Center impeller type stirring device for cutter head of shield tunneling machine

Abstract

The utility model belongs to the technical field of urban underground engineering construction, and particularly relates to a shield tunneling machine cutterhead center impeller type stirring device which is used for clay stratum tunneling and is provided with a conventional common cutterhead shield tunneling machine. The utility model provides a shield tunneling machine cutterhead center impeller type stirring device, which solves the problem of cutterhead mud cake aggregation during tunneling in clay stratums, improves muck fluidity by adding a stirrer at the rear part of a cutterhead, avoids the risk of manual cleaning in a bin under pressure, and comprises a plurality of hydraulic motors, the hydraulic motor is mounted on the rear side of a mounting hole reserved in a rear partition plate of a cutter head of the shield tunneling machine, and an output shaft of the hydraulic motor penetrates through the mounting hole from back to front; a stirrer is installed at the front end of an output shaft of the hydraulic motor and comprises a plurality of stirring blades distributed in the circumferential direction, and the stirring range of the stirring blades is the range from the center of the cutter head to the cutter head bracket.

Description

Technical Field

[0001] This utility model belongs to the field of urban underground engineering construction technology, and is particularly for construction operations of tunnel boring machines (TBMs) with conventional cutterheads used for excavation in clay strata. Specifically, it relates to a central impeller-type mixing device for the cutterhead of a TBM. Background Technology

[0002] As we all know, the cutterhead is one of the key components of a tunnel boring machine (TBM). The appropriateness of the selection of the cutterhead and cutting tools directly affects the cutting effect and tunneling speed of the TBM, and even the success or failure of the TBM construction.

[0003] With the increasing application of shield tunneling, shield tunneling machines are used more and more frequently in clay strata. However, it is inevitable that problems such as cutterhead mud cake accumulation and poor soil fluidity will occur in clay strata. The most serious problem is that mud cake easily accumulates in the area from the center of the cutterhead to the cutterhead corbel, resulting in low tunneling efficiency of the shield tunneling machine. If pressurized entry is used to manually clean the cutterhead mud cake, the operation risk is extremely high. Utility Model Content

[0004] This utility model provides a central impeller-type mixing device for the cutterhead of a tunnel boring machine, which solves the problem of mud cake accumulation on the cutterhead during tunneling in clay strata. By adding a mixer at the rear of the cutterhead, the fluidity of the excavated soil is improved, avoiding the risk of manual cleaning during pressurized entry into the chamber.

[0005] This utility model is achieved through the following technical solution:

[0006] A central impeller-type mixing device for a tunnel boring machine cutterhead includes multiple hydraulic motors. The hydraulic motors are installed on the rear side of the mounting holes reserved in the rear partition of the tunnel boring machine cutterhead, and the output shafts of the hydraulic motors pass through the mounting holes from back to front.

[0007] An agitator is installed at the front end of the output shaft of the hydraulic motor. The agitator includes multiple circumferentially distributed agitator blades, and the agitation range of the agitator blades is from the center of the cutter head to the cutter head bracket.

[0008] Furthermore, the stirring blades include alternating first stirring blades and second stirring blades, the first stirring blades being L-shaped blades, and a triangular plate being fixed to one end of the first stirring blade away from the center of the cutter head.

[0009] The second stirring blade is a straight blade, and a square plate is fixed to one end of the second stirring blade away from the center of the blade. The square plate forms an angle of 20°-60° with the plane where the stirring range is located.

[0010] Furthermore, the agitator also includes a rotating shaft, the agitating blades are evenly distributed circumferentially on the outer circumference of the rotating shaft, the rear end of the rotating shaft is provided with an agitator flange, the front end of the output shaft of the hydraulic motor is provided with a connecting flange, and the connecting flange is fixedly connected to the agitator flange as a whole.

[0011] Furthermore, both the square and triangular plates are made of alloy materials.

[0012] Furthermore, there are two of each of the first and second stirring blades.

[0013] Furthermore, the inlet and outlet ports of the hydraulic motor are connected to the hydraulic pump station via hydraulic pipelines through the central rotating body of the cutter head.

[0014] The beneficial effects achieved by this utility model compared with the prior art are as follows:

[0015] 1. Multiple hydraulic motors are installed on the rear side of the pre-reserved mounting holes in the rear partition of the shield machine cutterhead. An agitator is installed at the front end of the output shaft of the hydraulic motor. The agitator blades have a mixing range from the center of the cutterhead to the cutterhead bracket.

[0016] When the tunnel boring machine is excavating in clay strata, the mixing blades can improve the fluidity of the excavated soil, prevent mud cake from accumulating, and eliminate the risk of manual cleaning under pressure.

[0017] 2. The first mixing blade is an L-shaped blade, and a triangular plate is fixed at the end of the first mixing blade away from the center of the cutterhead. This design greatly increases the mixing area and improves the fluidity of the slag.

[0018] 3. The second mixing blade is a straight blade. A square plate is fixed to the end of the second mixing blade away from the center of the cutterhead. The straight blade reduces its torque by changing the resistance it experiences in the mud, thus reducing the size of the blade. Under the premise of ensuring sufficient mixing by the four mixing blades, reducing the torque can reduce the failure rate and energy consumption of the mixing device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the shield machine cutterhead center impeller-type mixing device installed on the cutterhead according to the present invention;

[0020] Figure 2 This is a schematic diagram showing the position of the central impeller-type stirring device of the tunnel boring machine cutterhead according to the present invention on the cutterhead;

[0021] Figure 3 This is a front view of the stirrer described in this utility model;

[0022] Figure 4 This is a side view of the stirrer described in this utility model;

[0023] In the diagram: 1. Tunnel boring machine cutterhead, 2. Cutterhead bracket, 3. Mixer, 301. Mixer flange, 302. L-shaped blade, 303. Straight blade, 304. Square plate, 305. Triangular plate, 4. Bolt, 5. Hydraulic motor, 6. Cutterhead rear partition hole, 7. Hydraulic pipeline, 8. Hydraulic pump station, 9. Control circuit, 10. Tunnel boring machine operator's cab, 11. Central rotating body. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do 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, they should not be construed as limitations on the utility model.

[0026] To adapt to tunneling in clay strata and prevent mud cake from accumulating on the cutterhead, such as Figures 1-4 As shown in the figure, this embodiment discloses a central impeller-type mixing device for a tunnel boring machine cutterhead, which mainly includes four hydraulic motors 5 and four agitators 3.

[0027] To facilitate the installation of the above structure, four mounting holes 6 are pre-drilled in the rear partition of the cutterhead 1 of the tunnel boring machine (the number of mounting holes is determined based on the central space of the cutterhead and the size of the impeller-type agitator 3; in this embodiment, four are sufficient). The hydraulic motor 5 is installed on the rear side of the pre-drilled mounting holes in the rear partition of the cutterhead 1 of the tunnel boring machine and fixedly connected by bolts 4. Sealing gaskets are used to seal the mounting holes 6, ensuring good sealing and withstanding the high pressure inside the excavation chamber, thus preventing the leakage of slurry. The output shaft of the hydraulic motor 5 passes through the mounting holes 6 from back to front, and a connecting flange is fixedly installed at the front end of the output shaft of the hydraulic motor 5.

[0028] The agitator 3 includes a rotating shaft and four agitator blades. The agitator blades are evenly distributed circumferentially on the outer circumference of the rotating shaft. An agitator flange 301 is provided at the rear end of the rotating shaft. The connecting flange and the agitator flange 301 are fixedly connected as one unit by a bolt assembly. This design facilitates the disassembly and replacement of the agitator 3 later. In this embodiment, the agitation range of the agitator blades is from the center of the cutter head to the cutter head bracket 2.

[0029] In this embodiment, the stirring blades include two first stirring blades and two second stirring blades. The first stirring blades and the second stirring blades are alternately distributed. The first stirring blade is an L-shaped blade 302, and a triangular plate 305 made of alloy material is fixed to the end of the first stirring blade away from the center of the cutter head. The second stirring blade is a straight blade 303, and a square plate 304 made of alloy material is fixed to the end of the second stirring blade away from the center of the cutter head. The square plate forms a 45° angle with the plane of the stirring area.

[0030] The hydraulic motor 5's inlet and outlet ports are connected to the hydraulic pump station 8 via hydraulic pipelines 7 through the central rotating body 11 of the cutterhead, preventing the hydraulic pipelines 7 from becoming entangled during cutterhead rotation. The control line 9 of the hydraulic pump station is connected to the tunnel boring machine (TBM) operator's cab 10, allowing the operator to control the start and stop of the mixing device. The mixing device has automatic and manual modes. In automatic mode, it starts and stops in sync with the cutterhead, while in manual mode, the operator controls its operation. When the TBM is tunneling through clay strata, starting the mixing device activates the rotating blades, improving the fluidity of the excavated soil, preventing mud cake buildup, and eliminating the risk of manual cleaning under pressure.

Claims

1. A central impeller-type mixing device for a tunnel boring machine cutterhead, characterized in that, It includes multiple hydraulic motors, which are installed on the rear side of the pre-reserved mounting holes in the rear bulkhead of the tunnel boring machine cutterhead, and the output shaft of the hydraulic motor passes through the mounting holes from back to front; An agitator is installed at the front end of the output shaft of the hydraulic motor. The agitator includes multiple circumferentially distributed agitator blades, and the agitation range of the agitator blades is from the center of the cutter head to the cutter head bracket.

2. The shield machine cutterhead center impeller-type mixing device according to claim 1, characterized in that, The stirring blades include alternating first stirring blades and second stirring blades. The first stirring blade is an L-shaped blade, and a triangular plate is fixed to one end of the first stirring blade away from the center of the cutter head. The second stirring blade is a straight blade, and a square plate is fixed to one end of the second stirring blade away from the center of the blade. The square plate forms an angle of 20°-60° with the plane where the stirring range is located.

3. The shield machine cutterhead center impeller-type mixing device according to claim 2, characterized in that, The agitator also includes a rotating shaft, and the agitating blades are evenly distributed circumferentially on the outer circumference of the rotating shaft. The rear end of the rotating shaft is provided with an agitator flange, and the front end of the output shaft of the hydraulic motor is provided with a connecting flange. The connecting flange is fixedly connected to the agitator flange as a whole.

4. The shield machine cutterhead center impeller-type mixing device according to claim 2, characterized in that, Both the square and triangular plates are made of alloy materials.

5. The shield machine cutterhead center impeller-type mixing device according to any one of claims 2-4, characterized in that, The number of the first stirring blade and the second stirring blade are both two.

6. The shield machine cutterhead center impeller-type mixing device according to any one of claims 2-4, characterized in that, The hydraulic motor's inlet and outlet ports are connected to the hydraulic pump station via hydraulic pipelines through the central rotating body of the cutterhead.

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