Demonstration board for flexible traction linear two-sided projection with space model

Abstract

The invention relates to a two-side projection demonstration board with a space model for flexible-traction straight lines. The two-side projection demonstration board comprises a projection board, space straight line model mechanism, a projection connection mechanism, a straight line projection mechanism and a linkage mechanism. On the basis of an original two-side projection demonstration board for flexible-traction straight lines, the two-side projection demonstration board provided by the invention is additionally provided with a space model and adopts a structure in which the straight line space model is in linkage with straight line projection, thereby being capable of more visually showing a relation between the change in position of the space straight line and the change in projection of the space straight line. The two-side projection demonstration board is convenient to operate, horizontal projection of a moving point can be pulled automatically by only controlling front projection of the moving point in use, and seven positions such as a frontal line, a horizontal line, a profile line, a normal line, a plumb line, a frontal-horizontal line and a slope line of the space straight line can be demonstrated. The demonstration effect is significantly improved. The straight line two-side projection demonstration board is enabled to be more perfect.

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 with a space model 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 th...

AI Technical Summary

Problems solved by technology

If physical model teaching aids are used, each teaching aid is fixed. Its disadvantage is that it is bulky and inconvenient to carry, move and hang. Large blackboard space, and the dynamic presentation effect is not good

affect the quality of teaching

The author invented the flexible traction linear two-sided projection demonstration board (2016103993227) before. Although the above problems are solved, there is no linear space model, and it is impossible to vividly and directly demonstrate the linear changes in space and the corresponding projection changes.

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