Optometry unit

Abstract

The utility model relates to an optometry unit which comprises a base, the base is provided with a front-back operation assembly for controlling a machine frame part to move front and back, the front-back operation assembly comprises a motor for providing rotating power, the motor is fixed on a guide rail seat through a motor support, the motor is connected with a screw rod, and the screw rod is connected with the machine frame part. The screw is fixed to the upper surface of the sliding block through a screw sleeve, guide wheels are arranged on the two sides of the lower bottom face of the sliding block, cylindrical shafts are arranged on the two side faces of the guide rail base, and the guide wheels roll and run in the mode of being tightly attached to the cylindrical shafts. The guide wheels are arranged on the two sides of the lower bottom face of the sliding block, the cylindrical shafts are arranged on the two side faces of the guide rail base, and the guide wheels roll and run in the mode of being tightly attached to the cylindrical shafts. The external double-axis linear guide rail replaces a traditional linear bearing, and is not hot during high-speed operation, stable in operation, low in noise and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of ophthalmic medical testing equipment, in particular to an optometry instrument. Background Art

[0002] The ophthalmometer emits a beam of infrared light of a specific wavelength, which passes through the cornea, lens, aqueous humor, retina and other eye organs, and finally projects onto the retina of the eye. It is then reflected back to the corresponding optical system of the instrument and then received by the CCD. The light signal is converted into an electrical signal, and the data such as the spherical lens, cylindrical lens and axial position are decomposed to obtain parameters such as the refractive power of the eye being examined.

[0003] During measurement, the operator controls the movement of the instrument forward, backward, left, right, up and down by hand, captures the pupil of the subject's eye, aligns with the pupil of the eyeball, presses the measurement key, and the measurement result will be displayed on the screen.

[0004] Chinese Patent Publication (Announcement) No.: CN103690145B, Patent Title: A Computerized Ophthalmometer, which discloses that "the forward and backward moving component includes a forward and backward moving base plate and a stepping motor, the forward and backward moving base plate is provided with a forward and backward moving mandrel, a forward and backward translation screw and a forward and backward moving seat, both ends of the front linear bearing seat in the forward and backward moving seat are provided with linear bearings, a linear bearing is provided in the rear linear bearing seat, and the linear bearings distributed in a trapezoidal shape are sleeved in the forward and backward moving mandrel...", it achieves the purpose of forward and backward movement by selecting a linear bearing and a cylindrical shaft for use in combination.

[0005] Since the small balls inside the linear bearing have a relatively poor load-bearing capacity, and due to the characteristics of the linear bearing, it vibrates and makes a lot of noise during movement, so this structure has room for further improvement. Summary of the invention

[0006] The purpose of the utility model is to provide an optometry instrument to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the utility model is achieved through the following technical measures: an ophthalmometer, including a base, on which a forward and backward running component for controlling the forward and backward movement of a frame part is arranged, wherein the forward and backward running component includes a motor providing rotational power, the motor is fixed to a guide rail seat through a motor bracket, the motor is connected to a screw, and the screw is fixed to the upper surface of a slider through a screw sleeve, guide wheels are arranged on both sides of the lower bottom surface of the slider, and cylindrical shafts are arranged on both side surfaces of the guide rail seat, and the guide wheels roll and operate close to the cylindrical shaft.

[0008] Compared with the prior art, the utility model has the advantages that: by setting guide wheels on both sides of the bottom surface of the slider, setting cylindrical shafts on both sides of the guide rail seat, the guide wheels roll closely against the cylindrical shafts. This external dual-axis linear guide replaces the traditional linear bearing, does not get hot when running at high speed, runs stably, has low noise, and has a long service life.

[0009] As an improvement of the utility model, the guide rail seat is a frame structure, and threaded holes are arranged on both inner sides of the frame. The purpose of selecting this design is that the frame structure can ensure the working strength of the guide rail seat, and at the same time, threaded holes can be arranged in the gaps thereof, and the matching clearance between the cylindrical shaft and the guide wheel can be adjusted by positioning bolts.

[0010] As an improvement of the utility model, the two sides of the guide rail seat are provided with arc grooves, and the cylindrical shaft can be placed vertically in the arc grooves, but can be wrapped by the arc grooves horizontally and will not fall out. The purpose of selecting this design is that the arc groove can wrap the cylindrical shaft and prevent it from falling out, and then fix the cylindrical shaft with positioning bolts to form a linear guide rail.

[0011] As an improvement of the utility model, the guide wheel is a U-shaped single wheel. The purpose of selecting this design is: the U-shaped surface is a concave surface, and the cylindrical shaft is a convex surface. The two cooperate with each other, with a large contact area, uniform force, stable operation, low noise, and no heat. The U-shaped single wheel is fixed by the central axis and the slider inside it, and there will be no interference on the side. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0013] In the attached picture:

[0014] Figure 1 It is a stereoscopic diagram of the front and rear running components described in the utility model.

[0015] Figure 2 This is a schematic diagram of the position of the front and rear running components described in the utility model in the ophthalmometer.

[0016] Figure 3 It is a three-dimensional diagram of the guide rail seat described in the utility model.

[0017] Figure 4 This is an assembly diagram of the guide rail seat and the cylindrical shaft described in the utility model.

[0018] Description of the reference numerals: 1. Base; 2. Frame part; 3. Front and rear running assembly; 4. Motor; 5. Motor bracket; 6. Guide rail seat; 7. Screw; 8. Screw sleeve; 9. Slide block; 10. Guide wheel; 11. Cylindrical shaft; 12. Threaded hole; 13. Arc groove; 14. Positioning bolt. Detailed implementation manners

[0019] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model.

[0020] Embodiment 1

[0021] Please refer to Figure 1 -4. An optometer provided in this embodiment includes a base 1. A front and rear running assembly 3 for controlling the front and rear movement of the frame part 2 is arranged on the base 1. The front and rear running assembly 3 includes a motor 4 that provides rotational power. The motor 4 is fixed on a guide rail seat 6 through a motor bracket 5. The motor 4 is connected with a screw 7. The screw 7 is fixed on the upper surface of a slide block 9 through a screw sleeve 8. Guide wheels 10 are arranged on both sides of the lower bottom surface of the slide block 9. Cylindrical shafts 11 are arranged on both side surfaces of the guide rail seat 6. During operation, the guide wheels 10 roll closely along the cylindrical shafts 11.

[0022] In the embodiment of the present utility model application, please refer to Figure 3 , the guide rail seat 6 is of a frame structure, in the shape of a "mu" character. Three threaded holes 12 are arranged on each of the two inner sides of the frame. The frame structure can ensure the working strength of the guide rail seat 6. At the same time, threaded holes 12 are arranged in its gaps, and the cooperation clearance between the cylindrical shaft 11 and the guide wheel 10 is adjusted through positioning bolts 14. Arc grooves 13 (occupying most of a circle) are arranged on both side surfaces of the guide rail seat 6. The cylindrical shaft 11 can be vertically placed into the arc grooves 13, but it can be horizontally wrapped by the arc grooves 13 and will not fall out. Then, three positioning bolts 14 are used to顶住 the cylindrical shaft 11 and fix it to form a linear guide rail.

[0023] In the embodiment of the present utility model application, the guide wheel 10 is a U-shaped single wheel. Since the U-shaped surface is a concave surface and the cylindrical shaft 11 is a convex surface, when the two cooperate, the contact area is large, the force is evenly distributed, the operation is stable, the noise is small, and it does not get hot. The central shaft of the U-shaped single wheel is a stud. After being screwed into the slide block 9, it is fixed tightly through a nut. For the U-shaped single wheel with this structure, there will be no interference contact phenomenon with other parts beside it.

[0024] The ophthalmometer provided in this embodiment is used normally by setting guide wheels 10 on both sides of the bottom surface of the slider 9 and setting cylindrical shafts 11 on both sides of the guide rail seat 6, and the guide wheels 10 roll closely against the cylindrical shafts 11. This external dual-axis linear guide replaces the traditional linear bearing, does not get hot when running at high speed, runs stably with low noise, and has a long service life.

[0025] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An ophthalmometer, comprising a base (1), on which a forward and backward movement assembly (3) for controlling the forward and backward movement of a frame portion (2) is arranged, wherein: The forward and backward running component (3) comprises a motor (4) for providing rotational power, the motor (4) being fixed on a guide rail seat (6) via a motor bracket (5), the motor (4) being connected to a screw rod (7), the screw rod (7) being fixed on the upper surface of a slider (9) via a screw rod sleeve (8), guide wheels (10) being arranged on both sides of the lower bottom surface of the slider (9), cylindrical shafts (11) being arranged on both sides of the guide rail seat (6), and the guide wheels (10) rollingly running close to the cylindrical shafts (11).

2. The ophthalmometer according to claim 1, characterized in that: The guide rail seat (6) is a frame structure, and threaded holes (12) are arranged on two inner sides of the frame.

3. The ophthalmometer according to claim 1, characterized in that: The two side surfaces of the guide rail seat (6) are provided with arc grooves (13), and the cylindrical shaft (11) can be placed vertically into the arc grooves (13), but can be wrapped by the arc grooves (13) horizontally and will not fall out.

4. The ophthalmometer according to claim 1, characterized in that: The guide wheel (10) is a U-shaped single wheel.

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