Height-adjustable teaching blackboard

Abstract

The invention discloses an height-adjustable blackboard. The height-adjustable blackboard comprises a blackboard body, rope hanging rings, a roll rim of the blackboard body, a support rotating rod, a support rod, a square base, a bolt, a chalk sleeve, a board wiper box and buckles. The rope hanging rings are clamped at the two ends of an upper frame of the blackboard through the buckles. The roll rim of the blackboard body and a lower frame of the blackboard are fixed through a screw. A circular hole is formed in the middle of the roll rim of the blackboard body. The upper end of the support rotating rod is inserted into the circular hole, and the upper end of the support rotating rod is connected with the lower frame of the blackboard body and is fixed through a screw. The lower end of the support rotating rod is inserted into a support rod. The lower end of the support rod is connected with the upper end face of the square base. The lower end of the support rod is inserted from the bottom end of the square base through a screw and is fixed. The bolt is inserted into an inserting opening formed in the support rod and is screwed up through a nut. The chalk sleeve and the board wiper box are arranged on the upper end face of the square base and cling to the support rod. The height-adjustable blackboard has the advantages that the structure is simple, the practicability is strong, and the service life is long; the adjustable-height blackboard is suitable for popularization and application.

Description

technical field [0001] The invention relates to a teaching aid in the field of teaching, in particular to a height-adjustable teaching blackboard. Background technique [0002] Blackboards have been used in teaching and have a long history, but in actual teaching, blackboards are generally fixed on the wall. It is obviously inconvenient for teachers of different heights to teach on the blackboard at the same height; in laboratories, due to the limitation of the experimental environment, some laboratories do not have blackboards on the walls. In the laboratory, there is no written expression on the blackboard but only rely on the language expression of the experimental teacher, which affects the effect of experimental teaching. In order to solve the above problems and make up for the deficiencies of the prior art, the present invention aims to provide a height-adjustable teaching blackboard to meet the teaching requirements of teachers of different heights in the laboratory....

AI Technical Summary

Problems solved by technology

It is obviously inconvenient for teachers of different heights to teach on the blackboard at the same height; in the laboratory, due to the limitation of the experimental environment, some laboratories do not have a blackboard on the wall

In the laboratory, there is no written expression on the blackboard but only rely on the language expression of the experimental teacher, which affects the effect of experimental teaching

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