Flexible traction line tube stretching-type linkage linear three-face projection demonstration board

Abstract

The invention provides a flexible traction line tube stretching-type linkage linear three-face projection demonstration board which is composed of a projection panel, a projection ligature mechanism, a linear projection mechanism and a linkage mechanism. A flexible-rope-driven projection ligature mechanism is used, so that the ligature of the front projection and the horizontal projection of a linear dynamic point are perpendicular to an X axis. The front projection and the side projection of the linear dynamic point are vertical to a Z axis. The scalable linear projection mechanism is used, so that the linear projection length is changeable to meet various location situations of a space line. The linkage mechanism is used to ensure that the distance from the horizontal projection of the dynamic point to the X axis is equal to the distance from the side projection of the dynamic point to the Z axis. When the demonstration board is used, three projection caps of the dynamic point are loosened by a hand; after two projections of the dynamic point are successively moved to specified locations, the projection caps are tightened; the third projection of the dynamic point automatically comes to a correct location; and the projection cap is tightened. According to the invention, a dynamically changing physical teaching aid is used to replace seven constant teaching aids, 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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