A double screw conveyor for a tunneling machine

Abstract

The utility model relates to tunneling equipment technical field and disclose a kind of double screw conveyors of shield machine, including shield machine shell and primary screw machine, the discharge port of primary screw machine is provided with secondary screw machine, and connecting mechanism is provided between the discharge port of primary screw machine and the inlet of secondary screw machine;The connecting mechanism includes the first sleeve board of being fixedly sleeved on the inlet of secondary screw machine.The inclined insertion of primary screw machine passes through pressure wall and baffle and enters the front shield space of shield machine shell, the inlet of primary screw machine and secondary screw machine are connected into an organic whole by connecting mechanism, primary screw machine and secondary screw machine can be independently controlled, and each level can be according to working condition and carry out normal rotation, reverse rotation, speed regulation etc., and form effective soil plug resistance in primary screw machine and secondary screw, control the pressure of excavation bin, improve soil plug pressure capacity, reduce the situation of spiral conveyor outlet spouting.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring equipment technology, specifically a double-helix conveyor for a shield tunneling machine. Background Technology

[0002] A tunnel boring machine (TBM) is a tunnel excavation device that integrates optics, mechanics, electronics, hydraulics, sensing, and information technology. Its basic working principle is that a cylindrical steel assembly advances along the tunnel axis while excavating the soil. The shell of this cylindrical assembly, the shield, provides temporary support for the excavated, unlined tunnel section, withstands the pressure of the surrounding soil layers, and sometimes also withstands groundwater pressure and blocks groundwater from entering. Excavation, soil removal, and lining operations are carried out under the protection of the shield.

[0003] The screw conveyor of the tunnel boring machine is the core soil discharge and earth pressure balance control device of the earth pressure balance tunnel boring machine. It uses the rotation of the screw blades to discharge the soil cut by the cutterhead from the pressurized soil chamber. During the conveying process, a soil plug effect is formed, which causes the pressure in the soil chamber to gradually decrease along the screw conveyor, thereby maintaining the pressure balance between the excavation face and the soil chamber and ensuring the stability of tunnel excavation.

[0004] Traditional tunnel boring machines (TBMs) use a single helical conveyor to discharge excavated soil. However, in complex geological conditions such as water-rich sand layers and fault zones, groundwater is prone to separate from the excavated soil, forming a high-pressure water head. This causes the helical conveyor outlet to gush out, leading to ground subsidence. Furthermore, the single helical soil plug has insufficient pressure-bearing capacity and cannot effectively balance the water and soil pressure at the excavation face. Therefore, a double helical conveyor for TBMs is needed. Utility Model Content

[0005] The purpose of this invention is to provide a double-helix conveyor for a tunnel boring machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a double-helix conveyor for a tunnel boring machine (TBM), comprising a TBM shell and a primary helical conveyor. A secondary helical conveyor is provided at the discharge port of the primary helical conveyor, and a connecting mechanism is provided between the discharge port of the primary helical conveyor and the inlet of the secondary helical conveyor. The connecting mechanism includes a first sleeve plate fixedly fitted onto the inlet of the secondary helical conveyor, a docking groove formed on the first sleeve plate, a rotating slot formed on the docking groove, a second sleeve plate fixedly fitted onto the discharge port of the primary helical conveyor, a rotating plate below the second sleeve plate, a limiting ring fixedly fitted on the rotating plate, a rotating groove rotatably connected to the limiting ring at the bottom of the second sleeve plate, a mating head fixedly fitted at the bottom of the rotating plate, a locking block fixedly fitted on the mating head, the locking block rotatably engaging with the rotating slot, and a detachable connection between the rotating plate and the first sleeve plate achieved by a fixing component.

[0007] Preferably, the fixing component includes a fixing block fixedly disposed on the first sleeve plate, the fixing block having a through hole, a rotating shaft fixedly disposed on the rotating plate, and a flipping block rotatably disposed on the rotating shaft.

[0008] Preferably, the flipping block has a fixing hole, a bolt is inserted into the through hole, the bolt passes through the fixing hole and is threaded to a nut, and a washer is provided between the nut and the fixing block.

[0009] Preferably, the cross-section of the rotating slot is L-shaped, and the cross-section of the rotating groove is T-shaped.

[0010] Preferably, the front shield of the tunnel boring machine is equipped with a cutterhead, and a partition and a pressure wall are installed inside the tunnel boring machine. A support column is provided between the partition and the cutterhead.

[0011] Preferably, both the primary and secondary spiral augers are installed inside the tunnel boring machine (TBM) casing. The primary spiral auger is inserted obliquely through the pressure wall and partition into the front shield space of the TBM casing. The discharge port of the primary spiral auger and the inlet of the secondary spiral auger are connected as one unit by a connecting mechanism.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The dual-helix conveyor of this tunnel boring machine (TBM) enters the front shield space of the TBM shell by obliquely inserting the first-stage helix through the pressure wall and partition. The discharge port of the first-stage helix and the inlet of the second-stage helix are connected as one unit by a connecting mechanism. Both the first-stage and second-stage helices can be controlled independently, and each stage can be rotated forward, reversed, and speed adjusted according to the working conditions. Effective soil plug resistance is formed in the first-stage and second-stage helices to control the pressure of the excavation chamber, improve the pressure bearing capacity of the soil plug, and reduce the occurrence of gushing at the outlet of the helix conveyor.

[0014] 2. The double-helix conveyor of this tunnel boring machine (TBM) precisely connects the first and second sets of plates using a docking slot and a connector. Then, the rotating plate is rotated 90 degrees counterclockwise, allowing the locking block to be secured in the rotating slot. Next, the rotating shaft flips the tilting block downwards, aligning the fixing hole with the through hole. Bolts, washers, and nuts are then used to lock and secure the connection, completing the rapid connection of the first and second sets of plates. The bolts on the four fixing components are removed sequentially, and then the rotating plate is rotated 90 degrees clockwise, rotating the locking block to the entrance of the rotating slot. The first and second sets of plates are then separated, completing the rapid disassembly of the secondary helix conveyor. This TBM's double-helix conveyor adopts a modular design, allowing a single-helix TBM to be modified by adding a secondary helix according to project requirements. After project completion, it can be disassembled via a connecting mechanism for reuse, without affecting the original machine's main structure. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a double-helix conveyor for a tunnel boring machine according to an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the first-stage and second-stage screw conveyors in the embodiments of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the connecting mechanism in an embodiment of the present utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the first set of plates in an embodiment of this utility model;

[0019] Figure 5 This is a three-dimensional structural diagram of the second set of plates in an embodiment of this utility model.

[0020] In the diagram: 1. Tunnel boring machine shell; 2. Cutterhead; 3. Diaphragm; 4. Pressure wall; 5. Support column; 6. Primary screw conveyor; 7. Secondary screw conveyor;

[0021] 8. Connecting mechanism; 81. First sleeve plate; 82. Docking groove; 83. Rotating slot; 84. Second sleeve plate; 85. Rotating plate; 86. Limiting ring; 87. Rotating groove; 88. Connecting joint; 89. Locking block;

[0022] 810. Fixing component; 8101. Fixing block; 8102. Through hole; 8103. Bolt; 8104. Washer; 8105. Nut; 8106. Rotating shaft; 8107. Flipping block; 8108. Fixing hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] Combination Figures 1-5 A double-helix conveyor for a tunnel boring machine (TBM) includes a TBM shell 1 and a primary helical conveyor 6. A secondary helical conveyor 7 is installed at the discharge port of the primary helical conveyor 6. A connecting mechanism 8 is provided between the discharge port of the primary helical conveyor 6 and the inlet of the secondary helical conveyor 7. A cutterhead 2 is installed on the front shield of the TBM shell 1. A partition 3 and a pressure wall 4 are installed inside the TBM shell 1. A support column 5 is provided between the partition 3 and the cutterhead 2. Both the primary helical conveyor 6 and the secondary helical conveyor 7 are installed inside the TBM shell 1. The primary helical conveyor 6 is inserted obliquely through the pressure wall 4 and the partition 3 into the front shield space of the TBM shell 1. The discharge port of the primary helical conveyor 6 and the inlet of the secondary helical conveyor 7 are connected as one unit by the connecting mechanism 8.

[0026] Specifically, the primary screw conveyor 6 is inserted obliquely through the pressure wall 4 and the partition 3 into the front shield space of the shield machine shell 1. The discharge port of the primary screw conveyor 6 and the inlet of the secondary screw conveyor 7 are connected as one unit through the connecting mechanism 8. The primary screw conveyor 6 and the secondary screw conveyor 7 can be controlled independently, and each stage can be rotated forward, reversed, and speed adjusted according to the working conditions. Effective soil plug resistance is formed in the primary screw conveyor 6 and the secondary screw conveyor 7 to control the pressure of the excavation chamber, improve the pressure bearing capacity of the soil plug, and reduce the situation of gushing at the outlet of the screw conveyor.

[0027] The connecting mechanism 8 includes a first sleeve plate 81 fixedly sleeved on the feed inlet of the secondary screw conveyor 7. The first sleeve plate 81 has a mating groove 82, and the mating groove 82 has a rotating slot 83 with an L-shaped cross-section. A second sleeve plate 84 is fixedly sleeved on the discharge outlet of the primary screw conveyor 6. A rotating plate 85 is located below the second sleeve plate 84, and a limit ring 86 is fixedly installed on the rotating plate 85. A rotating groove 87 with a T-shaped cross-section is located at the bottom of the second sleeve plate 84, which rotatably connects with the limit ring 86. A mating joint 88 adapted to the mating groove 82 is fixedly installed at the bottom of the rotating plate 85, and a locking block 89 is fixedly installed on the mating joint 88. The locking block 89 connects with the rotating groove 85. The movable slot 83 is rotated and snapped together. The rotating plate 85 and the first sleeve plate 81 are detachably connected by a fixing component 810. The fixing component 810 includes a fixing block 8101 fixedly mounted on the first sleeve plate 81. The fixing block 8101 has a through hole 8102. The rotating plate 85 is fixedly mounted with a rotating shaft 8106. The rotating shaft 8106 is rotatably mounted with a flipping block 8107. The flipping block 8107 has a fixing hole 8108. A bolt 8103 is inserted into the through hole 8102. The bolt 8103 passes through the fixing hole 8108 and is threadedly connected to a nut 8105. A washer 8104 is provided between the nut 8105 and the fixing block 8101.

[0028] Specifically, the first set of plates 81 and the second set of plates 84 are precisely aligned using the mating groove 82 and the connector 88. Then, the rotating plate 85 is rotated 90 degrees counterclockwise, allowing the locking block 89 to be secured within the rotating slot 83. Next, the rotating shaft 8106 is used to flip the flipping block 8107 downwards, aligning the fixing hole 8108 with the through hole 8102. Finally, bolts 8103, washers 8104, and nuts 8105 are used to lock and secure the connection, thus completing the rapid connection of the first set of plates 81 and the second set of plates 84. This is achieved by fixing four... Bolts 8103 on component 810 are removed one by one. Then, rotating plate 85 is rotated 90 degrees clockwise so that the locking block 89 is rotated to the entrance of rotating slot 83. After that, the first set of plates 81 and the second set of plates 84 are separated to complete the quick disassembly of the secondary spiral machine 7. The double spiral machine of this shield machine adopts a modular design, which can modify the single spiral shield machine to add a secondary spiral according to the needs of the project. After the project construction is completed, it can be disassembled through the connecting mechanism 8 for relocation, and this process does not affect the main structure of the original machine.

[0029] In actual operation, the double helix machine of this tunnel boring machine mainly includes a primary helix 6 and a secondary helix 7. The primary helix 6 obliquely inserts through the pressure wall 4 and the partition 3 into the front shield space of the tunnel boring machine shell 1. The discharge port of the primary helix 6 and the inlet of the secondary helix 7 are connected as one unit through the connecting mechanism 8. The primary helix 6 and the secondary helix 7 can be controlled independently, and each stage can be rotated forward, reversed, and speed adjusted according to the working conditions. Effective soil plug resistance is formed in the primary helix 6 and the secondary helix 7 to control the pressure of the excavation chamber. The double helix machine of this tunnel boring machine adopts a modular design, which can modify the single helix tunnel boring machine by adding a secondary helix according to the needs of the project. After the project construction is completed, it can be removed through the connecting mechanism 8 for relocation. This process does not affect the main structure of the original machine.

[0030] When installing the secondary spiral machine 7, first rotate the rotating plate 85 on the second set of plates 84 until the two locking blocks 89 on the connector 88 are aligned with the two inlets of the rotating slot 83 on the first set of plates 81. Then, use the docking groove 82 and the connector 88 to precisely align the first set of plates 81 and the second set of plates 84. After that, rotate the rotating plate 85 counterclockwise by 90 degrees, so that the connector 88 rotates in the docking groove 82, and at the same time, the locking blocks 89 rotate in the rotating slot 83. After the rotation is completed, the locking blocks 89 can be locked in the rotating slot 83, completing the initial fixation of the first set of plates 81 and the second set of plates 84. Then, use the rotating shaft 8106 to flip the flipping block 8107 downwards, so that the flipping block 8107... Align the fixing hole 8108 on the fixing block 8101 with the through hole 8102 on the fixing block 8101. Then insert the bolt 8103 through the through hole 8102 and the fixing hole 8108. Then use the washer 8104 and nut 8105 to lock the bolt 8103. After fixing the four sets of fixing components 810 in sequence, the quick connection of the first set plate 81 and the second set plate 84 can be completed. When disassembling the secondary screw conveyor 7, remove the bolts 8103 on the four fixing components 810 in sequence. Then rotate the rotating plate 85 clockwise by 90 degrees so that the locking block 89 is rotated to the entrance of the rotating slot 83. Then separate the first set plate 81 and the second set plate 84 to complete the quick disassembly of the secondary screw conveyor 7.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-helix conveyor for a tunnel boring machine, comprising a tunnel boring machine shell (1) and a primary helical conveyor (6), characterized in that: A secondary screw conveyor (7) is provided at the discharge port of the primary screw conveyor (6), and a connecting mechanism (8) is provided between the discharge port of the primary screw conveyor (6) and the inlet of the secondary screw conveyor (7); The connecting mechanism (8) includes a first sleeve plate (81) fixedly sleeved on the feed inlet of the secondary screw conveyor (7), the first sleeve plate (81) having a docking groove (82) and a rotating slot (83) having a docking groove (82). A second sleeve plate (84) is fixedly sleeved on the discharge outlet of the primary screw conveyor (6), and a rotating plate (85) is provided below the second sleeve plate (84). A limit ring (86) is fixedly provided on the rotating plate (85). The bottom of the second set plate (84) is provided with a rotating groove (87) that is rotatably connected to the limiting ring (86). The bottom of the rotating plate (85) is fixedly provided with a mating head (88) that is adapted to the mating groove (82). A locking block (89) is fixedly provided on the mating head (88). The locking block (89) is rotatably engaged with the rotating locking groove (83). The rotating plate (85) and the first set plate (81) are detachably connected by a fixing component (810).

2. The double-helix conveyor for a tunnel boring machine according to claim 1, characterized in that: The fixing component (810) includes a fixing block (8101) fixedly disposed on the first sleeve plate (81), the fixing block (8101) having a through hole (8102), the rotating plate (85) having a rotating shaft (8106) fixedly disposed on the rotating shaft (8106), and a flipping block (8107) rotatably disposed on the rotating shaft (8106).

3. The double-helix conveyor for a tunnel boring machine according to claim 2, characterized in that: The flipping block (8107) has a fixing hole (8108), and a bolt (8103) is inserted into the through hole (8102). The bolt (8103) passes through the fixing hole (8108) and is threaded with a nut (8105). A washer (8104) is provided between the nut (8105) and the fixing block (8101).

4. The double-helix conveyor for a tunnel boring machine according to claim 1, characterized in that: The rotating slot (83) has an L-shaped cross-section, and the rotating groove (87) has a T-shaped cross-section.

5. A double-helix conveyor for a tunnel boring machine according to claim 1, characterized in that: The shield machine shell (1) is equipped with a cutterhead (2) at the front. The shield machine shell (1) is equipped with a partition (3) and a pressure wall (4) respectively. A support column (5) is provided between the partition (3) and the cutterhead (2).

6. The double-helix conveyor for a tunnel boring machine according to claim 5, characterized in that: The primary spiral machine (6) and the secondary spiral machine (7) are both installed inside the shield machine shell (1). The primary spiral machine (6) is inserted obliquely through the pressure wall (4) and the partition (3) into the front shield space of the shield machine shell (1). The discharge port of the primary spiral machine (6) and the inlet of the secondary spiral machine (7) are connected as one unit through the connecting mechanism (8).

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