Storable projection cloth for outdoor teaching

Abstract

The utility model relates to the technical field of projection equipment, in particular to a storable projection cloth for outdoor teaching, which comprises a winding rod, support rods and a projection cloth, the two ends of the winding rod are respectively and rotatably provided with one support rod, the support rods are overturned to be vertical to the winding rod in a use state, and the support rods are rotated to be attached to the winding rod, so that the projection cloth can be stored. The projection cloth can be wound and stored on the winding rod and the supporting rod, the other end of the projection cloth is provided with a tightening rod, the two ends of the tightening rod are connected with the insertion modules, and the tops of the two ends of the winding rod are provided with first threaded holes used for fixing the insertion modules in the stored state of the projection cloth. The beneficial effects of the utility model are that the device can not only fix the projection cloth when the projection cloth is unfolded, but also prevent the projection cloth from loosening after the projection cloth is wound through arranging the plugging modules at the two ends of the tightening rod, and the operation is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of projection equipment, in particular to a retractable projection screen for outdoor teaching. Background Art

[0002] As an important teaching aid, the projection screen is widely used in various teaching scenarios. Currently, for the outdoor teaching projection screen on the market, its U-shaped frame is composed of multiple components, which are connected by fasteners such as bolts and nuts, and then the end corners or edges of the projection screen are fixed on the U-shaped frame. Although this design realizes the detachable and retractable frame to a certain extent, in the actual use process, the installation and disassembly of this retractable projection screen structure are inconvenient, and the structure is redundant and complex; after the projection screen is used, tools such as ropes are used to tie it to prevent the projection screen from loosening, the operation is cumbersome, the use efficiency is reduced, and it is inconvenient to unfold, store and carry. Summary of the Invention

[0003] The purpose of the utility model is to provide a retractable projection screen for outdoor teaching, and solve the technical problem that the existing projection screen is inconvenient to unfold, store and carry.

[0004] To solve the above technical problems, the utility model provides the following technical solution: A retractable projection screen for outdoor teaching, which includes a winding rod, a support rod and a projection screen. One support rod is rotatably arranged at each end of the winding rod. The support rod is flipped to be perpendicular to the winding rod in the use state. When the support rod rotates to be in contact with the winding rod, the projection screen can be wound and stored on the winding rod and the support rod. A tightening rod is arranged at the other end of the projection screen. Plug-in modules are connected to both ends of the tightening rod. First threaded holes are opened at the tops of both ends of the winding rod for fixing the plug-in modules in the state where the projection screen is stored. In the utility model, by arranging the plug-in modules at both ends of the tightening rod, not only can the projection screen be fixed when it is unfolded, making the device convenient to install and use, but also the projection screen can be prevented from loosening after being wound, which is convenient for storage and carrying.

[0005] As a preferred scheme of a retractable projection screen for outdoor teaching of the utility model, wherein: a card slot for fixing one end of the projection screen is opened at the top end of the winding rod, and a fixing belt embedded in the card slot on the winding rod is arranged at the top end of the projection screen.

[0006] As a preferred scheme of a retractable projection screen for outdoor teaching of the utility model, wherein: a hinge seat is arranged at each end of the winding rod, and the support rod is hinged to the hinge seat. In the utility model, the device is provided with a hinge seat, so that the support and storage of the support rod are more stable.

[0007] As a preferred embodiment of the retractable projection screen for outdoor teaching of the present utility model, the following is provided: A second threaded hole for fixing the plug-in module in the use state is provided at the lower part of the support rod. By providing the second threaded hole on the support rod of the present utility model, the projection screen can be unfolded and fixed through the plug-in module after being unfolded, making the projection screen more flat when unfolded.

[0008] As a preferred embodiment of the retractable projection screen for outdoor teaching of the present utility model, the following is provided: A receiving groove for receiving the support rod is provided at the bottom end of the winding rod. By receiving the support rod into the receiving groove in the present utility model, the volume of the device after being received can be reduced, making it more convenient to carry.

[0009] As a preferred embodiment of the retractable projection screen for outdoor teaching of the present utility model, the following is provided: Cloth belts are connected between both ends of the tightening rod and the plug-in module. By providing the cloth belts in the present utility model, the plug-in module can be made more flexible during use.

[0010] As a preferred embodiment of the retractable projection screen for outdoor teaching of the present utility model, the following is provided: The plug-in module includes a plug head, a limit pin piece and a limit lock catch. One end of the cloth belt is connected to the plug head. A through hole for inserting the plug head is provided on the limit lock catch. An activity groove for installing and allowing the limit pin piece to rotate is provided on the plug head. When the limit pin piece rotates into the activity groove, the plug head can move in the through hole. When the limit pin piece rotates to a state where one end of it abuts against the limit lock catch, the plug head is prevented from moving in the through hole. A screw rod is provided at the bottom end of the limit lock catch. In the present utility model, the plug head is inserted into the limit lock catch, and the limit pin piece rotates out of the activity groove to block the limit lock catch, realizing the fixation of the end of the projection screen, and the operation is simple.

[0011] As a preferred embodiment of the retractable projection screen for outdoor teaching of the present utility model, the following is provided: The plug-in module further includes a spring for resetting the limit pin piece. Both ends of the spring are respectively connected to the inner wall of the activity groove and the limit pin piece. The spring contracts as the limit pin piece is pressed. When the force pressing the limit pin piece disappears, the spring elongates to push the limit pin piece out of the activity groove to abut against the limit lock catch. By resetting the limit pin piece through the spring in the present utility model, the device can be quickly installed and disassembled by plugging and unplugging, and is convenient to use.

[0012] As a preferred embodiment of the retractable projection screen for outdoor teaching of the present utility model, the following is provided: The height of one end of the through hole close to the cloth belt is greater than that of the other end, and the shape of the plug head matches that of the through hole. By setting the shape of the through hole such that the aperture of one end is greater than that of the other end in the present utility model, the plug head is prevented from completely passing through the through hole.

[0013] As an optimal solution for the utility model of a storable projection cloth for outdoor teaching, a limit block is arranged in the movable groove to resist the limit pin, the pin head is inserted into the through hole, one end of the limit pin is pushed out by the spring to resist the limit locking buckle, and the other end of the limit pin is attached to the limit block.

[0014] The utility model has the beneficial effects of a storable projection cloth for outdoor teaching: in the utility model, a plug-in module is arranged at the end corner position of the bottom end of the projection cloth, and threaded holes for installing the limit locking buckle are arranged on the projection cloth winding rod and the support rod; when the projection cloth is in the winding state, the limit locking buckle is installed on the projection cloth winding rod for plugging with the pin head at the end of the projection cloth to prevent the projection cloth from loosening after winding; when the projection cloth is in the unfolded working state, the limit locking buckle is installed on the support rod for plugging with the pin head at the end of the projection cloth; the installation between the limit locking buckle and the pin head is very convenient, and the limit locking buckle can be self-locked by pushing out the limit pin piece through the spring to clamp the limit locking buckle; when disassembling, the limit pin piece is pressed to offset the elastic force of the spring, and the limit pin piece is retracted into the movable groove to pull out the limit locking buckle; the projection cloth has a simple structure, and installation and storage are time-saving and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is an overall schematic diagram of the storage state of the device in the present invention.

[0017] Figure 2 It is an overall schematic diagram of the device in the unfolded state in the utility model.

[0018] Figure 3 It is a partially enlarged schematic diagram of the plug-in module in the utility model. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Second, the "one embodiment" or "embodiment" referred to herein means a specific feature, structure or characteristic that may be included in at least one implementation manner of the present utility model. The "in one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it an individual or alternative embodiment that is mutually exclusive with other embodiments.

[0022] Referring to Figures 1 - 3 , this embodiment provides a retractable projection screen for outdoor teaching. The device can quickly fix the position of the projection screen 3 through the insertion and extraction action of the insertion module 5, with a simple structure and very convenient use.

[0023] A retractable projection screen for outdoor teaching includes a winding rod 1, a support rod 2 and a projection screen 3. The winding rod 1 is in a cylindrical rod shape. A card slot 11 for connecting the top end of the projection screen 3 is opened at the top end of the winding rod 1. A fixing belt is fixedly connected to the top end of the projection screen 3, and the fixing belt at the top end of the projection screen 3 is embedded in the card slot 11 on the winding rod 1. The fixing belt plays a role in positioning and guiding, making the projection screen 3 more stable and flat. Hinge seats 21 for connecting the support rod 2 are arranged at both ends of the winding rod 1. The support rod 2 supports the winding rod 1 to form a door-shaped structure. The bottom end of the projection screen 3 is connected to a tightening rod 31, so that the bottom end of the projection screen 3 will not wrinkle when unfolded, and the whole is more flat. Both ends of the tightening rod 31 are connected to the insertion module 5. First threaded holes 12 for fixing the insertion module 5 are opened at the top of both ends of the winding rod 1. After the projection screen 3 is wound around the winding rod 1 through the tightening rod 31, the insertion module 5 is fixed in the first threaded holes 12, so that the projection screen 3 will not loosen after winding, and the operation is simple.

[0024] Furthermore, there are a pair of support rods 2. Second threaded holes 22 for fixing the insertion module 5 are arranged at the lower part of the support rods 2. When the projection screen 3 is unfolded for use, the insertion module 5 is fixed in the second threaded holes 22, making the projection screen 3 more stable and flat.

[0025] Furthermore, a receiving groove 13 for receiving the support rod 2 is arranged at the bottom end of the winding rod 1. The support rod 2 can rotate around the hinge seat 21 to realize the storage of the support rod 2 into the receiving groove 13 of the winding rod 1, making the device smaller in volume and more convenient to carry.

[0026] Furthermore, cloth belts 32 are connected between both ends of the tightening rod 31 and the insertion module 5, making the insertion module 5 more flexible in use.

[0027] Specifically, the plug-in module 5 includes a plug head 51, a limit pin piece 52, and a limit locking buckle 53. One end of the cloth belt 32 is connected to the plug head 51. A through hole 41 for inserting the plug head 51 is provided on the limit locking buckle 53. An activity slot 55 for installing and rotating the limit pin piece 52 is provided on the plug head 51. When the limit pin piece 52 is turned into the activity slot 55, the plug head 51 can move in the through hole 41. When the limit pin piece 52 rotates to a state where one end of it abuts against the limit locking buckle 53, the movement of the plug head 51 in the through hole 41 is blocked. A screw rod 42 is provided at the bottom end of the limit locking buckle 53. When the projection cloth 3 is in a wound state, the limit locking buckle 53 is embedded in the first threaded hole 12. The plug head 51 is inserted into the limit locking buckle 53 and fixed by the limit pin piece 52 clamping the limit locking buckle 53 to prevent the projection cloth 3 from loosening after being wound. When the projection cloth 3 is in an unfolded state, the limit locking buckle 53 is embedded in the second threaded hole 22, and the plug head 51 is inserted into the limit locking buckle 53 again for fixation, which is very convenient to operate.

[0028] Furthermore, the plug-in module 5 further includes a spring 54 for resetting the limit pin piece 52. Both ends of the spring 54 are respectively connected to the inner wall of the activity slot 55 and the limit pin piece 52. The spring 54 contracts as the limit pin piece 52 is pressed. When the force pressing the limit pin piece 52 disappears, the spring 54 elongates to push the limit pin piece 52 out of the activity slot 55 to abut against the limit locking buckle 53, thereby realizing the locking function.

[0029] Furthermore, the height of one end of the through hole 41 close to the cloth belt 32 is greater than that of the other end. The shape of the plug head 51 is matched with the through hole 41. With this setting, the plug head 51 will not completely pass through the through hole 41.

[0030] Preferably, a limit block 551 is provided in the activity slot 55 to resist the limit pin piece 52. The plug head 51 is inserted into the through hole 41. One end of the limit pin piece 52 is pushed out by the spring 54 to abut against the limit locking buckle 53, and the other end of the limit pin piece 52 abuts against the limit block 551.

[0031] Parts not specifically described in the above instructions are all prior art or can be realized through prior art. Moreover, the specific implementation cases described in the present invention are only the preferred implementation cases of the present invention, and are not used to limit the implementation scope of the present invention. That is, equivalent changes and modifications made according to the content of the scope of the present invention patent should all be regarded as the technical scope of the present invention.

Claims

1. A retractable projection cloth for outdoor teaching, characterized in that: The projection cloth (3) comprises a winding rod (1), a support rod (2) and a projection cloth (3), wherein a support rod (2) is rotatably arranged at each end of the winding rod (1), and the support rod (2) is flipped to be perpendicular to the winding rod (1) in a use state, and the support rod (2) is rotated to be in a state of being in contact with the winding rod (1), so that the projection cloth (3) can be wound and stored on the winding rod (1) and the support rod (2), and a tightening rod (31) is arranged at the other end of the projection cloth (3), and the two ends of the tightening rod (31) are connected to the plug-in module (5), and the top of the two ends of the winding rod (1) are provided with a first threaded hole (12) for fixing the plug-in module (5) in the state of storing the projection cloth.

2. The storable projection screen for outdoor teaching according to claim 1, characterized in that: A slot (11) for fixing one end of the projection cloth (3) is provided at the top end of the winding rod (1), and a fixing belt is provided at the top end of the projection cloth (3) and is embedded in the slot (11) on the winding rod (1).

3. The foldable projection cloth for outdoor teaching according to claim 1, characterized in that: A hinge seat (21) is respectively provided at both ends of the winding rod (1), and the support rod (2) is hinged to the hinge seat (21).

4. The foldable projection cloth for outdoor teaching according to claim 1, characterized in that: The lower part of the support rod (2) is provided with a second threaded hole (22) for fixing the plug-in module (5) in a use state.

5. The foldable projection cloth for outdoor teaching according to claim 1, characterized in that: The bottom end of the winding rod (1) is provided with a receiving groove (13) for receiving the support rod (2).

6. The foldable projection cloth for outdoor teaching according to claim 1, characterized in that: Cloth belts (32) are connected between the two ends of the tightening rod (31) and the plug-in module (5).

7. The foldable projection cloth for outdoor teaching according to claim 6, characterized in that: The plug-in module (5) comprises a plug head (51), a limit pin (52) and a limit locking buckle (53); one end of the cloth belt (32) is connected to the plug head (51); a through hole (41) for the plug head (51) to be inserted is provided on the limit locking buckle (53); a movable groove (55) is provided on the plug head (51) for installing and rotating the limit pin (52); when the limit pin (52) is rotated into the movable groove (55), the plug head (51) can move in the through hole (41); when the limit pin (52) is rotated to a state where one end of the limit pin (52) abuts against the limit locking buckle (53), the plug head (51) is prevented from moving in the through hole (41); a screw rod (42) is provided at the bottom end of the limit locking buckle (53).

8. The foldable projection cloth for outdoor teaching according to claim 7, characterized in that: The plug-in module (5) further comprises a spring (54) for resetting the limit pin (52), the two ends of the spring (54) being respectively connected to the inner wall of the movable groove (55) and the limit pin (52), the spring (54) being contracted as the limit pin (52) is pressed, the force pressing the limit pin (52) disappears, and the spring (54) is extended to push the limit pin (52) out of the movable groove (55) to press against the limit locking buckle (53).

9. The foldable projection cloth for outdoor teaching according to claim 7, characterized in that: The height of one end of the through hole (41) close to the cloth belt (32) is greater than the height of the other end, and the shape of the latch head (51) matches the through hole (41).

10. The foldable projection screen for outdoor teaching according to claim 8, characterized in that A limit block (551) is arranged in the movable groove (55) to resist the limit pin (52), the pin head (51) is inserted into the through hole (41), the spring (54) pushes out one end of the limit pin (52) to resist the limit locking buckle (53), and the other end of the limit pin (52) is attached to the limit block (551).

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