Shielding structure for powder spraying
The problem of high cost of spraying fixture before powder spraying of metal shells by RFID RF receiving equipment is solved through the contour shielding structure, and an efficient and low-cost powder spraying process is realized, adapting to metal shells of different shapes, simplifying the process, and improving powder spraying flexibility.
Patent Information
- Application Number
- CN202422335384.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-25
AI Technical Summary
In the prior art, the metal shell of the RFID radio frequency receiving device requires a special spray jig before powdering, resulting in high cost, long cycle and unsuitable for powder spraying requirements of small batch and non-planar workpieces.
The shielding structure is adopted, including a shielding layer, an adhesive layer and a tear layer, and the appearance is profiled and molded in one piece. Positioning is used to simplify the powder spraying process and avoid the use of fixtures.
It improves production efficiency, reduces costs, adapts to metal shells of different shapes, has strong adaptability, simplifies the modification of the coverage of spraying, reduces the process, and improves the flexibility of powder spraying.
Smart Images
Figure CN223209681U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a processing technology for RFID radio frequency receiving equipment, and in particular to a shielding structure for powder spraying, which is used to shield the metal shell of the RFID radio frequency receiving equipment. Background Art
[0002] The metal shell of RFID radio frequency receiving equipment is generally produced by machining and die-casting. Due to the needs of appearance and corrosion resistance, surface treatment such as powder spraying is required. However, the inside of the metal shell needs to be equipped with a circuit board, and the circuit board and the metal shell need to be well grounded, so powder spraying is not required inside. In addition, some metal shells also need to be equipped with a waterproof ring on the inner side. In this case, the metal shell must be masked before powder spraying to prevent the metal shell from being sprayed with powder in the area that does not need to be powdered during the electrostatic powder spraying process, resulting in the need for subsequent laser engraving or CNC to remove the powder. Masking the inside of the metal shell before powder spraying saves manpower and shortens the process and overall processing time.
[0003] Existing technology requires the development of a dedicated masking fixture, typically made of metal such as steel. The fixture is installed on the product, protecting the masked surface from contamination by the spray powder. To ensure effective masking, the fixture requires high dimensional accuracy, requiring wire cutting or CNC machining. This makes the masking fixture expensive, and the production and verification cycle lengthy. This makes it unsuitable for verifying small batches of powder coating applications, nor for covering a variety of non-planar workpieces. Utility Model Content
[0004] The present application provides a shielding structure for powder spraying in order to improve the universality and flexibility of modifying the coverage range of the shielding.
[0005] According to the present application, one embodiment provides a powder spraying shielding structure for shielding a metal shell of an RFID radio frequency receiving device, comprising a positioning member and a shielding member, wherein the shielding member comprises a shielding layer, an adhesive layer, and a tear-off layer arranged in sequence, and the shielding member is integrally formed in the shape of the metal shell, and the positioning member is used to position the shielding member and the metal shell;
[0006] The tearing layer is used to protect the adhesion layer and is torn off before shielding. The adhesion layer is used to adhere to one side of the inner cavity of the metal shell. The shielding layer is used to isolate the outer surface and the inner cavity of the metal shell.
[0007] In another embodiment, the shielding layer includes a high temperature resistant adhesive tape layer.
[0008] In another embodiment, the shielding layer includes a metal thin film layer.
[0009] In another embodiment, the adhesive layer includes a high temperature resistant adhesive layer.
[0010] In another embodiment, the tear-off layer includes a release paper layer.
[0011] In another embodiment, a transition zone is provided between the shielding member and the outer surface of the metal shell to limit the whitening of the metal shell during powder spraying.
[0012] In another embodiment, the transition zone width is 0.3 mm.
[0013] In another embodiment, the positioning member includes at least two positioning posts, and the positioning posts are arranged on the end surface of the metal shell. Positioning holes for the positioning posts to pass through for positioning are formed at corresponding positions of the adhesive layer.
[0014] In another embodiment, the number of the positioning posts is four.
[0015] In another embodiment, the positioning column is inserted into a mounting hole that has been processed in the metal shell.
[0016] According to the shielding structure for powder spraying in the above-mentioned embodiment, the shielding layer, adhesive layer and tear-off layer are sequentially arranged and integrally formed in the shape of the metal shell to form a shape-matching shielding structure of the metal shell. When in use, the tear-off layer is first removed to expose the adhesive layer, and then the metal shell, the shielding layer and the adhesive layer are positioned by the shape positioning and positioning parts, so that the shielding layer and the adhesive layer are attached to the end face on one side of the inner cavity of the metal shell to protect the inner surface of the metal shell from being affected during powder spraying; after powder spraying and baking, the attached shielding layer and adhesive layer are torn off. The shielding part is easy to process as a whole, and it is also easy to adhere and remove the shielding part. It is simple and quick, which improves the production efficiency for mass-produced workpieces. For small-volume experimental workpieces, metal shells of different shapes can be quickly processed according to their 3D structures, which is easy to modify and has extremely low cost, thereby improving the universality and flexibility of modifying the shielding coverage range. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic diagram of a structure with a sprayed metal shell in one embodiment;
[0018] Figure 2 A schematic diagram of the assembly of a shielding structure for spraying in one embodiment;
[0019] Figure 3 for Figure 2 Exploded view along the metal shell along the shielding fitting direction;
[0020] Figure 4 This is a schematic structural diagram of a transition zone in one embodiment;
[0021] Figure 5 1 is an exploded view of the shielding member along the shielding fitting direction in one embodiment.
[0022] Figure numerals: 1, metal shell; 11, mounting hole; 2, positioning piece; 21, positioning column; 22, positioning hole; 3, shielding piece; 31, shielding layer; 32, adhesion layer; 33, tearing layer; 4, transition zone. DETAILED DESCRIPTION
[0023] The present application is further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.
[0024] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various implementations, and the operational steps involved in each embodiment may be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing a particular embodiment and do not imply a required composition and / or sequence.
[0025] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).
[0026] The metal shell 1 of the RFID radio frequency receiving device is generally produced by machining and die-casting. Due to the needs of appearance and corrosion resistance, surface treatment such as powder spraying is required. However, a circuit board needs to be installed inside the metal shell 1, and the circuit board and the metal shell 1 need to be well grounded, so powder spraying is not required inside. In addition, some metal shells 1 also need to be equipped with a waterproof ring on the inner side. In this case, the metal shell 1 must be masked before powder spraying to prevent the metal shell 1 from being sprayed with powder in the area that does not need to be powdered during the electrostatic powder spraying process, which will require subsequent laser engraving or CNC to remove the powder. Masking the inside of the metal shell 1 before powder spraying saves manpower and shortens the process and overall processing time.
[0027] Existing technology requires the development of a dedicated masking fixture, typically made of metal such as steel. The fixture is installed on the product, protecting the masked surface from contamination by the spray powder. To ensure effective masking, the fixture requires high dimensional accuracy, requiring wire cutting or CNC machining. This makes the masking fixture expensive, and the production and verification cycle lengthy. This makes it unsuitable for verifying small batches of powder coating applications, nor for covering a variety of non-planar workpieces.
[0028] Please refer to Figure 1 The outer surface of the metal shell 1 is to be powder-sprayed and baked, the inner cavity of the metal shell 1 needs to be shielded, and the metal shell 1 is provided with a plurality of mounting holes 11 for docking and mounting with other shells, and the mounting holes 11 are set as through holes.
[0029] The present application provides a shielding structure for powder spraying, which is used to shield the metal shell 1 of an RFID radio frequency receiving device, so as to improve the universality and flexibility of modifying the shielding coverage range.
[0030] Please refer to Figure 2 and Figure 3 In one embodiment, a shielding structure for powder spraying is provided, which is used to shield the metal shell 1 of an RFID radio frequency receiving device, including a positioning member 2 and a shielding member 3. The shielding member 3 includes a shielding layer 31, an adhesive layer 32 and a tearing layer 33 arranged in sequence. The shielding layer 31 and the tearing layer 33 are attached to both sides of the adhesive layer 32, and the outer shape of the shielding member 3 is integrally formed based on the outer shape of the metal shell 1. The positioning member 2 is used to position the shielding member 3 and the metal shell 1; the tearing layer 33 is used to protect the adhesive layer 32 and is torn off before shielding. The adhesive layer 32 is used to adhere to one side of the inner cavity of the metal shell 1, and the shielding layer 31 is used to isolate the outer surface and the inner cavity of the metal shell 1.
[0031] In the embodiment of the present application, the shielding layer 31, the adhesive layer 32, and the tearing layer 33 are sequentially arranged and integrally formed in the shape of the metal shell 1 to form a contoured shielding structure of the metal shell 1. When in use, the tearing layer 33 is first removed to expose the adhesive layer 32, and then the metal shell 1 and the shielding layer 31 and the adhesive layer 32 are positioned using the shape positioning and positioning member 2, thereby affixing the shielding layer 31 and the adhesive layer 32 to the end face on one side of the inner cavity of the metal shell 1 so that the inner surface of the metal shell 1 is not involved during powder spraying; after powder spraying and baking, the attached shielding layer 31 and the adhesive layer 32 are torn off. The shielding member 3 is easy to process as a whole, and it is also easy to adhere and remove the shielding member 3, which is simple and quick. This improves production efficiency for mass-produced workpieces. For small-volume experimental workpieces, metal shells 1 of different shapes can be quickly processed according to their 3D structures, which is easy to modify and has extremely low cost, thereby improving universality and flexibility in modifying the shielding coverage range.
[0032] Furthermore, in this embodiment of the present application, the shielding member 3 is laser cut or automatically cut to create a contoured shielding structure that matches the shielding range of the metal shell 1, and the shielding member 3 and the metal shell 1 can be positioned relative to each other. The shielding member 3 is powder-coated and baked together with the metal shell 1. Therefore, in this embodiment of the present application, both the shielding layer 31 and the adhesive layer 32 are made of high-temperature resistant materials.
[0033] In one embodiment, please refer to Figure 2 and Figure 3 Shielding layer 31 comprises a high-temperature-resistant adhesive tape layer, adhesive layer 32 comprises a high-temperature-resistant adhesive layer, and tear-off layer 33 comprises a release paper layer. In another embodiment, shielding layer 31 comprises a metal film layer, adhesive layer 32 comprises a high-temperature-resistant adhesive layer, and tear-off layer 33 comprises a release paper layer. Shielding member 3 is a metal foil with adhesive, such as copper foil or tin foil. The material of shielding layer 31 is selected based on the shape of the end face to which metal shell 1 is to be bonded, resulting in greater adaptability and a more stable bonding effect.
[0034] In the present application, on the one hand, a metal foil (copper foil or tin foil) with glue, or a high-temperature resistant adhesive tape is used to cut out the position that needs to be masked according to the 3D drawing of the product using a laser or an automatic cutter. Compared with the solution of using a customized fixture for masking, it is simple, fast, low-cost, and easy to modify. In addition, the connection between the masking layer and the workpiece is a high-temperature resistant adhesive, which is simple and convenient to fit, and easy to design and implement. On the other hand, the high-temperature adhesive tape layer is suitable for flat-surface masking, and the metal film layer with glue (such as copper foil or tin foil) is suitable for flat and curved surface masking, which has a better contour masking effect on the metal shell 1 to be powder-sprayed, and the metal film layer has the same electrostatic adsorption effect as hardware, which improves the uniformity of the powder particles attracted to the interface of the powder spraying mask.
[0035] Furthermore, each piece of the spray shielding material of this embodiment is disposable and dimensionally stable, preventing deformation from repeated use and preventing the metal spray shielding fixture from thinning due to repeated powder removal and reuse. The shielding member 3 is formed entirely by laser cutting or automatic cutting tools, simplifying waste material recycling and eliminating wastewater generation. If metal foil is used as the spray shielding material of this embodiment, it can withstand secondary rework, powder spraying, and baking, ensuring a stable spray shielding range, uniform electrostatic adsorption, and no powder accumulation on the decomposed surface.
[0036] In another embodiment, please refer to Figure 2 and Figure 4A transition zone 4 is provided between the shielding member 3 and the outer surface of the metal shell 1 to limit the white exposure of the metal shell 1 during powder spraying. Furthermore, the width of the transition zone 4 is 0.3 mm. Specifically, in the embodiment of the present application, the transition zone 4 is the area where the edge of the high-temperature resistant adhesive tape layer or the metal film layer is retracted by 0.3 mm after being affixed, which is equivalent to the shielding range of the shielded side end face of the metal shell 1 being retracted by 0.3 mm, so that the outer surface of the metal shell 1 is completely sprayed and colored, which can effectively avoid the white exposure of the side (exposing the metal color) and affecting the appearance effect, and is completed in one time without the need for laser engraving and powder removal.
[0037] In another embodiment, please refer to Figure 2 and Figure 5 The positioning member 2 includes at least two positioning posts 21, which are arranged on the end surface of the metal shell 1. Specifically, the positioning posts 21 are passed through the positions of the mounting holes 11 that have been processed in the metal shell 1. In this embodiment, four positioning posts 21 are provided, which can also be selected according to the specific number and position of the mounting holes 11 on the metal shell 1. No additional structure needs to be designed, and the original structure and appearance of the metal shell 1 are not affected. The corresponding positions of the shielding member 3 are cooperated with positioning holes 22 for the positioning posts 21 to pass through for positioning. The positioning holes 22 are integrally formed with the outer shape of the shielding member 3, and the corresponding positioning of the positioning holes 22 and the positioning posts 21 can quickly position the metal shell 1 and the shielding member 3, and quickly position and fit them according to the outer shape to avoid translation of the shielding member 3 affecting the fitting accuracy.
[0038] When using the powder spraying shielding structure, tear off the release paper layer in the three-layer shielding structure, and put the adhesive layer 32 on the positioning column 21 position of the shielding surface of the metal shell 1 to be shielded corresponding to the positioning hole 22 and the shape, and press down to firmly fit the shielding layer and the workpiece. The shielding layer completely seals the shielding area. After the metal shell 1 completes the powder spraying and baking operation, tear off the shielding layer.
[0039] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.
Claims
1. A powder spraying shielding structure for shielding a metal shell (1) of an RFID radio frequency receiving device, characterized in that: The shielding member (3) comprises a positioning member (2) and a shielding member (3), wherein the shielding member (3) comprises a shielding layer (31), an adhesive layer (32) and a tearing layer (33) arranged in sequence, and the outer shape of the shielding member (3) is integrally formed by imitating the outer shape of the metal shell (1), and the positioning member (2) is used to position the shielding member (3) and the metal shell (1); The tear-off layer (33) is used to protect the adhesive layer (32) and is torn off before shielding; the adhesive layer (32) is used to adhere to one side of the inner cavity of the metal shell (1); and the shielding layer (31) is used to isolate the outer surface and the inner cavity of the metal shell (1).
2. The dust spraying shielding structure according to claim 1, wherein: The shielding layer (31) comprises a high-temperature resistant adhesive paper layer.
3. The dust spraying shielding structure according to claim 1, wherein: The shielding layer (31) comprises a metal thin film layer.
4. The dust spraying shielding structure according to claim 1, wherein: The adhesive layer (32) comprises a high-temperature resistant adhesive layer.
5. The dust spraying shielding structure according to claim 1, wherein: The tear-off layer (33) comprises a release paper layer.
6. The dust spraying shielding structure according to claim 1, wherein: A transition zone (4) is provided between the shielding member (3) and the outer surface of the metal shell (1) to limit the whitening of the metal shell (1) during powder spraying.
7. The dust spraying shielding structure according to claim 6, wherein: The width of the transition zone (4) is 0.3 mm.
8. The dust spraying shielding structure according to claim 1, wherein: The positioning member (2) comprises at least two positioning posts (21), the positioning posts (21) being arranged on the end face of the metal shell (1), and the adhesive layer (32) is provided with positioning holes (22) at corresponding positions for the positioning posts (21) to pass through for positioning.
9. The dust spraying shielding structure according to claim 8, wherein: The number of the positioning columns (21) is four.
10. The dust spraying shielding structure according to claim 8, wherein: The positioning column (21) is arranged through the position of the machined mounting hole (11) of the metal shell (1).