A kind of supporting roller with water vapor combination active sealing device and mining belt conveyor

Abstract

The present application belongs to the technical field of sealing of a belt conveyor roller, and particularly relates to a roller with a water-gas combined active sealing device, which comprises a roller assembly and a water-gas combined active sealing device, wherein the roller assembly comprises a roller shaft, a roller barrel and a bearing seat, a bearing is arranged between the bearing seat and the roller shaft, and the bearing is provided with the water-gas combined active sealing device on one side; the water-gas combined active sealing device comprises a water-gas combined sealing device, a water self-sealing structure and a gas self-sealing structure; the water self-sealing structure is used to actively convert multiple media under multiple working conditions into water, and the gas self-sealing structure is used to discharge the leaked water together with gas, so as to realize reliable sealing of the roller; the present application also provides a mine belt conveyor which is equipped with the roller with the water-gas combined active sealing device, so that the roller can ensure normal operation under multiple complex working conditions such as high dust, high humidity and roller immersion, and ensure long-time safe and reliable operation of the belt conveyor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sealing of a carrier roller for a belt conveyor, and particularly relates to a carrier roller with a water-gas combined active sealing device and a mine belt conveyor. BACKGROUND

[0002] The belt conveyor is widely used in coal mines, power plants, ports and metallurgical industries due to its continuous and efficient transportation capacity. The carrier roller, as a key supporting component, directly affects the system operation efficiency and stability. Among them, the mine belt conveyor, as the core equipment for coal mining and transportation, has been running in extreme working conditions such as high dust, high humidity and even water immersion for a long time, which puts higher requirements on the sealing performance of the carrier roller bearing.

[0003] Most of the existing carrier rollers use labyrinth seals. Although they can achieve good sealing effect in most cases, once the carrier roller enters the water accumulation working condition, external water can easily enter the carrier roller bearing through the labyrinth seal, causing lubrication failure of the carrier roller bearing, and further causing the carrier roller to be scrapped. If the damaged carrier roller cannot be replaced in time, it may cause the belt to break or even the belt conveyor to completely stop, which causes high maintenance cost and great safety hazard to the safe and stable operation of the belt conveyor.

[0004] Therefore, it is urgent to develop a new sealing scheme for the carrier roller of the mine belt conveyor, so that the mine belt conveyor can run safely and reliably for a long time under complex conditions in the mine. SUMMARY

[0005] In view of this, the present application aims to provide a carrier roller with a water-gas combined active sealing device. Under the premise of building a water-gas composite sealing device, the water self-sealing structure is used to fill the entire positive pressure water cavity with water, actively converting multiple media such as dust, high humidity gas and water into unified water medium for sealing. Then, the gas self-sealing structure is used to discharge the water and gas leaked into the safety leakage gas cavity together, so as to realize reliable sealing of the carrier roller.

[0006] At the same time, the present application also provides a mine belt conveyor equipped with a carrier roller with a water-gas combined active sealing device, so that the belt conveyor can run safely and reliably for a long time under complex conditions in the mine.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0008] A carrier roller with a water-gas combined active sealing device, comprising:

[0009] The roller assembly comprises a roller shaft, an outer sleeve of the roller shaft is provided with a roller barrel, a bearing seat is arranged between the roller shaft and the roller barrel, a group of bearings are arranged between the bearing seat and the roller shaft, an outer side of each bearing is provided with a water-gas combined active sealing device, the water-gas combined active sealing device is communicated with the external environment, and is used for sealing and isolating multiple media in the external environment.

[0010] The water-gas combined active sealing device comprises a water-gas combined sealing device and a water self-sealing structure and a gas self-sealing structure which are arranged in cooperation with the water-gas combined sealing device.

[0011] The water-gas combined sealing device comprises a dynamic sealing assembly and a static sealing assembly which are arranged in cooperation.

[0012] The dynamic sealing assembly comprises a dynamic ring seat which is in a whole step shape, the dynamic ring seat is composed of a connecting part and a first sealing part which are integrally formed, the connecting part is connected with the bearing seat through a locking bolt, at this time, an annular space is formed between the first sealing part and the bearing seat, and a dynamic ring is arranged in the annular space in cooperation, the dynamic ring seat and the dynamic ring rotate with the roller barrel, on this basis, a radial sealing gap is formed between the first sealing part and the roller shaft, and the first sealing part is provided with a spiral groove on a circumferential inner wall close to the roller shaft, a center line of the spiral groove coincides with an axis of the roller shaft.

[0013] The static sealing assembly comprises a static ring seat which is in an L-shaped radial section, and the static ring seat is composed of a second sealing part and a folded part which are integrally formed, a circumferential outer surface of the second sealing part is provided with a spacing channel which is communicated with the external environment, an end of the folded part is attached to a circumferential outer surface of the roller shaft, in addition, an end of the second sealing part is provided with a static ring, and an end of the static ring is attached to an end of the dynamic ring.

[0014] Preferably, the static sealing assembly further comprises a spring pre-tightening mechanism arranged between the static ring seat and the carrier roller shaft, the spring pre-tightening mechanism comprises a spring seat sleeved on the carrier roller shaft, the spring seat is provided with spring seat clamping springs on both axial sides, and the spring seat is fixed on the carrier roller shaft through the spring seat clamping springs; in addition, on one side of the spring seat, there is a spacing area between the spring seat and the static ring seat, which is configured as a pre-tightening area; on the other side of the spring seat, a safety leakage air cavity is formed among the spring seat, the dynamic sealing assembly, the static ring and the carrier roller shaft; on this basis, a plurality of locking bolts and a plurality of passage holes are uniformly arranged on the spring seat in the circumferential direction of the spring seat; the end of the locking bolt is stretched out from the other side of the folded part after sequentially penetrating the spring seat, the pre-tightening area and the folded part; the spring is sleeved on the outer wall of the locking bolt, and the spring is located in the pre-tightening area; the end of the locking bolt is further matched with a pressing nut; by rotating the pressing nut, the static ring seat is moved towards the dynamic ring seat, so that the static ring and the dynamic ring are pre-tightened and fitted to form a fitted sealing part; when the multi-element medium in the external environment runs to the fitted sealing part through the spacing passage, it is intercepted and sealed;

[0015] The water self-sealing structure comprises a gland in a whole annular structure, the gland is located outside the static ring seat, and the gland is connected with the static ring seat through a locking bolt; in addition, the gland is provided with an annular boss on the circumferential outer wall thereof, and a gap exists between the annular boss and the bearing seat; on this basis, the region formed by the annular boss, the gland and the spacing passage is configured as a positive pressure water cavity; the positive pressure water cavity is supplied with positive pressure water through a water supply assembly, and after the positive pressure water fills the whole positive pressure water cavity, the water gas combination active sealing device is discharged from the gap between the annular boss and the bearing seat; at the same time, the positive pressure water also flows to the safety leakage air cavity from the fitted sealing part, and the flow to the safety leakage air cavity is configured as internal leakage water.

[0016] The gas self-sealing structure comprises a cavity formed between the connecting part and the carrier roller shaft, and the cavity is configured as a positive pressure gas cavity; the positive pressure gas cavity is supplied with positive pressure gas through a gas supply assembly; on the basis that the positive pressure gas fills the whole positive pressure gas cavity, the gas flows to the safety leakage air cavity from the radial sealing gap, carries the water in the safety leakage air cavity, enters the pre-tightening area through the passage hole, and is finally discharged from the water gas discharge assembly.

[0017] Preferably, in the carrier roller assembly, the bearing is provided with a bearing washer on the side away from the water gas combination active sealing device, and the bearing is provided with a bearing clamping spring on the side close to the water gas combination active sealing device; the bearing clamping spring is fixedly connected with the carrier roller shaft.

[0018] The dynamic ring and the dynamic ring seat are connected through a first anti-rotation pin, and the static ring and the static ring seat are connected through a second anti-rotation pin.

[0019] Further, in the water self-sealing structure, the water supply assembly comprises first water supply pipelines arranged on the gland, and four first water supply pipelines are evenly arranged along the radial direction of the gland, wherein each first water supply pipeline comprises a first port and a second port, the first port is located on the outer circumferential surface of the gland and communicates with the positive pressure water cavity, and the water supply assembly further comprises a first annular groove arranged on the inner circumferential wall of the gland, the radial section of the first annular groove is rectangular, and the second port of each first water supply pipeline communicates with the first annular groove;

[0020] In addition, the water supply assembly further comprises a second water supply pipeline, a second annular groove arranged on the outer circumferential surface of the carrier roller shaft, and a water supply external pipeline, wherein the second water supply pipeline is arranged in the interior of the carrier roller shaft, the second water supply pipeline comprises a water inlet port and a water outlet port, the water outlet port is located in the second annular groove, the radial section of the second annular groove is also rectangular, the position of the second annular groove corresponds to the position of the first annular groove, the axial width of the second annular groove is smaller than the axial width of the first annular groove, and the second annular groove is always within the axial width of the first annular groove during the whole process of moving the gland, the static ring seat and the static ring to the side close to the dynamic ring through the compression nut, the water inlet port is located on the end face of the carrier roller shaft and is connected with the water supply external pipeline, and the other end of the water supply external pipeline is connected with a water source.

[0021] In addition, the water supply assembly further comprises a second water supply pipeline, a second annular groove arranged on the outer circumferential surface of the carrier roller shaft, and a water supply external pipeline, wherein the second water supply pipeline is arranged in the interior of the carrier roller shaft, the second water supply pipeline comprises a water inlet port and a water outlet port, the water outlet port is located in the second annular groove, the radial section of the second annular groove is also rectangular, the position of the second annular groove corresponds to the position of the first annular groove, the axial width of the second annular groove is smaller than the axial width of the first annular groove, and the second annular groove is always within the axial width of the first annular groove during the whole process of moving the gland, the static ring seat and the static ring to the side close to the dynamic ring through the compression nut, the water inlet port is located on the end face of the carrier roller shaft and is connected with the water supply external pipeline, and the other end of the water supply external pipeline is connected with a water source.

[0022] Preferably, in the air self-sealing structure, the air supply assembly comprises an air supply pipeline arranged in the interior of the carrier roller shaft, one port of the air supply pipeline is located on the outer circumferential surface of the carrier roller shaft and communicates with the positive pressure air cavity, and the other port of the air supply pipeline is located on the end face of the carrier roller shaft and is connected with an air supply external pipeline, and the other end of the air supply external pipeline is connected with an air source.

[0023] The water and air discharge assembly comprises a water and air mixed discharge pipeline arranged in the interior of the carrier roller shaft and an internal leakage water collection groove arranged on the carrier roller shaft, wherein the internal leakage water collection groove is arranged along the circumferential direction of the carrier roller shaft and is located in the pre-tightening area, and one port of the water and air mixed discharge pipeline communicates with the internal leakage water collection groove, and the other port of the water and air mixed discharge pipeline is connected with a water and air mixed discharge external pipeline, and an overflow valve is further connected to the water and air mixed discharge external pipeline.

[0024] Preferably, the port of the water and air mixed discharge pipeline, which communicates with the internal leakage water collection groove, is located directly below the axis of the carrier roller shaft.

[0025] Preferably, in the water-gas combined active sealing device, the connecting part of the movable ring seat is provided with a first sealing groove on the circumferential surface abutting the bearing seat, and a first sealing ring is arranged in the first sealing groove.

[0026] The first sealing part of the movable ring seat is provided with a second sealing groove on the circumferential surface abutting the movable ring, and a second sealing ring is arranged in the second sealing groove.

[0027] The folded part of the stationary ring seat is provided with a third sealing groove on the circumferential surface abutting the carrier roller shaft, and a third sealing ring is arranged in the third sealing groove.

[0028] The second sealing part of the stationary ring seat is provided with a fourth sealing groove on the end surface abutting the stationary ring, and a fourth sealing ring is arranged in the fourth sealing groove.

[0029] The spring seat is provided with a fifth sealing groove on the circumferential surface abutting the second sealing part, and a fifth sealing ring is arranged in the fifth sealing groove.

[0030] The gland is provided with two sixth sealing grooves on the circumferential surface abutting the carrier roller shaft, and the two sixth sealing grooves are respectively located on the two sides of the first water supply pipeline, and a sixth sealing ring is arranged in each sixth sealing groove.

[0031] In addition, the present application also provides a mine belt conveyor comprising the above-mentioned carrier roller with a water-gas combined active sealing device.

[0032] The belt conveyor body comprises a driving roller and a driven roller respectively arranged at the two ends of the belt conveyor body, the driving roller is connected with a power assembly, and the driving roller is provided with rotating power through the power assembly, and in addition, the driving roller and the driven roller are jointly and rotatably connected with a conveying belt.

[0033] A plurality of carrier roller modules are evenly arranged on the belt conveyor body through support frames, and the plurality of carrier roller modules are located between the driving roller and the driven roller, wherein each carrier roller module comprises three groups of the carrier roller assemblies located above the support frame and one group of the carrier roller assemblies located below the support frame, and the three groups of carrier roller assemblies form a "U"-shaped carrier roller groove above the support frame, and the carrier roller groove is used for supporting the conveying belt.

[0034] Preferably, each of the carrier roller modules comprises a gas supply valve block, a water supply valve block, an overflow valve block and a water return valve block, wherein:

[0035] Among the four groups of carrier roller assemblies in the carrier roller module, there are eight gas supply external pipelines, and the gas supply valve block is connected with the eight gas supply external pipelines.

[0036] In the four groups of roller assembly in the roller module, there are eight water supply external pipelines, and the water supply valve block is connected with the eight water supply external pipelines;

[0037] In the four groups of roller assembly in the roller module, there are eight water-gas mixed discharge external pipelines, and the overflow valve block is connected with the eight water-gas mixed discharge external pipelines;

[0038] In the four groups of roller assembly in the roller module, there are eight water-gas mixed discharge external pipelines, and the overflow valve block is connected with the eight water-gas mixed discharge external pipelines;

[0039] Further, the belt conveyor further comprises an air pump, a water pump, a water-gas collection tank and a water supply tank, wherein:

[0040] The air pump is connected with the air supply valve block in each roller module through the air supply pipeline and a plurality of air supply pipeline three-way valves, for simultaneously supplying air to a plurality of air supply valve blocks, and then supplying air to each roller assembly in each roller module;

[0041] The water pump is connected with the water supply tank, and the water pump is connected with the water supply valve block in each roller module through the water supply pipeline and a plurality of water supply pipeline three-way valves, for simultaneously supplying water to a plurality of water supply valve blocks, and then supplying water to each roller assembly in each roller module;

[0042] The water-gas collection tank is connected with the overflow valve block in each roller module through the water-gas pipeline and a plurality of water-gas pipeline three-way valves, for simultaneously receiving the water and gas output by a plurality of overflow valve blocks, and then simultaneously receiving the water and gas discharged by each roller assembly in each roller module;

[0043] The water supply tank is connected with the water return valve block in each roller module through the water return pipeline and a plurality of water return pipeline three-way valves, and a filter system is arranged on the water return pipeline, and the water in the water collection device in each roller module is returned to the water supply tank after passing through the filter system for recycling;

[0044] On this basis, the water-gas collection tank and the water supply tank are also connected through a connecting pipeline, and a filter system is also arranged on the connecting pipeline, and the water and gas in the water-gas collection tank are also gathered in the water supply tank after being discharged and filtered.

[0045] The beneficial effects of the present application are:

[0046] The application sets a water-gas combined active sealing device on the bearing side of the roller assembly, on the basis of taking the adhering sealing part formed by the dynamic ring and the static ring as the only leakage passage of the water-gas combined sealing device, the water self-sealing structure fills the gap cavity formed among the annular boss, the gland, the static ring seat and the bearing seat with water to form a positive pressure water cavity, and adopts the positive pressure water to actively block and intercept the multi-element medium such as dust, high humidity gas and accumulated water in the external environment, which is equivalent to replacing all the multi-element medium such as dust and high humidity gas with water, that is, the water-gas combined active sealing device only needs to consider the sealing of water, and on this basis, the air self-sealing structure supplies the positive pressure gas to the positive pressure gas cavity inside the water-gas combined active sealing device, on one hand, the positive pressure gas cooperates with the dynamic pressure gas film generated by the dynamic ring and the static ring to form a positive pressure sealing in the adhering sealing part, and plays a sealing effect on the positive pressure water, and on the other hand, the positive pressure gas brings the water possibly leaked from the adhering sealing part into the pre-tightening area under the coordination of the air pressure and the fluid pumping effect provided by the spiral groove, and the water and the gas in the pre-tightening area are discharged by the water-gas discharge assembly, the water-gas combined active sealing device guarantees the safe operation of the roller bearing.

[0047] In addition, the application also provides a mine belt conveyor which is equipped with the roller with the water-gas combined active sealing device, so that the belt conveyor can guarantee the normal operation of the roller under the complex working conditions such as high humidity, high dust and water immersion in the coal mine underground, and further guarantees the long time safe and reliable operation of the belt conveyor. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0049] Figure 1 It is a cooperation structure cross-sectional view of the roller assembly and the water-gas combined active sealing device in the present application;

[0050] Figure 2 It is a specific structure cross-sectional view of the water-gas combined active sealing device in the present application;

[0051] Figure 3 It is a three-dimensional structure schematic view of the spring seat in the present application;

[0052] Figure 4 It is a cooperation structure cross-sectional view of the dynamic sealing assembly and the static sealing assembly in the present application;

[0053] Figure 5 It is a specific structure three-dimensional schematic view of the gland in the present application;

[0054] Figure 6 is a sectional view of the water self-sealing structure in the present application;

[0055] Figure 7 is a sectional view of the gas self-sealing structure in the present application;

[0056] Figure 8 is a sectional view of the water and gas discharge assembly in the present application;

[0057] Figure 9 is a schematic diagram of a specific embodiment of the helical groove in the present application;

[0058] Figure 10 is a schematic diagram of the local structure of the belt conveyor in the present application;

[0059] Figure 11 is a schematic diagram of the local structure of the carrier roller module in the present application;

[0060] Figure 12 is a schematic diagram of the structure principle of the gas pump and the gas supply valve block connected to the belt conveyor in the present application;

[0061] Figure 13 is a schematic diagram of the structure principle of the water pump and the water supply valve block connected to the belt conveyor in the present application;

[0062] Figure 14 is a schematic diagram of the structure principle of the water and gas collection tank and the overflow valve block connected to the belt conveyor in the present application;

[0063] Figure 15 is a schematic diagram of the structure principle of the water supply tank and the backwater valve block connected to the belt conveyor in the present application.

[0064] In the figure: the roller assembly 1, the roller shaft 101, the roller cylinder 102, the bearing seat 103, the bearing 104, the bearing washer 105, the bearing circlip 106; the water-gas combined sealing device 2; the water self-sealing structure 3, the gland 301, the annular boss 302, the sixth sealing ring 303, the set screw 304; the gas self-sealing structure 4; the dynamic sealing assembly 5, the dynamic ring seat 501, the connecting part 502, the first sealing part 503, the dynamic ring 504, the helical groove 505, the first sealing ring 506, the second sealing ring 507; the static sealing assembly 6, the static ring seat 601, the second sealing part 602, the folded part 603, the static ring 604, the spacing channel 605, the third sealing ring 606, the fourth sealing ring 607; the spring pre-tightening mechanism 7, the spring seat 701, the spring seat circlip 702, the locking screw 703, the spring 704, the compression nut 705, the fifth sealing ring 706, the passage hole 707; the pre-tightening area 8; the safety leakage gas cavity 9; the positive pressure water cavity 10; the water supply assembly 11, the first water supply pipeline 1101, the first port 1102, the second port 1103, the second water supply pipeline 1104, the water supply external pipeline 1105, the water inlet port 1106, the water outlet port 1107, the first annular groove 1108, the second annular groove 1109; the positive pressure gas cavity 12; the gas supply assembly 13, the gas supply pipeline 1301, the gas supply external pipeline 1302; the water-gas discharge assembly 14, the water-gas mixed discharge pipeline 1401, the internal leakage water collection groove 1402, the water-gas mixed discharge external pipeline 1403, the overflow valve 1404; the belt conveyor body 15, the driving roller 1501, the driven roller 1502, the conveyor belt 1503; the roller module 16, the support frame 1601, the gas supply valve block 1602, the water supply valve block 1603, the overflow valve block 1604, the backwater valve block 1605; the gas pump 17, the gas supply pipeline 1701, the gas supply pipeline tee joint 1702; the water pump 18, the water supply pipeline 1801, the water supply pipeline tee joint 1802; the water-gas collection tank 19, the water-gas pipeline 1901, the water-gas pipeline tee joint 1902; the backwater collection device 20, the backwater external pipeline 2001; the water supply tank 21, the backwater pipeline 2101, the backwater pipeline tee joint 2102. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0066] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0067] In this technical solution, a roller equipped with a water-air combined active sealing device, such as Figure 1 As shown, it includes a roller assembly 1 and a water-air combined active sealing device. Specifically, the water-air combined active sealing device includes a water-air composite sealing device 2 and a water self-sealing structure 3 and an air self-sealing structure 4 that cooperate with the water-air composite sealing device 2, wherein:

[0068] like Figures 1-2 As shown, the idler assembly 1 includes an idler shaft 101, an idler cylinder 102 is sleeved on the outside of the idler shaft 101, a bearing seat 103 is provided between the idler shaft 101 and the idler cylinder 102, and a set of bearings 104 is provided between the bearing seat 103 and the idler shaft 101. Each bearing 104 is provided with a water-air combination active sealing device on its outer side. In addition, a bearing washer 105 is provided on the side of the bearing 104 away from the water-air combination active sealing device, and a bearing retainer 106 is provided on the side of the bearing 104 close to the water-air combination active sealing device. The bearing retainer 106 is fixedly connected to the idler shaft 101 to fix the inner ring of the bearing 104 on the idler shaft 101 to prevent its axial movement. On this basis, the water-air combination active sealing device is used to seal high humidity gas, dust and water and other media in the external environment.

[0069] Specifically in water-air combined active sealing devices, such as Figure 2 As shown, the water-air composite sealing device 2 includes a dynamic sealing assembly 5 and a static sealing assembly 6 that are configured to cooperate with each other, wherein:

[0070] like Figure 2 , Figure 4As shown, the dynamic sealing assembly 5 includes a whole stepped dynamic ring seat 501, which is composed of a connecting part 502 and a first sealing part 503, and the connecting part 502 is connected with the bearing seat 103 through the set screw 304, at this time, there is an annular space between the first sealing part 503 and the bearing seat 103, and the dynamic ring 504 is matched and arranged in the annular space, the dynamic ring 504 is connected with the dynamic ring seat 501 through the first anti-rotation pin, and the dynamic ring seat 501 and the dynamic ring 504 rotate with the roller cylinder 102.

[0071] As shown, Figure 2 the static sealing assembly 6 includes a static ring seat 601 with a radial cross-section in the shape of "L", and the static ring seat 601 is composed of a second sealing part 602 and a folded part 603, wherein, there is a spacing channel 605 between the circumferential outer surface of the second sealing part 602 and the bearing seat 103, the spacing channel 605 is communicated with the external environment, the end of the folded part 603 is matched with the circumferential outer surface of the roller shaft 101, in addition, the end of the second sealing part 602 is provided with a static ring 604, and the static ring 604 is connected with the static ring seat 601 through the second anti-rotation pin.

[0072] On this basis, as shown, Figures 2-4 the static sealing assembly 6 further includes a spring pre-tightening mechanism 7 arranged between the static ring seat 601 and the roller shaft 101, the spring pre-tightening mechanism 7 includes a spring seat 701 sleeved on the roller shaft 101, the axial both sides of the spring seat 701 are provided with spring seat clamping springs 702, and the spring seat 701 is fixed and limited on the roller shaft 101 through the spring seat clamping springs 702, at this time, during the rotating operation of the roller cylinder 102, the spring seat 701 and the roller shaft 101 are in a static state.

[0073] As shown, Figures 3-4 on one side of the spring seat 701, there is a spacing area between the spring seat 701 and the static ring seat 601, which is configured as a pre-tightening area 8, on the other side of the spring seat 701, the spring seat 701, the dynamic sealing assembly 5, the static ring 604 and the roller shaft 101 form a safety leakage cavity 9.

[0074] In addition, a plurality of locking bolts 703 and a plurality of channel holes 707 are uniformly arranged on the spring seat 701 along the circumferential direction, the end of the locking bolt 703 is stretched out from the other side of the folded part 603 after penetrating the spring seat 701, the pre-tightening area 8 and the folded part 603 in turn, the spring 704 is sleeved on the outer wall of the locking bolt 703, and the spring 704 is located in the pre-tightening area 8, and the end of the locking bolt 703 is further matched with the compression nut 705, thereby, under the premise that the spring seat 701 follows the roller shaft 101 in a static state, the whole spring pre-tightening mechanism 7 and the static ring 604 are also in a static state.

[0075] Based on the preliminary structure installation cooperation of the dynamic sealing assembly 5 and the static sealing assembly 6, the core structure in the technical solution is that the end of the static ring 604 is attached to the end of the dynamic ring 504, and the static ring seat 601 is moved to the direction close to the dynamic ring seat 501 by screwing the compression nut 705, at this time, the spring 704 in the pre-tightening area 8 is also compressed and pre-tightened due to the movement of the static ring seat 601, and thus the spring 704 generates a trend of releasing the elastic force to the static ring seat 601, under the trend, the locking bolt 703 cooperates with the screwed compression nut 705, so that the static ring 604 and the dynamic ring 504 are pre-tightened and attached to form an attached sealing part, in this structure, the multi-element medium in the external environment is intercepted and sealed when running to the attached sealing part through the spacing channel 605, the elastic force released by the spring 704 to the static ring seat 601 is called spring pre-tightening force in the application.

[0076] It should be noted that when the roller is in a working state, the dynamic ring seat 501 and the dynamic ring 504 will rotate with the roller cylinder 102, and the spring pre-tightening mechanism 7 and the static ring 604 will be in a static state, so the part attached by the dynamic ring 504 and the static ring 604 will inevitably produce friction loss, that is, the gap of the attached sealing part will become larger and larger, and thus the sealing ability will become worse and worse, therefore, when the roller works for a period of time, the attached sealing part can be compensated by adjusting the compression nut 705 to improve the service life of the water and gas combined sealing device 2.

[0077] Accordingly, under the action of the attached sealing part, the water and gas combined active sealing device can intercept the multi-element medium such as dust, high humidity gas and water in the external environment, prevent it from entering the bearing area through the water and gas combined active sealing device, and thus affect the normal operation of the bearing 104.

[0078] Based on the specific structure and action of the water and gas combined active sealing device, the device is further designed in the application, which actively intercepts and seals the multi-element medium such as dust, high humidity gas and water in the external environment by means of water and gas combination.

[0079] Specifically, the water and gas combined active sealing device further comprises a water self-sealing structure 3 and a gas self-sealing structure 4 which are arranged in cooperation with the water and gas combined sealing device 2.

[0080] As shown in Figures 5-6 The water self-sealing structure 3 comprises a gland 301 which is in a whole circular ring structure, the gland 301 is located outside the static ring seat 601, and the gland 301 is connected with the static ring seat 601 through a locking bolt 304, in addition, the gland 301 is provided with an annular boss 302 on the circumferential outer wall thereof, and there is a gap between the annular boss 302 and the bearing seat 103.

[0081] On this basis, the area formed by the annular boss 302, the gland 301 and the spacing channel 605 is configured as a positive pressure water cavity 10, the positive pressure water cavity 10 is supplied with positive pressure water through the water supply assembly 11, and after the entire positive pressure water cavity 10 is filled with water, the water flows out of the gap between the annular boss 302 and the bearing seat 103 to form the water-air combined active sealing device.

[0082] Based on the above structure, the water supply assembly 11 supplies water to the positive pressure water cavity 10, and the positive pressure water cavity 10 is filled with positive pressure water, which is essentially to isolate dust, high humidity gas and water in the external environment from the outside of the water-air combined active sealing device when the water flows out of the gap between the annular boss 302 and the bearing seat 103, thereby realizing water-based active self-sealing.

[0083] More specifically, as shown in Figures 5-6 , the water supply assembly 11 includes first water supply pipelines 1101 opened on the gland 301, and the first water supply pipelines 1101 are uniformly arranged in the radial direction of the gland 301, and each of the first water supply pipelines 1101 includes a first port 1102 and a second port 1103, the first port 1102 is located on the circumferential outer surface of the gland 301 and communicates with the positive pressure water cavity 10, in addition, the water supply assembly 11 further includes a first annular groove 1108 opened on the circumferential inner wall of the gland, the radial section of the first annular groove 1108 is rectangular, and the second port 1103 of each of the first water supply pipelines 1101 communicates with the first annular groove 1108.

[0084] In addition, as shown in Figure 6 , the water supply assembly 11 further includes a second water supply pipeline 1104, a second annular groove 1109 arranged on the circumferential outer surface of the idler shaft 101, and a water supply external pipeline 1105, wherein the second water supply pipeline 1104 is arranged inside the idler shaft 101, the second water supply pipeline 1104 includes a water inlet port 1106 and a water outlet port 1107, the water outlet port 1107 is located in the second annular groove 1109, the radial section of the second annular groove 1109 is also rectangular, and the second annular groove 1109 corresponds to the position of the first annular groove 1108, in addition, the axial width of the second annular groove 1109 is smaller than the axial width of the first annular groove 1108, thereby, during the process of tightening the compression nut 705 to compensate for the wear between the static ring 604 and the dynamic ring 504, that is, during the process that the gland 301, the static ring seat 601 and the static ring 604 move to the side close to the dynamic ring 504 through the compression nut 705, the second annular groove 1109 is always within the axial width of the first annular groove 1108, ensuring the stable supply of high-pressure water, in addition, the water inlet port 1106 is located on the end face of the idler shaft 101 and is connected with the water supply external pipeline 1105, the other end of the water supply external pipeline 1105 is connected with a water source, and the water source can be a water supply tank or the like.

[0085] On this basis, the water supply assembly 11 further comprises a backwater collecting device 20 arranged below the carrier roller assembly 1, which is used to collect the water flowing out from the positive pressure water cavity 10 through the gap between the annular boss 302 and the bearing seat 103. In addition, the backwater collecting device 20 is in communication with the water source, and is used to pass the collected water into the water source, so as to realize water circulation.

[0086] It should be noted that, although the water self-sealing structure 4 fills the positive pressure water cavity 10 with water to realize active sealing based on water, the water in the positive pressure water cavity 10 will also flow to the position of the abutment sealing part formed by the static ring 504 and the dynamic ring 604. At this time, the water in the positive pressure water cavity 10 is equivalent to the medium that is blocked and intercepted. Therefore, how to seal the water flowing to the position of the abutment sealing part by the water-air combined active sealing device to prevent the water from affecting the normal operation of the bearing 104 is the main problem to be solved by the water-air combined active sealing device in the subsequent application.

[0087] As shown in Figures 7-8 The gas self-sealing structure 4 comprises a cavity formed between the connecting part 502 and the carrier roller shaft 101, and the cavity is configured as a positive pressure gas cavity 12. The positive pressure gas cavity 12 is supplied with positive pressure gas by the gas supply assembly 13. In addition, the gas self-sealing structure 4 further sets a radial sealing gap between the first sealing part 503 and the carrier roller shaft 101.

[0088] In the application, under the premise of gas supply by the gas supply assembly 13, after the positive pressure gas fills the entire positive pressure gas cavity 12, the positive pressure gas reaches the safe leakage gas cavity 9 through the radial sealing gap, and then penetrates into the position of the abutment sealing part formed between the static ring 504 and the dynamic ring 604 under the action of gas pressure to form a positive pressure gas film. In addition, during the relative rotation of the static ring 504 and the dynamic ring 604, a dynamic pressure gas film is further formed in the abutment sealing part. The dynamic pressure gas film cooperates with the positive pressure gas film to seal the water located at the position of the abutment sealing part.

[0089] In fact, the ideal state is that the pressure provided by the positive pressure gas film and the dynamic pressure gas film at the position of the abutment sealing part blocks the positive pressure water outside the abutment sealing part to form a positive pressure sealing effect. In addition, the positive pressure sealing simultaneously plays a sealing and lubricating role, that is, the generation of the positive pressure gas film and the dynamic pressure gas film makes the friction torque between the dynamic ring 604 and the static ring 504 extremely small, which can meet the long-life use requirement.

[0090] If the positive pressure gas film, the dynamic pressure gas film and the water film coexist on the abutment sealing part, and the positive pressure gas film and the dynamic pressure gas film are collectively referred to as a gas film, then the gap near the outer side of the circumference of the abutment sealing part is the water film, and the gap near the inner side of the circumference of the abutment sealing part is the gas film. At this time, the gas film can still play a lubricating and sealing role, and the friction torque between the dynamic ring 604 and the static ring 504 is also extremely small.

[0091] On this basis, the water gas combination active sealing device can also have the problem that the positive pressure water penetrates the gas film and leaks from the close sealing part to the safety leakage air cavity 9. In order to prevent the internal leakage water in the safety leakage air cavity 9 from affecting the normal work of the bearing 104, the positive pressure gas in the positive pressure air cavity 12 and the spiral groove 505 together carry the internal leakage water in the safety leakage air cavity 9 through the passage hole 707 into the pre-tightening area 8, and finally the water gas exhaust assembly 14 exhausts the internal leakage water and gas in the pre-tightening area 8 from the water gas combination active sealing device.

[0092] Then, how to realize the above-mentioned effects by using specific structures, the specific structures of the gas supply assembly 13, the radial sealing gap and the water gas exhaust assembly 14 will be demonstrated in the following.

[0093] More specifically, as shown in Figure 7 The gas supply assembly 13 includes a gas supply pipeline 1301 arranged in the inside of the supporting roller shaft 101. One end of the gas supply pipeline 1301 is located on the circumferential outer surface of the supporting roller shaft 101 and is in communication with the positive pressure air cavity 12. The other end of the gas supply pipeline 1301 is located on the end surface of the supporting roller shaft 101 and is connected with a gas supply external pipeline 1302. The other end of the gas supply external pipeline 1302 is connected with a gas source, which can be an air compressor or the like.

[0094] In addition, as shown in Figures 8-9 In the gas self-sealing structure 4, the first sealing part 503 is provided with a spiral groove 505 on the circumferential inner wall close to the supporting roller shaft 101. The center line of the spiral groove 505 coincides with the axis of the supporting roller shaft 101.

[0095] In a specific embodiment, the X direction shown in the configuration diagram 9 is the positive direction. Taking the positive direction as the reference, when the ring seat 501 and the ring 504 rotate in the counterclockwise direction with the supporting roller cylinder body 102, the spiral groove 505 arranged on the first sealing part 503 is right-handed. According to the fluid pumping effect of the spiral groove 505 in rotation, the gas in the radial sealing gap generates a pressure difference. The pressure difference in the radial sealing gap is in the axial direction of the ring seat 501 to the right, as shown in Figure 9 The solid arrow direction in the figure shows the direction from large to small of the pressure generated by the fluid pumping effect of the spiral groove 505 in the radial sealing gap.

[0096] It should be noted that the above-mentioned embodiment related to the rotation direction of the spiral groove 505 is based on Figure 9The orientation of the partial structure shown is an example, and in the roller assembly 1, two bearings 104 are correspondingly provided, and in the water-gas combined active sealing device matched with the two bearings 104, the rotation direction of the helical groove 505 is opposite, that is, the direction of the fluid pumping effect provided by the two helical grooves 505 in the roller assembly 1 is: along the axial direction of the roller shaft 101 towards both sides of the roller shaft 101 with the roller shaft 101 as the center.

[0097] As shown in the figure, Figure 8 The water-gas discharge assembly 14 includes a water-gas mixed discharge pipeline 1401 arranged inside the roller shaft 101 and an internal leakage water collection groove 1402 opened on the roller shaft 101, wherein the internal leakage water collection groove 1402 is arranged along the circumference of the roller shaft 101, and the internal leakage water collection groove 1402 is located in the pre-tightening area 8. In addition, one end of the water-gas mixed discharge pipeline 1401 is in communication with the internal leakage water collection groove 1402, and the other end is connected with a water-gas mixed discharge external pipeline 1403, and the water-gas mixed discharge external pipeline 1403 is also connected with an overflow valve 1404.

[0098] In addition, the port of the water-gas mixed discharge pipeline 1401 in communication with the internal leakage water collection groove 1402 is located directly below the axis of the roller shaft 101. This arrangement is because the water flowing into the safety leakage air chamber 9 through the sealing part is small, and the water will gather below the entire safety leakage air chamber 9, so as to discharge the water in the safety leakage air chamber 9 through the water-gas discharge assembly 14 as much as possible.

[0099] Therefore, under the cooperation of the positive pressure air chamber 12, the radial sealing gap and the overflow valve 1404, the air self-sealing structure 4 will intermittently discharge the internal leakage water flowing into the safety leakage air chamber 9, preventing the internal leakage water from affecting the normal operation of the bearing 104.

[0100] Based on the above analysis of the water self-sealing structure 3 and the air self-sealing structure 4, although the water-gas combined active sealing device can achieve corresponding active sealing effect, there is still a risk of multi-medium leakage in some sealing surfaces in the entire device. Therefore, the present application also sets several sealing rings for this problem.

[0101] Specifically, as shown in the figure, Figure 2As shown, the connecting part 502 of the movable ring seat 501 is provided with a first sealing groove on the circumferential surface abutting the bearing seat 103, and the first sealing groove is provided with a first sealing ring 506, preventing leakage of the multi-element medium from between the connecting part 502 and the bearing seat 103; the first sealing part 503 of the movable ring seat 501 is provided with a second sealing groove on the circumferential surface abutting the movable ring 504, and the second sealing groove is provided with a second sealing ring 507, preventing leakage of the multi-element medium from between the first sealing part 503 and the movable ring 504; the folded part 603 of the stationary ring seat 601 is provided with a third sealing groove on the circumferential surface abutting the carrier roller shaft 101, and the third sealing groove is provided with a third sealing ring 606, preventing leakage of the multi-element medium from between the folded part 603 and the carrier roller shaft 101; the second sealing part 602 of the stationary ring seat 601 is provided with a fourth sealing groove on the end surface abutting the stationary ring 604, and the fourth sealing groove is provided with a fourth sealing ring 607, preventing leakage of the multi-element medium from between the second sealing part 602 and the stationary ring 604; the spring seat 701 is provided with a fifth sealing groove on the circumferential surface abutting the second sealing part 602, and the fifth sealing groove is provided with a fifth sealing ring 706, preventing leakage of the multi-element medium from between the second sealing part 602 and the stationary ring 604; the gland 301 is provided with two sixth sealing grooves on the circumferential surface abutting the carrier roller shaft 101, and the two sixth sealing grooves are respectively located on the two sides of the first water supply pipeline 1101, and each sixth sealing groove is provided with a sixth sealing ring 303, preventing leakage of the multi-element medium from between the gland 301 and the carrier roller shaft 101.

[0102] At this point, the carrier roller assembly 1 can complete the sealing protection of the bearing 104 by using the water-air combined active sealing device, and reliable sealing can be achieved in dust environment, high humidity gas environment and water immersion environment, and the like. It needs to be noted that when the carrier roller assembly 1 is in a water immersion environment, the pressure of the designed positive pressure water flowing out of the gap between the annular boss 302 and the bearing seat 103 is greater than the pressure of the external water, so that the sealing effect of the external water can be achieved.

[0103] Based on the above structure, the application further provides a mine belt conveyor, which is equipped with the above-mentioned carrier roller with a water-air combined active sealing device, such as Figure 10 As shown, comprising: a belt conveyor body 15 and a plurality of carrier roller modules 16, wherein:

[0104] The belt conveyor body 15 comprises a driving roller 1501 and a driven roller 1502 respectively arranged at both ends of the belt conveyor body 15, the driving roller 1501 is connected with a power assembly, and the driving roller 1501 is provided with rotary power by the power assembly, in addition, the driving roller 1501 and the driven roller 1502 are jointly rotatably connected with a conveying belt 1503.

[0105] It should be noted that the present application only improves the sealing problem in the roller, and applies it to the mine belt conveyor on this basis, so the power assembly driving the belt conveyor is not limited here, and the common driving mode of the belt conveyor in the prior art can be used.

[0106] As shown in Figures 10-15 A plurality of roller modules 16 are arranged on the belt conveyor body 15 through the support frame 1601, and the plurality of roller modules 16 are located between the driving drum 1501 and the driven drum 1502, wherein each roller module 16 includes three groups of roller assemblies 1 above the support frame 1601 and one group of roller assemblies 1 below the support frame 1601. Above the support frame 1601, the three groups of roller assemblies 1 form a "U"-shaped roller groove for supporting the conveyor belt 1503.

[0107] On this basis, each roller module 16 includes a gas supply valve block 1602, a water supply valve block 1603, an overflow valve block 1604, and a water return valve block 1605, wherein:

[0108] In the four groups of roller assemblies 1 in the roller module 16, there are eight gas supply external pipelines 1302, and the gas supply valve block 1602 is connected with the eight gas supply external pipelines 1302.

[0109] In the four groups of roller assemblies 1 in the roller module 16, there are eight water supply external pipelines 1105, and the water supply valve block 1603 is connected with the eight water supply external pipelines 1105.

[0110] In the four groups of roller assemblies 1 in the roller module 16, there are eight water-gas mixed discharge external pipelines 1403, and the overflow valve block 1604 is connected with the eight water-gas mixed discharge external pipelines 1403.

[0111] In the four groups of roller assemblies 1 in the roller module 16, there are eight water return collection devices 20, and the water return valve block 1605 is connected with the eight water return collection devices 20 through eight water return external pipelines 2001.

[0112] In addition, as shown in Figures 12-15 The belt conveyor further includes a gas pump 17, a water pump 18, a water-gas collection tank 19, and a water supply tank 21, wherein:

[0113] The gas pump 17 is connected with the gas supply valve block 1602 in each roller module 16 through the gas supply pipeline 1701 and a plurality of gas supply pipeline tees 1702, for simultaneously supplying gas to a plurality of gas supply valve blocks 1602, and then supplying gas to each roller assembly 1 in each roller module 16. At this time, the gas pump 17 can be regarded as the gas source mentioned above in the gas supply assembly 13.

[0114] The water pump 18 is communicated with the water supply tank 21, and the water pump 18 is connected with the water supply valve block 1603 in each idler module 16 through the water supply pipeline 1801 and a plurality of water supply pipeline three-way joints 1802, for simultaneously supplying water to a plurality of water supply valve blocks 1603, and then supplying water to each idler assembly 1 in each idler module 16, at this time, the water supply tank 21 can be regarded as the water source mentioned above in the water supply assembly 11.

[0115] The water and gas collection tank 19 is connected with the overflow valve block 1604 in each idler module 16 through the water and gas pipeline 1901 and a plurality of water and gas pipeline three-way joints 1902, for simultaneously receiving the water and gas output by a plurality of overflow valve blocks 1604, and then simultaneously receiving the water and gas discharged by each idler assembly 1 in each idler module 16.

[0116] The water supply tank 21 is connected with the water return valve block 1605 in each idler module 16 through the water return pipeline 2101 and a plurality of water return pipeline three-way joints 2102, and a filtering system is arranged on the water return pipeline 2101, and the water in the water return collection device 20 in each idler module 16 is returned to the water supply tank 21 after passing through the filtering system for recycling.

[0117] On this basis, the water and gas collection tank 19 and the water supply tank 21 are also communicated through a connecting pipeline, and a filtering system is also arranged on the connecting pipeline, and the water and gas in the water and gas collection tank 19 are also gathered into the water supply tank 21 after being exhausted and filtered.

[0118] Specifically, the water and gas combined active sealing device is arranged outside the bearing 104 in the idler assembly 1, on the basis that the dynamic ring 504 and the static ring 604 are attached to form the only passage of the attached sealing part, the water self-sealing structure 3 fills the positive pressure water cavity 10 formed by the annular boss 302, the gland 301 and the spacing channel 605 with water, so as to actively intercept the dust, high humidity gas and water and other multi-element media in the external environment, and this effect is equivalent to replacing all the dust, high humidity gas and water and other multi-element media with water, that is, the water and gas combined active sealing device only needs to consider the sealing of water, and on this basis, the gas self-sealing structure 4 supplies gas to the positive pressure gas cavity 12 inside the water and gas combined active sealing device, and the gas pressure of the positive pressure gas cavity plays a sealing role on the water in the positive pressure water cavity 10 on the sealing gap between the dynamic ring 504 and the static ring 604 of the water and gas combined sealing device 2. At the same time, on the basis of the positive pressure gas and the fluid pumping effect provided by the spiral groove 505, the internal leakage water leaked to the safety leakage gas cavity 9 through the attached sealing part is discharged from the water and gas combined active sealing device by the water and gas discharge assembly 14, and the multi-working condition sealing of the idler is realized.

[0119] In addition, the application further provides a mine belt conveyor which is equipped with a carrier roller with a water and gas combined active sealing device, so that the belt conveyor can ensure normal operation of the carrier roller under complex working conditions such as high dust, high humidity or immersion in coal mine underground, and further ensure long time safe and reliable operation of the belt conveyor.

[0120] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing embodiments of the application are described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A carrier roller provided with a water vapor combination active sealing device, characterized in that, The application relates to a water-gas combined active sealing device. The water-gas combined active sealing device comprises a water-gas combined sealing device and a water self-sealing structure and a gas self-sealing structure which are arranged in cooperation with the water-gas combined sealing device. The water-gas combined sealing device comprises a dynamic sealing assembly and a static sealing assembly which are arranged in cooperation. The dynamic sealing assembly comprises a dynamic ring seat which is in a whole step shape, the dynamic ring seat is composed of a connecting part and a first sealing part which are integrally formed, the connecting part is connected with the bearing seat through a locking bolt, at this time, an annular space exists between the first sealing part and the bearing seat, and a dynamic ring is arranged in cooperation in the annular space, the dynamic ring seat and the dynamic ring rotate with the roller barrel, a radial sealing gap is formed between the first sealing part and the roller shaft, and a spiral groove is arranged on the circumferential inner wall of the first sealing part close to the roller shaft, the center line of the spiral groove is coincident with the axis of the roller shaft. The static sealing assembly comprises a static ring seat which is in an "L" shape in the radial section, and the static ring seat is composed of a second sealing part and a folded part which are integrally formed, an interval channel exists between the circumferential outer surface of the second sealing part and the bearing seat, the interval channel is communicated with the external environment, the end of the folded part is attached to the circumferential outer surface of the roller shaft, and a static ring is arranged on the end of the second sealing part, and the end of the static ring is attached to the end of the dynamic ring. The static sealing assembly further comprises a spring pre-tightening mechanism which is arranged between the static ring seat and the roller shaft, the spring pre-tightening mechanism comprises a spring seat which is arranged on the roller shaft, spring seat clamping springs are arranged on the two axial sides of the spring seat, the spring seat is fixed on the roller shaft through the spring seat clamping springs, an interval area exists between the spring seat and the static ring seat on one side of the spring seat, the interval area is configured as a pre-tightening area, a safety leakage cavity is formed among the spring seat, the dynamic sealing assembly, the static ring and the roller shaft on the other side of the spring seat, a plurality of locking bolts and a plurality of channel holes are uniformly arranged on the spring seat along the circumferential direction of the spring seat, the ends of the locking bolts are stretched out from the other side of the folded part after the locking bolts pass through the spring seat, the pre-tightening area and the folded part in sequence, springs are arranged on the outer wall of the locking bolts, and the springs are located in the pre-tightening area, a pressing nut is arranged on the end of the locking bolt in cooperation, the static ring seat is driven to move towards the dynamic ring seat by screwing the pressing nut, the static ring and the dynamic ring are pre-tightened and attached to each other to form an attached sealing part, and the multi-element medium in the external environment is intercepted and sealed when the multi-element medium runs to the attached sealing part through the interval channel.

2. The carrier roller with water vapor combination active sealing device according to claim 1, characterized in that: ​ The water self-sealing structure comprises a cover in the shape of a whole ring, which is located outside the static ring seat and connected with the static ring seat through a fastening bolt. The cover is provided with a ring-shaped boss on the circumferential outer wall. The ring-shaped boss and the bearing seat have a gap therebetween. The ring-shaped boss, the cover and the gap form a positive pressure water cavity. The positive pressure water cavity is supplied with positive pressure water through a water supply assembly. After the positive pressure water fills the whole positive pressure water cavity, the water flows out of the gap between the ring-shaped boss and the bearing seat to form a combined active sealing device. The positive pressure water also flows from the abutting sealing part to a safety leakage gas cavity, and the flow to the safety leakage gas cavity is configured as internal leakage water. The air self-sealing structure comprises a cavity formed between the connecting part and the roller shaft. The cavity is configured as a positive pressure gas cavity. The positive pressure gas cavity is supplied with positive pressure gas through a gas supply assembly. On the basis that the positive pressure gas fills the whole positive pressure gas cavity, the gas flows from the radial sealing gap to the safety leakage gas cavity, carries the water in the safety leakage gas cavity and then enters the pre-tightening area through the passage hole. Finally, the water and gas in the pre-tightening area are discharged from the water and gas discharge assembly to the water and gas combined active sealing device.

3. The carrier roller with water vapor combination active sealing device according to claim 2, characterized in that: In the roller assembly, the bearing is provided with a bearing washer on the side away from the water and gas combined active sealing device, and is provided with a bearing snap spring on the side close to the water and gas combined active sealing device. The bearing snap spring is fixedly connected with the roller shaft. The movable ring and the movable ring seat are connected through a first anti-rotation pin, and the static ring and the static ring seat are connected through a second anti-rotation pin.

4. The carrier roller with water vapor combination active sealing device according to claim 3, characterized in that: In the water self-sealing structure, the water supply assembly comprises a first water supply pipeline opened on the cover. The first water supply pipeline is uniformly arranged with four first water supply pipelines along the radial direction of the cover. Each first water supply pipeline comprises a first port and a second port. The first port is located on the circumferential outer surface of the cover and is in communication with the positive pressure water cavity. The water supply assembly further comprises a first annular groove opened on the circumferential inner wall of the cover. The radial section of the first annular groove is in the shape of a rectangle. The second port of each first water supply pipeline is in communication with the first annular groove. The water supply assembly further comprises a second water supply pipeline, a second annular groove arranged on the circumferential outer surface of the roller shaft and a water supply external pipeline. The second water supply pipeline is opened inside the roller shaft. The second water supply pipeline comprises a water inlet port and a water outlet port. The water outlet port is located in the second annular groove. The radial section of the second annular groove is also in the shape of a rectangle. The position of the second annular groove corresponds to the position of the first annular groove. The axial width of the second annular groove is smaller than the axial width of the first annular groove. During the whole process that the cover, the static ring seat and the static ring move to the side close to the movable ring through the compression nut, the second annular groove is always within the axial width range of the first annular groove. The water inlet port is located on the end face of the roller shaft and is connected with the water supply external pipeline. The other end of the water supply external pipeline is connected with a water source. The water supply assembly further comprises a backwater collecting device arranged below each of the carrier roller assemblies, which is used to collect water flowing out from the positive pressure water cavity through the gap between the annular boss and the bearing seat, and is in communication with the water source to realize water circulation.

5. The carrier roller with water vapor combination active sealing device according to claim 4, characterized in that: In the air self-sealing structure, the air supply assembly comprises an air supply pipeline arranged inside the carrier roller shaft, one port of the air supply pipeline is located on the circumferential outer surface of the carrier roller shaft and is in communication with the positive pressure air cavity, the other port of the air supply pipeline is located on the end surface of the carrier roller shaft and is connected with an air supply external pipeline, and the other end of the air supply external pipeline is connected with an air source. The water and air mixed discharge assembly comprises a water and air mixed discharge pipeline arranged inside the carrier roller shaft and an internal leakage water collecting groove arranged on the carrier roller shaft, the internal leakage water collecting groove is arranged along the circumference of the carrier roller shaft and is located in the pre-tightening area, one port of the water and air mixed discharge pipeline is in communication with the internal leakage water collecting groove, and the other port is connected with a water and air mixed discharge external pipeline, and an overflow valve is further connected to the water and air mixed discharge external pipeline.

6. The carrier roller with water vapor combination active sealing device according to claim 5, characterized in that: The port of the water and air mixed discharge pipeline in communication with the internal leakage water collecting groove is located directly below the axis of the carrier roller shaft.

7. The carrier roller with water vapor combination active sealing device according to claim 6, characterized in that: In the water and air combined active sealing device, the connecting part of the movable ring seat is provided with a first sealing groove on the circumferential surface in contact with the bearing seat, and a first sealing ring is arranged in the first sealing groove; The first sealing part of the movable ring seat is provided with a second sealing groove on the circumferential surface in contact with the movable ring, and a second sealing ring is arranged in the second sealing groove; The folded part of the stationary ring seat is provided with a third sealing groove on the circumferential surface in contact with the carrier roller shaft, and a third sealing ring is arranged in the third sealing groove; The second sealing part of the stationary ring seat is provided with a fourth sealing groove on the end surface in contact with the stationary ring, and a fourth sealing ring is arranged in the fourth sealing groove; The spring seat is provided with a fifth sealing groove on the circumferential surface in contact with the second sealing part, and a fifth sealing ring is arranged in the fifth sealing groove; The gland is provided with two sixth sealing grooves on the circumferential surface in contact with the carrier roller shaft, and the two sixth sealing grooves are respectively located on the two sides of the first water supply pipeline, and a sixth sealing ring is arranged in each sixth sealing groove.

8. A mining belt conveyor characterized by: The carrier roller comprising the water and air combined active sealing device according to claim 7 further comprises: The belt conveyor body comprises a driving roller and a driven roller arranged at the two ends of the belt conveyor body respectively, the driving roller is connected with a power assembly, and the driving roller is provided with rotary power by the power assembly, and the driving roller and the driven roller are jointly and rotatably connected with a conveying belt; A plurality of carrier roller modules are arranged on the belt conveyor body by the support frame, and the plurality of carrier roller modules are located between the driving roller and the driven roller, each carrier roller module comprises three groups of carrier roller assemblies arranged above the support frame and one group of carrier roller assemblies arranged below the support frame, and the three groups of carrier roller assemblies form a "U"-shaped carrier roller groove above the support frame, and the carrier roller groove is used for supporting the conveying belt.

9. A mining belt conveyor according to claim 8, characterised in that: Each of the carrier roller modules comprises an air supply valve block, a water supply valve block, an overflow valve block and a backwater valve block: In the four groups of roller assemblies in the roller module, there are eight said air supply external pipelines, the air supply valve block is connected with the eight air supply external pipelines; In the four groups of roller assemblies in the roller module, there are eight said water supply external pipelines, the water supply valve block is connected with the eight water supply external pipelines; In the four groups of roller assemblies in the roller module, there are eight said water and air mixed discharge external pipelines, the overflow valve block is connected with the eight water and air mixed discharge external pipelines; In the four groups of roller assemblies in the roller module, there are eight said water collection devices, the water return valve block is connected with the eight water collection devices through eight water return external pipelines.

10. A mining belt conveyor according to claim 9, characterized in that: The belt conveyor further comprises an air pump, a water pump, a water and air collection tank and a water supply tank: The air pump is connected with the air supply valve block in each roller module through the air supply pipeline and a plurality of air supply pipeline three-ways, for simultaneously supplying air to a plurality of air supply valve blocks, and then supplying air to each roller assembly in each roller module; The water pump is connected with the water supply tank, and the water pump is connected with the water supply valve block in each roller module through the water supply pipeline and a plurality of water supply pipeline three-ways, for simultaneously supplying water to a plurality of water supply valve blocks, and then supplying water to each roller assembly in each roller module; The water and air collection tank is connected with the overflow valve block in each roller module through the water and air pipeline and a plurality of water and air pipeline three-ways, for simultaneously receiving the water and air output by a plurality of overflow valve blocks, and then simultaneously receiving the water and air discharged by each roller assembly in each roller module; The water supply tank is connected with the water return valve block in each roller module through the water return pipeline and a plurality of water return pipeline three-ways, and a filter system is arranged on the water return pipeline, and the water in the water collection device in each roller module is returned to the water supply tank after passing through the filter system for recycling; The water and air collection tank and the water supply tank are also connected through a connecting pipeline, and a filter system is also arranged on the connecting pipeline, and the water and air in the water and air collection tank are also gathered in the water supply tank after being discharged and filtered.

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