A 4D classroom
A classroom and 4D technology, applied in educational appliances, electronically operated teaching aids, optics, etc., can solve the problems of inability to consider data mining and data statistics, low efficiency on behalf of signing, incompatibility, etc., so as to improve teaching quality and improve teaching. effect of the way
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Embodiment 2
[0045] Embodiment 2: different from embodiment 1, the shape of cleaning cloth 14 is different, and the cloth strip among the embodiment 1 is common rectangular cloth strip, as Figure 9 and Figure 10 As shown, the cross-section of the cleaning cloth in Example 2 is arc-shaped, and the cleaning cloth is formed by connecting more than two arc-shaped cloth strips. The shape of the arc-shaped cloth strips matches the shape of the arc-shaped glass on the surface of the signal lamp. In this way, the signal lamp can be wiped better during the wiping process, and when winding, follow the Figure 8 Wrap directly on the cleaning stick as shown. In addition, when winding the cleaning cloth on the first cleaning rod and the second cleaning rod, the cloth can be slightly lowered to the bottom of the cleaning rod, so that the arc-shaped cleaning cloth can be more in contact with the arc surface of the signal lamp. Tight for better cleaning results.
Embodiment 3
[0046] Embodiment 3: Different from Embodiment 1, the outer edges of the two rollers have gears, and the inner side of the flange at the back edge of the signal light is surrounded by a rack meshed with the gears. In this way, when the two rollers rotate, the rotation of the rotating arm can be better driven to prevent slipping.
Embodiment 4
[0047] Embodiment 4: Different from Embodiment 2, the outer edges of the two rollers have gears, and the inner side of the flange at the back edge of the signal light is surrounded by a rack meshed with the gears. In this way, when the two rollers rotate, the rotation of the rotating arm can be better driven to prevent slipping.
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