Gas-liquid sealing system of large-scale full-section vertical shaft heading machine and vertical shaft heading machine

Abstract

The invention relates to a gas-liquid sealing system of a large-scale full-section vertical shaft heading machine and the vertical shaft heading machine, and the gas-liquid sealing system comprises a packing sealing assembly and a dredging sealing assembly which are sequentially arranged in a gap between an upper end cover and a wear-resistant sleeve of the heading machine from top to bottom, the dredging sealing assembly comprises a mud umbrella fixed on the wear-resistant sleeve and a mud baffle fixed on the upper end cover, and a flow guide groove for discharging mud out of the upper end cover is formed in the position, corresponding to the bottom of the mud umbrella, of the upper end cover; the mud guard is arranged in the mud umbrella in a covering mode and comprises a horizontal ring part fixed to the upper end cover and a vertical ring part arranged on the periphery of the abrasion-resistant sleeve in a sleeving mode, and the upper edge of the horizontal ring part abuts against the lower edge of the mud umbrella to form end face sealing. The mud sealing device is used for greatly improving the mud sealing level between the rotating part and the fixed part in the heading machine.

Description

Technical Field

[0001] The invention relates to the technical field of large-scale tunneling equipment, in particular to a gas-liquid sealing system of a large-scale full-section vertical shaft tunneling machine and the vertical shaft tunneling machine. Background Art

[0002] In the operation of large-scale full-section shaft boring machines, a large amount of compressed air can be injected into the mud to cause changes in the density of different areas of the mud, resulting in mud pressure differences to achieve mud reverse circulation, so that the rock slag cut by the drilling rig can be moved along with the mud. Figure 3 As shown, the defense line shown by the longitudinal arrow goes from the wear-resistant sleeve 7 from bottom to top and passes through the through hole in the middle of the connecting plate 8 to return to the ground.

[0003] In the process of the slag discharge slurry returning to the ground, how to set the slurry seal between the rotating part (wear-resistant sleeve 7) and the fixed part (upper end cover 2 and connecting plate 8) is a difficult problem. Figure 3 A conventional structure for sealing mud slag is shown, in which a mud seal 11 is provided between the wear-resistant sleeve 7 and the upper end cover 2 and the connecting plate 8 to prevent the mud from flowing into the gap between the bottom of the connecting plate 8 and the top of the wear-resistant sleeve 7 along the horizontal arrow in the figure, and then invading the compressed air seal 1 below along the gap between the outer edge of the wear-resistant sleeve 7 and the inner edge of the upper end cover 2. However, in this structure, since the mud contains a large number of particles, the mud seal 11 wears very quickly, which can easily cause the mud seal 11 to fail. After the mud seal 11 fails, it invades the compressed air seal 1, causing the compressed air to fail. It can even further erode the lubricating oil seal below, causing the entire drive device to enter the mud, resulting in the shutdown or failure of the drive device. Summary of the invention

[0004] The present invention aims to provide a gas-liquid sealing system of a large-scale full-section vertical shaft boring machine and the vertical shaft boring machine, which greatly improves the mud sealing level between the rotating parts and the fixed parts in the boring machine.

[0005] In order to solve the above technical problems, the specific scheme adopted by the present invention is: a gas-liquid sealing system of a large-scale full-section vertical shaft tunneling machine, including a packing seal assembly and a drainage seal assembly which are arranged in the gap between the upper end cover and the wear-resistant sleeve of the tunneling machine from top to bottom, the drainage seal assembly includes a mud umbrella fixed on the wear-resistant sleeve and a mud guard fixed on the upper end cover, a guide groove for mud to be discharged from the upper end cover is provided on the upper end cover corresponding to the bottom position of the mud umbrella, the mud guard cover is arranged in the mud umbrella and includes a horizontal ring portion fixed on the upper end cover and a vertical ring portion sleeved on the outer periphery of the wear-resistant sleeve, the upper edge of the horizontal ring portion abuts against the lower edge of the mud umbrella to form an end face seal.

[0006] Preferably, the packing seal assembly includes a packing body and a pressure cover located below the packing body, a plurality of compression bolts which are slidably penetrated on the pressure cover and are threadedly fixed to the upper end cover, and a spring is also sleeved on the compression bolts, and the spring is used to push the pressure cover to apply pressure toward the packing body.

[0007] Preferably, there are a plurality of filler bodies, and all the filler bodies are distributed in a close fit along the longitudinal direction of the wear-resistant sleeve.

[0008] Preferably, a guide wear-resistant belt is provided in the gap between the upper end cover and the wear-resistant sleeve and between the drainage seal assembly and the compressed air seal of the tunnel boring machine.

[0009] Preferably, the guide wear-resistant belt is made of polytetrafluoroethylene and bronze powder.

[0010] Preferably, a mud combination seal is provided in the gap between the upper end cover and the wear-resistant sleeve, and between the drainage seal assembly and the compressed air seal of the tunnel boring machine. The mud combination seal includes a Z-shaped sealing ring filled with polytetrafluoroethylene material and an O-shaped rubber ring sleeved on the outer periphery of the Z-shaped sealing ring. The Z-shaped sealing ring is sleeved on the wear-resistant sleeve, and the outer edge of the O-shaped sealing ring abuts against the upper end cover.

[0011] Preferably, the bottom of the guide groove is inclined downward.

[0012] Preferably, the horizontal ring portion is fixed to the top of the bottom of the guide groove by fastening bolts.

[0013] A large full-section vertical shaft boring machine has a gas-liquid sealing system of any of the above large full-section vertical shaft boring machines.

[0014] The present invention adopts a combination of a packing seal assembly and a drainage seal assembly to produce "blocking" and "draining" respectively, which greatly improves the sealing level between the fixed parts and the rotating parts of the tunnel boring machine, and effectively reduces the risk of mud entering the compressed air seal and the lubrication seal during the tunneling operation, thereby ensuring the normal operation of the tunnel boring machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a gas-liquid sealing system of a large full-section vertical shaft boring machine of the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure of part A;

[0017] Figure 3 It is a schematic diagram of the structure of the gas-liquid sealing part of a conventional tunnel boring machine;

[0018] Markings in the figure: 1. Compressed air seal, 2. Upper end cover, 3. Mud combination seal, 4. Guide groove, 5. Diversion seal assembly, 501. Fastening bolts, 502. Mud guard, 503. Mud umbrella, 6. Packing seal assembly, 601. Spring, 602. Pressure cover, 603. Crimp bolts, 604. Packing body, 7. Wear-resistant sleeve, 8. Connecting plate, 9. Guide wear-resistant belt, 10. End face seal, 11. Mud seal. DETAILED DESCRIPTION

[0019] A large full-section vertical shaft boring machine of the present invention has the following features: Figure 1 The gas-liquid sealing system shown. The gas-liquid sealing system mainly includes a packing seal assembly 6, a drainage seal assembly 5, a guide wear-resistant belt 9 and a mud combination seal 3, which are arranged in the gap between the upper end cover 2 and the wear-resistant sleeve 7 of the tunnel boring machine from top to bottom, and the mud combination seal 3 is located above the compressed air seal 1 of the tunnel boring machine. The present invention is implemented by combining multiple sealing methods and produces a method that combines "blocking" and "draining", which greatly reduces the risk of leakage failure of the mud seal 11. The following combination Figure 2 Each sealing position is described separately:

[0020] The packing seal assembly 6 includes a multi-ring packing body 604 which is sleeved between the outer periphery of the wear-resistant sleeve 7 and the inner periphery of the inner hole of the upper end cover 2 in the longitudinal direction. A gland 602 is also provided below the packing body 604. The gland 602 is provided with vertically distributed through holes, and a compression bolt 603 is slidably penetrated through the through holes. The threaded section of the compression bolt 603 is screwed with a screw hole provided on the upper end cover 2, and the screw head is located below the gland 602. A spring 601 in a compressed state is sleeved between the screw head and the gland 602. Thus, the spring 601 pushes the gland 602 upward, and the gland 602 compresses the packing body 604, ensuring that the packing body 604 always bears a certain pressure and deforms, ensuring the sealing of the packing body 604, and preventing the mud flowing upward from the wear-resistant sleeve 7 from entering the gap between the upper edge of the wear-resistant sleeve 7 and the lower edge of the connecting plate 8, and then further downward into the gap between the outer edge of the wear-resistant sleeve 7 and the inner edge of the inner hole of the upper end cover 2 and invading the compressed air seal 1 located below. At the same time, the use of the spring 601 to apply the pre-tightening force also reduces the work of the staff to frequently tighten the compression bolt 603.

[0021] The drainage seal assembly 5 includes a mud umbrella 503 fixed on the wear-resistant sleeve 7 and a mud guard 502 fixed on the upper end cover 2. A guide groove 4 is provided on the outer periphery of the bottom of the mud umbrella 503 on the upper end cover 2. The bottom of the guide groove 4 is inclined to facilitate the mud flowing through the outside of the mud umbrella 503 to be further discharged from the upper end cover 2 through the guide groove 4. The mud guard 502 has a T-shaped cross section and includes a horizontal ring portion fixed to the upper end cover 2 by fastening bolts 501 and a vertical ring portion covered on the outer periphery of the wear-resistant sleeve 7. The mud guard 502 is integrally covered in the mud umbrella 503, and the upper edge of the outer peripheral portion of the horizontal ring portion thereof abuts against the bottom of the outer edge of the mud umbrella 503 to form an end face seal 10. On this basis, even if the packing seal assembly 6 leaks slightly, due to the sealing effect of the mud umbrella 503 (tightly sleeved on the shaft of the wear-resistant sleeve 7 and rotating with the wear-resistant sleeve 7), the mud will not flow down along the wear-resistant sleeve 7, but will flow down along the outer inclined surface of the mud umbrella 503, flow to the box cover through the inclined surface of the guide groove 4 of the upper end cover 2, and be discharged to the outside of the upper end cover 2. Even if the mud is deposited and the thickness increases, since the end face seal 10 is provided between the mud umbrella 503 and the fender 502, and the upper edge of the vertical ring portion of the fender 502 is higher than the end face seal 10, it is further difficult for the mud to enter the interior of the fender 502.

[0022] The guide wear-resistant belt 9 is made of polytetrafluoroethylene and bronze powder. The guide wear-resistant belt 9 can withstand a certain radial pressure, and can reduce the failure of the seal caused by the swing of the wear-resistant sleeve 7 due to external force.

[0023] The mud combination seal 3 includes a Z-shaped sealing ring filled with polytetrafluoroethylene material and an O-shaped rubber ring sleeved on the outer periphery of the Z-shaped sealing ring, the Z-shaped sealing ring is sleeved on the wear-resistant sleeve 7, and the outer edge of the O-shaped sealing ring abuts against the upper end cover 2. The mud combination seal 3 is used to further prevent mud from entering the air seal below.

Claims

1. A gas-liquid sealing system for a large full-section vertical shaft boring machine, characterized in that: The invention comprises a packing seal assembly (6) and a drainage seal assembly (5) which are arranged in sequence from top to bottom in the gap between the upper end cover (2) and the wear-resistant sleeve (7) of the tunnel boring machine. The drainage seal assembly (5) comprises a mud umbrella (503) fixed on the wear-resistant sleeve (7) and a mud guard (502) fixed on the upper end cover (2). A guide groove (4) for mud to be discharged from the upper end cover (2) is provided at a position corresponding to the bottom of the mud umbrella (503) on the upper end cover (2). The mud guard (502) is covered in the mud umbrella (503) and comprises a horizontal ring portion fixed on the upper end cover (2) and a vertical ring portion sleeved on the outer periphery of the wear-resistant sleeve (7). The upper edge of the horizontal ring portion contacts the lower edge of the mud umbrella (503) to form an end face seal (10).

2. The gas-liquid sealing system of a large full-face shaft boring machine according to claim 1, characterized in that: The packing seal assembly (6) includes a packing body (604) and a pressure cover (602) located below the packing body (604). A plurality of compression bolts (603) that are screwed and fixed to the upper end cover (2) are slidably inserted into the pressure cover (602). A spring (601) is also sleeved on the compression bolts (603). The spring (601) is used to push the pressure cover (602) toward the packing body (604) to apply pressure.

3. The gas-liquid sealing system of a large full-face shaft boring machine according to claim 2, characterized in that: There are a plurality of filler bodies (604), and all the filler bodies (604) are distributed in a close fit along the longitudinal direction of the wear-resistant sleeve (7).

4. The gas-liquid sealing system of a large full-face shaft boring machine according to claim 1, characterized in that: A guide wear-resistant belt (9) is provided in the gap between the upper end cover (2) and the wear-resistant sleeve (7), and between the guide seal assembly (5) and the compressed air seal (1) of the tunneling machine.

5. The gas-liquid sealing system of a large full-face shaft boring machine according to claim 4, characterized in that: The guide wear-resistant belt (9) is made of polytetrafluoroethylene and bronze powder.

6. The gas-liquid sealing system of a large full-face shaft boring machine according to claim 1, characterized in that: A mud combination seal (3) is provided in the gap between the upper end cover (2) and the wear-resistant sleeve (7), and between the drainage seal assembly (5) and the compressed air seal (1) of the tunnel boring machine. The mud combination seal (3) includes a Z-shaped seal ring filled with polytetrafluoroethylene material and an O-shaped seal sleeve arranged on the outer periphery of the Z-shaped seal ring. The Z-shaped rubber ring is sleeved on the wear-resistant sleeve (7), and the outer edge of the O-shaped sealing ring is in contact with the upper end cover (2).

7. The gas-liquid sealing system of a large full-face shaft boring machine according to claim 1, characterized in that: The bottom of the guide groove (4) is inclined downward.

8. The gas-liquid sealing system of a large full-face shaft boring machine according to claim 1, characterized in that: The horizontal ring portion is fixed to the top of the groove bottom of the guide groove (4) via fastening bolts (501).

9. A large full-section shaft boring machine, characterized in that: A gas-liquid sealing system for a large full-face shaft boring machine as claimed in any one of claims 1 to 8.

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