Bearing seat for coal mining machine

Abstract

The invention discloses a bearing seat for a coal mining machine in the technical field of coal mining machinery, which comprises a seat body, the inner ring of the seat body is provided with a space for accommodating a bearing, the inner ring of the bearing is connected with a rotating shaft, the bearing seat also comprises a sealing structure, the sealing structure comprises a static sealing ring and a dynamic sealing ring, the static sealing ring is fixed on the side surface of the seat body, the dynamic sealing ring is fixed on a transmission shaft, and the sealing structure is connected with the rotating shaft. The attached face of the static sealing ring and the movable sealing ring is of a labyrinth sealing structure. The dust removal structure comprises a plurality of permanent magnet rings arranged on the periphery of the movable sealing ring in a sleeving mode, magnetic poles on the outer side faces of the permanent magnet rings are arranged at different intervals, an air bag structure is fixed to the side face of the base and provided with permanent magnet pieces and air bags, the permanent magnet pieces and the air bags are located on the peripheries of the permanent magnet rings, and an air outlet end opening of each air bag communicates with a dust removal part located on the base; external dust, water vapor and corrosive microparticles can be effectively prevented from entering the seat body; impurities attached to the ash removal part can be removed, cleanliness of the ash removal part is guaranteed, and the risk of faults of the bearing seat and the coal mining machine is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of coal mining machinery, and in particular to a bearing housing for a coal mining machine. Background Technology

[0002] Slewing bearing housings are large and extra-large bearing housings with special construction that can withstand comprehensive loads. They are characterized by compact structure, sensitive rotation, and convenient installation and maintenance. Due to the special working environment of coal mining machines, the bearings need to prevent the ingress of external impurities such as dust and moisture to ensure normal operation. Currently, the sealing mechanisms of bearing housings used in coal mining machines are relatively simple and cannot effectively prevent dust from entering the bearings.

[0003] Existing technology, such as Chinese Patent Publication No. CN210565815U, describes a bearing seat for a coal mining machine, including a base. The outer top wall of the base has an arc-shaped groove, and a lower semi-circular fixing ring is fixed to the inner wall of the arc-shaped groove. An upper semi-circular fixing ring is fixed to the lower semi-circular fixing ring by bolts. The same bearing is fixed to the middle of the inner wall of the upper and lower semi-circular fixing rings on opposite sides. A drive shaft is fixed to the inner ring of the bearing. Semi-circular ash-blocking plates are fixed to both sides of the top outer wall of the upper semi-circular fixing ring and both sides of the bottom outer wall of the lower semi-circular fixing ring. Semi-circular mounting plates are fixed to the outer walls of the four semi-circular ash-blocking plates near the drive shaft. This invention effectively blocks most of the dust from falling onto the four semi-circular ash-collecting plates. Dust between the semi-circular ash-collecting plates and the drive shaft is blocked. Some dust that falls into the bearing through the gap between the semi-circular ash-collecting plates and the drive shaft is absorbed by the dust-collecting plates, maximizing the blocking of coal ash.

[0004] The bearing housing for the coal mining machine described in the aforementioned patent document has a defect: because the dust collection plate and the shaft are in rolling contact, dust can easily enter the bearing housing from the gap between the dust collection plate and the shaft. Moreover, due to the special nature of the working environment of the coal mining machine, debris can easily adhere to the surface near the gap. If it is not cleaned in time, it will increase the risk of failure of the bearing housing and the coal mining machine. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the invention, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] Therefore, the purpose of this invention is to provide a bearing housing for a coal mining machine. A static and dynamic sealing ring are rotatably connected to allow the drive shaft to rotate within the housing. A labyrinth seal structure effectively prevents external dust, moisture, and corrosive microparticles from entering the housing. Based on magnetic principles, the rotating drive shaft continuously expands and compresses the air chamber. The gas discharged from the outlet port cleans the cleaning section, removing attached debris and ensuring its cleanliness, thus reducing the risk of bearing housing and coal mining machine malfunctions.

[0007] To solve the above-mentioned technical problems, the present invention provides a bearing housing for a coal mining machine, adopting the following technical solution: It includes a housing body, the inner ring of which has a space for accommodating a bearing, the inner ring of which is connected to a rotating shaft; it also includes: a sealing structure, comprising a static sealing ring and a dynamic sealing ring, the static sealing ring being fixed to the side of the housing body, the dynamic sealing ring being fixed to the transmission shaft, and the mating surface of the static sealing ring and the dynamic sealing ring being a labyrinth seal structure; and a dust removal structure, including multiple permanent magnet rings sleeved on the outer periphery of the dynamic sealing ring, the magnetic poles of the multiple permanent magnet rings being spaced differently on their outer surfaces; an airbag structure fixed to the side of the housing body, the airbag structure having a permanent magnet plate and an airbag located on the outer periphery of the permanent magnet rings, the air outlet of the airbag being connected to a dust removal section located on the housing body.

[0008] Optionally, the static sealing ring includes a first sealing part located inside the seat body, and the outer periphery of the first sealing part is bent to fit against the side of the seat body. The dynamic sealing ring includes a second sealing part, and the middle part of the second sealing part is provided with a second sealing part that fits against the first sealing part.

[0009] Optionally, the labyrinth sealing structure consists of multiple layers of first convex rings arranged from the inside to the outside on the surface of the first sealing part, and a second convex ring arranged from the inside to the outside on the surface of the second sealing part, which is interleaved with the multiple layers of first convex rings.

[0010] Optionally, the inner ring of the second sealing part has a groove, in which a circular sealing ring is embedded. The top of the second sealing part facing the first sealing part has a V-shaped sealing ring, and the two sides of the V-shaped sealing ring abut against the inner surfaces of the second sealing part and the first sealing part, respectively.

[0011] Optionally, a retaining ring is provided on the outer periphery of the side of the second sealing part away from the first sealing part, and the two permanent magnet rings are symmetrically embedded in the inner sides of the retaining ring. The surface of the permanent magnet ring is provided with a plurality of first fixing bolts, which pass through the permanent magnet ring and the second sealing part and fix them to the surface of the drive shaft.

[0012] Optionally, the airbag structure is fixed to the side of the seat body by a pressure plate member. The pressure plate member includes a U-shaped fixing ring. The horizontal part of the fixing ring abuts against the circumferential surface of the first sealing part, and the vertical part of the fixing ring abuts against the side of the first sealing part. The surface of the fixing ring is provided with a plurality of second fixing bolts. The second fixing bolts pass through the fixing ring and the first sealing part and are fixed to the side of the seat body.

[0013] Optionally, the airbag structure is provided in two sets, and the two sets of airbag structures are symmetrically fixed on both sides of the seat.

[0014] Optionally, the airbag structure includes a fixing block horizontally fixed to a fixing ring, a limiting cylinder fixed to the bottom of the fixing block, a sliding plate slidably connected inside the limiting cylinder, a permanent magnet fixed to the bottom of the sliding plate, the bottom of the airbag fixed to the sliding plate, and an air inlet port and an air outlet port connected to the top of the limiting cylinder, both of which are equipped with one-way valves.

[0015] Optionally, the airbag structure includes a fixing block horizontally fixed to a fixing ring, a limiting cylinder fixed to the bottom of the fixing block, a sliding plate slidably connected inside the limiting cylinder, a permanent magnet fixed to the bottom of the sliding plate, the bottom of the airbag fixed to the sliding plate, and an air inlet port and an air outlet port connected to the top of the limiting cylinder, both of which are equipped with one-way valves.

[0016] Optionally, the seat body is composed of a lower semicircular fixing seat and an upper semicircular fixing seat. The lower semicircular fixing seat and the upper semicircular fixing seat are provided with mutually fixed lower end faces and upper end faces on both sides. A sealing gasket is connected between the lower end face and the upper end face. An oil inlet plug is provided on the upper semicircular fixing ring.

[0017] In summary, the present invention has at least one of the following beneficial effects:

[0018] 1. The present invention uses a static sealing ring and a dynamic sealing ring to rotate and connect, so that the drive shaft rotates in the seat body. The labyrinth sealing structure can effectively prevent external dust, water vapor and corrosive microparticles from entering the seat body.

[0019] 2. This invention uses an airbag structure, a permanent magnet ring, and a permanent magnet sheet. Based on the principle of magnetism, when the transmission shaft works and rotates, it repeatedly expands and compresses the airbag. The gas discharged from the air outlet can clean the ash removal part, remove the debris attached to the ash removal part, ensure the cleanliness of the ash removal part, reduce the risk of bearing seat and coal mining machine failure, and ensure that the bearing seat and coal mining machine can operate normally.

[0020] 3. The present invention uses a fixed ring, a circular sealing ring, and a V-shaped sealing ring to further seal the connection gap between the second sealing part and the drive shaft, the labyrinth sealing structure between the second sealing part and the first sealing part, and the connection gap between the first sealing part and the seat body, so as to prevent dust from entering the seat body. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the front view structure of the present invention;

[0024] Figure 3 For the present invention Figure 1 A schematic diagram of the internal partial structure;

[0025] Figure 4 For the present invention Figure 3 A magnified structural diagram of part A;

[0026] Figure 5 For the present invention Figure 3 A schematic diagram of the enlarged structure of part B;

[0027] Figure 6 This is a schematic diagram of the airbag structure of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Base; 101. Lower semi-circular fixed base; 102. Upper semi-circular fixed base; 103. Sealing gasket; 2. Bearing; 3. Drive shaft; 4. Static sealing ring; 401. First sealing part; 402. First sealing part; 403. First convex ring; 5. Dynamic sealing ring; 501. Second sealing part; 502. Second sealing part; 503. Second convex ring; 6. Permanent magnet ring; 7. Airbag structure; 701. Fixing block; 702. Limiting cylinder; 703. Slide plate; 704. Permanent magnet sheet; 705. Airbag; 706. Air inlet port; 707. Air outlet port; 8. Circular sealing ring; 9. V-shaped sealing ring; 10. Retaining ring; 11. First fixing bolt; 12. Fixing ring; 1201. Air distribution channel; 1202. Air inlet port; 1203. Air blowing port; 13. Second fixing bolt; 14. Oil inlet plug. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Example 1

[0033] Reference Figures 1-3 This invention discloses a bearing housing for a coal mining machine, comprising a housing body 1, an inner ring of the housing body 1 having a space for accommodating a bearing 2, an annular groove for positioning the connected bearing 2 on the inner wall of the housing body 1, and a drive shaft 3 connected to the inner ring of the bearing 2.

[0034] The base 1 can be either a single piece or a split piece, see reference. Figure 2In this embodiment, the seat 1 is a split type, specifically composed of a lower semi-circular fixing seat 101 and an upper semi-circular fixing seat 102. When installing the bearing 2, the lower semi-circular fixing seat 101 and the upper semi-circular fixing seat 102 are separated, the bearing 2 is positioned inside the lower semi-circular fixing seat 101, and then the upper semi-circular fixing seat 102 is closed and locked. In this embodiment, in order to ensure the stability and sealing of the connection between the lower semi-circular fixing seat 101 and the upper semi-circular fixing seat 102, the lower semi-circular fixing seat 101 and the upper semi-circular fixing seat 102 are provided with mutually fixed lower end faces and upper end faces on both sides. A sealing gasket 103 is connected between the lower end face and the upper end face. The sealing gasket 103 can be a gasket with the same shape as the end face. The gasket has through holes for locking the bolts of the lower semi-circular fixing seat 101 and the upper semi-circular fixing seat 102. The upper semi-circular fixing ring 12 is provided with an oil inlet plug 14 for injecting lubricating oil to lubricate the bearing 2 inside the bearing seat, so as to ensure the normal use of the bearing 2.

[0035] Reference Figure 3 It also includes: a sealing structure, including a static sealing ring 4 and a dynamic sealing ring 5. The static sealing ring 4 is fixed to the side of the seat 1, and the dynamic sealing ring 5 is fixed to the drive shaft. The mating surface of the static sealing ring 4 and the dynamic sealing ring 5 is a labyrinth seal structure. The drive shaft 3 rotates inside the seat 1 by rotating the static sealing ring 4 and the dynamic sealing ring 5. The labyrinth seal structure can effectively prevent external dust, water vapor and corrosive microparticles from entering the seat 1.

[0036] Reference Figure 3 and Figure 6The dust removal structure includes multiple permanent magnet rings 6 sleeved around the outer periphery of the dynamic sealing ring 5. The magnetic poles of the multiple permanent magnet rings 6 are arranged at different intervals on their outer surfaces. An airbag structure 7 is fixed to the side of the base 1. The airbag structure 7 has a permanent magnet plate 704 and an airbag 705 located around the outer periphery of the permanent magnet rings 6. In this embodiment, the permanent magnet rings 6 are arranged in two sets symmetrically on both sides of the outer periphery of the dynamic sealing ring 5. The outer surface of one permanent magnet ring 6 is the N pole, and the outer surface of the other permanent magnet ring 6 is the S pole. The side of the permanent magnet plate 704 facing the dynamic sealing ring 5 can be either N pole facing outward or S pole facing outward. The permanent magnet rings 6 and the permanent magnet plate 704 are arranged in two sets symmetrically on both sides of the outer periphery of the dynamic sealing ring 5. 4. Based on the principle of magnetism, when the magnetic poles of the permanent magnet ring 6 and the permanent magnet sheet 704 are opposite magnetic poles, they are attracted to each other. When the magnetic poles of the permanent magnet ring 6 and the permanent magnet sheet 704 are the same magnetic poles, they are repulsive. For example, the side of the permanent magnet sheet 704 facing the dynamic sealing ring 5 can have the N pole facing outward. When the S pole of the permanent magnet ring 6 is opposite to the N pole of the N-pole of the N-pole-facing permanent magnet sheet 704, they are attracted to each other. When the N pole of the permanent magnet ring 6 is opposite to the N pole of the N-pole-facing permanent magnet sheet 704, they are repulsive. By employing the magnetic principle of permanent magnet ring 6 and permanent magnet sheet 704, the airbag 705 inside the airbag structure 7 can be driven to expand and compress when the transmission shaft 3 is working, thereby realizing the air intake and exhaust actions of the airbag 705 inside the airbag structure 7. The air outlet port 707 of the airbag 705 is connected to the dust cleaning part located on the seat 1. The dust cleaning part can be selected according to the required dust cleaning position. It is only necessary to pull and fix the air outlet port 707 of the airbag 705 to the dust cleaning position.

[0037] Reference Figure 4In detail, in this embodiment, the static sealing ring 4 includes a first sealing part 401 located inside the seat body 1. The outer periphery of the first sealing part 401 is bent to fit against the side of the seat body 1. The first sealing part 401 and the first sealing part 402 are integrally formed. The first sealing part 401 is mainly used to connect with the dynamic sealing ring 5. The first sealing part 402 is mainly used to fix the static sealing ring 4 on the seat body 1. The dynamic sealing ring 5 includes a second sealing part 501. The middle part of the second sealing part 501 is provided with a second sealing part 502 that fits against the first sealing part 402. The second sealing part 501 and the second sealing part 502 are integrally formed. The second sealing part 501 is mainly used to connect with the drive shaft 3. The second sealing part 502 is mainly used to connect with the static sealing ring 4. The labyrinth sealing structure consists of multiple layers of first convex rings 403 arranged from the inside out on the surface of the first sealing part 401, and second convex rings 503 arranged from the inside out on the surface of the second sealing part 502, which are interleaved with the multiple layers of first convex rings 403. By having the first convex rings 403 embedded in the grooves between the second convex rings 503, and the second convex rings 503 embedded in the grooves between the first convex rings 403, it is possible to ensure that while the second sealing part 502 rotates on the side of the first sealing part 401, it increases the difficulty for dust to enter the seat body 1.

[0038] Reference Figure 1 and Figure 4 In detail, in this embodiment, a retaining ring 10 is provided on the outer periphery of the side of the second sealing part 501 away from the first sealing part 401. The retaining ring 10 is integrally formed with the second sealing part 501, just like the second sealing part 502. The cross-section of the retaining ring 101 adopts the shape of an I-beam. The side groove of the retaining ring 101 is used to install the permanent magnet ring 6. The two permanent magnet rings 6 are symmetrically embedded in the two side grooves inside the retaining ring 10. The surface of the permanent magnet ring 6 is provided with a plurality of first fixing bolts 11. The first fixing bolts 11 pass through the permanent magnet ring 6 and the surface of the second sealing part 501 and the transmission shaft 3 for fixing. The second sealing part 501 and the transmission shaft 3 can be fixedly connected by the first fixing bolts 11, thereby fixing the dynamic sealing ring 5 on the transmission shaft 3, so that the dynamic sealing ring 5 can rotate with the rotation of the transmission shaft 3. At the same time, the first fixing bolts 11 can also fix the permanent magnet ring 6 on the retaining ring 101, that is, the permanent magnet ring 6 will rotate with the rotation of the transmission shaft 3.

[0039] Reference Figures 1-5In detail, in this embodiment, the airbag structure 7 is fixed to the side of the seat body 1 by a pressure plate member. The pressure plate member includes a U-shaped fixing ring 12. The horizontal part of the fixing ring 12 abuts against the circumferential surface of the first sealing part 402, and the vertical part of the fixing ring 12 abuts against the side of the first sealing part 402. The surface of the fixing ring 12 is provided with a plurality of second fixing bolts 13. The second fixing bolts 13 pass through the fixing ring 12 and the first sealing part 402 and are fixed to the side of the seat body 1. The first sealing part 402 can be fixedly connected to the side of the seat body 1 by the second fixing bolts 13, thereby fixing the static sealing ring 4 to the side of the seat body 1. At the same time, the second fixing bolts 13 can also fix the fixing ring 12 to the side of the seat body 1. The fixing ring 12 can press the outer periphery of the static sealing ring 4, further reducing the gap between the static sealing ring 4 and the side of the seat body 1, allowing it to enter the seat body 1.

[0040] Reference Figure 6 In detail, in this embodiment, the airbag structure 7 includes a fixing block 701 horizontally fixed to the fixing ring 12, a limiting cylinder 702 fixed at the bottom of the fixing block 701, a sliding plate 703 slidably connected inside the limiting cylinder 702, a permanent magnet plate 704 fixed at the bottom of the sliding plate 703, the bottom of the airbag 705 fixed on the sliding plate 703, and an air inlet port 706 and an air outlet port 707 connected to the top of the limiting cylinder 702. Both the air inlet port 706 and the air outlet port 707 are equipped with one-way valves.

[0041] When the drive shaft 3 is working, it drives the permanent magnet ring 6 on the dynamic seal ring 5 to rotate around the drive shaft 3 as the central axis. Based on the principle of magnetism, when the magnetic poles of the permanent magnet ring 6 and the permanent magnet plate 704 are opposite each other, they are like magnets, that is, there is a repulsive force. Therefore, the permanent magnet plate 704 drives the sliding plate 703 to compress the airbag 705 under the guidance of the limiting cylinder 702. While the airbag 705 is being compressed, the gas inside the airbag 705 is discharged through the air outlet 707 to remove dust from the bearing seat. When the magnetic poles of the permanent magnet ring 6 and the permanent magnet plate 704 are opposite each other, that is, there is an attractive force. The permanent magnet plate 704 is attracted by the permanent magnet ring 6. The air is drawn away from the airbag 705 by the suction force, and the airbag 705 is stretched and expanded. Outside air enters the airbag 705 through the air inlet port 706. When the drive shaft 3 works and rotates, it repeatedly expands and compresses the airbag 705, thereby realizing the air intake and exhaust action of the airbag 705 in the airbag structure 7. The air outlet port 707 of the airbag 705 is connected to the dust removal part located on the seat 1. The gas discharged from the air outlet port 707 can clean the dust removal part, remove the debris attached to the dust removal part, ensure the cleanliness of the dust removal part, reduce the risk of bearing seat and coal mining machine failure, and ensure that the bearing seat and coal mining machine can operate normally.

[0042] Working principle:

[0043] During installation, first separate the lower semicircular fixing seat 101 and the upper semicircular fixing seat 102, position the bearing 2 inside the lower semicircular fixing seat 101, and then cover and lock the upper semicircular fixing seat 102; then embed and connect the dynamic sealing ring 5 to the position corresponding to the static sealing ring 4, put the static sealing ring 4 and the dynamic sealing ring 5 on the drive shaft 3, embed the static sealing ring 4 into the side of the seat body 1, embed multiple permanent magnet rings 6 into the dynamic sealing ring 5 according to the installation position of the drive shaft 3 and fix them by the second fixing bolt 13, press the fixing ring 12 outside the static sealing ring 4 and fix it in the mounting hole on the side of the seat body 1 by the first fixing bolt 11;

[0044] During operation, the static sealing ring 4 and the dynamic sealing ring 5 are rotatably connected, causing the drive shaft 3 to rotate within the housing 1. The labyrinth seal structure effectively prevents external dust, moisture, and corrosive microparticles from entering the housing 1. As the drive shaft 3 rotates, the permanent magnet ring 6 on the dynamic sealing ring 5 rotates around the drive shaft 3 as its central axis. Based on the principle of magnetism, when the magnetic poles of the permanent magnet ring 6 and the permanent magnet plate 704 are of the same polarity and face each other, they exhibit repulsive force. When the magnetic poles of the permanent magnet ring 6 and the permanent magnet plate 704 are of different polarities and face each other, they exhibit repulsive force. The magnetic field is opposite, meaning there is an attractive force. When the drive shaft 3 rotates, it repeatedly expands and compresses the airbag 705, thereby realizing the intake and exhaust of the airbag 705 in the airbag structure 7. The air outlet port 707 of the airbag 705 is connected to the dust removal part located on the seat 1. The gas discharged from the air outlet port 707 can clean the dust removal part, remove the debris attached to the dust removal part, ensure the cleanliness of the dust removal part, reduce the risk of bearing seat and coal mining machine failure, and ensure that the bearing seat and coal mining machine can operate normally.

[0045] Example 2

[0046] Reference Figure 4Based on the same concept as in Embodiment 1 above, the bearing housing for a coal mining machine further includes a groove in the inner ring of the second sealing part 501, in which a circular sealing ring 8 is embedded. A V-shaped sealing ring 9 is provided on the top of the side of the second sealing part 501 facing the first sealing part 401, and the two sides of the V-shaped sealing ring 9 abut against the inner surfaces of the second sealing part 502 and the first sealing part 401, respectively. The circular sealing ring 8 is used to seal the second sealing part 501 and the drive shaft 3, preventing dust from entering the seat body 1 through the connection gap between the second sealing part 501 and the drive shaft 3. The V-shaped sealing ring 9 is used to seal the second sealing part 502 and the first sealing part 401, as well as the first sealing part 401 and the seat body 1, preventing dust from entering the seat body 1 through the labyrinth sealing structure between the second sealing part 502 and the first sealing part 401, and preventing dust from entering the seat body 1 through the connection gap between the first sealing part 401 and the seat body 1. When installing the circular sealing ring 8 and the V-shaped sealing ring 9, the first sealing part 401 should first be connected to the side of the seat body 1, then the circular sealing ring 8 and the V-shaped sealing ring 9 should be embedded into the second sealing part 501, and then the second sealing part 501 and the first sealing part 401 should be pressed together to ensure that all surfaces are in contact.

[0047] Example 3

[0048] Reference Figure 3 Based on the same concept as in Embodiment 1, this bearing housing for a coal mining machine also includes two sets of airbag structures 7, which are symmetrically fixed on both sides of the housing 1. If only one airbag structure 7 is installed, the airbag 705 will expand and compress during the rotation of the drive shaft 3 via the permanent magnet ring 6 and the permanent magnet plate 704, resulting in a pause in the air blowing dust removal process. However, this embodiment uses two sets of airbag structures 7, which enables continuous air blowing dust removal of the bearing housing. Furthermore, the air outlet 707 allows for comprehensive air blowing dust removal of the outer periphery of the bearing housing 1.

[0049] Example 4

[0050] Reference Figure 5The dust removal section of the bearing housing for a coal mining machine includes an air distribution channel 1201 opened within a fixed ring 12. The top of the fixed ring 12 is provided with an air inlet port 1202 connected to an air outlet port 707 via a pipe. Multiple air blowing ports 1203, communicating with the air distribution channel 1201, are evenly distributed on the inner surface of the fixed ring 12. The air blowing ports 1203 face outwards from the contact surface between the static sealing ring 4 and the dynamic sealing ring 5. As can be seen from Embodiment 2, dust can easily pass through the connection gap between the second sealing part 501 and the drive shaft 3, the labyrinth seal structure between the second sealing part 502 and the first sealing part 401, and the connection gap between the first sealing part 401 and the housing 1. The gap enters into the seat 1. In this embodiment, the position of the cleaning part is set at the outer periphery of the labyrinth sealing structure between the second sealing part 502 and the first sealing part 401. A fixing ring 12 with an air distribution channel 1201, an air inlet port 1202 and an air blowing port 1203 is used. Of course, the gas discharged from the air outlet port 707 enters the air distribution channel 1201 through the pipe and the air inlet port 1202. The outer periphery of the labyrinth sealing structure is blown clean through multiple air blowing ports 1203. Of course, an adjustable nozzle can also be connected to the air outlet port 707. The nozzle can be adjusted to the cleaning part, and the cleaning part can be cleaned when the drive shaft 3 is working.

[0051] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A bearing housing for a coal mining machine, comprising a housing body (1), wherein the inner ring of the housing body (1) has a space for accommodating a bearing (2), and the inner ring of the bearing (2) is connected to a drive shaft (3), characterized in that: Also includes: The sealing structure includes a static sealing ring (4) and a dynamic sealing ring (5). The static sealing ring (4) is fixed to the side of the seat (1), and the dynamic sealing ring (5) is fixed to the drive shaft. The mating surfaces of the static sealing ring (4) and the dynamic sealing ring (5) are labyrinth sealing structures. The dust removal structure includes multiple permanent magnet rings (6) sleeved on the outer periphery of the dynamic sealing ring (5). The magnetic poles of the multiple permanent magnet rings (6) are arranged at different intervals on their outer surfaces. An airbag structure (7) is fixed on the side of the seat (1). The airbag structure (7) has a permanent magnet plate (704) and an airbag (705) located on the outer periphery of the permanent magnet rings (6). The air outlet (707) of the airbag (705) is connected to the dust removal part located on the seat (1).

2. The bearing housing for a coal mining machine according to claim 1, characterized in that: The static sealing ring (4) includes a first sealing part (401) located inside the seat body (1). The outer periphery of the first sealing part (401) is bent to fit the side of the seat body (1). The dynamic sealing ring (5) includes a second sealing part (501). The middle part of the second sealing part (501) is provided with a second sealing part (502) that fits the first sealing part (402).

3. A bearing housing for a coal mining machine according to claim 2, characterized in that: The labyrinth sealing structure consists of multiple layers of first convex rings (403) arranged from the inside to the outside on the surface of the first sealing part (401), and second convex rings (503) arranged from the inside to the outside on the surface of the second sealing part (502) interleaved with the multiple layers of first convex rings (403).

4. A bearing housing for a coal mining machine according to claim 3, characterized in that: The inner ring of the second sealing part (501) has a groove, and a circular sealing ring (8) is embedded in the groove. The top of the second sealing part (501) facing the first sealing part (401) has a V-shaped sealing ring (9), and the two sides of the V-shaped sealing ring (9) abut against the inner surfaces of the second sealing part (502) and the first sealing part (401) respectively.

5. A bearing housing for a coal mining machine according to claim 4, characterized in that: The second sealing part (501) has a retaining ring (10) on the outer periphery of the side away from the first sealing part (401). The permanent magnet rings (6) on both sides are symmetrically embedded inside the retaining ring (10). The surface of the permanent magnet ring (6) is provided with a plurality of first fixing bolts (11). The first fixing bolts (11) pass through the permanent magnet ring (6) and the second sealing part (501) and fix the surface of the transmission shaft (3).

6. A bearing housing for a coal mining machine according to claim 5, characterized in that: The airbag structure (7) is fixed to the side of the seat body (1) by a pressure plate member. The pressure plate member includes a fixing ring (12) in the shape of a Γ. The horizontal part of the fixing ring (12) abuts against the circumferential surface of the first sealing part (402), and the vertical part of the fixing ring (12) abuts against the side of the first sealing part (402). The surface of the fixing ring (12) is provided with a plurality of second fixing bolts (13). The second fixing bolts (13) pass through the fixing ring (12) and the first sealing part (402) and are fixed to the side of the seat body (1).

7. A bearing housing for a coal mining machine according to claim 6, characterized in that: The airbag structure (7) is provided in two sets, and the two sets of airbag structures (7) are symmetrically fixed on both sides of the seat (1).

8. A bearing housing for a coal mining machine according to claim 7, characterized in that: The airbag structure (7) includes a fixing block (701) horizontally fixed to a fixing ring (12). A limiting cylinder (702) is fixed at the bottom of the fixing block (701). A sliding plate (703) is slidably connected inside the limiting cylinder (702). A permanent magnet (704) is fixed at the bottom of the sliding plate (703). The bottom of the airbag (705) is fixed on the sliding plate (703). An air inlet port (706) and an air outlet port (707) connected to the top of the airbag (705) are installed on the top of the limiting cylinder (702). A one-way valve is installed on both the air inlet port (706) and the air outlet port (707).

9. A bearing housing for a coal mining machine according to claim 8, characterized in that: The dust removal section includes an air distribution channel (1201) opened in the fixed ring (12). The top of the fixed ring (12) is provided with an air inlet port (1202) connected to the air outlet port (707) through a pipe. The inner ring surface of the fixed ring (12) is evenly provided with a plurality of air blowing ports (1203) communicating with the air distribution channel (1201). The air blowing ports (1203) face the outside of the contact surface of the static sealing ring (4) and the dynamic sealing ring (5).

10. A bearing housing for a coal mining machine according to any one of claims 1-9, characterized in that: The seat (1) is composed of a lower semicircular fixed seat (101) and an upper semicircular fixed seat (102). The lower semicircular fixed seat (101) and the upper semicircular fixed seat (102) are provided with mutually fixed lower end surfaces and upper end surfaces. A sealing gasket (103) is connected between the lower end surface and the upper end surface. An oil inlet plug (14) is provided on the upper semicircular fixed ring (12).

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