CN203163699U - Automobile drum brake friction plate detection system - Google Patents

Abstract

The utility model provides an automobile drum brake friction plate detection system, which belongs to the field of automatic control detection. The system is composed of a CCD camera, an image collector, a computer, a data acquisition card and four displacement sensors. The CCD camera is connected with the image acquisition card. , the displacement sensor is connected with the data collector, and the image acquisition card and the data acquisition card are connected with the computer. The displacement sensor on the same side and the displacement sensor on different sides obtain the vertical height and chord length information of the friction plate respectively, and send it to the computer through the data acquisition card, and the video image is obtained by the CCD camera, processed by the image collector, and the arc length information of the friction plate is obtained and sent to the computer. into the computer, using the ratio between the actual measured value of the chord length and the pixel occupied by the image display chord length, to obtain the actual arc length value corresponding to the pixel occupied by the arc length of the friction plate in the image, and the obtained diameter and arc length of the friction plate , The vertical height information is compared with the standard diameter, arc length, and vertical height information, and a real-time alarm is generated.

Description

An automobile drum brake friction plate detection system

technical field

The utility model provides an automobile drum brake friction plate detection system, which belongs to the field of automatic control detection.

Background technique

The brake is a safety component on the car. The diameter and vertical height of the friction pad of the automobile drum brake are two important indicators. However, there is no suitable and effective method for the detection of drum brake friction pads. The traditional method uses manual measurement and detection, but the effect is not very good. Here, a detection system for automobile drum brake friction pads is proposed, which can effectively detect automobile drum brake friction pads. The diameter and vertical height of the drum brake friction plate are detected, and the arc length of the automobile drum brake friction plate can be calculated at the same time, which has good practicability.

Contents of the invention

In view of the above, the main purpose of this utility model is to provide an automobile drum brake friction lining detection system, which can detect the automobile drum brake friction lining in real time, and accurately measure the diameter, verticality and arc length information of the friction lining. Has a strong practicality.

In order to achieve the above object, the technical solution adopted by the utility model is: the system is composed of a CCD camera, an image acquisition device, a computer, a data acquisition card, and four displacement sensors, wherein the CCD camera is connected with the image acquisition device, and the four displacement sensors It is connected with the data acquisition card, and the image collector and the data acquisition card are respectively connected with the computer. The CCD camera is vertically placed on the middle square of the production line of the automobile drum brake friction plate, keeping the chord height of the automobile drum brake friction plate parallel to the production line, and respectively placed on both sides of the production line perpendicular to the chord length of the automobile drum brake friction plate Two displacement sensors, and keep the two displacement sensors on the same side and the two displacement sensors on the other side just equal to the vertical height of the standard automobile drum brake friction plate. Combining the image collector and data acquisition card with the computer to compare the actual measured arc length, diameter and vertical height information of the automobile drum brake friction plate with the arc length, diameter and vertical height information of the standard automobile drum brake friction plate, if Within the allowable error range, no alarm will be generated, and if it exceeds the error range, an alarm will be issued.

The utility model collects data on the automobile drum brake friction plate through an image collector and a data acquisition card, calculates the arc length, vertical height and diameter of the collected automobile drum brake friction plate through a computer, and compares it with the standard data. Accurate measurement values are obtained within the allowable range of error, and the practicability is strong.

Description of drawings

Fig. 1 is the system schematic diagram of the utility model. The system consists of CCD camera (1), image acquisition device (2), computer (3), data acquisition card (4), displacement sensor (5), displacement sensor (6), displacement sensor (7), displacement sensor (8 )composition.

Fig. 2 is a flow chart of obtaining the chord length of the utility model. It is mainly composed of displacement sensor (5), displacement sensor (6), displacement sensor (7), displacement sensor (8), calculating the upper side chord length of the automobile drum brake friction plate (9), and calculating the lower side chord length of the automobile drum brake friction plate length (10), data acquisition card (4), two chord lengths are compared and calculate the average value (11), and the average value is formed as the chord length (12) of the automobile drum brake friction plate.

Fig. 3 is a work flow diagram of the utility model. It is mainly composed of CCD camera (1), image collector (2), data acquisition card (4), displacement sensor (5), displacement sensor (6), displacement sensor (7), displacement sensor (8), and obtains the car drum type The vertical height of one side of the brake friction plate (13), obtain the vertical height of the other side of the automobile drum brake friction plate (14), compare the average value of both sides and calculate the average value (15), and use the average value as the friction value of the automobile drum brake The vertical height of the disc (16), obtaining the arc length and shape characteristics of the friction disc of the automobile drum brake (17), calculating the pixels occupied by the chord length of the friction disc of the drum brake of the automobile (18), and the measured value of the chord length of the friction disc of the drum brake of the automobile (19), calculate the two corresponding ratios (20), calculate the arc length of the automobile drum friction plate, the diameter (21), the computer output result (22), and report to the police (23) to form.

Detailed ways

Below in conjunction with accompanying drawing, the utility model invention is further described.

Fig. 2 is the acquisition flow chart of chord length in the utility model, and displacement sensor generally adopts infrared laser displacement sensor, as shown in Fig. 2, its specific steps are as follows:

Step 1 utilizes the displacement sensor (5) and the displacement sensor (7) to calculate the chord length (9) on the upper side of the friction plate of the automobile drum brake;

Step 2 utilizes the displacement sensor (6) and the displacement sensor (8) to calculate the chord length (10) of the lower side of the friction plate of the automobile drum brake;

Step 3 sends the chord length information obtained in the above two steps to the data acquisition card (4) for processing, and compares the two chord lengths and calculates the average value (11). If the difference between the two chord lengths is relatively large, it is considered that the detected car drum If the disc brake friction plate is defective, if the information on the two chord lengths has little difference, calculate the average value and use the average value as the chord length of the drum brake friction plate (12);

Fig. 3 is a system work flowchart of the present utility model, as shown in Fig. 3, its concrete steps are as follows:

Step 1 Use the displacement sensor (5) and the displacement sensor (6) to calculate the vertical height (13) of one side of the friction plate of the automobile drum brake, and use the displacement sensor (7) and the displacement sensor (8) to calculate the vertical height (13) of the friction plate of the automobile drum brake on the other side For the vertical height on one side (14), send the vertical height information obtained twice to the data acquisition card (4), compare the vertical heights on both sides and calculate the average value (15), if the vertical height difference between the two sides is relatively large , then it is considered that the automobile drum brake friction lining detected is defective, if the error is too small, then the average value is used as the vertical height (16) of the automobile drum brake friction disk;

Step 2 Send the video image collected by the CCD camera (1) to the image collector (2) for real-time processing, and use image binarization, mathematical morphology calculation, etc. to obtain the arc length shape feature of the friction plate of the automobile drum brake (17) , and calculate the pixels (18) occupied by the chord length of the automobile drum brake friction plate, the actual measurement value (19) of the chord length of the automobile drum brake friction plate can be obtained by using the flowchart in Figure 2, and the chord length of the automobile drum brake friction plate The occupied pixels are compared with the measured value of the chord length of the friction plate of the automobile drum brake, and the corresponding ratio (20) of the two is calculated, and the number of pixels occupied by the arc length shape feature (17) of the friction plate of the automobile drum brake is calculated, Using the corresponding ratio and the number of pixels occupied by the arc length, the actual arc length and radius can be obtained, that is, the arc length and diameter (21) of the automobile drum brake friction plate can be calculated.

Step 3 outputs the operation results of step 1 and step 2 through the computer, that is, the computer output result (22), if the arc length, diameter and vertical height information of the automobile drum brake friction plate in the output result are the same as the standard automobile drum brake friction plate If the information is within the allowable error range, then it is considered that the friction lining of the automobile drum brake is qualified, otherwise it is considered that the product is not suitable, and an alarm is issued (23).

Claims (2)

1. A kind of automobile drum brake friction plate detection system, its structural feature is: this system is made of CCD camera (1), image acquisition device (2), computer (3), data acquisition card (4), displacement transducer (5 ), displacement sensor (6), displacement sensor (7), displacement sensor (8), wherein CCD camera (1) is connected with image acquisition device (2), displacement sensor (5), displacement sensor (6), displacement sensor (7), the displacement sensor (8) is connected with the data acquisition card (4), and the image acquisition card (2), the data acquisition card (4) is connected with the computer (6) respectively. 2. According to claim 1, the described a kind of automobile drum brake friction lining detection system is characterized in that: the CCD camera (1) is placed vertically on the position in the middle of the automobile drum brake friction lining production line, keeping the automobile drum brake The chord height of the brake friction plate is parallel to the production line, and two displacement sensors are respectively placed on both sides of the production line perpendicular to the chord length of the automobile drum brake friction plate, and the displacement sensor (5) and the displacement sensor (6) are kept on the same side. ), the displacement sensor (7) on the other side, and the displacement sensor (8) are just on par with the vertical height of the standard automobile drum brake friction plate, and the computer (3) is utilized in conjunction with the image acquisition device (2) and the data acquisition card (4) Compare the arc length, diameter and vertical height information of the actual measured automobile drum brake friction plate with the arc length, diameter and vertical height information of the standard automobile drum brake friction plate. If it is within the allowable error range, no Alarm, if the error range is exceeded, an alarm will be issued.

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