Leak detection machine control system for detecting sealing gasket

Abstract

The invention relates to the field of leak hunting machines, in particular to a leak hunting machine control system for detecting a sealing gasket, which is used for solving the problems that leakage time in a monitoring result cannot be determined and self interference of a leak hunting machine is difficult to eliminate because the leak hunting machine lacks a supervisory system in a using process. According to the invention, the operation process of the leak detection machine is supervised through the intelligent control system, thereby obtaining the air pressure of the internal and external environments where the sealing gasket is located in real time, determining the sealing performance of the sealing gasket according to the change of the air pressure of the external environment, and determining the occurrence time of leakage through a data time axis analysis mode. In the operation process of the leak hunting machine, the data rationality and the inner air pressure change speed of the leak hunting machine are analyzed, so that the operation condition of the leak hunting machine is supervised, the working condition of the leak hunting machine is supervised according to the supervision result, and the work efficiency of the leak hunting machine is improved. And the test result deviation caused by the abnormal working condition of the leak detection machine is avoided.

Description

Technical Field

[0001] The invention relates to the field of leak detectors, in particular to a leak detector control system for detecting sealing gaskets. Background Art

[0002] Also known as a leak detector, it is mainly used in the automotive, internal combustion engine, motorcycle, compressor and other industries. It is an important equipment for detecting the leakage status of its components and ensuring product quality. The main leak testers on the market are: dry airtight leak tester, dry-wet combination airtight leak tester, flow detection airtight leak tester, engine assembly airtight leak tester. Most of the test machines operate by sealing the workpiece to be tested, and then using clean and dry air as a medium through the leak detector to inflate, balance, pressurize, measure, and exhaust the inner cavity of the workpiece to be tested; and display the leakage rate after measurement. Its advantages are short test cycle and quantitative display of test results.

[0003] At present, the leak detector in the prior art still has shortcomings. The existing leak detector lacks an effective intelligent control system when in use, so that the detection process can only output the detection result after the detection is completed. Although this method can detect the leak, it cannot determine the time when the leak occurs. At the same time, there is a lack of effective judgment on the measurement interference caused by the leak detector itself, which may lead to deviations in the test results due to poor working conditions of the leak detector.

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] In the present invention, the operation process of the leak detector is monitored by an intelligent control system, so as to obtain the air pressure of the internal and external environments where the sealing gasket is located in real time, and the sealing of the sealing gasket is determined according to the change of the external environmental air pressure. At the same time, the occurrence time of the leakage is determined by means of data timeline analysis, so that the detection result of the sealing gasket is more comprehensive. During the operation of the leak detector, the data rationality of the leak detector and the speed of change of the internal air pressure are analyzed to monitor the operation of the leak detector itself, and the working condition of the leak detector itself is monitored according to the supervision result, so as to avoid the deviation of the test result caused by the abnormal working condition of the leak detector itself, and solve the problem that the leak detector lacks a supervision system during use, resulting in the inability to determine the leakage time in the monitoring result and the difficulty in eliminating the interference of the leak detector itself, and a leak detector control system for detecting sealing gaskets is proposed.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A leak detector control system for detecting a sealing gasket, comprising a test collection unit, a process analysis unit, a test control unit, an abnormal cycle unit and a result output unit, wherein the test collection unit is used to collect the ambient air pressure and the applied air pressure during the test process, record them as the external air pressure and the internal air pressure, and record the collection time of the external air pressure or the internal air pressure and send it to the process analysis unit;

[0008] The test control unit is used to control the leakage test of the sealing gasket, and controls the start and end of the sealing gasket test process and the air pressure applied during the test by generating a signal;

[0009] The process analysis unit is used to monitor the air pressure during the test process, and generate corresponding test abnormality signals, gas leakage signals, normal pressurization signals, and excessive pressurization signals according to the changes in the internal and external air pressures during the test process;

[0010] The process analysis unit can draw an internal air pressure change image and an external air pressure change image according to the air pressure during the test;

[0011] The abnormal circulation unit performs an overall analysis based on the internal air pressure change image and the external air pressure change image, and judges the correctness of the sealing gasket test process based on the analysis result;

[0012] The result output unit is used to receive the leakage time and the leakage pressure, and output the leakage time and the leakage pressure.

[0013] As a preferred embodiment of the present invention, the test control unit controls the sealing gasket detection work through a test start signal, and sends the test start signal to the test acquisition unit. After receiving the test start signal, the test acquisition unit collects the air pressure of the test environment of the sealing gasket and records it as the external air pressure. At the same time, the time of air pressure collection is recorded. The test acquisition unit sends the external air pressure and the collection time to the process analysis unit.

[0014] The test collection unit collects air pressure in the pressurized environment of the test at preset intervals and records it as the internal air pressure. The test collection unit also records the time when the internal air pressure is collected, and sends the internal air pressure and the time when the internal air pressure is collected to the process analysis unit.

[0015] As a preferred embodiment of the present invention, the method for the process analysis unit to generate a gas leakage signal is:

[0016] After obtaining the external air pressure, the process analysis unit records the first set of external air pressures obtained at the beginning of the test as the initial external air pressure, and compares the external air pressure with the initial external air pressure each time the external air pressure is obtained subsequently. If the difference between the external air pressure and the initial external air pressure is greater than a preset difference, a gas leakage signal is generated;

[0017] The process analysis unit sends a gas leakage signal to the test control unit, and the test control unit stops the gas leakage test after receiving the gas leakage signal.

[0018] As a preferred embodiment of the present invention, the method for the process analysis unit to generate a test abnormality signal is:

[0019] The process analysis unit compares the latest set of external air pressures obtained each time with the previous set of external air pressures. If the latest set of external air pressures is greater than the previous set of external air pressures, a gas leakage signal is generated; if the latest set of external air pressures is less than the previous set of external air pressures, a test abnormality signal is generated;

[0020] The process analysis unit sends the test abnormality signal to the test control unit, and the test control unit stops the air leakage test after obtaining the test abnormality signal.

[0021] As a preferred embodiment of the present invention, the method for the process analysis unit to generate a normal pressurization signal or an over-rapid pressurization signal is:

[0022] The process analysis unit calculates the difference between two adjacent groups of internal air pressures each time the internal air pressure is obtained, and compares the difference between the two groups of internal air pressures with the pressurization threshold value. If the difference between the two groups of internal air pressures is greater than the preset pressurization threshold value, a pressurization too fast signal is generated; if the difference between the two groups of internal air pressures is not greater than the preset pressurization threshold value, a pressurization normal signal is generated;

[0023] The process analysis unit sends a pressurization too fast signal to the test control unit, and the test control unit slows down the pressurization speed after receiving the pressurization too fast signal.

[0024] As a preferred embodiment of the present invention, the process analysis unit uses the time of external air pressure acquisition as the horizontal axis and the external air pressure as the vertical axis to draw an external air pressure change image, and sends the external air pressure change image to the abnormal circulation unit; the process analysis unit uses the time as the horizontal axis and the internal air pressure as the vertical axis to draw an internal air pressure change image, and sends the internal air pressure change image to the abnormal circulation unit; the abnormal circulation unit obtains a pressurization process image through a test control unit, wherein the pressurization process image is an image of the change of the applied pressure over time when the test control unit performs pressurization control on the leak detector.

[0025] As a preferred embodiment of the present invention, the abnormal circulation unit compares the internal air pressure change image with the pressurization process image, calculates the difference of the vertical axis coordinates corresponding to the same coordinate point to obtain the vertical axis difference, and the abnormal circulation unit performs arithmetic average on all vertical axis differences to obtain the average vertical axis difference. The abnormal circulation unit compares the average vertical axis difference with a preset difference threshold. If the average vertical axis difference is greater than the preset difference threshold, a process abnormality signal is generated and the process abnormality signal is sent to the abnormal circulation unit. If the average vertical axis difference is less than or equal to the preset difference threshold, the maximum value of all vertical axis differences is obtained, and the maximum value of all vertical axis differences is compared with a preset upper limit value. If the maximum value of the vertical axis differences is greater than the preset upper limit value, a process abnormality signal is generated; if the maximum value of the vertical axis differences is not greater than the preset upper limit value, a process normal signal is generated.

[0026] As a preferred embodiment of the present invention, after generating the normal process signal, the abnormal circulation unit integrates the internal air pressure change image and the pressurization process image to generate a pressurization change image. The generation process of the pressurization change image is as follows:

[0027] The abnormal circulation unit overlaps the internal air pressure change image and the pressurization process image through the horizontal axis, and calculates the average value of the two groups of vertical coordinates corresponding to the same horizontal coordinate after the overlap, and uses the calculated average value as the new vertical coordinate. Similarly, the average value of the vertical coordinates of all horizontal coordinates in the internal air pressure change image and the pressurization process image is calculated to generate a curve composed of new vertical coordinates, which is recorded as the pressurization change image.

[0028] As a preferred embodiment of the present invention, the abnormal circulation unit selects two horizontal axis points with a preset time interval on the external air pressure change image, and connects the two vertical axis points corresponding to the two horizontal axis points through a straight line, the abnormal circulation unit calculates the slope of the straight line, and records it as the external air pressure change slope, the abnormal circulation unit calculates the external air pressure change slope of all points on the external air pressure change image from left to right along the horizontal axis, and generates a gas leakage point when the external air pressure change slope is greater than the preset slope for the first time, and obtains the time on the horizontal axis corresponding to the gas leakage point, which is recorded as the leakage time, the abnormal circulation unit marks the leakage time on the pressurization change image, obtains the vertical axis coordinate corresponding to the leakage time, and records the internal air pressure corresponding to the vertical axis coordinate as the leakage pressure;

[0029] The abnormal circulation unit sends the leakage pressure and leakage time to the result output unit, and the result output unit displays the leakage pressure through a display device and outputs the leakage pressure and leakage time in text form.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the present invention, when the leak detector is used to detect the gasket, the operation process of the leak detector is supervised by an intelligent control system, so as to obtain the air pressure of the internal and external environment where the gasket is located in real time, and determine the sealing performance of the gasket according to the change of the external environment air pressure. At the same time, when the gasket leaks, the time of occurrence of the leakage is determined by data time axis analysis, so that the detection result of the gasket is more comprehensive, and the gasket leakage result and leakage time can be output at the same time.

[0032] 2. In the present invention, during the operation of the leak detector, the rationality of the data of the leak detector and the speed of change of the internal air pressure are analyzed, so as to supervise the operation of the leak detector itself, and the working condition of the leak detector itself is supervised according to the supervision result to avoid the deviation of the test result caused by the abnormal working condition of the leak detector itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0034] Figure 1 is a system block diagram of the present invention; Figure 2 It is a system flow chart of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] See also Figure 1 - Figure 2 As shown, a control system of a leak detector for detecting a sealing gasket includes a test acquisition unit, a process analysis unit, a test control unit, an abnormal circulation unit and a result output unit. The test control unit is used to generate a test control signal to control the loading and unloading of the sealing gasket and the performance of the sealing test. The test control unit generates a test start signal and sends the test start signal to the test acquisition unit. At the same time, the test control unit controls the leak detector to pressurize through the test start signal to perform the sealing gasket detection work;

[0038] After receiving the test start signal, the test collection unit collects the air pressure of the test environment of the sealing gasket and records it as the external air pressure, so as to check whether there is gas overflow from the sealing gasket. When collecting the air pressure of the test environment, the test collection unit continuously collects the air pressure at short intervals and records the time of air pressure collection. The test collection unit sends the external air pressure and the collection time to the process analysis unit;

[0039] After receiving the test start signal, the test collection unit collects the air pressure of the pressurized environment of the test at a preset interval and records it as the internal air pressure, thereby obtaining the gas pressure inside the sealing gasket. The test collection unit also records the time when the internal air pressure is collected. The test unit sends the internal air pressure and the time when the internal air pressure is collected to the process analysis unit;

[0040] After obtaining the external air pressure, the process analysis unit records the first set of external air pressures obtained at the beginning of the test as the initial external air pressure, and compares it with the initial external air pressure each time the external air pressure is obtained subsequently. If the difference between the external air pressure and the initial external air pressure is greater than the preset difference, a gas leakage signal is generated and sent to the test control unit. After receiving the gas leakage signal, the test control unit stops the leakage test and reminds in the form of text display on the display device;

[0041] The process analysis unit compares the latest set of external air pressures obtained each time with the previous set of external air pressures. If the latest set of external air pressures is greater than the previous set of external air pressures, a gas leakage signal is generated. If the latest set of external air pressures is less than the previous set of external air pressures, a test abnormality signal is generated. The process analysis unit sends the test abnormality signal to the test control unit. After obtaining the test abnormality signal, the test control unit stops the gas leakage test, displays the test abnormality signal through the display device, and simultaneously issues an audible and visual alarm to remind the management personnel.

[0042] Each time the process analysis unit obtains the internal air pressure, it calculates the difference between the two adjacent groups of internal air pressures, and compares the difference between the two groups of internal air pressures with the pressurization threshold. If the difference between the two groups of internal air pressures is greater than the preset pressurization threshold, a pressurization over-rapid signal is generated; if the difference between the two groups of internal air pressures is not greater than the preset pressurization threshold, a pressurization normal signal is generated, and the process analysis unit sends the pressurization over-rapid signal to the test control unit. After receiving the pressurization over-rapid signal, the test control unit slows down the pressurization speed.

[0043] Embodiment 2:

[0044] See also Figure 1 - Figure 2 As shown, the process analysis unit uses the time of external air pressure collection as the horizontal axis and the external air pressure as the vertical axis to draw an external air pressure change image, and sends the external air pressure change image to the abnormal circulation unit;

[0045] The process analysis unit draws an internal air pressure change image with time as the horizontal axis and internal air pressure as the vertical axis, and sends the internal air pressure change image to the abnormal circulation unit;

[0046] The abnormal circulation unit obtains a pressurization process image through the test control unit, wherein the pressurization process image is an image of the change of the applied pressure over time when the test control unit controls the leak detector to pressurize;

[0047] The abnormal circulation unit compares the internal air pressure change image with the pressurization process image, calculates the difference of the longitudinal axis coordinates corresponding to the same coordinate point, obtains the longitudinal axis difference, and performs arithmetic average on all longitudinal axis differences to obtain the average longitudinal axis difference. The abnormal circulation unit compares the average longitudinal axis difference with a preset difference threshold. If the average longitudinal axis difference is greater than the preset difference threshold, a process abnormality signal is generated and sent to the abnormal circulation unit. If the average longitudinal axis difference is less than or equal to the preset difference threshold, the maximum value of all longitudinal axis differences is obtained, and the maximum value of all longitudinal axis differences is compared with a preset upper limit value. If the maximum value of the longitudinal axis differences is greater than the preset upper limit value, a process abnormality signal is generated. If the maximum value of the longitudinal axis differences is not greater than the preset upper limit value, a process normal signal is generated.

[0048] After generating the normal signal of the process, the abnormal circulation unit combines the internal air pressure change image and the pressurization process image to generate the pressurization change image. The generation process of the pressurization change image is as follows:

[0049] The abnormal circulation unit overlaps the internal air pressure change image and the pressurization process image through the horizontal axis, and calculates the average value of the two groups of vertical coordinates corresponding to the same horizontal coordinate after the overlap, and uses the calculated average value as the new vertical coordinate. Similarly, the average value of the vertical coordinates of all horizontal coordinates in the internal air pressure change image and the pressurization process image is calculated to generate a curve composed of new vertical coordinates, which is recorded as the pressurization change image.

[0050] The abnormal circulation unit selects two horizontal axis points with a preset time interval on the external air pressure change image, and connects the two vertical axis points corresponding to the two horizontal axis points through a straight line. The abnormal circulation unit calculates the slope of the straight line and records it as the external air pressure change slope. The abnormal circulation unit calculates the external air pressure change slope of all points on the external air pressure change image from left to right along the horizontal axis. When the external air pressure change slope is greater than the preset slope for the first time, a gas leakage point is generated, and the time on the horizontal axis corresponding to the gas leakage point is obtained and recorded as the leakage time. The abnormal circulation unit marks the leakage time on the pressurization change image, obtains the vertical axis coordinate corresponding to the leakage time, and records the internal air pressure corresponding to the vertical axis coordinate as the leakage pressure.

[0051] The abnormal circulation unit sends the leakage pressure and leakage time to the result output unit, and the result output unit displays the leakage pressure through the display device and outputs the leakage pressure and leakage time in text form.

[0052] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A leak detector control system for detecting a sealing gasket, characterized in that: It includes a test collection unit, a process analysis unit, a test control unit, an abnormal cycle unit and a result output unit. The test collection unit is used to collect the ambient air pressure and the applied air pressure during the test, record them as external air pressure and internal air pressure, and record the collection time of the external air pressure or the internal air pressure and send it to the process analysis unit; The test control unit is used to control the leakage test of the sealing gasket, and controls the start and end of the sealing gasket test process and the air pressure applied during the test by generating a signal; The process analysis unit is used to monitor the air pressure during the test process, and generate corresponding test abnormality signals, gas leakage signals, normal pressurization signals, and excessive pressurization signals according to the changes in the internal and external air pressures during the test process; The process analysis unit can draw an internal air pressure change image and an external air pressure change image according to the air pressure during the test; The abnormal circulation unit performs an overall analysis based on the internal air pressure change image and the external air pressure change image, and judges the correctness of the sealing gasket test process based on the analysis result; The result output unit is used to receive the leakage time and the leakage pressure, and output the leakage time and the leakage pressure.

2. A leak detector control system for detecting a sealing gasket according to claim 1, characterized in that: The test control unit controls the gasket detection work through the test start signal, and sends the test start signal to the test acquisition unit. After receiving the test start signal, the test acquisition unit collects the air pressure of the test environment of the gasket and records it as the external air pressure. At the same time, it records the time of air pressure collection. The test acquisition unit sends the external air pressure and the collection time to the process analysis unit. The test collection unit collects air pressure in the pressurized environment of the test at preset intervals and records it as the internal air pressure. The test collection unit also records the time when the internal air pressure is collected, and sends the internal air pressure and the time when the internal air pressure is collected to the process analysis unit.

3. A leak detector control system for detecting a sealing gasket according to claim 1, characterized in that: The method for the process analysis unit to generate a gas leakage signal is: After obtaining the external air pressure, the process analysis unit records the first set of external air pressures obtained at the beginning of the test as the initial external air pressure, and compares the external air pressure with the initial external air pressure each time the external air pressure is obtained subsequently. If the difference between the external air pressure and the initial external air pressure is greater than a preset difference, a gas leakage signal is generated; The process analysis unit sends a gas leakage signal to the test control unit, and the test control unit stops the gas leakage test after receiving the gas leakage signal.

4. A leak detector control system for detecting a sealing gasket according to claim 1, characterized in that: The method for the process analysis unit to generate a test abnormality signal is: The process analysis unit compares the latest set of external air pressures obtained each time with the previous set of external air pressures. If the latest set of external air pressures is greater than the previous set of external air pressures, a gas leakage signal is generated; if the latest set of external air pressures is less than the previous set of external air pressures, a test abnormality signal is generated; The process analysis unit sends the test abnormality signal to the test control unit, and the test control unit stops the air leakage test after obtaining the test abnormality signal.

5. A leak detector control system for detecting a sealing gasket according to claim 1, characterized in that: The method for the process analysis unit to generate a normal pressurization signal or an over-rapid pressurization signal is: The process analysis unit calculates the difference between two adjacent groups of internal air pressures each time the internal air pressure is obtained, and compares the difference between the two groups of internal air pressures with the pressurization threshold value. If the difference between the two groups of internal air pressures is greater than the preset pressurization threshold value, a pressurization too fast signal is generated; if the difference between the two groups of internal air pressures is not greater than the preset pressurization threshold value, a pressurization normal signal is generated; The process analysis unit sends a pressurization too fast signal to the test control unit, and the test control unit slows down the pressurization speed after receiving the pressurization too fast signal.

6. A leak detector control system for detecting a sealing gasket according to claim 1, characterized in that: The process analysis unit uses the time of external air pressure collection as the horizontal axis and the external air pressure as the vertical axis to draw an external air pressure change image, and sends the external air pressure change image to the abnormal circulation unit; the process analysis unit uses the time as the horizontal axis and the internal air pressure as the vertical axis to draw an internal air pressure change image, and sends the internal air pressure change image to the abnormal circulation unit; the abnormal circulation unit obtains a pressurization process image through the test control unit, wherein the pressurization process image is an image of the change of the applied pressure over time when the test control unit controls the leak detector to pressurize.

7. A leak detector control system for detecting a sealing gasket according to claim 1, characterized in that: The abnormal circulation unit compares the internal air pressure change image with the pressurization process image, calculates the difference of the vertical axis coordinates corresponding to the same coordinate point to obtain the vertical axis difference, and performs arithmetic average on all vertical axis differences to obtain the average vertical axis difference. The abnormal circulation unit compares the average vertical axis difference with the preset difference threshold. If the average vertical axis difference is greater than the preset difference threshold, a process abnormality signal is generated and sent to the abnormal circulation unit. If the average vertical axis difference is less than or equal to the preset difference threshold, the maximum value of all vertical axis differences is obtained, and the maximum value of all vertical axis differences is compared with the preset upper limit value. If the maximum value of the vertical axis differences is greater than the preset upper limit value, a process abnormality signal is generated. If the maximum value of the vertical axis differences is not greater than the preset upper limit value, a process normal signal is generated.

8. A leak detector control system for detecting a sealing gasket according to claim 7, characterized in that: After generating the normal signal of the process, the abnormal circulation unit integrates the internal air pressure change image and the pressurization process image to generate a pressurization change image. The generation process of the pressurization change image is as follows: The abnormal circulation unit overlaps the internal air pressure change image and the pressurization process image through the horizontal axis, and calculates the average value of the two groups of vertical coordinates corresponding to the same horizontal coordinate after the overlap, and uses the calculated average value as the new vertical coordinate. Similarly, the average value of the vertical coordinates of all horizontal coordinates in the internal air pressure change image and the pressurization process image is calculated to generate a curve composed of new vertical coordinates, which is recorded as the pressurization change image.

9. A leak detector control system for detecting a sealing gasket according to claim 8, characterized in that: The abnormal circulation unit selects two horizontal axis points with preset time intervals on the external air pressure change image, and connects the two vertical axis points corresponding to the two horizontal axis points through a straight line. The abnormal circulation unit calculates the slope of the straight line and records it as the external air pressure change slope. The abnormal circulation unit calculates the external air pressure change slopes of all points on the external air pressure change image from left to right along the horizontal axis. When the external air pressure change slope is greater than the preset slope for the first time, a gas leakage point is generated, and the time on the horizontal axis corresponding to the gas leakage point is obtained and recorded as the leakage time. The abnormal circulation unit marks the leakage time on the pressurization change image, obtains the vertical axis coordinate corresponding to the leakage time, and records the internal air pressure corresponding to the vertical axis coordinate as the leakage pressure. The abnormal circulation unit sends the leakage pressure and leakage time to the result output unit, and the result output unit displays the leakage pressure through a display device and outputs the leakage pressure and leakage time in text form.

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