Center rotary device, slag prevention and removal method, rotary slag conveying device and tunnel boring machine

Abstract

The present invention provides a central rotary device, a slag prevention and removal method, and a rotary slag conveying device. The slag prevention and removal method is to install a movable sleeve on a fixed conveying pipeline, and the movable sleeve forms a point pressure gap with the joint of the rotating component. Positive pressure gas is introduced into the sealed chamber of the rotary device to prevent slag from invading. When a large piece of slag invades and gets stuck, the movable sleeve is controlled to move, and the gap between the movable sleeve and the joint of the rotating component is increased to release the stuck state of the slag and blow it out. The slag prevention and removal method of the present invention prevents slag from invading by introducing positive pressure gas into the sealed chamber, and prevents the invading slag from getting stuck by adjusting the gap through the movable sleeve, thereby solving the problem that the central rotary device is damaged due to slag intrusion under pneumatic slag conveying conditions, thereby affecting construction. The central rotary device includes a rotary part, a fixed part, a rotary support part, and components and an air pressure pipeline for realizing the above-mentioned slag prevention and removal method; the rotary slag conveying device includes the above-mentioned central rotary device.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel excavation equipment, and in particular relates to a central rotary device, a slag prevention and removal method, and a rotary slag conveying device. Background Art

[0002] Shaft excavation can reach depths of hundreds of meters, creating extremely harsh working conditions. Conventional methods such as scrapers and mud-water circulation, when applied to shaft equipment, suffer from low efficiency and complex processes. Using negative pressure pneumatic conveying to remove slag offers advantages such as high efficiency and ease of installation, and has begun to be used in shaft projects and cantilevered roadheaders.

[0003] Pneumatic conveying systems typically feature a slag suction port or pipe at the tunnel excavation face. Under certain operating conditions, the port or pipe must rotate synchronously with the cutterhead, necessitating a central rotary device positioned between the port and the fixed discharge pipe. Chinese invention patent application publication number CN110541707A (publication date: December 6, 2019) discloses a novel vertical shaft slag discharge device. This device includes a slag suction port extending to the shaft bottom. When the excavation device is a rotating cutterhead, a rotary joint is positioned between the port and the fixed discharge pipe, allowing the port to rotate with the cutterhead. Due to the harsh operating conditions and the primary conveyed material being soil, soil is prone to intrusion between the mating surface of the rotary device and the suction pipe, causing wear, jamming, and even damage to the rotary device, seriously impacting project progress.

[0004] Therefore, it is necessary to develop a central rotating device that can prevent the intrusion of slag and remove the intruded slag under pneumatic conveying and slag removal conditions. Summary of the Invention

[0005] The present invention aims to provide a central rotary device and a slag prevention and removal method to address the prior art technical problem of slag easily invading the central rotary device during pneumatic conveying and removal, and the difficulty in removing the slag. The present invention also aims to provide a rotary slag conveying device to address the prior art technical problem of slag invading the central rotary device, causing damage to the device and thus affecting project efficiency.

[0006] To achieve the above-mentioned purpose, the technical solution of the slag prevention and removal method of the central rotary device provided by the present invention is:

[0007] A method for preventing and removing slag from a central rotary device is to install a movable sleeve on a fixed conveying pipeline. The movable sleeve and the rotating component joint form a point pressure gap fit. Positive pressure gas is introduced into the sealing chamber of the central rotary device to prevent slag from invading. When a large piece of slag invades and gets stuck, the movable sleeve is controlled to move, and the gap between the movable sleeve and the rotating component joint is increased to release the stuck slag and blow it out.

[0008] The beneficial effects are as follows: this technical solution has two functions by introducing positive pressure gas into the sealing cavity. First, it supports the seal to ensure the sealing effect of the seal. Second, it can prevent the invasion of debris and blow out the invaded debris to achieve the effect of preventing and removing slag. When a large piece of debris invades and gets stuck in the gap, the movable sleeve is controlled to move, the gap is increased, the stuck state of the debris is released, and it is easy to be blown out by the gas. This technical solution meets the use requirements of the central rotary device for preventing and removing slag, avoids the occurrence of equipment damage and shutdown caused by debris intrusion and jamming during operation, extends the service life, and improves construction efficiency.

[0009] As a further improvement, a sensor is placed in the gap, and the presence of soil intrusion is determined based on the sensor detection signal, and the movement of the movable sleeve is controlled to adjust the gap size.

[0010] The beneficial effect is that the sensor signal can be used to timely determine whether there is slag intrusion, and slag removal adjustments can be made in time, further reducing the possibility of slag wearing the central rotary device.

[0011] To achieve the above-mentioned purpose, the technical solution of the center rotation device provided by the present invention is:

[0012] The central rotating device includes a fixed part, a rotating part and a rotating support part. The fixed part is used to connect the conveying pipeline, the rotating part is used to connect the rotary joint, and the rotating support part provides support for the rotating part. A sealing part is provided between the fixed part and the rotating part. An axially movable sleeve is provided in the fixed part. The movable sleeve is provided with a hole for allowing the conveying pipeline to pass through. The movable sleeve and the rotating part form a point pressure gap fit. The cavity for installing the sealing part is connected to the air intake pipe.

[0013] The beneficial effect is that air is ventilated into the sealing cavity through the air inlet pipe, the debris can be blown out, which plays a role in preventing the debris from entering, and can also play a role in supporting the seal. When a large piece of debris invades and gets stuck, the movable sleeve is adjusted to increase the gap, the stuck state of the debris is released, and the debris is blown out from the gap. The central rotary device can realize the function of preventing and removing slag, avoids the wear of the central rotary device caused by the invasion of debris, extends the service life of the central rotary device, and thus improves the construction efficiency.

[0014] As a further improvement, the central rotating device further includes a blowing pipe, and the fitting gap between the movable sleeve and the rotating member is provided with an air outlet for the blowing pipe.

[0015] The beneficial effect is that when the intruded debris is large and difficult to blow out, an instantaneous high-pressure jet airflow can be added to the gap through the jet pipe to blow the debris out, thereby improving the efficiency of debris removal.

[0016] As a further improvement, the movable sleeve is a concave ring with a middle diameter smaller than the diameters at both ends. The concave ring is provided with a blowing pipe air outlet at one end close to the seal, and the other end is closed and connected to a driving structure.

[0017] The beneficial effect is that the concave ring structure is convenient for connecting the blowing pipe in the middle, and an air passage is provided at the lower end, so that the blowing airflow is reflected from bottom to top when it contacts the seal or rotating part, making it easy to blow out the debris.

[0018] As a further improvement, the air outlet of the blowing pipe faces the sealing member.

[0019] The beneficial effect is that the sealing member is generally a leather cup type sealing member, and the air flow sprayed toward the sealing member can also achieve the effect of expanding the sealing member, thereby enhancing the sealing effect.

[0020] As a further improvement, a sealed drive cavity is provided at one closed end of the concave ring, the drive structure includes the sealed drive cavity, and the sealed drive cavity is connected to a pressure replenishing pipe and a pressure relief pipe.

[0021] The beneficial effect is that the movable sleeve forms a piston-type structure, which can be adjusted steplessly and is easy to implement through pressure control.

[0022] As a further improvement, a sensor is provided in the fitting clearance between the movable sleeve, the fixed part and the rotating part.

[0023] The beneficial effect is that the sensor signal can be used to timely determine whether there is slag intrusion, and slag removal adjustments can be made in time, further reducing the possibility of slag wearing the central rotary device.

[0024] As a further improvement, the central rotating device also includes a control unit, which can identify sensor signals and is connected to the control valves of the air intake pipe, the injection pipe, the pressure replenishing pipe, and the pressure relief pipe.

[0025] The beneficial effect is that the control unit automatically controls the opening and closing of each valve according to the sensor signal, realizes the automation of slag prevention and removal, and improves the efficiency of slag prevention and removal.

[0026] To achieve the above-mentioned purpose, the technical solution of the rotary slag conveying device provided by the present invention is:

[0027] The rotary slag conveying device includes a conveying pipe, a rotary joint and a central rotary device connecting the conveying pipe and the rotary joint. The central rotary device includes a fixed part, a rotating part and a rotary support part. The fixed part is used to connect the conveying pipe, the rotating part is used to connect the rotary joint, and the rotary support part provides support for the rotating part. A sealing part is provided between the fixed part and the rotating part. An axially movable sleeve is provided in the fixed part. The movable sleeve is provided with a hole for allowing the conveying pipe to pass through. The movable sleeve and the rotating part form a point pressure clearance fit. The cavity for installing the sealing part is connected to the air intake pipe.

[0028] The beneficial effect is that air is ventilated into the sealing cavity through the air inlet pipe, the debris can be blown out, which plays a role in preventing the debris from entering, and can also play a role in supporting the seal. When a large piece of debris invades and gets stuck, the movable sleeve is adjusted to increase the gap, the stuck state of the debris is released, and the debris is blown out from the gap. The central rotary device can realize the function of preventing and removing slag, avoids the wear of the central rotary device caused by the invasion of debris, extends the service life of the central rotary device, and thus improves the construction efficiency.

[0029] As a further improvement, the central rotating device further includes a blowing pipe, and the fitting gap between the movable sleeve and the rotating member is provided with an air outlet for the blowing pipe.

[0030] The beneficial effect is that when the intruded debris is large and difficult to blow out, an instantaneous high-pressure jet airflow can be added to the gap through the jet pipe to blow the debris out, thereby improving the efficiency of debris removal.

[0031] As a further improvement, the movable sleeve is a concave ring with a middle diameter smaller than the diameters at both ends. The concave ring is provided with a blowing pipe air outlet at one end close to the seal, and the other end is closed and connected to a driving structure.

[0032] The beneficial effect is that the concave ring structure is convenient for connecting the blowing pipe in the middle, and an air passage is provided at the lower end, so that the blowing airflow is reflected from bottom to top when it contacts the seal or rotating part, making it easy to blow out the debris.

[0033] As a further improvement, the air outlet of the blowing pipe faces the sealing member.

[0034] The beneficial effect is that the sealing member is generally a leather cup type sealing member, and the air flow sprayed toward the sealing member can also achieve the effect of expanding the sealing member, thereby enhancing the sealing effect.

[0035] As a further improvement, a sealed drive cavity is provided at one closed end of the concave ring, the drive structure includes the sealed drive cavity, and the sealed drive cavity is connected to a pressure replenishing pipe and a pressure relief pipe.

[0036] The beneficial effect is that the movable sleeve forms a piston-type structure, which can be adjusted steplessly and is easy to implement through pressure control.

[0037] As a further improvement, a sensor is provided in the fitting clearance between the movable sleeve, the fixed part and the rotating part.

[0038] The beneficial effect is that the sensor signal can be used to promptly detect whether there is slag intrusion, and slag removal adjustments can be made in a timely manner, further reducing the possibility of slag wearing the central rotary device.

[0039] As a further improvement, the central rotating device also includes a control unit, which can identify sensor signals and is connected to the control valves of the air intake pipe, the injection pipe, the pressure replenishing pipe, and the pressure relief pipe.

[0040] The beneficial effect is that the control unit automatically controls the opening and closing of each valve according to the sensor signal, realizes the automation of slag prevention and removal, and improves the efficiency of slag prevention and removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a structural diagram of Example 1 of the rotary slag conveying device in the present invention.

[0042] Description of reference numerals:

[0043] 1. Rotary joint; 2. Rotating part; 3. Rotating support part; 4. Sealing part; 5. Fixed part; 6. Movable sleeve; 7. Telescopic part; 8-1. Pressure compensation valve; 8-2. Pressure relief valve; 9. Delivery pipeline; 10. Sensor; 11. Air compensation valve; 12. Air intake valve; 13. Pressure setting unit; 14. Control unit; 15. Air pressure regulating unit. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0046] It should be noted that relational terms such as "first" and "second" that may appear are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, elements defined by the phrase "including a..." do not exclude processes or methods that include the elements.

[0047] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "provided with" and "provided with" should be understood in a broad sense. For example, the object "provided with" may be a part of the main body, or may be arranged separately from the main body and connected to the main body. The connection may be detachable or non-detachable. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] The present invention is described in further detail below with reference to the examples.

[0050] Specific embodiment 1 of the rotary slag conveying device provided by the present invention:

[0051] The rotary slag conveying device provided in this embodiment is as follows Figure 1As shown, it includes a conveying pipe 9, a rotary joint 1 and a central rotary device. The conveying pipe 9 is connected to a negative pressure generator, and the negative pressure is used to transport the excavated soil outward. The rotary joint 1 rotates synchronously with the excavation cutter head of the tunnel boring machine. The negative pressure generator and the excavation cutter head are existing technologies and will not be described here in detail. The central rotary device includes a fixed part 5, a rotating part 2, a rotary support part 3, a movable sleeve 6 and various pipe assemblies. The rotating part 2 is connected to the rotary joint 1, and the movable sleeve 6 is arranged in the fixed part 5. The conveying pipe 9 passes through the center hole of the movable sleeve 6. At the mating position of the rotary joint 1 and the conveying pipe 9, due to the relative rotation of the two, under certain working conditions, soil will be scattered outward from the mating surface. The rotary support member 3 is arranged between the fixed member 5 and the rotating member 2. The rotating member 2 can rotate with the rotary support member 3. The axial length of the rotary support member 3 is smaller than that of the fixed member 5 and the rotating member 2. A sealing member 4 is provided in the space between the rotary support member 3, the rotating member 2 and the fixed member 5 to form a sealed cavity. The sealed cavity is connected to an air intake pipe. The air intake pipe introduces positive pressure gas into the sealed cavity. On the one hand, it plays a role in supporting the sealing member 4. On the other hand, it can prevent the invasion of debris. The air intake valve 12 controls the opening and closing of the air intake pipe.

[0052] The movable sleeve 6 is movable up and down. To ensure that the rotating member 2 can rotate normally, a certain gap is left between the lower limit position of the movable sleeve 6 and the end of the rotating member 2. The movable sleeve 6 is a concave ring with a smaller diameter in the middle than at the two ends. A spray pipe is connected to the central recess, and the air supply valve 11 controls the opening and closing of the spray pipe. The lower end of the movable sleeve 6 is provided with an air port for the spray pipe. The air port faces the seal 4. The air flow from the spray pipe is ejected from the air port, which can blow larger pieces of debris into the conveying pipe. The seal 4 is a leather cup seal. The air flow in the spray channel has the effect of expanding the seal 4, which can further improve the sealing effect of the seal 4.

[0053] Thin-walled rings are provided on both the inside and outside of the movable sleeve 6 (not shown in the figure due to the thin wall thickness). The upper end of the movable sleeve 6, the thin-walled rings on both sides, and the upper end cap form a sealed drive cavity, and are connected to a telescopic member 7. The sealed drive cavity is connected to a pressure-compensating pipeline and a pressure-relieving pipeline. The pressure-compensating valve 8-1 controls the opening and closing of the pressure-compensating pipeline, and the pressure-relieving valve 8-2 controls the opening and closing of the pressure-relieving pipeline. When the pressure-compensating valve 8-1 is open and the pressure-relieving valve 8-2 is closed, the movable sleeve 6 moves downward, and the gap decreases. When the pressure-compensating valve 8-1 is closed and the pressure-relieving valve 8-2 is open, the movable sleeve 6 moves upward, and the gap increases. The telescopic member 7 exerts a pulling force on the movable sleeve 6, sliding and retracting up and down with the movable sleeve 6, limiting the lower travel limit of the movable sleeve 6.

[0054] A sensor 10 is provided in the gap between the movable sleeve 6 and the rotating part 2. The sensor 10 may be a pressure sensor. When a large piece of debris invades the gap, it will cause a pressure change in the gap. The sensor 10 detects a change in the pressure signal value, and at this time, it can accurately determine whether there is debris intrusion.

[0055] This embodiment also includes a control unit 14, which is connected to the air intake pipe, the injection pipe, the pressure compensation pipe, the pressure relief pipe, and the sensor 10. It is also connected to a pressure setting unit 13. The control unit 14 can automatically identify and control the opening and closing of various valves based on the detection signal value of the sensor 10. The pressure setting unit 13 is used to set the normal range of the air pressure value detected by the sensor 10.

[0056] An air pressure regulating unit 15 is provided between the air supply valve 11 and the control unit 14. The air pressure regulating unit 15 can control the air pressure in the injection pipe. When in use, the size of the intruding slag is determined according to the variation range of the sensor 10 signal, and the air pressure in the injection pipe is adjusted to achieve a precise slag removal effect.

[0057] The working principle of this embodiment:

[0058] Keep the air inlet valve 12 open, and the air inlet channel continuously inflates the sealed cavity to prevent debris from entering. At this time, the pressure value detected by the sensor 10 is in a stable state. When debris invades and gets stuck, the signal of the sensor 10 fluctuates abnormally, exceeding the normal range set by the pressure setting unit 13. The control unit 14 receives the signal, opens the pressure relief valve 8-2, and the movable sleeve 6 rises, increasing the gap and releasing the stuck state of the debris. In order to improve the efficiency of slag removal, the control unit 14 opens the air supply valve 11 at the same time, and controls the air pressure regulating unit 15 according to the size of the signal fluctuation. The injection pipe replenishes instantaneous high-pressure gas into the gap, blowing the debris away from the gap between the movable sleeve 6 and the rotating part 2, and transports it outward through the conveying pipe 9 to complete the slag removal.

[0059] This embodiment can realize the functions of slag prevention and removal. Under the condition of pneumatic slag conveying, it can effectively prevent the center rotary device from being stuck and damaged due to the intrusion of slag or even causing equipment shutdown, thereby extending the service life and improving construction efficiency.

[0060] The second embodiment of the rotary slag conveying device provided by the present invention differs from the first embodiment primarily in that, in the first embodiment, the central rotary device includes a blowing pipe and an air supply valve 11. In this embodiment, the blowing pipe and air supply valve are not provided. When the movable sleeve rises to release the stuck slag, the slag is blown out by increasing the air pressure in the air supply pipe.

[0061] Specific embodiment 3 of the rotary slag conveying device provided by the present invention differs from embodiment 1 primarily in that, in embodiment 1, thin-walled rings are provided on both the inner and outer sides of the movable sleeve 6 to provide a seal. In this embodiment, rubber seals are provided on both the inner and outer sides of the movable sleeve. The movable sleeve, fixed member, conveying pipe, and upper end cover form a sealed drive cavity. Removed slag is now sucked outward through the conveying pipe from the mating position of the rotary joint.

[0062] Specific embodiment 4 of the rotary slag conveying device provided by the present invention differs from embodiment 1 primarily in that, while embodiment 1 includes a sensor 10 for detecting pressure to determine whether slag intrusion is present, this embodiment does not include a sensor within the air supply chamber, and the opening and closing of the air supply channel is determined based on experience and the state of the rotating member.

[0063] Specific embodiment 5 of the rotary slag conveying device provided by the present invention differs from embodiment 1 primarily in that, in embodiment 1, the sensor 10 is a pressure sensor. In this embodiment, the sensor can be a vibration sensor, a temperature sensor, or an air flow sensor. When slag intrusion and jamming occur, friction will cause vibration, heat, air flow changes, and other changes, which can also be identified using the corresponding type of sensor.

[0064] The sixth embodiment of the rotary slag conveying device provided by the present invention differs from the first embodiment primarily in that, in the first embodiment, the upward and downward extension and retraction of the movable sleeve 6 is driven by air pressure. In this embodiment, no pressure-compensating and pressure-relieving pipes are included, and the telescopic member is a rigid electric telescopic rod, which allows for upward and downward adjustment of the movable sleeve.

[0065] The specific embodiment 7 of the rotary slag conveying device provided by the present invention differs from the embodiment 1 mainly in that: in the embodiment 1, the blowing pipe is connected to the air pressure regulating unit 15. In this embodiment, the blowing pipe is not connected to the air pressure regulating unit, and the blowing pipe can output stable high-pressure gas.

[0066] Specific embodiment 8 of the rotary slag conveying device provided by the present invention differs from embodiment 1 primarily in that, in embodiment 1, thin-walled rings are provided on both the inner and outer sides of the movable sleeve 6 to provide a seal. In this embodiment, the movable sleeve is a hollow sealing ring with an independent sealing cavity above it. A clearance fit is provided between the movable sleeve and the fixed member. This allows for auxiliary discharge of slag through the gap between the movable sleeve and the fixed member, improving slag removal efficiency.

[0067] Specific embodiment of the center rotating device in the present invention:

[0068] The embodiment of the central rotating device is the central rotating device described in any one of the embodiments 1 to 8 of the rotary slag conveying device, and will not be described in detail here.

[0069] Specific embodiment of the slag prevention and removal method of the central rotary device in the present invention:

[0070] The method for preventing and removing slag from a central rotary device involves installing a movable sleeve on a fixed conveying pipe. The movable sleeve forms a point pressure clearance fit with the joint of the rotating assembly. Positive pressure gas is introduced into the sealing chamber of the rotary device to prevent slag from entering the seal. When a large piece of slag invades and gets stuck, the movable sleeve is controlled to move, increasing the clearance between the movable sleeve and the joint of the rotating assembly to release the stuck slag and blow it out. The method for preventing and removing slag can be implemented using the central rotary device described in any of the embodiments 1-8 of the rotary slag conveying device. Here, taking embodiment 1 as an example, the method specifically includes the following steps:

[0071] S1: Slag removal pretreatment: Keep the air inlet valve 12 open, and continuously introduce positive pressure gas into the sealed chamber through the air inlet channel to remove the residual slag. Adjust the movable sleeve 6 to rise to release any large pieces of slag that may be stuck. At the same time, open the air supply valve 11, and use the spray pipe to add high-pressure gas into the gap to blow the large pieces of slag out of the gap and discharge them outward through the conveying pipe 9. Adjust the movable sleeve 6 to descend to a certain position, and close the air supply valve 11. When there is no abnormal signal fluctuation from the sensor 10 within the set time, the pretreatment is considered completed.

[0072] S2: Enter the pneumatic slag removal working condition, keep the air inlet valve 12 open, and continue to introduce positive pressure gas into the sealed cavity through the air inlet channel to prevent the invasion of slag. Assuming that the normal signal range of sensor 10 is AB, when the detection signal of sensor 10 is greater than B, it is considered that a large piece of slag has invaded, and the movable sleeve 6 is adjusted to rise to release the stuck state of the large piece of slag. At the same time, open the air supply valve 11, and the air supply channel fills the air supply cavity with high-pressure gas to remove the invading slag. After completion, adjust the movable sleeve 6 to descend to the initial position and close the air supply valve 11. When the detection signal of sensor 10 returns to AB, the slag removal is considered to be completed. At this time, the air inlet valve 12 is opened to maintain the anti-slag effect;

[0073] S3: Post-slag cleaning: After pneumatic slag conveying is complete, first turn off the negative pressure generator to stop pneumatic conveying. Then, keep the air inlet valve 12 open, and continuously introduce positive pressure gas into the sealed chamber through the air inlet channel to prevent residual slag. Adjust the movable sleeve 6 upward and open the air supply valve 11 to ensure that no slag is left. After completing the post-processing, close all units and valves and shut down the machine.

[0074] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preventing and removing slag from a central rotary device, characterized in that: The method comprises the following steps: ① introducing positive pressure gas into the sealing chamber of the central rotary device and discharging the positive pressure gas into the conveying pipe through the axial gap between the movable sleeve and the joint of the rotating component to prevent the intrusion of debris, wherein the movable sleeve is outside the conveying pipe and can move up and down, and a gap is left between the movable sleeve and the end of the rotating member at the lower limit of the travel, which constitutes the axial gap; ② When a large piece of debris invades and gets stuck, control the movable sleeve to move, increase the gap between the movable sleeve and the rotating assembly joint, release the stuck state of the debris, and blow the debris out.

2. The method for preventing and removing slag from a central rotary device according to claim 1, characterized in that: A sensor is placed in the gap, and the presence of soil intrusion is determined based on the sensor detection signal, and the movement of the movable sleeve is controlled to adjust the gap size.

3. A central rotary device, comprising a fixed member (5), a rotating member (2) and a rotary support member (3), wherein the fixed member (5) is used to connect to a conveying pipe (9), the rotating member (2) is used to connect to a rotary joint (1), the rotary support member (3) provides support for the rotating member (2), and a sealing member (4) is provided between the fixed member (5) and the rotating member (2), characterized in that: An axially movable sleeve (6) is provided in the fixing member (5), and the movable sleeve (6) is provided with a hole through which the delivery pipe (9) can pass. The movable sleeve (6) and the rotating member (2) form a point pressure clearance fit, and the cavity for installing the sealing member (4) is connected to the air intake pipe.

4. The center rotation device according to claim 3, characterized in that: It also includes a blowing pipeline, and the matching gap between the movable sleeve (6) and the rotating member (2) is provided with an air outlet for the blowing pipeline.

5. The center rotation device according to claim 4, characterized in that: The movable sleeve (6) is a concave ring with a middle diameter smaller than the diameters at both ends. The concave ring is provided with a blowing pipe air outlet at one end close to the sealing member (4), and the other end is closed and connected to a driving structure.

6. The center rotation device according to claim 5, characterized in that: The air outlet of the blowing pipe faces the sealing member (4).

7. The center rotation device according to claim 6, characterized in that: A sealed driving cavity is provided at one closed end of the concave ring, and the driving structure includes the sealed driving cavity. The sealed driving cavity is connected to a pressure replenishing pipe and a pressure relief pipe.

8. The center rotation device according to claim 7, characterized in that: A sensor is provided in the fitting gap between the movable sleeve (6), the fixed part (5) and the rotating part (2).

9. The center rotation device according to claim 8, characterized in that: It also includes a control unit (14), which can identify sensor signals and is connected to control valves of the air intake pipe, the injection pipe, the pressure replenishment pipe, and the pressure relief pipe.

10. A rotary slag conveying device comprising a conveying pipe (9), a rotary joint (1) and a central rotary device connecting the conveying pipe (9) and the rotary joint (1), characterized in that: The central rotating device is the central rotating device described in any one of claims 3 to 9.

11. A roadheader equipped with a slag conveying device for discharging slag from bottom to top, characterized in that: The slag conveying device is the rotary slag conveying device according to claim 10.

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