Flotation machine scraper waterproof bearing assembly and protection device

Abstract

The present application belongs to the technical field of quartz sand screening process and equipment, and particularly relates to a waterproof bearing assembly and protection device for a scraper of a flotation machine. The scraper of the flotation machine is provided with a bearing. At present, the bearing is almost completely exposed to the splashing range of the flotation slurry. In addition, the production line works continuously, so the bearing will be in contact with more flotation slurry, the corrosion source is continuously superimposed, and the damage to the bearing components is aggravated and accelerated. The present application provides a waterproof bearing assembly and protection device for a scraper of a flotation machine. The bearing assembly is externally provided with a protection device. The protection device is a closed cavity. The protection device is fixedly assembled on the shell of the flotation machine together with the bearing assembly. The protection device comprises a box body, an air pump and an air inlet pipe. The present application protects the bearing and the like by using a closed protection device, so that the erosion of most of the reagents and the slurry to the bearing can be avoided. The protection device is inflated, and a small amount of reagents or slurry entering the box body is discharged, so as to prevent further intrusion into the position of the bearing.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of quartz sand screening process and equipment, and particularly relates to a waterproof bearing assembly and protection device of a scraper of a flotation machine. BACKGROUND

[0002] Quartz sand is an important industrial mineral raw material, which is widely used in many industries such as glass, electronic and electrical appliances, mechanical casting, metallurgy, chemical industry, cement, daily-use ceramic, refractory material, superhard material, functional filler, petroleum drilling and the like. The classification of silica sand mainly adopts screening and hydraulic classification. The main equipment used for separating silica sand by the hydraulic classification method includes a classifier, and the silica sand in the classifier is divided into three parts, namely, a floating layer, a suspended layer and a bottom-sinking layer, which occupy the upper, middle and lower three layers in the classification container. In actual production, the hydraulic classification is carried out in a hindered settling tank, and due to the characteristics of the hydraulic classification, a high dispersion degree must be provided between each particle size, and a certain cross-sectional size of the equipment is ensured to meet the requirements of classification accuracy and production rate. The hydraulic classification of silica sand is the main screening method at present, and a production line thereof includes steps such as original sand collection, conveying, primary desliming and impurity removal, scrubbing, classification and concentration, and the production line is generally continuously operated. The flotation machine includes a shell, an agitator, a scraper, a chute, a feeding pipe and the like, and the scraper is movably assembled on the shell through a bearing. The flotation machine is used for mixing a flotation reagent into the sand slurry conveyed through the feeding pipe, mixing and stirring the sand slurry through the agitator, combining the flotation reagent with the sand particles, and scraping the floating part out through the rotating scraper and discharging the floating part through the chute, and discharging the sinking part through the lower pipe.

[0003] In modern industrial production, the main purpose of the silica sand flotation is to remove iron-containing minerals and aluminum minerals (such as feldspar, mica and the like) so as to improve the purity of silicon dioxide. According to different impurities to be removed, the reagents used are also divided into several categories:

[0004] (1) Collector: used for selectively adsorbing on the surface of the target mineral to make it hydrophobic (water-repellent), so as to be able to adhere to the bubble and float out. Including: cationic collector: mainly used for removing feldspar in silica sand by flotation; amine collector: the most commonly used is dodecylamine, ether amine, and their cationic groups can effectively adsorb on the surface of the negatively charged feldspar under acidic or neutral conditions; anionic collector: mainly used for removing iron-containing minerals by flotation; petroleum sulfonate, oxidized paraffin soap: under alkaline conditions, the reagent can react with the metal ions on the surface of the iron-containing mineral to make it hydrophobic;

[0005] (2) Regulators: used to adjust the chemical properties of the slurry and the floatability of the mineral surfaces, to create conditions favorable for separation. They include: hydrofluoric acid or its salts, which are the most critical regulators for the flotation of feldspar, they can activate feldspar and suppress quartz, achieve separation of the two, HF has strong corrosive and toxic, is one of the main sources of equipment damage; sulfuric acid or sodium hydroxide is used to adjust the pH of the whole slurry to the optimal range; starch, dextrin: used to suppress quartz, prevent it from floating with the target mineral; water glass (sodium silicate): as a dispersant and depressor, can disperse slime and suppress quartz;

[0006] (3) Frothers: used to produce a large number of stable, uniform, and properly sized bubbles as the carrier of hydrophobic minerals, such as MIBC (methyl isobutyl carbinol), pine oil, and various alcohol frothers.

[0007] The damage of flotation reagents to mechanical parts is a comprehensive problem, mainly from chemical corrosion, physical wear and tear, and their synergistic effect, as follows:

[0008] (1) Chemical corrosion: this is the main source of damage, especially from strong acids, strong bases and strong electrolytes. HF not only can corrode most metals (generate fluoride), but also can strongly corrode materials containing silicon, such as glass, ceramic fillers and mechanical seals. It is also extremely destructive to stainless steel, which can destroy its passive film. Sulfuric acid causes the entire device to be in an acidic environment, causing uniform hydrogen evolution corrosion on carbon steel parts (such as tank body, scraper), accelerating equipment wear. Although the corrosion of alkali on steel is weaker than that of acid, but the concentrated alkali solution can cause carbon steel to be alkali brittle in the presence of stress, which is a kind of stress corrosion cracking, which may cause the sudden fracture of key stressed parts such as shaft and bearing seat. The slurry itself is an electrolyte solution, which will form a primary cell between different metal parts (such as stainless steel shaft and carbon steel connecting parts) or different regions of the same part, accelerating electrochemical corrosion. The presence of reagents enhances the conductivity of the solution, exacerbating the process;

[0009] (2) Synergistic effect of physical wear and tear and corrosion (corrosion-wear): there is continuous physical friction and grinding of mineral sand between the scraper and the tank body, the bearing and the seal. This wear will constantly wear away the protective corrosion product film (such as passive film) formed on the metal surface, exposing the fresh, active metal matrix to the corrosive reagent, thereby greatly accelerating the corrosion. After the metal surface is corroded by the reagent, it becomes loose, porous and has reduced strength, and is more easily worn away by the mineral sand and mechanical parts. This vicious cycle of "first corrosion, then wear, then accelerated corrosion" has a much faster damage rate than the sum of pure chemical corrosion or physical wear and tear;

[0010] (3) Damage to specific components: the lower surface and edge of the blade directly contact the ore pulp containing abrasive sand and corrosive reagents, while bearing the mechanical force of scraping the foam, and is the most serious part of the corrosion-wear synergistic effect. The shaft (stirring shaft / blade shaft) is similar to the blade and bears corrosion and wear. The seals (such as graphite, ceramic, and fluororubber) at this point are extremely susceptible to corrosion by HF, which is extremely destructive to traditional mechanical seal materials. If the shaft seal is corroded and worn out by the reagent, the corrosive ore pulp will invade the bearing interior. The hard particles in the ore pulp will severely wear the bearing raceway and rolling elements. Acid or alkaline liquids will corrode the bearing steel, causing pitting, rusting, and destroying the lubricating oil film, ultimately causing the bearing to seize, shaft to be held, or catastrophic damage.

[0011] Generally speaking, the mechanical components involved in the industrial production line do not operate continuously for a long time and should be maintained and repaired within a certain period (possibly a few weeks or a month or two) to prevent equipment damage and failure. However, for the present application, the actual working conditions are more severe. In the northern climate, the production line set up and operated in the open air (all or part of the process is handled in the open air, which can be equivalent to the open air) needs to work in non-frozen conditions, i.e., the production period is approximately 3-10 months per year. Therefore, the silica sand flotation production line is usually operated 24*7 hours during the production period, and all equipment is continuously working except for downtime for damage repair or replacement. Specifically, the flotation machine blade has a bearing, and currently the bearing is almost completely exposed to the splashing range of the flotation slurry. In addition, the production line is continuously working, and the bearing will be in contact with more flotation slurry, and the continuous addition of corrosion sources will aggravate and accelerate the damage of the bearing components. SUMMARY

[0012] The main purpose of the present application is to solve the above-mentioned existing problems and provide a flotation machine blade waterproof bearing assembly and protection device. In the actual production environment and working conditions of the present application, the bearing assembly and protection device can solve the problem of the bearing components being immersed in the flotation slurry and avoid their continuous exposure to the corrosion source environment.

[0013] The above-mentioned purpose is achieved by the following technical solutions:

[0014] The flotation machine blade waterproof bearing assembly and protection device, the flotation machine includes a housing, a blade, and a chute. The blade is provided with a shaft, and the end of the shaft is provided with a bearing assembly. The shaft is assembled on the housing through the bearing assembly. The characteristic is that:

[0015] The bearing assembly is externally provided with a protection device, which is a closed cavity. The protection device is fixedly assembled on the housing of the flotation machine together with the bearing assembly.

[0016] The protection device comprises a box, an air pump and an air inlet pipe. The box is fixedly assembled on the shell of the flotation machine. The air pump is fixedly connected to the box. The air inlet pipe is connected to the air pump and the box.

[0017] The bearing assembly comprises a bearing seat, a bearing body and a baffle. The bearing seat is fixedly assembled on the shell. The bearing body is fixedly assembled in the bearing seat. The shaft of the scraper is connected to the bearing body. The baffle is in the shape of a disc and is fixed on the shaft.

[0018] The box is provided with a through hole through which the shaft passes. The baffle is arranged at the through hole and is located outside the box. The through hole and the baffle are coaxial with the shaft.

[0019] The box is provided with a deformation ring made of flexible material at the through hole. The deformation ring is close to the baffle. The baffle is located outside the deformation ring relative to the box.

[0020] The protection device is divided into single-side protection device and opposite double-side protection device. The single-side protection device is suitable for the end position of the shaft of the scraper, is provided with a single through hole, a deformation ring and a baffle matched with the deformation ring. The opposite double-side protection device is suitable for the middle position of the shaft of the scraper. Symmetrical through holes, deformation rings and baffles matched with the deformation rings are provided on both sides of the bearing assembly.

[0021] The box is provided with an assembly cover. The box is in the shape of a square. The assembly cover is located on the side provided with the deformation ring. The assembly cover is in the shape of a truncated circular table or a truncated prism. The end surface of the assembly cover is closed. The side of the assembly cover provided with the deformation ring is an assembly surface. The assembly surface is parallel to the baffle.

[0022] The baffle comprises an inner baffle and an outer baffle. The inner baffle and the outer baffle are arranged in a spaced manner and are coaxial with the shaft. The radius of the inner baffle is smaller than that of the outer baffle.

[0023] The deformation ring is in the shape of a drum. The deformation ring comprises an interface part, a drum convex part and a sealing part. The interface part is located at one side end surface of the deformation ring and is fixedly connected to the assembly surface of the assembly cover of the box or is integrally formed. The drum convex part is located at the middle part of the deformation ring, is used for enclosing and accommodating the outer baffle and allows the outer baffle to freely rotate in the drum convex part. The sealing part is located at the other side end surface of the deformation ring and is assembled in the space between the inner baffle and the outer baffle. The sealing part is wrapped around the outer wall of the shaft by relying on its own elasticity.

[0024] The inner baffle is provided with a water permeable hole at the connection position with the shaft.

[0025] The bottom end of the drum convex part is provided with a water passage hole.

[0026] The water passage hole is provided with a one-way valve device made of flexible material.

[0027] The one-way valve device is a self-closing and wave-shaped folded rubber pipe.

[0028] The beneficial effects of the present application are as follows:

[0029] (1) The bearing is protected by the closed protective device, which can avoid most of the erosion of the bearing by the agent and mortar. Although the airtightness of the protective device is not completely sealed, compared with the current working condition and bearing damage, it has achieved good technical effect;

[0030] (2) The protective device is filled with air, which can discharge the small amount of agent or mortar that enters the box, and the box is a hard structure, only the part connected with the shaft uses flexible material, so when the box is filled with air, the air pressure will force the flexible deformation ring close to the retainer ring on the shaft, which increases the airtightness of the box while not affecting the rotation of the shaft relative to the protective device;

[0031] (3) Further, the retainer ring is provided with inner and outer layers, and the deformation ring is improved to a drum shape, which places the inner and outer retainer rings on both sides of the box in airtight environment, and the smaller inner retainer ring realizes the sealing of the box and blocks the invasion of external agent and mortar; The larger outer retainer ring located inside the box can block a small amount of agent or water that penetrates the deformation ring, form a narrow neck structure in the interface of the deformation ring, and prevent further invasion of the bearing position. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings of the present application are described as follows:

[0033] Figure 1 is the overall structure of the flotation machine and the protective device assembled thereon in embodiment 1 of the present application;

[0034] Figure 2 is the structure of the bearing assembly and the protective device in embodiment 2 of the present application;

[0035] Figure 3 is the structure of the bearing assembly and the protective device in embodiment 2 of the present application, which is a partial sectional view shown from a top view;

[0036] Figure 4 is the structure of embodiment 3 of the present application, which is a partial sectional view shown from a front view.

[0037] Among them, the reference signs are as follows:

[0038] 1 flotation machine, 11 shell, 12 scraper, 13 chute, 14 shaft;

[0039] 2 bearing assembly, 21 bearing seat, 22 bearing body, 23 retainer ring, 24 inner retainer ring, 25 outer retainer ring;

[0040] 3 guard, 301 single-side position guard, 302 opposite double-side position guard, 31 box body, 311 assembly cover, 312 assembly surface, 32 air pump, 33 air inlet pipe, 34 deformation ring, 341 interface part, 342 bulge part, 343 sealing part, 344 flow limiting device. DETAILED DESCRIPTION

[0041] Quartz sand flotation is an important mineral processing technology, the core purpose of which is to separate iron-containing minerals and other impurity minerals (such as feldspar, mica, etc.) 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 take advantage of the difference in hydrophobicity (oleophilicity) and hydrophilicity of mineral surfaces. In the flotation process: the target mineral (usually an impurity, such as an iron-containing mineral) becomes hydrophobic through the action of reagents and can adhere to air bubbles. The useful mineral (quartz) remains hydrophilic and stays in the water. Air is introduced to generate a large number of bubbles, and the hydrophobic impurity minerals float to the surface of the slurry with the bubbles, forming a froth layer that is scraped off as tailings (impurity product). The hydrophilic quartz remains at the bottom of the slurry and is discharged as concentrate (purified product). The basic principle of quartz sand flotation is "selective bubble carrying", which artificially enlarges the difference in hydrophilicity / hydrophobicity of the surfaces of quartz and impurity minerals by adding a series of reagents such as pH adjusters, depressants, collectors, and frothing agents.

[0042] Example 1.

[0043] As shown in Figure 1 , 2 , the flotation machine scraper waterproof bearing assembly and protection device described in this embodiment, the flotation machine 1 includes a housing 11, a scraper 12, a chute 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, is stirred by the mixer, and during this process, the flotation reagents are delivered to the slurry by the dosing system; the reagents and the slurry are thoroughly mixed and conditioned, causing the two types of materials in the slurry to float and sink, respectively; the material that floats on the water surface is discharged into the chute 13 by the rotating scraper 12 and is then output, and the sinking material is output through the discharge pipe at the bottom of the housing 11. The scraper 12 is provided with a shaft 14, and the end of the shaft 14 is provided with a bearing assembly 2. The shaft 14 is assembled on the housing 11 through the bearing assembly 2. The bearing assembly 2 is externally provided with a protection device 3, which is a closed cavity. The protection device 3 is fixedly assembled together with the bearing assembly 2 on the housing 11 of the flotation machine 1. As for the airtightness of the protection device 3, this embodiment is not strictly limited, or in other words, the connection between the protection device 3 and the shaft 14 of the bearing assembly 2 may not be strictly sealed, but other parts can be sealed.

[0044] The protection device 3 comprises a box 31, an air pump 32 and an air inlet pipe 33. The box 31 is fixedly assembled on the shell 11 of the flotation machine 1, the air pump 32 is fixedly connected on the box 31, and the air inlet pipe 33 is communicated between the air pump 32 and the box 31. The air pump 32 is used to continuously supply air to the closed protection device 3 formed by the box 31, so as to prevent the invasion of the medicine, water and mortar into the protection device 3. The air pump 32 is commonly used, and thus will not be described herein.

[0045] The bearing assembly 2 comprises a bearing seat 21, a bearing body 22 and a retaining ring 23. The bearing seat 21 is fixedly assembled on the shell 11, the bearing body 22 is fixedly assembled in the bearing seat 21, the shaft 14 of the scraper 12 is connected with the bearing body 22, and the retaining ring 23 is in the form of a disc and is fixed on the shaft 14. The box 31 is provided with a through hole allowing the shaft 14 to pass through, the retaining ring 23 is arranged at the through hole, and the retaining ring 23 is located outside the box 31. The through hole and the retaining ring 23 are coaxial with the shaft 14. The box 31 is provided with a deformation ring 34 made of flexible material at the through hole. The deformation ring 34 is close to and in contact with the retaining ring 23, and the retaining ring 23 is located outside the deformation ring 34 relative to the box 31. The protection device 3 is formed by the box 31, the deformation ring 34 thereon and the retaining ring 23 on the shaft 14, and forms a relatively closed cavity. When the air pump 32 supplies air into the cavity, the deformation ring 34 made of flexible material is forced to be close to and in contact with the rigid retaining ring 23 under the action of air pressure. The two rings achieve a certain degree of sealing while not affecting the rotation of the shaft 14 relative to the protection device 3, and also have a certain degree of effect of preventing the invasion of the medicine and mortar into the above-mentioned cavity.

[0046] The protection device 3 is divided into a single-side protection device 301 and an opposite double-side protection device 302. The single-side protection device 301 is suitable for the end position of the shaft 14 of the scraper 12, is provided with a single through hole, a deformation ring 34 and a retaining ring 23 matched with the deformation ring 34. The opposite double-side protection device 302 is suitable for the middle position of the shaft 14 of the scraper 12, is provided with symmetrical through holes, deformation rings 34 and retaining rings 23 matched with the deformation rings 34 on both sides of the bearing assembly 2. In actual production line, the flotation machine is usually a plurality of single machines operating in parallel, that is, the flotation machine 1 adopts a plurality of independent shells 11 to improve the flotation efficiency and effect. Therefore, the shafts 14 of the scrapers are usually connected in linkage or are further fixedly connected or even integrally formed as a shaft on the plurality of parallel shells 11. The bearing assemblies 2 are arranged at both end positions of the entire flotation machine 1 and at the positions of the two adjacent shells 11 in the middle to ensure the normal rotation of the scrapers 12. Therefore, the above-mentioned division of the protection device 3 into the single-side protection device 301 and the opposite double-side protection device 302 is set according to the actual situation of the production line.

[0047] Embodiment 2.

[0048] As Figure 2 , 3 shown in the above embodiment, the box 31 is provided with an assembly cover 311, the box 31 is square, the assembly cover 311 is located on the side where the deformation ring 34 is assembled, the assembly cover 311 is a truncated cone or a prism, the end face of the assembly cover 311 is truncated, and the side where the deformation ring 34 is provided is an assembly surface 312, which is parallel to the retainer ring 23. The retainer ring 23 includes an inner retainer ring 24 and an outer retainer ring 25, the inner retainer ring 24 and the outer retainer ring 25 are arranged at intervals and coaxial with the shaft 14, and the radius of the inner retainer ring 24 is smaller than that of the outer retainer ring 25. The deformation ring 34 is drum-shaped, and includes an interface part 341, a drum protrusion part 342, and a sealing part 343. The interface part 341 is located at one side end face of the deformation ring 34, is fixedly connected with the assembly surface 312 on the assembly cover 311 of the box 31, or is integrally formed. The drum protrusion part 342 is located at the middle part of the deformation ring 34, is used for sealing and accommodating the outer retainer ring 25, and allows the outer retainer ring 25 to rotate freely in the drum protrusion part 342. The sealing part 343 is located at the other side end face of the deformation ring 34 and is assembled in the interval between the inner retainer ring 24 and the outer retainer ring 25, and the sealing part 343 is wrapped around the outer wall of the shaft 14 by relying on its own elasticity.

[0049] In the embodiment 1, the technical effect of the protection device 3 is achieved by the deformation ring 34 being attached to the retainer ring 23 to form a relatively closed cavity, and the cavity is inflated by the air pump 32 to achieve positive pressure. However, this scheme has the problem that it cannot discharge the liquid such as medicine, water, and mortar that has invaded the protection device 3, or the problem that the discharge effect is not good only by inflation. Therefore, at least two improvements are provided in this embodiment. First, the retainer ring 23 is provided in two layers, the inner retainer ring 24 has the same effect as in the embodiment 1, and the outer retainer ring 25 is larger than the inner retainer ring 24, which can effectively block the liquid that invades accidentally. Second, the deformation ring 34 is designed to be drum-shaped in the middle and tapered at both ends, the drum protrusion part 342 in the middle can accommodate the outer retainer ring 25 to rotate freely, and can accommodate the liquid that invades accidentally to prevent the liquid from further entering the bearing box 31.

[0050] Further, to achieve better effect, the interface part 341 of the deformation ring 34 can be further reduced, and the possibility of further invasion of the liquid in the drum protrusion part 342 can be increased.

[0051] Embodiment 3.

[0052] As Figure 4As shown, on the basis of the above embodiment, the inner retaining ring 24 is provided with a water permeable hole (not shown in the figure) at the connection with the shaft 14. Under the positive pressure environment of the closed cavity of the protection device, if there is invading liquid, it will also be smoothly discharged through the water permeable hole. Further, the bottom end of the drum protrusion part 342 is provided with a water passage. If the liquid is completely discharged outward by the positive pressure through the sealing part 343 of the deformation ring 34, there may be a problem that the invading liquid cannot jump over the drum protrusion part 342 to the side of the sealing part 343. Therefore, by providing the water passage, the liquid collected at the bottom of the drum protrusion part 342 can be directly discharged.

[0053] In order to ensure the sealing of the protection device 3, the water passage is provided with a flow limiting device 344 to avoid excessive air leakage and damage the overall sealing. The purpose of the flow limiting device 344 is to allow gas and liquid to be discharged, but the discharge period, time, flow rate, opening amount and other parameters should be strictly limited. Preferably, the aforementioned flow limiting device 344 can be made of a one-way valve device made of flexible material. The one-way valve device is a self-closing, wave-shaped folded rubber pipe, similar to the deodorizing core structure of a floor drain.

[0054] Finally, it should be pointed out that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered by the scope of the claims of the present application.

Claims

1. A protection device for a waterproof bearing assembly of a scraper of a flotation machine, the flotation machine comprising a housing, a scraper, and a chute, the scraper being provided with a shaft, and the shaft being provided at an end portion thereof with the bearing assembly, and the shaft being assembled on the housing through the bearing assembly, characterized in that: the bearing assembly is externally provided with the protection device, the protection device being a closed cavity, and the protection device being fixedly assembled on the housing of the flotation machine together with the bearing assembly; the protection device comprises a box, an air pump, and an air inlet pipe, the box being fixedly assembled on the housing of the flotation machine, the air pump being fixedly connected to the box, and the air inlet pipe being in communication with the air pump and the box; the bearing assembly comprises a bearing seat, a bearing body, and a retainer, the bearing seat being fixedly assembled on the housing, the bearing body being fixedly assembled in the bearing seat, the shaft of the scraper being connected to the bearing body, and the retainer being in the shape of a disc and being fixedly connected to the shaft; the box is provided with a through hole allowing the shaft to pass through, the retainer being arranged at the through hole, and the retainer being located outside the box, the through hole and the retainer being coaxial with the shaft; the box is provided at the through hole with a deformation ring made of a flexible material, the deformation ring being closely fitted to the retainer, and the retainer being located outside the deformation ring relative to the box; the box is provided with an assembly cover, the box being in the shape of a square, the assembly cover being arranged at a side of the box where the deformation ring is arranged, the assembly cover being in the shape of a truncated circular cone or a truncated prism, an end face of the assembly cover being closed, and a side of the assembly cover where the deformation ring is arranged being an assembly face, the assembly face being parallel to the retainer; the retainer comprises an inner retainer and an outer retainer, the inner retainer and the outer retainer being arranged in a spaced-apart manner and being coaxial with the shaft, and a radius of the inner retainer being smaller than that of the outer retainer; the deformation ring is in the shape of a drum, the deformation ring comprising a joint portion, a drum protrusion, and a sealing portion, the joint portion being arranged at a side end face of the deformation ring and being used for fixedly connecting to the assembly face of the assembly cover of the box or being integrally formed, the drum protrusion being arranged at a middle portion of the deformation ring and being used for enclosing and accommodating the outer retainer and allowing the outer retainer to freely rotate in the drum protrusion, and the sealing portion being arranged at another side end face of the deformation ring and being arranged in a space between the inner retainer and the outer retainer, the sealing portion being wrapped around an outer wall of the shaft by relying on its own elasticity.

2. The protection device for the waterproof bearing assembly of the scraper of the flotation machine according to claim 1, characterized in that: the protection device is divided into a single-side protection device and an opposite double-side protection device, the single-side protection device being suitable for an end portion of the shaft of the scraper, being provided with a single through hole, a single deformation ring, and a single retainer matched with the deformation ring, and the opposite double-side protection device being suitable for a middle portion of the shaft of the scraper, being provided with symmetrical through holes, symmetrical deformation rings, and symmetrical retainers matched with the deformation rings at two sides of the bearing assembly.

3. The protection device for the waterproof bearing assembly of the scraper of the flotation machine according to claim 1, characterized in that: the inner retainer is provided at a position where the inner retainer is connected to the shaft with a water-permeable hole.

4. The protection device for the waterproof bearing assembly of the scraper of the flotation machine according to claim 1 or 3, characterized in that: a bottom end of the drum protrusion is provided with a water passage hole.

5. The protection device for the waterproof bearing assembly of the scraper of the flotation machine according to claim 4, characterized in that: the water passage hole is provided with a one-way valve device made of a flexible material.

6. The protection device for the waterproof bearing assembly of the scraper of the flotation machine according to claim 5, characterized in that: the one-way valve device is a self-closing rubber pipe folded in a wave shape. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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