Pressure cutter device inside the main arm of the shield machine normal pressure cutter head and its disassembly and assembly method

Abstract

The present invention relates to a device and method for replacing cutters under pressure inside a shield machine's normal-pressure cutterhead. By adding pressurized cutters, the tool cutting trajectory on the limited area of ​​a normal-pressure cutterhead main arm is increased, thereby improving the cutting capacity of the cutterhead cutter. The device comprises a normal-pressure cutterhead main arm, a front panel of which is provided with a plurality of normal-pressure cutters, a cavity is built in the normal-pressure cutterhead main arm, and the cavity is connected to the center cone at the rear end of the cutterhead; the front panel is also detachably connected to the plurality of pressurized cutters via a connecting assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of urban underground engineering construction, and is aimed at a shield machine equipped with a normal-pressure replaceable cutter disc, and specifically relates to a pressure-carrying cutter device inside a main arm of the normal-pressure cutter disc of the shield machine and a disassembly and assembly method. Background Art

[0002] With the rapid development of domestic transportation infrastructure construction, it is increasingly used in underground engineering construction such as urban subways and river-crossing tunnels. In river-crossing projects, due to the large tunnel burial depth, strong ground permeability and high water pressure, a normal pressure replaceable cutter disc slurry shield machine with the characteristics of safety, speed and efficiency is often selected. For example, the patent with announcement number CN 205243509 U discloses the cutter disc and shield machine of the shield machine. The cutter disc includes a cutter disc frame having a front working surface; a main spoke arm; a box-type spoke arm, a normal-pressure chamber having an entrance and exit defined in the box-type spoke arm; a normal-pressure replaceable tool assembly, the normal-pressure replaceable tool assembly including a mounting seat, a detachable tool and a switching piece, a mounting cavity for installing the tool is provided in the mounting seat, the front and rear relative positions of the tool and the switching piece are switchably arranged on the mounting seat, a normal-pressure replaceable tool assembly is provided on the front surface of each box-type spoke arm, when the cutter disc is working, the switching piece is located at the rear side of the tool to separate the tool and the normal-pressure chamber, when the tool is replaced, the switching piece is located at the front side of the tool so that the tool is connected to the normal-pressure chamber and the normal-pressure chamber is separated from the environment where the front working surface of the cutter disc is located.

[0003] However, the interior of the normal-pressure replaceable tool disc is hollow, with a large volume and a small opening ratio. In addition, since the normal-pressure replaceable tool changing tooling occupies a large space, the number of normal-pressure tools is small, and the tool arrangement trajectories are small, there is an excessively large distance between the two normal-pressure tools on the front panel of the disc. Summary of the invention

[0004] The present invention relates to a device and method for replacing cutters under pressure inside a shield machine's normal pressure cutter disc. By adding a pressurized cutter, the cutting track of the cutter on the limited area of ​​the main arm of the normal pressure cutter disc is increased, thereby improving the cutting capacity of the cutter disc cutter.

[0005] The present invention is achieved through the following technical solutions:

[0006] A pressure cutter device inside a shield machine normal pressure cutter disc main arm, comprising a normal pressure cutter disc main arm, a front panel of the normal pressure cutter disc main arm is provided with a plurality of normal pressure cutters, a cavity is built in the normal pressure cutter disc main arm, and the cavity is connected to the rear end center cone of the cutter disc;

[0007] The front panel is also detachably connected to a plurality of pressure-bearing cutters via a connecting assembly.

[0008] Furthermore, the front panel is provided with an opening, the top side of the opening is provided with a concave groove plate with an opening facing downward, and the bottom side is provided with a flat plate, the connecting assembly includes a connecting block and an L-shaped connecting plate, the top surface of the connecting block is provided with a protruding block that can be engaged with the concave groove plate, and the bottom surface is provided with an inclined surface, the L-shaped connecting plate includes a wedge block and a vertical plate, the gap between the bottom side of the connecting block and the flat plate can be engaged with the wedge block, and the vertical plate is connected to the back of the connecting block by fixing bolts; the front of the connecting block is connected to the pressure tool.

[0009] Furthermore, a structural box capable of surrounding the connecting assembly is provided on the rear side of the front panel, and a sealing plate is connected to the rear end surface of the structural box.

[0010] Furthermore, the opening is a rectangular hole, the concave groove plate is welded on a fixed side of the opening, and the flat plate is welded on a bottom side of the opening.

[0011] A method for disassembling and assembling a pressure cutter device inside a main arm of a shield machine normal pressure cutter head, comprising the following steps:

[0012] S1. An opening is machined on the front panel of the main arm of the normal pressure cutter disc, and a rectangular structural box is welded behind the opening, and the structural box is used to accommodate the connection components of the pressure cutter;

[0013] S2. A concave groove plate is welded at the connection between the opening and the top side of the structural box, and a flat plate is welded at the connection between the opening and the bottom side of the structural box;

[0014] S3. Place the connection block with the pressure cutter welded on the front between the flat plate and the concave groove plate, so that the protrusion on the top surface of the connection block is embedded in the concave groove plate, insert the wedge block of the L-shaped connection plate into the gap between the bottom side of the connection block and the flat plate to achieve longitudinal fixation of the connection block, and then use fixing bolts to fix the vertical plate of the L-shaped connection plate to the back of the connection block to achieve transverse fixation of the connection block;

[0015] S4. Connect the rear end surface of the structure box with a sealing plate to finally realize the fixed installation of the pressure cutter;

[0016] S5. When the pressure cutter is worn, it is necessary to replace the pressure cutter. The specific steps are as follows:

[0017] S51. The pressure workers need to wait until the pressure in the excavation chamber, air cushion chamber and cutter disc is balanced and the liquid level drops below the center line of the cutter disc before entering the inner cavity of the main arm of the normal pressure cutter disc through the double-layer chamber door of the center cone.

[0018] S52, first remove the sealing plate to expose the connection assembly of the pressure cutter, loosen the fixing bolts to remove the L-shaped connector, separate the protrusion of the connecting block from the concave groove plate, and pull the connecting block connected to the pressure cutter out of the structure box for replacement;

[0019] S53, repeating steps S3 and S4 to complete the installation of a new pressure cutter and restore the excavation state in which the excavation chamber is full of mud.

[0020] Furthermore, in step S1, the shape of the opening formed on the front panel of the atmospheric pressure cutter head main arm should be a rectangular structure, which has the same size as the inner surface of the welded structural steel box.

[0021] Furthermore, in step S2, the concave groove plate and the flat plate should be welded flush with the outer surface of the cutter disc, and a wear-resistant protective block should be welded on the outer periphery.

[0022] Furthermore, in step S4, a sealing strip should be provided on the contact surface between the sealing plate and the structural box.

[0023] Furthermore, in step S51, after the liquid level in the excavation chamber is lowered, the pressure of the cavity gas of the atmospheric pressure cutter head main arm should be equal to the pressure of the excavation chamber and the air cushion chamber.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Multiple pressure cutters are detachably connected to the front panel of the main arm of the normal pressure cutter disc, so that in addition to the normal pressure cutters, there are also pressure cutters on the front panel of the main arm of the normal pressure cutter disc, which increases the cutting track of the cutters within the limited area of ​​the main arm of the cutter disc and improves the cutting capacity of the cutter disc cutters. This is beneficial to the cutting of the face and the flow of slag;

[0026] 2. The method for disassembling and assembling the pressurized cutter device inside the main arm of the shield machine normal pressure cutter disc of the present invention can efficiently and quickly disassemble and replace the pressurized cutter. At the same time, compared with entering the excavation chamber and replacing the pressurized cutter on the cutter disc panel, the safety of replacing the pressurized cutter inside the main arm of the normal pressure cutter disc is greatly improved, thereby avoiding serious harm to the pressurized workers caused by accidents such as landslides on the face.

[0027] 3. A concave groove plate with the opening facing downward is provided on the top side of the opening, and a flat plate is provided on the bottom side. The connecting assembly includes a connecting block and an L-shaped connecting plate. The top surface of the connecting block is provided with a protruding block that can be engaged with the concave groove plate, and the bottom surface is provided with an inclined surface. Through this structure, the pressure tool can be firmly installed to ensure the stability of the pressure tool and facilitate disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a plane diagram of the normal pressure cutterhead;

[0029] Figure 2 This is the side view of the shield machine's normal pressure cutterhead main arm;

[0030] Figure 3 This is a schematic diagram of the pressure cutter device of the present invention;

[0031] In the figure: 1. front panel, 2. main arm of normal pressure cutter disc, 3. double-layer door, 4. normal pressure cutter, 5. structural box, 6. concave groove plate, 7. flat plate, 8. connecting block, 9. L-shaped connecting plate, 10. fixing bolts, 11. sealing plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the description of the invention, it should be understood that the terms "front", "rear", "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the invention. The invention is further described below in conjunction with the drawings and embodiments.

[0034] like Figure 1 As shown, the normal pressure cutter disc is composed of a plurality of normal pressure cutter disc main arms 2, and a plurality of normal pressure cutters are arranged on the front panel 1 of the normal pressure cutter disc main arm 2. Since the normal pressure cutters occupy a large space, resulting in a small number of cutter tracks, the present embodiment discloses a pressure cutter device inside the normal pressure cutter disc main arm of a shield machine, such as Figure 2-3 As shown, it includes a normal-pressure cutter disc main arm 2, a connecting component and a normal-pressure tool 4. The normal-pressure cutter disc main arm 2 has a cavity built in it, and the cavity is connected to the center cone at the rear end of the cutter disc. A plurality of pressure tools 4 can be detachably connected to the front panel 1 of the normal-pressure cutter disc main arm through the connecting component, so that the normal-pressure cutter disc main arm 2 can also have pressure tools on the premise of having normal-pressure tools.

[0035] In order to facilitate the installation of the pressure cutter, a rectangular opening is provided on the front panel 1, and a concave groove plate 6 is welded on the top side of the opening, the opening of the concave groove plate 6 faces downward, and a flat plate 7 is welded on the bottom side of the opening. The connection assembly includes a connection block 8 and an L-shaped connection plate 9. The top surface of the connection block 8 is processed with a protruding block, which can be engaged with the concave groove plate 6, and an inclined surface is processed on the bottom surface of the connection block 8. The L-shaped connection plate 9 includes a wedge block and a vertical plate. The gap between the bottom side of the connection block 8 and the flat plate 7 can be engaged with the wedge block. When the wedge block of the L-shaped connection plate 9 is inserted into the gap, the vertical plate can fit the back of the connection block 8. The vertical plate is connected to the back of the connection block 8 by fixing bolts 10, and the pressure cutter is welded in front of the connection block 8.

[0036] A structural box 5 capable of surrounding the connection assembly is welded to the rear side of the front panel 1, and a sealing plate 11 is connected to the rear end face of the structural box 5. A sealing strip should be provided on the contact surface between the sealing plate 11 and the structural box 5 to prevent the steel sealing plate from leaking when the normal pressure state is inside the normal excavation cutterhead. In this embodiment, the concave groove plate 6, the flat plate 7, the L-shaped connector and the connecting block 8 are all made of steel.

[0037] This embodiment also provides a method for disassembling and assembling a pressure cutter device inside a main arm of a shield machine normal pressure cutter head, comprising the following steps:

[0038] S1. A hole is machined on the front panel 1 of the main arm of the normal pressure cutter disc, and a rectangular structural box 5 is welded behind the hole. The structural box 5 is used to accommodate the connection components of the pressure cutter. In this step, the shape of the hole should be a rectangular structure with the same size as the inner surface of the welded structural steel box.

[0039] S2. A concave groove plate 6 is welded at the top connection of the opening and the structural box 5, and a flat plate 7 is welded at the bottom connection of the opening and the structural box 5. In this step, the concave groove plate 6 and the flat plate 7 should be flush with the outer surface of the cutter head when welded, and a wear-resistant protective block is welded on the periphery;

[0040] S3. Place the connection block 8 with a pressure cutter welded on the front end surface between the flat plate 7 and the concave groove plate 6, so that the protrusion on the top surface of the connection block 8 is embedded in the concave groove plate 6, insert the wedge block of the L-shaped connection plate 9 into the gap between the bottom side of the connection block 8 and the flat plate 7 to achieve the longitudinal fixation of the connection block 8, and then use the fixing bolts 10 to fix the vertical plate of the L-shaped connection plate 9 to the back of the connection block 8 to achieve the lateral fixation of the connection block 8;

[0041] S4. Connect the rear end surface of the structural box 5 with a sealing plate. A sealing strip should be provided on the contact surface between the sealing plate and the structural box 5 to prevent leakage of slurry, so as to finally realize the fixed installation of the pressure cutter;

[0042] S5. When the pressure cutter is worn, it is necessary to replace the pressure cutter. The specific steps are as follows:

[0043] S51. The pressure workers need to wait until the pressure in the excavation chamber, air cushion chamber and cutter disc is balanced and the liquid level drops below the center line of the cutter disc. The pressure of the cavity gas in the main arm of the normal pressure cutter disc should be equal to the pressure in the excavation chamber and air cushion chamber. The pressure workers enter the inner cavity of the main arm of the normal pressure cutter disc through the double-layer chamber door 3 of the center cone.

[0044] S52, first remove the sealing plate to expose the connection assembly of the pressure cutter, loosen the fixing bolts 10 to remove the L-shaped connector, separate the protrusion of the connecting block 8 from the concave groove plate 6, and pull the connecting block 8 connected to the pressure cutter out of the structure box 5 for replacement;

[0045] S53, repeating steps S3 and S4 to complete the installation of a new pressure cutter and restore the excavation state in which the excavation chamber is full of mud.

[0046] By detachably connecting a plurality of pressurized cutters to the front panel of the main arm of the normal-pressure cutter disc, the front panel of the main arm of the normal-pressure cutter disc also has pressurized cutters in addition to the normal-pressure cutters, thereby increasing the tool cutting trajectory within the limited area of ​​the cutter disc main arm, improving the cutting ability of the cutter disc cutter, and facilitating the cutting of the face and the flow of slag; the method for disassembling and assembling the pressurized cutter device inside the main arm of the normal-pressure cutter disc of the shield machine of the present invention can efficiently and quickly disassemble and replace the pressurized cutters, and at the same time, the safety of replacing the pressurized cutters in the main arm of the normal-pressure cutter disc is greatly improved compared to entering the excavation chamber to replace the pressurized cutters on the cutter disc panel, thereby avoiding serious injuries to the pressurized workers caused by accidents such as landslides at the face.

Claims

1. A method for disassembling and assembling a pressure cutter device inside a shield machine normal pressure cutter head main arm, characterized in that: The following steps are involved: S1. An opening is machined on the front panel of the main arm of the normal pressure cutter disc, and a rectangular structural box is welded behind the opening, and the structural box is used to accommodate the connection components of the pressure cutter; S2. A concave groove plate is welded at the connection between the opening and the top side of the structural box, and a flat plate is welded at the connection between the opening and the bottom side of the structural box; S3. Place the connection block with the pressure cutter welded on the front between the flat plate and the concave groove plate, so that the protrusion on the top surface of the connection block is embedded in the concave groove plate, insert the wedge block of the L-shaped connection plate into the gap between the bottom side of the connection block and the flat plate to achieve longitudinal fixation of the connection block, and then use fixing bolts to fix the vertical plate of the L-shaped connection plate to the back of the connection block to achieve transverse fixation of the connection block; S4. Connect the rear end surface of the structure box with a sealing plate to finally realize the fixed installation of the pressure cutter; S5. When the pressure cutter is worn, it is necessary to replace the pressure cutter. The specific steps are as follows: S51. The pressure workers need to wait until the pressure in the excavation chamber, air cushion chamber and cutter disc is balanced and the liquid level drops below the center line of the cutter disc before entering the inner cavity of the main arm of the normal pressure cutter disc through the double-layer chamber door of the center cone. S52, first remove the sealing plate to expose the connection assembly of the pressure cutter, loosen the fixing bolts to remove the L-shaped connector, separate the protrusion of the connecting block from the concave groove plate, and pull the connecting block connected to the pressure cutter out of the structure box for replacement; S53, repeating steps S3 and S4 to complete the installation of a new pressure cutter and restore the excavation state in which the excavation chamber is full of mud.

2. The method for disassembling and assembling a pressure cutter device according to claim 1, characterized in that: In step S1, the shape of the opening formed on the front panel of the atmospheric pressure cutter head main arm should be a rectangular structure with the same size as the inner surface of the welded structural steel box.

3. The method for disassembling and assembling a pressure cutter device according to claim 1, characterized in that: In step S2, the concave groove plate and the flat plate should be welded flush with the outer surface of the cutter head, and a wear-resistant protective block should be welded on the outer periphery.

4. The method for disassembling and assembling a pressure cutter device according to claim 1, characterized in that: In step S4, a sealing strip should be provided on the contact surface between the sealing plate and the structural box.

5. The method for disassembling and assembling a pressure cutter device according to any one of claims 1 to 4, characterized in that: In step S51, after the liquid level in the excavation chamber is lowered, the pressure of the cavity gas of the atmospheric pressure cutter head main arm should be equal to the pressure of the excavation chamber and the air cushion chamber.

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