Small-turning-radius main beam structure and heading machine

Abstract

The small-turning-radius main beam structure comprises a first main beam section, a second main beam section rotationally connected with the first main beam section and an angle stepless adjusting mechanism, the angle stepless adjusting mechanism comprises a first containing groove and a second containing groove, and the first containing groove and the second containing groove are formed between the first main beam section and the second main beam section and located on the two opposite sides of the main beam structure respectively. The size of the first containing groove and the size of the second containing groove change along with rotation of the second main beam section. The angle stepless adjusting mechanism further comprises a first extrusion block and a second extrusion block which are detachably arranged in the first containing groove and the second containing groove respectively, and after the second main beam section rotates by a certain angle relative to the first main beam section, the first extrusion block and the second extrusion block are arranged in the first containing groove and the second containing groove. The second main beam section and the first main beam section are relatively fixed, stepless adjustment of the angle between the second main beam section and the first main beam section can be achieved, in the tunneling process, the first extrusion block and the second extrusion block are not prone to being broken, and the main beam is high in structural strength and good in stability.

Description

Technical Field

[0001] This invention belongs to the field of tunneling machine technology, specifically relating to a small turning radius main beam structure and a tunneling machine. Background Technology

[0002] TBM tunneling machines utilize the cutting rollers on a rotating cutterhead to crush and shear rocks. The cuttings are then picked up by the bucket teeth on the rotating cutterhead and transported backward on the main conveyor belt. The debris is then transported to the outside of the tunnel by traction slag cars or continuous conveyor belts in the tunnel.

[0003] In traditional municipal construction projects, the turning radius of a TBM (tunnel boring machine) is affected by the structural dimensions (diameter-to-length ratio, where length is the distance from the excavation face to the center of the support shoe). The turning radius is relatively large; for example, the turning radius of a 6m diameter TBM is about 200m. Therefore, the turning radius must be taken into account as a basic parameter during the tunnel planning stage. Moreover, whether it is a subway, vehicle, train or water pipeline, too small a turning radius will have adverse effects. Therefore, traditional municipal projects usually do not plan tunnels with small turning radii.

[0004] However, coal mine projects differ from traditional municipal projects. Excessive turning radii are detrimental to tunnel planning, and the turning radius of a coal mine TBM (Tunnel Boring Machine) is determined by the length of the main unit, which in turn depends on the length of the main beam. Existing technologies also mention main beam structures with small turning radii, where the front and rear main beams are connected by a central axis. However, it is unclear how to maintain a fixed angle between the front and rear main beams after rotation during continuous tunneling. Summary of the Invention

[0005] In view of this, the present invention provides a main beam structure for a tunneling machine and a tunneling machine that can stably achieve tunneling with a small turning radius.

[0006] To achieve the above objectives, the first technical solution adopted by the present invention is as follows: A main beam structure for a tunneling machine, the main beam structure includes a first main beam section, a second main beam section rotatably connected to the first main beam section via a rotating shaft, and an angle stepless adjustment mechanism, wherein the rotating shaft extends in the vertical direction; The stepless angle adjustment mechanism includes a first receiving groove and a second receiving groove formed between the first section and the second section of the main beam and located on opposite sides of the main beam structure, respectively. The size of the first receiving groove and the size of the second receiving groove change as the second section of the main beam rotates. The stepless angle adjustment mechanism further includes a first pressing block detachably disposed in the first receiving groove and a second pressing block detachably disposed in the second receiving groove. Different first pressing blocks are disposed in the first receiving groove and different second pressing blocks are disposed in the second receiving groove, so that the two sections of the main beam are fixed at different rotation angle positions relative to the first section of the main beam.

[0007] In the above-mentioned main beam structure for tunneling machines, during the rotation of the two sections of the main beam relative to the first section of the main beam, the size change trend of the first receiving groove is opposite to that of the second receiving groove.

[0008] Optionally, during the process of changing the size of the first receiving groove and / or the second receiving groove, a first pressing block is inserted into the first receiving groove and / or a second pressing block is inserted into the second receiving groove to limit the size of the first receiving groove and / or limit the size of the second receiving groove, thereby fixing the two sections of the main beam relative to the first section of the main beam at different rotation angle positions, and realizing stepless adjustment of the angle between the two sections of the main beam and the first section of the main beam.

[0009] In the above-mentioned main beam structure for tunneling machine, the main beam section includes a main beam section body, a first connecting seat connected to the rear end of the main beam section body, and first limiting parts respectively disposed on the first connecting seat and located on opposite sides of the main beam structure. The main beam section includes a main beam section body, a second connecting seat connected to the front end of the main beam section body, and second limiting parts respectively disposed on the second connecting seat and located on opposite sides of the main beam structure. The first connecting seat and the second connecting seat are rotatably connected by the rotating shaft. The first receiving groove is formed between the first limiting part and the second limiting part on one side, and the second receiving groove is formed between the first limiting part and the second limiting part on the other side.

[0010] Optionally, the stepless angle adjustment mechanism further includes a fixing component for fixing the first extrusion block in the first receiving groove and fixing the second extrusion block in the second receiving groove, respectively.

[0011] Optionally, the fixing component includes a first locking plate and a second locking plate respectively disposed on opposite sides of the main beam structure and detachably connected to the first connecting seat or the second connecting seat, wherein the first pressing block and the second pressing block are both pressed between the first locking plate and the second locking plate.

[0012] Optionally, the first extrusion block includes a first extrusion block body and first column portions formed at both ends of the first extrusion block body; The second extrusion block includes a second extrusion block body and second column portions formed at both ends of the second extrusion block body; The first locking plate has a first insertion hole at the position of the first and second pillars on one side, and the second locking plate has a second insertion hole at the position of the first and second pillars on the other side, so that the first and second pillars on one side are inserted into the first insertion hole, and the first and second pillars on the other side are inserted into the second insertion hole.

[0013] Optionally, the first pressing block, the second pressing block, the first locking plate, and the second locking plate are all detachably connected to the first connecting seat or the second connecting seat.

[0014] Optionally, the first locking plate and the second locking plate are located on opposite sides of the main beam structure, which are different from the opposite sides of the first pressing block and the second pressing block.

[0015] Optionally, the first connecting seat includes a first connecting seat body connected to a section of the main beam and a plurality of first connecting legs integrally connected to the first connecting seat body and spaced apart. The second connecting seat includes a second connecting seat body connected to the two sections of the main beam and a plurality of second connecting legs integrally connected to the second connecting seat body and spaced apart; Each second connecting leg is located between two adjacent first connecting legs or each first connecting leg is located between two adjacent second connecting legs, such that the first connecting legs and the second connecting legs are staggered, and the outermost layer is either a first connecting leg or a second connecting leg; The rotating shaft passes through the first connecting leg and the second connecting leg; The first limiting portion is integrally connected to both sides of the first connecting seat body, and the second limiting portion is integrally connected to both sides of the second connecting seat body.

[0016] Optionally, the first connecting seat and the second connecting seat are provided with a plurality of oil injection channels in the vertical direction corresponding to the positions of the first extrusion block and / or the second extrusion block. The oil injection channels are used to inject lubricating oil into the gap between the rotating shaft and the first connecting seat and the second connecting seat. The first extrusion block and / or the second extrusion block are provided with clearance holes corresponding to the positions of the oil injection channels.

[0017] In the above-mentioned main beam structure for tunneling machines, the first and second receiving grooves or the first and second extrusion blocks extend in the vertical direction, respectively.

[0018] In the above-mentioned main beam structure for tunneling machines, the stepless angle adjustment mechanism also includes a fixing plate, the two ends of which are detachably connected to the first and second sections of the main beam, respectively.

[0019] The second technical solution adopted by the present invention is a tunneling machine, wherein the tunneling machine includes the main beam structure for tunneling machines described above.

[0020] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The main beam structure of the tunneling machine of the present invention, after the second section of the main beam rotates to a certain angle relative to the first section, sets a first compression block and a second compression block in the first and second receiving slots, so that the second section of the main beam is stably maintained at a fixed angle relative to the first section for tunneling operations. During tunneling, the first and second compression blocks are not easily broken, and the main beam structure has high strength and good stability. At the same time, different first and second compression blocks can be set in the first and second receiving slots to achieve stepless adjustment of the rotation angle of the second section of the main beam relative to the first section, so as to adapt to different turning radii of the tunneling machine, making it more versatile and flexible. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a side view of the main beam structure for a tunneling machine according to an embodiment of the present invention; Figure 2 for Figure 1 A top view of the main beam structure; Figure 3 for Figure 1 A top-view enlarged structural diagram of the main beam structure (fixing plate not shown); Figure 4 for Figure 1 Schematic diagram of the first connecting seat of the main beam structure Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure along the middle AA direction; Figure 6 for Figure 1 A three-dimensional structural diagram of the main beam (fixing plate not shown); Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 for Figure 1 A longitudinal sectional view of the connection between the first and second sections of the main beam in the main beam structure. Figure 9 for Figure 1A schematic diagram of the first extrusion block of the main beam structure; Figure 10 for Figure 1 A structural schematic diagram of the first locking plate of the main beam structure; Figure 11 for Figure 1 A schematic diagram of the main beam structure during straight-line advancement; Figure 12 for Figure 1 A structural diagram of the main beam structure when it turns right; Figure 13 for Figure 1 A schematic diagram of the main beam structure when it turns left; Figure label: 100, Main beam section 1; 200, Main beam section 2; 1. Main beam section 1; 2. First connecting seat; 2a. First connecting seat body; 2b. First connecting leg; 3. First limiting part; 4. Main beam section 2; 5. Second connecting seat; 5a. Second connecting seat body; 5b. Second connecting leg; 6. Second limiting part; 7. First extrusion block; 7a. First extrusion block body; 7b. First column; 7c. Second column; 8. Second extrusion block; 9. First locking plate; 9a. First insertion hole; 10. Second locking plate; 11. Fixing plate; 12. Right push cylinder; 13. Rotating shaft; 14. Oil injection channel; 15. Clearance hole; 16. First connecting lug; 17. Second connecting lug; 18. Left support shoe; 19. Right support shoe; 20. Left push cylinder. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art should fall within the protection scope of the present invention.

[0024] To facilitate the description of the relative positional relationships of the components in the main beam structure of the tunneling machine, the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicating directions or positional relationships, are defined with reference to the direction observed by the operator when the tunneling machine is in motion. The cutterhead position is considered "front," and the tail position is considered "rear." Furthermore, the description of directions or positional relationships is only for the convenience of describing the invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the invention.

[0025] Existing patents disclose tunneling machines with small turning radii. Although the main beam structure can be disengaged and rotated, it is unclear how to maintain its stable angle.

[0026] This application redesigns the main beam structure, including a main beam section 1, a main beam section 2 rotatably connected to the main beam section 1 via a rotating shaft, and an angle stepless adjustment mechanism. The angle adjustment mechanism is used to fix the main beam section 1 and the main beam section 2 at different rotation angle positions, and can steplessly adjust the included angle between them to better achieve different turning radii and improve flexibility.

[0027] See Figures 1 to 2 A small turning radius main beam structure for a tunneling machine includes a main beam section 100, a main beam section 200 rotatably connected to the main beam section 100 via a rotating shaft, and a stepless angle adjustment mechanism for adjusting the rotation angle of the main beam section 200 relative to the main beam section 100.

[0028] The rotating shaft extends vertically, allowing the second section 200 of the main beam to turn left or right relative to the first section 100 of the main beam, which helps the tunneling machine to make left or right turns.

[0029] See Figure 3 , Figure 3 This diagram shows a top-down enlarged view of the main beam structure of the tunneling machine. As can be seen, the first main beam section includes a main beam section body 1, a first connecting seat 2 connected to the rear end of the main beam section body 1, and first limiting parts 3 respectively disposed on the first connecting seat 2 and located on opposite sides of the main beam structure. The first limiting parts 3 are located on the left and right sides of the main beam structure. The second main beam section includes a main beam section body 4, a second connecting seat 5 connected to the front end of the main beam section body 4, and second limiting parts 6 respectively disposed on the second connecting seat 5 and located on opposite sides of the main beam structure. The second limiting parts 6 are located on the left and right sides of the main beam structure. The front end of the main beam section body 1 connects to the main drive and cutterhead of the tunneling machine. The first connecting seat 2 and the second connecting seat 5 are rotatably connected via a rotating shaft 13. Figure 5 As shown.

[0030] The stepless angle adjustment mechanism includes a first receiving groove and a second receiving groove formed between the first section 100 and the second section 200 of the main beam and located on the left and right sides of the main beam structure, respectively. The first receiving groove is formed between the first limiting part 3 and the second limiting part 6 on the right side, and the second receiving groove is formed between the first limiting part 3 and the second limiting part 6 on the left side. The size of the first receiving groove and the size of the second receiving groove change with the rotation of the first section 100 of the main beam relative to the second section 200 of the main beam.

[0031] See also Figure 4 , Figure 5 and Figure 8The first connecting seat 2 includes a first connecting seat body 2a connected to the rear end of a section of the main beam body 1 and a plurality of first connecting legs 2b integrally connected to the first connecting seat body 2a and spaced apart.

[0032] The second connecting seat 5 includes a second connecting seat body 5a connected to the front end of the second section of the main beam 4, and a plurality of second connecting legs 5b integrally connected to the second connecting seat body 5a and spaced apart.

[0033] As shown in the figure, there are 3 first connecting legs 2b and 2 second connecting legs 5b. Each second connecting leg 5b is located between two adjacent first connecting legs 2b, so that the first connecting legs 2b and the second connecting legs 5b are staggered. The outermost layer is the first connecting leg 2b. The first limiting part 3 is integrally connected to the left and right sides of the first connecting seat body 2a, and the second limiting part 6 is integrally connected to the left and right sides of the second connecting seat body 5a. The rotating shaft 13 passes through the first connecting leg 2b and the second connecting leg 5b in sequence.

[0034] In other embodiments, the number of first connecting legs can be 2, 4, 5 or other numbers, and the number of second connecting legs can be 3, 4, 5 or other numbers. The number of first connecting legs and the number of second connecting legs can be the same or different, but usually the outermost layer is the first connecting leg or the second connecting leg, so that the first locking plate and the second locking plate are connected to the first connecting leg or the second connecting leg.

[0035] See Figure 3 , Figure 11 and Figure 12 The stepless angle adjustment mechanism also includes a first pressing block 7 that is detachably disposed in the first receiving groove and a second pressing block 8 that is detachably disposed in the second receiving groove. Different first pressing blocks 7 are disposed in the first receiving groove and different second pressing blocks 8 are disposed in the second receiving groove, so that the first section 100 of the main beam is fixed at different rotation angle positions relative to the second section 200 of the main beam.

[0036] During the rotation of the second section 200 of the main beam relative to the first section 100 of the main beam, the sizes of the first and second receiving grooves change. During the changes in the sizes of the first and second receiving grooves, a first pressing block 7 adapted to the size of the first receiving groove is set in the first receiving groove, and a second pressing block 8 adapted to the size of the second receiving groove is set in the second receiving groove to limit the size of the first and second receiving grooves. This allows the second section of the main beam to be fixed at different rotation angle positions relative to the first section of the main beam, enabling stepless adjustment of the included angle between the first section 100 and the second section 200 of the main beam to achieve different turning radii. The adjustment of the turning radius is more flexible, and the main beam structure has strong strength. During the turn, there is also a corresponding pressing block on the side that is not compressed, so the main beam will not rebound due to other situations during the turn.

[0037] In this example, the first receiving groove, the second receiving groove, the first extrusion block 7, and the second extrusion block 8 extend vertically. The materials of the first extrusion block 7 and the second extrusion block 8 are alloy steel or chromium-molybdenum alloy steel, but not limited to these, such as alloy steel with a yield strength of 345 MPa or higher, such as Q345 alloy steel. The first extrusion block 7 and the second extrusion block 8 located in the first receiving groove and the second receiving groove respectively abut against the first limiting part and the second limiting part.

[0038] When the second section of the main beam rotates to a certain angle relative to the first section of the main beam, the first extrusion block 7 and the second extrusion block 8 will not be subjected to horizontal shearing force from the first connecting leg and the second connecting leg during the tunneling process, so that the first extrusion block 7 and the second extrusion block 8 will not break during the turning process, and the main beam structure has high strength.

[0039] During the rotation of the second section 200 of the main beam relative to the first section 100, the size change trend of the first receiving groove is opposite to that of the second receiving groove. The first receiving groove is located on the right side of the main beam structure, and the second receiving groove is located on the left side of the main beam structure. The main beam structure has a straight working state (e.g., Figure 1 ), right turn working status (such as Figure 12 ) and left turn working status (such as Figure 13 When the main beam structure switches from straight-line working state to right-turn working state, the second section of the main beam rotates to the right relative to the first section of the main beam, the size of the first receiving groove decreases, and the size of the second receiving groove increases; when the main beam switches from straight-line working state to left-turn working state, the second section of the main beam rotates to the left relative to the first section of the main beam, the size of the first receiving groove increases, and the size of the second receiving groove decreases.

[0040] See Figures 5 to 8The stepless angle adjustment mechanism also includes a fixing component and a fixing plate 11 for fixing the first extrusion block 7 in the first receiving groove and the second extrusion block 8 in the second receiving groove, respectively. The two ends of the fixing plate 11 are detachably connected to the first section 100 and the second section 200 of the main beam, respectively. When the first section 100 and the second section 200 of the main beam are relatively fixed (when the tunneling machine does not turn, or after the first section 100 of the main beam rotates to a certain angle relative to the second section 200 of the main beam), the fixing plate 11 can be connected to the first section 100 and the second section 200 of the main beam by bolts and nuts to strengthen the strength of the main beam structure and withstand greater lateral forces.

[0041] The fixing assembly includes a first locking plate 9 and a second locking plate 10 respectively disposed on opposite sides of the main beam structure and detachably connected to the first connecting seat. The first locking plate 9 and the second locking plate 10 are disposed on the upper and lower sides of the main beam structure. The first pressing block 7 and the second pressing block 8 are both pressed between the first locking plate 9 and the second locking plate 10. By setting the first locking plate 9 and the second locking plate 10, the first pressing block 7 and the second pressing block 8 can be fixed in the first receiving groove and the second receiving groove to prevent the first pressing block 7 and the second pressing block 8 from falling off during the turning of the main beam structure.

[0042] The first locking plate 9, the second locking plate 10, the first pressing block 7, and the second pressing block 8 are all fixedly connected to the first connecting seat 2 by bolts or bolts and nuts. In other embodiments, the first locking plate 9, the second locking plate 10, the first pressing block 7, and the second pressing block 8 can also be fixedly connected to the first connecting seat 2.

[0043] In this example, all the detachable connections described can be made using bolts or a combination of bolts and nuts.

[0044] See Figure 9 The first extrusion block 7 includes a first extrusion block body 7a and first columnar portions 7b formed at both ends of the first extrusion block body.

[0045] The second extrusion block 8 includes a second extrusion block body and second column portions formed at both ends of the second extrusion block body.

[0046] See Figure 10 The first locking plate 9 has a first insertion hole 9a at the position of the first post 7b and the second post on one side.

[0047] The second locking plate 10 has a second insertion hole at the position of the first post 7b and the second post on the other side, so that the first post 7b and the second post on one side are inserted into the first insertion hole 9a, and the first post 7b and the second post on the other side are inserted into the second insertion hole.

[0048] In some embodiments, the first connecting leg 2b and the second connecting leg are provided with a plurality of oil injection channels 14 in the vertical direction corresponding to the positions of the first extrusion block 7 and the second extrusion block 8 (see [link]). Figure 4 The oil injection channel 14 is used to inject lubricating oil into the gap between the rotating shaft 13 and the first connecting seat and the second connecting seat. The first extrusion block 7 and the second extrusion block 8 have clearance holes 15 at the positions corresponding to the oil injection channel 14 (see Figure 9 When lubricating oil is injected into the rotating shaft 13, the oil injection pipe is inserted into the oil injection channel 14 through the clearance hole 15 to inject oil. After the oil injection is completed, the oil injection pipe is removed.

[0049] During the turning process of the tunneling machine, the first extrusion block 7 and the second extrusion block 8 abut against the first limiting part 3 and the second limiting part 6 respectively. The first extrusion block 7 and the second extrusion block 8 are not subjected to the lateral shear force of the first connecting leg and the second connecting leg. The first extrusion block 7 and the second extrusion block 8 are not easy to break, the turning construction is stable, and the tunneling construction speed can be improved by using a larger thrust.

[0050] In some embodiments of the present invention, a small turning radius TBM tunneling machine including the above-described main beam structure is provided. The tunneling machine also includes a cutterhead, a main drive, and a shield disposed around the main drive.

[0051] The second section 200 of the main beam has a slide rail along its length. The tunneling machine also includes a saddle frame (slide rail and saddle frame not shown in the figure) slidably connected to the slide rail along its length, a left support shoe 18 and a right support shoe 19 respectively movably arranged on the left and right sides of the saddle frame in the horizontal direction, a left support shoe cylinder arranged on the saddle frame for driving the left support shoe 18, a right support shoe cylinder arranged on the saddle frame for driving the right support shoe 19, a left propulsion cylinder 20 rotatably connected between the left support shoe 18 and the first section 100 of the main beam, and a right propulsion cylinder 12 rotatably connected between the right support shoe 19 and the first section 100 of the main beam. The cutterhead is connected to the main drive, and the main drive is connected to the first section 100 of the main beam.

[0052] In some embodiments, first connecting lugs 16 are provided on both the left and right sides of a section 100 of the main beam, and second connecting lugs 17 are respectively provided on the left support shoe 18 and the right support shoe 19. One end of the left push cylinder 20 is rotatably connected to the left first connecting lug 16, and the other end is rotatably connected to the second connecting lug 17 on the left support shoe 18. One end of the right push cylinder 12 is rotatably connected to the right first connecting lug 16, and the other end is rotatably connected to the second connecting lug 17 on the right support shoe 19. Figure 12 As can be seen, the first connecting lug 16 is located near the rear of the main beam section 1, so that the rotational connection between the main beam section 1 and the main beam section 2 is not subject to the propulsion force of the propulsion cylinder, making the structure safer.

[0053] The working principle of the tunneling machine as described above: See Figure 11 When the tunneling machine is tunneling straight, the angle between the first section 100 and the second section 200 of the main beam is 180°. The length extension directions of the first and second sections of the main beam are consistent. The first and second receiving slots are the same size, and the first and second receiving slots are equipped with the same size first extrusion block 7 and second extrusion block 8. The opposite sides (front and rear sides) of the first extrusion block 7 abut against the first limiting part 3 and the second limiting plate 6 on the right side. The opposite sides (front and rear sides) of the second extrusion block 8 abut against the first limiting part 3 and the second limiting part 6 on the left side. The first extrusion block 7, the second extrusion block 8, the first locking plate 9, and the second locking plate 10 are fixedly connected to the first connecting seat by bolts or bolts and nuts. See also Figure 2 The two ends of the fixing plate 11 are fixedly connected to the first and second sections of the main beam to strengthen the main beam structure so that it can withstand greater lateral forces.

[0054] The left propulsion cylinder 20 and the right propulsion cylinder 12 are in the retracted state. The left support shoe 18 and the right support shoe 19 are held firmly against the tunnel wall by the action of the left and right support shoe cylinders. The friction between the left and right support shoes 18 and the tunnel wall provides the propulsion reaction force for the tunneling machine during tunneling. The shield is held firmly against the tunnel wall to reduce the vibration generated during tunneling. The left propulsion cylinder 20 and the right propulsion cylinder 12 provide propulsion force, pushing the cutterhead forward a certain distance. Then, the left and right support shoes 18 and 19 are retracted by the action of the left and right support shoe cylinders, and the left and right propulsion cylinders 20 and 12 are retracted, pulling the saddle forward to slide. The above steps are repeated.

[0055] When a right turn is required and the turning radius is large, the extension stroke of the right support shoe cylinder is greater than that of the left support shoe cylinder. With the left support shoe 18 and the right support shoe 19 pressed against the tunnel wall, the right support shoe cylinder extends while the left support shoe cylinder adjusts accordingly, causing the entire main beam structure to deflect to the right for tunneling, which in turn causes the cutterhead and main drive components to deflect to the right for tunneling.

[0056] When a right turn is required and the turning radius is small, remove the fixing plate, the first locking plate, the second locking plate, the first pressing block, and the second pressing block. Utilize the different extension amounts of the left and right support shoe cylinders to first deflect the two sections of the main beam relative to the first section of the main beam by a certain angle to the right. At this time, the sizes of the first and second receiving grooves are different (the first receiving groove becomes smaller, and the second receiving groove becomes larger). The operator inserts the appropriate first pressing block 7 and second pressing block 8 into the first and second receiving grooves and fixes them to the first connecting seat (e.g., ...). Figure 12As shown), then install the first locking plate, the second locking plate, and the fixing plate to fix the two sections of the main beam and the first section of the main beam at a certain angle. Then, using the stroke difference between the left and right support shoe cylinders (the extension of the right support shoe cylinder is greater than that of the left support shoe cylinder), the entire main beam structure is deflected to the right to perform a large-angle rightward turn and excavation.

[0057] When a left turn is required and the turning radius is large, the stroke of the left support shoe cylinder is greater than that of the right support shoe cylinder. With the left support shoe 18 and the right support shoe 19 pressed against the tunnel wall, the left support shoe cylinder extends while the right support shoe cylinder adjusts accordingly, causing the entire main beam structure to deflect to the left for tunneling, which in turn causes the cutterhead and main drive components to deflect to the left for tunneling.

[0058] When a left turn is required and the turning radius is small, remove the fixing plate, the first locking plate, the second locking plate, the first pressing block, and the second pressing block. Utilize the different extension amounts of the left and right support shoe cylinders to first deflect the two sections of the main beam relative to the first section of the main beam by a certain angle to the left. At this time, the sizes of the first and second receiving grooves are different (the first receiving groove becomes larger, and the second receiving groove becomes smaller). The operator inserts the appropriate first pressing block 7 and second pressing block 8 into the first and second receiving grooves and fixes them to the first connecting seat (e.g., ...). Figure 13 As shown), then install the first locking plate, the second locking plate, and the fixing plate to fix the two sections of the main beam and the first section of the main beam at a certain angle. Based on this angle, use the stroke difference between the left support shoe cylinder and the right support shoe cylinder (the extension of the left support shoe cylinder is greater than the extension of the right support shoe cylinder) to make the entire main beam structure deflect to the left, and then perform large-angle leftward turning excavation.

[0059] Due to structural limitations (interference between the equipment and the tunnel wall), the turning angle of the main beam structure has a limit. When it is necessary to adjust to the limit turning angle, the rotation angle of the two sections of the main beam can be adjusted to the right or left multiple times due to the stroke limitations of the left and right support shoe cylinders.

[0060] The aforementioned main beam structure not only enables the tunnel boring machine (TBM) to turn, but also allows for stepless adjustment of the rotation angle between the first and second main beam sections. Furthermore, once rotated to a certain angle, it can stably advance forward at that angle. The main beam structure boasts high strength, preventing rebound of the second main beam section during turning due to unforeseen circumstances. Moreover, this main beam structure enables TBMs to operate with small turning radii, allowing TBMs with a diameter of 4-6 meters to achieve a turning radius of 50-80 meters, thus solving the problem of TBMs being unable to operate in small-radius tunnels.

[0061] It should also be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" or "more" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0062] In addition, in the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0063] The above embodiments are only used to illustrate the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of the present invention, and the patent protection scope of the embodiments of the present invention should be defined by the claims.

Claims

1. A main beam structure for a tunneling machine, characterized in that, The main beam structure includes a main beam section 1, a main beam section 2 rotatably connected to the main beam section 1 via a rotating shaft, and an angle stepless adjustment mechanism, wherein the rotating shaft extends in the vertical direction. The stepless angle adjustment mechanism includes a first receiving groove and a second receiving groove formed between the first section and the second section of the main beam and located on opposite sides of the main beam structure, respectively. The size of the first receiving groove and the size of the second receiving groove change as the second section of the main beam rotates. The stepless angle adjustment mechanism further includes a first pressing block detachably disposed in the first receiving groove and a second pressing block detachably disposed in the second receiving groove. Different first pressing blocks are disposed in the first receiving groove and different second pressing blocks are disposed in the second receiving groove, so that the two sections of the main beam are fixed at different rotation angle positions relative to the first section of the main beam.

2. The main beam structure for a tunneling machine according to claim 1, characterized in that, During the rotation of the second section of the main beam relative to the first section of the main beam, the size change trend of the first receiving groove is opposite to that of the second receiving groove.

3. The main beam structure for a tunneling machine according to claim 2, characterized in that, During the process of changing the size of the first receiving groove and / or the second receiving groove, a first pressing block is inserted into the first receiving groove and / or a second pressing block is inserted into the second receiving groove to limit the size of the first receiving groove and / or limit the size of the second receiving groove, thereby fixing the two sections of the main beam relative to the first section of the main beam at different rotation angle positions, and realizing stepless adjustment of the angle between the two sections of the main beam and the first section of the main beam.

4. The main beam structure for a tunneling machine according to any one of claims 1 to 3, characterized in that: The main beam section includes a main beam section body, a first connecting seat connected to the rear end of the main beam section body, and first limiting parts respectively disposed on the first connecting seat and located on opposite sides of the main beam structure; The main beam section includes a main beam section body, a second connecting seat connected to the front end of the main beam section body, and second limiting parts respectively disposed on the second connecting seat and located on opposite sides of the main beam structure. The first connecting seat and the second connecting seat are rotatably connected by the rotating shaft. The first receiving groove is formed between the first limiting part and the second limiting part on one side, and the second receiving groove is formed between the first limiting part and the second limiting part on the other side.

5. The main beam structure for a tunneling machine according to claim 4, characterized in that, The stepless angle adjustment mechanism further includes a fixing component for fixing the first extrusion block in the first receiving groove and the second extrusion block in the second receiving groove, respectively.

6. The main beam structure for a tunneling machine according to claim 5, characterized in that, The fixing component includes a first locking plate and a second locking plate respectively disposed on opposite sides of the main beam structure and detachably connected to the first connecting seat or the second connecting seat, wherein the first pressing block and the second pressing block are both pressed between the first locking plate and the second locking plate.

7. The main beam structure for a tunneling machine according to claim 6, characterized in that, The first extrusion block includes a first extrusion block body and first column portions formed at both ends of the first extrusion block body; The second extrusion block includes a second extrusion block body and second column portions formed at both ends of the second extrusion block body; The first locking plate has a first insertion hole at the position of the first and second pillars on one side, and the second locking plate has a second insertion hole at the position of the first and second pillars on the other side, so that the first and second pillars on one side are inserted into the first insertion hole, and the first and second pillars on the other side are inserted into the second insertion hole.

8. The main beam structure for a tunneling machine according to claim 6, characterized in that, The first pressing block, the second pressing block, the first locking plate, and the second locking plate are all detachably connected to the first connecting seat or the second connecting seat; and / or, The first locking plate and the second locking plate are located on opposite sides of the main beam structure, which are different from the opposite sides of the first extrusion block and the second extrusion block.

9. The main beam structure for a tunneling machine according to claim 8, characterized in that: The first connecting seat includes a first connecting seat body connected to a section of the main beam and a plurality of first connecting legs integrally connected to the first connecting seat body and spaced apart. The second connecting seat includes a second connecting seat body connected to the two sections of the main beam and a plurality of second connecting legs integrally connected to the second connecting seat body and spaced apart; Each second connecting leg is located between two adjacent first connecting legs or each first connecting leg is located between two adjacent second connecting legs, such that the first connecting legs and the second connecting legs are staggered, and the outermost layer is either a first connecting leg or a second connecting leg; The rotating shaft passes through the first connecting leg and the second connecting leg; The first limiting portion is integrally connected to both sides of the first connecting seat body, and the second limiting portion is integrally connected to both sides of the second connecting seat body.

10. The main beam structure for a tunneling machine according to claim 4, characterized in that, The first connecting seat and the second connecting seat are provided with multiple oil injection channels in the vertical direction corresponding to the positions of the first extrusion block and / or the second extrusion block. The oil injection channels are used to inject lubricating oil into the gap between the rotating shaft and the first connecting seat and the second connecting seat. The first extrusion block and / or the second extrusion block are provided with clearance holes corresponding to the positions of the oil injection channels.

11. The main beam structure for a tunneling machine according to claim 1, characterized in that, The first and second receiving grooves or the first and second extrusion blocks extend in the vertical direction, respectively.

12. The main beam structure for a tunneling machine according to claim 1, characterized in that, The stepless angle adjustment mechanism also includes a fixing plate, the two ends of which are detachably connected to the first section and the second section of the main beam, respectively.

13. A tunneling machine, characterized in that, The tunneling machine includes the main beam structure for tunneling machines as described in any one of claims 1 to 12.

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