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(一)原理:利用正负压原理来吸取液体和放出液体。 (二)制造方法;1.吸量器外套用有机玻璃制做而成,详见图纸。内管用注射器改制而成,注射器作为产生正负压的主要原件。以按针头端为上端,注射器内管以插入外套管端为上端,相对端为下端,以下简称为上端下端。2.将注射器外套管的下端切掉,上端留30毫米,再把按针头处扩粗,然后把内管上端平
(A) Principle: The principle of positive and negative pressure to draw liquid and release liquid. (B) the manufacturing method; 1. Sucker coat made of plexiglass, see the drawings. The inner tube is made of a syringe, and the syringe is the main element that produces positive and negative pressure. The needle end is the upper end, the syringe inner tube is inserted into the end of the outer sleeve to be the upper end, the opposite end is the lower end, and the following is simply referred to as the lower end of the upper end. 2. The lower end of the syringe outer tube cut off, leaving 30 mm at the top, then the needle at the Department of thickening, and then the upper end of the tube flat