Vacuum debubblizer for patches

Abstract

The utility model discloses a vacuum defoaming machine for patch, relates to patch technical field, solves the problem of positioning deviation, hydraulic pressure rod interference and incomplete cover of pressure plate when patch defoaming. It includes vacuum defoaming cabin, conveying board, hydraulic pressure assembly and vacuum pump, the side wall of vacuum defoaming cabin is equipped with cabin door, and the side of adjacent cabin door is equipped with the first hydraulic pressure rod with first baffle, the inner wall of cabin door is equipped with U-shaped extruding block with U-shaped silica gel pad layer (including circular truncated cone convex point, PTFE coating), and the side wall of cabin door is equipped with storage cavity, conveying board is slidably connected with the bottom wall in defoaming cabin, and the end away from cabin door is equipped with L-shaped baffle, and the end close to cabin door is equipped with second hydraulic pressure rod with second baffle, and the end of conveying board is equipped with limit block, and hydraulic pressure assembly contains pressurizing hydraulic pressure rod and pressure plate, and vacuum pump is connected with defoaming cabin through hose and is equipped with pressure gauge. The utility model guarantees the stable positioning of patch when defoaming, improves defoaming quality and production efficiency, and is suitable for the vacuum defoaming process of electronic component patching deviation process.

Description

Technical Field

[0001] This utility model relates to the field of patch technology, and in particular to a vacuum degassing machine for patch application. Background Technology

[0002] In the surface mount technology (SMT) process of optoelectronic device manufacturing, the vacuum degassing process is a key step to ensure the bonding quality between the SMT and the substrate. After the SMT is bonded to the substrate (such as liquid crystal or cover glass substrate), air bubbles are easily left on the bonding surface. If they are not removed in time, they can lead to problems such as poor light transmittance (such as display panels) or the bonding layer falling off in subsequent products. Therefore, it is necessary to remove the bubbles in a high vacuum environment using a vacuum degassing machine.

[0003] Existing vacuum degassing machines still have significant limitations in practical use: the limiting structure between the conveyor plate and the degassing chamber is not perfect. After the door is closed, the conveyor plate is prone to shifting due to the airflow impact during vacuum pumping or the pressure transmission during pressurization, which causes the patch to shift. Consequently, the pressure plate cannot act evenly on the bonding surface, resulting in residual bubbles at the edges. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum degassing machine for patch mounting, so as to solve the problem of patch misalignment during the vacuum degassing process.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A vacuum degassing machine for patch mounting includes a vacuum degassing chamber, a conveyor plate, a hydraulic pressurization assembly, and a vacuum pump; the side wall of the vacuum degassing chamber is provided with a door, and a first hydraulic rod is provided on the side of the vacuum degassing chamber adjacent to the door, and a first baffle is provided at the piston rod end of the first hydraulic rod;

[0007] The inner wall of the hatch is equipped with a U-shaped extrusion block, and a U-shaped silicone pad is provided on the inner side of the U-shaped extrusion block. The surface of the U-shaped silicone pad is provided with multiple frustum-shaped protrusions, and the inner wall of the U-shaped silicone pad is coated with a PTFE coating.

[0008] The conveying plate is slidably connected to the bottom wall of the vacuum degassing chamber; an L-shaped baffle is provided at the end of the conveying plate away from the chamber door, and a second hydraulic rod is provided at the end near the chamber door, with a second baffle provided at the piston rod end of the second hydraulic rod; a receiving cavity for receiving the second hydraulic rod is provided on the side wall of the chamber door; a limit block is provided at the end of the conveying plate near the U-shaped extrusion block;

[0009] The hydraulic pressurization assembly includes a pressurizing hydraulic rod and a pressure plate; the pressurizing hydraulic rod is installed on the top of the vacuum degassing chamber, and the pressure plate is located at the bottom of the pressurizing hydraulic rod;

[0010] The vacuum pump is connected to the vacuum pump interface of the vacuum degassing chamber via a hose, and a pressure gauge is installed on the vacuum pump.

[0011] Preferably, the U-shaped extrusion block is made of nylon; the thickness of the U-shaped silicone pad is 1.5-2mm; the upper diameter of the frustum-shaped protrusion is 0.6-0.8mm, the lower diameter is 1.0-1.2mm, and the height is 0.6-0.8mm; the thickness of the PTFE coating on the inner wall of the U-shaped silicone pad is 0.1-0.2mm.

[0012] Preferably, the bottom end of the conveyor plate is provided with multiple T-shaped sliders, and the inner bottom wall of the vacuum degassing chamber is provided with a T-shaped groove that slides in cooperation with the T-shaped sliders.

[0013] Preferably, a 5-8mm thick silicone pad is provided at the end of the T-shaped groove away from the hatch.

[0014] Preferably, the first baffle, the second baffle, and the L-shaped baffle are all provided with a silicone pad layer of 0.5-1mm thickness on the side near the patch.

[0015] Preferably, the outer wall of the pressure plate is provided with a guide rod, and the inner wall of the vacuum degassing chamber is provided with a guide groove, wherein the guide rod and the guide groove are slidably connected.

[0016] Preferably, the conveyor plate is provided with a handle on the side near the hatch.

[0017] Preferably, the top surface of the conveyor plate is coated with the PTFE coating.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] By cooperating with the U-shaped extrusion block on the inner wall of the door and the limiting block at the end of the conveyor plate, the conveyor plate can be directly laterally limited after the door is closed, preventing the conveyor plate from moving when the vacuum pump is drawing vacuum or the hydraulic rod is applying pressure, ensuring that the patch is in a stable position during the degassing process, and solving the problem of uneven degassing caused by the conveyor plate offset in traditional equipment.

[0020] The U-shaped silicone pad on the inside of the U-shaped extrusion block and the PTFE coating on the inner wall not only utilize the elastic buffer of the silicone pad to avoid wear caused by hard contact between the conveyor plate and the extrusion block, but also reduce the sliding friction coefficient and extend the service life of the silicone pad through the PTFE coating. At the same time, the frustum-shaped protrusions can further enhance the limiting friction and ensure the limiting stability.

[0021] The L-shaped baffle on the conveyor plate, the first hydraulic rod (with the first baffle) on the side wall of the vacuum degassing chamber, and the second hydraulic rod (with the second baffle) on the conveyor plate can form a four-way limit for the patch. Whether it is a rigid patch or a flexible patch, it can avoid displacement caused by pressure or airflow during degassing and ensure that the pressure of the pressure plate is evenly applied to the bonding surface. Attached Figure Description

[0022] Figure 1 This is a schematic cross-sectional view of Example 1 from a top perspective;

[0023] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure viewed from the left.

[0024] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the U-shaped extrusion block viewed from the left.

[0025] Figure 4 for Figure 1 A schematic diagram of the T-shaped chute from a top view.

[0026] In the diagram: 1-Vacuum degassing chamber, 2-Conveying plate, 3-Vacuum pump, 4-Door, 5-First hydraulic rod, 6-First baffle, 7-U-shaped extrusion block, 8-U-shaped silicone pad, 9-Frustum-shaped protrusion, 11-L-shaped baffle, 12-Second hydraulic rod, 13-Second baffle, 14-Pressurizing hydraulic rod, 15-Pressure plate, 17-T-shaped slide, 18-Guide groove, 19-Handle, 20-Receiving cavity, 21-Limiting block. Detailed Implementation

[0027] Example 1

[0028] A vacuum degassing machine for surface mount technology, such as Figure 1-2 As shown, it includes a vacuum degassing chamber 1, a conveying plate 2, a hydraulic pressurization assembly, and a vacuum pump 3; the side wall of the vacuum degassing chamber 1 is provided with a door 4 (a sealing strip is provided on the contact surface between the door 4 and the vacuum chamber, which is prior art and is not shown in the figure), and a first hydraulic rod 5 is provided on the side of the vacuum degassing chamber 1 adjacent to the door 4, and a first baffle 6 is provided on the piston rod end of the first hydraulic rod 5;

[0029] As shown in the figure, a U-shaped extrusion block 7 is installed on the inner wall of the hatch 4. A U-shaped silicone pad 8 is provided on the inner side of the U-shaped extrusion block 7. A plurality of frustum-shaped protrusions 9 are provided on the surface of the U-shaped silicone pad 8. The inner wall of the U-shaped silicone pad 8 and the surface of the frustum-shaped protrusions 9 are coated with a PTFE coating (not shown in the figure).

[0030] like Figure 1-2As shown, the conveyor plate 2 is slidably connected to the bottom wall of the vacuum degassing chamber 1; an L-shaped baffle 11 is provided at the end of the conveyor plate 2 away from the door 4, and a second hydraulic rod 12 is provided at the end near the door 4, with a second baffle 13 provided at the piston rod end of the second hydraulic rod 12; the side wall of the door 4 is provided with a receiving cavity 20 for receiving the second hydraulic rod 12; as shown Figure 3 As shown, a limit block 21 is provided at one end of the conveyor plate 2 near the U-shaped extrusion block 7.

[0031] like Figure 2 As shown, the hydraulic pressurization assembly includes a pressurizing hydraulic rod 14 and a pressure plate 15; the pressurizing hydraulic rod 14 is installed on the top of the vacuum degassing chamber 1, and the pressure plate 15 is disposed at the bottom of the pressurizing hydraulic rod 14; furthermore, as Figure 2 As shown, the outer wall of the pressure plate 15 is provided with a guide rod (not shown in the figure), and the inner wall of the vacuum degassing chamber 1 is provided with a guide groove 18 (e.g., Figure 2 As shown, in this embodiment, the inner wall of the vacuum degassing chamber 1, which is slidably connected to the guide rod, is provided with two guide grooves 18. The guide rod and the guide grooves 18 are slidably connected, which can limit the lateral displacement of the pressure plate 15 when the pressurized hydraulic rod 14 drives the pressure plate 15 to press down.

[0032] The vacuum pump 3 is connected to the vacuum pump interface of the vacuum degassing chamber 1 via a hose, and the vacuum pump 3 is equipped with a pressure gauge (not shown in the figure).

[0033] Working principle: During material preparation, first open the door 4 of the vacuum degassing chamber 1, retract the piston rod of the second hydraulic rod 12, and move the second baffle 13 away from the middle area of ​​the conveyor plate 2. Then, partially pull the conveyor plate 2 out of the vacuum degassing chamber 1. Next, place the patch to be degassed on the conveyor plate 2, ensuring that one side of the patch is aligned with the L-shaped baffle at the end of the conveyor plate 2 away from the door 4, completing the initial positioning. Then, activate the second hydraulic rod 12 to extend its piston rod, causing the second baffle 13 to press against the side of the patch closest to the door 4, completing the four-way limiting of the patch. The conveyor plate 2 is then pushed to slide along the bottom wall of the vacuum degassing chamber 1 until the limiting block 21 at the end of the conveyor plate 2 slides into the range of the U-shaped extrusion block on the inner wall of the door 4, at which point the pushing stops; then the door 4 is closed and hydraulically limited, and the door 4 is closed. At this time, the receiving cavity 20 on the side wall of the door 4 just receives the second hydraulic rod 12 to avoid interference. At the same time, the limiting block 21 is just located in the U-shaped extrusion block and extrudes the upper, lower and side walls of the U-shaped silicone pad 8 to the multiple frustum-shaped protrusions 9, thereby positioning the conveyor plate 2. Start the first hydraulic rod 5 to extend its piston rod, which drives the first baffle 6 to press against the side of the patch away from the L-shaped baffle. Then, start the vacuum degassing operation. Connect the vacuum pump 3 to the interface of the vacuum degassing chamber 1 through a hose. Start the vacuum pump 3 and observe the pressure gauge on the vacuum pump 3. When the vacuum degree in the chamber reaches -0.095 to -0.1 MPa, turn off the vacuum pump 3 to maintain pressure. Then, start the pressurizing hydraulic rod 14 to slowly extend its piston rod, which drives the pressure plate 15 to press down onto the patch surface. Maintain the preset pressure according to the patch type to complete the degassing (rigid patches usually take 1-2 minutes, flexible patches usually take 0.5-1 minutes). Finally, complete the unloading. After the degassing is completed, first open the pressure relief valve of the vacuum pump 3. After the pressure in the chamber returns to atmospheric pressure, retract the piston rods of the first hydraulic rod 5 and the second hydraulic rod 12, open the chamber door 4, pull out the conveyor plate 2, and take out the degassed patch to complete a single degassing process.

[0034] It is worth noting that in actual chip debubbling operations, to ensure that the pressure plate fully covers the chip bonding surface when it presses down, the height of the sidewalls of the first baffle 6, the second baffle 13, and the L-shaped baffle 11 near the chip needs to be limited. Specifically, the height of the sidewalls of the first baffle 6, the second baffle 13, and the L-shaped baffle 11 near the chip is 0.1-0.3 mm lower than the thickness of the chip to be debubbled, and not higher than the minimum coverage height of the pressure plate 15 and the chip bonding surface. For common chips with a thickness of 0.1-3 mm (rigid chips such as 0.5-3 mm glass substrates, flexible chips such as 0.1-0.8 mm FPC), the sidewall height range is controlled within 0.05-2.7 mm to ensure that the pressure plate 15 can completely cover the entire bonding surface of the chip when it presses down, without any debubbling blind spots.

[0035] Example 2

[0036] Based on Example 1, the U-shaped extrusion block 7 is made of nylon; the thickness of the U-shaped silicone pad 8 (Shore A hardness 30±5) is 1.5-2mm (ensuring sufficient elastic cushioning while avoiding excessive thickness that could lead to excessively large limiting gaps); the frustum-shaped protrusion 9 (in actual implementation, it should be made of the same material as the U-shaped silicone pad 8, preferably as an integrated piece) has an upper diameter of 0.6-0.8mm, a lower diameter of 1.0-1.2mm, and a height of 0.6-0.8mm (ensuring friction while avoiding interference with limiting); the PTFE coating on the inner wall of the U-shaped silicone pad 8 has a thickness of 0.1-0.2mm (maximizing wear resistance and reducing the frequency of daily maintenance without affecting the elasticity of the silicone).

[0037] Furthermore, the bottom end of the conveyor plate 2 is provided with multiple T-shaped sliders (not shown in the figure), and the inner bottom wall of the vacuum degassing chamber 1 is provided with T-shaped grooves 17 that slide in cooperation with the T-shaped sliders. Through the sliding cooperation between the T-shaped sliders and the T-shaped grooves, the conveyor plate 2 will not deviate laterally when sliding in the degassing chamber.

[0038] Furthermore, a 5-8mm thick silicone pad is provided at the end of the T-shaped chute 17 away from the door 4. When the conveyor plate 2 slides to the end of the degassing chamber, the silicone pad can buffer the impact force, preventing the T-shaped slider at the bottom of the conveyor plate 2 from making hard contact with the end of the chute, thus protecting the structural integrity of the slider and the chute.

[0039] Furthermore, a 0.5-1mm thick silicone pad layer (not shown in the figure) is provided on the side of the first baffle 6, the second baffle 13, and the L-shaped baffle 11 near the patch. For flexible patches (such as FPC, OCA optical adhesive), this silicone pad layer can prevent edge damage or indentation; for rigid patches (such as glass substrate, ceramic substrate), this silicone pad layer can prevent edge chipping caused by collision between the baffle and the patch, reducing the defect rate.

[0040] Furthermore, a handle 19 is provided on the side of the conveyor plate 2 near the hatch 4 to facilitate manual pushing and pulling of the conveyor plate 2.

[0041] Furthermore, the top surface of the conveyor plate 2 is coated with the PTFE coating (not shown in the figure), which can reduce the coefficient of friction between the patch and the surface of the conveyor plate 2. On the one hand, it facilitates the picking and placing of the patch and avoids the patch sticking to the conveyor plate 2 due to the adhesiveness of the bonding surface (such as OCA glue). On the other hand, it reduces surface wear when the patch slides, especially suitable for flexible patches such as polarizers and FPCs whose surfaces are easily scratched, ensuring the appearance quality of the patch.

Claims

1. A vacuum degassing machine for surface mount technology (SMT) applications, characterized in that, It includes a vacuum degassing chamber (1), a conveyor plate (2), a hydraulic pressurization assembly, and a vacuum pump (3); The vacuum degassing chamber (1) is provided with a door (4) on its side wall. A first hydraulic rod (5) is provided on the side of the vacuum degassing chamber (1) adjacent to the door (4). A first baffle (6) is provided at the piston rod end of the first hydraulic rod (5). The inner wall of the hatch (4) is equipped with a U-shaped extrusion block (7), and a U-shaped silicone pad (8) is provided on the inner side of the U-shaped extrusion block (7). The surface of the U-shaped silicone pad (8) is provided with multiple frustum-shaped protrusions (9), and the inner wall of the U-shaped silicone pad (8) is coated with a PTFE coating. The conveying plate (2) is slidably connected to the bottom wall of the vacuum degassing chamber (1); an L-shaped baffle (11) is provided at the end of the conveying plate (2) away from the door (4), and a second hydraulic rod (12) is provided at the end of the conveying plate (2) close to the door (4); a second baffle (13) is provided at the piston rod end of the second hydraulic rod (12); a receiving cavity (20) for receiving the second hydraulic rod (12) is provided on the side wall of the door (4); a limit block (21) is provided at the end of the conveying plate (2) close to the U-shaped extrusion block (7); The hydraulic pressurization assembly includes a pressurizing hydraulic rod (14) and a pressure plate (15); the pressurizing hydraulic rod (14) is installed on the top of the vacuum degassing chamber (1), and the pressure plate (15) is located at the bottom of the pressurizing hydraulic rod (14); The vacuum pump (3) is connected to the interface of the vacuum degassing chamber (1) through a hose, and a pressure gauge is provided on the vacuum pump (3).

2. The vacuum degassing machine for patch mounting according to claim 1, characterized in that, The U-shaped extrusion block (7) is made of nylon; the thickness of the U-shaped silicone pad (8) is 1.5-2mm; the upper diameter of the frustum-shaped protrusion (9) is 0.6-0.8mm, the lower diameter is 1.0-1.2mm, and the height is 0.6-0.8mm; the thickness of the PTFE coating on the inner wall of the U-shaped silicone pad (8) is 0.1-0.2mm.

3. A vacuum degassing machine for patch mounting according to claim 1, characterized in that, The bottom end of the conveyor plate (2) is provided with multiple T-shaped sliders, and the inner bottom wall of the vacuum degassing chamber (1) is provided with a T-shaped groove (17) that slides with the T-shaped sliders.

4. A vacuum degassing machine for patch mounting according to claim 3, characterized in that, A 5-8mm thick silicone pad is provided at the end of the T-shaped groove (17) away from the hatch (4).

5. A vacuum degassing machine for patch mounting according to claim 1, characterized in that, The first baffle (6), the second baffle (13) and the L-shaped baffle (11) are all provided with a silicone pad layer of 0.5-1mm thickness on the side near the patch.

6. A vacuum degassing machine for patch mounting according to claim 1, characterized in that, The outer wall of the pressure plate (15) is provided with a guide rod, and the inner wall of the vacuum degassing chamber (1) is provided with a guide groove (18). The guide rod and the guide groove (18) are slidably connected.

7. A vacuum degassing machine for patch mounting according to claim 1, characterized in that, The conveyor plate (2) is provided with a handle (19) on the side near the hatch (4).

8. A vacuum degassing machine for patch mounting according to claim 1, characterized in that, The top surface of the conveyor plate (2) is coated with the PTFE coating.

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