Negative-pressure filling and sealing system and negative-pressure filling and sealing process for filter

Abstract

A plurality of box-shaped filters are horizontally arranged on the surface of a linear conveying belt, and a glue filling groove of each box-shaped filter faces upwards; a glue pouring gun is arranged above the linear conveying belt; a glue outlet head is arranged at the lower end of the glue pouring gun; the plurality of box filters are conveyed by the linear conveying belt to reach the position under the glue filling gun one by one; the device further comprises a floating negative pressure box, a negative pressure bin which is opened downwards is arranged in the floating negative pressure box, and the glue outlet head is arranged in the negative pressure bin. The upper end face of the box-shaped filter is a rectangular closed-loop end face, a circle of rectangular closed-loop sealing ring is integrally arranged on the lower end face of the floating negative pressure box along the outline, and the rectangular closed-loop sealing ring is matched with the outline of the rectangular closed-loop end face at the upper end of the box-shaped filter, so that a high total-environment negative pressure environment is avoided; the local negative pressure environment in the floating negative pressure box is ingeniously created, the negative pressure size is small, and the floating negative pressure box has remarkable advantages in energy consumption and equipment cost.

Description

Technical Field

[0001] The invention belongs to the field of filter potting technology. Background Art

[0002] The filter's potting process can fill the gaps inside the filter and solidify it, forming a dense protective layer that effectively isolates environmental factors such as moisture, dust, and corrosive gases, preventing the circuit from getting damp, short-circuiting, or oxidizing, thereby significantly enhancing the equipment's weather resistance and service life. At the same time, the potting compound's insulating properties ensure stable electrical performance, making it particularly suitable for harsh environments such as automotive applications, characterized by high voltage, high humidity, and strong vibration. Furthermore, the potting compound's thermal conductivity (e.g., thermal conductivity ≥ 0.5W / mK) can optimize thermal management and prevent component damage from overheating, while its moderate hardness can also buffer mechanical stress and prevent component cracking or falling off due to vibration or impact. Overall, potting is not only a core process for filters to cope with complex operating conditions, but also an indispensable technical means to ensure their long-term and efficient operation.

[0003] Pouring glue under negative pressure environment can effectively eliminate bubbles. The existing negative pressure glue pouring process generally requires maintaining a negative pressure environment inside the entire glue pouring equipment. The glue pouring process under full negative pressure environment has the disadvantage of high equipment cost.

[0004] At the same time, even if the glue is poured under negative pressure, the bubbles in the potting glue are easily attached to the surface of the internal components of the filter or in the gaps (such as the coil gap, the edge of the solder joint) due to the viscosity of the glue. Figure 1 As shown, the bubbles hidden in the gap 25 between two adjacent filter coils 24 are still difficult to be completely discharged. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a filter negative pressure potting system and a negative pressure potting process, which avoids the use of a high full-environment negative pressure environment and instead cleverly creates a local negative pressure environment in a floating negative pressure box. The negative pressure volume is small and has significant advantages in energy consumption and equipment costs.

[0006] Technical solution: To achieve the above purpose, the present invention provides a filter negative pressure potting system, wherein several box-shaped filters are placed flat on the surface of a linear conveyor belt, and the glue potting groove of each box-shaped filter faces upward.

[0007] There is a glue filling gun above the linear conveyor belt, and the lower end of the glue filling gun is a glue discharge head; a number of box-shaped filters are transported by the linear conveyor belt to the bottom of the glue filling gun one by one; it also includes a floating negative pressure box, which contains a negative pressure bin open toward the bottom, and the glue discharge head is in the negative pressure bin; the upper end face of the box-shaped filter is a rectangular closed-loop end face, and the lower end face of the floating negative pressure box is integrally provided with a circle of rectangular closed-loop sealing ring along the contour, and the rectangular closed-loop sealing ring is adapted to the contour of the rectangular closed-loop end face of the upper end of the box-shaped filter.

[0008] When the floating negative pressure box drops relatively, the rectangular closed-loop sealing ring drops to the point where it seals and presses against the rectangular closed-loop end face of the box-shaped filter along the contour, and the negative pressure chamber and the glue pouring tank are combined into a closed cavity.

[0009] The suction end of the negative pressure suction hose is connected to the negative pressure chamber.

[0010] There is a top hole in the top wall of the floating negative pressure box, and the gun body of the glue gun passes downward through the top hole; an annular flexible closed cloth belt is provided between the inner circle of the top hole and the outer peripheral wall of the gun body of the glue gun, and the outer circle of the annular flexible closed cloth belt is sealed and connected to the inner circle of the top hole along the contour, and the inner circle is sealed and connected to the outer peripheral wall of the gun body of the glue gun along the contour, so that the inner circle of the top hole and the outer peripheral wall of the gun body of the glue gun are sealed. In the initial state, the annular flexible closed cloth belt is in a non-tensioned pleated shape, so that the glue gun and the floating negative pressure box can freely displace relative to each other within a certain range.

[0011] A first fixed arm and a second fixed wall are symmetrically fixed on both sides of a glue filling gun in the negative pressure chamber.

[0012] A first steering gear is fixedly installed at the end of the first fixed arm, a first rocker arm is vertically fixedly connected to the first steering gear shaft, a first roller is rotatably installed at the end of the first rocker arm through a bearing, and the axis of the first roller is parallel to the axis of the first steering gear shaft; a second steering gear is fixedly installed at the end of the second fixed arm, the second steering gear shaft of the second steering gear is horizontal and perpendicular to the X direction, a second rocker arm is vertically fixedly connected to the second steering gear shaft, a second roller is rotatably installed at the end of the second rocker arm through a bearing, and the axis of the second roller is parallel to the axis of the second steering gear shaft.

[0013] The ray with the center of the first steering gear shaft as its endpoint and extending in the X-direction is recorded as the first ray; the ray with the center of the second steering gear shaft as its endpoint and extending in the X+ direction is recorded as the second ray;

[0014] In the initial state, the first roller rolls tangentially to the inner surface of the front wall of the negative pressure box, and the angle between the first ray and the clockwise extension line of the first rocker arm is a°; the second roller rolls tangentially to the inner surface of the rear wall of the negative pressure box, and the angle between the second ray and the counterclockwise extension line of the second rocker arm is a°;

[0015] Based on the initial state, if the rectangular closed-loop end face of a box-shaped filter just coincides with the rectangular closed-loop sealing ring at the lower end of the floating negative pressure box when viewed from above: under the premise that the box-shaped filter is stationary, when the angle between the first ray and the extension line of the first rocker arm length in the clockwise direction increases to b°, and the angle between the second ray and the extension line of the second rocker arm length in the counterclockwise direction also increases to b°, the first roller just rolls tangent to the inner wall of the front wall of the filter, and the second roller just rolls tangent to the inner wall of the rear wall of the filter.

[0016] Based on the initial state, when the angle between the first ray and the extension line of the first rocker arm length in the clockwise direction becomes (ad)°, and the angle between the second ray and the extension line of the second rocker arm length in the counterclockwise direction is (a+d)°, the floating negative pressure box floats in the X-direction relative to the glue gun under the constraints of the first roller and the second roller.

[0017] Based on the initial state, when the angle between the first ray and the extension line of the first rocker arm length in the clockwise direction becomes (a+d)°, and the angle between the second ray and the extension line of the second rocker arm length in the counterclockwise direction becomes (ad)°, the floating negative pressure box will float in the X+ direction relative to the glue gun under the constraints of the first roller and the second roller.

[0018] The first fixed arm and the second fixed wall are both provided with electric telescopic devices with telescopic rods pointing vertically upwards; the upper ends of the telescopic rods of the electric telescopic devices are fixedly connected to sliders, and the sliders are movable and guided in guide rails extending along the X direction. The guide rails are fixed on the lower side of the top wall of the floating negative pressure box, and the two sliders are free to move along the X direction under the guidance of the corresponding guide rails.

[0019] Two convex linear limiting edges are arranged on the edge contours of both sides of the linear conveyor belt.

[0020] Potting process of filter negative pressure potting system:

[0021] Step 1: In the initial state, when a box-shaped filter moves along the X+ direction to the position directly below the floating negative pressure box, the transmission of the linear conveyor belt is suspended;

[0022] Step 2: Increase the angle between the first ray and the extension line of the first rocker arm length in the clockwise direction to b°, and increase the angle between the second ray and the extension line of the second rocker arm length in the counterclockwise direction to b°;

[0023] Step 3: Reduce the angle between the first ray and the extension line of the first rocker arm length in the clockwise direction to a°, and reduce the angle between the second ray and the extension line of the second rocker arm length in the counterclockwise direction to a°;

[0024] Step 4: The telescopic rod retracts downward, causing the floating negative pressure box to descend under the joint strict rolling guidance of the first roller and the second roller, so that the rectangular closed-loop sealing ring at the lower end of the floating negative pressure box descends to the rectangular closed-loop end face of the box-shaped filter along the contour sealing pressure, and the negative pressure exhaust hose exhausts air from the closed cavity formed by the negative pressure chamber and the glue filling tank;

[0025] Step 5: inject epoxy resin potting glue into the glue potting tank with a glue head;

[0026] Step 6: The angle between the first ray and the extension line of the first rocker arm in the clockwise direction is changed to (ad)°, and the angle between the second ray and the extension line of the second rocker arm in the counterclockwise direction is changed to (a+d)°;

[0027] Step 7: The angle between the first ray and the extension line of the first rocker arm in the clockwise direction is changed to (a+d)°, and the angle between the second ray and the extension line of the second rocker arm in the counterclockwise direction is changed to (ad)°;

[0028] Step 8: Repeat "Step 6" to "Step 7" periodically.

[0029] Beneficial Effects: This solution uses a unique first roller and second roller to effectively solve the problem of alignment between the rectangular closed-loop end face of the box-shaped filter and the rectangular closed-loop sealing ring at the lower end of the floating negative pressure box. Instead of using a costly full-environment negative pressure environment, the present invention cleverly creates a local negative pressure environment within the floating negative pressure box. The negative pressure volume is small, and it has significant advantages in energy consumption and equipment cost.

[0030] In terms of process, "Steps 6" to "Step 7" are repeated periodically. The epoxy resin potting glue in the glue tank is periodically and slightly swung back and forth in the X direction. The shear force generated by the lateral shaking can destroy the adhesion between the bubbles and the substrate and the surface tension of the glue, freeing the bubbles from their restraints, especially promoting the floating of bubbles hidden in the gap between two adjacent filter coils. At the same time, the vibration energy generated by the shaking causes tiny bubbles to escape from blind spots and migrate to the surface with the flow of glue. The bubbles merge into large bubbles during the collision, and their buoyancy increases as their volume increases, accelerating their floating and escape. The lateral shaking can change the flow direction of the glue, forcing the glue to penetrate into hidden areas that are difficult to cover with traditional potting, replacing residual air. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0032] Figure 2 for Figure 1 A local A-direction schematic diagram;

[0033] Figure 3 This is a schematic diagram of the floating negative pressure box from an upward perspective;

[0034] Figure 4 Schematic diagram of the process from step one to step two;

[0035] Figure 5 This is a schematic diagram of the process from step three to step four;

[0036] Figure 6 This is a process diagram from step five to step six. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] As attached Figures 1 to 6 A filter negative pressure potting system shown in FIG. 1 is potted against a box-shaped filter 9, specifically an EMI filter, the length, width and height of the box-shaped filter 9 are 15 cm, 7 cm and 3 cm respectively; Figure 1 The box-shaped filter 9 has a glue potting groove 13 inside, and the outer wall of the box-shaped filter 9 is provided with heat dissipation ribs; in order to prevent leakage or air leakage during the glue potting process, the wire holes at both ends of the box-shaped filter 9 for passing the lead wires 53 are pre-sealed by sealing bushings or sealants and other existing processes; the filter element is in the glue potting groove 13, and the filter element includes multiple groups of filter coils 24. After glue potting, the bubbles hidden in the gap 25 between the adjacent filter coils 24 are not easy to be discharged.

[0039] It includes a straight conveyor belt 10, and several box-shaped filters 9 are placed flat on the surface of the straight conveyor belt 10 at equal distances along the length direction, and the glue filling groove 13 of each box-shaped filter 9 faces upward; two side edge contours of the straight conveyor belt 10 are provided with two raised straight limit edges 22, and the spacing between the two straight limit edges 22 is just consistent with the width size of the box-shaped filter 9. Each box-shaped filter 9 on the straight conveyor belt 10 is between the two straight limit edges 22, thereby strictly constraining the position of each box-shaped filter 9 on the straight conveyor belt 10 in the width direction.

[0040] A glue gun 21 pointing vertically downward is provided directly above the linear conveyor belt 10 , the lower end of the glue gun 21 is a glue outlet head 8 , and the glue gun 21 is a fixed part under the action of the bracket; a plurality of box-shaped filters 9 are transported by the linear conveyor belt 10 one by one to the bottom of the glue gun 21 .

[0041] The transport direction of the linear conveyor belt 10 is recorded as X+ direction.

[0042] like Figures 3 to 6 , and also includes a floating negative pressure box 4, which contains a negative pressure bin 50 open downward, and the glue discharge head 8 is in the negative pressure bin 50; it also includes a negative pressure exhaust hose 40, the exhaust end of the negative pressure exhaust hose 40 is connected to the negative pressure bin 50; the other end of the negative pressure exhaust hose 40 is connected to the air inlet end of the negative pressure exhaust pump; the upper end face of the box-shaped filter 9 is a rectangular closed-loop end face 11, and the lower end face of the floating negative pressure box 4 is integrally provided with a circle of rectangular closed-loop sealing ring 12 along the contour, and the rectangular closed-loop sealing ring 12 is adapted to the contour of the rectangular closed-loop end face 11 of the upper end of the box-shaped filter 9; the rectangular closed-loop sealing ring 12 is made of sealing rubber or silicone; when the floating negative pressure box 4 drops relatively, causing the rectangular closed-loop sealing ring 12 to drop to the rectangular closed-loop end face 11 of the box-shaped filter 9 along the contour sealing top pressure, the negative pressure bin 50 and the glue pouring groove 13 are combined into a closed cavity.

[0043] The top wall of the floating negative pressure box 4 is hollowed out to form a top hole 71. Figure 1 , the gun body of the glue gun 21 passes downward through the top hole 71, so that the glue head 8 is in the negative pressure chamber 50; an annular flexible closed cloth belt 20 is provided between the inner ring of the top hole 71 and the outer peripheral wall of the gun body of the glue gun 21, and the outer ring of the annular flexible closed cloth belt 20 is sealed and connected to the inner ring of the top hole 71 along the contour, and the inner ring of the annular flexible closed cloth belt 20 is sealed and connected to the outer peripheral wall of the gun body of the glue gun 21 along the contour; the annular flexible closed cloth belt 20 is a non-air-permeable composite material, so that the inner ring of the top hole 71 and the outer peripheral wall of the gun body of the glue gun 21 are sealed. In the initial state, the annular flexible closed cloth belt 20 is in a non-tightened pleated shape, so that the glue gun 21 and the floating negative pressure box 4 can freely displace relative to each other within a certain range.

[0044] The annular flexible closed cloth belt 20 is a non-breathable flexible composite cloth body - polyurethane PU coating / high-strength base cloth composite structure; the material has good non-breathability and pressure difference resistance; the base cloth is made of high-strength synthetic fiber nylon or polyester fabric with a surface density of 80-150g / m 2 ) provides mechanical support; and the functional coating polyurethane (PU) dense coating (thickness 0.01 ~ 0.05mm) on both sides of the base fabric forms a continuous non-porous membrane layer, effectively blocking gas penetration.

[0045] like Figure 4 As shown, a first fixed arm 6a and a second fixed wall 6b are symmetrically fixed on both sides of a glue gun 21 in the negative pressure chamber 50; an electric telescopic device 17 with a telescopic rod 14 pointing vertically upward is fixedly installed on the first fixed arm 6a and the second fixed wall 6b; the upper end of the telescopic rod 14 of the electric telescopic device 17 is fixedly connected with a slider 16, and the slider 16 is movable and guided in the guide rail 15 extending along the X direction. The guide rail 15 is fixed to the lower side of the top wall of the floating negative pressure box 4, and the two sliders 16 are displaced in the X direction under the guidance of the corresponding guide rail 15; thereby, the glue gun 21 and the floating negative pressure box 4 undergo relative displacement in the vertical direction under the action of the synchronous telescopic movement of the two electric telescopic devices 17; at the same time, the floating negative pressure box 4 floats in the X direction relative to the glue gun 21 under the guidance of the slider 16 and the guide rail 15;

[0046] The first steering gear 1a is fixedly mounted on the end of the first fixed arm 6a. The first steering gear shaft 2a of the first steering gear 1a is horizontal and perpendicular to the X direction. The first rocker arm 3a is vertically fixedly connected to the first steering gear shaft 2a. The first roller 5a is rotatably mounted on the end of the first rocker arm 3a via a bearing. The axis of the first roller 5a is parallel to the axial direction of the first steering gear shaft 2a.

[0047] A second servo 1b is fixedly mounted on the end of the second fixed arm 6b. The second servo shaft 2b of the second servo 1b is horizontal and perpendicular to the X direction. A second rocker arm 3b is vertically fixedly connected to the second servo shaft 2b. A second roller 5b is rotatably mounted on the end of the second rocker arm 3b via a bearing. The axis of the second roller 5b is parallel to the axis of the second servo shaft 2b. Both the first servo 1a and the second servo 1b are servo motors and have a locking brake function.

[0048] The front and rear walls of the floating negative pressure box 4 along the X direction are respectively recorded as the negative pressure box front wall 4a and the negative pressure box rear wall 4b; the front and rear walls of the box-shaped filter 9 along the X direction are respectively recorded as the filter front wall 9a and the filter rear wall 9b.

[0049] The ray with the center of the first steering gear shaft 2a as the endpoint and extending in the X-direction is recorded as the first ray 7a; the ray with the center of the second steering gear shaft 2b as the endpoint and extending in the X+ direction is recorded as the second ray 7b.

[0050] like Figure 4 、 5 , 6; In the initial state, the first roller 5a is tangent to the inner wall surface of the front wall 4a of the negative pressure box, and the angle formed between the first ray 7a and the extension line of the length of the first rocker arm 3a in the clockwise direction is a°; the second roller 5b is tangent to the inner wall surface of the rear wall 4b of the negative pressure box, and the angle formed between the second ray 7b and the extension line of the length of the second rocker arm 3b in the counterclockwise direction is a°, where a° ranges from 45° to 90°;

[0051] Based on the initial state, if the rectangular closed-loop end face 11 of a box-shaped filter 9 just coincides with the rectangular closed-loop sealing ring 12 at the lower end of the floating negative pressure box 4 when viewed from above: under the premise that the box-shaped filter 9 is stationary, when the angle between the first ray 7a and the length extension line of the first rocker arm 3a in the clockwise direction increases to b°, and the angle between the second ray 7b and the length extension line of the second rocker arm 3b in the counterclockwise direction also increases to b°, the first roller 5a just rolls tangent to the inner wall of the front wall 9a of the filter, and the second roller 5b just rolls tangent to the inner wall of the rear wall 9a of the filter; the range of b° is 180°~360°.

[0052] Based on the initial state, when the angle between the first ray 7a and the clockwise extension of the length of the first rocker arm 3a becomes (ad)°, and the angle between the second ray 7b and the counterclockwise extension of the length of the second rocker arm 3b is (a+d)°, the floating negative pressure box 4 floats in the X-direction relative to the glue gun 21 under the constraints of the first roller 5a and the second roller 5b;

[0053] Based on the initial state, when the angle between the first ray 7a and the length extension line of the first rocker arm 3a in the clockwise direction becomes (a+d)°, and the angle between the second ray 7b and the length extension line of the second rocker arm 3b in the counterclockwise direction becomes (ad)°, the floating negative pressure box 4 will float in the X+ direction relative to the glue gun 21 under the constraints of the first roller 5a and the second roller 5b; the value of d is less than 3.

[0054] Working principle and steps:

[0055] Step 1: In the initial state, the first roller 5a is tangent to the inner surface of the front wall 4a of the negative pressure box, and the angle between the first ray 7a and the clockwise extension of the length of the first rocker arm 3a is a°. The second roller 5b is tangent to the inner surface of the rear wall 4b of the negative pressure box, and the angle between the second ray 7b and the counterclockwise extension of the length of the second rocker arm 3b is a°. At this time, the floating negative pressure box 4 is completely constrained in the X direction by the first roller 5a and the second roller 5b. The value of a° is a fixed value. In the scenario of this solution, a° = 80°.

[0056] At the same time, the linear conveyor belt 10 transmits several box-shaped filters 9 along the X+ direction. When a box-shaped filter 9 is displaced to the bottom of the floating negative pressure box 4 along the X+ direction, the transmission of the linear conveyor belt 10 is immediately suspended. At this time, due to factors such as the inherent inertia of the transmission system and the linear conveyor belt 10, the error of the position sensor system, and the slight slip of the box-shaped filter 9, the position of the box-shaped filter 9 that has just arrived at the bottom of the floating negative pressure box 4 is likely to have a certain slight error in the X direction. The error is controlled within 5mm, so that the rectangular closed-loop sealing ring 12 at the lower end of the floating negative pressure box 4 is likely to not be completely aligned with the rectangular closed-loop end face 11 of the box-shaped filter 9 directly below when viewed from above. Figure 4 As shown in the figure above; it is easy to make it impossible to form a sealed negative pressure environment during the subsequent glue filling process.

[0057] Step 2: Operate the first servo 1a and the second servo 1b to increase the angle between the first ray 7a and the clockwise extension of the length of the first rocker arm 3a to b°, and the angle between the second ray 7b and the counterclockwise extension of the length of the second rocker arm 3b to b°. The value of b° is a fixed value. In this scenario, b° = 260°.

[0058] If there is indeed a slight error in the position of the box-shaped filter 9 in the X direction, during the above process, the first roller 5a and the second roller 5b will dynamically constrain the inner side surface of the filter front wall 9a and the inner side surface of the filter rear wall 9b of the box-shaped filter 9, respectively, so that the box-shaped filter 9 as a whole slides along the X direction of the linear conveyor belt 10 to a determined position under the dynamic constraints of the first roller 5a and the second roller 5b;

[0059] Finally, the first roller 5a rolls tangentially with the inner side wall of the filter front wall 9a, and the second roller 5b rolls tangentially with the inner side wall of the filter rear wall 9a;

[0060] In this state, the rectangular closed loop end face 11 of the box-shaped filter 9 is aligned with the rectangular closed loop sealing ring 12 at the lower end of the floating negative pressure box 4 in the initial state when viewed from above; Figure 4 The picture below.

[0061] Step three, by running the first servo 1a and the second servo 1b, the angle between the first ray 7a and the length extension line of the first rocker arm 3a in the clockwise direction is reduced to a°, and the angle between the second ray 7b and the length extension line of the second rocker arm 3b in the counterclockwise direction is also reduced to a°, so that the floating negative pressure box 4 is strictly constrained to the position of the initial state in the X direction by the first roller 5a and the second roller 5b; at this time, the rectangular closed-loop sealing ring 12 at the lower end of the floating negative pressure box 4 is completely aligned with the rectangular closed-loop end face 11 of the box-shaped filter 9 directly below when viewed from above, and the first servo 1a and the second servo 1b are locked at this time; as shown in FIG. Figure 5 's picture above.

[0062] Step four, simultaneously control the telescopic rods 14 of the two electric telescoping devices 17 to retract downward, so that the floating negative pressure box 4 descends under the joint strict rolling guidance of the first roller 5a and the second roller 5b, so that the rectangular closed-loop sealing ring 12 at the lower end of the floating negative pressure box 4 descends to the rectangular closed-loop end face 11 of the box-shaped filter 9 along the contour sealing top pressure, so that the negative pressure bin 50 and the glue filling groove 13 are combined into a closed cavity. At this time, the negative pressure exhaust pump exhausts the closed cavity formed by the negative pressure bin 50 and the glue filling groove 13 through the negative pressure exhaust hose 40, so that the closed cavity formed by the negative pressure bin 50 and the glue filling groove 13 enters a negative pressure environment with a negative pressure intensity of -75kPa to -101kPa; Figure 5 The picture below.

[0063] Step five, on the basis of maintaining the closed cavity formed by the negative pressure chamber 50 and the glue potting groove 13 into a negative pressure environment with a negative pressure strength of -75kPa to -101kPa, control the glue head 8 to inject the epoxy resin potting glue 60 into the glue potting groove 13 until the epoxy resin potting glue 60 completely submerges the filter element in the glue potting groove 13; since the process of injecting the epoxy resin potting glue 60 into the glue potting groove 13 is always in a negative pressure environment with a negative pressure strength of -75kPa to -101kPa, the bubbles generated by the contact between the glue and the air during the glue potting process are extracted under negative pressure, and at the same time, the tiny bubbles originally under normal pressure become larger under the strong negative pressure environment, making it easier to float up and defoam. After the negative pressure vacuum glue potting, the colloid filling is homogenized, the heat dissipation consistency is improved, and the product life is effectively improved.

[0064] Even with negative pressure, the filter element of this embodiment is placed in the potting tank 13. The filter element includes multiple filter coils 24. After potting, bubbles in the potting glue tend to adhere to the surface of the component or gaps (such as the gap between the coils and the edge of the solder joint) due to the viscosity of the glue. In particular, bubbles trapped in the gap 25 between two adjacent filter coils 24 are still difficult to be completely discharged.

[0065] At this time, the telescopic rods 14 of the two electric telescopic devices 17 are simultaneously controlled to push upward, so that the floating negative pressure box 4 rises relatively, and then under the action of negative pressure, the box-shaped filter 9 that has been glued rises to just separate from the linear conveyor belt 10. In order to prevent splashing caused by adsorption errors, the height of this solution from the ground is less than 3mm; Figure 6 The ground clearance in the above picture is exaggerated.

[0066] Step 6: Operate the first servo 1a and the second servo 1b, so that the angle between the first ray 7a and the length extension line of the first rocker arm 3a in the clockwise direction becomes (ad)°, and the angle between the second ray 7b and the length extension line of the second rocker arm 3b in the counterclockwise direction becomes (a+d)°. The floating negative pressure box 4 is constrained by the first roller 5a and the second roller 5b, and floats slightly in the X-direction relative to the glue gun 21; the value of d is less than 3; so that the epoxy resin potting glue 60 in the glue tank 13 sways slightly in the X+ direction under the action of inertia; as shown in FIG. Figure 6 The picture below.

[0067] Step seven: operate the first servo 1a and the second servo 1b, so that the angle between the first ray 7a and the length extension line of the first rocker arm 3a in the clockwise direction becomes (a+d)°, and the angle between the second ray 7b and the length extension line of the second rocker arm 3b in the counterclockwise direction becomes (ad)°. The floating negative pressure box 4 floats in the X+ direction relative to the glue gun 21 under the constraints of the first roller 5a and the second roller 5b; the value of d is less than 3; thereby causing the epoxy resin potting glue 60 in the glue tank 13 to sway slightly in the X- direction under the action of inertia.

[0068] Step eight, repeatedly and periodically repeating "step six" to "step seven", with one cycle controlled within 0.5s; making the epoxy resin potting glue 60 in the potting groove 13 periodically and slightly swing back and forth along the X direction, the shear force generated by the lateral shaking can destroy the adhesion between the bubbles and the substrate and the surface tension of the glue, so that the bubbles are freed from the constraints, especially promoting the bubbles hidden in the gap 25 between the two adjacent filter coils 24 to float up, and at the same time, the vibration energy generated by the shaking makes the tiny bubbles escape from the dead corners and migrate to the surface with the flow of glue; the bubbles merge into large bubbles during the collision, and the buoyancy is enhanced after the volume increases, which accelerates the floating and escape; the lateral shaking can change the flow direction of the glue, forcing the colloid to penetrate into the hidden areas that are difficult to cover with traditional potting, replacing the residual air.

[0069] Step nine, after the predetermined time is continuously executed, 30 seconds, the telescopic rods 14 of the two electric telescopic devices 17 are simultaneously controlled to retract downward, and then the negative pressure in the negative pressure chamber 50 is released, and finally the telescopic rods 14 of the two electric telescopic devices 17 are controlled to extend upward again and finally return to the initial state; at this point, a complete vacuum injection and dynamic defoaming cycle is completed, and then the next cycle is entered.

[0070] The present invention does not have a full-surface negative pressure environment, but creates a local negative pressure environment in the floating negative pressure box 4. The volume required to maintain the negative pressure environment is small, and it has significant advantages in energy consumption and equipment cost.

[0071] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A filter negative pressure potting system, characterized in that: A plurality of box-shaped filters (9) are placed flat on a linear conveyor belt (10), with the glue filling groove (13) of each box-shaped filter (9) facing upward; A glue gun (21) is provided above the linear conveyor (10), and a glue discharging head (8) is provided at the lower end of the glue gun (21); a plurality of box-shaped filters (9) are transported by the linear conveyor (10) and arrive one by one directly below the glue gun (21); the system further comprises a floating negative pressure box (4), wherein the floating negative pressure box (4) contains a negative pressure bin (50) open downward, and the glue discharging head (8) is located in the negative pressure bin (50); the upper end face of the box-shaped filter (9) is a rectangular closed-loop end face (11), and the lower end face of the floating negative pressure box (4) is integrally provided with a circle of rectangular closed-loop sealing ring (12) along the contour, and the rectangular closed-loop sealing ring (12) is adapted to the contour of the rectangular closed-loop end face (11) at the upper end of the box-shaped filter (9); When the floating negative pressure box (4) relatively descends, causing the rectangular closed-loop sealing ring (12) to descend to the rectangular closed-loop end face (11) of the box-shaped filter (9) along the contour sealing pressure, the negative pressure chamber (50) and the glue pouring groove (13) are combined into a closed cavity.

2. A filter negative pressure potting system according to claim 1, characterized in that: The suction end of the negative pressure suction hose (40) is connected to the negative pressure chamber (50).

3. The filter negative pressure potting system according to claim 1, characterized in that: The top wall of the floating negative pressure box (4) is provided with a top hole (71), and the gun body of the glue gun (21) passes downward through the top hole (71); an annular flexible closed cloth belt (20) is provided between the inner ring of the top hole (71) and the outer peripheral wall of the gun body of the glue gun (21); the outer ring of the annular flexible closed cloth belt (20) is sealed and connected to the inner ring of the top hole (71) along the contour, and the inner ring is sealed and connected to the outer peripheral wall of the gun body of the glue gun (21) along the contour, so that the inner ring of the top hole (71) and the outer peripheral wall of the gun body of the glue gun (21) are sealed. In the initial state, the annular flexible closed cloth belt (20) is in a non-tightened folded shape, so that the glue gun (21) and the floating negative pressure box (4) can freely move relative to each other within a certain range.

4. The filter negative pressure potting system according to claim 1, characterized in that: A first fixed arm (6a) and a second fixed wall (6b) are symmetrically fixed on both sides of a glue-filling gun (21) in a negative pressure chamber (50); a first steering gear (1a) is fixedly mounted on the end of the first fixed arm (6a); a first rocker arm (3a) is vertically fixedly connected to the first steering gear shaft (2a); a first roller (5a) is rotatably mounted on the end of the first rocker arm (3a) via a bearing; the axis of the first roller (5a) is axially parallel to the first steering gear shaft (2a); a second steering gear (1b) is fixedly mounted on the end of the second fixed arm (6b); the second steering gear shaft (2b) of the second steering gear (1b) is horizontal and vertical to the X direction; a second rocker arm (3b) is vertically fixedly connected to the second steering gear shaft (2b); a second roller (5b) is rotatably mounted on the end of the second rocker arm (3b) via a bearing; the axis of the second roller (5b) is axially parallel to the second steering gear shaft (2b).

5. The filter negative pressure potting system according to claim 4, characterized in that: The ray with the center of the first steering gear shaft (2a) as the endpoint and extending in the X-direction is recorded as the first ray (7a); the ray with the center of the second steering gear shaft (2b) as the endpoint and extending in the X+ direction is recorded as the second ray (7b); in the initial state, the first roller (5a) is tangent to the inner wall surface of the front wall (4a) of the negative pressure box in rolling, and the angle between the first ray (7a) and the length extension line of the first rocker arm (3a) in the clockwise direction is a°; the second roller (5b) is tangent to the inner wall surface of the rear wall (4b) of the negative pressure box in rolling, and the angle between the second ray (7b) and the length extension line of the second rocker arm (3b) in the counterclockwise direction is a°; On the basis of the initial state, if the rectangular closed-loop end face (11) of a certain box-shaped filter (9) coincides with and aligns with the rectangular closed-loop sealing ring (12) at the lower end of the floating negative pressure box (4) when viewed from above: under the premise that the box-shaped filter (9) is stationary, when the angle formed between the first ray (7a) and the length extension line of the first rocker arm (3a) in the clockwise direction increases to b°, and the angle formed between the second ray (7b) and the length extension line of the second rocker arm (3b) in the counterclockwise direction also increases to b°, the first roller (5a) is exactly tangent to the inner side wall of the filter front wall (9a), and the second roller (5b) is exactly tangent to the inner side wall of the filter rear wall (9a); On the basis of the initial state, when the angle formed between the first ray (7a) and the length extension line of the first rocker arm (3a) in the clockwise direction becomes (ad)°, and the angle formed between the second ray (7b) and the length extension line of the second rocker arm (3b) in the counterclockwise direction becomes (a+d)°, the floating negative pressure box (4) floats in the X-direction relative to the glue gun (21) under the constraints of the first roller (5a) and the second roller (5b).

6. The filter negative pressure potting system according to claim 4, characterized in that: The first fixed arm (6a) and the second fixed wall (6b) are both provided with an electric telescopic device (17) with a telescopic rod (14) facing upwards; the upper end of the telescopic rod (14) of the electric telescopic device (17) is fixedly connected with a slider (16); the slider (16) is movably guided and engaged in a guide rail (15) extending along the X direction; the guide rail (15) is fixed to the lower side of the top wall of the floating negative pressure box (4); and the two sliders (16) are freely displaced along the X direction under the guidance of the corresponding guide rail (15).

7. The filter negative pressure potting system according to claim 6, characterized in that: Two convex linear limiting edges (22) are provided on the edge contours of both sides of the linear conveyor belt (10).

8. The potting process of the filter negative pressure potting system according to claim 7, characterized in that: Step 1: In the initial state, when a box-shaped filter (9) is displaced along the X+ direction to the position directly below the floating negative pressure box (4), the transmission of the linear conveyor belt (10) is suspended; Step 2: Increase the angle between the first ray (7a) and the length extension line of the first rocker arm (3a) in the clockwise direction to b°, and also increase the angle between the second ray (7b) and the length extension line of the second rocker arm (3b) in the counterclockwise direction to b°; Step 3: Reduce the angle between the first ray (7a) and the length extension line of the first rocker arm (3a) in the clockwise direction to a°, and reduce the angle between the second ray (7b) and the length extension line of the second rocker arm (3b) in the counterclockwise direction to a°; Step 4: The telescopic rod (14) is retracted downward, and the floating negative pressure box (4) is lowered under the rolling guidance of the first roller (5a) and the second roller (5b), so that the rectangular closed-loop sealing ring (12) at the lower end of the floating negative pressure box (4) is lowered to the rectangular closed-loop end face (11) of the box-shaped filter (9) along the contour sealing top pressure, and the negative pressure exhaust hose (40) exhausts air from the closed cavity formed by the negative pressure chamber (50) and the glue filling tank (13); Step 5: The glue head (8) injects epoxy resin potting glue (60) into the glue potting groove (13); Step 6: The angle between the first ray (7a) and the length extension line of the first rocker arm (3a) in the clockwise direction is changed to (ad)°, and the angle between the second ray (7b) and the length extension line of the second rocker arm (3b) in the counterclockwise direction is changed to (a+d)°; Step 7: The angle between the first ray (7a) and the length extension line of the first rocker arm (3a) in the clockwise direction is changed to (a+d)°, and the angle between the second ray (7b) and the length extension line of the second rocker arm (3b) in the counterclockwise direction is changed to (ad)°; Step 8: Repeat "Step 6" to "Step 7" periodically.

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