Three-proofing immersion method and device

Abstract

The invention discloses a three-proofing immersion method and device. The three-proofing immersion method comprises the following steps: step 1, forming a through hole matched with a positioning pin in a circuit board; 2, a positioning pin is inserted into the positioning hole; 3, a circuit sleeves the positioning pins through the through holes, positioning of the circuit board is completed, the positioned circuit board is placed on the telescopic columns, and the to-be-protected area corresponds to the through cavity; 4, the three-proofing liquid in the liquid storage tank is pumped into the immersion tank through a circulating pipeline by a pump body; 5, the three-proofing liquid is continuously pumped into the immersion tank, so that the immersion tank is filled with the three-proofing liquid and the three-proofing liquid overflows; and 6, the circuit board is pressed, the circuit board extrudes the telescopic columns to conduct downward pressing, the circuit board descends along the positioning pins until the circuit board abuts against the adaptive columns, at the moment, the circuit board makes contact with the three-proofing liquid and adheres to the three-proofing liquid, the to-be-protected area is located in the through groove, the through groove separates the contact between the to-be-protected area and the three-proofing liquid, and three-proofing treatment of the circuit board is completed.

Description

Technical Field

[0001] The invention relates to the field of three-proofing treatment of circuit boards, and in particular to a three-proofing immersion method and device. Background Art

[0002] The three-proof treatment usually refers to a surface treatment process carried out in the electronics industry to prevent electronic products from being corroded by mold, moisture and salt spray;

[0003] This treatment can improve the reliability, safety factor and service life of the product. It mainly attaches the three-proof paint to the circuit board. The three-proof paint is also called PCB electronic circuit board protective oil. It is a specially formulated coating with good high and low temperature resistance. After curing, it forms a transparent protective film that can effectively prevent water, moisture and dust, and enhance resistance to cold and heat shock, aging, radiation, ozone corrosion, vibration, high flexibility and strong adhesion.

[0004] At present, the method of spraying is adopted when coating circuit boards with conformal coating. However, due to the presence of electronic components, plug-in electrolytics, common mode inductors, through-hole pads, burning ports, etc. on the circuit boards, it is very easy to spray the conformal coating liquid on these components during spraying, thus affecting the subsequent normal operation of the components or even damaging the components. Summary of the invention

[0005] Purpose of the invention: To provide a triple-proof immersion method and device to solve the above-mentioned problems existing in the prior art.

[0006] Technical solution: A three-proof immersion method, including:

[0007] Step 1, opening a through hole on the circuit board that matches the positioning pin;

[0008] Step 2: Insert the positioning pin into the positioning hole;

[0009] Step 3: Put the circuit onto the positioning pin through the through hole to complete the positioning of the circuit board, and place the positioned circuit board on the telescopic column, with the area to be protected corresponding to the through cavity;

[0010] Step 4: Pump the three-proof liquid in the liquid storage tank into the immersion tank through the circulation pipeline by the pump body;

[0011] Step 5, continue to pump the three-proof liquid, so that the immersion tank is full of the three-proof liquid and overflows. At this time, part of the three-proof liquid overflows into the liquid storage tank through the cavity wall of the through cavity. At this time, the three-proof liquid flows into the liquid storage tank along the cavity wall of the through cavity without contacting the area to be protected; part of the three-proof liquid overflows into the liquid storage tank through the trough wall of the immersion tank, and the three-proof liquid in the immersion tank is always kept full of liquid;

[0012] Step 6. Press the circuit board. The circuit board squeezes the telescopic column to press down. The circuit board descends along the positioning pin until it abuts against the adapter column. At this time, the circuit board contacts the three-proof liquid and completes the attachment. At this time, the area to be protected is located in the through groove. The through groove separates the contact between the area to be protected and the three-proof liquid, completing the three-proof treatment of the circuit board.

[0013] A triple-proof immersion device, comprising:

[0014] An immersion part, used to attach the three-proof liquid to a predetermined position of the circuit board;

[0015] The liquid storage tank is arranged below the immersion part and is used for storing a predetermined amount of three-proof liquid and catching the three-proof liquid overflowing from the immersion part.

[0016] In a further embodiment, the immersion portion comprises:

[0017] an immersion tank, located above the liquid storage tank;

[0018] A plurality of adapter columns are provided and installed in the immersion tank, wherein a through cavity of a predetermined shape and passing through the immersion tank is formed in the adapter column;

[0019] A plurality of positioning posts are provided and installed in the immersion tank. A positioning hole is provided on the positioning post, and a positioning pin is fitted in the positioning hole.

[0020] The telescopic parts are designed in multiple numbers and are installed in the immersion tank.

[0021] The present invention designs an immersion tank, and designs an adapter column and a telescopic part in the immersion tank, and designs a through groove in the adapter column. During the three-proof treatment, the three-proof liquid is continuously injected into the immersion tank to make it overflow. At this time, the circuit board is pressed, and the circuit board squeezes the telescopic column to press down. The circuit board descends along the positioning pin until it abuts against the adapter column, so that the circuit board contacts the three-proof liquid and completes the attachment. At this time, the area to be protected is located in the through groove, and the through groove separates the contact between the area to be protected and the three-proof liquid, completing the three-proof treatment of the circuit board. Compared with the traditional spraying method, the present method is immersion-type, and the contact between the area to be protected and the three-proof liquid is separated by the through groove, so as to avoid the contact between the three-proof liquid and the area to be protected.

[0022] In a further embodiment, the telescopic member includes a telescopic seat installed in the immersion tank, a telescopic column arranged in the telescopic seat and adapted to the telescopic seat, and a spring is provided between the telescopic column and the telescopic seat.

[0023] In a further embodiment, a circulation pipeline is provided between the immersion tank and the liquid storage tank, a pump body is provided on the circulation pipeline, and an input motor is provided at the input end of the pump body.

[0024] In a further embodiment, the telescopic column is higher than the adapter column and lower than the positioning pin in a natural state.

[0025] In a further embodiment, the adapter column is on the same level as the wall of the immersion tank.

[0026] Beneficial effect: The present invention discloses a three-proof immersion method and device. The present invention designs an immersion tank, an adapter column and a telescopic part in the immersion tank, and a through groove in the adapter column. During the three-proof treatment, the three-proof liquid is continuously injected into the immersion tank to make it overflow. At this time, the circuit board is pressed, and the circuit board squeezes the telescopic column to press down. The circuit board descends along the positioning pin until it abuts against the adapter column, so that the circuit board contacts the three-proof liquid and completes the attachment. At this time, the area to be protected is located in the through groove, and the through groove separates the contact between the area to be protected and the three-proof liquid, completing the three-proof treatment of the circuit board. Compared with the traditional spraying method, this method is immersion-type, and the contact between the area to be protected and the three-proof liquid is separated by the through groove, thereby avoiding the contact between the three-proof liquid and the area to be protected, thereby avoiding the contact between the three-proof liquid and electronic components, plug-in electrolytics, common mode inductors, through-hole pads, burning ports and other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the immersion part of the present invention.

[0029] The accompanying drawings are marked as follows:

[0030] 1. Liquid storage tank; 2. Immersion part; 21. Immersion tank; 22. Adapter column; 23. Positioning hole; 24. Telescopic column;

[0031] 3. Circulation pipeline; 4. Pump body. DETAILED DESCRIPTION

[0032] The present application relates to a triple-proof immersion method and device, which is explained in detail below through specific implementation methods.

[0033] A triple-proof immersion method, comprising:

[0034] Step 1, opening a through hole on the circuit board that matches the positioning pin;

[0035] Step 2, inserting the positioning pin into the positioning hole 23;

[0036] Step 3: Place the circuit on the positioning pin through the through hole to complete the positioning of the circuit board, and place the positioned circuit board on the telescopic column 24, with the area to be protected corresponding to the through cavity;

[0037] Step 4: Pump the three-proof liquid in the liquid storage tank 1 into the immersion tank 21 through the circulation pipe 3 by the pump body 4;

[0038] Step 5, continue to pump the three-proof liquid, so that the immersion tank 21 is filled with the three-proof liquid and overflows. At this time, part of the three-proof liquid overflows into the liquid storage tank 1 through the cavity wall of the through cavity. At this time, the three-proof liquid flows into the liquid storage tank along the cavity wall of the through cavity without contacting the area to be protected; part of the three-proof liquid overflows into the liquid storage tank 1 through the tank wall of the immersion tank 21, and the three-proof liquid in the immersion tank 21 is always kept full of liquid;

[0039] Step 6, press the circuit board, the circuit board squeezes the telescopic column 24 to press down, the circuit board descends along the positioning pin until it abuts against the adapter column 22, at this time the circuit board is in contact with the three-proof liquid and the attachment is completed, at this time the area to be protected is located in the through groove, the through groove separates the contact between the area to be protected and the three-proof liquid, and the three-proof treatment of the circuit board is completed.

[0040] In actual three-proof treatment, for efficiency and assembly line work, an input conveyor belt and an output conveyor belt can be designed at both ends of the three-proof immersion device, and a multi-axis manipulator can be designed above the three-proof immersion device. A suction cup is designed on the multi-axis manipulator, and the circuit board placed on the input conveyor belt is adsorbed by the multi-axis manipulator and moved to the three-proof immersion device to complete the three-proof treatment;

[0041] A multi-axis manipulator can use a three-axis manipulator;

[0042] In order to ensure that the circuit board immersed in the three-proof liquid contacts the surface of the output conveyor belt when it is placed on the output conveyor belt and is not completely dry, a support column can be designed on the output conveyor belt, and a notch adapted to the area to be protected can be opened on the support column to support the circuit board immersed in the three-proof liquid and prevent the circuit board immersed in the three-proof liquid from contacting the output conveyor belt;

[0043] A triple-proof immersion device, comprising:

[0044] The immersion part 2 is used to attach the three-proof liquid to a predetermined position of the circuit board;

[0045] The liquid storage tank 1 is arranged below the immersion part 2 and is used for storing a predetermined amount of the three-proof liquid and catching the three-proof liquid overflowing from the immersion part 2 .

[0046] The immersion part 2 comprises:

[0047] An immersion tank 21 is located above the liquid storage tank 1;

[0048] A plurality of adapter columns 22 are provided and installed in the immersion tank 21. A through cavity of a predetermined shape and penetrating the immersion tank 21 is provided in the adapter column 22;

[0049] A plurality of positioning posts are provided and installed in the immersion tank 21. A positioning hole 23 is formed on the positioning post, and a positioning pin is fitted in the positioning hole 23.

[0050] The telescopic parts are designed in multiple numbers and are installed in the immersion tank 21.

[0051] The present invention designs an immersion tank 21, and designs an adapter column 22 and a telescopic part in the immersion tank 21, and designs a through groove in the adapter column 22. During the three-proof treatment, the three-proof liquid is continuously injected into the immersion tank 21 to make it overflow. At this time, the circuit board is pressed, and the circuit board squeezes the telescopic column 24 to press down. The circuit board descends along the positioning pin until it abuts against the adapter column 22, so that the circuit board contacts the three-proof liquid and completes the attachment. At this time, the area to be protected is located in the through groove, and the through groove separates the contact between the area to be protected and the three-proof liquid, completing the three-proof treatment of the circuit board. Compared with the traditional spraying method, this method is immersion-type, and the contact between the area to be protected and the three-proof liquid is separated by the through groove, thereby avoiding the contact between the three-proof liquid and the area to be protected.

[0052] The area to be protected is the location area formed after electronic components, plug-in electrolytics, common mode inductors, through-hole pads, burning ports and other components are installed on the circuit board.

[0053] The telescopic member includes a telescopic seat installed in the immersion tank 21, a telescopic column 24 arranged in the telescopic seat and adapted to the telescopic seat, and a spring is provided between the telescopic column 24 and the telescopic seat.

[0054] A circulation pipeline 3 is provided between the immersion tank 21 and the liquid storage tank 1 , and a pump body 4 is provided on the circulation pipeline 3 .

[0055] In a natural state, the telescopic column 24 is higher than the adapting column 22 and lower than the positioning pin.

[0056] The adapting column 22 is on the same level as the wall of the immersion tank 21 .

[0057] Working principle description:

[0058] A through hole adapted to the positioning pin is provided on the circuit board;

[0059] Insert the positioning pin into the positioning hole 23;

[0060] Place the circuit board on the telescopic column 24, with the area to be protected corresponding to the through cavity, and put the circuit board on the positioning pin through the through hole to complete the positioning of the circuit board;

[0061] The three-proof liquid in the liquid storage tank 1 is pumped into the immersion tank 21 through the circulation pipe 3 by the pump body 4;

[0062] Continue to pump in the three-proof liquid, so that the immersion tank 21 is filled with the three-proof liquid and overflows. At this time, part of the three-proof liquid overflows into the liquid storage tank 1 through the cavity wall of the through cavity, and part of the three-proof liquid overflows into the liquid storage tank 1 through the groove wall of the immersion tank 21, and the three-proof liquid in the immersion tank 21 is always kept full of liquid;

[0063] Press the circuit board, the circuit board squeezes the telescopic column 24 to press down, and the circuit board descends along the positioning pin until it abuts against the adapter column 22. At this time, the circuit board contacts the three-proof liquid and completes the attachment. At this time, the area to be protected is located in the through groove, and the through groove separates the contact between the area to be protected and the three-proof liquid, completing the three-proof treatment of the circuit board.

[0064] The preferred specific embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above specific embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A three-proof immersion method, characterized in that: include: Step 1, opening a through hole on the circuit board that matches the positioning pin; Step 2: insert the positioning pin into the positioning hole (23); Step 3: Place the circuit on the positioning pin through the through hole to complete the positioning of the circuit board, and place the positioned circuit board on the telescopic column (24), with the area to be protected corresponding to the through cavity; Step 4: pumping the three-proof liquid in the liquid storage tank (1) into the immersion tank (21) through the circulation pipe (3) by the pump body (4); Step 5, continuously pumping in the three-proof liquid, so that the immersion tank (21) is filled with the three-proof liquid and overflows; Step 6, press the circuit board, the circuit board squeezes the telescopic column (24) to press down, the circuit board descends along the positioning pin until it abuts against the adapter column (22), at this time the circuit board contacts the three-proof liquid and completes the attachment, at this time the area to be protected is located in the through groove, the through groove separates the contact between the area to be protected and the three-proof liquid, and the three-proof treatment of the circuit board is completed.

2. A three-proof immersion method according to claim 1, characterized in that: When the three-proof liquid overflows in step 5, part of the three-proof liquid overflows through the cavity wall of the through cavity into the liquid storage tank (1). At this time, the three-proof liquid flows into the liquid storage tank (1) along the cavity wall of the through cavity without contacting the area to be protected; Part of the three-proof liquid overflows through the wall of the immersion tank (21) into the liquid storage tank (1), so that the three-proof liquid in the immersion tank (21) is always kept in a full-load state.

3. A three-proof immersion device, used to implement the three-proof immersion method according to any one of claims 1-2, characterized in that: include: An immersion portion (2) is used to attach the triple-proof liquid to a predetermined position of the circuit board; The liquid storage tank (1) is arranged below the immersion part (2) and is used to store a predetermined amount of triple-proof liquid and to receive the triple-proof liquid overflowing from the immersion part (2).

4. The triple-proof immersion device according to claim 3 is characterized in that: The immersion part (2) comprises: An immersion tank (21) is located above the liquid storage tank (1); A plurality of adapter columns (22) are designed and installed in the immersion tank (21), and a through cavity of a predetermined shape and penetrating the immersion tank (21) is opened in the adapter column (22); A plurality of positioning posts are provided and installed in the immersion tank (21). A positioning hole (23) is formed on the positioning post, and a positioning pin is adapted to be disposed in the positioning hole (23); The telescopic parts are designed in multiple numbers and are installed in the immersion tank (21).

5. The triple-proof immersion device according to claim 4, characterized in that: The telescopic member comprises a telescopic seat installed in the immersion tank (21), a telescopic column (24) arranged in the telescopic seat and adapted to the telescopic seat, and a spring is provided between the telescopic column (24) and the telescopic seat.

6. The triple-proof immersion device according to claim 4 is characterized in that: A circulation pipeline (3) is provided between the immersion tank (21) and the liquid storage tank (1), and a pump body (4) is provided on the circulation pipeline (3).

7. The triple-proof immersion device according to claim 5, characterized in that: In a natural state, the telescopic column (24) is higher than the adapting column (22) and lower than the positioning pin.

8. The triple-proof immersion device according to claim 5, characterized in that: The adapting column (22) is on the same horizontal plane as the wall of the immersion tank (21).

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