A book placement device for chemical knowledge learning
A technology of knowledge learning and books, which is applied in the field of book placement devices for chemical knowledge learning, can solve the problems of operators such as sore neck, low reading efficiency, and easy fatigue, and achieve the effect of convenient viewing
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Embodiment 1
[0040] A book placement device for learning chemical engineering knowledge, such as Figure 1-10 As shown, it includes a bottom plate 1 , a placing device 2 and a fixing device 3 , the bottom plate 1 is provided with a placing device 2 in the middle of the top, and the placing part of the placing device 2 is provided with a fixing device 3 .
Embodiment 2
[0042] A book placement device for learning chemical engineering knowledge, such as Figure 1-10 As shown, it includes a bottom plate 1 , a placing device 2 and a fixing device 3 , the bottom plate 1 is provided with a placing device 2 in the middle of the top, and the placing part of the placing device 2 is provided with a fixing device 3 .
[0043] The placement device 2 includes a pole 21 and a placement plate 22. The pole 21 is installed in the middle of the top of the bottom plate 1 through a bolt connection. The top of the pole 21 is provided with a placement plate 22. The tops of the rods 21 are connected, and the top of the placement plate 22 is provided with a placement groove 23 .
Embodiment 3
[0045] A book placement device for learning chemical engineering knowledge, such as Figure 1-10 As shown, it includes a bottom plate 1 , a placing device 2 and a fixing device 3 , the bottom plate 1 is provided with a placing device 2 in the middle of the top, and the placing part of the placing device 2 is provided with a fixing device 3 .
[0046] The placement device 2 includes a pole 21 and a placement plate 22. The pole 21 is installed in the middle of the top of the bottom plate 1 through a bolt connection. The top of the pole 21 is provided with a placement plate 22. The tops of the rods 21 are connected, and the top of the placement plate 22 is provided with a placement groove 23 .
[0047] The fixing device 3 includes a rear side plate 31, a cross bar 33, a pressing plate 34, a fixed block 35 and a first spring 36, and the rear side of the top of the placement plate 22 is installed with a rear side plate 31 by means of a bolt connection, and the rear side plate 31 is...
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