A Shield Machine's Method of Plugging with a Cutter Head Expansion and Blocking Body for Replacing a Sealing Seat under Normal Pressure

Abstract

The present invention discloses a plugging method for a cutter head expansion and occlusion body for replacing a seal seat under normal pressure of a shield machine. Install a sealing cylinder body. A closed second foaming cavity part is formed between the sealing cylinder body and the cutter head seat. For the first foaming and curing, a polyurethane expansion material is sprayed for the first time and cured in the second foaming cavity part. For the second foaming and curing, a second polyurethane expansion material is cured in the first foaming cavity part and the second foaming cavity part. After the second foaming and curing, the seal seat is replaced. The present invention adopts a plugging method of foaming and curing with a second polyurethane expansion material. For both the first foaming and curing and the second foaming and curing, the polyurethane expansion material is input into the sealing cylinder body through a hose. The operator does not need to enter the cutter head seat bin for construction, and the construction safety is guaranteed, thereby reducing the safety construction risk and helping to improve the seal seat replacement efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of cutter head plugging and replacing sealing seats, and in particular to a method for plugging with a cutter head expansion closure body for replacing a sealing seat of a shield machine at normal pressure. Background Art

[0002] The cutter is an indispensable part of the shield machine during excavation. As the shield machine continues to excavate, the cutter is also constantly wearing. In order to ensure the efficient excavation and construction quality of the shield machine, the cutter needs to be replaced in time. The seal gate for cutter replacement is also used frequently. During the frequent opening and closing process, it is easy to cause the seal slag to appear in the seal seat where the seal gate is installed, resulting in seal damage, extrusion, and even leakage and water gushing. Due to the high pressure of the mud and water bin, in order to ensure the replacement of the seal seat in a waterless environment under normal pressure, the mud and water bin and the seal seat need to be blocked. After the seal seat is replaced, the seal gate can be opened and closed normally, so that the worn cutter can be replaced under normal pressure.

[0003] In the prior art, the installation of the cutter head, the cutter head seat, the sealing seat and the gate cylinder is as follows: Figure 5 As shown, the shield machine is to install the cutter head 15 on the cutter head seat 16, and the cutter head seat 16 and the sealing seat 17 are detachably connected by a plurality of bolts 20, and a gate cylinder 18 is provided on the side of the sealing seat 17 away from the cutter head seat 16. When the sealing seat 17 is replaced, it is necessary to seal in the inner cavity of the cutter head seat 16 to prevent the pressurized liquid in the mud and water bin from entering the sealing seat 17, causing construction difficulties and safety construction risks; and for the sealing of the cutter head seat 16, the traditional method is that the hydraulic cylinder drives the rigid cylinder to enter the cutter head seat 16, and the rigid cylinder Fastening bolts are provided in the circumferential direction of the body 16, and the operator enters the sealing seat chamber and unscrews the fastening bolts so that the fastening bolts lock the circumferential inner wall of the cutter disc seat 16, thereby realizing a fastening connection between the cutter disc seat 16 and the rigid cylinder to block the entry of pressurized liquid in the mud and water bin; however, during the construction operation process, it is inconvenient to position and lock the fastening bolts and the circumferential inner wall of the cutter disc seat 16, and the operator enters the chamber for construction. When the rigid cylinder is not fastened and sealed in the installation state, the construction safety cannot be guaranteed, which has a greater construction risk and affects the efficiency of replacing the sealing seat. Summary of the invention

[0004] The purpose of the present invention is to provide a method for sealing a cutter head expansion plug for replacing a sealing seat of a shield machine at normal pressure, so as to solve the problem of construction risk caused by the installation of a cutter head seat by locking a rigid cylinder with a plurality of bolts in the prior art.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for plugging a cutter head expansion and occlusion body for replacing a seal seat under normal pressure of a shield machine. The cutter head of the shield machine is installed on a cutter head seat. The cutter head seat is detachably connected to the seal seat through a plurality of bolts, and a gate cylinder is provided on the side of the seal seat away from the cutter head seat. The seal seat is used for installing a seal gate, and the method includes the following steps:

[0007] Step 1, install a seal cylinder, push the seal cylinder into the inner cavity of the cutter head seat, and a closed foaming cavity part two is formed between the seal cylinder and the cutter head seat;

[0008] Step 2, primary foaming and curing. Input polyurethane expansion material into the central pipe through a hose one. The polyurethane expansion material is dispersed into a plurality of injection branch pipes until the polyurethane expansion material is sprayed onto the groove part formed on the circumferential inner wall of the cutter head seat. The primary injection of the polyurethane expansion material is cured in the foaming cavity part two;

[0009] Step 3, secondary foaming and curing. After 3 minutes of injecting the polyurethane expansion material into the foaming cavity part two for the first time, input the polyurethane expansion material into the foaming cavity part one through a hose two. The polyurethane expansion material overflows into the foaming cavity part two through a plurality of spray holes formed on the outer wall of the foaming cavity part one and is cured;

[0010] Step 4, after the secondary foaming and curing, when the seal cylinder is pushed without loosening, remove the plurality of bolts connecting the cutter head seat and the seal seat, and replace the seal seat;

[0011] Step 5, after the seal seat is replaced, input heating gas or liquid into the heating cavity part through a hose four, and the hose five circulates and outputs the heat-exchanged gas or liquid, softens the cured polyurethane expansion material in the foaming cavity part two into a fluid state, and extracts it through a hose three, releases the locking connection between the seal cylinder and the cutter head seat, and withdraws the seal cylinder from the gate cylinder.

[0012] As a further scheme of the present invention: the seal cylinder in Step 1 is sequentially provided with a hollow cavity part, a heating cavity part, and a foaming cavity part one from the inside to the outside.

[0013] As a further scheme of the present invention: the central pipe in Step 2 is used to be installed in the hollow cavity part, and the pipe end of the central pipe extending out of the hollow cavity part is connected to the hose.

[0014] As a further scheme of the present invention: a plurality of the injection branch pipes in Step 2 are arranged along the circumferential direction of the central pipe, and the tail ends of the injection branch pipes sequentially penetrate through the heating cavity part and the foaming cavity part one and extend into the foaming cavity part two.

[0015] As a further scheme of the present invention: the hose two in Step 3 and the hose three in Step 5 are used to be inserted and connected to the foaming cavity part one.

[0016] As a further solution of the present invention: in step five, the fourth hose and the fifth hose are used for insertion connection to the heating cavity part.

[0017] As a further solution of the present invention: when installing the sealing cylinder body in step one, sealing rings are respectively arranged on both sides of the second foaming cavity part, and the sealing rings are provided for sealing connection to the cutter head seat.

[0018] As a further solution of the present invention: when installing the sealing cylinder body in step one, an integrally structured first extension ring part and a second extension ring part are respectively provided at both ends of the sealing cylinder body. The first extension ring part is used to abut against the inner cavity wall of the cutter head, and the second extension ring part is used to abut against the inner cavity wall of the sealing seat.

[0019] As a further solution of the present invention: when performing secondary foaming and curing in step three, a ring strip convex part for strengthening connection is provided on the circumferential outer wall of the first foaming cavity part.

[0020] Advantages of the present invention:

[0021] (1) In the present invention, the cutter head seat is blocked by primary foaming and curing. The polyurethane expansion material is sprayed into the groove part opened on the cutter head seat through several injection branch pipes for the first time, so that the polyurethane expansion material is pre-foamed and formed in the groove part. The sprayed polyurethane expansion material flows towards the second foaming cavity parts on both sides of the groove part, realizing the blocking of the cutter head seat by the foaming and forming of the polyurethane expansion material, while strengthening the connection strength between the sealing cylinder body and the polyurethane expansion material, and ensuring the first closed combination of the polyurethane expansion material with the cutter head seat and the sealing cylinder body;

[0022] (2) In the present invention, the cutter head seat is blocked by secondary foaming and curing. The polyurethane expansion material of the secondary foaming fills the first foaming cavity part and the second foaming cavity part, so that the second foaming cavity part enclosed between the sealing cylinder body and the cutter head seat is filled completely, and at the same time, it combines and cures with the polyurethane expansion material that is not completely foamed and cured in the first time. The foaming filling is completed, and the foaming material fills the first foaming cavity part and the second foaming cavity part, having a strong binding force on the cutter head seat and the sealing cylinder body, further strengthening the blocking strength of the sealing cylinder body and improving the safety performance;

[0023] (3) The present invention adopts the method of blocking by secondary foaming and curing of the polyurethane expansion material. Both the primary foaming and curing and the secondary foaming and curing input the polyurethane expansion material into the sealing cylinder body through hoses. The operator does not need to enter the cutter head seat bin for construction, and the construction safety is guaranteed, thereby reducing the safety construction risk and helping to improve the replacement efficiency of the sealing seat. Description of the drawings

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the installation of the sealed cylinder in Step 1 of the specific implementation mode of the present invention;

[0026] Figure 2 It is a schematic cross-sectional view of the sealed cylinder in Step 1 of the specific implementation mode of the present invention;

[0027] Figure 3 It is Figure 2 The enlarged view in the direction of A in;

[0028] Figure 4 It is a schematic structural diagram of the sealed cylinder in Step 1 of the specific implementation mode of the present invention;

[0029] Figure 5 It is a schematic diagram of the installation of the cutter head, cutter head seat, seal seat and gate cylinder in the prior art.

[0030] In the figure: 1. Sealed cylinder; 2. Hollow cavity part; 3. Heating cavity part; 4. Foaming cavity part one; 5. Foaming cavity part two; 6. Central tube; 7. Hose one; 8. Injection branch pipe; 9. Groove part; 10. Spray hole; 11. Hose two; 12. Hose three; 13. Hose four; 14. Hose five; 15. Cutter head; 16. Cutter head seat; 17. Seal seat; 18. Gate cylinder; 19. Sealing gate; 20. Bolt; 21. Sealing ring; 22. Extension ring part one; 23. Extension ring part two; 24. Ring strip convex part. Specific implementation mode

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; in the description of the present invention, the meanings of "a plurality" and "several" are at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0033] Please refer to Figures 1-5As shown in the figure, the present invention is a method for plugging a cutter head expansion and occlusion body for replacing a sealing seat under normal pressure of a shield machine. The shield machine includes a cutter head 15 installed on a cutter head seat 16. The cutter head seat 16 is detachably connected to a sealing seat 17 through a plurality of bolts 20, and a gate cylinder 18 is provided on the side of the sealing seat 17 away from the cutter head seat 16. The sealing seat 17 is used for installing a sealing gate 19, and the method includes the following steps:

[0034] Step 1: Install the sealing cylinder 1. Push the sealing cylinder 1 into the inner cavity of the cutter head seat 16. A closed foaming cavity part two 5 is formed between the sealing cylinder 1 and the cutter head seat 16.

[0035] In this step, the sealing cylinder 1 is sequentially provided with a hollow cavity part 2, a heating cavity part 3, and a foaming cavity part one 4 from the inside to the outside. The central pipe 6 is used to be installed in the hollow cavity part 2, and the pipe end of the central pipe 6 extending outwards is connected to a hose 7; a plurality of injection branch pipes 8 are arranged along the circumferential direction of the central pipe 6, and the tail ends of the injection branch pipes 8 sequentially penetrate through the heating cavity part 3 and the foaming cavity part one 4 and extend into the foaming cavity part two 5; the hose two 11 and the hose three 12 in step 5 are used to be inserted and connected to the foaming cavity part one 4; the hose four 13 and the hose five 14 are used to be inserted and connected to the heating cavity part 3; it is convenient to install and use the sealing cylinder 1. Pipelines are respectively arranged in several partition cavities of the sealing cylinder 1 in sequence. When pushing the sealing cylinder 1, the flange at the pipe orifice end of the central pipe 6 is docked with a hydraulic cylinder, and the sealing cylinder 1 can be easily pushed along the gate cylinder 18 and the sealing seat 17 into the cutter head seat by the hydraulic cylinder.

[0036] Furthermore, in this step of installing the sealing cylinder 1, sealing rings 21 are respectively arranged on both sides of the foaming cavity part two 5. The sealing rings 21 are used for sealing connection with the cutter head seat 16, and the arranged sealing rings 21 are used for the function of sealing the subsequent secondary polyurethane expansion material foamed and formed in the foaming cavity part two 5. At the same time, it can prevent the pressurized liquid in the mud sump from entering the foaming cavity part two 5, thereby avoiding affecting the secondary foaming and plugging connection function.

[0037] Furthermore, in this step of installing the sealing cylinder 1, the two ends of the sealing cylinder 1 are respectively provided with an integral structure of an extended ring part one 22 and an extended ring part two 23. The extended ring part one 22 is used to abut against the inner cavity wall of the cutter head 15, and the extended ring part two 23 is used to abut against the inner cavity wall of the sealing seat 17. The arranged extended ring part one 22 and extended ring part two 23 are used for the function of strengthening the plugging strength of the sealing cylinder 1.

[0038] Step 2: Primary foaming and curing. Input polyurethane expansion material into the central pipe 6 through the hose one 7. The polyurethane expansion material is dispersed into a plurality of injection branch pipes 8 until the polyurethane expansion material is sprayed onto the groove part 9 opened on the circumferential inner wall of the cutter head seat 16. The primary sprayed polyurethane expansion material is cured in the foaming cavity part two 5.

[0039] In this step, a polyurethane expansion material is sprayed once into the groove portion 9 formed in the cutter head seat 16 through a number of spray branch pipes 8, so that the polyurethane expansion material is pre-foamed and formed in the groove portion 9. The sprayed polyurethane expansion material flows to the second foaming cavity portion 5 on both sides of the groove portion 9. While realizing the foaming and forming of the polyurethane expansion material to seal the cutter head seat 16, the connection strength between the sealing cylinder 1 and the polyurethane expansion material is enhanced, ensuring that the polyurethane expansion material is first hermetically combined with the cutter head seat 16 and the sealing cylinder 1 together.

[0040] Step 3: Secondary foaming and curing. Three minutes after spraying the polyurethane expansion material into the second foaming cavity portion 5 for the first time, the polyurethane expansion material is input into the first foaming cavity portion 4 through the second hose 11, and the polyurethane expansion material overflows into the second foaming cavity portion 5 through a number of spray holes 10 formed on the outer wall of the first foaming cavity portion 4 and cures.

[0041] In this step, the secondary foaming process is carried out three minutes after spraying the polyurethane expansion material for the first foaming. The polyurethane expansion material for the first foaming is not completely foamed and cured. The polyurethane expansion material for the secondary foaming fills the first foaming cavity portion 4 and the second foaming cavity portion 5, so that the enclosed second foaming cavity portion 5 between the sealing cylinder 1 and the cutter head seat 16 is filled completely. At the same time, it combines and cures with the incompletely foamed and cured polyurethane expansion material for the first time. The foaming filling is completed, and the foaming material fills the first foaming cavity portion 4 and the second foaming cavity portion 5, having a strong binding force on the cutter head seat 16 and the sealing cylinder 1, further enhancing the sealing strength of the sealing cylinder 1 and improving the safety performance. In addition, both the first foaming and curing and the secondary foaming and curing are to input the polyurethane expansion material into the sealing cylinder 1 through a hose. The operator does not need to enter the cutter head seat 16 bin for construction, and the construction safety is guaranteed, thus reducing the safety construction risk and helping to improve the replacement efficiency of the sealing seat 17.

[0042] Further, in this step during the secondary foaming and curing, a ring-shaped convex portion 24 for strengthening the connection is provided on the circumferential outer wall of the first foaming cavity portion 4. The provided ring-shaped convex portion 24 increases the contact area between the polyurethane expansion material and the sealing cylinder 1, so as to enhance the foaming and curing strength of the sealing cylinder 1 and the polyurethane expansion material, and further strengthen the sealing connection strength.

[0043] Step 4: After the secondary foaming and curing, when the sealing cylinder 1 is pushed without looseness, a number of bolts 20 connecting the cutter head seat 16 and the sealing seat 17 are disassembled, and the sealing seat 17 is replaced.

[0044] In this step, the sealing cylinder 1 is pushed by a hydraulic cylinder. When there is no displacement of the sealing cylinder 1, the sealing inspection is completed to prevent the pressurized liquid in the mud chamber from entering, and the construction is safe.

[0045] Step 5: After the replacement of the seal seat 17 is completed, heating gas or liquid is input into the heating chamber 3 through the fourth hose 13, and the heat-exchanged gas or liquid is cyclically output through the fifth hose 14 to soften the cured polyurethane expansion material in the second foaming chamber 5 into a fluid state, and then it is evacuated through the third hose 12. The locking connection between the sealing cylinder 1 and the cutter head seat 16 is released, and the sealing cylinder 1 is withdrawn from the gate cylinder 18, which facilitates the cyclic delivery of heating gas or liquid to the heating chamber 3 through the fourth hose 13 and the fifth hose 14, so that the foamed and cured polyurethane expansion material is softened into a fluid state, which is convenient for evacuating and discharging the sealing cylinder 1, thereby releasing the locking connection between the sealing cylinder 1 and the cutter head seat 16, enabling the replaced seal seat 17 to perform normal opening and closing actions, discharging the pressurized liquid in the mud chamber, and thus realizing the construction of tool changing under atmospheric pressure.

[0046] The above has described an embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A plugging method for a cutter head expansion and occlusion body for replacing a sealing seat under normal pressure of a shield machine. The shield machine includes a cutter head (15) installed on a cutter head seat (16). The cutter head seat (16) is detachably connected to a sealing seat (17) through a plurality of bolts (20), and a gate cylinder body (18) is provided on a side of the sealing seat (17) away from the cutter head seat (16). The sealing seat (17) is used for installing a sealing gate (19), and is characterized in that, It includes the following steps: Step 1: Install the sealing cylinder body (1), push the sealing cylinder body (1) into the inner cavity of the cutter head seat (16). A closed foaming cavity part two (5) is formed between the sealing cylinder body (1) and the cutter head seat (16). The sealing cylinder body (1) is successively provided with a hollow cavity part (2), a heating cavity part (3), and a foaming cavity part one (4) from the inside to the outside. When installing the sealing cylinder body (1), extension ring part one (22) and extension ring part two (23) with an integral structure are respectively arranged at both ends of the sealing cylinder body (1). The extension ring part one (22) is used to abut against the inner cavity wall of the cutter head (15), and the extension ring part two (23) is used to abut against the inner cavity wall of the sealing seat (17); Step 2: Primary foaming and curing. Input polyurethane expanding material into the central pipe (6) through the first hose (7). The polyurethane expanding material is dispersed into a number of injection branch pipes (8) until the polyurethane expanding material is sprayed onto the groove part (9) formed on the circumferential inner wall of the cutter head seat (16). The first injection of polyurethane expanding material cures in the foaming cavity part two (5). The number of injection branch pipes (8) is arranged along the circumferential direction of the central pipe (6), and the tail ends of the injection branch pipes (8) successively penetrate through the heating cavity part (3) and the foaming cavity part one (4) and extend into the foaming cavity part two (5); Step 3: Secondary foaming and curing. 3 minutes after the first injection of polyurethane expanding material into the foaming cavity part two (5), input polyurethane expanding material into the foaming cavity part one (4) through the second hose (11). The polyurethane expanding material overflows into the foaming cavity part two (5) through a number of spray holes (10) formed on the outer wall of the foaming cavity part one (4) and cures; Step 4: After the secondary foaming and curing, when the sealing cylinder body (1) is pushed without loosening, remove a number of bolts (20) connecting the cutter head seat (16) and the sealing seat (17), and replace the sealing seat (17); Step 5: After the replacement of the sealing seat (17) is completed, input heating gas or liquid into the heating cavity part (3) through the fourth hose (13), and the fifth hose (14) circulates and outputs the heat-exchanged gas or liquid to soften the cured polyurethane expanding material in the foaming cavity part two (5) into a fluid state, and then extract it through the third hose (12). Release the locking connection between the sealing cylinder body (1) and the cutter head seat (16), and pull out the sealing cylinder body (1) from the gate cylinder body (18).

2. A method for plugging a cutter head expansion and occlusion body for replacing a sealing seat under normal pressure of a shield machine, characterized in that, One end of the central pipe (6) described in Step 2 is installed in the hollow cavity part (2), and the other end extends out of the hollow cavity part (2) and is connected to the first hose (7).

3. A method for plugging a cutter head expansion and occlusion body for replacing a sealing seat under normal pressure of a shield machine, characterized in that, The second hose (11) described in Step 3 and the third hose (12) described in Step 5 are used for insertion and connection to the foaming cavity part one (4).

4. A method for plugging a cutter head expansion and occlusion body for replacing a sealing seat under normal pressure of a shield machine, characterized in that, The fourth hose (13) and the fifth hose (14) described in Step 5 are used for insertion and connection to the heating cavity part (3).

5. A method for plugging a cutter head expansion and occlusion body for replacing a sealing seat under normal pressure of a shield machine, characterized in that, When installing the sealing cylinder body (1) in Step 1, sealing rings (21) are respectively arranged on both sides of the foaming cavity part two (5). The sealing rings (21) are provided for sealing connection with the cutter head seat (16).

6. A method for plugging a cutter head expansion occlusion body for replacing a seal seat under normal pressure of a shield machine, characterized in that, During the secondary foaming and curing in Step 3, a ring-shaped convex part (24) for strengthening the connection is provided on the circumferential outer wall of the foaming cavity part 1 (4).

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