Protective structure for outer surface of jig and spraying jig

Abstract

The utility model relates to a jig outer surface protection structure and a spraying jig, the jig outer surface protection structure comprises a jig body, and the roughness of the outer surface of the jig body is Ra3.2; the outer surface of the jig body is coated with a protective layer made of Teflon. The adhesive force between the protective layer and the jig body is larger than the adhesive force between the paint layer sprayed on the protective layer and the protective layer, and the protective layer made of Teflon is coated on the surface of the jig, so that the whole outer surface of the jig is protected, and paint cannot be attached to the surface of the jig in the spraying process of the jig.

Description

Technical Field

[0001] The utility model relates to the technical field of spraying jigs, in particular to a protective structure for the outer surface of a jig and a spraying jig. Background Art

[0002] Painting is an essential process in the automobile production process. During the painting process, the workpiece is usually placed on a hanging fixture or a sled for painting. The process steps and painting methods of the two are different. For example, when using a sled for painting, the sled conveyor line is used to drive the workpiece and the sled body into the electrothermal pool together. Therefore, as the number of years of use increases, it passes through the electrothermal pool again and again. Primer will be continuously hung on the entire sled body, forming a thick layer of primer mud, which not only increases its own weight, but also causes inaccurate rotation and hanging, and the sled and body cannot be separated normally. Stacking and destacking will cause the sled to stick. For another example, when using a hanging fixture for painting, the process is roughly the same. The entire fixture will be hung with primer over and over again in the paint spraying room to form a thick layer of primer mud.

[0003] In order to solve the above technical problems, a coating jig structure is disclosed in the publication number CN204544546U, including a support foot, a conveying device is fixed on the upper end of the support foot, a self-rotating device is connected to the upper end of the conveying device, a jig support rod is connected to the upper end of the self-rotating device, a jig tray is installed on the upper end of the jig support rod, and a polytetrafluoroethylene jacket is provided on the outer periphery of the side of the jig support rod. The operation is safe and stable, maintenance is convenient, and the coating effect is good. The above scheme adopts a polytetrafluoroethylene jacket on the outer periphery of the side of the jig support rod to solve the defect of surface adhesion of paint, that is, in the process of producing the jig, a polytetrafluoroethylene jacket needs to be produced separately to realize its function. From the perspective of production cost, the production cost is higher. Because it is set on the support rod, the entire coating jig cannot be protected. That is to say, the place where the polytetrafluoroethylene jacket is set can be effectively protected, while the place where the polytetrafluoroethylene jacket is not set cannot be effectively protected. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a protective structure for the outer surface of the jig. By coating a protective layer made of Teflon on the surface of the jig, the entire outer surface of the jig is protected, so that paint cannot adhere to the surface of the jig during the spraying process.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a protective structure for the outer surface of a jig, comprising a jig body, the roughness of the outer surface of the jig body is Ra3.2; a protective layer made of Teflon is coated on the outer surface of the jig body; the adhesion between the protective layer and the jig body is greater than the adhesion between the paint layer sprayed on the protective layer and the protective layer.

[0006] Preferably, the thickness of the protective layer is greater than 30 μm.

[0007] Preferably, the roughness of the outer surface of the protective layer is Ra0.4-0.8.

[0008] The utility model also provides a coating jig, comprising the protective structure for the outer surface of the jig.

[0009] Preferably, the coating jig comprises a support frame, a cross-shaped beam body is fixedly installed in the middle of the support frame, and an H-shaped bracket is fixedly installed on the cross-shaped beam body.

[0010] Preferably, one end of the H-shaped bracket is fixedly connected to a connecting plate, a plurality of supporting plates are welded to the connecting plate, and the supporting plates are welded to the H-shaped bracket.

[0011] Preferably, the H-shaped bracket is provided with a plurality of positioning holes arranged in an array, and a drainage outlet which is through-connected with the positioning holes is provided at the connection between the H-shaped bracket and the connecting plate.

[0012] The beneficial effects of the utility model are as follows: 1. By coating the surface of the fixture with a protective layer made of Teflon, the entire outer surface of the fixture is protected, so the paint cannot adhere to the surface of the fixture during the spraying process; 2. The surface roughness of the fixture is processed to Ra3.2 before the protective layer is coated, so as to enhance the adhesion between the protective layer and the surface of the fixture body. When a paint layer adheres to the protective layer, the operator cannot separate the protective layer from the surface of the fixture body when using auxiliary tools to remove the paint layer, thereby increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the utility model.

[0014] Figure 2 This is the front view of the second embodiment of the utility model.

[0015] Figure 3 It is an enlarged view of point A of the second embodiment of the present utility model.

[0016] Description of the accompanying figures: 01. fixture body, 02. protective layer, 03. support frame, 04. cross beam, 05. H-shaped bracket, 06. positioning hole, 07. drain outlet, 08. connecting plate, 09. support plate. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] For example, see Figure 1As shown, the utility model relates to a protective structure for the outer surface of a jig, comprising a jig body 01, on the outer surface of which is coated a protective layer 02 made of Teflon. The adhesion between the protective layer 02 and the jig body 01 is greater than the adhesion between the paint layer sprayed on the protective layer 02 and the protective layer 02. Therefore, in order to ensure the adhesion between the protective layer 02 and the surface of the jig body 01. Therefore, before covering the protective layer 02, the roughness of the outer surface of the jig body 01 is Ra3.2.

[0019] Therefore, when the surface roughness of the fixture body 01 is Ra1.6, the protective layer 02 is sprayed on the surface of the fixture body 01. After the protective layer 02 is dried, the thickness of the protective layer 02 is measured by a coating thickness measuring instrument to ensure that the thickness of the protective layer 02 is greater than 30μm. At the same time, the roughness of the outer surface of the protective layer 02 is detected to be Ra0.4-0.8, and then the adhesion of the protective layer 02 is tested by the cross-cut method or the cross-cut method. The test result is 4B grade. That is, it belongs to ISO grade: 1 = ASTM grade: 4B, which means that there are small pieces of paint peeling at the intersection of the incision, and the actual damage in the cross-cut area is less than or equal to 5%. Although the protective layer 02 is made of Teflon. The protective layer 02 has the property of anti-sticking. When the workpiece is placed on the fixture body 01 for spraying, a part of the paint layer will remain on the fixture surface. The operator uses auxiliary tools to remove this part of the paint layer. During the removal process, the protective layer 02 will fall off along with the paint layer on the surface of the protective layer 02. Therefore, when the surface roughness of the fixture body 01 is Ra1.6, covering the protective layer 02 on the surface of the fixture body 01 cannot meet the actual application requirements of the protective layer 02.

[0020] When the surface roughness of the fixture body 01 is Ra3.2, the protective layer 02 is sprayed on the surface of the fixture body 01. After the protective layer 02 is dried, the thickness of the protective layer 02 is measured by a coating thickness gauge to ensure that the thickness of the protective layer 02 is greater than 30μm, and the roughness of the outer surface of the protective layer 02 is detected to be Ra0.4-0.8. Then the adhesion of the protective layer 02 is tested by the cross-cut method or the cross-cut method. The test result is 5B grade. That is, it belongs to ISO grade: 0 = ASTM grade: 5B, which means that there is no peeling on the edge of the grid and the cut edge is completely smooth. Although the protective layer 02 is made of Teflon. The protective layer 02 has the property of anti-sticking. When the workpiece is placed on the fixture body 01 for spraying, a part of the paint layer will remain on the fixture surface. The operator uses auxiliary tools to remove this part of the paint layer. During the removal process, only scratches will be left on the surface of the protective layer 02 without falling off. Therefore, when the surface roughness of the jig body 01 is Ra3.2, covering the surface of the jig body 01 with the protective layer 02 meets the actual application requirements of the protective layer 02 .

[0021] When the surface roughness of the jig body 01 is Ra6.3, the protective layer 02 is sprayed on the surface of the jig body 01. After the protective layer 02 is dried, the thickness of the protective layer 02 is measured by a coating thickness measuring instrument to ensure that the thickness of the protective layer 02 is greater than 30μm. When the surface roughness of the jig body 01 is Ra6.3 and the protective layer 02 is covered, it is observed that the surface of the protective layer 02 has an uneven surface, so the roughness of the outer surface of the protective layer 02 cannot reach Ra0.4-0.8. Therefore, it can be seen that the large surface roughness leads to a reduction in the contact area between the coating and the substrate, thereby affecting the adhesion and thickness of the coating. The adhesion of the protective layer 02 is then tested by the cross-cut method or the cross-cut method. The test result is 3B grade. That is, it belongs to ISO grade: 2 = ASTM grade: 3B, which means that the peeling area of ​​the edge of the cut and the intersection is greater than 5% and less than 15%. Therefore, when the surface roughness of the jig body 01 is Ra6.3, covering the surface of the jig body 01 with the protective layer 02 meets the actual application requirements of the protective layer 02 .

[0022] For example 2, please refer to Figure 2-3As shown, the present application provides a coating jig, including a support frame 03, a cross-shaped beam body 04 is fixedly installed in the middle of the support frame 03 by welding, and an H-shaped bracket 05 is fixedly installed on the cross-shaped beam body 04 by fasteners. The H-shaped bracket 05 is provided with a plurality of positioning holes 06 arranged in an array, and one end of the H-shaped bracket 05 is fixedly connected to a connecting plate 08 by welding, and a plurality of supporting plates 09 are welded on the connecting plate 08, and the supporting plate 09 is welded and connected to the H-shaped bracket 05. The verticality of the H-shaped bracket 05 and the cross-shaped beam body 04 is ensured by the provision of the supporting plate 09. The stability of the H-shaped bracket 05 is ensured. A drainage port 07 connected to the positioning hole 06 is provided at the connection between the H-shaped bracket 05 and the connecting plate 08. The connecting plate 08 is provided with a fixed connection hole, and the H-shaped bracket 05 is fixedly connected to the cross-shaped beam body 04 by fasteners passing through the connecting thread. The outer surfaces of the support frame 03, the cross beam body 04, the H-shaped bracket 05, the positioning holes 06 and the H-shaped bracket 05 are all provided with protective structures. When the workpiece is placed on the H-shaped bracket 05, the workpiece and the sled are transported to the primer pool and the electroplating pool together through the sled conveying system for painting. Since the protective layer 02 is provided on the overall outer surface of the sled and the drainage channel in the H-shaped bracket 05, it is difficult for the primer to adhere to the surface of the protective layer 02 during the process of spraying the primer. Therefore, after the painting is completed, the primer attached to the outer surface of the protective layer 02 can be easily removed by auxiliary tools such as compressed air or a scraper. It should be noted that in this embodiment, the support frame 03, the cross beam body 04 and the H-shaped bracket 05 are all made of metal square tubes of different specifications by welding.

[0023] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0025] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A protective structure for the outer surface of a fixture, comprising a fixture body, characterized in that: The roughness of the outer surface of the fixture body is Ra3.2; the outer surface of the fixture body is coated with a protective layer made of Teflon; the adhesion between the protective layer and the fixture body is greater than the adhesion between the paint layer sprayed on the protective layer and the protective layer.

2. The protective structure for the outer surface of the fixture according to claim 1, characterized in that: The thickness of the protective layer is greater than 30 μm.

3. The protective structure for the outer surface of the fixture according to claim 2, characterized in that: The roughness of the outer surface of the protective layer is Ra0.4-0.

8.

4. A spraying jig, characterized in that: A protective structure for the outer surface of a fixture comprising any one of claims 1-3.

5. The spraying jig according to claim 4, characterized in that: The utility model comprises a support frame, a cross-shaped beam body is fixedly installed in the middle of the support frame, and an H-shaped bracket is fixedly installed on the cross-shaped beam body.

6. The spraying jig according to claim 5, characterized in that: One end of the H-shaped bracket is fixedly connected with a connecting plate, a plurality of supporting plates are welded on the connecting plate, and the supporting plates are welded to the H-shaped bracket.

7. The spraying jig according to claim 6, characterized in that: The H-shaped bracket is provided with a plurality of arranged positioning holes, and a drainage outlet which is through-connected with the positioning holes is provided at the connection between the H-shaped bracket and the connecting plate.

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