Multimedia demonstration device

Abstract

The invention relates to a multimedia demonstration device, and discloses a device which can prevent a lecturer from shielding multimedia projection during walking, ensure normal watching and learning of students below, clean a projection screen and avoid dust generated by long-time use of the projection screen. The device is characterized in that two fixing seats are fixedly arranged on the top of the protective cover through nuts, each fixing seat is composed of an L-shaped plate and a triangular reinforcing rib, one end of each L-shaped plate is fixedly arranged on the edge of the protective cover through two rows of nuts, the other end of each L-shaped plate extends out of the protective cover from the edge of the protective cover and then is bent upwards by 90 degrees, two through holes are formed in the other end of each L-shaped plate, the other end of each L-shaped plate is close to one side of the protective plate, the triangular reinforcing rib is fixedly arranged in the middle of each L-shaped plate, reinforcing bases are arranged at the two ends of the protective cover and are L-shaped structures, and one end of each L-shaped structure is fixedly arranged on the edge of the end of the protective cover through the nut.

Description

technical field [0001] The invention relates to a multimedia demonstration device, which belongs to the technical field of projectors. In particular, it relates to a device that can avoid blocking the multimedia projection when the lecturer walks, ensures the normal viewing and learning of the students below, and can clean the projection screen at the same time to avoid dust generated by using the projection screen for a long time. Background technique [0002] At present, multimedia projection demonstration devices are widely used in various industries, and are mostly used in the environment of large-scale lectures, classroom teaching and training explanations. However, the existing multimedia demonstration devices used in teaching and training are mostly through optical projection. The projector is projected on the projection screen, and the lecturer usually walks back and forth habitually on the podium when giving an explanation, which can easily block the demonstration s...

AI Technical Summary

Problems solved by technology

[0002] At present, multimedia projection demonstration devices are widely used in various industries, and are mostly used in the environment of large-scale lectures, classroom teaching and training explanations. However, the existing multimedia demonstration devices used in teaching and training are mostly through optical projection. The projector is projected on the projection screen, and the lecturer usually walks back and forth habitually on the podium when giving an explanation, which can easily block the demonstration screen of the projector and the screen, resulting in the auditors and trainers below not seeing the panoramic projection Screens, and their impact on training and presentations

[0003] The notification number CN209343123U discloses a multifunctional display device capable of projection and demonstration, including a side bar and an arc top, the top of the side bar is fixedly connected with an arc top, and the inside of the side bar is fixedly connected with a first motor box and a second A motor box, the inside of the second motor box is provided with a first motor, the output end of the first motor is movably connected to a rotating shaft, and the side of the rotating shaft away from the first motor is fixedly connected to a curtain roll, the display device The curtain roll is a single-curtain roll structure. During the display, the screen on the roll is easily blocked by the lecturer walking back and forth, which affects the students' viewing and learning.

[0004] The notification number CN108535946A discloses a multifunctional teaching demonstration device, which includes a slide rail arranged on the platform, and two groups of display units are slidably connected to the slide rail, and each group of display units includes a curtain and a projection screen arranged in front of the curtain. instrument; the bottom end of the slide rail is provided with a plurality of airbags that can push the display unit to move; all airbags are connected together to form a foot pad covering the surface of the platform; and a hydraulic bag filled with clear water is arranged between the two airbags , all the hydraulic bladders are connected; the hydraulic bladder located on one side of the foot pad is connected with a water outlet pipe extending above the desk; a water cup for receiving water is arranged under the water outlet pipe, and the structure and function of this device are too complicated and the cost is relatively high

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