A visual inspection system and method for preventing leakage of wire thread inserts

Abstract

The present invention discloses a visual inspection system and method for preventing leakage of wire screw inserts, which mainly solves the technical problem that although the existing wire screw insert leakage inspection can intuitively display the inspection results, it still needs to rely on manual judgment to determine whether it is installed in place, which not only leads to a large workload for the staff, but also has a low inspection efficiency. It includes a host computer, a lower computer electrically connected to the host computer, a mechanical arm arranged on one side of an external conveying device, a lifting and rotating mechanism arranged on the external conveying device at a position corresponding to the mechanical arm, a detection module arranged at the working end of the mechanical arm, and an incoming material sensing switch arranged on the lifting and rotating mechanism for sensing the workpiece to be inspected and a workpiece model identifier for identifying the model of the workpiece to be inspected; the detection module includes an image acquisition device installed on the working end of the mechanical arm, a visual light source, and a detection unit stored in the host computer.

Description

Technical Field

[0001] The invention relates to a visual inspection system and method, and in particular to a visual inspection system and method for preventing leakage of a wire thread sleeve. Background Art

[0002] In order to enhance the thread strength of the aluminum alloy shell and increase the number of repeated disassembly and assembly, the industry generally adopts the method of installing wire thread inserts in the threaded holes of the aluminum alloy shell. In order to prevent the phenomenon of missing wire thread inserts, the operator is required to perform self-inspection and mark the aluminum alloy shell after installing the wire thread insert, and then the inspector will conduct random inspection.

[0003] Chinese patent CN111854826B discloses a tool for detecting missing installation of wire screw sleeves on motor end covers, including a support plate, in which through holes are arranged one by one corresponding to the bolt holes in the motor end cover, each bolt hole in the motor end cover is used to install the wire screw sleeve, and a detection pin is slidably installed in each through hole, the outer diameter of the detection pin is smaller than the inner diameter of the bolt hole and larger than the inner diameter of the wire screw sleeve, a spring is sleeved on the outer part of the lower end of the detection pin, an annular expansion portion for retracting the spring is arranged on the lower end surface of the support plate, at least one handle is fixed on the upper end surface of the support plate, a channel for embedding a protrusion on the motor end cover is arranged in the middle of the support plate, and a circumferential limiting structure is arranged between the support plate and the motor end cover.

[0004] However, although the existing wire thread sleeve leakage prevention detection can intuitively display the detection results, it still needs to rely on manual judgment to determine whether it is installed in place, which not only leads to greater workload for staff, but also low detection efficiency. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem that although the existing wire thread insert anti-leakage detection can intuitively display the detection results, it still needs to rely on manual judgment whether it is installed in place, which not only leads to high workload for staff but also low detection efficiency, and to provide a wire thread insert anti-leakage visual detection system and method.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A visual inspection system for preventing leakage of a wire screw insert is characterized in that it comprises an upper computer, a lower computer electrically connected to the upper computer, a mechanical arm arranged on one side of an external conveying device, a lifting and rotating mechanism arranged on the external conveying device at a position corresponding to the mechanical arm, a detection module arranged at a working end of the mechanical arm, and an incoming material sensing switch arranged on the lifting and rotating mechanism for sensing a workpiece to be detected and a workpiece model identifier for identifying the model of the workpiece to be detected;

[0008] The lifting and rotating mechanism includes a driving assembly arranged at the lower side of the external conveying device and a placing plate arranged at the output end of the driving assembly;

[0009] The incoming material sensing switch and the workpiece model identifier are both arranged on the placement plate of the lifting and rotating mechanism; a lifting port adapted to the placement plate is provided on the external conveying device, which is used for lifting and rotating the placement plate, and the workpiece to be detected is placed at the corresponding position on the external conveying device;

[0010] The detection module includes an image acquisition device installed on the working end of the robot arm for acquiring image information of the workpiece to be detected, a visual light source for providing strong light illumination for the image acquisition device, and a detection unit stored in the host computer;

[0011] The robotic arm, driving assembly and visual light source are electrically connected to the lower computer respectively, the workpiece model identifier and incoming material sensing switch are electrically connected to the upper computer, and the image acquisition device is electrically connected to the lower computer and the upper computer respectively; the detection unit obtains the minor diameter size information of the threaded hole on the workpiece to be detected based on the image information collected by the image acquisition device, and compares the information with the corresponding workpiece model detection parameters preset in the detection unit to obtain the detection result, and the upper computer determines whether the wire screw sleeve is missing based on the detection result.

[0012] Further, the driving assembly includes a rotation driving unit, a lifting driving unit, a transmission shaft arranged vertically in an axial direction, a base arranged horizontally, and a mounting plate arranged parallel to and above the base;

[0013] The rotary drive unit includes a drive motor installed on the lower side of the mounting plate and a reducer whose input end is connected to the output end of the drive motor; the output end of the reducer is connected to one end of the transmission shaft; a through hole corresponding to the transmission shaft is provided on the mounting plate, and the other end of the transmission shaft passes through the through hole and is connected to the placement plate;

[0014] The lifting drive unit includes a plurality of guide assemblies and a plurality of cylinders mounted on a base; the output ends of the cylinders are connected to the lower side of the mounting plate;

[0015] The driving motor and the cylinder are connected to the lower computer respectively.

[0016] Further, the guide assembly includes a guide rail and a guide rod slidably connected to the guide rail;

[0017] The axial direction of the guide rod is arranged parallel to the axial direction of the transmission shaft, the lower end of the guide rail is connected to the base, the upper end of the guide rod is connected to the mounting plate, and the lower end passes through the base and is slidably connected thereto.

[0018] Furthermore, it also includes a plurality of bearings and a sleeve mounted on the transmission shaft; the rotating ends of the plurality of bearings are connected to the outer circumference of the transmission shaft, and the fixed ends are connected to the inner circumference of the sleeve.

[0019] Furthermore, the image acquisition device adopts an industrial camera;

[0020] The workpiece model identifier is a barcode scanner, which is used to scan the information code posted on the workpiece to be inspected to obtain the product model of the workpiece to be inspected.

[0021] Furthermore, the lower computer is a PLC controller and the upper computer is a PC.

[0022] Furthermore, the visual light source is an LED lamp with a ring structure, and the lens of the industrial camera is located within the orthographic projection range of the visual light source.

[0023] At the same time, the present invention also provides a visual detection method for preventing leakage of a wire screw insert, which is based on a visual detection system for preventing leakage of a wire screw insert, and the special feature of the method is that the method comprises the following steps:

[0024] Step 1: Place the workpiece to be inspected at a corresponding position of the external conveying device provided with a lifting port, the external conveying device conveys the workpiece to be inspected to the placement plate, and the workpiece model identifier identifies the product model of the workpiece to be inspected, the workpiece model identifier sends the identified product model to the upper computer, and the upper computer sends the identified product model to the lower computer;

[0025] Step 2: The lower computer controls the lifting and rotating mechanism to drive the workpiece to be inspected to rise to the working range of the image acquisition device;

[0026] The lower computer controls the robot arm to perform the preset trajectory according to the identified product model, controls the lifting and rotating mechanism to drive the workpiece to be inspected to rotate, and turns on the visual light source; the image acquisition device takes a picture of the position to be inspected of the workpiece to be inspected to obtain the image information of the position to be inspected of the workpiece to be inspected;

[0027] Step 4: grayscale processing is performed on the obtained image information by the detection unit, so that the solid part of the workpiece to be detected, the wire screw sleeve and the threaded hole present different grayscale values ​​in the image information, the threaded hole is identified according to the grayscale value of the threaded hole preset in the detection unit, and the minor diameter of the threaded hole is determined;

[0028] Step 5: Compare the detected threaded hole diameter size with the corresponding threaded hole diameter size preset in the detection unit; determine whether the detected threaded hole diameter size is within the preset corresponding threaded hole diameter size range; if so, there is no missing wire screw sleeve; if not, there is a missing wire screw sleeve;

[0029] Step 6: The detection unit sends the detection result to the host computer, which displays the detection result and notifies the lower computer whether the detection result is qualified according to the detection result;

[0030] The lower computer controls the lifting and rotating mechanism to move the inspected workpiece downward to the initial position; the external conveying device conveys the qualified workpiece to the qualified inspection station; and conveys the unqualified workpiece to the NG station;

[0031] Step 7: Confirm the workpiece on the NG station;

[0032] If there is no missing wire thread insert, put the workpiece into the qualified inspection station;

[0033] If the wire screw sleeve is missing, install and repair it, put the workpiece back on the placement plate after installation and repair, and return to step 1 until the test is qualified; if installation and repair cannot be performed, the workpiece will be scrapped;

[0034] Step 8: Complete the test.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention acquires image information of the workpiece to be inspected after strong light irradiation through an image acquisition device, and compares the minor diameter of the hole in the image information obtained by the detection unit with the set minor diameter of the hole after the wire screw sleeve is installed, so as to detect whether the wire screw sleeve is missing; it realizes automated and mechanized detection, and only needs manual re-inspection of a small number of unqualified workpieces, thereby reducing the work intensity of the staff; not only the detection accuracy is high, but also the efficiency is greatly improved.

[0037] 2. The drive motor is set to drive the transmission shaft to rotate through the reducer, thereby driving the placement plate to rotate. At the same time, the placement plate is driven to rise and fall through the cylinder. It can be controlled accordingly according to the specifications of different types of workpieces, and cooperate with the movement of the robotic arm to conveniently complete the leakage prevention detection of threaded holes and wire screw sleeves in various positions.

[0038] 3. The guide rails, guide rods, bearings and bushings can further improve the stability of the placement plate during movement, thereby preventing the image information from being blurred due to the instability of the workpiece, which affects the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall structure of a visual inspection system for preventing leakage of a wire screw sleeve according to the present invention; (the incoming material sensing switch and the workpiece model identifier are not shown in the figure)

[0040] Figure 2It is a structural schematic diagram of a lifting and rotating mechanism in an embodiment of a visual inspection system for preventing leakage of a wire screw sleeve of the present invention;

[0041] Figure 3 yes Figure 2 AA section view;

[0042] Figure 4 This is a control principle diagram of an embodiment of a visual inspection system for preventing leakage of a wire thread sleeve according to the present invention.

[0043] Figure 5 This is a diagram of the detection results of a visual detection system for preventing leakage of a wire thread insert according to the present invention.

[0044] In the figure, 01-transport device, 02-workpiece;

[0045] 1-mechanical arm, 2-lifting and rotating mechanism, 21-placing plate, 22-base, 23-transmission shaft, 24-mounting plate, 25-driving motor, 26-reducer, 27-cylinder, 28-guide rod, 29-guide rail, 210-bearing, 211-sleeve, 3-visual light source, 4-image acquisition device. DETAILED DESCRIPTION

[0046] In order to make the purpose, advantages and features of the present invention more clear, the following is a further detailed description of a visual inspection system and method for preventing leakage of a wire thread insert proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following specific implementation methods, the advantages and features of the present invention will be more clear.

[0047] In the description of the present invention, it should be noted that the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] After the wire screw insert is installed in the threaded hole, the hole will be smaller than that without the wire screw insert installed. For example, the minor diameter of the threaded hole of M8*1.25-6H is Ф12.32mm-Ф12.62mm before the wire screw insert is installed, and the minor diameter is Ф10.376mm-Ф10.676mm after the wire screw insert is installed. Therefore, the detection parameters corresponding to the different threaded hole specifications are prefabricated in the detection program. Different models of workpieces 02 have different thread specifications and quantities, which correspond one by one to the models of the inspected products through the detection program, so that the wire screw insert leakage prevention detection of various workpieces 02 can be met.

[0049] like Figure 1-Figure 4As shown, a visual inspection system for preventing leakage of wire thread inserts of the present invention comprises an upper computer, a lower computer (not shown in the figure) electrically connected to the upper computer, a mechanical arm 1 arranged on one side of an external conveying device 01, a lifting and rotating mechanism 2 arranged on the external conveying device 01 at a position corresponding to the mechanical arm 1, a detection module arranged at a working end of the mechanical arm 1, and an incoming material sensing switch arranged on the lifting and rotating mechanism for sensing a workpiece 02 to be detected and a workpiece model identifier for identifying the model of the workpiece 02 to be detected.

[0050] like Figure 2 and Figure 3As shown, the lifting and rotating mechanism 2 includes a driving assembly arranged on the lower side of the external conveying device 01 and a placement plate 21 arranged at the output end of the driving assembly; the driving assembly includes a rotating driving unit, a lifting driving unit, a transmission shaft 23 arranged axially and vertically, a horizontally arranged base 22, a mounting plate 24 arranged parallel to the base 22, a plurality of bearings 210 and a sleeve 211 coaxially sleeved on the transmission shaft 23; the rotating driving unit includes a driving motor 25 installed on the lower side of the mounting plate 24 and a reducer 26 whose input end is connected to the output end of the driving motor 25; the output shaft of the driving motor 25 is arranged in the horizontal direction, and the reducer 26 is a structure in which the input end and the output end are arranged vertically, and the output end of the reducer 26 is connected to the driving motor 2 5 is coaxially arranged, the output end of the reducer 26 is arranged in the vertical direction and connected to the lower end of the transmission shaft 23; a lifting port adapted to the placement plate is provided on the external conveying device 01, which is used for lifting and rotating the placement plate 21, and at the same time, the workpiece 02 to be detected is placed at the corresponding position on the external conveying device 01, and a through hole corresponding to the transmission shaft 23 is provided on the mounting plate 24, and the other end of the transmission shaft 23 passes through the through hole and is connected to the placement plate 21; the transmission shaft 23 is driven to rotate by the driving motor 25 through the reducer 26 which can change the transmission direction by 90°, thereby driving the placement plate 21 to rotate, and then the workpiece 02 can be rotated during detection for easy detection; specifically, the reducer 26 can adopt bevel gears of different sizes that mesh with each other The transmission function is realized by the existing technologies such as the combination of the gear and the worm gear structure; the lifting drive unit includes a plurality of guide components and a plurality of cylinders 27 installed on the base 22; the driving motor 25 and the cylinder 27 are respectively electrically connected to the lower machine, and the stability of the mounting plate 24 during operation can be ensured by setting a plurality of guide components. In this embodiment, there are two cylinders 27, and the two cylinders 27 are relatively arranged on both sides of the reducer 26, and the output end of the cylinder 27 is connected to the lower side of the mounting plate 24; the two cylinders 27 are synchronous cylinders 27, which ensure that they can be lifted and lowered at the same time when in use, and avoid failures caused by asynchronous operation of the cylinders 27 during work; the guide components are four in this embodiment, and the four guide components are respectively arranged at the four corners of the bottom plate. The assembly includes a guide rail 29 and a guide rod 28 slidably connected to the guide rail 29; the axial direction of the guide rod 28 is arranged parallel to the axial direction of the transmission shaft 23, the lower end of the guide rail 29 is connected to the base 22, the upper end of the guide rod 28 is connected to the mounting plate 24, and the lower end passes through the base 22 and is slidably connected thereto; the inner diameter of the sleeve 211 is adapted to the outer circumferential surface of the bearing 210, and can provide a mounting position for it. In this embodiment, there are two bearings 210, and the two bearings 210 are respectively arranged at both ends of the sleeve 211. The rotating ends of the multiple bearings 210 are connected to the outer circumferential surface of the transmission shaft 23, and the fixed ends are connected to the inner circumferential surface of the sleeve 211, which can provide radial support force for the transmission shaft 23 and ensure the stability of the transmission shaft 23 during rotation;It should be noted that the specific structure of the lifting and rotating mechanism 2 used in this embodiment is only a preferred embodiment of the present invention. In other embodiments of the present invention, those skilled in the art may also select other existing structures to realize the lifting and rotating functions of the placement plate 21, as long as they can meet the requirements of precise control and lifting stroke. ;

[0051] The incoming material sensing switch and the workpiece model identifier are both arranged on the placement plate 21; the incoming material sensing switch and the workpiece model identifier are respectively connected to the host computer, the workpiece model identifier is a barcode scanner, which is used to scan the information code posted on the workpiece to be detected 02 to obtain the product model of the workpiece to be detected 02, and the barcode scanner is electrically connected to the host computer; the incoming material sensing switch can be selected from infrared ray emitting devices or photoelectric sensing switches and other existing technologies;

[0052] like Figure 1 As shown, the detection module includes an image acquisition device 4 installed on the robot arm 1 for acquiring image information of the workpiece 02 to be detected, a visual light source 3 for providing strong light illumination for the image acquisition device 4, and a detection unit stored in the host computer; the detection unit is a prior art and is implemented by a software program; the robot arm 1 and the visual light source 3 are electrically connected to the lower computer, and the image acquisition device 4 is electrically connected to the host computer and the host computer respectively; the detection unit can obtain the minor diameter size information of the threaded hole according to the image information collected by the image acquisition device 4, and compare the information with the detection parameters of the corresponding workpiece 02 model detection program to obtain the detection result, and the host computer determines whether the wire screw sleeve is missing according to the detection result; the robot arm 1 adopts a six-axis robot arm 1, and the fixed end of the robot arm 1 is installed on the mounting seat, and the mounting seat is set on the ground next to the external conveying device 01. The working range of the arm 1 can meet the detection needs of different types of workpieces 02. The visual light source 3 is an LED lamp with a ring structure, and the lens of the industrial camera is located within the positive projection range of the visual light source 3. In the present embodiment, the image acquisition device 4 adopts an industrial camera; the lower computer is a PLC controller, and the upper computer is a PC. In other embodiments of the present invention, other products in the prior art can also be used as a substitute. When the strong light emitted by the visual light source 3 hits the surface of the workpiece 02 to be detected, due to the high surface flatness of the surface of the workpiece 02 and the wire screw sleeve, it reflects more light, while the threaded hole reflects less light. Therefore, in the image information obtained by the image acquisition device 4, the threaded hole part will have a larger shadow part, which is the range of the minor diameter of the threaded hole. The minor diameter value of the threaded hole can be obtained by detecting this range.

[0053] The following is a detection unit procedure for a workpiece according to an embodiment of the present invention:

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062] The present invention provides a visual detection method for preventing leakage of a wire screw insert, based on a visual detection system for preventing leakage of a wire screw insert, and specifically comprises the following steps:

[0063] Step 1: Place the workpiece 02 to be inspected at a corresponding position of the external conveying device 01 provided with a lifting port. The external conveying device 01 conveys the workpiece 02 to be inspected to the placement plate 21. The workpiece model identifier identifies the product model of the workpiece 02 to be inspected. The workpiece model identifier sends the identified product model to the upper computer, and the upper computer sends the identified product model to the lower computer.

[0064] Step 2: The lower computer controls the lifting and rotating mechanism 2 to drive the workpiece 02 to be inspected to rise to the working range of the image acquisition device 4;

[0065] The lower computer controls the action of the robot arm 1 according to the detection program corresponding to the identified product model, controls the lifting and rotating mechanism 2 to drive the workpiece 02 to be detected to rotate, and turns on the visual light source 3; the image acquisition device 4 takes a picture of the position to be detected of the workpiece 02 to be detected to obtain the image information of the position to be detected of the workpiece 02 to be detected;

[0066] Step 4: The detection unit performs grayscale processing on the obtained image information, so that the solid part, the wire screw sleeve and the threaded hole of the workpiece 02 to be detected present different grayscale values ​​in the image information, and the threaded hole is identified according to the grayscale value of the threaded hole preset in the detection program, and the minor diameter of the threaded hole is determined;

[0067] Step 5: Compare the detected threaded hole diameter size with the corresponding threaded hole diameter size preset in the detection program; determine whether the detected threaded hole diameter size is within the preset corresponding threaded hole diameter size range; if so, there is no wire screw sleeve missing; if not, there is a wire screw sleeve missing;

[0068] Step 6: The detection unit sends the detection result to the host computer, and the host computer displays the detection result (such as Figure 5 As shown), and inform the lower computer whether the test result is qualified according to the test result;

[0069] The lower computer controls the lifting and rotating mechanism 2 to move the inspected workpiece 02 downward to the initial position;

[0070] The external conveying device 01 conveys the qualified workpiece 02 to the qualified inspection station; and conveys the unqualified workpiece 02 to the NG station;

[0071] Step 7: Manually confirm workpiece 02 on the NG station;

[0072] If there is no missing wire screw sleeve, put the workpiece 02 into the qualified inspection station;

[0073] If the wire screw sleeve is missing, manual installation and maintenance are performed, and the workpiece 02 after installation and maintenance is put back on the placement plate 21, and the process returns to step 1 until the test is qualified; if installation and maintenance cannot be performed, the workpiece 02 is scrapped;

[0074] Step 8: Complete the test.

Claims

1. A visual inspection system for preventing leakage of wire thread inserts, characterized in that: It comprises an upper computer, a lower computer electrically connected to the upper computer, a mechanical arm (1) arranged on one side of an external conveying device (01), a lifting and rotating mechanism (2) arranged on the external conveying device (01) at a position corresponding to the mechanical arm (1), a detection module arranged at the working end of the mechanical arm (1), and an incoming material sensing switch arranged on the lifting and rotating mechanism (2) for sensing a workpiece (02) to be detected and a workpiece model identifier for identifying the model of the workpiece (02) to be detected; The lifting and rotating mechanism (2) comprises a driving assembly arranged at the lower side of the external conveying device (01) and a placing plate (21) arranged at the output end of the driving assembly; The incoming material sensing switch and the workpiece model identifier are both arranged on the placement plate (21) of the lifting and rotating mechanism (2); a lifting opening adapted to the placement plate (21) is provided on the external conveying device (01) for lifting and rotating the placement plate (21), and the workpiece (02) to be detected is placed at a corresponding position on the external conveying device (01); The detection module comprises an image acquisition device (4) installed on the working end of the mechanical arm (1) for acquiring image information of the workpiece (02) to be detected, a visual light source (3) for providing strong light illumination for the image acquisition device (4), and a detection unit stored in a host computer; The mechanical arm (1), the driving assembly and the visual light source (3) are electrically connected to the lower computer respectively, the workpiece model identifier and the incoming material sensing switch are electrically connected to the upper computer, and the image acquisition device (4) is electrically connected to the lower computer and the upper computer respectively; the detection unit obtains the minor diameter size information of the threaded hole on the workpiece (02) to be detected based on the image information collected by the image acquisition device (4), and compares the information with the detection parameters preset in the detection unit corresponding to the workpiece (02) model to obtain the detection result, and the upper computer determines whether the wire screw sleeve is missing based on the detection result; The driving assembly comprises a horizontally arranged base (22), a rotation driving unit, a lifting driving unit, an axially vertically arranged transmission shaft (23), and a mounting plate (24) arranged parallel to and above the base (22); The rotary drive unit comprises a drive motor (25) mounted on the lower side of the mounting plate (24) and a reducer (26) whose input end is connected to the output end of the drive motor (25); the output end of the reducer (26) is connected to one end of the transmission shaft (23); a through hole corresponding to the transmission shaft (23) is provided on the mounting plate (24), and the other end of the transmission shaft (23) passes through the through hole and is connected to the placement plate (21); The lifting drive unit comprises a plurality of guide assemblies and a plurality of cylinders (27) mounted on a base (22); the output ends of the cylinders (27) are connected to the lower side of the mounting plate (24); The driving motor (25) and the cylinder (27) are electrically connected to the lower computer respectively.

2. A visual inspection system for preventing leakage of wire thread inserts according to claim 1, characterized in that: The guide assembly comprises a guide rail (29) and a guide rod (28) slidably connected to the guide rail (29); The axial direction of the guide rod (28) is arranged parallel to the axial direction of the transmission shaft (23), the lower end of the guide rail (29) is connected to the base (22), the upper end of the guide rod (28) is connected to the mounting plate (24), and the lower end passes through the base (22) and is slidably connected thereto.

3. A visual inspection system for preventing leakage of wire thread inserts according to claim 2, characterized in that: It also includes a plurality of bearings (210) and a sleeve (211) coaxially sleeved on the transmission shaft (23); the rotating ends of the plurality of bearings (210) are connected to the outer peripheral surface of the transmission shaft (23), and the fixed ends are connected to the inner peripheral surface of the sleeve (211).

4. A visual inspection system for preventing leakage of wire thread inserts according to claim 3, characterized in that: The image acquisition device (4) adopts an industrial camera; The workpiece model identifier is a barcode scanner, which is used to scan the information code posted on the workpiece (02) to be detected to obtain the product model of the workpiece (02) to be detected.

5. A visual inspection system for preventing leakage of wire thread inserts according to claim 4, characterized in that: The lower computer is a PLC controller and the upper computer is a PC.

6. A visual inspection system for preventing leakage of wire thread inserts according to claim 5, characterized in that: The visual light source (3) is an LED lamp with a ring structure, and the lens of the industrial camera is located within the orthographic projection range of the visual light source (3).

7. A visual inspection method for preventing leakage of a wire thread insert, based on a visual inspection system for preventing leakage of a wire thread insert according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: placing the workpiece (02) to be inspected at a corresponding position of the external conveying device (01) provided with a lifting port, the external conveying device (01) conveys the workpiece (02) to be inspected to the placement plate (21), identifying the product model of the workpiece (02) to be inspected by a workpiece model identifier, the workpiece model identifier sends the identified product model to the upper computer, and the upper computer sends the identified product model to the lower computer; Step 2: The lower computer controls the lifting and rotating mechanism (2) to drive the workpiece to be inspected (02) to rise to the working range of the image acquisition device (4); The lower computer controls the mechanical arm (1) to perform a preset trajectory according to the identified product model, controls the lifting and rotating mechanism (2) to drive the workpiece to be inspected (02) to rotate, and turns on the visual light source (3); photographs the position to be inspected of the workpiece to be inspected (02) through the image acquisition device (4) to obtain image information of the position to be inspected of the workpiece to be inspected (02); Step 4: grayscale processing is performed on the obtained image information by the detection unit, so that the solid part, the wire screw sleeve and the threaded hole of the workpiece (02) to be detected present different grayscale values ​​in the image information, the threaded hole is identified according to the grayscale value of the threaded hole preset in the detection unit, and the minor diameter of the threaded hole is determined; Step 5: Compare the detected threaded hole diameter size with the corresponding threaded hole diameter size preset in the detection unit; determine whether the detected threaded hole diameter size is within the preset corresponding threaded hole diameter size range; if so, there is no missing wire screw sleeve; if not, there is a missing wire screw sleeve; Step 6: The detection unit sends the detection result to the host computer, which displays the detection result and notifies the lower computer whether the detection result is qualified according to the detection result; The lower computer controls the lifting and rotating mechanism (2) to move the inspected workpiece (02) downward to the initial position; the external conveying device (01) conveys the inspected workpiece (02) to the inspected qualified station; and conveys the inspected unqualified workpiece (02) to the NG station; Step 7: Confirm the workpiece (02) on the NG station; If there is no missing wire screw sleeve, the workpiece (02) is placed in the qualified inspection station; If the wire screw sleeve is missing, installation and repair are performed, and the workpiece (02) after installation and repair is placed back on the placement plate (21), and the process returns to step 1 until the test is qualified; if installation and repair cannot be performed, the workpiece (02) is scrapped; Step 8: Complete the test.

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