CN102240654A - A kind of PCB board surface cleaner and cleaning method - Google Patents

Abstract

The invention discloses a PCB surface cleaner and a cleaning method, wherein the cleaner comprises an outer cover and a cleaning device, and is characterized in that: the cleaning device is provided with a strip-shaped hairbrush (2), a dust collecting and air sucking groove (3) and an ion air knife; the strip-shaped hairbrush (2), the dust collecting and air sucking groove (3) and the ion air knife are arranged in the outer cover in sequence; the ion wind knife in the cleaning device is at least provided with an ion generator (5) and an ion wind rod body (7); the ion generator (5) is arranged in the ion wind rod body (7), and the ion wind rod body (7) is respectively provided with a front air outlet (4) and a rear air outlet (6) in front of and behind the ion generator (5).

Description

A kind of PCB board surface cleaner and cleaning method

technical field

The invention relates to the technical field of PCB production, and in particular provides a PCB board surface cleaner and a cleaning method.

Background technique

After the inner layer etching process and before the browning process, the multi-layer PCB circuit board needs to go through the automatic optical inspection machine to check the quality of the circuit board. In order to ensure the quality of the inspection, the PCB board must be used before entering the automatic optical inspection machine. The sticky roller collects the dust, and then cooperates with the sticky paper to clean the dust on the electrostatic sticky roll. This traditional cleaning method leads to low production efficiency and consumes a lot of sticky paper, which seriously increases the production cost. In the traditional cleaning method, one piece of sticky paper is consumed every 10 times of board cleaning, and each automatic optical inspection machine needs to inspect 3,000 PCB boards every day, which means that 300 pieces of sticky paper are consumed every day. An electrostatic sticky dust reel will be consumed every three months.

Chinese patent 200920054480.4 (an upper dust collection device for a PCB cleaning machine) discloses an upper dust collection device for a PCB cleaning machine, including "two side frame plates, and a freely rotatable The dust collecting wheel also includes a rotating shaft whose two ends are fixedly connected to the cleaning machine. It is connected with a counterweight rod to increase the pressure, and the middle part is detachably connected to the dust collection wheel; using the principle of leverage, a counterweight rod is installed on the traditional side frame to ensure the contact between the dust collection wheel and the sticky wheel group Through the cooperation of the fixed ejector pin and the movable ejector pin, the dust collection wheel can be easily disassembled and cleaned at any time.” This solution has made some improvements to the traditional cleaning method, but it still cannot be separated from the dust collection wheel and sticky wheel. Set of means for dust removal.

Contents of the invention

The purpose of the present invention overcomes the defects of the prior art, and provides a PCB surface cleaning device and a new PCB surface cleaning method integrating the ion air knife dedusting technology. The device has the characteristics of high efficiency, energy saving and environmental protection.

The object of the invention is achieved as follows:

A PCB board surface cleaner, comprising an outer cover and a cleaning device, characterized in that: the cleaning device is provided with a strip brush, a dust collection suction groove and an ion air knife; a strip brush, a dust collection suction groove and The ion air knives are arranged side by side and installed in the outer cover.

The ion wind knife in the described cleaning device has at least an ion generator and an ion wind rod body; the ion generator is located in the ion wind rod body, and the ion wind rod body is respectively provided with a front air outlet and a Rear air outlet.

The dust-collecting suction slot is connected to the suction device through a hose; the air inlet of the ion air knife is connected to the air supply device through a trachea.

As an optimization, there are two or more cleaning devices distributed in parallel in the outer cover, and the cleaning devices are connected in parallel through hoses; the strip brush and ion air knife are respectively passed through a height-adjustable The mechanism is installed in the outer cover.

The following is a cleaning method based on the above-mentioned PCB board surface cleaner, which is characterized in that: comprising the steps:

Step 1. The strip brush of the PCB surface cleaner is in contact with the PCB to loosen the dust particles attached to the surface of the PCB;

Step 2. The dust collection and suction groove of the PCB board surface cleaner generates negative air pressure, but when the PCB passes through the dust collection and suction groove area, part of the dust particles are sucked away under the negative pressure;

Step 3. The positive air pressure is blown out from the front air outlet of the ion wind rod body of the PCB surface cleaner, so that it forms an air pressure difference with the positive and negative air pressure junction area between the dust collection suction slot;

Step 4. The ion carried by the airflow formed by the air pressure difference between the front air outlet of the ion wind rod body and the dust collection suction groove removes the static electricity on the PCB surface and takes away the dust particles on the PCB surface.

Step 5: The rear air outlet (4) of the ion wind rod body (7) of the PCB board surface cleaner blows out positive air pressure, and the formed ion wind removes static electricity on the PCB surface again and takes away the remaining dust particles on the PCB surface.

As an optimization, the negative air pressure formed by the dust collection suction groove (3) is -0.2mpa to -0.8mpa; The positive air pressure is 0.2mpa to 0.8mpa.

In summary, the PCB board surface cleaner has the following characteristics and remarkable effects:

1. Use a new type of cleaning method, and replace the traditional electrostatic sticky roller and sticky paper;

2. Reduce the labor intensity of operators and reduce the action of cleaning the board surface by hand. Before the inspection action is performed on the table surface of the automatic optical inspection machine, when passing through the new board surface cleaner, the strip brush and ion air knife will automatically clean the board surface. The board surface is clean;

3. The PCB surface cleaner can improve production efficiency, at least the detection time of each PCB board can be shortened by 1-2 seconds, and on average, each automatic optical inspection machine can scan 3000 surfaces per day, that is to say, by using a new type of PCB The board cleaner can save 3000-6000 seconds per automatic optical inspection machine per day, greatly improving production efficiency.

Description of drawings

Fig. 1 is the structural representation of embodiment one;

Fig. 2 is a schematic structural diagram of the second embodiment.

Detailed ways

Embodiment one

As shown in FIG. 1 , the PCB board surface cleaner of the present invention is composed of an outer cover 1 and a cleaning device. Its cleaning device is made up of bar type hair brush 2, dust collection suction groove 3, ion air knife.

As shown in Figure 1, the ion wind cutter has a front air outlet 4, an ion generator 5, a rear air outlet 6, an ion wind rod body 7, and an ion wind rod fixed adjustment mechanism 8. The ion air knife is fixedly installed in the outer cover 1 through the ion air rod fixing adjustment mechanism 8, and the distance between the ion air knife and the PCB board is adjusted. The ion generator 5 is installed in the ion wind rod body 7, and is used to generate charged ions to remove the static electricity of the dust on the PCB. The ion wind rod fixed adjustment mechanism 8 is respectively provided with a front air outlet 4 and a rear air outlet 6 at the front and back, so that the formed ion wind is divided into two outlets and blown to the PCB board to form a double destaticizing treatment. The front and rear air outlets can achieve the purpose of dust removal by controlling the specific airflow output within 0.2 to 0.8MPa or other ranges. The air outlet of the ion air knife is downward, but it will not touch the board surface. The air inlet 11 of the ion wind rod body 7 is connected with the air supply device through a trachea (such as a flexible pipe). The air supply device (not shown) can be installed in the outer cover 1, and also can be placed outside the whole cleaner.

As shown in Figure 1 again, the bar type hairbrush 2 of its cleaning device, the dust collection suction groove 3, the ion air knife are arranged side by side successively and are installed in the outer cover. The distance between the strip brush 2 and the PCB board can be adjusted through a height-adjustable mechanism or means, so as to ensure dust removal without causing damage to the PCB board. Dust collection suction groove 3 becomes trapezoidal (can be designed into other shapes as required), has a suction outlet 9 above it, and suction outlet 9 is connected with suction device 12 (seeing Fig. 2) by flexible pipe. The suction device 12 can be installed in the outer cover 1, and also can be placed outside the whole cleaner. The suction device 12 generates a negative air pressure of -0.2mPa to -0.8mpa through the suction fan, so that when the PCB passes through the bottom of the dust collection suction slot, some dust particles will be sucked away due to the negative pressure.

A cleaning method based on the above-mentioned PCB board surface cleaner, is characterized in that: comprises the steps:

Step 1. The strip brush 2 of the PCB surface cleaner is in contact with the PCB to loosen the dust particles attached to the surface of the PCB;

Step 2: The dust collection and suction groove 3 of the PCB board surface cleaner generates negative air pressure, but when the PCB passes through the area of the dust collection and suction groove 3, part of the dust particles are sucked away under the negative pressure;

Step 3: The positive air pressure is blown out from the front air outlet 4 of the ion wind rod body 7 of the PCB board surface cleaner, so that it forms an air pressure difference with the positive and negative air pressure junction area between the dust collection suction groove 3;

Step 4. The ions carried by the airflow formed by the air pressure difference between the front air outlet 4 of the ion wind rod body 7 and the dust collection suction groove 3 remove the static electricity on the PCB surface and take away the dust particles on the PCB surface;

Step 5: The rear air outlet 4 of the ion wind rod body 7 of the PCB board surface cleaner blows out positive air pressure, and the formed ion wind removes static electricity on the PCB surface again and takes away the remaining dust particles on the PCB surface.

The following is a further description of the working principle of the PCB board cleaner:

First, the PCB surface cleaner is fixedly installed on the PCB automatic production line through its own structure or external accessories;

The PCB board moves on the automatic production line. The board surface passes through the PCB board surface cleaner. First, the PCB will first pass through the strip brush 2. The strip brush 2 is in contact with the PCB board. It can play a role in dust particles attached to the surface of the PCB. Loosening effect;

Then, the PCB will enter the area covered by the dust collection suction slot 3, and the dust collection suction slot 3 uses the suction fan of the suction device to generate a negative air pressure of -0.2mPa to -0.8mpa from its suction outlet 9, In this way, when the PCB passes under the dust collection and suction slot, some dust particles will be sucked away due to the negative pressure; the PCB will go through the first dust removal process;

Then the PCB enters the area where the front air outlet 4 of the ion wind rod body 7 and the dust collection suction groove are in the junction, because the front air outlet 4 of the ion wind rod body 7 blows out a positive air pressure of 0.2 to 0.8mPa, and the dust collection suction The negative air pressure in the air groove is -0.2mPa to -0.8mpa, so that an air pressure difference of 0.4 to 1.6mPa will be formed in the area where the positive and negative air pressures meet, and this air pressure difference can form a very strong airflow on the surface of the PCB. The airflow is sufficient to take away the dust particles on the surface of the PCB, and at the same time, the ion wind can eliminate the surface static electricity of the dust particles, further reducing the adsorption force between the dust particles and the PCB surface, which fully ensures that all the dust particles on the PCB surface can be taken away; The PCB is subjected to the second dedusting treatment stage;

Finally, the PCB enters the area of the rear air outlet 6 of the ion wind rod body 7, and the ion wind at the rear air outlet 6 de-staticizes and removes dust from the PCB to achieve a thorough cleaning of the board surface.

Embodiment two

As shown in Figure 2, the difference between the PCB surface cleaner of this embodiment and Embodiment 1 is that there are two (or more than two) cleaning devices distributed in parallel in the outer cover, and the cleaning devices are connected in parallel through hoses. For air extraction device 12 and air supply device. The working principle of the PCB surface cleaner with this structure is similar to that of Embodiment 1, and can perform multiple dust removal treatments on the same PCB, and can increase the movement speed of the PCB board on the dust removal process production line and improve production efficiency. The number of cleaning devices can be increased according to needs, and the more stringent PCB cleaning function requirements can be achieved by controlling the wind speed between cleaning devices.

In summary, the two embodiments of the PCB surface cleaner are only preferred implementations. Specific manufacturers can make partial additions and deletions, and do equivalent changes or modifications without departing from the core of the PCB cleaning principle. All are included in the protection scope of the patent application of the present invention.

Claims (8)

1. A PCB board surface cleaner, comprising an outer cover and a cleaning device, is characterized in that: the cleaning device is provided with a strip brush (2), dust collection suction groove (3) and ion air knife; The brushes (2), the dust collection suction slots (3) and the ion air knives are arranged side by side successively and installed in the outer cover. 2. PCB board surface cleaner as claimed in claim 1, is characterized in that: the ion wind knife in the described cleaning device has at least one ion generator (5) and ion wind rod body (7); (5) be located in the ion wind rod rod body (7), the ion wind rod rod body (7) is respectively provided with front air outlet (4) and rear air outlet (6) before and after ion generator (5). 3. The PCB board surface cleaner as claimed in claim 2, characterized in that: the dust collection suction groove (3) is connected with the air extraction device through a flexible pipe; the air inlet (11) of the ion air knife passes through The air pipe is connected with the air supply device. 4. The PCB board surface cleaner as claimed in any one of claims 1, 2 or 3, wherein two or more cleaning devices distributed in parallel are arranged in the outer cover, and the cleaning devices are connected in parallel by hoses. . 5. The PCB board surface cleaner according to any one of claims 1, 2 or 3, characterized in that the strip brush (2) and the ion air knife are respectively installed in the outer cover by a height-adjustable mechanism . 6. A PCB surface cleaning method, which is a method for realizing PCB surface cleaning by the PCB surface cleaner described in any one of claims 1 to 5, characterized in that: comprising the following steps: Step 1. The strip brush (2) of the PCB surface cleaner is in contact with the PCB to loosen the dust particles attached to the surface of the PCB; Step 2: The dust collection and suction groove (3) of the PCB board surface cleaner generates negative air pressure, but when the PCB passes through the area of the dust collection and suction groove (3), part of the dust particles are sucked away under the negative pressure; Step 3. The front air outlet (4) of the ion wind rod body (7) of the PCB board surface cleaner blows out Positive air pressure makes it form an air pressure difference with the area where the positive and negative air pressures intersect between the dust collection and suction slot (3); Step 4. The ion carried by the airflow formed by the air pressure difference between the front air outlet (4) of the ion wind rod body (7) and the dust collection suction groove (3) removes the static electricity on the PCB surface and takes away the dust particles on the PCB surface . 7. PCB surface cleaning method as claimed in claim 6, is characterized in that, also has step 5: the rear air outlet (4) of the ion wind stick body (7) of PCB surface cleaner blows out positive air pressure, and The formed ion wind removes static electricity on the PCB surface and takes away the remaining dust particles on the PCB surface. 8. The PCB surface cleaning method as claimed in claim 6 or 7, characterized in that, the negative air pressure formed in the dust collection and suction groove (3) is -0.2mpa to -0.8mpa; The positive air pressure of the front air outlet (4) and the rear air outlet (4) of (7) is 0.2mpa to 0.8mpa.

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