Heading machine

Abstract

The utility model provides a heading machine. The heading machine comprises a cutterhead and a soil bin, wherein the soil bin is arranged between the cutterhead and a deslagging mechanism; the deslagging mechanism is matched with the soil bin; wherein a grinding part is arranged in the soil bin, and one part of the grinding part rotates relative to the other part of the grinding part so as to be used for grinding tunneling products entering the soil bin from one side of the cutter head. When the heading machine disclosed by the utility model works, the cutterhead rotates, so that the cutters on the cutterhead are driven to extrude and cut rocks in the rotating process, and the rocks are crushed. And the crushed tunneling product is discharged into a soil bin. And the grinding part can grind large-size soil blocks, mud blocks, sand stones and concrete in tunneling products entering the soil bin in the rotating process, so that the situation that the large-size soil blocks, the mud blocks, the sand stones and the concrete cause blockage or blockage of the deslagging mechanism is avoided. Therefore, the heading machine disclosed by the utility model can discharge heading products more easily and smoothly in the working process.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and more specifically, to a tunneling machine. Background Technology

[0002] A tunnel boring machine (TBM) is a heavy-duty machine used for tunnel excavation and underground engineering construction, primarily in mining, subway, water conservancy, and transportation sectors. It efficiently breaks up excavated materials such as rock and soil and transports the debris away, thus enabling rapid tunneling.

[0003] The main components of a tunneling machine include: a cutterhead, a muck removal system, a propulsion system, a drive system, and a control system. The propulsion system provides thrust, propelling the tunneling machine forward. During the tunneling machine's advance, the cutterhead, equipped with cutting tools, breaks up rock or soil. The excavated soil, mud, gravel, and concrete are discharged through the muck removal system. The muck removal system includes a muck chamber and a muck discharge mechanism connected to or linked to it. A shortcoming of existing technology is that the excavated material entering the muck chamber often contains excessively large clods of soil, mud, rocks, and concrete, causing blockages or jamming of the muck discharge mechanism.

[0004] In particular, for certain specific tunneling scenarios, small to medium-sized tunnel boring machines (TBMs) are required. The advantages of small TBMs are: small turning radius, flexible operation, and the ability to make sharp turns. Therefore, they can replace towing pipes and be used in various excavation scenarios with small turning radii. Small TBMs are compact in size, with a diameter generally between 2 and 4.2 meters. However, due to size and space limitations, the design of their muck removal mechanism is more intricate, making it easier for the excavated material entering the soil chamber to clog or jam the muck removal mechanism. Utility Model Content

[0005] Therefore, this utility model provides a tunneling machine to solve the technical problems of easy clogging, jamming and poor flow of the slag discharge mechanism of the tunneling machine in the prior art.

[0006] To solve the above problems, this utility model provides a tunneling machine, which includes: a cutterhead, a soil chamber, the soil chamber being disposed between the cutterhead and a muck removal mechanism; a muck removal mechanism cooperating with the soil chamber; wherein, a grinding section is provided inside the soil chamber, a part of the grinding section rotating relative to another part, for grinding the tunneling products entering the soil chamber from one side of the cutterhead.

[0007] In any of the above technical solutions, the grinding section includes: a first grinding section that rotates around the axis of the soil chamber; and a second grinding section that is fixed inside the soil chamber; wherein there is a grinding gap between the first grinding section and the second grinding section.

[0008] In any of the above technical solutions, the first grinding section is connected to the cutter head, and the second grinding section is connected to the soil chamber.

[0009] In any of the above technical solutions, the end of the soil chamber near the cutterhead is formed as the inlet end, and the end of the soil chamber near the slag discharge mechanism is formed as the outlet end. The first grinding section and the second grinding section both show a tendency to gradually deflect and converge towards the axis of the soil chamber from the side near the inlet end to the side near the outlet end, so as to respectively surround and define at least part of the conical structure.

[0010] In any of the above technical solutions, the tapers of the first grinding section and the second grinding section are different.

[0011] In any of the above technical solutions, a first grinding gap is provided between the first grinding section and the second grinding section on the side near the inlet end; a second grinding gap is provided between the first grinding section and the second grinding section on the side near the outlet end; the first grinding gap is larger than the second grinding gap.

[0012] In any of the above technical solutions, the second grinding section divides the soil chamber into a first space connected to the cutterhead and a second space connected to the slag discharge mechanism, with the grinding section located in the first space.

[0013] In any of the above technical solutions, the first grinding section is formed as two or more grinding elements arranged at intervals.

[0014] In any of the above technical solutions, the number of grinding elements is an even number, and the grinding elements are arranged symmetrically around the axis of the soil chamber; and / or the number of grinding elements is 4 to 8.

[0015] In any of the above technical solutions, the grinding gap between at least one grinding element and the second grinding section is different from the grinding gap between at least another grinding element and the second grinding section; or the grinding gap between each grinding element and the second grinding section is different and gradually changes around the axis of the soil chamber.

[0016] In any of the above technical solutions, the slag discharge mechanism includes a pipeline connected to the soil silo; or the slag discharge mechanism includes a shaftless screw conveyor connected to the soil silo; or the slag discharge mechanism includes a shafted screw conveyor connected to the soil silo.

[0017] Beneficial effects

[0018] The tunneling machine of this invention includes a cutterhead, a soil chamber, and a muck removal mechanism. The soil chamber is located between the cutterhead and the muck removal mechanism, which works in conjunction with the soil chamber. The tunneling machine of this invention also includes a grinding section within the soil chamber. Because the grinding section can grind larger clods of soil and gravel in the excavated material entering the soil chamber during its relative rotation, it can prevent the muck removal mechanism from clogging or getting stuck. In summary, the tunneling machine of this invention can more easily and smoothly discharge the excavated material during operation. Attached Figure Description

[0019] Figure 1 One of the structural schematic diagrams of the front end of the tunneling machine of this utility model is shown;

[0020] Figure 2 This is the second schematic diagram showing the structure of the front end of the tunneling machine of this utility model;

[0021] Figure 3 The third schematic diagram of the front end of the tunneling machine of this utility model is shown;

[0022] Figure 4 A schematic diagram showing the arrangement of the first and second grinding sections in the tunneling machine of this utility model is provided (view from the inside of the soil chamber towards the soil chamber).

[0023] Figure 5 A schematic diagram showing the arrangement of the first grinding section in the tunneling machine of this utility model is provided (view from the inside of the soil chamber towards the cutterhead).

[0024] Explanation of reference numerals in the attached figures:

[0025] Cutterhead: 100; Soil chamber: 200; Inlet end: 200a; Outlet end: 200b; First grinding section: 210; Grinding component: 211; Second grinding section: 220; Water outlet: 221; First space: 230; Second space: 240; Pipeline: 310; Shaftless screw conveyor: 320; Shaftless screw conveyor: 330; First grinding gap: L1; Second grinding gap: L2. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This utility model provides a tunnel boring machine (TBM). TBMs can be used for excavating underground engineering projects such as tunnels and roadways, and have wide applications in transportation tunnels, water conservancy projects, mining, and municipal engineering. The technical solution of this utility model can be applied to full-face tunnel boring machines for long-distance, large-diameter tunnel excavation, as well as partial-face tunnel boring machines for mining roadways and small tunnels. It can also be applied to shield tunneling machines operating in soft soil, sand layers, and other geological conditions, and to pipe jacking machines used in underground pipeline and cable tunnel laying. In particular, the technical solution of this utility model is especially suitable for small and medium-sized shield tunneling machines (hereinafter referred to as "small shield tunneling machines," which refer to shield tunneling machines with a diameter between 2 meters and 4.2 meters).

[0028] In existing technology, the cutterhead of a tunnel boring machine (TBM) rotates to break up rocks or soil in a tunnel. The soil, sand, gravel, concrete, and other materials excavated by the cutterhead mix to form the excavated products to be discharged. Depending on the construction environment and equipment, these excavated products may be solid debris, colloidal mud, or a mixture of solid and liquid. These excavated products enter a muck chamber, which, in conjunction with a muck removal mechanism, discharges the excavated products from the TBM.

[0029] The shortcoming of the existing technology is that the excavated products entering the soil chamber are often mixed with excessively large clods of soil, mud, stones and concrete, which can cause blockage or jamming of the slag removal mechanism.

[0030] To solve the above-mentioned technical problems, the technical solution of this utility model has improved the excavation and slag removal structure located at the front end of the tunneling machine.

[0031] like Figures 1 to 3 As shown, the tunneling machine of this utility model includes: a cutterhead 100, a soil chamber 200, and a muck removal mechanism. The soil chamber 200 is located between the cutterhead 100 and the muck removal mechanism. The muck removal mechanism cooperates with the soil chamber 200.

[0032] The cutting tools of a tunneling machine break up rocks and soil through contact with them. The cutterhead 100 serves as the carrier for these cutting tools. Specifically, when the tunneling machine is working, a drive device, such as an electric motor, transmits torque to the cutterhead, causing it to rotate. This rotation drives the cutting tools on the cutterhead to squeeze and cut the rock, breaking it apart.

[0033] The broken rocks, sand, soil, and concrete are discharged into the soil chamber 200. Specifically, during the tunneling process, the cutterhead continuously rotates and cuts the rock or soil, and the resulting excavated material is collected in the soil chamber 200, thus preventing it from directly scattering onto the tunneling face and affecting tunneling efficiency and safety. Furthermore, the soil chamber 200 maintains a certain earth pressure, balancing it with the water and soil pressure at the excavation face, thereby reducing disturbance to the ground and controlling surface subsidence. This pressure balancing mechanism is a crucial guarantee for the efficient and safe operation of the tunneling machine.

[0034] The soil chamber 200 needs to be coordinated with the muck removal system. Specifically, the muck removal system includes a muck removal mechanism that is connected to or linked to the soil chamber 200 to discharge the excavated products containing gravel, soil, and concrete from the soil chamber 200, thereby maintaining the smooth flow of the tunnel and the normal operation of the tunnel boring machine.

[0035] It is understandable that the excavated material from the cutterhead 100 and fed into the soil chamber 200 may be solid excavated material such as excavated soil and gravel; it may also be silt or thick mud mixed with gravel, sand, mud, and water, and its state may be a solid-liquid mixture or a near-colloidal excavated material. Depending on the type of tunneling machine and the tunneling construction scenario, the state of the excavated material varies, requiring different excavation removal mechanisms. For example, depending on the construction environment and equipment, the excavation removal system may specifically be a pipeline for extracting liquids or solid-liquid mixtures, or a conveyor or conveyor belt for transporting solids.

[0036] like Figure 1 As shown, in one example of the present invention, the slag removal mechanism includes a pipe 310, which is connected to the soil chamber 200. The implementation of slag removal via pipe 310 is particularly suitable for discharging solid-liquid mixed tunneling products. These solid-liquid mixed tunneling products contain not only soil clods, mud clods, rocks, concrete, and water, but may also contain soil amendments such as foaming agents and bentonite, as well as other solid or liquid tunneling products. Pipe 310 removes the tunneling products by pumping out slurry or muddy water. This method is particularly suitable for slurry-balanced tunneling machines.

[0037] like Figure 2 As shown, in another example of the present invention, the slag discharge mechanism includes a shaftless screw conveyor 320, which is connected and cooperates with the soil bin 200. Figure 3 As shown, in another example of the present invention, the slag discharge mechanism includes a shafted screw conveyor 330, which is connected and cooperates with the soil bin 200.

[0038] It is understandable that screw conveyors are well-suited for transporting solid or near-gelatinous tunneling products. Screw conveyors, through structures such as augers, continuously transport the tunneling products to the outside of the tunneling machine. This method is particularly suitable for earth pressure balance tunneling machines to discharge the tunneling products.

[0039] Because the shaftless screw conveyor 320 does not have a space-consuming shaft at its center, its structure is relatively compact, making it more suitable for small tunnel boring machines (TBMs) and for transporting thick mud and debris. The shafted screw conveyor 330, with its internal shaft, has a stronger and more stable conveying capacity, making it suitable for medium and large TBMs and for transporting rocks and mud. In one embodiment of this invention, at least a portion of the slag discharge mechanism is inclined relative to the horizontal plane. It is understood that for screw conveyors, if at least a portion of the slag discharge mechanism is inclined relative to the horizontal plane, it facilitates the efficient transport and discharge of excavated materials. In another embodiment of this invention, at least a portion of the slag discharge mechanism is substantially parallel to the horizontal plane. It is understood that for pipelines, it is possible to choose to maintain a substantially parallel position to the horizontal plane.

[0040] The disposal of tunneling products depends on the specific tunneling machine and project requirements, but generally falls into the following categories: Tunneling products can be directly transported to the surface for processing via conveyor belts or pipelines. This method is suitable for projects with sufficient surface space and processing capacity. In some projects, to reduce impact on the surface or meet specific environmental protection requirements, tunneling products may be processed underground. For certain special types of tunneling machines, tunneling products can also be recycled.

[0041] In summary, ensuring the smooth operation of the tunneling machine's muck removal system is crucial for protecting the machine and improving tunneling efficiency.

[0042] The main reason for the slag removal system's malfunction is that the slag removal mechanism is easily blocked or jammed by large pieces of gravel, hard mud, soil, or concrete. Therefore, to ensure the slag removal system's smooth operation and prevent blockage or jamming of the slag removal mechanism, this invention incorporates a grinding section inside the soil chamber 200. A portion of the grinding section rotates relative to another portion to grind the excavated material entering the soil chamber 200 from one side of the cutterhead 100.

[0043] It is understandable that the function of the grinding section is to grind the crushed stone, hard mud, soil, or concrete entering the soil chamber 200, in order to reduce its volume and prevent it from clogging or jamming the slag discharge mechanism. Accordingly, the grinding section needs to be made of a relatively hard and coarse material, such as an alloy material.

[0044] The specific structure and materials used in the grinding section can be adjusted according to the type of tunneling machine and the construction environment. Generally speaking, the grinding section needs to have a grinding surface with a certain degree of roughness or texture to ensure full contact with the tunneling product during the grinding process and improve grinding efficiency.

[0045] like Figure 2 As shown, the grinding section includes: a first grinding section 210, which rotates around the axis of the soil chamber 200; and a second grinding section 220, which is fixed inside the soil chamber 200; wherein a grinding gap exists between the first grinding section 210 and the second grinding section 220. The first grinding section 210 and the second grinding section 220 can be connected and fixed by bolts, welding, or other fixing methods to ensure their stability and reliability during the grinding process.

[0046] Preferably, the first grinding part 210 and the second grinding part 220 can be designed to be detachably connected and fixed so as to replace and maintain the first grinding part 210 and the second grinding part 220.

[0047] For example, the first grinding section 210 and the second grinding section 220 may be made of alloy materials. Considering the requirements for wear resistance and corrosion resistance of the first grinding section 210 and the second grinding section 220, a protective coating may also be applied to the surface of the first grinding section 210 and the second grinding section 220 by means of spraying, brushing, chemical vapor deposition, etc.

[0048] The first grinding section 210 needs to rotate to continuously agitate and grind the excavated product, ensuring full contact with the crushed stone, sand, mud, and concrete to be ground. To achieve the above objective, in one embodiment of this invention, such as... Figure 1 As shown, the first grinding part 210 can be connected and fixed to the cutter head 100 so that it rotates synchronously with the cutter head 100. In another embodiment of this utility model, an independent driving component can be provided for the first grinding part 210, so that the first grinding part 210 can rotate independently inside the soil chamber 200. Its rotation direction can be the same as or opposite to that of the cutter head 100, and its rotation speed can be the same as or different from that of the cutter head 100.

[0049] It is understandable that connecting and fixing the first grinding unit 210 to the cutter head 100 so that the two rotate synchronously is simpler in structure, easier to control, and relatively cheaper. Only one end of the first grinding unit 210 needs to be fixedly connected to the periphery of the cutter head 100. While providing an independent rotation drive component for the first grinding unit 210 is more complex and more expensive, it allows for control of the rotation direction and speed of the first grinding unit 210 according to different grinding requirements. In particular, for excavation environments with hard soil or large clods in the underground environment, the rotation direction of the first grinding unit 210 can be set opposite to the rotation direction of the cutter head 100 to achieve more thorough grinding.

[0050] In summary, since the first grinding section 210 can cooperate with the second grinding section 220 during rotation to grind larger clods of soil, gravel, and concrete in the excavated products entering the soil chamber 200, it can prevent the excavated products from causing blockage or jamming of the slag discharge mechanism. As a result, the tunneling machine of this utility model can discharge the excavated products more easily and smoothly during operation.

[0051] Regarding the location of the first grinding section 210 in this utility model, it can be arranged inside the soil chamber 200 along the radial direction of the soil chamber 200 and around the axis of the soil chamber 200.

[0052] Preferably, such as Figure 4 As shown, the end of the soil chamber 200 near the cutterhead 100 is formed as the inlet end 200a, and the end of the soil chamber 200 near the slag discharge mechanism is formed as the outlet end 200b. Both the first grinding section 210 and the second grinding section 220 exhibit a tendency to gradually converge towards the axis of the soil chamber 200 from the side near the inlet end 200a towards the side near the outlet end 200b, thus respectively enclosing and defining at least a portion of the conical structure. It can be understood that the inlet end 200a is an open structure to collect the rock and soil broken by the cutter. The outlet end 200b is a closed structure and communicates with the external space only through the slag discharge mechanism to prevent the tunneling products from entering other parts of the tunneling machine. The first grinding section 210 can rotate and agitate the tunneling products after the slurry enters the soil chamber 200, separating larger gravel, mud, and concrete through centrifugal force, and ensuring that the tunneling products are in full contact with both the first grinding section 210 and the second grinding section 220, achieving efficient grinding.

[0053] The axis of earth storage 200 is shown in Figure 1It can be understood that the axis of the soil chamber 200 coincides with the rotation axis of the cutter head 100. By setting the first grinding section 210 and the second grinding section 220 to gradually deflect and contract towards the axis of the soil chamber 200 in the direction extending from the inlet end 200a to the outlet end 200b, large pieces of gravel and soil separated under centrifugal force can be gathered at a position away from the slag discharge mechanism, avoiding accumulation and blockage of the slag discharge mechanism inlet.

[0054] In one example of this utility model, the first grinding section 210 can be formed as a cone arranged around the axis of the soil chamber 200. The first grinding section 210 formed as a cone can increase the contact area with the excavated product so as to fully screen out large pieces of gravel and soil and grind them repeatedly.

[0055] like Figure 2 and Figure 3 As shown, in another example of this utility model, the first grinding section 210 is formed as a plurality of grinding elements 211 arranged at intervals. Figure 2 As shown, the number of grinding elements 211 is preferably 4 to 8. The multiple grinding elements 211 arranged at intervals not only achieve the grinding function but also sweep away large pieces of gravel and soil, preventing their accumulation at the inlet of the slag discharge mechanism. The grinding elements 211 are preferably strip-shaped.

[0056] In addition to cooperating with the first grinding section 210 to achieve grinding, the second grinding section 220 also serves to protect the slag discharge mechanism and prevent crushed stone and uncrushed soil from entering the slag discharge mechanism.

[0057] The second grinding section 220 is inclined within the soil chamber 200 to shield the slag discharge mechanism. Thus, the second grinding section 220 divides the soil chamber 200 into a first space 230 communicating with the cutterhead 100 and a second space 240 communicating with the slag discharge mechanism. Specifically, the first grinding section 210 is located in the first space 230, so that the gravel and soil clods in the excavated product are ground to the required sieve size before passing through the second grinding section 220 and entering the second space 240. The second grinding section 220 is provided with a water inlet 221. Preferably, the second grinding section 220 is made of wear-resistant steel plate, and can be made of hard alloy material. Specifically, the second grinding section 220 can be plate-shaped or strip-shaped.

[0058] like Figure 2 As shown, the second grinding section 220 and the first grinding section 210 can be configured to be separate from each other, so that there is a grinding gap between the second grinding section 220 and the first grinding section 210.

[0059] The width of the gap can be selected and adjusted by those skilled in the art according to actual needs. The purpose of setting the gap is to prevent excessively large stones and clods of soil from entering between the second grinding section 220 and the first grinding section 210. Taking an embodiment where the first grinding section 210 is formed as a plurality of grinding elements 211 arranged at intervals as an example, there is a gap between each grinding element 211 and the second grinding section 220. Assuming the gap distance is 10cm, stones and clods of soil with a diameter greater than 10cm cannot enter between the second grinding section 220 and the first grinding section 210, thereby preventing the second grinding section 220 from being damaged by the impact of large stones and clods of soil, and also preventing large stones and clods of soil from blocking the second grinding section 220. In addition, stones and clods of medium size can enter between the second grinding section 220 and the first grinding section 210 and be further and more thoroughly ground. For example, the second grinding part 220, which is made of hard alloy, is not only more robust and less prone to damage, but can also work with the first grinding part 210 to grind gravel and soil.

[0060] Preferably, the first grinding section 210 and the second grinding section 220 have different tapers. On the side near the inlet end 200a, there is a first grinding gap L1 between the first grinding section 210 and the second grinding section 220; on the side near the outlet end 200b, there is a second grinding gap L2 between the first grinding section 210 and the second grinding section 220; the first grinding gap L1 is larger than the second grinding gap L2. This design allows excessively large stones and clods to remain near the cutter head 100, preventing them from approaching the slag discharge mechanism. Furthermore, the taper difference allows for simultaneous grinding of stones and clods of different sizes. Relatively large stones and clods are ground near the cutter head 100 with a wider gap, while relatively small stones and clods are ground away from the cutter head 100 with a narrower gap.

[0061] like Figure 4 and Figure 5 As shown, the first grinding section 210 can be formed as two or more grinding elements 211 arranged at intervals. Preferably, the number of grinding elements 211 is even, and the grinding elements 211 are symmetrically arranged around the axis of the soil chamber 200. The even number of grinding elements 211 can cooperate with the second grinding section 220 to uniformly grind the tunneling product and keep the grinding elements 211 stable during rotation. Too many grinding elements 211 increase the design difficulty and manufacturing cost of the tunneling machine, while too few grinding elements 211 cannot fully achieve the grinding effect. More preferably, the number of grinding elements 211 is 4 to 8.

[0062] For example, when the first grinding section 210 is formed as a plurality of grinding elements 211 arranged at intervals, the grinding gap between any at least one grinding element 211 and the second grinding section 220 is different from the grinding gap between any other at least one grinding element 211 and the second grinding section 220.

[0063] Taking the case of four grinding parts 211 as an example, the grinding parts 211 are numbered sequentially along the circumference of the axis of the soil chamber 200. Grinding parts 211 1 and 2 can be set to have the same taper, grinding parts 211 3 and 4 can be set to have the same taper, and the taper of grinding parts 211 3 and 4 can be greater than the taper of grinding parts 211 1 and 2.

[0064] For example, when the first grinding section 210 is formed as a plurality of grinding elements 211 arranged at intervals, the grinding gap between each grinding element 211 and the second grinding section 220 is different and gradually changes around the axis of the soil chamber 200.

[0065] Taking the case of four grinding parts 211 as an example, the grinding parts 211 are numbered sequentially along the circumference of the axis of the soil chamber 200. The taper of the four grinding parts 211, numbered 1, 2, 3, and 4, can be set to increase sequentially.

[0066] The above-described settings for the taper and gap of the grinding section allow for the gradual grinding of gravel and soil clods, ensuring grinding effectiveness and improving grinding efficiency.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tunneling machine, characterized in that, The tunneling machine includes: Cutter head (100), A soil bin (200) is disposed between the cutter head (100) and the slag discharge mechanism; The slag discharge mechanism is used in conjunction with the soil chamber (200); The earth chamber (200) is equipped with a grinding section, a part of which rotates relative to another part to grind the excavation products that enter the earth chamber (200) from one side of the cutterhead (100).

2. The tunneling machine according to claim 1, characterized in that, The grinding section includes: The first grinding section (210) rotates about the axis of the soil chamber (200); The second grinding section (220) is fixed inside the soil chamber (200); There is a grinding gap between the first grinding section (210) and the second grinding section (220).

3. The tunneling machine according to claim 2, characterized in that, The first grinding section (210) is connected to the cutter head (100), and the second grinding section (220) is connected to the soil chamber (200).

4. The tunneling machine according to claim 2, characterized in that, The soil chamber (200) is formed as an inlet end (200a) at the end near the cutter head (100), and as an outlet end (200b) at the end near the slag discharge mechanism. The first grinding section (210) and the second grinding section (220) both tend to deflect and converge towards the axis of the soil chamber (200) from the side near the inlet end (200a) to the side near the outlet end (200b), so as to respectively surround and define at least part of the conical structure.

5. The tunneling machine according to claim 4, characterized in that, The first grinding section (210) and the second grinding section (220) have different tapers.

6. The tunneling machine according to claim 4, characterized in that, On the side near the inlet end (200a), there is a first grinding gap (L1) between the first grinding section (210) and the second grinding section (220); On the side near the outlet end (200b), there is a second grinding gap (L2) between the first grinding section (210) and the second grinding section (220); The first grinding gap (L1) is larger than the second grinding gap (L2).

7. The tunneling machine according to any one of claims 1 to 6, characterized in that, The second grinding section (220) divides the soil chamber (200) into a first space (230) communicating with the cutter head (100) and a second space (240) communicating with the slag discharge mechanism, and the grinding section (210) is located in the first space (230).

8. The tunneling machine according to any one of claims 1 to 6, characterized in that, The first grinding section (210) is formed as two or more grinding elements (211) arranged at intervals.

9. The tunneling machine according to claim 8, characterized in that, The number of the grinding elements (211) is even, and the grinding elements (211) are arranged symmetrically around the axis of the soil chamber (200); and / or The number of the grinding parts (211) is 4 to 8.

10. The tunneling machine according to claim 8, characterized in that, The grinding gap between any at least one of the grinding elements (211) and the second grinding section (220) is different from the grinding gap between any other at least one of the grinding elements (211) and the second grinding section (220); or The grinding gaps between each of the grinding elements (211) and the second grinding section (220) are different and gradually change around the axis of the soil chamber (200).

11. The tunneling machine according to any one of claims 1 to 6, characterized in that, The slag discharge mechanism includes a pipe (310), which is connected to the soil chamber (200); or The slag discharge mechanism includes a shaftless screw conveyor (320), which is connected to the soil bin (200); or The slag discharge mechanism includes a shafted screw conveyor (330), which is connected to the soil silo (200).

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