Application method of split sealing knife barrel for shield machine

Abstract

The present invention discloses an application method of a split-type sealing knife barrel for a shield machine. After the split-type sealing knife barrel is installed, disassembled and fixed, the gate is replaced after the sealing effect is achieved. The present invention solves the problems of difficult operation, high risk, high cost and great impact when replacing the sealing gate under pressure in an environment with poor self-stability of the rock formation and high water pressure. The present invention has a higher safety guarantee for the normal pressure cutter disc under high water pressure, long distance and high frequency normal pressure cutter replacement, which helps to broaden the adaptability conditions of the normal pressure cutter disc and promote the use of the normal pressure cutter disc.

Description

Technical Field

[0001] The invention belongs to the field of special equipment for shield machines, and in particular relates to a device for replacing a knife barrel sealing gate of a normal-pressure knife changing device of a slurry-water balance shield machine under normal-pressure conditions. Background Art

[0002] In recent years, slurry-water air pressure balance shield machines have been widely used in tunnel transportation construction projects due to their safety and high efficiency.

[0003] The shield tunnel construction uses a slurry-balanced shield machine with a large cutter head excavation diameter, which includes sand layers, upper soft and lower hard sections, uneven soft and hard sections, and full-section bedrock. In the bedrock section, the cutter wear is serious, the cutter is frequently changed, the gate is opened and closed many times, and the gate seal fails and the risk of mechanical damage is high. In addition, during the cutter change process, it is easy for the gate gap to be mixed with debris when closing the gate, resulting in poor gate sealing or seal damage, and the cutter barrel cannot be replaced at normal pressure.

[0004] At present, the advantages and disadvantages of the design and use of normal pressure cutter discs are becoming increasingly clear. In the environment of poor rock self-stability and high water pressure, the replacement of sealing gates under pressure or the full-section sealing of the face is difficult to operate, has high risks, high costs, and great impacts. How to solve the risks brought about by the normal pressure cutter replacement process is imminent.

[0005] Based on the construction difficulties analyzed above, it is of great significance to design a device with simple structure, low cost and good effect for replacing the sealing gate at normal pressure when the sealing gate is about to fail. Summary of the invention

[0006] The present invention provides the following technical solution: an application method of a split-type sealed knife barrel for a shield machine, characterized in that: the split-type sealed knife barrel comprises a sealed knife barrel, a flange knife barrel, a knife barrel rear cover, a knife barrel connector, a knife barrel slot connector and a connector block, the sealed knife barrel and the flange knife barrel are fixed by the knife barrel connector, the flange knife barrel and the knife barrel rear cover are connected by a connecting bolt 1; the flange knife barrel and the sealing gate are connected by a connecting bolt 2, and the use steps are as follows:

[0007] a. Infer that the sealing gate needs to be replaced based on the sealing deformation and slag inclusion of the sealing gate, the number of gate replacements and replacement experience;

[0008] b. Before replacing the sealing gate, it is necessary to ensure that the sealing gate can be opened and closed at least once, so as to use the split sealing knife cylinder to replace the normal pressure knife cylinder;

[0009] c. After installing the split sealed knife cylinder, tighten the split sealed knife cylinder slot connector;

[0010] d. Separation of sealing knife cylinder and flange knife cylinder;

[0011] e. Replacement of sealing gate;

[0012] f. Pull out the split sealing knife cylinder;

[0013] g. Installation of normal pressure tool changer.

[0014] As a further solution of the present invention, the sealed knife cylinder and the flange knife cylinder can be separated and connected by disassembling and assembling the knife cylinder connecting piece, a sealing structure is present between the sealed knife cylinder and the flange knife cylinder, and a sealing structure is present between the rear cover and the knife cylinder.

[0015] As a further solution of the present invention, the slot connector is connected to the inside of the knife cylinder when the sealing knife cylinder is extended or retracted, and a sealing structure is present between the slot connector and the sealing knife cylinder.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The device is used to replace the sealing gate when the sealing gate is about to fail or has failed and cannot be completely sealed, resulting in slight water seepage. The beneficial effect is that it can eliminate the inability to seal or difficulty in sealing the sealing gate after complete failure through early judgment, greatly saving the replacement cost after full-section sealing.

[0018] 2. Before replacing the sealing gate, the normal pressure knife-changing cylinder must be removed, and the subsequent replacement steps are performed after the device of the present invention is installed. The beneficial effect is that the device of the present invention can be reused under the premise that the structural length is the same as that of the normal pressure knife-changing cylinder, which greatly saves the manufacturing cost.

[0019] 3. The slot connector is connected to the inside of the knife barrel when the sealed knife barrel is extended and retracted, and a sealing structure is present between it and the sealed knife barrel. After the sealed knife barrel completely enters the sealing seat and is in a connected state, it can be pushed out of the inside of the knife barrel and then pushed into the knife disc slot. Under the action of the slot connector, the sealed knife barrel is completely fixed. The beneficial effect is that the sealing structure of the slot connector can prevent slurry from entering the inside of the knife barrel when the knife barrel is extended and retracted. At the same time, the slot connector can withstand the pressure of the palm face in front of the knife disc after entering the slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Attached Figure 1 Assemble the final assembly and details for this device;

[0022] Figure 2 This is a second schematic diagram of the overall structure of the present invention (the first U-shaped mounting frame and the second U-shaped mounting frame are hidden);

[0023] Attached Figure 2 It is a schematic diagram of the connection hole of the sealing knife cylinder connection piece;

[0024] Attached Figure 3 This is a schematic diagram after removing the rear cover, the knife barrel connector, the card slot connector block, and screwing the card slot connector in;

[0025] Attached Figure 4 Schematic diagram of removing the rear cover and flange of the knife barrel;

[0026] Attached Figure 5 Schematic diagram of the pressure on the sealing knife cylinder after the sealing gate is removed.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1 Sealed knife cylinder, 2 Flange knife cylinder, 3 Knife cylinder back cover, 4 Knife cylinder slot connector, 5 Knife cylinder connector, 6 Slot connector pressure block, B1 Seal 2, B2 Seal 2, B3 Connecting bolt 1, B4 Connecting bolt 2, B5 Pressure gauge, B6 Ball valve, 7 Knife disc, 8 Sealed gate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, the split sealed knife cylinder device of the present invention is installed after the normal pressure knife cylinder is removed;

[0031] The sealing knife cylinder 1 and the flange knife cylinder 2 are connected by the knife cylinder connecting piece 5. After the device is assembled into the sealing gate 8, the flange knife cylinder 2 and the knife cylinder rear cover 3 are connected by connecting bolts 1 B3, and the flange knife cylinder 2 and the sealing gate 8 are connected by connecting bolts 2 B4;

[0032] There is a clamping block 6 between the knife barrel clamping connector 4 and the flange knife barrel 2, which can control the depth of the knife barrel clamping connector 4 screwed into the flange knife barrel 2 so as not to exceed its outer diameter;

[0033] After the split-type sealing knife cylinder is installed, open the ball valve B6, remove the water vapor in the sealing seat, and then close the ball valve B6. Observe the changes in the pressure gauge B5. Subsequent operations can be carried out when there is no pressure in the cavity.

[0034] like Figure 3 As shown, remove the knife barrel rear cover 3, clean the inside of the knife barrel, remove the knife barrel connector 5, remove the slot connector pressure block 6, and tighten the knife barrel slot connector 4 into the knife seat slot.

[0035] like Figure 4 As shown, reconnect the knife barrel rear cover 3 and connecting bolt 2 B4, remove connecting bolt 1 B3, slowly pull out the flange knife barrel 2 after connecting the oil cylinder, and observe the fixing condition of the sealing knife barrel 1 after removing the flange knife barrel 2. Subsequent operations can be carried out under the premise of no displacement or deformation.

[0036] like Figure 5 As shown, the sealing gate 8 can be removed at this time. After replacing the new sealing gate 8, the steps that have been performed are reversed to complete the replacement of the sealing gate 8 and the installation of the normal pressure knife barrel.

[0037] The sealing knife cylinder 1 and the flange knife cylinder 2 can be separated and connected by disassembling and assembling the knife cylinder connector 5. A sealing structure exists between the sealing knife cylinder 1 and the flange knife cylinder 2, and a sealing structure exists between the knife cylinder back cover 3 and the knife cylinder. The beneficial effect is that the slurry can be prevented from entering the interior of the knife cylinder when the knife cylinder is in a telescopic state.

[0038] The knife barrel connector 5 is assembled inside the knife barrel, which has the beneficial effect of saving assembly space without any changes to the original sealing gate 8 and knife barrel structure.

[0039] The knife barrel slot connector 4 is assembled inside the sealed knife barrel 1, and its assembly premise is that there is a slot in the sealing gate 8 connecting seat of the knife disc 7, the knife barrel rear cover 3 is opened, the sealed knife barrel 1 and the flange knife barrel 2 are in a connected state, and the flange knife barrel 2 and the sealing gate 8 are in a connected state. The beneficial effect is that the use of this invention device for a conventional slurry balance shield machine requires minimal changes to the original structure, and only requires the addition of a knife disc connecting sealing seat flange slot.

[0040] The knife barrel slot connector 4 is connected to the inside of the knife barrel when the sealed knife barrel 1 is extended and retracted, and there is a sealing structure between it and the sealed knife barrel 1. After the sealed knife barrel 1 completely enters the sealing seat and is in a connected state, it can be pushed out of the inside of the knife barrel and then pushed into the knife disc slot. Under the action of the knife barrel slot connector 4, the sealed knife barrel 1 is completely fixed. The beneficial effect is that the sealing structure of the knife barrel slot connector 4 can prevent slurry from entering the inside of the knife barrel when the knife barrel is extended and retracted. At the same time, the knife barrel slot connector 4 can withstand the pressure of the face in front of the knife disc after entering the slot.

[0041] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An application method of a split-type sealing knife barrel for a shield machine, characterized in that: The split sealing knife cylinder includes a sealing knife cylinder, a flange knife cylinder, a knife cylinder back cover, a knife cylinder connector, a knife cylinder slot connector and a connector block. The sealing knife cylinder and the flange knife cylinder are fixed by the knife cylinder connector. The flange knife cylinder and the knife cylinder back cover are connected by a connecting bolt 1. There is a slot connector block between the knife cylinder slot connector and the flange knife cylinder, which can control the depth of the knife cylinder slot connector screwed into the flange knife cylinder so that it does not exceed its outer diameter. The flange knife cylinder and the sealing gate are connected by a connecting bolt 2. The use steps are as follows: a. Infer that the sealing gate needs to be replaced based on the sealing deformation and slag inclusion of the sealing gate, the number of replacements of the sealing gate and the replacement experience; b. Before replacing the sealing gate, it is necessary to ensure that the sealing gate can be opened and closed at least once, so as to use the split sealing knife cylinder to replace the normal pressure knife cylinder; c. After installing the split sealed knife cylinder, tighten the split sealed knife cylinder slot connector; d. Separation of sealing knife cylinder and flange knife cylinder; e. Replacement of sealing gate; f. Pull out the split sealing knife cylinder; g. Installation of normal pressure tool changer; The sealed knife cylinder and the flange knife cylinder can be separated and connected by disassembling and assembling the knife cylinder connecting piece. There is a sealing structure between the sealed knife cylinder and the flange knife cylinder, and there is a sealing structure between the back cover and the knife cylinder. The slot connecting piece is connected to the inside of the knife cylinder when the sealed knife cylinder is extended or retracted, and there is a sealing structure between it and the sealed knife cylinder.

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