An automatic triggering device and method for strip detection industrial cameras

Abstract

The application discloses an automatic triggering device and method for a strip detection industrial camera, and belongs to the field of industrial camera triggering technology.The device comprises a first photoelectric tube, which is arranged at a position corresponding to a to-be-detected position of a strip steel, and is used for triggering an industrial camera and a light source to start photographing a head of the strip steel; a second photoelectric tube, which is arranged at a position behind the to-be-detected position along a running direction of the strip steel, and is used for triggering the industrial camera and the light source to stop working; and a third photoelectric tube, which is arranged at a position in front of the to-be-detected position, and is used for triggering the industrial camera and the light source to start photographing a tail of the strip steel; and a multifunctional IO card, which is used for transmitting level signals of the first photoelectric tube, the second photoelectric tube and the third photoelectric tube to a server, and issuing an acquisition or stop working instruction of the industrial camera and the light source by the server.The application realizes automatic triggering of the industrial camera, guarantees the accuracy of the detection length, and prolongs the service life of the industrial camera and the light source.

Description

Technical Field

[0001] This invention relates to visual inspection technology for strip steel surfaces, and more specifically, to an automatic triggering device and method for an industrial camera for strip inspection. Background Technology

[0002] When hot-rolling certain specific grades, prominent quality problems include strip misalignment at the head and tail and unilateral waviness defects, which affect the stability of subsequent welding and rolling processes, causing abnormal shutdowns. Factors that produce and affect the shape of hot-rolled strip include: the thickness and width of the slab itself, the slab temperature, and the levelness of the rolls, etc. These often manifest as edge waviness and sickle bends.

[0003] Currently, some hot rolling production lines are equipped with flatness gauges at the exit, which can be used to detect the flatness of strip exiting the finishing mill stand based on temperature and stress curves. However, due to the unstable operation of the strip head and tail stands, exhibiting varying degrees of "floating" and "upward drifting," and the significant changes in strip shape after passing through the laminar flow cooling zone compared to high-temperature conditions, the flatness gauges suffer from low accuracy and cannot effectively identify "abnormal strip shapes" that affect subsequent production processes. Currently, hot rolling mills experience numerous downstream quality problems caused by edge waviness.

[0004] Currently, edge waviness detection of strip steel mostly employs machine vision inspection methods that combine laser structured light and area scan cameras. In actual production, strip edge waviness typically occurs within a 100-meter range at both ends. To improve system efficiency and reduce the lifespan of components such as camera light sources, image acquisition is only required for approximately 100 meters of the strip's length at both ends.

[0005] Among existing patent applications, patent CN103237174A describes a triggering method for a linear scan industrial camera with filtering function based on an ISA bus. This method addresses the problems of existing triggering methods that cannot trigger the camera every 25µm movement and cannot guarantee that the mechanical beam will only trigger the camera when it moves to the target position in one direction, failing to trigger it when moving in the opposite direction. Patent CN204272273U describes a trigger for a linear scan camera implemented using pulses.

[0006] The aforementioned patent application text still fails to resolve the triggering problem associated with the camera. Summary of the Invention

[0007] In view of the above-mentioned defects in the prior art, the purpose of this invention is to provide an automatic triggering device and method for an industrial camera for strip inspection, which realizes automatic triggering of the industrial camera, ensures the accuracy of the inspection length, and improves the working life of the industrial camera and the light source.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] On one hand, an automatic triggering device for an industrial camera for strip inspection includes:

[0010] The first photoelectric pair is set at the corresponding test position of the strip to trigger the industrial camera and light source to take a picture of the head of the strip.

[0011] The second photoelectric pair is located at the downstream position of the position to be measured along the running direction of the strip steel, in order to trigger the industrial camera and the light source to stop working;

[0012] The third photoelectric pair is located in the upstream position of the position to be measured, and is used to trigger the industrial camera and the light source to take pictures of the tail end of the strip.

[0013] A multi-functional I / O card is used to transmit the level signals of the first phototransistor, the second phototransistor, and the third phototransistor to the server, so that the server can issue commands to the industrial camera and the light source to collect or stop working.

[0014] Preferably, the second photoelectric pair is located 100 to 200 meters away from the location to be measured.

[0015] Preferably, the third photoelectric pair is located 100 to 200 meters away from the location to be measured.

[0016] Preferably, the multi-function I / O card establishes a communication connection with the server via Ethernet.

[0017] On the other hand, an automatic triggering method for a strip inspection industrial camera is provided. Using the automatic triggering device of the strip inspection industrial camera, when the head of the strip reaches the position to be tested, the level signal output by the first photoelectric pair changes from 1 to 0. The falling edge signal of this level is captured by the multi-functional IO card and transmitted to the server via Ethernet. The server issues a command to control the industrial camera and the light source to start taking pictures of the head of the strip.

[0018] After the head of the strip leaves the position to be measured, it reaches the position of the second photoelectric pair. The level signal output by the second photoelectric pair changes from 0 to 1. The rising edge signal of this level is captured by the multi-function IO card and transmitted to the server via Ethernet. The server issues a command to control the industrial camera and the light source to stop working.

[0019] When the tail of the strip reaches the position of the third photoelectric pair, the level signal output by the third photoelectric pair changes from 0 to 1. The rising edge signal of this level is captured by the multi-functional IO card and transmitted to the server via Ethernet. The server issues a command to control the industrial camera and the light source to restart taking pictures of the tail of the strip until the tail of the strip leaves the position to be tested, and the detection process ends.

[0020] The present invention provides an automatic triggering device and method for an industrial camera used for strip inspection. In field use, this invention overcomes various influencing factors such as harsh environments and numerous interferences, ensuring the inspection equipment operates normally 24 / 7. This invention utilizes a simple and robust triggering logic composed of three pairs of photoelectric sensors to automatically trigger the industrial camera and light source, ensuring the accuracy of strip length detection and extending the service life of the industrial camera and light source. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the frame of the automatic triggering device of the present invention;

[0022] Figure 2 This is a flowchart illustrating the automatic triggering method of the present invention. Detailed Implementation

[0023] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Combination Figure 1 As shown, the automatic triggering device for an industrial camera for strip inspection provided by the present invention includes:

[0025] The first photoelectric pair 1 is installed at the test position 200 of the corresponding strip 100. When the head of the strip 100 reaches the test position 200, it is responsible for triggering the industrial camera 300 and the light source to start taking pictures of the head of the strip 100.

[0026] The second photoelectric pair 2 is installed at the downstream position of the position to be measured 200 along the running direction of the strip 100, and is responsible for triggering the industrial camera 300 and the light source to stop working.

[0027] The third photoelectric pair 3 is installed in the front position of the position to be tested 200, and is responsible for triggering the industrial camera 300 and the light source to start taking pictures of the tail of the strip steel 100.

[0028] When the multi-functional IO card 4 detects the arrival of the strip 100 to be tested, it transmits the level signals output by the first photoelectric pair 1, the second photoelectric pair 2, and the third photoelectric pair 3 to the server 5, which then issues commands to the industrial camera and light source to collect data or stop operation.

[0029] The second photoelectric pair 2 is installed 100 meters away from the location to be measured, which is 200 meters away from the location to be measured.

[0030] The third photoelectric pair 3 is installed 100 meters away from the location to be measured, which is 200 meters away from the location to be measured.

[0031] The multi-function IO card 4 establishes a communication connection with the server 5 via Ethernet.

[0032] Combination Figure 2 As shown, the present invention also provides an automatic triggering method for an industrial camera for strip inspection. Using the automatic triggering device of the industrial camera for strip inspection of the present invention, when the head of the strip 100 reaches the position to be inspected 200, the level signal output by the first photoelectric pair 1 changes from 1 to 0. The falling edge signal of this level is captured by the multi-function IO card 4 and transmitted to the server 5 via Ethernet. The server 5 issues a command to control the industrial camera 300 and the light source to start taking pictures of the head of the strip 100.

[0033] After the head of the strip 100 leaves the position to be measured 200, it reaches the position of the second photoelectric pair 2. The level signal output by the second photoelectric pair 2 changes from 0 to 1. This rising edge signal is captured by the multi-function IO card 4 and transmitted to the server 5 via Ethernet. The server 5 issues a command to control the industrial camera 300 and the light source to stop working.

[0034] When the tail of the strip 100 reaches the position of the third photoelectric pair 3, the level signal output by the third photoelectric pair 3 changes from 0 to 1. This rising edge signal is captured by the multi-function IO card 4 and transmitted to the server 5 via Ethernet. The server 5 issues a command to control the industrial camera 300 and the light source to restart and start taking pictures of the tail of the strip 100 until the tail of the strip 100 leaves the test position 200, and the entire detection process ends.

[0035] The automatic triggering device and method for strip inspection industrial cameras of the present invention uses three pairs of photoelectric pairs (first photoelectric pair 1, second photoelectric pair 2 and third photoelectric pair 3) to form a simple and rigorous triggering logic, realize automatic triggering of industrial cameras, ensure the accuracy of detection length, improve the working life of cameras and light sources, and have great economic and social benefits.

[0036] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. An automatic triggering method for an industrial strip inspection camera using an automatic triggering device, characterized in that, The automatic triggering device of the strip inspection industrial camera includes: The first photoelectric pair is set at the corresponding test position of the strip to trigger the industrial camera and light source to take a picture of the head of the strip. The second photoelectric pair is located at the downstream position of the position to be measured along the running direction of the strip steel, in order to trigger the industrial camera and the light source to stop working; The third photoelectric pair is located in the upstream position of the position to be measured, and is used to trigger the industrial camera and the light source to take pictures of the tail end of the strip. A multi-functional I / O card is used to transmit the level signals of the first phototransistor, the second phototransistor, and the third phototransistor to the server, which then issues commands to the industrial camera and the light source to acquire or stop operating the signal. The automatic triggering method of the strip inspection industrial camera is as follows: when the head of the strip reaches the position to be tested, the level signal output by the first photoelectric pair changes from 1 to 0. The falling edge signal of the level is captured by the multi-functional IO card and transmitted to the server via Ethernet. The server issues a command to control the industrial camera and the light source to start taking pictures of the head of the strip. After the head of the strip leaves the position to be measured, it reaches the position of the second photoelectric pair. The level signal output by the second photoelectric pair changes from 0 to 1. The rising edge signal of this level is captured by the multi-function IO card and transmitted to the server via Ethernet. The server issues a command to control the industrial camera and the light source to stop working. When the tail of the strip reaches the position of the third photoelectric pair, the level signal output by the third photoelectric pair changes from 0 to 1. The rising edge signal of this level is captured by the multi-functional IO card and transmitted to the server via Ethernet. The server issues a command to control the industrial camera and the light source to restart taking pictures of the tail of the strip until the tail of the strip leaves the position to be tested, and the detection process ends.

2. The automatic triggering method for an industrial camera for strip inspection according to claim 1, characterized in that: The second photoelectric pair is located 100 to 200 meters away from the location to be measured.

3. The automatic triggering method for an industrial camera for strip inspection according to claim 1, characterized in that: The third photoelectric pair is located 100 to 200 meters away from the location to be measured.

4. The automatic triggering method for an industrial camera for strip inspection according to claim 1, characterized in that: The multi-functional I / O card establishes a communication connection with the server via Ethernet.

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