Drying air knife for assembling piston on electronic circuit board

Abstract

The invention relates to the technical field of electronic circuit board assembly, and discloses a drying air knife for assembling a piston on an electronic circuit board. The drying air knife comprises an air knife pipe, the electronic circuit board and a high-pressure fan. Special-shaped clamping walls are fixedly installed on the two sides of an inner cavity of the air knife pipe, and the top end of the air knife pipe is in threaded connection with a rotary button. Through the arrangement of a piston plate, after gas enters from an air inlet pipe, the gas stays for a short time above the piston plate and is subjected to pressure equalizing, the gas can abut against the piston plate to descend to be linearly released, it is guaranteed that the pressure of all positions of an air outlet is the same, then it is guaranteed that the pressure of ejected high-speed airflow is the same, and the air drying quality of the electronic circuit board is improved. Meanwhile, through the arrangement of a spring and the rotary button, the pressure generated when air is ejected downwards from the position above the piston plate can be adjusted by adjusting the height of the piston plate, then the pressure of airflow ejected from the air outlet is adjusted, the rapid response capacity of the air knife in the working process is improved, and the pressure of the high-speed airflow can be adjusted in time according to needs.

Description

technical field [0001] The invention relates to the technical field of electronic circuit board assembly, in particular to a piston drying air knife for electronic circuit board assembly. Background technique [0002] At present, in the assembly process of electronic circuit boards, there is a process of cleaning the circuit boards. In order to speed up the assembly efficiency, it is necessary to use a drying air knife to dry the circuit boards. The principle of the drying air knife used on electronic circuit boards is mainly After the air from the high-pressure fan enters the air knife, it is blown out at high speed by an airflow sheet with a thickness of only 0.05 mm, and then hits the electronic circuit board with high-speed airflow, collides with the water and impurities on it, impacts and carries away, making the electronic circuit board fast. dry, but there are some deficiencies in the existing drying air knife, as follows: [0003] At present, the cross-sectional siz...

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Problems solved by technology

[0003] At present, the cross-sectional size of the air duct of the drying air knife is the same everywhere. When the high-pressure fan sends the air into the air knife through the duct, it blows to the air outlet, and the wind entering the air duct is unevenly distributed and the wind pressure is inconsistent. There is a large difference in wind pressure at both ends of the air duct, among which the wind pressure and wind speed at the air outlet near the air inlet are high, while the wind pressure and wind speed at the air outlet far from the inlet and outlet are small, so the wind force and wind speed blown from the entire bar-shaped air outlet Uneven wind speed leads to different drying speed of electronic circuit boards. Similarly, the pressure of the air outlet cannot be adjusted inside the air knife. control, limited

[0004] The conveyor belt carries the electronic circuit boards through the air knife in turn. After the high-speed airflow hits the electronic circuit board, it carries impurities and water and floats backwards. Part of it falls on the subsequent electronic circuit board, and the other part falls on the equipment, causing pollution to the equipment. Follow-up cleaning is required, which greatly increases the difficulty and cost of cleaning

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