Shield machine cutterhead cleaning device

Abstract

The present invention discloses a shield machine cutterhead cleaning device, wherein a sealing device is arranged at the front end of a propulsion frame, a power head assembly is arranged at the rear end, a drill rod is arranged in a pipe hole of a support pipe through the sealing device, an ultra-high pressure rotary spray nozzle is arranged at the front end of the drill rod close to the cutterhead, the tail end of the drill rod is clamped on the power head assembly, and the power head assembly is connected to an ultra-high pressure pump station through a joint; a support foot is arranged at the bottom of the propulsion frame. The present invention arranges the drill rod on the propulsion frame slidably, an ultra-high pressure rotary spray nozzle is arranged at the front end of the drill rod, and a power head assembly is arranged at the rear end of the drill rod. When the shield machine stops working, the power head assembly pushes the drill rod to the cutterhead to clean the cutterhead surface. When the shield machine is working, the power head assembly drives the drill rod to retreat, and the ultra-high pressure rotary spray device is hidden in the channel inside the support pipe. The overall structure of the device is in the shape of a long strip, the structure is compact, the space required for installation and use is small, and the operation is simple and flexible.

Description

Technical Field

[0001] The invention relates to the field of tunnel engineering mechanical equipment, in particular to a shield machine cutter head cleaning device. Background Art

[0002] A shield machine is a tunnel boring machine that uses the shield method. The basic working principle of a shield machine is that a cylindrical steel component advances forward along the axis of the tunnel while excavating the soil. The shell of the cylindrical component is the shield, which plays a temporary support role for the excavated tunnel section that has not yet been lined, bearing the pressure of the surrounding soil layers and sometimes also the groundwater pressure. Excavation, soil discharge, lining and other operations are all carried out under the cover of the shield.

[0003] The cutter of a shield machine is a very important component. The reasonable selection, use and maintenance of the cutter directly determines the quality, progress and cost of the excavation project. When the shield machine is excavating the clay layer, the clay accumulates on the cutterhead and forms a mud cake, causing the torque of the shield machine cutterhead to increase continuously, the temperature of the cutterhead bearing to increase too fast, and the advancement speed to decrease. This may cause the bottom surface to deform more and even cause a ground collapse accident, seriously affecting the safety of the shield construction. At present, the method of dealing with the cutterhead mud cake is mainly to break it manually under normal pressure or under pressure, but this method has a greater construction risk.

[0004] For example, Chinese invention patent CN205762542U discloses a device for cleaning under pressure. The cleaning device is installed on the earth bin partition of the shield machine through a ball socket. The ball core and the ball socket are ball-hinged. The cleaning pipe passes through the channel in the ball core to flush the shield machine cutter head. The flushing angle of the cleaning pipe can be adjusted by swinging the cleaning pipe. In actual use, construction personnel need to enter the air cushion bin to operate the cleaning device installed on the earth bin partition. The air pressure in the air cushion bin is relatively high, which will affect human health. In addition, the cleaning device needs to swing the cleaning pipe to adjust the flushing angle, which requires a relatively large operating space, so the implementation in tunnels with smaller spaces is limited. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned existing shield machine cutter head cleaning devices, such as requiring a large operating space, being unable to be used in narrow tunnels, and being detrimental to human health due to pressure, the applicant provides a shield machine cutter head cleaning device with a reasonable structure, which requires a small operating space and allows construction workers to operate outside the air cushion chamber to avoid being affected by the air pressure inside the air cushion chamber.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A shield machine cutterhead cleaning device, a sealing device is arranged at the front end of a propulsion frame, a power head assembly is arranged at the rear end, a drill rod is arranged in a pipe hole of a support pipe through the sealing device, an ultra-high pressure rotary jet nozzle is arranged at the front end of the drill rod close to the cutterhead, the rear end of the drill rod is clamped on the power head assembly, and the power head assembly is connected to an ultra-high pressure pump station through a joint.

[0008] As a further improvement of the above technical solution:

[0009] The support pipe is a reserved pipe of the air cushion chamber.

[0010] The sealing device is fixedly connected to the support tube.

[0011] A plurality of sealing rings are arranged in the sealing device.

[0012] A pressure plate is arranged between the support of the sealing device and the support tube, and a sealing ring is arranged at the contact surface between the pressure plate and the support.

[0013] A plurality of sealing rings and dustproof rings are arranged inside the support of the sealing device.

[0014] An end cover is fixedly arranged at one end of the support of the sealing device, and a bearing is arranged at the connection between the two.

[0015] A plurality of slips are arranged on the end cover, and a clamping device is arranged on the slips.

[0016] The power head assembly is connected to a plurality of ultra-high pressure pumping stations, and the plurality of ultra-high pressure pumping stations are arranged in parallel.

[0017] A one-way valve is provided between each ultra-high pressure pump station and the power head assembly.

[0018] The beneficial effects of the present invention are as follows:

[0019] The present invention arranges the drill rod slidably on the propulsion frame, an ultra-high pressure rotary spray nozzle is arranged at the front end of the drill rod, and a power head assembly is arranged at the rear end of the drill rod. When the shield machine stops working, the power head assembly pushes the drill rod to the cutter head to clean the cutter head surface. When the shield machine is working, the power head assembly drives the drill rod backward, and the ultra-high pressure rotary spray device is hidden in the channel inside the support pipe. The overall structure of the device is long and compact, the space required for installation and use is small, and the operation is simple and flexible.

[0020] The present invention provides a sealing device at the front end of the propulsion frame, and the drill rod passes through the sealing device. The multiple shafts in the sealing device use sealing rings to seal the pressure of the cutter disc working chamber, so that the drill rod and the power head assembly in the rear half can work under normal pressure. Therefore, the staff can operate the power head assembly under normal pressure outside the air cushion chamber without entering the air cushion chamber for processing, thereby avoiding the influence of the air pressure in the air cushion chamber.

[0021] The present invention utilizes existing equipment for improvement and installs the existing drilling tools on the reserved pipeline of the air cushion chamber sealing partition through a sealing device. There is no need to upgrade the installation interface of the shield machine, and high-pressure rotary spray cleaning operations on the cutter head of the shield machine can be achieved. The present invention has strong environmental adaptability and saves the cost of shield machine equipment modification. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the present invention, at which time the cleaning head is in a standby state and has not been fed in.

[0023] Figure 2 A cross-sectional view of the sealing device.

[0024] Figure 3 This is a schematic diagram of the present invention in use, where the front flushing head is moved to the working position and starts spraying and cleaning.

[0025] In the figure: 1. air cushion chamber; 2. support pipe; 3. pipe hole; 4. sealing device; 5. drill pipe; 6. power head assembly; 7. joint; 8. propulsion frame; 9. support leg; 10. pump station assembly; 11. ultra-high pressure pump station; 12. one-way valve; 13. high-pressure water flow; 41. pressure plate; 42. sealing ring; 43. support; 44. dust ring; 45. shaft sealing ring; 46. bearing; 47. end cover; 48. clamping device; 49. slip. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, the present invention is provided with a sealing device 4 at the front end of the long strip propulsion frame 8, and a power head assembly 6 at the rear end. A plurality of drill rods 5 are connected in series and then pass through the sealing device 4. The tail end of the drill rod 5 is clamped on the power head assembly 6. The rear end of the power head assembly 6 is connected to a joint 7. The drill rod 5 can move along the propulsion frame 8 driven by the power head assembly 6. The drill rod 5 passes through the sealing device 4 and enters the reserved pipeline of the air cushion chamber 1, and is located in the pipe hole 3 of the support pipe 2. An ultra-high pressure rotary spray nozzle is provided at the front end of the drill rod 5. When the cutter disc is in the shield working state, the ultra-high pressure rotary spray nozzle on the drill rod 5 retreats to the non-rotating area of ​​the air cushion chamber 1; when the cutter disc needs to be cleaned and is in the shield stopping state, the power head assembly 6 pushes the drill rod 5, and the ultra-high pressure rotary spray nozzle extends to the surface close to the cutter disc, and the ultra-high pressure nozzle rotates and sprays to clean the cutter disc tools. The present invention symmetrically arranges four legs 9 at the bottom of the propulsion frame 8 to support the propulsion frame 8. Each leg 9 can be individually adjusted in height, so that the propulsion frame 8 can be adjusted on an uneven installation surface to ensure that the propulsion frame 8 remains in a horizontal state.

[0028] like Figure 2As shown, the support 43 of the sealing device 4 is fixedly connected to the support tube 2, a pressure plate 41 is provided between the end surface of the support 43 and the end surface of the support tube 2, and a sealing ring 42 is provided at the contact surface between the pressure plate 41 and the support 43. The other end of the support 43 is connected to the end cover 47 through a fastener, and a bearing 46 is provided on the inner step hole at the connection between the support 43 and the end cover 47. A circle of dust rings 44 and a plurality of shaft sealing rings 45 are sequentially provided inside the support 43 from front to back. In this example, two shaft sealing rings 45 are provided. When the drill rod 5 passing through the sealing device 4 is pushed or rotated, the multiple shaft sealing rings 45 in the sealing device 4 seal the pressure of the cutter head working chamber, isolate the front and rear pressure difference of the drill rod 5, and enable the power head assembly 6 to work under normal pressure. The end cover 47 is provided with a plurality of slips 49, two slips 49 in this example, each slip 49 is provided with a clamping device 48, the clamping device 48 can be a manually adjustable clamp or a hydraulic clamp. The clamping device 48 provides a clamping force to the slips 49 to overcome the axial thrust generated by the water pressure in front of the shield, so as to prevent the drill rod 5 from being pushed out by the pressure in the hole when loading and unloading the drill rod 5.

[0029] like Figure 3 As shown, the power head assembly 6 and the propulsion frame 8 of the present invention are respectively connected to the pump station assembly 10, and a plurality of ultra-high pressure pump stations 11 are connected in parallel and connected to the power head assembly 6 through a connector 7. In this embodiment, two ultra-high pressure pump stations 11 are connected in parallel to provide a high-pressure water source, and a one-way valve 12 is arranged between each ultra-high pressure pump station 11 and the power head assembly 6 to prevent the backflow of high-pressure water.

[0030] When the present invention works, Figure 1 As shown, when the cutterhead is in the shield working state, the control circuit is interlocked with the shield machine circuit, and the ultra-high pressure jet nozzle on the drill rod 5 retreats to the non-rotating area of ​​the air cushion chamber 1 to avoid interfering with the cutterhead shield operation; Figure 3 As shown, when the cutterhead is in the shield stop state, the clamping device 48 is adjusted to make the slip 49 release the drill rod 5, the power head assembly 6 pushes the drill rod 5 to the end face close to the cutterhead, and the pushing pressure does not exceed the safety setting value. The power head assembly 6 drives the drill rod 5 and the ultra-high pressure rotary spray nozzle to rotate, and the pump station assembly 10 is connected, and the ultra-high pressure pump station 11 is turned on. After the water of the ultra-high pressure pump station 11 overcomes the spring force of the one-way valve 12, it supplies water to the ultra-high pressure rotary spray nozzle through the power head assembly 6 and the drill rod 5. The ultra-high pressure nozzle rotates and sprays, and the ultra-high pressure water flow 13 cleans the tools on the cutterhead, and the cutterhead is rotated to clean the tools at various angles. After the cutterhead is cleaned, the ultra-high pressure pump station 11 is closed, the power head assembly 6 drives the drill rod 5 to retreat to the position where the ultra-high pressure rotary spray nozzle is hidden in the end face of the non-rotating area of ​​the air cushion chamber 1, and the pump station assembly 10 is closed, and the clamping device 48 is adjusted to make the slip 49 clamp the drill rod 5.

[0031] The above description is an explanation of the present invention, not a limitation of the present invention. The present invention may be modified in any form without violating the spirit of the present invention.

Claims

1. A shield machine cutterhead cleaning device, characterized in that: A sealing device (4) is provided at the front end of the propulsion frame (8), and a power head assembly (6) is provided at the rear end. The drill rod (5) is arranged in the tube hole (3) of the support tube (2) through the sealing device (4). The drill rod (5) passes through the sealing device (4) and is located in the tube hole (3) of the support tube (2). When the cutter head is in a shield state, the drill rod (5) retreats to the non-rotating area of ​​the air cushion chamber (1). A plurality of sealing rings (45) are provided in the sealing device (4), and a plurality of sealing rings (45) and dust rings (44) are provided in a support (43) of the sealing device (4). An end cover (47) is fixedly provided at one end of the support (43) of the sealing device (4), and the two are connected. A bearing (46) is provided at the joint; an ultra-high pressure jet nozzle is provided at the front end of the drill rod (5) close to the cutter disc; the rear end of the drill rod (5) is clamped on the power head assembly (6); the power head assembly (6) is connected to the ultra-high pressure pump station (11) through a joint (7); the drill rod (5) can move along the propulsion frame (8) driven by the power head assembly (6); when the cutter disc is in a shield stopping state, the power head assembly (6) propels the drill rod (5) close to the end face of the cutter disc; the power head assembly (6) drives the drill rod (5) and the ultra-high pressure jet nozzle to rotate; and the ultra-high pressure pump station (11) supplies water to the ultra-high pressure jet nozzle through the power head assembly (6) and the drill rod (5).

2. The shield machine cutterhead cleaning device according to claim 1, characterized in that: The support pipe (2) is a reserved pipe of the air cushion chamber (1).

3. The shield machine cutterhead cleaning device according to claim 1, characterized in that: The sealing device (4) is fixedly connected to the support tube (2).

4. The shield machine cutterhead cleaning device according to claim 1, characterized in that: A pressure plate (41) is provided between the support seat (43) of the sealing device (4) and the support tube (2), and a sealing ring is provided at the contact surface between the pressure plate (41) and the support seat (43).

5. The shield machine cutterhead cleaning device according to claim 1, characterized in that: A plurality of slips (49) are arranged on the end cover (47), and a clamping device (48) is arranged on the slips (49).

6. The shield machine cutterhead cleaning device according to claim 1, characterized in that: The power head assembly (6) is connected to a plurality of ultra-high pressure pump stations (11), and the plurality of ultra-high pressure pump stations (11) are arranged in parallel.

7. The shield machine cutterhead cleaning device according to claim 1 or 6, characterized in that: A one-way valve (12) is provided between each ultra-high pressure pump station (11) and the power head assembly (6).

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