CN220025017U

CN220025017U - Height adjusting mechanism and vision screening device

Info

Publication number: CN220025017U
Application number: CN202222535404.3U
Authority: CN
Inventors: 张如杰; 任文斌; 常献刚
Original assignee: Beijing Airdoc Technology Co Ltd
Current assignee: Beijing Airdoc Technology Co Ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-11-17
Anticipated expiration: 2032-09-23

Abstract

The utility model discloses a height adjusting mechanism and a vision screening device, wherein the height adjusting mechanism comprises: a support frame including a first side plate and a second side plate; the transmission rod is vertically arranged between the first side plate and the second side plate, and two ends of the transmission rod are respectively fixed on the first side plate and the second side plate; the movable plate assembly is arranged between the first side plate and the second side plate, is in transmission fit with the transmission rod and is used for enabling the movable plate assembly to move up and down along the transmission rod; the fixed seat is connected with the movable plate assembly through a connecting part, so that the movable plate assembly and the fixed seat are linked through the connecting part. The vision screening device can realize high-precision height adjustment, the height adjustment process is smooth, and the condition of blocking can not occur in the adjustment process.

Description

Height adjusting mechanism and vision screening device

Technical Field

The utility model relates to the technical field of vision testing, in particular to a height adjusting mechanism and a vision screening instrument.

Background

Currently, vision prevention and control problems of teenagers are increasingly valued by countries and schools, and vision screening is also becoming more common in schools. Myopia prevention and control is a systematic engineering, and vision screening is a long-term frequently repeated task, such as screening every two or three months. And the shorter the screening period, the easier the problem can be found and solved in time. Especially early pseudomyopia, early pseudomyopia should be discovered and treated early, so that true myopia is avoided, and if the pseudomyopia is the cause of eye diseases, early treatment is facilitated, and irrecoverable consequences are avoided.

Vision screening has become a primary detection means for early amblyopia in teenagers. The vision screening instrument for vision screening is mainly used for measuring and screening diopter of human eyes. Currently, vision screening is performed by fixing the vision screening device in a set position, such as a table. The vision screening instrument is fixed differently, and then the user attaches his own eyes to the vision screening instrument for detection. However, the heights of users are greatly different, so that users with different heights need to adjust the body posture of the users to adapt to the height of the vision screening instrument when using the vision screening instrument, for example, the users need to screen in a bending or semi-squatting state. This not only causes inconvenience to the user, but also affects the efficiency and accuracy of the screening.

Disclosure of Invention

In order to solve at least one or more of the technical problems mentioned above, the present utility model proposes, in various aspects, a height adjustment mechanism and a vision screening device.

In a first aspect, the present utility model provides a height adjustment mechanism comprising: a support frame including a first side plate and a second side plate; the transmission rod is vertically arranged between the first side plate and the second side plate, and two ends of the transmission rod are respectively fixed on the first side plate and the second side plate; the movable plate assembly is arranged between the first side plate and the second side plate, is in transmission fit with the transmission rod and is used for enabling the movable plate assembly to move up and down along the transmission rod; the fixed seat is connected with the movable plate assembly through a connecting part, so that the movable plate assembly and the fixed seat are linked through the connecting part.

In one embodiment, the moving plate assembly comprises a moving plate and a transmission part fixedly connected with the moving plate; the transmission part is in threaded fit connection with the transmission rod.

In one embodiment, the device further comprises a driving component, which is arranged at the bottom of the transmission rod and is used for driving the transmission rod to rotate; the driving assembly comprises a worm wheel, a worm and a motor; the worm gear is arranged at the bottom end of the transmission rod, the worm is arranged at the output end of the motor and meshed with the worm gear, and the motor is arranged on the first side plate and used for driving the worm to drive the worm gear to rotate.

In one embodiment, the guide rod is disposed between the first side plate and the second side plate through the moving plate, and is used for guiding the up-and-down movement of the moving plate.

In one embodiment, the support frame further comprises a third side plate and a fourth side plate disposed between the first side plate and the second side plate; the inner wall of the third side plate and/or the fourth side plate is provided with a photoelectric limiting device, and a baffle is arranged on the side wall of the moving plate at a position opposite to the photoelectric limiting device and is used for being matched with the photoelectric limiting device to limit the up-and-down moving range of the moving plate.

In one embodiment, the device further comprises thrust bearings arranged at two ends of the transmission rod, and used for reducing friction force applied to the end of the transmission rod when the transmission rod rotates.

In one embodiment, the guide rod is sleeved in a hole penetrating through the moving plate, and the bushing is used for reducing friction between the guide rod and the moving plate.

In one embodiment, the connection member is a knuckle bearing.

In a second aspect, the present utility model provides a vision screening device comprising a height adjustment mechanism as described above, a base portion and a housing portion; the box body is covered on the base part, and a vision screening instrument is arranged on one side in the box body; the height adjusting mechanism is arranged below the vision screening instrument, a first side plate of the height adjusting mechanism is fixedly connected with the base part, and the fixing seat is fixedly connected with a bottom plate of the box body part; the other side of the base part, which is far away from the height adjusting mechanism, is connected with the bottom plate of the box part through a rotating shaft, so that the height adjusting mechanism drives the box part and the vision screening instrument to rotate around the rotating shaft relative to the base part.

In one embodiment, the motor further comprises a control module electrically connected with the motor for controlling the operation of the motor; and the motor is in signal connection with the photoelectric limiting device and is used for receiving the signal of connection or disconnection of the photoelectric limiting device and controlling the working state of the motor according to the received signal.

The embodiment of the utility model provides a height lifting mechanism and a vision screening device, which are mainly characterized in that a fixed seat is connected with a movable plate assembly through a connecting part, so that the movable plate assembly drives the fixed seat to move. And the rotation of the box body part relative to the base part is realized through the height lifting mechanism, so that the height of the vision screening device is adjusted. The cooperation of the worm wheel and the worm can realize high-precision height adjustment, and the height of the vision screening device can be adjusted to any position in the travel range. The joint bearing is used as a connecting part, so that the degree of freedom of the height adjusting mechanism is increased, the smooth height adjusting process of the vision screening device is ensured, and the condition of blocking in the adjusting process is avoided.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

FIGS. 1 and 2 are schematic views showing a height adjusting mechanism according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the overall structure of a vision screening device according to an embodiment of the present utility model;

FIG. 4 is a schematic view showing an internal structure of a vision screening apparatus according to an embodiment of the present utility model;

FIG. 5 is a cross-sectional view showing the internal structure of a vision screening apparatus according to an embodiment of the present utility model;

FIGS. 6 and 7 are schematic views showing the connection of the height adjusting mechanism to the base portion and the case portion in the embodiment of the present utility model;

fig. 8A and 8B are schematic views illustrating rotation of a housing portion of the vision screening apparatus with respect to a base portion in an embodiment of the present utility model.

Reference numerals:

1. the vision screening instrument comprises a supporting frame, 101, a first side plate, 102, a second side plate, 103, a third side plate, 104, a fourth side plate, 2, a transmission rod, 3, a moving plate assembly, 31, a moving plate, 32, a transmission part, 4, a driving assembly, 401, a worm wheel, 402, a worm, 403, a motor, 5, a fixed seat, 6, a connecting part, 7, a guide rod, 8, a photoelectric limiting device, 9, a blocking piece, 10, a bushing, 100, a height adjusting mechanism, 200, a base part, 300, a box part, 310, a bottom plate, 320, a rotating shaft, 400 and the vision screening instrument.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the disclosure. Based on the embodiments in this disclosure, all other embodiments that may be made by those skilled in the art without the inventive effort are within the scope of the present disclosure.

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, an embodiment of the present utility model provides a height adjusting mechanism 100 including a support frame 1, a transmission rod 2, a moving plate assembly 3, a driving assembly 4 and a fixing base 5. The support frame 1 includes a first side plate 101 (or referred to as a "lower side plate" in the position illustrated in the drawing), a second side plate 102 (or referred to as an "upper side plate" in the drawing), a third side plate 103 (or referred to as a "left side plate" in the drawing), and a fourth side plate 104 (or referred to as a "right side plate" in the drawing) to form one frame structure. The transmission rod 2 is vertically arranged between the lower side plate 101 and the upper side plate 102, and two ends of the transmission rod are respectively fixed on the lower side plate 101 and the upper side plate 102. The movable plate assembly 3 is disposed between the lower side plate 101 and the upper side plate 102, and is in driving engagement with the driving rod 2, so that the movable plate assembly 3 can move up and down along the driving rod 2. The driving component 4 is arranged at the bottom of the transmission rod 2 and is used for driving the transmission rod 2 to rotate. The fixed seat 5 is connected with the movable plate assembly 3 through the connecting part 6, so that the movable plate assembly 3 and the fixed seat 5 are linked through the connecting part 6.

In a specific embodiment, the moving plate assembly 3 includes a moving plate 31 and a transmission member 32 fixedly connected to the moving plate 31; the transmission part 32 is in threaded fit connection with the transmission rod 2. When the transmission part 32 is in threaded fit connection with the transmission rod 2 and moves up and down along the transmission rod 2, the transmission part 32 can drive the moving plate 31 fixedly connected with the transmission part to move up and down along the direction of the transmission rod 2. In one embodiment, the driving rod 2 may be a threaded rod, and the driving plate 31 is provided with a hole having an area larger than the cross section of the driving rod 2, so that the driving rod 2 passes through the driving plate 31 through the hole without contacting the driving plate 31, and is only in threaded engagement with the driving member 32.

In a specific embodiment, the drive assembly 4 includes a worm gear 401, a worm 402, and a motor 403; the worm wheel 401 is disposed at the bottom end of the transmission rod 2, and the worm wheel 401 may be fixed to the transmission rod 2 by a set screw, so that the worm wheel 401 and the transmission rod 2 can rotate together. The worm 402 is disposed at the output end of the motor 403, and the worm 402 is fixed to the output end shaft of the motor 403 by a set screw. The worm wheel 401 is meshed with the worm 402, and the motor 403 may be fixed on the lower side plate 101, so as to drive the worm 402 to rotate the worm wheel 401 meshed with the worm 402, thereby driving the transmission rod 2 to rotate. Because the upper and lower ends of the transmission rod 2 are respectively at the lower side plate 101 and the upper side plate 102, the transmission rod 2 rotates in place and drives the transmission part 32 in threaded fit with the transmission rod 2 to move up and down along the transmission rod 2, thereby driving the moving plate 31 to move up and down along the transmission rod 2.

In order to improve the stability of the moving plate 31 when moving up and down along the transmission rod 2, the utility model also proposes that a guide rod 7 which passes through the moving plate 31 and is parallel to the transmission rod 2 is arranged between the lower side plate 101 and the upper side plate 102, and the guide rod plays a role in guiding the up and down movement of the moving plate 31. Preferably, two guide bars 7 may be provided on the moving plate 31 symmetrically to the driving bar 2. The guide rod 7 passes through the moving plate 31 through a through hole formed in the moving plate 31. When the moving plate 31 moves up and down along the transmission rod 2, a bushing 10 may be provided at a through hole where the guide rod 7 passes through the moving plate 31 to reduce friction between the guide rod 7 and the moving plate 31 and perform lubrication. The bushing 10 may be an oil-free bushing.

In order to limit the travel of the moving plate 31 up and down along the transmission rod 2, the solution of the present utility model also proposes to provide the inner wall of the left side plate 103 and/or the right side plate 104 with a photoelectric limiting device 8. And a baffle 10 is provided on the side wall of the moving plate 31 at a position opposite to the photoelectric limiting device 8 for cooperating with the photoelectric limiting device 8 to limit the up-and-down moving range of the moving plate 31. The photoelectric limiting device 8 is in signal connection with the motor 403, and the operation and stop of the motor 403 are controlled through the conduction and the interruption of the optical signals in the photoelectric limiting device 8. In one implementation scenario, when the moving plate 31 moves up along the transmission rod 2 to the point that the blocking piece 10 is engaged with the photoelectric limiting device 8 provided at a set height on the inner wall of the left side plate 103 and/or the right side plate 104 (i.e., the limit position where the moving plate 31 moves up), the mid-light signal of the photoelectric limiting device 8 is blocked by the blocking piece 10. The electro-optical spacing device 8 then sends a signal to the motor 403, causing the motor 403 to stop running.

In one implementation scenario, in order to reduce the friction force received by the two ends of the transmission rod 2 during rotation, thrust bearings are respectively disposed at the two ends of the transmission rod 2, so as to protect the two ends of the transmission rod 2.

When the movable plate assembly 3 moves up and down along the transmission rod 2, the movable plate assembly 3 is linked with the fixed seat 5 through the connecting part 6. The linkage structure rotates the connecting member 6 relative to the moving plate assembly 3 and the fixed base 5 during movement. In order to make the movement of the movable plate assembly 3 relative to the fixed seat 5 smoother, the connecting member 6 is a knuckle bearing, which increases the degree of freedom of the height adjusting mechanism 100, thereby ensuring that the movable plate assembly 3 does not "seize" in the movement of lifting and lowering by rotation relative to the fixed seat 5.

As shown in fig. 3 and 4, an embodiment of the present utility model provides a vision screening apparatus including the height adjusting mechanism 100, the base portion 200, and the case portion 300 described above. The case 300 is covered on the base 200 and encloses a closed space with the base 200. A vision screening instrument 400 is provided on one side within the housing 300 (the left side within the housing 300 according to the position illustrated in the figures). The height adjustment mechanism 100 is also disposed in a space enclosed by the base portion 200 and the box portion 300, and is located below the vision screening instrument 400.

As shown in fig. 5 and 6, the lower plate 101 of the height adjusting mechanism 100 is fixedly connected to the base 200, and the fixed base 5 of the height adjusting mechanism 100 is fixedly connected to the bottom plate 310 at the bottom of the housing 300. In an exemplary operation, when the motor 403 of the height adjusting mechanism 100 is operated, the worm 402 is driven to rotate together, and the driving rod 2 is driven to rotate by the worm wheel 401 engaged with the worm 402, so that the moving plate assembly 3 threadedly coupled with the driving rod 2 moves up and down along the driving rod 2. Further, when the moving plate assembly 3 moves upward along the driving rod 2, the moving plate 31 may pull the fixing base 5 through the connection part 6, so that the bottom plate 310 of the case 300 connected to the fixing base 5 may be pulled up, so that the vision screening instrument 400 disposed on the bottom plate 310 may be pulled up together. Meanwhile, as shown in fig. 7, since the other side of the base part 200 away from the height adjusting mechanism 100 is connected to the bottom plate 310 of the case part 300 through the rotation shaft 320, the bottom plate 310 is fixed with the base part 200 at the rotation shaft 320 so as not to move upward. Thus, the box 300 and the vision screening device 400 can only be rotated and lifted relative to the base 200 around the rotation shaft 320 under the driving of the height adjusting mechanism 100. Thereby enabling height adjustment of the vision screening apparatus 400. Fig. 8A and 8B show an initial state of the vision screening device and a state after the height adjustment.

In one implementation, a control module (not shown) may also be provided in the vision screening apparatus of the present utility model. The control module may be electrically connected to the motor 403, for example, for controlling the operation of the motor 403; and can also be connected with the photoelectric limiting device 8 in a signal manner, and is used for receiving the signal of connection or disconnection of the photoelectric limiting device 8 and controlling the working state (running or stopping) of the motor 403 according to the received signal.

In one implementation, a touch screen is provided on the outer surface of the housing 300 for the convenience of a user to operate the vision screening apparatus of the present utility model. The user operates the control module by pressing a key set on the touch screen. For example, by providing up and down buttons on the touch screen, the height of the vision screening apparatus 400 in the vision screening apparatus can be easily and quickly adjusted.

In the foregoing description of the present specification, the terms "fixed," "mounted," "connected," or "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, in terms of the term "coupled," it may be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other. Therefore, unless otherwise specifically defined in the specification, a person skilled in the art can understand the specific meaning of the above terms in the present utility model according to the specific circumstances.

Those skilled in the art will also appreciate from the foregoing description that terms such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise" and the like are used herein for the purpose of facilitating description and simplifying the description of the present utility model only, and do not necessarily require that the particular orientation, configuration and operation be construed or implied by the terms of orientation or positional relationship shown in the drawings of the present specification, and therefore the terms of orientation or positional relationship described above should not be interpreted or construed as limiting the scope of the present utility model.

In addition, the terms "first" or "second" and the like used in the present specification to refer to the numbers or ordinal numbers are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present specification, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless explicitly defined otherwise.

While various embodiments of the present utility model have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Many modifications, changes, and substitutions will now occur to those skilled in the art without departing from the spirit and scope of the utility model. It should be understood that various alternatives to the embodiments of the utility model described herein may be employed in practicing the utility model. The appended claims are intended to define the scope of the utility model and to cover such modular compositions, equivalents, or alternatives falling within the scope of the claims.

Claims

1. A height adjustment mechanism (100), comprising:

a support frame (1) comprising a first side plate (101) and a second side plate (102);

the transmission rod (2) is vertically arranged between the first side plate (101) and the second side plate (102), and two ends of the transmission rod (2) are respectively fixed on the first side plate (101) and the second side plate (102);

the movable plate assembly (3) is arranged between the first side plate (101) and the second side plate (102) and is in transmission fit with the transmission rod (2) so as to enable the movable plate assembly (3) to move up and down along the transmission rod (2);

the fixed seat (5) is connected with the movable plate assembly (3) through a connecting part (6), so that the movable plate assembly (3) and the fixed seat (5) are linked through the connecting part (6).

2. The height adjustment mechanism according to claim 1, wherein the moving plate assembly (3) comprises a moving plate (31) and a transmission member (32) fixedly connected to the moving plate (31); the transmission part (32) is in threaded fit connection with the transmission rod (2).

3. The height adjusting mechanism according to claim 2, further comprising a driving assembly (4) provided at the bottom of the transmission rod (2) for driving the transmission rod (2) to rotate;

the driving assembly (4) comprises a worm wheel (401), a worm (402) and a motor (403);

the worm wheel (401) is arranged at the bottom end of the transmission rod (2), the worm (402) is arranged at the output end of the motor (403) and meshed with the worm wheel (401), and the motor (403) is arranged on the first side plate (101) and used for driving the worm (402) to drive the worm wheel (401) to rotate.

4. A height adjusting mechanism according to claim 3, further comprising a guide bar (7) disposed between the first side plate (101) and the second side plate (102) through the moving plate (31) for guiding up-and-down movement of the moving plate (31).

5. The height adjustment mechanism according to claim 4, wherein the support frame (1) further comprises a third side plate (103) and a fourth side plate (104) arranged between the first side plate (101) and the second side plate (102); the inner wall of the third side plate (103) and/or the inner wall of the fourth side plate (104) are provided with photoelectric limiting devices (8), and a baffle (9) is arranged on the side wall of the moving plate (31) at a position opposite to the photoelectric limiting devices (8) and is used for being matched with the photoelectric limiting devices (8) to limit the up-and-down moving range of the moving plate (31).

6. The height adjustment mechanism according to claim 5, further comprising thrust bearings provided at both ends of the transmission rod (2) for reducing friction force applied to the ends of the transmission rod (2) when it rotates.

7. The height adjustment mechanism according to claim 6, further comprising a bushing (10) which fits within a hole of the guide bar (7) passing through the moving plate (31) for reducing friction between the guide bar (7) and the moving plate (31).

8. Height adjustment mechanism according to claim 7, characterized in that the connecting part (6) is a knuckle bearing.

9. A vision screening device, characterized by comprising a height adjustment mechanism (100) according to any one of claims 1 to 8, a base portion (200) and a housing portion (300);

the box body (300) is covered on the base (200), and a vision screening instrument (400) is arranged on one side in the box body (300);

the height adjusting mechanism (100) is arranged below the vision screening instrument (400), a first side plate (101) of the height adjusting mechanism (100) is fixedly connected with the base part (200), and the fixing seat (5) is fixedly connected with a bottom plate (310) of the box body part (300);

the other side of the base part (200) away from the height adjusting mechanism (100) is connected with a bottom plate (310) of the box part (300) through a rotating shaft (320), so that the height adjusting mechanism (100) drives the box part (300) and the vision screening instrument (400) to rotate around the rotating shaft (320) relative to the base part (200).

10. The vision screening device according to claim 9, characterized in that the height adjustment mechanism (100) is a height adjustment mechanism (100) according to any one of claims 5 to 8, the vision screening device further comprising a control module electrically connected to the motor (403) for controlling the operation of the motor (403); and the motor (403) is connected with the photoelectric limiting device (8) in a signal manner, and is used for receiving the signal of connection or disconnection of the photoelectric limiting device (8) and controlling the working state of the motor (403) according to the received signal.