A dustproof sealing structure of a roller screen bearing seat

Abstract

The utility model discloses a kind of dustproof sealing structure of roller screen bearing seat, technical scheme is as follows: including the roller of bearing support of bearing housing shell through inside, bearing housing shell front and rear end is provided with front end cover and rear end cover, the front end of bearing is provided with labyrinth seal, the front portion of this labyrinth seal is provided with the flow guide body of sleeve connection on roller, the inclined flow guide surface of flow guide body outside is provided with dustproof spiral flow guide groove, roller outside is provided with the lock nut of bearing compression, the multiple sealing design of the utility model through labyrinth seal, flow guide body and spiral flow guide groove, effectively block dust invasion bearing interior, simultaneously through dust discharging hole and dust collector and promptly discharge accumulated dust, solve the problem of poor sealing performance, short bearing life in prior art, with effectively prevent dust invasion, prolong the service life of bearing, reduce maintenance cost and the like advantages.

Description

Technical Field

[0001] This utility model relates to the field of dust prevention for roller screen bearings, specifically to a dust prevention and sealing structure for roller screen bearing seats. Background Technology

[0002] As a key piece of equipment for coal grading and screening in coal washing plants, the roller screen works by utilizing the axial motion generated when materials at different speeds converge on the screen surface, thus distributing the material evenly on the screen surface. Simultaneously, coal particles smaller than the gaps between the screen shafts or the screen discs fall through. However, in actual operation, the roller screen bearings are subjected to a harsh working environment characterized by high moisture, dust, and heavy loads from the coal, with coal dust pollution being particularly prominent.

[0003] Currently, roller screen bearings mainly use a direct seal between the front cover O-ring and the roller. This simple sealing structure has significant drawbacks: firstly, the continuous friction between the O-ring and the high-speed rotating roller easily causes wear on the seal, reducing its lifespan to only 3 months; secondly, a single sealing structure is insufficient to effectively prevent the intrusion of fine dust. These problems lead to a rapid decline in bearing sealing performance. A large amount of dust entering the bearing chamber causes abnormal bearing wear, drastically shortening the bearing's lifespan to only about 6-8 months, far below the expected lifespan under normal operating conditions. This not only increases equipment maintenance costs but also seriously affects the continuity and stability of coal washing production. Furthermore, existing technologies lack effective dust removal mechanisms, and dust accumulation at the sealing points further exacerbates seal wear, creating a vicious cycle. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a dustproof and sealing structure for a roller screen bearing housing.

[0005] This utility model is achieved through the following technical solution:

[0006] This application provides a dustproof sealing structure for a roller screen bearing housing. The technical solution is as follows: it includes a bearing housing housing with a roller supported by an internal bearing. The bearing housing housing has a front end cover and a rear end cover at its front and rear ends. A labyrinth seal is provided at the front end of the bearing. A guide fluid is provided at the front of the labyrinth seal and sleeved on the roller. A dustproof spiral guide groove is provided on the inclined guide surface outside the guide fluid. A lock nut for pressing the bearing is provided on the outside of the roller.

[0007] Furthermore, this application also proposes that the front cover and the rear cover are fixedly connected to the bearing housing housing by multiple bolts, and a double-lip sealing ring is provided at the sealing point between the front cover and the roller shoulder.

[0008] Furthermore, this application also proposes that the labyrinth seal includes a labyrinth stationary ring that is threadedly connected to the inside of the bearing housing, and a labyrinth moving ring that forms a labyrinth sealing cavity with the front end of the labyrinth stationary ring, and the labyrinth moving ring is connected to a roller key.

[0009] Furthermore, this application also proposes that the guide fluid is connected to the roller key and its front end is in contact with the shaft shoulder for limitation, and the spiral direction of the spiral guide groove on the guide fluid is consistent with the rotation direction of the roller.

[0010] Furthermore, this application also proposes that a dust discharge hole is opened at the lower part of the bearing housing directly opposite the fluid guide, and a dust collector is connected to the lower part of the dust discharge hole through a connection port.

[0011] Furthermore, this application also proposes that the dust discharge hole be set in a conical shape.

[0012] Compared with existing technologies, the advantages of this utility model are: through the multiple sealing design of labyrinth seal, fluid guide and spiral guide groove, this utility model effectively prevents dust from entering the bearing, and at the same time, the accumulated dust is discharged in time through the dust discharge hole and dust collector, which solves the problems of poor sealing performance and short bearing life in the existing technology. It has the advantages of effectively preventing dust intrusion, extending bearing service life and reducing maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of this practical fluid-conducting device;

[0015] In the diagram: 1. Bearing housing; 2. Bearing; 3. Roller; 4. Front end cover; 5. Double lip seal; 6. Labyrinth stationary ring; 7. Labyrinth moving ring; 8. Guide fluid; 9. Inclined guide surface; 10. Spiral guide groove; 11. Lock nut; 12. Dust discharge hole; 13. Connection port; 14. Dust collector; 15. Rear end cover. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0017] like Figure 1-2 As shown, this application proposes a dustproof sealing structure for a roller screen bearing housing, including a bearing housing housing with a roller supported by an internal bearing. The bearing housing housing has a front end cover and a rear end cover at its front and rear ends. A labyrinth seal is provided at the front end of the bearing. A guide fluid is provided at the front of the labyrinth seal and sleeved on the roller. A dustproof spiral guide groove is provided on the inclined guide surface outside the guide fluid. A lock nut for pressing the bearing is provided on the outside of the roller.

[0018] The bearing housing can be made of cast iron or welded steel plate, with precisely machined bearing mounting positions inside. Double-row self-aligning roller bearings are preferred to withstand radial and axial loads. The roller surfaces require hardening treatment to improve wear resistance. The front and rear covers are positioned by a stop to ensure coaxiality, and a split structure can be used for easy assembly. The labyrinth seal consists of mating stationary and rotating rings; the stationary ring's inner bore is machined with reverse threads to enhance the sealing effect. The guide vane is made of aluminum alloy to reduce weight, and its spiral guide groove has a 45° helix angle to optimize flow. The lock nut has an anti-loosening structure and is tightened with a specified torque.

[0019] This structure solves the bearing dust problem through a multi-stage sealing mechanism. The labyrinth seal creates a winding channel to prevent dust from entering, while the spiral grooves of the guide fluid generate centrifugal force during rotation, expelling dust outwards. The lock nut ensures the bearing's axial positioning. Compared to traditional O-ring seals, this solution significantly extends the bearing's service life in dusty environments, while the self-cleaning function of the guide fluid reduces maintenance frequency. In practical implementation, all components must maintain strict dimensional tolerances and surface roughness requirements to ensure sealing performance.

[0020] Furthermore, this application also proposes that the front cover and the rear cover are fixedly connected to the bearing housing housing by multiple bolts, and a double-lip sealing ring is provided at the sealing point between the front cover and the roller shoulder.

[0021] Specifically, the double-lip seal is made of rubber or polyurethane and has an inner and outer sealing lip structure. The inner sealing lip forms a radial sealing contact with the roller shoulder, and the outer sealing lip forms an axial sealing contact with the inner wall of the front cover. Its service life is extended to 6 months. As a preferred embodiment, the cross-sectional shape of the double-lip seal can be designed as V-shaped or U-shaped, and the contact pressure of the sealing lips is controlled within the range of 0.2-0.5 MPa by the pre-compression amount.

[0022] Therefore, this technical solution effectively solves the problem of dust intrusion caused by easy wear of existing O-ring seals through the dual sealing structure of the double-lip seal ring and the bolt fixing connection. The two sealing barriers of the double-lip seal ring significantly improve the sealing reliability, with the radial seal preventing axial dust infiltration and the axial seal blocking radial dust penetration.

[0023] Furthermore, this application also proposes that the labyrinth seal includes a labyrinth stationary ring that is threadedly connected to the inside of the bearing housing, and a labyrinth moving ring that forms a labyrinth sealing cavity with the front end of the labyrinth stationary ring, and the labyrinth moving ring is connected to a roller key.

[0024] The labyrinth stationary ring is fixed inside the bearing housing via a threaded connection, which can be achieved using metric threads or pipe threads. The labyrinth moving ring is circumferentially fixed to the roller via a keyway, which can be a flat key or a semi-circular key structure. The labyrinth sealing cavity is formed by the alternating annular protrusions of the labyrinth stationary ring and the grooves of the labyrinth moving ring. The number of sealing cavities can be 3-5, with a fluid turning angle of 90°-120° between adjacent sealing cavities.

[0025] This technical solution effectively prevents dust intrusion through a multi-stage labyrinth seal structure. Threaded connections ensure the positioning accuracy of the stationary ring, while keyed connections guarantee synchronous rotation of the rotating ring and the roller. Compared to existing O-ring seals, labyrinth seals eliminate friction and wear issues, significantly extending seal life. As dust passes through the labyrinth seal cavity, it undergoes multiple changes in direction and expansion deceleration, ultimately being blocked on the outside of the seal structure, thus protecting the bearing from contamination. Specifically, when the roller operates at 800 r / min, the labyrinth seal can block over 99% of dust particles larger than 10 μm.

[0026] Furthermore, this application also proposes that the guide fluid is connected to the roller key and its front end is in contact with the shaft shoulder for limitation, and that the spiral guide groove on the guide fluid has a depth of 2mm, a pitch of 15mm, and the spiral direction is consistent with the rotation direction of the roller.

[0027] The guide fluid is fixed to the roller via a key connection, ensuring that the guide fluid rotates synchronously with the roller. The front end of the guide fluid contacts and is limited by a shoulder, which can be axially positioned using a stepped shaft structure or a separately installed locating ring. The groove depth and pitch of the spiral guide groove are optimized; a groove depth of 2mm ensures sufficient guiding space, and a pitch of 15mm creates an effective spiral airflow. The spiral direction is consistent with the roller's rotation direction; specifically, a right-hand thread can be used to match a clockwise rotating roller, or a left-hand thread can be used to match a counter-clockwise rotating roller.

[0028] This technical solution utilizes a precisely designed spiral guide channel structure to generate directional airflow as the roller rotates, discharging dust outwards along the spiral trajectory. A keyed connection ensures no relative movement between the guide fluid and the roller, preventing seal failure due to sliding friction. Contact limitation with the shaft shoulder guarantees axial positioning accuracy, preventing axial movement of the guide fluid from affecting the sealing effect. Compared to traditional static sealing structures, this dynamic guide design actively expels dust, making it particularly suitable for high-dust-concentration environments. The spiral parameters are optimized to ensure efficient flow while avoiding excessive airflow disturbance.

[0029] Furthermore, this application also proposes that a dust discharge hole is opened at the lower part of the bearing housing directly opposite the fluid guide, and a dust collector is connected to the lower part of the dust discharge hole through a connection port.

[0030] The dust discharge port is a tapered hole, with the larger end facing inwards towards the bearing housing and the smaller end facing towards the connection port. The angle of the tapered hole ranges from 30° to 60°, preferably 45°. The diameter of the dust discharge port ranges from 30mm to 40mm, preferably 35mm. The connection port is connected to the dust collector using a flange or threaded connection. The dust collector can be a baghouse dust collector.

[0031] This technical solution, by setting dust discharge holes on the guide tube and connecting them to a dust collector, can promptly discharge dust entering the sealed structure, preventing dust accumulation inside. The conical dust discharge hole design facilitates smooth dust discharge while preventing backflow of external dust. The connection port design facilitates the installation and maintenance of the dust collector. This solution effectively solves the problem of seal failure caused by dust accumulation in existing technologies, extending the service life of the bearings.

[0032] Furthermore, this application proposes that the dust discharge port adopt a conical orifice design. The conical orifice design effectively improves the smoothness of dust discharge. When the spiral guide channel directs dust to the dust discharge port, the conical structure prevents dust from accumulating and clogging within the channel. The gradually expanding orifice shape reduces dust flow resistance, and combined with the centrifugal force of the spiral guide channel, a continuous and stable dust discharge channel is formed. Furthermore, after the large end of the conical orifice aligns with the connection port, it ensures that dust smoothly enters the dust collector, preventing backflow at the interface. This design solves the problem of existing dust discharge ports easily clogging and causing sealing failure, and significantly improves the reliability of the dust control system by optimizing the dust discharge channel structure.

[0033] The implementation principle of the dustproof sealing structure for a roller screen bearing housing in this application is as follows:

[0034] The double-lip sealing ring 5 provided inside the front cover 4 can improve its service life and reduce the amount of dust entering. When the double-lip sealing ring 5 is used for a long time and the seal is reduced, the dust enters the front cover 4 and is thrown out along the spiral groove 10 on the rotating guide fluid 8 by the centrifugal force. The amount of dust accumulation is reduced by more than 85%. The dust is thrown out and guided to flow to the dust discharge hole 12 at the lower part. The dust is collected by the dust collector 14 connected at the lower part. When there is a lot of dust, the dust collector 14 can be removed for treatment.

[0035] The labyrinth stationary ring 6 and labyrinth moving ring 7 of the labyrinth seal at the rear end of the guide fluid 8 create a labyrinth flow channel structure (comb-shaped sealing sheet) to form a continuous contraction-expansion flow channel. The remaining dust is diverted through the labyrinth flow channel to generate eddies that consume kinetic energy, thereby reducing pressure difference and dust leakage. This reduces the amount of dust entering the rear bearing 2. At the same time, the labyrinth seal also prevents the grease in the bearing 2 from moving forward, ensuring the lubrication effect of the bearing 2. As a result, the service life of the bearing 2 is extended from 6-8 months to 18-24 months, and the bearing failure rate is reduced by 70%.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dustproof sealing structure for a roller screen bearing housing, comprising a bearing housing shell (1) and a roller (3) supported by an internal bearing (2), wherein the bearing housing shell (1) is provided with a front end cover (4) and a rear end cover (15) at its front and rear ends, characterized in that: The front end of the bearing (2) is provided with a labyrinth seal, and the front part of the labyrinth seal is provided with a guide fluid (8) sleeved on the roller (3). The inclined guide surface (9) on the outside of the guide fluid (8) is provided with a dustproof spiral guide groove (10). The outside of the roller (3) is provided with a lock nut (11) that presses the bearing (2).

2. The dust seal structure for a roller screen bearing housing according to claim 1, characterized in that: The front cover (4) and the rear cover (15) are fixedly connected to the bearing housing (1) by multiple bolts. A double-lip seal ring (5) is provided at the shoulder seal of the front cover (4) and the roller (3).

3. The dust seal structure for a roller screen bearing housing according to claim 1, characterized in that: The labyrinth seal includes a labyrinth stationary ring (6) that is threadedly connected to the inside of the bearing housing (1). The front end of the labyrinth stationary ring (6) is provided with a labyrinth moving ring (7) that forms a labyrinth seal cavity with it. The labyrinth moving ring (7) is keyed to the roller (3).

4. The dust seal for a roller screen bearing housing according to claim 1, wherein: The guide fluid (8) is keyed to the roller (3) and its front end contacts and restricts the contact with the shaft shoulder. The spiral direction of the spiral guide groove (10) on the guide fluid (8) is consistent with the rotation direction of the roller (3).

5. The dustproof sealing structure for a roller screen bearing housing according to claim 4, characterized in that: The guide fluid (8) has a dust discharge hole (12) at the bottom of the bearing housing (1), and a dust collector (14) is connected to the bottom of the dust discharge hole (12) through a connection port (13).

6. The dustproof sealing structure for a roller screen bearing housing according to claim 5, characterized in that: The dust discharge hole (12) is a tapered hole.

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