A mobile phone shell surface crack detection system

Abstract

The present invention relates to the field of mobile phone detection technology, and specifically to a mobile phone shell surface crack detection system. The technical solution includes: a workbench; a conveyor belt, which is rotatably arranged on the workbench, and a shell positioning component, which is used to correct the position of a mobile phone shell on a mobile phone shell placement seat to complete the positioning. A long-side micro-camera unit is installed on the workbench. A rotating component is used to rotate the mobile phone shell placement seat. A short-side micro-camera unit is installed on the workbench. A reset component is connected to the mobile phone shell placement seat. A controller is electrically connected to the conveyor belt, the long-side micro-camera unit and the short-side micro-camera unit. The controller is used to control the conveyor belt for transmission. By displaying the crack coordinates, the position and quantity can be determined. The display is clear and concise, which is convenient for taking measures for the corresponding positions of the processing production line.

Description

Technical Field

[0001] The invention relates to the technical field of mobile phone detection, and in particular to a mobile phone shell surface crack detection system. Background Art

[0002] The mobile phone case is a protective cover for the mobile phone, which is used to protect the mobile phone from damage. With the development of technology, the design and materials of mobile phone cases are also constantly improving to meet the growing needs of consumers. Common mobile phone case materials are: Plastic: It is one of the most common shell materials. It is cheap and resistant to falling, but it has a hard texture and poor feel. Metal: Such as aluminum alloy, stainless steel, etc., with good texture and comfortable feel, but relatively expensive. Glass: It has good scratch resistance and fall resistance, but it is easy to be stained with fingerprints, so special attention should be paid to cleaning. In addition, there are some innovative materials, such as liquid metal, carbon fiber, etc., each with its own advantages and disadvantages.

[0003] Mobile phone shell crack detection is a method of detecting whether there are cracks in the mobile phone shell by visual observation or with the help of some auxiliary tools. With the rapid development of the mobile phone industry, people's requirements for mobile phones are getting higher and higher, and the quality of mobile phone shells is also receiving more and more attention. Crack detection can effectively avoid accidental damage caused by shell cracks and increase the service life of mobile phones. The following are the general steps for mobile phone shell crack detection: Visual inspection: Place the mobile phone on a flat table and carefully observe the shell surface with the naked eye, especially the fragile parts such as the edge of the screen, the key area and the corners. If obvious cracks are found, a new shell should be replaced in time. Use optical instruments: Professional equipment such as magnifying glasses and crack detectors can be used to check the fine cracks in the shell. These devices can help technicians more accurately determine whether there are cracks in the shell, as well as the location and extent of the cracks. Professional software detection: Some mobile phone manufacturers and professional institutions will develop special mobile phone shell detection software. Users can download and install these software to let the software automatically scan and identify shell cracks. Although this method is convenient, its accuracy may not be as good as manual and professional equipment detection. In general, mobile phone shell crack detection is an important task, which can not only guarantee the rights and interests of consumers, but also reduce the number of scrapped mobile phone shells and reduce resource waste. At the same time, the crack detection method is also constantly innovating and improving, providing consumers with more comprehensive and reliable protection.

[0004] During the processing and production of mobile phone shells, scratches are most likely to occur on the edges. It is also difficult to detect the edges of the mobile phone shells during inspection, and small areas need to be magnified for viewing, resulting in poor reliability in use. It is also not conducive to countermeasures for defects in the processing production line. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a mobile phone shell surface crack detection system, which is used to perform appearance detection on the edge of the mobile phone shell, and perform analysis and quantitative evaluation. The mobile phone shell surface crack detection system comprises:

[0006] The workbench can be two supporting beam structures fixedly arranged in parallel with each other. The two supporting beam structures are fixedly connected by multiple connecting rods to form a stable supporting foundation. The specific structure is the prior art and will not be described in detail here. The workbench can be installed at the sampling inspection station. At this time, the mobile phone shell needs to be placed in the designated position manually or by a manipulator. The workbench can also be installed on the processing and production line of the mobile phone shell. The processed mobile phone shell can be directly placed on the workbench for testing, so that a full inspection can be performed. The four corners of the workbench can be fixedly connected with support legs, and the bottom of the support legs can be fixedly provided with a fixing plate with mounting holes. Bolts can pass through the mounting holes to fix the workbench on the production line or on the ground of the sampling inspection station.

[0007] The conveyor belt is rotatably arranged on the workbench and is used to convey the mobile phone shell. At this time, we can set the conveying direction of the mobile phone shell to the longitudinal direction, that is, the conveying direction of the conveyor belt. The horizontal direction is defined as the horizontal direction perpendicular to the longitudinal direction. The conveyor belt can also be a conveyor chain structure, which will not be described in detail here. The conveyor belt is located between two supporting beam structures. One end of the conveyor belt is a feeding station, and the other end is a discharging station. The conveying direction of the conveyor belt is from the feeding station to the discharging station. The feeding station is at the feeding end, and the discharging station is at the other end. A mobile phone shell placement seat is rotatably arranged on the conveyor belt. The mobile phone shell placement seat is used to place the mobile phone shell. The number of mobile phone shell placement seats can be one or more, which can be set according to actual needs. When the mobile phone shell placement seat is at the feeding station of the conveyor belt, the mobile phone shell can be placed on the upper surface of the mobile phone shell placement seat by manual or handling robots. The mobile phone shell placement seat can be a circular, square or rectangular structure, among which a circular structure is preferred. The unloading station can unload the mobile phone shell by gravity. Of course, the unloading station can also directly transfer the workpiece to the next process for processing. The details will not be elaborated here.

[0008] The shell positioning component is used to correct the position of the mobile phone shell on the mobile phone shell placement seat to complete the positioning. When we place the mobile phone shell manually or by a robot, the approximate position of the mobile phone shell on the mobile phone shell placement seat is certain, but there will be a certain error. This error will have a certain impact on the detection and is the key to affecting the accuracy of the detection or the ability to detect.

[0009] The long side micro camera unit is installed on the workbench and is used to take a photo of the long side of the mobile phone shell to obtain a microscopic photo of the long side. Two long side micro camera units can be arranged opposite to each other and fixedly arranged on both sides of the conveyor belt. The long side micro camera unit can take a microscopic photo of the long side of the mobile phone shell. The height of the long side micro camera unit needs to be the same as the height of the mobile phone shell, so as to facilitate targeted shooting.

[0010] The rotating assembly is installed on the workbench and connected to the mobile phone shell placement seat, and is used to rotate the mobile phone shell placement seat by 90 degrees, so as to rotate the edge of the mobile phone shell on the mobile phone shell placement seat by 90 degrees. Make the long side of the mobile phone shell perpendicular to the longitudinal direction, which is convenient for detecting the short side of the mobile phone shell.

[0011] The short-side micro-camera unit is installed on the workbench and is used to photograph the short side of the mobile phone shell to obtain short-side microscopic photos. Two short-side micro-camera units can be arranged opposite to each other and fixedly arranged on both longitudinal sides of the conveyor belt respectively. The short-side micro-camera units can take microscopic photos of the short side of the mobile phone shell.

[0012] The reset component is connected to the mobile phone shell placement seat and is used to rotate the mobile phone shell placement seat in the opposite direction by 90 degrees. The reset component can be a rack structure and is fixedly installed on the workbench. The details are not repeated here.

[0013] The controller is electrically connected to the conveyor belt, the long-side micro-camera unit and the short-side micro-camera unit. The controller is used to control the conveyor belt for transmission. The controller is used to control the long-side micro-camera unit and the short-side micro-camera unit to shoot the long and short sides of the mobile phone shell to obtain microscopic photos. The microscopic photos include long-side microscopic photos and short-side microscopic photos. The controller is used to construct a spatial coordinate system. The controller processes the microscopic photos to obtain crack images, and inserts the crack images into the spatial coordinate system accordingly. The method for processing the microscopic photos may include black and white-high contrast-finding edges, etc., which can clearly display the cracks in the microscopic photos. The controller calculates the crack images to obtain the crack width, and can start sorting from one end. The details are not repeated here. Filter the cracks and display the crack width greater than one W 标 The cracks are numbered and the crack width W is obtained. i , where i is the crack sequence number, and the controller calculates the length L of each crack i , where the crack width W i and crack length L i The calculation method of is prior art and will not be described in detail here. The controller outputs the crack coordinates (x i ,y i , z i , W i , L i). The crack evaluation parameters are calculated and the edge of the mobile phone shell is evaluated by the crack evaluation parameters.

[0014] Preferably: a nested ring can be fixedly connected to the corresponding position of the conveyor belt, and the central support shaft and the nested ring are nested and matched, so that the mobile phone shell placement seat can be rotated to complete the reversal under the drive of external force, and after the external force disappears, there is friction between the central support shaft and the nested ring, thereby preventing the mobile phone shell placement seat from rotating and preventing the mobile phone shell from moving and causing inaccurate positioning.

[0015] Preferably: the shell positioning assembly may also include a central support seat, a positioning side clamp wing, a side clamp protrusion and a support member, the side clamp protrusion is fixed on the workbench and is between the conveyor belts, the side clamp protrusion may be a rod-shaped structure arranged horizontally and an arched structure with a circular arc protrusion on its upper surface fixedly connected and combined, the mobile phone shell placement seat includes a central support seat and a positioning side clamp wing, the positioning side clamp wing is provided with four and symmetrically rotated and connected to the four sides of the central support seat, and the central support seat and the positioning side clamp wing constitute a placement plane. The central support seat is fixedly connected to the central support shaft, and the rotation connection point between the positioning side clamp wing and the central support seat is on the upper surface of the central support seat, so that the central support seat and the positioning side clamp wing constitute a placement plane, or the height of the central support seat is higher than the horizontal height when the positioning side clamp wing is flat, so that the edge of the mobile phone shell can be fully displayed for easy detection. The bottom of the positioning side clamp wing is connected with a support member, and the support member can be fixedly connected or rotationally connected to the positioning side clamp wing, wherein fixed connection is preferred. The side clamp protrudes and is arranged on two turning positions, and the support member and the side clamp protrudes and slides and contacts, and when the support member and the side clamp protruding rod-shaped structure contact, the central support seat and the upper surface of the positioning side clamp wing are on a horizontal plane. The support member contacts the arched structure protruding from the side clamp, and the positioning side clamp wing rotates and tilts upward, and the mobile phone shell placed on the central support seat can be clamped and positioned. Of course, the side clamp protruding arched structure can also be directly lifted upward by the side clamp, so that the position of the mobile phone shell on the central support seat is corrected, and when the mobile phone shell placement seat rotates and changes direction, the other opposite side of the mobile phone shell is clamped and positioned. When the positioning side clamp wing tilts upward, the mobile phone shell can be tilted and rotated and corrected, and the mobile phone shell can be pushed to the position between the positioning side clamp wings. Of course, the width of the central support seat can also be less than the width of the mobile phone shell, but it is good to have no mobile phone shell width equal to the width of the central support seat.

[0016] Preferably: the support member may include a support rod and a rotating ball, the support rod is fixedly or rotatably connected under the positioning side clamp wing, and the rotating ball is rotatably connected to the bottom of the support rod. The rotating ball can reduce the friction between the side clamp protrusions and facilitate the docking of the support rod and the side clamp protrusion.

[0017] Preferably: the upper surface of the central support seat can be fixedly provided with an anti-skid support layer, which can increase the friction of the mobile phone shell. At this time, the width of the central support seat is smaller than the width of the mobile phone shell. The positioning side clamping wings are tilted upward, which can separate the mobile phone shell from the anti-skid support layer, making it easier to adjust the position of the mobile phone shell. When the positioning side clamping wings are rotated downward, the mobile phone shell falls on the anti-skid support layer, which can limit the position change of the mobile phone shell to the maximum extent. When we place the mobile phone shell, the long side of the mobile phone is generally placed parallel to the conveyor belt, so as to facilitate placement and positioning.

[0018] Preferably: the rotating assembly may include a side-changing drive and a steering drive, the side-changing drive is coaxially fixedly connected to the central support shaft, the inner side of the workbench is fixedly provided with a steering drive, the side-changing drive may be a gear structure, the steering drive may be a gear rod, when the mobile phone shell placement seat moves to a relative position, the steering drive engages with the side-changing drive, the steering drive drives the side-changing drive to rotate, thereby rotating the central support seat, the length of the steering drive is 1 / 4 of the outer diameter of the side-changing drive, thereby enabling the mobile phone shell placement seat to rotate.

[0019] Preferably: the crack evaluation parameter may include the crack appearance value w i And crack impact value K.

[0020] Preferred: Crack visibility

[0021] Preferred: Crack Impact Value Where i is the crack sequence number, I is the total number of cracks, i = ,┈,I;ɑ i It is the position tolerance coefficient, which can be obtained by looking up the information table according to the location of the crack. The information table can be made in advance based on experience, and the details are not repeated here. By displaying the crack coordinates, the position and quantity can be displayed clearly, which is convenient for taking countermeasures for the processing procedures at the corresponding positions of the processing production line. By evaluating the crack influence value K and quantifying the evaluation value, the appearance can be evaluated more objectively and accurately, and the evaluation ability is strong.

[0022] Preferably, lighting lamps are arranged at corresponding positions of the long-side micro-camera unit and the short-side micro-camera unit, and the lighting lamps can illuminate the mobile phone housing when photographing, thereby facilitating subsequent processing.

[0023] Preferably, a shielding shell is fixedly arranged on the workbench, and the setting of the shielding shell prevents interference of external light on detection, thereby increasing the accuracy of detection.

[0024] Preferably: the rotating assembly may include a missing edge gear and a sliding drive rod, the missing edge gear is coaxially fixedly connected to the central support shaft, the missing edge gear is an incomplete gear, including a tooth pattern portion and a tooth pattern portion, the tooth pattern portion and the tooth pattern portion have the same arc and are arranged in four sections, and are evenly spaced on the missing edge gear. The sliding drive rod is fixedly connected to the workbench, and the sliding drive rod includes a sliding rod portion and a tooth rod portion, the sliding rod portion and the tooth rod portion are fixedly connected and are in the longitudinal direction, and the length of the tooth rod portion is the same as the length of the tooth pattern portion. When the mobile phone shell placement seat does not need to rotate, the notch portion and the sliding rod portion contact and slide, thereby limiting the angle of the mobile phone shell placement seat, and when the mobile phone shell placement seat moves the tooth rod portion, the tooth pattern portion meshes with the tooth rod portion, and the tooth rod portion pushes the tooth pattern portion to rotate, thereby rotating the mobile phone shell placement seat. The mobile phone shell placement seat is accurately positioned and the rotation angle is accurate, which is convenient for detection.

[0025] The technical effects and advantages of the present invention are as follows: by displaying the crack coordinates, the position and quantity can be displayed clearly, which is convenient for taking countermeasures for the processing procedures at the corresponding positions of the processing production line. By quantifying the evaluation value through the crack evaluation parameters, the appearance can be evaluated more objectively and accurately, and the evaluation ability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a mobile phone shell surface crack detection system.

[0027] Figure 2 The present invention is a schematic diagram of a top view of a mobile phone housing surface crack detection system.

[0028] Figure 3 for Figure 2 Schematic diagram of the partial cross-sectional structure of section AA.

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of a mobile phone shell surface crack detection system in Example 1 of the present invention.

[0030] Figure 5 This is a schematic diagram of the three-dimensional structure of the rotating assembly in Example 2 of a mobile phone shell surface crack detection system proposed by the present invention.

[0031] Explanation of the reference numerals: workbench 1, conveyor belt 2, shielding shell 3, mobile phone shell placement seat 4, long side micro camera unit 5, short side micro camera unit 6, steering drive 7, mobile phone shell 8, central support seat 9, anti-slip support layer 10, positioning side clamping wing 12, center support shaft 14, side change drive 13, side clamping protrusion 15, support member 16, notch portion 17, toothed portion 18, slide rod portion 19, gear rod portion 20. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0033] Example 1

[0034] refer to Figure 1-Figure 4 In this embodiment, a mobile phone shell surface crack detection system is proposed, which is used to perform appearance detection on the edge of the mobile phone shell 8, and perform analysis and quantitative evaluation. The mobile phone shell surface crack detection system includes:

[0035] The workbench 1 can be two supporting beam structures fixedly arranged in parallel with each other. The two supporting beam structures are fixedly connected by multiple connecting rods to form a stable supporting foundation. The specific structure is the prior art and will not be described in detail here. The workbench 1 can be installed in the sampling inspection station. At this time, the mobile phone shell 8 needs to be placed in the specified position manually or by a manipulator. The specific details will not be described here. The workbench 1 can also be installed on the processing and production line of the mobile phone shell 8. The processed mobile phone shell 8 can be directly placed on the workbench 1 for inspection, so that a full inspection can be performed. The four corners of the workbench 1 can be fixedly connected with support legs, and the bottom of the support legs can be fixedly provided with a fixing plate with mounting holes. Bolts can pass through the mounting holes to fix the workbench 1 on the production line or on the ground of the sampling inspection station.

[0036] The conveyor belt 2 is rotatably arranged on the workbench 1, and is used to convey the mobile phone shell 8. At this time, we can set the conveying direction of the mobile phone shell 8 to the longitudinal direction, that is, the conveying direction of the conveyor belt 2, and define the transverse direction as the horizontal direction perpendicular to the longitudinal direction. The conveyor belt 2 can also be a conveying chain structure, which will not be described in detail here. The conveyor belt 2 is between two supporting beam structures, one end of the conveyor belt 2 is a feeding station, and the other end is a discharging station. The conveying direction of the conveyor belt 2 is from the feeding station to the discharging station, the feeding station is at the feeding end, and the discharging station is at the other end. A mobile phone shell placement seat 4 is rotatably arranged on the conveyor belt 2, and the mobile phone shell placement seat 4 is used to place the mobile phone shell 8. The number of the mobile phone shell placement seats 4 can be one or more, and can be set according to actual needs. When the mobile phone shell placement seat 4 is at the feeding station of the conveyor belt 2, the mobile phone shell 8 can be placed on the upper surface of the mobile phone shell placement seat 4 by manual or handling robots. The mobile phone shell placement seat 4 can be a circular, square or rectangular structure, among which a circular structure is preferred. The unloading station can unload the mobile phone shell 8 by gravity. Of course, the unloading station can also directly transfer the workpiece to dock, so that the mobile phone shell 8 enters the next process for processing, which will not be described in detail here. The mobile phone shell placement seat 4 is coaxially fixedly connected with a central support shaft 14, and the central support shaft 14 is rotatably connected to the conveyor belt 2. One side of the mobile phone shell placement seat 4 is the placement surface, and the central support shaft 14 is fixedly connected to the opposite side of the placement surface. When the conveyor belt 2 is transmitted at the end, the conveyor belt 2 can undergo a certain deformation, which may not affect its normal transmission and end reversal. The corresponding position of the conveyor belt 2 can be fixedly connected with a nested ring, and the central support shaft 14 is nested with the nested ring, so that the mobile phone shell placement seat 4 can rotate and complete the reversal under the drive of an external force. After the external force disappears, there is friction between the central support shaft 14 and the nested ring, thereby preventing the mobile phone shell placement seat 4 from rotating and preventing the mobile phone shell 8 from moving and causing inaccurate positioning.

[0037] The shell positioning component is used to correct the position of the mobile phone shell 8 on the mobile phone shell placement seat 4, so as to complete the positioning. When we place the mobile phone shell 8 manually or by a manipulator, the approximate position of the mobile phone shell 8 on the mobile phone shell placement seat 4 is certain, but there will be a certain error. This error will have a certain impact on the detection, which is the key to affecting the accuracy of the detection or the ability to detect. The shell positioning component can be installed on the workbench 1. The shell positioning component can be an openable and closable clamping structure or a liftable clamping structure. The specific structure is not repeated here. The shell positioning assembly can also include a central support seat 9, a positioning side clamp wing 12, a side clamp protrusion 15 and a support member 16, the side clamp protrusion 15 is fixed on the workbench 1 and is between the conveyor belts 2, the side clamp protrusion 15 can be a rod-shaped structure arranged horizontally and an arched structure whose upper surface is a circular arc protrusion fixedly connected and combined, the mobile phone shell placement seat 4 includes a central support seat 9 and a positioning side clamp wing 12, the positioning side clamp wing 12 is provided with four and symmetrically rotated and connected to the four sides of the central support seat 9, and the central support seat 9 and the positioning side clamp wing 12 constitute a placement plane. For example, it is circular, etc., and the specific details are not repeated here. The central support seat 9 is fixedly connected to the central support shaft 14, and the rotation connection point of the positioning side clamp wing 12 and the central support seat 9 is on the upper surface of the central support seat 9, so that the central support seat 9 and the positioning side clamp wing 12 can be guaranteed to constitute a placement plane, or the height of the central support seat 9 is higher than the horizontal height when the positioning side clamp wing 12 is flat, so that the edge of the mobile phone shell 8 can be fully displayed for easy detection. The bottom of the positioning side clamp wing 12 is connected with a support member 16, and the support member 16 can be fixedly connected or rotatably connected with the positioning side clamp wing 12, wherein the fixed connection is preferred. The support member 16 can include a support rod and a rotating ball, the support rod is fixedly or rotatably connected below the positioning side clamp wing 12, and the rotating ball is rotatably connected to the bottom of the support rod, and the rotating ball can reduce the friction between the side clamp protrusions 15, and can facilitate the docking of the support rod and the side clamp protrusion 15. The side clamp protrusion 15 is set at two turning positions, and the support member 16 is in sliding contact with the side clamp protrusion 15. When the support member 16 contacts the rod-shaped structure of the side clamp protrusion 15, the central support seat 9 and the upper surface of the positioning side clamp wing 12 are on a horizontal plane. The support member 16 contacts the arched structure of the side clamp protrusion 15, and the positioning side clamp wing 12 rotates and tilts upward, which can clamp and position the mobile phone shell 8 placed on the central support seat 9. Of course, the side clamping protrusion 15 can also be directly lifted upward by the arched structure, so that the position of the mobile phone shell 8 on the central support seat 9 is corrected. When the mobile phone shell placement seat 4 rotates and changes direction, the other opposite sides of the mobile phone shell 8 are also clamped and positioned. When the positioning side clamping wings 12 are tilted upward, the tilt of the mobile phone shell 8 can be rotated and corrected and the mobile phone shell 8 can be pushed to the position between the positioning side clamping wings 12. Of course, the width of the central support seat 9 can also be smaller than the width of the mobile phone shell 8, but it is better if the width of the mobile phone shell 8 is not equal to the width of the central support seat 9.The upper surface of the central support seat 9 can be fixedly provided with an anti-skid support layer 10, which can increase the friction of the mobile phone shell 8. At this time, the width of the central support seat 9 is smaller than the width of the mobile phone shell 8. The positioning side clamping wing 12 is tilted upward, which can make the mobile phone shell 8 separate from the anti-skid support layer 10, which is convenient for adjusting the position of the mobile phone shell 8. When the positioning side clamping wing 12 rotates downward, the mobile phone shell 8 falls on the anti-skid support layer 10, and the anti-skid support layer 10 can limit the position change of the mobile phone shell 8 to the maximum extent. When we place the mobile phone shell 8, the long side of the mobile phone is generally placed parallel to the conveyor belt 2, so as to facilitate placement and positioning.

[0038] The long side micro camera unit 5 is installed on the workbench 1, and is used to photograph the long side of the mobile phone housing 8 to obtain a long side microphotograph. Two long side micro camera units 5 can be relatively arranged, and are respectively fixedly arranged on both sides of the conveyor belt 2. The long side micro camera unit 5 can take microphotographs of the long side of the mobile phone housing 8. The height of the long side micro camera unit 5 needs to be the same as the height of the mobile phone housing 8, so as to facilitate targeted shooting. In order to facilitate shooting and processing, an illuminating lamp can be arranged at the corresponding position of the long side micro camera unit 5, and the illuminating lamp can illuminate the mobile phone housing 8 when shooting, so as to facilitate subsequent processing. A shielding shell 3 is also fixedly arranged on the workbench 1. The setting of the shielding shell 3 avoids interference of external light on the detection, thereby increasing the accuracy of the detection.

[0039] The rotating assembly is used to rotate the mobile phone shell placement seat 4 by 90 degrees, thereby rotating the edge of the mobile phone shell 8 on the mobile phone shell placement seat 4 by 90 degrees. The long side of the mobile phone shell 8 is made perpendicular to the longitudinal direction, which is convenient for detecting the short side of the mobile phone shell 8. The rotating assembly can include a side-changing drive member 13 and a steering drive member 7, the side-changing drive member 13 is coaxially fixedly connected to the central support shaft 14, and the inner side of the workbench 1 is fixedly provided with a steering drive member 7, the side-changing drive member 13 can be a gear structure, and the steering drive member 7 can be a gear rod. When the mobile phone shell placement seat 4 moves to a relative position, the steering drive member 7 is engaged with the side-changing drive member 13, and the steering drive member 7 drives the side-changing drive member 13 to rotate, thereby rotating the central support seat 9, and the length of the steering drive member 7 is 1 / 4 of the outer diameter of the side-changing drive member 13, so that the mobile phone shell placement seat 4 can be rotated by 90 degrees.

[0040] The short-side micro-camera unit 6 is installed on the workbench 1 and is used to photograph the short side of the mobile phone casing 8 to obtain a short-side microscopic photograph. Two short-side micro-camera units 6 can be arranged opposite to each other and fixedly arranged on both longitudinal sides of the conveyor belt 2 respectively. The short-side micro-camera unit 6 can take microscopic photographs of the short side of the mobile phone casing 8.

[0041] The reset component is connected to the mobile phone shell placement seat 4 and is used to rotate the mobile phone shell placement seat 4 90 degrees in the opposite direction. The reset component can be a rack structure and is fixedly installed on the workbench 1. The details are not repeated here.

[0042] The controller is electrically connected to the conveyor belt 2, the long side micro camera unit 5 and the short side micro camera unit 6. The controller is used to control the conveyor belt 2 to convey. The controller is used to control the long side micro camera unit 5 and the short side micro camera unit 6 to shoot the long side and short side of the mobile phone shell 8 to obtain microscopic photos, and the microscopic photos include long side microscopic photos and short side microscopic photos. The specific process may include: the controller controls the conveyor belt 2 to convey, and the mobile phone shell 8 is placed on the mobile phone shell placement seat 4 of the feeding station. At this time, the support member 16 contacts the rod-shaped structure of the side clamp protrusion 15, and the upper surface of the central support seat 9 and the positioning side clamp wing 12 is on the same horizontal plane. As the mobile phone shell placement seat 4 conveys, the support member 16 contacts the arched structure of the side clamp protrusion 15, and the positioning side clamp wing 12 rotates and tilts upward, which can clamp the mobile phone shell 8 placed on the central support seat 9 to complete the long side positioning. The long side micro camera unit 5 photographs the long side of the mobile phone shell 8 to obtain the long side microscopic photos. As the mobile phone shell placement seat 4 continues to be transported with the conveyor belt 2, the steering drive member 7 engages with the side-changing drive member 13, and the steering drive member 7 drives the side-changing drive member 13 to rotate, thereby rotating the central support seat 9 by 90 degrees, so that the mobile phone shell 8 is placed horizontally. As the mobile phone shell placement seat 4 is transported, the support member 16 contacts the arched structure of the side clamp protrusion 15, and the positioning side clamp wing 12 rotates and tilts upward, which can clamp the mobile phone shell 8 placed on the central support seat 9 to complete the short side positioning. The short side micro camera unit 6 photographs the short side of the mobile phone shell 8 to obtain a short side microphotograph. The controller is used to construct a spatial coordinate system, and the controller processes the microphoto to obtain a crack image, and inserts the crack image into the spatial coordinate system accordingly. The microphoto processing method can include black and white-high contrast-finding edges, etc., which can clearly display the cracks in the microphoto. The controller calculates the crack image to obtain the crack width, and can start sorting from one end. The details are not repeated here. Cracks are filtered and displayed when the crack width is greater than one W 标 The crack width is greater than W 标 The cracks are numbered to obtain the crack width W i , where i is the crack sequence number, and the controller calculates the length L of each crack i , where the crack width W i and crack length L i The calculation method of is prior art and will not be described in detail here. The controller outputs the crack coordinates (x i ,y i , z i , W i , Li ) Calculate and obtain crack evaluation parameters, which may include crack appearance and crack impact value Where i is the crack sequence number, I is the total number of cracks, i = 1, 2┈, I; ɑ i is the position tolerance coefficient, which can be obtained by looking up the information table according to the location of the crack. The information table can be made in advance based on experience, and the details will not be repeated here. The calculation by this method can fully evaluate the crack width and length, and can also evaluate the numerical influence trend of the crack width. The calculation is accurate and the characterization is precise. For example, the position tolerance coefficients in the middle and corner of the edge are different. Our requirements for the edge are higher, and the position tolerance coefficient value will be smaller. For the convenience of calculation, we can average the four sides, and the position tolerance coefficient value can be 1. Of course, other situations are not excluded. The units of coordinates, crack length and width are all millimeters. For example, there are two scratches on the long side of the mobile phone casing 8, namely the coordinates (3, 0.3, 0.2) and (3, 3.6, 0.5). The width and length of the scratch crack obtained by processing are W respectively. 1 =0.5, W 2 =0.3, L 1 =1.1, L 2 =2.1, then the scratch crack coordinates can be obtained as (3, 0.3, 0.2, 0.5, 1.1) and (3, 3.6, 0.5, 0.3, 2.1). 标 is 0.4, and w is obtained by calculation 1 =0.25, w 2 =-0.25, calculate the crack influence value K = (e 0.25 *1.1) / 1+(e -0.25 *2.1) / 1=3.05. The edge of the mobile phone housing 8 is evaluated by the crack evaluation parameter. The crack impact value K is compared with a preset K 标 For comparison, K 标 It can be 10. If 3.05 is less than 10, the crack impact is qualified. When the crack impact value K is greater than or equal to K 标 When it is, it is defined as a defective product. Defective products can be evaluated by setting multiple levels of quality, for example, first-level defective products, second-level defective products, etc., for graded processing. The details are not repeated here. Similarly, the crack visibility can be evaluated. The details are not repeated here. By displaying the crack coordinates, the position and quantity can be displayed clearly, which is convenient for taking countermeasures for the processing procedures at the corresponding positions of the processing production line. By evaluating the crack influence value K and quantifying the evaluation value, the appearance can be evaluated more objectively and accurately, and the evaluation ability is strong.

[0043] Example 2

[0044] refer to Figure 5 , the rotating assembly may include a missing edge gear and a sliding drive rod, the missing edge gear is coaxially fixedly connected to the central support shaft 14, the missing edge gear is an incomplete gear, including a tooth pattern portion 18 and a tooth pattern portion 19, the tooth pattern portion 18 and the tooth pattern portion 19 have the same arc and are arranged in four sections, and are evenly spaced on the missing edge gear. The sliding drive rod is fixedly connected to the workbench 1, and the sliding drive rod includes a slide bar portion 19 and a tooth bar portion 20, the slide bar portion 19 and the tooth bar portion 20 are fixedly connected and in the longitudinal direction, and the length of the tooth bar portion 20 is the same as the length of the tooth pattern portion 18. When the mobile phone shell placement seat 4 does not need to rotate, the notch portion 17 slides in contact with the slide bar portion 19, so that the angle of the mobile phone shell placement seat 4 can be limited, and when the mobile phone shell placement seat 4 moves the tooth bar portion 20, the tooth pattern portion 18 meshes with the tooth bar portion 20, and the tooth bar portion 20 pushes the tooth pattern portion 18 to rotate, thereby rotating the mobile phone shell placement seat 4. Make the mobile phone shell placement seat 4 accurately positioned and the rotation angle accurate, which is convenient for detection.

[0045] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A mobile phone housing surface crack detection system, characterized in that: The mobile phone housing surface crack detection system comprises: Workbench; A conveyor belt is rotatably arranged on a workbench and is used to convey the mobile phone shell; a mobile phone shell placement seat is rotatably arranged on the conveyor belt, and the mobile phone shell placement seat is used to place the mobile phone shell; A housing positioning assembly, which is used to correct the position of the mobile phone housing on the mobile phone housing placement seat to complete the positioning; A long side micro camera unit is installed on the workbench and is used to take a picture of the long side of the mobile phone housing to obtain a long side microscopic picture; A rotating assembly is mounted on the workbench and connected to the mobile phone shell placement seat, and is used to rotate the mobile phone shell placement seat 90 degrees; A short-side micro-camera unit is installed on the workbench and is used to photograph the short side of the mobile phone housing to obtain a short-side microscopic photograph; A reset assembly is installed on the workbench and connected to the mobile phone shell placement seat, and is used to reversely rotate the mobile phone shell placement seat by 90 degrees; The controller is electrically connected to the conveyor belt, the long side micro camera unit and the short side micro camera unit. The controller is used to control the conveyor belt to convey, and control the long side micro camera unit and the short side micro camera unit to shoot the long side and the short side of the mobile phone shell to obtain microscopic photos, and the microscopic photos include long side microscopic photos and short side microscopic photos; the controller constructs a spatial coordinate system, processes the microscopic photos to obtain crack images, and inserts the crack images into the spatial coordinate system accordingly; the controller calculates the crack images to obtain crack widths, filters the cracks and displays crack widths greater than one W 标 The cracks are numbered and the crack width W is obtained. i , where i is the crack sequence number; calculate the length L of each crack i , the controller outputs the crack coordinates (x i ,y i , z i , W i , L i ), calculate and obtain crack evaluation parameters, and evaluate the edge of the mobile phone shell according to the crack evaluation parameters; Crack evaluation parameters include crack appearance w i and crack impact value K; Crack visibility Crack Impact Value Where i is the crack sequence number, I is the total number of cracks, i = ,┈,I;ɑ i is the position tolerance factor.

2. A mobile phone housing surface crack detection system according to claim 1, characterized in that: The corresponding position of the conveying belt is fixedly connected with a nesting ring, and the bottom of the mobile phone shell placement seat is fixedly connected with a central support shaft, and the central support shaft is nested and matched with the nesting ring.

3. A mobile phone housing surface crack detection system according to claim 1, characterized in that: The shell positioning assembly includes a central support seat, positioning side clamping wings, side clamping protrusions and a support member. The side clamping protrusions are fixed on the workbench and are located between the conveyor belts. The side clamping protrusions are a combination of a horizontally arranged rod-like structure and an arched structure with a circular arc protrusion on its upper surface, which is fixedly connected. Four positioning side clamping wings are provided and symmetrically connected to the four sides of the central support seat for rotation, and the central support seat and the positioning side clamping wings form a placement plane. The central support seat is fixedly connected to the central support shaft, and the rotation connection points of the positioning side clamping wings and the central support seat are located on the upper surface of the central support seat. The bottom of the positioning side clamping wings is connected to the support member; when the support member contacts the arched structure of the side clamping protrusion, the positioning side clamping wings rotate and tilt upward to clamp and position the mobile phone shell placed on the central support seat.

4. A mobile phone housing surface crack detection system according to claim 3, characterized in that: The support member comprises a support rod and a rotating ball. The support rod is fixedly or rotationally connected below the positioning side clamping wing, and the rotating ball is rotationally connected to the bottom of the support rod.

5. A mobile phone housing surface crack detection system according to claim 3, characterized in that: An anti-skid support layer is fixedly arranged on the upper surface of the central support seat, and the anti-skid support layer is used to increase the friction of the mobile phone shell.

6. A mobile phone housing surface crack detection system according to claim 1, characterized in that: The rotating assembly includes a side-changing drive and a steering drive. The side-changing drive is coaxially fixedly connected to the central support shaft. The steering drive is fixedly arranged on the inner side of the workbench. The side-changing drive is a gear structure, and the steering drive is a gear rod. When the mobile phone shell placement seat moves to a relative position, the steering drive engages with the side-changing drive, and the steering drive drives the side-changing drive to rotate. The length of the steering drive is 1 / 4 of the outer diameter of the side-changing drive.

7. A mobile phone housing surface crack detection system according to claim 1, characterized in that: Illuminating lamps are arranged at corresponding positions of the long-side micro-camera unit and the short-side micro-camera unit.

8. A mobile phone housing surface crack detection system according to claim 7, characterized in that: A shielding shell is also fixedly arranged on the workbench.

9. A mobile phone housing surface crack detection system according to claim 1, characterized in that: The rotating assembly includes a missing edge gear and a sliding drive rod. The missing edge gear is coaxially fixedly connected to the central support shaft. The missing edge gear is an incomplete gear, including a toothed portion and a toothed portion. The toothed portion and the toothed portion have the same curvature and are provided with four sections, which are evenly spaced on the missing edge gear. The sliding drive rod is fixedly connected to the workbench. The sliding drive rod includes a sliding rod portion and a toothed rod portion. The sliding rod portion and the toothed rod portion are fixedly connected and are in the longitudinal direction. The length of the toothed rod portion is the same as the length of the toothed portion.

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