A multimedia teaching device

Abstract

The application relates to the technical field of teaching facilities, in particular to a multimedia teaching device which comprises a table plate, two side plates, a computer mainframe, an air cylinder, a piston, a compression spring and a limiting piece. The lower parts of the two side plates are respectively provided with a supporting plate. The lower end of the side plate is provided with a bottom bracket. The upper surface of one supporting plate is provided with the computer mainframe. The top of the computer mainframe is in contact with the edge part of the lower surface of the table plate. The lower surfaces of the two supporting plates are respectively provided with an expansion piece for separating the bottom bracket from the ground. The side, away from the side plate, of the computer mainframe is provided with the air cylinder. The piston is slidably arranged in the air cylinder. The compression spring is arranged between the piston and the limiting ring. The top of the air cylinder and the computer mainframe are provided with the limiting piece which cooperates with the compression spring to make the piston slide in the air cylinder. The application has the following beneficial effects: the table plate does not need to be manually moved and reset when the lower side of the table plate is cleaned, and the hidden dangers of shaking, sliding, knocking and damaging of the computer mainframe and the display during the moving process are avoided.

Description

Technical Field

[0001] This invention relates to the field of teaching facilities technology, specifically a multimedia teaching device. Background Technology

[0002] As an essential infrastructure for modern classroom teaching, computers are arranged in a one-person-one-computer layout, which facilitates multimedia teaching, practical training and information-based teaching, and can meet the needs of daily classroom teaching and students' independent computer operation.

[0003] The area where the computer desk's legs meet the floor has long been a blind spot and dead zone for classroom cleaning. During routine classroom floor cleaning, cleaning tools struggle to reach under the desk and around the legs. Traditionally, cleaning the bottom of the desk and these hard-to-reach areas requires manually moving the entire desk to create cleaning space, then returning it to its original position after cleaning. This process is not only labor-intensive and cumbersome, but the repeated movement of the desk can easily cause it to wobble and tilt. Computers placed on the desk are prone to slipping, falling, or being damaged due to the movement and shifting of the center of gravity, posing a safety hazard. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a multimedia teaching device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multimedia teaching device includes a tabletop with two notches on its upper surface. Side panels are installed within each of the two notches. Support plates are installed on the lower sides of the two side panels facing each other. A base bracket is installed at the lower end of each side panel. A computer host is mounted on the upper surface of one support plate, with its top contacting the edge of the lower surface of the tabletop. Extension members for detaching the base bracket from the ground are installed on the lower surfaces of both support plates. An air cylinder is located on the side of the computer host away from the side panels. The air cylinder is connected to the support plate on the lower side of the computer host. A limiting ring is installed at the bottom of the air cylinder. A piston is slidably installed inside the air cylinder. A compression spring is provided between the piston and the limiting ring. A limiting member, cooperating with the compression spring, is provided between the top of the air cylinder and the computer host to allow the piston to slide within the air cylinder. The air cylinder is connected to the two extension members via a connecting pipe. Relying on the downward pressure of the computer host when it is placed, the pneumatic pipeline is driven to support the bottom extension and lift the original base bracket off the ground. Without the need to manually move the table, the dead corner between the base bracket and the ground is exposed, making it easy for cleaning tools to reach in and clean. This solves the problem of dust accumulation and difficulty in cleaning the bottom and around the support legs of traditional multimedia desks. At the same time, there is no need to manually move or reset the table, avoiding the risk of the computer host and monitor shaking, slipping, or being damaged by bumps during the movement.

[0006] Specifically, the tabletop has a middle plate on its upper side, which is fixedly connected to the side plates. A monitor for use with the computer host is mounted on the upper surface of the middle plate. A top plate for temporarily storing the computer host is mounted on the upper side of the middle plate, and the top plate is fixedly connected to the upper end of the side plates. This layered layout of the middle plate, monitor, and top plate, and the organized arrangement of the monitor and computer host, conforms to the usage habits of multimedia teaching and hands-on operation.

[0007] Specifically, the limiting component includes a linkage plate. A linkage plate is provided between the computer host and the air cylinder. The linkage plate has a "Z"-shaped structure. The horizontal portion of the lower end of the linkage plate extends to the lower side of the computer host and contacts the bottom of the computer host. The horizontal portion of the upper end of the linkage plate extends to the upper side of the air cylinder. A multi-faceted hole is formed on the upper surface of the air cylinder, and a multi-faceted rod is inserted into the multi-faceted hole. The lower end of the multi-faceted rod contacts the piston, and the upper end of the multi-faceted rod is connected and fixed to the horizontal portion of the upper end of the linkage plate. When the horizontal portion of the lower end of the linkage plate is below the computer host, the compression spring is in a compressed state. This linkage plate, multi-faceted rod, and piston linkage structure can sense the placement and removal status of the computer host. The compression spring is automatically compressed and the air chamber is ventilated by the pressure of the computer host. The mechanical linkage requires no additional electrical control. The multi-faceted rod and multi-faceted hole cooperate to guide the movement, and the extension part automatically extends and retracts, and the base bracket automatically lifts off the ground and falls back down.

[0008] Specifically, the extension includes a horizontal tube, and a horizontal tube is installed on the lower surface of both of the two trays. The horizontal tube is arranged parallel to the base bracket. The cross-section of the horizontal tube is rectangular. A first rectangular frame is installed at both ends of the horizontal tube. A straight rectangular tube is inserted into each of the two first rectangular frames. A first rubber frame is fitted onto the end of the straight rectangular tube inside the horizontal tube and is slidably installed inside the horizontal tube. A second rectangular frame is installed at the end of the straight rectangular tube outside the horizontal tube. A right-angled rectangular tube is slidably installed inside the second rectangular frame. The two ends of the right-angled rectangular tube are respectively fitted with a second rubber frame and a third rubber frame that are bonded to the right-angled rectangular tube. The second rubber frame is slidably installed inside the straight rectangular tube. A vertical rectangular tube is fitted on the vertical part of the right-angled rectangular tube. A base is installed at the bottom of the vertical rectangular tube. The third rubber frame is slidably installed inside the vertical rectangular tube. A third rectangular frame is installed at the upper end of the vertical rectangular tube. The third rectangular frame is fitted on the right-angled rectangular tube and slidably engages with the right-angled rectangular tube. A hollow tube communicating with the horizontal tube is installed at the middle position of the two horizontal tubes. The end of the connecting tube away from the air cylinder is connected to the hollow tube. By using a sealed sliding structure of rectangular tubes, right-angled rectangular tubes, straight rectangular tubes, horizontal tubes, and first, second, and third rubber frames, a retractable and sealed air passage cavity is formed. When air pressure is injected, it extends to support the structure step by step; when air is depressurized, it retracts and stores itself, which can stably support the weight of the entire set of desks.

[0009] Specifically, connecting lugs are installed at the midpoint of the two parallel sides of the horizontal tube. These connecting lugs are connected to the support plate by multiple screws. The lower end of the air cylinder is fitted with a connecting part for connection and fixation. This connecting part is located below one of the connecting lugs, and screws that restrict the relative position of the connecting lugs and the support plate pass through the connecting part. The modular locking assembly of the horizontal tube, air cylinder, and support plate is achieved through the connecting lugs and screws, ensuring reliable installation and positioning, and facilitating disassembly and maintenance.

[0010] Specifically, a keyboard tray is provided at the lower front side of the table. The keyboard tray has an "L"-shaped structure, and its two ends are connected to the two side panels respectively. The addition of the keyboard tray conforms to ergonomic operating habits and makes it convenient for students to place their keyboards for hands-on practice.

[0011] Specifically, each of the two side plates has a rectangular opening at the lower part of its opposite surface. The end of the hollow tube passes through the rectangular opening, and a reinforcing rib is provided on the lower side of the hollow tube. The two ends of the reinforcing rib are connected to the two side plates respectively. The rectangular hollow tube provides space for the arrangement, and the reinforcing rib improves the stability of the connection between the two side plates.

[0012] Specifically, a multi-faceted sleeve is provided on the upper side of the multi-faceted hole, concentrically arranged with the multi-faceted hole. The lower end of the multi-faceted sleeve is connected and fixed to the air cylinder. A multi-faceted sealing sleeve is glued inside the multi-faceted sleeve, and the sealing sleeve wraps around the multi-faceted rod. The multi-faceted sleeve and the sealing sleeve cooperate with each other to improve the sealing performance between the multi-faceted rod and the multi-faceted hole.

[0013] Specifically, an L-shaped plate is installed on the upper surface of the air cylinder. A threaded hole is formed on the upper horizontal surface of the L-shaped plate, and a semi-threaded screw is threaded into the hole. A vertical hole, concentrically arranged with the semi-threaded screw, is formed on the upper surface of the air cylinder. The lower part of the outer surface of the semi-threaded screw is unthreaded. The lower end of the semi-threaded screw passes through the vertical hole and extends to the upper part of the air cylinder. Under the constraint of the semi-threaded screw, the piston does not move to the top of the air cylinder under the action of the compression spring's rebound force, preventing the base from directly contacting the ground. A handle is installed on the upper end of the semi-threaded screw. The L-shaped plate, semi-threaded screw, and handle form a stroke limit adjustment mechanism. The lifting and lowering of the semi-threaded screw can be controlled by manually turning the handle, limiting the piston's upward stroke and thus controlling the extension's support height from the ground. This allows for a slow and stable landing of the base and a smooth switching between support states, preventing sudden sinking of the tabletop and resulting wobbling or shifting, protecting the monitor and computer host from vibration. Simultaneously, the ground clearance can be flexibly adjusted according to cleaning needs, adapting to various cleaning tools.

[0014] Specifically, a circular sleeve is provided on the upper side of the vertical hole, concentrically arranged with the vertical hole. The lower end of the circular sleeve is connected and fixed to the air cylinder. A rubber sleeve is glued inside the circular sleeve, and the rubber sleeve wraps around the unthreaded part of the semi-threaded screw. The rubber sleeve and the circular sleeve work together to improve the sealing between the semi-threaded screw and the vertical hole.

[0015] The beneficial effects of this invention are: When the computer host is placed on a tray, the lower horizontal part of the linkage plate is pressed down by the computer host. Because the top of the computer host is limited by the edge of the tray, the lower end of the multi-faceted rod moves to the lower position inside the air cylinder under the pressure of the computer host. The piston and the limiting ring then work together to compress the spring. At this time, air flows into the air cylinder from the space formed by the vertical rectangular tube, right-angled rectangular tube, straight rectangular tube, and horizontal tube. The base then lifts off the ground. In this situation, the pedestrian walkway outside the base bracket should be mopped and cleaned, and then the meter... As the computer host is removed from the tray, the air in the air cylinder is expelled under the rebound force of the compression spring. At this time, the structure formed by the vertical rectangular tube, right-angled rectangular tube, straight rectangular tube, and horizontal tube unfolds, and the base contacts the cleaned ground of the pedestrian walkway. At the same time, the base bracket is lifted off the ground, making it convenient to clean the area on the ground under the base bracket. There is no need to manually move, carry, and reset the table, saving the heavy process of moving tables and chairs during cleaning. It also avoids the risk of the computer host and monitor slipping and being damaged due to shaking and shifting center of gravity when moving the table.

[0016] The addition of a semi-threaded screw limiting structure allows for flexible control of the piston stroke. This ensures that even when the computer host loses its limiting effect on the linkage rod, the base bracket remains stationary on the ground. At this point, the base is not in contact with the ground. Then, by turning the semi-threaded screw with the handle, the screw gradually moves upward. Consequently, the piston moves upward slowly under the restoring force of the compression spring, allowing the base to contact the ground at a slower speed. Subsequently, the base and base bracket switch to a stable state, preventing the table from wobbling. At the same time, the ground clearance can be adjusted according to cleaning needs to accommodate different cleaning tools.

[0017] After the computer host is moved to the tray, it is temporarily placed on the top plate, so that the center of gravity of the tabletop is in the central area. This helps the four downward-moving vertical rectangular tubes to provide balanced support for the tabletop and prevents the tabletop from tilting during the lifting process. When the computer host is placed on the tray, one edge of the tabletop works together with the compression spring to limit the computer host and prevent it from falling. Attached Figure Description

[0018] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a multimedia teaching device according to the present invention; Figure 2 This is a perspective view of a multimedia teaching device according to the present invention. Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 for Figure 1 Enlarged view at point B in the middle; Figure 5 This is a schematic diagram of the assembly of hollow tube, horizontal tube, vertical rectangular tube, linkage plate, semi-threaded screw and air cylinder in a multimedia teaching device of the present invention. Figure 6 for Figure 5 Top view; Figure 7 for Figure 6 Sectional view of AA; Figure 8 for Figure 6 BB section view; Figure 9 This is a schematic diagram of the exploded structure of the compression spring, piston, multi-faceted rod, semi-threaded screw, limiting ring, and air cylinder in a multimedia teaching device of the present invention; Figure 10 This is an exploded structural diagram of the vertical rectangular tube, right-angled rectangular tube, straight rectangular tube, and horizontal tube in a multimedia teaching device of the present invention; In the picture: 100. Tabletop; 101. Side panel; 1011. Middle panel; 1012. Top panel; 102. Keyboard tray; 103. Base bracket; 104. Rectangular opening; 105. Reinforcing rib; 106. Tray; 200. Computer host; 201. Monitor; 300. Air pump; 301. Connecting pipe; 302. Linkage plate; 3021. Multi-faceted rod; 3022. Multi-faceted sleeve; 3023. Sealing sleeve; 303. Connecting part; 304. Limiting ring; 305. Hollow tube; 306. Piston; 3061. Compression spring; 400, L-shaped plate; 401, semi-threaded screw; 4011, handle; 402, round sleeve; 4021, rubber sleeve; 500, Horizontal tube; 501, Vertical rectangular tube; 5011, Base; 5012, Third rectangular frame; 502, First rectangular frame; 503, Straight rectangular tube; 5031, Second rectangular frame; 5032, First rubber frame; 504, Right-angled rectangular tube; 5041, Second rubber frame; 5042, Third rubber frame. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] Please see Figures 1 to 10 The present invention provides a technical solution: a multimedia teaching device, including a tabletop 100, with two notches on the upper surface of the tabletop 100, and side plates 101 installed in each of the two notches. A base bracket 103 is installed at the lower end of the side plates 101. The base bracket 103 and the side plates 101 together support the tabletop 100. A rectangular opening 104 is opened at the lower part of the opposite surface of the two side plates 101. The end of the hollow tube 305 passes through the rectangular opening 104. A reinforcing rib 105 is provided on the lower side of the hollow tube 305. The two ends of the reinforcing rib 105 are respectively connected to the two side plates 101. The reinforcing rib 105 improves the stability of the connection of the side plates 101.

[0021] Each of the two side panels 101 has a support plate 106 installed on its lower back. A computer host 200 is mounted on the upper surface of one support plate 106. The top of the computer host 200 contacts the edge of the lower surface of the tabletop 100. When the computer host 200 is placed on the support plate 106, an edge of the tabletop 100, together with a compression spring 3061, limits the movement of the computer host 200, preventing it from falling. A middle plate 1011 is located on the upper side of the tabletop 101, and is connected and fixed to the side panels 101. The upper surface of the table 100 is equipped with a monitor 201 that works with the computer host 200. The lower front part of the table 100 is equipped with a keyboard tray 102. The keyboard tray 102 has an "L" shape. The two ends of the keyboard tray 102 are connected to the two side panels 101 respectively. The "L" shaped keyboard tray 102 conforms to the ergonomic design. The upper side of the middle plate 1011 is equipped with a top plate 1012 for temporarily storing the computer host 200. The top plate 1012 is connected and fixed to the upper end of the side panel 101. The table 100, the middle plate 1011, and the top plate 1012 form a multi-layer storage space.

[0022] A linkage plate 302 is provided between the computer host 200 and the air pump 300. The linkage plate 302 has a "Z"-shaped structure. The horizontal part of the lower end of the linkage plate 302 extends to the lower side of the computer host 200 and contacts the bottom of the computer host 200. The horizontal part of the upper end of the linkage plate 302 extends to the upper side of the air pump 300. A polygonal hole is opened on the upper surface of the air pump 300, and a polygonal rod 3021 is inserted into the polygonal hole. The lower end of the polygonal rod 3021 contacts the piston 306, and the upper end of the polygonal rod 3021 is connected and fixed to the horizontal part of the upper end of the linkage plate 302. The water at the lower end of the linkage plate 302... When the flat part is under the computer host 200, the compression spring 3061 is in a compressed state. A polygonal sleeve 3022 is provided on the upper side of the polygonal hole and is arranged concentrically with the polygonal hole. The lower end of the polygonal sleeve 3022 is connected and fixed to the air cylinder 300. A polygonal sealing sleeve 3023 is glued inside the polygonal sleeve 3022. The sealing sleeve 3023 wraps around the polygonal rod 3021. The polygonal sleeve 3022 supports the sealing sleeve 3023. The sealing sleeve 3023 improves the sealing between the polygonal rod 3021 and the polygonal sleeve 3022, preventing air in the air cylinder 300 from leaking out of the polygonal hole.

[0023] An air cylinder 300 is provided on the side of the computer host 200 away from the side plate 101. A limit ring 304 is installed at the bottom of the air cylinder 300. A piston 306 is slidably installed inside the air cylinder 300. A compression spring 3061 is provided between the piston 306 and the limit ring 304. When the computer host 200 is placed on the tray 106, the lower horizontal part of the linkage plate 302 is pressed by the computer host 200. Since the top of the computer host 200 is limited by the edge of the table 100, the lower end of the polygonal rod 3021 moves to the lower part of the air cylinder 300 under the pressure of the computer host 200. Then, the piston 306 and the limit ring 304 work together to squeeze the compression spring 3061.

[0024] Connecting ears are installed at the middle of the two parallel sides of the horizontal tube 500. The connecting ears are connected to the support plate 106 by multiple screws, so that the horizontal tube 500 is installed on the lower surface of the two support plates 106. The lower end of the air cylinder 300 is fitted with a connecting part 303 that is connected and fixed to the air cylinder 300. The connecting part 303 is located on the lower side of a connecting ear, so that the screw that restricts the relative position between the connecting ear and the support plate 106 passes through the connecting part 303, thereby reducing the number of screws used.

[0025] A rectangular cross-section horizontal tube 500 is arranged parallel to the base bracket 103. A first rectangular frame 502 is installed at both ends of the horizontal tube 500. A straight rectangular tube 503 is inserted into each of the first rectangular frames 502. A first rubber frame 5032, bonded to the end of the straight rectangular tube 503 inside the horizontal tube 500, is slidably installed inside the horizontal tube 500. A second rectangular frame 5031 is installed at the end of the straight rectangular tube 503 outside the horizontal tube 500. A right-angled rectangular tube 504 is slidably installed inside the second rectangular frame 5031. A second rubber frame 5041 and a third rubber frame 5042, bonded to the ends of the right-angled rectangular tube 504, are respectively fitted onto the ends of the right-angled rectangular tube 504. The second rubber frame 5041 is slidably installed inside the straight rectangular tube 503. The vertical... A vertical rectangular tube 501 is fitted onto the vertical section, and a base 5011 is installed at the bottom of the vertical rectangular tube 501. A third rubber frame 5042 is slidably installed inside the vertical rectangular tube 501. A third rectangular frame 5012 is installed at the upper end of the vertical rectangular tube 501. The third rectangular frame 5012 is fitted onto the right-angled rectangular tube 504 and slides in cooperation with the right-angled rectangular tube 504. A hollow tube 305 communicating with the horizontal tube 500 is installed in the middle of the two horizontal tubes 500. The end of the connecting tube 301 away from the air cylinder 300 is connected to the hollow tube 305. A retractable and sealed air passage cavity is formed by using a rectangular tube, a right-angled rectangular tube 504, a straight rectangular tube 503, and a horizontal tube 500 in cooperation with the first rubber frame 5032, the second rubber frame 5041, and the third rubber frame 5042. When air pressure is filled, it extends step by step to support and retracts when air is exhausted.

[0026] When the computer host 200 is placed on the tray 106, the weight of the computer host 200 presses down on the horizontal part of the lower end of the linkage plate 302. At the same time, the top of the computer host 200 is constrained by the edge of the tabletop 100. Under the pressure of the computer host 200, the polygonal rod 3021 is driven to slide down to the lower part of the air cylinder 300, causing the piston 306 to work with the limiting ring 304 to compress the spring 3061 synchronously. At this time, the air in the closed space formed by the horizontal tube 500, the straight rectangular tube 503, the right-angled rectangular tube 504 and the vertical rectangular tube 501 is drawn into the air cylinder 300, causing the base 5011 to be retracted and lifted off the ground. Only the bottom bracket 103 is left to form a desk with the side plate 101, the tabletop 100, etc., so that the passage area outside the desk can be mopped and cleaned.

[0027] After the computer host 200 is removed from the tray 106, the compression spring 3061 releases its elastic rebound force, pushing the piston 306 to reset, and expelling the air in the air cylinder 300 in the opposite direction into the sealed space formed by the horizontal tube 500, the straight rectangular tube 503, the right-angled rectangular tube 504, and the vertical rectangular tube 501. Under the action of air pressure, the right-angled rectangular tube 504, the straight rectangular tube 503, and the vertical rectangular tube 501 extend, and the base 5011 descends and is supported on the cleaned ground. At the same time, the original base bracket 103 is lifted off the ground, exposing the previously hard-to-clean corners under the bracket, making it easier to clean the hidden areas under the desks.

[0028] The entire process does not require manual moving, shifting, or resetting of the tabletop 100, eliminating the need to move the tabletop 100 during cleaning. It also avoids the safety hazards of tabletop wobbling and center of gravity shifting during the movement of the desk, which could cause the computer host 200 and monitor 201 to slip, bump, or be damaged.

[0029] An L-shaped plate 400 is mounted on the upper surface of the air cylinder 300. A threaded hole is formed on the upper horizontal surface of the L-shaped plate 400, and a semi-threaded screw 401 is threaded into the threaded hole. A vertical hole, concentrically arranged with the semi-threaded screw 401, is formed on the upper surface of the air cylinder 300. The lower part of the outer surface of the semi-threaded screw 401 is unthreaded. The lower end of the semi-threaded screw 401 passes through the vertical hole and extends to the upper part of the air cylinder 300. Under the constraint of the semi-threaded screw 401, the piston 306 is compressed by the rebound force of the spring 3061. The bottom does not move to the top of the air pump 300 and the base 5011 does not directly contact the ground. The upper end of the semi-threaded screw 401 is equipped with a handle 4011. A circular sleeve 402 is provided on the upper side of the vertical hole and is arranged concentrically with the vertical hole. The lower end of the circular sleeve 402 is connected and fixed to the air pump 300. A rubber sleeve 4021 is glued inside the circular sleeve 402. The rubber sleeve 4021 wraps around the unthreaded part of the semi-threaded screw 401 and prevents air in the air pump 300 from leaking through the vertical hole.

[0030] The added semi-threaded screw 401 limiting structure can flexibly limit the travel of the piston 306. When the computer host 200 moves away from the tray 106 and no longer exerts downward pressure on the linkage plate 302, the base bracket 103 can be kept on the ground for support, allowing the base 5011 to be temporarily suspended without contact with the ground. Then, by rotating the semi-threaded screw 401 through the handle 4011, it can be moved upward gradually. The piston 306 can then move upward smoothly and slowly under the elastic force of the compression spring 3061, causing the base 5011 to fall at a uniform speed and gently fit the ground. This achieves a smooth support switch between the base 5011 and the base bracket 103, preventing the table 100 from shaking or bumping when the support force is switched. At the same time, the ground clearance of the base bracket 103 can be flexibly adjusted according to the actual cleaning needs, making it suitable for various cleaning tools to be inserted for operation, thus enhancing its versatility.

[0031] The computer host 200 removed from the pallet 106 is temporarily placed on the top plate 1012, which keeps the center of gravity of the entire tabletop 100 in a central and balanced state. The four vertical rectangular tubes 501 can evenly distribute the load-bearing pressure, ensuring balanced and consistent force distribution and preventing the tabletop 100 from tilting or shifting during lifting and support switching.

[0032] The total weight of the tabletop 100, side panel 101, tray 106, base bracket 103, monitor 201, and computer host 200 is approximately 25kg. The theoretical minimum elastic force of the compression spring 3061, which supports a 25kg load, is: F=mg=25×9.8=245N. The compression spring 3061 adopts a national standard cylindrical helical compression spring, and the material is selected from 65Mn spring steel or carbon spring steel. Under the working deformation stroke, the compression spring 3061 outputs an elastic force of 300~320N, which meets the requirement of supporting a 25kg load.

[0033] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multimedia teaching device, comprising a tabletop (100), characterized in that: The tabletop (100) has two notches on its upper surface, and a side panel (101) is installed in each of the two notches. A support plate (106) is installed on the lower part of the opposite side of the two side panels (101). A base bracket (103) is installed at the lower end of the side panel (101). A computer host (200) is mounted on the upper surface of one of the support plates (106). The top of the computer host (200) contacts the edge of the lower surface of the tabletop (100). An extension for lifting the base bracket (103) off the ground is installed on the lower surface of both support plates (106). The side of the computer host (200) away from the side panel (101) is provided with... There is an air cylinder (300), which is connected to a support plate (106) on the lower side of the computer host (200). A limit ring (304) is installed at the bottom of the air cylinder (300). A piston (306) is slidably installed inside the air cylinder (300). A compression spring (3061) is provided between the piston (306) and the limit ring (304). A limit member is provided between the top of the air cylinder (300) and the computer host (200) to cooperate with the compression spring (3061) to allow the piston (306) to slide inside the air cylinder (300). The air cylinder (300) is connected to two extension parts through a connecting pipe (301).

2. The multimedia teaching device according to claim 1, characterized in that: The tabletop (100) has a middle plate (1011) on its upper side. The middle plate (1011) is connected and fixed to the side plate (101). The upper surface of the middle plate (1011) is provided with a monitor (201) that cooperates with the computer host (200). The middle plate (1011) has a top plate (1012) on its upper side for temporarily storing the computer host (200). The top plate (1012) is connected and fixed to the upper end of the side plate (101).

3. The multimedia teaching device according to claim 2, characterized in that: The limiting component includes a linkage plate (302). The linkage plate (302) is provided between the computer host (200) and the air cylinder (300). The linkage plate (302) has a "Z" shaped structure. The horizontal part of the lower end of the linkage plate (302) extends to the lower side of the computer host (200) and contacts the bottom of the computer host (200). The horizontal part of the upper end of the linkage plate (302) extends to the upper side of the air cylinder (300). A polygonal hole is opened on the upper surface of the air cylinder (300). A polygonal rod (3021) is inserted into the polygonal hole. The lower end of the polygonal rod (3021) contacts the piston (306). The upper end of the polygonal rod (3021) is connected and fixed to the horizontal part of the upper end of the linkage plate (302). When the horizontal part of the lower end of the linkage plate (302) is under the computer host (200), the compression spring (3061) is in a compressed state.

4. A multimedia teaching device according to claim 3, characterized in that: The extension includes a horizontal tube (500), and a horizontal tube (500) is installed on the lower surface of both of the two trays (106). The horizontal tube (500) is arranged parallel to the base bracket (103). The horizontal tube (500) has a rectangular cross-section. A first rectangular frame (502) is installed at both ends of the horizontal tube (500). A straight rectangular tube (503) is inserted in each of the two first rectangular frames (502). A first rubber frame (5032) is fitted to the straight rectangular tube (503) at one end inside the horizontal tube (500). The first rubber frame (5032) is slidably installed in the horizontal tube (500). A second rectangular frame (5031) is installed at one end of the straight rectangular tube (503) outside the horizontal tube (500). A right-angled rectangular tube (504) is slidably installed in the second rectangular frame (5031). The two ends of the right-angled rectangular tube (504) are respectively fitted with a second rubber frame (5041) and a third rubber frame (5042) that are bonded to the right-angled rectangular tube (504). The second rubber frame (5041) is slidably installed inside the straight rectangular tube (503). A vertical rectangular tube (501) is fitted on the vertical part of the right-angled rectangular tube (504). A base (5011) is installed at the bottom of the vertical rectangular tube (501). The third rubber frame (5042) is slidably installed inside the straight rectangular tube (503). Installed inside a vertical rectangular tube (501), the upper end of the vertical rectangular tube (501) is equipped with a third rectangular frame (5012), the third rectangular frame (5012) is sleeved on a right-angled rectangular tube (504) and slides in cooperation with the right-angled rectangular tube (504), a hollow tube (305) communicating with the horizontal tube (500) is installed in the middle of the two horizontal tubes (500), and the end of the connecting tube (301) away from the air cylinder (300) is connected to the hollow tube (305).

5. A multimedia teaching device according to claim 4, characterized in that: The horizontal tube (500) has connecting ears installed at the middle of its two parallel sides. The connecting ears are connected to the support plate (106) by multiple screws. The lower end of the air cylinder (300) is fitted with a connecting part (303) that is fixed to the air cylinder (300). The connecting part (303) is located on the lower side of a connecting ear. The screw that restricts the relative position of the connecting ear and the support plate (106) passes through the connecting part (303).

6. A multimedia teaching device according to claim 1, characterized in that: The lower front part of the tabletop (100) is provided with a keyboard tray (102), which has an "L" shaped structure. The two ends of the keyboard tray (102) are respectively connected to two side panels (101).

7. A multimedia teaching device according to claim 4, characterized in that: A rectangular opening (104) is provided at the lower part of the opposite surface of the two side plates (101). The end of the hollow tube (305) passes through the rectangular opening (104). A reinforcing rib (105) is provided on the lower side of the hollow tube (305). The two ends of the reinforcing rib (105) are respectively connected to the two side plates (101).

8. A multimedia teaching device according to claim 4, characterized in that: The upper side of the multi-faceted hole is provided with a multi-faceted sleeve (3022) arranged concentrically with the multi-faceted hole. The lower end of the multi-faceted sleeve (3022) is connected and fixed to the air cylinder (300). A multi-faceted sealing sleeve (3023) is glued inside the multi-faceted sleeve (3022). The sealing sleeve (3023) is wrapped around the multi-faceted rod (3021).

9. A multimedia teaching device according to claim 1, characterized in that: An L-shaped plate (400) is installed on the upper surface of the air cylinder (300). A screw hole is opened on the upper surface of the horizontal part of the L-shaped plate (400). A half-thread screw (401) is connected to the screw hole by a thread. A vertical hole is opened on the upper surface of the air cylinder (300) and arranged concentrically with the half-thread screw (401). The lower part of the outer surface of the half-thread screw (401) is not machined with threads. The lower end of the half-thread screw (401) passes through the vertical hole and extends to the upper part of the air cylinder (300). Under the restriction of the half-thread screw (401), the piston (306) does not move to the top of the air cylinder (300) under the action of the rebound force of the compression spring (3061) and the base (5011) does not directly contact the ground. A handle (4011) is installed on the upper end of the half-thread screw (401).

10. A multimedia teaching device according to claim 9, characterized in that: A circular sleeve (402) is provided on the upper side of the vertical hole and is arranged concentrically with the vertical hole. The lower end of the circular sleeve (402) is connected and fixed to the air cylinder (300). A rubber sleeve (4021) is glued inside the circular sleeve (402) and the rubber sleeve (4021) is wrapped around the unthreaded part of the semi-threaded screw (401).

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