Manufacturing device for improving poor copper sheet separation after PCB slot tin spraying

Abstract

The utility model provides a manufacturing device for improving poor copper sheet separation after PCB slotted hole tin spraying, and relates to the technical field of PCB manufacturing, the manufacturing device comprises a cleaning kettle, the top of the cleaning kettle is provided with a square hole, the top of the cleaning kettle is covered with a kettle cover, the top of the kettle cover is fixed and communicated with a COO inlet pipe and a methanol inlet pipe, and the COO inlet pipe and the methanol inlet pipe are communicated with each other. A high-precision metering pump is mounted on the methanol inlet pipe, and a pressure pumping pipe is fixed and communicated with the surface, close to the top, of the cleaning kettle. According to the utility model, the supercritical CO has both gas diffusivity and liquid solubility, and can penetrate into the PCB slotted hole in cooperation with the cross cavity and the screen plate structure in the device, so that the effect of thoroughly removing residues in the slotted hole can be achieved. Meanwhile, by dynamically adjusting cleaning parameters, the cleaning process can be optimized according to the characteristics of different slotted holes (such as high density and high thickness-diameter ratio), the effect of reducing the copper sheet separation reject ratio can be achieved, no strong mechanical impact or harmful residues exist in the cleaning process, PCB damage is avoided, and the electrical performance and stability of products are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to PCB manufacturing technical field especially relates to a kind of production device for improving the separation of copper skin after PCB slot hole tin spraying. BACKGROUND

[0002] With the rapid development of emerging technologies such as 5G communication, artificial intelligence and Internet of Things, the global electronic industry's demand for PCB (printed circuit board) continues to grow, and the requirements for PCB performance are increasingly stringent. As the key part of connecting different layers of circuit and installing electronic components, the processing precision and surface treatment quality of PCB slot hole directly determine the performance of PCB. In the process of slot hole tin spraying, the poor separation of copper skin seriously affects the stability and service life of electronic products. The chemical residue in the narrow space of slot hole is difficult to remove by conventional washing and drying process, becoming a corrosion hazard. Traditional cleaning methods cannot meet the production needs of high-quality PCBs.

[0003] Traditional cleaning methods cannot reach the fine structure of PCB slot hole, and residual substances such as chemical solution and impurities remain. During tin spraying, the copper skin separates due to thermal stress and chemical corrosion, resulting in high rejection rate. High-pressure water guns and improper chemical cleaning can cause PCB copper foil deformation and component solder joint loosening, affecting electrical performance and increasing product scrap rate. SUMMARY

[0004] The utility model aims at solving the problem of chemical residue in the narrow space of slot hole in the prior art, which is difficult to remove by conventional washing and drying process, and becomes a corrosion hazard. A production device for improving the separation of copper skin after PCB slot hole tin spraying is proposed.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a production device for improving the separation of copper skin after PCB slot hole tin spraying, comprising a cleaning kettle, a square hole is formed in the top of the cleaning kettle, a kettle cover is covered on the top of the cleaning kettle, a CO2 inlet pipe and a methanol inlet pipe are fixed and communicated on the top of the kettle cover, a high-precision metering pump is installed on the methanol inlet pipe, an extraction pipe is fixed and communicated on the surface of the cleaning kettle and close to the top, a lifting frame is arranged inside the cleaning kettle and below the square hole, cross cavities are formed at equal intervals on the surface of the lifting frame, mesh plates are fixed and connected inside the lifting frame and above and below the cross cavities, limit blocks are fixed and connected on three sides of the lifting frame and close to the center of the bottom, limit rods are connected through and slide on the center of the limit blocks, the two ends of the limit rods are fixedly connected with the cleaning kettle, a lifting plate is fixed and connected on the other side of the lifting frame and close to the center of the bottom, and a screw rod is connected through and screwed on the center of the lifting plate.

[0006] Preferably, the bottom of the cleaning kettle is fixedly connected with support legs at equal intervals near the edge, and the bottom of the support leg is trapezoidal.

[0007] Preferably, a control panel is mounted on the surface of the cleaning kettle.

[0008] Preferably, a heating cylinder is fixedly connected to the inner wall of the cleaning kettle, and a cooling coil is mounted inside the inner wall of the cleaning kettle.

[0009] Preferably, a pressure gauge and a safety pressure relief valve are fixedly mounted on the top of the kettle cover.

[0010] Preferably, a ring groove is formed in the top of the cleaning kettle, a ring plate is embedded in the ring groove, a sealing ring pad is fixedly connected to the bottom of the ring plate, and the top of the ring plate is fixedly connected to the bottom of the kettle cover.

[0011] Preferably, the top of the screw rod is rotatably connected to the inner wall bearing of the top of the cleaning kettle, the bottom of the screw rod penetrates the bottom of the cleaning kettle and is rotatably connected to the bearing thereof, a driving motor is fixedly connected to the bottom of the cleaning kettle, and the output end of the driving motor is fixedly connected to the bottom of the screw rod.

[0012] Compared with the prior art, the advantages and positive effects of the utility model lie in that,

[0013] 1、In the utility model, supercritical CO2 has gas diffusion and liquid solubility, and cooperates with the cross cavity and the mesh plate structure in the device, can be deeply into the PCB slot hole, can play the effect of completely removing the residues in the slot hole. At the same time, through dynamic adjustment of cleaning parameters, the cleaning process can be optimized according to different slot hole characteristics (such as high density and high thickness-diameter ratio), the effect of reducing the poor separation rate of copper skin can be played, and there is no strong mechanical impact and harmful residue in the cleaning process, PCB damage is avoided, and the electrical performance and stability of the product are guaranteed.

[0014] 2、In the utility model, through the cooperative work of the lifting frame and the driving motor, the effect of realizing the lifting of PCB can be played, so that the PCB can be conveniently placed on the mesh plate or taken off from the mesh plate. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A whole structure perspective view of the device for improving the poor separation of copper skin after PCB slot hole tin spraying is provided for the utility model.

[0016] Figure 2 A whole structure sectional view of the device for improving the poor separation of copper skin after PCB slot hole tin spraying is provided for the utility model.

[0017] Figure 3The utility model provides a kind of lifting assembly structure perspective view of improving the poor production device of copper skin separation after PCB slot hole tin spraying;

[0018] Figure 4 The utility model provides a kind of improving the poor production device of copper skin separation after PCB slot hole tin spraying Figure 2 The enlarged view of structure in A area in middle;

[0019] Figure 5 The utility model provides a kind of improving the poor production device of copper skin separation after PCB slot hole tin spraying Figure 2 The enlarged view of structure in B area in middle.

[0020] Legend: 1, cleaning kettle; 2, support leg; 3, control panel; 4, cooling coil; 5, heating cylinder; 6, square hole; 7, kettle cover; 8, CO2 inlet pipe; 9, methanol inlet pipe; 10, high-precision metering pump; 11, pressure gauge; 12, safety pressure relief valve; 13, ring groove; 14, ring plate; 15, sealing ring pad; 16, suction pipe; 17, lifting frame; 18, cross cavity; 19, screen plate; 20, limit block; 21, limit rod; 22, screw rod; 23, lifting plate; 24, driving motor. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purposes, features and advantages of the utility model, the utility model will be further described below in conjunction with the drawings and examples. It should be noted that the embodiments of the present application and the features in the examples can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model can also be implemented in other ways different from those described herein, therefore, the present utility model is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1, as Figures 1-5The utility model provides a kind of to improve the production device of PCB slot hole tin spraying after copper skin separation, including cleaning kettle 1, the top of cleaning kettle 1 is equipped with square hole 6, the top of cleaning kettle 1 is covered with kettle cover 7, the top of kettle cover 7 is fixed and is communicated with CO2 inlet pipe 8 and methanol inlet pipe 9, high-precision metering pump 10 is installed on methanol inlet pipe 9, the surface of cleaning kettle 1 and close to the top fixed and communicated with suction pipe 16, the inside of cleaning kettle 1 and below square hole 6 are equipped with lifting frame 17, the surface of lifting frame 17 is equipped with cross cavity 18 at equal intervals, the inside of lifting frame 17 and below cross cavity 18 are fixedly connected with screen plate 19, three sides of lifting frame 17 and close to bottom center are all fixedly connected with limit block 20, limit block 20 is fixedly connected with limit rod 21 at center portion and is slidably connected, the two ends of limit rod 21 are fixedly connected with cleaning kettle 1, the other side of lifting frame 17 and close to bottom center are fixedly connected with lifting plate 23, screw rod 22 is connected with the center portion of lifting plate 23 and is screwed.

[0024] The effect achieved by the whole embodiment 1 is that the top of cleaning kettle 1 is equipped with square hole 6, the top of cleaning kettle 1 is covered with kettle cover 7, the top of kettle cover 7 is fixed and is communicated with CO2 inlet pipe 8 and methanol inlet pipe 9, which can fill CO2 and methanol, high-precision metering pump 10 is installed on methanol inlet pipe 9, which can control the amount of methanol entering, the surface of cleaning kettle 1 and close to the top fixed and communicated with suction pipe 16, which can empty air, the inside of cleaning kettle 1 and below square hole 6 are equipped with lifting frame 17, the surface of lifting frame 17 is equipped with cross cavity 18 at equal intervals, the inside of lifting frame 17 and below cross cavity 18 are fixedly connected with screen plate 19, which can place PCB on screen plate 19, three sides of lifting frame 17 and close to bottom center are all fixedly connected with limit block 20, limit block 20 is fixedly connected with limit rod 21 at center portion and is slidably connected, the two ends of limit rod 21 are fixedly connected with cleaning kettle 1, which can limit lifting frame 17, the other side of lifting frame 17 and close to bottom center are fixedly connected with lifting plate 23, screw rod 22 is connected with the center portion of lifting plate 23 and is screwed, which can rotate screw rod 22 to drive lifting plate 23 to lift, and lifting plate 23 lifting can drive lifting frame 17 to lift.

[0025] Embodiment 2, as Figures 1-5As shown, support legs 2 are fixedly connected at equal intervals to the bottom and near the edge of the cleaning vessel 1, and the bottom of each support leg 2 is trapezoidal; a control panel 3 is installed on the surface of the cleaning vessel 1; a heating cylinder 5 is fixedly connected to the inner wall of the cleaning vessel 1, and a cooling coil 4 is installed inside the inner wall of the cleaning vessel 1; a pressure gauge 11 and a safety pressure relief valve 12 are fixedly installed on the top of the vessel lid 7; an annular groove 13 is opened on the top of the cleaning vessel 1, and an annular plate 14 is embedded inside the annular groove 13; a sealing ring gasket 15 is fixedly connected to the bottom of the annular plate 14, and the top of the annular plate 14 is fixedly connected to the bottom of the vessel lid 7; the top of the screw 22 is rotatably connected to the bearing on the inner wall of the top of the cleaning vessel 1, and the bottom of the screw 22 passes through the bottom of the cleaning vessel 1 and is rotatably connected to its bearing; a drive motor 24 is fixedly connected to the bottom of the cleaning vessel 1, and the output end of the drive motor 24 is fixedly connected to the bottom of the screw 22.

[0026] The overall effect of Embodiment 2 is as follows: Support legs 2 are fixedly connected at equal intervals to the bottom and near the edge of the cleaning vessel 1. The bottoms of the support legs 2 are trapezoidal, which allows the support legs 2 to support the bottom of the cleaning vessel 1. A control panel 3 is installed on the surface of the cleaning vessel 1, which allows the control panel 3 to control the device. A heating cylinder 5 is fixedly connected to the inner wall of the cleaning vessel 1, and a cooling coil 4 is installed inside the inner wall of the cleaning vessel 1, which allows the heating cylinder 5 and the cooling coil 4 to heat and cool the inside of the cleaning vessel 1. A pressure gauge 11 and a safety relief valve 12 are fixedly installed on the top of the vessel lid 7, which can control the pressure of the cleaning vessel. The pressure display and pressure relief function inside the vessel 1 is provided. An annular groove 13 is provided on the top of the vessel 1, and an annular plate 14 is embedded inside the annular groove 13. A sealing ring gasket 15 is fixedly connected to the bottom of the annular plate 14. The top of the annular plate 14 is fixedly connected to the bottom of the vessel cover 7, which can achieve the effect of sealing the vessel cover 7. The top of the screw 22 is rotatably connected to the bearing on the inner wall of the top of the vessel 1. The bottom of the screw 22 passes through the bottom of the vessel 1 and is rotatably connected to its bearing. A drive motor 24 is fixedly connected to the bottom of the vessel 1. The output end of the drive motor 24 is fixedly connected to the bottom of the screw 22, which can achieve the effect of driving the screw 22 to rotate.

[0027] Working principle: The drive motor 24 drives the screw 22 to rotate, controlling the lifting frame 17 to rise to the square hole 6, placing the PCB in the cross cavity 18. The mesh plate 19 supports the PCB, ensuring the slot holes are exposed. Then, the drive motor 24 drives the lifting frame 17 to descend to the designated position inside the cleaning tank 1, and the tank cover 7 is closed. Vacuum is drawn using the pressure extraction pipe 16, reducing the pressure inside the cleaning tank 1 to ≤0.1MPa to eliminate air interference. Liquid CO2 is injected through the CO2 inlet pipe 8, and methanol is injected proportionally (≤5%) through the methanol inlet pipe 9 via the high-precision metering pump 10. The heating cylinder 5 heats the CO2, and the cooling coil 4 controls the temperature, allowing the CO2 to reach a supercritical temperature. At a temperature of 35-60℃ and a pressure of 7.38-30MPa, the drive motor 24 drives the screw 22, causing the lifting frame 17 to slowly rise, fall, and rotate along the limit rod 21. Supercritical CO2 fluid flows in the cross cavity 18, penetrating deep into the PCB slots to dissolve residues. During the cleaning process, the pressure gauge 11 and control panel 3 monitor and adjust the pressure and temperature parameters in real time. After cleaning, the pressure is slowly released through the safety relief valve 12, and the supercritical CO2 returns to a gaseous state, which is then recycled through the pressure extraction pipe 16. The cooling coil 4 cools down the temperature inside the cleaning tank 1 to room temperature. The drive motor 24 controls the lifting frame 17 to rise to the square hole 6, and the PCB is removed, completing the cleaning process.

[0028] The wiring diagrams for the cleaning tank 1, control panel 3, heating cylinder 5, high-precision metering pump 10, pressure gauge 11, safety relief valve 12, pressure extraction pipe 16, and drive motor 24 in this utility model are common knowledge in the field. Their working principles are known technologies, and the appropriate models are selected according to actual use. Therefore, the control methods and wiring layouts for the cleaning tank 1, control panel 3, heating cylinder 5, high-precision metering pump 10, pressure gauge 11, safety relief valve 12, pressure extraction pipe 16, and drive motor 24 will not be explained in detail.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An apparatus for improving poor copper separation after tin plating in PCB slots, comprising a cleaning tank (1), characterized in that: The top of the cleaning vessel (1) has a square hole (6), and the top of the cleaning vessel (1) is covered with a vessel lid (7). The top of the vessel lid (7) is fixed and connected to a CO2 inlet pipe (8) and a methanol inlet pipe (9). A high-precision metering pump (10) is installed on the methanol inlet pipe (9). A pressure-drawing pipe (16) is fixed and connected to the surface of the cleaning vessel (1) near the top. A lifting frame (17) is provided inside the cleaning vessel (1) below the square hole (6). The surface of the lifting frame (17) has cross cavities (18) at equal intervals. Inside the lifting frame (17) and above and below the cross cavity (18), there are fixed mesh plates (19). On three sides of the lifting frame (17) and near the bottom center, there are fixed limit blocks (20). The center of the limit block (20) is slidably connected to a limit rod (21). Both ends of the limit rod (21) are fixedly connected to the cleaning tank (1). On the other side of the lifting frame (17) and near the bottom center, there is a lifting plate (23). The center of the lifting plate (23) is threadedly connected to a screw rod (22).

2. The manufacturing apparatus for improving poor copper separation after tin plating in PCB slots according to claim 1, characterized in that: The bottom of the cleaning vessel (1) is fixedly connected with support legs (2) at equal intervals near the edge, and the bottom of each support leg (2) is trapezoidal.

3. The manufacturing apparatus for improving poor copper separation after tin plating in PCB slots according to claim 1, characterized in that: The surface of the cleaning tank (1) is equipped with a control panel (3).

4. The manufacturing apparatus for improving poor copper separation after tin plating in PCB slots according to claim 1, characterized in that: A heating cylinder (5) is fixedly connected to the inner wall of the cleaning tank (1), and a cooling coil (4) is installed inside the inner wall of the cleaning tank (1).

5. The manufacturing apparatus for improving poor copper separation after tin plating in PCB slots according to claim 1, characterized in that: A pressure gauge (11) and a safety relief valve (12) are fixedly installed on the top of the vessel lid (7).

6. The manufacturing apparatus for improving poor copper separation after tin plating in PCB slots according to claim 1, characterized in that: The top of the cleaning vessel (1) is provided with an annular groove (13), and an annular plate (14) is embedded inside the annular groove (13). A sealing ring gasket (15) is fixedly connected to the bottom of the annular plate (14), and the top of the annular plate (14) is fixedly connected to the bottom of the vessel cover (7).

7. The apparatus for improving copper separation defects after tin plating in PCB slots according to claim 1, characterized in that: The top of the screw (22) is rotatably connected to the bearing on the inner wall of the top of the cleaning tank (1), and the bottom of the screw (22) passes through the bottom of the cleaning tank (1) and is rotatably connected to its bearing. A drive motor (24) is fixedly connected to the bottom of the cleaning tank (1), and the output end of the drive motor (24) is fixedly connected to the bottom of the screw (22).

Images