Bearing mounting hole brushing tool

Abstract

The utility model belongs to the technical field of bearing corrosion prevention, and particularly relates to a bearing mounting hole brushing tool which comprises a brushing head used for making contact with a brushing mounting hole and a brush handle used for being connected with the brushing head, the brushing head comprises an elastic base body, an isolation layer and a flexible coating adsorption layer, the elastic base body is of a spherical structure, the outer surface of the elastic base body is wrapped with the isolation layer, and the flexible coating adsorption layer is arranged on the elastic base body. The outer surface of the isolation layer is coated with a flexible coating adsorption layer, the flexible coating adsorption layer is immersed into the inner hole of the coating coating mounting hole, the isolation layer isolates the coating to prevent the elastic base body from being corroded, and the elastic base body supports the flexible coating adsorption layer to make contact with the inner hole of the mounting hole for coating; a connecting port is embedded in the brushing head, and the brushing head is detachably connected with the brush handle through the connecting port. The painting heads of different sizes can be manufactured according to the mounting holes of different apertures, the phenomena of sagging, orange peel, paint particle protrusion and the like are avoided in the painting process, operation is easy and convenient, operation can be conducted by multiple persons at the same time, and the anti-corrosion machining efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearing anti-corrosion, and particularly relates to a painting tooling for bearing mounting holes. Background Technique

[0002] The anti-corrosion quality of the mounting hole is one of the important conditions affecting the installation life of large turntable bearings, main wind turbine bearings, yaw bearings, and pitch bearings. If the anti-corrosion of the mounting hole fails to meet the technical requirements, the following situations will occur: 1. Corrosion and corrosive damage: It will cause corrosion of the bearing and the surrounding metal materials, thereby reducing the service life and performance of the bearing. Even fatigue crack sources will occur at the corroded parts, and the cracks will gradually expand, eventually leading to fatigue fracture of the bearing. 2. Structural looseness: Corrosion will weaken the structural strength of the metal, resulting in structural looseness of the mounting hole, which will cause the bearing to be unstable, and further affect the operation safety of the mechanical equipment. 3. Precision loss: Corrosion of the mounting hole will also cause precision loss during bearing installation, affecting the centering and rotational balance of the bearing, and further affecting the operation efficiency of the entire mechanical equipment.

[0003] There are mainly two existing anti-corrosion processes for mounting holes:

[0004] 1. Pouring paint process: The pouring paint process is used for hole anti-corrosion. The paint surface of the mounting hole is smooth and flat, and the paint thickness is relatively thick. However, it has the following disadvantages:

[0005] ① The adhesion is not good. When the protective plug is inserted and then pulled out, the paint layer at the hole opening is easy to fall off in pieces. According to the cross-cut test of the GB / T 9286-1998 standard, the adhesion is relatively low, reaching 2-3 levels.

[0006] ② There is a serious sag phenomenon on the surface of the paint layer at the hole opening after pouring paint, which is difficult to clean.

[0007] ③ The pouring paint process requires at least 4 people, and the operations of plugging, pouring paint, turning the crane, and cleaning and shoveling are cumbersome.

[0008] ④ The paint drips to the ground, wasting materials and polluting the environment. The paint in the pipe and the pot cannot be reused, and the paint cost is very high.

[0009] 2. Spraying paint process: The spraying paint process is used for hole anti-corrosion. The paint surface of the mounting hole is smooth and flat, but it has the following disadvantages:

[0010] ① The thickness of each spray is 10-15um. If it exceeds this size, it is very easy to produce sag and other phenomena. Generally, for hole anti-corrosion requirements above 100um, 6-7 sprays are required, and each spray needs to be dried for more than 8 hours before the second spray, with low efficiency.

[0011] ② Painting requires a closed space, which pollutes the environment and wastes materials. All other anti-corrosion surfaces need to be protected before spraying holes to prevent the mist from spraying holes from contaminating other anti-corrosion surfaces and making them difficult to clean. Protection requires a lot of man-hours to prepare, the initial protection cost is high, and painting can only be done by one person;

[0012] ③ The spray painting process has a very limited range of paint types. Only epoxy thick paste primer and topcoat can be used. Epoxy zinc-rich primer with better anti-corrosion effect cannot be used because the spray holes of this type of spray painting tooling are easily clogged with zinc particles of epoxy zinc-rich paint. Each cleaning requires the tooling to be disassembled, which is time-consuming and paint-consuming.

[0013] ④ Since the hole spraying is done manually by moving up and down quickly in the hole, the upper and lower end faces of the installation hole stay for a long time, resulting in the paint layer on the upper and lower end faces of the hole being thicker than the paint layer in the middle of the hole. After 6-7 repeated spraying, the paint layer thickness at the two positions differs by at least 60um, and the overall thickness is uneven.

[0014] In recent years, as the use environment of bearings has become increasingly harsh, the height and diameter of the bearings have increased by nearly one-fold compared to the original bearing size, the number of mounting holes has increased by nearly one-fold, and the length of the mounting holes has increased by nearly 1.5 times. The increase in height has increased the difficulty of hole anti-corrosion processing; at the same time, higher requirements have been put forward for the bearing anti-corrosion process, such as the thickness of the anti-corrosion layer of the mounting hole has increased from the original 10-20um to more than 100um. The original spray paint anti-corrosion process and the filling paint anti-corrosion process are difficult to meet the current needs, and the paint used in the processing is costly, the tooling loss rate is high, and the processing efficiency is low. Summary of the invention

[0015] In view of the defects of the above-mentioned prior art, the purpose of the utility model is to provide a bearing mounting hole painting tool and its manufacturing method and painting method, which are simple and convenient to operate during the anti-corrosion operation, can be operated by multiple people at the same time, improve the anti-corrosion processing efficiency, improve the anti-corrosion quality requirements, increase the service life of the tool, and reduce the cost of using the tool.

[0016] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a bearing mounting hole painting tool, including a painting brush head for contacting and painting the mounting hole and a brush handle for connecting the painting brush head, the painting brush head including an elastic substrate, an insulating layer and a flexible paint adsorption layer, the elastic substrate is a spherical structure, the outer surface of the elastic substrate is coated with an insulating layer, the outer surface of the insulating layer is coated with a flexible paint adsorption layer, the paint is immersed in the flexible paint adsorption layer to paint the inner hole of the mounting hole, the paint is isolated by the insulating layer to prevent corrosion of the elastic substrate, and the flexible paint adsorption layer is supported by the elastic substrate to contact and brush the inner hole of the mounting hole; a connection port is embedded in the painting brush head, and the painting brush head is detachably connected to the brush handle through the connection port.

[0017] Further, the connection port of the brushing head is connected to the brush handle through a taper adapter. The barbed limiting part of the taper adapter is assembled into the connection port of the brushing head, and the threaded connection part of the taper adapter is threadedly connected to the brush handle.

[0018] Further, a hoop is fixed on the taper adapter between the brushing head and the brush handle. A part of the barbed limiting part of the taper adapter is assembled into the connection port of the brushing head, and the hoop is fastened on the other part of the barbed limiting part of the taper adapter.

[0019] Further, the brush handle is a split and detachable structure. The brush handle includes a connecting rod and an extended connecting rod. One end of the connecting rod is detachably connected to the brushing head, and the other end of the connecting rod is detachably connected to the extended connecting rod.

[0020] Further, both the connecting rod and the extended connecting rod are tapered nylon rods. Threaded plugs are in interference fit and inlaid at both ends of the connecting rod. A threaded plug is in interference fit and inlaid at the small end of the extended connecting rod. The threaded plug at the small end of the connecting rod is connected to the connection port of the brushing head through a taper adapter. The threaded plug at the large end of the connecting rod is connected to the threaded plug at the small end of the extended connecting rod through a double-headed bolt.

[0021] Further, the connecting rod is a tapered nylon rod with dimensions of Φ15*Φ22*250mm, and the taper is 1:70. An M6*1 threaded plug made of material 45# is inlaid at the Φ15 end position of the connecting rod, and an M8*1.25 threaded plug made of material 45# is inlaid at the Φ22 end position of the connecting rod. The extended connecting rod is a tapered nylon rod with dimensions of Φ22*Φ26*150mm, and the taper is 1:70. An M8*1.25 threaded plug made of material 45# is inlaid at the Φ22 end position of the extended connecting rod.

[0022] Further, the elastic matrix is a spherical structure formed by fixing polyester fiber three-dimensional PP cotton wrapped with degreased white gauze. The diameter of the elastic matrix is 3 - 5mm smaller than the diameter of the installation hole. The isolation layer is a PE polyethylene shrink film. The flexible coating adsorption layer is a coarse plain cloth, and the thickness of the flexible coating adsorption layer is 2mm.

[0023] Method for manufacturing a brushing tool for bearing installation holes, the steps are as follows:

[0024] Step 1: Fix polyester fiber three-dimensional PP cotton into a spherical shape by wrapping it with degreased white gauze, with a diameter 3 - 5mm smaller than the diameter of the installation hole;

[0025] Step 2: Wrap the fixed-size cotton ball completed in the previous step with a PE polyethylene shrink film;

[0026] Step 3: Wrap the fixed-size cotton ball completed in the previous step with a C32X32 coarse plain cloth;

[0027] Step 4: Fix the fixed brushing head to the brushing head connecting device with a hoop;

[0028] Step 5: Interference fit and plug both ends of the connecting rod of the conical nylon;

[0029] Step 6: Interference fit and plug the small end of the lengthened connecting rod of the conical nylon, and connect the lengthened rod connecting device;

[0030] Step 7: Connect and install the special brushing head, the brushing head connecting device, and the connecting rod in sequence, and assemble or disassemble the lengthened rod connecting device and the lengthened connecting rod according to the height of the installation hole.

[0031] Furthermore, the brushing head connecting device is a taper joint, and the lengthened rod connecting device is a double-headed bolt.

[0032] For the brushing method using the above-mentioned bearing installation hole brushing tooling, under the conditions of temperature 5 - 38°C, relative humidity < 80%, and the difference between the dew point value and the bearing surface temperature ≥ 3°C, mix according to the required paint ratio. After the paint is prepared, use a stirrer to stir at the bottom of the paint to make it evenly mixed. After being evenly mixed, let it stand for a ripening time of more than 15 minutes; store the prepared paint in separate small cups. Immerse the brushing head completely in the paint. After the outermost flexible coating adsorption layer absorbs a sufficient amount of paint, the brushing head enters the installation hole and first moves up and down, then moves along the circumferential direction to evenly apply the paint on the inner wall of the installation hole.

[0033] The beneficial effects of the present utility model are as follows: The brushing head immerses into the coating through the flexible coating adsorption layer to coat the inner hole of the installation hole. The isolation layer isolates the coating to prevent corrosion of the elastic matrix. The elastic matrix supports the flexible coating adsorption layer to contact and brush the inner hole of the installation hole. Brushing heads of different sizes can be made according to installation holes of different apertures. During the brushing process, phenomena such as running, orange peel, and paint particle protrusions do not occur. The operation is simple and convenient, and multiple people can operate simultaneously, improving the anti-corrosion processing efficiency and the anti-corrosion quality requirements. The tooling can be reused, is not easily corroded or damaged, and has low raw material loss. Description of the Drawings

[0034] Figure 1 It is a schematic diagram of an M6 thread plug;

[0035] Figure 2 It is a schematic diagram of an M8 thread plug;

[0036] Figure 3 It is a schematic diagram of the brushing head;

[0037] Figure 4 It is a schematic diagram of the taper joint;

[0038] Figure 5 It is a schematic diagram of the double-headed bolt;

[0039] Figure 6 It is a schematic diagram of the connecting rod;

[0040] Figure 7 This is a schematic diagram of extending the connecting rod;

[0041] Figure 8 This is an exploded view of the painting tooling;

[0042] Figure 9 For painting tooling assembly;

[0043] Figure 10 This is a schematic diagram of the painting status of the painting tool;

[0044] Figure 11 for Figure 10 Enlarged picture of the middle coating tooling;

[0045] In the figure: 1. brush head, 2. pagoda joint, 3. connecting rod, 4. stud bolt, 5. extended connecting rod, 6. clamp, 7. M6 thread plug, 8. M8 thread plug. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0047] See attached Figures 1-11 The bearing mounting hole painting tool comprises a painting head 1 for contacting and painting the mounting hole and a brush handle for connecting the painting head 1, the painting head comprises an elastic substrate, an insulating layer and a flexible paint adsorption layer, the elastic substrate is a spherical structure, the outer surface of the elastic substrate is coated with an insulating layer, the outer surface of the insulating layer is coated with a flexible paint adsorption layer, the paint is immersed in the flexible paint adsorption layer to paint the inner hole of the mounting hole, the paint is isolated by the insulating layer to prevent the elastic substrate from corroding, and the flexible paint adsorption layer is supported by the elastic substrate to contact and paint the inner hole of the mounting hole; a connection port is embedded in the painting head, and the painting head is detachably connected to the brush handle through the connection port.

[0048] Furthermore, the connection port of the paint brush head is connected to the brush handle via a pagoda joint 2, the barbed limit portion of the pagoda joint is assembled into the connection port of the paint brush head, and the threaded connection portion of the pagoda joint is threadedly connected to the brush handle.

[0049] Furthermore, a clamp 6 is fixed on the pagoda joint between the brush head and the brush handle, a part of the barbed limit part of the pagoda joint 2 is assembled into the connecting port of the brush head, and the clamp is fastened to another part of the barbed limit part of the pagoda joint.

[0050] Further, the brush handle is a detachable split structure, and the brush handle includes a connecting rod 3 and an extended connecting rod 5. Both the connecting rod 3 and the extended connecting rod 5 are tapered nylon rods. Thread plugs are embedded at both ends of the connecting rod by interference fit. A thread plug is embedded at the small end of the extended connecting rod by interference fit. The thread plug at the small end of the connecting rod is connected to the connection port of the painting head through a reducing union 2. The thread plug at the large end of the connecting rod is connected to the thread plug at the small end of the extended connecting rod through a double-headed bolt 4.

[0051] Based on the above technical solution, it should be noted that the operator can choose whether to install the extended connecting rod 5 according to the height of the installation hole. When the height of the installation hole is relatively low, the brush handle connecting the painting head 1 is only the connecting rod 3. When the height of the installation hole is relatively high, a double-headed bolt 4 and an extended connecting rod 5 are added to the rear end of the connecting rod 3.

[0052] Further, the connecting rod is a tapered nylon rod with dimensions of Φ15*Φ22*250mm, and the taper is 1:70. An M6*1 thread plug made of material 45# is embedded at the Φ15 end of the connecting rod, and an M8*1.25 thread plug made of material 45# is embedded at the Φ22 end. The extended connecting rod is a tapered nylon rod with dimensions of Φ22*Φ26*150mm, and the taper is 1:70. An M8*1.25 thread plug made of material 45# is embedded at the Φ22 end of the extended connecting rod.

[0053] Further, the elastic matrix is a spherical structure formed by fixing polyester fiber three-dimensional PP cotton wrapped with degreased white gauze. The diameter of the elastic matrix is 3-5mm smaller than the diameter of the installation hole. The isolation layer is a PE polyethylene shrink film. The flexible paint adsorption layer is a coarse plain cloth, and the thickness of the flexible paint adsorption layer is 2mm.

[0054] Based on the above technical solution, it should be noted that the size of the painting head can be made according to the diameter of the installation hole. The specific material selection of the elastic matrix, the isolation layer and the flexible paint adsorption layer is not limited to the above description, and other materials that can achieve the corresponding functions also belong to the protection scope of the present invention.

[0055] Manufacturing method of the painting tool for bearing installation holes. Make the brush head according to the diameter of the bearing installation hole, using polyester fiber (three-dimensional PP cotton artificial chemical fiber), 100*100mm PE - polyethylene shrink film, 100*100*2mm C 32X32 coarse plain cloth, Φ15*Φ22*250mm tapered nylon rod (taper 1:70), Φ22*Φ26*150mm tapered nylon rod (taper 1:70), M8*1.25 thread plug, M6*1 thread plug, 100*100mm degreased white gauze.

[0056] Step 1: Wrap and fix polyester fiber three-dimensional PP cotton with 100*100mm degreased white gauze into a spherical shape, with a diameter 3-5mm smaller than the diameter of the installation hole.

[0057] Step 2: Wrap the cotton balls of the fixed size completed in the previous step with a 100*100mm PE polyethylene shrink film.

[0058] Step 3: Wrap the cotton balls of the fixed size completed in the previous step with a 100*100*2mm C32X32 plain cloth.

[0059] Step 4: Fix the fixed special brush head ( Figure 3 ) to the pagoda joint ( Figure 4 ) with an iron hoop.

[0060] Step 5: Interference fit and plug both ends of the conical nylon connecting rod ( Figure 6 ). Plug an M6*1 thread plug made of material 45# at the Φ15 end position ( Figure 1 ), and plug an M8*1.25 thread plug made of material 45# at the Φ22 end position ( Figure 2 ).

[0061] Step 6: The double-headed bolt ( Figure 5 ) connects the lengthened connecting rod of the conical nylon ( Figure 7 ). Similarly, plug an M8*1.25 thread plug made of material 45# at the Φ22 end position ( Figure 2 ).

[0062] Step 7: Connect and install the special brush head, pagoda joint, connecting rod, double-headed bolt, and lengthened connecting rod in sequence ( Figure 8 ).

[0063] There are several installation holes evenly distributed on the circumferential direction of the end face of the bearing ring. Under the conditions that the environmental requirements for spray painting are a temperature of 5 - 38°C, a relative humidity of <80%, and a difference between the dew point value and the bearing surface temperature of ≥3°C, mix according to the paint ratio required by the paint manufacturer. After the paint is prepared, use the head of the stirrer to stir at the bottom of the paint to make it evenly stirred. After being evenly stirred, it should be left to age for more than 15 minutes to allow it to fully react and mix. This hole anti-corrosion painting tooling replaces the painting heads of different sizes and specifications according to the size of the installation hole, and this spherical painting head fits the shape of the installation hole better.

[0064] Store the prepared paint in separate small cups. Immerse the painting head fully in the paint. Since the polyester fiber three-dimensional PP cotton is protected by the PE - polyethylene shrink film and will not be corroded by the paint, only the outermost 2mm thick C32X32 plain cloth is soaked. After the surface absorbs a sufficient amount of paint, the painting head enters the hole and moves up and down first and then along the circumferential direction to evenly coat the inner wall of the installation hole.

[0065] The advantages of the painting tooling and painting method of the present utility model are as follows:

[0066] 1. No phenomena such as running, orange peel, and paint particle protrusions occur;

[0067] The installation hole painting tooling not only retains the spherical brush head and PP cotton, which is more elastic and better fits the inner wall of the curved installation hole, but also has a three-dimensional PP cotton made of polyester fiber protected by PE polyethylene shrink film and not corroded by paint. Only the outermost 2-mm thick C32X32 coarse plain cloth is soaked, absorbing a small amount of paint and evenly applying it to the inner wall of the installation hole. No phenomena such as sagging, orange peel, or paint particle protrusion will occur during the painting process.

[0068] 2. It can process installation holes with different diameters;

[0069] The installation hole painting tooling has multiple painting heads of different sizes. According to the diameter of different installation holes, different sizes and specifications of painting heads can be switched and connected in a threaded manner, with stable and convenient replacement.

[0070] 3. It can process installation holes with different lengths;

[0071] The installation hole painting tooling has a connecting rod, which can be applied to bearings of different heights. For installation holes with a long length, a lengthening rod is used for processing; for installation holes with a short length, the lengthening rod is removed, and the entire installation hole can be painted comprehensively from top to bottom without omission.

[0072] 4. The tooling can be reused, is not easily corroded or damaged, and has low raw material loss;

[0073] The core of the special painting head of the installation hole painting tooling is not immersed in paint. Only the paint on the 2-mm thick coarse plain cloth needs to be cleaned, resulting in very low raw material loss; soaking and cleaning with a special paint cleaning solution will not cause decomposition, shedding, or damage like brushes, sponges, etc., and can be reused repeatedly.

[0074] 5. It is light in weight and easy to operate;

[0075] The painting tooling rod is made of nylon, with a small density and light weight. Its performance is not easily bent, corrosion-resistant, and not easily damaged. Operators will not strain their arms during long-term use, ensuring safety. The conical structure is convenient for flexible painting operations.

[0076] 6. High painting processing efficiency;

[0077] When using the installation hole painting tooling to paint, the paint layer thickness is more uniform. It can be painted 50 - 60 um at a time, and only two coats are required to reach 100 um. Moreover, with the effect of the lengthening rod, the entire inner surface of the installation hole can be painted in one go without turning it over, and multiple people can operate simultaneously to improve efficiency.

[0078] 7. It can use different types of paint;

[0079] The installation hole painting tooling can easily switch the painting head. This painting device can be applied to any type of paint (polyurethane topcoat, epoxy thick film primer, epoxy zinc-rich primer), and the tooling cost is low.

[0080] 8. High adhesion of the anti-corrosion layer;

[0081] The installation hole painting tooling is used to paint the paint, and the anti-corrosion layer has high adhesion. The cross-cut test (meeting grades 0 - 1) according to the standard of GB / T 9286 - 1998 and the pull-off test (meeting ≥5 Mpa) according to the standard of GB / T 5210 - 2006 both meet the customer requirements.

[0082] It should be noted that the parts not detailed in this utility model are prior art.

[0083] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this utility model.

[0084] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0085] In this utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "linkage", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0086] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0087] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0088] The above are only the best embodiments of the present utility model. Obviously, the present utility model is not limited to the above embodiments and there can be many variations. All variations that can be directly derived or associated by those of ordinary skill in the art from the content disclosed in the present utility model shall be considered as the protection scope of the present utility model.

Claims

1. A bearing installation hole painting tooling, characterized in that: It includes a painting head for contacting and painting the installation hole and a brush handle for connecting the painting head. The painting head includes an elastic matrix, an isolation layer, and a flexible paint adsorption layer. The elastic matrix is a spherical structure, and the outer surface of the elastic matrix is coated with an isolation layer, and the outer surface of the isolation layer is coated with a flexible paint adsorption layer; a connection port is embedded in the painting head, and the painting head is detachably connected to the brush handle through the connection port.

2. The brush tool for coating the bearing mounting hole according to claim 1, characterized in that: The connection port of the painting head is connected to the brush handle through a taper adapter. The barb limiting part of the taper adapter is assembled into the connection port of the painting head, and the threaded connection part of the taper adapter is threadedly connected to the brush handle.

3. The painting tool for bearing mounting holes according to claim 2, characterized in that: A hoop is fixed on the taper adapter between the painting head and the brush handle. A part of the barb limiting part of the taper adapter is assembled into the connection port of the painting head, and the hoop is fastened on the other part of the barb limiting part of the taper adapter.

4. A painting tool for a bearing mounting hole according to claim 1, characterized in that: The brush handle is a split and detachable structure. The brush handle includes a connecting rod and an extended connecting rod. One end of the connecting rod is detachably connected to the painting head, and the other end of the connecting rod is detachably connected to the extended connecting rod.

5. A painting tool for bearing mounting holes according to claim 4, characterized in that: Both the connecting rod and the extended connecting rod are tapered nylon rods; threaded plugs are embedded at both ends of the connecting rod by interference fit. A threaded plug is embedded at the small end of the extended connecting rod by interference fit. The threaded plug at the small end of the connecting rod is connected to the connection port of the painting head through a taper adapter. The threaded plug at the large end of the connecting rod is connected to the threaded plug at the small end of the extended connecting rod through a double-headed bolt.

6. A bearing mounting hole painting tooling according to claim 5, characterized in that: The connecting rod is a tapered nylon rod with dimensions of Φ15*Φ22*250mm, and the taper is 1:

70. An M6*1 threaded plug made of material 45# is embedded at the Φ15 end position of the connecting rod, and an M8*1.25 threaded plug made of material 45# is embedded at the Φ22 end position of the connecting rod; the extended connecting rod is a tapered nylon rod with dimensions of Φ22*Φ26*150mm, and the taper is 1:

70. An M8*1.25 threaded plug made of material 45# is embedded at the Φ22 end position of the extended connecting rod.

7. A painting tool for a bearing mounting hole according to any one of claims 1-6, characterized in that: The elastic matrix is a spherical structure formed by wrapping and fixing polyester fiber three-dimensional PP cotton with degreased white gauze; the isolation layer is a PE polyethylene shrink film; the flexible paint adsorption layer is a coarse plain cloth, and the thickness of the flexible paint adsorption layer is 2mm.

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