A tunnel boring machine

Abstract

The present application relates to the technical field of tunnel construction, and especially discloses a tunnel boring machine, which comprises a shovel plate assembly, and the shovel plate assembly comprises a combined star wheel structure and a protection structure.The combined star wheel structure is composed of a basic star wheel structure and an enhanced star wheel structure, and the basic star wheel structure or the enhanced star wheel structure can be used alone according to the amount of materials to improve the feeding adaptability.The basic star wheel structure and the enhanced star wheel structure are positioned and connected through connecting holes and connecting columns, and a sealing plate and a supporting spring are arranged in the connecting holes to block the connecting holes when the enhanced star wheel structure is not installed.A rotatable reinforcing plate is arranged on the star wheel plate of the enhanced star wheel structure, and the reinforcing plate is supported through a buffer structure, so that the reinforcing plate can rotate to reduce the load when the material extrusion is large.The protection structure comprises a protective net and a supporting ring module, and the supporting ring module rotates with the combined star wheel structure and drives the protective net to shake, so as to block and shake the large materials, and improve the feeding stability and service life.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, specifically to a tunnel boring machine. Background Technology

[0002] Tunnel boring machines (TBMs) are commonly used excavation equipment in tunnel, roadway, and underground engineering construction. They typically consist of the TBM body, cutting head assembly, shovel assembly, conveying mechanism, and traveling mechanism. During construction, the cutting head assembly cuts and crushes the rock, soil, coal, rock, or mixtures in front. The crushed material falls onto the shovel assembly, where a star wheel structure propels it to the rear conveying mechanism, thus achieving continuous excavation and continuous material discharge. Currently, the star wheel structure in the shovel assembly of existing TBMs is usually a fixed-height, integral structure with a relatively fixed feeding capacity. While this can meet basic feeding needs when cutting small amounts of material, it is prone to problems such as sudden increases in feeding load, star wheel deformation due to impact, overload of transmission components, and discontinuous feeding when the material volume, size, or accumulation is large. Increasing the star wheel height directly, however, further increases resistance when material compression is strong, leading to star wheel jamming or accelerated wear of the shovel assembly.

[0003] Meanwhile, large pieces of material generated during tunnel excavation can easily fall directly into the star wheel area from above, impacting the star wheel structure and even becoming stuck between the star wheel and the shovel plate, affecting the normal rotation of the star wheel. Although some existing equipment has protective nets or covers above the star wheel, these protective structures are mostly fixed and only provide simple shielding. They cannot effectively shake, screen, or unload large pieces of material falling above, and the material can still easily accumulate on top of the protective structure, which may affect the feeding efficiency after long-term use. Therefore, a tunnel boring machine is proposed to address the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a tunnel boring machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A tunnel boring machine includes a machine body, a cutting head assembly, and a shovel assembly. The cutting head assembly is mounted on one side of the machine body via a cutting arm, and the shovel assembly is mounted on the front side of the machine body.

[0007] The shovel plate assembly includes a shovel plate body, a height-adjustable combined star wheel structure, and a protective structure. The combined star wheel structure for feeding is installed on the upper side of the shovel plate body, and a protective structure for protecting the combined star wheel structure is provided on the upper side of the combined star wheel structure.

[0008] Preferably, the protective structure includes a protective net disposed on the upper side of the combined star wheel structure, a sleeve rotatably disposed on one side of the protective net, the outer side of the sleeve being rotatably connected to the shovel plate body via a support column, and a support ring module for supporting the protective net being disposed on the lower side of the protective net.

[0009] Preferably, the support ring module includes an inclined support ring body, a support rod connected to the support ring body is installed on the lower side of the support ring body, a support seat is installed at the other end of the support rod, a connecting nose is installed on one side of the support seat, and the support seat is installed on the upper side of the combined star wheel structure by the connecting nose and bolts.

[0010] Preferably, the combined star wheel structure includes a basic star wheel structure and a reinforcing star wheel structure, which are fixedly connected by bolts. The basic star wheel structure includes a basic star wheel body, and a connecting hole is provided on the upper side of the basic star wheel body. A corresponding connecting post is installed on the inner side of the connecting hole, and the other end of the connecting post is installed on the lower side of the reinforcing star wheel structure.

[0011] Preferably, a sealing plate is slidably installed on the inner side of the connecting hole, and a support spring is installed on the lower side of the sealing plate, the support spring being installed on the inner side of the connecting hole.

[0012] Preferably, the enhanced star wheel structure includes a star wheel seat and a star wheel plate installed on the outside of the star wheel seat. A reinforcing plate is provided on the upper side of the star wheel plate, and the reinforcing plate is rotatably connected to the star wheel plate by a hinge. A buffer structure is installed on one side of the reinforcing plate.

[0013] Preferably, there are multiple reinforcing plates, and the reinforcing plates are evenly installed on the upper side of the star wheel plate, and the arrangement path of the reinforcing plates is consistent with the top shape of the star wheel plate.

[0014] Preferably, the buffer structure includes a buffer telescopic rod mounted on the reinforcing plate, the other side of the buffer telescopic rod being mounted on one side of the star wheel plate, and a buffer oil pipe being connected to one end of the buffer telescopic rod on the star wheel plate. A buffer oil cylinder is installed at the other end of the buffer oil pipe, and the buffer oil pipe is connected to the buffer oil cylinder. The buffer oil cylinder is installed inside the star wheel seat.

[0015] Preferably, a piston block is installed on the inner side of the buffer cylinder, a return spring is installed on the other side of the piston block, a limit frame is installed on the other side of the return spring, and the outer side of the limit frame is fixed to the buffer cylinder. A sealing cover is installed on the outer side of the buffer cylinder.

[0016] Preferably, the upper inner side of the buffer cylinder is provided with a threaded groove, and the outer side of the limiting frame is threadedly connected to the buffer cylinder through the threaded groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. In this invention, a combined star wheel structure is set on the shovel body, which is formed by combining a basic star wheel structure and a reinforcing star wheel structure. Under normal working conditions, feeding can be completed using only the basic star wheel structure. When the material volume is large, the material accumulation is serious, or the material feeding capacity needs to be improved, the reinforcing star wheel structure can be installed on top of the basic star wheel structure, thereby increasing the overall feeding height and feeding capacity of the combined star wheel structure and improving the adaptability of the shovel assembly to different material volume conditions. The basic star wheel structure and the reinforcing star wheel structure are positioned by connecting holes and connecting columns and fixed by bolts, which can disperse the impact force on the reinforcing star wheel structure and reduce the offset, loosening, and deformation of the reinforcing star wheel structure during the feeding process. At the same time, a sealing plate and a support spring are set in the connecting hole, which can seal the connecting hole when the reinforcing star wheel structure is not installed, preventing material from entering the connecting hole and causing blockage, making the subsequent installation of the reinforcing star wheel structure smoother.

[0019] 2. In this invention, a rotatable reinforcing plate is provided on the star wheel plate of the reinforced star wheel structure, allowing the reinforcing plate to remain vertical under normal conditions, thereby increasing the effective material feeding height of the reinforced star wheel structure. When there is a large accumulation of material or a large extrusion pressure, the reinforcing plate can rotate under force and reduce the overall effective height of the reinforced star wheel structure, thereby reducing the instantaneous feeding amount and working load of the combined star wheel structure, and reducing the risk of star wheel jamming, transmission overload, and structural deformation. By setting a buffer structure consisting of a buffer telescopic rod, buffer oil pipe, buffer oil cylinder, piston block, return spring, and limit frame, the rotation and return of the reinforcing plate can be supported and controlled, allowing the reinforcing plate to buffer and yield under heavy loads and to return to a vertical state when the material pressure decreases. At the same time, by adjusting the position of the limit frame, the pre-compression amount of the return spring can be changed, thereby adjusting the ease with which the reinforcing plate rotates under force, further improving the adaptability of the combined star wheel structure to different material sizes and accumulation amounts.

[0020] 3. In this invention, a protective structure is installed on the upper side of the combined star wheel structure, allowing the protective net to rotate around the support column as a fulcrum. The support ring module, rotating synchronously with the combined star wheel structure, periodically pushes the protective net. Because the support ring is inclined, the rotation of the combined star wheel structure causes one end of the protective net to move up and down, creating a dynamic protective effect similar to a turbulent screen. This structure not only prevents large pieces of material from directly impacting the combined star wheel structure, but also loosens, disperses, or slips the accumulated material through the up-and-down movement of the protective net. This reduces the jamming, impact damage, and feeding difficulties caused by large pieces of material pressing against the star wheel area for extended periods, thereby improving the protective capability, feeding stability, and service life of the shovel plate assembly. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the shovel plate assembly of the present invention;

[0023] Figure 3 For the present invention Figure 2 Exploded view;

[0024] Figure 4 This is a schematic diagram of the combined star wheel structure of the present invention;

[0025] Figure 5 For the present invention Figure 4 Exploded view;

[0026] Figure 6 This is a schematic diagram of the support ring module of the present invention;

[0027] Figure 7 This is a schematic diagram of the basic star wheel structure of the present invention;

[0028] Figure 8 This is a schematic diagram of the enhanced star wheel structure of the present invention;

[0029] Figure 9 For the present invention Figure 8 A schematic diagram of the structure at point A;

[0030] Figure 10 For the present invention Figure 8 A bottom view;

[0031] Figure 11 For the present invention Figure 8 Exploded view;

[0032] Figure 12 For the present invention Figure 11 A schematic diagram of the structure at point B;

[0033] Figure 13 This is a physical image of the present invention.

[0034] In the diagram: 1. Tunneling machine body; 2. Cutting head assembly; 3. Shovel plate assembly; 31. Shovel plate body; 32. Combined star wheel structure; 33. Protective structure; 331. Protective net; 332. Sleeve; 333. Support column; 334. Support ring module; 3341. Support ring body; 3342. Support rod; 3343. Support seat; 3344. Connecting nose; 321. Basic star wheel structure; 3211. Basic star wheel body; 3213. Sealing plate; 3 214. Support spring; 3215. Connecting hole; 3216. Connecting column; 322. Reinforced star wheel structure; 3221. Star wheel seat; 3222. Star wheel plate; 3223. Hinge; 3224. Reinforcing plate; 3225. Buffer structure; 32251. Buffer telescopic rod; 32252. Buffer oil pipe; 32253. Buffer oil cylinder; 32254. Piston block; 32255. Return spring; 32256. Limiting bracket; 32257. Sealing cover. Detailed Implementation

[0035] Example 1: Please refer to Figure 1-13 The present invention provides a technical solution:

[0036] A tunnel boring machine (TBM) includes a TBM body 1, a cutting head assembly 2, and a shovel assembly 3. The cutting head assembly 2 is mounted on one side of the TBM body 1 via a cutting arm and is used to cut and crush rock strata, coal, or mixed materials in front. The shovel assembly 3 is mounted on the front side of the TBM body 1 and is used to receive the material falling after being crushed by the cutting head assembly 2 and to transport the material to the rear side of the TBM body 1. The shovel assembly 3 includes a shovel body 31, a combined star wheel structure 32, and a protective structure 33. The combined star wheel structure 32 is located on the upper side of the shovel body 31 and is used to convey the material on the shovel body 31. The protective structure 33 is located on the upper side of the combined star wheel structure 32 and is used to shield and protect the combined star wheel structure 32, reducing the possibility of large pieces of material directly falling onto the combined star wheel structure 32.

[0037] The protective structure 33 includes a protective net 331, a sleeve 332, a support column 333, and a support ring module 334. The protective net 331 is positioned above the combined star wheel structure 32. The protective net 331 can be made of metal mesh, grating, or perforated wear-resistant plate, allowing small pieces of material to fall through the protective net 331 onto the combined star wheel structure 32 while intercepting larger pieces of material. One side of the protective net 331 is connected to the sleeve 332, which is rotatably fitted onto the outside of the support column 333. The support column 333 is installed on one side of the shovel body 31, allowing the protective net 331 to swing up and down with the support column 333 as a fulcrum. The other side or lower middle side of the protective net 331 cooperates with the support ring module 334, which periodically pushes the protective net 331, causing it to jolt during the tunneling operation, thereby loosening, rolling, or dispersing large pieces of material accumulated on the protective net 331.

[0038] The support ring module 334 includes a support ring body 3341, a support rod 3342, a support base 3343, and a connecting nose 3344. The support ring body 3341 is inclined, and its lower side is connected to the support rod 3342. The lower end of the support rod 3342 is connected to the support base 3343. A connecting nose 3344 is provided on one side of the support base 3343. The connecting nose 3344 is fixedly installed on the upper side of the combined star wheel structure 32 by bolts. Since the support ring module 334 is fixed on the combined star wheel structure 32, when the combined star wheel structure 32 rotates, the support ring module 334 rotates synchronously with the combined star wheel structure 32. The inclined structure of the support ring body 3341 causes the support height of the lower side of the protective net 331 to change continuously during rotation, resulting in up-and-down movement of the side of the protective net 331 away from the support column 333. At this time, an approximately triangular movable support relationship is formed between the shovel plate body 31, the protective net 331 and the support rod 3342. The inclined setting of the support ring body 3341 is equivalent to causing the support height of one side of the triangle to change periodically, thereby causing the protective net 331 to form a sieve-like shaking action.

[0039] The combined star wheel structure 32 includes a basic star wheel structure 321 and a reinforcing star wheel structure 322. The basic star wheel structure 321 is used as a conventional feeding star wheel, and the reinforcing star wheel structure 322 is detachably installed on the upper side of the basic star wheel structure 321. Under normal working conditions or with a small amount of material, the reinforcing star wheel structure 322 can be removed, and feeding can be completed solely through the basic star wheel structure 321. When cutting a large amount of material, when material accumulation is severe, or when it is necessary to increase the material feeding capacity, the reinforcing star wheel structure 322 can be installed on top of the basic star wheel structure 321, thereby increasing the overall height of the combined star wheel structure 32, thus increasing the material feeding area and feeding capacity.

[0040] The basic star wheel structure 321 includes a basic star wheel body 3211. A connecting hole 3215 is provided on the upper side of the basic star wheel body 3211, and a connecting post 3216 corresponding to the connecting hole 3215 is provided on the lower side of the reinforcing star wheel structure 322. When installing the reinforcing star wheel structure 322, the connecting post 3216 is inserted into the connecting hole 3215, allowing the reinforcing star wheel structure 322 to be initially positioned relative to the basic star wheel structure 321. Then, the basic star wheel structure 321 and the reinforcing star wheel structure 322 are fixedly connected using bolts. The insertion and engagement of the connecting hole 3215 and the connecting post 3216 can disperse the circumferential shearing force and impact force on the reinforcing star wheel structure 322, reducing the possibility of loosening or deformation of the bolts due to shear force alone, thereby improving the connection stability of the combined star wheel structure 32.

[0041] A sealing plate 3213 is slidably installed on the inner side of the connecting hole 3215, and a support spring 3214 is installed on the lower side of the sealing plate 3213. The support spring 3214 is located inside the connecting hole 3215. When the reinforcing star wheel structure 322 is not installed, the support spring 3214 supports the sealing plate 3213 upwards, so that the sealing plate 3213 is located at the upper end of the connecting hole 3215 and seals the connecting hole 3215 to prevent materials such as coal, rock, gravel, and mud from entering the connecting hole 3215 and causing blockage. When the reinforcing star wheel structure 322 is installed, the connecting column 3216 is inserted downwards into the connecting hole 3215, and the sealing plate 3213 is pressed down to overcome the elastic force of the support spring 3214 and slide downwards, so that the connecting column 3216 can smoothly enter the connecting hole 3215. This ensures that the connecting hole 3215 is not easily blocked when the basic star wheel structure 321 is used alone, and also ensures smooth positioning when the reinforcing star wheel structure 322 is installed.

[0042] The reinforced star wheel structure 322 includes a star wheel base 3221 and a star wheel plate 3222. The star wheel plate 3222 is mounted on the outside of the star wheel base 3221 and is used to rotate with the star wheel base 3221 and move material. A reinforcing plate 3224 is provided on the upper side of the star wheel plate 3222, and the reinforcing plate 3224 is rotatably connected to the star wheel plate 3222 via a hinge 3223. The reinforcing plate 3224 remains vertical or nearly vertical under normal conditions, which increases the effective material-moving height of the star wheel plate 3222, thereby improving the material-moving capacity of the combined star wheel structure 32. When there is a large accumulation of material, the material size is large, or the material exerts a large compressive force on the reinforcing plate 3224, the reinforcing plate 3224 can rotate relative to the star wheel plate 3222 around the hinge 3223, thereby reducing the height of the reinforcing plate 3224, thus reducing the overall effective height of the reinforcing star wheel structure 322, reducing the instantaneous material feeding amount and star wheel load, and preventing the combined star wheel structure 32 from jamming, deforming, or overloading due to the compression of large pieces of material.

[0043] The number of reinforcing plates 3224 can be multiple, and the multiple reinforcing plates 3224 are evenly arranged along the upper side of the star wheel plate 3222, and the arrangement path of the multiple reinforcing plates 3224 is adapted to the top shape of the star wheel plate 3222. Through this arrangement, the reinforcing plates 3224 can form a continuous or segmented heightening material-pushing structure at different material-pushing positions of the star wheel plate 3222, so that the reinforced star wheel structure 322 has a good material-pushing height under normal working conditions, and at the same time, it can make segmented clearance when subjected to large forces, avoiding the entire rigid heightening plate directly bearing excessive impact.

[0044] A buffer structure 3225 is connected to one side of the reinforcing plate 3224. The buffer structure 3225 includes a buffer telescopic rod 32251, a buffer oil pipe 32252, a buffer cylinder 32253, a piston block 32254, a return spring 32255, a limit bracket 32256, and a sealing cover 32257. One end of the buffer telescopic rod 32251 is connected to the reinforcing plate 3224, and the other end is connected to the star wheel plate 3222. The buffer telescopic rod 32251 has a buffer chamber for accommodating hydraulic oil. The buffer chamber is connected to the buffer cylinder 32253 through the buffer oil pipe 32252. The buffer cylinder 32253 is installed inside the star wheel seat 3221. Under normal conditions, the return spring 32255 applies pressure to the hydraulic oil in the buffer cylinder 32253 through the piston block 32254. The hydraulic oil acts on the buffer telescopic rod 32251 through the buffer oil pipe 32252, so that the buffer telescopic rod 32251 supports the reinforcing plate 3224, thereby keeping the reinforcing plate 3224 in a vertical state.

[0045] When the reinforcing plate 3224 is compressed by material, it rotates around the hinge 3223 and compresses the buffer telescopic rod 32251. The hydraulic oil in the buffer telescopic rod 32251 flows into the buffer cylinder 32253 through the buffer oil pipe 32252, pushing the piston block 32254 to move and compressing the return spring 32255. Since both the flow of hydraulic oil and the compression of the return spring 32255 have a buffering effect, the reinforcing plate 3224 will not suddenly collapse, but can slowly give way during the stress process, thereby reducing the instantaneous impact of the material on the star wheel plate 3222 and the star wheel seat 3221. After the material pressure decreases, the return spring 32255 pushes the piston block 32254 to return to its original position. The piston block 32254 re-compresses the hydraulic oil, causing the hydraulic oil to flow back into the buffer telescopic rod 32251 through the buffer oil pipe 32252. The buffer telescopic rod 32251 extends and pushes the reinforcing plate 3224 back to its vertical position.

[0046] A limit bracket 32256 is provided inside the buffer cylinder 32253. One end of the return spring 32255 is connected to or abuts against the piston block 32254, and the other end is connected to or abuts against the limit bracket 32256. A sealing cover 32257 is installed at the end of the buffer cylinder 32253 to seal the buffer cylinder 32253. A threaded groove is provided on the upper inner side of the buffer cylinder 32253, and the outer side of the limit bracket 32256 is threadedly connected to the buffer cylinder 32253 through the threaded groove. By tightening or loosening the limit bracket 32256, the position of the limit bracket 32256 inside the buffer cylinder 32253 can be adjusted, thereby changing the pre-compression of the return spring 32255. When the limiting bracket 32256 is screwed inward, the pre-compression of the return spring 32255 increases, the pressure of the piston block 32254 on the hydraulic oil increases, and the reinforcing plate 3224 needs to be subjected to greater material extrusion force to rotate. When the limiting bracket 32256 is screwed outward, the pre-compression of the return spring 32255 decreases, and the reinforcing plate 3224 can rotate and make way more easily under material extrusion. Therefore, the yielding force of the reinforcing plate 3224 can be adjusted according to different material particle size, wetness and viscosity, and accumulation conditions.

[0047] In use, the cutting head assembly 2 cuts and crushes the material in front, and the crushed material falls onto the shovel plate body 31. The combined star wheel structure 32 rotates and conveys the material backward. When only ordinary feeding capacity is required, only the basic star wheel structure 321 can be installed; when the material volume is large, the reinforced star wheel structure 322 is installed above the basic star wheel structure 321 to improve the material feeding height and conveying efficiency. During the feeding process involving the reinforced star wheel structure 322, if the material exerts little pressure on the reinforcing plate 3224, the reinforcing plate 3224 remains vertical and enhances the material feeding capacity; if the material accumulates and the pressure increases, the reinforcing plate 3224 rotates and makes way under the action of the buffer structure 3225, reducing the effective height and instantaneous load of the combined star wheel structure 32, and then resets after the pressure decreases. At the same time, the combined star wheel structure 32 drives the support ring module 334 to rotate synchronously. The inclined support ring body 3341 periodically pushes the protective net 331, causing one end of the protective net 331 to bounce up and down, so as to block and shake off large pieces of material above, reduce the direct impact or crushing of large pieces of material on the combined star wheel structure 32, and improve the feeding stability and service life of the shovel plate assembly 3.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. For those skilled in the art, without departing from the concept of the present invention, appropriate adjustments can be made to the shape, connection method, installation position, and quantity of each structure. For example, the protective net 331 can be configured as a perforated plate or a grid plate, the support ring body 3341 can be configured as an inclined annular component or a partially arc-shaped pushing component, the reinforcing plate 3224 can be configured as a straight plate, an arc plate, or a bent plate, and the buffer structure 3225 can also adjust the arrangement of the buffer cylinder 32253 and the buffer telescopic rod 32251 as needed. All these changes should fall within the scope of protection of the present invention.

Claims

1. A tunnel boring machine, comprising a machine body (1), a cutting head assembly (2), and a shovel plate assembly (3), characterized in that: The cutting head assembly (2) is mounted on one side of the tunneling machine body (1) via the cutting arm, and the front side of the tunneling machine body (1) is equipped with a shovel assembly (3). The shovel plate assembly (3) includes a shovel plate body (31), a height-adjustable combined star wheel structure (32), and a protective structure (33). The upper side of the shovel plate body (31) is equipped with a combined star wheel structure (32) for feeding, and the upper side of the combined star wheel structure (32) is provided with a protective structure (33) for protecting the combined star wheel structure (32). The protective structure (33) includes a protective net (331) set on the upper side of the combined star wheel structure (32). A sleeve (332) is rotatably attached to one side of the protective net (331). The outer side of the sleeve (332) is rotatably connected to the shovel plate body (31) through a support column (333). A support ring module (334) for supporting the protective net is provided on the lower side of the protective net (331). The support ring module (334) includes a support ring body (3341) arranged at an inclination. A support rod (3342) is installed on the lower side of the support ring body (3341) to connect to the support ring body (3341). A support seat (3343) is installed at the other end of the support rod (3342). A connecting nose (3344) is installed on one side of the support seat (3343), and the support seat (3343) is installed on the upper side of the combined star wheel structure (32) through the connecting nose (3344) and bolts. By setting a protective structure on the upper side of the combined star wheel structure, the protective net can rotate with the support column as the fulcrum, and drive the support ring module (334) to rotate synchronously through the combined star wheel structure (32). The inclined support ring body (3341) periodically pushes the protective net (331), causing one end of the protective net (331) to bounce up and down, so as to block and shake off large pieces of material above, and reduce the direct impact or crushing of large pieces of material on the combined star wheel structure (32).

2. The tunnel boring machine according to claim 1, characterized in that: The combined star wheel structure (32) includes a basic star wheel structure (321) and a reinforcing star wheel structure (322). The basic star wheel structure (321) and the reinforcing star wheel structure (322) are fixedly connected by bolts. The basic star wheel structure (321) includes a basic star wheel body (3211). A connecting hole (3215) is provided on the upper side of the basic star wheel body (3211). A corresponding connecting post (3216) is installed on the inner side of the connecting hole (3215), and the other end of the connecting post (3216) is installed on the lower side of the reinforcing star wheel structure (322).

3. A tunnel boring machine according to claim 2, characterized in that: A sealing plate (3213) is slidably installed on the inner side of the connecting hole (3215), and a support spring (3214) is installed on the lower side of the sealing plate (3213). The support spring (3214) is installed on the inner side of the connecting hole (3215).

4. A tunnel boring machine according to claim 3, characterized in that: The enhanced star wheel structure (322) includes a star wheel seat (3221) and a star wheel plate (3222) installed on the outside of the star wheel seat (3221). A reinforcing plate (3224) is provided on the upper side of the star wheel plate (3222), and the reinforcing plate (3224) is rotatably connected to the star wheel plate (3222) through a hinge (3223). A buffer structure (3225) is installed on one side of the reinforcing plate (3224).

5. A tunnel boring machine according to claim 4, characterized in that: The number of reinforcing plates (3224) is multiple, and the reinforcing plates (3224) are evenly installed on the upper side of the star wheel plate (3222). The arrangement path of the reinforcing plates (3224) is consistent with the top shape of the star wheel plate (3222).

6. A tunnel boring machine according to claim 5, characterized in that: The buffer structure (3225) includes a buffer telescopic rod (32251) mounted on a reinforcing plate (3224). The other side of the buffer telescopic rod (32251) is mounted on one side of a star wheel plate (3222). One end of the buffer telescopic rod (32251) on the star wheel plate (3222) is connected to a buffer oil pipe (32252). The other end of the buffer oil pipe (32252) is equipped with a buffer cylinder (32253). The buffer oil pipe (32252) is connected to the buffer cylinder (32253). The buffer cylinder (32253) is mounted on the inner side of the star wheel seat (3221).

7. A tunnel boring machine according to claim 6, characterized in that: A piston block (32254) is installed on the inner side of the buffer cylinder (32253). A return spring (32255) is installed on the other side of the piston block (32254). A limit bracket (32256) is installed on the other side of the return spring (32255), and the outer side of the limit bracket (32256) is fixed to the buffer cylinder (32253). A sealing cover (32257) is installed on the outer side of the buffer cylinder (32253).

8. A tunnel boring machine according to claim 7, characterized in that: The upper inner side of the buffer cylinder (32253) is provided with a threaded groove, and the outer side of the limit frame (32256) is threadedly connected to the buffer cylinder (32253) through the threaded groove.

Images