Leaf free-hand slicer for middle school biology teaching

Abstract

The invention discloses a leaf free-hand slicer for middle school biology teaching. The leaf free-hand slicer comprises an outer sleeve and a spiral indexing plate; a fixing circular table is arranged at the upper end of the outer sleeve; a circular glass sheet is arranged on the fixing circular table; a hinge pin is arranged on one side of the fixing circular table; the upper end of the hinge pin is fixedly connected with a blade through a rotary shaft; an inner sleeve is arranged in the outer sleeve; a spring piece is arranged at the bottom of the sleeve interior of the inner sleeve, and is connected with a limiting plate; an adjusting bolt perpendicularly penetrating through the side walls of the inner sleeve and the outer sleeve is arranged on one side of the limiting plate; the lower end of the outer sleeve is arranged in the spiral indexing plate; scales are formed in the spiral indexing plate; an adjusting rod is arranged in the center of the bottom of the inner side of the spiral indexing plate; and the upper end of the adjusting rod is exactly in contact with the bottom of the inner sleeve. A leaf can be fixed and cut conveniently, slicing is carried out with high precision and the quality of an experiment and teaching is improved.

Description

technical field [0001] The invention relates to an experiment appliance, in particular to a blade freehand slicer used in middle school biology teaching. Background technique [0002] In middle school biology teaching, in the experiment of observing plant mesophyll cells, students are required to slice the leaves by hand. The operation method of free-hand slicing is to place the leaves on the glass first, press the leaves with the index finger of the left hand, and stick the blade with the right hand Cut off a part of the index finger first, and then cut the blade close to the index finger in a parallel direction to obtain thin slices. When students use the blade, it is easy to cut their fingers, which will cause inconvenience to experiments and teaching. In view of this problem, it is necessary to design a special blade slicer , which is convenient for fixing and cutting blades, and has high precision at the same time to improve the quality of experiments and teaching. Co...

AI Technical Summary

Problems solved by technology

[0002] In middle school biology teaching, in the experiment of observing plant mesophyll cells, students are required to slice the leaves by hand. The operation method of free-hand slicing is to place the leaves on the glass first, press the leaves with the index finger of the left hand, and stick the blade with the right hand Cut off a part of the index finger first, and then cut the blade close to the index finger in a parallel direction to obtain thin slices. When students use the blade, it is easy to cut their fingers, which will cause inconvenience to experiments and teaching. In view of this problem, it is necessary to design a special blade slicer , easy to fix and cut blades, and at the same time have high precision to improve the quality of experiments and teaching

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