A type of screw conveyor for rear excavation

Abstract

This invention discloses a rear-exit auger, relating to the field of tunnel boring machine (TBM) technology. It solves the problems of limited side opening area of ​​the auger, which makes it difficult to display the amount of soil output, easily leading to internal blockage. Furthermore, the hydraulic motor is installed inside the auger, making maintenance and repair difficult in case of malfunction. The rear-exit auger includes a front cylinder with an intermediate connecting cylinder at one end. Soil pressure sensors are installed on the outer surfaces of both ends of the intermediate connecting cylinder, and a discharge connecting cylinder is located at the other end. This invention, by opening at the rear of the auger and adding a control gate, and driving the conveying screw through a auger drive mechanism, outputs soil scraped from the tunnel wall during TBM operation from the rear of the auger. Compared to traditional side-exit augers, rear-exit soil output is less likely to clog the auger and facilitates maintenance and repair.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine technology, specifically to a rear-excavation type screw conveyor. Background Technology

[0002] A tunnel boring machine (TBM) is a type of tunnel boring machine that uses the shield tunneling method. The shield tunneling method involves the TBM constructing (laying) the "shield" (referring to supporting segments) of the tunnel while excavating. TBMs are generally classified according to their working principle into manual excavation TBMs, extrusion TBMs, semi-mechanical TBMs (local pneumatic, global pneumatic), and mechanical TBMs (open-chest cutting TBMs, pneumatic TBMs, slurry pressurized TBMs, earth pressure balance TBMs, hybrid TBMs, and special-shaped TBMs).

[0003] During the tunneling process, the tunnel boring machine excavates a large amount of soil from the inner wall of the tunnel. The excavated soil needs to be transported to the outside of the tunnel boring machine by a screw conveyor. The principle of the screw conveyor is that the screw at the front of the machine extracts the soil excavated by the tunnel boring machine and transports it away from the tunnel boring machine.

[0004] The current screw conveyor uses a side discharge method, which involves opening an opening on the side wall at the rear of the screw conveyor to allow soil to exit from the screw conveyor. However, the opening area on the side wall of the screw conveyor is limited, which can affect the amount of soil output from the inside of the screw conveyor and easily lead to blockage inside the screw conveyor. In addition, the hydraulic motor is installed inside the screw conveyor, making maintenance and repair difficult when a malfunction occurs. Therefore, it does not meet the current requirements. To address this, we propose a rear-discharge screw conveyor. Summary of the Invention

[0005] The purpose of this invention is to provide a rear-exit type screw conveyor to solve the problems mentioned in the background art, such as the limited opening area of ​​the screw conveyor sidewall, which shows the amount of soil output from the screw conveyor, which easily leads to blockage inside the screw conveyor, and the difficulty in maintenance and repair when the hydraulic motor is installed inside the screw conveyor and malfunctions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rear-exit type screw conveyor, comprising a front cylinder, an intermediate connecting cylinder at one end of the front cylinder, soil pressure sensors at both ends of the intermediate connecting cylinder, a discharge connecting cylinder at the other end of the intermediate connecting cylinder, a first drive mechanism protective shell and a second drive mechanism protective shell at the middle of the discharge connecting cylinder and the intermediate connecting cylinder, the first drive mechanism protective shell being connected to the end of the intermediate connecting cylinder and the second drive mechanism protective shell being connected to the end of the discharge connecting cylinder, a gate fixing cylinder at the other end of the discharge connecting cylinder, and a gate mechanism at the middle of the gate fixing cylinder and the discharge connecting cylinder;

[0007] The gate mechanism includes a gate mounting base, which is located between the discharge connecting cylinder and the gate fixing cylinder and is connected by fasteners such as screws. A movable gate is slidably arranged in the middle of the gate mounting base. The upper end of the movable gate penetrates the top surface of the gate mounting base, and gate connecting blocks are provided on both sides of the top end. A connecting rod is provided through the middle of the gate connecting block and is connected to the movable gate through a connecting pin. An electric telescopic rod is provided below the gate connecting block, and the two electric telescopic rods are respectively connected to the two sides of the gate mounting base.

[0008] A helical drive mechanism is disposed between the first drive mechanism protective housing and the second drive mechanism protective housing. The helical drive mechanism includes a support ring, a rotating sleeve disposed on the inner side of the support ring, and a filling ring disposed on the outer side of the rotating sleeve. The filling ring is located between the second drive mechanism protective housing and the first drive mechanism protective housing. A conveying screw is disposed through the middle connecting cylinder and the middle of the second drive mechanism protective housing. One end of the conveying screw passes through the middle of the rotating sleeve and extends into the discharge connecting cylinder. A drive rotating ring is disposed on the outer surface of the support ring. The drive rotating ring is fixedly connected to the rotating sleeve. A transmission gear ring is disposed on the outer surface of the drive rotating ring. A drive gear meshing with the drive gear ring is disposed on one side of the transmission gear ring. A hydraulic motor is disposed on the outer side of the end of the second drive mechanism protective housing connected to the discharge connecting cylinder. The output end of the hydraulic motor passes through the second drive mechanism protective housing and is connected to the drive gear through a fixing pin.

[0009] Preferably, the upper surface of the intermediate connecting cylinder is provided with a tie rod assembly connecting seat, and the tie rod assembly is provided between the tie rod assembly connecting seat and the top surface of the inner wall of the tunnel boring machine.

[0010] Preferably, the tie rod assembly includes an intermediate connecting pipe, the intermediate connecting pipe is hollow in the middle and both ends are slidably connected to end connecting rods, one end of the end connecting rod is located outside the intermediate connecting pipe and the end is provided with a connecting hole, a bolt or a pin is inserted in the middle of the connecting hole, and the end connecting rod is connected to the tie rod assembly connecting seat and the top surface of the inner wall of the tunnel boring machine by bolts or pins.

[0011] Preferably, a first support seat and a second support seat are respectively provided between the rotating sleeve and the protective housing and support ring of the first drive mechanism, and the first support seat and the second support seat are respectively connected to the protective housing and support ring of the first drive mechanism by screws.

[0012] Preferably, the inner wall of the transmission gear ring and the outer surface of the rotating sleeve in contact with the second support are provided with T-shaped ring grooves, and a sealing ring is provided on the inner side of the T-shaped ring groove. Sealing rings are also installed between the first support, the protective housing of the first drive mechanism and the rotating sleeve and the second support, the rotating sleeve and the support ring.

[0013] Preferably, the outer wall of the spiral blades of the conveying screw passing through the middle of the rotating sleeve is in contact with the inner wall of the rotating sleeve, and the spiral blades of the conveying screw passing through the middle of the rotating sleeve are fixed to the rotating sleeve by welding.

[0014] Preferably, a first end connecting ring is provided on the outer side of the end of the intermediate connecting cylinder that contacts the protective housing of the first drive mechanism and the end of the discharge connecting cylinder that contacts the protective housing of the second drive mechanism. The two first end connecting rings are respectively fixed to the outside of the protective housing of the first drive mechanism and the protective housing of the second drive mechanism by screws.

[0015] Preferably, the surfaces of the two first end connecting rings that contact the first drive mechanism protective housing and the second drive mechanism protective housing are each provided with an annular sealing groove, and a rubber sealing ring is provided on the inner side of the annular sealing groove.

[0016] Preferably, both sides of the gate mounting base are provided with side U-shaped mounting blocks, and the electric telescopic rod is installed in the middle of the side U-shaped mounting blocks and connected to the side U-shaped mounting blocks by pins.

[0017] Preferably, a gate sealing gasket is provided between the inner end of the gate sealing end plate and the gate mounting seat, and between the inner wall of the gate sealing end plate and the movable gate. The gate sealing gasket is made of rubber and is injection molded.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention opens the rear end of the screw conveyor and adds a control gate, and drives the conveying screw through a screw drive mechanism to output the soil scraped from the tunnel wall during the operation of the tunnel boring machine from the rear of the screw conveyor. Compared with the traditional screw conveyor that outputs soil from the side, the soil output from the rear is less likely to clog the screw conveyor, and it is also convenient to inspect and maintain the screw conveyor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a cross-sectional view of the entire invention;

[0022] Figure 3 This is a schematic diagram of the gate mechanism of the present invention;

[0023] Figure 4 This is a cross-sectional view of the movable gate of the present invention;

[0024] Figure 5 This is a schematic diagram of the helical drive mechanism of the present invention;

[0025] Figure 6 For the present invention Figure 1 A schematic diagram of the structure at point A in the middle.

[0026] In the diagram: 1. Front cylinder; 2. Intermediate connecting cylinder; 3. Conveying screw; 4. Screw drive mechanism; 401. Drive ring; 402. Support ring; 403. Rotating sleeve; 404. Sealing ring; 405. Drive gear; 406. Filling ring; 407. First support seat; 408. Second support seat; 409. Transmission gear ring; 5. Gate mechanism; 501. Movable gate; 502. Electric telescopic rod; 503. Gate mounting seat; 504. Side U-shaped mounting block; 505. Gate sealing gasket; 506. Gate sealing end plate; 507. Gate connecting block; 6. Discharge connecting cylinder; 7. Sealing ring; 8. First end connecting ring; 9. First drive mechanism protective housing; 10. Second drive mechanism protective housing; 11. Gate fixing cylinder; 12. Hydraulic motor; 13. Tie rod assembly connecting seat; 14. Soil pressure sensor; 15. Tie rod assembly. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] The hydraulic motor 12 (model 130ST-M15025) and soil pressure sensor 14 (model QSY8904) mentioned in this invention can be obtained from the market or through private customization.

[0029] Please see Figures 1 to 6 An embodiment of the present invention provides a rear-exit type screw conveyor, including a front cylinder 1, an intermediate connecting cylinder 2 at one end of the front cylinder 1, soil pressure sensors 14 on the outer surfaces of both ends of the intermediate connecting cylinder 2, a discharge connecting cylinder 6 at the other end of the intermediate connecting cylinder 2, a first drive mechanism protective shell 9 and a second drive mechanism protective shell 10 at the middle of the discharge connecting cylinder 6 and the intermediate connecting cylinder 2, the first drive mechanism protective shell 9 being connected to the end of the intermediate connecting cylinder 2 and the second drive mechanism protective shell 10 being connected to the end of the discharge connecting cylinder 6, a gate fixing cylinder 11 at the other end of the discharge connecting cylinder 6, and a gate mechanism 5 at the middle of the gate fixing cylinder 11 and the discharge connecting cylinder 6;

[0030] The gate mechanism 5 includes a gate mounting base 503, which is located between the discharge connecting cylinder 6 and the gate fixing cylinder 11 and is connected by fasteners such as screws. A movable gate 501 is slidably arranged in the middle of the gate mounting base 503. The upper end of the movable gate 501 penetrates the top surface of the gate mounting base 503 and gate connecting blocks 507 are provided on both sides of the top end. A connecting rod is provided in the middle of the gate connecting block 507 and is connected to the movable gate 501 by a connecting pin. An electric telescopic rod 502 is provided below the gate connecting block 507. The two electric telescopic rods 502 are respectively connected to the two sides of the gate mounting base 503.

[0031] A helical drive mechanism 4 is disposed between the first drive mechanism protective housing 9 and the second drive mechanism protective housing 10. The helical drive mechanism 4 includes a support ring 402, a rotating sleeve 403 disposed inside the support ring 402, and a filling ring 406 disposed outside the rotating sleeve 403. The filling ring 406 is located between the second drive mechanism protective housing 10 and the first drive mechanism protective housing 9. A conveying screw 3 is disposed through the middle connecting cylinder 2 and the second drive mechanism protective housing 10. One end of the conveying screw 3 extends from the middle of the rotating sleeve 403. The support ring 402 extends through and into the discharge connecting cylinder 6. A drive rotating ring 401 is provided on the outer surface of the support ring 402. The drive rotating ring 401 is fixedly connected to the rotating sleeve 403. A transmission gear ring 409 is provided on the outer surface of the drive rotating ring 401. A drive gear 405 meshing with the transmission gear ring 409 is provided on one side of the transmission gear ring 409. A hydraulic motor 12 is provided on the outer side of the end of the second drive mechanism protective housing 10 connected to the discharge connecting cylinder 6. The output end of the hydraulic motor 12 passes through the second drive mechanism protective housing 10 and is connected to the drive gear 405 through a fixing pin.

[0032] The rotating sleeve 403 is provided with a first support base 407 and a second support base 408 between the first drive mechanism protective housing 9 and the support ring 402. The first support base 407 and the second support base 408 are respectively connected to the first drive mechanism protective housing 9 and the support ring 402 by screws. The inner wall of the transmission gear ring 409 and the outer surface of the rotating sleeve 403 in contact with the second support base 408 are provided with T-shaped ring grooves. A sealing ring 404 is provided on the inner side of the T-shaped ring groove. The sealing ring 404 is also installed between the first support base 407, the first drive mechanism protective housing 9 and the rotating sleeve 403 and the second support base 408, and the rotating sleeve 403 and the support ring 402.

[0033] By adopting the above technical solution, the position of the rotating sleeve 403 is restricted by the first support 407 and the second support 408, and the gap between the rotating sleeve 403 and the surrounding connecting parts is filled by the sealing ring 404 to ensure the sealing of the inside of the screw conveyor.

[0034] The intermediate connecting cylinder 2 is provided with a first end connecting ring 8 at the end that contacts the first drive mechanism protective housing 9 and the discharge connecting cylinder 6 is provided with a first end connecting ring 8 at the end that contacts the second drive mechanism protective housing 10. The two first end connecting rings 8 are respectively fixed to the outside of the first drive mechanism protective housing 9 and the second drive mechanism protective housing 10 by screws. The surfaces of the two first end connecting rings 8 that contact the first drive mechanism protective housing 9 and the second drive mechanism protective housing 10 are provided with annular sealing grooves. A rubber sealing ring 7 is provided on the inner side of the annular sealing groove.

[0035] By adopting the above technical solution, after the intermediate connecting cylinder 2 and the discharge connecting cylinder 6 are connected to the first drive mechanism protective housing 9 and the second drive mechanism protective housing 10 respectively, the sealing of the ends of the intermediate connecting cylinder 2 and the discharge connecting cylinder 6 is guaranteed, and the moisture contained in the soil during transportation is prevented from seeping outward.

[0036] Among them, the inner end of the gate sealing end plate 506 and the middle of the gate mounting seat 503, and the inner wall of the gate sealing end plate 506 and the middle of the movable gate 501 are both provided with gate sealing gaskets 505. The gate sealing gaskets 505 are made of rubber and are injection molded.

[0037] By adopting the above technical solution, the sealing between the movable gate 501 and the gate mounting base 503 can be guaranteed, ensuring that there will be no gap between the movable gate 501 and the gate mounting base 503 during the sliding process.

[0038] The outer wall of the spiral blade of the conveying screw 3 passing through the middle of the rotating sleeve 403 is in contact with the inner wall of the rotating sleeve 403, and the spiral blade of the conveying screw 3 passing through the middle of the rotating sleeve 403 is fixed to the rotating sleeve 403 by welding.

[0039] By adopting the above technical solution, welding ensures that the rotating sleeve 403 can drive the conveying screw 3 to rotate around the axis of the rotating sleeve 403 after being subjected to force and rotated, thereby realizing the spiral rotation of the conveying screw 3 and smoothly transporting the soil.

[0040] The gate mounting base 503 has side U-shaped mounting blocks 504 on both sides, and the electric telescopic rod 502 is installed in the middle of the side U-shaped mounting blocks 504 and connected to the side U-shaped mounting blocks 504 by pins.

[0041] The upper surface of the intermediate connecting cylinder 2 is provided with a tie rod assembly connecting seat 13. A tie rod assembly 15 is provided between the tie rod assembly connecting seat 13 and the top surface of the inner wall of the tunnel boring machine. The tie rod assembly 15 includes an intermediate connecting pipe. The middle of the intermediate connecting pipe is hollow and both ends are slidably connected with end connecting rods. One end of the end connecting rod is located outside the intermediate connecting pipe and a connecting hole is provided through the end. A bolt or a shaft pin is inserted in the middle of the connecting hole. The end connecting rod is connected to the tie rod assembly connecting seat 13 and the top surface of the inner wall of the tunnel boring machine by bolts or shaft pins.

[0042] By adopting the above technical solution, the working angle of the screw conveyor can be adjusted through the tie rod assembly 15, so that the screw conveyor can better extract soil.

[0043] Working principle: During operation, when transporting soil generated during the tunnel boring machine's work, the power supply to the auger is first turned on. After the auger is powered on, the two electric telescopic rods 502 are energized and start, pushing the gate connecting block 507 to move. At this time, the two gate connecting blocks 507 drive the movable gate 501 connected to them to move, causing the movable gate 501 to slide inside the gate mounting seat 503, opening the previously closed gate mounting seat 503. Subsequently, the hydraulic motor 12 starts and drives the drive gear 405 to rotate, driving the transmission gear ring 409 and the drive rotating ring 401 to rotate. The drive rotating ring 401 will drive the rotating sleeve 403 connected to it to rotate synchronously when rotating. Since the spiral blades of the conveying screw 3, which pass through the middle of the rotating sleeve 403, are fixed to the rotating sleeve 403, the rotating sleeve 403 will drive the conveying screw 3 to rotate around the axis of the rotating sleeve 403 when it rotates. At this time, the conveying screw 3 will draw soil from the front cylinder 1 port into the intermediate connecting cylinder 2 and into the discharge connecting cylinder 6 through the spiral motion. The soil is discharged outward through the open conveying screw 3. By using the rear discharge method of the screw conveyor to transport the soil generated during the tunnel boring machine, the rear opening diameter of the screw conveyor is larger, the soil throughput is greater and it is not easy to be blocked. In addition, the hydraulic motor 12 is installed outside the screw conveyor, which makes it easier to inspect and maintain in case of failure.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rear-excavation type screw conveyor, comprising a front cylinder (1), characterized in that: One end of the front cylinder (1) is provided with an intermediate connecting cylinder (2), and soil pressure sensors (14) are provided on the outer surfaces of both ends of the intermediate connecting cylinder (2). The other end of the intermediate connecting cylinder (2) is provided with a discharge connecting cylinder (6). A first drive mechanism protective shell (9) and a second drive mechanism protective shell (10) are provided between the discharge connecting cylinder (6) and the intermediate connecting cylinder (2). The first drive mechanism protective shell (9) is connected to the end of the intermediate connecting cylinder (2), and the second drive mechanism protective shell (10) is connected to the end of the discharge connecting cylinder (6). The other end of the discharge connecting cylinder (6) is provided with a gate fixing cylinder (11), and a gate mechanism (5) is provided between the gate fixing cylinder (11) and the discharge connecting cylinder (6). The gate mechanism (5) includes a gate mounting base (503), which is located between the discharge connecting cylinder (6) and the gate fixing cylinder (11) and is connected by screws. A movable gate (501) is slidably arranged in the middle of the gate mounting base (503). The upper end of the movable gate (501) penetrates the top surface of the gate mounting base (503) and gate connecting blocks (507) are provided on both sides of the top end. A connecting pin is provided in the middle of the gate connecting block (507) and is connected to the movable gate (501) through the connecting pin. An electric telescopic rod (502) is provided below the gate connecting block (507). The two electric telescopic rods (502) are respectively connected to the two sides of the gate mounting base (503). A helical drive mechanism (4) is provided between the first drive mechanism protective housing (9) and the second drive mechanism protective housing (10). The helical drive mechanism (4) includes a support ring (402), a rotating sleeve (403) is provided on the inner side of the support ring (402), and a filling ring (406) is provided on the outer side of the rotating sleeve (403). The filling ring (406) is located between the second drive mechanism protective housing (10) and the first drive mechanism protective housing (9). A conveying screw (3) is provided through the middle connecting cylinder (2) and the second drive mechanism protective housing (10). One end of the conveying screw (3) extends from the rotating sleeve (403). The middle of the support ring (402) passes through and extends into the discharge connecting cylinder (6). The outer surface of the support ring (402) is provided with a drive rotating ring (401). The drive rotating ring (401) is fixedly connected to the rotating sleeve (403). The outer surface of the drive rotating ring (401) is provided with a transmission gear ring (409). One side of the transmission gear ring (409) is provided with a drive gear (405) that meshes with it. The outer side of the end of the second drive mechanism protective housing (10) connected to the discharge connecting cylinder (6) is provided with a hydraulic motor (12). The output end of the hydraulic motor (12) passes through the second drive mechanism protective housing (10) and is connected to the drive gear (405) by a fixing pin. The upper surface of the intermediate connecting cylinder (2) is provided with a tie rod assembly connecting seat (13), and a tie rod assembly (15) is provided between the tie rod assembly connecting seat (13) and the top surface of the inner wall of the tunnel boring machine. The tie rod assembly (15) includes an intermediate connecting pipe. The middle of the intermediate connecting pipe is hollow and both ends are slidably connected to end connecting rods. One end of the end connecting rod is located outside the intermediate connecting pipe and a connecting hole is provided through the end. A bolt or a shaft pin is inserted in the middle of the connecting hole. The end connecting rod is connected to the tie rod assembly connecting seat (13) and the top surface of the inner wall of the tunnel boring machine by bolts or shaft pins. The rotating sleeve (403) is provided with a first support seat (407) and a second support seat (408) in the middle of the first drive mechanism protective housing (9) and the support ring (402). The first support seat (407) and the second support seat (408) are respectively connected to the first drive mechanism protective housing (9) and the support ring (402) by screws.

2. The rear-excavation type screw conveyor according to claim 1, characterized in that: The inner wall of the transmission gear ring (409) and the outer surface of the rotating sleeve (403) in contact with the second support seat (408) are provided with T-shaped ring grooves. A sealing ring (404) is provided on the inner side of the T-shaped ring groove. A sealing ring (404) is also installed in the middle of the first support seat (407), the first drive mechanism protective housing (9), the rotating sleeve (403), the second support seat (408), the rotating sleeve (403), and the support ring (402).

3. The rear-excavation type screw conveyor according to claim 1, characterized in that: The outer wall of the spiral blade of the conveying screw (3) passing through the middle of the rotating sleeve (403) is in contact with the inner wall of the rotating sleeve (403), and the spiral blade of the conveying screw (3) passing through the middle of the rotating sleeve (403) is fixed to the rotating sleeve (403) by welding.

4. The rear-excavation type screw conveyor according to claim 1, characterized in that: The end of the intermediate connecting cylinder (2) that contacts the first drive mechanism protective housing (9) and the end of the discharge connecting cylinder (6) that contacts the second drive mechanism protective housing (10) are provided with a first end connecting ring (8). The two first end connecting rings (8) are respectively fixed to the outside of the first drive mechanism protective housing (9) and the second drive mechanism protective housing (10) by screws.

5. A rear-excavation type screw conveyor according to claim 4, characterized in that: The surfaces of the two first end connecting rings (8) that contact the first drive mechanism protective housing (9) and the second drive mechanism protective housing (10) are provided with annular sealing grooves, and the inner side of the annular sealing grooves is provided with rubber sealing rings (7).

6. A rear-excavation type screw conveyor according to claim 1, characterized in that: Both sides of the gate mounting base (503) are provided with side U-shaped mounting blocks (504), and the electric telescopic rod (502) is installed in the middle of the side U-shaped mounting blocks (504) and connected to the side U-shaped mounting blocks (504) by pins.

7. A rear-excavation type screw conveyor according to claim 1, characterized in that: Gate sealing gaskets (505) are provided at the inner end of the gate sealing end plate (506), in the middle of the gate mounting base (503), and in the middle of the inner wall of the gate sealing end plate (506) and the movable gate (501). The gate sealing gaskets (505) are made of rubber and are injection molded.

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