Deslagging system and heading machine

Abstract

The utility model provides a deslagging system and a tunneling machine, and belongs to the field of tunneling equipment. The residue discharging system comprises a transition box and a vacuum residue suction device, a residue receiving opening used for receiving residue soil is formed in the top of the transition box, a spiral residue conveying device used for conveying the residue soil from bottom to top is arranged in the transition box, and the spiral residue conveying device comprises a vertically-arranged spiral blade and a driving structure used for driving the spiral blade to rotate; the spiral blade is sleeved with a cylindrical housing, the lower end of the housing is provided with a slag inlet communicated with the transition box, and the upper end of the housing is provided with a slag outlet communicated with an inlet of the vacuum slag suction device. The tunneling machine comprises a cutterhead, a shield body, a spiral conveyor and a slag discharging system. According to the slag discharging device, slag is discharged in an upward suction mode, the slag outlet is prevented from being buried by slag, the slag outlet is prevented from being blocked, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of tunnel boring equipment, and particularly relates to a slag discharging system and a tunneling machine. Background Art

[0002] Generally, the soil excavated by the cutter head of a tunneling machine is first conveyed to a belt conveyor by a screw conveyor, then transferred to the end of the rear support system by the belt conveyor, and finally transported out of the tunnel by a trolley. When the space in the tunnel is limited, it is impossible to use a transport trolley to transport the slag, and it is also difficult to install a belt conveyor, making it difficult to convey the muck.

[0003] The existing Chinese utility model patent with the authorization announcement number CN209354155U discloses a slag discharging system for a new type of shield machine, which solves the problem of difficult slag discharging in a narrow tunnel space. The slag discharging system of the shield machine includes a stirring device, a vacuum slag suction device, and a modifier adding device. The stirring device includes a stirring tank body and a spiral blade horizontally arranged in the stirring tank body. After the screw conveyor of the shield machine discharges the muck into the stirring tank body, it is transferred to the other end of the stirring tank body by the spiral blade. An outlet for discharging slag connected to the vacuum slag suction device is arranged at the bottom of this end of the stirring tank body, so that the muck in the stirring tank body can be sucked out by the vacuum slag suction device.

[0004] The slag discharging system of the shield machine has the following problems in the process of use: First, since the slag outlet is arranged at the bottom of the stirring tank body (i.e., the transition box), the muck is very easy to bury the slag outlet. When the discharged slag is clay with poor fluidity, it is difficult for the outside air to enter the vacuum slag suction device together with the clay from the slag outlet, so the slag outlet is easily blocked by the clay, resulting in equipment shutdown; Second, after the slag outlet is blocked, the slag outlet and the area above it are buried by clay, and it is difficult for the slag discharging system to dredge itself, seriously affecting the construction efficiency; In addition, when encountering a water-rich stratum, the slag discharging system of the shield machine will discharge the mixture of slag and water out of the tunnel, and the water-rich muck (or slag mud) cannot be directly transported away by the slag truck, so it is necessary to add an artificial sedimentation tank or screening equipment outside the tunnel to separate the slag and water, resulting in low construction efficiency and high construction cost. Summary of the Utility Model

[0005] One object of the utility model is to provide a slag discharging system to solve the technical problem that the slag outlet is easily blocked due to the slag outlet of the transition box being arranged at the bottom in the prior art.

[0006] Another object of the utility model is to provide a tunneling machine to solve the above technical problems.

[0007] To achieve the above object, the technical solution of the slag discharging system provided by the utility model is:

[0008] A slag discharging system includes a transition box and a vacuum slag suction device. The top of the transition box is provided with a slag receiving port for receiving muck. A screw slag conveying device for conveying the muck from bottom to top is arranged in the transition box. The screw slag conveying device includes a vertically arranged screw blade and a driving structure for driving the screw blade to rotate. A cylindrical cover is sleeved outside the screw blade. The lower end of the cover is provided with a slag inlet communicating with the transition box, and the upper end of the cover is provided with a slag outlet connected to the inlet of the vacuum slag suction device.

[0009] As a further improvement, the vacuum slag suction device includes a slag discharging pipeline communicated with the slag outlet. A slag storage tank and a vacuum pump are sequentially arranged on the slag discharging pipeline along the slag discharging direction. The end of the slag discharging pipeline is connected to the atmosphere. The vacuum slag suction device further includes a backwashing pipe and a backwashing air inlet pipe. The inlet and outlet of the backwashing pipe are both connected to the slag discharging pipeline. The inlet of the backwashing pipe is located downstream of the vacuum pump, and the outlet of the backwashing pipe is located upstream of the vacuum pump. One end of the backwashing air inlet pipe is connected to the slag discharging pipeline and the other end is connected to the atmosphere. The backwashing air inlet pipe is located between the outlet of the backwashing pipe and the vacuum pump. Valves are arranged on the backwashing pipe, the backwashing air inlet pipe, the slag discharging pipeline between the outlet of the backwashing pipe and the outlet of the backwashing air inlet pipe, and the slag discharging pipeline downstream of the inlet of the backwashing pipe.

[0010] As a further improvement, the outlet of the backwashing pipe is located upstream of the slag storage tank, and the backwashing air inlet pipe is communicated with the slag storage tank.

[0011] As a further improvement, the vacuum slag suction device includes a slag discharging pipeline communicated with the slag outlet. One end of the slag discharging pipeline far from the slag outlet is connected with a suction branch and a backwashing branch. A slag storage tank and a vacuum pump are sequentially arranged on the suction branch along the suction direction. The end of the suction branch is connected to the atmosphere. A backwashing air pump is arranged on the backwashing branch, and the end of the backwashing branch is communicated with the atmosphere. Valves for controlling the on-off of the corresponding branch are arranged on both the backwashing branch and the suction branch.

[0012] As a further improvement, an air inlet is arranged at the upper end of the cover, and an air inlet valve is arranged at the air inlet.

[0013] As a further improvement, a drain outlet is arranged at the upper end of the cover. A drain pipe is connected to the drain outlet, and the outlet of the drain pipe is connected to the transition box.

[0014] As a further improvement, the slag discharging system further includes a sewage collection device. The sewage collection device includes a sewage tank and a water pump. A sewage discharge port is arranged at the bottom of the transition box, and a sewage inlet is arranged at the upper part of the sewage tank. The sewage discharge port is connected to the inlet of the water pump through a pipeline, and the outlet of the water pump is connected to the sewage inlet of the sewage tank through a pipeline.

[0015] As a further improvement, a water outlet is provided at the lower part of the sewage tank, an inlet is provided at the upper part of the transition tank or the housing, the water outlet is connected to the inlet of the water pump through a pipeline, the inlet is connected to the outlet of the water pump through a pipeline, and valves are provided on the pipeline between the water pump and the sewage tank and on the pipeline between the water pump and the transition tank or the housing.

[0016] As a further improvement, the sewage collection device further includes a liquid injection pump. A water outlet is provided at the lower part of the sewage tank, an inlet is provided at the upper part of the transition tank or the housing, the water outlet is connected to the inlet of the liquid injection pump, and the inlet is connected to the outlet of the liquid injection pump.

[0017] As a further improvement, at least one tank wall of the transition tank is an inclined wall for guiding the muck and causing the muck to converge towards the bottom of the transition tank.

[0018] The beneficial effects are as follows: The slag discharging system provided by the present utility model belongs to an invention creation with a changed element relationship. The slag discharging system uses a spiral slag conveying device to convey the muck in the transition tank from bottom to top. After the muck reaches the top of the spiral slag conveying device, it is sucked away by the vacuum slag sucking device. Since the slag outlet is provided at the top of the spiral slag conveying device, the slag outlet is not easily buried by the muck, which can ensure that air and muck continuously pass through the slag outlet and enter the vacuum slag sucking device together, facilitating the prevention of the slag outlet from being blocked and effectively improving the construction efficiency.

[0019] To achieve the above object, the technical solution of the roadheader provided by the present utility model is as follows:

[0020] A roadheader includes a cutter head, a shield body, and a screw conveyor. It further includes a slag discharging system. The slag discharging system includes a transition tank and a vacuum slag sucking device. A slag receiving port for receiving muck is provided at the top of the transition tank. A spiral slag conveying device for conveying the muck from bottom to top is arranged in the transition tank. The spiral slag conveying device includes a vertically arranged spiral blade and a driving structure for driving the spiral blade to rotate. A cylindrical housing is sleeved outside the spiral blade. The lower end of the housing is provided with a slag inlet communicating with the transition tank, and the upper end of the housing is provided with a slag outlet communicating with the inlet of the vacuum slag sucking device.

[0021] As a further improvement, the vacuum slag sucking device includes a slag discharging pipeline communicating with the slag outlet. A slag storage tank and a vacuum pump are successively arranged on the slag discharging pipeline along the slag discharging direction. The end of the slag discharging pipeline is connected to the atmosphere. The vacuum slag sucking device further includes a backflush pipe and a backflush inlet pipe. The inlet and outlet of the backflush pipe are both connected to the slag discharging pipeline. The inlet of the backflush pipe is located downstream of the vacuum pump, and the outlet of the backflush pipe is located upstream of the vacuum pump. One end of the backflush inlet pipe is connected to the slag discharging pipeline and the other end is connected to the atmosphere. The backflush inlet pipe is located between the outlet of the backflush pipe and the vacuum pump. Valves are provided on the backflush pipe, the backflush inlet pipe, the slag discharging pipeline between the outlet of the backflush pipe and the outlet of the backflush inlet pipe, and the slag discharging pipeline downstream of the inlet of the backflush pipe.

[0022] As a further improvement, the outlet of the backwashing pipe is located upstream of the slag storage tank, and the backwashing intake pipe is communicated with the slag storage tank.

[0023] As a further improvement, the vacuum slag suction device includes a slag discharge pipeline communicated with the slag outlet. One end of the slag discharge pipeline far from the slag outlet is connected with a suction branch and a backwashing branch. Along the suction direction, a slag storage tank and a vacuum pump are sequentially arranged on the suction branch. The end of the suction branch is communicated with the atmosphere. An air pump for backwashing is arranged on the backwashing branch, and the end of the backwashing branch is communicated with the atmosphere. Valves for controlling the on-off of the corresponding branches are arranged on both the backwashing branch and the suction branch.

[0024] As a further improvement, an air inlet is arranged at the upper end of the housing, and an air inlet valve is arranged at the air inlet.

[0025] As a further improvement, a drain outlet is arranged at the upper end of the housing, and a drain pipe is connected to the drain outlet. The outlet of the drain pipe is communicated with the transition box.

[0026] As a further improvement, the slag discharge system further includes a sewage collection device. The sewage collection device includes a sewage tank and a water pump. A sewage discharge port is arranged at the bottom of the transition box, and a sewage inlet is arranged at the upper part of the sewage tank. The sewage discharge port is connected with the inlet of the water pump through a pipeline, and the outlet of the water pump is connected with the sewage inlet of the sewage tank through a pipeline.

[0027] As a further improvement, a water outlet is arranged at the lower part of the sewage tank, and a water inlet is arranged at the upper part of the transition box or the housing. The water outlet is connected with the inlet of the water pump through a pipeline, and the water inlet is connected with the outlet of the water pump through a pipeline. Valves are arranged on the pipeline between the water pump and the sewage tank and on the pipeline between the water pump and the transition box or the housing.

[0028] As a further improvement, the sewage collection device further includes a liquid injection pump. A water outlet is arranged at the lower part of the sewage tank, and a water inlet is arranged at the upper part of the transition box or the housing. The water outlet is connected with the inlet of the liquid injection pump, and the water inlet is connected with the outlet of the liquid injection pump.

[0029] As a further improvement, at least one box wall of the transition box is an inclined wall for guiding the muck and converging the muck to the bottom of the transition box.

[0030] The beneficial effects are as follows: The roadheader provided by the utility model is an improvement on the prior art. The slag discharge system of the roadheader uses a spiral slag conveying device to convey the muck in the transition box from bottom to top. After the muck reaches the top of the spiral slag conveying device, it is sucked away by the vacuum slag suction device. Since the slag outlet is arranged at the top of the spiral slag conveying device, the slag outlet is not easily buried by the muck, and it can ensure that air and muck continuously pass through the slag outlet into the vacuum slag suction device, which is beneficial to avoiding the blockage of the slag outlet and effectively improving the construction efficiency. Brief Description of the Drawings

[0031] Figure 1 This is a schematic structural diagram of Embodiment 1 of the roadheader in the present utility model;

[0032] Figure 2 This is a schematic structural diagram of Embodiment 2 of the roadheader in the present utility model;

[0033] Figure 3 This is a schematic structural diagram of Embodiment 3 of the roadheader in the present utility model;

[0034] Figure 4 This is a schematic structural diagram of Embodiment 4 of the roadheader in the present utility model;

[0035] Figure 5 This is a schematic structural diagram of Embodiment 5 of the roadheader in the present utility model;

[0036] Figure 6 This is a schematic structural diagram of Embodiment 6 of the roadheader in the present utility model.

[0037] Description of the Reference Numerals:

[0038] 1. Cutter head; 2. Shield body; 3. Screw conveyor; 4. Transition box; 5. Screw blade; 6. Housing; 7. Driving motor; 8. Slag inlet; 9. Slag outlet; 10. Slag discharge pipeline; 11. Slag storage tank; 12. Vacuum pump; 13. Backflush pipe; 14. Backflush inlet pipe; 15. First switching valve; 16. Second switching valve; 17. Third switching valve; 18. Fourth switching valve; 19. Sewage tank; 20. Water pump; 21. Drain port; 22. Sewage inlet; 23. Water outlet; 24. Water inlet; 25. First cut-off valve; 26. Second cut-off valve; 27. Third cut-off valve; 28. Fourth cut-off valve; 29. Drain pipe; 30. Drain switch valve; 31. Intake duct; 32. Intake switch valve; 33. Isolation valve; 34. Liquid injection pump; 35. Suction branch; 36. Backflush branch; 37. Backflush air pump. Detailed Embodiments

[0039] The following further describes the present utility model in detail with reference to the embodiments.

[0040] To solve the problems in the prior art, the basic concept of the present utility model is to prevent slag discharge by upward suction, thereby avoiding the slag outlet being buried by muck and preventing the slag outlet from being blocked.

[0041] Specific Embodiment 1 of the roadheader provided by the present utility model:

[0042] A roadheader, see the attached Figure 1, including a main machine part and a slag discharging system. The main machine part includes a cutter head 1, a shield body 2 and a screw conveyor 3. The structure of the main machine part is the same as that of the prior art and will not be elaborated here.

[0043] The slag discharging system includes a transition box 4, a screw slag conveying device, a vacuum slag suction device and a sewage collection device.

[0044] The top of the transition box 4 is an open structure, and this open structure is a slag receiving port for receiving the muck discharged from the screw conveyor 3. One side wall of the transition box 4 is an inclined wall, and this inclined wall is located below the outlet of the screw conveyor 3, so that the muck in the transition box 4 converges towards the bottom of the transition box 4.

[0045] The screw slag conveying device includes a screw blade 5, a driving structure for driving the rotation of the screw blade 5, and a cylindrical housing 6 sleeved outside the screw blade 5. The screw blade 5 is vertically installed in the transition box 4, and the lower end of the screw blade 5 is located at the bottom of the transition box 4. The driving structure is located below the transition box 4, specifically a driving motor 7. In other embodiments, the driving structure can also be a hydraulic motor. The housing 6 is fixedly connected to the non-inclined side wall of the transition box 4. The lower end of the housing 6 is provided with a slag inlet 8 communicating with the transition box 4, and the upper end of the housing 6 is provided with a slag outlet 9 connected to the inlet of the vacuum slag suction device. The screw slag conveying device can convey the muck converged at the bottom in the transition box 4 upwards.

[0046] The vacuum slag suction device includes a slag discharging pipeline 10. One end of the slag discharging pipeline 10 is communicated with the slag outlet 9 and this end is the inlet of the vacuum slag suction device. The other end of the slag discharging pipeline 10 is communicated with the atmosphere. A storage slag tank 11 and a vacuum pump 12 are sequentially arranged on the slag discharging pipeline 10 along the slag discharging direction. The vacuum pump 12 is used to evacuate the storage slag tank 11 to make the inside of the storage slag tank 11 in a negative pressure state, so that the muck at the slag outlet 9 of the screw slag conveying device is sucked into the slag removal tank. After the storage slag tank 11 is filled, the storage slag tank 11 is opened, and a transport vehicle is used to transfer the muck away. Both the storage slag tank 11 and the vacuum pump 12 are arranged on the ground, so they do not occupy the space in the tunnel and are suitable for tunnel construction with a narrow space.

[0047] The vacuum slag suction device further includes a backflush pipe 13 and a backflush inlet pipe 14. Both the inlet and the outlet of the backflush pipe 13 are connected to the slag discharging pipeline 10. Among them, the inlet of the backflush pipe 13 is located downstream of the vacuum pump 12, and the outlet of the backflush pipe 13 is located upstream of the vacuum pump 12. One end of the backflush inlet pipe 14 is connected to the slag discharging pipeline 10 and the other end is connected to the atmosphere. Specifically, the outlet of the backflush pipe 13 is located upstream of the storage slag tank 11, and the backflush inlet pipe 14 is connected to the storage slag tank 11.

[0048] A first switching valve 15 and a second switching valve 16 are respectively installed on the backflush pipe 13 and the backflush inlet pipe 14. A third switching valve 17 is arranged at the end of the slag discharge pipeline 10 at a position downstream of the inlet of the backflush pipe 13. A fourth switching valve 18 is arranged on the slag discharge pipeline 10 between the outlet of the backflush pipe 13 and the slag storage tank 11. The above valves are all used to switch the vacuum slag suction device between two working states.

[0049] In the normal working state of the vacuum slag suction device, the first switching valve 15 on the backflush pipe 13 and the second switching valve 16 on the backflush inlet pipe 14 are in the closed state, and the third switching valve 17 and the fourth switching valve 18 on the slag discharge pipeline 10 are in the open state. The slag discharge pipeline 10 can normally suck the muck into the slag storage tank 11. When the slag outlet 9 of the screw slag conveying device is blocked, the third switching valve 17 and the fourth switching valve 18 on the slag discharge pipeline 10 can be closed, and the valves on the backflush pipe 13 and the backflush inlet pipe 14 can be opened. At this time, the backflush inlet pipe 14 can provide air intake for the vacuum pump 12, and the compressed gas pumped out by the vacuum pump 12 flows reversely into the slag discharge pipeline 10 through the backflush pipe 13, and finally the muck blocked in the slag outlet 9 of the screw slag conveying device is blown out by air pressure to achieve self-unblocking.

[0050] Before backflushing, it is also necessary to first reverse the spiral blade 5 of the screw slag conveying device to discharge the muck in the screw slag conveying device downward, so that a larger space is formed in the upper part of the screw slag conveying device, that is, below the slag outlet 9 of the screw slag conveying device, so as to facilitate the muck blocked in the slag outlet 9 to be blown out. Compared with the prior art, since the slag outlet 9 is arranged at the top of the screw slag conveying device, the blown-out muck will fall downward and will not bury the slag outlet 9 again, and the dredging effect is better.

[0051] The sewage collection device includes a sewage tank 19 and a water pump 20, and the sewage tank 19 and the water pump 20 are arranged in the tunnel. A sewage discharge port 21 is arranged at the bottom of the transition tank 4, and a sewage inlet 22 is arranged at the upper part of the sewage tank 19. The sewage discharge port 21 of the transition tank 4 is connected to the inlet of the water pump 20 through a pipeline, and the outlet of the water pump 20 is connected to the sewage inlet 22 of the sewage tank 19 through a pipeline. A water outlet 23 is arranged at the lower part of the sewage tank 19, and a water inlet 24 is arranged at the upper part of the housing 6. The water outlet 23 of the sewage tank 19 is connected to the inlet of the water pump 20 through a pipeline, and the water inlet 24 of the housing 6 is connected to the outlet of the water pump 20 through a pipeline. A first cut-off valve 25 is arranged on the pipeline between the outlet of the water pump 20 and the water inlet 24 of the housing 6, a second cut-off valve 26 is arranged on the pipeline between the inlet of the water pump 20 and the water outlet 23 of the sewage tank 19, a third cut-off valve 27 is arranged on the pipeline between the outlet of the water pump 20 and the sewage inlet 22 of the sewage tank 19, and a fourth cut-off valve 28 is arranged on the pipeline between the inlet of the water pump 20 and the sewage discharge port 21 of the transition tank 4.

[0052] When the water content of the slag discharged from the screw conveyor 3 is relatively high, a slag-water mixture will be formed in the transition box 4. When the screw slag conveying device rotates forward, the solid slag in the slag-water mixture can be conveyed upward, and the sewage will flow to the bottom of the transition box 4 naturally under the action of gravity. At this time, the first cut-off valve 25 and the second cut-off valve 26 are closed, and at the same time, the third cut-off valve 27 and the fourth cut-off valve 28 are opened. The sewage in the transition box 4 is pumped by the water pump 20 into the sewage tank 19 to achieve slag-water separation, eliminating the need to set up a slag-water separation device outside the tunnel, which is conducive to improving the construction efficiency.

[0053] When the slag discharging system temporarily stops discharging slag, the first cut-off valve 25 and the second cut-off valve 26 are opened, and the third cut-off valve 27 and the fourth cut-off valve 28 are closed. At this time, the water in the sewage tank 19 is pumped by the water pump 20 into the screw slag conveying device, and at the same time, the spiral blades 5 of the screw slag conveying device are reversed. On the one hand, this can wash the spiral blades 5, and on the other hand, it can dilute and agitate the muck in the transition box 4 to prevent the muck from caking in the transition box 4.

[0054] When the water content of the muck is too low and its fluidity becomes poor, the water in the sewage tank 19 can also be pumped into the screw slag conveying device to improve the muck, enhancing its fluidity. In other embodiments, the water inlet 24 can also be provided on the box wall of the transition box 4, so that the water in the sewage tank 19 can be directly pumped into the transition box 4 by the water pump 20. The sewage tank 19 is also provided with an interface for supplementing water inward and an interface for discharging excess water, which are not shown in the drawings.

[0055] A drain port is provided on the upper side wall of the housing 6 of the screw slag conveying device. The drain port is connected to a drain pipe 29, and the end of the drain pipe 29 extends into the transition box 4. A drain switch valve 30 is installed on the drain pipe 29. When the water content of the muck is relatively high, or the rotation speed of the spiral blades 5 of the screw slag conveying device is relatively fast, causing the water in the muck to be brought to the upper end of the screw slag conveying device, the drain switch valve 30 can also be opened to enable the water to drain from the drain port into the transition box 4, improving the slag-water separation effect.

[0056] An air inlet is also provided on the upper side wall of the housing 6 of the spiral slag conveying device. The air inlet is connected to an air inlet conduit 31, and an air inlet switch valve 32 is provided on the air inlet conduit 31. During the normal slag discharging process, the vacuum slag suction device conveys the muck by suction. If the slag outlet 9 and the slag discharging pipeline 10 are filled with muck, it is very easy to cause blockage. Therefore, it is necessary to suck in a part of air during the slag suction process so that the slag discharging pipeline 10 is in a state of a mixture of muck and air, avoiding the phenomenon of blockage. If the muck is relatively loose, the sucked air can be the air in the transition box 4, and this part of the air flows upward from the inlet of the spiral conveying device to reach the slag outlet 9. If the muck in the spiral conveying device is dense and the air cannot flow upward, the air inlet switch valve 32 can be opened to send air in from the air inlet to ensure smooth slag discharging.

[0057] Both the drain outlet and the air inlet can be determined whether to be provided according to the actual working conditions.

[0058] The air inlet switch valve 32 can be an ordinary switch valve or a one-way valve. When the water content of the muck is relatively large and the drain switch valve 30 needs to be opened, the water can be discharged from the drain outlet. At this time, if the air inlet switch valve 32 is a one-way valve, it can ensure one-way air intake and prevent water drainage.

[0059] An isolation valve 33 is provided on the slag discharging pipeline 10 between the slag outlet 9 of the housing 6 and the outlet of the backwashing pipe 13 to cut off the connection between the vacuum slag suction device and the spiral conveying device when the slag discharging system stops, avoiding unexpected situations.

[0060] Each valve in this embodiment can be a manual valve or a solenoid valve. In other embodiments of this embodiment, the above valves can be changed according to the actual situation. For example, the first cut-off valve 25 and the third cut-off valve 27 are replaced with two-way three-way valves. Specifically, the inlet of the two-way three-way valve is connected to the outlet of the water pump 20, and the two outlets of the two-way three-way valve are respectively connected to the sewage inlet 22 of the sewage tank 19 and the water inlet 24 of the housing 6 through pipelines. In this way, the functions of the original first cut-off valve 25 and the third cut-off valve 27 can also be achieved by using one two-way three-way valve. Similarly, the second cut-off valve 26 and the fourth cut-off valve 28 can also be replaced with two-way three-way valves, which will not be elaborated here.

[0061] Specific embodiment 2 of the roadheader provided by the present utility model:

[0062] This embodiment is based on embodiment 1. The difference from embodiment 1 is that, referring to the appendix Figure 2 , in this embodiment, the water pump 20 is only used to pump out the sewage, and a liquid injection pump 34 is additionally provided to inject water into the transition box 4. The water outlet 23 of the sewage tank 19 is connected to the inlet of the liquid injection pump 34 through a pipeline, and the water inlet 24 on the housing 6 is connected to the outlet of the liquid injection pump 34 through a pipeline.

[0063] In this embodiment, valves are also provided on both the sewage discharge and water injection routes to facilitate connecting or closing the corresponding routes as needed.

[0064] Compared with Embodiment 1, in this embodiment, water injection and sewage discharge can be carried out simultaneously, so that the transition box 4 can be flushed after the construction is completed.

[0065] Specific Embodiment 3 of the roadheader provided by the present utility model:

[0066] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that, referring to the appendix Figure 3 , in this embodiment, there is no water outlet on the sewage tank 19, and there is no water inlet on the housing 6. The water pump 20 is only used to pump sewage out of the transition box 4.

[0067] Specific Embodiment 4 of the roadheader provided by the present utility model:

[0068] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that, referring to the appendix Figure 4 , in this embodiment, the sewage tank and the water pump are not provided.

[0069] This embodiment is applicable to the working conditions with less water content in the muck. In this kind of working condition, the slag-free system in this embodiment is simpler and more flexible than that in Embodiment 1.

[0070] Specific Embodiment 5 of the roadheader provided by the present utility model:

[0071] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that, referring to the appendix Figure 5 , in this embodiment, the backflush pipe and the backflush air inlet pipe are not provided. The vacuum pump 12 is only used for sucking and discharging slag.

[0072] In this embodiment, the slag discharge pipeline 10 is connected with a suction branch 35 and a backflush branch 36. The slag storage tank 11 and the vacuum pump 12 are arranged on the suction branch 35. A backflush air pump 37 is arranged on the backflush branch 36. The ends of both the backflush branch 36 and the suction branch 35 are communicated with the atmosphere.

[0073] Valves are arranged on both the suction branch 35 and the backflush branch 36 to control the on-off of the two branches. When discharging slag normally, the backflush branch 36 is in the closed state and the suction branch 35 is in the open state; after the slag outlet 9 is blocked, the suction branch 35 is closed and the backflush branch 36 is opened for backflush operation.

[0074] Specific Embodiment 6 of the roadheader provided by the present utility model:

[0075] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that, referring to the appendix Figure 6, in this embodiment, the backflush pipe and the backflush intake pipe are not provided.

[0076] Since the slag discharge port 9 is arranged at the upper end of the spiral slag conveying device, the slag discharge port 9 is not easily blocked. If there is less muck with poor fluidity in the construction stratum, the roadheader provided by this embodiment can also smoothly carry out the slag discharge operation, and the structure is simpler.

[0077] Specific embodiment of the slag discharge system provided by the present utility model:

[0078] This slag discharge system is the slag discharge system described in any one of Embodiments 1-6 of the above-mentioned roadheader, and will not be elaborated here.

[0079] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions recorded in the foregoing embodiments without creative labor, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A slag discharging system, characterized in that, It includes a transition box and a vacuum slag suction device. The top of the transition box is provided with a slag receiving port for receiving muck. A screw slag conveying device for conveying muck from bottom to top is arranged in the transition box. The screw slag conveying device includes a vertically arranged screw blade and a driving structure for driving the screw blade to rotate. A cylindrical cover is sleeved outside the screw blade. The lower end of the cover is provided with a slag inlet communicating with the transition box, and the upper end of the cover is provided with a slag outlet connected to the inlet of the vacuum slag suction device.

2. The slag discharging system according to claim 1, characterized in that, The vacuum slag suction device includes a slag outlet pipeline communicating with the slag outlet. A slag storage tank and a vacuum pump are sequentially arranged on the slag outlet pipeline along the slag outlet direction. The end of the slag outlet pipeline is connected to the atmosphere. The vacuum slag suction device further includes a backflush pipe and a backflush inlet pipe. The inlet and outlet of the backflush pipe are both connected to the slag outlet pipeline. The inlet of the backflush pipe is located downstream of the vacuum pump, and the outlet of the backflush pipe is located upstream of the vacuum pump. One end of the backflush inlet pipe is connected to the slag outlet pipeline and the other end is connected to the atmosphere. The backflush inlet pipe is located between the outlet of the backflush pipe and the vacuum pump. Valves are arranged between the backflush pipe, the backflush inlet pipe, and the slag outlet pipeline between the outlet of the backflush pipe and the outlet of the backflush inlet pipe, and on the slag outlet pipeline downstream of the inlet of the backflush pipe.

3. The slag discharging system according to claim 2, characterized in that, The outlet of the backflush pipe is located upstream of the slag storage tank, and the backflush inlet pipe is communicated with the slag storage tank.

4. The slag discharging system according to claim 1, characterized in that, The vacuum slag suction device includes a slag outlet pipeline communicating with the slag outlet. One end of the slag outlet pipeline away from the slag outlet is connected with a suction branch and a backflush branch. A slag storage tank and a vacuum pump are sequentially arranged on the suction branch along the suction direction. The end of the suction branch is connected to the atmosphere. A backflush air pump is arranged on the backflush branch. The end of the backflush branch is communicated with the atmosphere. Valves for controlling the on-off of the corresponding branch are arranged on both the backflush branch and the suction branch.

5. The slag discharging system according to any one of claims 1-4, characterized in that, The upper end of the cover is provided with an air inlet, and an air inlet valve is arranged at the air inlet.

6. The slag discharging system according to any one of claims 1-4, characterized in that The upper end of the cover is provided with a drain outlet, and a drain pipe is connected to the drain outlet. The outlet of the drain pipe is connected to the transition box.

7. The slag discharging system according to any one of claims 1-4, characterized in that, The slag discharging system further includes a sewage collection device. The sewage collection device includes a sewage tank and a water pump. A sewage discharge port is arranged at the bottom of the transition box. A sewage inlet is arranged at the upper part of the sewage tank. The sewage discharge port is connected to the inlet of the water pump through a pipeline, and the outlet of the water pump is connected to the sewage inlet of the sewage tank through a pipeline.

8. The slag discharging system according to claim 7, characterized in that, A water outlet is arranged at the lower part of the sewage tank. A water inlet is arranged at the upper part of the transition box or the cover. The water outlet is connected to the inlet of the water pump through a pipeline, and the water inlet is connected to the outlet of the water pump through a pipeline. Valves are arranged on the pipeline between the water pump and the sewage tank and on the pipeline between the water pump and the transition box or the cover.

9. The slag discharging system according to claim 7, characterized in that The sewage collection device further includes a liquid injection pump. A water outlet is arranged at the lower part of the sewage tank. A water inlet is arranged at the upper part of the transition box or the cover. The water outlet is connected to the inlet of the liquid injection pump, and the water inlet is connected to the outlet of the liquid injection pump.

10. The slag discharging system according to any one of claims 1-4, characterized in that, At least one box wall of the transition box is an inclined wall for guiding muck and causing the muck to converge towards the bottom of the transition box.

11. A tunneling machine, comprising a cutter head, a shield body, and a screw conveyor, characterized in that, It also includes the slag discharging system according to any one of claims 1-10.

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