A pressure relief device for a tunnel boring machine screw conveyor.

Abstract

This invention discloses a pressure relief device for the gushing slurry of a tunnel boring machine (TBM) screw conveyor, relating to the field of TBM equipment technology. It includes: a pressure relief valve, capable of opening under a set pressure and connected to the slag outlet of the screw conveyor during operation; a separation container connected to the outlet end of the pressure relief valve; a circulating separation mechanism installed inside the separation container, capable of circulating and separating gravel mixed in with the material within the separation container and outputting the gravel; and a collection container for collecting the slurry separated by the circulating separation mechanism, adapted to a slurry pump. This invention can separate gravel mixed in with the slurry gushing from the TBM screw conveyor and send the slurry to a slurry treatment mechanism, thereby avoiding slurry discharge into the tunnel and ensuring construction safety, thus improving the slag removal efficiency of the TBM and reducing construction costs and risks.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) technology, and more specifically to a pressure relief device for a TBM screw conveyor. Background Technology

[0002] During tunnel boring machine (TBM) construction, the screw conveyor is responsible for discharging excavated soil from the excavation chamber. However, the high water content in strata with well-developed groundwater systems and lava flows makes "gushing" phenomena prone to occur. This causes a sudden spray of mud-water mixture from the screw conveyor's discharge port, leading to the following construction challenges: a single gushing event generates more than eight cubic meters of mud, far exceeding the capacity for manual cleaning; the gushing mud, with a solids content of <15% and a mixture of coarse and fine particles, is directly discharged into the tunnel, requiring additional investment in dewatering equipment and manual cleaning, increasing overall costs by more than 40%; the viscosity of the gushing mud is >5000cp, accumulating in the space less than 1.5m high at the bottom of the assembly machine, making mechanical cleaning difficult; it impacts the TBM belt and belt frame, affecting the service life of related equipment; and the excavated soil containing gravel is prone to splashing, threatening construction safety.

[0003] Therefore, there is a need to provide a pressure relief device for the gushing condition of the shield tunnel screw conveyor to prevent the gushing mud from being directly discharged into the tunnel. Summary of the Invention

[0004] To address the technical problem of existing tunnel boring machines (TBMs) directly discharging slurry into the tunnel during the gushing of slurry from their screw conveyors, this invention provides a slurry gushing pressure relief device for TBMs. This device can separate gravel from the slurry gushing from the TBM's screw conveyor and transport the slurry to a slurry treatment facility, thereby preventing slurry discharge into the tunnel and ensuring construction safety. This improves the efficiency of TBM excavation and muck removal, and reduces construction costs and risks.

[0005] This invention is achieved through the following technical solution:

[0006] This invention provides a pressure relief device for a tunnel boring machine screw conveyor, comprising: a pressure relief valve, which is capable of conducting under a set pressure and is connected to the slag outlet of the screw conveyor in the working state; a separation container, connected to the outlet end of the pressure relief valve; a circulating separation mechanism, installed in the separation container, capable of circulatingly separating gravel mixed in with the material in the separation container and outputting the gravel; and a collection container, used to collect the mud separated by the circulating separation mechanism, and adapted to a mud pump.

[0007] The shield tunneling machine screw conveyor gushing pressure relief device provided by this invention includes a pressure relief valve, a separation container, a circulation separation mechanism, and a collection container. The pressure relief valve is connected to the slag outlet of the screw conveyor in the working state and can be opened under a set pressure to automatically gush and relieve pressure when the pressure at the rear of the screw conveyor exceeds the set value, thereby maintaining the pressure balance of the soil chamber. The separation container is connected to the outlet end of the pressure relief valve, and the circulation separation mechanism is installed inside the separation container. Thus, the slurry gushing and relieving from the screw conveyor flows into the separation container, where it is circulated and separated by the circulation separation mechanism to remove gravel mixed in with the slurry and output the gravel. The output gravel is usually transported to the shield tunneling machine's conveyor belt via a chute, while the slurry is collected by the collection container. The slurry collected in the collection container is then transported to a wastewater treatment pond (usually a sedimentation pond) via a slurry pump and a corresponding conveying pipeline, thereby sending the slurry to the slurry treatment mechanism to avoid slurry discharge into the tunnel and ensure construction safety, thereby improving the slag removal efficiency of the shield tunneling machine and reducing construction costs and risks.

[0008] Mud slurry has high viscosity. If static screening components or vibrating screens are used to remove gravel from the mud slurry, it is easy to cause blockage of the screening mechanism, insufficient flow capacity of the screening components to discharge the gushing mud in time, and gravel accumulation on the screening components, which cannot ensure stable pressure relief. However, the present invention uses a circulating separation mechanism to perform circulating separation, which can not only output gravel in time, avoiding gravel splashing and affecting the normal operation of the mud pump, but also ensure that the separation mechanism is in an optimal working state, ensuring that the separation mechanism has sufficient flow capacity to discharge the gushing mud in time, avoiding mud blockage and insufficient flow capacity, thereby enabling the device to stably relieve pressure on the tunnel boring machine's screw conveyor.

[0009] In an optional embodiment of this application, the circulating separation mechanism includes: a tensioning roller assembly installed inside the separation container and located at the feed end of the separation container; a filter belt tensioned on the tensioning roller assembly and divided into a separation section and a cleaning section by the tensioning roller assembly, the separation section being used to filter out gravel from the mud and output the gravel to the separation container; and a cleaning roller installed inside the separation container, capable of self-rotation, and located below the cleaning section, for sweeping away mud adhering to the filter belt; wherein the collection container is an open funnel-shaped container, the collection container being located within the space enclosed by the filter belt, and the opening of the collection container being located below the separation section.

[0010] Therefore, by driving the filter belt to move in a circular motion through the tensioning roller assembly, the filter belt can filter the slurry and transport gravel into the separation container. On the other hand, it can move the filter belt relative to the cleaning roller to remove the slurry adhering to the filter belt, thereby restoring the slurry flow capacity of the corresponding section of the filter belt. The cleaned filter belt is then sent to the feeding section of the separation container, thus ensuring sufficient slurry throughput of the filter belt while achieving cyclic separation.

[0011] In an optional embodiment of this application, the tensioning roller assembly includes: a drive roller mounted on one end of the upper side of the separation container; a first driven roller mounted on the other end of the upper side of the separation container and at least partially located outside the opening of the separation container; and a second driven roller mounted inside the separation container and located below the collection container, so that the collection container can be installed within the space enclosed by the filter belt.

[0012] In an optional embodiment of this application, multiple cleaning rollers are provided, and the multiple cleaning rollers are spaced apart along the length direction of the cleaning section to ensure that the cleaning rollers can effectively remove the mud adhering to the filter belt.

[0013] In an optional embodiment of this application, the cleaning roller is a hollow brush roller, with the brush body of the cleaning roller abutting against the surface of the filter belt; the side wall of the cleaning roller is provided with a plurality of water spray holes, which are positioned directly opposite the brush body; one end of the cleaning roller is provided with a water spray connector for connecting to a clean water source, and the water spray connector is rotatable relative to the cleaning roller. This allows for the input of clean water into the cleaning roller to rinse the roller and scrub the filter belt when it is necessary to clean the cleaning roller and improve its cleaning efficiency.

[0014] In an optional embodiment of this application, the bottom of the separation container is funnel-shaped, and a sewage pump is installed at the bottom of the separation container to facilitate the removal of sewage collected at the bottom of the separation container.

[0015] In an optional embodiment of this application, the filter belt is a polyurethane-coated steel wire mesh belt to improve the non-stick properties of the filter belt and reduce the amount of mud adhering to the filter belt.

[0016] In an optional embodiment of this application, a buffer container is further included. The buffer container is connected between the pressure relief valve and the separation container to buffer the gushing mud, reduce the impact of the mud on the circulating separation mechanism, improve the stability of the circulating separation mechanism and extend its service life.

[0017] In an optional embodiment of this application, the buffer container is provided with: a feed pipe connected to one side of the buffer container and communicating with the inner cavity of the buffer container; a discharge pipe connected to the bottom of the buffer container and disposed on the same side as the feed pipe, with its lower end connected to the feed end of the separation container; a damping shock absorber, one end of which is installed inside the buffer container and disposed directly opposite the discharge end of the feed pipe; a buffer plate, vertically installed on the other end of the damping shock absorber, the cross-section of which is adapted to the cross-section of the inner cavity of the buffer container and is movable along the length direction of the buffer container; and a guide plate, which is installed below the buffer plate and is inclined downward, with one end extending to the opening of the discharge pipe and the other end extending to the side of the buffer plate away from the feed pipe, so as to ensure that the buffer container can effectively absorb the kinetic energy of the gushing mud and reduce the impact of the gushing mud on the buffer container itself.

[0018] In an optional embodiment of this application, the pressure relief valve is an electrically controlled gate valve, which facilitates automatic control of the pressure relief valve while ensuring that the pressure relief valve has sufficient flow capacity to ensure rapid pressure relief of the tunnel boring machine's screw conveyor.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] 1. The shield machine screw conveyor gushing pressure relief device provided by the present invention includes a pressure relief valve, a separation container, a circulation separation mechanism and a collection container. The pressure relief valve is connected to the slag outlet of the screw conveyor in the working state and can be opened under a set pressure so that when the pressure at the rear of the screw conveyor is greater than the set value, it will automatically gush pressure relief, thereby maintaining the pressure balance of the soil chamber.

[0021] 2. The shield tunneling machine screw conveyor jet pressure relief device provided by the present invention has a separation container connected to the outlet end of the pressure relief valve and a circulation separation mechanism installed inside the separation container. This allows the slurry jetted out by the screw conveyor to flow into the separation container, where it is circulated and separated by the circulation separation mechanism to remove gravel mixed in with the slurry. The gravel is then output, and it is usually transported to the shield tunneling machine conveyor belt via a chute. The slurry is collected by a collection container and then transported to a sewage treatment pond via a slurry pump and a corresponding conveying pipeline. This sends the slurry to the slurry treatment mechanism to avoid slurry discharge into the tunnel and ensure construction safety, thereby improving the efficiency of shield tunneling and muck removal, and reducing construction costs and risks.

[0022] 3. The shield machine screw conveyor gushing pressure relief device provided by the present invention uses a circulating separation mechanism for circulation separation. This not only enables timely output of gravel, avoiding gravel splashing and affecting the normal operation of the mud pump, but also ensures that the separation mechanism is in optimal working condition, ensuring sufficient flow capacity to discharge the gushing mud in a timely manner, avoiding mud blockage and insufficient flow capacity. As a result, the device can stably relieve pressure on the shield machine screw conveyor. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] In the attached diagram:

[0025] Figure 1 This is a schematic diagram of the gushing pressure relief device for the screw conveyor of a tunnel boring machine provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the assembly structure of the circulating separation mechanism provided in an embodiment of the present invention, which is assembled in a separation container.

[0027] Figure 3 A schematic diagram of the main body structure of the cleaning roller provided in an embodiment of the present invention;

[0028] Figure 4 This is a cross-sectional view of the buffer container provided in an embodiment of the present invention.

[0029] The attached diagram shows the markings and corresponding component names:

[0030] 100 - Pressure relief valve;

[0031] 200 - Separation container; 210 - Sewage pump;

[0032] 300-Circulation separation mechanism, 310-Filter screen belt, 311-Separation section, 312-Cleaning section, 320-Cleaning roller, 321-Water spray hole, 322-Water spray connector, 331-Drive roller, 332-First driven roller, 333-Second driven roller;

[0033] 400 - Collection container; 410 - Mud pump;

[0034] 500-Buffer container, 510-Infeed pipe, 520-Outfeed pipe, 530-Damping shock absorber, 540-Buffer plate, 550-Guide plate. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the device of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0037] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] It should be noted that areas with well-developed groundwater systems and lava formations have high water content, making them prone to "gushing" phenomena. This causes a sudden spray of mud-water mixture from the slag discharge port of the screw conveyor, with a single gushing event producing more than eight cubic meters of mud, far exceeding the capacity for manual cleanup. Furthermore, if the gushing mud is directly discharged into the tunnel, its solids content is less than 15% and it contains a mixture of coarse and fine particles, requiring additional investment in dewatering equipment and manual cleanup, increasing the overall cost by more than 40%. Moreover, the viscosity of the gushing mud is greater than 5000 cp, accumulating in the space less than 1.5m high at the bottom of the assembly machine, making it difficult for mechanical cleaning equipment to intervene. In addition, the gushing mud impacts the shield machine belt and belt frame, affecting the service life of related equipment, and the slag containing gravel is prone to splashing, threatening construction safety.

[0039] One possible solution is to use polymer modifiers to improve the slag in the soil chamber to prevent the gushing problem. However, this construction method is difficult to implement in practice and the polymer materials are expensive. Another possible solution is to control the gushing by using the double gates of the screw conveyor at the slag outlet alternately and to transfer the slag to the conveyor belt through the double gates. However, this still causes impact on the tunnel boring machine belt and belt frame, affecting the service life of related equipment.

[0040] In response, the inventor has innovatively designed the following technical solution, and the specific implementation scheme of this application will be described in detail below with reference to the accompanying drawings. Example

[0041] Combination Figure 1 This embodiment provides a pressure relief device for a tunnel boring machine screw conveyor, comprising: a pressure relief valve 100, which can be opened under a set pressure and is connected to the slag outlet of the screw conveyor in the working state; a separation container 200, connected to the outlet end of the pressure relief valve 100; a circulating separation mechanism 300, installed in the separation container 200, which can circulate and separate gravel mixed in the material in the separation container 200 and output the gravel; and a collection container 400, used to collect the mud separated by the circulating separation mechanism 300, and is adapted to a mud pump 410.

[0042] Typically, the pressure relief valve 100 is an electrically controlled gate valve to facilitate automatic control while ensuring sufficient flow capacity for rapid pressure relief of the tunnel boring machine's screw conveyor. In operation, the pressure relief valve 100 is usually controlled by a PLC, and a pressure gauge is installed on the screw conveyor to monitor the pressure inside in real time. When the screw conveyor pressure reaches a set value, the PLC controls the operation of the pressure relief valve 100, the circulation separation mechanism 300, and the mud pump 410. Alternatively, the pressure relief valve 100 can be a spring-loaded safety valve, automatically opening when the pressure at the feed end reaches the opening pressure.

[0043] Combination Figure 2 The circulating separation mechanism 300 includes: a tensioning roller assembly installed inside the separation container 200 and located at the feed end of the separation container 200; a filter belt 310 tensioned on the tensioning roller assembly, divided into a separation section 311 and a cleaning section 312 by the tensioning roller assembly, the separation section 311 being used to filter out gravel in the mud and output the gravel to the separation container 200; and a cleaning roller 320 installed inside the separation container 200, capable of self-rotation (adapted with a drive motor), and located below the cleaning section 312, for sweeping away mud adhering to the filter belt 310; wherein, the collection container 400 is an open funnel-shaped container, the collection container 400 being located within the space enclosed by the filter belt 310, and the opening of the collection container 400 being located below the separation section 311.

[0044] Therefore, by driving the filter belt 310 to move cyclically through the tensioning roller group, the filter belt 310 can filter the slurry and transport gravel into the separation container 200. On the other hand, it can move the filter belt 310 relative to the cleaning roller 320 to remove the slurry adhering to the filter belt 310, thereby restoring the slurry flow capacity of the corresponding section of the filter belt 310. The cleaned filter belt 310 is then sent to the feeding section of the separation container 200, thus ensuring sufficient slurry passage capacity of the filter belt 310 while achieving cyclic separation.

[0045] Understandably, the length of the separation section 311 of the filter belt 310 should be greater than the width of the feed channel outlet of the separation container 200. Typically, the length of the separation section 311 of the filter belt 310 is more than three times the width of the feed channel outlet of the separation container 200, and the filter belt 310 is slightly inclined upwards (inclination angle less than 5°). A slag chute is installed below the higher end of the filter belt 310. As the filter belt 310 moves from the feed channel outlet of the separation container 200 to the slag chute, the slurry continuously falls through the mesh of the filter belt 310 into the collection container 400 to ensure that the slurry and the stone mud can be effectively separated.

[0046] In this embodiment, the filter belt 310 is a polyurethane-coated steel wire mesh belt to improve the non-stick properties of the filter belt 310 and reduce the amount of mud adhering to the filter belt 310.

[0047] Specifically, the tensioning roller assembly includes: a drive roller 331, installed at one end of the upper side of the separation container 200; a first driven roller 332, installed at the other end of the upper side of the separation container 200, and at least partially located outside the opening of the separation container 200; and a second driven roller 333, installed inside the separation container 200 and located below the collection container 400, so that the collection container 400 can be installed within the space enclosed by the filter belt 310.

[0048] It is understood that multiple cleaning rollers 320 are provided, and the multiple cleaning rollers 320 are spaced apart along the length direction of the cleaning section 312 to ensure that the cleaning rollers 320 can effectively remove the mud attached to the filter belt 310.

[0049] Combination Figure 3The cleaning roller 320 is a hollow brush roller, with the brush body of the cleaning roller 320 abutting against the surface of the filter belt 310. Multiple water spray holes 321 are provided on the side wall of the cleaning roller 320, and the water spray holes 321 are positioned directly opposite the brush body. A water spray connector 322 is provided at one end of the cleaning roller 320, which is used to connect to a clean water source and is rotatable relative to the cleaning roller 320 (the water spray connector 322 is fixed to the side wall of the separation container 200, and the roller rotates around the water spray connector 322). This allows for the input of clean water into the cleaning roller 320 to rinse the roller and wash the filter belt 310 when it is necessary to clean the cleaning roller and improve its cleaning efficiency.

[0050] Accordingly, the bottom of the separation container 200 is funnel-shaped, and a sewage pump 210 is installed at the bottom of the separation container 200 to facilitate the removal of sewage collected at the bottom of the separation container 200.

[0051] Based on this, this embodiment also includes a buffer container 500, which is connected between the pressure relief valve 100 and the separation container 200 to buffer the gushing mud, reduce the impact of the mud on the circulating separation mechanism 300, improve the stability of the operation of the circulating separation mechanism 300 and extend its service life.

[0052] Combination Figure 4 The buffer container 500 is provided with: a feed pipe 510, connected to one side of the buffer container 500 and communicating with the inner cavity of the buffer container 500; a discharge pipe 520, connected to the bottom of the buffer container 500, arranged on the same side as the feed pipe 510, and its lower end connected to the feed end of the separation container 200; a damping shock absorber 530 (adapted with a hydraulic cylinder and a return spring), one end of which is installed inside the buffer container 500 and is arranged directly opposite the discharge end of the feed pipe 510; and a buffer plate 540, which is vertically installed on the buffer container 500. At the other end of the damping shock absorber 530, the cross-section is adapted to the inner cavity cross-section of the buffer container 500 and can move along the length direction of the buffer container 500; the guide plate 550 is installed below the buffer plate 540, inclined downward, with one end extending to the opening of the discharge pipe 520 and the other end extending to the side of the buffer plate 540 away from the feed pipe 510, so as to ensure that the buffer container 500 can effectively absorb the kinetic energy of the gushing mud, while reducing the impact of the gushing mud on the buffer container 500 itself.

[0053] In summary, the shield tunneling machine screw conveyor pressure relief device provided in this embodiment includes a pressure relief valve 100, a separation container 200, a circulating separation mechanism 300, a collection container 400, and a buffer container 500. The pressure relief valve 100 is connected to the slag outlet of the screw conveyor in the working state and can be opened under a set pressure to automatically release pressure when the pressure at the rear of the screw conveyor exceeds the set value, thereby maintaining a stable pressure in the soil chamber. The buffer container 500 is connected between the pressure relief valve 100 and the separation container 200, and the circulating separation mechanism 300 is installed inside the separation container 200.

[0054] Therefore, when the pressure inside the screw conveyor reaches the set value, the pressure relief valve 100 opens, simultaneously activating the drive roller 331, the cleaning roller 320, and the mud pump 410 (ensuring a difference between the linear velocity of the cleaning roller 320 and the moving speed of the filter belt 310, ensuring the brushes of the cleaning roller 320 can remove the mud from the filter belt 310). The mud gushing out from the screw conveyor flows into the buffer container 500 and impacts the buffer plate 540, driving the damping shock absorber 530 to reciprocate, thereby absorbing the kinetic energy of the gushing mud and slowing down the movement speed of the gravel mixed in the mud and the flow rate of the mud. The mud and gravel, after absorbing energy through the buffer plate 540, are guided by the guide plate 550 to the discharge pipe 520 of the buffer container 500, thus entering the feed channel of the separation container 200 and being discharged through the discharge port of the feed channel of the separation container 200.

[0055] The slurry output from the discharge port of the feed channel of the separation container 200 directly impacts the filter belt 310. The filter belt 310 moves from the feed channel of the separation container 200 towards the slag chute. As the filter belt 310, carrying slurry, moves the gravel towards the slag chute, the slurry falls through the mesh of the filter belt 310 into the collection container 400. At the same time, after the filter belt 310 moves to the first driven roller 332, it flips downward and moves to contact the cleaning roller 320. The relative movement between the cleaning roller 320 and the filter belt 310 removes the slurry adhering to the filter belt 310. After cleaning, driven by the drive roller 331, it returns to below the discharge port of the feed channel of the separation container 200 to separate the gravel again with optimal slurry throughput. This process is repeated to separate the gravel mixed in with the slurry and output the gravel. The output gravel is transported to the tunnel boring machine's conveyor belt via a chute, while the mud is collected in a collection container 400. The mud collected in the collection container 400 is then transported to a wastewater treatment pond (usually a sedimentation pond located outside the tunnel) via a mud pump 410 and a corresponding conveying pipeline. This sends the mud to the mud treatment facility to prevent mud discharge into the tunnel and ensure construction safety, thereby improving the tunnel boring machine's muck removal efficiency and reducing construction costs and risks.

[0056] In this embodiment, the circulating separation mechanism 300 is used for circulating separation, which not only outputs the gravel in a timely manner, avoiding gravel splashing and affecting the normal operation of the mud pump 410, but also ensures that the separation mechanism is in a better working state, ensuring that the separation mechanism has sufficient flow capacity to discharge the gushing mud in a timely manner, avoiding mud blockage and insufficient flow capacity, thereby enabling the device to stably depressurize the tunnel boring machine screw conveyor.

[0057] In summary, the shield machine screw conveyor gushing pressure relief device provided in this embodiment can separate gravel mixed in with the slurry gushing out by the shield machine screw conveyor and send the slurry to the slurry treatment unit to avoid slurry discharge into the tunnel and ensure construction safety, thereby improving the shield machine's excavation and muck removal efficiency and reducing construction costs and risks.

[0058] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressure relief device for a tunnel boring machine's screw conveyor, characterized in that, include: The pressure relief valve (100) can be opened under a set pressure and is connected to the slag outlet of the screw conveyor in the working state; A separation container (200) is connected to the outlet end of the pressure relief valve (100); A circulating separation mechanism (300), installed inside the separation container (200), is capable of cyclically separating gravel mixed in with the material inside the separation container (200) and outputting the gravel. The circulating separation mechanism (300) includes: The tensioning roller assembly is installed inside the separation container (200) and located at the feed end of the separation container (200); A filter belt (310) is stretched on the stretching roller group and is divided into a separation section (311) and a cleaning section (312) by the stretching roller group. The separation section (311) is used to filter out gravel in the mud and output the gravel to the separation container (200). A cleaning roller (320), installed inside the separation container (200), is capable of self-rotation and is located on the lower side of the cleaning section (312) for sweeping away the mud adhering to the filter belt (310); A collection container (400) is used to collect the mud separated by the circulating separation mechanism (300), and is equipped with a mud pump (410). It is an open funnel-shaped container located in the space enclosed by the filter belt (310), and the opening is located on the lower side of the separation section (311). A buffer container (500), connected between the pressure relief valve (100) and the separation container (200), is provided with: The feed pipe (510) is connected to one side of the buffer container (500) and communicates with the inner cavity of the buffer container (500); The discharge pipe (520) is connected to the bottom of the buffer container (500), and is arranged on the same side as the feed pipe (510). Its lower end is connected to the feed end of the separation container (200). A damping shock absorber (530) is installed at one end inside the buffer container (500) and is positioned directly opposite the discharge end of the feed pipe (510); A buffer plate (540) is vertically installed on the other end of the damping shock absorber (530), and its cross-section is adapted to the inner cavity cross-section of the buffer container (500), and it can move along the length direction of the buffer container (500). The guide plate (550) is installed below the buffer plate (540) and is inclined downward. One end extends to the opening of the discharge pipe (520), and the other end extends to the side of the buffer plate (540) away from the feed pipe (510).

2. The shield machine screw conveyor jet pressure relief device according to claim 1, characterized in that, The tensioning roller assembly includes: A drive roller (331) is installed at one end of the upper side of the separation container (200); The first driven roller (332) is mounted on the other end of the upper side of the separation container (200) and is at least partially located outside the opening of the separation container (200); The second driven roller (333) is installed inside the separation container (200) and located below the collection container (400).

3. The shield machine screw conveyor jet pressure relief device according to claim 1, characterized in that, Multiple cleaning rollers (320) are provided, and the multiple cleaning rollers (320) are spaced apart along the length direction of the cleaning section (312).

4. The shield machine screw conveyor jet pressure relief device according to claim 3, characterized in that, The cleaning roller (320) is a hollow brush roller, and the brush body of the cleaning roller (320) abuts against the surface of the filter belt (310); The cleaning roller (320) has a plurality of water spray holes (321) on its side wall, and the water spray holes (321) are positioned directly opposite the brush body; One end of the cleaning roller (320) is provided with a water spray connector (322), which is used to connect to a clean water source, and the roller body of the cleaning roller (320) can rotate around the water spray connector (322).

5. The shield machine screw conveyor jet pressure relief device according to claim 4, characterized in that, The bottom of the separation container (200) is funnel-shaped, and a sewage pump (210) is installed at the bottom of the separation container (200).

6. The shield machine screw conveyor jet pressure relief device according to claim 1, characterized in that, The filter belt (310) is a polyurethane-coated steel wire mesh belt.

7. The shield machine screw conveyor jet pressure relief device according to any one of claims 1 to 6, characterized in that, The pressure relief valve (100) is an electrically controlled gate valve.

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