CN106311567B

CN106311567B - Bolt mounting hole, slewing bearing/slewing bearing and coating method thereof

Info

Publication number: CN106311567B
Application number: CN201510397928.2A
Authority: CN
Inventors: 汤卫斌; 董杰恩; 闫琪; 杨桥
Original assignee: Xuzhou Rothe Erde Slewing Bearing Co Ltd
Current assignee: Xuzhou Rothe Erde Slewing Bearing Co Ltd
Priority date: 2015-07-08
Filing date: 2015-07-08
Publication date: 2019-12-20
Anticipated expiration: 2035-07-08
Also published as: CN106311567A

Abstract

The invention relates to a bolt mounting hole, a slewing bearing/turntable bearing and a coating method thereof. The method is particularly applicable to smaller sized mounting apertures, which include plugging the lower end of the bolt mounting hole to be coated; injecting paint into the inside of the mounting hole; forming a paint adhesion layer in contact with an inner surface of the mounting hole; and recovering paint remaining in the mounting hole. Compared with the prior art, the scheme provided by the invention has the advantages that the coating surface quality is high, the film forming effect is good, the probability of the occurrence of defects of a paint coating is reduced, and the integral appearance quality of a slewing bearing product is ensured; the coating process can be used for coating a plurality of bolt mounting holes in batches, so that the processing efficiency is improved; in view of the fact that the coating process does not need to design a special paint spray gun, the coating process has the advantages of being high in universality, strong in implementability and the like.

Description

Bolt mounting hole, slewing bearing/slewing bearing and coating method thereof

Technical Field

The invention relates to the field of anticorrosion coating of slewing bearings/slewing bearings, in particular to an anticorrosion coating technology of a slewing bearing for wind power, and particularly relates to a screw mounting hole manufactured by a method and a slewing bearing/slewing bearing with the screw mounting hole, wherein paint coating on the inner wall of the mounting hole is realized by adopting a perfusion method.

Background

For a part of slewing bearings with higher anticorrosion grade requirements, such as slewing bearings for offshore wind turbines, customers require paint coating construction on the inner wall of a bolt mounting hole to meet the anticorrosion grade requirements of the use environment.

As shown in fig. 1, a plurality of bolt mounting holes are formed in the slewing bearing/slewing bearing, and the bolt mounting holes need to be painted to meet technological requirements such as corrosion resistance. The prior art uses a painting operation as shown in fig. 2a-2c, where paint is applied by a paint gun 2 that is inserted into the bolt-receiving hole of the slewing bearing 1. However, this mode of operation is generally limited by the size of the mounting hole, for example, the diameter of the mounting hole is generally much larger than the size of the paint spray gun. In the case of a mounting hole with a small specification, for example, the diameter of the mounting hole to be sprayed is less than 50mm, even 45mm and 33mm, and the like, and in order to meet the corrosion protection requirement of the use environment, the dry film thickness after spraying is required to be more than 100 μm for the inner wall of the mounting hole with the small specification. The foregoing requirements are difficult to achieve with prior art paint spray guns, particularly in the following areas:

1. in view of the small aperture of the mounting hole, the conventional paint spray gun cannot finish paint spraying and coating deeply, and a specially designed spray gun is required; this will increase the cost of the paint spraying process.

2. Even paint spray gun can get into in the mounting hole, nevertheless because the restriction in the mounting hole after going deep into, paint is not direct injection to the mounting hole inner wall, mainly relies on the afterbody to atomize and adheres to, causes the atomization effect extremely poor.

3. When the paint spray gun sprays the upper half part of the mounting hole, the upper surface of the mounting hole is easily polluted.

4. The paint spray gun is not easy to be centrally positioned in the mounting hole, and the thickness of the sprayed paint is not uniform easily.

5. When the paint spray gun is used for spraying large quantities of mounting holes, more workers are required to be occupied for long time one by one during construction, and efficiency is low.

6. Considering that the thickness of the dry film after spraying is required to be thicker, for example, the thickness is generally more than 100 μm, at least more than two times of spraying operation is required; the paint sprayed between two construction rooms needs to be dried and solidified, and the time consumption is long.

The mounting hole is used as a part difficult to implement in corrosion prevention construction and is generally ignored; in view of the above problems, it is desirable to provide a paint coating method for the inner wall of a mounting hole, which can realize efficient and reliable paint coating with a small size of the mounting hole.

Disclosure of Invention

To overcome the foregoing disadvantages, the present invention provides a paint application method suitable for smaller-sized mounting holes, mounting holes formed by the application method, and a support having mounting holes of this type.

According to one aspect of the present invention, a method of coating a bolt mounting hole of a slewing bearing/slewing bearing is provided. The method comprises the following steps: plugging the lower end part of the mounting hole to be coated; injecting paint into the inside of the mounting hole; forming a paint adhesion layer in contact with an inner surface of the mounting hole; and recovering paint remaining in the mounting hole.

According to a preferred embodiment of the present invention, wherein the method further comprises: pretreating the inner surface of the mounting hole; preferably, the pretreatment includes sand blasting, sanding and/or chemical solvent surface passivation.

According to a preferred embodiment of the present invention, wherein the method further comprises: after the redundant paint in the mounting hole is recovered, the paint retained on the inner wall of the mounting hole is attached to the inner wall, and a paint coating is formed on the attached layer.

According to a preferred embodiment of the present invention, wherein the mounting aperture is 50mm or less, preferably 45mm or less, more preferably 33mm or less.

According to a preferred embodiment of the present invention, wherein the method blocks the lower end portion of the mounting hole with a rubber plug or a plastic plug.

According to a preferred embodiment of the present invention, the method forms the paint coating by standing for a period of time, preferably between about 5-10 minutes.

According to a preferred embodiment of the present invention, the method may be performed by coating the mounting holes one by one or in batches.

According to a preferred embodiment of the present invention, the method forms a paint coating layer having a dry film thickness of 100 μm or more at one time.

According to another aspect of the present invention there is provided a bolt mounting hole for a slewing bearing/slewing bearing, wherein the mounting hole is painted using any one of the methods described above.

According to yet another aspect of the present invention, there is provided a slewing bearing/slewing bearing, wherein the slewing bearing/slewing bearing has the mounting hole formed as described above.

By adopting the method for coating the inner wall of the mounting hole, the mounting hole coated by the method and the support with the mounting hole, paint is fully attached to the inner wall of the mounting hole, the paint film formed by curing has good film forming effect and high efficiency, and can fully meet higher requirements of corrosion resistance and the like.

Drawings

FIG. 1 shows a schematic view of a slewing bearing/slewing bearing;

FIG. 2a shows a schematic view of a prior art paint spray gun coating the inner wall of a mounting hole; FIG. 2b shows a schematic view of the paint spray gun extending into the bolt mounting hole; FIG. 2c shows an enlarged schematic view of FIG. 2 b;

FIG. 3 shows a schematic construction diagram for paint application according to the present invention;

FIG. 4 shows a schematic diagram of the dried film inside the hole after paint application according to the present invention; and figure 5 shows a photograph of a dry film formed by the paint film after paint application according to the present invention.

Detailed Description

In view of the fact that the inner wall of a mounting hole with a smaller aperture cannot be sprayed by using a conventional paint spray gun, the invention provides a pouring method. In particular, the present invention relates to a method for producing,

as shown in fig. 3, first, one end of the bolt mounting hole 3 is closed with a suitable tool, and preferably, the mounting hole to be coated is closed from the bottom with a detachable elastic tool such as a plastic or rubber stopper 4 to form a semi-closed space like a container. In order to improve the affinity of paint to the surface of the mounting hole and improve the adhesion effect, it is preferable to perform surface treatment including sandblasting, grinding, and/or chemical solvent surface passivation on the inner wall of the mounting hole to be coated in advance.

And then, injecting a pre-prepared paint 5 to be coated and the like into the mounting hole blocked at the bottom.

And standing for a period of time, preferably between 5 and 10 minutes, so that the injected paint is sufficiently contacted with the inner wall surface of the mounting hole to achieve good curing adhesion. It should be noted that one skilled in the art may design the length of time required for the paint to contact the inner wall surface sufficiently according to the requirements of a particular application.

Finally, excess paint is then recovered from within the mounting hole. For example, a negative pressure line is used to return the remaining paint to the paint container. Preferably, the paint film attached to the inner wall of the mounting hole may be further subjected to a curing process to form the inner wall coating 6, for example, heating to a suitable temperature to accelerate the efficiency of the paint curing into a film.

According to the invention, the method for coating the inner wall of the mounting hole is adopted to form the hole for slewing bearing/mounting. Fig. 5 shows a photo of a dry film formed by the paint film after pouring, and through detection, the thickness of the dry film formed by one-time use of the method provided by the invention can reach more than 100 μm, for example, more than 120 μm, thereby meeting the higher-level requirements of corrosion prevention and the like.

Further, according to the present invention, there is also provided a slewing bearing/slewing bearing having bolt mounting holes formed by the aforementioned coating method.

Compared with the paint spray gun process in the prior art, the method for coating the inner wall of the mounting hole has the following advantages:

1. the coating surface quality is high, and the film forming effect is good, so that the probability of the occurrence of defects of the paint coating is reduced, and the integral appearance quality of a supporting product is ensured;

2. the coating process can be used for coating a plurality of mounting holes in batches, so that the processing efficiency is improved;

3. the coating process can meet high-grade requirements by virtue of the film forming thickness at one time, secondary or multiple construction is not needed, and the processing efficiency is further improved;

4. the coating process does not need to design a special paint spray gun, and has strong universality and practicability; and

5. the coating process recovers and recycles the redundant paint, thereby further reducing the production cost.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will recognize that the scope of the present invention as claimed is not limited to the preferred embodiments. Various changes and modifications to the embodiments described herein will be apparent to those skilled in the art without departing from the spirit and scope of the invention, and it is intended to cover in the appended claims all such modifications and changes as fall within the true spirit and scope of the invention.

Claims

1. A method of coating a bolt mounting hole of a slewing bearing/slewing bearing, the method comprising:

plugging the lower end part of the mounting hole to be coated;

injecting paint into the inside of the mounting hole;

forming a paint adhesion layer in contact with an inner surface of the mounting hole; and

and recovering the residual paint in the mounting hole.

2. The method of claim 1, further comprising: and pretreating the inner surface of the mounting hole.

3. The method of claim 2, wherein the pre-treatment comprises sand blasting, sanding, and/or chemical solvent surface passivation.

4. The method of claim 1, further comprising: after the redundant paint in the mounting hole is recovered, the paint retained on the inner wall of the mounting hole is attached to the inner wall, and a paint coating is formed on the attached layer.

5. The method according to any of the preceding claims 1-4, wherein the diameter of the mounting hole is 50mm or less.

6. The method of claim 5, wherein the diameter of the mounting hole is 45mm or less.

7. The method of claim 6, wherein the aperture of the mounting hole is 33mm or less.

8. A method according to any of the preceding claims 1-4, characterized in that the method comprises blocking the lower end of the mounting hole with a plug of elastic material.

9. The method according to any one of the preceding claims 1 to 4, wherein the paint adhesion layer is formed by standing for a certain period of time.

10. The method of claim 9, wherein the resting time is 5 to 10 minutes.

11. A method according to any of the preceding claims 1-4, characterized in that the mounting holes are coated one by one or in batches.

12. The method according to any one of the preceding claims 1 to 4, characterized in that the method forms a paint coating in one go with a dry film thickness of 100 μm or more.

13. The method according to claim 12, wherein the method forms the paint coating at one time with a dry film thickness of 120 μm or more.

14. A bolt mounting hole for a slewing bearing/slewing bearing, characterized in that the mounting hole is painted by a method according to any one of the preceding claims.

15. A slewing bearing/slewing bearing, characterized in that it has a bolt mounting hole according to claim 14.