A slag chute for inclined shaft TBM

Abstract

The present invention relates to a slag chute for inclined shaft TBM. The slag chute for inclined shaft TBM comprises: a bottom plate extending in the front-rear direction; two side plates, which are arranged on the left and right sides of the bottom plate; and an arc segment between the bottom plate and the corresponding side plate, the arc segment being integrally bent and formed on one of the bottom plate and the side plate, and the other of the bottom plate and the side plate being welded and connected to the arc segment. By changing the integral forming of the side plate and the bottom plate to a welded connection, before the side plate and the bottom plate are welded, it is relatively convenient to bend an arc segment with a larger curvature on the side plate or the bottom plate through a bending device, so as to facilitate the slag to flow down, so that the slag is not easily accumulated at the arc segment, and the slag discharge efficiency is improved.

Description

Technical Field

[0001] The invention relates to a slag chute for inclined shaft TBM. Background Art

[0002] TBM hard rock tunnel boring machine is a special engineering machinery for tunnel excavation. It has the functions of excavating and cutting soil, conveying mud and slag, assembling tunnel lining, etc. It has been widely used in tunnel projects such as subway, railway, highway, municipal engineering, hydropower, etc. Conventional TBM tunnel boring machine is suitable for flat tunnel construction with a slope of ±5%, while TBM tunnel boring machine with a large slope can solve the excavation problem of inclined tunnels with a large slope.

[0003] A Chinese patent document with application publication number CN112412478A discloses a tunnel inclined shaft construction system, including a self-sliding slag discharge device, which includes a U-shaped slag chute, the U-shaped slag chute includes a bottom plate and side plates, and the upper parts of the two side plates are detachably connected with a cover body, and the U-shaped slag chute and the cover body form a sealed cavity for the slag to flow down.

[0004] Since the U-shaped slag chute is integrally formed, the connection between the side plate and the bottom plate is not easy to bend into an arc, which makes it easy for slag to accumulate at the connection between the side plate and the bottom plate, affecting slag discharge. Summary of the invention

[0005] The object of the present invention is to provide a slag chute for inclined shaft TBM, so as to solve the technical problem that the U-shaped slag chute in the prior art is integrally processed and formed, resulting in that the connection position between the side plate and the bottom plate is not easy to bend into an arc.

[0006] To achieve the above-mentioned purpose, the technical solution of the slag chute for inclined shaft TBM of the present invention is:

[0007] Slag chute for inclined shaft TBM, including:

[0008] a bottom plate extending in the front-rear direction;

[0009] Two side panels are provided, and the two side panels are arranged on the left and right sides of the bottom plate;

[0010] Also includes:

[0011] The arc segment is located between the bottom plate and the corresponding side plate. The arc segment is integrally bent and formed on one of the bottom plate and the side plate. The other of the bottom plate and the side plate is welded and connected to the arc segment.

[0012] The beneficial effect is: by changing the one-piece forming of the side panel and the bottom panel to a welding connection, before the side panel and the bottom panel are welded, it is relatively convenient to use a bending device to bend a circular arc section with a larger curvature on the side panel or the bottom panel, so as to facilitate the slag to slide down, making it difficult for the slag to accumulate at the circular arc section, thereby improving the slag discharge efficiency.

[0013] As a further improvement, a wear-resistant layer is provided on the inner side of the bottom plate.

[0014] The beneficial effect is that the wear-resistant layer can improve the wear resistance of the bottom plate, thereby reducing the number of times the slag chute needs to be replaced.

[0015] As a further improvement, the wear-resistant layer contains 15%-20% Ni powder, 20%-29% WC powder, 5%-10% Co powder, 2%-5% diamond powder, and the remainder is Fe powder.

[0016] The beneficial effect is: a certain amount of diamond powder is added to existing conventional wear-resistant powders such as Ni and WC to improve wear resistance; a high content of diamond powder is not easy to clad, and selecting the content of diamond powder to be 2%-5% can better meet the cladding area and cladding thickness of the wear-resistant layer on the base plate.

[0017] As a further improvement, the surface of the diamond powder has a metal coating.

[0018] The beneficial effect is that because diamond powder is easy to carbonize at high temperature, after plating, the high temperature first acts on the metal plating, delaying the transfer to the diamond to protect the diamond powder. The difference is the different plating thickness selected, which is related to the content of diamond powder and welding temperature.

[0019] As a further improvement, the thickness of the metal coating is 0.2-0.25 um.

[0020] The beneficial effect is: according to the process characteristics of 2%-5% diamond powder and 1050-1100℃ welding temperature, when the thickness of the metal coating is designed to be 0.2-0.25um, the temperature of the diamond powder surface during welding can be effectively controlled not to exceed 700℃, thereby ensuring the performance of the diamond powder.

[0021] As a further improvement, the particle size of the Ni powder is 20-60 mesh, and the particle size of the WC powder is 60-100 mesh.

[0022] The beneficial effect is: since the wear resistance of coarse-grained powder is generally higher than that of fine-grained powder, and WC powder is more wear-resistant than Ni powder, in order to match the wear resistance of Ni powder and WC powder so as to work together, fine-grained WC powder and coarse-grained Ni powder are selected; in addition, the particle sizes of Ni powder and WC powder are different, which makes it easier for fine-grained WC powder to be evenly distributed in coarse-grained Ni powder.

[0023] As a further improvement, the wear-resistant layer has a thickness of 1-3 mm.

[0024] The beneficial effect is: a large thickness of the wear-resistant layer will lead to complicated welding process, while a small thickness of the wear-resistant layer will not meet the use distance requirements. Therefore, considering the difficulty of cladding welding and the excavation mileage of the inclined shaft, the thickness of the wear-resistant layer is designed to be 1-3mm, which meets the excavation mileage of the inclined shaft and the welding difficulty is relatively small.

[0025] As a further improvement, the wear-resistant layer is formed on the inner side of the bottom plate by laser or plasma cladding.

[0026] The beneficial effect is that such a design can improve the wear resistance and stability of the bottom plate, facilitate long-distance use, and reduce the number of replacement times of the slag chute.

[0027] As a further improvement, the radius of the arc segment is 10-20 mm.

[0028] The beneficial effect is that the radius of the arc section is relatively large, which is conducive to the downward flow of slag, so that the slag is not easy to accumulate at the arc section.

[0029] As a further improvement, the slag chute for the inclined shaft TBM also includes a cover plate, the arc section is integrally bent on the side plate, the upper end of the side plate is also bent to form a fixed flange, and the cover plate is fixed to the fixed flange by fixing screws.

[0030] The beneficial effect is that such a design is conducive to fixing the cover plate on the side plate.

[0031] As a further improvement, the bottom plate is a flat plate.

[0032] The beneficial effects are: not only is the processing of the bottom plate convenient, but also it is conducive to forming the wear-resistant layer on the bottom plate.

[0033] As a further improvement, the side plate and / or bottom plate are made of low-carbon alloy steel, and the mass fractions of the components in the low-carbon alloy steel are C: 0.15-0.20%, Si: 0.20-0.40%, Mn: 0.50-0.80%, W: 0.50-0.80%, Mo: 0.15-0.25%, V: 0.15-0.20%, Ti: 0.07-0.10%, and the remainder is Fe and impurities.

[0034] The beneficial effects are: considering the application conditions of the slag chute, W and a small amount of V and Ti elements are added to the traditional low-carbon steel elements. The W and V elements can improve the hardness and wear resistance of the side plate. At the same time, the W element can refine the grains, reduce the overheating tendency of the steel, prevent the development of temper brittleness, and reduce the deformation of the bottom plate when the wear-resistant layer is welded on the bottom plate; a small amount of Ti can react with the impurity S in the low-carbon steel, reduce the hot brittleness of S, and improve the overall toughness. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1It is a schematic structural diagram of the slag chute for inclined shaft TBM of the present invention;

[0036] In the figure: 1. Side panel; 2. Bottom plate; 3. Wear-resistant layer; 4. Arc segment; 5. Welding seam; 6. Fixed flange; 7. Cover plate; 8. Fixing screws. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0039] It should be noted that the relational terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. In addition, the terms "front", "back", "up", "down", "left" and "right" are based on the orientation and positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention, rather than indicating that the device or component referred to must have a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0040] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0041] Embodiment 1 of the slag chute for inclined shaft TBM of the present invention:

[0042] like Figure 1As shown, the slag chute for the inclined shaft TBM is a trapezoidal trough with a larger top and a smaller bottom, including a bottom plate 2, a side plate 1 and a cover plate 7. The bottom plate 2 is a flat plate extending in the front-to-back direction, and the cover plate 7 is a flat plate extending in the front-to-back direction. The length of the bottom plate 2 is 1.5-1.8m. In other embodiments, the bottom plate can be an arc-shaped plate.

[0043] In this embodiment, two side panels 1 are provided, and the two side panels 1 are respectively provided on the left and right sides of the bottom plate 2; an arc segment 4 is provided between the bottom plate 2 and the corresponding side panel 1, and the arc segment 4 is integrally bent and formed at the lower end of the side panel 1, and the side panel 1 is welded and connected to the bottom plate 2 through the arc segment 4. Among them, a weld 5 is formed between the bottom plate 2 and the arc segment 4. With such a design, before the side panel 1 is welded to the bottom plate 2, an arc segment 4 with a larger curvature can be conveniently bent on the side panel 1 by a bending device. Preferably, the radius of the arc segment 4 is 15 mm, so as to facilitate the downward flow of the slag, so that the slag is not easily accumulated at the arc segment 4, thereby improving the slag discharge efficiency. In other embodiments, the radius of the arc segment is 10 or 20 mm.

[0044] In this embodiment, a fixed flange 6 is formed integrally by bending at the upper end of the side plate 1 , and the cover plate 7 is fixed to the fixed flange 6 by means of fixing screws 8 .

[0045] In this embodiment, the side plate 1 and the bottom plate 2 are both made of low-carbon alloy steel, and the mass fractions of the components in the low-carbon alloy steel are C: 0.15%, Si: 0.40%, Mn: 0.60%, W: 0.80%, Mo: 0.25%, V: 0.20%, Ti: 0.10%, and the remainder is Fe and impurities. Considering the application conditions of the slag chute, W and a small amount of V and Ti elements are added to the traditional low-carbon steel elements. The W and V elements can improve the hardness and wear resistance of the side plate. At the same time, the W element can refine the grains, reduce the overheating tendency of the steel, prevent the development of temper brittleness, and reduce the deformation of the bottom plate when the wear-resistant layer is welded on the bottom plate; a small amount of Ti can react with the impurity S in the low-carbon steel to reduce the hot brittleness of S and improve the overall toughness.

[0046] like Figure 1 As shown, a wear-resistant layer 3 is provided on the inner side of the bottom plate 2, and the wear-resistant layer 3 can improve the wear resistance of the bottom plate 2, thereby reducing the number of replacement times of the slag chute. In other embodiments, no wear-resistant layer is provided on the inner side of the bottom plate, and the bottom plate itself is made of a material with good wear resistance.

[0047] In this embodiment, since a large thickness of the wear-resistant layer 3 will lead to a complicated welding process, and a small thickness of the wear-resistant layer 3 will not meet the use distance requirement, therefore, considering the difficulty of cladding welding and the excavation mileage of the inclined shaft, the thickness of the wear-resistant layer 3 is designed to be 2 mm, that is, to meet the excavation mileage of the inclined shaft, reduce the number of replacements of the slag chute, and the welding difficulty is relatively small. In other embodiments, the thickness of the wear-resistant layer can be 1 mm or 3 mm.

[0048] In this embodiment, the mass fractions of the components in the wear-resistant layer 3 are: Ni powder is 15%, WC powder is 29%, Co powder is 8%, diamond powder is 5%, and the rest is Fe powder. A certain amount of diamond powder is added to the existing conventional wear-resistant powders such as Ni and WC to improve the wear resistance; a high content of diamond powder is not easy to clad, and the content of diamond powder is selected to be 5%, which can better meet the cladding area and cladding thickness of the wear-resistant layer on the bottom plate.

[0049] In this embodiment, since the wear resistance of coarse-grained powder is generally higher than that of fine-grained powder, and WC powder is more wear-resistant than Ni powder, in order to match the wear resistance of Ni powder and WC powder so as to work together, the particle size of WC powder is selected to be 80 mesh and the particle size of Ni powder is selected to be 40 mesh; in addition, the particle sizes of Ni powder and WC powder are different, so that the fine-grained WC powder is more easily evenly distributed in the coarse-grained Ni powder. In other embodiments, the particle size of Ni powder can be 20 or 60 mesh, and the particle size of WC powder can be 60 or 100 mesh.

[0050] In this embodiment, the surface of the diamond powder has a metal coating, and the metal coating includes Ni and Ti. Because the diamond powder is easy to carbonize at high temperature, after the coating, the high temperature first acts on the metal coating, delaying the transmission to the diamond to protect the diamond powder. Among them, the process of coating the surface of the diamond powder is an existing mature technology.

[0051] In this embodiment, according to the process characteristics of 5% diamond powder and 1050-1100°C welding temperature, when the thickness of the metal coating is designed to be 0.2um, the temperature of the diamond powder surface during welding can be effectively controlled not to exceed 700°C, thereby ensuring the performance of the diamond powder.

[0052] In this embodiment, the wear-resistant layer 3 is formed on the inner side of the bottom plate 2 by laser cladding. Specifically, Ni powder, WC powder, and Co powder are mixed and put into the first spray gun, and diamond powder and Fe powder are put into the second spray gun; the mixed powder in the first spray gun is sprayed at a first set angle on the inner side of the bottom plate to form a molten pool, and the mixed powder in the second spray gun is sprayed into the molten pool at a second set angle and included in the alloy powder layer of the first spray gun to form the wear-resistant layer 3. In other embodiments, the wear-resistant layer can be formed on the inner side of the bottom plate by plasma cladding.

[0053] During processing, the wear-resistant layer 3 is first clad on the bottom plate 2, and then the two side plates 1 are welded to the left and right sides of the bottom plate 2 respectively; thereafter, the cover plate 7 is fixed to the fixed flanges 6 of the two side plates 1 by fixing screws 8, and finally a slag chute for the inclined shaft TBM is formed.

[0054] Embodiment 2 of the slag chute for inclined shaft TBM of the present invention:

[0055] The difference between this embodiment and embodiment 1 is that in embodiment 1, the mass fraction of each component in the wear-resistant layer 3 is: Ni powder is 15%, WC powder is 29%, Co powder is 8%, diamond powder is 5%, and the rest is Fe powder. In this embodiment, the mass fraction of each component in the wear-resistant layer is: Ni powder is 15%, WC powder is 29%, Co powder is 8%, diamond powder is 2%, and the rest is Fe powder. In other embodiments, the proportions of Ni powder, WC powder, Fe powder and Co powder can be selected as needed, as long as the diamond powder is 2%-5%.

[0056] Embodiment 3 of the slag chute for inclined shaft TBM of the present invention:

[0057] The difference between this embodiment and embodiment 1 is that in embodiment 1, the slag chute for inclined shaft TBM further includes a cover plate 7, the upper end of the side plate 1 is bent to form a fixed flange 6, and the cover plate 7 is fixed to the fixed flange 6 by fixing screws 8. In this embodiment, the upper end of the side plate is not provided with a fixed flange, but a stud is provided at the upper end of the side plate, and a through hole is provided on the cover plate. After the cover plate is placed on the side plate, the through hole on the cover plate passes through the stud, and the cover plate is fixed to the side plate by nuts.

[0058] Embodiment 4 of the slag chute for inclined shaft TBM of the present invention:

[0059] The difference between this embodiment and embodiment 1 is that in embodiment 1, the mass fractions of the components in the low carbon alloy steel are C: 0.15%, Si: 0.40%, Mn: 0.60%, W: 0.80%, Mo: 0.25%, V: 0.20%, Ti: 0.10%, and the balance is Fe and impurities. In this embodiment, the mass fractions of the components in the low carbon alloy steel are C: 0.20%, Si: 0.30%, Mn: 0.80%, W: 0.60%, Mo: 0.15%, V: 0.15%, Ti: 0.07%, and the balance is Fe and impurities.

[0060] Embodiment 5 of the slag chute for inclined shaft TBM of the present invention:

[0061] The difference between this embodiment and embodiment 1 is that in embodiment 1, the thickness of the metal coating is 0.2 um. In this embodiment, the thickness of the metal coating is 0.25 um. In other embodiments, the thickness of the metal coating can be any value between 0.2 um and 0.25 um.

[0062] Embodiment 6 of the slag chute for inclined shaft TBM of the present invention:

[0063] The difference between this embodiment and embodiment 1 is that in embodiment 1, the radius of the arc segment 4 is 15 mm, so that the arc segment 4 has a larger curvature, which is conducive to the slag sliding down. In this embodiment, the radius of the arc segment is 20 mm, so that the arc segment has a larger curvature, which is conducive to the slag sliding down. In other embodiments, the radius of the arc segment can be 10 mm.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. Slag chute for inclined shaft TBM, including: A bottom plate (2) extending in a front-rear direction; Two side panels (1) are provided, and the two side panels (1) are provided on the left and right sides of the bottom panel (2); It is characterized by further comprising: The circular arc segment (4) is located between the bottom plate (2) and the corresponding side plate (1), the circular arc segment (4) is integrally bent and formed on one of the bottom plate (2) and the side plate (1), and the other of the bottom plate (2) and the side plate (1) is welded and connected to the circular arc segment (4); The bottom plate (2) is a flat plate, and a wear-resistant layer (3) is provided on the inner side of the bottom plate (2); The wear-resistant layer (3) contains 15%-20% Ni powder, 20%-29% WC powder, 5%-10% Co powder, 2%-5% diamond powder and the remainder Fe powder.

2. The slag chute for inclined shaft TBM according to claim 1, characterized in that: The surface of the diamond powder has a metal coating.

3. The slag chute for inclined shaft TBM according to claim 2, characterized in that: The thickness of the metal coating is 0.2-0.25 um.

4. The slag chute for inclined shaft TBM according to any one of claims 1 to 3, characterized in that: The particle size of the Ni powder is 20-60 mesh, and the particle size of the WC powder is 60-100 mesh.

5. The slag chute for inclined shaft TBM according to any one of claims 1 to 3, characterized in that: The thickness of the wear-resistant layer (3) is 1-3 mm.

6. The slag chute for inclined shaft TBM according to any one of claims 1 to 3, characterized in that: The wear-resistant layer (3) is formed on the inner side surface of the bottom plate (2) by laser or plasma cladding.

7. The slag chute for inclined shaft TBM according to any one of claims 1 to 3, characterized in that: The radius of the arc segment (4) is 10-20 mm.

8. The slag chute for inclined shaft TBM according to any one of claims 1 to 3, characterized in that: The slag chute for the inclined shaft TBM also includes a cover plate (7), the arc segment (4) is integrally bent and formed on the side plate (1), the upper end of the side plate (1) is also bent and formed with a fixed flange (6), and the cover plate (7) is fixed to the fixed flange (6) by means of fixing screws (8).

9. The slag chute for inclined shaft TBM according to any one of claims 1 to 3, characterized in that: The side plate (1) and / or the bottom plate (2) are made of low-carbon alloy steel, wherein the mass fractions of the components in the low-carbon alloy steel are C: 0.15-0.20%, Si: 0.20-0.40%, Mn: 0.50-0.80%, W: 0.50-0.80%, Mo: 0.15-0.25%, V: 0.15-0.20%, Ti: 0.07-0.10%, and the remainder is Fe and impurities.

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