CN113030125B

CN113030125B - Resin lens surface defect detection device

Info

Publication number: CN113030125B
Application number: CN202110294020.4A
Authority: CN
Inventors: 马玉莹; 张家骅; 陈嘉凯
Original assignee: Wuxi Institute of Arts and Technology
Current assignee: Wuxi Institute of Arts and Technology
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2023-01-03
Anticipated expiration: 2041-03-19
Also published as: CN113030125A

Abstract

The invention discloses a resin lens surface defect detection device, and belongs to the technical field of resin defect detection. The resin lens surface defect detection device comprises a detection shell and a rotating mechanism, wherein a placing frame is installed inside the detection shell, a detection device is installed inside the placing frame, a protection shell is tightly welded on the surface of one side of the rotating mechanism, a rotating column is arranged inside the rotating mechanism, a fixed block is tightly welded at the bottom of the rotating column, translation mechanisms are tightly connected to two sides of the fixed block, and a clamping mechanism is slidably installed inside the translation mechanisms; the invention solves the problems that the resin lenses with specific sizes can only be clamped and the detection work efficiency is low because the resin lenses need to be taken and detected one by one manually, the labor is consumed.

Description

Resin lens surface defect detection device

Technical Field

The invention relates to the technical field of resin defect detection, in particular to a resin lens surface defect detection device.

Background

After the resin lenses are produced, workers need to detect produced products, batch defective products are prevented, in the detection process, the resin lenses are placed on a table top, diffuse reflection occurs under the action of a side light source according to flaws, the principle of generating bright light spots or bright light bands is generated, whether surface defects such as scratches exist on edges and surfaces are carefully detected, the working cycle of a detection device is not more than 5 s/piece, at present, in the detection process of the resin lenses, the lenses need to be manually taken, fingerprints and stains are easy to remain on the surfaces of the lenses, scratches on the surfaces of the lenses are influenced, the detection time of the single lenses is prolonged, therefore, how to set an automatic taking device is important to improve the detection efficiency, a translation mechanism and a rotating mechanism are added in the device after the device is achieved, a machine can be adjusted to clamp the lenses with different diameters, labor force is saved, the application range of the device can be increased while the efficiency is improved, and accordingly, the resin lens surface defect detection device is provided.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to provide a resin lens surface defect detection device, which solves the problems in the prior art:

the defect of the surface flaw of the existing resin lens is detected by manually taking the defect one by one, fingerprints and stains are easily left on the surface of the lens, the detection of the lens is influenced, or the resin lens with a fixed diameter can only be clamped, the limitation of the device is large, the detection is low in efficiency when a large amount of labor force is consumed, the phenomenon of missed detection exists, and the problem that the detection of the resin lens takes time is caused.

2. Technical scheme

Resin lens surface defect detection device, including detecting casing and rotary mechanism, the internally mounted who detects the casing has the rack, the internally mounted of rack has detection device, rotary mechanism's one side surface close welding has the protection casing, rotary mechanism's inside is equipped with the column spinner, the bottom close welding of column spinner has the fixed block, and fixed block both sides close connection has translation mechanism, translation mechanism's inside slidable mounting has the clamp to get the mechanism.

Preferably, the clamping mechanism comprises a pin shaft A, a pin shaft B and a cylinder, a sliding block is tightly welded at the top of the clamping mechanism, the cylinder is tightly welded at the top of the clamping mechanism, a telescopic rod is arranged at the bottom of the cylinder and penetrates through the clamping mechanism to extend into the clamping mechanism, a fixing part C is tightly welded at the bottom of the telescopic rod, a fixing part A and a fixing part B are respectively tightly welded at the bottoms of two ends of the clamping mechanism, a transmission rod A and a transmission rod C are movably connected to holes in the surface of the fixing part A through the pin shaft A in sequence from outside to inside, a transmission rod B and a transmission rod D are movably connected to holes in the surface of the fixing part B through the pin shaft A in sequence from outside to inside, the front of mounting C has connecting rod B through round pin axle A swing joint, and the hole swing joint in the middle of connecting rod B bottom through round pin axle B and transfer line D, and there is connecting rod A at the back through round pin axle A swing joint, and the hole swing joint in the middle of connecting rod A bottom through round pin axle B and transfer line C, the bottom of transfer line A and transfer line C has connecting piece A through round pin axle A swing joint, and the tight welding in bottom of connecting piece A has the clamp to get ware A, the bottom of transfer line B and transfer line D has connecting piece B through round pin axle A swing joint, and the tight welding in bottom of connecting piece B has the clamp to get ware B.

Preferably, translation mechanism is including servo motor, one side surface of translation mechanism is equipped with the transmission mouth, translation mechanism's the inseparable welding in top has the fixed bolster, the inseparable welding in top of pressing from both sides the mechanism has the slider, one side surface spiro union of translation mechanism is fixed with servo motor, translation mechanism's internal rotation is connected with lead screw A, the inseparable welding in lead screw A surface has gear A, translation mechanism's internal rotation is connected with lead screw B, the inseparable welding in lead screw B surface has gear B, servo motor's one end is kept away from to lead screw A both ends and lead screw B all installs fixing bearing.

Preferably, translation mechanism is still including spacing slide bar, the one end that lead screw B is close to servo motor has the transmission jack closely to weld, the inside closely welding of translation mechanism has a set of spacing slide bar, and spacing slide bar is located lead screw A and lead screw B both sides, install gear C through the fixed bolster in the middle of gear A and the gear B, and gear C is connected with gear A and gear B meshing.

Preferably, rotary mechanism is including the fixed block, rotary mechanism's surperficial both sides all are equipped with slide A, the inseparable welding in fixed block both sides has translation mechanism, the top inseparable welding of fixed block has the column spinner, and the surface of column spinner is equipped with slide B, the top inseparable welding of column spinner has the limiting plate.

Preferably, rotary mechanism is still including the protection casing, the inseparable welding in one side surface of rotary mechanism has the protection casing, one side surface spiro union that rotary mechanism was kept away from to the protection casing is fixed with the motor, gear train A and gear train B are installed in the inside rotation of protection casing, the inside of protection casing is located rotatory installation between gear train A and the gear train B and is had gear D, and gear D and gear train A and gear train B mesh connection, gear train A and gear train B, slide A surface is located one side swing joint that gear D kept away from the protection casing and is had lifting rack, and lifting rack is connected with gear train A and gear train B mesh.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

1. the clamping mechanism of the invention stretches the telescopic rod through the air cylinder, the telescopic rod drives the fixing piece C at the bottom, the fixing piece C drives the connecting rod B and the connecting rod A which are movably connected with the fixing piece C to move up and down in a stretching way through the stretching and the contraction of the telescopic rod, when the telescopic rod ascends, the connecting rod B and the connecting rod A pull the transmission rod D and the transmission rod C to move towards the middle, the transmission rod B and the transmission rod A which are connected with the surfaces of the connecting piece B and the connecting piece A with the transmission rod D and the transmission rod C move towards the middle together with the transmission rod D and the transmission rod C, the stability of the clamping mechanism is increased, the device B is got to the clamp of connecting piece B and connecting piece A bottom and gets ware A and get the lens to the middle removal of getting, when the telescopic link descends, connecting rod B and connecting rod A pulling transfer line D and transfer line C move to both sides, transfer line B and transfer line A that connect at connecting piece B and connecting piece A surface with transfer line D and transfer line C move to both sides along with transfer line D and transfer line C together, the lens is put down to the both sides removal with getting ware A to the clamp of connecting piece B and connecting piece A bottom, the machine replaces the manpower, the phenomenon that reduces the hourglass and examines takes place, effectual solution needs the manual work to take the detection one by one, consume the labour, the problem that work efficiency is low.

2. The translation mechanism is inserted into the transmission jack through the output end of the servo motor, the screw rod B is driven to rotate through the transmission jack, the screw rod B drives the gear B with the surface being welded tightly to rotate, the gear B is meshed with the gear C movably installed through the fixed support to drive the movable gear A to rotate, the gear A drives the screw rod A to rotate, the clamping mechanism is driven by the slide block to translate, the purpose of adjusting the distance between the clamping mechanisms is achieved, the application range of the device is widened, and the problem that the device can only clamp resin lenses with specific sizes is effectively solved.

3. According to the invention, through the fixed rotating mechanism 4, the motor 404 drives the gear D406 to rotate, the gear D406 drives the gear set A405 and the gear set B407 which are in meshed connection to rotate, the gear set A405 and the gear set B407 are in discontinuous alternate meshing with the lifting rack 403 to drive the lifting rack 403 to reciprocate and move up and down, when the lifting rack 403 ascends, the bottom of the lifting rack 403 slides upwards through the slide track A401 on the slide track B409 on the surface of the rotating column 408, so that the rotating column 408 drives the translation mechanism 3 and the clamping mechanism 2 to rotate clockwise 180 degrees through the fixed block 410, resin lenses on a production line are clamped on the placing frame 5 for detection, when the lifting rack 403 descends, the bottom of the lifting rack 403 slides downwards through the slide track A401 on the slide track B409 on the surface of the rotating column 408, so that the rotating column 408 drives the translation mechanism 3 and the clamping mechanism 2 to rotate anticlockwise 180 degrees, the detected resin lenses are placed back to the production line, and simultaneously new resin lenses are clamped for detection, and the new detected lenses are taken out while being placed back, so that an energy-saving effect is achieved, and the problem of low working efficiency of resin lens detection is effectively solved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the overall structure of the gripping mechanism of the present invention;

FIG. 3 is a schematic view of a disassembled structure of the gripping mechanism of the present invention;

FIG. 4 is a schematic view of the overall structure of the translation mechanism of the present invention;

FIG. 5 is a schematic view of the translation mechanism of the present invention in a disassembled configuration;

FIG. 6 is a schematic view of the overall structure of the rotary mechanism of the present invention;

fig. 7 is a schematic view of a disassembled structure of the rotating mechanism of the present invention.

The reference numbers in the figures illustrate:

1. detecting the shell; 2. a gripping mechanism; 201. a slider; 202. a cylinder; 203. a telescopic rod; 204. a fixed part A; 205. a transmission rod A; 206. a connecting piece A; 207. a gripper A; 208. a gripper B; 209. a connecting piece B; 210. a connecting rod B; 211. a transmission rod C; 212. a transmission rod D; 213. a transmission rod B; 214. a fixing member B; 215. a pin shaft A; 216. a fixing member C; 217. a connecting rod A; 218. a pin B; 3. a translation mechanism; 301. a servo motor; 302. a limiting slide bar; 303. a fixed bracket; 304. a gear A; 305. a screw rod A; 306. a screw rod B; 307. fixing the bearing; 308. a gear B; 309. a transmission port; 310. a transmission jack; 311. a gear C; 4. a rotation mechanism; 401. a slideway A; 402. a protective housing; 403. a lifting rack; 404. a motor; 405. gear set A; 406. a gear D; 407. gear set B; 408. rotating the column; 409. a slideway B; 410. a fixed block; 411. a limiting plate; 5. placing a rack; 6. and (4) a detection device.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "fitted/connected", "connected", and the like, are to be interpreted broadly, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-3, the resin lens surface defect detecting device includes a detecting housing 1 and a rotating mechanism 4, a placing rack 5 is installed inside the detecting housing 1, a detecting device 6 is installed inside the placing rack 5, a protecting housing 402 is tightly welded on the surface of one side of the rotating mechanism 4, a rotating column 408 is arranged inside the rotating mechanism 4, a fixing block 410 is tightly welded at the bottom of the rotating column 408, two sides of the fixing block 410 are tightly connected with a translation mechanism 3, and a clamping mechanism 2 is slidably installed inside the translation mechanism 3.

The clamping mechanism 2 comprises a pin shaft A215, a pin shaft B218 and a cylinder 202, a sliding block 201 is tightly welded on the top of the clamping mechanism 2, the cylinder 202 is tightly welded on the top of the clamping mechanism 2, an expansion rod 203 is arranged at the bottom of the cylinder 202, the expansion rod 203 penetrates through the clamping mechanism 2 and extends into the clamping mechanism 2, a fixing part C216 is tightly welded at the bottom of the expansion rod 203, a fixing part A204 and a fixing part B214 are tightly welded at the bottoms of two ends of the clamping mechanism 2 respectively, a hole in the surface of the fixing part A204 is movably connected with a transmission rod A205 and a transmission rod C211 through the pin shaft A215 from outside to inside in sequence, a hole in the surface of the fixing part B214 is movably connected with a transmission rod B213 and a transmission rod D212 through the pin shaft A215 from outside to inside in sequence, a connecting rod B210 is movably connected on the front of the fixing part C216 through the pin shaft A215, the bottom end of the connecting rod B210 is movably connected with a hole in the middle of the transmission rod D212 through the pin shaft B218, a connecting rod A217 is movably connected with a connecting rod A217 through the pin shaft A215 at the bottom of the connecting rod A217, a connecting piece A and a connecting piece A207 are tightly connected with a connecting piece A209 through the clamping mechanism 207, and a connecting piece 209 are tightly welded on the bottom of the clamping mechanism 209 through a connecting piece B209, and a connecting piece 209.

According to the invention, the clamping mechanism 2 stretches the telescopic rod 203 through the air cylinder 202, the telescopic rod 203 drives the fixing piece C216 at the bottom, the fixing piece C216 drives the connecting rod B210 and the connecting rod A217 which are movably connected with the telescopic rod 203 to move up and down in a stretching way, when the telescopic rod 203 is lifted, the connecting rod B210 and the connecting rod A217 pull the transmission rod D212 and the transmission rod C211 to move towards the middle, the transmission rod B213 and the transmission rod A205 which are connected with the surfaces of the connecting piece B209 and the connecting piece A206 and connected with the transmission rod D212 and the transmission rod C211 move towards the middle along with the transmission rod D212 and the transmission rod C211, so that the stability of the clamping mechanism 2 is increased, the clamping device B208 and the clamping device A207 at the bottoms of the connecting piece B209 and the connecting piece A206 move towards the middle to clamp the lens, when the telescopic rod 203 is lowered, the connecting rod B210 and the connecting rod A217 pull the transmission rod D212 and the transmission rod C211 to move towards the two sides along with the transmission rod D209 and the transmission rod C211, the transmission rod B213 and the transmission rod A206 and the transmission rod A205 and the connecting piece B209 and the connecting piece A206 and the transmission rod A206 and the clamping device A207 move towards the two sides together along with the transmission rod D212 and the telescopic rod A, so that the labor force detection efficiency is reduced, and the detection of the detection is low.

Example 2:

referring to fig. 4-5, the basic difference of embodiment 1 is that the translation mechanism 3 includes a servo motor 301, a transmission port 309 is formed on a surface of one side of the translation mechanism 3, a fixing bracket 303 is tightly welded to a top of the translation mechanism 3, a slider 201 is tightly welded to a top of the clamping mechanism 2, the servo motor 301 is fixed to a surface of one side of the translation mechanism 3 through a threaded joint, a lead screw a305 is rotatably connected to an inside of the translation mechanism 3, a gear a304 is tightly welded to a surface of the lead screw a305, a lead screw B306 is rotatably connected to an inside of the translation mechanism 3, a gear B308 is tightly welded to a surface of the lead screw B306, and a fixing bearing 307 is installed at each of two ends of the lead screw a305 and one end of the lead screw B306, which is far away from the servo motor 301.

The translation mechanism 3 further comprises a limiting sliding rod 302, a transmission jack 310 is tightly welded at one end, close to the servo motor 301, of the screw rod B306, a group of limiting sliding rods 302 are tightly welded inside the translation mechanism 3, the limiting sliding rods 302 are located at two sides of the screw rod A305 and the screw rod B306, a gear C311 is installed between the gear A304 and the gear B308 through a fixing support 303, and the gear C311 is meshed and connected with the gear A304 and the gear B308.

According to the invention, the translation mechanism 3 is inserted into the transmission jack 310 through the output end of the servo motor 301, the transmission jack 310 drives the screw rod B306 to rotate, the screw rod B306 drives the gear B308 with the surface tightly welded to rotate, the gear B308 is meshed with the gear C311 movably arranged on the fixed support 303 to drive the movable gear A304 to rotate, the gear A304 drives the screw rod A305 to rotate, the clamping mechanism 2 is driven by the slide block 201 to translate, the purpose of adjusting the distance between the clamping mechanisms 2 is achieved, the application range of the device is expanded, and the problem that the device can only clamp resin lenses with specific sizes is effectively solved.

Example 3:

referring to fig. 6 to 7, the difference between the embodiment 1 and the embodiment is that the rotating mechanism 4 includes a fixed block 410, two sides of the surface of the rotating mechanism 4 are both provided with a slideway a401, two sides of the fixed block 410 are tightly welded with the translation mechanism 3, the top of the fixed block 410 is tightly welded with a rotating column 408, the surface of the rotating column 408 is provided with a slideway B409, and the top of the rotating column 408 is tightly welded with a limiting plate 411.

The rotating mechanism 4 further comprises a protective shell 402, the protective shell 402 is tightly welded on the surface of one side of the rotating mechanism 4, a motor 404 is fixed on the surface of one side, away from the rotating mechanism 4, of the protective shell 402 in a threaded manner, a gear set A405 and a gear set B407 are rotatably mounted in the protective shell 402, a gear D406 is rotatably mounted in the protective shell 402 between the gear set A405 and the gear set B407, the gear D406 is meshed with the gear set A405 and the gear set B407, the gear set A405 and the gear set B407 are connected, a lifting rack 403 is movably connected to one side, away from the protective shell 402, of the surface of the slideway A401, and the lifting rack 403 is meshed with the gear set A405 and the gear set B407.

According to the invention, through the fixed rotating mechanism 4, the motor 404 drives the gear D406 to rotate, the gear D406 drives the gear set A405 and the gear set B407 which are in meshed connection to rotate, the gear set A405 and the gear set B407 are in discontinuous alternate meshing with the lifting rack 403 to drive the lifting rack 403 to reciprocate and move up and down, when the lifting rack 403 ascends, the bottom of the lifting rack 403 slides upwards through the slide track A401 on the slide track B409 on the surface of the rotating column 408, so that the rotating column 408 drives the translation mechanism 3 and the clamping mechanism 2 to rotate clockwise 180 degrees through the fixed block 410, resin lenses on a production line are clamped on the placing frame 5 for detection, when the lifting rack 403 descends, the bottom of the lifting rack 403 slides downwards through the slide track A401 on the slide track B409 on the surface of the rotating column 408, so that the rotating column 408 drives the translation mechanism 3 and the clamping mechanism 2 to rotate anticlockwise 180 degrees, the detected resin lenses are placed back to the production line, and simultaneously new resin lenses are clamped for detection, and the new detected lenses are taken out while being placed back, so that an energy-saving effect is achieved, and the problem of low working efficiency of resin lens detection is effectively solved.

The foregoing shows and describes the general principles, principal features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. Resin lens surface defect detection device is including detecting casing (1) and rotary mechanism (4), its characterized in that: the detection device is characterized in that a placing frame (5) is arranged inside the detection shell (1), a detection device (6) is arranged inside the placing frame (5), a protection shell (402) is tightly welded on the surface of one side of the rotating mechanism (4), a rotating column (408) is arranged inside the rotating mechanism (4), a fixing block (410) is tightly welded at the bottom of the rotating column (408), translation mechanisms (3) are tightly connected to two sides of the fixing block (410), and clamping mechanisms (2) are slidably arranged inside the translation mechanisms (3);

the clamping mechanism comprises a translation mechanism (3) and is characterized in that the translation mechanism (3) comprises a servo motor (301), a transmission port (309) is formed in the surface of one side of the translation mechanism (3), a fixing support (303) is tightly welded to the top of the translation mechanism (3), a sliding block (201) is tightly welded to the top of the clamping mechanism (2), the servo motor (301) is fixed to the surface of one side of the translation mechanism (3) in a threaded mode, a screw rod A (305) is rotatably connected to the inside of the translation mechanism (3), a gear A (304) is tightly welded to the surface of the screw rod A (305), a screw rod B (306) is rotatably connected to the inside of the translation mechanism (3), a gear B (308) is tightly welded to the surface of the screw rod B (306), and fixed bearings (307) are installed at two ends of the screw rod A (305) and at the end, far away from the servo motor (301), of the screw rod B (306);

translation mechanism (3) are still including spacing slide bar (302), the one end that lead screw B (306) are close to servo motor (301) closely welds transmission jack (310), translation mechanism (3) inside closely welds a set of spacing slide bar (302), and just spacing slide bar (302) are located lead screw A (305) and lead screw B (306) both sides, install gear C (311) through fixed bolster (303) in the middle of gear A (304) and gear B (308), and gear C (311) are connected with gear A (304) and gear B (308) meshing.

2. The resin lens surface defect detecting apparatus according to claim 1, wherein: the clamping mechanism (2) comprises a pin shaft A (215), a pin shaft B (218) and an air cylinder (202), a sliding block (201) is tightly welded at the top of the clamping mechanism (2), the air cylinder (202) is tightly welded at the top of the clamping mechanism (2), an expansion rod (203) is arranged at the bottom of the air cylinder (202), the expansion rod (203) penetrates through the clamping mechanism (2) and extends into the clamping mechanism, a fixing part C (216) is tightly welded at the bottom of the expansion rod (203), fixing parts A (204) and B (214) are respectively tightly welded at the bottoms of two ends of the clamping mechanism (2), a hole in the surface of the fixing part A (204) is sequentially connected with a transmission rod A (205) and a transmission rod C (211) from outside to inside through the pin shaft A (215), a hole in the surface of the fixing part B (214) is sequentially and is movably connected with a transmission rod B (213) and a transmission rod D (212) from outside to inside through the pin shaft A (215), the surface of the fixing part C (216) is connected with a connecting rod B (210) through the hole A (215), the bottom end of the connecting rod B (210) is movably connected with a hole in the middle of the transmission rod D (212) through the pin shaft A, a movable connection rod A (217) through the pin shaft A, and the middle of the connecting rod A (217) is connected with the connecting rod B (217 through the movable connection rod A (211), and the movable rod (211) through the connecting rod (211A) through the movable connection rod (211), the bottom of the transmission rod A (205) and the bottom of the transmission rod C (211) are movably connected with a connecting piece A (206) through a pin shaft A (215), the bottom of the connecting piece A (206) is tightly welded with a clamping device A (207), the bottom of the transmission rod B (213) and the bottom of the transmission rod D (212) are movably connected with a connecting piece B (209) through a pin shaft A (215), and the bottom of the connecting piece B (209) is tightly welded with a clamping device B (208).

3. The apparatus for detecting surface defects of a resin lens according to claim 1, wherein: rotary mechanism (4) are including fixed block (410), rotary mechanism's (4) surperficial both sides all are equipped with slide A (401), the inseparable welding in fixed block (410) both sides has translation mechanism (3), the top inseparable welding of fixed block (410) has column spinner (408), and the surface of column spinner (408) is equipped with slide B (409), the top inseparable welding of column spinner (408) has limiting plate (411).

4. The apparatus for detecting surface defects of a resin lens according to claim 3, wherein: the rotary mechanism (4) further comprises a protective shell (402), the protective shell (402) is tightly welded on the surface of one side of the rotary mechanism (4), a motor (404) is fixed on the surface of one side, far away from the rotary mechanism (4), of the protective shell (402), a gear set A (405) and a gear set B (407) are installed in the protective shell in a rotating mode, a gear D (406) is installed in the protective shell (402) and located between the gear set A (405) and the gear set B (407) in a rotating mode, the gear D (406) is meshed with the gear set A (405) and the gear set B (407), a lifting rack (403) is movably connected to one side, far away from the protective shell (402), of the surface of the slide A (401), and the gear set A (405) and the gear set B (407) are meshed.