A shielding jig for graphic card finger of gold applied to three-proof paint spraying

Abstract

The utility model belongs to the field of display card production technology, provide a kind of application in three-proof paint spraying's display card gold finger shielding fixture, including metal frame, the metal frame middle is the triangular portion of top opening, both sides are the wing plate integrally formed with triangular portion top edge, the triangular portion is provided with matching triangular rubber strip, the triangular rubber strip top is inwards along length direction and is opened with the fine groove of penetration. Through the double-layer structure of "external support+internal buffering" that jig overall adopts, external support material selects metal material, internal buffering material selects rubber material, jig can be tightly pressed in the surface of display card gold finger to prevent three-proof paint from penetrating into gold finger, simultaneously have the characteristics of adapting multiple sizes display card and can be repeatedly used.

Description

Technical Field

[0001] This utility model belongs to the field of graphics card manufacturing technology, and in particular relates to a graphics card gold finger masking fixture used in conformal coating. Background Technology

[0002] To improve the stability of graphics cards in complex environments and extend their lifespan, they are typically coated with conformal coating to provide moisture, dust, and corrosion protection. The gold fingers of the graphics card are the core components that enable the physical connection and data / power transmission between the graphics card and the motherboard; they must not come into contact with conformal coating. If the gold fingers become contaminated with conformal coating, the following problems will occur:

[0003] First, it blocks the conductive path, causing signal transmission interruption and connection failure, ultimately preventing the graphics card from working properly. Second, it affects the smoothness of insertion and removal of the gold fingers and the motherboard slot, and the curing of the conformal coating may change the size of the gold fingers, compromising their matching accuracy with the slot. In addition, it hinders the effective contact between the test probes and the gold fingers during the repair process, increasing the difficulty of fault detection.

[0004] In the production of conformal coatings for graphics cards, a combination of "spraying + masking" is commonly used. Masking methods include tape, rubber, and specialized masking fixtures. For example, patent CN211099696U discloses a PCBA conformal protection fixture structure that covers components with upper and lower protective covers. However, the size and shape of the covers must be strictly adapted to the structure of the components to be protected, resulting in poor versatility and an inability to meet diverse masking needs. Another example is patent CN115767943A, which discloses a method for conformal coating protection of non-sealed components and the resulting protective layer. This method mainly targets the lead areas and / or solder joint areas of non-sealed components, but its design and application scenarios do not involve the graphics card's gold fingers, thus failing to meet the masking requirements for the gold fingers. Furthermore, patent CN115460791A discloses a masking method for spraying conformal coating, using polyvinylidene fluoride heat shrink tubing as a protective sleeve. This type of protective sleeve is a non-recyclable consumable and requires heat shrinking with a hot air gun, resulting in low efficiency and high cost, making it unsuitable for mass-produced printed circuit boards. In addition, patent CN102123564A discloses a masking method for applying conformal coating to circuit boards, using a masking sleeve that must be strictly matched to the protected area of ​​a specific model of circuit board. This method can only accommodate devices with a single structure and size, failing to meet diverse needs.

[0005] Therefore, it is evident that existing masking solutions suffer from poor versatility, weak adaptability to mass production, and inability to be reused. Utility Model Content

[0006] In view of the above problems, the purpose of this utility model is to provide a graphics card gold finger masking fixture for conformal coating, which aims to solve the technical problems of poor universality, weak adaptability to mass production and inability to be reused in existing masking solutions.

[0007] The present invention adopts the following technical solution:

[0008] The graphics card gold finger masking fixture used for conformal coating includes a metal frame. The metal frame has a triangular part with an open top in the middle and wing plates integrally formed with the top edge of the triangular part on both sides. A matching triangular rubber strip is provided inside the triangular part, and a fine groove is opened through the top of the triangular rubber strip along its length.

[0009] Furthermore, the triangular portion and the wing plate form a connecting portion, and a shallow groove is formed downward at the middle position of the connecting portion, through which the triangular rubber strip protrudes.

[0010] Furthermore, a number of ribs are formed between the back surface of the wing plate and the side wall of the triangular portion.

[0011] Furthermore, two long grooves are formed at the bottom central axis of the triangular part, and a convex strip is formed at the bottom of the triangular rubber strip directly opposite the long groove, with the convex strip located in the corresponding long groove.

[0012] Furthermore, the thickness of the protrusion is less than the thickness of the groove. The beneficial effects of this utility model are: ensuring that the fixture can be tightly pressed against the surface of the graphics card to prevent the conformal coating from seeping into the gold fingers, while also having the characteristics of being compatible with graphics cards of various sizes and being reusable.

[0013] The present invention has the following specific beneficial effects:

[0014] 1. Reusable and suitable for mass production. The external metal frame is structurally stable and not easily deformed over long-term use; moreover, the metal frame and internal triangular rubber strips are resistant to chemical corrosion and will not be damaged by conformal coating. It eliminates the need for frequent fixture changes, meeting the demands of high efficiency and low cost in mass production.

[0015] 2. High versatility, adaptable to various gold finger sizes. The jig's length design covers most gold finger lengths on the market, eliminating the need for repeated customization based on the gold finger lengths of different products. A single jig can adapt to mainstream graphics card models, significantly improving usage efficiency. Attached Figure Description

[0016] Figure 1 This utility model provides a three-dimensional graphics card gold finger masking fixture. Figure 1 .

[0017] Figure 2 This utility model provides a three-dimensional graphics card gold finger masking fixture. Figure 2 .

[0018] Figure 3 This is a cross-sectional view of the graphics card gold finger shielding fixture provided by this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model patent clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0020] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0021] For ease of explanation, only the parts relevant to the embodiments of this utility model are shown.

[0022] Combination Figure 1-3 As shown, the graphics card gold finger masking fixture used for conformal coating includes a metal frame. The metal frame has a triangular part 1 with an open top in the middle and wing plates 2 integrally formed with the top edge of the triangular part on both sides. A matching triangular rubber strip 3 is provided inside the triangular part 1. A through groove 31 is opened inward along the length direction at the top of the triangular rubber strip 3.

[0023] The structural features of this fixture are as follows: it adopts a double-layer structure of "external support + internal buffer". The external support material is made of metal, i.e., a metal frame, to ensure structural strength and stability and prevent deformation during long-term use; the internal buffer material is made of rubber, with triangular rubber strips ensuring both strength and sealing. Both the metal and rubber materials are resistant to chemical corrosion, preventing them from being dissolved, swollen, or penetrated by the conformal coating, and they do not react chemically with the conformal coating, nor do they adversely affect the coating performance.

[0024] The width of wing plate 2 is greater than the width of triangular part 1, and several ribs 23 are formed between the back of wing plate 2 and the side wall of triangular part 1. This structure adopts an external support structure designed with the lever principle to achieve uniform pressure, facilitate operation, and ensure a tight fit between the fixture and the surface of the graphics card. In the initial state, under the force of the metal frame, the top of the groove of the triangular rubber strip is closed. When the graphics card needs to be sprayed with conformal coating, simply press the ends of the two wing plates simultaneously by hand to open the opening of the metal frame, and the opening of the groove will naturally open. Then, insert the gold finger part of the graphics card into the groove. Since the material of the triangular rubber strip is cushioning rubber, the rubber strip makes flexible contact with the surface of the gold finger, which can avoid damage to the gold finger and also prevent the conformal coating from penetrating into the gold finger.

[0025] Furthermore, due to the need for chemical corrosion resistance, the triangular rubber strip cannot be made of very soft silicone. Although the triangular rubber strip has a certain degree of flexibility, it still has a certain degree of hardness compared to silicone. Therefore, when the triangular rubber strip clamps the gold finger, the top of the slits on both sides of the gold finger remains open. During the application of conformal coating, a small amount of conformal coating may still enter from the top of the slits on both sides, potentially contaminating the gold finger. In this structure, the triangular part 1 and the wing plate 2 are connected by a connecting part 21. A shallow groove 22 is formed downwards in the middle of the connecting part 21, and the triangular rubber strip 3 protrudes from the shallow groove 22. In this structure, when the gold finger is clamped, the rubber strip at the gold finger will deform slightly towards the shallow grooves 22 on both sides. Under the clamping force, the top of the grooves on both sides of the gold finger will close. This ensures that during the painting process, the paint will enter from the top of the grooves on both sides of the gold finger, guaranteeing a sealing effect.

[0026] Furthermore, two long grooves 11 are formed at the bottom central axis of the triangular part 1, and a protrusion 32 is formed at the bottom of the triangular rubber strip 3 directly opposite the long groove 11, with the protrusion 32 located within the corresponding long groove 11. Preferably, the thickness of the protrusion 32 is less than the thickness of the long groove 11. If the metal frame is made of metal, the two long grooves at the bottom of the triangular part facilitate the operation of pressing the wing plate. Simultaneously, when installing the triangular rubber strip 3, first press the wing plate, then push the triangular rubber strip into the triangular part from the side until it reaches the appropriate position (the length of the triangular rubber strip is consistent with the length of the metal frame; once both ends are aligned, it can be considered to be in place). At this point, the protrusion falls into the long groove, and then the wing plate can be released. In subsequent operations, the triangular rubber strip will not move back and forth due to the limiting effect of the protrusion, ensuring stability.

[0027] In summary, this fixture adopts an external metal frame and an internal rubber strip structure. The entire external support structure is designed based on the lever principle. The metal frame has restoring force, and the triangular rubber strip can apply uniform pressure to the gold finger part of the graphics card to ensure that the fixture is tightly pressed against the surface of the gold finger of the graphics card, thereby achieving a seal and shielding of the gold finger and preventing the conformal coating from seeping in.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A graphics card gold finger masking fixture used in conformal coating, characterized in that: The device includes a metal frame, which has a triangular section with an open top in the middle and wing plates integrally formed with the top edge of the triangular section on both sides. A matching triangular rubber strip is provided inside the triangular section, and a fine groove is opened through the top of the triangular rubber strip along its length.

2. The graphics card gold finger masking fixture as described in claim 1, characterized in that: The triangular part and the wing plate are connected. A shallow groove is formed downward at the middle position of the connecting part, and the triangular rubber strip is exposed in the shallow groove.

3. The graphics card gold finger masking fixture as described in claim 2, characterized in that: Several ribs are formed between the back of the wing plate and the side wall of the triangular portion.

4. The graphics card gold finger masking fixture for conformal coating as described in claim 3, characterized in that: Two long grooves are formed at the bottom center of the triangular part, and a convex strip is formed at the bottom of the triangular rubber strip opposite the long groove, with the convex strip located in the corresponding long groove.

5. The graphics card gold finger masking fixture as described in claim 4, characterized in that: The thickness of the convex strip is less than the thickness of the long groove.

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