Fixture for sealing and enclosing pouring sealant

Abstract

A pouring sealant sealing and enclosing jig comprises a jig base, a jig cover plate and a plurality of jig pressing strips. A sinking cavity used for containing a PCB is formed in the bottom of the jig base, and the side wall of the jig base protrudes inwards to form a supporting edge so as to support the side edge of the PCB. The jig pressing strip comprises a pressing plate part and an elastic part which is arranged on the pressing plate part and makes contact with the PCB in a pressing mode. According to the pouring sealant sealing and enclosing jig provided by the utility model, the elastic part is arranged on the jig pressing strip, and the side wall of the jig base 100 protrudes inwards to form the supporting edge so as to support the side edge of the PCB; the elastic part and the supporting edge are tightly attached to the periphery of the PCB, so that the pouring sealant is sealed on the PCB before being cured and is prevented from flowing out of the PCB, complete sealing can be formed after the jig pressing strip is pressed on the surface of the PCB, and the pouring sealant is guaranteed not to overflow.

Description

Technical Field

[0001] The utility model relates to the field of electronic device sealing, and more specifically, to a potting glue sealing and blocking jig. Background Art

[0002] In order to solve the disadvantages of large dispensing amount, long glue curing time, uneven height of the dam glue, and unsightly dam glue when using the method of dispensing dams, a potting glue sealing and blocking jig is designed to replace the white glue blocking solution. In this solution, the PCB board is placed on the jig, and its four sides are fixed to the jig base by locking screws with pressure bars for potting glue shaping. However, during actual use, it is found that when using this potting glue sealing and blocking jig, the potting glue will overflow before curing, and a thin burr will be formed between the pressure bar and the base after curing in the furnace. The overflow of the potting glue will cause the risk of insufficient potting amount for the whole board, and the cost of manual glue cleaning needs to be increased. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a potting glue sealing and blocking jig, which can form a complete seal after the pressure bar presses on the board surface of the PCB board, thereby ensuring that the potting glue does not overflow.

[0004] The technical solution adopted by the utility model to solve its technical problems is to construct a potting glue sealing and blocking jig, which includes a jig base, a jig cover plate, and a plurality of jig pressure bars; a sinking cavity for accommodating the PCB board is formed at the bottom of the jig base, and a supporting edge protrudes inward from the side wall of the jig base to support the side edge of the PCB board; the jig pressure bar includes a pressing plate portion and an elastic portion provided on the pressing plate portion and pressing against the PCB board.

[0005] In the potting glue sealing and blocking jig of the utility model, the thickness of the sinking cavity is less than the thickness of the PCB board, the supporting edge extends inward so that the contact width between the supporting edge and the PCB board is greater than the first width, and the contact width between the elastic portion and the PCB board is also greater than the first width.

[0006] In the potting glue sealing and blocking jig of the utility model, the thickness difference between the sinking cavity and the PCB board is 0.1 mm to 1.5 mm; the first width is 0.5 mm to 1.5 mm.

[0007] In the potting glue sealing and blocking jig of the utility model, the height of the PCB board is 1.6 mm, the thickness difference between the sinking cavity and the PCB board is 0.3 mm, the first width is 1 mm, and the elastic portion is a silica gel pad.

[0008] In the potting glue sealing and blocking fixture of the present utility model, a pressure strip handle is arranged in the middle of one side of the pressing plate portion facing away from the elastic portion. Sealing portions protruding outwards are arranged on both sides of the pressure strip handle to press and seal the PCB board, and a plurality of screw holes are further evenly arranged on the pressing plate portion.

[0009] In the potting glue sealing and blocking fixture of the present utility model, a plurality of supporting blocks for supporting the PCB board are arranged in the sunken cavity, and a plurality of positioning holes and / or positioning posts for positioning the fixture pressure strip are arranged on the outer periphery of the fixture base.

[0010] In the potting glue sealing and blocking fixture of the present utility model, the outer periphery is a rectangular periphery adapted to the shape of the PCB board, and base handles are respectively arranged on the first side edge and the second side edge which face each other of the rectangular periphery; first buckles are respectively arranged on the third side edge and the fourth side edge which face each other of the rectangular periphery.

[0011] In the potting glue sealing and blocking fixture of the present utility model, second buckles are arranged at positions on the fixture cover plate facing the first buckles, and the first buckles and the second buckles are buckled with each other; a plurality of openings for the protruding devices on the PCB board to pass through are arranged on the fixture cover plate.

[0012] In the potting glue sealing and blocking fixture of the present utility model, a plurality of spring columns for sealing the mounting holes on the PCB board are arranged on one side of the fixture cover plate facing the PCB board.

[0013] When the potting glue sealing and blocking fixture of the present utility model is adopted, an elastic portion is arranged on the fixture pressure strip, and a supporting edge protruding inwards is formed on the side wall of the fixture base to support the side edge of the PCB board. After the fixture pressure strip presses the PCB board tightly, a downward and balanced pressure can be generated. The elastic portion generates a slight deformation under the pressure, and the elastic portion and the supporting edge are respectively in close contact with the four sides of the PCB board, so that the potting glue is sealed on the PCB board before curing, preventing the potting glue from flowing out of the board. Furthermore, after the fixture pressure strip presses on the board surface of the PCB board, a complete seal can be formed, thus ensuring that the potting glue does not overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0015] Figure 1 is a schematic structural diagram of a preferred embodiment of the fixture pressure strip of the potting glue sealing and blocking fixture of the present utility model;

[0016] Figure 2 is a schematic structural diagram of another preferred embodiment of the fixture pressure strip of the potting glue sealing and blocking fixture of the present utility model;

[0017] Figure 3 It is a schematic structural diagram of a preferred embodiment of the fixture base of the potting glue sealing and blocking fixture of the present utility model;

[0018] Figure 4 is Figure 3 A partial structural diagram of the fixture base shown;

[0019] Figure 5 It is a schematic structural diagram of a preferred embodiment of the fixture cover of the potting glue sealing and blocking fixture of the present utility model;

[0020] Figure 6 It is a schematic diagram of the cooperation between the fixture pressing strip and the fixture base of the potting glue sealing and blocking fixture of the present utility model;

[0021] Figure 7 It is a schematic diagram of the cooperation between the fixture pressing strip of the potting glue sealing and blocking fixture of the present utility model and the special-shaped device on the PCB board;

[0022] Figure 8 It is a schematic diagram of the sealing effect of the potting glue sealing and blocking fixture of the present utility model. Detailed implementation manners

[0023] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, 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 only used to explain the present utility model and are not used to limit the present utility model.

[0024] Figure 1 It is a schematic structural diagram of a preferred embodiment of the fixture pressing strip of the potting glue sealing and blocking fixture of the present utility model. Figure 2 It is a schematic structural diagram of another preferred embodiment of the fixture pressing strip of the potting glue sealing and blocking fixture of the present utility model. Figure 3 It is a schematic structural diagram of a preferred embodiment of the fixture base of the potting glue sealing and blocking fixture of the present utility model. Figure 4 is Figure 3 A partial structural diagram of the fixture base shown. Figure 5 It is a schematic structural diagram of a preferred embodiment of the fixture cover of the potting glue sealing and blocking fixture of the present utility model. Combining Figures 1-5 it can be seen that the potting glue sealing and blocking fixture of the present utility model includes a fixture base 100, a fixture cover 200 and a plurality of fixture pressing strips 300. As Figures 3-4 shown, a sunken cavity 110 for accommodating the PCB board is formed at the bottom of the fixture base 100. The sunken cavity 110 can adopt any suitable shape according to the PCB board to be accommodated. A supporting edge 120 protrudes inward from the side wall of the fixture base 100 to support the side edge of the PCB board. As Figure 1As shown, the fixture pressing strip 300 includes a pressing plate portion 310 and an elastic portion 320 disposed on the pressing plate portion 310 and pressing against the PCB board in contact.

[0025] During the use of the existing potting glue sealing and blocking fixture, the inventor found that the material used is a hard material, and the PCB board itself is also a hard material. Therefore, when the fixture pressing strip presses the PCB board, there will be gaps in the double-sided hard contact and it cannot be completely fitted to meet the sealing conditions. In addition, neither the fixture base nor the pressing strip can generate sufficient pressure on the PCB board to fit both sides of the PCB board, resulting in incomplete sealing. Therefore, the potting glue overflows through the gaps before curing. By using the potting glue sealing and blocking fixture of the present invention, an elastic portion 320 is provided on the fixture pressing strip, and a supporting edge 120 is formed by inward protrusion on the side wall of the fixture base 100 to support the side of the PCB board. After the fixture pressing strip presses and compresses the PCB board, a downward and balanced pressure can be generated. The elastic portion 320 undergoes slight deformation under the pressure. The elastic portion 320 and the supporting edge 120 are respectively in close contact with the four sides of the PCB board, so that the potting glue is sealed on the PCB board before curing, preventing the potting glue from flowing out of the board. Furthermore, after the fixture pressing strip presses and contacts the surface of the PCB board, a complete seal can be formed, ensuring that the potting glue does not overflow.

[0026] In a preferred embodiment of the present invention, the pressing plate portion 310 is preferably made of bakelite, with a pressure > 2 kg, and the pressure of the pressing plate portion 310 on the PCB board should be basically balanced. Therefore, it is preferably a rectangular pressing plate with a certain width. The shape of the elastic portion 320 matches that of the pressing plate portion 310, and is preferably a silicone pad that resists glue and is elastic and heat-resistant. After cutting the silicone pad into the shape of the pressing plate portion 310, it can be pasted on the pressing plate portion 310 with high-temperature and high-viscosity glue. After pasting, the side surface of the silicone pad should be flush and smooth with the side surface of the pressing plate portion 310. Of course, in other preferred embodiments of the present invention, elastic portions made of other materials can also be used, as long as they can meet the requirements of having elasticity, being heat-resistant and not deforming, and generating pressure to form a sealing effect after the fixture pressing strip presses and contacts the surface of the PCB board.

[0027] In a preferred embodiment of the present utility model, after the PCB board is installed in the sunken cavity 110 of the jig base 100, in order to make the side wall of the sunken cavity 110 and the periphery of the PCB board, and the pressing plate portion 310 and the periphery of the PCB board generate pressure to form a sealing effect, it is preferred to set the thickness of the sunken cavity 110 to be less than the thickness of the PCB board, extend the supporting edge 120 inward so that the contact width between the supporting edge 120 and the PCB board is greater than the first width, and the elastic portion 320 has a set width so that the contact width between the elastic portion 320 and the PCB board is also greater than the first width. Herein, the thickness, the first width and the second width are preferably determined according to the size of the PCB board, as long as it can satisfy that sufficient pressure is generated between the supporting edge 120, the PCB board and the elastic portion to achieve sealing. Preferably, the difference between the thickness of the sunken cavity 110 and the thickness of the PCB board is 0.1 mm to 1.5 mm; the first width is 0.5 mm to 1.5 mm, and the second width is greater than the first width.

[0028] Taking the most common PCB board with a height of 1.6 mm as an example, the difference between the thickness of the sunken cavity 110 and the thickness of the PCB board is 0.3 mm, and the first width is 1 mm. That is to say, it can be understood that the thickness of the sunken cavity 110 is 1.6 - 0.3 = 1.3 mm; the supporting edge 120 extends inward by 1 mm, so as to ensure that the contact width between the periphery of the jig base and the PCB board is more than 1 mm. The width of the elastic portion 320 is greater than 1 mm, so that after the jig pressing strip presses the PCB board, the width of the contact part is greater than 1 mm. The foregoing dimensions are the preferred values obtained by the inventor through multiple verifications. Those skilled in the art can conduct multiple experiments based on different PCB boards to obtain corresponding data. Herein, the present utility model is not limited by the specific values.

[0029] Furthermore, as Figures 1-2 shown, in a further preferred embodiment of the present utility model, the jig pressing strip 300 further includes a pressing strip handle 350 provided in the middle of the side of the pressing plate portion 310 facing away from the elastic portion 320, which can facilitate the loading and unloading operations. Further as Figure 2 shown, convex sealing portions 340 are provided on both sides of the pressing strip handle 350 to press and seal the PCB board, and further, the cooperation between the special-shaped devices on the PCB board and the jig pressing strip 300 can be realized. This is considering that when there are missing devices at the corners of the PCB board, leakage is likely to occur. At this time, convex sealing portions 340 need to be provided so that the jig pressing strip 300 and the PCB board can achieve sealing. Figure 7It is a schematic diagram of the cooperation between the fixture pressing strip of the potting glue sealing and blocking fixture of the present utility model and the special-shaped device 410 on the PCB board. The fixture pressing strip with a specific structure of the present utility model can achieve a perfect fit with the special-shaped device on the PCB board, thereby achieving sufficient sealing.

[0030] Furthermore, as shown in Figure 2 , a plurality of screw holes 330 are further uniformly arranged on the pressing plate portion 310. Through these screw holes 330, anti-detachment screws can be used to fix the fixture pressing strip 300 on the fixture base 100. Preferably, the number of anti-detachment screws is 4 for each fixture pressing strip 300, and they are distributed at the vulnerable point positions of the fixture pressing strip 300. This can not only fasten the fixture pressing strip 300 to the fixture base 100, making the fixture pressing strip 300 generate a downward pressure to tightly press the edge of the PCB board, but also facilitate fastening and loosening, greatly improving the installation and removal efficiency of the fixture pressing strip. Of course, in other preferred embodiments of the present utility model, the number of the screw holes can be more or less.

[0031] Furthermore, as shown in Figure 3 , a plurality of support blocks 130 for supporting the PCB board are arranged in the sunken cavity 110. A plurality of positioning holes 140 and / or positioning posts 150 for positioning the fixture pressing strip 300 are arranged on the outer periphery of the fixture base 100. The outer periphery is a rectangular periphery adapted to the shape of the PCB board, and base handles 160 are respectively arranged on the first side and the second side of the rectangular periphery facing each other. In order to make the fixture base 100 fit with the bottom of the PCB board, without interfering with the devices, a plurality of support blocks 130 for supporting the PCB board are arranged in the sunken cavity 110, so as to generate an upward pressure and closely adhere to the PCB board. In order to better position the fixture pressing strip 300, a plurality of positioning holes 140 and positioning posts 150 for positioning the fixture pressing strip 300 are arranged on the outer periphery of the fixture base 100, so as to ensure that the fixture pressing strip can accurately press the edge part of the PCB board and make it have space to bear force. In some embodiments of the present utility model, only the positioning holes 140 or the positioning posts 150 can be provided. Figure 6 It is a schematic diagram of the cooperation between the fixture pressing strip and the fixture base of the potting glue sealing and blocking fixture of the present utility model. The fixture pressing strip and the fixture base with a specific structure of the present utility model can achieve a perfect fit, thereby achieving sufficient sealing.

[0032] Furthermore, as shown in Figure 3 and 5As shown, first buckles 170 are respectively arranged on the third side and the fourth side which face each other on the periphery of the rectangle. Second buckles 210 are arranged at positions on the fixture cover plate 200 facing the first buckles 170, and the first buckles 170 and the second buckles 210 are buckled with each other. A plurality of openings 220 for the protruding devices on the PCB board to pass through are arranged on the fixture cover plate 200. Preferably, a plurality of spring posts for sealing the mounting holes on the PCB board are arranged on one side of the fixture cover plate 200 facing the PCB board. This is because the middle mounting holes on the PCB board need to be locked with screws, and the holes in the middle cannot be blocked, so A / B glue cannot be potted and cannot be blocked. Therefore, spring posts are designed on the fixture cover plate 200. The spring posts press the mounting holes so that the A / B glue will not flow into the mounting holes before curing. The part of the spring posts pressing the mounting holes needs to be made of glue-resistant and smooth rubber silicone, so that the A / B glue will not stick to the spring posts after curing.

[0033] Figure 8 is a schematic diagram of the sealing effect of the potting glue sealing and blocking fixture of the present utility model. Using Figures 1~7 the potting glue sealing and blocking fixture shown, it can be realized that the potting glue on the PCB board 400 does not overflow after curing, and the height of the potting glue reaches the process requirements, achieving the potting protection effect. The principle and operation process are described as follows.

[0034] The potting glue sealing and blocking fixture of the present utility model mainly needs to meet the requirements of sealing and preventing leakage. After the fixture pressing strip is locked, it can generate downward and balanced pressure. The elastic part at the lower part of the fixture pressing strip generates slight deformation under the pressure and closely fits around the PCB board surface. After the potting glue is cured, the potting glue should be closely adhered to the PCB board and meet the peel strength requirements. The fixture pressing strip can be easily peeled off from the potting glue, and the side of the elastic part is not stained with the potting glue. At the same time, the silicone rubber can be stably reused about 500 times, and the silicone rubber is convenient to replace in the later stage. The weight of the fixture is as light as possible, and the installation and disassembly of the fixture pressing strip are convenient. Since the viscosity coefficient of the A / B glue is low and the fluidity is good, it is easy to leak before curing. Therefore, the key point of the present utility model is to seal the potting glue on the PCB board surface before curing and prevent the potting glue from flowing out of the board. Based on the above disclosed content, in the present utility model, the thickness of the sinking cavity 110 is set to be less than the thickness of the PCB board, the supporting edge 120 is extended inward so that the contact width between the supporting edge 120 and the PCB board is greater than the first width, and the elastic part 320 has a second width so that the contact width between the elastic part 320 and the PCB board is also greater than the first width. Herein, the thickness, the first width and the second width are preferably determined according to the size of the PCB board. When the A / B glue is cured and shaped, it is necessary to take out the surrounding fixture pressing strips and fixture covers. However, the A / B glue has a certain viscosity and is easily adhered to the fixture surface. When taking it out, it will damage the potting glue structure and the fixture will be adhered with the potting glue. After a series of analyses and verifications, bakelite or fiberglass can be used to construct the fixture pressing strip and the fixture cover. Because accurate positioning is required when installing the fixture pressing strip, the fixture base has positioning posts for positioning the fixture pressing strip. For the convenience of installation and removal, a handle is installed on the fixture pressing strip to facilitate the installation and removal operation. At the same time, in order to facilitate the fastening and loosening of the fixture pressing strip, anti-drop screws are installed on the fixture pressing strip, which greatly improves the installation and removal efficiency of the fixture pressing strip.

[0035] Specifically, the specific use process of the potting glue sealing and blocking fixture of the present utility model is as follows.

[0036] Place the tested PCB board stably into the fixture base; apply the primer on the other sides of the PCB board except the side of the air duct opening, and install multiple fixture pressing strips corresponding to the marks on the fixture base and align them with the positioning posts on the fixture base; use an electric screwdriver to lock the screws to fasten the fixture pressing strips on the fixture base; press and buckle the fixture cover on the fixture base; place the fixture into the track, and after the glue filling machine adjusts the glue filling stroke, fill the PCB board with glue, and the glue filling requirements remain unchanged; take out the fixture and place it properly after passing through the curing furnace; loosen the buckle of the fixture cover and take it out of the fixture; use an electric screwdriver to loosen the screws on the fixture pressing strip and then lift the handle to take out the fixture pressing strip. Take out the PCB board from the base. Through the above process operations, it can be realized that the potting glue does not overflow after curing, the height of the potting glue reaches the process requirements, and the potting protection effect is achieved.

[0037] Although the present utility model is illustrated by specific embodiments, those skilled in the art should understand that various transformations and equivalent substitutions can be made to the present utility model without departing from its scope. Additionally, for specific situations or materials, various modifications can be made to the present utility model without departing from its scope. Therefore, the present utility model is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims of the present utility model.

[0038] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall all be included within the protection scope of the present utility model.

Claims

1. A potting adhesive sealing and blocking fixture, characterized in that It includes a fixture base, a fixture cover plate and a plurality of fixture pressing strips; a sunken cavity for accommodating a PCB board is formed at the bottom of the fixture base, and a supporting edge protruding inwards is formed on the side wall of the fixture base to support the side edge of the PCB board; the fixture pressing strip includes a pressing plate part and an elastic part arranged on the pressing plate part and pressing against the PCB board.

2. The potting glue sealing and blocking fixture according to claim 1, wherein The thickness of the sunken cavity is less than the thickness of the PCB board, the supporting edge extends inwards so that the contact width between the supporting edge and the PCB board is greater than a first width, and the contact width between the elastic part and the PCB board is also greater than the first width.

3. The potting adhesive sealing and blocking fixture according to claim 2, wherein, The thickness difference between the sunken cavity and the PCB board is 0.1 mm to 1.5 mm; the first width is 0.5 mm to 1.5 mm.

4. The potting adhesive sealing and blocking fixture according to claim 3, characterized in that, The height of the PCB board is 1.6 mm, the thickness difference between the sunken cavity and the PCB board is 0.3 mm, the first width is 1 mm, and the elastic part is a silica gel pad.

5. The potting glue sealing and blocking jig according to any one of claims 1 to 4, characterized in that, A pressing strip handle is arranged in the middle of the side of the pressing plate part facing away from the elastic part, protruding sealing parts are arranged on both sides of the pressing strip handle to press and seal the PCB board, and a plurality of screw holes are further uniformly arranged on the pressing plate part.

6. The potting adhesive sealing and blocking fixture according to claim 5, wherein A plurality of supporting blocks for lifting the PCB board are arranged in the sunken cavity, and a plurality of positioning holes and / or positioning posts for positioning the fixture pressing strips are arranged on the outer periphery of the fixture base.

7. The potting glue sealing and blocking fixture according to claim 6, characterized in that, The outer periphery is a rectangular periphery adapted to the shape of the PCB board, and base handles are respectively arranged on the first side edge and the second side edge facing each other of the rectangular periphery; first buckles are respectively arranged on the third side edge and the fourth side edge facing each other of the rectangular periphery.

8. The potting adhesive sealing and blocking fixture according to claim 7, characterized in that, Second buckles are arranged on the fixture cover plate at positions facing the first buckles, and the first buckles and the second buckles are buckled with each other; a plurality of openings for the protruding devices on the PCB board to pass through are arranged on the fixture cover plate.

9. The potting adhesive sealing and blocking fixture according to claim 8, wherein A plurality of spring columns for sealing the mounting holes on the PCB board are arranged on the side of the fixture cover plate facing the PCB board.

Images