A trough-type scrubbing machine lower end bearing arrangement

Abstract

This utility model discloses a lower end bearing device for a trough-type scrubbing machine, including a lower end bearing device comprising a lower end shaft, a shaft sleeve, an adapter, a bearing housing, a self-aligning roller bearing, and a double-hole shaft end retaining ring. This enables the device to achieve an ultra-long sealing life: employing a labyrinth seal (zigzag gap) to block mud and sand particles, combined with two lip seals to prevent slurry penetration, significantly improving the physical barrier capability against high-concentration mud and sand, preventing solid impurities from entering the bearing (extending the sealing life by more than 2 times compared to traditional structures, reaching the standard of 12 months of continuous operation); enhanced bearing operational stability: replacing sliding bearings with self-aligning rolling bearings eliminates the risk of dry friction caused by sliding friction, reducing frictional resistance by 40%-60% and reducing operating energy consumption by 15%-20%; and a double reduction in maintenance costs and downtime losses: reducing the annual maintenance frequency from 4-6 times to 1-2 times, increasing equipment availability by 20%-30%, and significantly reducing labor and spare parts replacement costs.

Description

Technical Field

[0001] This utility model relates to the field of trough-type scrubbing machine technology, and in particular to a lower end bearing device for a trough-type scrubbing machine. Background Technology

[0002] The trough scrubbing machine is a key preparatory equipment in the mineral processing flow, usually installed before the main separation processes such as crushing, magnetic separation, and flotation. Its core function is to effectively remove the ore slime adhering to the ore surface through powerful scrubbing, eliminating the interference and harm of slime to subsequent processes (such as flotation and magnetic separation), thereby significantly improving the process conditions of subsequent operations and enhancing the overall separation efficiency and final concentrate indicators.

[0003] In this equipment, the lower bearing supports of the left and right helical shafts that drive the slurry movement are inevitably immersed in a high-concentration, highly abrasive slurry environment for extended periods due to their working position. Therefore, the sealing performance and reliability of the bearings at this location directly determine whether the equipment can operate stably for a long time, and are a key aspect of the entire scrubbing machine design.

[0004] Currently, the commonly used bearing sealing solution for trough-type scrubbing machines in the industry is a pressure-sealed polymer tile sliding bearing support, supplemented by packing and a compression sealing ring. This structure mainly relies on pressurized water to form a water film between the sliding bearing tile and the journal, which serves to lubricate and initially block the slurry, while the outer packing provides further sealing. However, this traditional structure has significant shortcomings in practical applications: its service life is generally short, typically between 3 and 6 months. This means that the equipment needs to be shut down multiple times a year to replace the bearing sealing components, which not only increases maintenance costs and labor intensity, but more importantly, frequent shutdowns for maintenance severely affect the continuous operation time and washing efficiency of the equipment, leading to a decline in overall production efficiency and making it difficult to meet the requirements of modern concentrators for long-term stable operation of equipment.

[0005] The main reason for the above problems is that the slurry contains a large amount of hard, highly abrasive mud and sand particles and ore fragments. Sliding bearing shells (especially those made of polymer materials) are in direct contact with the slurry while bearing huge radial loads. Although protected by pressurized water, it is still difficult to completely prevent the intrusion of solid particles and the abrasive wear of the bearing shell surface. At the same time, the packing seal is also prone to failure under the continuous scouring of mud and sand particles. Once the seal fails, the slurry enters the bearing, leading to grease contamination, dilution, or loss, a sharp deterioration in the bearing's lubrication condition, and ultimately causing rapid bearing wear, seizure, or even burnout.

[0006] Therefore, there is an urgent need to develop a new type of sealing device for the lower bearing of a trough-type scrubbing machine. Its core objective is to significantly improve the reliability of the seal and the service life of the bearing (to more than one year), thereby reducing the number of downtime maintenance, ensuring the continuous and efficient operation of ore washing, and reducing operating costs. Utility Model Content

[0007] This utility model provides a lower end bearing device for a trough-type scrubbing machine, which can solve the problems mentioned in the background art.

[0008] This utility model provides a lower end bearing device for a trough-type scrubbing machine, comprising: The lower bearing assembly includes a lower shaft, a shaft sleeve, a transition piece, a bearing housing, a self-aligning roller bearing, and a double-hole shaft end retaining ring; The shaft sleeve is a split structure, with its two inner ring halves fitted onto the lower shaft via flat keys and fastened with bolts. The lower end of the shaft shoulder is provided with a groove, and an O-ring, a labyrinth fixed ring and a labyrinth moving ring are installed in sequence inside the groove. The labyrinth moving ring is fixed to the shaft shoulder by a set screw. The adapter has a single-layer lip seal at the front end and two layers of unidirectional lip seals at the rear end. A partition is provided between the two layers of seals, and the outer end is axially limited by a locking plate. The self-aligning roller bearing is heat-fitted onto the lower end shaft and secured by a double-hole shaft end retaining ring; The inner ring of the bearing housing is snapped with the self-aligning roller bearing and the stop of the transition piece, and the outer end face is sequentially fitted with a sealing gasket and a cap; The bearing housing is equipped with a grease nipple on the top, and the adapter is connected to an inlet pipe and an outlet pipe on both sides respectively.

[0009] In a trough-type scrubbing machine lower end bearing device according to one embodiment of the present invention, the lower end shaft is made of 45 steel and has undergone heat treatment.

[0010] In a trough-type scrubbing machine lower end bearing device according to an embodiment of this utility model, the adapter, bearing seat, and end cap are made of Q235B steel.

[0011] In a trough-type scrubbing machine lower end bearing device according to an embodiment of the present invention, the shaft sleeve, labyrinth fixed ring, and labyrinth moving ring are made of 16Mn wear-resistant steel.

[0012] In a trough-type scrubbing machine lower end bearing device according to an embodiment of this utility model, the lip seal structure of the adapter is specifically as follows: A single-layer lip seal is installed in the front groove, and two lip seals in the same direction are installed side by side in the rear groove. A metal partition is set between the two seals, and the locking plate is pressed to the end face of the adapter by bolts.

[0013] In a trough-type scrubbing machine lower end bearing device according to an embodiment of the present invention, the end sealing structure of the bearing seat includes: A sealing gasket is fitted to the outer end face of the bearing housing, and a cap is installed with bolts to form a secondary sealing barrier.

[0014] The technical solution provided in this application embodiment can include the following beneficial effects: This application designs a lower end bearing device for a trough-type scrubbing machine. Through the coordinated design of a mechanical seal rolling bearing support, a labyrinth seal, and a multi-layer lip seal structure, combined with high-pressure oil injection and circulating pressure water barrier technology, the following significant advantages are achieved: 1. Ultra-long sealing life: The labyrinth seal (zigzag gap) blocks mud and sand particles, and the two lip seals block the penetration of slurry, which significantly improves the physical barrier to high concentration of mud and sand and prevents solid impurities from entering the bearing (the sealing life is more than twice that of the traditional structure, reaching the standard of 12 months of continuous operation).

[0015] 2. Enhanced bearing operational stability: Replacing sliding bearings with self-aligning rolling bearings eliminates the risk of dry friction caused by sliding friction, reducing frictional resistance by 40%-60% and reducing operating energy consumption by 15%-20%.

[0016] 3. Reduced maintenance costs and downtime losses: The number of annual maintenance sessions is reduced from 4-6 to 1-2, equipment availability is increased by 20%-30%, and labor and spare parts replacement costs are significantly reduced.

[0017] 4. Enhanced environmental adaptability: The multi-layer sealing structure (labyrinth + lip seal + high-pressure oil / water) forms a four-level protection, which is especially suitable for extremely harsh slurry conditions with mud content >30% and particle size >1mm, reducing the failure rate by more than 50%.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is a cross-sectional structural schematic diagram and an enlarged schematic diagram of part II of a trough-type scrubbing machine according to an embodiment of this application; Figure 2 is Figure 1 A front view of the lower bearing assembly of a trough-type scrubbing machine; Figure 3 is Figure 1A schematic diagram of the installation structure of the lower bearing device of a trough-type scrubbing machine; Figure 4 is Figure 3 Another perspective view.

[0021] Reference numerals in the attached diagram: 1. Lower end shaft; 2. Shaft sleeve; 3. Labyrinth fixed ring; 4. Labyrinth moving ring; 5. Adapter; 6. Lip seal; 7. Bearing housing; 8. Self-aligning roller bearing; 9. Double-hole shaft end retaining ring; 10. End cap; 11. O-ring; 12. Sealing gasket; 13. Water inlet pipe; 14. Grease fitting; 15. Water outlet pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] Example: like Figures 1 to 4As shown, this application provides a lower end bearing device for a trough-type scrubbing machine, including: a lower end bearing device comprising a lower end shaft 1, a shaft sleeve 2, an adapter 5, a bearing housing 7, a self-aligning roller bearing 8, and a double-hole shaft end retaining ring 9; the shaft sleeve 2 is a split structure, with its two inner ring halves fitted onto the lower end shaft 1 via flat keys and secured with bolts; a groove is provided at the shoulder of the lower end shaft 1, and an O-ring 11, a labyrinth fixed ring 3, and a labyrinth moving ring 4 are sequentially installed inside the groove, with the labyrinth moving ring 4 fixed to the shaft end by set screws. Shoulder; the front end of the adapter 5 is provided with a single-layer lip seal 6, and the rear end is provided with two layers of unidirectional lip seals 6. A partition is provided between the two layers of seals, and the outer end is axially limited by a locking plate; the self-aligning roller bearing 8 is heat-fitted onto the lower shaft 1 and is pressed and fixed by a double-hole shaft end retaining ring 9; the inner ring of the bearing housing 7 is snapped with the self-aligning roller bearing 8 and the stop of the adapter 5, and the outer end face is sequentially installed with a sealing gasket 12 and a cap 10; the top of the bearing housing 7 is provided with a grease nipple 14, and the two sides of the adapter 5 are respectively connected to the water inlet pipe 13 and the water outlet pipe 15.

[0026] By adopting the above technical solutions, and through the coordinated design of the mechanical seal rolling bearing support, labyrinth seal, and multi-layer lip seal structure, combined with high-pressure oil injection and circulating pressure water barrier technology, the following significant advantages are achieved: First, ultra-long sealing life: The labyrinth seal (zigzag gap) blocks mud and sand particles, and the two lip seals block the penetration of slurry, which significantly improves the physical barrier to high concentration of mud and sand and prevents solid impurities from entering the bearing (the sealing life is more than twice that of the traditional structure, reaching the standard of 12 months of continuous operation). The high-pressure oil injection system forms a dynamic oil film barrier between the lip seals, enhancing the lubricity of the sealing interface and compensating for the wear gap of the sealing ring, further delaying seal failure.

[0027] Secondly, the bearing's operational stability is enhanced: replacing the sliding bearing with a self-aligning rolling bearing eliminates the risk of dry friction caused by sliding friction, reducing frictional resistance by 40%-60% and reducing operating energy consumption by 15%-20%. The circulating pressurized water system forms a reverse water flow barrier on the outside of the labyrinth seal, actively preventing slurry from seeping in. Combined with the uniform wear characteristics of the rolling bearing, the overall lifespan of the device is predictable and stable (2-4 times that of traditional resin bearings).

[0028] Next, maintenance costs and downtime losses both decrease: the number of annual maintenance sessions is reduced from 4-6 times to 1-2 times, equipment availability is increased by 20%-30%, and labor and spare parts replacement costs are significantly reduced; The manual dry grease pump design allows for grease replenishment without shutting down the machine, avoiding sudden shutdowns caused by wear of traditional packing seals.

[0029] Finally, environmental adaptability is improved: the multi-layer sealing structure (labyrinth + lip seal + high-pressure oil / water) forms a four-level protection, which is especially suitable for extremely harsh slurry conditions with mud content >30% and particle size >1mm, reducing the failure rate by more than 50%.

[0030] It should be noted that the assembly steps for the lower bearing assembly are as follows: a. Insert the O-ring 11 into the shoulder groove of the lower end shaft 1, and then successively insert the labyrinth fixed ring 3 and the labyrinth moving ring 4, and tighten the set screw to fix it; b. Install the two half-shaft sleeves 2 onto the lower shaft 1 using a flat key, and tighten the bolts; c. Install a single-layer lip seal ring in the front groove of the adapter 5, and install two unidirectional lip seal rings 6 in the rear groove. Add a metal partition in the middle and tighten the locking bolts. d. The self-aligning roller bearing 8 is heat-fitted to the lower shaft 1, and the double-hole shaft end retaining ring 9 is pressed and fixed. e. Connect the bearing housing 7 to the self-aligning roller bearing 8 and the adapter 5 stop, and install the sealing gasket 12 and the end cap 10 on the outer end face; f. Connect the inlet pipe 13 and the outlet pipe 15, and screw in the grease fitting 14. In one embodiment, the lower shaft 1 is made of 45 steel and undergoes quenching and tempering treatment. The lower shaft 1 is made of high-quality 45 carbon structural steel, and after quenching and tempering (quenching temperature 830℃±10℃, tempering temperature 550℃±20℃), the surface hardness reaches HRC28-32, while the core maintains HRC22-25. This process gives the shaft both high surface wear resistance and core toughness, allowing it to withstand the continuous scouring of hard particles in the slurry, while avoiding the risk of stress concentration fracture due to excessive shaft rigidity.

[0031] In one embodiment, the adapter 5, bearing housing 7, and end cap 10 are made of Q235B steel, which is machined after normalizing treatment (heating to 900℃ and holding for 2 hours, then air cooling). Q235B has a yield strength ≥235MPa, which reduces manufacturing costs while ensuring structural strength, and also has excellent weldability, facilitating local repairs during later maintenance.

[0032] In one embodiment, the shaft sleeve 2, labyrinth fixed ring 3, and labyrinth moving ring 4 are made of 16Mn wear-resistant steel, with the surface subjected to carburizing and quenching (carburized layer depth 1.2-1.5mm, surface hardness HRC58-62). The Mn content of 16Mn (1.2%-1.6%) significantly improves the material's resistance to impact and wear, making it suitable for high-speed rotating components in direct contact with slurry, reducing the wear rate by more than 70% compared to traditional polymer tiles.

[0033] In one embodiment, the sealing structure of the adapter 5 is divided into three levels of protection: Front-end single-layer seal: Install an oil-resistant rubber lip seal ring (Shore hardness 75±5), with the pre-tightening force controlled at 0.15-0.2MPa, to initially block larger particles; Rear double-layer seal: Two parallel fluororubber lip seals 6 (temperature resistance -20℃~200℃) are set, and a 304 stainless steel partition is installed between the two seals to distribute the force on the sealing surface; Locking plate clamping: Press the locking plate onto the end face of adapter 5 using M8 socket head cap screws. Adjust the axial compression to 0.3-0.5mm to ensure uniform deformation of the sealing ring.

[0034] In one embodiment, the end seal of bearing housing 7 employs a dual-redundant design: Primary sealing: A polytetrafluoroethylene (PTFE) gasket 12 (2mm thick, 30% compression ratio) is bonded to the outer end face of bearing housing 7 to isolate external moisture. Secondary sealing: The end cap 10 is connected to the bearing housing 7 by 6 sets of M12 bolts, and the mating surface is coated with anaerobic sealant (Loctite 518) to form a permanent sealing interface.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A lower end bearing device for a trough-type scrubbing machine, characterized in that, include: The lower bearing assembly includes a lower shaft, a shaft sleeve, a transition piece, a bearing housing, a self-aligning roller bearing, and a double-hole shaft end retaining ring; The shaft sleeve is a split structure, with its two inner ring halves fitted onto the lower shaft via flat keys and fastened with bolts. The lower end of the shaft shoulder is provided with a groove, and an O-ring, a labyrinth fixed ring and a labyrinth moving ring are installed in sequence inside the groove. The labyrinth moving ring is fixed to the shaft shoulder by a set screw. The adapter has a single-layer lip seal at the front end and two layers of unidirectional lip seals at the rear end. A partition is provided between the two layers of seals, and the outer end is axially limited by a locking plate. The self-aligning roller bearing is mounted on the lower end shaft and is pressed and fixed by a double-hole shaft end retaining ring; The inner ring of the bearing housing is snapped with the self-aligning roller bearing and the stop of the transition piece, and the outer end face is sequentially fitted with a sealing gasket and a cap; The bearing housing is equipped with a grease nipple on the top, and the adapter is connected to an inlet pipe and an outlet pipe on both sides respectively.

2. The lower bearing device of a trough-type scrubbing machine according to claim 1, characterized in that, The lower shaft is made of 45 steel and has undergone quenching and tempering treatment.

3. The lower end bearing device of a trough-type scrubbing machine according to claim 1, characterized in that, The adapter, bearing housing, and end cap are made of Q235B steel.

4. The lower end bearing device of a trough-type scrubbing machine according to claim 1, characterized in that, The shaft sleeve, labyrinth fixed ring, and labyrinth moving ring are made of 16Mn wear-resistant steel.

5. The lower end bearing device of a trough-type scrubbing machine according to claim 1, characterized in that, The lip seal structure of the adapter is specifically as follows: A single-layer lip seal is installed in the front groove, and two lip seals in the same direction are installed side by side in the rear groove. A metal partition is set between the two seals, and the locking plate is pressed to the end face of the adapter by bolts.

6. The lower end bearing device of a trough-type scrubbing machine according to claim 1, characterized in that, The end sealing structure of the bearing housing includes: A sealing gasket is fitted to the outer end face of the bearing housing, and a cap is installed with bolts to form a secondary sealing barrier.

Images