Slurry shield machine

Abstract

The present invention relates to a slurry shield machine, comprising: a chamber body (100), wherein the chamber body (100) comprises an excavation chamber (110) and an air cushion chamber (120) which are arranged at an interval and in communication with each other, and an opening is formed in the side of the excavation chamber (110) facing away from the air cushion chamber (120); a cutter head (300), wherein the cutter head (300) is rotatably arranged on the opening side of the excavation chamber (110); a slurry intake assembly (700) for feeding slurry into the chamber body (100); a slurry discharge assembly (400), wherein a slurry discharge pipe (410) of the slurry discharge assembly (400) is in communication with the chamber body (100); and a pressure-maintaining device (800), comprising a first pressure-maintaining assembly (810), wherein the first pressure-maintaining assembly (810) is configured to inject a gas into or discharge a gas from the excavation chamber (110), and the first pressure-maintaining assembly (810) is configured to inject the gas into the excavation chamber (110) filled with slurry, so that the slurry in the excavation chamber (110) is discharged through the slurry discharge pipe (410), thereby reducing the level of slurry in the excavation chamber (110). By means of the slurry shield machine described above, when excavating soil that easily forms mud cakes, the risk of equipment damage is low, and the operating efficiency is high.

Description

Slurry Shield Machine Technical Field

[0001] The present application relates to the field of tunnel engineering construction equipment, and in particular to a slurry shield machine. Background Art

[0002] A slurry shield is an advanced tunnel boring machine that uses mud with a certain pressure to support and stabilize the excavation surface, and excavates the soil using a rotating cutterhead, a rotary arm cutter head, or a hydraulic jet. It is now widely used in tunnel projects such as urban rail transit, railways, highways, municipal engineering, and hydropower. Typically, a slurry shield machine has an air cushion chamber and an excavation chamber. When working, the excavation chamber is filled with mud. The air pressure in the air cushion chamber is adjusted to control the mud pressure in the excavation chamber to support and stabilize the excavation surface. In related technologies, when excavating in soil that is prone to mud cake formation, the cutterhead and tools of the slurry shield often form mud cakes, resulting in damage to the slurry shield equipment and reduced construction efficiency. Summary of the Invention

[0003] Based on this, it is necessary to provide a slurry shield machine to address the problem that when existing slurry shield machines are excavating in soil that is prone to mud cake formation, the cutter head and cutters of the slurry shield machine often form mud cakes, resulting in damage to the slurry shield machine equipment and reduced construction efficiency.

[0004] A slurry shield machine, comprising:

[0005] The chamber body comprises an excavation chamber and an air cushion chamber which are arranged at intervals and communicate with each other, wherein an opening is provided on a side of the excavation chamber which is away from the air cushion chamber;

[0006] a cutterhead rotatably disposed on an opening side of the excavation chamber;

[0007] a slurry feeding assembly configured to fill the silo with slurry; a slurry discharging assembly, wherein the slurry discharging pipe of the slurry discharging assembly is connected to the silo;

[0008] The pressure maintaining device includes a first pressure maintaining component, which is used to inject or discharge gas into the excavation chamber. The first pressure maintaining component is configured to inject gas into the excavation chamber filled with mud, so that the mud in the excavation chamber is discharged through the slurry discharge pipe, thereby lowering the mud level in the excavation chamber.

[0009] In one embodiment, the slurry inlet assembly is configured to fill mud into part of the space inside the bin body, and the pressure maintaining device includes a second pressure maintaining assembly, which is configured to inject gas into the air cushion bin to press the mud in the air cushion bin into the excavation bin, so that the excavation bin is filled with mud.

[0010] In one embodiment, a controller is further included. A laser level meter is provided in the excavation chamber. The laser level meter, the first pressure maintaining component and the slurry discharge pipe are all communicatively connected to the controller. The laser level meter is used to measure the mud level. When the mud level in the excavation chamber drops to a preset height, the controller can close the first pressure maintaining component and the slurry discharge pipe.

[0011] In one embodiment, it also includes a first fixed liquid level meter, which is communicatively connected to the controller. The preset height includes a first preset height. The first fixed liquid level meter is located at the first preset height in the excavation bin. The first preset height is located below the laser level meter. When the mud level in the excavation bin drops to the first fixed liquid level meter, the controller can close the first pressure maintaining assembly and the slurry discharge pipe.

[0012] In one embodiment, a second fixed liquid level gauge is further included, which is communicatively connected to the controller. The preset height includes a second preset height. The second fixed liquid level gauge is located at the second preset height in the excavation bin, and the second preset height is located below the first preset height. When the mud level in the excavation bin drops to the second fixed liquid level gauge, the controller can close the first pressure maintaining assembly and the slurry discharge pipe. When one of the first fixed liquid level gauge and the second fixed liquid level gauge is started, the other is closed.

[0013] In one embodiment, a connecting pipe is included, which is located below the first fixed liquid level gauge, with one end connected to the excavation chamber and the other end connected to the air cushion chamber.

[0014] In one embodiment, the connecting pipe includes a first branch pipe, which is located between the first fixed liquid level gauge and the second fixed liquid level gauge. When the first fixed liquid level gauge is working, the first branch pipe is connected, and when the second fixed liquid level gauge is working, the first branch pipe is closed.

[0015] In one embodiment, the connecting pipe further includes a second branch pipe, and the second branch pipe is located below the second fixed liquid level gauge.

[0016] In one embodiment, the slurry inlet assembly includes a first slurry inlet pipe and a second slurry inlet pipe, the slurry outlet of the first slurry inlet pipe is connected to the air cushion chamber, and the slurry outlet of the second slurry inlet pipe is connected to the excavation chamber.

[0017] In one embodiment, a discharge pipe is provided on the top of the first pressure maintaining assembly, and one end of the discharge pipe is connected to the top of the excavation chamber for discharging the air in the excavation chamber.

[0018] In one embodiment, a cutter disc slurry inlet pipe is included, and the cutter disc slurry inlet pipe is used to transmit slurry to flush the cutter disc.

[0019] During operation, when the above-mentioned slurry shield machine is excavating soil that is prone to forming mud cakes, the first pressure-maintaining component injects gas into the excavation chamber filled with mud, and the slurry discharge pipe draws slurry from the chamber body to lower the liquid level of the mud in the excavation chamber, that is, a portion of the space at the top of the excavation chamber is filled with gas. Since there is no mud in the portion of the space at the top of the excavation chamber, when the cutterhead excavates the soil layer, the soil layer at this position is not easy to soften and adhere to the cutterhead to form mud cakes, thereby reducing the probability of the cutterhead forming mud cakes, reducing the risk of shield machine equipment damage, and improving work efficiency. When the above-mentioned slurry shield machine is excavating soil that is prone to forming mud cakes, the risk of equipment damage is low and work efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a slurry shield machine according to an embodiment of the present application;

[0021] FIG2 is a schematic structural diagram of the excavation chamber shown in FIG1 of the present application when it is filled with mud;

[0022] FIG3 is a schematic diagram of the structure when the slurry level in the excavation chamber shown in FIG1 of the present application is higher than a first preset height;

[0023] FIG4 is a schematic structural diagram of the excavation chamber shown in FIG1 of the present application when the slurry level in the excavation chamber is higher than a second preset height.

[0024] Figures and symbols: Bin body 100, excavation bin 110, air cushion bin 120; liquid level assembly 200, laser liquid level gauge 210, first fixed liquid level gauge 220; cutterhead 300; slurry discharge assembly 400, slurry discharge pipe 410, slurry discharge valve 420; cutterhead slurry inlet pipe 500; connecting assembly 600, second connecting piece 610, second branch pipe 611, second branch valve 612, first connecting piece 620, first branch pipe 621, first branch valve 622, third connecting pipe 630; slurry inlet assembly 700, first slurry inlet pipe 710, second slurry inlet pipe 720; pressure maintaining device 800, first pressure maintaining assembly 810, first air pressure regulating member 811, first vent pipe 812, first vent valve 813, second pressure maintaining assembly 820, second air pressure regulating member 821, second vent pipe 822; Discharge assembly 900 , discharge pipe 910 , discharge valve 920 . DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0027] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0028] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0031] Referring to FIG1 , FIG1 shows a schematic structural diagram of a slurry shield machine according to an embodiment of the present application. The slurry shield machine provided in one embodiment of the present application includes: a chamber 100, a cutterhead 300, a slurry feed assembly 700, and a pressure maintaining device 800. The chamber 100 includes an excavation chamber 110 and an air cushion chamber 120 arranged at intervals and interconnected. The excavation chamber 110 has an opening on a side facing away from the air cushion chamber 120, and the cutterhead 300 is rotatably disposed on the opening side of the excavation chamber 110. The slurry inlet assembly 700 is used to fill mud into the bin body 100, the slurry discharge pipe 410 of the slurry discharge assembly 400 is connected to the bin body 100, and the pressure maintaining device 800 includes a first pressure maintaining assembly 810, which is used to inject or discharge gas into the excavation bin 110. The first pressure maintaining assembly 810 is configured to inject gas into the excavation bin 110 filled with mud, so that the mud in the excavation bin 110 is discharged through the slurry discharge pipe 410, thereby lowering the mud liquid level in the excavation bin 110.

[0032] In this embodiment, when the slurry shield machine is operating and excavating soil that is prone to mud cake formation, the first pressure-maintaining assembly 810 injects gas into the excavation chamber 110 filled with mud, and the slurry discharge pipe 410 draws slurry from the chamber body 100 to lower the slurry level in the excavation chamber 110, that is, the top portion of the excavation chamber 110 is filled with gas. Since the top portion of the excavation chamber 110 is free of mud, the soil at this location is less likely to soften and adhere to the cutterhead 300 to form mud cakes when the cutterhead 300 excavates the soil layer. This reduces the probability of mud cake formation on the cutterhead 300, reduces the risk of shield machine equipment damage, and improves work efficiency. When the slurry shield machine is excavating soil that is prone to mud cake formation, the risk of equipment damage is low and work efficiency is high.

[0033] In some embodiments, the slurry discharge assembly 400 further includes a slurry discharge valve 420 , which is used to control the flow rate of the fluid passing through the slurry discharge pipe 410 .

[0034] Referring to Figures 1 and 2, in some embodiments, the slurry inlet assembly 700 can fill mud into part of the space in the bin body 100, and the pressure maintaining device 800 includes a second pressure maintaining assembly 820. The second pressure maintaining assembly 820 can inject gas into the air cushion bin 120 to press the mud in the air cushion bin 120 into the excavation bin 110, so that the excavation bin 110 is filled with mud.

[0035] In this embodiment, when working, the slurry inlet component 700 fills part of the space in the silo 100 with mud, and air is left in part of the space in the silo 100. The excavation chamber 110 and the air cushion chamber 120 are connected. The mud filled in the silo 100 is divided into two parts, which are respectively located inside the excavation chamber 110 and the air cushion chamber 120, and occupy part of the space of the excavation chamber 110 and the air cushion chamber 120. The second pressure maintaining component 820 injects gas into the air cushion chamber 120. The gas entering the air cushion chamber 120 applies pressure to the mud in the air cushion chamber 120, pressing it into the excavation chamber 110, so that the excavation chamber 110 is filled with mud, thereby increasing the pressure in the excavation chamber 110, making it easier for the cutter head 300 to excavate the soil layer.

[0036] In some embodiments, the second pressure maintaining assembly 820 includes a second vent pipe 822 and a second air pressure regulating component 821. The second vent pipe 822 is connected to the air cushion chamber 120 and is used to inject or discharge gas into or out of the air cushion chamber 120. The second air pressure regulating component 821 is used to control the pressure of the gas in the air cushion chamber 120 to control the liquid level of the mud in the air cushion chamber 120, thereby adjusting the pressure in the excavation chamber 110.

[0037] Referring to Figure 2, in some embodiments, a controller (not shown) is further included. A laser level meter 210 is provided in the excavation chamber 110. The laser level meter 210, the first pressure maintaining component 810 and the slurry discharge pipe 410 are all communicatively connected to the controller. The laser level meter 210 is used to measure the mud level. When the mud level in the excavation chamber 110 drops to a preset height, the controller can close the first pressure maintaining component 810 and the slurry discharge pipe 410.

[0038] In this embodiment, during operation, gas is introduced into the excavation chamber 110 via the first pressure-maintaining assembly 810. The gas entering the excavation chamber 110 applies pressure to the slurry within the excavation chamber 110, forcing the slurry out of the excavation chamber 110 through the slurry discharge pipe 410, thereby lowering the slurry level within the excavation chamber 110. During this process, the laser level meter 210 detects the slurry level and transmits the detection result to the controller. When the slurry level within the excavation chamber 110 drops to a preset height, the controller closes the first pressure-maintaining assembly 810 and the slurry discharge pipe 410, ensuring that the slurry level within the excavation chamber 110 meets the preset height. By controlling the slurry level within the excavation chamber 110, the space occupied by the slurry within the excavation chamber 110 is adjusted, thereby controlling the volume of the space without slurry within the excavation chamber 110 and ultimately controlling the probability of mud cake formation on the cutterhead 300. For example, lowering the slurry level within the excavation chamber 110 reduces the probability of mud cake formation on the cutterhead 300.

[0039] Optionally, the laser level meter 210 may be replaced by other level sensors, such as a float-type level sensor, a float-type level sensor, or a static pressure level sensor.

[0040] In some embodiments, the first pressure maintaining assembly 810 includes a first air pressure regulating component 811 and a first vent pipe 812. The first vent pipe 812 is connected to the excavation chamber 110 and is used to inject or discharge gas into or out of the excavation chamber 110. The first air pressure regulating component 811 is used to control the pressure of the gas in the excavation chamber 110 to control the liquid level of the mud in the excavation chamber 110.

[0041] In some embodiments, the first pressure maintaining assembly 810 includes a first vent valve 813 , which is used to control the flow rate of the fluid passing through the first vent pipe 812 .

[0042] Referring to Figure 2, in some embodiments, a first fixed liquid level meter 220 is included, and the first fixed liquid level meter 220 is communicatively connected to the controller. The preset height includes a first preset height. The first fixed liquid level meter 220 is located at the first preset height in the excavation chamber 110. The first preset height is located below the laser level meter 210. When the mud level in the excavation chamber 110 drops to the first fixed liquid level meter 220, the controller can close the first pressure maintaining assembly 810 and the slurry discharge pipe 410.

[0043] Figure 3 is a structural diagram of the case where the mud level in the excavation bin 110 shown in Figure 1 is higher than the first preset height. In this embodiment, during operation, the mud level in the excavation bin 110 drops, and the laser level meter 210 and the first fixed level meter 220 respectively detect the mud level in real time and transmit the detection results to the controller respectively. The controller closes the first pressure-maintaining component 810 and the slurry discharge pipe 410 when the mud level in the excavation bin 110 drops to the first preset height based on the received detection results. In summary, by detecting the mud level by the laser level meter 210 and the first fixed level meter 220 respectively, it can be ensured that the first pressure-maintaining component 810 and the slurry discharge pipe 410 are closed when the mud level drops to the first preset height, thereby avoiding the controller from closing the first pressure-maintaining component 810 and the slurry discharge pipe 410 too early or too late due to inaccurate detection results of the laser level meter 210.

[0044] Referring to Figure 2, in some embodiments, a second fixed liquid level gauge (not shown) is included, the second fixed liquid level gauge is communicatively connected to the controller, the preset height includes a second preset height, the second fixed liquid level gauge is located at the second preset height in the excavation bin 110, and the second preset height is located below the first preset height. When the mud level in the excavation bin 110 drops to the second fixed liquid level gauge, the controller can close the first pressure maintaining assembly 810 and the slurry discharge pipe 410. When one of the first fixed liquid level gauge 220 and the second fixed liquid level gauge is started, the other is closed.

[0045] Specifically, in this embodiment, when the first fixed liquid level meter 220 is started and the second fixed liquid level meter is turned off, the mud level in the excavation chamber 110 drops, the laser level meter 210 and the first fixed liquid level meter 220 perform real-time detection of the mud level, and transmit the detection results to the controller respectively. Based on the received detection results, the controller closes the first pressure maintaining assembly 810 and the slurry discharge pipe 410 when the mud level in the excavation chamber 110 drops to a first preset height.

[0046] FIG4 is a schematic diagram of the structure shown in FIG1 when the slurry level in the excavation chamber 110 is higher than the second preset height. When the first fixed level gauge 220 is turned off and the second fixed level gauge is turned on, the slurry level in the excavation chamber 110 drops. The laser level gauge 210 and the second fixed level gauge detect the slurry level in real time and transmit the detection results to the controller. Based on the received detection results, the controller closes the first pressure-maintaining assembly 810 and the slurry discharge pipe 410 when the slurry level in the excavation chamber 110 drops to the second preset height.

[0047] To sum up, by setting the first fixed liquid level meter 220 and the second fixed liquid level meter at the first preset height and the second preset height respectively, it is avoided that when the mud level is to drop to the first preset height or the second preset height, the laser level meter 210 has inaccurate detection results, causing the controller to close the first pressure maintaining component 810 and the slurry discharge pipe 410 too early or too late.

[0048] 2 , in some embodiments, a connecting pipe 600 is included. The connecting pipe 600 is located below the first fixed liquid level gauge 220 , and one end of the connecting pipe 600 is connected to the excavation chamber 110 , and the other end is connected to the air cushion chamber 120 .

[0049] In this embodiment, the excavation chamber 110 and the air cushion chamber 120 are connected by the connecting pipe 600, so that when gas is filled in the excavation chamber 110, the mud in the excavation chamber 110 can flow into the air cushion chamber 120 through the connecting pipe 110, thereby avoiding the accumulation of stones at the bottom of the excavation chamber 110, which causes the passage between the excavation chamber 110 and the air cushion chamber 120 to be blocked, resulting in the mud in the excavation chamber 110 being unable to flow out of the slurry discharge pipe 410 and the liquid level being unable to be lowered.

[0050] In some embodiments, the connecting pipe 600 is located below the second fixed liquid level gauge.

[0051] 2 , in some embodiments, the connecting pipe 600 includes a first branch pipe 621 , which is located between the first fixed liquid level gauge 220 and the second fixed liquid level gauge. When the first fixed liquid level gauge 220 is working, the first branch pipe 621 is connected, and when the second fixed liquid level gauge is working, the first branch pipe 621 is closed.

[0052] In this embodiment, when the slurry level in the excavation chamber 110 drops to a first preset height and the first fixed liquid level gauge 220 operates, the slurry is connected via the first branch pipe 621. Furthermore, the first branch pipe 621 is disposed between the first fixed liquid level gauge 220 and the second fixed liquid level gauge. This prevents the first branch pipe 621 from being blocked by rocks accumulated at the bottom of the excavation chamber 110, thereby facilitating the transfer of slurry from the excavation chamber 110 to the air cushion chamber 120. Specifically, the shorter the distance between the first branch pipe 621 and the first fixed liquid level gauge 220, the more rocks accumulated at the bottom of the excavation chamber 110 are required to block the first branch pipe 621.

[0053] When the mud level in the excavation chamber 110 drops to the second preset height, the second fixed liquid level gauge is working and is closed through the first branch pipe 621, thereby preventing the gas entering the excavation chamber 110 from the first pressure maintaining assembly 810 and entering the air cushion chamber 120 through the first branch pipe 621 when the mud in the excavation chamber 11O drops to the first branch pipe 621, thereby preventing the mud in the excavation chamber 11O from being pressed down, resulting in the mud level in the excavation chamber 110 being unable to drop further.

[0054] In some embodiments, the connecting pipe 600 includes a first connecting piece 620 . The first connecting piece 620 includes a first branch pipe 621 and a first branch valve 622 . The first branch valve 622 is used to control the flow rate of the fluid passing through the first branch pipe 621 .

[0055] 2 , in some embodiments, the connecting pipe 600 further includes a second branch pipe 611 , and the second branch pipe 621 is located below the second fixed liquid level gauge.

[0056] In this embodiment, the second branch pipe 621 is located below the second fixed liquid level gauge, so that when the mud level in the excavation chamber 110 drops to the second preset height, the mud in the excavation chamber 110 can flow into the air cushion chamber 120 through the second branch pipe 621, and then flow out from the slurry discharge pipe 410, thereby avoiding the accumulation of stones at the bottom of the excavation chamber 110, which causes the passage between the excavation chamber 110 and the air cushion chamber 120 to be blocked, resulting in the mud in the excavation chamber 110 being unable to flow out of the slurry discharge pipe 410 and the liquid level being unable to drop to the second preset height.

[0057] In some embodiments, the connecting pipe 600 includes a second connecting piece 610 . The second connecting piece 610 includes a second branch pipe 611 and a second branch valve 612 . The second branch valve 612 is used to control the flow rate of the fluid passing through the second branch pipe 611 .

[0058] 2 , in some embodiments, the slurry feed assembly 700 includes a first slurry feed pipe 710 and a second slurry feed pipe 720 . The slurry outlet of the first slurry feed pipe 710 is connected to the air cushion chamber 120 , and the slurry outlet of the second slurry feed pipe 720 is connected to the excavation chamber 110 .

[0059] In this embodiment, slurry is injected into the air cushion chamber 120 and the excavation chamber 110 respectively through the first slurry inlet pipe 710 and the second slurry inlet pipe 720, so that the chamber body 100 is quickly filled with slurry.

[0060] 2 , in some embodiments, a discharge pipe 910 is provided on the top of the first pressure maintaining assembly 810 , and one end of the discharge pipe 910 is connected to the top of the excavation chamber 110 for discharging air in the excavation chamber 110 .

[0061] In this embodiment, the second pressure maintaining component 820 injects gas into the air cushion chamber 120 to press the mud in the air cushion chamber 120 into the excavation chamber 110. The mud level in the excavation chamber 110 rises, and the gas in the excavation chamber 110 is discharged through the discharge pipe 910 until the excavation chamber 110 is filled with mud.

[0062] In some embodiments, a discharge assembly 900 is provided on the top of the first pressure maintaining assembly 810 . The discharge assembly includes a discharge pipe 910 and a discharge valve 920 . The discharge valve 920 is used to control the flow rate of the fluid passing through the discharge pipe 910 .

[0063] 2 , in some embodiments, a cutterhead slurry inlet pipe 500 is included, and the cutterhead slurry inlet pipe 500 is used to transmit slurry to flush the cutterhead 300 .

[0064] In this embodiment, when the cutter head 300 excavates the soil layer, the cutter head slurry inlet pipe 500 transmits slurry to clean the cutter head 300, so as to flush away the mud cake on the cutter head 300.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A slurry shield machine, characterized in that: The slurry shield machine comprises: A bin body (100) comprises an excavation bin (110) and an air cushion bin (120) arranged at intervals and connected to each other, wherein an opening is provided on a side of the excavation bin (110) facing away from the air cushion bin (120); a cutter disc (300), the cutter disc (300) being rotatably disposed on an opening side of the excavation chamber (110); A slurry feeding assembly (700) is configured to fill the silo (100) with slurry; A slurry discharge assembly (400), wherein a slurry discharge pipe (410) of the slurry discharge assembly (400) is connected to the bin body (100); The pressure-maintaining device (800) comprises a first pressure-maintaining component (810), wherein the first pressure-maintaining component (810) is used to inject or discharge gas into the excavation chamber (110), and the first pressure-maintaining component (810) is configured to inject gas into the excavation chamber (110) filled with mud, so that the mud in the excavation chamber (110) is discharged through the mud discharge pipe (410), thereby reducing the mud level in the excavation chamber (110).

2. The slurry shield machine according to claim 1, characterized in that: The slurry inlet assembly (700) is configured to fill mud into a portion of the space inside the bin body (100), and the pressure maintaining device (800) includes a second pressure maintaining assembly (820), and the second pressure maintaining assembly (820) is configured to inject gas into the air cushion bin (120) to press the mud in the air cushion bin (120) into the excavation bin (110), so that the excavation bin (110) is filled with mud.

3. The slurry shield machine according to claim 1, characterized in that: The excavation chamber (110) further comprises a controller, wherein a laser level meter (210) is arranged in the excavation chamber (110), and the laser level meter (210), the first pressure-maintaining component (810) and the slurry discharge pipe (410) are all communicatively connected to the controller, and the laser level meter (210) is used to measure the slurry level. When the slurry level in the excavation chamber (110) drops to a preset height, the controller can close the first pressure-maintaining component (810) and the slurry discharge pipe (410).

4. The slurry shield machine according to claim 3, characterized in that: It also includes a first fixed liquid level meter (220), which is communicatively connected to the controller, and the preset height includes a first preset height. The first fixed liquid level meter (220) is located at the first preset height in the excavation bin (110), and the first preset height is located below the laser liquid level meter (210). When the mud level in the excavation bin (110) drops to the first fixed liquid level meter (220), the controller can close the first pressure maintaining component (810) and the slurry discharge pipe (410).

5. The slurry shield machine according to claim 4, characterized in that: It also includes a second fixed liquid level gauge, which is communicatively connected to the controller, and the preset height includes a second preset height. The second fixed liquid level gauge is located at the second preset height in the excavation bin (110), and the second preset height is located below the first preset height. When the mud level in the excavation bin (110) drops to the second fixed liquid level gauge, the controller can close the first pressure maintaining component (810) and the slurry discharge pipe (410), and when one of the first fixed liquid level gauge (220) and the second fixed liquid level gauge is started, the other is closed.

6. The slurry shield machine according to claim 5, characterized in that: It comprises a connecting pipe (600), wherein the connecting pipe (600) is located below the first fixed liquid level meter (220), one end of which is connected to the excavation chamber (110) and the other end of which is connected to the air cushion chamber (120).

7. The slurry shield machine according to claim 6, characterized in that: The connecting pipe (600) comprises a first branch pipe (621), wherein the first branch pipe (621) is located between the first fixed liquid level meter (220) and the second fixed liquid level meter; when the first fixed liquid level meter (220) is working, the first branch pipe (621) is connected; when the second fixed liquid level meter is working, the first branch pipe (621) is closed.

8. The slurry shield machine according to claim 7, characterized in that: The connecting pipe (600) further comprises a second branch pipe (611), and the second branch pipe (621) is located below the second fixed liquid level meter.

9. The slurry shield machine according to claim 1, characterized in that: The slurry inlet assembly (700) comprises a first slurry inlet pipe (710) and a second slurry inlet pipe (720); the slurry outlet of the first slurry inlet pipe (710) is connected to the air cushion chamber (120), and the slurry outlet of the second slurry inlet pipe (720) is connected to the excavation chamber (110).

10. The slurry shield machine according to claim 2, characterized in that: A discharge pipe (910) is provided at the top of the first pressure-maintaining component (810), and one end of the discharge pipe (910) is connected to the top of the excavation chamber (110) so as to discharge the air in the excavation chamber (110).

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