KR100613896B1 - The device for inspecting automobile parts using vision system - Google Patents

Abstract

The present invention relates to an apparatus for inspecting an automobile part, and more particularly, to match an image of a good car part with an image taken by a camera, which is placed in the inspection room in which light from the outside is blocked, and photographed by a camera. The present invention relates to a vehicle parts inspection device using a vision system for comparing whether or not a defect of an automobile part is compared. To this end, the present invention provides a sealed inspection room for blocking light from the outside, a jig for fixing the vehicle parts, a guide unit for moving the jig into the inspection room, a camera for photographing the vehicle parts, and the camera. It is composed of a light source for supplying a light source required for photographing, a control unit for determining whether or not the defective parts of the car parts by the image taken by the camera, and a monitor for displaying the image taken by the camera. The present invention configured as described above has an advantage that the defect of the auto parts can be automatically inspected by the control unit by comparing the image of the inspection target photographed by the camera with the preset inspection target image.

Automotive parts, vision system, camera

Description

Automotive parts inspection system using vision system {THE DEVICE FOR INSPECTING AUTOMOBILE PARTS USING VISION SYSTEM}

1 is a front internal view of a vehicle parts inspection device using a vision system according to the present invention.

Figure 2 is a side inside view of the vehicle parts inspection device using a vision system according to the present invention.

Figure 3 is an internal side view of the opening and closing door of the vehicle parts inspection device using the vision system according to the present invention.

4 is a detailed view of a jig according to the present invention.

Figure 5 is a block diagram showing the withdrawal of the guide bar according to the present invention.

Figure 6 is an exemplary view of the inspection of the seat cushion according to the present invention.

7A and 7B are exemplary views of monitor output and printer output according to the present invention.

<Description of Symbols for Major Parts of Drawings>

10-Inspection room 11-Opening and closing door

12-Monitor protective glass 13-Fixed guide

20-Jig 21-Jig Pin

22-Product presence sensor 23-Electromagnet

30-guide part 31-pedestal

32-Guide Bar 33-Guide Locking Bar

34-Opening and closing sensor 35-Marker

40-Camera 41-Center Camera

42-left camera 43-right camera

50-Lighting 60-Controls

70-Monitor 80-Printer

The present invention relates to an apparatus for inspecting an automobile part, and more particularly, to match an image of a good car part with an image taken by a camera after placing the car part, which is an inspection object, in an inspection room where light from the outside is blocked. The present invention relates to a vehicle parts inspection device using a vision system for comparing whether or not a defect of an automobile part is compared.

To make a car, more than 20,000 parts need to be assembled, and any missing one can cause serious accidents. If parts are bulky, it's easy to see if they're missing, but missing small parts like nuts is hard to find.

In addition, products such as Seat Cushion Stay and Seat Cushion among these automobile parts have a number of holes. Finding bad is difficult.

Therefore, conventionally, in the final process of parts production, the proximity sensor was used to inspect the defects of the parts. Although the defect rate was reduced by the introduction of the inspection apparatus using the proximity sensor, all the accessories of the gusset were used. There was a problem that can not be checked.

In addition, in order to improve the disadvantage of the inspection apparatus using the proximity sensor, conventionally divided the inspection area of the gusset using two cameras, the first camera inspects the nut and the support bracket, the second camera is the floating nut, plate and There was an inspection apparatus using a vision system for inspecting the support bracket, but in this case, there was a problem of inconvenient work and deterioration of work efficiency by the camera installed in the work line.

In addition, when the automotive parts to be inspected are directly exposed to the external environment, the image of the automobile parts photographed by the camera may be uneven due to the welding spark generated at the work site or the lighting change caused by the worker's movement. there was.

In addition, the parts inspection equipment using the vision system is conventionally used for semiconductor wafer inspection, PCB substrate search, or drug inspection, but these parts inspection equipment is expensive and the algorithm is limited to a specific industry, so it is difficult for small and medium companies to introduce it. There was a difficulty. In addition, there are many parts up to 20,000 and the process is diverse, which makes it more difficult for auto parts that require a new algorithm for each part.

Accordingly, the present invention has been made to solve the above-mentioned problems, and compares the image taken by the camera with the image of a predetermined good car parts, the vision system equipped with a camera and a microprocessor to check whether the inspection target defects It is to provide a vehicle parts inspection device.

It is another object of the present invention to provide an automotive parts inspection device using a vision system in which the inspection device is configured in a layered structure so as to minimize the volume thereof so as not to disturb the work line of the worker.

Still another object of the present invention is to provide an enclosed inspection room in which illumination is supplied uniformly to supply a light source for photographing so that an image taken by the camera is not uniformed by an irregular external light source such as a welding spark generated in a working environment. An object of the present invention is to provide an automobile parts inspection device using the provided vision system.

Still another object of the present invention is to provide a vehicle parts inspection apparatus using a vision system provided with a jig for fixing a part to be inspected for each part.

The present invention for achieving the above technical problem, in the automotive parts inspection apparatus using a vision system for inspecting the automotive parts by the image taken by the camera, to block the light from the outside introduced during the inspection of the automotive parts One or more cameras installed in the inspection room for photographing the vehicle parts, a jig for placing the lower part of the inspection room to fix the vehicle parts, a guide part for moving the jig into the inspection room, And receiving lights installed in the inspection room and images of automobile parts photographed by the camera in order to supply a light source for photographing the camera, and receiving the coordinate values of the photographed image and a preset photographing screen of the inspection target. A control unit for determining whether a vehicle part is defective by comparing coordinate values of a corresponding image; By the operation signal unit it will be configured to include a monitor for displaying information related to the photographed image of the motor vehicle parts.

Another feature of the present invention is the camera is spaced apart from the jig is installed in the fixed guide provided in the inspection room, the central camera for photographing the upper side of the car parts, the left camera for photographing the upper left side, and the upper right side It consists of the right camera to shoot.

Another feature of the present invention is a jig pin that is inserted into the hole of the car parts to seat the jig, the product presence sensor for determining whether the car parts are seated in the jig, and the car seated on the jig pin It is configured to include an electromagnet for fixing a part.

Another feature of the present invention is that the jig is provided with each of the vehicle parts to be inspected.

Another feature of the present invention is that if the car parts are determined to be defective in the control unit, a buzzer sounds and a red light is activated to warn the occurrence of the defective items, and the marking means indicates that the car parts are defective.

Still another feature of the present invention is a printer further capable of printing a photographing screen of the defective product.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying exemplary drawings.

1 and 2 show the inside of the front and side of the vehicle parts inspection apparatus, the present invention is sealed inspection room 10 to block the light from the outside, and jig 20 for fixing the vehicle parts And a guide unit 30 for moving the jig into an inspection room, a camera 40 for photographing the vehicle parts, an illumination 50 for supplying a light source for photographing the camera, and a photographed by the camera. The controller 60 is configured to determine whether an automobile part is defective by an image, and a monitor 70 which displays an image captured by the camera.

The inspection room 10 is configured to seal the surroundings in order to minimize the influence of light introduced from the outside when inspecting the automotive parts. At this time, an opening / closing door 11 for inserting an automobile part to be inspected into the inspection room is installed on one surface of the inspection room 10, and the monitor protection glass 12 on which the screen of the monitor is visible is provided on one surface. It is installed and the monitor 70 is installed on the back.

The jig 20 is installed in the lower part of the inspection room 10 to fix the vehicle parts to be inspected and placed on a pedestal. At this time, the jig 20 is a plurality of jig pins 21 to be fitted in the hole of the car parts to secure the car parts, as shown in Figure 4, the jig pins 21 in the holes of the car parts It is configured to include a product presence sensor 22 is inserted and determines that the part is seated in the correct position, and the electromagnet 23 for fixing the part placed on the jig.

The jig 20 is provided for each vehicle component to be inspected, and in this case, the jig pin 21 is formed at a position suitable for fixing the automobile component according to a position where a hole is formed in each automobile component.

The product presence sensor 22 is formed on the upper surface of the jig 20 so as to detect that the hole of the vehicle component is correctly fitted to the jig pin 21 and seated on the jig, and transmits the detection signal to the controller. Is connected to the control unit 60.

The electromagnet 23 is composed of a normal electromagnet which is magnetized by the supply of current and returns to its original state when the supply of current is cut off. At this time, the current supply to the electromagnet 23 is supplied from the control unit when a signal for detecting that the product is seated on the jig 20 is transmitted from the product presence sensor 22, and determines whether the car parts are defective It is preferable that the control unit is configured to block the supply of current when a signal is generated.

As illustrated in FIG. 5, the guide part 30 includes a pedestal 31 on which the jig is placed and the pedestal 31 to move the auto parts to the inspection room by moving the pedestal 31 back and forth. 31, a guide bar 32 connected to the motor, a motor providing power to move the guide bar 32, and a guide fixing bar 33 into which the guide bar moved by the power of the motor is inserted. do.

The pedestal 31 is formed in a plate shape at the bottom of the jig so that the jig and the vehicle parts seated thereon are placed and supported thereon. At this time, the jig is preferably provided with a coupling means that can be fixed to the pedestal. In addition, the pedestal 31 is installed on the rear of the opening and closing door 11 to allow entry into and out of the inspection room, and is connected to the guide bar 32 for moving the pedestal back and forth.

The guide bar 32 is a conventional bar that is connected to the pedestal 31 and can be moved to the outside by a power source as shown in FIG. 3, and the motor is a linear that provides power to move the guide bar. It consists of a motor. At this time, of course, the guide bar and the motor may be composed of a conventional pneumatic piston.

The guide fixing bar 33 is provided with a storage space into which the guide bar 32 moving into the test chamber 10 by the power of the motor is fixed to the bottom surface of the test chamber 10.

At this time, the opening and closing detection sensor 34 for detecting that the movement of the guide bar is completed at one end of the guide fixing bar 33 is preferably provided.

The opening and closing detection sensor 34 is a sensor for generating a signal for recognizing that one end of the guide bar 32 is grounded to the opening and closing detection sensor 34 provided in the guide fixing bar while the guide bar is inserted into the opening and closing detection sensor ( When the ground signal is generated at 34), the control unit cuts off the power supply to the motor to stop the movement of the guide bar 32, and when the determination of the defective parts of the car parts is finished, the controller supplies power to the motor from the control unit. Power is generated to move the bar 32.

In addition, it is preferable that the marker 35, which is a display means capable of displaying whether or not the vehicle parts to be inspected on the guide part 30, is provided.

In addition, the marker 35 is installed on one side of the guide fixing bar 33 as a display means for displaying the inspection result on the vehicle part to be inspected, and the jig to display the inspection result on the bottom surface of the vehicle part. 20 is installed below. At this time, the marker 35 is composed of a good marking device that can indicate good and a bad marking device that can indicate that the poor.

The camera 40 is composed of a CCD camera installed in the fixed guide 13 in the upper part of the inspection room 10 to inspect the vehicle parts, and is installed on the jig in which the vehicle parts to be inspected are placed.

At this time, in order to increase the accuracy of the inspection, the camera 40 is spaced apart from the jig 20 is installed in the fixed guide 13 provided in the inspection room, the central camera 41 for photographing the upper center of the car parts And a left camera 42 for photographing the upper left side, and a right camera 43 for photographing the upper right side.

In addition, the camera 40 is connected to the control unit 60 to transmit the image to the control unit to compare the images taken by the camera.

The lighting 50 is composed of a lighting lamp installed in the fixing guide 13 in the upper portion of the inspection room 10 to supply a light source for photographing the automotive parts in the inspection room. At this time, the illumination 50 is provided between the central camera and the left camera, as shown in Figure 1 in order to supply uniform illumination to the center, left and right cameras, the center camera and the right camera One is installed in between.

The control unit 60 is composed of a microprocessor for receiving an image of the vehicle parts photographed and transmitted by the camera and comparing the preset image of the automobile parts with a predetermined image to determine whether the inspection object is defective. The controller 60 is connected to the camera 40 and to the monitor 70 to display an image captured by the camera on the monitor.

In addition, there is provided a memory for storing the image of the automotive parts that are determined to be defective because the image of the automotive parts to be inspected does not match the preset image of the good automotive parts, and the printer to output the image of the defective automotive parts to the printer ( 80). In addition, a buzzer and a warning light are connected to the control unit 60 so as to sound a warning buzzer and a warning light indicating that the vehicle parts are defective.

In addition, it receives the product seating signal transmitted from the jig 20, supplies current to the electromagnet 23, moves the guide bar, operates the camera, turns on the lights, and controls all signals in the inspection apparatus. .

The monitor 70 is composed of a general monitor for displaying the relevant information and inspection date and time of the automobile parts to be inspected, the image of the automotive parts taken by the camera and the location where the defect occurred, and is connected to the controller 60 It is installed on the front of the inspection room (10). In this case, it is preferable that the LCD monitor is configured with a small volume for the integration of the vehicle parts inspection device.

In addition, a printer 80 capable of printing the inspected image may be connected to the controller 60.

In the above embodiment, the inspection room 10 is formed in a five-layer structure, and a camera, an illumination, a jig, and a guide unit for inspecting a vehicle part are installed on the uppermost floor, and a signal is inputted to the control unit and inspected on the lower floor. A keyboard is installed as an input means for inputting and programming good-quality photographing information suitable for an automobile part, and a printer for printing an image taken by the camera is installed on the lower floor, and a control unit is installed on the lower floor. The lower floor is provided with a space for storing defective products.

This layer structure is intended to minimize the space occupied in the workplace by reducing the volume of the vehicle parts inspection device, but may be configured in a different form.

Next, the operation of the present invention configured as described above will be described.

First, the seat cushion is selected as an automobile part to be inspected, and a suitable jig 20 on which the seat cushion to be inspected can be seated is coupled to the pedestal 31, and an image of the seat cushion of the good is photographed. After storing in the control unit 60, as shown in Figure 6, the position and the number of holes and nuts of the seat cushion that is the contents to be inspected, the position and number of the welding spot, the presence or absence of spring, the presence of rubber packing, and the bracket pin Program the coordinate values of the good-quality photographed images related to the presence of a hole and a bracket hole.

The seat cushion to be inspected is placed on the jig so that the jig pin 21 is inserted into some holes of the seat cushion and seated on the jig 20. Thereafter, a signal detecting that the inspection object is seated on the jig is transmitted from the product presence sensor 22 to the controller 60, and the controller receives the current to supply the current to the electromagnet 23. The electromagnet is magnetized by the supply of current, and the inspection table is fixed to the jig 20.

When the inspection object is seated and fixed to the jig 20 in this manner, the guide bar 32 is moved by the driving of the motor, and the jig enters the inspection room. When the movement of the guide bar is completed, the opening and closing door 11 is closed and the inspection room 10 is closed to block the inflow of light from the outside.

When power is supplied to the illumination 50 installed in the inspection room 10 to generate light of a constant illuminance, the camera 40 photographs the inspection object to generate an image. At this time, the general plane of the inspection object is brightly reflected by the light, the hole formed in the inspection object is not represented by the light is not reflected, the black color is displayed, the welding spot is slightly dark, and the contrast is different according to the inspection contents.

The image generated by the camera 40 is transmitted to the controller, and the coordinate values of the photographed image of the good quality preset by the controller 60 and the image transmitted from the camera 40 are compared, and it is determined whether the contrast matches. do.

In other words, the positions of 11 holes required for seat cushion are defined by the values of X and Y axes, and the intensity of contrast corresponding to each position in the good-quality shot image is numerically calculated, and the X and Y axes of the corresponding holes in the image transmitted from the camera. The values representing the degree of light and dark at the axial position are compared, and the quantity of the object to be inspected and the quality of the object are judged by the match of the light and dark values.

If the result of the determination in the controller is a good product, the good marking device provided in the guide unit 30 is operated to indicate that the test object is good, and the blue light of the indicator is operated. In addition, the screen of the inspection object photographed by the camera is displayed on the monitor 70 together with information such as inspection date and time, product number, and the like.

If the inspection object is defective as a result of the determination by the control unit, the defect marking device provided in the guide unit 30 is operated to indicate that the inspection object is defective, the red light of the indicator light is activated, and the buzzer is operated to produce the defective product. Inform the occurrence of.

And, as shown in Figure 7a, the image of the defective product photographed by the camera is displayed on the monitor 70 with information such as the inspection date and time, product number, and the defective location.

In addition, as shown in Figure 7b to store the image information and the defective location information of the defective product in the memory, and outputted from the printer 80 provided separately to be considered as the data for examining the cause of the defect.

When the inspection of the automobile parts is completed as described above, the power supply to the electromagnet is cut off, the opening / closing door 11 of the inspection room is opened, and the linear motor of the guide unit is operated to move the jig to the outside of the inspection room. After that, the inspection object is separated from the jig and a new inspection object is settled.

The present invention is not limited to the technical spirit of the specific embodiments or drawings described above, and those skilled in the art without departing from the gist of the invention claimed in the claims Various modifications are possible, of course, and such changes are within the scope of the claims.

 A unique effect according to the configuration of the present invention is that by comparing the image of the inspection target taken by the camera with the image of the preset good inspection target can be inspected automatically whether the defective parts of the car.

Another effect of the present invention is to increase the efficiency of the inspection by photographing the inspection target under uniform illuminance in a closed inspection room so that the inflow of light from the outside is blocked to remove the optical noise.

Another effect of the present invention is that by marking the vehicle parts to be inspected as defective, and marking them on the vehicle parts and outputting the location where the failure occurred, it is possible to correct the cause of the failure to prevent the occurrence of additional defective products have.

Claims (6)

delete delete A vision system that inspects parts by images taken by the camera, which is equipped with a closed inspection room that blocks external light, one or more cameras installed inside the inspection room to photograph parts, and lighting that supplies a light source for shooting. In the automobile parts inspection apparatus using Parts inspected in the inspection room by the image taken by the camera is an automotive part, The jig pin is placed in the lower part of the inspection room to fix the automobile parts, and the jig pins are inserted into the holes of the automobile parts to seat the automobile parts, a product presence sensor for determining whether the parts are seated, and the jig pins mounted on the jig pins. Jig made of an electromagnet for fixing the part; A guide part for moving the jig into the inspection room; A control unit for receiving an image of the automotive part photographed by the camera and comparing the coordinate value of the photographed image with the coordinate value of the image corresponding to a preset good photographing screen of the inspection object; And And a monitor configured to display the photographed image and the related information of the vehicle component in response to an operation signal of the controller. The method of claim 3, wherein Automotive parts inspection apparatus using a vision system, characterized in that each jig is provided according to the vehicle parts to be inspected. The method of claim 3, wherein If it is determined that the car parts are defective by the control unit, the buzzer sounds and activates a red light in the warning lamp to inform the occurrence of the defective goods, and the car parts inspection apparatus using a vision system, characterized in that indicating the defective car parts by means of marking. . The method of claim 5, Auto parts inspection apparatus using a vision system, characterized in that the printer for printing the photographed screen of the defective product is further provided.

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