Rim air tightness detection system and detection method thereof

Abstract

The invention relates to the technical field of rim airtightness detection, in particular to a rim airtightness detection system, which comprises an ultrasonic sensor group, a signal processing module and a data processing module, the ultrasonic sensor group is arranged on the outer circumference of the rim in an array mode, detects and collects ultrasonic signals generated during gas leakage of the rim in an omnibearing mode, and the ultrasonic sensor group transmits the ultrasonic signals to the signal processing module; the signal processing module is used for receiving the ultrasonic signals, sequentially amplifying and filtering the ultrasonic signals and then transmitting the ultrasonic signals to the data processing module; and the data processing module analyzes and processes the filtered ultrasonic signal, judges whether leakage occurs or not, determines the leakage position, and finally outputs a judgment result. The method has the advantage that whether air leakage occurs or not can be quickly judged by detecting the noise generated by the leakage point. The detection time can be shortened to 1 / 10 or even one tenth, and the precision is higher and more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of wheel rim air tightness detection, and in particular to a wheel rim air tightness detection system and a detection method thereof. Background Art

[0002] During the production of wheel rims, the plates need to go through welding and forming processes. During the welding process, residual cracks, sand holes, welds, etc. may be generated, or tiny cracks in the welds may be caused during the later extrusion forming process, which will lead to unqualified wheel rim seals. Especially during the production process, some tiny cracks cannot be quickly and accurately identified by operators, resulting in the outflow of unqualified products, affecting product quality and causing greater economic losses. Summary of the invention

[0003] In view of this, the present invention aims to provide a rim air tightness detection system and a detection method thereof, which detects the air tightness of the rim through an ultrasonic sensor group.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows: A wheel rim air tightness detection system comprises: an ultrasonic sensor group, a signal processing module and a data processing module; the ultrasonic sensor group array is arranged on the outer circumference of the wheel rim to detect and collect ultrasonic signals generated when the wheel rim leaks gas in all directions; the ultrasonic sensor group inputs the ultrasonic signal to the signal processing module; the signal processing module is used to receive the ultrasonic signal, amplify and filter the ultrasonic signal in turn, and then input the filtered ultrasonic signal to the data processing module; the data processing module analyzes and processes the filtered ultrasonic signal, and determines whether the wheel rim leaks, as well as the leakage position of the wheel rim, and finally outputs the judgment result.

[0005] Furthermore, the signal processing module includes an amplifier, a noise filter and a feedback module; wherein the amplifier is used to receive the ultrasonic signal input by the ultrasonic sensor group, amplify the ultrasonic signal, and then input the amplified ultrasonic signal into the noise filter; the noise filter performs noise reduction processing on the amplified ultrasonic signal, and inputs the noise-reduced ultrasonic signal into the data processing module; the data processing module analyzes and processes the filtered ultrasonic signal, and determines whether the rim is leaking, and determines the leakage position of the rim, and finally outputs the judgment result; the feedback module receives information from the noise filter, and adjusts the gain of the amplifier or the parameters of the noise filter according to the information of the noise filter, so as to optimize the processing effect of the ultrasonic signal.

[0006] Furthermore, the data processing module includes a microprocessor, which periodically controls data acquisition, processes environmental noise, optimizes signal quality, completes final calculations when conditions are met, and finally outputs the processed signal.

[0007] Furthermore, the gain range of the amplifier is 1 to 1000, and the noise figure is less than 1.4.

[0008] Furthermore, the filtering frequency of the noise filter is 32kHz~41.2kHz.

[0009] Furthermore, the frequency of each ultrasonic sensor in the ultrasonic sensor group is 38Khz.

[0010] A rim air tightness detection method is implemented using the above-mentioned rim air tightness detection system, comprising the following steps: S1. Start the wheel rim air tightness detection system, and use the ultrasonic sensor group to collect the current environmental noise.

[0011] S2. The data processing module determines whether it is the beginning of a new detection cycle; if so, execute step S3; if not, execute step S4.

[0012] S3. The data processing module further determines whether it is the first detection in the current detection cycle; if not, directly execute step S4; if so, record and calibrate the environmental noise collected by the ultrasonic sensor group.

[0013] S4. After calibrating the environmental noise, the ultrasonic sensor group collects the ultrasonic signal of the rim according to a preset sampling number.

[0014] S5. The data processing module monitors whether the ultrasonic sensor group completes the ultrasonic signal collection of the rim according to the preset sampling times; if not, it continues to collect; if completed, it performs signal processing and analysis, and determines whether the rim is qualified or unqualified.

[0015] Furthermore, the specific determination method of step S5 is as follows: the data processing module compares the sampling value of each ultrasonic sensor with the set threshold value; when the sampling value of the rim ultrasonic signal is less than the set threshold value, it is determined to be qualified; if the sampling value of the rim ultrasonic signal is greater than the threshold value, the value is recorded, and the number of unqualified times of the corresponding ultrasonic sensor is counted; for each ultrasonic sensor, if the cumulative number of unqualified times exceeds the preset threshold number of times, it is determined to be unqualified; conversely, if the number of unqualified times of all ultrasonic sensors does not exceed the preset threshold number of times, it is determined to be qualified.

[0016] Furthermore, the threshold number of unqualified times is 3 times.

[0017] Compared with the prior art, the invention can achieve the following beneficial effects: by detecting the noise generated by the leak point, it is possible to quickly determine whether there is a leak. The detection time can be reduced to 1 / 10 or even several tenths, with higher precision and greater accuracy. The work cycle is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings: Figure 1 is a schematic structural diagram of a wheel rim air tightness detection system provided in an embodiment of the present invention; Figure 2 is a flow chart of a wheel rim air tightness detection method provided in an embodiment of the present invention; Figure 3 It is a specific flow chart of the wheel rim air tightness detection method provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the invention more clear, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the invention and do not constitute a limitation of the invention.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] like Figure 1 As shown, a wheel rim air tightness detection system provided by an embodiment of the present invention includes: an ultrasonic sensor group, a signal processing module and a data processing module; the ultrasonic sensor group array is arranged on the outer circumference of the wheel rim to detect and collect ultrasonic signals generated when the rim leaks gas in all directions; the ultrasonic sensor group inputs the ultrasonic signal to the signal processing module; the signal processing module is used to receive the ultrasonic signal, and amplify and filter the ultrasonic signal in turn, and then input the filtered ultrasonic signal to the data processing module; the data processing module analyzes and processes the filtered ultrasonic signal, and determines whether the rim is leaking, and determines the leakage position of the rim, and finally outputs the judgment result.

[0025] In this embodiment, the hydraulic station drives the hydraulic device to complete the compression and sealing of the rim cavity. After the sealing is completed, the rim cavity is inflated, and the inflation pressure can reach up to 0.6MPa. The ultrasonic sensor group performs detection, and the signal processing module amplifies and filters the collected ultrasonic signal, and the data processing module completes the final calculation, and finally outputs the judgment result.

[0026] Furthermore, the signal processing module includes an amplifier, a noise filter and a feedback module. The amplifier is used to receive the ultrasonic signal converted by the ultrasonic sensor group, and input the amplified ultrasonic signal to the noise filter. The noise filter performs noise reduction on the amplified ultrasonic signal and inputs the noise-reduced ultrasonic signal to the data processing module. The data processing module analyzes and processes the filtered ultrasonic signal, determines whether there is a leak and determines the leak location, and finally outputs the judgment result. The feedback module receives information from the noise filter and dynamically adjusts the gain of the amplifier or the parameters of the noise filter based on this information to optimize the signal processing effect.

[0027] In this embodiment, the ultrasonic sensor uses the US80KS-01 omnidirectional ultrasonic receiving sensor produced by the American Precision Corporation. After the ultrasonic sensor collects the ultrasonic signal, it is amplified by the amplifier, and then the noise component in the signal is reduced or eliminated by the noise filter to improve the signal quality.

[0028] The data processing module includes a microprocessor, which periodically controls data acquisition, processes environmental noise, optimizes signal quality, completes final calculations when conditions are met, and transmits the processed signal to the user interface.

[0029] Furthermore, the gain range of the amplifier is 1 to 1000, and the noise figure is less than 1.4.

[0030] Furthermore, the filtering frequency of the noise filter is 32kHz~41.2kHz.

[0031] Furthermore, the frequency of each ultrasonic sensor in the ultrasonic sensor group is 38Khz.

[0032] A rim air tightness detection method is implemented using the above-mentioned rim air tightness detection system, comprising the following steps: S1. Start the wheel rim air tightness detection system, and use the ultrasonic sensor group to collect the current environmental noise.

[0033] S2. The data processing module determines whether it is the beginning of a new detection cycle; if so, execute step S3; if not, execute step S4.

[0034] S3. The data processing module further determines whether it is the first detection in the current detection cycle; if not, directly execute step S4; if so, record and calibrate the environmental noise collected by the ultrasonic sensor group.

[0035] S4. The ultrasonic sensor group collects the ultrasonic signal of the wheel rim according to a preset sampling number.

[0036] S5. The data processing module monitors whether the ultrasonic sensor group completes the ultrasonic signal collection of the rim according to the preset sampling times; if not, it continues to collect; if completed, it performs signal processing and analysis, and determines whether the rim is qualified or unqualified.

[0037] Furthermore, the specific judgment method of step S5 is: the data processing module compares the sampling value of each ultrasonic sensor with the set threshold value, and when the sampling value of the rim ultrasonic signal is less than the set threshold value, it is judged to be qualified; if the sampling value of the rim ultrasonic signal is greater than the threshold value, the value is recorded, and the number of unqualified times of the corresponding ultrasonic sensor is counted; for each ultrasonic sensor, if the cumulative number of unqualified times exceeds the preset threshold number of times, it is judged to be unqualified; conversely, if the number of unqualified times of all ultrasonic sensors does not exceed the preset threshold number of times, it is judged to be qualified.

[0038] Furthermore, the threshold number of unqualified times is 3 times.

[0039] In this embodiment, we set the threshold of the number of unqualified times to 3 times, and each ultrasonic sensor will collect data 20 times. If the number of times that the ultrasonic sensor sampling value is greater than the threshold is less than 3 times in the data collected by one of the ultrasonic sensors, it is judged that this is due to accidental interference caused by external factors (such as burrs). On the contrary, if the number of times that the ultrasonic sensor sampling value is greater than the threshold is greater than or equal to 3 times in the data collected by one of the ultrasonic sensors, it is judged that there is a leak at the location detected by the ultrasonic sensor.

[0040] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wheel rim air tightness detection system, characterized in that: include: Ultrasonic sensor group, signal processing module and data processing module; The ultrasonic sensor group array is arranged on the outer circumference of the rim to omnidirectionally detect and collect ultrasonic signals generated when gas leaks from the rim; the ultrasonic sensor group inputs the ultrasonic signals to the signal processing module; The signal processing module is used to receive the ultrasonic signal, amplify and filter the ultrasonic signal in sequence, and then input the filtered ultrasonic signal into the data processing module; The data processing module analyzes and processes the filtered ultrasonic signal, determines whether the rim is leaking, and determines the leakage position of the rim, and finally outputs the judgment result.

2. The wheel rim air tightness detection system according to claim 1, characterized in that: The signal processing module includes an amplifier, a noise filter and a feedback module; wherein, The amplifier is used to receive the ultrasonic signal input by the ultrasonic sensor group, amplify the ultrasonic signal, and then input the amplified ultrasonic signal into the noise filter; The noise filter performs noise reduction processing on the amplified ultrasonic signal, and inputs the noise-reduced ultrasonic signal into the data processing module; The data processing module analyzes and processes the filtered ultrasonic signal, determines whether the rim is leaking, determines the leakage position of the rim, and finally outputs the judgment result; The feedback module receives information from the noise filter and adjusts the gain of the amplifier or the parameters of the noise filter according to the information of the noise filter to optimize the processing effect of the ultrasonic signal.

3. The wheel rim air tightness detection system according to claim 2, characterized in that: The data processing module includes a microprocessor, which periodically controls data acquisition, processes environmental noise, optimizes signal quality, completes final calculations when conditions are met, and finally outputs the processed signal.

4. The wheel rim air tightness detection system according to claim 2, characterized in that: The gain range of the amplifier is 1-1000, and the noise coefficient is less than 1.

4.

5. The wheel rim air tightness detection system according to claim 2, characterized in that: The filtering frequency of the noise filter is 32kHz~41.2kHz.

6. The wheel rim air tightness detection system according to claim 1, characterized in that: The frequency of each ultrasonic sensor in the ultrasonic sensor group is 38Khz.

7. A rim air tightness detection method, implemented by using the rim air tightness detection system according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Start the rim air tightness detection system, and collect the current environmental noise by the ultrasonic sensor group; S2. The data processing module determines whether it is the beginning of a new detection cycle; if so, executing step S3; if otherwise, executing step S4; S3. The data processing module further determines whether it is the first detection in the current detection cycle; if not, directly execute step S4; if so, record and calibrate the environmental noise collected by the ultrasonic sensor group; S4. The ultrasonic sensor group collects the ultrasonic signal of the rim according to a preset sampling number; S5. The data processing module monitors whether the ultrasonic sensor group completes the ultrasonic signal collection of the rim according to the preset sampling times; if not, continues to collect; if completed, performs signal processing and analysis, and determines whether the rim is qualified or unqualified.

8. The wheel rim air tightness detection method according to claim 7, characterized in that: The specific judgment method of step S5 is: the data processing module compares the sampling value of each ultrasonic sensor with the set threshold value, and when the sampling value of the rim ultrasonic signal is less than the set threshold value, it is judged to be qualified; if the sampling value of the rim ultrasonic signal is greater than the threshold value, the value is recorded, and the number of unqualified times of the corresponding ultrasonic sensor is counted; for each of the ultrasonic sensors, if the cumulative number of unqualified times exceeds the preset threshold number, it is judged to be unqualified; conversely, if the number of unqualified times of all ultrasonic sensors does not exceed the preset threshold number, it is judged to be qualified.

9. The wheel rim air tightness detection method according to claim 8, characterized in that: The threshold number of unqualified times is 3 times.

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