Flotation machine scraper waterproof bearing assembly and protection device

Abstract

The invention belongs to the technical field of quartz sand screening processes and equipment, and particularly relates to a flotation machine scraper waterproof bearing assembly and a protection device. The flotation machine scraping plate is provided with a bearing, the bearing is almost completely exposed in the splashing range of flotation mortar at present, in addition, a production line works continuously, the bearing can make contact with more flotation mortar, corrosion sources are continuously overlapped, and damage to bearing parts is aggravated and accelerated. The invention provides a flotation machine scraper waterproof bearing assembly and a protection device, the protection device is arranged outside the bearing assembly, the protection device is a closed cavity, and the protection device and the bearing assembly are fixedly assembled on a shell of a flotation machine; the protection device comprises a box body, an air pump and an air inlet pipe. The closed protection device is adopted to protect the bearing and the like, erosion of most of chemicals and mortar to the bearing can be avoided, the protection device is inflated, a small part of chemicals or mortar entering the box body is discharged, and the position where the bearing is located is prevented from being further invaded.

Description

Technical Field

[0001] This invention belongs to the technical field of quartz sand screening process and equipment, specifically relating to a waterproof bearing assembly and protective device for a flotation machine scraper. Background Technology

[0002] Quartz sand is an important industrial mineral raw material, widely used in numerous industries such as glass, electronics, machinery casting, metallurgy, chemicals, cement, daily-use ceramics, refractory materials, superhard materials, functional fillers, and oil drilling. Silica sand classification primarily employs screening and hydraulic classification. The main equipment used for separating silica sand via hydraulic classification includes a classifier. The sand in the classifier is divided into three parts: a floating layer, a suspended layer, and a settling layer, occupying the upper, middle, and lower layers of the classification container. In actual production, hydraulic classification is carried out in a hindered settling tank. Due to the characteristics of hydraulic classification, to achieve the required classification accuracy and productivity, a high degree of dispersion between particle sizes is necessary, requiring specific equipment cross-sectional dimensions. Silica sand hydraulic classification is currently the main screening method. Its production line includes steps such as raw sand collection, conveying, primary desliming and impurity removal, scrubbing, classification, and concentration. This production line generally operates continuously. The flotation machine includes a shell, a mixer, scrapers, chutes, and feed pipes. The scrapers are movably mounted on the shell via bearings. The flotation machine mixes flotation reagents into slurry conveyed through the feed pipe, and then mixes them with a mixer to combine the flotation reagents with the sand particles. The rotating scraper scrapes the floating part out and discharges it through the chute, while the sinking part is discharged through the lower feed pipe.

[0003] In modern industrial production, the main purpose of silica sand flotation is to remove iron- and aluminum-containing minerals (such as feldspar and mica) to improve the purity of silica. Depending on the impurities to be removed, the reagents used are divided into several categories: (1) Collectors: Used to selectively adsorb onto the surface of target minerals, making them hydrophobic, so that they can adhere to bubbles and float. These include: cationic collectors: mainly used for flotation to remove feldspar from silica sand; amine collectors: the most commonly used are dodecylamine and etheramine, whose cationic groups can effectively adsorb onto the negatively charged feldspar surface under acidic or neutral conditions; anionic collectors: mainly used for flotation to remove iron-containing minerals; petroleum sulfonates and oxidized paraffin soaps: these agents can react with metal ions on the surface of iron minerals under alkaline conditions, making them hydrophobic; (2) Modifiers: Used to adjust the chemical properties of the slurry and the floatability of the mineral surface, creating conditions favorable for separation. These include: hydrofluoric acid or its salts, which is the most critical modifier in the flotation of feldspar; it activates feldspar and inhibits quartz, achieving separation. HF is highly corrosive and toxic, and is one of the main sources of equipment damage; sulfuric acid or sodium hydroxide is used to adjust the pH of the entire slurry to the optimal range; starch and dextrin are used to inhibit quartz and prevent it from floating with the target mineral; water glass (sodium silicate) acts as a dispersant and inhibitor, dispersing slime and inhibiting quartz. (3) Foaming agents: used to generate a large number of stable, uniform bubbles of suitable size as a carrier of hydrophobic minerals, such as MIBC (methyl isobutyl alcohol), pine oil, and various alcohol foaming agents.

[0004] Damage to mechanical components by flotation reagents is a complex issue, primarily stemming from chemical corrosion, physical wear, and the synergistic effect of both, as detailed below: (1) Chemical corrosion: This is the most significant source of damage, especially from strong acids, strong alkalis, and strong electrolytes. HF not only corrodes most metals (generating fluorides) but also strongly corrodes silicon-containing materials such as glass, ceramic packings, and mechanical seals. It is also highly destructive to stainless steel, damaging its surface passivation film. Sulfuric acid creates an acidic environment for the entire equipment, causing uniform hydrogen evolution corrosion on carbon steel components (such as tanks and scrapers), accelerating equipment wear. Although alkalis are less corrosive to steel than acids, concentrated alkali solutions can cause alkali embrittlement of carbon steel under stress, a type of stress corrosion cracking that can lead to sudden breakage of critical load-bearing components such as shafts and bearing seats. The slurry itself is an electrolyte solution, and galvanic cells can form between different metal components (such as stainless steel shafts and carbon steel connectors) or between different areas of the same component, accelerating electrochemical corrosion. The presence of reagents enhances the conductivity of the solution, exacerbating this process. (2) Synergistic effect of physical wear and corrosion (corrosion-wear): There is continuous physical friction and grinding action of mineral sand between the scraper and the groove, and between the bearing and the seal. This wear will continuously wear away the protective corrosion product film (such as passivation film) formed on the metal surface, exposing the fresh and active metal substrate to the corrosive agent, thereby greatly accelerating corrosion. After the metal surface is corroded by the agent, it becomes loose, porous, and its strength decreases, making it easier to be worn away by mineral sand and mechanical parts. This vicious cycle of "corrosion first, then wear, and then accelerated corrosion" has a destructive speed far greater than the sum of simple chemical corrosion or physical wear; (3) Damage to specific components: The lower surface and edges of the scraper are in direct contact with the slurry containing abrasive mineral sand and corrosive agents, and are also subjected to the mechanical force of scraping foam, making them the areas with the most severe corrosion-wear synergistic effect. The shaft (stirring shaft / scraper shaft) is similar to the scraper, subject to corrosion and wear. The seals here (such as graphite, ceramics, and fluororubber) are extremely susceptible to corrosion by HF, which is highly destructive to traditional mechanical seal materials. If the shaft seals fail due to corrosion and wear by the agents, the corrosive slurry will penetrate into the bearing. Hard particles in the slurry will severely wear down the bearing raceways and rolling elements. Acidic or alkaline liquids will corrode the bearing steel, leading to pitting and rust, damaging the lubricating oil film, and ultimately causing the bearing to seize, become stuck, or suffer pulverized damage.

[0005] Generally, mechanical components on industrial production lines are not used continuously for extended periods and should be inspected and maintained periodically (perhaps every few weeks or one to two months) to prevent equipment damage and failure. However, the actual operating conditions are more severe for this application. In northern climates, production lines set up and operating outdoors (with all or part of the process handled in an open-air environment, equivalent to an open-air environment) need to operate under non-freezing conditions, meaning the production cycle is approximately from March to October each year. Therefore, silica sand flotation production lines typically operate 24 / 7 during the production cycle, with each piece of equipment operating continuously without stopping except for shutdowns for repair or replacement. Specifically, in this application, the flotation machine scraper has bearings, which are currently almost entirely exposed to the splashing range of the flotation slurry. With the continuous operation of the production line, the bearings will come into contact with even more flotation slurry, leading to a continuous accumulation of corrosion sources and exacerbating and accelerating the damage to the bearing components. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems and provide a waterproof bearing assembly and protective device for a flotation machine scraper. Under the actual production environment and working conditions of this application, such a bearing assembly and protective device can solve the problem of flotation slurry staining the bearing components and prevent them from being continuously exposed to the corrosion source environment.

[0007] The above objective is achieved by the following technical solution: A waterproof bearing assembly and protective device for a flotation machine scraper, the flotation machine including a housing, a scraper, and a chute, the scraper being provided with a shaft, the end of the shaft being provided with a bearing assembly, the shaft being assembled onto the housing via the bearing assembly, characterized in that: The bearing assembly is equipped with a protective device on the outside. This protective device is a sealed cavity and is fixedly assembled with the bearing assembly onto the housing of the flotation machine. The protective device includes a housing, an air pump, and an air inlet pipe. The housing is fixedly mounted on the shell of the flotation machine, the air pump is fixedly connected to the housing, and the air inlet pipe connects the air pump and the housing. The bearing assembly includes a bearing housing, a bearing body, and a retaining ring. The bearing housing is fixedly assembled on the housing, the bearing body is fixedly assembled inside the bearing housing, the shaft of the scraper is connected to the bearing body, and the retaining ring is disc-shaped and fixed on the shaft. The housing is provided with a through hole that allows the shaft to pass through, and a retaining ring is located at the through hole. The retaining ring is located on the outside of the housing, and both the through hole and the retaining ring are coaxial with the shaft. A deformation ring made of flexible material is provided at the through hole of the housing. The deformation ring is close to and fits against the retaining ring, and the retaining ring is located on the outside of the deformation ring relative to the housing.

[0008] The protective device is divided into a single-sided protective device and a double-sided protective device. The single-sided protective device is suitable for the end position of the scraper shaft and is equipped with a single through hole, a deformation ring, and a retaining ring that matches the deformation ring. The double-sided protective device is suitable for the middle position of the scraper shaft and is equipped with symmetrical through holes, deformation rings, and retaining rings that match the deformation rings on both sides of the bearing assembly.

[0009] The housing is equipped with an assembly cover. The housing is square, and the assembly cover is located on the side where the deformation ring is assembled. The assembly cover is in the shape of a truncated cone or a frustum. The end face of the assembly cover with the truncated cone and the side where the deformation ring is located is the assembly surface, which is parallel to the retaining ring.

[0010] The retaining ring includes an inner retaining ring and an outer retaining ring. The inner and outer retaining rings are arranged at intervals and are coaxial with the shaft. The radius of the inner retaining ring is smaller than that of the outer retaining ring. The deformation ring is drum-shaped and includes an interface portion, a bulge portion, and a sealing portion. The interface portion is located on one end face of the deformation ring and is used to be fixedly connected to the mounting surface on the housing assembly cover, or it can be integrally formed. The bulge portion is located in the middle of the deformation ring and is used to enclose and accommodate the outer retaining ring, allowing the outer retaining ring to rotate freely within the bulge portion. The sealing portion is located on the other end face of the deformation ring and is assembled in the gap between the inner and outer retaining rings. The sealing portion relies on its own elasticity to wrap around the outer wall of the shaft.

[0011] The inner retaining ring is provided with a water-permeable hole at the connection between it and the shaft.

[0012] The bottom end of the bulge is provided with a water passage hole.

[0013] The water passage is equipped with a one-way valve device made of flexible material.

[0014] The one-way valve device is a self-closing, corrugated rubber tube.

[0015] The beneficial effects of this invention are as follows: (1) By using a closed protective device to protect the bearings, most of the chemicals and mortar can be prevented from corroding the bearings. Although the airtightness of this protective device may not be completely sealed, it has achieved good technical results compared to the current working conditions and bearing damage. (2) Inflate the above-mentioned protective device with air. On the one hand, a small amount of the medicine or mortar that has entered the box can be discharged as much as possible. On the other hand, the box is a rigid structure and only the part connected to the shaft is made of flexible material. Therefore, when the box is inflated with air, the air pressure will force the flexible deformation ring close to the retaining ring on the shaft. While increasing the airtightness of the box, it does not affect the rotation operation of the shaft relative to the protective device. (3) Further, the retaining ring is set as an inner and outer layer, and the deformation ring is improved to a drum shape. The inner and outer retaining rings are placed on both sides of the sealed environment of the housing through this deformation ring. The smaller inner retaining ring achieves the sealing of the housing and prevents the intrusion of external agents and mortar. The larger outer retaining ring located inside the housing can block small amounts of agents or water that penetrate the deformation ring and form a narrower neck structure at the interface of the deformation ring to retain and accommodate space, preventing further intrusion into the bearing location. Attached Figure Description

[0016] The following describes the accompanying drawings in this application: Figure 1 This is a three-dimensional schematic diagram of the overall structure of the flotation machine and the protective device mounted thereon in Embodiment 1 of this application; Figure 2 This is a three-dimensional structural schematic diagram of the bearing assembly and protective device in Embodiment 2 of this application; Figure 3 This is a schematic plan view of the bearing assembly and protective device in Embodiment 2 of this application, with a partial sectional view shown from a top view. Figure 4 This is a schematic plan view of the structure of Embodiment 3 of this application. The accompanying drawing shows a partial cross-sectional view from the main viewpoint.

[0017] The reference numerals in the attached figures are as follows: 1. Flotation machine; 11. Shell; 12. Scraper; 13. Sluice box; 14. Shaft. 2. Bearing assembly, 21. Bearing housing, 22. Bearing body, 23. Retaining ring, 24. Inner retaining ring, 25. Outer retaining ring; 3 Protective devices, 301 Single-sided protective device, 302 Opposite double-sided protective device, 31 Housing, 311 Assembly cover, 312 Assembly surface, 32 Air pump, 33 Air inlet pipe, 34 Deformation ring, 341 Interface part, 342 Bulged part, 343 Sealing part, 344 Flow limiting device. Detailed Implementation

[0018] Quartz sand flotation is an important mineral processing technology. Its core purpose is to separate iron-bearing minerals and other impurity minerals (such as feldspar and mica) from quartz sand, thereby improving the purity and whiteness of quartz to meet the requirements of high-value-added industries such as glass, ceramics, electronics, and optics. The basic principle of flotation is to utilize the difference between the hydrophobic (oleophilic) and hydrophilic properties of mineral surfaces. During flotation: the target mineral (usually an impurity, such as iron-bearing minerals) becomes hydrophobic through the action of reagents, allowing it to adhere to air bubbles. The useful mineral (quartz) remains hydrophilic and stays in the water. Air is introduced, generating a large number of air bubbles. The hydrophobic impurity minerals float to the surface of the pulp with these bubbles, forming a foam layer, which is scraped off as tailings (impurity product). The hydrophilic quartz remains at the bottom of the pulp and is discharged as concentrate (purified product). The basic principle of quartz sand flotation is "selective bubble carrying," which artificially amplifies the difference in hydrophilicity / hydrophobicity between the surfaces of quartz and impurity minerals by adding a series of reagents such as pH adjusters, inhibitors, collectors, and frothers.

[0019] Example 1.

[0020] like Figure 1 , 2 As shown in this embodiment, the flotation machine scraper waterproof bearing assembly and protective device are described. The flotation machine 1 includes a housing 11, a scraper 12, a sluice 13, a mixer, a feed pipe, a discharge pipe, a dosing system, etc. The principle of the flotation machine is that the slurry enters the housing 11 of the flotation machine 1 through the feed pipe and is stirred by the mixer. During this process, flotation reagents are delivered to the slurry through the dosing system. The reagents and slurry are fully mixed and adjusted, causing the two materials with different properties in the slurry to float and sink respectively. The material floating on the water surface is discharged into the sluice 13 by the rotating scraper 12, and the material sinking is discharged through the discharge pipe at the bottom of the housing 11. The scraper 12 is provided with a shaft 14, and a bearing assembly 2 is provided at the end of the shaft 14. The shaft 14 is assembled onto the housing 11 through the bearing assembly 2. A protective device 3 is provided outside the bearing assembly 2. The protective device 3 is a sealed cavity and is fixedly assembled onto the housing 11 of the flotation machine 1 together with the bearing assembly 2. This embodiment does not strictly limit the airtightness of the protective device 3. In other words, the connection between the protective device 3 and the shaft 14 of the bearing assembly 2 may not be able to achieve a strict seal, but other parts can be sealed.

[0021] The protective device 3 includes a housing 31, an air pump 32, and an air inlet pipe 33. The housing 31 is fixedly mounted on the shell 11 of the flotation machine 1, the air pump 32 is fixedly connected to the housing 31, and the air inlet pipe 33 connects the air pump 32 and the housing 31. The purpose of the air pump 32 is to continuously supply air to the sealed protective device 3 formed by the housing 31, thereby removing reagents, water, mortar, etc. that may enter the protective device 3. The configuration of the air pump 32 is relatively conventional and will not be described in detail.

[0022] The bearing assembly 2 includes a bearing housing 21, a bearing body 22, and a retaining ring 23. The bearing housing 21 is fixedly mounted on the housing 11, and the bearing body 22 is fixedly mounted inside the bearing housing 21. The shaft 14 of the scraper 12 is connected to the bearing body 22. The retaining ring 23 is disc-shaped and fixed on the shaft 14. The housing 31 has a through hole that allows the shaft 14 to pass through. The retaining ring 23 is located at the through hole and is situated on the outside of the housing 31. Both the through hole and the retaining ring 23 are coaxial with the shaft 14. A deformation ring 34 made of flexible material is provided at the through hole of the housing 31. The deformation ring 34 is close to and fits against the retaining ring 23, with the retaining ring 23 located on the outside of the deformation ring 34 relative to the housing 31. The protective device 3 consists of a housing 31 and a deformation ring 34 on it, which are adapted to the retaining ring 23 on the shaft 14 to form a relatively sealed cavity. When the air pump 32 inflates the cavity, the deformation ring 34, made of flexible material, is forced to approach and adhere to the rigid retaining ring 23 by the air pressure. While achieving a certain degree of sealing, the two do not affect the rotation of the shaft 14 relative to the protective device 3, and also have a certain degree of effect in preventing the intrusion of the above-mentioned cavity by medicines and mortar.

[0023] The protective device 3 is divided into a single-sided protective device 301 and a double-sided protective device 302. The single-sided protective device 301 is suitable for the end position of the scraper 12 shaft 14, and is equipped with a single through hole, a deformation ring 34, and a retaining ring 23 that matches the deformation ring 34. The double-sided protective device 302 is suitable for the middle position of the scraper 12 shaft 14, and is equipped with symmetrical through holes, deformation rings 34, and retaining rings 23 that match the deformation rings 34 on both sides of the bearing assembly 2. In actual production lines, flotation machines are usually operated in parallel by several single machines. That is, flotation machine 1 uses multiple independently working housings 11 to improve flotation efficiency and flotation effect. Therefore, on the multiple housings 11 arranged in parallel, the shafts 14 of each scraper are usually set to be linked, or even further set to be fixedly connected, or even integrally formed into a single shaft. Bearing assemblies 2 are respectively set at both ends of the entire flotation machine 1 and at the two adjacent housings 11 in the middle to ensure the normal rotation operation of the scraper 12. Therefore, the above-mentioned division of the protective device 3 into two types, single-sided protective device 301 and opposing double-sided protective device 302, is designed to adapt to the actual situation of the production line.

[0024] Example 2.

[0025] like Figure 2 , 3As shown, based on the above embodiments, the housing 31 in this embodiment is provided with an assembly cover 311. The housing 31 is square, and the assembly cover 311 is located on the side where the deformation ring 34 is assembled. The assembly cover 311 is a frustum or truncated cone shape with a narrow opening. The end face of the assembly cover 311 with the narrow opening and the side where the deformation ring 34 is provided is the assembly surface 312, which is parallel to the retaining ring 23. The retaining ring 23 includes an inner retaining ring 24 and an outer retaining ring 25. The inner retaining ring 24 and the outer retaining ring 25 are arranged at intervals and are both coaxial with the shaft 14. The radius of the inner retaining ring 24 is smaller than that of the outer retaining ring 25. The deformation ring 34 is drum-shaped and includes an interface portion 341, a bulge portion 342, and a sealing portion 343. The interface portion 341 is located on one end face of the deformation ring 34 and is used to be fixedly connected to the mounting surface 312 on the mounting cover 311 of the housing 31, or it can be integrally formed. The bulge portion 342 is located in the middle of the deformation ring 34 and is used to enclose and accommodate the outer retaining ring 25, and allows the outer retaining ring 25 to rotate freely within the bulge portion 342. The sealing portion 343 is located on the other end face of the deformation ring 34 and is assembled in the gap between the inner retaining ring 24 and the outer retaining ring 25. The sealing portion 343 is wrapped around the outer wall of the shaft 14 by its own elasticity.

[0026] In Embodiment 1, the technical effect of the protective device 3 is achieved by forming a relatively sealed cavity through the fit between the deformation ring 34 and the retaining ring 23, and by using the air pump 32 to inflate the cavity to achieve positive pressure. This solution has the problem that it cannot discharge liquids such as medicines, water, and mortar that have already entered the protective device 3, or in other words, the discharge effect is not good by simply inflating the positive pressure. Therefore, this embodiment has at least two improvements: First, the retaining ring 23 is set as a double layer, with the inner retaining ring 24 functioning the same as in Embodiment 1, and the outer retaining ring 25 being larger than the inner retaining ring 24, which can effectively block the liquid that may accidentally enter; Second, the deformation ring 34 is designed with a shape that bulges out in the middle and tapers at both ends. The bulging part 342 in the middle can accommodate the free rotation of the outer retaining ring 25 and can retain the liquid that may accidentally enter, preventing the liquid from further entering the housing 31 where the bearing is located.

[0027] Furthermore, to achieve better results, the interface portion 341 of the deformation ring 34 can be further reduced to increase the possibility of liquid further intruding into the bulge portion 342.

[0028] Example 3.

[0029] like Figure 4As shown, based on the above embodiment, this embodiment has a water-permeable hole (not shown in the figure) at the connection between the inner retaining ring 24 and the shaft 14. Under the positive pressure environment of the sealed cavity of the protective device, any intruding liquid will be smoothly discharged through the water-permeable hole. Furthermore, a water-through hole is provided at the bottom end of the bulge 342. If the liquid is discharged outward entirely through the sealing part 343 of the deformation ring 34 by relying entirely on positive pressure, there may be a problem that the intruding liquid cannot jump over the obstruction on the side of the bulge 342 toward the sealing part 343. Therefore, by providing a water-through hole, the liquid collected at the bottom of the bulge 342 can be directly discharged.

[0030] To ensure the airtightness of the protective device 3, a flow-limiting device 344 is provided at the water inlet to prevent excessive air leakage from compromising the overall airtightness. The purpose of this flow-limiting device 344 is to allow gas and liquid to escape, but parameters such as the discharge cycle, duration, flow rate, and opening size should be strictly limited. Preferably, the aforementioned flow-limiting device 344 can be a one-way valve device made of flexible material. The one-way valve device is a self-closing, corrugated rubber tube, similar to the odor-proof core structure of a floor drain.

[0031] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A waterproof bearing assembly and protective device for a flotation machine scraper, the flotation machine comprising a housing, a scraper, and a chute, the scraper being provided with a shaft, the end of the shaft being provided with a bearing assembly, the shaft being assembled onto the housing via the bearing assembly, characterized in that: The bearing assembly is equipped with a protective device on the outside. This protective device is a sealed cavity and is fixedly assembled with the bearing assembly onto the housing of the flotation machine. The protective device includes a housing, an air pump, and an air inlet pipe. The housing is fixedly mounted on the shell of the flotation machine, the air pump is fixedly connected to the housing, and the air inlet pipe connects the air pump and the housing. The bearing assembly includes a bearing housing, a bearing body, and a retaining ring. The bearing housing is fixedly assembled on the housing, the bearing body is fixedly assembled inside the bearing housing, the shaft of the scraper is connected to the bearing body, and the retaining ring is disc-shaped and fixed on the shaft. The housing is provided with a through hole that allows the shaft to pass through, and a retaining ring is located at the through hole. The retaining ring is located on the outside of the housing, and both the through hole and the retaining ring are coaxial with the shaft. A deformation ring made of flexible material is provided at the through hole of the housing. The deformation ring is close to and fits against the retaining ring, and the retaining ring is located on the outside of the deformation ring relative to the housing.

2. The waterproof bearing assembly and protective device for the flotation machine scraper according to claim 1, characterized in that: The protective device is divided into a single-sided protective device and a double-sided protective device. The single-sided protective device is suitable for the end position of the scraper shaft and is equipped with a single through hole, a deformation ring, and a retaining ring that matches the deformation ring. The double-sided protective device is suitable for the middle position of the scraper shaft and is equipped with symmetrical through holes, deformation rings, and retaining rings that match the deformation rings on both sides of the bearing assembly.

3. The waterproof bearing assembly and protective device for the flotation machine scraper according to claim 1 or 2, characterized in that: The housing is equipped with an assembly cover. The housing is square, and the assembly cover is located on the side where the deformation ring is assembled. The assembly cover is in the shape of a truncated cone or a frustum. The end face of the assembly cover with the truncated cone and the side where the deformation ring is located is the assembly surface, which is parallel to the retaining ring.

4. The waterproof bearing assembly and protective device for the flotation machine scraper according to claim 3, characterized in that: The retaining ring includes an inner retaining ring and an outer retaining ring. The inner and outer retaining rings are arranged at intervals and are coaxial with the shaft. The radius of the inner retaining ring is smaller than that of the outer retaining ring. The deformation ring is drum-shaped and includes an interface portion, a bulge portion, and a sealing portion. The interface portion is located on one end face of the deformation ring and is used to be fixedly connected to the mounting surface on the housing assembly cover, or it can be integrally formed. The bulge portion is located in the middle of the deformation ring and is used to enclose and accommodate the outer retaining ring, allowing the outer retaining ring to rotate freely within the bulge portion. The sealing portion is located on the other end face of the deformation ring and is assembled in the gap between the inner and outer retaining rings. The sealing portion relies on its own elasticity to wrap around the outer wall of the shaft.

5. The waterproof bearing assembly and protective device for the flotation machine scraper according to claim 4, characterized in that: The inner retaining ring is provided with a water-permeable hole at the connection between it and the shaft.

6. The waterproof bearing assembly and protective device for the flotation machine scraper according to claim 4 or 5, characterized in that: The bottom end of the bulge is provided with a water passage hole.

7. The waterproof bearing assembly and protective device for the flotation machine scraper according to claim 6, characterized in that: The water passage is equipped with a one-way valve device made of flexible material.

8. The waterproof bearing assembly and protective device for the flotation machine scraper according to claim 7, characterized in that: The one-way valve device is a self-closing, corrugated rubber tube.

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