Metal packaging container æ°¦ mass spectrometer leak detection system solution
Zhang Heyi
I. Current development of metal detector helium mass spectrometer leak detection system
1. Thin wall steel barrel testing equipment:
â— The filling pressure of the testing equipment is: 1 bar;
â— The first generation of products developed in 2009 (fast line): 12 seconds / only;
â— The fourth generation of products developed in 2011 (high-speed line): 7 seconds / only;
â— Has become the only successful manufacturer of steel drum leak detection equipment in China;
â— Patented in the domestic metal packaging container æ°¦ mass spectrometer leak detection equipment.
2, Germany Audi car fuel dispenser testing equipment:
â— Filling helium pressure: 255bar;
â—The mechanical mechanism is fully automatically blocked into 6 nozzle heads with an angle of 157 degrees, and the beat is automatically 30 seconds/only;
â—High degree of mechanization and stable high-voltage detection data;
â— It is the only successful manufacturer of double-station 255bar high-pressure helium leak detection equipment.
Second, the leakage of steel drums for exporting dangerous goods is worrying
According to reports, the Shenzhen Inspection and Quarantine Bureau found that many batches of export steel drums were unqualified when testing the steel drums for dangerous goods packaging, and the unqualified rate reached 15.22%. All of them were unqualified for the leakage test. The main reason was The advanced barreling equipment and processes have not been updated in time, and the production of raw materials has not been strictly controlled. Steel drums are widely used in export packaging, and are often used for shipping dangerous materials that are toxic, corrosive or flammable and explosive, such as coatings, isopropyl alcohol, and resin solutions. Once leaked or leaked, the consequences are unimaginable, and the quality of steel drums The problem should be highly valued.
Shenzhen Inspection and Quarantine Bureau recommends: First, enterprises should update equipment, update worn molds in time, improve production technicians' ability and master reasonable technology; second, enterprises must strictly control the quality of raw materials, especially sealants and seals. Third, the inspection and quarantine departments must strictly control and increase the intensity of steel drums for exporting dangerous goods.
Third, the development trend of helium mass spectrometer leak detection system
In addition to the increasing popularity of container seal inspection, helium mass spectrometer leak detection systems have been gradually applied to the detection of leaks in various other parts such as automotive pipelines, automobile hubs, heat exchangers, and air conditioner compressors.
4. What is the helium mass spectrometer leak detection?
As a leakage gas for helium mass spectrometry, helium is a special gas that is easily detected by the mass spectrometer when it passes through the leaking portion of the container.
Helium is the most ideal gas for leak detection. It is non-toxic, light, inexpensive, non-flammable, chemically inert, and has small gas molecules.
In theory, the completion of non-leaking steel drums and container-type workpieces does not exist at all. There are three main purposes for our venting:
1. Control the leakage within an acceptable range;
2. Does not affect the normal use of the workpiece at the end user;
3. Acceptable leakage does not affect the customer.
Five, the characteristics of helium mass spectrometer leak detection
1. The difference between helium mass spectrometry leak detection and water inspection pressure inspection
â—The level of leak detection is different, as shown in the figure below.
â—æ°¦Detection leak detection accuracy is high, reliable and stable
â—æ°¦Detection for dry leak detection
â— can be analyzed by data
â—It can detect products that cannot be detected by water inspection and pressure inspection.
2, leak detection unit description
The leakage rate of the leak detection device is mbar.l/s. In the case of a 10 L container, the pressure in the 80 cc inner container changes by 2 mbar. Then the leak rate Q is calculated by the following formula:
3, the shortcomings of other leak detection methods
The air pressure method is a low-sensitivity leak detection method. A bicycle tire with a volume of 1 liter has an internal pressure of 4 bar (kg). If the gas leaks within 24 hours, it is equivalent to a leak of 3 bar. The leak rate of 1L is 3.5×10-2 mbar.l/s= per There is 1 bubble with a radius of 2mm in seconds.
The differential pressure rule takes too long to detect leaks. A 1 liter container is raised from 3 bar to 4 bar, and assuming a leak rate of 1 x 10-2 mbar.l/s, he takes 1.16 days. The calculation method is as follows:
4, æ°¦ mass spectrometry leak detection accuracy and beat
â— Detection accuracy: Our equipment detection accuracy can reach 10-8 mbar.l / s.
â—Detecting the beat: As it is a large machine production, which meets and exceeds the front-end barrel equipment, the fourth generation of products designed and manufactured by our company can reach 6 seconds/only.
6. How is the Shanghai Xianri æ°¦ leak detection equipment made?
1, we have three high advantages
â—High-end design: unmanned operation design, compact structure, accurate robot positioning, first-class leak detection process, humanized operation process
â—High configuration: German vacuum pump set, German leak detector, Swiss vacuum valve, international brand electrical
â—High performance: advanced calibration unit, repeated data test leak test experience data test
2, equipment outline drawing
Seven, steel drum leak detection operation principle
1. Filling with helium: filling a certain amount of helium into the steel drum
Brief description of the legend:
â— Fill the inside of the workpiece with 1% helium.
â— Control the charging through a separate electric control cabinet, and the sound and light prompts when the charging is completed.
â— The amount of helium used costs about 0.2 to 0.3 yuan for a steel drum.
Fill the steel drum with a certain amount of helium
2. Equipment operation process:
â— The servo hoist transports the steel drum to the vacuum box.
â— Pump the vacuum box and pump it to check the vacuum.
â— The leak detector connected to the leak detector opens to detect the helium leak rate and judges whether it is qualified or not.
â— The vacuum box is broken, and the servo hoist removes the steel drum from the vacuum box.
Equipment operation process
Brief description of the legend:
â— The above picture shows the inspection process diagram of a station, and the duplex station is interleaved.
â— The calibration picture is shown above, which indicates that there is a calibration function. The specific operation will be described in detail later.
3, performance guarantee
â— Don't forget! Helium mass spectrometer leak detection equipment is a testing equipment, which must be calibrated in order to ensure the accuracy of leak detection.
â— Standard leak: It is a hole whose leak rate is known. Use it to calibrate whether the equipment is accurate or not.
4, calibration method
◠The standard leak leak rate value is shown in the label. It is assumed that the standard leak rate is 4.0×10-4 mbar.l/s.
◠Put the standard barrel into the system for inspection. Observe whether the leak rate is 4.0×10-4 mbar.l/s. If not, correct the leak detector scale factor until the actual value and the standard leak value are the same. .
â— The installation and connection method of the standard leak hole in the standard barrel is as shown below.
â— Key: Q standard leak calibration value = Q detection actual value.
Installation and connection method for standard leak holes in standard barrel
Eight, the guarantee of character
Since the birth of the first generation of products in 2008, the users of our steel drum leak detectors have spread all over the country. The main users are:
â— Ningbo Xindao Enterprise Service Co., Ltd.
â—COFCO (Kunshan) Packaging Container Co., Ltd.
â—Hangzhou Jinsheng Packaging Container Co., Ltd.
â—Ningbo Jilong Metal Products Co., Ltd.
â—Shanghai Tianhaoda Chemical Packing Co., Ltd.
â—Laiyang Far East Co., Ltd.
â—Yantai Uniform Packaging Container Co., Ltd.
From the first generation in 2008 to 12 seconds/only, to the fourth generation in 2011, 6 seconds/only. Technological innovation is a must for every second, and leak detection experience keeps pace with the times!
(This article was edited by Yang Wenliang according to the speech of Mr. Zhang Heyi)
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