A glue dropper

Abstract

The invention relates to the field of experiment teaching, in particular to a dropper. The dropper comprises a cutting sleeve, a rubber head, a dropper body, a suction nozzle, a placement groove, a quantitative cap and a limiting piston. The cutting sleeve is arranged on the top of the rubber head. The bottom of the rubber head is connected with one port of the dropper body, and the other port of the dropper body is connected with the suction nozzle. The dropper body is composed of two arc glass sheets and two elastic sliding rails. The arc glass sheets and the elastic sliding rails are arranged in a spaced mode and connected in sequence to form the cylindrical dropper body. The limiting piston is arranged inside the dropper body. The outer diameter of the limiting piston is equal to the inner diameter of the dropper body. Scale marks are engraved in the arc glass sheets in the axial direction of the dropper body, and a plurality of clamping lock pieces are arranged on the elastic sliding rails; the placement groove and the quantitative cap are arranged at the upper portion of the dropper body; the plane where a notch of the placement groove is located is perpendicular to the dropper body and faces the suction nozzle; the quantitative cap is installed inside the placement groove. The dropper can achieve convenient quantitative liquid sampling, can lower the probability that fingers of a person are corroded by corrosive liquid, and is safe and practical.

Description

【Technical field】 [0001] The invention relates to the field of experiment teaching, in particular to a rubber dropper. 【Background technique】 [0002] The rubber dropper, also known as the rubber cap dropper, is an instrument used to draw or drop a small amount of liquid reagents. There are two problems in the use process. One, it is difficult to control the inhalation amount of the reagent when pressing the rubber tip with the forefinger and thumb, which will cause the reagent to flow into the rubber tip; Strong acid liquids such as concentrated sulfuric acid and concentrated nitric acid can only be pipetted with non-corroded materials such as glass products. In some laboratory determination and analysis, a certain amount of strong acid liquid needs to be added in batches. For example, when the soil organic matter is determined by the potassium dichromate oxidation external heating method, 5 ml of concentrated sulfuric acid needs to be added. Aiming at the prior art, the ...

AI Technical Summary

Problems solved by technology

However, its disadvantage is that when quantitatively absorbing reagents, the rubber dropper can only achieve one drop of reagent at a time, and when measuring a large number of samples, it is easy to cause fatigue, reduce the accuracy of the experiment, and even cause mistakes, resulting in strong acid Liquid comes into contact with experimenter's body

In addition, most plastic droppers are made of ordinary glass materials. In the laboratory, it often happens that the plastic droppers are accidentally dropped on the ground, and the plastic droppers are easy to break.

Because the ordinary glass material is hard, lacks elasticity, and is fragile, the plastic dropper made of ordinary glass as a whole is not easy to be protected.

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