Rubber stopper puncher for chemistry laboratory

Abstract

The invention discloses a rubber stopper puncher for a chemistry laboratory. The rubber stopper puncher comprises a base, an outer pipe, a cylinder cutter, a screw shaft and a rubbers stopper clampingdevice. The screw shaft is matched with a sliding plate to drive the cylinder cutter to stretch and contact. The screw shaft is matched with a driving wheel to drive the cylinder cutter to rotate. The cylinder cutter completes punching of a rubber stopper under the double effect of linear movement and circular movement. When the cylinder cutter contracts, a stopper core in the hollow part of thecylinder cutter cannot contract inwards together with the cylinder cutter due to blocking of the driving wheel, the stopper core is blocked outside the cylinder cutter, and the phenomenon that the stopper core remains in the hollow part of the puncher is avoided. A cutting blade of the cylinder cutter is in the shape of saw teeth, the resistance of the cutting blade is smaller than that of a flatcutting blade, more labor is saved during punching, the diameter hole formed through punching better meets the standard, punching conducted through the rubber stopper puncher is safer than punching conducted by manually taking the rubber stopper.

Description

technical field [0001] The invention belongs to the technical field of chemical experiment equipment, in particular to a rubber stopper puncher for chemical laboratories. Background technique [0002] The hole punch is a common tool in chemical laboratories, mainly used for punching holes in the center of rubber stoppers. In chemical experiments, rubber stoppers with holes are often used to connect glass instruments. Therefore, punching holes in rubber stoppers with a hole punch is a skill that students majoring in chemistry must master. [0003] The hole puncher commonly used in the chemical laboratory is a hollow metal rod at present, and one end is a circular opening, and the two sides of the other end extend outwards as handles. When in use, hold the handle with your hand, rotate the puncher, and push it into the rubber plug. After punching with this kind of puncher, a cork core is left in the hollow of the puncher. The friction force of the hollow hole is relatively l...

AI Technical Summary

Problems solved by technology

In addition, the blade of this hole punch is flat, and it is very laborious to punch holes. In the experiment, students often have blisters in their palms

In addition, the use of this hole puncher requires one hand to operate the hole puncher, and the other hand to hold the rubber stopper, which is not easy to operate. During the punching process, the hole diameter will be irregular due to uneven force, which does not meet the requirements.

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