A vortex fan type moisture-proof and dust-proof carrier roller for underground belt conveyors

Abstract

The application relates to a vortex fan moisture-proof and dust-proof carrier roller for an underground belt conveyor, a labyrinth seal assembly, a bearing seat, a carrier roller shaft and a vortex fan forming an air extraction space. End portions of the carrier roller shaft are provided with an axial air passage connected with a dry and clean air source and a plurality of radial air passages communicated with the axial air passage. The radial air passages are communicated with the air extraction space. The vortex fan is rotated by the roller body to realize the flow of dry and clean gas, so that a dry and clean gas environment is always maintained in the air extraction space, water vapor and coal powder in a coal mine underground are isolated from entering the labyrinth seal assembly, the sealing effect of the carrier roller is improved, the moisture-proof and dust-proof capacity of the carrier roller is improved, water vapor and coal powder cannot enter bearings along gaps in the labyrinth seal assembly to cause damage of the carrier roller bearing and the carrier roller, water vapor and coal powder cannot be gathered in the gaps to cause large rotating resistance of the carrier roller and easy jamming, and the stability of the carrier roller and the underground belt conveyor is ensured.

Description

Technical Field

[0001] This application relates to the field of idler rollers for belt conveyors, and in particular to a turbine fan-type moisture-proof and dust-proof idler roller for underground belt conveyors. Background Technology

[0002] Idler rollers are a key component of belt conveyors, supporting the conveyor belt for transport. As the most frequently used and replaced part of a belt conveyor, the service life of idler rollers significantly impacts the overall operation, lifespan, and energy consumption of the conveyor. During operation, most idler roller failures are due to poor sealing, especially in the harsh environment of underground coal mines where humidity and dust (coal dust) allow moisture and coal dust to enter the bearings, causing rust, corrosion, and seizing, ultimately leading to bearing damage and the roller's scrapping. Therefore, underground belt conveyors have extremely high requirements for moisture and dust prevention.

[0003] In existing technologies, idler rollers typically use radial labyrinth seal structures (such as the Chinese utility model patent disclosed in patent number 201921350435.3) for bearing sealing. Because the two labyrinth seal rings need to rotate relative to each other, a certain gap exists between them, resulting in limited sealing effectiveness. Moisture and coal dust can easily enter the bearing through this gap, causing rust, corrosion, and seizing, ultimately leading to bearing damage and the scrapping of the idler roller. Most manufacturers increase the number of sealing channels in the radial labyrinth seal structure, increasing the path length and bends of moisture and coal dust entering the bearing through this gap, thus making it more difficult for them to enter. However, this gap still exists, especially in the harsh environment of continuously humid and dusty underground coal mines. Moisture and coal dust can easily enter the bearing through this gap, easily leading to moisture and dust prevention failure, resulting in an unsatisfactory sealing effect for the idler roller, causing bearing damage and the scrapping of the idler roller.

[0004] Meanwhile, water vapor and coal dust entering the gap will usually accumulate there, affecting the relative rotation of the two labyrinth sealing rings. This results in greater resistance during the relative rotation of the two labyrinth sealing rings, and may even cause them to jam and be unable to rotate relative to each other. Consequently, the idler rollers will experience high rotational resistance and are prone to jamming, significantly impacting the stability of the idler rollers and the underground belt conveyor. Summary of the Invention

[0005] Therefore, it is necessary to address the issue that in existing technologies, the radial labyrinth seal structure used for bearing sealing on idler rollers contains gaps. In the harsh, continuously humid and dusty environment of underground coal mines, this can easily lead to the failure of moisture and dust protection, causing damage to the idler roller bearings and ultimately rendering the roller unusable. Furthermore, moisture and coal dust can accumulate in these gaps, resulting in high rotational resistance and a tendency to jam. It is necessary to provide a turbine fan-driven moisture-proof and dust-proof idler roller for underground belt conveyors that can solve the aforementioned problems in the existing technology.

[0006] A turbine fan-driven moisture-proof and dust-proof idler roller for underground belt conveyors includes an idler shaft, a roller body, a turbine fan, a bearing assembly, and a labyrinth seal assembly. The turbine fan is fixedly disposed at the end of the roller body. The bearing housing of the bearing assembly is fixedly disposed inside the roller body. The idler shaft passes through the center of the roller body. The bearing housing and the turbine fan are rotatably engaged with the idler shaft. The bearing of the bearing assembly is disposed between the idler shaft and the bearing housing. The labyrinth seal assembly is sealed between the idler shaft and the bearing housing, and is located between the bearing and the turbine fan. The labyrinth seal assembly, the bearing housing, the idler shaft, and the turbine fan form an air extraction space. The end of the idler shaft has an axial vent hole connected to a dry and clean air source and multiple radial vent holes communicating with the axial vent hole. The radial vent holes communicate with the air extraction space.

[0007] Preferably, in the above-mentioned turbine fan moisture-proof and dust-proof idler roller for underground belt conveyors, the labyrinth seal assembly includes a labyrinth seal and an end cap that abut and seal against each other. The labyrinth seal is sealed between the idler roller shaft and the bearing seat. The end cap is sealed and sleeved on the idler roller shaft and rotates with the bearing seat. The labyrinth seal is located between the bearing and the end cap. The side of the end cap away from the labyrinth seal has an arc-shaped guide surface. The outlet of the radial vent is located between the arc-shaped guide surface and the turbine fan, and the guiding direction of the arc-shaped guide surface points towards the turbine fan.

[0008] Preferably, in the above-mentioned turbine fan moisture-proof and dust-proof idler roller for underground belt conveyors, the turbine fan includes fixedly connected fan blades and a housing, the housing is fixedly connected to the roller body, and the bearing seat is in contact with the housing, the housing has a connecting hole communicating with the air extraction space, and one end of the arc-shaped guide surface extends to the connecting hole and is clearance-fitted with the fan blades.

[0009] Preferably, in the above-mentioned turbine fan moisture-proof and dust-proof idler roller for underground belt conveyors, the angle between the exhaust direction of the turbine fan and the axial direction of the idler roller shaft is 10° to 45°.

[0010] Preferably, in the above-mentioned turbine fan moisture-proof and dust-proof idler roller for underground belt conveyors, the idler roller collar is provided with an airflow baffle, which is located between the radial ventilation hole and the labyrinth seal assembly.

[0011] Preferably, in the above-mentioned turbine fan moisture-proof and dust-proof idler roller for underground belt conveyors, the radius of the axial ventilation hole is a, the radius of the radial ventilation hole is b, and the number is N, satisfying:

[0012] Preferably, in the above-mentioned turbine fan moisture-proof and dust-proof idler roller for underground belt conveyors, the air outlet of the radial ventilation hole is elongated and extends circumferentially along the idler roller shaft.

[0013] Preferably, in the above-mentioned turbine fan moisture-proof and dust-proof idler roller for underground belt conveyors, the angle between the depth direction of the radial ventilation hole and the axial direction of the idler roller shaft is 60° to 80°.

[0014] The technical solution adopted in this application can achieve the following beneficial effects:

[0015] This application discloses a turbine fan-driven moisture-proof and dust-proof idler roller for an underground belt conveyor. The roller body drives the turbine fan to rotate, and the turbine fan draws gas from the extraction space. Dry, clean gas from a dry, clean gas source is drawn into the extraction space through axial and radial ventilation holes. The turbine fan then blows out the dry, clean gas that has entered the extraction space, achieving the flow of dry, clean gas. Furthermore, the turbine fan's rotation requires no external drive; it is entirely driven by the rotation of the conveyor belt. The conveyor belt speed can reach 4 m / s to 5 m / s. Taking a roller body diameter d = 159 mm as an example, the roller body's rotational speed reaches 400 rpm, thus the turbine fan's suction force has strong power. First, during the flow of dry and clean gas, the dry and clean gas drawn out by the turbine fan is blown away from the end of the roller body, fanning away the water vapor and coal dust at the end of the roller body, thus preventing them from approaching or entering the extraction space. Second, even if some water vapor and coal dust enter the extraction space through the gap between the turbine fan and the idler roller shaft, the airflow barrier isolates them, making it difficult for them to break through and contact the labyrinth seal assembly, let alone enter the labyrinth seal assembly and bearings. Furthermore, the airflow formed by the dry and clean gas immediately carries the water vapor and coal dust out of the extraction space, preventing them from lingering in the extraction space or breaking through the airflow barrier. This ensures that the extraction space always maintains a dry and clean gas environment, thereby preventing water vapor and coal dust from entering the labyrinth seal assembly and bearings in the coal mine, and thus effectively protecting the labyrinth seal assembly and bearings.

[0016] It is evident that the above technical solution can prevent water vapor and coal dust from entering the extraction space, ensuring a consistently dry and clean gas environment. This effectively isolates the labyrinth seal assembly from water vapor and coal dust in the coal mine. Even if gaps exist within the labyrinth seal assembly, there is no possibility of water vapor or coal dust entering these gaps or even the bearings. This eliminates the possibility of water vapor and coal dust accumulating in the gaps of the labyrinth seal assembly and entering the bearings through these gaps, as is common in existing technologies. This improves the sealing effect of the idler rollers, enhances their moisture and dust resistance, and prevents damage to the bearings and the rollers themselves caused by water vapor and coal dust entering through the gaps in the labyrinth seal assembly. Furthermore, it prevents water vapor and coal dust from accumulating in these gaps, thus avoiding interference with the normal operation of the labyrinth seal assembly. This also prevents the labyrinth seal assembly from experiencing high resistance during operation, or even jamming and being unable to rotate relative to each other. Consequently, it prevents the idler rollers from experiencing high rotational resistance and jamming, ensuring the stability of the idler rollers and the underground belt conveyor. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a turbine fan moisture-proof and dust-proof idler roller for an underground belt conveyor disclosed in an embodiment of this application;

[0018] Figure 2 for Figure 1 A cross-sectional view;

[0019] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0020] Figure 4 This is a schematic diagram of airflow during operation of a turbine fan moisture-proof and dust-proof idler roller for an underground belt conveyor disclosed in an embodiment of this application. In the figure, the arrows indicate the airflow direction, the first included angle indicates the angle between the exhaust direction of the turbine fan and the axial direction of the idler roller shaft, and the second included angle indicates the angle between the depth direction of the radial ventilation hole and the axial direction of the idler roller shaft.

[0021] Figure 5 This is a schematic diagram of the idler roller shaft disclosed in an embodiment of this application;

[0022] Figure 6 for Figure 5 A magnified schematic diagram of a portion of the image;

[0023] Figure 7 for Figure 6 A cross-sectional view;

[0024] Figure 8 This is a schematic diagram of a turbofan disclosed in an embodiment of this application;

[0025] Figure 9 This is a schematic diagram of the turbofan disclosed in an embodiment of this application from another perspective;

[0026] Figure 10 This is a schematic diagram of the end cap disclosed in an embodiment of this application.

[0027] Among them: roller shaft 100, axial vent hole 110, radial vent hole 120, airflow baffle 130, roller body 200, turbo fan 300, fan blade 310, outer shell 320, connecting hole 330, bearing assembly 400, bearing seat 410, bearing 420, labyrinth seal assembly 500, labyrinth seal 510, end cover 520, arc-shaped guide surface 521, and extraction space 600. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "end," "top," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please refer to Figures 1 to 10 This application discloses a turbine fan-driven moisture-proof and dust-proof idler roller for underground belt conveyors, comprising an idler roller shaft 100, a roller body 200, a turbine fan 300, a bearing assembly 400, and a labyrinth seal assembly 500, wherein:

[0032] The idler shaft 100 passes through the center of the roller body 200, meaning the roller body 200 surrounds the idler shaft 100. Both ends of the idler shaft 100 protrude from the ends of the roller body 200. Flat grooves are formed at both ends of the idler shaft 100, which are used to secure the idler shaft 100 to the mounting bracket of the idler, thus installing the idler onto the underground belt conveyor. During the operation of the idler (i.e., during the operation of the conveyor belt), the idler shaft 100 does not rotate because it is secured to the mounting bracket. The roller body 200 supports the conveyor belt; during the operation of the conveyor belt, friction causes the roller body 200 to rotate.

[0033] The turbofan 300 is fixedly mounted at the end of the roller body 200. Both ends of the idler shaft 100 pass through and protrude from the turbofan 300. The turbofan 300 is arranged around the periphery of the idler shaft 100, and the turbofan 300 is rotatably engaged with the idler shaft 100, meaning the turbofan 300 is positioned between the roller body 200 and the idler shaft 100. In this application, the turbofan 300 is a fan without its own drive unit. When the roller body 200 rotates, the roller body 200 drives the turbofan 300 to rotate; that is, the turbofan 300 in this application is driven by the roller body 200. Since the idler shaft 100 does not rotate during idler operation, while the turbofan 300 needs to rotate, the turbofan 300 needs to be rotatably engaged with the idler shaft 100, meaning the turbofan 300 and the idler shaft 100 are in a clearance fit. Since the turbofan 300 is fixedly installed at the end of the roller body 200, during the rotation of the turbofan 300, the turbofan 300 can fan the water vapor and coal powder at both ends of the roller body 200 to gradually move away, that is, the exhaust direction of the turbofan 300 is towards the direction away from both ends of the roller body 200.

[0034] Since the idler shaft 100 does not rotate, but the roller body 200 needs to rotate, a bearing assembly 400 is required for both static and dynamic engagement and to provide support. Specifically, the bearing assembly 400 includes a bearing assembly 400 and a bearing 420. The bearing 420 is housed within a bearing housing 410, which is fixedly located inside the roller body 200. The bearing housing 410 can rotate with the roller body 200. Because the idler shaft 100 does not rotate during idler operation, while the bearing housing 410 needs to rotate, the bearing housing 410 and the idler shaft 100 are in a rotational engagement, i.e., a clearance engagement. Bearing 420 is disposed between idler roller shaft 100 and bearing housing 410. The outer ring of bearing 420 contacts bearing housing 410 and is supported on the inner side of bearing housing 410. The inner ring of bearing 420 is sleeved on idler roller shaft 100. Bearing 420 supports bearing housing 410, thereby supporting roller body 200. During the operation of idler roller, the outer ring of bearing 420 rotates with bearing housing 410, while the inner ring of bearing 420 does not rotate with idler roller shaft 100. This achieves bearing engagement between idler roller shaft 100 and roller body 200. That is, the bearing assembly 400 achieves relative rotational engagement between idler roller shaft 100 and roller body 200, and also serves to support roller body 200.

[0035] The labyrinth seal assembly 500 is positioned between the idler roller shaft 100 and the bearing housing 410. The labyrinth seal assembly 500 generally includes two labyrinth sealing rings. One ring makes sealing contact with the inner side of the bearing housing 410 and rotates with the bearing housing 410. The other ring makes sealing contact with the outer circumferential surface of the idler roller shaft 100 and remains stationary with the idler roller shaft 100. The two labyrinth sealing rings are interlocked and rotate relative to each other (clearance fit). The specific structure of the labyrinth seal assembly 500 and the principle of its sealing are known technologies and will not be elaborated upon here for the sake of brevity. The labyrinth seal assembly 500 achieves a seal between the idler roller shaft 100 and the bearing housing 410. Furthermore, the labyrinth seal assembly 500 is located between the bearing 420 and the turbine fan 300 to prevent moisture and coal dust from entering the bearing 420 from the end of the roller body 200. Figure 3 In the design, on the left side of bearing 420, bearing housing 410 is fixedly installed inside roller body 200, and labyrinth seal assembly 500 is sealed between idler roller shaft 100 and bearing housing 410. Therefore, the left side of bearing 420 is fully sealed, effectively isolating water vapor and coal dust entering from the end of roller body 200. Since this structure is symmetrically arranged at both ends of the idler roller, a sealed closed space can be formed on the right side of bearing 420, free from the problems of water vapor and coal dust, so there is no need to consider the sealing situation on the right side of bearing 420.

[0036] The labyrinth seal assembly 500, bearing housing 410, idler roller shaft 100, and turbine fan 300 form an extraction space 600. The idler roller shaft 100 has an axial vent 110 connected to a dry, clean air source, and multiple radial vents 120 communicating with the axial vent 110. These radial vents 120 are arranged in a circumferential array along the idler roller shaft 100. The outlets of the radial vents 120 are located between the labyrinth seal assembly 500 and the turbine fan 300, allowing the radial vents 120 to communicate with the extraction space 600. In other words, one end of the axial vent 110 is connected to the dry, clean air source. One end is connected to a dry and clean gas source, and the other end is connected to multiple radial vent holes 120. All of the multiple radial vent holes 120 are connected to the extraction space 600. The dry and clean gas in the dry and clean gas source (which can be dry and clean air or dry and clean nitrogen, this application does not limit it) can be introduced into the extraction space 600 through the axial vent hole 110 and the radial vent hole 120. Then, the dry and clean gas entering the extraction space 600 is extracted by the turbo fan 300, so that the water vapor and coal dust entering the extraction space 600 are extracted by the turbo fan 300 along with the dry and clean gas.

[0037] Please refer to this again. Figure 4 In practical use, the idler roller 100 remains stationary (i.e., does not rotate), the conveyor belt drives the roller body 200 to rotate, and the roller body 200 drives the turbine fan 300 to rotate. During the rotation of the turbine fan 300, the turbine fan 300 draws gas from the extraction space 600, creating a negative pressure in the extraction space 600. This allows the dry and clean gas from the dry and clean gas source to be drawn into the extraction space 600 through the axial vent 110 and radial vent 120. The turbine fan 300 then blows out the dry and clean gas that has entered the extraction space 600, achieving the flow of the dry and clean gas. Figure 4 The middle arrow indicates that, in the process of the dry and clean gas flow, the dry and clean gas drawn out by the turbofan 300 is blown away from the end of the roller body 200, so as to fan the water vapor and coal powder at the end of the roller body 200 away from the end of the roller body 200, thereby blowing the water vapor and coal powder at the end of the roller body 200 away, preventing water vapor and coal powder from approaching and entering the exhaust space 600, thus preventing water vapor and coal powder from entering the exhaust space 600.

[0038] Furthermore, such as Figure 4As shown, there are two paths for water vapor and coal dust to enter the extraction space 600 from the end of the roller body 200. The first path is through the turbine fan 300, but when the turbine fan 300 rotates, it forms an outward airflow, so water vapor and coal dust cannot enter the extraction space 600 from the turbine fan 300. The second path is through the gap set by the rotational cooperation between the turbine fan 300 and the idler roller shaft 100. However, since the dry and clean gas drawn out by the turbine fan 300 blows the water vapor and coal dust from the end of the roller body 200 away, the possibility of water vapor and coal dust entering the extraction space 600 through the gap between the turbine fan 300 and the idler roller shaft 100 is small. Even if some water vapor and coal dust enter the extraction space 600 through the gap between the turbofan 300 and the idler roller shaft 100, the water vapor and coal dust entering the extraction space 600 will be drawn out by the turbofan 300 along with the dry and clean gas, preventing water vapor and coal dust from remaining in the extraction space 600 and ensuring that the extraction space 600 always maintains a dry and clean gas environment. At the same time, the dry and clean gas drawn out from the multiple radial vents 120 can form an airflow barrier, blocking the labyrinth seal assembly 500 on the side away from the bearing 420. Water vapor and coal dust have difficulty breaking through this airflow barrier and contacting the labyrinth seal assembly 500, let alone entering the labyrinth seal assembly 500 and the bearing 420.

[0039] In other words, even if some water vapor and coal dust enter the extraction space 600 through the gap between the turbine fan 300 and the idler roller shaft 100, the water vapor and coal dust are first isolated by the airflow barrier. It is difficult for water vapor and coal dust to break through the airflow barrier and come into contact with the labyrinth seal assembly 500, let alone enter the labyrinth seal assembly 500 and the bearing 420. Secondly, the airflow formed by the dry and clean gas will carry the water vapor and coal dust out of the extraction space 600 in the first instance, preventing water vapor and coal dust from staying in the extraction space 600 and breaking through the airflow barrier. This ensures that the extraction space 600 always maintains a dry and clean gas environment, thereby preventing water vapor and coal dust in the coal mine from entering the labyrinth seal assembly 500 and the bearing 420, and thus effectively protecting the labyrinth seal assembly 500 and the bearing 420.

[0040] In a moisture-proof and dust-proof idler roller for an underground belt conveyor disclosed in this application embodiment, the roller body 200 drives the turbine fan 300 to rotate. The turbine fan 300 draws gas from the extraction space 600, drawing dry and clean gas from a dry and clean gas source into the extraction space 600 through the axial ventilation hole 110 and the radial ventilation hole 120. The turbine fan 300 then blows out the dry and clean gas that has entered the extraction space 600, achieving the flow of dry and clean gas. Furthermore, the rotation of the turbine fan 300 does not require external drive; it is entirely driven by the rotation of the conveyor belt. The conveyor belt speed can reach 4m / s to 5m / s. Taking a roller body diameter d = 159mm as an example, the rotational speed of the roller body 200 reaches 400 rpm, so the turbine fan 300 has a strong suction force. First, during the flow of dry and clean gas, the dry and clean gas drawn out by the turbofan 300 is blown away from the end of the roller body 200, so as to fan the water vapor and coal powder at the end of the roller body 200 away from the end of the roller body 200, thereby blowing the water vapor and coal powder at the end of the roller body 200 away, preventing water vapor and coal powder from approaching or entering the exhaust space 600, thus preventing water vapor and coal powder from entering the exhaust space 600. Secondly, even if some water vapor and coal dust enter the extraction space 600 through the gap between the turbine fan 300 and the idler roller shaft 100, the water vapor and coal dust are isolated by the airflow barrier, making it difficult for them to break through the airflow barrier and come into contact with the labyrinth seal assembly 500, let alone enter the labyrinth seal assembly 500 and the bearing 420. Moreover, the airflow formed by the dry and clean gas immediately carries the water vapor and coal dust out of the extraction space 600, preventing them from staying in the extraction space 600 or breaking through the airflow barrier. This ensures that the extraction space 600 always maintains a dry and clean gas environment, thereby preventing water vapor and coal dust in the coal mine from entering the labyrinth seal assembly 500 and the bearing 420, thus effectively protecting the labyrinth seal assembly 500 and the bearing 420.

[0041] It is evident that the above-mentioned technical solution can prevent water vapor and coal dust from entering the extraction space 600, ensuring that the extraction space 600 always maintains a dry and clean gas environment. This effectively isolates water vapor and coal dust from entering the labyrinth sealing assembly 500 in the coal mine. Based on this, even if there are gaps in the labyrinth sealing assembly 500, there is no possibility of water vapor or coal dust entering the gaps, or even the bearing 420. It eliminates the possibility of water vapor and coal dust easily accumulating in the gaps of the labyrinth sealing assembly 500 and entering the bearing 420 through these gaps, as is common in existing technologies. The high sealing effect of the idler roller improves its moisture and dust resistance, preventing water vapor and coal dust from entering the bearing 420 through the gaps in the labyrinth seal assembly 500, thus preventing damage to the idler roller bearing and its scrapping. It also prevents water vapor and coal dust from accumulating in the gaps, thereby avoiding affecting the normal operation of the labyrinth seal assembly 500. It also prevents the labyrinth seal assembly 500 from experiencing high resistance during operation, or even jamming and being unable to rotate relative to each other. This prevents the idler roller from experiencing high rotational resistance and being prone to jamming, ensuring the stability of the idler roller and the underground belt conveyor.

[0042] Preferably, the labyrinth seal assembly 500 may include a labyrinth seal 510 and an end cap 520 that abut against each other for sealing. The labyrinth seal 510 is sealed between the idler roller shaft 100 and the bearing seat 410. The end cap 520 is sealed on the idler roller shaft 100 and rotates with the bearing seat 410. The labyrinth seal 510 is located between the bearing 420 and the end cap 520. The end cap 520 further isolates water vapor and coal dust, preventing water vapor and coal dust from approaching or entering the labyrinth seal 510. The side of the end cap 520 away from the labyrinth seal 510 has an arc-shaped guide surface 521. The outlet of the radial vent 120 is located between the arc-shaped guide surface 521 and the turbofan 300, and the guide direction of the arc-shaped guide surface 521 points towards the turbofan 300. The arc-shaped guide surface 521 enables the dry and clean gas to form a stable airflow path and guides the airflow to the turbofan 300. This avoids the formation of turbulence in the extraction space 600, which could cause water vapor and coal dust to remain in the extraction space 600. It also prevents turbulence in the extraction space 600 from damaging the airflow barrier and makes it easier for water vapor and coal dust to break through the airflow barrier. This ensures that water vapor and coal dust are carried out of the extraction space 600 as soon as possible, preventing water vapor and coal dust from remaining in the extraction space 600 and breaking through the airflow barrier. This further ensures that the extraction space 600 always maintains a dry and clean gas environment.

[0043] Furthermore, the turbofan 300 may include a fixedly connected fan blade 310 and a housing 320. The housing 320 is fixedly connected to the roller body 200, and the bearing seat 410 is in contact with the housing 320. The housing 320 has a connecting hole 330 that communicates with the extraction space 600, so that the outside of the turbofan 300 can draw gas from the extraction space 600 through the connecting hole 330. The turbofan 300 draws gas from the extraction space 600 through the connecting hole 330, which is used for airflow. The arc-shaped guide surface 521 One end extends to the connecting hole 330 and is fitted with the fan blade 310 with a clearance to form a longer flow path. The dry and clean gas drawn out from the multiple radial vent holes 120 is directly guided to the fan blade 310. This avoids the possibility of the dry and clean gas deviating from the airflow path during the process of flowing from the outlet of the radial vent hole 120 to the fan blade 310. It also prevents the dry and clean gas that deviates from the airflow path from carrying water vapor and coal dust into the labyrinth seal 510 through the gap between the end cover 520 and the bearing seat 410. Conversely, even if there is a gap between the end cap 520 and the bearing seat 410, because one end of the arc-shaped guide surface 521 extends to the connecting hole 330 and fits with the fan blade 310, the dry and clean gas carrying water vapor and coal dust is directly guided to a position closer to the fan blade 310, and can be directly sucked out by the fan blade 310, preventing it from drifting and partially entering the labyrinth seal 510 through the gap between the end cap 520 and the bearing seat 410. At the same time, because one end of the arc-shaped guide surface 521 extends to the connecting hole 330, it can block the gap between the outer shell 320 and the bearing seat 410, blocking the path for water vapor and coal dust to enter the gap between the outer shell 320 and the bearing seat 410, preventing water vapor and coal dust from accumulating in the gap and easily causing moisture and dust prevention failure, thereby further isolating water vapor and coal dust, further preventing water vapor and coal dust from entering the labyrinth seal assembly 500, improving the sealing effect of the idler roller, and improving the moisture and dust prevention capability of the idler roller.

[0044] As described above, the dry, clean gas drawn out by the turbofan 300 is blown away from the end of the roller 200, thus fanning the water vapor and coal dust at the end of the roller 200 away from it. This prevents the water vapor and coal dust from approaching or entering the extraction space 600. Preferably, the angle between the exhaust direction of the turbofan 300 and the axial direction of the idler roller shaft 100 is 10° to 45°. Please refer again. Figure 4 , Figure 4 The first included angle represents the angle between the exhaust direction of the turbofan 300 and the axial direction of the idler roller shaft. The horizontal side of the first included angle represents the axial direction of the idler roller shaft 100, and the other side represents the exhaust direction of the turbofan 300, indicated by an arrow. Figure 4The first included angle is 10° to 45°, so that the dry and clean gas drawn out by the turbofan 300 is blown out at an angle toward the idler roller shaft 100. This can specifically blow away the water vapor and coal dust near the gap between the turbofan 300 and the idler roller shaft 100, preventing water vapor and coal dust from approaching the gap and further preventing water vapor and coal dust from entering the exhaust space 600 through the gap.

[0045] Preferably, the idler roller shaft 100 may be circumferentially equipped with an airflow baffle 130. The airflow baffle 130 is located between the radial vent 120 and the labyrinth seal assembly 500. The airflow baffle 130 blocks the flow of dry, clean gas drawn out from the radial vent 120 to the sealing contact point between the idler roller shaft 100 and the labyrinth seal assembly 500, preventing moisture and coal dust from being carried to the sealing contact point and entering the labyrinth seal assembly 500. This further improves the sealing effect of the idler roller and enhances its moisture and dust resistance. For ease of installation, maintenance, and replacement, the airflow baffle 130 and the idler roller shaft 100 can be detachably connected, specifically by snap-fit ​​or threaded connection. This configuration is clearly achievable for those skilled in the art.

[0046] As mentioned above, the axial vent 110 is connected to multiple radial vents 120. That is, the axial vent 110 is the main air supply port, needing to supply air to the multiple radial vents 120. To avoid insufficient air supply, optionally, the radius of the axial vent 110 is 'a', the radius of the radial vents 120 is 'b', and the number is N, satisfying the following: Assuming the airflow rate is the same in both the axial vent 110 and the radial vent 120, and both are M, the air supply is proportional to the cross-sectional area, meaning that N radial vents 120 require M*N*π*b. 2 The air supply capacity of the axial vent 110 is M*π*a. 2 The air supply capacity of the axial vent 110 is greater than or equal to the air supply capacity required by N radial vents 120, which can be obtained through formula derivation and simplification. Furthermore, this condition is derived under the premise that the airflow rates in the axial vent 110 and the radial vent 120 are the same. Under normal circumstances, the airflow rate in the axial vent 110 is much greater than that in the radial vent 120. Therefore, under this condition, the air supply can only be more, and there will be no shortage. This can avoid the sealing effect of the idler roller due to insufficient air supply, thereby effectively ensuring the sealing effect of the idler roller and further improving the moisture-proof and dust-proof capabilities of the idler roller.

[0047] In this application, the dry, clean gas drawn from multiple radial vents 120 forms an airflow barrier, blocking the labyrinth seal assembly 500 on the side away from the bearing 420. Furthermore, the outlets of the radial vents 120 are elongated and extend circumferentially along the idler roller shaft 100, allowing the dry, clean gas drawn from the radial vents 120 to form a flat, emitted airflow. Because the multiple radial vents 120 are arranged in a circumferential array along the idler roller shaft 100, the flat, emitted airflows drawn from adjacent radial vents 120 intersect. This forms an integral airflow barrier curtain in the circumference of the idler roller shaft 100, blocking the labyrinth seal assembly 500 on the side away from the bearing 420. This ensures a higher isolation strength between the airflow barriers formed by adjacent radial vents 120, preventing weak points where water vapor and coal dust can easily penetrate due to poor barrier strength between adjacent radial vents 120. This improves the barrier effect of the airflow barrier, making it more difficult for water vapor and coal dust to penetrate the airflow barrier and contact the labyrinth seal assembly 500, further reducing the possibility of water vapor and coal dust entering the labyrinth seal assembly 500 and the bearing 420.

[0048] Preferably, the angle between the depth direction of the radial vent 120 and the axial direction of the idler roller shaft 100 is 60° to 80°. Please refer again. Figure 4 , Figure 4 The second included angle represents the angle between the depth direction of the radial vent 120 and the axial direction of the idler roller shaft 100. The horizontal side of the second included angle represents the axial direction of the idler roller shaft 100, and the other side represents the depth direction of the radial vent 120, which is the direction of airflow. The air outlet direction is indicated by an arrow. Figure 4 The second included angle is 60° to 80°, so that the dry and clean gas flows directly inclined toward the turbofan 300, preventing water vapor and coal dust from approaching and flowing toward the labyrinth seal assembly 500, further reducing the possibility of water vapor and coal dust entering the labyrinth seal assembly 500 and the bearing 420, improving the sealing effect of the idler roller, and improving the moisture-proof and dust-proof capabilities of the idler roller.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A turbine fan-driven moisture-proof and dust-proof idler roller for underground belt conveyors, characterized in that... The assembly includes an idler shaft (100), a roller body (200), a turbofan (300), a bearing assembly (400), and a labyrinth seal assembly (500). The turbofan (300) is fixedly disposed at the end of the roller body (200). The bearing housing (410) of the bearing assembly (400) is fixedly disposed inside the roller body (200). The idler shaft (100) passes through the center of the roller body (200). Both the bearing housing (410) and the turbofan (300) are rotatably engaged with the idler shaft (100). The bearing (420) of the bearing assembly (400) is disposed between the idler shaft (100) and the bearing housing (410). The labyrinth seal assembly (500) is sealed between the idler roller shaft (100) and the bearing housing (410), and is located between the bearing (420) and the turbine fan (300). The labyrinth seal assembly (500), the bearing housing (410), the idler roller shaft (100) and the turbine fan (300) form an exhaust space (600). The end of the idler roller shaft (100) is provided with an axial vent (110) connected to a dry and clean air source and a plurality of radial vents (120) communicating with the axial vent (110). The radial vents (120) are communicating with the exhaust space (600). The labyrinth sealing assembly (500) includes a labyrinth seal (510) and an end cap (520) that abut against each other for sealing. The labyrinth seal (510) is sealed between the idler roller shaft (100) and the bearing seat (410). The end cap (520) is sealed on the idler roller shaft (100) and rotates with the bearing seat (410). The labyrinth seal (510) is located between the bearing (420) and the end cap (520). The side of the end cap (520) away from the labyrinth seal (510) has an arc-shaped guide surface (521). The outlet of the radial vent (120) is located between the arc-shaped guide surface (521) and the turbofan (300), and the guide direction of the arc-shaped guide surface (521) points towards the turbofan (300).

2. The turbine fan moisture-proof and dust-proof idler roller for underground belt conveyors according to claim 1, characterized in that, The turbofan (300) includes a fixedly connected blade (310) and a housing (320). The housing (320) is fixedly connected to the roller body (200), and the bearing seat (410) is in contact with the housing (320). The housing (320) has a connecting hole (330) communicating with the exhaust space (600). One end of the arc-shaped guide surface (521) extends to the connecting hole (330) and is clearance-fitted with the blade (310).

3. The turbine fan moisture-proof and dust-proof idler roller for an underground belt conveyor according to claim 1, characterized in that, The angle between the exhaust direction of the turbofan (300) and the axial direction of the idler roller shaft (100) is 10° to 45°.

4. The turbine fan moisture-proof and dust-proof idler roller for an underground belt conveyor according to claim 1, characterized in that, The idler roller shaft (100) is provided with an airflow baffle (130), which is located between the radial vent (120) and the labyrinth seal assembly (500).

5. A turbine fan-driven moisture-proof and dust-proof idler roller for an underground belt conveyor according to claim 1, characterized in that, The radius of the axial vent (110) is a, the radius of the radial vent (120) is b, and the number is N, which satisfies the condition.

6. The turbine fan moisture-proof and dust-proof idler roller for an underground belt conveyor according to claim 1, characterized in that, The outlet of the radial vent (120) is elongated and extends along the circumference of the idler roller shaft (100).

7. A turbine fan-driven moisture-proof and dust-proof idler roller for an underground belt conveyor according to claim 1, characterized in that, The angle between the depth direction of the radial vent (120) and the axial direction of the idler roller shaft (100) is 60° to 80°.

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