Linear three-sided projection demonstration board with flexible traction tube stretching linkage

Abstract

The invention relates to a linear three-sided projection demonstration board with a stretching linkage of a flexible traction wire tube. It is composed of a projection board, a projection connection mechanism, a linear projection mechanism and a linkage mechanism; the projection connection mechanism driven by a flexible rope ensures that the front projection of the linear moving point and the horizontal projection connection line ensure the vertical X axis, and the front of the straight moving point Projection and side projection guarantee vertical Z axis. The retractable linear projection mechanism is adopted, so that the projection length of the straight line can be changed to meet the conditions of various positions of the straight line in space. A linkage mechanism is used to ensure that the distance from the horizontal projection of the moving point to the X-axis is equal to the distance from the side projection of the moving point to the Z-axis. When in use, loosen the three projection caps by hand, move the two projections of the moving point to the specified position in turn and then tighten the projection cap, the third projection of the moving point will automatically reach the correct position, and then tighten the projection cap. The present invention replaces seven constant teaching aids with one dynamically changeable physical teaching aid, and the dynamic demonstration effect is significantly improved.

Description

technical field [0001] The invention relates to teaching and demonstration teaching aids, in particular to a linear three-sided projection demonstration board with a stretching linkage of a flexible traction line tube used in engineering drawing courses. Background technique [0002] In the engineering drawing course, the spatial position of the straight line is determined by the projection on the three projection planes, that is, the front projection, horizontal projection and side projection of the straight line. The straight line is represented by a straight line segment containing two endpoints, and the same The connection line between the front projection and the horizontal projection of the endpoint is vertical to the X axis, and the connection line between the front projection and the side projection is vertical to the Z axis. The distance from the horizontal projection to the X axis is equal to the distance from the side projection to the Z axis. There are seven situ...

AI Technical Summary

Problems solved by technology

If physical model teaching aids are used, each teaching aid is fixed, and its disadvantage is that it is bulky, and it is inconvenient to carry, carry, move and hang. If it is used to draw its three-sided projection on the blackboard, it will take more time. , takes up a lot of space on the blackboard, and the dynamic demonstration effect is not good

affect the quality of teaching

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