A computer-controlled refractometer lifting and control system

Abstract

This utility model discloses a lifting control system for a computer-controlled optometry instrument. The control system includes an operating table assembly, a control handle assembly, a lifting component assembly, and a controller assembly. The control handle assembly includes a central swing rod assembly, a rotating sleeve, and a grating disk assembly. The rotating sleeve is rotatably fitted onto the outside of the central swing rod assembly, and drives the grating disk assembly to rotate. A first photoelectric sensor is fixedly installed on the table surface of the operating table assembly and is connected to the controller assembly via signal transmission. The control method includes four steps: start / stop determination, control speed determination, control continuity determination, and limit position determination. Beneficial effects: This utility model uses an externally mounted grating disk assembly and an externally mounted photoelectric sensor, which improves the control accuracy of the lifting device; the integrated components of the control handle assembly facilitate installation and maintenance; the controller assembly's settings effectively filter out misoperation or jitter interference and achieve electronic limit locking.

Description

Technical Field

[0001] This utility model relates to a component of an optometry device, and more particularly to a lifting and control system for a computerized optometry instrument, belonging to the technical field of optometry equipment. Background Technology

[0002] A computerized refractometer is a precision instrument used to objectively measure the refractive state of the human eye. It is an optical testing instrument mainly composed of optical, electronic, and mechanical components. During the measurement, the operating handle mechanism is usually used to adjust the relative spatial position between the optical measuring unit and the eye being examined to locate and focus the eyeball, ensuring that the corneal reflection point is centered in the pupil. The position of the eyeball is observed through a monitor, and the focus is adjusted back and forth until the image is clear.

[0003] The existing technology has the following problems: 1. Accidental activation due to vibration: Slight vibration of the joystick (such as hand tremor) triggers the lifting signal, causing the motor to operate in a "twitching" manner, with a positioning error of ±0.5mm or more; 2. Limit failure: Relying on mechanical collision limit, the risk of overtravel is high after wear, which increases the failure rate of lead screw and motor.

[0004] Chinese patent CN 113876294 A discloses an operating handle for a computerized refractometer. This patent features a rotary kinematic pair in the middle of the operating handle, which can rotate around a handle support. The rotary kinematic pair includes a grating rotary encoder, and the handle support is equipped with a dual-channel grating control board for detecting the rotation signal of the grating rotary encoder. When controlling the lifting and lowering of the optical measurement unit, the rotary kinematic pair is rotated independently; when controlling the translation of the optical measurement unit, the operating handle below the rotary kinematic pair is moved. This partitioned operation of the operating handle ensures that the lifting and translation of the optical measurement unit do not interfere with each other, thus preventing misunderstanding. However, the aforementioned operating handle has a complex structure, and during operation, there is still a risk of misunderstanding the rotary kinematic pair, causing the lifting mechanism to be falsely triggered. Summary of the Invention

[0005] Purpose of the invention: The purpose of this utility model is to address the problems existing in the prior art by proposing a computer optometer lifting control system; it can effectively filter the influence of misoperation or vibration interference on the control accuracy of the lifting device, and realize electronic limit locking to avoid the problems existing in mechanical collision limit.

[0006] Technical Solution: A computer-controlled optometry instrument lifting and control system includes an operating table assembly, a control handle assembly, a lifting component assembly, and a controller assembly. The control handle assembly and the lifting component assembly are respectively mounted on the operating table assembly. The control handle assembly controls the lifting and lowering movement of the lifting component assembly through the controller assembly. The control handle assembly includes a central swing rod assembly, a rotating sleeve, and a grating disk assembly. The rotating sleeve is rotatably fitted outside the central swing rod assembly and drives the grating disk assembly to rotate. The grating disk assembly is equipped with a first photoelectric sensor, which is fixedly mounted on the table surface of the operating table assembly and signal-connected to the controller assembly.

[0007] This utility model adopts a structure that combines an external grating disk assembly with an external photoelectric sensor, which makes the structure simpler and facilitates the installation, debugging, maintenance, and repair of the photoelectric sensor.

[0008] In a preferred embodiment, in order to enable the rotating sleeve to drive the grating disk assembly to rotate without affecting the oscillation of the rotating sleeve with the central swing rod assembly, a driving spherical shell is fixedly connected to the bottom of the rotating sleeve. The driving spherical shell is a hollow structure with an open bottom, and a positioning groove extending along the same longitude direction is provided on the outer surface of the driving spherical shell. A positioning pin is provided inside the grating disk assembly. One end of the positioning pin is fixedly connected to the grating disk assembly, and the other end is located in the positioning groove.

[0009] When the rotating sleeve is rotated, it drives the drive ball housing to rotate together, and the inner wall of the positioning groove pushes the positioning pin, thereby making the grating disk assembly rotate together; when it is necessary to swing the central swing rod assembly, the positioning groove slides or rotates relative to the positioning pin, thereby making the central swing rod assembly swing freely, while the grating disk assembly only rotates, and they influence each other.

[0010] In a preferred embodiment, in order to meet the control requirements of the control handle assembly and achieve integration, the bottom of the central swing arm assembly is provided with a mounting base assembly, and the central swing arm assembly is swayably and through-mounted within the mounting base assembly; this allows the central swing arm assembly to swing relative to the mounting base assembly, thereby controlling the horizontal movement of the optometer.

[0011] The mounting base assembly has a cylindrical flange, and the drive ball housing sits on the cylindrical flange through a bottom opening; this allows the drive ball housing to swing with the central swing rod assembly.

[0012] The mounting base assembly is provided with an upper cover plate, and the mounting base assembly and the upper cover plate are fixedly connected by a connecting column; the grating disk assembly is rotatably connected to the upper cover plate by a bearing.

[0013] All components of the control handle assembly are integrated into a complete set by mounting the base assembly, top cover, and connecting column, while meeting the control action requirements, thus facilitating overall installation and replacement.

[0014] Preferably, to improve the flexibility of the drive spherical shell's movement, the inner surface of the drive spherical shell is evenly distributed with inwardly protruding ribs arranged along the spherical longitudinal direction. These inwardly protruding ribs prevent direct contact between the inner wall of the drive spherical shell and the cylindrical flange, reducing the contact area and improving the flexibility of the drive spherical shell's movement.

[0015] Preferably, to further improve the flexibility of the drive spherical shell's movement, the outer diameter end of the cylindrical flange is rounded. The rounded corner contacts the inner wall or ribs of the drive spherical shell, further enhancing the flexibility of its movement.

[0016] Preferably, to avoid mechanical collision limiting affecting the overall service life, the lifting assembly includes a lifting base and a lifting platform, with a photoelectric limiting component between the lifting base and the lifting platform. This photoelectric limiting component is signal-connected to the controller assembly. The signal detected by the photoelectric limiting component is fed back to the controller assembly, which then achieves limiting by promptly shutting down the drive mechanism between the lifting base and the lifting platform. This effectively avoids problems caused by collisions during mechanical limiting.

[0017] In a preferred embodiment, to further realize the photoelectric limiting function, the photoelectric limiting component includes a notch baffle and a second photoelectric sensor. The second photoelectric sensor is fixedly installed on the lifting base, and the notch baffle is fixedly installed on the lifting platform in the vertical direction, moving up and down together with the lifting platform. When the notch baffle blocks the optical path of the second photoelectric sensor, the lifting assembly works normally; otherwise, the lifting assembly is immediately shut down. The notch baffle has a notch near the connection of the lifting platform, and the length from the lower edge of the notch baffle to the lower edge of the notch baffle is the lifting stroke of the lifting platform.

[0018] In a preferred embodiment, to effectively avoid misoperation and filter operational jitter, the first photoelectric sensor is a dual-channel photoelectric sensor, the grating disk assembly has slits evenly distributed along its circumference, the number of slits is greater than or equal to 100, and the phase difference between the dual-channel photoelectric sensors is 85°-95°. Direction is determined by comparing the timing of the dual-channel signals, thereby controlling the lifting and lowering, and jitter and misoperation are filtered out by setting a threshold for the number of signal cycles.

[0019] A method for controlling a computerized refractometer lifting control system includes the following steps: Step 1: Start / Stop Determination. When the operator rotates the rotating sleeve, the controller assembly receives a pulse signal from the first photoelectric sensor. The controller assembly compares the timing of the dual signals to determine whether to rise or fall. If the number of pulse signals received within the set start time does not reach the set start threshold, the lifting assembly will not start. If the number of pulse signals received within the set start time reaches the set start threshold, the lifting assembly will start immediately and proceed to Step 2. Step 2: Speed ​​determination. The controller assembly controls the movement speed of the lifting component assembly according to the frequency of the pulse signal. The higher the frequency, the faster the movement speed, and vice versa. Step 3: Operation continuity determination. If the controller assembly does not receive a connection pulse signal or receives a connection reverse pulse signal within the set reset time, the operation continuity is interrupted, and the process returns to Step 1. Step 4: Limit position determination. When the controller assembly receives the photoelectric signal from the second photoelectric sensor, the lifting assembly immediately stops; when the controller assembly receives a reverse pulse signal, it starts the lifting assembly; otherwise, it remains locked; when the controller assembly no longer receives the photoelectric signal from the second photoelectric sensor, proceed to step 1.

[0020] In a preferred embodiment, to further effectively filter out erroneous operations, the pulse signals received during the start-up time in step one are set to be continuous opposing pulse signals. If the signal interruption time exceeds the set start-up time or the received reverse pulse signal is received, the counting is restarted.

[0021] Beneficial effects: This utility model adopts a structure that combines an external grating disk assembly with an external photoelectric sensor, which allows for the use of a larger grating disk, thereby improving the control accuracy of the lifting device; all components of the operating handle assembly are integrated into a complete set of components by mounting the base assembly, the top cover plate, and the connecting column, while meeting the control actions, thus facilitating overall installation and replacement; the settings of the controller assembly can effectively filter the impact of misoperation or vibration interference on the control accuracy of the lifting device, and realize electronic limit locking to avoid problems existing in mechanical collision limit. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the first overall structure of the present invention; Figure 2This is a schematic diagram of the second overall structure of the present invention; Figure 3 This is a partial view of the mounting position of the grating disk assembly and the first photoelectric sensor of this utility model; Figure 4 This is a partial cross-sectional view of the control handle of this utility model; Figure 5 This is an assembly cross-sectional view of the control handle assembly of this utility model; Figure 6 This is a cross-sectional view of the driving spherical shell of this utility model; Figure 7 This is a partial view of the lifting assembly of this utility model; Figure 8 This is a view showing the positional relationship between the grating disk assembly and the first photoelectric sensor of this utility model. Figure 9 This is a schematic diagram of the pulse signal of the dual-channel photoelectric sensor of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] like Figure 1 , 2 As shown in Figure 3, a computer-controlled optometry instrument lifting and control system includes an operating table assembly 1, a control handle assembly 2, a lifting component assembly 3, and a controller assembly. The control handle assembly 2 and the lifting component assembly 3 are respectively mounted on the operating table assembly 1. The control handle assembly 2 controls the lifting and lowering movement of the lifting component assembly 3 through the controller assembly. The control handle assembly 2 includes a central swing rod assembly 21, a rotating sleeve 22, and a grating disk assembly 23. The rotating sleeve 22 is rotatably fitted outside the central swing rod assembly 21 and drives the grating disk assembly 23 to rotate. The grating disk assembly 23 is equipped with a first photoelectric sensor 4, which is fixedly mounted on the table surface of the operating table assembly 1 and is signal-connected to the controller assembly.

[0028] This utility model adopts a structure that combines an externally mounted grating disk assembly 23 with an externally mounted photoelectric sensor. The structure is simpler and facilitates the installation, debugging, maintenance, and repair of the photoelectric sensor. The control handle assembly 2 is mounted on the control panel assembly 1 via a mounting bracket 5. The control handle assembly 2 is a modular set of components, and the mounting bracket 5 allows for the overall installation and removal, improving the convenience of maintenance and assembly.

[0029] like Figure 4 As shown, in order to enable the rotating sleeve 22 to drive the grating disk assembly 23 to rotate without affecting the swaying of the rotating sleeve 22 with the central swing rod assembly 21, a driving spherical shell 24 is fixedly connected to the bottom of the rotating sleeve 22. The driving spherical shell 24 is a hollow structure with an open bottom. The outer surface of the driving spherical shell 24 is provided with a positioning groove 241 extending along the same longitude direction. A positioning pin 25 is provided inside the grating disk assembly 23. One end of the positioning pin 25 is fixedly connected to the grating disk assembly 23, and the other end is located in the positioning groove 241.

[0030] When the rotating sleeve 22 is rotated, it drives the drive ball shell 24 to rotate together. The inner wall of the positioning groove 241 pushes the positioning pin 25, thereby realizing the rotation of the grating disk assembly 23. When it is necessary to swing the central swing rod 21 assembly, the positioning groove 241 slides or rotates relative to the positioning pin 25, thereby realizing the free swing of the central swing rod assembly 21. At the same time, the grating disk assembly 23 only rotates, and they influence each other.

[0031] like Figure 5As shown, in order to meet the control requirements of the control handle assembly 2 and achieve integration, the bottom of the central swing rod assembly 21 is provided with a mounting base assembly 26, and the central swing rod assembly 21 is swayably and through-mounted in the mounting base assembly 26; the mounting base assembly 26 is provided with a cylindrical flange 261, and the drive ball housing 24 sits on the cylindrical flange 261 through the bottom opening; an upper cover plate 27 is provided above the mounting base assembly 26, and the mounting base assembly 26 and the upper cover plate 27 are fixedly connected by a connecting column 28; the grating disk assembly 23 is rotatably connected to the upper cover plate 27 through a bearing 29.

[0032] All components of the control handle assembly 2 are integrated into a complete set of components by mounting the base assembly 26, the top cover 27, and the connecting column 28, while satisfying the control actions, thus facilitating overall installation and replacement.

[0033] like Figure 5 and 6 As shown, in order to improve the flexibility of the drive spherical shell 24, the inner surface of the drive spherical shell 24 is evenly distributed with inwardly protruding ribs 242 arranged along the longitudinal direction of the sphere. The inwardly protruding ribs 242 can prevent the inner wall of the drive spherical shell 24 from directly contacting the cylindrical flange 261, reduce the contact area, and improve the flexibility of the drive spherical shell 24.

[0034] To further improve the flexibility of the drive spherical shell 24, the outer diameter end of the cylindrical flange 261 is rounded. The rounded corners contact the inner wall or ribs 242 of the drive spherical shell 24, further enhancing the flexibility of its movement.

[0035] like Figure 7 As shown, in order to avoid mechanical collision limiting affecting the overall service life, the lifting assembly 3 includes a lifting seat 31 and a lifting platform 32. A photoelectric limiting component 33 is provided between the lifting seat 31 and the lifting platform 32. The photoelectric limiting component 33 is signal connected to the controller assembly.

[0036] The signal detected by the photoelectric limit component 33 is fed back to the controller assembly. The controller assembly achieves the limit by timely shutting down the drive device between the lifting seat 31 and the lifting platform 32, which can effectively avoid problems caused by mechanical limit collisions.

[0037] To further realize the photoelectric limiting function, the photoelectric limiting component 33 includes a notch baffle 331 and a second photoelectric sensor 332. The second photoelectric sensor 332 is fixedly installed on the lifting seat 31, and the notch baffle 331 is fixedly installed on the lifting platform 32 in the vertical direction and rises and falls together with the lifting platform 32. When the notch baffle 331 blocks the optical path of the second photoelectric sensor 332, the lifting component assembly 3 works normally; otherwise, the lifting component assembly 3 is immediately shut down. The notch baffle 331 has a notch near the connection of the lifting platform 32, and the length from the lower edge of the notch baffle 331 to the lower edge of the notch baffle 331 is the lifting stroke of the lifting platform 32.

[0038] like Figure 8 and 9 As shown, to effectively avoid misoperation and filter operational jitter, the first photoelectric sensor 4 is a dual-channel photoelectric sensor. The grating disk assembly 23 has 128 slits evenly distributed along its circumference, and the phase difference between the dual-channel photoelectric sensors is 90°. The direction of rotation is determined by comparing the timing of the dual signals, thereby controlling the lifting and lowering. Jitter and misoperation are filtered out by setting a threshold for the number of signal cycles.

[0039] The 128 slits correspond to a resolution of 2.8125° / slit, enabling precise control. In contrast, the raster disk in the comparison file is located inside the control handle, making it impossible to create a high-resolution raster disk, which in turn affects the precision of the lifting and lowering operation.

[0040] The dual photoelectric sensors are symmetrically arranged and synchronously collect photoelectric signals to form two pulse signals with a 90° phase difference; the dual photoelectric sensors naturally distinguish the lifting and lowering directions without the need for additional hardware.

[0041] like Figure 9 As shown, the direction of motion is determined by comparing the edge sequence of phase A and phase B signals: When rotating in the forward direction, the rising edge of the A-phase signal appears before the B-phase signal, meaning that the A-phase signal leads the B-phase signal by 90°.

[0042] When rotating in the opposite direction, the rising edge of phase B signal appears before phase A signal, that is, phase B leads phase A by 90°.

[0043] Compare the timing of the two signals. If phase A precedes phase B, a rising command is issued; otherwise, a falling command is issued.

[0044] The controller assembly uses dual photoelectric sensors to collect data and, based on a set signal de-jitter threshold and time factor, determines the operator's true intention. This effectively avoids misoperation and filters out the operational impact caused by operational jitter.

[0045] A method for controlling a computerized refractometer lifting control system includes the following steps: Step 1: Start / Stop Determination. When the operator rotates the rotating sleeve 22, the controller assembly receives a pulse signal from the first photoelectric sensor 4. The controller assembly compares the timing of the dual signals to determine whether to rise or fall. If the number of pulse signals received within the set start time does not reach the set start threshold, the lifting assembly 3 will not start. If the number of pulse signals received within the set start time reaches the set start threshold, the lifting assembly 3 will start immediately, and then proceed to Step 2. Step 2: Speed ​​determination. The controller assembly controls the movement speed of the lifting component assembly 3 according to the frequency of the pulse signal. The higher the frequency, the faster the movement speed, and vice versa. Step 3: Operation continuity determination. If the controller assembly does not receive a connection pulse signal or receives a connection reverse pulse signal within the set reset time, the operation continuity is interrupted, and the process returns to Step 1. Step 4: Limit position determination. When the controller assembly receives the photoelectric signal from the second photoelectric sensor 332, the lifting assembly 3 immediately stops; when the controller assembly receives a reverse pulse signal, it starts the lifting assembly 3, otherwise it remains locked; when the controller assembly no longer receives the photoelectric signal from the second photoelectric sensor 332, it proceeds to step 1.

[0046] To further effectively filter out erroneous operations, the pulse signals received during the start-up time in step one are set to be continuous opposing pulse signals. If the signal interruption time exceeds the set start-up time or the received reverse pulse signal is received, the counting is restarted. Example

[0047] (I) Hardware Precision Design Assembly: The distance between the dual-channel photoelectric sensor and the grating disk is adjusted to 0.5±0.1mm to ensure signal stability.

[0048] Limiting component: The notch width of the notch baffle 331 is 1.3 times (±0.05mm tolerance) of the sensing area of ​​the second photoelectric sensor 332 to avoid detection blind spots.

[0049] Lifting drive: The lifting assembly 3 uses a trapezoidal lead screw made of 45# steel with hardening treatment, and the nut seat is equipped with a self-lubricating bushing to reduce backlash to ≤0.01mm.

[0050] (II) Software Parameter Configuration Start-up threshold: 16 edge dual-channel photoelectric sensors correspond to a handle rotation of 11.25°. Each gap is 360 / 128=2.8125°. Each gap corresponds to two edges. The 16 edges of the dual-channel photoelectric sensors correspond to 4 gaps, so the handle rotation is 11.25°.

[0051] Clock synchronization: Under a 40MHz clock, the start-up counting cycle is 25ns, and 16 counts correspond to a 400ns delay, matching the high-frequency characteristics of the handle jitter (≤100Hz).

[0052] Limit priority: The signal from the second photoelectric sensor 332 is directly connected to the enable terminal of the motor driver, and the hardware interrupt takes precedence over the software logic.

[0053] (III) Verification in Typical Scenarios Micro-shake filtering: Handle shake ≤10° (<4 gaps) → Start-up threshold not reached 16 edges → Motor stops, no action; Rapid lifting: Handle rotation ≥60° (>21 gaps) → Start-up threshold reached 16 edges → Motor starts immediately, response time <500μs; Limit protection: When the lifting reaches the limit, the notch baffle 331 no longer blocks the second photoelectric sensor 332, and the motor stops within 1ms.

[0054] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A computer-controlled optometry instrument lifting and control system, comprising an operating console assembly (1), a control handle assembly (2), a lifting component assembly (3), and a controller assembly, wherein the control handle assembly (2) and the lifting component assembly (3) are respectively mounted on the operating console assembly (1), and the control handle assembly (2) controls the lifting and lowering movement of the lifting component assembly (3) through the controller assembly; characterized in that: The control handle assembly (2) includes a central swing arm assembly (21), a rotating sleeve (22) and a grating disk assembly (23). The rotating sleeve (22) is rotatably fitted onto the outside of the central swing arm assembly (21), and the rotating sleeve (22) drives the grating disk assembly (23) to rotate. The grating disk assembly (23) is equipped with a first photoelectric sensor (4), which is fixedly installed on the table surface of the control panel assembly (1) and is connected to the controller assembly via signal.

2. The computer-controlled refractometer lifting and lowering control system according to claim 1, characterized in that: The bottom of the rotating sleeve (22) is fixedly connected to a driving ball shell (24). The driving ball shell (24) is a hollow structure with an open bottom. The outer surface of the driving ball shell (24) is provided with a positioning groove (241) extending along the same longitude direction. The grating disk assembly (23) is provided with a positioning pin (25) inside. One end of the positioning pin (25) is fixedly connected to the grating disk assembly (23), and the other end is located in the positioning groove (241).

3. The computer-controlled refractometer lifting and lowering control system according to claim 2, characterized in that: The center swing rod assembly (21) is provided with a mounting base assembly (26) at its bottom, and the center swing rod assembly (21) can be swing-through installed in the mounting base assembly (26); The mounting base assembly (26) is provided with a cylindrical flange (261), and the drive ball housing (24) sits on the cylindrical flange (261) through a bottom opening; The mounting base assembly (26) is provided with an upper cover plate (27), and the mounting base assembly (26) and the upper cover plate (27) are fixedly connected by a connecting column (28); The grating disk assembly (23) is rotatably connected to the upper cover plate (27) via a bearing (29).

4. The computer-controlled refractometer lifting and lowering control system according to claim 3, characterized in that: The inner surface of the driving spherical shell (24) is evenly distributed with inwardly protruding ribs (242) arranged along the longitude direction of the sphere.

5. The computer-controlled refractometer lifting and lowering control system according to claim 4, characterized in that: The cylindrical flange (261) has rounded corners at the outer diameter end.

6. The computer-controlled refractometer lifting and lowering control system according to claim 1, characterized in that: The lifting assembly (3) includes a lifting seat (31) and a lifting platform (32). A photoelectric limit component (33) is provided between the lifting seat (31) and the lifting platform (32). The photoelectric limit component (33) is signal connected to the controller assembly.

7. The computer-controlled refractometer lifting and lowering control system according to claim 6, characterized in that: The photoelectric limiting component (33) includes a notch baffle (331) and a second photoelectric sensor (332). The second photoelectric sensor (332) is fixedly installed on the lifting seat (31). The notch baffle (331) is fixedly installed on the lifting platform (32) in the vertical direction. When the notch baffle (331) blocks the optical path of the second photoelectric sensor (332), the lifting component assembly (3) works normally. The notch baffle (331) has a notch near the connection of the lifting platform (32). The length from the lower edge of the notch baffle (331) to the lower edge of the notch baffle (331) is the lifting stroke of the lifting platform.

8. The computer-controlled refractometer lifting and control system according to claim 1 or 7, characterized in that: The first photoelectric sensor (4) is a dual-channel photoelectric sensor. The grating disk assembly (23) has gaps evenly distributed along the circumference. The number of gaps is greater than or equal to 100. The phase difference of the dual-channel photoelectric sensor is 85°-95°.

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