A projection screen

Abstract

The utility model discloses a projection screen, belonging to the technical field of projection screens, comprising a base, an upper surface of the base is fixedly connected to a support column, a first transmission mechanism is provided inside the support column, a side of the first transmission mechanism is fixedly connected to a mounting plate, a surface of the mounting plate is fixedly connected to the projection screen, a side of the mounting plate is fixedly connected to a second transmission mechanism, the second transmission mechanism comprises a first shell, a side of the first shell is fixedly connected to a side of the mounting plate, and a beneficial effect is that, with the projection screen, by setting a second transmission mechanism, when it is necessary to protect the projection screen, it is necessary to control the dual-axis motor through a control switch to drive the second threaded column, so that the position of the first connecting rod can be adjusted, so as to drive the folding curtain to unfold, thereby protecting the projection screen and preventing dust from contaminating the projection screen when the device is not in use.

Description

Technical Field

[0001] The utility model relates to the technical field of projection screens, and more specifically, to a projection screen. Background Art

[0002] Multimedia teaching refers to the process of teaching, according to the teaching objectives and the characteristics of the teaching objects, through teaching design, the rational selection and use of modern teaching media, and the organic combination with traditional teaching methods, which jointly participate in the whole teaching process, act on students with a variety of media information, form a reasonable teaching process structure, and achieve the most optimized teaching effect. The projection screen is a commonly used teaching equipment in multimedia teaching. During teaching, in order to improve the teaching effect, teachers generally write to deepen students' impression of knowledge points.

[0003] The existing device cannot protect the projection screen when it is not in use, and the writing area of ​​the existing device cannot be expanded, which is inconvenient for the staff to work. In order to solve the above problems, we have launched the following device. Utility Model Content

[0004] (1) Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a projection screen, which has the characteristics of being easy to protect the projection screen and easy to expand the writing board.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides a projection screen, including a base, a support column is fixedly connected to the upper surface of the base, a first transmission mechanism is opened inside the support column, a mounting plate is fixedly connected to the side of the first transmission mechanism, a projection screen is fixedly connected to the surface of the mounting plate, a second transmission mechanism is fixedly connected to the side of the mounting plate, the second transmission mechanism includes a first shell, the side of the first shell is fixedly connected to the side of the mounting plate, a dual-axis motor is fixedly connected to the inside of the first shell, a second threaded column is fixedly connected to the output end of the dual-axis motor, the other end of the second threaded column is fixedly connected to the second rotating shaft, a second bearing is fixedly connected to the inner wall of the first shell, and the other end of the second rotating shaft is inserted into the second In the bearing, a second threaded nut is threadedly connected to the surface of the second threaded column, a second connecting block is fixedly connected to the side of the second threaded nut, a third sliding groove is opened on the side of the first shell, the second connecting block is inserted in the third sliding groove, a first connecting rod is fixedly connected to the side of the second connecting block, a folding curtain is fixedly connected to the side of the first connecting rod, the other end of the folding curtain is fixedly connected to the second connecting rod, the side of the second connecting rod is fixedly connected to the side of the mounting plate, a sliding rod is fixedly connected inside the mounting plate, a sliding sleeve is slidably connected to the surface of the sliding rod, a third connecting block is fixedly connected to the side of the sliding sleeve, a side of the third connecting block is fixedly connected to the side of the first connecting rod, and a writing board is connected to the side of the mounting plate through a hinge.

[0008] When a projection screen of the present technical solution is used, a second transmission mechanism is set up. When the projection screen needs to be protected, the dual-axis motor needs to be controlled by a control switch to drive the second threaded column, so that the position of the first connecting rod can be adjusted, and the folding curtain can be driven to unfold, thereby protecting the projection screen and preventing dust from contaminating the projection screen when the device is not in use.

[0009] Further, the first transmission mechanism includes a transmission warehouse, which is opened inside the support column, and the inner wall of the transmission warehouse is fixedly connected to a forward and reverse motor, the output end of the forward and reverse motor is fixedly connected to a first threaded column, the other end of the first threaded column is fixedly connected to a first rotating shaft, the inner wall of the transmission warehouse is fixedly connected to a first bearing, the first rotating shaft is passed through the first bearing, the threaded column on the surface of the first threaded column is connected to a first threaded nut, and the side of the first threaded nut is fixedly connected to a first connecting block, the surface of the support column is opened with a first sliding groove, the surface of the first connecting block is slidably connected to the first sliding groove, the side of the first connecting block is fixedly connected to the side of the mounting plate, the surface of the support column is opened with a second sliding groove, the side of the mounting plate is fixedly connected with a slider, the surface of the slider is slidably connected to the second sliding groove, the second sliding groove and the slider are two each, and are symmetrically distributed on the side of the support column.

[0010] Furthermore, a snap-on switch is fixedly connected to the upper end of the mounting plate, and a snap-on plug-in block is fixedly connected to the upper end of the writing board. The snap-on switch and the snap-on plug-in block match each other. There are two writing boards in total and they are symmetrically distributed on the side of the mounting plate.

[0011] Furthermore, a first fixing plate is fixedly connected to the lower end of the writing board, bolts are passed through the surface of the first fixing plate, and a second fixing plate is fixedly connected to the lower end of the mounting plate. The position of the first fixing plate corresponds to the position of the second fixing plate, and the second fixing plate is provided with a threaded hole, and the bolts are passed through the threaded hole.

[0012] Furthermore, an energy storage compartment is provided inside the base, a battery is fixedly connected inside the energy storage compartment, and a control switch is fixedly connected to the lower surface of the mounting plate.

[0013] Furthermore, a universal wheel is arranged below the base, and a brake pad is fixedly connected to the side of the universal wheel. There are a plurality of universal wheels, which are distributed in a rectangular shape at the lower end of the base.

[0014] (3) Beneficial effects

[0015] In summary, the utility model has the following beneficial effects:

[0016] 1. The projection screen is provided with a second transmission mechanism. When the projection screen needs to be protected, the dual-axis motor needs to be controlled by a control switch to drive the second threaded column, so that the position of the first connecting rod can be adjusted, and the folding curtain can be driven to unfold, thereby protecting the projection screen and preventing dust from contaminating the projection screen when the device is not in use;

[0017] 2. This projection screen is provided with a first transmission mechanism. When the height of the projection screen needs to be adjusted, the forward and reverse motors need to be controlled by a control switch, thereby driving the first threaded column to rotate, so that the position of the mounting plate can be adjusted. When the mounting plate moves to the specified position, it is only necessary to control the forward and reverse motors to stop operating by the control switch, thereby achieving the purpose of adjusting the height of the projection screen and improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the drawings required for describing the specific implementation or the prior art will be briefly introduced below. Obviously, the drawings described below are only one implementation of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the utility model in a side-view stereoscopic cutaway view;

[0021] Figure 3 It is a schematic structural diagram of a cross-section of the first transmission mechanism in the utility model;

[0022] Figure 4 It is a schematic structural diagram of a cross-section of the second transmission mechanism in the utility model;

[0023] Figure 5 It is a schematic structural diagram of a side view and section of the projection screen in the utility model.

[0024] 1. Base; 2. Support column; 3. First transmission mechanism; 301. Transmission bin; 302. Forward and reverse motor; 303. First threaded column; 304. First rotating shaft; 305. First bearing; 306. First threaded cap; 307. Second slide groove; 308. Slider; 4. First connecting block; 5. First slide groove; 6. Mounting plate; 7. Casting screen; 8. Second transmission mechanism; 801. First housing; 802. Dual-axis motor; 803. Second threaded column; 804. Second rotating shaft; 80 5. Second bearing; 806. Second threaded nut; 807. Slide rod; 808. Slide sleeve; 9. Second connecting block; 10. Third slide groove; 11. First connecting rod; 12. Folding curtain; 13. Second connecting rod; 14. Writing board; 15. Snap-on switch; 16. Snap-on plug-in block; 17. First fixing plate; 18. Bolt; 19. Universal wheel; 20. Brake pad; 21. Control switch; 22. Energy storage compartment; 23. Battery; 24. Second fixing plate; 25. Third connecting block. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the utility model easy to understand, the technical scheme in the specific implementation mode of the utility model is clearly and completely described below to further illustrate the utility model. Obviously, the specific implementation mode described is only a part of the implementation mode of the utility model, rather than all styles.

[0026] Example:

[0027] The following is combined with Figure 1-5 The utility model is described in further detail.

[0028] See also Figure 1-5The utility model provides a technical solution: a delivery screen, including a base 1, a support column 2 is fixedly connected to the upper surface of the base 1, a first transmission mechanism 3 is provided inside the support column 2, a mounting plate 6 is fixedly connected to the side of the first transmission mechanism 3, a delivery screen 7 is fixedly connected to the surface of the mounting plate 6, a second transmission mechanism 8 is fixedly connected to the side of the mounting plate 6, the second transmission mechanism 8 includes a first shell 801, a side of the first shell 801 is fixedly connected to the side of the mounting plate 6, a dual-axis motor 802 is fixedly connected inside the first shell 801, a second threaded column 803 is fixedly connected to the output end of the dual-axis motor 802, a second rotating shaft 804 is fixedly connected to the other end of the second threaded column 803, a second bearing 805 is fixedly connected to the inner wall of the first shell 801, and the other end of the second rotating shaft 804 is penetrated by the second bearing 805 In the embodiment, the second threaded column 803 is threadedly connected with the second threaded cap 806 on the surface, and the second threaded cap 806 is fixedly connected with the second connecting block 9 on the side. The first shell 801 is provided with a third slide groove 10 on the side, and the second connecting block 9 is inserted into the third slide groove 10. The second connecting block 9 is fixedly connected with the first connecting rod 11 on the side, and the first connecting rod 11 is fixedly connected with the folding curtain 12 on the side, and the other end of the folding curtain 12 is fixedly connected with the second connecting rod 13. The second connecting rod 13 is fixedly connected to the side of the mounting plate 6 on the side, and the mounting plate 6 is fixedly connected with a sliding rod 807 inside. The sliding rod 807 is slidably connected with a sliding sleeve 808 on the surface, and the sliding sleeve 808 is fixedly connected with the third connecting block 25 on the side, and the third connecting block 25 is fixedly connected to the side of the first connecting rod 11 on the side. The side of the mounting plate 6 is connected with a writing board 14 through a hinge.

[0029] By adopting the above technical solution, the projection screen is provided with a second transmission mechanism 8. When the projection screen 7 needs to be protected, the dual-axis motor 802 needs to be controlled by the control switch 21, thereby driving the second threaded column 803, so that the position of the first connecting rod 11 can be adjusted, and the folding curtain 12 can be driven to unfold, thereby protecting the projection screen 7 and preventing dust from contaminating the projection screen 7 when the device is not in use.

[0030] Specifically, the first transmission mechanism 3 includes a transmission warehouse 301, which is arranged inside the support column 2. The inner wall of the transmission warehouse 301 is fixedly connected to the forward and reverse motor 302. The output end of the forward and reverse motor 302 is fixedly connected to the first threaded column 303. The other end of the first threaded column 303 is fixedly connected to the first rotating shaft 304. The inner wall of the transmission warehouse 301 is fixedly connected to the first bearing 305. The first rotating shaft 304 is penetrated by the first bearing 305. The surface of the first threaded column 303 is connected to the first threaded cap 306. The side of the first threaded cap 306 is fixedly connected to the first connecting block 4. The surface of the support column 2 is provided with a first sliding groove 5. The surface of the first connecting block 4 is slidably connected to the first sliding groove 5. The side of the first connecting block 4 is fixedly connected to the side of the mounting plate 6. The surface of the support column 2 is provided with a second sliding groove 307. The side of the mounting plate 6 is fixedly connected to a slider 308. The surface of the slider 308 is slidably connected to the second sliding groove 307. There are two second sliding grooves 307 and two sliders 308, and they are symmetrically distributed on the side of the support column 2.

[0031] By adopting the above technical solution, the projection screen is provided with a first transmission mechanism 3. When the height of the projection screen 7 needs to be adjusted, the forward and reverse motor 302 needs to be controlled by the control switch 21, thereby driving the first threaded column 303 to rotate, so that the position of the mounting plate 6 can be adjusted. When the mounting plate 6 moves to the specified position, it is only necessary to control the forward and reverse motor 302 to stop operating by the control switch 21, thereby achieving the purpose of adjusting the height of the projection screen 7 and improving the practicality of the device.

[0032] Specifically, a snap-on switch 15 is fixedly connected to the upper end of the mounting plate 6, and a snap-on plug-in block 16 is fixedly connected to the upper end of the writing board 14. The snap-on switch 15 matches the snap-on plug-in block 16. There are two writing boards 14 in total, and they are symmetrically distributed on the side of the mounting plate 6.

[0033] Specifically, the lower end of the writing board 14 is fixedly connected to a first fixing plate 17, and a bolt 18 is passed through the surface of the first fixing plate 17. The lower end of the mounting plate 6 is fixedly connected to a second fixing plate 24. The position of the first fixing plate 17 corresponds to the position of the second fixing plate 24. The second fixing plate 24 is provided with a threaded hole, and the bolt 18 is passed through the threaded hole.

[0034] Specifically, an energy storage compartment 22 is provided inside the base 1 , a battery 23 is fixedly connected inside the energy storage compartment 22 , and a control switch 21 is fixedly connected to the lower surface of the mounting plate 6 .

[0035] Specifically, a universal wheel 19 is provided below the base 1 , and a brake pad 20 is fixedly connected to the side of the universal wheel 19 . There are a plurality of universal wheels 19 , which are distributed in a rectangular shape at the lower end of the base 1 .

[0036] The working principle of the utility model is as follows: when the device is used and needs to be pushed, the device can be moved with the cooperation of the universal wheel 19, so that the device can be moved to a position suitable for the use of the device. When the device needs to be fixed, the brake pad 20 arranged on the side of the universal wheel 19 can be adjusted to the brake position, thereby ensuring that the device can maintain a stable working state when it is working normally. When the height of the device needs to be adjusted, the forward and reverse motor 302 needs to be controlled by the control switch 21 to operate, thereby driving the first threaded column 303 to rotate, and with the cooperation of the first threaded column 303 and the first threaded cap 306, the mounting plate 6 is driven to move. When the mounting plate 6 moves to the specified position, it is only necessary to control the forward and reverse motor 302 to stop operating through the control switch 21. At the same time, with the cooperation of the second slide groove 307 and the slider 308, the mounting plate 6 can be moved in a directional manner to avoid jamming of the mounting plate 6 when it is moving. When the projection screen 7 needs to be maintained When protecting, it is necessary to control the operation of the dual-axis motor 802 through the control switch 21, so as to drive the second threaded column 803 to rotate. Under the cooperation of the second threaded column 803 and the second threaded cap 806, the first connecting rod 11 is moved, thereby driving the folding curtain 12 to unfold. When the first connecting rod 11 moves to the specified position, it is only necessary to control the dual-axis motor 802 to stop operating through the control switch 21. When the writing board 14 needs to be expanded, it is necessary to rotate the writing board 14, which can be rotated with the cooperation of the hinge, and then the bolt 18 is rotated so that the bolt 18 and the threaded hole are connected, so as to limit the writing board 14 to prevent the writing board 14 from rotating during normal operation. When the writing board 14 needs to be stored, the bolt 18 needs to be rotated so that the bolt 18 and the threaded hole are disengaged, and then the writing board 14 is rotated. Under the cooperation of the hinge, the snap-on switch 15 and the snap-on plug-in block 16 are connected, so as to limit the writing board 14 to prevent the writing board 14 from rotating when the device is moved.

[0037] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A projection screen, comprising a base (1), characterized in that: The upper surface of the base (1) is fixedly connected to a support column (2), a first transmission mechanism (3) is provided inside the support column (2), a side of the first transmission mechanism (3) is fixedly connected to a mounting plate (6), a surface of the mounting plate (6) is fixedly connected to a projection screen (7), a side of the mounting plate (6) is fixedly connected to a second transmission mechanism (8), the second transmission mechanism (8) comprises a first shell (801), a side of the first shell (801) is fixedly connected to a side of the mounting plate (6), a double-axis motor (802) is fixedly connected inside the first shell (801), an output end of the double-axis motor (802) is fixedly connected to a second threaded column (803), the other end of the second threaded column (803) is fixedly connected to a second rotating shaft (804), a second bearing (805) is fixedly connected to the inner wall of the first shell (801), the other end of the second rotating shaft (804) is inserted into the second bearing (805), and a threaded portion on the surface of the second threaded column (803) is fixedly connected to the second rotating shaft (804). The first shell (801) is provided with a second threaded cap (806), the second threaded cap (806) is fixedly connected to a second connecting block (9) on its side, the first shell (801) is provided with a third sliding groove (10), the second connecting block (9) is inserted into the third sliding groove (10), the second connecting block (9) is fixedly connected to a first connecting rod (11) on its side, the first connecting rod (11) is fixedly connected to a folding curtain (12) on its side, the other end of the folding curtain (12) is fixedly connected to a second connecting rod (13), the second connecting rod (13) is fixedly connected to a side of a mounting plate (6), a sliding rod (807) is fixedly connected inside the mounting plate (6), a sliding sleeve (808) is slidably connected to the surface of the sliding rod (807), the sliding sleeve (808) is fixedly connected to a third connecting block (25) on its side, the third connecting block (25) is fixedly connected to a side of the first connecting rod (11), and the side of the mounting plate (6) is connected to a writing board (14) via a hinge.

2. A projection screen according to claim 1, characterized in that: The first transmission mechanism (3) comprises a transmission chamber (301), the transmission chamber (301) is arranged inside the support column (2), the inner wall of the transmission chamber (301) is fixedly connected with a forward and reverse motor (302), the output end of the forward and reverse motor (302) is fixedly connected with a first threaded column (303), the other end of the first threaded column (303) is fixedly connected with a first rotating shaft (304), the inner wall of the transmission chamber (301) is fixedly connected with a first bearing (305), the first rotating shaft (304) is inserted into the first bearing (305), and the threaded column on the surface of the first threaded column (303) is connected with a first threaded cap (306). The first threaded cap (306) is fixedly connected to a first connecting block (4) on its side, a first sliding groove (5) is provided on the surface of the support column (2), the surface of the first connecting block (4) is slidably connected in the first sliding groove (5), the side of the first connecting block (4) is fixedly connected to a side of a mounting plate (6), a second sliding groove (307) is provided on the surface of the support column (2), a sliding block (308) is fixedly connected to the side of the mounting plate (6), the surface of the sliding block (308) is slidably connected in the second sliding groove (307), the second sliding groove (307) and the sliding block (308) are provided in two each, and are symmetrically distributed on the side of the support column (2).

3. A projection screen according to claim 1, characterized in that: A snap-on switch (15) is fixedly connected to the upper end of the mounting plate (6), and a snap-on plug-in block (16) is fixedly connected to the upper end of the writing board (14). The snap-on switch (15) and the snap-on plug-in block (16) match each other. There are two writing boards (14) in total, and they are symmetrically distributed on the side of the mounting plate (6).

4. A projection screen according to claim 1, characterized in that: The lower end of the writing board (14) is fixedly connected to a first fixing plate (17), a surface of the first fixing plate (17) is provided with bolts (18), the lower end of the mounting plate (6) is fixedly connected to a second fixing plate (24), the position of the first fixing plate (17) corresponds to the position of the second fixing plate (24), the second fixing plate (24) is provided with a threaded hole, and the bolts (18) are provided in the threaded hole.

5. The projection screen according to claim 1, characterized in that: An energy storage compartment (22) is provided inside the base (1), a storage battery (23) is fixedly connected inside the energy storage compartment (22), and a control switch (21) is fixedly connected to the lower surface of the mounting plate (6).

6. A projection screen according to claim 1, characterized in that: A universal wheel (19) is arranged below the base (1), and a brake pad (20) is fixedly connected to the side of the universal wheel (19). There are a plurality of universal wheels (19) distributed in a rectangular shape at the lower end of the base (1).

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