Secondary crushing device in cutter chamber of micro-sized slurry balance shield machine

Abstract

The utility model relates to the technical field of shield machine crushing, disclose the secondary crushing device in the cutter bin of small -size slurry balance shield machine, including the main shaft, crushing assembly, the outside of main shaft is covered, the one side of crushing assembly is provided with the sealing plate subassembly, the mixing roller is set up between crushing assembly and sealing plate subassembly, the slurry pipe subassembly is set up in the sealing plate subassembly inside of main shaft, the utility model discloses through crushing assembly has built the multistage crushing of first crushing cavity to second crushing cavity, the strong centrifugal force and shearing force of rotation produce, the big rock, mud cake and fibre group of mixing in slurry are hit, extruded and ground repeatedly, ensure that the particle size of the particle that discharges satisfies the conveying requirement of small -size shield machine small pipe diameter, fundamentally solved the slurry discharge pipe blockage because of the material too big, through sealing plate subassembly, improve the continuity and construction efficiency of shield tunneling, also reduce the security risk that manual cleaning pipeline brings.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine crushing technology, specifically to a secondary crushing device in the cutter chamber of a micro-sized slurry balance tunnel boring machine. Background Technology

[0002] In urban underground pipeline construction, municipal renovation in densely populated urban areas, and the construction of small-section traffic tunnels, miniature slurry balance shield tunneling machines are widely used for short-distance or ultra-small-section tunneling tasks due to their compact size, high mobility, and low requirements for construction space. During construction, to prevent large pieces of cutting material from clogging the slurry discharge pipe, large shield tunneling machines typically have independent crushers or mixing and crushing structures inside the cutterhead or in the slurry discharge system to further break down large, agglomerated cutting materials, ensuring their size meets the requirements for smooth discharge, thereby effectively reducing the risk of slurry discharge pipe blockage.

[0003] However, in the confined internal space of mini-tunnel boring machines (MTBF), not only is it difficult to accommodate such crushing equipment, but the small diameter of the grout discharge pipe due to space constraints also makes it prone to blockage. This makes the risk of grout discharge pipe blockage extremely high when mini-MTBF encounters large or fibrous materials that easily clump together. Once a blockage occurs, the machine must be stopped for cleaning, which not only seriously affects the construction progress, but also the construction efficiency and the personal safety of the workers.

[0004] There are currently no effective solutions to the problems in the relevant technologies. Utility Model Content

[0005] In response to the problems in related technologies, this utility model proposes a secondary crushing device in the cutter chamber of a micro-sized slurry balance shield machine to overcome the aforementioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows: The secondary crushing device inside the cutterhead of a miniature slurry balance shield machine includes a main shaft; a crushing assembly sleeved on the outside of the main shaft; a sealing plate assembly located on one side of the crushing assembly and connected to the outside of the main shaft; a stirring roller located between the crushing assembly and the sealing plate assembly; and a slurry pipe assembly inserted inside the sealing plate assembly.

[0007] Furthermore, to ensure that the discharged particle size meets the conveying requirements of the small-diameter pipes of the micro-tunnel boring machine, the crushing assembly includes several support ring plates arranged at intervals along the axial direction on the outside of the main shaft. A fixing plate is installed on the outside of the support ring plates, and crushing blocks are installed on the outside of the fixing plates. The height of the support ring plates gradually increases from both ends towards the middle of the main shaft, and the cross-section of the support ring plates has a rhomboid structure.

[0008] Furthermore, to achieve real-time axial adjustment of the main shaft and reduce the safety risks associated with manual pipe cleaning, the sealing plate assembly includes a partition plate located on the outside of the main shaft. The partition plate is movably connected to the main shaft via a fastener, and several sealing rings are provided between the partition plate and the main shaft. Long plates are symmetrically arranged on the outside of the partition plate, and a shield sealing plate is provided on one side of each long plate. The fastener includes a groove on the outside of the main shaft, and semi-annular plates are symmetrically arranged inside the groove. Pull-back holes and push-out holes are sequentially formed on the surface of the semi-annular plates along a direction close to their centers. A first screw and a second screw are respectively installed between the pull-back holes and the push-out holes and the partition plate, and the second screw is threadedly connected to the partition plate. The shield sealing plate and the fixed plate form a first crushing chamber on the side near the stirring roller. The shield sealing plate has a right-angled triangular cross-section, and crushing blocks are provided on the side of the shield sealing plate near the fixed plate, forming a second crushing chamber between the shield sealing plate and the fixed plate.

[0009] Furthermore, in order to deliver and discharge slurry, the slurry pipe assembly includes an inlet pipe that is inserted into the top of the partition and inside one of the shield plates, and a outlet pipe that is inserted into the bottom of the partition; the end of the outlet pipe near the partition forms an outlet cavity with the shield plate.

[0010] The beneficial effects of this utility model are as follows: 1. The crushing and sealing components ensure that the discharged particle size meets the conveying requirements of the small-diameter pipes of the micro-small shield tunneling machine, thus ensuring the continuity and high efficiency of the shield tunneling operation and reducing the safety risks of manual pipe cleaning.

[0011] 2. The crushing components construct a multi-stage crushing system from the first crushing chamber to the second crushing chamber. The powerful centrifugal force and shear force generated by the rotation repeatedly impact, squeeze and grind large rocks, mud cakes and fiber clumps mixed in the slurry, ensuring that the particle size of the discharged particles meets the conveying requirements of the small diameter pipes of the micro-small shield machine, fundamentally solving the problem of slurry pipe blockage caused by excessively large materials.

[0012] 3. By using the sealing plate assembly, the width of the first and second crushing chambers can be flexibly adjusted. Workers can adjust the main shaft axially in real time according to the slurry discharge status, which improves the continuity and construction efficiency of shield tunneling, while also reducing the safety risks caused by manual cleaning of pipelines. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1This is a schematic diagram of the secondary crushing device inside the cutter chamber of a miniature slurry balance shield machine according to an embodiment of the present utility model. Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 yes Figure 1 A magnified view of a section at point B in the middle; Figure 4 yes Figure 1 A magnified view of a section at point C; Figure 5 This is a schematic diagram of the structure of the semi-ring plate in the secondary crushing device inside the cutter chamber of a micro-sized slurry balance shield machine according to an embodiment of the present utility model. Figure 6 This is a schematic diagram of the structure of the fixing component in the secondary crushing device inside the cutter chamber of the micro-sized slurry balance shield machine according to an embodiment of the present utility model; Figure 7 This is a cross-sectional view of the fixing component in the secondary crushing device inside the cutter chamber of a miniature slurry balance shield machine according to an embodiment of the present invention.

[0015] In the picture: 1. Main shaft; 2. Crushing assembly; 201. Support ring plate; 202. Fixing plate; 203. Crushing block; 3. Sealing plate assembly; 301. Partition plate; 302. Fixing element; 3021. Groove; 3022. Semi-ring plate; 3023. Pull-back hole; 3024. Push-out hole; 303. Sealing ring; 304. Long plate; 305. Shield sealing plate; 306. First screw; 307. Second screw; 308. Second crushing chamber; 4. Agitator roller; 5. Slurry pipe assembly; 501. Slurry inlet pipe; 502. Slurry outlet pipe; 503. Slurry outlet chamber; 6. First crushing chamber. Detailed Implementation

[0016] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0017] According to an embodiment of the present invention, a secondary crushing device in the cutter chamber of a miniature slurry balance shield machine is provided.

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-7As shown, the configuration method according to an embodiment of the present utility model includes a main shaft 1; a crushing component 2, sleeved on the outside of the main shaft 1; a sealing plate component 3, disposed on one side of the crushing component 2 and connected to the outside of the main shaft 1; a stirring roller 4, disposed between the crushing component 2 and the sealing plate component 3; and a slurry pipe component 5, inserted into the inside of the sealing plate component 3.

[0019] It should be noted that a tunnel boring machine (TBM) typically consists of a cutterhead, shield body, propeller, and muck removal system. It digs the soil by driving the cutterhead to rotate, removes the muck, and then automatically installs concrete segments. The mixing roller 4 is fixed to the cutterhead and is driven by the main shaft 1 to rotate, which in turn drives the cutterhead to rotate around the main shaft 1.

[0020] Using the aforementioned technical solution, a multi-stage crushing system, from the first crushing chamber 6 to the second crushing chamber, is constructed through the crushing component 2. The powerful centrifugal and shearing forces generated by the rotation repeatedly impact, compress, and grind large rocks, mud cakes, and fiber clumps mixed in the slurry, ensuring that the discharged particle size meets the conveying requirements of the small-diameter pipes of the micro-tunnel boring machine. This fundamentally solves the problem of slurry pipe blockage caused by excessively large materials. The width of the first and second crushing chambers can be flexibly adjusted by the sealing plate component 3, and the axial adjustment of the main shaft 1 can be made by the staff in real time according to the slurry discharge status, improving the continuity and construction efficiency of the tunnel boring machine, while also reducing the safety risks associated with manual pipe cleaning.

[0021] In one embodiment, the crushing assembly 2 includes a plurality of support ring plates 201 arranged axially at intervals on the outer side of the main shaft 1. A fixing plate 202 is disposed on the outer side of each support ring plate 201, and crushing blocks 203 are disposed on the outer side of the fixing plate 202. The height of the support ring plates 201 gradually increases from both ends to the middle of the main shaft 1. The cross-section of the support ring plates 201 is rhomboid, enabling multiple impacts, compression, and grinding of large rocks, mud cakes, and fiber clumps mixed in the slurry.

[0022] In one embodiment, the sealing plate assembly 3 includes a partition 301 disposed on the outside of the main shaft 1. The partition 301 is movably connected to the main shaft 1 via a fastener 302, and a plurality of sealing rings 303 are disposed between the partition 301 and the main shaft 1. A long plate 304 is symmetrically disposed on the outside of the partition 301, and a shield sealing plate 305 is disposed on one side of each long plate 304. The fastener 302 includes a groove 3021 formed on the outside of the main shaft 1, and a semi-annular plate 3022 is symmetrically disposed inside the groove 3021. A pull-back hole 3023 and a push-out hole 3024 are sequentially formed on the surface of the semi-annular plate 3022 along a direction close to its center. A first screw 306 and a second screw 307 are respectively disposed between the pull-back hole 3023 and the push-out hole 3024 and the partition 301, and the second screw 307 is threadedly connected to the partition 301. The shield sealing plate 305 and the fixing plate 202 form a first crushing chamber 6 on the side near the stirring roller 4. The shield sealing plate 305 has a right-angled triangular cross-section. A crushing block 203 is provided on the side of the shield sealing plate 305 near the fixed plate 202, and a second crushing chamber 308 is formed between the shield sealing plate 305 and the fixed plate 202. This enables axial adjustment of the main shaft 1, improves the continuity and construction efficiency of the tunnel boring machine, and reduces the safety risks caused by manual cleaning of pipelines.

[0023] The working principle of the crushing component 2 and the sealing plate component 3 is as follows: When the main shaft 1 rotates, it drives the support ring plate 201, the fixed plate 202 and the crushing block 203 to rotate synchronously. Since the height of the support ring plate 201 gradually increases from both ends to the middle, it presents a prismatic structure with a high middle and low ends. Under the action of the shield sealing plate 305, a second crushing chamber 308 is formed. When the slurry of solid impurities enters the second crushing chamber 308 formed between the shield sealing plate 305 and the fixed plate 202 through the first crushing chamber 6, the fixed plate 202 and the shield sealing plate 305 will move relative to each other under the rotation of the main shaft 1, and the slurry will be ground and crushed under the action of the crushing block 203.

[0024] When it is necessary to reduce the width of the first crushing chamber 6 and the second crushing chamber 308, the operator tightens the second screw 307 and pulls the semi-ring plate 3022 and the main shaft 1 to move closer to the partition plate 301. When it is necessary to increase the width of the first crushing chamber 6 and the second crushing chamber 308, the operator tightens the first screw 306 and pushes the semi-ring plate 3022 and the main shaft 1 away from the partition plate 301.

[0025] In one embodiment, the slurry pipe assembly 5 includes a slurry inlet pipe 501 that is inserted through the top of the partition 301 and inside one of the shield plates 305, and a slurry outlet pipe 502 that is inserted through the bottom of the partition 301; the end of the slurry outlet pipe 502 near the partition 301 forms a slurry outlet cavity 503 between itself and the shield plate.

[0026] The working principle of the slurry pipe assembly 5 is as follows: the slurry enters the first crushing chamber 6 through the slurry inlet pipe 501, and the slurry after being crushed by the crushing assembly 2 and the sealing plate assembly 3 enters the second crushing chamber 308. The slurry after secondary crushing enters the slurry discharge chamber 503. Since the slurry discharge pipe 502 is connected to the partition plate 301, the slurry is discharged through the slurry discharge pipe 502.

[0027] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0028] In practical applications, the mixed slurry is first transported to the cutter chamber via the slurry inlet pipe 501. Under the rotation of the main shaft 1, the stirring shaft rotates with the cutter disc, initially crushing the slurry entering the first crushing chamber 6. Simultaneously, the main shaft 1 drives the fixed plate 202 to rotate, and under the action of the shield sealing plate 305, further crushes the initially crushed slurry. If the slurry discharge pipe 502 is blocked, and the width of the first crushing chamber 6 and the second crushing chamber 308 needs to be adjusted, the operator tightens the second screw 307, pushing the semi-annular plate 3022 and the main shaft 1 away from the partition plate 301. (The working principle of the crushing assembly 2 and the sealing plate assembly 3 is as described above.) The crushed slurry flows into the slurry discharge chamber 503 and is discharged under the action of the slurry discharge pipe 502 (The working principle of the slurry pipe assembly 5 is as described above.)

[0029] In summary, by utilizing the above-mentioned technical solution of this utility model, a multi-stage crushing system from the first crushing chamber 6 to the second crushing chamber 308 is constructed through the crushing component 2. The powerful centrifugal force and shear force generated by the rotation repeatedly impact, squeeze, and grind large rocks, mud cakes, and fiber clumps mixed in the slurry, ensuring that the particle size of the discharged particles meets the conveying requirements of the small-diameter pipes of the micro-tunnel boring machine, fundamentally solving the problem of slurry pipe blockage caused by excessively large materials. By flexibly adjusting the width of the first crushing chamber 6 and the second crushing chamber 308 through the sealing plate component 3, the operator can make axial adjustments to the main shaft 1 in real time based on the slurry discharge status, improving the continuity and construction efficiency of the tunnel boring machine, while also reducing the safety risks associated with manual pipe cleaning.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A secondary crushing device inside the cutterhead of a miniature slurry balance shield tunneling machine, characterized in that, include: Main spindle (1); The crushing component (2) is sleeved on the outside of the main shaft (1); A sealing plate assembly (3) is disposed on one side of the crushing assembly (2) and connected to the outside of the main shaft (1); A stirring roller (4) is disposed between the crushing assembly (2) and the sealing plate assembly (3); The slurry tube assembly (5) is inserted into the inner side of the sealing plate assembly (3).

2. The secondary crushing device in the cutterhead of the micro-sized slurry balance shield machine according to claim 1, characterized in that, The crushing component (2) includes a plurality of support ring plates (201) arranged at intervals along the axial direction on the outside of the main shaft (1), a fixing plate (202) is provided on the outside of the support ring plates (201), and a crushing block (203) is provided on the outside of the fixing plate (202).

3. The secondary crushing device inside the cutterhead of the micro-sized slurry balance shield machine according to claim 2, characterized in that, The height of the support ring plate (201) gradually increases from both ends to the middle of the main shaft (1), and the cross-section of the support ring plate (201) is a rhomboid structure.

4. The secondary crushing device in the cutterhead of the micro-sized slurry balance shield machine according to claim 2, characterized in that, The sealing plate assembly (3) includes a partition (301) disposed on the outside of the main shaft (1). The partition (301) is movably connected to the main shaft (1) by a fastener (302), and a plurality of sealing rings (303) are provided between the partition (301) and the main shaft (1). The partition (301) is symmetrically provided with long plates (304) on its outer side, and each of the long plates (304) is provided with a shield plate (305) on one side.

5. The secondary crushing device in the cutterhead of the micro-sized slurry balance shield machine according to claim 4, characterized in that, The fastener (302) includes a groove (3021) formed on the outside of the main shaft (1), and a semi-annular plate (3022) is symmetrically arranged inside the groove (3021). The surface of the semi-ring plate (3022) is provided with a pull-back hole (3023) and an ejection hole (3024) in sequence along the direction close to its center.

6. The secondary crushing device in the cutterhead of the micro-sized slurry balance shield machine according to claim 5, characterized in that, A first screw (306) and a second screw (307) are respectively provided between the pull-back hole (3023) and the push-out hole (3024) and the partition plate (301), and the second screw (307) is connected to the partition plate (301) by a threaded engagement.

7. The secondary crushing device in the cutterhead of the micro-sized slurry balance shield machine according to claim 4, characterized in that, The shield plate (305) and the fixing plate (202) form a first crushing chamber (6) on the side near the stirring roller (4).

8. The secondary crushing device in the cutterhead of the micro-sized slurry balance shield machine according to claim 7, characterized in that, The shield plate (305) has a right-angled triangular cross-section. The shield plate (305) has a crushing block (203) on the side close to the fixed plate (202), and a second crushing chamber (308) is formed between the shield plate (305) and the fixed plate (202).

9. The secondary crushing device in the cutterhead of the micro-sized slurry balance shield machine according to claim 4, characterized in that, The slurry pipe assembly (5) includes a slurry inlet pipe (501) that is inserted through the top of the partition plate (301) and inside one of the shield plates (305), and a slurry outlet pipe (502) that is inserted through the bottom of the partition plate (301). The slurry discharge pipe (502) forms a slurry discharge cavity (503) between the end near the partition plate (301) and the shield sealing plate.

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