Two-side projection demonstration board with space model for flexile-traction straight lines
A technology of projection board and front projection, applied in the field of teaching and demonstration teaching aids, can solve problems such as multi-time, no linear space model, large blackboard space, etc., to achieve the effect of convenient operation and improved demonstration effect
Active Publication Date: 2017-03-22
GUANGZHOU HUALI SCI & TECH VOCATIONAL COLLEGE
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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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[0032] exist Figure 1 to Figure 13 Among them, the structural composition of the present invention and the connection and positional relationship of parts are shown, which are also examples of oblique lines. The flexible traction linear double-sided projection demonstration board with a space model includes a projection board (19), a space linear model mechanism, a projection connection mechanism, a linear projection mechanism and a linkage mechanism.
[0033] The projection board (19) is a thin plate with an X-axis connection (13) on its front, an orthographic projection surface above the X-axis connection (13), and a horizontal projection surface below the X-axis connection (13). Let the right endpoint of the space straight line segment be the fixed point, and the left endpoint be the moving point. On the projection plate (19), fixed-point orthographic projection surfaces and horizontal projections are respectively provided with fixed-point slots (25), and the fixed-point ...
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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...
Claims
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IPC IPC(8): G09B25/00
CPCG09B25/00
Inventor 李延斌郭辉孙学雁
Owner GUANGZHOU HUALI SCI & TECH VOCATIONAL COLLEGE