Eyesight examination device for ophthalmology department

Abstract

The invention discloses an ophthalmology department vision examination device, and relates to the technical field of vision examination, the ophthalmology department vision examination device comprises a box body, the front side of the box body is rotatably provided with rotary discs from top to bottom, the sizes of the rotary discs in the same row are the same, and the multiple rotary discs are provided with E-shaped icons; rotating chain wheels are fixedly installed on the sides, away from the E-shaped icons, of the multiple rotating discs, a driving assembly is installed in the box body, the driving assembly is connected with a seat through an oil duct, the driving assembly is used for driving the multiple rotating chain wheels to rotate, then the E-shaped icons on the rotating discs are rotated, and one side of the seat is connected with a shading plate through a wire. The passive piston is driven through the hydraulic system, the chain is driven to enable part of the rotating disc to rotate by 90 degrees or multiple of 90 degrees randomly, and E-shaped icons on the rotating disc are changed irregularly. According to the randomized sighting mark display mode, the behavior that students make opportunities and skills by photographing and recording the positions and rules of the sighting marks is effectively eradicated, and it is ensured that the vision examination result is real and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of vision examination, and particularly to an ophthalmic vision examination device. Background Art

[0002] During the process of schools organizing students for vision examinations, many problems have emerged in the existing vision examination boxes, seriously affecting the accuracy and hygienic safety of the examination results. Currently, most vision examination boxes used in schools adopt a fixed arrangement and display mode of visual targets. When students are queuing up waiting for the examination, some students often use mobile phones to take pictures of the visual targets in the vision examination box. Due to the lack of randomness in the arrangement of visual targets, students with better memory can, based on the photographed content and according to the position information of the visual targets, know in advance the opening direction of the E character, and "cheat" during the examination process, resulting in a serious distortion of the vision examination results and being unable to truly reflect the students' vision conditions. This not only interferes with the scientific assessment of students' vision health by schools but may also delay the timely intervention and treatment of students with vision problems.

[0003] In terms of hygienic safety, there are significant potential hazards in the use of the light-shielding plates equipped in the existing vision examination boxes. Each time a vision examination is conducted, the light-shielding plate needs to be in close contact with the eyes of the person to be examined. However, there are significant differences in the amount of oil secreted by the eyes of different individuals. During continuous examinations, a large amount of oil will continuously stain the light-shielding plate, forming dirt residues. These residual oils not only provide a breeding ground for bacteria but may also carry eye pathogens. When the next person to be examined uses the light-shielding plate, it is extremely easy to cause eye infections through indirect contact. Especially in an environment where students are densely populated and their hygienic awareness varies, it greatly increases the risk of cross-transmission of eye diseases and seriously threatens the eye health of students.

[0004] In addition, the existing vision examination boxes cannot effectively ensure that a proper distance is maintained between the eyes of the person to be examined and the light-shielding plate. During the vision examination process, maintaining a distance of 1 - 2 centimeters between the eyes and the light-shielding plate is one of the important conditions to ensure the accuracy of the examination results. However, in actual operation, due to the lack of professional guidance, students often find it difficult to consciously maintain this distance. The distance deviation will cause changes in factors such as light refraction and viewing angle, thereby affecting the accuracy of the vision examination. And since the examiners need to perform multiple tasks such as operating the examination equipment and recording data at the same time, it is difficult to always pay attention to the distance between each student's eyes and the light-shielding plate and correct the students' incorrect postures in a timely manner, further increasing the error of the examination results. To sum up, the existing vision examination boxes have serious deficiencies in terms of accuracy, hygienic safety, and examination standardization. There is an urgent need for a new type of vision examination device that can effectively prevent visual targets from being recorded in advance, ensure the cleanliness and hygiene of the light-shielding plate, and ensure the standardization of the examination distance. For this reason, we propose an ophthalmic vision examination device. Summary of the Invention

[0005] The object of the present invention is to provide an ophthalmic vision testing device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ophthalmic vision examination device, comprising: a box body, a turntable is rotatably installed on the front side of the box body from top to bottom, the turntables in the same row are of the same size, and a number of the turntables are provided with E-shaped icons, a rotating sprocket is fixedly installed on the side of the turntable away from the E-shaped icon, a driving component is installed inside the box body, the driving component is connected to a seat through an oil channel, the driving component is used to drive a number of rotating sprockets to rotate, and then rotate the E-shaped icon on the turntable, a visor is connected to one side of the seat through a wire, a pad is magnetically attracted to one side of the visor, and the seat faces the box A bracket is installed on one side of the body, and a placement groove for storing the sunshade is opened on the top of the bracket. A switching assembly is installed between the bracket and the seat, and the switching assembly is used to replace the pad. The driving assembly includes a chain and a U-shaped connecting rod. Chains are drivingly connected between several rows of rotating sprockets. The middle parts of several chains are fixedly connected to the U-shaped connecting rod, one end of the U-shaped connecting rod is fixedly connected to a passive piston, a support plate is fixedly connected inside the box body, and connecting cylinders corresponding to the U-shaped connecting rod are respectively fixed on one side of the support plate, and the passive piston is slidably installed in the connecting cylinder, and one end of several connecting cylinders is connected to a main pipeline, and the main pipeline is connected to the oil pipe.

[0007] Preferably, spherical blocking blocks are rotatably installed at the connection points between several of the connecting cylinders and the main pipelines, a through hole corresponding to the connecting cylinder is opened in the middle of the spherical blocking blocks, a connecting column is fixedly connected to the top of the spherical blocking blocks, the connecting column extends out of the connecting cylinder and the main pipeline, an opening and closing gear is fixedly installed at the connection point, an opening and closing plate is slidably installed on one side of the support plate, a rack corresponding to the opening and closing plate is installed on the side of the opening and closing plate close to the opening and closing gear, and several of the racks are respectively meshed and connected with the corresponding opening and closing gears.

[0008] Preferably, an oil barrel is fixedly installed inside the seat, an active piston is slidably installed inside the oil barrel, a tension spring is provided between the active piston and the top of the oil barrel, the bottom of the oil barrel is connected with the oil channel, and hydraulic oil is filled inside the oil barrel, oil pipe, main pipeline and connecting cylinder, and a seat plate is fixedly installed on the top of the active piston.

[0009] Preferably, the switching component includes a three-pronged lever. Inside the bracket, a feeding bin and a discharging bin are respectively provided. The tops of the feeding bin and the discharging bin are connected through a groove. The top end of the feeding bin is connected to the placing groove. Elastic pieces are fixedly connected at equal intervals inside the placing groove. A three-pronged lever is rotatably installed inside the groove. An extension rod is fixedly installed in the middle of the three-pronged lever. A driven belt gear is fixedly installed at the bottom end of the extension rod. A driving belt gear is rotatably installed inside the seat. The driving belt gear and the driven belt gear are connected by belt drive. A worm gear is installed at the top end of the driving belt gear. A worm is rotatably connected inside the seat. The worm gear is meshed with the worm. A switching rack is fixedly installed at the bottom end of the seat plate. A switching gear is fixedly installed at one end of the worm. The switching rack and the switching gear are meshed with each other.

[0010] Preferably, a top rod is fixedly connected to the top end of the driving belt gear. A bevel gear is fixedly installed at the top end of the top rod. The middle part of the worm gear is designed to be hollow. The end of the top rod extends into the worm gear. Bevel rods are rotatably installed at equal intervals inside the worm gear. A meshing spring is installed between the bevel rod and the worm gear, and the end of the bevel rod is always in contact with the outer wall of the bevel gear.

[0011] Preferably, the gear ratio of the driving belt gear to the driven belt gear is 4:1. The worm gear and the driving belt gear rotate 30 degrees each time, and the driven belt gear rotates 120 degrees. The angle between the three-pronged levers is 120 degrees.

[0012] Preferably, the lengths and pitches of several of the racks are different. An L-shaped pull rod is fixedly installed on one side of the opening and closing plate. A return spring is installed between the L-shaped pull rod and the box body. One end of the L-shaped pull rod extends out of the box body. A trapezoidal block is slidably connected to one side of the box body. A stepped groove is provided on the inclined surface of the trapezoidal block. The included angle between the stepped grooves is greater than 90 degrees, and one side of the stepped groove is always parallel to one end of the L-shaped pull rod.

[0013] Preferably, stoppers are fixedly installed at different positions inside several of the connecting cylinders. When the corresponding passive piston moves to the stopper, the chain drives the rotating sprocket of that row to rotate by a multiple of 90 degrees.

[0014] Preferably, a feeding spring is fixedly connected inside the feeding bin. A top plate is slidably connected inside the feeding bin. The top plate is fixedly connected to the feeding spring. A discharge slot for discharging is provided at the bottom end of the discharging bin.

[0015] Preferably, the light-shielding plate is divided into a ring and a rod. The placing groove is in the shape of a lollipop. The rod end of the light-shielding plate is made of iron. Capacitive sensors are fixedly installed on both sides of the ring of the light-shielding plate. An electromagnet is installed at the rod end where the placing groove is located. The cushion plate on the light-shielding plate is made of silica gel. The capacitive sensors are electrically connected to the lamp body inside the box body.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In terms of improving the accuracy of the examination, the device has completely solved the problem that the visual targets are easily recorded in advance through a unique randomization operation mechanism. The examiner randomly slides the trapezoidal block, and the rack with different lengths and pitches drives the opening and closing gears, causing the spherical plug to rotate randomly, realizing the random combination of the on-off of the connecting cylinders in different rows and the main pipeline. After the examiner sits down, the hydraulic system drives the passive piston, driving the chain to randomly rotate a part of the turntable by 90 degrees or multiples thereof, making the E-shaped icons on the turntable show irregular changes. This randomized visual target display method effectively prevents students from taking pictures to record the positions and rules of the visual targets for opportunistic behavior, ensuring the authenticity and reliability of the vision examination results, providing strong support for schools to accurately evaluate the vision health status of students, and avoiding delaying the timely intervention and treatment of students with vision problems due to inaccurate examination results.

[0018] In ensuring hygiene and safety, the automatic switching pad mechanism of the device plays a key role. Whenever the examiner sits down, the seat plate presses down to trigger the operation of the switching component. The three-pronged rod rotates 120 degrees, pushing the new pad at the top of the feeding bin into the placement slot to replace the original pad, effectively isolating the direct contact between the face and the light-shielding plate. This design fundamentally avoids the residual eye grease of different examinees on the light-shielding plate, preventing the grease from becoming a breeding ground for bacteria and a carrier for pathogen transmission, greatly reducing the risk of cross-infection of eye diseases in the crowded school environment, providing a clean and safe examination environment for students, and effectively protecting the eye health of students.

[0019] In assisting vision detection, the capacitive sensors on both sides of the light-shielding plate play an important role. When the examiner holds the light-shielding plate close to the eyes for examination, the capacitive sensors come into contact with the human body. After detecting the human body signal, they send instructions to the internal control circuit of the box body, causing the box body to light up, providing suitable lighting conditions for vision detection. Only when the box body is lit can the examinee clearly identify the E-shaped icons on the turntable, so as to perform accurate vision detection. This design can not only provide the necessary light for vision detection, but also intelligently control the lighting through human body induction, avoiding unnecessary energy consumption. Description of the Drawings

[0020] Figure 1 is one of the overall structural schematic diagrams of the present invention;

[0021] Figure 2 is the second of the overall structural schematic diagrams of the present invention from another perspective;

[0022] Figure 3 is one of the internal device structural schematic diagrams of the box body of the present invention;

[0023] Figure 4 is the second of the partial cross-sectional structural schematic diagrams inside the box body of the present invention;

[0024] Figure 5 It is the third schematic diagram of the partial sectional view of the box body of the present invention;

[0025] Figure 6 It is the schematic diagram of the opening and closing plate structure of the present invention

[0026] Figure 7 It is one of the schematic diagrams of the seat structure of the present invention;

[0027] Figure 8 It is the second schematic diagram of the partial sectional view of the seat structure of the present invention;

[0028] Figure 9 It is the third schematic diagram of the partial sectional view of the seat structure of the present invention;

[0029] Figure 10 It is one of the schematic diagrams of the switching component structure of the present invention;

[0030] Figure 11 It is the second schematic diagram of the switching component structure of the present invention;

[0031] Figure 12 It is the schematic diagram of the internal structure of the worm wheel of the present invention;

[0032] Figure 13 It is the schematic diagram of the side sectional view structure of the oil barrel of the present invention;

[0033] Figure 14 It is Figure 5 The enlarged view at position A in

[0034] Figure 15 It is Figure 8 The enlarged view at position B in

[0035] Figure 16 It is Figure 9 The enlarged view at position C in

[0036] In the figure: 1. Box body; 2. Turntable; 3. Rotating sprocket; 4. Seat; 5. Bracket; 6. Light-shielding plate; 7. Placing groove; 8. Chain; 9. U-shaped connecting rod; 10. Passive piston; 11. Support plate; 12. Connecting cylinder; 13. Main pipeline; 21. Spherical plug; 22. Through hole; 23. Opening and closing gear; 24. Opening and closing plate; 25. Rack; 31. Oil barrel; 32. Active piston; 33. Tension spring; 34. Seat plate; 41. Feeding bin; 42. Discharging bin; 43. Groove; 44. Elastic sheet; 45. Trident rod; 46. Extension rod; 47. Driven belt gear; 48. Driving belt gear; 49. Worm wheel; 410. Worm; 411. Switching rack; 412. Switching gear; 51. Thrust rod; 52. Helical gear; 53. Inclined rod; 71. L-shaped pull rod; 72. Return spring; 73. Trapezoidal block; 74. Step groove; 81. Stopper; 91. Feeding spring; 92. Top plate. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-16 As shown, an ophthalmic vision examination device comprises a box body 1, on the front side of which turntables 2 are rotatably installed from top to bottom, the box body 1 is an existing vision examination box, the turntables 2 in the same row are of the same size, and a number of the turntables 2 are provided with E-shaped icons, a number of the turntables 2 are fixedly installed with rotating sprockets 3 on the side away from the E-shaped icons, a driving assembly is installed inside the box body 1, the driving assembly is connected to a seat 4 through an oil channel, the driving assembly is used to drive the number of rotating sprockets 3 to rotate, and then rotate the E-shaped icons on the turntable 2, a visor 6 is connected to one side of the seat 4 through a wire, a pad is magnetically attracted to one side of the visor 6, a bracket 5 is installed on the side of the seat 4 facing the box body 1, a placement slot 7 for storing the visor 6 is opened on the top of the bracket 5, and a cutting plate is installed between the bracket 5 and the seat 4. A replacement component, a switching component is used to replace the pad, the driving component includes a chain 8 and a U-shaped connecting rod 9, and the chain 8 is drivingly connected between several rows of rotating sprockets 3. The middle part of several of the chains 8 is fixedly connected to the U-shaped connecting rod 9, and one end of the U-shaped connecting rod 9 is fixedly connected to a passive piston 10. A support plate 11 is fixedly connected inside the box body 1, and one side of the support plate 11 is respectively fixed with a connecting cylinder 12 corresponding to the U-shaped connecting rod 9, and the passive piston 10 is slidably installed in the connecting cylinder 12, and one end of several of the connecting cylinders 12 is connected to a main pipeline 13, and the main pipeline 13 is connected to the oil pipe, and different positions inside several of the connecting cylinders 12 are fixedly installed with stoppers 81, and the corresponding passive piston 10 moves to the stopper 81, where the chain 8 drives the rotating sprocket 3 of this row to rotate a multiple of 90 degrees;

[0039] The person to be inspected walks to the seat 4 and sits down. As the weight of the person to be inspected is applied to the seat plate 34, the seat plate 34 moves downward, driving the active piston 32 to slide in the oil barrel 31. At this time, the tension spring 33 at the top of the oil barrel 31 is stretched to prepare for the subsequent displacement of the active piston 32.

[0040] The bottom end of the oil barrel 31 is connected to the oil channel, and hydraulic oil is filled in the oil barrel 31, the oil pipe, the main pipeline 13 and the connecting cylinder 12. When the active piston 32 moves downward, the hydraulic oil in the oil barrel 31 is squeezed and flows into the main pipeline 13 through the oil channel. The hydraulic oil in the main pipeline 13 then enters the connecting cylinder 12 whose passage was randomly opened before.

[0041] The hydraulic oil entering the connecting cylinder 12 pushes the passive piston 10 to slide within the connecting cylinder 12. The passive piston 10 is fixedly connected to the U-shaped connecting rod 9, and the other end of the U-shaped connecting rod 9 is fixedly connected to the middle of the chain 8. The movement of the passive piston 10 drives the U-shaped connecting rod 9, thereby pulling the chain 8.

[0042] A number of rotating sprockets 3 are driven by the chain 8, and the pulling of the chain 8 causes some of the rotating sprockets 3 connected thereto to rotate. Due to the stoppers 81 fixed at different positions within the connecting cylinder 12, when the passive piston 10 moves to the position of the stopper 81 and stops, at this time, the corresponding chain 8 drives the rotating sprocket 3 to rotate by a multiple of 90 degrees. Also, because of the randomness of the on-off of the oil circuit before, some of the turntables 2 in different rows rotate and some do not rotate, and the rotation angles also show random multiples of 90 degrees due to the different positions of the stoppers 81. Finally, the irregular rotation of the E-shaped icons on the turntable 2 is realized, effectively preventing the examinee from memorizing the direction of the visual targets in advance.

[0043] At the connection between a number of the connecting cylinders 12 and the main pipeline 13, spherical stoppers 21 are rotatably installed. A through hole 22 corresponding to the connecting cylinder 12 is provided in the middle of the spherical stopper 21. A connecting column is fixedly connected to the top end of the spherical stopper 21, and a switching gear 23 is fixedly installed at the connection where the connecting column extends out of the connection between the connecting cylinder 12 and the main pipeline 13. A switching plate 24 is slidably installed on one side of the support plate 11, and a corresponding rack 25 is installed on the side of the switching plate 24 close to the switching gear 23. A number of the racks 25 are respectively meshed and connected with the corresponding switching gears 23. An oil barrel 31 is fixedly installed inside the seat 4, and a driving piston 32 is slidably installed inside the oil barrel 31. A tension spring 33 is provided between the driving piston 32 and the top end inside the oil barrel 31. The bottom end of the oil barrel 31 is communicated with the oil passage, and the inside of the oil barrel 31, the oil pipe, the main pipeline 13 and the connecting cylinder 12 are filled with hydraulic oil. A seat plate 34 is fixedly installed at the top end of the driving piston 32. The lengths and pitches of a number of the racks 25 are all different. An L-shaped pull rod 71 is fixedly installed on one side of the switching plate 24. A return spring 72 is installed between the L-shaped pull rod 71 and the box body 1. One end of the L-shaped pull rod 71 extends out of the box body 1. A trapezoidal block 73 is slidably connected to one side of the box body 1. A stepped groove 74 is provided on the inclined surface of the trapezoidal block 73, and the included angle between the stepped grooves 74 is greater than 90 degrees, and one side of the stepped groove 74 is always parallel to one end of the L-shaped pull rod 71;

[0044] The inspector stands on the side of the box body 1 and randomly slides the trapezoidal block 73. The included angle between the stepped grooves 74 provided on the inclined surface of the trapezoidal block 73 is greater than 90 degrees, and one side of the stepped groove 74 is always parallel to one end of the L-shaped pull rod 71. During the sliding process, under the action of the return spring 72, one end of the L-shaped pull rod 71 will randomly be inserted into a certain stepped groove 74, thereby fixing the L-shaped pull rod 71 at a random position.

[0045] After the L-shaped pull rod 71 is fixed, it drives the opening and closing plate 24 connected thereto to move. Since the opening and closing plate 24 is installed on the side close to the opening and closing gear 23, the lengths and pitches of the racks 25 are different, the random movement of the opening and closing plate 24 will cause different racks 25 to drive the corresponding opening and closing gears 23 to randomly rotate at different angles.

[0046] The opening and closing gear 23 is connected to the spherical block 21 through a connecting column, and the rotation of the opening and closing gear 23 drives the spherical block 21 to rotate synchronously. The through hole 22 in the middle of the spherical block 21 corresponds to the connecting cylinder 12. When the spherical block 21 rotates randomly, the through holes 22 between some connecting cylinders 12 and the main pipeline 13 may be aligned, so that the hydraulic oil can pass through these connecting cylinders 12; while the through holes 22 of some connecting cylinders 12 are staggered with the main pipeline 13, and the oil circuit is in a blocked state. In this way, the on-off combination of different rows of connecting cylinders 12 and the main pipeline 13 is randomly realized, creating conditions for the subsequent irregular rotation of the turntable.

[0047] The switching assembly includes a tripod 45, and a loading bin 41 and a discharging bin 42 are respectively provided inside the bracket 5. The tops of the loading bin 41 and the discharging bin 42 are connected through a groove 43. The top of the loading bin 41 is connected to the placement groove 7. The placement groove 7 is fixedly connected with spring pieces 44 at equal intervals. A tripod 45 is rotatably installed inside the groove 43. An extension rod 46 is fixedly installed in the middle of the tripod 45. A driven belt gear 47 is fixedly installed at the bottom end of the extension rod 46. A driving belt gear 48 is rotatably installed inside the seat 4. The driving belt gear 48 and the driven belt gear 47 are connected through a belt transmission. A worm gear 49 is installed at the top of the driving belt gear 48. A worm 410 is rotatably connected inside the seat 4. The worm gear 49 is meshed with the worm 410. A switching rack 411 is fixedly installed at the bottom end of the seat plate 34. A switching gear 412 is fixedly installed at one end of the worm 410. 1 is meshed and connected with the switching gear 412, the top of the driving belt gear 48 is fixedly connected with a push rod 51, and a bevel gear 52 is fixedly installed on the top of the push rod 51. The middle part of the worm gear 49 is hollow, and the end of the push rod 51 extends into the inside of the worm gear 49. An inclined rod 53 is equidistantly installed inside the worm gear 49. A meshing spring is installed between the inclined rod 53 and the worm gear 49, and the end of the inclined rod 53 is always in contact with the outer wall of the bevel gear 52. The gear ratio of the driving belt gear 48 to the driven belt gear 47 is 4:1. The worm gear 49 and the driving belt gear 48 rotate 30 degrees at a time, and the driven belt gear 47 rotates 120 degrees. The angle between the tripod rods 45 is 120 degrees. A loading spring 91 is fixedly connected to the upper bin 41, and a top plate 92 is slidably connected to the upper bin 41. The top plate 92 and the loading spring 91 are fixedly connected. A discharge trough for discharging is provided at the bottom of the discharge bin 42.

[0048] When the person to be inspected sits down and presses down the seat plate 34, the switching rack 411 fixed to the bottom end of the seat plate 34 also moves downward. The switching rack 411 meshes with the switching gear 412 at one end of the worm 410. The downward movement of the switching rack 411 drives the rotation of the switching gear 412, thereby causing the worm 410 to rotate.

[0049] The worm 410 meshes with the worm wheel 49. The rotation of the worm 410 drives the rotation of the worm wheel 49. The worm wheel 49 is connected to the driving belt gear 48, and the driving belt gear 48 and the driven belt gear 47 are driven by a belt. Since the gear ratio of the driving belt gear 48 to the driven belt gear 47 is 4:1, and since the switching rack 411 can only drive the worm wheel 49 and the driving belt gear 48 to rotate 30 degrees once when it descends, the driven belt gear 47 will rotate 120 degrees.

[0050] The driven belt gear 47 is connected to the three-pronged lever 45 through the extension rod 46. When the driven belt gear 47 rotates 120 degrees, it drives the three-pronged lever 45 to rotate 120 degrees in the groove 43. The loading spring 91 in the loading bin 41 is connected to the top plate 92, and the top plate 92 pushes the backing plate upward under the action of the spring. When the three-pronged lever 45 rotates 120 degrees, it pushes the backing plate at the top of the loading bin 41 into the placement groove 7. The elastic piece 44 in the placement groove 7 holds the new backing plate to prevent the new backing plate from popping out of the placement groove 7 without the light-shielding plate 6 inside the placement groove 7. When the rod end of the light-shielding plate 6 is placed in the placement groove 7, the electromagnet adsorbs the rod end of the iron material light-shielding plate 6, causing the original elastic piece 44 to contract. The original backing plate in the placement groove 7 is pushed by the three-pronged lever 45 and enters the discharge bin 42 through the groove 43 and is discharged from the discharge slot at the bottom of the discharge bin 42;

[0051] The reason for setting up the backing plate replacement mechanism is that when the person to be inspected uses the light-shielding plate 6 for vision inspection, the face will inevitably come into contact with the light-shielding plate 6, and grease will remain on the light-shielding plate. The residue of grease not only affects the subsequent use experience of the person to be inspected, but may also breed bacteria and affect eye health. By replacing the backing plate in time, the new backing plate can effectively isolate the direct contact between the face and the light-shielding plate, avoid the problem of grease residue, and ensure that a clean and hygienic use environment can be provided for the person to be inspected every time.

[0052] The ejector rod 51 and the helical gear 52 at the top of the driving belt gear 48, the inclined rod 53 inside the worm wheel 49 and the meshing spring form a one-way transmission structure. When the driving belt gear 48 rotates forward and the person to be inspected sits down and presses down the seat plate, the helical gear 52 pushes the inclined rod 53 to drive the rotation of the worm wheel 49; when it rotates backward and the person to be inspected gets up, the inclined rod 53 contracts under the action of the meshing spring and does not drive the rotation of the worm wheel 49, ensuring that the backing plate is only switched when the person to be inspected sits down, and avoiding repeated or incorrect operations.

[0053] The light shield 6 is divided into a circular ring and a rod. The placement groove 7 is in the shape of a lollipop. The rod end of the light shield 6 is made of iron. Capacitive sensors are fixedly installed on both sides of the circular ring of the light shield 6. An electromagnet is installed at the rod end of the placement groove 7. The backing plate on the light shield 6 is made of silica gel. The capacitive sensors are electrically connected to the lamp body inside the box 1;

[0054] The light shield 6 consists of a circular ring and a rod. The placement groove 7 is in the shape of a lollipop. The rod end of the light shield 6 is made of iron. An electromagnet is installed at the rod end of the placement groove 7. The electromagnet is used to fix the light shield 6 and provide a thrust force to make the elastic piece 44 contract. When the person to be examined conducts a vision test, the light shield 6 can be picked up from the placement groove 7, and it can be easily separated using the iron material at the rod end.

[0055] Hold the light shield 6 and block the circular ring in front of one eye for monocular vision testing. The capacitive sensors on both sides of the circular ring of the light shield 6 not only sense the approach of the human body to control the lamp body switch, but also play an important role in energy conservation and extending the service life of the lamp tube. When the device is in an idle state, that is, when there is no person to be examined using the light shield 6, the capacitive sensors cannot sense the human body signal. At this time, a power-off signal will be sent to the internal control circuit of the box 1, and the control circuit will immediately cut off the power supply of the lamp tube, avoiding the continuous operation of the lamp tube when the device is not in use, thereby reducing power waste and at the same time reducing the working duration of the lamp tube, effectively extending the service life of the lamp tube.

[0056] When the capacitive sensor touches the human body, it sends a signal to the internal control circuit of the box 1 to light up the lamp body to provide appropriate lighting; when the light shield 6 is removed, the capacitive sensor cannot sense the human body signal, and the control lamp body goes out to save energy.

[0057] Working principle:

[0058] I. Random operation: Control the on / off of the oil circuit

[0059] The person to be examined stands on the side of the box 1 and randomly slides the trapezoidal block 73; the included angle between the stepped grooves 74 opened on the inclined surface of the trapezoidal block 73 is greater than 90 degrees, and one side of the stepped groove 74 is always parallel to one end of the L-shaped pull rod 71; during the sliding process, under the action of the return spring 72, one end of the L-shaped pull rod 71 will randomly embed into a certain stepped groove 74, thereby fixing the L-shaped pull rod 71 at a random position;

[0060] After the L-shaped pull rod 71 is fixed, it drives the opening and closing plate 24 connected to it to move; since the lengths and pitches of several racks 25 installed on the side of the opening and closing plate 24 close to the opening and closing gear 23 are different, the random movement of the opening and closing plate 24 will cause different racks 25 to drive the corresponding opening and closing gears 23 to rotate randomly by different angles;

[0061] The opening and closing gear 23 is connected to the spherical block 21 through a connecting column, and the rotation of the opening and closing gear 23 drives the spherical block 21 to rotate synchronously; the through hole 22 in the middle of the spherical block 21 corresponds to the connecting tube 12. When the spherical block 21 rotates randomly, the through holes 22 between some connecting tubes 12 and the main pipeline 13 may be aligned, so that the hydraulic oil can pass through these connecting tubes 12; while the through holes 22 of some connecting tubes 12 are staggered with the main pipeline 13, and the oil circuit is in a blocked state; thus, the on-off combination of different rows of connecting tubes 12 and the main pipeline 13 is randomly realized, creating conditions for the subsequent irregular rotation of the turntable;

[0062] 2. Inspection process: Random hydraulic drive turntable rotation

[0063] After completing the above-mentioned random oil circuit on-off setting, the person to be inspected walks to the seat 4 and sits down; as the weight of the person to be inspected is applied to the seat plate 34, the seat plate 34 moves downward, driving the active piston 32 to slide in the oil barrel 31. At this time, the tension spring 33 at the top of the oil barrel 31 is stretched to prepare for the subsequent displacement of the active piston 32;

[0064] The bottom end of the oil barrel 31 is connected to the oil channel, and hydraulic oil is filled in the oil barrel 31, the oil pipe, the main pipeline 13 and the connecting cylinder 12; when the active piston 32 moves downward, the hydraulic oil in the oil barrel 31 is squeezed and flows into the main pipeline 13 through the oil channel; the hydraulic oil in the main pipeline 13 then enters the connecting cylinder 12 whose passage was randomly opened before;

[0065] The hydraulic oil entering the connecting cylinder 12 pushes the passive piston 10 to slide in the connecting cylinder 12; the passive piston 10 is fixedly connected to the U-shaped connecting rod 9, and the other end of the U-shaped connecting rod 9 is fixed to the middle of the chain 8. The movement of the passive piston 10 drives the U-shaped connecting rod 9, and then pulls the chain 8;

[0066] Several rows of rotating sprockets 3 are driven by chains 8, and the pulling of chains 8 causes some of the rotating sprockets 3 connected thereto to rotate; due to the blocks 81 fixed at different positions in the connecting cylinder 12, when the passive piston 10 moves to the block 81 and stops, the corresponding chain 8 drives the rotating sprocket 3 to rotate by a multiple of 90 degrees; and because of the randomness of the previous oil circuit on and off, some of the turntables 2 in different rows rotate and some do not rotate, and the rotation angle also presents a random multiple of 90 degrees due to the different positions of the block 81, and finally realizes the irregular rotation of the E-shaped icon on the turntable 2, effectively preventing the inspected person from memorizing the direction of the sight mark in advance;

[0067] 3. Synchronous work: Switching pads

[0068] When the person to be inspected sits down and presses down the seat plate 34, the switching rack 411 fixed to the bottom end of the seat plate 34 also moves downward; the switching rack 411 meshes with the switching gear 412 at one end of the worm 410, and the downward movement of the switching rack 411 drives the switching gear 412 to rotate, thereby rotating the worm 410;

[0069] The worm 410 meshes with the worm gear 49, and the rotation of the worm 410 drives the worm gear 49 to rotate; the worm gear 49 is connected to the driving belt gear 48, and the driving belt gear 48 and the driven belt gear 47 are driven by a belt; since the gear ratio of the driving belt gear 48 to the driven belt gear 47 is 4:1, and since the switching rack 411 can only drive the worm gear 49 and the driving belt gear 48 to rotate 30 degrees once when it descends, the driven belt gear 47 will rotate 120 degrees;

[0070] The driven belt gear 47 is connected to the three-pronged lever 45 through the extension rod 46. When the driven belt gear 47 rotates 120 degrees, it drives the three-pronged lever 45 to rotate 120 degrees in the groove 43; the feeding spring 91 in the feeding bin 41 is connected to the top plate 92, and the top plate 92 pushes the backing plate upward under the action of the spring; when the three-pronged lever 45 rotates 120 degrees, the backing plate at the top of the feeding bin 41 is pushed into the placement groove 7, and the elastic piece 44 in the placement groove 7 catches the new backing plate to prevent the new backing plate without the light-shielding plate 6 from popping out of the placement groove 7 inside. When the rod end of the light-shielding plate 6 is placed in the placement groove 7, the electromagnet adsorbs the rod end of the iron material light-shielding plate 6, causing the original elastic piece 44 to contract; the original backing plate in the placement groove 7 is pushed by the three-pronged lever 45, enters the discharge bin 42 through the groove 43, and is discharged from the discharge slot at the bottom of the discharge bin 42;

[0071] The reason for setting up the backing plate replacement mechanism is that when the person to be inspected uses the light-shielding plate 6 for vision inspection, the face will inevitably come into contact with the light-shielding plate 6, and grease will remain on the light-shielding plate; the remaining grease not only affects the subsequent use experience of the person to be inspected, but may also breed bacteria and affect eye health; by replacing the backing plate in time, the new backing plate can effectively isolate the direct contact between the face and the light-shielding plate, avoid the problem of grease residue, and ensure that a clean and hygienic use environment can be provided for the person to be inspected every time;

[0072] The ejector rod 51 and the helical gear 52 at the top of the driving belt gear 48, the inclined rod 53 inside the worm gear 49 and the meshing spring form a one-way transmission structure; when the driving belt gear 48 rotates forward and the person to be inspected sits down and presses down the seat plate, the helical gear 52 pushes the inclined rod 53 to drive the worm gear 49 to rotate; when rotating in the reverse direction when the person to be inspected gets up, the inclined rod 53 contracts under the action of the meshing spring and does not drive the worm gear 49 to rotate, ensuring that the backing plate is only switched when the person to be inspected sits down, and avoiding repeated or misoperations;

[0073] IV. Auxiliary function: Use of the light-shielding plate

[0074] The light shield 6 is composed of a circular ring and a rod. The placement groove 7 is in the shape of a lollipop. The end of the rod of the light shield 6 is made of a sticking material. An electromagnet is installed at the end of the rod of the placement groove 7. The electromagnet is used to fix the light shield 6 and provide a thrust force to make the elastic piece 44 contract. When the person to be examined conducts a vision test, the light shield 6 can be picked up from the placement groove 7 and easily separated by using the sticking material at the end of the rod.

[0075] Hold the light shield 6 and block the circular ring in front of one eye for monocular vision test. The capacitance sensors on both sides of the circular ring of the light shield 6 are not only used to sense the approach of the human body to control the lamp body switch, but also play an important role in energy conservation and extending the service life of the lamp tube. When the device is in an idle state, that is, when there is no person to be examined using the light shield 6, the capacitance sensor cannot sense the human body signal. At this time, it will send a power-off signal to the internal control circuit of the box body 1, and the control circuit will immediately cut off the power supply of the lamp tube, avoiding the continuous operation of the lamp tube when the device is not in use, thereby reducing power waste and at the same time reducing the working hours of the lamp tube, effectively extending the service life of the lamp tube.

[0076] When the capacitance sensor contacts the human body, it sends a signal to the internal control circuit of the box body 1 to light up the lamp body to provide appropriate illumination. When the light shield 6 is removed, the capacitance sensor cannot sense the human body signal, and the control lamp body goes out to save energy.

[0077] Through the above series of randomized operations and the coordinated work of components, the ophthalmic vision test device realizes the irregular change of the rotary visual acuity chart, improving the accuracy and reliability of the vision test.

[0078] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0079] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ophthalmic vision examination device, comprising: The box (1) is characterized in that: The front of the box (1) is rotatably mounted with turntables (2) from top to bottom. The turntables (2) in the same row are of the same size, and a plurality of the turntables (2) are provided with E-shaped icons. A rotating sprocket (3) is fixedly mounted on the side of the turntables (2) away from the E-shaped icons. A driving assembly is mounted inside the box (1). The driving assembly is connected to a seat (4) through an oil passage. The driving assembly is used to drive the plurality of rotating sprockets (3) to rotate, thereby rotating the E-shaped icons on the turntable (2). A sunshade (6) is connected to one side of the seat (4) through a wire. A pad is magnetically attracted to one side of the sunshade (6). A bracket (5) is mounted on the side of the seat (4) facing the box (1). A placement slot (7) for storing the sunshade (6) is provided at the top of the bracket (5). A switching assembly is mounted between the bracket (5) and the seat (4). The switching assembly is used to replace the pad. The driving assembly comprises a chain (8) and a U-shaped connecting rod (9), and the chains (8) are drivingly connected between the rows of rotating sprockets (3). The middle parts of the chains (8) are fixedly connected to the U-shaped connecting rod (9), and one end of the U-shaped connecting rod (9) is fixedly connected to a passive piston (10). A support plate (11) is fixedly connected inside the box body (1), and one side of the support plate (11) is respectively fixed with a connecting cylinder (12) corresponding to the U-shaped connecting rod (9), and the passive piston (10) is slidably installed in the connecting cylinder (12), and one end of the connecting cylinder (12) is connected to a main pipeline (13), and the main pipeline (13) is connected to the oil pipe.

2. The ophthalmic vision examination device according to claim 1, characterized in that: A spherical block (21) is rotatably mounted at the connection points between the connecting tubes (12) and the main pipeline (13); a through hole (22) corresponding to the connecting tube (12) is opened in the middle of the spherical block (21); a connecting column is fixedly connected to the top of the spherical block (21); an opening and closing gear (23) is fixedly mounted at the connection point between the connecting column extending out of the connecting tube (12) and the main pipeline (13); an opening and closing plate (24) is slidably mounted on one side of the support plate (11); a rack (25) corresponding to the opening and closing gear (23) is mounted on the side of the opening and closing plate (24) close to the opening and closing gear (23); and a plurality of the racks (25) are respectively meshed and connected with the corresponding opening and closing gears (23).

3. An ophthalmic vision examination device according to claim 2, characterized in that: An oil barrel (31) is fixedly installed inside the seat (4), an active piston (32) is slidably installed inside the oil barrel (31), a tension spring (33) is provided between the active piston (32) and the top end of the oil barrel (31), the bottom end of the oil barrel (31) is connected to the oil channel, and hydraulic oil is filled inside the oil barrel (31), the oil pipe, the main pipeline (13) and the connecting cylinder (12), and a seat plate (34) is fixedly installed on the top end of the active piston (32).

4. An ophthalmic vision examination device according to claim 3, characterized in that: The switching component includes a three-pronged rod (45). Inside the bracket (5), a feeding bin (41) and a discharging bin (42) are respectively provided. The tops of the feeding bin (41) and the discharging bin (42) are connected through a groove (43). The top end of the feeding bin (41) is connected to the placement groove (7). Elastic pieces (44) are fixedly connected at equal intervals inside the placement groove (7). The three-pronged rod (45) is rotatably installed inside the groove (43). An extension rod (46) is fixedly installed in the middle of the three-pronged rod (45). A driven belt gear (47) is fixedly installed at the bottom end of the extension rod (46). A driving belt gear (48) is rotatably installed inside the seat (4). The driving belt gear (48) and the driven belt gear (47) are connected by belt drive. A worm gear (49) is installed at the top end of the driving belt gear (48). A worm (410) is rotatably connected inside the seat (4). The worm gear (49) and the worm (410) are meshed. A switching rack (411) is fixedly installed at the bottom end of the seat plate (34). A switching gear (412) is fixedly installed at one end of the worm (410). The switching rack (411) and the switching gear (412) are meshed with each other.

5. An ophthalmic vision examination device according to claim 4, characterized in that: A top rod (51) is fixedly connected to the top end of the driving belt gear (48). An inclined gear (52) is fixedly installed at the top end of the top rod (51). The middle part of the worm gear (49) is designed to be hollow. The end of the top rod (51) extends into the inside of the worm gear (49). Inclined rods (53) are rotatably installed at equal intervals inside the worm gear (49). A meshing spring is installed between the inclined rods (53) and the worm gear (49), and the end of the inclined rod (53) is always in contact with the outer wall of the inclined gear (52).

6. An ophthalmic vision examination device according to claim 4, characterized in that: The gear ratio of the driving belt gear (48) to the driven belt gear (47) is 4:

1. The worm gear (49) and the driving belt gear (48) rotate 30 degrees each time, and the driven belt gear (47) rotates 120 degrees. The angle between the three-pronged rods (45) is 120 degrees.

7. An ophthalmic vision examination device according to claim 2, characterized in that: The lengths and pitches of several of the racks (25) are different. An L-shaped pull rod (71) is fixedly installed on one side of the opening and closing plate (24). A return spring (72) is installed between the L-shaped pull rod (71) and the box body (1). One end of the L-shaped pull rod (71) extends out of the box body (1). A trapezoidal block (73) is slidably connected to one side of the box body (1). A stepped groove (74) is provided on the inclined surface of the trapezoidal block (73). The included angle between the stepped grooves (74) is greater than 90 degrees, and one side of the stepped groove (74) is always parallel to one end of the L-shaped pull rod (71).

8. An ophthalmic vision examination device according to claim 1, characterized in that: Blocks (81) are fixedly installed at different positions inside several of the connecting cylinders (12). When the corresponding passive piston (10) moves to the position of the block (81), the chain (8) drives the rotating sprocket (3) of this row to rotate by a multiple of 90 degrees.

9. An ophthalmic vision examination device according to claim 4, characterized in that: A feeding spring (91) is fixedly connected inside the feeding bin (41). A top plate (92) is slidably connected inside the feeding bin (41). The top plate (92) is fixedly connected to the feeding spring (91). A discharging groove for discharging is provided at the bottom end of the discharging bin (42).

10. An ophthalmic vision examination device according to claim 1, characterized in that: The light shield (6) is divided into a ring and a rod. The placement groove (7) is in the shape of a lollipop. The rod end of the light shield (6) is made of iron. Capacitive sensors are fixedly installed on both sides of the ring of the light shield (6). An electromagnet is installed at the rod end where the placement groove (7) is located. The backing plate on the light shield (6) is made of silicone. The capacitive sensors are electrically connected to the lamp body inside the box (1).

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