WO2023201980A1

WO2023201980A1 - Vehicle tailgate lock hole position detection apparatus and vehicle tailgate size measurement device

Info

Publication number: WO2023201980A1
Application number: PCT/CN2022/119694
Authority: WO
Inventors: 姜华贞; 李响
Original assignee: 天津欣象科技有限公司
Priority date: 2022-04-18
Filing date: 2022-09-19
Publication date: 2023-10-26
Also published as: CN217358412U

Abstract

A vehicle tailgate lock hole position detection apparatus and a vehicle tailgate size measurement device. The vehicle tailgate lock hole position detection apparatus comprises a first detection part (1) and a second detection part (2), the first detection part (1) and the second detection part (2) respectively being provided with an industrial camera (3), a machine vision lens (4) and an angled coaxial light source (5), wherein the industrial camera (3) and the machine vision lens are coaxial; the angled coaxial light source (5) is respectively provided with a first window (6) and a second window (7) which are perpendicular to each other; the machine vision lens is perpendicular to the second window (7); and the first windows (6) of the first detection part (1) and the second detection part (2) face the same side of the detection apparatus and are parallel to each other. The vehicle tailgate lock hole position detection apparatus and the vehicle tailgate size measurement device have a high accuracy, do not produce the phenomenon of missed detection, have no loss of mechanical parts, have a high detection speed, occupy a small installation space, have an obvious deployment advantage in a limited space, involve fully-automatic detection, and have abundant internal and external interfaces.

Description

A car tailgate lock hole position detection device and size detection equipment

Technical field

The utility model relates to automobile tail door lock hole position detection, in particular to a car tail door lock hole position detection device and size detection equipment.

Background technique

During the final assembly of the car, after the car tail door keyhole sheet metal parts are fixed to the designated position of the car tail door, certain errors will occur due to the process. As the assembly equipment is used over time, the assembly errors may increase, resulting in A large deviation causes the lock hole to deviate from the correct position, affecting the tailgate locking operation.

Detection of the lock hole position of the car tail door. The car tail door is equipped with 2 round holes and 1 oval hole for car locks. The deviation of the lock hole is allowed to be within ±0.2mm to ensure normal subsequent use. Car tailgates undergo a series of quality inspections before leaving the factory. The position of the keyhole cannot be detected using contact sensors for the time being, and only manual measurement is used.

Currently, manual inspection and mechanical penetration devices are generally used for through-hole inspection on the market. Among them, the accuracy of manual detection is relatively low, and missed detections and wrong detections may occur. Moreover, manual detection is inefficient, labor-intensive, and data statistical analysis is difficult. Mechanical penetration detection devices include cylinders, sensors, connectors, etc. Mechanical penetration detection devices are prone to wear and tear. When the wear and tear reaches a certain level, it will affect the detection results, thereby affecting the improvement of vehicle quality.

At present, the size detection equipment used to detect the size specifications of automobile tailgates is contact or infrared detection sensors. There is no problem with such sensors detecting point surfaces, but they cannot detect through holes.

The installation method of the traditional visual inspection and shooting system is from bottom to top: the object to be measured, the lens, the camera, and additional supporting light sources. The traditional solution not only requires a large enough installation space on one side of the object to be detected, but also requires both the lighting direction and the reflection direction to be straight up and down, with a fixed and single form. In order to detect the positions of three keyholes at the same time, the traditional visual inspection design scheme is to use three sets of shooting systems to shoot one keyhole respectively and output the detection results at the same time.

The size inspection equipment does not reserve space for installing the shooting system, so the industrial camera, lens, detection object, and light source cannot be arranged coaxially in sequence, nor can three sets of shooting systems be installed at the same time. In order to realize the size detection of car tailgates, the size detection equipment utilizes dozens of contact sensors, and there is not enough space to install a traditional shooting system.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies existing in the prior art and provide a vehicle tailgate lock hole position detection device and size detection equipment.

The utility model is realized through the following technical solutions:

A vehicle tailgate keyhole position detection device, including a first detection part and a second detection part. The first detection part and the second detection part are respectively equipped with an industrial camera, a machine vision lens, a corner coaxial light source, an industrial camera and a machine The vision lens is coaxial and the corner coaxial light source is provided with mutually perpendicular windows No. 1 and 2. The machine vision lens is perpendicular to the No. 2 window. The No. 1 windows of the first detection part and the second detection part face the same side of the detection device. And parallel.

According to the above technical solution, preferably, the industrial camera is installed on an angle tilt stage.

According to the above technical solution, preferably, the angle tilt tables of the first detection part and the second detection part are both fixedly connected to brackets.

According to the above technical solution, preferably, a dichroic lens and a light source are provided in the corner coaxial light source. The light emitted by the light source is at an angle of 45 degrees to the dichroic lens. The two parts of the light refracted by the dichroic lens are perpendicular to the No. 1 window and the No. 2 window respectively. .

A car tailgate size detection equipment, which adopts the above-mentioned car tailgate keyhole position detection device and is installed on the car tailgate size detection equipment. The car tailgate size detection equipment is provided with a position trigger, and the position trigger is used to detect the car tailgate. Whether the detection position is reached and the industrial cameras of the first detection part and the second detection part are started, the industrial camera transmits the image to the image processing module, the image processing module outputs the position coordinates of the keyhole and compares it with the standard size and outputs the offset of the center of the keyhole circle quantity.

The beneficial effects of the utility model are: the invention has high accuracy, no missed detection, no loss of mechanical parts, fast detection speed, small installation space occupied, obvious deployment advantages in limited space, fully automatic detection , with rich internal and external interfaces.

Description of the drawings

Figure 1 shows a schematic diagram of an embodiment of the present invention.

Figure 2 shows a schematic structural diagram of an embodiment of the present utility model.

Figure 3 shows a schematic diagram of the keyhole structure of the embodiment of the present invention.

In the picture: 1. The first detection department, 2. The second detection department, 3. Industrial camera, 4. Machine vision lens, 5. Corner coaxial light source, 6. Window No. 1, 7. Window No. 2, 8. Angle Tilt table.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and best embodiments.

As shown in the figure, the utility model provides a vehicle tailgate keyhole position detection device, which includes a first detection part 1 and a second detection part 2. The first detection part is used to photograph and detect two circular keyholes, and the second detection part The part is used for photographing and detecting an oval keyhole. The first detection part and the second detection part are respectively equipped with an industrial camera 3, a machine vision lens 4, and a corner coaxial light source 5. Industrial cameras and machine vision lenses coaxially form a camera module. The corner coaxial light sources are respectively provided with mutually perpendicular No. 1 windows 6 and No. 2 windows 7, and the light emitted by the light sources is illuminated on the 45-degree dichroic lens. Part of the light is refracted and passes through window number one. Another part of the light is refracted and passes through the No. 2 window and hits the machine vision lens. The machine vision lens is perpendicular to window number two. The No. 1 windows of the first detection part and the second detection part face the same side of the detection device and are parallel. In order to break through the limitation of installation space, the existing space can only install 2 sets of shooting systems, so 3 sets are compressed into 2 sets.

Among them, the industrial camera is installed on the angle tilt table 8, and the angle tilt tables of the first detection part and the second detection part are both fixedly connected to the brackets. Since there is a certain angle between the keyhole surface and the ground plane when the car tailgate is in the standard detection position of the size detection equipment, the present invention installs an angle tilting table under the camera module. The angle of the camera module can be adjusted by rotation to achieve locking. The fit between the hole surface and the camera module.

When the car tailgate moves to the detection position, the industrial cameras of the first detection part and the second detection part start to take pictures. Among them, the industrial camera in the first inspection department is a 12-megapixel black and white camera, which is used to photograph and inspect two circular keyholes. The industrial camera in the second inspection department is a 6-megapixel black and white camera, which is used to photograph and inspect an oval keyhole.

Keyhole detection requires detecting the positions of three holes at the same time. Taking the center chassis of the car's front as the origin, a coordinate system is established facing the rear of the car. Pointing to the sky is the positive z-axis, pointing to the rear of the car is the positive x-axis, and pointing to the co-pilot is the y-axis. Positive direction. This system supports simultaneous detection of x-axis and y-axis.

This invention is used together with size detection equipment and does not require additional training for workers to operate. Through the IO port signal interaction technology, when the car tailgate reaches the detection zero position, the camera of this system automatically starts to work. The pictures taken by the camera will go through a series of processing operations and then sent to the inference module. The inference module gives the image coordinate system positions of the three center points, which will be sent to the result integration processing module; in this module, a three-dimensional coordinate system conversion will be performed to convert the image coordinate system position into the position of the car model coordinate system. Thus, the offset of the center of the keyhole circle is obtained by comparing with the standard data, and the offset is uploaded to the factory MES system. The entire identification process is fully automated with no manual participation.

The beneficial effects of the utility model are: it adopts simultaneous detection with the size detection equipment, and the shooting system is installed on the size detection equipment, which can control the cost without adding additional manual operation stations and without prolonging the overall quality inspection time. This solution does not require the addition of a separate station for detecting car tailgate lock holes, nor the need for additional employees to operate the equipment. It achieves high-precision key hole detection while reducing cost control time.

The invention adopts a space-saving, easy-to-use, flexible corner coaxial light source to realize a 90-degree angle change of the light path, and enables the installation of a camera module on the size detection equipment to detect the position of the keyhole. The industrial camera is connected to the machine vision lens and transferred to the coaxial light source to rotate the light path 90°. Two sets of shooting systems realize simultaneous detection.

The invention has high accuracy, no missed detection, no loss of mechanical parts, fast detection speed, small installation space, obvious advantages of deployment in a limited space, fully automatic detection, and rich internal and external interfaces .

The above are only the preferred embodiments of the present invention. It should be pointed out that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention. These improvements and Retouching should also be considered as the protection scope of this utility model.

Claims

A vehicle tailgate keyhole position detection device, which is characterized by: including a first detection part and a second detection part. The first detection part and the second detection part are respectively equipped with an industrial camera, a machine vision lens, and a corner coaxial light source. The industrial camera and the machine vision lens are coaxial, and the corner coaxial light sources are respectively provided with mutually perpendicular windows No. 1 and 2. The machine vision lens is perpendicular to the No. 2 window, and the No. 1 windows of the first detection part and the second detection part face The detection devices are on the same side and parallel.
A vehicle tailgate keyhole position detection device according to claim 1, characterized in that: the industrial camera is installed on an angle tilting table.
A vehicle tailgate keyhole position detection device according to claim 2, characterized in that the angle tilt tables of the first detection part and the second detection part are both fixedly connected to brackets.
A vehicle tailgate keyhole position detection device according to claim 2, characterized in that: a dichroic lens and a light source are provided in the corner coaxial light source, the light emitted by the light source forms an angle of 45 degrees with the dichroic lens, and the dichroic lens refracts The two parts of light are perpendicular to window No. 1 and window No. 2 respectively.
A car tail door size detection device, which adopts a car tail door keyhole position detection device according to any one of claims 1 to 4 and is installed on the car tail door size detection device, characterized in that: the car tail door size The detection equipment is equipped with a position trigger. The position trigger is used to detect whether the car tail door reaches the detection position and start the industrial cameras of the first detection part and the second detection part. The industrial camera transmits the image to the image processing module, and the image processing module outputs the lock The position coordinates of the hole are compared with the standard size to output the offset of the center of the keyhole circle.