and crushing stones;

[0011] a discharge pipe, the discharge pipe being used to input the processed mud into a mud pump;

[0012] A control system, wherein the control system is used to control the branch;

[0013] The branch includes a branch pipe body, an on-off gate and a microwave crushing device. A filter is provided in the branch pipe body. The branch pipe body is connected to the feed pipe. The on-off gate is provided on the branch pipe body. The microwave crushing device is provided on one side of the on-off gate. The branch also includes a bottom gate and a stone storage box. The stone storage box is provided at the bottom of the branch pipe body. The bottom gate is provided on one side of the microwave gate for controlling the on and off of the stone storage box.

[0014] Among them, the on-off gate includes an entrance gate, an exit gate and a microwave gate. The entrance gate and the exit gate are respectively arranged on the branch pipe body and located on both sides of the microwave crushing device. The on-off gate is used to open and close the entrance of the microwave crushing device.

[0015] Wherein, the inlet gate, the outlet gate and the microwave gate are driven by either hydraulic drive or motor drive.

[0016] The microwave crushing device includes a microwave power supply, a microwave magnetron, a microwave transmission antenna and a circulator.

[0017] Wherein, the branch further includes a pressure sensor and a flow sensor, and the pressure sensor and the flow sensor are arranged between the inlet gate and the outlet gate.

[0018] The stone storage box includes a box body, a secondary crusher and a pusher blade. The secondary crusher is rotatably arranged in the box body, and the pusher blade is rotatably arranged at the bottom of the secondary crusher.

[0019] Among them, the secondary crusher includes a partition, a guide shell, two crushing rollers, a crushing motor and a reflux shell, the partition has multiple through holes, the partition is fixedly connected to the box body and is located on the top of the box body, the guide shell has a reflux channel, the guide shell is fixed to the partition and is located on the inner side of the partition, the two crushing rollers are arranged at the bottom of the guide shell, the crushing motor is connected to the crushing rollers, and the reflux shell is arranged on one side of the reflux channel.

[0020] The control system includes a detection data acquisition module, a judgment module, a control module and a crushing module, and the detection data acquisition module, the judgment module, the control module and the crushing module are connected in sequence;

[0021] The detection data acquisition module is used to obtain pressure values ​​and flow values;

[0022] The judgment module is used to judge that a blockage state occurs when both the pressure value and the flow value are greater than the program setting value;

[0023] The control module is used to close the corresponding path in a blocked state and open other branches at the same time.

[0024] The crushing module is used to control the microwave crushing device to process the blocked passage.

[0025] In a second aspect, the present invention further provides a method for using a non-contact mud pump protection device for a shield machine, which uses the non-contact mud pump protection device and has two branches, namely a first branch and a second branch, including: S101 during shield construction, the control system opens the entrance gate and the exit gate of the first branch, closes the entrance gate and the exit gate of the second branch, and closes the microwave gates of the first branch and the second branch;

[0026] S102: When the values ​​detected by the pressure sensor and flow sensor of the first branch are both greater than the program set values, the control system automatically opens the inlet gate and outlet gate of the second branch, closes the inlet gate and outlet gate of the first branch, opens microwave gate 1 of the first branch, starts microwave crushing device 1 of the first branch, and large rocks in the pipeline are crushed into small rocks under the action of microwaves. Then, microwave crushing device 1 and microwave gate 1 are closed.

[0027] S103: When the values ​​detected by the pressure sensor and flow sensor of the second branch are both greater than the program set values, the control system automatically opens the inlet gate and outlet gate of the first branch, closes the inlet gate and outlet gate of the second branch, opens the microwave gate 2 of the second branch, starts the microwave crushing device 2 of the second branch, and the large rocks in the pipeline are crushed into small rocks under the action of microwaves. The microwave crushing device 2 and microwave gate 2 are then closed.

[0028] S104 automatically cycles S101 to S103 under the control of the control system to achieve automatic switching between the first branch and the second branch and stone crushing.

[0029] In a third aspect, the present invention also provides an application of a non-contact mud pump protection device for a shield machine, which uses the non-contact mud pump protection device and applies it to a liquid pump with solid impurities at the feed inlet.

[0030] The present invention provides a non-contact mud pump protection device for a shield machine, a method of use, and an application. The mud generated during the working process can be input through the feed pipe, and then the mud can be input into the mud pump through the discharge pipe through multiple branches. However, this application only opens one branch at a time, and the other branches are in a closed state. The branch pipe of the branch is provided with an on-off gate and a microwave crushing device. The on-off gate can be used to control the on-off of the branch pipe, so that when a branch pipe is blocked, the corresponding branch pipe can be disconnected by the on-off gate, and then the microwave crushing device can be used to crush the stones in the branch pipe. At the same time, another branch can be opened to transport mud. After the stone is crushed, the other branch can be gradually closed, and then the previously blocked branch can be reopened, so that the stones can be automatically crushed. The whole process uses microwaves to crush stones, which is non-contact, with small overall vibration, and can be processed automatically and continuously. It also provides protection for the mud pump, which can reduce the labor intensity of personnel, improve construction efficiency, and realize intelligent and efficient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] FIG1 is a structural diagram of a non-contact mud pump protection device for a shield machine according to a first embodiment of the present invention.

[0033] FIG2 is a side structural diagram of a non-contact mud pump protection device for a shield machine according to a second embodiment of the present invention.

[0034] FIG3 is a structural diagram of a non-contact mud pump protection device for a shield machine according to a second embodiment of the present invention.

[0035] FIG4 is a structural diagram of a stone storage box according to a second embodiment of the present invention.

[0036] FIG5 is a structural diagram of a control system according to a second embodiment of the present invention.

[0037] FIG6 is a flow chart of a method for using a non-contact mud pump protection device for a shield machine according to a third embodiment of the present invention.

[0038] Feed pipe 101, branch 102, discharge pipe 103, control system 104, branch pipe body 105, on-off gate 106, microwave crushing device 107, inlet gate 201, outlet gate 202, microwave gate 203, pressure sensor 204, flow sensor 205, bottom gate 206, stone storage box 207, exhaust pipe 208, detection data acquisition module 209, judgment module 210, control module 211, crushing module 212, box body 213, secondary crusher 214, pusher blade 215, partition 216, guide shell 217, crushing roller 218, crushing motor 219, reflux shell 220, through hole 221, reflux channel 222. DETAILED DESCRIPTION

[0039] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0040] First embodiment

[0041] Please refer to Figures 1 and 2. Figure 1 is a structural diagram of a non-contact mud pump protection device for a shield machine according to a first embodiment of the present invention. Figure 2 is a structural diagram of a non-contact mud pump protection device for a shield machine according to a second embodiment of the present invention.

[0042] The present invention provides a non-contact mud pump protection device for a shield machine, comprising a feed pipe 101, the feed pipe 101 being used to input mud; a plurality of branches 102, the plurality of branches 102 being connected to the feed pipe 101 and being used to pass mud and crush stones; a discharge pipe 103, the discharge pipe 103 being used to input the processed mud into the mud pump; a control system 104, the control system 104 being used to control the branch 102; the branch 102 comprising a branch pipe body 105, an on-off gate 106 and a microwave crushing device 107, the branch A filter is provided inside the tube body 105 to prevent large-sized stones from passing through. The branch tube body 105 is connected to the feed pipe 101. The on-off gate 106 is provided on the branch tube body 105. The microwave crushing device 107 is provided on one side of the on-off gate 106. The branch 102 also includes a bottom gate 206 and a stone storage box 207. The stone storage box 207 is provided at the bottom of the branch tube body 105. The bottom gate 206 is provided on one side of the microwave gate 203 to control the on and off of the stone storage box 207.

[0043] In this embodiment, the mud generated during the working process can be input through the feed pipe 101, and then the mud can be input into the mud pump through the discharge pipe 103 through multiple branches 102 respectively. However, this application only opens one branch 102 at a time, and the other branches 102 are in a closed state.

[0044] The branch pipe 105 of the branch 102 is provided with an on-off gate 106 and a microwave crushing device 107. The control system 104 can be integrated into the branch or set separately according to the specific situation. The control system 104 can control the on-off of the branch pipe 105 through the on-off gate 106, so that when a branch pipe 105 is blocked, the corresponding branch pipe 105 can be disconnected by the on-off gate 106, and then the stones in the branch pipe 105 can be crushed by the microwave crushing device 107. When the stone is crushed, the other branch 102 can be opened to transport the mud. After the stone is crushed, the other branch 102 can be gradually closed, and then the previously blocked branch 102 can be reopened, so that the stone can be automatically crushed. The whole process can be fully automatic and continuous, and the mud pump can be protected, so that the labor intensity of the personnel can be reduced, the construction efficiency can be improved, and intelligent and efficient construction can be achieved. When the microwave crushing device 107 fails, the stone can be discharged into the stone storage box through the bottom gate 206 so that it can continue to be used.

[0045] Second embodiment

[0046] Please refer to Figures 3 to 5. Figure 3 is a structural diagram of a non-contact slurry pump protection device for a shield machine according to a second embodiment of the present invention. Figure 4 is a structural diagram of a stone storage box according to a second embodiment of the present invention. Figure 5 is a structural diagram of a control system according to a second embodiment of the present invention.

[0047] Based on the first embodiment, the present invention further provides a non-contact mud pump protection device for a shield machine. The on-off gate 106 includes an inlet gate 201, an outlet gate 202, and a microwave gate 203. The inlet gate 201 and the outlet gate 202 are respectively disposed on the branch pipe body 105 and located on either side of the microwave crushing device 107. The on-off gate 106 is used to open and close the entrance of the microwave crushing device 107. The inlet gate 201 and the outlet gate 202 provide a crushing space, allowing the microwave crushing device 107 to process impurities in the crushing space. The microwave gate 203 is used to control the on and off of the microwave crushing device 107, making it more convenient to use.

[0048] The inlet gate 201, the outlet gate 202 and the microwave gate 203 are driven by hydraulic drive or motor drive.

[0049] The microwave fragmentation device 107 includes a microwave power supply, a microwave magnetron, a microwave transmission antenna, and a circulator. Microwave power supply: Microwave power supplies the energy required for microwave signals. Microwave power supplies typically use high-frequency power sources, such as microwave generators or amplifiers, to generate high-frequency microwave signals.

[0050] Microwave magnetrons can amplify microwave signals to higher power levels. The working principle of microwave magnetrons is to use magnetic fields to guide the flow of electrons in a vacuum, thereby producing a microwave signal amplification effect.

[0051] Microwave transmission antennas transmit microwave signals from one location to another. Microwave transmission antennas typically use high-gain, high-directivity antennas to improve the efficiency and reliability of signal transmission.

[0052] The circulator distributes microwave signals and reduces signal reflections. The circulator is typically composed of four or more branches 102, which can distribute an input signal to two or more output ports, enabling microwave heating.

[0053] The branch 102 further includes a pressure sensor 204 and a flow sensor 205, which are disposed between the inlet gate 201 and the outlet gate 202. The pressure sensor 204 and the flow sensor 205 are used to obtain pressure and flow values.

[0054] The branch line 102 further includes an exhaust pipe 208, which is installed on one side of the branch pipe body 105. When microwaves are turned on to crush rocks, the microwaves heat and evaporate water to produce water vapor. The exhaust pipe 208 is used to discharge the water vapor to avoid high pressure in the pipe.

[0055] The control system 104 includes a detection data acquisition module 209, a judgment module 210, a control module 211, and a crushing module 212. The detection data acquisition module 209, the judgment module 210, the control module 211, and the crushing module 212 are connected in sequence. The detection data acquisition module 209 is used to obtain pressure values ​​and flow values. The judgment module 210 is used to determine that a blockage state exists when both the pressure value and the flow value are greater than program-set values. The control module 211 is used to close the corresponding passage in the blockage state and simultaneously open other branches 102. The crushing module 212 is used to control the microwave crushing device 107 to process the blocked passage.

[0056] The stone storage box includes a box body 213, a secondary crusher 214, and a pusher blade 215. The secondary crusher 214 is rotatably mounted within the box body 213, and the pusher blade 215 is rotatably mounted at the bottom of the secondary crusher 214. To prevent excessive stones in the box body 213 from requiring frequent cleaning, the secondary crusher 214 is disposed within the box body 213. The secondary crusher 214 can further crush the stones entering the box body 213 to a particle size that meets the requirements of the mud pump. The crushed stone particles are then pushed upward by the pusher blade 215 and discharged through the mud pump, making it more convenient to use.

[0057] Specifically, the secondary crusher 214 includes a partition 216, a guide shell 217, two crushing rollers 218, a crushing motor 219 and a reflux shell 220. The partition 216 has a plurality of through holes 221. The partition 216 is fixedly connected to the box body 213 and is located at the top of the box body 213. The guide shell 217 has a reflux channel 222. The guide shell 217 is fixed to the partition 216 and is located on the inner side of the partition 216. The two crushing rollers 218 are arranged at the bottom of the guide shell 217. The crushing motor 219 is connected to the crushing rollers 218. The reflux shell 220 is arranged on one side of the reflux channel 222. The stones crushed by the microwave crushing device pass through the guide shell 217 and enter between the two crushing rollers 218. The crushing rollers 218 are driven to rotate by the crushing motor 219 to crush the stones again. Then the pushing blades 215 are started to allow the stone particles to pass upward from the two sides of the guide shell 217 through the through holes 221 on the partition 216. Those that cannot pass through are moved along the return shell 220 and the return channel 222 again to between the two crushing rollers 218 for crushing, thereby improving the crushing efficiency.

[0058] Third embodiment

[0059] Please refer to FIG. 6 , which is a flow chart of a method for using a non-contact mud pump protection device for a shield machine according to a third embodiment of the present invention.

[0060] Based on the second embodiment, the present invention further provides a method for using a non-contact mud pump protection device for a shield machine, wherein the non-contact mud pump protection device has two branches 102, namely a first branch 102 and a second branch 102, including:

[0061] During the shield construction process S101, the control system 104 opens the entrance gate 201 and the exit gate 202 of the first branch 102, closes the entrance gate 201 and the exit gate 202 of the second branch 102, and closes the microwave gates 203 of the first branch 102 and the second branch 102;

[0062] S102: When the values ​​detected by the pressure sensor 204 and the flow sensor 205 of the first branch 102 are both greater than the program set values, the control system 104 automatically opens the inlet gate 201 and the outlet gate 202 of the second branch 102, closes the inlet gate 201 and the outlet gate 202 of the first branch 102, opens the microwave gate 203 of the first branch 102, and starts the microwave crushing device 107 of the first branch 102. The large rocks in the pipeline are crushed into small rocks under the action of microwaves, and the microwave crushing device 107 and the microwave gate 203 are closed.

[0063] S103: When the values ​​detected by the pressure sensor 204 and the flow sensor 205 of the second branch 102 are both greater than the program settings, the control system 104 automatically opens the inlet gate 201 and the outlet gate 202 of the first branch 102, closes the inlet gate 201 and the outlet gate 202 of the second branch 102, opens the microwave gate 2032 of the second branch 102, activates the microwave crushing device 1072 of the second branch 102, and crushes the large rocks in the pipeline into small rocks under the action of microwaves. The microwave crushing device 1072 and the microwave gate 2032 are then closed.

[0064] S104 automatically cycles through S101 to S103 under the control of the control system 104 to achieve automatic switching between the first branch 102 and the second branch 102 and stone crushing.

[0065] Fourth embodiment

[0066] The present invention provides an application of a non-contact mud pump protection device for a shield machine, adopts the non-contact mud pump protection device described in the first embodiment, and applies the non-contact mud pump protection device to a liquid pump with solid impurities at the feed inlet.

[0067] In this embodiment, the above-mentioned mud pump protection device can also be used for other pump bodies, especially when there are solid impurities in the liquid used in the pump that need to be crushed.

[0068] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of the rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A non-contact mud pump protection device for a shield machine, characterized in that: It includes a feed pipe, and the feed pipe is used to input mud; A plurality of branches, wherein the plurality of branches are connected to the feed pipe and are used for passing mud and crushing stones; A discharge pipe, wherein the discharge pipe is used to input the treated mud into the mud pump; A control system, wherein the control system is used to control the branch; The branch includes a branch pipe body, an on-off gate and a microwave crushing device. A filter is arranged in the branch pipe body. The branch pipe body is connected with the feed pipe. The on-off gate is arranged on the branch pipe body. The microwave crushing device is arranged on one side of the on-off gate. The branch also includes a bottom gate and a stone storage box. The stone storage box is arranged at the bottom of the branch pipe body. The bottom gate is arranged on one side of the microwave gate for controlling the on and off of the stone storage box.

2. A non-contact mud pump protection device for a shield machine as claimed in claim 1, characterized in that: The on-off gate comprises an entrance gate, an exit gate and a microwave gate. The entrance gate and the exit gate are respectively arranged on the branch pipe body and located on both sides of the microwave crushing device. The on-off gate is used to open and close the entrance of the microwave crushing device.

3. A non-contact mud pump protection device for a shield machine as claimed in claim 2, characterized in that: The inlet gate, the outlet gate and the microwave gate are driven by hydraulic drive or motor drive.

4. A non-contact mud pump protection device for a shield machine as claimed in claim 3, characterized in that: The microwave fragmentation device comprises a microwave power supply, a microwave magnetron, a microwave transmission antenna and a circulator.

5. A non-contact mud pump protection device for a shield machine as claimed in claim 4, characterized in that: The branch line further includes a pressure sensor and a flow sensor, and the pressure sensor and the flow sensor are arranged between the inlet gate and the outlet gate.

6. A non-contact mud pump protection device for a shield machine as claimed in claim 5, characterized in that: The stone storage box comprises a box body, a secondary crusher and a push blade. The push blade is arranged in the box body, and the push blade is rotatably arranged at the bottom of the secondary crusher.

7. A non-contact mud pump protection device for a shield machine as claimed in claim 6, characterized in that: The secondary crusher includes a partition, a guide shell, two crushing rollers, a crushing motor and a reflux shell, the partition has a plurality of through holes, the partition is fixedly connected to the box body and is located on the top of the box body, the guide shell has a reflux channel, the guide shell is fixed to the partition and is located on the inner side of the partition, the two crushing rollers are arranged at the bottom of the guide shell, the crushing motor is connected to the crushing rollers, and the reflux shell is arranged on one side of the reflux channel.

8. A non-contact mud pump protection device for a shield machine as claimed in claim 7, characterized in that: The control system comprises a detection data acquisition module, a judgment module, a control module and a crushing module, wherein the detection data acquisition module, the judgment module, the control module and the crushing module are connected in sequence; The detection data acquisition module is used to obtain pressure values ​​and flow values; The judgment module is used to judge that the state is blocked when the pressure value and the flow value are both greater than the program setting value. The control module is used to close the corresponding passage in a blocked state and open other branches at the same time. The crushing module is used to control the microwave crushing device to process the passage in a blocked state.

9. A method for using a non-contact mud pump protection device for a shield machine, using the non-contact mud pump protection device according to claim 8, and having two branches, divided into a first branch and a second branch, It is characterized in that Including: During the S101 shield construction process, the control system opens the entrance gate and exit gate of the first branch, closes the entrance gate and exit gate of the second branch, and closes the microwave gates of the first branch and the second branch; S102 When the values ​​detected by the pressure sensor and the flow sensor of the first branch are both greater than the program setting values, the control system automatically opens the inlet gate and the outlet gate of the second branch, closes the inlet gate and the outlet gate of the first branch, opens the microwave gate 1 of the first branch, starts the microwave crushing device 1 of the first branch, the large stones in the pipeline are crushed into small stones under the action of microwaves, and closes the microwave crushing device 1 and the microwave gate 1; S103 When the values ​​detected by the pressure sensor and flow sensor of the second branch are both greater than the program setting When the value is set, the control system automatically opens the entrance gate and the exit gate of the first branch, closes the entrance gate and the exit gate of the second branch, opens the microwave gate 2 of the second branch, starts the microwave crushing device 2 of the second branch, and the large stones in the pipeline are crushed into small stones under the action of microwaves, and closes the microwave crushing device 2 and the microwave gate 2; S104 automatically cycles through S101 to S103 under the control of the control system to achieve automatic switching between the first branch and the second branch and stone crushing.

10. An application of a non-contact mud pump protection device for a shield machine, using the non-contact mud pump protection device according to any one of claims 1 to 8, characterized in that: The non-contact mud pump protection device is applied to a liquid pump with solid impurities in the feed inlet.

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