CN221056352U

CN221056352U - Middle frame appearance defect detection device

Info

Publication number: CN221056352U
Application number: CN202322416352.2U
Authority: CN
Inventors: 雷佳音
Original assignee: Guangdong Ailingxun Intelligent Technology Co ltd
Current assignee: Guangdong Ailingxun Intelligent Technology Co ltd
Priority date: 2023-09-06
Filing date: 2023-09-06
Publication date: 2024-05-31
Anticipated expiration: 2033-09-06

Abstract

The utility model provides a middle frame appearance defect detection device, which comprises a workbench, wherein three groups of work stations are arranged at the top end of the workbench, each group of work stations consists of a light source detection module and two feeding modules, the two feeding modules are arranged at the front end of the light source detection module in parallel, the three groups of work stations are uniformly distributed at the top of the workbench, each group of work stations can detect two middle frames of a mobile phone, a first screw rod is driven by a first servo motor to rotate so that a detection assembly moves left and right in a reciprocating manner, the two corresponding feeding modules move in a staggered manner, when the light source assembly moves to a corresponding position, the right corresponding feeding module sends a jig carrying the middle frame of the mobile phone to an industrial camera for detection, and a fourth servo motor is rotated so that the jig drives the middle frame of the mobile phone to rotate, thereby detecting four sides of the middle frame of the mobile phone, and the detection efficiency of the middle frame of the mobile phone can be improved.

Description

Middle frame appearance defect detection device

Technical Field

The utility model belongs to the technical field of middle frame detection, and particularly relates to a middle frame appearance defect detection device.

Background

The mobile phone middle frame has an important effect on protecting normal use of mobile phone equipment, the mobile phone middle frame is not smooth, asymmetric, distorted, scratched, bruise, fingerprint watermark and other problems possibly caused by the manufacturing process or product quality problems in the manufacturing process, the mobile phone middle frame is required to be detected after production, the mobile phone middle frame appearance detection device disclosed by application number 202220010402.X is found through retrieval, the mobile phone middle frame appearance detection device comprises a shell, a control component is arranged on the shell, a light sensor is arranged on the shell, a visual imaging system and an image pickup device are sequentially arranged on the same side of the light sensor from near to far, a first air pressure push rod and a second air pressure push rod are arranged on the shell, a storage basket is connected on the shell in a sliding mode, a weight sensor is arranged at a position of the shell, which is in contact with the storage basket, the detection device is matched with the image pickup device through the visual imaging system to photograph the appearance surface of the mobile phone middle frame, so that the efficiency of the mobile phone middle frame appearance detection device can be improved, the efficiency is improved, the efficiency of the mobile phone middle frame appearance detection device can be improved, the appearance detection device can be adjusted to the appearance detection device can be more accurately compared with the traditional mobile phone, the mobile phone appearance detection device can be adjusted by the human bottom surface, the human bottom surface is required to be detected by the human bottom surface, compared with the traditional mobile phone, the mobile phone appearance detection device can be more accurately, the human bottom can be detected by the human bottom, and the human bottom is required to be detected by the human eyes, and the human bottom, and the human quality detection device can be detected by the human quality, and the human quality is only has high in the human quality, and the human quality and the quality. Based on this, we propose a detection device that can effectively promote cell-phone center detection efficiency.

Disclosure of utility model

The utility model aims to provide a middle frame appearance defect detection device and aims to solve the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the middle frame appearance defect detection device comprises a workbench, wherein three groups of work stations are arranged at the top end of the workbench, each group of work stations consists of a light source detection module and two feeding modules, the two feeding modules are arranged at the front end of the light source detection module in parallel, and the three groups of work stations are uniformly distributed at the top of the workbench;

The light source detection module comprises a first installation seat and a detection frame, wherein the first installation seat is fixedly installed on the top end of the workbench, a first screw rod is rotatably installed in the middle of the first installation seat, one end of the first screw rod extends to the outside of the first installation seat and is fixedly connected with a first driven synchronous pulley, one side of the first installation seat is fixedly connected with a first servo motor, an output shaft of the first servo motor is fixedly connected with the first driving synchronous pulley, the first driving synchronous pulley is in transmission connection with the first driven synchronous pulley through a synchronous belt, a first guide rail is installed on the top end of the first installation seat, a diffuse reflection light source is installed on the front face of the detection frame, a first screw rod nut and a first slider are installed on the bottom end of the detection frame, the first screw rod nut is in threaded connection with the first guide rail, and a light focusing cover and a detection assembly are installed inside the detection frame.

As a first preferred technical scheme of the utility model, the feeding module comprises a second installation seat fixedly installed at the top end of a workbench, a second lead screw is rotatably installed at the middle part of the second installation seat, one end of the second lead screw extends to the outside of the second installation seat and is fixedly connected with a second driven synchronous pulley, one side of the second installation seat is fixedly connected with a second servo motor, an output shaft of the second servo motor is fixedly connected with a second driving synchronous pulley, the second driving synchronous pulley is in transmission connection with the second driven synchronous pulley through a synchronous belt, a first moving plate is arranged at the top of the second installation seat, a second guide rail is installed at the top end of the second installation seat, a second lead screw nut and a second slider are installed at the bottom end of the first moving plate, the second lead screw is in threaded connection with the second lead screw nut, the second slider is in sliding connection with the second guide rail, a third installation seat is fixedly connected with one side of the top of the first moving plate, a third lead screw is rotatably installed at the middle part of the third installation seat, the third installation seat is in transmission connection with the third driving synchronous pulley, the third driving synchronous pulley is fixedly connected with the third driven synchronous pulley, the third guide rail is fixedly connected with the top end of the third driven synchronous pulley, the third guide pulley is fixedly connected with the third driven synchronous pulley is fixedly installed at the top end of the third guide pulley, the top fixedly connected with motor support of second movable plate, motor support and fourth servo motor fixed connection, fourth servo motor's output shaft and tool bottom plate fixed connection.

As a preferable technical scheme of the utility model, the detection assembly comprises an arc-shaped hanging plate arranged in a detection frame, a plurality of industrial cameras are arranged on the surface of the arc-shaped hanging plate, the industrial cameras can respectively detect the upper surface, the side surface and the lower surface of the middle frame of the mobile phone, a hanging frame is arranged at one end of the arc-shaped hanging plate, and a diffusion strip lamp is arranged at the bottom end of the hanging frame.

As an optimal technical scheme of the utility model, a strip-shaped slot is formed in the back surface of the light condensing cover, the industrial camera is positioned in the light condensing cover through the strip-shaped slot, the middle part and the bottom in the light condensing cover are both provided with diffuse surface lamps, and the surface of the diffuse reflection light source is provided with a reflection prism.

As a preferable technical scheme of the utility model, the middle part of the diffuse reflection light source is provided with a circular opening communicated with the light condensing cover, the industrial camera positioned at one end of the top of the arc-shaped hanging plate is positioned outside the light condensing cover, and the shooting direction penetrates through the circular opening and faces into the light condensing cover.

As a preferable technical scheme of the utility model, the height of the jig bottom plate is higher than that of the reflecting prism.

As an optimized technical scheme of the utility model, the top end of the workbench is provided with the protective cover, and a strip-shaped groove is formed in one side of the protective cover, which is positioned on the bottom plate of the jig.

Compared with the prior art, the utility model has the beneficial effects that: each group of work stations can detect two mobile phone middle frames, drive first lead screw through first servo motor and rotate and make the detection subassembly control reciprocating motion, and two pay-off modules that correspond are crisscross to be removed, when making the light source subassembly remove to corresponding position, just the pay-off module that corresponds will bear the tool of mobile phone middle frame and send industry camera department to detect, and make the tool drive mobile phone middle frame rotate through fourth servo motor rotation, thereby can detect top, bottom and the periphery (median plane + upper and lower transition selvedge + interior side) of mobile phone middle frame, thereby can promote the detection efficiency of mobile phone middle frame, every group of work stations carries out pay-off detection through the crisscross parallel mode of two pay-off modules to the middle frame, further promote the detection efficiency of mobile phone middle frame.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of the structure of the present utility model;

FIG. 3 is a schematic diagram of a workstation according to the present utility model;

FIG. 4 is a schematic diagram of a split structure of a light source detection module according to the present utility model;

FIG. 5 is a schematic diagram of a detecting assembly according to the present utility model;

FIG. 6 is a schematic view of a light-focusing cover in the present utility model;

fig. 7 is a schematic structural diagram of a feeding module in the present utility model.

In the figure: 1. a work table; 2. a light source detection module; 21. a first mount; 22. a detection frame; 23. a first screw rod; 24. a first driven synchronous pulley; 25. a first servo motor; 26. a first driving synchronous pulley; 27. a first guide rail; 28. a diffuse reflection light source; 29. a first lead screw nut; 210. a first slider; 211. a light-gathering cover; 212. a detection assembly; 2121. an arc hanging plate; 2122. an industrial camera; 2123. a hanging rack; 2124. a diffusion strip lamp; 213. a strip-shaped groove; 214. a diffuse surface light; 215. a reflecting prism; 216. a circular opening; 3. a feeding module; 31. a second mounting base; 32. a second screw rod; 33. a second driven synchronous pulley; 34. a second servo motor; 35. a second driving synchronous pulley; 36. a first moving plate; 37. a second guide rail; 38. a second lead screw nut; 39. a second slider; 310. a third mount; 311. a third screw rod; 312. a third guide rail; 313. a third driven synchronous pulley; 314. a third servo motor; 315. a third driving synchronous pulley; 316. a second moving plate; 317. a third lead screw nut; 318. a motor bracket; 319. a fourth servo motor; 320. a jig bottom plate; 4. a protective cover; 5. a bar-shaped groove.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-7, the present utility model provides the following technical solutions: the utility model provides a middle frame appearance defect detection device, includes workstation 1, and three groups of work stations are installed on workstation 1's top, and every group work station comprises a light source detection module 2 and two pay-off modules 3, and two pay-off modules 3 set up in light source detection module 2's front end side by side, and three groups work stations are at workstation 1 top evenly distributed.

In this embodiment, the light source detection module 2 includes a first mount 21 and a detection frame 22, the first mount 21 is fixedly mounted on the top end of the workbench 1, a first screw rod 23 is rotatably mounted in the middle of the first mount 21, one end of the first screw rod 23 extends to the outside of the first mount 21 and is fixedly connected with a first driven synchronous pulley 24, one side of the first mount 21 is fixedly connected with a first servo motor 25, an output shaft of the first servo motor 25 is fixedly connected with a first driving synchronous pulley 26, the first driving synchronous pulley 26 is connected with the first driven synchronous pulley 24 through a synchronous belt, a first guide rail 27 is mounted on the top end of the first mount 21, a diffuse reflection light source 28 is mounted on the front surface of the detection frame 22, a first screw rod nut 29 and a first slider 210 are mounted on the bottom end of the detection frame 22, the first screw rod nut 29 is in threaded connection with the first screw rod 23, the first slider 210 is in sliding connection with the first guide rail 27, and a light condensation cover 211 and a detection assembly 212 are mounted inside the detection frame 22.

Specifically, the first driving synchronous pulley 26 is driven to rotate by the first servo motor 25, the first driven synchronous pulley 24 drives the first screw rod 23 to rotate under the action of the synchronous belt, the detection frame 22 drives the first sliding block 210 to transversely move along the direction of the first guide rail 27 under the action of the first screw rod nut 29, the detection assembly 212 can reciprocate left and right at the top of the first mounting seat 21 by controlling the first servo motor 25 to positively and negatively rotate, and the appearance of the middle frame of the mobile phone, which is sent to the feeding module 3, can be detected by the detection assembly 212.

In this embodiment, the feeding module 3 includes a second mounting seat 31 fixedly mounted on the top end of the workbench 1, a second screw rod 32 is rotatably mounted in the middle of the second mounting seat 31, one end of the second screw rod 32 extends to the outside of the second mounting seat 31 and is fixedly connected with a second driven synchronous pulley 33, one side of the second mounting seat 31 is fixedly connected with a second servo motor 34, an output shaft of the second servo motor 34 is fixedly connected with a second driving synchronous pulley 35, the second driving synchronous pulley 35 is in transmission connection with the second driven synchronous pulley 33 through a synchronous belt, a first moving plate 36 is arranged at the top of the second mounting seat 31, a second guide rail 37 is mounted at the top end of the second mounting seat 31, a second screw rod nut 38 and a second slide block 39 are mounted at the bottom end of the first moving plate 36, the second screw rod 32 is in threaded connection with the second screw rod nut 38, the second slide block 39 is in sliding connection with the second guide rail 37, a third installation seat 310 is installed at the top end of the first moving plate 36, a third screw rod 311 is rotatably installed in the middle of the third installation seat 310, a third guide rail 312 is installed at the top end of the third installation seat 310, one end of the third screw rod 311 extends to the outside of the third installation seat 310 and is fixedly connected with a third driven synchronous pulley 313, one side of the third installation seat 310 is fixedly connected with a third servo motor 314, an output shaft of the third servo motor 314 is fixedly connected with a third driving synchronous pulley 315, the third driving synchronous pulley 315 is in transmission connection with the third driven synchronous pulley 313 through a synchronous belt, a second moving plate 316 is arranged at the top of the third installation seat 310, a third screw rod nut 317 and a third sliding block are installed at the bottom of the second moving plate 316, the third screw rod nut 317 is in threaded connection with the third screw rod 311, the third sliding block is in sliding connection with the third guide rail 312, the top fixedly connected with motor support 318 of second movable plate 316, motor support 318 and fourth servo motor 319 fixed connection, the output shaft and the tool bottom plate 320 fixed connection of fourth servo motor 319.

Specifically, the second driving synchronous pulley 35 is driven to rotate by the second servo motor 34, the second driven synchronous pulley 33 drives the second screw rod 32 to rotate under the action of the synchronous belt, then the first moving plate 36 can move towards or away from the detection component 212 on the surface of the second guide rail 37, the third driving synchronous pulley 315 is driven to rotate by the third servo motor 314, the third driven synchronous pulley 313 can drive the third screw rod 311 to rotate under the action of the synchronous belt, then the second moving plate 316 drives the third sliding block to transversely move along the direction of the third guide rail 312, the direction of the jig bottom plate 320 is adjusted, the jig bottom plate 320 is driven to rotate by the fourth servo motor 319, the side wall direction of the middle frame placed on the surface of the jig bottom plate 320 can be adjusted, and then the feeding module 3 can convey the jig bottom plate 320 bearing the middle frame of the mobile phone into the light source detection module 2 in the light condensation cover 211, the upper surface, the lower surface and the periphery (middle plane + upper and lower transition small side + inner side edge of the mobile phone) of the middle plane + upper and lower transition small side of the middle plane + lower transition small side of the industrial camera 2122 can be simultaneously detected by the industrial camera 2122, and the effective detection efficiency of the middle frame can be improved.

In this embodiment, the detection assembly 212 includes an arc-shaped hanging plate 2121 installed in the detection frame 22, a plurality of industrial cameras 2122 are installed on the surface of the arc-shaped hanging plate 2121, a hanging frame 2123 is installed at one end of the arc-shaped hanging plate 2121, and a diffusion strip lamp 2124 is installed at the bottom end of the hanging frame 2123.

Specifically, the upper surface, the side surface and the lower surface of the middle frame of the mobile phone can be detected simultaneously through the set industrial camera 2122, and the brightness of the upper surface of the middle frame of the mobile phone can be improved through the set diffusion strip lamp 2124, so that the accuracy of appearance detection is improved.

In this embodiment, a strip-shaped slot 213 is formed in the back surface of the light-gathering cover 211, the industrial camera 2122 is located inside the light-gathering cover 211 through the strip-shaped slot 213, a diffuse surface lamp 214 is installed in the middle and bottom of the light-gathering cover 211, and a reflecting prism 215 is installed on the surface of the diffuse reflection light source 28.

Specifically, the diffusion surface lamps 214 arranged in the middle and the bottom can play a role in improving brightness on the side surface and the lower surface of the middle frame of the mobile phone, so that the accuracy of detection of the middle frame of the mobile phone can be improved, and the light source can be further reflected through the arranged reflecting prism 215, so that the utilization rate of the light source is improved.

In this embodiment, a circular opening 216 is formed in the middle of the diffuse reflection light source 28 and is communicated with the light-gathering cover 211, and an industrial camera 2122 located at one end of the top of the arc-shaped hanging plate 2121 is located outside the light-gathering cover 211, and the shooting direction passes through the circular opening 216 and faces into the light-gathering cover 211.

Specifically, after the jig bottom plate 320 is sent into the light condensing cover 211 through the circular opening 216, the middle frame on the surface of the jig bottom plate 320 can be detected in all directions through the industrial camera 2122, so that the detection efficiency of the middle frame of the mobile phone is effectively improved.

In the present embodiment, the height of the jig base plate 320 is higher than the height of the reflection prism 215.

Specifically, in this manner, the reflective prism 215 is prevented from blocking the jig base plate 320 when the jig base plate 320 moves toward the inside of the light-condensing cover 211.

In this embodiment, the top end of the workbench 1 is provided with a protective cover 4, and a strip-shaped groove 5 is formed on one side of the protective cover 4, which is located on the jig bottom plate 320.

Specifically, the staff can place the cell-phone center to tool bottom plate 320 surface through bar groove 5, can promote the factor of safety of staff's work through the protection casing 4 that sets up.

Working principle: a worker can place the middle frame of the mobile phone on the surface of the bottom plate 320 of the jig through the bar-shaped groove 5 by hand or a mechanical arm, can move the bottom plate 320 of the jig towards the light source detection module 2 through the second servo motor 34 matched with the second screw rod 32, can adjust the position of the bottom plate 320 of the jig through the third servo motor 314 matched with the third screw rod 311, so that the bottom plate 320 of the jig just enters the light-gathering cover 211 through the circular opening 216, and can drive the bottom plate 320 of the jig to rotate through the fourth servo motor 319, so that the industrial camera 2122 can photograph and detect the top, the bottom and the periphery (the middle plane + the upper and lower transition small sides + the inner sides) of the middle plane, and can photograph the industrial camera 2122 through the arranged diffuse reflection light source 28 matched with the light-gathering cover 211 to provide a light source, and can improve the illumination intensity of the surface of the middle frame of the mobile phone through the arranged diffuse surface lamp 214 and the diffuse strip lamp 2124, the light source utilization rate of the work station can be improved through the light condensing cover 211 and the reflecting prism 215, when the middle frame of the mobile phone is detected in the mode, the detection efficiency of the middle frame can be greatly improved, two feeding modules 3 in each work station are operated in a staggered mode, namely, when one feeding module 3 moves towards the light source detection module 2, the other feeding module 3 is positioned at the strip-shaped groove 5, after the detection of the corresponding middle frame is finished, the light source detection module 2 moves to the direction of the other feeding module 3 through the first servo motor 25 and the first screw rod 23, in the process, the detected feeding module 3 returns to the strip-shaped groove 5 and the other feeding module 3 repeats the operation to move the work station to the light source detection module 2, the detection device is provided with three work stations, the two feeding modules 3 in each work station work in a staggered and parallel mode, the detection efficiency of the mobile phone middle frame is effectively improved.

It should be noted that, in the detection device, the electric equipment is electrically connected with the external PLC controller, and the image data photographed by the industrial camera 2122 is transmitted to the external image analysis terminal for analysis, and this mode is in the prior art and will not be described herein too much.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides a middle frame outward appearance defect detection device, includes workstation (1), its characterized in that: three groups of work stations are arranged at the top end of the workbench (1), each group of work stations consists of a light source detection module (2) and two feeding modules (3), the two feeding modules (3) are arranged at the front end of the light source detection module (2) in parallel, and the three groups of work stations are uniformly distributed at the top of the workbench (1);

The light source detection module (2) comprises a first mounting seat (21) and a detection frame (22), the first mounting seat (21) is fixedly mounted on the top end of the workbench (1), a first lead screw (23) is rotatably mounted on the middle of the first mounting seat (21), one end of the first lead screw (23) extends to the outside of the first mounting seat (21) and is fixedly connected with a first driven synchronous pulley (24), one side of the first mounting seat (21) is fixedly connected with a first servo motor (25), an output shaft of the first servo motor (25) is fixedly connected with a first driving synchronous pulley (26), the first driving synchronous pulley (26) is connected with a first driven synchronous pulley (24) through synchronous belt transmission, a first guide rail (27) is mounted on the top end of the first mounting seat (21), a diffuse reflection light source (28) is mounted on the front of the detection frame (22), a first lead screw nut (29) and a first slider (210) are mounted on the bottom end of the detection frame (22), and the first lead screw nut (29) is connected with the first guide rail (210) through synchronous belt transmission.

2. The device for detecting appearance defects of a middle frame according to claim 1, wherein: the feeding module (3) comprises a second mounting seat (31) fixedly mounted at the top end of the workbench (1), a second screw rod (32) is rotatably mounted in the middle of the second mounting seat (31), one end of the second screw rod (32) extends to the outside of the second mounting seat (31) and is fixedly connected with a second driven synchronous pulley (33), one side of the second mounting seat (31) is fixedly connected with a second servo motor (34), an output shaft of the second servo motor (34) is fixedly connected with a second driving synchronous pulley (35), the second driving synchronous pulley (35) is in transmission connection with the second driven synchronous pulley (33) through a synchronous belt, a first moving plate (36) is arranged at the top of the second mounting seat (31), a second guide rail (37) is arranged at the top end of the second mounting seat (31), a second screw nut (38) and a second sliding block (39) are arranged at the bottom end of the first moving plate (36), the second screw rod (32) is fixedly connected with the second sliding block nut (38), a third guide rail (310) is arranged at the top end of the second mounting seat (310), one end of the third screw rod (311) extends to the outside of the third mounting seat (310) and is fixedly connected with the third driven synchronous pulley (313), one side of the third mounting seat (310) is fixedly connected with a third servo motor (314), an output shaft of the third servo motor (314) is fixedly connected with a third driving synchronous pulley (315), the third driving synchronous pulley (315) is fixedly connected with the third driven synchronous pulley (313) through a synchronous belt, a second movable plate (316) is arranged at the top of the third mounting seat (310), a third screw rod nut (317) and a third sliding block are arranged at the bottom of the second movable plate (316), the third screw rod nut (317) is in threaded connection with the third screw rod (311), the third sliding block is in sliding connection with a third guide rail (312), a motor bracket (318) is fixedly connected with the top of the second movable plate (316), and the motor bracket (318) is fixedly connected with a fourth servo motor (319), and the output shaft of the fourth servo motor (319) is fixedly connected with a bottom plate (320).

3. The device for detecting appearance defects of a middle frame according to claim 2, wherein: the detection assembly (212) comprises an arc-shaped hanging plate (2121) arranged in a detection frame (22), a plurality of industrial cameras (2122) are arranged on the surface of the arc-shaped hanging plate (2121), a hanging frame (2123) is arranged at one end of the arc-shaped hanging plate (2121), and a diffusion strip lamp (2124) is arranged at the bottom end of the hanging frame (2123).

4. A center appearance defect detection apparatus according to claim 3, wherein: the back of snoot (211) has seted up bar fluting (213), industry camera (2122) are located the inside of snoot (211) through bar fluting (213), diffusion surface lamp (214) are all installed to middle part and bottom in snoot (211), diffuse reflection light source (28) surface mounting has reflecting prism (215).

5. A center appearance defect detection apparatus according to claim 3, wherein: the middle part of diffuse reflection light source (28) is offered circular trompil (216) that communicate snoot (211), and industrial camera (2122) that are located arc link plate (2121) top one end are located snoot (211) outside and take a photograph in the direction and see through circular trompil (216) towards snoot (211).

6. The device for detecting appearance defects of a middle frame according to claim 4, wherein: the height of the jig bottom plate (320) is higher than that of the reflecting prism (215).

7. The device for detecting appearance defects of a middle frame according to claim 2, wherein: the top of the workbench (1) is provided with a protective cover (4), and a strip-shaped groove (5) is formed in one side of the protective cover (4) located on the jig bottom plate (320).