30 results about "Poor vision" patented technology

The utility model discloses an electric leakage warning device for electric power transmission, and relates to the technical field of electric power transmission equipment, the electric leakage warning device for electric power transmission comprises: a housing, the housing is provided with an opening, and an accommodating cavity is formed in the housing; the acousto-optic sensor is used for giving out an acousto-optic alarm; a part of the smell warning mechanism is arranged in the accommodating cavity, and the smell warning mechanism is electrically connected with the acousto-optic sensor; the electric leakage warning device for electric transmission has a first state, in the first state, the acousto-optic sensor gives out an acousto-optic alarm, and meanwhile, the smell warning mechanism gives out a preset smell. According to the invention, people can notice the alarm in a noisy environment and an environment with weak vision or poor vision, so that people can be reminded to pay attention to emergency situations in time, and life safety is guaranteed.

The utility model discloses an off-axis bifocal plane HUD optical system, which comprises an image source, an eye box, a lens, a first reflecting mirror, a second reflecting mirror and an automobile windshield, the image source comprises a first output part and a second output part, light of the first output part passes through the first reflecting mirror, the second reflecting mirror and the automobile windshield to enable the eye box to obtain a near focal plane, and light of the second output part passes through the first reflecting mirror, the second reflecting mirror and the automobile windshield. The light of the second output part passes through the lens, the first reflecting mirror, the second reflecting mirror and the automobile windshield to enable the eye box to obtain a far focal plane. The image source is divided into two parts, the lens is arranged on the light path of the second output part of the image source, and a near-focus virtual image and a far-focus virtual image are formed in front of the windshield, so that a driver can see the virtual image surface and timely obtain the driving information of the vehicle under the condition of poor visual field such as vehicle following or traffic jam, and the driving safety of the vehicle is improved. Therefore, the thickness of the crystalline lens can be adjusted when human eyes watch far and near focuses, and fatigue caused by long-time observation of a certain focal plane is avoided.

This utility model provides a visual safety guidance device for highway tunnels, relating to the technical field of tunnel guidance devices. It includes a mounting frame installed at the top of the tunnel facing the centerline of the wall at the diversion point, and several reflective modules mounted on the mounting frame. The mounting frame has inverted buckle portions on both sides of its bottom, and recessed holes are equidistantly spaced on the mounting frame, with spring bolt assemblies installed within these recessed holes. Each reflective module consists of a mounting base and a reflector, which are fixed together by bolts. The mounting base has a snap-fit ​​groove extending to both ends on one side corresponding to the recessed hole. This device is installed at the top of the tunnel, connecting to the diversion point at the tunnel's front end. Through the tunnel's lighting and the reflection from the reflectors, it effectively guides the driver's line of sight at the tunnel's front end, preventing collisions caused by obstructed vision or momentary distraction, especially for drivers with poor vision or astigmatism.

The present application relates to the field of vehicle control, in particular to a cleaning control method and device for a rear windshield of a vehicle and the vehicle. The present application can gradually solve the defects of the prior art by detecting the cleaning state of the front windshield and synchronously controlling the rear windshield to perform corresponding cleaning. First, the vehicle cleans the front windshield, which itself reflects that the current environment is prone to fogging, frosting and other shielding problems. This is used as a trigger condition to automatically start the rear windshield cleaning, avoiding the problem of delayed vision caused by forgetting to turn on the rear windshield heating. Second, the cleaning mode of the front windshield is used to synchronously control the rear windshield, which can quickly match the demisting or defrosting demand and timely eliminate the fog and shielding of the rear windshield, ensuring a clear central rearview mirror vision when changing lanes and eliminating the safety hazards caused by poor vision. At the same time, the actual cleaning demand is used as the driving force to replace the indiscriminate fixed time operation, avoiding unnecessary continuous work and effectively reducing energy consumption.

The present invention relates to the technical field of medical surgical instruments, and specifically relates to a shield surgical robot, which includes a sheath. An annular placement groove is formed on the sheath. An optical fiber endoscope tube is arranged inside the annular placement groove. A placement plate is arranged on one side of the sheath. A protective cleaning component is arranged on the side of the optical fiber endoscope tube close to the placement plate. A water storage chamber is arranged inside the annular placement groove. Jet mechanisms are arranged in an array on the side of the water storage chamber close to the protective cleaning component. A shield electrocautery rotary cutter head is movably arranged on the side of the placement plate far from the inside of the sheath. The present invention has the function of timely cleaning the broken tissues that block the view of the optical fiber endoscope tube. At the same time, during the entire cleaning process, it will not affect the medical staff's real-time observation of the patient's body, and avoids the situation that the medical staff damages healthy tissues when cutting hyperplastic tissues under poor vision conditions.

The cab comprises a front windshield assembly, a top assembly, a rear window assembly and a side door assembly, the front windshield assembly, the top assembly, the rear window assembly and the side door assembly are all provided with electric heating glass, and the electric heating glass comprises inner layer glass and outer layer glass. A thickness cavity is formed between the inner-layer glass and the outer-layer glass, tungsten filaments are uniformly and densely distributed in the thickness cavity, a power flow guide strip is designed on the edge of the thickness cavity, and the two ends of the tungsten filaments are connected with the positive electrode and the negative electrode of the power flow guide strip respectively. The glass is simple in structure, due to the fact that the tungsten filaments are arranged in the inner glass and the outer glass, when a forklift goes in and out of a warehouse, cab glass cannot be frozen and frosted, potential safety hazards caused by poor view are avoided, each piece of glass is independently controlled by the switch, and energy consumption of the whole forklift can be reduced.

The utility model provides a cooking utensil and a deep display device thereof, the deep display device comprises a light source module, a reflector and a semitransparent mirror, the light source module is controlled to generate light corresponding to the working state of the cooking utensil; the reflecting mirror is suitable for reflecting the light towards one side of a user; and the semitransparent mirror is suitable for focusing the light and changing the propagation direction of the light. Wherein the light source module, the reflector and the semitransparent mirror are arranged on the cooking utensil. According to the cooking utensil, the generated deep lighting effect can convert the plane lighting effect into the three-dimensional lighting effect, a user can conveniently observe the working state of the cooking utensil, especially the user can conveniently observe the working state of the cooking utensil in a long distance, and even a user with poor vision can clearly observe the working state of the cooking utensil.

The application discloses a kind of multi-target detection methods for mine excavation environment, belong to target detection technical field.The existing target detection method appears the problem of difficult target detection, low detection efficiency under the poor mine excavation environment such as poor vision of dust, rain and fog, in order to solve the problem, the neural network used based on Yolov5 algorithm is improved, SPPF layer is used instead of SPP layer, and light ECA attention mechanism is added, the performance is improved on the basis of retaining the original algorithm inference speed and lightness, so that the neural network pays more attention to the detection target, improves the detection effect, can meet the multi-target detection task under the poor environment of mine excavation.

The utility model relates to the technical field of automobile accessories, in particular to a pickup truck trunk portal frame which comprises a left guardrail used for being connected with the left side of a pickup truck trunk, a right guardrail used for being connected with the right side of the pickup truck trunk and a connecting guardrail. The left end of the connecting guardrail is detachably connected with the left guardrail through screws, and the right end of the connecting guardrail is detachably connected with the right guardrail through screws; and a brake lamp is arranged on one side, far away from the cab, of the connecting guardrail. According to the pickup truck, the brake lamp is arranged on the side, far away from the cab, of the connecting guardrail, so that when the pickup truck runs in a poor-sight environment, high-position brake reminding can be provided for a rear truck, and the rear-end collision risk of the rear truck is reduced. And secondly, the portal frame is provided with the left guardrail, the right guardrail and the connecting guardrail, so that the packaging and transporting size and the production cost can be reduced, and the maintenance cost of a vehicle owner on the portal frame can also be reduced.

Detecting obstacle elements, the detection performed with a visual aid device, the device including a distance sensor, the sensor being mounted in a wearable device to be worn by a user. Several embodiments allow the further detection of different types of obstacles, in order to map and signal them to a user with low-vision.

The utility model discloses a filtering type fire-fighting self-rescue respirator, which relates to the technical field of fire-fighting equipment and comprises a protective mask, a support is fixed below the outer surface of the protective mask, buckles are fixed on two sides of the support, a propping plate is fixed on the outer surface of the support, and the outer surface of the protective mask is connected with a mounting plate through a corrugated pipe. Through the arrangement of the support, the abutting plate, the buckle and the corrugated pipe, when the filter tank needs to be replaced, the filter tank is directly taken out of the buckle, then the filter tank is pulled to enable the corrugated pipe to be stretched, at the moment, the filter tank is moved to the position in front of the window so that a user can check the filter tank conveniently, and then the filter tank can be replaced; the phenomenon that the filter tank is difficult to correspond to the mounting plate due to poor visual field and the mounting time is relatively long is avoided, so that the situation that a user inhales smoke or suffocated for a long time due to the relatively long mounting time is avoided, the filter tank is buckled into the buckle after being replaced, and meanwhile, the corrugated pipe is shrunk; therefore, the installation is convenient.

The present application relates to the field of medical device technology, and in particular to an implantable fully intracavitary electric tubular stapler, the stapler comprising an anvil, an anastomosis assembly, and a rotating assembly. The stapler provided by the present application can be completely implanted in the abdominal cavity, solving the defects that the existing tubular stapler needs to cross the abdominal wall when used for laparoscopic surgery to complete anastomosis, resulting in poor vision and difficult operation; the anastomosis assembly is arranged relative to the anvil, and the distance between the anastomosis assembly and the anvil is adjustable in a predetermined direction. The anvil is connected to the anastomosis assembly via a rotating assembly, and the rotating assembly is used to change the angle between the anvil and the predetermined direction. According to the stapler provided by the present application, by changing the angle between the anvil and the predetermined direction, the difficulty of inserting the anvil is reduced, and the difficulty of removing the anvil from the anastomosis after the anastomosis is completed is reduced, thereby reducing the risk of damage to the anastomosis when the stapler is removed.

The invention provides a radar and vision fusion method and device based on binary Bayesian filtering, and relates to the technical field of multi-sensor target fusion. The method comprises the following steps: preprocessing visual acquisition data and radar acquisition data to obtain a visual detection result and a radar plot detection result; filtering invalid radar plots in combination with vehicle motion information, and determining a radar effective plot target; combining a visual detection result with a radar effective trace point target, and determining a first matching probability of each combination in the current period based on a radar and visual target attribute difference weight ratio; carrying out binary Bayesian filtering by taking the first matching probability as a prior probability to obtain a multi-cycle second matching probability; and finally, performing matching tracking on the target combination determined by the second matching probability, and fusing vision and radar detection results. Therefore, the problem of poor visual and radar correlation matching effect is effectively solved, and the accuracy and stability of multi-sensor target fusion are improved.

The invention relates to a safety step pitch detection system which comprises an induction module, an alarm module and a controller. The sensing module comprises a plurality of sensing units, and the sensing units are evenly distributed and installed on the same side of the tunnel wall face in the tunnel extending direction and connected into the controller in parallel; the controller is used for receiving the induction information transmitted by the induction unit, processing the induction information according to a built-in preset program, and sending an instruction to the alarm module according to a processing result; the alarm module comprises a plurality of alarm units which are installed in the tunnel and correspond to the sensing units in a one-to-one mode, and the alarm units are connected into the controller in parallel and used for receiving instructions sent by the controller and sending prompt information to the outside according to the instructions. The problems that in the prior art, when an automobile enters a tunnel or encounters atrocious weather in the driving process in the tunnel, a driver in the automobile is poor in sight, the distance between the driver and a front automobile is difficult to accurately control, traffic accidents are extremely prone to happening, property losses are caused, and even personal safety is harmed are solved.

The invention provides a vehicle glass visual field adjusting method and device, equipment and a storage medium. The method comprises the steps that face image information of a driver and passengers in a vehicle is acquired; the face image information comprises a face contour area of the driver and the passenger and a face contour position of the driver and the passenger; determining a view demand area of the driver and the passenger in the vehicle glass based on the face contour area of the driver and the passenger; adjusting optical data of vehicle glass in the view demand area to obtain a target optical mirror surface; wherein the target optical mirror surface is at least an optical mirror surface matched with eye degrees of a driver and passengers; and associating the face contour position of the driver and the passenger with the position of the target optical mirror surface, so that the position of the target optical mirror surface in the vehicle glass correspondingly changes along with the change of the face contour position of the driver and the passenger, according to the visual field adjusting method for the vehicle glass, the comfort degree of drivers and passengers with poor vision during long-time vehicle driving can be improved.

The embodiment of the present invention discloses a glasses tracking system, including glasses, a sound collection module and a voiceprint recognition server, the glasses include a prompt module, a first communication module and a battery module, the prompt module and the first communication module are both connected to the battery module, and the prompt module is connected to the first communication module; the glasses are connected to the voiceprint recognition server through the first communication module, and the sound collection module is connected to the voiceprint recognition server; the sound collection module is used to collect sound data and send the collected sound data to the voiceprint recognition server; the voiceprint recognition server is used to identify the connection information of the sound data according to the pre-trained voiceprint recognition model, and after successful identification, according to the identified connection information, send a prompt instruction to the prompt module through the corresponding first communication module; the prompt module is used to send a prompt sound after receiving the prompt instruction. The present application reduces the weight of the glasses, which is conducive to users with poor eyesight wearing glasses for a long time.

The invention discloses an air-ground dual-purpose automobile which comprises an automobile body, the automobile body is connected with a connecting rod rotating shaft, the connecting rod rotating shaft is connected with a connecting rod, and the connecting rod is connected with a propeller rotating shaft capable of changing the lifting force direction of a propeller with power. And the propeller rotating shaft capable of changing the lift force direction of the powered propeller is connected with the powered propeller. According to the air-ground dual-purpose automobile, the connecting rods and the propellers are stored backwards by controlling the connecting rod rotating shafts and the propeller rotating shafts capable of changing the lifting force direction of the power propellers, so that the limited space of the automobile is well utilized, and the problem that the sight is poor or a cockpit needs to rotate in the flying process of a traditional hovercar is solved; the travel convenience and comfort of people are improved, and development of low-altitude economy is well promoted.

The application discloses an automatic lifting type water washing urinal and belongs to the field of sanitary ware devices. The automatic lifting type water washing urinal comprises an embedding cavity, a groove is formed in the inside of the embedding cavity, a circular groove is formed in the lower surface of the inside of the groove, a motor one is fixedly connected to the inside of the circular groove, a threaded rod is fixedly connected to the top of the output end of the motor one, the top of the threaded rod is rotatably connected to the upper surface of the inside of the groove, and a sliding block with holes is threadedly connected to the outer side wall of the threaded rod. The automatic lifting type water washing urinal realizes the free height adjustment of the urinal body through the cooperation of the motor one, the threaded rod, the sliding block with holes and related locking structures. In actual application scenarios, the traditional fixed-height urinal is difficult to meet the use requirements of people with different heights, children have problems such as inconvenience in stepping and poor vision when using the urinal, and adults may be uncomfortable when bending over when using some low urinals.

The utility model discloses an insulin pen, belonging to the technical field of insulin pens. The device comprises a pen holder and a pen cover mounted on the pen holder, and is characterized in that a traction rope is detachably connected between the pen cover and the pen holder, a dosage visual window is embedded in the end of the pen holder away from the pen cover, a convex lens arranged along the circumferential direction of the pen holder is plugged into the pen cover, and a fixed cover is plugged into the end of the convex lens away from the pen cover; the insulin pen adopts the convex lens arranged on the pen cover to amplify the displayed content of the dosage visual window on the pen holder, and does not need to install additional structures such as a magnifying glass, is easy to use, and is convenient for use by the elderly or people with poor eyesight.

The disclosure is directed to devices for training the human brain to overcome the effects of amblyopia. Some examples include a divider placed between the left eye and the right eye of a user or wearer. Such examples reduce the portion of a user's field of vision of each eye that overlaps, which in turn reduces the degree to which the brain can rely on input from the dominant eye to compensate for poor vision in the weak eye. Some examples include an obstruction element that covers a portion of the field of vision of the dominant eye. Such devices convert binocular fields of view into bi-monocular fields of view. Such devices help a user to overcome the effects of amblyopia by training the brain to better utilize and integrate visual information from the weak eye.

The utility model discloses a sound feedback core training instrument which comprises an inflatable soft cushion, an extrusion sounder is installed in the middle of an inner cavity of the inflatable soft cushion, a connecting piece is arranged on one side of the inflatable soft cushion and connected with a hose, the end of the hose is connected with a connecting pipe, one end of the connecting pipe is connected with a pressure gauge, and the other end of the connecting pipe is connected with a pressure sensor. And the other end is connected with an inflating balloon. The device can be applied to patients with chronic lumbago, lumbar disc herniation, lumbar spinal stenosis and need to strengthen waist and abdomen core strength or stability by medical staff, can also be trained by the patients / people in need, is simple to operate, low in cost, convenient to use and easy to operate, can achieve the training target even if the eyesight is poor by utilizing sound feedback, and is suitable for popularization and application. And detection and training are integrally completed, so that the method can be used for evaluation and treatment, and is high in practicability.

The invention discloses a multi-hole arbitrary extension socket. The multi-hole arbitrary extension socket comprises a shell, a live wire contact piece and a zero wire contact piece, wherein the live wire contact piece and the zero wire contact piece are arranged in the shell. A plurality of jacks are sequentially arranged on the shell at intervals in the linear direction, the spacing distance between any two adjacent jacks in the same linear direction is equal, and the live wire contact pieces and the zero wire contact pieces are sequentially arranged in a staggered mode in the linear direction and are aligned with the corresponding jacks. The plug can be inserted into the two adjacent jacks at will to take electricity, specific jack combinations do not need to be distinguished and aligned, use convenience is improved, and the socket is particularly friendly to users with poor eyesight such as old people. Meanwhile, the insertion position of the plug can be adjusted at will, and the use requirements of different positions are met. In addition, the safety door is additionally arranged, when the socket is not used, the safety door can automatically close the jack, dust and foreign matter are prevented from entering the socket, potential safety hazards are effectively eliminated, use safety is ensured, reliability is high, electricity safety of children and adults is protected, and user experience is good.

The utility model discloses a rehabilitation assistive device for training mild cognitive impairment of old people, which comprises a fixed disc, and a bearing plate is mounted at the lower end of the front side of the fixed disc; the supporting plate is mounted at the lower end of the bearing plate, and mounting screws are arranged in through holes formed in the supporting plate; the observation assembly is arranged on the fixed disc; the rotating assembly is arranged at the rear end of the fixed disc; the cognitive card is attached to a groove formed in the rotating assembly. According to the rehabilitation assistive device for training the mild cognitive impairment of the old people, six cards can be fixed at the same time through the limiting assemblies, all the cards are sequentially recognized in a rotating mode, the situation that other cards attract attention of the old people can be effectively avoided, the recognized cards are replaced in the rotating mode, and therefore the rehabilitation assistive device for training the mild cognitive impairment of the old people is convenient to use. According to the device, the situation of recognition omission can be effectively avoided, the exercise effect is better, the purpose of amplifying the cards can be achieved through the observation assembly, and the situation that the recognition effect is affected due to poor vision of old patients is avoided.

The utility model relates to a display board for local information consultation, which comprises a supporting seat, a supporting rod is fixedly mounted at the top of the supporting seat, a display board main body is fixedly connected to the top of the supporting rod, a storage box body is fixedly connected to the front side of the supporting rod, and a box cover is slidably connected to the top of the storage box body. And an amplification assembly is arranged in the storage box body and comprises a spring rope, a clamping structure and a magnifying lens, and the spring rope is fixedly connected to the inner wall of the left side of the storage box body. According to the display board for local information consultation, by arranging the magnifying assembly, when a viewer has poor vision and needs a magnifying lens, a handle can slide rightwards to drive a box cover to slide rightwards, then the magnifying lens is pulled upwards and taken out, a spring rope plays a role in limiting the magnifying lens, and the magnifying lens is prevented from being lost; and the user can use the magnifying lens to magnify too small or fuzzy fonts and pictures on the display board, so that the information is clear and easy to read.

The present invention provides a wall skirting and wall system. The wall skirting includes a support, a bearing and a decorative panel. The bearing and the decorative panel are both mounted on the outer surface of the support, and the bearing is located above the decorative panel; the upper contact surface of the bearing can be in contact with the lower end surface of the wall panel, and a receiving groove is formed on the bearing, and the receiving groove can be used to install a lighting lamp; the outer surface of the support has a fixing portion, and the fixing portion is located above the bearing. By passing a fastener through the fixing portion and connecting with the wall, the support is fixedly mounted on the wall; the decorative panel avoids the notch of the receiving groove. Therefore, the wall skirting provided by the present application can be installed with a lighting lamp, which is beneficial for people with poor eyesight and mobility difficulties.

The invention discloses a multifunctional intelligent auxiliary glasses device for visually impaired people and computing equipment, and the device comprises a glasses body which comprises lenses, an image collection module integration area, a voice output module integration area, a man-machine interaction module integration area and a power supply module integration area; the image acquisition module is used for acquiring front image information in real time; the processing module is used for identifying characters, traffic lights, zebra crossings, steps / stairs, obstacles with preset distances, preset home environments and article positions in the image information through a visual space intelligent fusion network model; the voice output module is used for outputting the voice broadcast information generated by the processing module; the Bluetooth module is used for voice broadcasting; the man-machine interaction module is used for receiving instruction input of a user; and the power supply module comprises a solar automatic power storage unit and a battery unit. The intelligent auxiliary glasses help people with low eyesight maintain daily life and improve self-care ability.

The present application relates to the field of vehicle control, in particular to a cleaning control method and device for a rear windshield of a vehicle and the vehicle. The present application can gradually solve the defects of the prior art by detecting the cleaning state of the front windshield and synchronously controlling the rear windshield to perform corresponding cleaning. First, the vehicle cleans the front windshield, which itself reflects that the current environment is prone to fogging, frosting and other shielding problems. This is used as a trigger condition to automatically start the rear windshield cleaning, avoiding the problem of delayed vision caused by forgetting to turn on the rear windshield heating. Second, the cleaning mode of the front windshield is used to synchronously control the rear windshield, which can quickly match the demisting or defrosting demand and timely eliminate the fog and shielding of the rear windshield, ensuring a clear central rearview mirror vision when changing lanes and eliminating the safety hazards caused by poor vision. At the same time, the actual cleaning demand is used as the driving force to replace the indiscriminate fixed time operation, avoiding unnecessary continuous work and effectively reducing energy consumption.

The invention discloses a control method and device of a vehicle headlamp, a vehicle and a computer readable storage medium, the vehicle headlamp comprises an illumination module used for illumination and a projection module used for projection, and the control method of the vehicle headlamp comprises the steps that whether the vehicle is in a target driving scene or not is judged; if yes, the projection module is controlled to project a projection image used for indicating the vehicle following distance in front of the running vehicle, so that a user can judge the distance between the vehicle and the front vehicle, visual safe driving guidance is provided for a driver, and too concentrated brightness caused by close distance is avoided; therefore, traffic accidents such as rear-end collision and the like can be prevented, and the safety of road driving is integrally improved; meanwhile, by means of the control method of the vehicle headlamp, the problem that a traditional headlamp is poor in lighting effect at night or under the condition of poor sight is solved, and the overall science and technology feeling and intelligence feeling of the vehicle can be improved.

The invention discloses a control method and device of a vehicle headlamp, a vehicle and a computer readable storage medium, the vehicle headlamp comprises an illumination module used for illumination and a projection module used for projection, and the control method of the vehicle headlamp comprises the steps that when the vehicle runs, the width of a vehicle body is obtained; and based on the vehicle body width, controlling the projection module to project a projection image with the same width as the vehicle body width in front of the running vehicle so as to indicate whether the vehicle can smoothly pass through the current road section. The trafficability of the vehicle can be judged by observing the projection image projected on the ground, and a driver is helped to be prevented from driving on a road section which is not suitable for passing, so that the accident risk caused by misjudgment is reduced; meanwhile, by means of the control method of the vehicle headlight, the problem that a traditional headlight is poor in lighting effect at night or under the condition of poor sight is solved, more visual and accurate visual assistance is provided for a driver, and the overall science and technology feeling and the intelligent feeling of the vehicle can be improved.

The utility model relates to the technical field of display screens, and discloses an adjustable display screen which comprises a fixed box, a motor is fixedly connected to the inner wall of the front side of the fixed box, a rotating rod is fixedly connected to the driving end of the motor, gears are fixedly connected to the front side and the rear side of the outer portion of the rotating rod, and the gears are fixedly connected to the front side and the rear side of the outer portion of the rotating rod. Sliding rods are slidably connected to the front side and the rear side of the interior of the fixed box, racks are fixedly connected to the right sides of the sliding rods, limiting discs are fixedly connected to the exteriors of the rotating rods, a first rotating column is rotatably connected to the inner wall of the bottom of the fixed box, and a second rotating column is rotatably connected to the top of the first rotating column; the top of the second rotating column is rotationally connected with a sliding column, and the top of the sliding column is fixedly connected with a square plate. According to the utility model, the lifting of the display screen is realized, so that students can check the content on the screen more easily, and the reading difficulty or error caused by poor sight is avoided.