Propaganda device for film propagation

Abstract

The invention discloses a propaganda device for film propagation, and belongs to the technical field of projection propaganda equipment, and the technical key points are that the propaganda device comprises a clamping unit slidably connected in a base; the adjusting unit is rotationally connected in the base and connected with the clamping unit; and the storage unit is mounted in the base and connected with the adjusting unit. When the projection cloth is used for film propaganda and playing, the height of the projection cloth can be adjusted through the lifting unit. And the adjusting unit is rotated, the adjusting unit can drive the clamping unit to install and fix the lifting unit, and the installation stability of the lifting unit is improved. When the lifting unit needs to be disassembled, the adjusting unit is rotated reversely, the adjusting unit can drive the clamping unit to slide into the base, and the adjusting unit can drive the clamping unit to slide inwards in the base under the action of the storage unit, so that the clamping unit can be stored, and the protection performance of the clamping unit is improved; and the device is convenient to transport.

Description

Technical Field

[0001] The present invention relates to the technical field of projection publicity equipment, and in particular to a publicity device for film dissemination. Background Art

[0002] As a powerful cultural form, movies can have a profound impact on our lives, values, attitudes, etc. Every movie is a story full of emotion, thought and enlightenment, which can broaden our horizons and change our worldview and way of cognition.

[0003] Most movie broadcasts require the use of projectors in various venues. When the projector is in use, the projection cloth needs to be supported and fixed.

[0004] However, the supporting devices in the prior art are all fixed structures, so they are not convenient for transportation. Moreover, since the supporting devices are fixed and exposed to the outside, they are easily damaged during transportation. The protective performance of the supporting devices is not strong. Therefore, it is necessary to provide a promotional device for film dissemination to solve the above problems. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the embodiment of the present invention aims to provide a promotional device for film dissemination to solve the problems in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A promotional device for film dissemination, comprising:

[0008] A base, wherein a projection cloth is connected to the base via a lifting unit;

[0009] A clamping unit is slidably connected to the base and is used to clamp and fix the lifting unit;

[0010] The adjusting unit is rotatably connected to the base and connected to the clamping unit, and is used to drive the clamping unit to slide in the base;

[0011] A storage unit is installed in the base and connected to the adjustment unit, and the adjustment unit is used to store the clamping unit under the action of the storage unit;

[0012] A supporting unit is installed on the base and is used to support and fix the base;

[0013] The placement unit is installed on the side of the lifting unit and is used to place the tools.

[0014] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: the present invention provides a clamping unit that is slidably connected in the base and is used to clamp and fix the lifting unit; an adjusting unit that is rotatably connected in the base and connected to the clamping unit is used to drive the clamping unit to slide in the base; a storage unit that is installed in the base and is connected to the adjusting unit, and the adjusting unit is used to store the clamping unit under the action of the storage unit.

[0015] When using a projection screen for movie promotions, the height of the screen can be adjusted using the lifting unit. By rotating the adjustment unit, it drives the clamping unit to secure the lifting unit, improving the installation stability of the lifting unit. When the lifting unit needs to be disassembled for transportation, the adjustment unit is rotated in the opposite direction, driving the clamping unit to slide into the base. The adjustment unit, coupled with the storage unit, drives the clamping unit to slide inward within the base, allowing the clamping unit to be stored. This improves the protective performance of the clamping unit and facilitates transportation of the device.

[0016] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a promotional device for film dissemination provided by an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the structure of the clamping unit provided in an embodiment of the present invention.

[0019] Figure 3 Schematic diagram of the structure of the lifting unit provided in an embodiment of the present invention.

[0020] Figure 4 This is a schematic structural diagram of a placement unit provided in an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of the structure of the second V-shaped frame provided in an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of the structure of the clamping frame provided in an embodiment of the present invention.

[0023] Figure markings: 1-base, 11-projection cloth, 12-moving wheel, 2-clamping unit, 21-slide rod, 22-sliding member, 23-clamping frame, 3-adjusting unit, 31-adjusting rod, 32-sliding block, 33-bevel groove, 34-sliding column, 4-storage unit, 41-vertical groove, 42-horizontal groove, 5-supporting unit, 51-slide cylinder, 52-sliding frame, 53-first rotating shaft, 54-first V-shaped frame, 55-second rotating shaft, 56-second V-shaped frame, 57-limiting frame, 6-lifting unit, 61-inner cylinder, 62-outer cylinder, 63-fixed frame, 64-threaded rod, 65-rotating rod, 66-handle, 67-first gear, 68-second gear, 7-placing unit, 71-groove frame, 72-third gear, 73-first sliding rack, 74-supporting frame, 75-second sliding rack, 76-clamp. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0026] See also Figures 1 to 6 , a promotional device for film dissemination, comprising:

[0027] A base 1, to which a projection cloth 11 is connected via a lifting unit 6;

[0028] The clamping unit 2 is slidably connected to the base 1 and is used to clamp and fix the lifting unit 6;

[0029] The adjusting unit 3 is rotatably connected to the base 1 and connected to the clamping unit 2, and is used to drive the clamping unit 2 to slide in the base 1;

[0030] The storage unit 4 is installed in the base 1 and connected to the adjustment unit 3. The adjustment unit 3 is used to store the clamping unit 2 under the action of the storage unit 4;

[0031] The support unit 5 is installed on the base 1 and is used to support and fix the base 1;

[0032] The placement unit 7 is installed on the side of the lifting unit 6 and is used to place the tools.

[0033] In an embodiment of the present invention, when using projection cloth 11 for movie promotion and broadcasting, the height of projection cloth 11 can be adjusted via lifting unit 6. By rotating adjustment unit 3, it can drive clamping unit 2 to securely mount lifting unit 6, thereby improving the installation stability of lifting unit 6. When lifting unit 6 needs to be disassembled, adjustment unit 3 is rotated in the opposite direction, which drives clamping unit 2 to slide into base 1. Furthermore, storage unit 4 can drive clamping unit 2 to slide inward within base 1, thereby allowing clamping unit 2 to be stored. This improves the protective performance of clamping unit 2 and facilitates transportation of the device.

[0034] In one embodiment of the present invention, Figure 2 and Figure 6 As shown, the clamping unit 2 includes:

[0035] The slide rod 21 is installed in the base 1, and a slide member 22 is slidably provided on the surface of the slide rod 21, and the slide member 22 is slidably connected to the base 1;

[0036] The clamping frame 23 is fixed on the side of the sliding member 22.

[0037] In this embodiment, the slide rod 21 is installed in the base 1 , a slide member 22 is slidably provided on the surface of the slide rod 21 , and the slide member 22 is slidably connected to the base 1 ; the clamping frame 23 is fixed to the side of the slide member 22 .

[0038] When installing the outer cylinder 62, by placing the outer cylinder 62 on the base 1 and rotating the adjusting unit 3, the adjusting unit 3 can drive the sliding member 22 to slide upward in the base 1 through the connection with the sliding member 22, and the sliding member 22 can drive the clamping frame 23 on its side to slide upward synchronously until the clamping frame 23 slides to the surface of the outer cylinder 62, so that the outer cylinder 62 can be limited and fixed under the action of the clamping frame 23, effectively improving the installation stability of the outer cylinder 62.

[0039] A rubber pad may be installed on the inner side of the clamping frame 23 in the clamping unit 2 to protect the outer cylinder 62 .

[0040] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the adjustment unit 3 includes:

[0041] The adjusting rod 31 is rotatably connected to the base 1 and has a reverse thread mounted on its surface;

[0042] The slider 32 is connected to the adjusting rod 31 by threads;

[0043] An inclined groove 33 is provided on the slider 32;

[0044] The sliding post 34 is fixed on the surface of the sliding member 22 and is slidably connected to the inclined groove 33 .

[0045] In this embodiment, the adjusting rod 31 is rotatably connected to the base 1 and has a reverse thread installed on the surface; the slider 32 is connected to the adjusting rod 31 through a thread; the inclined groove 33 is opened on the slider 32; the sliding column 34 is fixed on the surface of the sliding member 22 and is slidably connected to the inclined groove 33.

[0046] The adjusting rod 31 is rotated. Since the adjusting rod 31 and the slider 32 are connected by a thread, the two sets of sliders 32 can slide in opposite directions in the base 1 under the action of the adjusting rod 31. The slider 32 can drive the inclined groove 33 on its surface to slide synchronously when sliding. Since the inclined groove 33 and the sliding column 34 are slidingly connected, the sliding column 34 can drive the sliding member 22 to slide upward in the base 1 under the action of the inclined groove 33, so that the sliding member 22 can drive the clamping frame 23 on its side to slide upward synchronously until the clamping frame 23 slides to the outside of the outer cylinder 62, so that the outer cylinder 62 can be limited and fixed under the action of the clamping frame 23, thereby improving the installation stability of the outer cylinder 62.

[0047] Similarly, when the outer cylinder 62 needs to be disassembled, the adjusting rod 31 is rotated in the opposite direction so that the two sets of sliders 32 slide in the same direction. At this time, the sliding column 34 can drive the sliding member 22 to slide downward in the base 1 under the action of the inclined groove 33, so that the sliding member 22 can drive the clamping frame 23 to slide to the side of the outer cylinder 62, thereby facilitating the disassembly of the outer cylinder 62.

[0048] The inclined groove 33 in the adjustment unit 3 may also be replaced by an arc-shaped groove, which is not limited here.

[0049] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the storage unit 4 includes:

[0050] A vertical slot 41 is provided on the base 1 and is slidably connected to the sliding post 34;

[0051] The transverse groove 42 is formed on the base 1 , communicates with the vertical groove 41 , and is slidably connected to the sliding post 34 .

[0052] In this embodiment, the vertical slot 41 is provided on the base 1 and is slidably connected to the sliding column 34 ; the horizontal slot 42 is provided on the base 1 and is communicated with the vertical slot 41 and is slidably connected to the sliding column 34 .

[0053] When the sliding post 34 drives the sliding member 22 to slide downward in the base 1 under the action of the inclined groove 33, since the sliding post 34 and the vertical groove 41 are also slidably connected, the sliding post 34 can also slide downward in the vertical groove 41 until the sliding post 34 slides to the lower end of the vertical groove 41 (that is, the end of the horizontal groove 42). At this time, the sliding member 22 drives the clamping frame 23 to slide into the interior of the base 1.

[0054] Continuing to rotate the adjustment rod 31, the two sets of sliders 32 continue to slide in the same direction, and the two sets of sliders 32 respectively drive the inclined grooves 33 to slide in the same direction. Therefore, the two sets of sliding posts 34 can slide in the same direction within the transverse groove 42 under the push of the inclined grooves 33. As the sliding posts 34 slide inward within the transverse groove 42, the two sets of sliding posts 34 can drive the slider 22 to slide inward within the slide rod 21 until the two sets of sliders 22 drive the clamping frame 23 to contact each other, thereby storing the clamping frame 23.

[0055] Similarly, by rotating the adjusting rod 31 in the opposite direction, the two sets of sliding members 22 can drive the clamping frames 23 to move away from each other until they slide out of the base 1 .

[0056] The connection between the vertical slot 41 and the horizontal slot 42 in the storage unit 4 is connected by an arc-shaped slot, so that the sliding column 34 can pass through smoothly.

[0057] In one embodiment of the present invention, Figure 2 and Figure 5 As shown, the support unit 5 includes:

[0058] The slide 51 is fixed to the side of the base 1 and is slidably connected to the slide frame 52;

[0059] A first rotating shaft 53 is rotatably connected to the sliding frame 52 and has a first V-shaped frame 54 mounted on its surface;

[0060] The second rotating shaft 55 is rotatably connected to the slide 51, and a second V-shaped frame 56 is mounted on the surface thereof, and the end of the first V-shaped frame 54 is hinged to the middle of the second V-shaped frame 56;

[0061] The limiting frame 57 is fixed to the end of the second V-shaped frame 56 .

[0062] In this embodiment, the slide 51 is fixed to the side of the base 1, and is slidably connected to the sliding frame 52 inside; the first rotating shaft 53 is rotatably connected to the sliding frame 52, and a first V-shaped frame 54 is installed on the surface; the second rotating shaft 55 is rotatably connected to the slide 51, and a second V-shaped frame 56 is installed on the surface, and the end of the first V-shaped frame 54 and the middle of the second V-shaped frame 56 are hinged; the limit frame 57 is fixed to the end of the second V-shaped frame 56.

[0063] The base 1 is provided with a movable wheel 12 mounted on the bottom thereof, which allows the base 1 to be moved. To move the base 1, the end of the first V-shaped frame 54 is pulled upward, causing the first V-shaped frame 54 to drive the first rotating shaft 53 to rotate clockwise on the sliding frame 52. During this rotation, the first V-shaped frame 54, through its connection with the second V-shaped frame 56, drives the second rotating shaft 55 to rotate counterclockwise within the slide 51. Because the connection points of the first rotating shaft 53, the first V-shaped frame 54, the second V-shaped frame 56, and the second rotating shaft 55 are not in the same vertical direction, during this process, the slide 51 first slides upward on the surface of the slide 52 under the action of the first V-shaped frame 54 and the second V-shaped frame 56, and then slides downward on the surface of the slide 52 until the upper portion of the slide 52 completely slides into the slide 51. This allows the movable wheel 12 to contact the ground, thereby allowing the base 1 to be moved by the movable wheel 12.

[0064] The upper end of the sliding frame 52 is connected to the interior of the slide cylinder 51 through an elastic member, so that the upper part of the sliding frame 52 slides completely into the slide cylinder 51. The sliding frame 52 can be limited and fixed under the action of the elastic member to prevent the sliding frame 52 from sliding out of the slide cylinder 51.

[0065] When the base 1 needs to be fixed, just press down the end of the first V-shaped frame 54, so that the first V-shaped frame 54 drives the first rotating shaft 53 to rotate counterclockwise, and the second V-shaped frame 56 drives the second rotating shaft 55 to rotate clockwise. At this time, the slide 51 will also slide upward on the surface of the slide frame 52 first, and then slide downward (the upward sliding distance is greater than the downward sliding distance). Until the second V-shaped frame 56 drives the limit frame 57 at its end to rotate until it contacts the surface of the slide 51 (such as Figure 2 Therefore, the slide 51 can limit and fix the second V-shaped frame 56 through the limiting frame 57, thereby improving the stability of the second V-shaped frame 56 after rotation.

[0066] Because the distance that the slide 51 slides upward on the surface of the sliding frame 52 is greater than the distance that it slides downward, the slide 51 can drive the moving wheel 12 off the ground through the base 1. At this time, the sliding frame 52 can support the slide 51 through the first rotating shaft 53, the first V-shaped frame 54, the second V-shaped frame 56, and the second rotating shaft 55 in sequence. In turn, the slide 51 can support the base 1, thereby improving the stability of the base 1 supporting the device.

[0067] The elastic member in the support unit 5 can be a spring or elastic rubber, so as to facilitate pulling the sliding frame 52 to slide upward in the sliding cylinder 51.

[0068] In one embodiment of the present invention, Figure 3As shown, the lifting unit 6 includes:

[0069] The inner cylinder 61 is slidably connected to the clamping frame 23, and the outer surface thereof is slidably connected to the outer cylinder 62;

[0070] The fixing frame 63 is fixed in the outer cylinder 62 and is slidably connected to the threaded rod 64;

[0071] The rotating rod 65 is rotatably connected to the outer cylinder 62, and has a first gear 67 mounted on its surface and a handle 66 mounted on its end;

[0072] The second gear 68 is mounted on the end of the threaded rod 64 and is meshed with the first gear 67 .

[0073] In this embodiment, the inner cylinder 61 is slidably connected in the clamping frame 23, and the outer surface is slidably connected to the outer cylinder 62; the fixed frame 63 is fixed in the outer cylinder 62, and the internal sliding connection is a threaded rod 64; the rotating rod 65 is rotatably connected in the outer cylinder 62, and a first gear 67 is installed on the surface, and a handle 66 is installed at the end; the second gear 68 is installed at the end of the threaded rod 64 and is meshed with the first gear 67.

[0074] The projection cloth 11 is installed between the two sets of outer cylinders 62. When the height of the projection cloth 11 needs to be adjusted, the handle 66 is turned. The handle 66 can drive the rotating rod 65 to rotate in the outer cylinder 62. When the rotating rod 65 rotates, it can drive the first gear 67 on its surface to rotate. The first gear 67 can drive the threaded rod 64 to rotate in the fixed frame 63 through the second gear 68. When the threaded rod 64 rotates, it can rotate synchronously in the inner cylinder 61. The cross-sections of the inner cylinder 61 and the outer cylinder 62 are both rectangular.

[0075] Therefore, the inner cylinder 61 can slide downward inside the outer cylinder 62 under the action of the threaded rod 64, so the outer cylinder 62 can rise on the surface of the inner cylinder 61, so that the outer cylinder 62 can drive the projection cloth 11 on its side to rise synchronously, and then the height of the projection cloth 11 can be adjusted.

[0076] The handle 66 in the lifting unit 6 can also be replaced by a motor, so that the rotating rod 65 can rotate stably in the outer cylinder 62 under the action of the output end of the motor.

[0077] In one embodiment of the present invention, Figure 4 As shown, the placement unit 7 includes:

[0078] The groove frame 71 is fixed to the side of the outer cylinder 62 and is rotatably connected to the third gear 72;

[0079] The first sliding rack 73 is slidably connected in the groove frame 71 and meshed with the third gear 72, and a support frame 74 is installed at the end thereof;

[0080] The second sliding rack 75 is slidably connected to the side of the groove frame 71 and meshed with the third gear 72. A clamp 76 is installed at the end thereof.

[0081] In this embodiment, the groove frame 71 is fixed to the side of the outer cylinder 62, and is internally rotatably connected to the third gear 72; the first sliding rack 73 is slidably connected in the groove frame 71, meshing with the third gear 72, and a support frame 74 is installed at the end; the second sliding rack 75 is slidably connected to the side of the groove frame 71, meshing with the third gear 72, and a clamp 76 is installed at the end.

[0082] When the device is in use, the tool can be placed on the support frame 74, and the support frame 74 can drive the first sliding rack 73 to slide downward in the groove frame 71 under the action of the gravity of the tool. The first sliding rack 73 can drive the third gear 72 to rotate counterclockwise in the groove frame 71 through the connection with the third gear 72. At the same time, the third gear 72 can drive the second sliding rack 75 to slide in the groove frame 71 through the connection with the second sliding rack 75, so that the second sliding rack 75 can drive the clamp 76 at its end to slide synchronously until the clamp 76 clamps and fixes the side of the tool.

[0083] The second sliding rack 75 and the clamp 76 are respectively installed in two groups, so as to facilitate clamping and fixing the two sides of the tool.

[0084] The working principle of the present invention is: when installing the outer cylinder 62, by placing the outer cylinder 62 on the base 1 and rotating the adjusting rod 31, since the adjusting rod 31 and the slider 32 are connected by a thread, the two groups of sliders 32 can slide in opposite directions in the base 1 under the action of the adjusting rod 31, and the slider 32 can drive the inclined groove 33 on its surface to slide synchronously when sliding. Since the inclined groove 33 and the sliding column 34 are slidingly connected, the sliding column 34 can drive the sliding member 22 to slide upward in the base 1 under the action of the inclined groove 33, so that the sliding member 22 can drive the clamping frame 23 on its side to slide upward synchronously until the clamping frame 23 slides to the outside of the outer cylinder 62, so that the outer cylinder 62 can be limited and fixed under the action of the clamping frame 23, thereby improving the installation stability of the outer cylinder 62.

[0085] Similarly, when the outer cylinder 62 needs to be disassembled, the adjusting rod 31 is rotated in the opposite direction. At this time, the sliding column 34 can drive the sliding member 22 to slide downward in the base 1 under the action of the inclined groove 33. When the sliding column 34 drives the sliding member 22 to slide downward in the base 1 under the action of the inclined groove 33, since the sliding column 34 and the vertical groove 41 are also slidingly connected, the sliding column 34 can also slide downward in the vertical groove 41 until the sliding column 34 slides to the lower end of the vertical groove 41 (that is, the end of the horizontal groove 42). At this time, the sliding member 22 drives the clamping frame 23 to slide to the inside of the base 1.

[0086] Continuing to rotate the adjustment rod 31, the two sets of sliders 32 continue to slide in the same direction, and the two sets of sliders 32 respectively drive the inclined grooves 33 to slide in the same direction. Therefore, the two sets of sliding posts 34 can slide in the same direction within the transverse groove 42 under the push of the inclined grooves 33. As the sliding posts 34 slide inward within the transverse groove 42, the two sets of sliding posts 34 can drive the slider 22 to slide inward within the slide rod 21 until the two sets of sliders 22 drive the clamping frame 23 to contact each other, thereby storing the clamping frame 23.

[0087] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A promotional device for film dissemination, characterized in that: The film promotion device includes: A base, wherein a projection cloth is connected to the base via a lifting unit; A clamping unit is slidably connected to the base and is used to clamp and fix the lifting unit; The adjusting unit is rotatably connected to the base and connected to the clamping unit, and is used to drive the clamping unit to slide in the base; A storage unit is installed in the base and connected to the adjustment unit, and the adjustment unit is used to store the clamping unit under the action of the storage unit; A supporting unit is installed on the base and is used to support and fix the base; The placement unit is installed on the side of the lifting unit and is used to place the tools.

2. The film promotion device according to claim 1, wherein: The clamping unit comprises: The sliding rod is installed in the base, and a sliding member is slidably provided on the surface of the sliding rod, and the sliding member is slidably connected to the base; Clamping bracket, fixed to the side of the slide.

3. The film promotion device according to claim 2, wherein: The adjustment unit includes: The adjusting rod is rotatably connected to the base and has a reverse thread on the surface; A slider is connected to the adjusting rod through threads; An inclined groove is provided on the slider; The sliding column is fixed on the surface of the sliding member and is slidably connected to the inclined groove.

4. The film promotion device according to claim 3, wherein: The storage unit comprises: A vertical slot is provided on the base and is slidably connected to the sliding column; The horizontal groove is provided on the base, is communicated with the vertical groove, and is slidably connected with the sliding column.

5. The film promotion device according to claim 1, wherein: The support unit comprises: The slide is fixed to the side of the base and is slidably connected to the slide frame inside; A first rotating shaft is rotatably connected to the sliding frame, and a first V-shaped frame is mounted on the surface; The second rotating shaft is rotatably connected to the slide cylinder, and a second V-shaped frame is mounted on the surface of the second rotating shaft, and the end of the first V-shaped frame is hinged to the middle of the second V-shaped frame; The limiting frame is fixed to the end of the second V-shaped frame.

6. The film promotion device according to claim 2, wherein: The lifting unit comprises: The inner cylinder is slidably connected in the clamping frame and has an outer cylinder slidably connected on its outer surface; A fixed frame is fixed in the outer cylinder and is internally slidably connected with a threaded rod; A rotating rod is rotatably connected to the outer cylinder, a first gear is mounted on the surface of the rod, and a handle is mounted on the end thereof; The second gear is installed on the end of the threaded rod and is meshed with the first gear.

7. The film promotion device according to claim 6, wherein: The placement unit includes: The groove frame is fixed to the side of the outer cylinder and is internally connected to the third gear for rotation; The first sliding rack is slidably connected in the groove frame and meshed with the third gear, and a support frame is installed at the end thereof; The second sliding rack is slidably connected to the side surface of the groove frame, meshed with the third gear, and has a clamp installed at its end.

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