阅读说明：本技术 基于移动升降式的眼科用视力测试装置 (Ophthalmic eyesight testing arrangement based on remove over-and-under type ) 是由 梁国宁 于 2021-08-16 设计创作，主要内容包括：本发明涉及视力测试技术领域,具体地说,涉及基于移动升降式的眼科用视力测试装置。其至少包括：支撑架、升降测试机构和距离限位机构,支撑架顶部嵌设有固定筒,固定筒顶部开设有开槽,升降测试机构包括收卷杆,收卷杆转动在固定筒内部,收卷杆端部转动伸出固定筒内部固定连接收卷转盘,收卷杆外壁缠绕设置有视力测试表,视力测试表端部固定连接在收卷杆外壁,视力测试表端部从开槽内部滑出固定筒内部固定连接有支撑板,支撑板底部边缘处安装有电动推杆,电动推杆的推杆端部固定连接支撑板底部,电动推杆底部嵌设在支撑架顶部,本发明方便视力测试表进行存储,可以调节测试高度,且可以对测试的距离进行测量。(The invention relates to the technical field of vision testing, in particular to a movable lifting type vision testing device for ophthalmology. It at least comprises: the invention provides a support frame, a lifting test mechanism and a distance limiting mechanism, wherein a fixed cylinder is embedded at the top of the support frame, a notch is formed in the top of the fixed cylinder, the lifting test mechanism comprises a winding rod, the winding rod rotates inside the fixed cylinder, the end part of the winding rod rotates to extend out of a fixed cylinder fixed connection winding turntable, an eyesight test meter is wound on the outer wall of the winding rod, the end part of the eyesight test meter is fixedly connected to the outer wall of the winding rod, the end part of the eyesight test meter slides out of a fixed cylinder fixedly connected with a support plate inside the notch, an electric push rod is installed at the edge of the bottom of the support plate, the end part of the electric push rod is fixedly connected with the bottom of the support plate, and the bottom of the electric push rod is embedded at the top of the support frame.)

1. Ophthalmic eyesight testing arrangement based on remove over-and-under type, its characterized in that includes at least:

the supporting frame comprises a supporting frame (100), wherein a fixed cylinder (110) is embedded in the top of the supporting frame (100), a slot (111) is formed in the top of the fixed cylinder (110), supporting legs (130) are arranged at the bottom of the supporting frame (100) close to corners, rubber suction cups (135) are communicated with the bottoms of the supporting legs (130), the rubber suction cups (135) are in a shape of a truncated cone, and a storage groove (120) is formed in the front surface of the supporting frame (100);

a lifting test mechanism (200), the lifting test mechanism (200) comprises a coiling rod (210), the winding rod (210) rotates inside the fixed cylinder (110), the end part of the winding rod (210) extends out of the fixed cylinder (110) and is fixedly connected with a winding turntable (211), the outer wall of the winding rod (210) is wound with a vision test chart (212), the end part of the vision test chart (212) is fixedly connected with the outer wall of the winding rod (210), the end part of the vision test meter (212) slides out of the inside of the slot (111) and is fixedly connected with a supporting plate (220) inside the fixed cylinder (110), an electric push rod (230) is arranged at the bottom edge of the supporting plate (220), the end part of the push rod of the electric push rod (230) is fixedly connected with the bottom of the supporting plate (220), the bottom of the electric push rod (230) is embedded at the top of the support frame (100);

apart from stop gear (300), apart from stop gear (300) including spacing (310), spacing (310) is fixed to be set up storage tank (120) inner chamber bottom center department, sliding opening (313) have been seted up to spacing (310) outer wall, spacing (310) inside rotation is provided with winding pole (311), winding pole (311) tip rotates and stretches out spacing (310) inside fixedly connected with winding carousel (312), winding pole (311) outer wall winding is provided with tape measure (320), tape measure (320) end fixing sets up winding pole (311) outer wall, tape measure (320) tip is followed sliding opening (313) is inside wears out spacing (310) inside fixedly connected with spacing (321), spacing (321) outer wall size is greater than sliding opening (313) inside size.

2. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 1, characterized in that: two symmetrical connecting plates (112) are arranged on two side walls of the groove (111), adjusting grooves (1121) are formed in the top of each connecting plate (112), two symmetrical brush plates (113) are arranged between the two adjusting grooves (1121) in a sliding mode, the vision test meter (212) is located between the two brush plates (113), and cleaning brushes (1134) are arranged on the inner surfaces of the brush plates (113) at equal intervals.

3. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 2, characterized in that: two symmetrical adjusting screw rods (1123) are rotatably arranged inside one of the adjusting grooves (1121), a power cavity (1122) is arranged at the center inside one of the adjusting grooves (1121), and the power cavity (1122) is located between the two adjusting screw rods (1123).

4. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 3, characterized in that: the end parts of the two adjusting screw rods (1123) are rotated to extend into a first bevel gear (1124) fixedly connected inside the power cavity (1122), a second bevel gear (1125) is connected between the two first bevel gears (1124) in a meshing mode, a connecting rod (1126) is fixedly connected to the end part of the second bevel gear (1125), and the end part of the connecting rod (1126) is rotated to extend out of an adjusting turntable (1127) fixedly connected inside the power cavity (1122).

5. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 4, characterized in that: brush board (113) all are provided with regulating plate (1131) near the bottom of tip, regulating plate (1131) outer wall size of dimension with the inside cross section size of dimension looks adaptation of adjustment groove (1121), regulating plate (1131) tip fixedly connected with flange (1132), flange (1132) slide and set up connecting plate (112) bottom, one of them regulating plate (1131) surface has seted up regulating screw hole (1133), regulating screw hole (1133) inside with regulating screw (1123) outer wall screw-thread fit connects.

6. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 1, characterized in that: the top of the inside of the supporting leg (130) is rotatably provided with a conveying screw (131), the outer wall of the conveying screw (131) close to the top is fixedly provided with a driven bevel gear (1310), the outer wall of the driven bevel gear (1310) is connected with a driving bevel gear (132) in a meshed mode, the end part of the driving bevel gear (132) is fixedly connected with a fixing rod (133), and the end part of the fixing rod (133) rotates to stretch out of the inside of the supporting leg (130).

7. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 6, characterized in that: the supporting leg (130) is inside to slide and is provided with piston board (134), piston board (134) outer wall is provided with limiting plate (1340), limiting plate (1340) slide supporting leg (130) inner wall, piston board (134) with the inside looks adaptation of supporting leg (130), piston board (134) surface center department with transfer screw (131) outer wall screw-thread fit connects.

8. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 1, characterized in that: the top of the supporting plate (220) is provided with a storage cavity (221), a partition plate (222) is arranged in the storage cavity (221), and the partition plate (222) is fixedly connected with the inner wall of the storage cavity (221).

9. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 1, characterized in that: the utility model discloses a storage tank, including gag lever post (321), gag lever post (331), seat (330) are fixed to be provided with flexible leg (331) respectively at gag lever post (321) both ends, flexible leg (331) top, seat (330) are "cuboid" form, the equal fixedly connected with of corner is close to in seat (330) bottom is flexible leg (331), seat (330) with flexible leg (331) are located inside storage tank (120).

10. An ophthalmic vision testing device based on a mobile lifting/lowering type according to claim 9, characterized in that: flexible leg (331) include foundation (3311), foundation (3311) inside slip is provided with movable post (3312), activity post (3312) tip roll-off foundation (3311) inside fixed connection seat (330) bottom, the outer wall threaded connection that foundation (3311) is close to the top has extrusion screw rod (3313), extrusion screw rod (3313) tip screw thread penetrates foundation (3311) inside activity post (3312) outer wall of closely laminating.

Technical Field

The invention relates to the technical field of vision testing, in particular to a movable lifting type vision testing device for ophthalmology.

Background

Ophthalmology is a study and takes place in the visual system, including eyeball and the discipline of the relevant disease of its associated tissue, the patient need use the visual test device to test patient's eyesight often when ophthalmic is examined, the visual test table of using is posted on the wall at present, make the patient keep certain distance to watch the visual test table and test patient's eyesight, but the visual test table exposes in the external world for a long time and not only corrodes the damage easily, and inconvenient regulation height, make patient's visual test limitation great, and the distance that the patient reaches the visual test table can not accurate the determination, lead to the visual test to have the error, be not convenient for subsequent treatment, in view of this, we propose based on removing the ophthalmic visual test device of over-and-under type.

Disclosure of Invention

The invention aims to provide an ophthalmic vision testing device based on a movable lifting type, so as to solve the problems in the background technology.

In order to achieve the above object, the present invention provides an ophthalmic vision testing device based on a movable lifting type, which at least comprises:

the supporting device comprises a supporting frame, wherein a fixed cylinder is embedded in the top of the supporting frame, a groove is formed in the top of the fixed cylinder, supporting legs are arranged at the bottom of the supporting frame close to corners, rubber suckers are communicated with the bottoms of the supporting legs and are in a shape of a truncated cone, and a storage groove is formed in the front surface of the supporting frame;

when the support frame in this embodiment is used specifically, extrude rubber suction cup subaerial, extrude the air of rubber suction cup bottom, make rubber suction cup adsorb subaerial, the support frame is being supported more steadily to the supporting leg.

The lifting testing mechanism comprises a winding rod, the winding rod rotates inside the fixed cylinder, the end part of the winding rod rotates to extend out of the fixed cylinder and is fixedly connected with a winding turntable, the outer wall of the winding rod is wound with a vision test meter, the end part of the vision test meter is fixedly connected with the outer wall of the winding rod, the end part of the vision test meter slides out of the inside of the slot, a supporting plate is fixedly connected inside the fixed cylinder, an electric push rod is installed at the edge of the bottom of the supporting plate, the end part of the push rod of the electric push rod is fixedly connected with the bottom of the supporting plate, and the bottom of the electric push rod is embedded at the top of the supporting frame;

the lift accredited testing organization in this embodiment is when specifically using, by electric putter's push rod tip up-and-down motion, thereby drive backup pad up-and-down motion, thereby drive eyesight test table tip up-and-down motion, drive eyesight test table along the rolling rod outer wall roll-off, make eyesight test table content stretch out fixed section of thick bamboo inside completely, carry out eyesight test, when not using, by electric putter's push rod tip downstream, hold the rolling carousel and rotate simultaneously with this, can drive the rolling rod and rotate inside fixed section of thick bamboo, slip the winding at the rolling rod outer wall from the fluting inside to eyesight test table along the rolling rod outer wall, make eyesight test table be located fixed section of thick bamboo inside completely and store.

Apart from stop gear, apart from stop gear includes spacing, spacing is fixed to be set up storage tank inner chamber bottom center department, the sliding opening has been seted up to the spacing outer wall, the inside rotation of spacing is provided with the winding pole, the winding pole tip rotates and stretches out the inside fixedly connected with winding carousel of spacing, the winding pole outer wall winding is provided with the tape measure, the tape measure end fixing sets up the winding pole outer wall, the tape measure tip is followed the inside wearing out of sliding opening the inside fixedly connected with gag lever post of spacing, gag lever post outer wall size is greater than the inside size of dimension of sliding opening.

Distance stop gear in this embodiment when specifically using, pulls the tape measure tip, can make the tape measure along winding pole outer wall from the sliding port roll-off, drives the winding pole and rotates, measures the distance of patient to the eyesight test table through the tape measure, ensures that the distance of eyesight test is accurate, confirms the back at the distance, can hold the winding carousel and rotate, drives the winding pole and rotates, makes the tape measure along the winding pole outer wall winding, and the tape measure is located spacing frame inside and stores.

As a further improvement of the technical scheme, the two side walls of the groove are provided with two symmetrical connecting plates, the top of each connecting plate is provided with an adjusting groove, two brush plates which are symmetrical are arranged between the adjusting grooves in a sliding mode, the vision test meters are arranged between the brush plates, and cleaning brushes are arranged on the inner surfaces of the brush plates at equal intervals.

As a further improvement of the technical scheme, two symmetrical adjusting screw rods are rotatably arranged in one of the adjusting grooves, a power cavity is arranged at the center of the inner part of one of the adjusting grooves, and the power cavity is positioned between the two adjusting screw rods.

As a further improvement of the technical scheme, the end part of the adjusting screw rod rotates to stretch into a first bevel gear fixedly connected with the inside of the power cavity, a second bevel gear is meshed between the first bevel gear, a connecting rod is fixedly connected with the end part of the second bevel gear, and the end part of the connecting rod rotates to stretch out the adjusting turntable fixedly connected with the inside of the power cavity.

As a further improvement of the technical scheme, the bottom that the brush board is close to the tip all is provided with the regulating plate, regulating plate outer wall size of a dimension with regulating groove inside cross section size of a dimension looks adaptation, regulating plate tip fixedly connected with flange, the flange slides and sets up connecting plate bottom, one of them regulating plate surface has seted up the adjusting wire hole, adjusting wire downthehole portion with adjusting screw outer wall screw-thread fit connects.

As a further improvement of the technical scheme, the top of the inside of the supporting leg is rotatably provided with a conveying screw, the conveying screw is fixedly provided with a driven bevel gear close to the outer wall of the top, the outer wall of the driven bevel gear is meshed with a driving bevel gear, the end part of the driving bevel gear is fixedly connected with a fixing rod, and the end part of the fixing rod is rotatably extended out of the inside of the supporting leg.

As a further improvement of the technical scheme, a piston plate is arranged inside the supporting leg in a sliding mode, a limiting plate is arranged on the outer wall of the piston plate, the limiting plate slides on the inner wall of the supporting leg, the piston plate is matched with the inside of the supporting leg in a matching mode, and the center of the surface of the piston plate is connected with the outer wall of the conveying screw in a threaded fit mode.

As a further improvement of the technical scheme, the top of the supporting plate is provided with a storage cavity, the inner part of the storage cavity is provided with a partition plate, and the partition plate is fixedly connected with the inner wall of the storage cavity.

As a further improvement of the technical scheme, the two ends of the limiting rod are respectively provided with a telescopic leg, the top of each telescopic leg is fixedly provided with a seat plate, the seat plate is in a cuboid shape, the bottom of the seat plate is close to the telescopic legs fixedly connected with the corners, and the seat plate and the telescopic legs are located inside the storage tank.

As a further improvement of the technical scheme, the telescopic legs comprise bottom columns, movable columns are arranged inside the bottom columns in a sliding mode, the ends of the movable columns slide out of the bottoms of the fixed connection seat plates inside the bottom columns, the outer walls of the bottom columns, close to the tops, are in threaded connection with extrusion screws, and threads at the ends of the extrusion screws penetrate into the outer walls of the bottom columns, which are tightly attached inside the bottom columns.

Compared with the prior art, the invention has the beneficial effects that:

1. in this ophthalmic eyesight test device based on remove over-and-under type, through setting up lift accredited testing organization, push rod tip up-and-down motion by electric putter, thereby drive backup pad up-and-down motion, thereby drive eyesight test table tip up-and-down motion, drive eyesight test table along the rolling rod outer wall roll-off, make eyesight test table content stretch out fixed section of thick bamboo completely inside, conveniently carry out eyesight test, when not using, by electric putter's push rod tip downstream, then the rolling rod rotates, slip winding at the rolling rod outer wall from fluting inside the eyesight test table along the rolling rod outer wall, make eyesight test table be located fixed section of thick bamboo completely and store, be favorable to protecting eyesight test table, avoid exposing for a long time and damage in the air, be favorable to increase of service life.

2. In this ophthalmic eyesight test device based on remove over-and-under type, through setting up apart from stop gear, pull tape measure tip, can make the tape measure along the winding pole outer wall from the sliding opening roll-off, drive the winding pole and rotate, conveniently use the tape measure to measure the distance of eyesight test, make the patient more accurate to the distance of eyesight test table, be favorable to improving the effect of eyesight test, the practicality is stronger.

3. In this ophthalmic eyesight test device based on remove over-and-under type, through setting up the brush board, make the brush board slide between the adjustment tank of two symmetries, make the clearance brush tip of two brush inboard surfaces hug closely the eyesight test table surface, can make clearance brush tip laminating eyesight test table brush when the eyesight test table slides inside the fluting, can brush the dust on eyesight test table surface, avoid the dust to corrode the eyesight test table, improve life.

4. In this ophthalmic eyesight test device based on remove over-and-under type, through setting up rubber suction cup, when transfer screw rotates, can make the piston plate surface slide along the screw thread of transfer screw outer wall to it slides to drive the piston plate inside the supporting leg, during the piston plate upwards slides, can be inside the inside gas suction supporting leg of rubber suction cup, can firmly adsorb rubber suction cup subaerial, further ensures the fixed stability on rubber suction cup and ground, guarantees the stability of eyesight test.

5. In this ophthalmic eyesight test device based on remove over-and-under type, through setting up the seat, when dragging the gag lever post and drive the tape measure and slide, can make the seat take out from the storage tank inside, make the seat remove certain distance along with the tape measure, flexible leg supports subaerial, and the patient can sit and carry out the eyesight test at the seat top, and is more light comfortable when making the patient eyesight test.

Drawings

FIG. 1 is a first schematic view of the overall structure of embodiment 1;

FIG. 2 is a second drawing showing the overall structure of embodiment 1;

FIG. 3 is a schematic view of the supporting frame of embodiment 1;

FIG. 4 is a schematic view of the structure of the connection plate of embodiment 1;

FIG. 5 is an exploded view of the connecting plate of embodiment 1;

FIG. 6 is a schematic view of a brush plate structure according to example 1;

FIG. 7 is a cut view of the support leg structure of example 1;

FIG. 8 is a schematic structural view of the elevating test mechanism according to embodiment 1;

FIG. 9 is a schematic structural view of a support plate according to embodiment 1;

FIG. 10 is a schematic structural view of a distance-limiting mechanism according to embodiment 1;

FIG. 11 is a cut-away view of the structure of the stop frame according to example 1;

FIG. 12 is a schematic view of a seat structure of embodiment 1;

fig. 13 is a schematic structural view of the extendable leg of embodiment 1.

The various reference numbers in the figures mean:

100. a support frame; 110. a fixed cylinder; 111. grooving; 112. a connecting plate; 1121. an adjustment groove; 1122. a power cavity; 1123. adjusting the screw rod; 1124. a first bevel gear; 1125. a second bevel gear; 1126. a connecting rod; 1127. adjusting the turntable; 113. brushing the board; 1131. an adjusting plate; 1132. a convex plate; 1133. adjusting the screw hole; 1134. cleaning the brush; 120. a storage tank; 130. supporting legs; 131. a transfer screw; 1310. a driven bevel gear; 132. a driving bevel gear; 133. fixing the rod; 134. a piston plate; 1340. a limiting plate; 135. a rubber suction cup;

200. a lifting test mechanism; 210. winding the rod; 211. rolling a turntable; 212. a vision test chart; 220. a support plate; 221. a storage chamber; 222. a partition plate; 230. an electric push rod;

300. a distance limiting mechanism; 310. a limiting frame; 311. a winding rod; 312. winding the turntable; 313. a sliding port; 320. a tape measure; 321. a limiting rod; 330. a seat plate; 331. a telescopic leg; 3311. a bottom pillar; 3312. a movable post; 3313. the screw is extruded.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 to 13, the present embodiment provides a mobile lifting type based vision testing device for ophthalmology, which includes at least:

the supporting frame 100, a fixed cylinder 110 is embedded at the top of the supporting frame 100, a slot 111 is formed at the top of the fixed cylinder 110, supporting legs 130 are arranged at the bottom of the supporting frame 100 close to corners, the supporting frame 100 can be supported on the ground through the four supporting legs 130, the use stability of the supporting frame 100 is guaranteed, rubber suckers 135 are communicated at the bottoms of the supporting legs 130, the rubber suckers 135 are in a shape of a truncated cone, the rubber suckers 135 are supported and extruded on the ground, air at the bottoms of the rubber suckers 135 can be extruded out, the rubber suckers 135 are enabled to be adsorbed on the ground, the supporting frame 100 is guaranteed to be supported by the supporting legs 130 more stably, the practicability is stronger, and a storage groove 120 is formed in the front surface of the supporting frame 100;

when the support frame 100 in this embodiment is used specifically, the rubber suction cup 135 is pressed on the ground, and the air at the bottom of the rubber suction cup 135 is squeezed out, so that the rubber suction cup 135 is adsorbed on the ground, and the support leg 130 supports the support frame 100 more stably.

The lifting testing mechanism 200 comprises a winding rod 210, the winding rod 210 rotates inside a fixed cylinder 110, the end part of the winding rod 210 extends out of the fixed cylinder 110 and is fixedly connected with a winding turntable 211, the winding turntable 211 is held to rotate, the winding rod 210 can be driven to rotate inside the fixed cylinder 110, the operation is convenient, the outer wall of the winding rod 210 is wound with a vision test meter 212, the end part of the vision test meter 212 is fixedly connected with the outer wall of the winding rod 210, the end part of the vision test meter 212 slides out of the fixed cylinder 110 from the inside of a slot 111 and is fixedly connected with a supporting plate 220, the edge of the bottom of the supporting plate 220 is provided with an electric push rod 230, the end part of the push rod 230 is fixedly connected with the bottom of the supporting plate 220, the bottom of the electric push rod 230 is embedded at the top of the supporting frame 100, the electric push rod 230 is powered on to work, the end part of the push rod of the electric push rod 230 moves up and down, so as to drive the supporting plate 220 to move up and down, thereby driving the end of the vision test meter 212 to move up and down, driving the vision test meter 212 to slide out along the outer wall of the winding rod 210, so that the content of the vision test meter 212 completely extends out of the interior of the fixed cylinder 110, facilitating the vision test, when not in use, the end of the push rod of the electric push rod 230 moves downwards, then the winding rod 210 rotates, sliding the vision test meter 212 from the interior of the slot 111 along the outer wall of the winding rod 210 and winding on the outer wall of the winding rod 210, so that the vision test meter 212 is completely positioned in the fixed cylinder 110 for storage, being beneficial to protecting the vision test meter 212, avoiding damage caused by long-time exposure in the air, and being beneficial to prolonging the service life;

the lift accredited testing organization 200 in this embodiment is when specifically using, by electric putter 230's push rod tip up-and-down motion, thereby drive backup pad 220 up-and-down motion, thereby drive eyesight test table 212 tip up-and-down motion, drive eyesight test table 212 along the roll-up bar 210 outer wall roll-off, make eyesight test table 212 content stretch out the solid fixed cylinder 110 inside completely, carry out eyesight test, when not using, by electric putter 230's push rod tip downstream, hold the rolling carousel 211 simultaneously and rotate, can drive roll-up bar 210 and rotate inside solid fixed cylinder 110, roll up the eyesight test table 212 along the roll-up bar 210 outer wall from the inside winding of fluting 111, make eyesight test table 212 be located solid fixed cylinder 110 inside and store.

The distance limiting mechanism 300 comprises a limiting frame 310, the limiting frame 310 is fixedly arranged at the center of the bottom of an inner cavity of the storage tank 120, a sliding opening 313 is formed in the outer wall of the limiting frame 310, a winding rod 311 is rotatably arranged in the limiting frame 310, the end part of the winding rod 311 is rotatably extended out of the limiting frame 310 and is fixedly connected with a winding turntable 312, the winding turntable 312 is held to rotate, so that the winding rod 311 can be driven to rotate, the operation is convenient, a tape 320 is wound on the outer wall of the winding rod 311, the end part of the tape 320 is fixedly arranged on the outer wall of the winding rod 311, the end part of the tape 320 penetrates out of the limiting frame 310 from the inside of the sliding opening 313 and is fixedly connected with a limiting rod 321, the end part of the tape 320 is pulled, the tape 320 can slide out from the sliding opening 313 along the outer wall of the winding rod 311 to drive the winding rod 311 to rotate, the distance of a vision test table 212 can be conveniently measured by using the tape 320, and the distance from a patient to the vision test table 212 is more accurate, the visual test device has the advantages that the visual test effect is favorably improved, the practicability is stronger, the size of the outer wall of the limiting rod 321 is larger than the size of the inner size of the sliding opening 313, the end part of the tape measure 320 can be limited by arranging the limiting rod 321, the limiting rod 321 is conveniently pulled to drive the sliding opening 313 of the end part of the tape measure 320 to slide out, and the structural integrity is guaranteed.

When the distance limiting mechanism 300 in this embodiment is used specifically, the end of the tape 320 is pulled, the tape 320 can slide out from the sliding opening 313 along the outer wall of the winding rod 311, the winding rod 311 is driven to rotate, the distance from a patient to the vision test chart 212 is measured through the tape 320, the distance of a vision test is ensured to be accurate, after the distance is determined, the winding turntable 312 can be held to rotate, the winding rod 311 is driven to rotate, the tape 320 is wound along the outer wall of the winding rod 311, and the tape 320 is located inside the limiting frame 310 to be stored.

In this embodiment, two symmetrical connecting plates 112 are disposed on two side walls of the slot 111, an adjusting slot 1121 is disposed at the top of the connecting plate 112, two symmetrical brush plates 113 are slidably disposed between the two adjusting slots 1121, the vision test table 212 is disposed between the two brush plates 113, and cleaning brushes 1134 are disposed on the inner surfaces of the brush plates 113 at equal intervals, so that the brush plates 113 slide between the two symmetrical adjusting slots 1121, the end portions of the cleaning brushes 1134 on the inner surfaces of the two brush plates 113 are tightly attached to the surface of the vision test table 212, when the vision test table 212 slides in the slot 111, the end portions of the cleaning brushes 1134 are attached to the vision test table 212 to be brushed, dust on the surface of the vision test table 212 can be brushed off, the vision test table 212 is prevented from being corroded by dust, and the service life of the vision test table is prolonged.

Two symmetrical adjusting screw rods 1123 are rotatably arranged inside one of the adjusting grooves 1121, a power cavity 1122 is arranged at the center inside one of the adjusting grooves 1121, and the power cavity 1122 is located between the two adjusting screw rods 1123.

It is worth to be noted that the end portions of the two adjusting screw rods 1123 are rotatably extended into the power cavity 1122 and fixedly connected with a first bevel gear 1124, a second bevel gear 1125 is engaged and connected between the two first bevel gears 1124, the end portion of the second bevel gear 1125 is fixedly connected with a connecting rod 1126, the end portion of the connecting rod 1126 is rotatably extended out of the power cavity 1122 and fixedly connected with an adjusting turntable 1127, the adjusting turntable 1127 is held to rotate, so that the connecting rod 1126 can be driven to rotate, the second bevel gear 1125 is engaged to drive the two first bevel gears 1124 to rotate, and therefore the two adjusting screw rods 1123 are simultaneously rotated inside one of the adjusting grooves 1121, and the operation is convenient.

Concretely, the bottom that the brush board 113 is close to the tip all is provided with regulating plate 1131, regulating plate 1131 outer wall size of dimension and the inside cross section size of regulation groove 1121 looks adaptation, regulating plate 1131 tip fixedly connected with flange 1132, flange 1132 slides and sets up in connecting plate 112 bottom, can carry on spacingly to regulating plate 1131 through flange 1132, avoid regulating plate 1131 to break away from regulation groove 1121 is inside, regulating screw hole 1133 has been seted up on one of them regulating plate 1131 surface, regulating screw hole 1133 is inside to be connected with regulating screw 1123 outer wall screw-thread fit, when regulating screw 1123 rotates, make the inside screw thread slip along regulating screw 1123 outer wall of regulating screw hole 1133 on one of them regulating plate 1131 surface, and convenient for operation, conveniently adjust and clear up the distance of brush 1134 tip to eyesight test table 212 surface.

Further, the inside top of supporting leg 130 is rotated and is provided with transfer screw 131, transfer screw 131 is close to the fixed driven bevel gear 1310 that is provided with of outer wall at top, driven bevel gear 1310 outer wall meshing is connected with initiative bevel gear 132, initiative bevel gear 132 tip fixedly connected with dead lever 133, dead lever 133 tip rotates inside stretching out supporting leg 130, it rotates to hold dead lever 133 tip, thereby can drive initiative bevel gear 132 and rotate, make driven bevel gear 1310 outer wall meshing rotate, it is more light convenient inside supporting leg 130 to drive transfer screw 131 to rotate.

Specifically, a piston plate 134 is slidably disposed inside the supporting leg 130, a limit plate 1340 is disposed on the outer wall of the piston plate 134, the limit plate 1340 slides on the inner wall of the supporting leg 130, the piston plate 134 is adapted to the inside of the supporting leg 130, the center of the surface of the piston plate 134 is in threaded fit with the outer wall of the conveying screw 131, when the conveying screw 131 rotates, the surface of the piston plate 134 can slide along the threads on the outer wall of the conveying screw 131, so as to drive the piston plate 134 to slide inside the supporting leg 130, when the piston plate 134 slides upwards, the gas inside the rubber suction cup 135 can be sucked into the inside of the supporting leg 130, the rubber suction cup 135 can be firmly adsorbed on the ground, the fixation and stability of the rubber suction cup 135 and the ground can be further ensured, the supporting frame 100 supported by the supporting leg 130 is more stable, the stability of the vision test is ensured, when the piston plate 134 slides downwards, the air inside the supporting leg 130 can be squeezed into the rubber suction cup 135, the rubber suction cup 135 is enabled to form a gap with the ground, the rubber suction cup 135 is conveniently taken down from the ground, and the structural integrity is guaranteed.

Further, backup pad 220 top is provided with storing chamber 221, can store article inside storing chamber 221, and the make full use of resource, the practicality is stronger, and storing chamber 221 is inside to be provided with division board 222, and division board 222 and storing chamber 221 inner wall fixed connection separate into a plurality of spaces storing chamber 221 is inside through division board 222, make things convenient for the classified storage article, and the practicality is stronger.

In addition, gag lever post 321 both ends are provided with flexible leg 331 respectively, the fixed seat 330 that is provided with in flexible leg 331 top, seat 330 is "cuboid" form, seat 330 bottom is close to the equal fixedly connected with flexible leg 331 of corner, seat 330 and flexible leg 331 are located the storage tank 120 inside, when dragging gag lever post 321 and driving tape measure 320 and slide, can make seat 330 take out from the storage tank 120 inside, make seat 330 along with tape measure 320 removes certain distance, flexible leg 331 supports subaerial, the patient can sit and carry out the visual acuity test at seat 330 top, it is more light comfortable when making patient's visual acuity test.

Specifically, flexible leg 331 includes sill post 3311, the inside slip of sill post 3311 is provided with movable post 3312, the inside fixed connection seat 330 bottom of movable post 3312 tip roll-off sill post 3311, push-and-pull sill post 3311, make movable post 3312 tip slide from top to bottom in sill post 3311 is inside, conveniently adjust movable post 3312 and stretch out the inside length of sill post 3311, thereby adjust the length of flexible leg 331, adjust the height that seat 330 supported subaerial, conveniently adjust the height of sitting down the rest according to the patient of different heights, it is more comfortable to make the patient, the outer wall threaded connection that sill post 3311 is close to the top has extrusion screw 3313, extrusion screw 3313 tip screw penetrates the inside activity post 3312 outer wall that closely laminates of sill post 3311, can extrude fixed movable post 3312, spacing fixing of activity post 3312 inside sill post 3311, guarantee structural integrity.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.