Linear three-sided projection demonstration board with flexible traction angle split line linkage

Abstract

A linear three-sided projection demonstration board with flexible traction angle and line linkage, which 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 makes the front of the linear moving point The connection line between projection and horizontal projection guarantees the vertical X axis, and the front projection and side projection of the moving point of the straight line guarantees the vertical Z axis; the retractable linear projection mechanism is used to make the projection length of the straight line changeable to meet the conditions of various positions of the space straight line ;A linkage mechanism is used to ensure that the distance from the horizontal projection of the same point to the X-axis is equal to the distance from the side projection to the Z-axis. When in use, turn the three projection caps of the loose point 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 will be linked to 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 flexible traction angle and line-dividing linkage 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 situatio...

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

Images