Flexible traction line two-sided projection demo board

Abstract

The invention discloses a two-side projection demonstration board for flexible-traction straight lines. The two-side projection demonstration board for flexible-traction straight lines consists of a projection board, a projection connection line mechanism and a straight line projection mechanism, wherein the projection connection line mechanism comprises a translation frame, a change gear, a change gear shaft, a pulley, a pulley shaft, a flexible rope, a rope frame and a rope frame bolt; the straight line projection mechanism comprises a fixed point, a moving point and a projection connection line. According to the two-side projection demonstration board for flexible-traction straight lines, one end point of the straight line is fixed and the other end point of the straight line is movable; by adoption of a straight line projection telescopic coil spring mechanism and a flexible-traction driving double-pulley structure, the moving point not only can conveniently, rapidly and flexibly lay out 7 straight line positions, but also can ensure that the connection line of front projection and horizontal projection of the moving point of the straight line is vertical to an X axis. During the use, a front projection cap and a horizontal projection cap of the moving point are manually unscrewed, after the moving point is front projected to an appointed position, the front projection cap of the moving point is screwed, and after the moving point is horizontally projected to an appointed position, the horizontal projection cap of the moving point is screwed, so that various space positions of the straight line can be dynamically demonstrated.

Description

technical field [0001] The invention relates to teaching and demonstration teaching aids, in particular to a flexible traction linear double-sided projection demonstration board used in engineering drawing courses. Background technique [0002] In the course of engineering drawing, the spatial position of a straight line is generally determined by the projections on two projection surfaces, that is, the frontal projection and the horizontal projection of the straight line. The straight line is represented by a straight line segment containing two endpoints. It is required to ensure the same endpoint The line connecting the front projection and the horizontal projection is vertical to the X axis. There are seven situations for the position of the space line relative to the projection surface, which are the vertical line, the horizontal line, the lateral horizontal line, the vertical line, the plumb line, the lateral vertical line and the oblique line. In the teaching of engin...

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 two-sided projection on the blackboard, it will take more time. , takes up a lot of blackboard space, and the dynamic demonstration effect is not good

affect the quality of teaching

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