Application of Helium Mass Spectrometer Leak Detection in Steel Barrel Manufacturing for Packaging
Funeral
With the development and progress of society, more and more industries use steel drum packaging to store and transport goods. Regardless of the physical state of the items contained, strict requirements are imposed on the sealing performance of the container itself, that is, the steel drum itself.
In the manufacturing process of steel drums, the majority of steel drum manufacturers have greatly improved the sealing performance of steel drums by innovating and improving the production process. However, the manufacturer of steel drums has been plagued by how to detect the tightness of the finished steel drum and quantitatively judge the airtightness of the steel drum. Therefore, the steel drum manufacturing industry is paying more and more attention and actively looking for a new airtightness detection method for steel drums.
At present, the domestic barrel industry generally adopts the method recommended by the national standard GB/T 17344-1998 for leak detection. That is, the test sample is inflated to a predetermined pressure, immersed in water or coated with a thin layer of the specified liquid. The sample was judged for leaks by checking for the presence or absence of bubbles. This kind of detection method will inevitably lead to the following insurmountable problems for large-scale production enterprises. The first is the low detection efficiency and the long time consumed by the testing process, which seriously restricts the production capacity of the producer. Second, manual observation, misjudgment, missed judgment, and wrong judgment cannot be avoided, and the quality of the finished barrel cannot be effectively controlled. Third, the leakage rate of the finished product can not be accurately obtained, and the result of the judgment can only be leaked or not leaked. Fourth, the steel drum after the inspection needs to increase the decontamination and drying process.
After entering the 20th century, domestic and foreign testing sciences have developed by leaps and bounds. Helium mass spectrometry leak detection technology is also widely used in various industries. The use of fully automatic steel drum helium leak detection equipment is best illustrated. In developed countries such as Europe, the United States, and Japan, the barrel industry has comprehensively adopted the mass spectrometer leak detection equipment as the standard configuration of the barrel production line for the airtightness detection of steel drums.
The helium mass spectrometer leak detection method is a leak detection method in which helium is used as a search gas for leaky holes, and a helium mass spectrometer is used to detect leaks. The utility model has the advantages of high reaction speed, high detection precision, large detectable range, no toxicity, no pollution, high efficiency and no radioactivity.
The automatic steel barrel æ°¦ leak detection equipment is a set of electromechanical integration devices consisting of automatic filling, vacuum box, helium mass spectrometer leak detector, automatic workpiece transfer and electrical control. It uses the vacuum box method to carry out the helium mass spectrometer leak detection of the steel drum, and automatically feeds the helium-filled steel drum into a vacuum box which is slightly larger than the workpiece, and after vacuuming the vacuum box through the vacuum pump set, the leak detector and the vacuum The box is connected to detect the overall leak rate of the workpiece. The whole detection process is centered on the microcomputer, controlled by PLC, and displayed on a color touch screen to display various information. At the same time, the leak detector and the vacuum box are organically combined without manual intervention.
â—The working process of automatic steel drum æ°¦ leak detection equipment is as follows:
1. Fill the steel drum with the specified pressure of helium in the steel drum flowing out of the previous process. Since the steel drum can not withstand higher vacuum and higher pressure under normal circumstances, it is necessary to quickly fill a certain amount of helium into the barrel, that is, open the lid, manually fill the barrel with a filling gun, and then tighten the lid. At this time, the pressure in the barrel is the normal standard atmospheric pressure. The radon concentration is the ratio of the volume filled with helium to the inner volume of the steel drum, generally about 1% to 5%.
2. The steel drum filled with helium gas is sent to the vacuum box through the automatic production line, and then the pump unit is evacuated to start vacuuming the vacuum box. After the specified vacuum degree, the leak detector is connected to the vacuum box to measure the signal in the vacuum box. If there is a leak in the steel drum, the helium gas will enter the vacuum box through the leak hole, and the leak detector will display the leak rate value.
3. The manufacturer can set the unqualified leak rate according to the requirements of different customers. The inspection system automatically determines whether the leakage of the steel drum exceeds the preset alarm value. Less than the set value, the steel drum is qualified. If it is greater than the set value, the steel drum is deemed to be unqualified, and the system automatically sends out an alarm signal.
4. According to the results given by the inspection system, the automatic device automatically assigns qualified and unqualified steel drums to the qualified production line and the non-conforming product area.
â—Characteristics of automatic steel drum æ°¦ leak detection equipment:
1. The automatic steel drum æ°¦ leak detection equipment can automatically, quickly and accurately detect the leak rate of the steel drum to be tested.
2. The production line and the helium mass spectrometer leak detection technology are closely combined to realize the automatic and continuous production process and detection process.
3. The man-machine interface includes regular monitoring screens, fault alarm screens, real-time data and device status display, parameter settings, etc. In addition, it also includes data management report, data query and other data functions.
4, automatic steel drum æ°¦ leak detection equipment can work 24 hours a day, instead of manual inspection and judgment, to eliminate the impact of human factors on the test results.
5. The automatic steel drum æ°¦ leak detection equipment in the single box of the vacuum box can realize the function of detecting 6 steel drums per minute, which greatly improves the production efficiency.
6. The core mechanical movement part lifting mechanism adopts a special motor transmission mechanism combined with the frequency converter control method. Compared with the traditional cylinder control mechanism, it has the advantages of reliable operation, accurate positioning, long service life and adjustable movement speed. .
7. The equipment is easy to operate, and all control can be completed by operating on the man-machine interface.
8. The equipment can be adjusted according to the height of the steel drum to be tested, so it can adapt to the detection of the variety of steel drums.
9. The equipment is simple in structure, easy to maintain and repair, mainly consists of fewer parts, fewer parts and low maintenance costs.
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