Full-pressure-maintaining deslagging door and shield tunneling machine

Abstract

The invention relates to the technical field of tunnel construction, in particular to a full-pressure-maintaining deslagging door and a shield tunneling machine. The full-pressure-maintaining slag discharging door comprises a mounting frame, a sealing plate is arranged at a frame opening of the mounting frame and is in sealing fit with the mounting frame, slag discharging channels are correspondingly formed in the mounting frame and the sealing plate, a gate plate is movably arranged in the mounting frame, and the gate plate has a closing position for blocking the slag discharging channels and an opening position for avoiding the slag discharging channels in the moving stroke of the gate plate. And a driving mechanism for driving the flashboard to move back and forth between the closing position and the opening position is also arranged in the mounting frame. The installation frame and the sealing plate are in static sealing, when the slag discharging door is opened, even if a gap exists between the gate plate and the sealing plate or between the gate plate and the installation frame, due to the fact that the connection portion of the installation frame and the sealing plate is in sealing fit, slurry can be prevented from leaking to the outside, and due to the fact that the installation frame and the sealing plate are in static sealing, static sealing has excellent pressure bearing performance. Therefore, slurry can be prevented from leaking to the outside when high-pressure slurry passes through the slag discharging door, and the slag discharging door can be applied to a high-pressure-bearing environment without leakage.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a full-pressure slag discharge door and a shield machine. Background Art

[0002] With the increasing number of domestic tunnel construction, the slurry dual-channel shield machine is increasingly used because it can use a screw conveyor channel to discharge slag, solving the problem of clogging and sluggish discharge caused by broken strata and large-diameter pebbles. However, since the screw conveyor is connected to the mud circulation system, it needs to withstand higher pressure. The screw conveyor cylinder adopts static sealing and can withstand higher pressure, but the slag discharge door needs to be opened and closed frequently, and due to structural limitations, it cannot be used in high-pressure environments.

[0003] The Chinese utility model patent with authorization announcement number CN214499073U discloses a pressure-maintaining slag door and a shield machine. A pressure-maintaining slag door is arranged at the slag outlet of the screw conveyor. The pressure-maintaining slag door includes an automatic slag outlet door and a manual slag outlet door. The automatic slag outlet door includes a first support plate and a second support plate. An end plate is detachably connected to one end of the two support plates away from the slag outlet. An accommodating space is formed between the two support plates. A guide rail is arranged in the accommodating space. A gate plate is slidably arranged in the guide rail. The gate plate is driven to slide by an oil cylinder to block or open the slag outlet. A plurality of sealing rings are arranged between the gate plate and the first and second support plates, and the sealing rings are squeezed by a pressure plate to achieve sealing cooperation between the gate plate and the first and second support plates, so that mud will not leak to the outside when the slag outlet door is opened. A sealing member is arranged on a side surface of the slag outlet opposite to the gate plate to achieve sealing performance at the slag outlet when the slag outlet door is closed.

[0004] The seal between the gate plate and the upper and lower support plates of the existing automatic slag discharge door is a dynamic seal. The slag discharge door needs to be opened and closed frequently, and the gate plate needs to move frequently. If the sealing ring set between the gate plate and the upper and lower support plates is squeezed too tightly, it will cause a large resistance to the movement of the gate plate, affecting the movement of the gate plate. If it is squeezed too loosely, it will lead to poor sealing performance and cannot withstand high pressure. It is easy to leak in a high-pressure environment. Moreover, the frequent movement of the gate plate will cause the sealing ring to wear, and it is necessary to frequently adjust the degree of pressure plate extrusion or replace the sealing ring. In addition, the frequent movement of the gate plate will inevitably cause wear of the seal set between the slag discharge port and the gate plate, thereby reducing the sealing performance at the slag discharge port after the slag discharge door is closed, and it is easy to leak when used in a high-pressure environment. Summary of the invention

[0005] The purpose of the present invention is to provide a fully pressure-maintaining slag discharge door to solve the problem that the existing slag discharge door is prone to leakage when used in a high-pressure environment; the purpose of the present invention is also to provide a shield machine to solve the problem that the slag discharge door of the existing shield machine is prone to leakage when used in a high-pressure environment, resulting in the existing shield machine being unable to be used in high-pressure formations.

[0006] The full pressure-maintaining slag discharge door of the present invention adopts the following technical solutions: A full pressure-maintaining slag discharge door comprises a mounting frame, a sealing plate is provided at the frame opening of the mounting frame and the two are sealed together, slag discharge channels are correspondingly provided on the mounting frame and the sealing plate, a gate plate is movably provided in the mounting frame, and the gate plate has a closed position for blocking the slag discharge channel and an open position for allowing the slag discharge channel to be opened within its movable stroke, and a driving mechanism for driving the gate plate to move back and forth between the closed position and the open position is also provided in the mounting frame.

[0007] Furthermore, the frame opening of the installation frame faces upward, and a first sealing member is provided between the top of the installation frame and the sealing plate to achieve sealing cooperation between the two.

[0008] Furthermore, the slag discharge channel on the sealing plate is used to dock with the slag discharge port of the screw conveyor, and a second sealing member is provided on the end surface of the sealing plate facing the gate plate so that the gate plate forms a sealing fit with the sealing plate when in the closed position.

[0009] Furthermore, an injection channel for injecting the sealant is provided on the sealing plate, and the terminal outlet of the injection channel is located inside the second sealing member.

[0010] Furthermore, there are more than two injection channels and they are spaced apart in the circumferential direction.

[0011] Furthermore, the injection channel is an L-shaped channel, one side of the L-shaped channel horizontally extends to the outer side surface of the sealing plate, and the other side vertically extends to the end surface of the sealing plate facing the gate plate.

[0012] Furthermore, the sealing plate includes an extending portion extending into the frame opening and a pressing portion pressed against the top of the installation frame, and the first sealing member is arranged between the pressing portion and the top of the installation frame.

[0013] Furthermore, a sealing groove is provided on the top of the installation frame, and the first sealing member is installed in the sealing groove.

[0014] Furthermore, the sealing plate is detachably connected to the mounting frame.

[0015] Beneficial effects: The fully pressure-maintaining slag discharge door of the present invention is a pioneering invention. The gate plate and the driving mechanism for driving the gate plate to move are both arranged in the installation frame, which can reduce the position where leakage may occur. A sealing plate is provided at the frame opening of the installation frame and the two are sealed together. There is a static seal between the installation frame and the sealing plate. When the slag discharge door is opened, the gate plate is still in the installation frame. Even if there is a gap between the gate plate and the sealing plate or the installation frame, the sealing fit at the connection between the installation frame and the sealing plate can prevent the mud from leaking to the outside. Since there is a static seal between the installation frame and the sealing plate, the static seal has very excellent pressure-bearing performance, so when high-pressure mud passes through, it can also prevent the mud from leaking to the outside, so that the slag discharge door can be used in a high-pressure environment without leakage.

[0016] The shield machine of the present invention adopts the following technical solutions: The shield machine comprises a screw conveyor, wherein a slag discharge door is connected to the slag discharge port of the screw conveyor, and the slag discharge door comprises a mounting frame, a sealing plate is provided at the frame opening of the mounting frame and the two are sealed together, slag discharge channels are correspondingly provided on the mounting frame and the sealing plate, a gate plate is movably provided in the mounting frame, and the gate plate has a closed position for blocking the slag discharge channel and an open position for allowing the slag discharge channel within its movable stroke, and a driving mechanism for driving the gate plate to move back and forth between the closed position and the open position is also provided in the mounting frame.

[0017] Furthermore, the frame opening of the installation frame faces upward, and a first sealing member is provided between the top of the installation frame and the sealing plate to achieve sealing cooperation between the two.

[0018] Furthermore, the slag discharge channel on the sealing plate is used to dock with the slag discharge port of the screw conveyor, and a second sealing member is provided on the end surface of the sealing plate facing the gate plate so that the gate plate forms a sealing fit with the sealing plate when in the closed position.

[0019] Furthermore, an injection channel for injecting the sealant is provided on the sealing plate, and the terminal outlet of the injection channel is located inside the second sealing member.

[0020] Furthermore, there are more than two injection channels and they are spaced apart in the circumferential direction.

[0021] Furthermore, the injection channel is an L-shaped channel, one side of the L-shaped channel horizontally extends to the outer side surface of the sealing plate, and the other side vertically extends to the end surface of the sealing plate facing the gate plate.

[0022] Furthermore, the sealing plate includes an extending portion extending into the frame opening and a pressing portion pressed against the top of the installation frame, and the first sealing member is arranged between the pressing portion and the top of the installation frame.

[0023] Furthermore, a sealing groove is provided on the top of the installation frame, and the first sealing member is installed in the sealing groove.

[0024] Furthermore, the sealing plate is detachably connected to the mounting frame.

[0025] Beneficial effects: The shield machine of the present invention is an improved invention. A new slag discharge door is adopted, and the gate plate of the slag discharge door and the driving mechanism for driving the gate plate to move are both arranged in the installation frame, which can reduce the position where leakage may occur. A sealing plate is provided at the frame opening of the installation frame and the two are sealed and matched. There is a static seal between the installation frame and the sealing plate. When the slag discharge door is opened, the gate plate is still in the installation frame. Even if there is a gap between the gate plate and the sealing plate or the installation frame, the sealing match at the connection part between the installation frame and the sealing plate can prevent the mud from leaking to the outside. Since there is a static seal between the installation frame and the sealing plate, the static seal has very excellent pressure-bearing performance, so it can also prevent the mud from leaking to the outside when passing through high-pressure mud. The slag discharge door can be used in a high-pressure environment without leakage, so that the shield machine can be used in higher-pressure formations, thereby expanding the use scenarios of the shield machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a shield machine in an embodiment of the present invention when the slag discharge door is closed; Figure 2 A cross-sectional view of a shield machine in an embodiment of the present invention when a slag discharge door is closed; Figure 3 A top view of a shield machine in an embodiment of the present invention when a slag discharge door is closed; Figure 4 It is a schematic structural diagram of a shield machine in an embodiment of the present invention when a slag discharge door is opened; In the figure: 1. installation frame; 2. sealing plate; 3. gate plate; 4. first sealing member; 5. screw conveyor cylinder; 6. slag outlet; 7. slag outlet channel; 8. slag outlet equipment; 9. oil cylinder; 10. guide rail; 11. injection channel; 12. second sealing member; 13. bolts. DETAILED DESCRIPTION

[0027] The present invention is mainly used to solve the problem that the existing slag discharge door is prone to leakage when used in a high-pressure environment and cannot be used in high-pressure formations. The basic inventive concept of the present invention is: the gate plate and the driving mechanism for driving the gate plate to move are both arranged in the installation frame, and there is a static seal between the installation frame and the sealing plate. When the slag discharge door is opened, the mud can be prevented from leaking to the outside. The static seal is used instead of the dynamic seal, and the original multiple dynamic seals around the gate plate are cancelled. The static seal has very excellent pressure-bearing performance, so when high-pressure mud passes through, the mud can be prevented from leaking to the outside, realizing a high-pressure design.

[0028] Based on the above inventive concept, the embodiments of the present invention are described in detail below.

[0029] Embodiment of the shield machine of the present invention: like Figure 1-2As shown, the shield machine includes a screw conveyor, a screw conveying mechanism is provided in the screw conveyor barrel 5, a slag outlet 6 is provided on the screw conveyor barrel 5, and a slag outlet 6 is connected to the slag outlet 6. The slag outlet 6 includes a mounting frame 1, a sealing plate 2 is provided at the frame opening of the mounting frame 1, and the two are sealed to isolate the slag outlet door cavity from the outside. A slag outlet channel 7 is correspondingly provided on the mounting frame 1 and the sealing plate 2, and a gate plate 3 is movably provided in the mounting frame 1. The gate plate 3 has a closed position for blocking the slag outlet channel 7 and an open position for clearing the slag outlet channel 7 within its movable stroke. A driving mechanism for driving the gate plate 3 to move back and forth between the closed position and the open position and a guide rail 10 for guiding the movement of the gate plate 3 are also provided in the mounting frame 1. When the gate plate 3 moves to the open position, as shown in FIG. Figure 4 As shown, when the slag discharge door is opened, even if there is a gap between the gate plate 3 and the sealing plate 2 or the mounting frame 1, the connection between the mounting frame 1 and the sealing plate 2 is sealed, thereby preventing the mud from leaking to the outside. Moreover, since there is a static seal between the mounting frame 1 and the sealing plate 2, the static seal has very good pressure-bearing performance, thereby preventing the mud from leaking to the outside when high-pressure mud passes through.

[0030] Specifically, Figure 1-2 As shown, the installation frame 1 is a rectangular frame, the frame opening of the installation frame 1 faces upward, the sealing plate 2 is a rectangular plate, the sealing plate 2 is fixedly connected to the frame opening at the top of the installation frame 1, and a first sealing member 4 is provided between the top of the installation frame 1 and the sealing plate 2 to achieve a sealed fit between the two. The frame opening of the installation frame 1 faces upward, which is convenient for the assembly of the driving mechanism and the guide rail 10 in the installation frame 1. The first sealing member 4 is provided between the top of the installation frame 1 and the sealing plate 2, and the sealing plate 2 is fixedly connected to the installation frame 1 to squeeze the first sealing member 4. The first sealing member 4 is squeezed between the lower end face of the sealing plate 2 and the upper end face of the installation frame 1, so that a static seal is formed between the sealing plate 2 and the installation frame 1, there is no relative movement, and the sealing performance is reliable. In addition, the first sealing member 4 is squeezed between the lower end face of the sealing plate 2 and the upper end face of the installation frame 1, which can ensure that the sealing member 4 will not be worn when the sealing member 2 is fixedly connected to the installation frame 1 or when the sealing member 2 is removed. The sealing plate 2 and the installation frame 1 are detachably connected by bolts 13. When the parts in the installation frame 1 need to be replaced, the sealing plate 2 can be opened at any time for replacement, which is easy to operate.

[0031] The sealing plate 2 includes an extending portion extending into the frame opening and a pressing portion pressed against the top of the mounting frame 1, and the first sealing member 4 is arranged between the pressing portion and the top of the mounting frame 1. The extending portion can position the fixed connection of the sealing plate 2 to the mounting frame 1, so that the sealing plate 2 and the mounting frame 1 can be quickly aligned to achieve quick installation, and the extending portion extends into the interior of the frame opening, which can also play a certain limiting role on the sealing plate 2. In addition, the extending portion is on the inner side of the first sealing member 4, and each bolt 13 is on the outer side of the first sealing member 4, which can strengthen the pressing effect on the first sealing member 4 and make the sealing performance between the sealing plate 2 and the top of the mounting frame 1 better. A sealing groove is provided on the top of the mounting frame 1, and the first sealing member 4 is installed in the sealing groove, and the first sealing member 4 is easy to install.

[0032] The driving mechanism specifically adopts an oil cylinder 9, and two oil cylinders 9 are provided, which are symmetrically arranged on the front and rear sides of the gate plate 3. The output ends of the two oil cylinders 9 are transmission-connected with the gate plate 3. The two oil cylinders 9 are synchronously extended and retracted to drive the gate plate 3 to move left and right, thereby realizing the opening and closing of the slag discharge door. Two guide rails 10 are provided, and the gate plate 3 is slidably arranged on the two guide rails 10.

[0033] like Figure 1-2 As shown in the figure, the slag discharge channel 7 on the sealing plate 2 is connected to the slag discharge port 6 of the screw conveyor, and the slag discharge channel 7 on the mounting frame 1 is connected to the slag discharge device 8. A sealing groove is provided on the end surface of the sealing plate 2 facing the gate plate 3, and a second sealing member 12 is installed in the sealing groove so that the gate plate 3 forms a sealing match with the sealing plate 2 when in the closed position. The pressure is achieved through the seal to isolate the upper and lower parts of the slag discharge door to prevent mud leakage. Since the gate 3 needs to move frequently, the seal between the gate 3 and the sealing plate 2 is a dynamic seal. After long-term use, the second seal 12 will inevitably wear out, resulting in unreliable sealing or poor sealing effect. In order to enhance the sealing effect, an injection point is also provided beside the seal between the gate 3 and the sealing plate 2. Specifically, an injection channel 11 for injecting sealant is provided on the sealing plate 2. The injection point of the injection channel 11, i.e., the terminal outlet, is located inside the second seal 12. When the seal is unreliable or the sealing effect is poor, a sealant such as a polymer, black oil or other substances can be injected to fill the gap in the seal, thereby enhancing the sealing effect. By improving the sealing performance of the slag discharge door when it is closed, the slag discharge door is not prone to leakage when used in a high-pressure environment.

[0034] In order to further ensure that the injected sealant can fill all the leakage points and avoid the situation where some leakage points are not filled, more than two injection channels 11 are provided and arranged at intervals in the circumferential direction, and the sealant is injected into multiple injection channels 11 at the same time to increase the sealant filling area and ensure the sealing effect. Figure 3As shown in the figure, in this embodiment, there are eight injection channels 11 in total, and the injection points of the eight injection channels 11 are arranged circumferentially around the second sealing member 12 to improve the pressure bearing capacity of the seal after the slag discharge door is closed, thereby solving the leakage problem of the screw conveyor after the slag discharge door is closed in a high pressure environment.

[0035] like Figure 2 As shown in the figure, the injection channel 11 is an L-shaped channel, one side of the L-shaped channel extends horizontally to the outer side of the sealing plate 2, and the other side extends vertically to the end face of the sealing plate 2 facing the gate plate 3. The length of the injection channel 11 is shortened as much as possible to maintain the injection pressure of the injected sealant sufficient to support the sealant to reach the leakage point, while saving the amount of sealant.

[0036] In the slag discharge door of the present invention, a static seal is used instead of a dynamic seal, and the original multiple dynamic seals around the gate plate 3 are eliminated, thereby realizing a high-pressure design. At the same time, the sealing performance of the dynamic seal when the slag discharge door is closed is improved, so that the purpose of high pressure and no leakage can be achieved in both the open and closed states of the slag discharge door, thereby making up for the shortcomings of the screw conveyor in high pressure bearing, helping to apply the mud and water dual-channel shield machine to higher pressure formations, and expanding the use scenarios of the mud and water dual channels.

[0037] Of course, the present invention is not limited to the implementation methods in the above embodiments.

[0038] For example, in another embodiment, the frame opening of the mounting frame faces downward, and the sealing plate is fixedly connected to the bottom of the mounting frame. A first sealing member is provided between the bottom of the mounting frame and the sealing plate to achieve a sealed fit between the two. At this time, a slag discharge channel is provided on the bottom frame edge of the mounting frame, and the slag discharge channel is used to dock with the slag discharge port of the screw conveyor. A second sealing member is provided on the inner side surface of the bottom frame edge of the mounting frame so that the gate plate forms a sealed fit with the bottom frame edge of the mounting frame when it is in the closed position, and other structures are adaptively adjusted accordingly.

[0039] For example, in another embodiment, the frame opening of the mounting frame faces upward, a sealing groove is provided on the inner side surface of the frame opening of the mounting frame, a first sealing member is provided in the sealing groove, and a sealing plate is inserted into the mounting frame, and the sealing plate radially squeezes the first sealing member to achieve sealing cooperation with the mounting frame.

[0040] For example, in another embodiment, the sealing plate may have one, two, three or other injection channels, and leakage may occur at any position in the circumferential direction. The number of injection channels is not limited, as long as the injected sealant can fill all the leakage points. Similarly, the structure of the injection channel is not limited, and the injection channel can be a curved channel or an inclined channel.

[0041] For example, in another embodiment, the sealing plate is directly pressed against the top of the mounting frame, and the sealing plate has no extending portion extending into the frame opening.

[0042] For example, in another embodiment, a sealing groove is provided on an end surface of the sealing plate facing the mounting frame, and the first sealing member is provided in the sealing groove on the sealing plate.

[0043] For example, in another embodiment, the sealing plate and the mounting frame may also be welded or riveted together.

[0044] The present invention also provides an embodiment of a full-pressure-maintaining slag discharge door, the specific structure of which is the same as the structure of the slag discharge door in the above-mentioned shield machine embodiment, and will not be repeated here.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A full pressure-maintaining slag discharge door, characterized in that: It includes an installation frame, a sealing plate is provided at the frame opening of the installation frame and the two are sealed together, slag discharge channels are provided on the installation frame and the sealing plate respectively, a gate plate is movably provided in the installation frame, and the gate plate has a closed position for blocking the slag discharge channel and an open position for allowing the slag discharge channel within its movable stroke, and a driving mechanism for driving the gate plate to move back and forth between the closed position and the open position is also provided in the installation frame.

2. The full pressure-maintaining slag discharge door according to claim 1, characterized in that: The frame opening of the installation frame faces upwards, and a first sealing member is arranged between the top of the installation frame and the sealing plate to achieve sealing cooperation between the two.

3. The full pressure-maintaining slag discharge door according to claim 2, characterized in that: The slag discharge channel on the sealing plate is used to dock with the slag discharge port of the screw conveyor. A second sealing member is provided on the end surface of the sealing plate facing the gate plate so that the gate plate forms a sealing fit with the sealing plate when the gate plate is in the closed position.

4. The full pressure-maintaining slag discharge door according to claim 3 is characterized in that: An injection channel for injecting the sealant is provided on the sealing plate, and the terminal outlet of the injection channel is located inside the second sealing member.

5. The full pressure-maintaining slag discharge door according to claim 4, characterized in that: There are more than two injection channels and they are spaced apart in the circumferential direction.

6. The full pressure-maintaining slag discharge door according to claim 4, characterized in that: The injection channel is an L-shaped channel, one side of the L-shaped channel horizontally extends to the outer side of the sealing plate, and the other side vertically extends to the end surface of the sealing plate facing the gate plate.

7. The full pressure-maintaining slag discharge door according to any one of claims 2 to 6, characterized in that: The sealing plate comprises an extending portion extending into the frame opening and a pressing portion pressed against the top of the installation frame, and a first sealing member is arranged between the pressing portion and the top of the installation frame.

8. The full pressure-maintaining slag discharge door according to any one of claims 2 to 6, characterized in that: A sealing groove is provided on the top of the installation frame, and the first sealing member is installed in the sealing groove.

9. The full pressure-maintaining slag discharge door according to any one of claims 1 to 6, characterized in that: The sealing plate is detachably connected to the installation frame.

10. A shield machine, comprising a screw conveyor, wherein a slag discharge port of the screw conveyor is connected to a slag discharge door, characterized in that: The slag discharge door is the full pressure-maintaining slag discharge door as described in any one of claims 1-9.

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