A fully automatic vision testing device

Abstract

This invention discloses a fully automatic vision testing device, relating to the field of vision testing technology. It includes a base shell in the shape of an open cylinder; a cover shell fitted onto the open end of the base shell, the base shell and the cover shell being fixedly connected by bolts, and one end of the outer wall of the cover shell having a through hole; a hanging ring located at one end of the outer wall of the cover shell; and a rotating frame located in the inner cavity. The rotating frame includes a central disc located on one side of the center of the inner cavity of the base shell. This invention, through the setting of a driving mechanism, allows the direction of the characters to be displayed randomly, preventing the memorization of the vision chart; the characters are made of paper, avoiding electronic display flicker that could affect the vision test; the testing process is automated, requiring no manual operation, avoiding human error, and can independently and accurately test vision; the testing process is standardized, with high accuracy and is not subject to human control; the control terminal records the testing process and results, which are displayed on an external monitor, facilitating networking and systematization.

Description

Technical Field

[0001] This invention relates to the field of vision testing technology, specifically a fully automatic vision testing device. Background Technology

[0002] A visual acuity chart is a graph used to test visual acuity. The chart primarily examines central visual acuity, specifically the visual acuity of the fovea in the macula of the retina. This provides a simple and quick preliminary understanding of visual function and is of significant importance for the clinical diagnosis and treatment of eye diseases. Visual acuity tests are generally divided into two categories: distance visual acuity and near visual acuity. Distance visual acuity tests typically use the international standard visual acuity chart, which consists of 12 rows of "E" symbols of varying sizes and opening directions. Measurements range from 0.1 to 1.5 (or from 4.0 to 5.2), and each row is numbered.

[0003] Vision charts are a tool we use to test eyesight in our daily lives. On existing vision charts, the direction of the letter "E" cannot be changed. People can memorize the direction of the "E" by reciting it, and some people memorize it beforehand to cheat on the test. Sometimes, someone else takes the test for them, making the test results subjective and unfair, and leading to some adverse consequences. If an LCD or CRT monitor is used to display the vision chart, flickering when the characters are small can affect the accuracy of vision measurement. Each vision test requires a dedicated person to point to the test characters, and then observe the direction pointed to by the person being tested. Some people may point several times, while others may point fewer times, potentially leading to errors due to human factors. One person cannot accurately test vision alone. Test results are recorded manually, which may result in errors and loss. Standardization is inconvenient, and the data cannot be directly integrated with computer systems, making systematization and networking difficult and scalable. Summary of the Invention

[0004] The purpose of this invention is to provide a fully automatic vision testing device in order to solve the problem of inconvenient operation of existing vision charts during use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fully automatic vision testing device, comprising a base shell in the shape of an open cylinder; a cover shell fitted onto the open end of the base shell, the base shell and the cover shell being fixedly connected by bolts, and one end of the outer wall of the cover shell having a through hole; a hanging ring disposed at one end of the outer wall of the cover shell; a rotating frame disposed in the inner cavity; the rotating frame comprising a central disk disposed on one side of the center of the inner cavity of the base shell, and multiple cantilever rods equidistantly surrounding the central disk, each of the multiple cantilever rods having a connecting shaft rotatably connected to its outer end; a rotating disk disposed at one end of the connecting shaft and near the cover shell; a groove being formed in the middle of the outer surface of the rotating disk, the character "E" being pasted in the groove; and a driving mechanism disposed between the base shell and the rotating frame, for driving both the rotating frame and the rotating disk to rotate, so that characters "E" of different sizes are randomly displayed.

[0006] As a further embodiment of the present invention: the driving mechanism includes: a first motor for driving the rotating frame to rotate; a second motor disposed at one end of the outer wall of the base shell, the output shaft of the second motor being rotatably connected to the outer wall of the base shell via a bearing; a gear disk fixedly connected to the output shaft end of the second motor and located in the inner cavity of the base shell; and a spur gear disposed at the other end of the connecting shaft and meshing with the gear disk.

[0007] As a further aspect of the present invention: the vision testing device further includes a blocking mechanism disposed between the rotating disk and the cover, for blocking the outer surface of the rotating disk that is moving and gradually approaching the through hole, so that the character "E" is always covered during the movement of the rotating disk.

[0008] As a further embodiment of the present invention: the shielding mechanism includes a fixed frame and an arc-shaped block. The fixed frame is fixedly connected to the inner wall of the cover and contacts the outer wall of the rotating disk. The arc-shaped block is slidably connected to the inside of the rotating disk and extends to the outer wall of the rotating disk. A displacement ring is fixedly connected to one end of the arc-shaped block inside the rotating disk. An annular groove is formed inside the rotating disk on the outer wall of the displacement ring. A partition is fixedly connected to the inner wall of the annular groove. The outer wall of the partition contacts the outer wall of the annular groove. A baffle extending to the inner wall of the groove is slidably connected inside the rotating disk. A limit block is fixedly connected to the outer wall of the baffle. A limit spring is connected between the limit block and the rotating disk. A vent hole is formed inside the rotating disk. One end of the vent hole extends to the outer wall of the rotating disk, and the other end extends to the inner wall of the annular groove. A plastic sheet is fixedly connected to the inner wall of the baffle.

[0009] As a further embodiment of the present invention: both the first motor and the second motor are connected to a control terminal via wires, the control terminal is electrically connected to an external power supply via wires, and the control terminal is connected to a keyboard and an external display respectively.

[0010] As a further embodiment of the present invention: the outer wall of the cover shell is provided with a threaded hole penetrating the cover shell, the outer wall of the base shell is provided with a connecting hole penetrating the base shell, and there are several sets of threaded holes and connecting holes, which are circumferentially distributed on the outer walls of the cover shell and the base shell, and the inner wall of the threaded hole is connected with a matching bolt.

[0011] As a further embodiment of the present invention: the rotating frame is composed of several rotating arms, the connecting shaft is located at one end of the rotating arm, the outer wall of the gear disk is provided with tooth grooves, and the tooth grooves of the gear disk mesh with the teeth of the spur gear.

[0012] As a further embodiment of the present invention: four arc-shaped blocks are provided and are distributed equidistantly around the circumference; one end of each arc-shaped block is provided with an arc-shaped surface; a sealing ring is provided at the position where the outer wall of the displacement ring meets the annular groove; and a sealing ring is provided at the position where the partition plate meets the outer wall of the displacement ring.

[0013] As a further embodiment of the present invention: the baffle is provided with an inclined surface at one end near the displacement ring, one end of the displacement ring is in contact with the inclined surface of the baffle, the interior of the rotating disk is provided with a limiting groove on the outer wall of the limiting block, the inner wall of the limiting groove is in contact with the outer wall of the limiting block, and the limiting spring is connected between the limiting block and the limiting groove.

[0014] As a further embodiment of the present invention: the plastic sheet is composed of several arc-shaped pieces, which are closely attached to each other in a conical shape, and a circular hole is provided at the top of the plastic sheet.

[0015] As a further embodiment of the present invention: a driving assembly is further provided between the base shell and the rotating frame to replace the driving mechanism. The driving assembly includes: an active gear disk located between the rotating frame and the base shell, and the active gear disk being fixedly connected to the rotating frame; a third motor located in the middle of the outer wall of the base shell for driving the active gear disk to rotate relative to it; a slide block located on the inner wall of the base shell, the slide block being fixedly connected to the base shell by welding; a slide rod slidably connected to the outer wall end of the slide block; a directional gear fixedly connected to the upper end of the slide rod, one end of the outer wall of the directional gear being connected to a telescopic column, and the other end of the outer wall of the directional gear being provided with a guide pin; a character gear located at the other end of the connecting shaft, the character gear having equidistantly distributed guide grooves on its four corners; a fixing block slidably sleeved on one end of the telescopic column, and a return spring sleeved on the outer wall of the telescopic column being provided between the fixing block and the directional gear.

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

[0017] By setting up a driving mechanism, the direction of the characters is displayed randomly, making it impossible to memorize the eye chart; the characters are made of paper to avoid electronic display flickering, which would affect the vision test; the testing process is automated, requiring no manual operation and avoiding human error, allowing for accurate vision testing independently; the testing process is standardized, highly accurate, and not subject to human control; the control terminal records the testing process and results, which are displayed on an external monitor, facilitating networking and systematization. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram illustrating the installation of the cover and base shell of the present invention;

[0020] Figure 3 This is a cross-sectional view of the cover shell and the base shell of the present invention;

[0021] Figure 4 This is a schematic diagram of the groove structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the installation of the second motor of the present invention;

[0023] Figure 6 This is a schematic diagram of the base shell structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the arc-shaped block of the present invention;

[0025] Figure 8 This is a cross-sectional view of the rotating disk of the present invention;

[0026] Figure 9 This is a partial cross-sectional view of the displacement ring of the present invention;

[0027] Figure 10 This is an enlarged view of point A in the present invention;

[0028] Figure 11 This is an enlarged view of point B in the present invention;

[0029] Figure 12 This is a schematic diagram of the drive component structure of the present invention;

[0030] Figure 13 This is a partial structural diagram of the driving component of the present invention.

[0031] In the diagram: 1. Base shell; 2. Cover shell; 3. Hanging ring; 4. Drive mechanism; 401. First motor; 402. Second motor; 403. Gear disc; 404. Spur gear; 5. Blocking mechanism; 501. Fixing frame; 502. Arc block; 503. Displacement ring; 504. Annular groove; 505. Partition plate; 506. Baffle plate; 507. Limiting block; 508. Limiting spring; 509. Vent hole; 510. Plastic sheet; 6. Drive assembly; 601. Active gear disc; 602. Slide rod; 603. Third motor; 604. Character gear; 605. Slide seat; 606. Directional gear; 607. Fixing block; 608. Telescopic column; 7. Rotating disk; 8. Connecting shaft; 9. Rotating frame. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-13In this embodiment of the invention, a fully automatic vision testing device includes a base shell 1 in the shape of an open cylinder; a cover shell 2 fitted onto the open end of the base shell 1, the base shell 1 and the cover shell 2 being fixedly connected by bolts, and a through hole 21 provided at one end of the outer wall of the cover shell 2; a hanging ring 3 provided at one end of the outer wall of the cover shell 2; a rotating frame 9 provided in the inner cavity of the base shell 1; the rotating frame 9 includes a central disc provided on one side of the center of the inner cavity of the base shell 1, and multiple cantilever rods equidistantly surrounding the central disc, with a connecting shaft 8 rotatably connected to the outer end of each of the multiple cantilever rods; a rotating disk 7 provided at one end of the connecting shaft 8 and near the cover shell 2; a groove provided in the middle of the outer surface of the rotating disk 7, the character "E" being pasted in the groove; and a driving mechanism 4 provided between the base shell 1 and the rotating frame 9, used to drive the rotating frame 9 and the rotating disk 7 to rotate, so that the characters "E" of different sizes are displayed randomly.

[0034] In this embodiment: the device can be hung on a wall or placed on the ground via the hanging ring 1. The character "E" is made of paper or plastic and is glued to a groove on the outer surface of the rotating disk 7. The size of the character "E" in each groove is different. In addition, this solution has a through hole 21 on the outer wall of the cover 2. When the rotating disk 7 moves to the through hole 21, the tester can look at the direction of the character "E" in the rotating disk 7 through the through hole 21. The area of ​​the cover 2 without the through hole 21 is a shielded area. When it is necessary to adjust the size of the character "E", the rotating frame 9 can be rotated by the drive mechanism 4. The rotation of the rotating frame 9 drives the rotating disk 7 to move circumferentially through the connecting shaft 8, thereby replacing the rotating disk 7 located at the through hole 21, thus adjusting the character "E" at the through hole 21. When adjusting the direction of the character "E", the rotating disk 7 can also be rotated by the drive mechanism 4, adjusting the direction of the character 408, so that the appearance of the character "E" is random and cheating is avoided.

[0035] It should be noted that the character "E" in this solution can be moved to the through hole 21 for display. Depending on the requirements, a different structure can be designed to move the character "E" to the through hole 21 by moving it up and down or left and right. As for how to achieve this, it can be done by using the lottery double-color ball mode, the roller shutter door's rolling belt type, or the piston push rod type.

[0036] Please refer to this carefully. Figure 3-13 The drive mechanism 4 includes: a first motor 401 for driving the rotating frame 9 to rotate; a second motor 402 located at one end of the outer wall of the base shell 1, the output shaft of the second motor 402 being rotatably connected to the outer wall of the base shell 1 via a bearing; a gear 403 fixedly connected to the output shaft end of the second motor 402 and located in the inner cavity of the base shell 1; and a spur gear 404 located at the other end of the connecting shaft 8 and meshing with the gear 403.

[0037] In this embodiment: the output shaft of the first motor 401 passes through the outer wall of the base shell 1, and the center of the rotating frame 9 is fixedly connected to the output shaft of the first motor 401. By starting the first motor 401, the rotating frame 9 can be driven to rotate, and the rotating disk 7 will pass through the through hole 21 in sequence, thereby replacing the rotating disk 7 located at the through hole 21. During the process of the rotating disk 7 passing through the through hole 21, it will be connected and meshed with the gear disk 403. When the rotating frame 9 stops rotating, the second motor 402 is started. The operation of the second motor 402 drives the gear disk 403 to rotate. The rotation of the gear disk 403 drives the spur gear 404 to rotate. The rotation of the spur gear 404 drives the connecting shaft 8 to rotate. The rotation of the connecting shaft 8 drives the rotating disk 7 to rotate. The rotation of the rotating disk 7 drives the character "E" to rotate, thereby adjusting the direction of the character "E".

[0038] In another embodiment, a drive assembly 6 is further provided between the base shell 1 and the rotating frame 9 to replace the drive mechanism 4. The drive assembly 6 includes an active gear disk 601, which is located between the rotating frame 9 and the base shell 1 and is fixedly connected to the rotating frame 9; a third motor 603 located in the middle of the outer wall of the base shell 1 for driving the active gear disk 601 to rotate relative to it; and a slide block 605 located on the inner wall of the base shell 1, which is fixedly connected to the base shell 1 by welding; and a sliding connection at the outer wall end of the slide block 605. The slide rod 602; a directional gear 606 fixedly connected to the upper end of the slide rod 602, one end of the outer wall of the directional gear 606 is connected to a telescopic column 608, and the other end of the outer wall of the directional gear 606 is provided with a guide pin; a character gear 604 is provided at the other end of the connecting shaft 8, and guide grooves are provided at equal intervals on the four corners of the character gear 604; a fixing block 607 is slidably sleeved on one end of the telescopic column 608, and a return spring sleeved on the outer wall of the telescopic column 608 is provided between the fixing block 607 and the directional gear 606.

[0039] Specifically, the drive assembly 6 uses a third motor 603 to drive the rotating frame 9 to rotate. When the rotating disk 7 does not coincide with the through hole, the bottom end of the slide rod 602 abuts against the groove on the active gear disk 601. As the rotating frame rotates, the slide rod 602 will be displaced along the groove of the active gear disk 601 and will be transferred to the tooth peak of the active gear disk 601. During this movement, the slide rod 602 gradually moves upward, which in turn pushes the directional gear 606 to move upward as well. The directional gear 606 drives the telescopic column 608 to move upward and penetrate into the telescopic hole in the fixed block 607. At this time, the spring is in a compressed state. The guide groove on one corner of the character gear 604 will contact the guide pin on the directional gear 606, and then the guide pin will drive the character gear 604 to rotate ninety degrees. This design can continuously shuffle the orientation of the character "E", so that the orientation of the character is displayed randomly, making it impossible to recite the eye chart, thereby improving the accuracy of the vision test.

[0040] Please refer to this carefully. Figure 3-11 The vision testing device also includes a blocking mechanism 5 disposed between the rotating disk 7 and the cover 2, used to block the outer surface of the rotating disk 7 as it moves and gradually approaches the through hole 21, so that the character "E" is always covered during the movement of the rotating disk 7. The blocking mechanism 5 includes a fixing frame 501 and an arc-shaped block 502. The fixing frame 501 is fixedly connected to the inner wall of the cover 2 and contacts the outer wall of the rotating disk 7. The arc-shaped block 502 is slidably connected to the inside of the rotating disk 7 and extends to the outer wall of the rotating disk 7. A displacement ring 503 is fixedly connected to one end of the arc-shaped block 502 inside the rotating disk 7. An annular groove 504 is formed on the outer wall of the displacement ring 503 inside the rotating disk 7. A partition 505 is fixedly connected to the inner wall of the annular groove 504. The wall contacts the outer wall of the annular groove 504. A baffle 506 extending to the inner wall of the groove is slidably connected inside the rotating disk 7. A limit block 507 is fixedly connected to the outer wall of the baffle 506. A limit spring 508 connects the limit block 507 and the rotating disk 7. A vent hole 509 is provided inside the rotating disk 7. One end of the vent hole 509 extends to the outer wall of the rotating disk 7, and the other end extends to the inner wall of the annular groove 504. A plastic sheet 510 is fixedly connected to the inner wall of the baffle 506. Furthermore, this blocking mechanism 5 does not coexist with the drive assembly 6; the blocking mechanism 5 only coexists with the drive mechanism 4.

[0041] In this embodiment: four arc-shaped blocks 502 are provided and are equidistantly distributed in a circle. The four gaps formed between the arc-shaped blocks 502 correspond to the four directions of the character 408. When the rotating disk 7 rotates to adjust the direction of the character "E", the rotation of the rotating disk 7 drives the arc-shaped blocks 502 to perform circumferential displacement. During the circumferential displacement, the arc-shaped blocks 502 come into contact with the fixed frame 501. The force on the arc-shaped blocks 502 is directed towards the inside of the rotating disk 7. The displacement of the arc-shaped blocks 502 causes the displacement ring 503 to slide in the annular groove 504. A hollow groove is formed between ring 503, annular groove 504, and partition 505. Air in the hollow groove is discharged through vent 509. Displacement ring 503 contacts the inclined surface of baffle 506, pushing baffle 506 to move. The displacement of baffle 506 causes limiting block 507 to move. Limiting block 507 slides in limiting groove, compressing limiting spring 508. Multiple baffles 506 contact each other to block the groove, thus blocking the character "E". When fixing bracket 501 moves to the next arc-shaped block 5... When there is a gap between 02, the limiting block 507 is reset by the elastic force of the limiting spring 508. The reset of the limiting block 507 drives the baffle 506 to reposition. The displacement of the baffle 506 pushes the displacement ring 503 to reposition. When the displacement ring 503 repositions, the volume of the hollow groove increases, and outside air enters the hollow groove through the vent 509. The rate at which outside air enters the hollow groove is relatively slow, so the displacement ring 503 can only reposition slowly. The repositioning of the displacement ring 503 drives the arc-shaped block 502 to reposition, thereby making... When the arc block 502 is not reset, the next arc block 502 contacts the fixing frame 501. The arc block 502 is subjected to force and moves towards the inside of the rotating disk 7 again. When the character "E" rotates to the specified direction, the fixing frame 501 does not contact the arc block 502, and the arc block 502 slowly resets. At the same time, the baffle 506 slowly opens to remove the obstruction of the groove, so that when the character "E" is adjusted in direction, the character "E" is automatically obstructed, preventing the tester from judging the direction of the character "E" by the number of rotations of the character "E".

[0042] Please refer to this carefully. Figure 1-6 The first motor 401 and the second motor 402 are both connected to the control terminal via wires. The control terminal is electrically connected to an external power supply via wires. The control terminal is also connected to a keyboard and an external display via wires.

[0043] In this embodiment: the first motor, the second motor and the third motor used in this solution are all servo motors. The rotation angle of the spur gear 404 and the rotating frame 9 is precisely controlled by the control terminal, so that the rotating disk 7 is accurately positioned at the through hole 21. The test subject answers the direction of the character "E" by operating the keyboard from a distance. If the selected direction matches the direction of the character "E", the control terminal controls the second motor 402 to operate. The operation of the second motor 402 causes the direction of the character "E" to change. If the test subject selects correctly continuously or reaches the required accuracy rate, the control terminal determines that the character "E" at this level can be seen clearly and starts the first motor 401. The operation of the first motor 401 drives the rotating disk 7 to move and replace it with a smaller "E" at the through hole 21. The test is repeated. If the selection is incorrect continuously, the control terminal determines that the character "E" at this level cannot be seen clearly and starts the first motor 401 to replace it with a larger "E" at the through hole 21. Finally, the correct visual acuity value is obtained. The control terminal can automatically rotate the character "E" of an appropriate size according to the test subject's test results. The test can set the number of tests and the accuracy rate for each character "E". Finally, the test process and test results are recorded and exported to an external monitor for display as needed. The parameters such as the number of correct attempts, accuracy rate, and rotation speed are adjustable through the control system program. During testing, the test process is executed automatically and the test results are recorded by the control system. Data can also be recorded by an external computer program, mobile APP, or other devices.

[0044] Please refer to this carefully. Figure 2 The outer wall of the cover shell 2 has a threaded hole that passes through the cover shell 2, and the outer wall of the base shell 3 has a connecting hole that passes through the base shell 3. There are several sets of threaded holes and connecting holes, which are circumferentially distributed on the outer walls of the cover shell 2 and the base shell 3. The inner wall of the threaded hole is connected with a matching bolt.

[0045] In this embodiment: when fixing the cover shell 2 and the base shell 3, the cover shell 2 is sleeved on the outer wall of the base shell 3, and the bolt is installed into the threaded hole. After the bolt passes through the threaded hole, it enters the connection hole, thereby fixing the cover shell 2 and the base shell 3.

[0046] Please refer to this carefully. Figure 7-11 Four arc-shaped blocks 502 are provided and are distributed equidistantly around the circumference. One end of the arc-shaped block 502 is provided with an arc-shaped surface. A sealing ring is provided at the junction of the outer wall of the displacement ring 503 and the annular groove 504. A sealing ring is provided at the junction of the partition plate 505 and the outer wall of the displacement ring 503.

[0047] In this embodiment: the rotating disk 7 rotates, causing the arc-shaped block 502 to move in a circular motion. During the circular motion, the arc-shaped block 502 contacts the fixed frame 501. The force on the arc-shaped block 502 moves towards the inside of the rotating disk 406. A hollow groove is formed between the displacement ring 503, the annular groove 504 and the partition plate 505. The hollow groove is connected to the outside through the vent hole 509. When the displacement ring 503 slides in the annular groove 504, the volume of the hollow groove decreases as the displacement ring 503 moves towards the partition plate 505. The air in the hollow groove is discharged through the vent hole 509. When the displacement ring 503 moves away from the partition plate 505, the volume of the hollow groove increases, and the outside air enters the hollow groove through the vent hole 509.

[0048] Please refer to this carefully. Figure 7-11 The baffle 506 has an inclined surface at one end near the displacement ring 503. One end of the displacement ring 503 is in contact with the inclined surface of the baffle 506. The interior of the rotating disk 7 has a limiting groove on the outer wall of the limiting block 507. The inner wall of the limiting groove fits against the outer wall of the limiting block 507. The limiting spring 508 is connected between the limiting block 507 and the limiting groove.

[0049] In this embodiment: the displacement of the arc-shaped block 502 causes the displacement ring 503 to slide within the annular groove 504. A hollow groove is formed between the displacement ring 503, the annular groove 504, and the partition 505. The air in the hollow groove is discharged through the vent 509. The displacement of the displacement ring 503 contacts the inclined surface of the baffle 506, pushing the baffle 506 to move. The displacement of the baffle 506 causes the limiting block 507 to move. The limiting block 507 slides within the limiting groove and compresses the limiting spring 508.

[0050] Please refer to this carefully. Figure 7-11 The plastic sheet 510 is composed of several arc-shaped pieces, which are closely attached to each other to form a cone shape. A round hole is opened at the top of the plastic sheet 510.

[0051] In this embodiment: the plastic sheet 510 is composed of several arc-shaped pieces. The arc-shaped pieces are fixedly connected to the vent 509 by heat fusion at the junction. A hollow groove is formed between the displacement ring 503, the annular groove 504 and the partition 505. The hollow groove is connected to the outside through the vent 509. When the air in the hollow groove is discharged through the vent 509, the plastic sheet 510 is subjected to air pressure, and the multiple arc-shaped pieces are deformed by force, separating and creating gaps between them. The air is discharged through the round hole and the gap. When the outside air enters the hollow groove through the vent 509, the arc-shaped pieces are tightly attached to each other, so that the air can only enter through the round hole. This makes the air in the hollow groove discharged faster and the outside air entering the hollow groove slower.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fully automated visual testing device, characterized in that, include: The base shell is open and cylindrical (1); A cover shell (2) is fitted onto the open end of the base shell (1). The base shell (1) and the cover shell (2) are fixedly connected by bolts, and one end of the outer wall of the cover shell (2) is provided with a through hole (21). A hanging ring (3) is provided at one end of the outer wall of the cover (2); A rotating frame (9) is provided in the inner cavity of the base shell (1); the rotating frame (9) includes a central disk located on one side of the center of the inner cavity of the base shell (1), and multiple cantilever rods equidistantly surrounding the central disk, with connecting shafts (8) rotatably connected to the outer ends of the multiple cantilever rods. A rotating disk (7) is located at one end of the connecting shaft (8) and near the cover (2); a groove is formed in the middle of the outer surface of the rotating disk (7), and the character "E" is pasted in the groove. A drive mechanism (4) is provided between the base shell (1) and the rotating frame (9) to drive both the rotating frame (9) and the rotating disk (7) to rotate so that the characters "E" of different sizes are displayed in a random orientation. The vision testing device also includes a shielding mechanism (5) disposed between the rotating disk (7) and the cover (2), which is used to shield the outer surface of the rotating disk (7) that is moving and gradually approaching the through hole (21), so that the character "E" is always covered during the movement of the rotating disk (7). The shielding mechanism (5) includes a fixed frame (501) and an arc-shaped block (502). The fixed frame (501) is fixedly connected to the inner wall of the cover (2) and contacts the outer wall of the rotating disk (7). The arc-shaped block (502) is slidably connected to the inside of the rotating disk (7) and extends to the outer wall of the rotating disk (7). A displacement ring (503) is fixedly connected to one end of the arc-shaped block (502) inside the rotating disk (7). An annular groove (504) is formed on the outer wall of the displacement ring (503) inside the rotating disk (7). A partition (505) is fixedly connected to the inner wall of the annular groove (504). The outer wall of the rotating disk (7) is in contact with the outer wall of the annular groove (504). A baffle (506) extending to the inner wall of the groove is slidably connected inside the rotating disk (7). A limit block (507) is fixedly connected to the outer wall of the baffle (506). A limit spring (508) is connected between the limit block (507) and the rotating disk (7). A vent hole (509) is opened inside the rotating disk (7). One end of the vent hole (509) extends to the outer wall of the rotating disk (7), and the other end of the vent hole (509) extends to the inner wall of the annular groove (504). A plastic sheet (510) is fixedly connected to the inner wall of the vent hole (509). The arc-shaped blocks (502) are provided in four and are distributed equidistantly around the circumference. One end of the arc-shaped blocks (502) is provided with an arc-shaped surface. A sealing ring is provided at the position where the outer wall of the displacement ring (503) meets the annular groove (504). A sealing ring is provided at the position where the partition plate (505) meets the outer wall of the displacement ring (503). The baffle (506) has an inclined surface at one end near the displacement ring (503), and one end of the displacement ring (503) is in contact with the inclined surface of the baffle (506). The interior of the rotating disk (7) is provided with a limiting groove on the outer wall of the limiting block (507). The inner wall of the limiting groove is in contact with the outer wall of the limiting block (507). The limiting spring (508) is connected between the limiting block (507) and the limiting groove. The plastic sheet (510) is composed of several arc-shaped pieces, which are closely attached to each other in a conical shape. A circular hole is provided at the top of the plastic sheet (510).

2. The fully automatic visual testing device of claim 1, wherein, The drive mechanism (4) includes: A first motor (401) is used to drive the rotating frame (9) to rotate. A second motor (402) is provided at one end of the outer wall of the base shell (1), and the output shaft of the second motor (402) is rotatably connected to the outer wall of the base shell (1) through a bearing; A gear disc (403) fixedly connected to the output shaft end of the second motor (402) and located within the inner cavity of the base housing (1); and A spur gear (404) is located at the other end of the connecting shaft (8) and meshes with the gear disk (403).

3. A fully automated visual testing device according to claim 2, wherein, A control terminal is provided on the outer wall end of the base shell (1) near the first motor (401). The first motor (401) and the second motor (402) are both connected to the control terminal through wires. The control terminal is electrically connected to an external power supply through wires. The control terminal is connected to a keyboard and an external display respectively.

4. The fully automatic vision testing device according to claim 1, characterized in that, The outer wall of the cover (2) is provided with a threaded hole that penetrates the cover (2), and the outer wall of the base shell (1) is provided with a connecting hole that penetrates the base shell (1). There are several sets of threaded holes and connecting holes, and they are circumferentially distributed on the outer walls of the cover (2) and the base shell (1). The inner wall of the threaded hole is connected with a matching bolt.

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