Integrated multi-mode food packaging bag sealing detection device

Abstract

The utility model relates to packing bag sealing detection technical field discloses an integrated multi -mode food packing bag sealing detection device, include: air -exhaust module, sampling module, mass spectrum analysis module, the sample to be measured is placed in sampling module, sampling module and mass spectrum analysis module can be on -off connection, and air -exhaust module is respectively with sampling module and mass spectrum analysis module can be on -off connection, through the on -off of adjustment air -exhaust module, sampling module, mass spectrum analysis module between, the device carries out leak rate detection to the sample to be measured under static voltage -boosting mode or vacuum attenuation mode or mass spectrum leak detection mode. The application can realize the switching of the device among static voltage -boosting mode, vacuum attenuation mode and mass spectrum leak detection mode by changing the connection relationship among the air -exhaust module, sampling module and mass spectrum analysis module, and can realize leak rate detection on different types of food packing bags and different sealing levels, solving the problem of difficulty in rapid quantitative test of food sealing.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag sealing detection technology, and in particular to an integrated multi-mode food packaging bag sealing detection device. Background Technology

[0002] Sealed packaging is a crucial element of modern food preservation technology. By isolating food from outside air, it effectively prevents the intrusion of oxygen, moisture, and contaminants. In an anaerobic atmosphere, microbial activity is inhibited, significantly slowing down the rate of food spoilage. Simultaneously, it prevents the loss of natural flavors and nutrients, maintaining the original taste and quality of the food. Sealed packaging is also key to extending the shelf life of food.

[0003] The airtightness of ordinary food packaging relies on the sealing process and the material of the sealing bag. During production, it's not necessary to test the airtightness of packaged food. Even if a small amount of sealed food fails to seal, the disposal cost is very low. Furthermore, disregarding weight costs, multi-layered sealing bags can be used to improve the reliability of food packaging requiring higher airtightness. Testing the airtightness of packaged food would be far more costly than the loss from seal failure. Therefore, there is currently no practical need for post-packaging airtightness testing of ordinary food products.

[0004] Certain specialty foods are characterized by high transportation and disposal costs, and the storage atmosphere differs from the general atmosphere. Due to the high transportation costs, multi-layered sealing is unsuitable for the packaging of these special foods. During transportation, severe vibrations and accelerations cause significant changes in pressure difference between the inside and outside of the food bag, leading to the breaching or further expansion of weak points in the seal (usually micropores), resulting in seal failure. Furthermore, the pressure difference between the storage atmosphere and the original packaging atmosphere can cause the food bag to swell due to seal failure. Seal failure in food means increased waste disposal pressure and loss of stored food. Significant losses can impact the duration of missions. Therefore, specialty foods require packaging bags with highly stable and reliable seals.

[0005] Research indicates that the vast majority of specialty foods are currently vacuum-sealed. While testing the seal strength of the same batch of sealed bags is used to assess their sealing performance, there is no individual testing of the leakage rate for each food bag. Therefore, a device capable of leak testing for food packaging bags is needed. Utility Model Content

[0006] In view of this, the present invention provides an integrated multi-mode food packaging bag sealing detection device to realize leakage rate testing of food packaging bags, and solves the problem of difficulty in rapid quantitative testing of food sealing performance.

[0007] Specifically, the following technical solutions are included: This application provides an integrated multi-mode food packaging bag seal detection device, comprising: Gas extraction module, sampling module, mass spectrometry analysis module; The sample to be tested is placed in the sampling module; The sampling module and the mass spectrometry analysis module are connected in a switchable manner, and the gas extraction module is connected in a switchable manner to both the sampling module and the mass spectrometry analysis module. By adjusting the on / off states between the gas extraction module, the sampling module, and the mass spectrometry analysis module, the device can detect the leak rate of the sample under test in static pressure boost mode, vacuum decay mode, or mass spectrometry leak detection mode.

[0008] For example, when the device is operating in static boost mode, the vacuum module and the sampling module are connected, the vacuum module evacuates the sampling module, and the device performs leak rate detection on the sealing performance of the sample under the first vacuum condition of the sampling module. When the device is operating in vacuum decay mode, the pumping module and the sampling module are connected. The pumping module evacuates the sampling module, and the device performs leak rate detection on the sealing performance of the sample under the second vacuum condition of the sampling module. When the device is operating in mass spectrometry leak detection mode, the gas extraction module is connected to the sampling module and the mass spectrometry analysis module respectively. The sampling module is connected to the mass spectrometry analysis module. The gas extraction module evacuates the sampling module and the mass spectrometry analysis module. The device performs leak rate detection on the sealing of the sample under the third vacuum condition of the sampling module.

[0009] For example, the sampling module includes a first detection chamber, a first vacuum gauge, and a second vacuum gauge; The first vacuum gauge and the second vacuum gauge are mounted on the first detection chamber and are used to detect the vacuum level inside the first detection chamber; The first vacuum gauge and the second vacuum gauge have different measuring ranges; The first detection chamber is connected to the gas extraction module and the mass spectrometry analysis module, respectively.

[0010] For example, the mass spectrometry analysis module includes a second detection chamber, a third vacuum gauge, and a quadrupole mass spectrometer; The third vacuum gauge is installed on the second detection chamber and is used to detect the vacuum level inside the second detection chamber; The quadrupole mass spectrometer is connected to the second detection chamber; The second detection chamber is connected to the sampling module and the air extraction module, respectively.

[0011] For example, the pumping module includes a first molecular pump, a second molecular pump, a first dry pump, and a second dry pump; The first molecular pump and the first dry pump are respectively connected to the sampling module, and the first molecular pump and the first dry pump are connected together. The second molecular pump and the second dry pump are connected in series, and the second molecular pump is connected to the mass spectrometry analysis module; The second molecular pump and the second dry pump are respectively connected to the sampling module.

[0012] For example, when the device is operating in static boost mode, the first dry pump and the sampling module are connected, and the first dry pump evacuates the sampling module to a fourth vacuum condition; The first dry pump is disconnected from the sampling module, the first dry pump and the first molecular pump are connected in series, the first molecular pump and the sampling module are connected, and the first dry pump and the first molecular pump evacuate the sampling module to a first vacuum condition. The first molecular pump and the sampling module are disconnected, and the device performs leak rate detection on the sealing of the sample under the first vacuum condition of the sampling module.

[0013] For example, when the device is operating in vacuum decay mode, the first dry pump and the sampling module are connected, and the first dry pump evacuates the sampling module to a second vacuum condition; The first dry pump and the sampling module are disconnected, and the device performs leak rate detection on the sealing of the sample under the second vacuum condition of the sampling module.

[0014] For example, when the device is operating in mass spectrometry leak detection mode, the first dry pump and the sampling module are connected, and the first dry pump evacuates the sampling module to the fifth vacuum condition; The second dry pump is connected to the sampling module, and the first dry pump and the second dry pump evacuate the sampling module to the sixth vacuum condition; Both the first dry pump and the second dry pump are disconnected from the sampling module. The first dry pump and the first molecular pump are connected in series. The second dry pump and the second molecular pump are connected in series. The first molecular pump and the second molecular pump are respectively connected to the sampling module. The second molecular pump is connected to the mass spectrometry molecular module. The first dry pump, the first molecular pump, the second dry pump and the second molecular pump evacuate the sampling module to a third vacuum condition. Both the first molecular pump and the second molecular pump are disconnected from the sampling module, while the sampling module is connected to the mass spectrometry analysis module. The device performs leak rate detection on the sealing performance of the sample under the third vacuum condition of the sampling module.

[0015] For example, the device further includes a leak rate calibration module; The leakage rate calibration module includes a first calibration leak hole, a second calibration leak hole, and a third calibration leak hole; The first calibration leak, the second calibration leak, and the sampling module are connected; One end of the third calibration leak is connected to the sampling module, and the other end of the third calibration leak is connected to the air extraction module.

[0016] For example, the device includes a human-computer interaction module; The human-computer interaction module is electrically connected to the sampling module, the air extraction module, and the mass spectrometry analysis module. The beneficial effects of the technical solution provided by this utility model include at least the following: This application enables the device to switch between static pressure boosting mode, vacuum decay mode, and mass spectrometry leak detection mode by changing the connection relationship between the gas extraction module, sampling module, and mass spectrometry analysis module. It can detect the leakage rate of different types of food packaging bags and different sealing levels, thus solving the problem of difficulty in rapid quantitative testing of food sealing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the integrated multi-mode food packaging bag sealing detection device according to an embodiment of the present invention. Figure 2 A flowchart illustrating the startup process of a device according to an embodiment of the present invention; Figure 3 This is a flowchart of an automatic test of static boost mode according to an embodiment of the present invention; Figure 4 This is a flowchart of an automatic test of vacuum decay mode according to an embodiment of the present invention; Figure 5 This is a flowchart of an automatic test of mass spectrometry leak detection mode according to an embodiment of the present invention; Figure 6This is a flowchart illustrating the shutdown process of a device according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the human-computer interaction interface structure according to an embodiment of the present invention.

[0019] The reference numerals in the figure are respectively: 1. First testing chamber; 11. Sealed door; 12. First vacuum gauge; 13. Second vacuum gauge; 2. Second testing chamber; 21. Third vacuum gauge; 22. Quadruple mass spectrometer; 31. First dry pump; 32. First molecular pump; 33. Second dry pump; 34. Second molecular pump; 41. First valve; 42. Second valve; 43. Third valve; 44. Fourth valve; 45. Fifth valve; 46. Sixth valve; 47. Seventh valve; 48. Eighth valve; 49. Ninth valve; 410. Tenth valve; 51. First calibration leak; 52. Second calibration leak; 53. Third calibration leak.

[0020] The accompanying drawings have illustrated specific embodiments of the present invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] Before further describing the embodiments of this utility model in detail, the directional terms involved in the embodiments of this utility model, such as "upper part," "lower part," and "side part," are used to refer to... Figure 1 The orientation shown is a reference and does not limit the scope of protection of this utility model.

[0023] To make the technical solution and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0024] This application provides an integrated multi-mode food packaging bag seal detection device, such as... Figure 1As shown, the device includes: a gas extraction module, a sampling module, and a mass spectrometry analysis module; the sample to be tested is placed in the sampling module; the sampling module and the mass spectrometry analysis module are connectable and disconnectable, and the gas extraction module is connectable and disconnectable to both the sampling module and the mass spectrometry analysis module; by adjusting the connection between the gas extraction module, the sampling module, and the mass spectrometry analysis module, the device can detect the leak rate of the sample to be tested in static pressure boosting mode, vacuum decay mode, or mass spectrometry leak detection mode. This application, by changing the connection relationship between the gas extraction module, the sampling module, and the mass spectrometry analysis module, can realize the switching between static pressure boosting mode, vacuum decay mode, and mass spectrometry leak detection mode, enabling leak rate detection of different types of food packaging bags and different sealing levels, solving the problem of difficulty in rapid quantitative testing of food sealing. The pressure measurement range in static pressure boosting mode is 1×10⁻⁶. 5 Pa ~ 1×10 -3 Pa, the pressure measurement range in mass spectrometry leak detection mode is 1×10 Pa. -3 Pa~5×10 -4 Pa.

[0025] In one embodiment, see Figures 3 to 5 As shown, when the device operates in static boost mode, the pumping module and the sampling module are connected, and the pumping module evacuates the sampling module. The device performs leak rate detection on the sealing performance of the sample under the first vacuum condition. When the device operates in vacuum decay mode, the pumping module and the sampling module are connected, and the pumping module evacuates the sampling module. The device performs leak rate detection on the sealing performance of the sample under the second vacuum condition. When the device operates in mass spectrometry leak detection mode, the pumping module is connected to both the sampling module and the mass spectrometry analysis module, and the sampling module is connected to the mass spectrometry analysis module. The pumping module evacuates both the sampling module and the mass spectrometry analysis module. The device performs leak rate detection on the sealing performance of the sample under the third vacuum condition.

[0026] In one embodiment, the first vacuum condition is less than or equal to 0.5 Pa, the second vacuum condition is less than or equal to 40,000 Pa, and the third vacuum condition is less than or equal to 0.01 Pa. This system can efficiently, sensitively, and accurately detect leak rates in different types of food packaging bags with varying sealing levels, and has broad application prospects.

[0027] In one embodiment, such as Figure 1As shown, the sampling module includes a first detection chamber 1, a first vacuum gauge 12, and a second vacuum gauge 13. The first vacuum gauge 12 and the second vacuum gauge 13 are mounted on the first detection chamber 1 and are used to detect the vacuum level within the first detection chamber 1. The first vacuum gauge 12 and the second vacuum gauge 13 have different measuring ranges. The first detection chamber 1 is connected to both the evacuation module and the mass spectrometry analysis module. When the device is tested in static pressure boosting mode, the vacuum level within the first detection chamber 1 meets the first vacuum condition; when the device is tested in vacuum decay mode, the vacuum level within the first detection chamber 1 meets the second vacuum condition; and when the device is tested in mass spectrometry leak detection mode, the vacuum level within the first detection chamber 1 meets the third vacuum condition.

[0028] In one embodiment, such as Figure 1 As shown, the sampling module also includes a vent pipe, which is connected to the atmosphere via a valve. (See attached image.) Figures 3 to 5 As shown, after the test reading is completed in any test mode, the air pressure in the first test chamber 1 is restored to atmospheric pressure through the vent pipe.

[0029] In one embodiment, such as Figure 1 As shown, the first vacuum gauge 12 is a low-vacuum diaphragm gauge, and the second vacuum gauge 13 is a high-vacuum diaphragm gauge. The first vacuum gauge 12 and the second vacuum gauge 13 are installed through the side wall of the first detection chamber 1, with their detection ends extending into the first detection chamber 1. The low-vacuum diaphragm gauge is used to measure changes within a higher pressure range, while the high-vacuum diaphragm gauge focuses on monitoring lower pressure ranges. This allows the device to perform accurate measurements over a wide pressure range, suitable for various applications requiring monitoring from vacuum to high pressure. The first detection chamber 1 has an opening, and a sealing door 11 is located at the opening. A cylinder driving the sealing door 11 is fixed to the outside of the first detection chamber 1, and its actuator is connected to the sealing door 11. A switch sensor is also provided at the sealing door 11 to detect whether the sealing door 11 of the first detection chamber 1 is fully closed.

[0030] In one embodiment, the internal dimensions of the first detection chamber 1 are 350mm×255mm×200mm, which can simultaneously perform leak rate detection on four packaging bags with a size of 200×150mm.

[0031] In one embodiment, such as Figure 1 As shown, the mass spectrometry analysis module includes a second detection chamber 2, a third vacuum gauge 21, and a quadrupole mass spectrometer; the third vacuum gauge 21 is installed on the second detection chamber 2 and is used to detect the vacuum level in the second detection chamber 2; the quadrupole mass spectrometer is connected to the second detection chamber 2; the second detection chamber 2 is connected to the sampling module and the gas extraction module respectively.

[0032] In one embodiment, such as Figure 1As shown, the second detection chamber 2 is a mass spectrometry detection chamber. The third vacuum gauge 21 is a high vacuum gauge, which is installed through the side wall of the second detection chamber 2, with its detection end extending into the second detection chamber 2. The quadrupole mass spectrometer is connected to the second detection chamber 2, and the second detection chamber 2 and the first detection chamber 1 of the sampling module are connected by a pipeline. The second detection chamber 2 and the first detection chamber 1 are connected by a pipeline with a valve to allow for on / off connection between the two chambers. Gas in the first detection chamber 1 enters the second detection chamber 2 through the pipeline, and the mass spectrometry analysis module is used to analyze the gas composition in the first detection chamber 1. The second detection chamber 2 is made of 316 stainless steel, and the baking temperature is 80~150℃. At a sampling pressure of 10... 5 ~5×10 -2 At a pressure of Pa, the third vacuum gauge 21 can detect a vacuum level of ≤5×10⁻⁶ in the second detection chamber 2. - 4 Pa.

[0033] In one embodiment, such as Figure 1 As shown, the gas extraction module includes a first molecular pump 32, a second molecular pump 34, a first dry pump 31, and a second dry pump 33; the first molecular pump 32 and the first dry pump 31 are respectively connected to the sampling module, and the first molecular pump 32 and the first dry pump 31 are connected; the second molecular pump 34 and the second dry pump 33 are connected in series, and the second molecular pump 34 is connected to the mass spectrometry analysis module; the second molecular pump 34 and the second dry pump 33 are respectively connected to the sampling module.

[0034] In one embodiment, such as Figure 1 As shown, the first molecular pump 32 is connected to the first detection chamber 1, and the connection between the first molecular pump 32 and the first detection chamber 1 is controlled by the second valve 42. The first dry pump 31 is connected to the first detection chamber 1, and the connection between the first dry pump 31 and the first detection chamber 1 is controlled by the fourth valve 44. The connection between the first molecular pump 32 and the first dry pump 31 is controlled by the third valve 43. The connection between the second molecular pump 34 and the first detection chamber 1 is controlled by the fifth valve 45, and the connection between the second dry pump 33 and the first detection chamber 1 is controlled by the first valve 41. The connection between the first detection chamber 1 and the second detection chamber 2 is controlled by the sixth valve 46. A seventh valve 47 is provided on the vent pipe between the first detection chamber 1 and the atmosphere, and the connection between the first detection chamber 1 and the atmosphere is controlled by the seventh valve 47. Preferably, the first valve 41, the second valve 42, the third valve 43, the fourth valve 44, the fifth valve 45, the sixth valve 46, and the seventh valve 47 are all solenoid valves.

[0035] In one embodiment, the first dry pump 31 is a diaphragm pump. The second molecular pump 34 is a split-flow molecular pump.

[0036] In one embodiment, the first molecular pump 32, the second molecular pump 34, the first dry pump 31, and the second dry pump 33 are activated as needed to evacuate the first detection chamber 1 and the second detection chamber 2. These pumps have a pumping speed adjustment function and are used to introduce the molecular flow gas sample from the first detection chamber 1 into the second detection chamber 2, minimizing additional collisions of gas molecules during sampling and maintaining the required vacuum level in both chambers. The evacuation module includes a dry pump unit and valve pipelines. The molecular pump in the dry pump unit serves as the main pump, and the forestage pump is a dry pump. The entire evacuation module is clean and oil-free, avoiding contamination of the device and achieving a vacuum level of 10. -3 The ultimate vacuum level is below Pa. The second detection chamber 2 must be evacuated before the entire packaging process to prevent airborne impurities from contaminating the components. The entire device requires rigorous cleaning and baking before evacuation.

[0037] In one embodiment, such as Figure 1 As shown, the device also includes a leak rate calibration module; the leak rate calibration module includes a first calibration leak hole 51, a second calibration leak hole 52 and a third calibration leak hole 53; the first calibration leak hole 51 and the second calibration leak hole 52 are connected to the sampling module; one end of the third calibration leak hole 53 is connected to the sampling module and the other end of the third calibration leak hole 53 is connected to the air extraction module.

[0038] In one embodiment, the first calibration leak 51, the second calibration leak 52, and the third calibration leak 53 have different leakage rates. The first calibration leak 51 is connected to the first detection chamber 1, and the connection between the first calibration leak 51 and the first detection chamber 1 is controlled by the ninth valve 49. The second standard leak is connected to the first detection chamber 1, and the connection between the second standard leak and the first detection chamber 1 is controlled by the tenth valve 410. One end of the third calibration leak 53 is connected to the first detection chamber 1, and the connection between the third calibration leak 53 and the first detection chamber 1 is controlled by the eighth valve 48. The other end of the third calibration leak 53 is connected to the connecting pipeline between the fourth valve 44 and the first dry pump 31. This application uses a leak rate calibration module to calibrate the leak rate of the device at multiple levels to ensure that the device maintains good accuracy and reliability throughout its entire operating cycle. The eighth valve 48, the ninth valve 49, and the tenth valve 410 are all solenoid valves.

[0039] In one embodiment, the device uses a comparative method to detect the sealing performance of the sample under test in three modes. For example, it compares the leakage flow rate of the food packaging bag under test, measured by a quadrupole mass spectrometer, with the gas flow rate of a standard leak hole to calculate the leakage rate of the food packaging bag under test. The gas flow rate of the standard leak holes has been pre-tested. The standard leak holes are the first calibration leak hole 51, the second calibration leak hole 52, and the third calibration leak hole 53.

[0040] In one embodiment, this device can also perform calibration of a quadrupole mass spectrometer: 1) Turn on the quadrupole mass spectrometer. After the warm-up time is reached, the quadrupole mass spectrometer will self-calibrate. 2) Connect the third calibration leak 53 (a traceable standard leak with a leak rate value close to the value being calibrated, the leak rate value being the Q standard leak calibration value) to the first detection chamber 1. After the value stabilizes, record the quadrupole mass spectrometer ion current reading I and convert it to the leak rate. ; 3) Record the leakage rate value of the third calibration leak hole 53; 4) Adjust the quadrupole mass spectrometer parameters based on the measurement results.

[0041] In one embodiment, the device includes a human-computer interaction module; the human-computer interaction module is electrically connected to the sampling module, the gas extraction module, and the mass spectrometry analysis module.

[0042] In one embodiment, the human-computer interaction interface of the human-computer interaction module is as follows: Figure 7 As shown, the human-machine interface module implements functions including test mode selection, data acquisition and processing, and human-machine interaction. The test mode selection function enables automatic equipment control according to optimal logic based on the selected test mode. Data acquisition and processing collects and processes data from various vacuum sensors (first vacuum gauge 12, second vacuum gauge 13, third vacuum gauge 21), pressure sensors (switch sensors), quadrupole mass spectrometer, etc., via communication protocols. The human-machine interface displays the operating status of each module and collects vacuum and leak rate values ​​accurately and promptly according to experimental requirements. These values ​​are then analyzed and calculated by the host computer software to automatically generate reports. The human-machine interface module also controls the start and stop of various valves, molecular pumps, and dry pumps. Throughout the entire packaging bag leak rate test process, the device of this application does not require manual operation or recording. Only the corresponding parameters need to be set on the human-machine interface to complete the background test, system calibration, and packaging bag leak rate test functions, improving detection efficiency. In this application's food packaging bag sealing detection device, the host computer software judges the detection results based on a pre-set pass / fail threshold during the detection process. The detection results are divided into two types: those with a leakage rate below the pass / fail threshold are considered passable, and those with a leakage rate above the pass / fail threshold are considered failable. The detection results are transmitted from the data acquisition and processing module to the human-machine interface, ultimately providing corresponding pass / fail signals and audible alarms. When the leakage rate of a batch of packaging bags approaches the pass / fail threshold, or when the difference or ratio between the leakage rate of several consecutive batches of packaging bags and the pass / fail threshold is less than the preset detection threshold, it indicates that the device or the product under test has deviated from its normal state. The detection operation needs to be stopped, and the operating status of the device and the product status needs to be analyzed and confirmed to promptly identify abnormalities. If necessary, the device should be calibrated and the detection repeated.

[0043] In one embodiment, the human-computer interaction module adjusts and sets the operating parameters before conducting the test, thereby pre-setting the operating parameters to achieve the purpose of automatic testing during the test.

[0044] To ensure accuracy and sensitivity, the sealed food packaging bags are first placed in a pressurized container filled with helium to test their airtightness. If the packaging bag does not have micropores or easily perforated weak points, helium will not enter the bag. If the packaging bag has micropores or easily perforated weak points, helium will enter the bag under external pressure, becoming a tracer gas, or a marker gas for leak detection.

[0045] This embodiment integrates three different leak detection technologies: static pressure boosting, vacuum attenuation, and mass spectrometry leak detection. These three methods differ in principle, operation, and applicable scope.

[0046] The static pressure boosting method works by introducing a test gas (such as dry air or inert gas) at a certain pressure into a sealed system or container, then isolating and monitoring the pressure changes over a period of time to determine if a leak exists. It is suitable for detecting minute leaks, is relatively simple to operate, and requires no special equipment. Its limitations include the inability to precisely locate the leak point, and temperature changes may affect the accuracy of the results. It is suitable for testing the airtightness of vacuum-sealed food packaging.

[0047] In this embodiment, when the device is operating in static boost mode, the first dry pump 31 is connected to the sampling module, and the first dry pump 31 evacuates the sampling module to a fourth vacuum condition; the first dry pump 31 is disconnected from the sampling module, the first dry pump 31 and the first molecular pump 32 are connected in series, the first molecular pump 32 is connected to the sampling module, and the first dry pump 31 and the first molecular pump 32 evacuate the sampling module to a first vacuum condition; the first molecular pump 32 is disconnected from the sampling module, and the device performs leak rate detection on the sealing performance of the sample to be tested under the first vacuum condition of the sampling module.

[0048] The test logic of the static pressure boosting mode in this embodiment is as follows: the packaging bag to be tested is placed in the first detection chamber 1, the first molecular pump 32 and the first dry pump 31 are turned on to draw a vacuum, the second valve 42 and the fourth valve 44 are closed, the gas leaking from the packaging bag to be tested enters the first detection chamber 1, causing the pressure in the first detection chamber 1 to rise. The leaking gas is detected by the low vacuum diaphragm gauge and the high vacuum diaphragm gauge, and the leakage rate of the packaging bag is calculated.

[0049] Specifically, in one particular embodiment, such as Figure 3 As shown, when the device is operating in static boost mode, the working process is as follows: 1) In response to the user's start command, open the sealed door 11 on the first detection chamber 1; 2) Place the package to be tested into the container and close the sealed door 11 on the first testing chamber 1; 3) Determine whether the sealing door 11 is closed properly based on the feedback information from the switch sensor. If it is determined that the sealing door 11 is not closed properly, wait until the sealing door 11 is closed properly. If it is determined that the sealing door 11 is closed properly, proceed to the next step. 4) Control the start of the first dry pump 31, open the fourth valve 44 and the third valve 43. At this time, the first dry pump 31 is connected to the first detection chamber 1 of the sampling module; at this time, the third valve 43 is pre-opened, and the first molecular pump 32 is not working. 5) After a preset delay (e.g., one minute), the first molecular pump 32 starts. At this time, the first molecular pump 32 is connected to the first dry pump 31, and the first molecular pump 32 is disconnected from the first detection chamber 1. The first molecular pump 32 is in pre-start mode and does not participate in the vacuuming of the first detection chamber 1. 6) Determine whether the vacuum level in the first detection chamber 1 meets the fourth vacuum condition based on the feedback information from the first vacuum gauge 12. For example, the fourth vacuum condition is less than 100 Pa. If it does not meet the condition, continue to wait for vacuuming. If it meets the condition, proceed to the next step. 7) Control the opening of the second valve 42 and the closing of the fourth valve 44. At this time, the first dry pump 31 and the first detection chamber 1 are disconnected, the first dry pump 31 and the first molecular pump 32 are connected, and the first molecular pump 32 and the first detection chamber 1 are connected. The first detection chamber 1 is evacuated by the first dry pump 31 and the first molecular pump 32 working in series and simultaneously. 8) Determine whether the vacuum level in the first detection chamber 1 meets the first vacuum condition based on the feedback information from the first vacuum gauge 12. For example, the first vacuum condition is less than or equal to 0.5 Pa. If it does not meet the condition, continue to wait for vacuuming. If it meets the condition, proceed to the next step. 9) Control the closure of the second valve 42; 10) Within the preset timing duration dt, obtain the initial and final readings P11 and P12 of the preset timing duration dt, calculate the pressure difference dp1 between P11 and P12, calculate the leakage rate Lv1 of the packaging bag to be tested based on the preset leakage rate algorithm, and display the test results on the human-machine interface. 11) Control the first dry pump 31 and the first molecular pump 32 to stop; 12) Control the opening of the seventh valve 47; 13) Determine whether the vacuum level in the first detection chamber 1 meets the atmospheric pressure range based on the feedback information from the first vacuum gauge 12. If it does not meet the range, continue to wait; if it does meet the range, proceed to the next step. 14) Control the opening of the sealing door 11 to complete one leak detection.

[0050] In one embodiment, the vacuum decay method works by placing the object under test in a vacuum atmosphere or creating a vacuum inside the object, and detecting leaks by monitoring changes in the vacuum level over time. If a leak occurs, the entry of external gas causes the vacuum level to decrease. This method is suitable for detecting highly sensitive leaks, provides quantitative information on the leak rate, and is generally more sensitive than the static pressure boosting method. It is suitable for testing the airtightness of specialized food packaging with gas-filled seals.

[0051] In this embodiment, when the device is operating in vacuum decay mode, the first dry pump 31 is connected to the sampling module, and the first dry pump 31 evacuates the sampling module to a second vacuum condition; when the first dry pump 31 is disconnected from the sampling module, the device performs leak rate detection on the sealing performance of the sample to be tested under the second vacuum condition of the sampling module.

[0052] In this embodiment, the test logic of the vacuum decay method is as follows: the packaging bag to be tested is placed in the first detection chamber 1, the first molecular pump 32 and the first dry pump 31 are turned on to evacuate the first detection chamber 1 to below 40000Pa, the second valve 42 and the fourth valve 44 are closed, the gas leaking from the packaging bag to be tested enters the first detection chamber 1, causing the pressure in the first detection chamber 1 to rise, the vacuum degree of the first detection chamber 1 is detected by a low vacuum diaphragm gauge, and the leakage rate of the packaging bag is calculated.

[0053] In a specific embodiment, such as Figure 4 As shown, when the device is operating in vacuum decay mode, the working process is as follows: 1) In response to the user's start command, open the sealed door 11 on the first detection chamber 1; 2) Place the package to be tested into the container and close the sealed door 11 on the first testing chamber 1; 3) Determine whether the sealing door 11 is closed properly based on the feedback information from the switch sensor. If it is determined that the sealing door 11 is not closed properly, wait until the sealing door 11 is closed properly. If it is determined that the sealing door 11 is closed properly, proceed to the next step. 4) Control the start of the first dry pump 31 and open the fourth valve 44. At this time, the first dry pump 31 is connected to the first detection chamber 1 of the sampling module; 5) Determine whether the vacuum level in the first detection chamber 1 meets the second vacuum condition based on the feedback information from the first vacuum gauge 12. For example, the second vacuum condition is less than or equal to 40000Pa. If it does not meet the condition, continue to wait for vacuuming. If it meets the condition, proceed to the next step. 6) Control the closure of the fourth valve 44; 7) Within the preset timing duration dt, accurately record the readings P21 and P22 of the first vacuum gauge 12 at the beginning and end of the preset timing duration dt. Calculate the pressure difference dp2 between the two based on P21 and P22. Calculate the leakage rate Lv2 of the packaging bag to be tested based on the preset leakage rate algorithm, and display the test results on the human-machine interface. 8) Stop the first dry pump 31; 9) Control the opening of the seventh valve 47; 10) Determine whether the vacuum level in the first detection chamber 1 meets the atmospheric pressure range based on the feedback information from the first vacuum gauge 12. If it does not meet the range, continue to wait; if it does meet the range, proceed to the next step. 11) Control the opening of the sealing door 11 to complete one leak detection.

[0054] In one embodiment, the principle of mass spectrometry leak detection is as follows: a mass spectrometer is used to analyze a specific tracer gas (such as helium). When a system containing the tracer gas leaks, the mass spectrometer can detect the tracer gas escaping from the system and determine the presence and location of the leak based on the signal intensity. Its advantages include very high sensitivity, the ability to accurately locate leak points, and its suitability for detecting minute leaks.

[0055] In this embodiment, when the device is operating in mass spectrometry leak detection mode, the first dry pump 31 is connected to the sampling module, and the first dry pump 31 evacuates the sampling module to the fifth vacuum condition; the second dry pump 33 is connected to the sampling module, and the first dry pump 31 and the second dry pump 33 evacuate the sampling module to the sixth vacuum condition; the first dry pump 31 and the second dry pump 33 are both disconnected from the sampling module, the first dry pump 31 and the first molecular pump 32 are connected in series, the second dry pump 33 and the second molecular pump 34 are connected in series, the first molecular pump 32 and the second molecular pump 34 are respectively connected to the sampling module, the second molecular pump 34 is connected to the mass spectrometry molecular module, and the first dry pump 31, the first molecular pump 32, the second dry pump 33 and the second molecular pump 34 evacuate the sampling module to the third vacuum condition; the first molecular pump 32 and the second molecular pump 34 are both disconnected from the sampling module, the sampling module is connected to the mass spectrometry analysis module, and the device performs leak rate detection on the sealing of the sample under the third vacuum condition of the sampling module.

[0056] In this embodiment, the test logic of the mass spectrometry leak detection mode is as follows: the packaging bag to be tested filled with helium gas is placed in the first detection chamber 1, the first molecular pump 32, the second molecular pump 34, the first dry pump 31 and the second dry pump 33 are turned on to evacuate the first detection chamber 1, the sixth valve 46 is opened to introduce the leaked gas from the packaging bag to be tested into the second detection chamber 2, the leaked helium gas is detected by a quadrupole mass spectrometer, and the leakage rate of the packaging bag is calculated.

[0057] In a specific embodiment, such as Figure 5As shown, when the device is operating in mass spectrometry leak detection mode, the working process is as follows: 1) In response to the user's start command, open the sealed door 11 on the first detection chamber 1; 2) Place the package to be tested into the container and close the sealed door 11 on the first testing chamber 1; 3) Determine whether the sealing door 11 is closed properly based on the feedback information from the switch sensor. If it is determined that the sealing door 11 is not closed properly, wait until the sealing door 11 is closed properly. If it is determined that the sealing door 11 is closed properly, proceed to the next step. 4) Control the start of the first dry pump 31 and the second dry pump 33, open the third valve 43 and the fourth valve 44. At this time, the first dry pump 31 is connected to the first detection chamber 1 of the sampling module, the second molecular pump 34 is connected to the second dry pump 33, the first molecular pump 32 is connected to the first dry pump 31, only the first dry pump 31 evacuates the first detection chamber 1, the second dry pump 33 is in pre-start, the second dry pump 33 evacuates the second detection chamber 2; 5) After a preset delay (e.g., one minute), the first molecular pump 32 and the second molecular pump 34 are started. At this time, the second molecular pump 34 and the second dry pump 33 simultaneously evacuate the second detection chamber 2, while the first dry pump 31 evacuates the first detection chamber 1. The first molecular pump 32 is in pre-start mode. 6) Determine whether the vacuum level in the first detection chamber 1 meets the fifth vacuum condition based on the feedback information from the first vacuum gauge 12. For example, the fifth vacuum condition is less than or equal to 100 Pa and greater than 0.5 Pa. If it does not meet the condition, continue to wait for vacuuming. If it meets the condition, proceed to the next step. 7) Control the opening of the first valve 41. At this time, the second dry pump 33 is connected to the first detection chamber 1, and the first dry pump 31 and the second dry pump 33 simultaneously evacuate the first detection chamber 1. 8) Determine whether the vacuum level in the first detection chamber 1 meets the sixth vacuum condition based on the feedback information from the first vacuum gauge 12. For example, the sixth vacuum condition is less than or equal to 0.5 Pa and greater than 0.01 Pa. If it does not meet the condition, continue to wait for vacuuming. If it meets the condition, proceed to the next step. 9) Control the opening of the second valve 42 and the fifth valve 45, and close the first valve 41 and the fourth valve 44. At this time, the first dry pump 31 and the first molecular pump 32 are connected in series, and the second molecular pump 34 and the second dry pump 33 are connected in series. The first dry pump 31, the first molecular pump 32, the second molecular pump 34, and the second dry pump 33 evacuate the first detection chamber 1, and the second molecular pump 34 and the second dry pump 33 maintain the vacuum level in the second detection chamber 2. 10) Determine whether the vacuum level in the first detection chamber 1 meets the third vacuum condition based on the feedback information from the first vacuum gauge 12. For example, the third vacuum condition is less than or equal to 0.01 Pa. If it does not meet the condition, continue to wait for vacuuming. If it meets the condition, proceed to the next step. 11) Control the opening of the sixth valve 46, control the closing of the second valve 42 and the fifth valve 45, and the gas in the first detection chamber 1 enters the second detection chamber 2; 12) Control the fourth-stage mass spectrometer 22 to detect the gas in the second detection chamber 2, read the ion current of the fourth-stage mass spectrometer 22, calculate the leakage rate Lv3 of the packaging bag to be tested based on the ion current of the fourth-stage mass spectrometer 22 according to the pre-set leakage rate algorithm, and display the detection results on the human-machine interface. 13) Control the closure of the sixth valve 46; 14) Control the first dry pump 31, the first molecular pump 32, the second dry pump 33, and the second molecular pump 34 to stop; 15) Control the opening of the seventh valve 47; 16) Determine whether the vacuum level in the first detection chamber 1 meets the atmospheric pressure range based on the feedback information from the first vacuum gauge 12. If it does not meet the range, continue to wait. If it does meet the range, proceed to the next step. 17) Control the opening of the sealing door 11 to complete one leak detection.

[0058] When the device is operating in mass spectrometry leak detection mode, step 5) of the working process also includes detecting whether the rotation speed of the second molecular pump 34 is normal. When it is determined that the rotation speed of the second molecular pump 34 is abnormal, wait until it is determined that the rotation speed of the second molecular pump 34 is normal, and then control the opening of the third vacuum gauge 21.

[0059] In this embodiment, an integrated touchscreen industrial control computer is used, which is installed externally. The integrated touchscreen industrial control computer inputs control parameters and outputs signals to the PLC. After receiving the signals, the PLC classifies and processes the information transmitted by the signals, and transmits the signals to the molecular pump, dry pump, vacuum gauge, four-stage mass spectrometer 22, and each valve respectively, so that they perform corresponding actions.

[0060] The integrated touchscreen industrial computer displays the working status of each component on the human-machine interface. In manual mode, components can be operated independently by clicking their icons. In automatic mode, different test mode buttons can be clicked to enter the corresponding test state.

[0061] In test mode, a flowchart of the corresponding test pops up on the human-computer interaction interface, with the currently executing step highlighted. After the test is completed, the software automatically calculates and outputs the test data.

[0062] The human-machine interface in the mass spectrometry leak detection mode is used to set the parameters of the fourth-stage mass spectrometer 22 and display its current status and data. In leak detection mode, test data will be directly retrieved from the human-machine interface, automatically initiating the leak detection test. The operator's operation process and the final and process data are recorded in an Excel spreadsheet and automatically saved, providing a function for reviewing past data.

[0063] In this embodiment, the main interface includes the following settings options: (a) Select the leak detection mode: namely, static boost mode, vacuum decay mode, and mass spectrometer test mode; (b) Choose whether to conduct a baseline test; (c) Select whether to perform system calibration; (e) Parameter setting interface, manually enter the preset standard leakage rate value.

[0064] In this embodiment, the device startup process is as follows: Figure 2 As shown, in response to the start command, all devices power on and perform self-tests to determine if they are functioning correctly. If all devices are functioning correctly, the device starts and displays the human-machine interface, allowing subsequent operations to begin. If a device malfunction is detected, a prompt is given, and the operator determines whether it is a critical fault. If a critical fault is detected, the device is shut down; if a non-critical fault is detected, the user handles it. If the user's handling result indicates that the non-critical fault is ignored, the device starts and displays the human-machine interface, allowing subsequent operations to begin; if the user's handling result does not indicate that the non-critical fault is ignored, the device is shut down.

[0065] In this embodiment, the shutdown procedure of the device is as follows: Figure 6 As shown, in response to the vacuum shutdown command, the third vacuum gauge 21 is closed, all valves except the third valve 43 are closed, and the first molecular pump 32 and the second molecular pump 34 are stopped. It is confirmed that the first molecular pump 32 and the second molecular pump 34 have stopped. If they have not stopped, wait until they have both stopped, then close the third valve 43, and then shut down the first dry pump 31 and the second dry pump 33. The shutdown is then complete.

[0066] According to the technical specifications of general food packaging bags, the leak detection pressure range for food packaging bags is 1×10⁻⁶. 5 Pa~5×10 - 3With a pressure range spanning eight orders of magnitude, the food packaging bag sealing detection device of this application can implement three detection methods: static pressure boosting, vacuum attenuation, and mass spectrometry leak detection. It achieves functions such as automated multi-stage differential pressure sampling, quantitative analysis of outgassing components, automatic leak rate calibration, and detection mode switching. It can efficiently and accurately complete the comprehensive leak rate detection of ordinary dry packaging and packaging of food and medicine containing water (slurry). It is suitable for leak detection of different sealing levels and has broad application prospects.

[0067] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0068] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0069] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An integrated multi-mode food packaging bag sealing detection device, characterized in that, include: Gas extraction module, sampling module, mass spectrometry analysis module; The sample to be tested is placed in the sampling module; The sampling module and the mass spectrometry analysis module are connected in a switchable manner, and the gas extraction module is connected in a switchable manner to both the sampling module and the mass spectrometry analysis module. By adjusting the on / off states between the pumping module, the sampling module, and the mass spectrometry analysis module, the device can detect the leak rate of the sample under test in either static pressure boosting mode, vacuum decay mode, or mass spectrometry leak detection mode.

2. The integrated multi-mode food packaging bag sealing detection device according to claim 1, characterized in that, When the device is operating in static boost mode, the vacuum module and the sampling module are connected. The vacuum module evacuates the sampling module, and the device performs leak rate detection on the sealing performance of the sample under the first vacuum condition of the sampling module. When the device is operating in vacuum decay mode, the pumping module and the sampling module are connected. The pumping module evacuates the sampling module, and the device performs leak rate detection on the sealing performance of the sample under the second vacuum condition of the sampling module. When the device is operating in mass spectrometry leak detection mode, the gas extraction module is connected to the sampling module and the mass spectrometry analysis module respectively. The sampling module is connected to the mass spectrometry analysis module. The gas extraction module evacuates the sampling module and the mass spectrometry analysis module. The device performs leak rate detection on the sealing of the sample under the third vacuum condition of the sampling module.

3. The integrated multi-mode food packaging bag sealing detection device according to claim 1, characterized in that, The sampling module includes a first detection chamber, a first vacuum gauge, and a second vacuum gauge; The first vacuum gauge and the second vacuum gauge are mounted on the first detection chamber and are used to detect the vacuum level inside the first detection chamber; The first vacuum gauge and the second vacuum gauge have different measuring ranges; The first detection chamber is connected to the gas extraction module and the mass spectrometry analysis module, respectively.

4. The integrated multi-mode food packaging bag sealing detection device according to claim 1, characterized in that, The mass spectrometry analysis module includes a second detection chamber, a third vacuum gauge, and a quadrupole mass spectrometer; The third vacuum gauge is installed on the second detection chamber and is used to detect the vacuum level inside the second detection chamber; The quadrupole mass spectrometer is connected to the second detection chamber; The second detection chamber is connected to the sampling module and the air extraction module, respectively.

5. An integrated multi-mode food packaging bag sealing detection device according to any one of claims 1 to 4, characterized in that, The pumping module includes a first molecular pump, a second molecular pump, a first dry pump, and a second dry pump. The first molecular pump and the first dry pump are respectively connected to the sampling module, and the first molecular pump and the first dry pump are connected together. The second molecular pump and the second dry pump are connected in series, and the second molecular pump is connected to the mass spectrometry analysis module; The second molecular pump and the second dry pump are respectively connected to the sampling module.

6. The integrated multi-mode food packaging bag sealing detection device according to claim 5, characterized in that, When the device is operating in static boost mode, the first dry pump and the sampling module are connected, and the first dry pump evacuates the sampling module to the fourth vacuum condition. The first dry pump is disconnected from the sampling module, the first dry pump and the first molecular pump are connected in series, the first molecular pump and the sampling module are connected, and the first dry pump and the first molecular pump evacuate the sampling module to a first vacuum condition. The first molecular pump and the sampling module are disconnected, and the device performs leak rate detection on the sealing of the sample under the first vacuum condition of the sampling module.

7. The integrated multi-mode food packaging bag sealing detection device according to claim 5, characterized in that, When the device is operating in vacuum decay mode, the first dry pump and the sampling module are connected, and the first dry pump evacuates the sampling module to the second vacuum condition. The first dry pump and the sampling module are disconnected, and the device performs leak rate detection on the sealing of the sample under the second vacuum condition of the sampling module.

8. The integrated multi-mode food packaging bag sealing detection device according to claim 5, characterized in that, When the device is operating in mass spectrometry leak detection mode, the first dry pump and the sampling module are connected, and the first dry pump evacuates the sampling module to the fifth vacuum condition. The second dry pump is connected to the sampling module, and the first dry pump and the second dry pump evacuate the sampling module to the sixth vacuum condition; Both the first dry pump and the second dry pump are disconnected from the sampling module. The first dry pump and the first molecular pump are connected in series. The second dry pump and the second molecular pump are connected in series. The first molecular pump and the second molecular pump are respectively connected to the sampling module. The second molecular pump is connected to the mass spectrometry molecular module. The first dry pump, the first molecular pump, the second dry pump and the second molecular pump evacuate the sampling module to a third vacuum condition. Both the first molecular pump and the second molecular pump are disconnected from the sampling module, while the sampling module is connected to the mass spectrometry analysis module. The device performs leak rate detection on the sealing of the sample under the third vacuum condition of the sampling module.

9. The integrated multi-mode food packaging bag sealing detection device according to claim 1, characterized in that, The device also includes a leak rate calibration module; The leakage rate calibration module includes a first calibration leak hole, a second calibration leak hole, and a third calibration leak hole; The first calibration leak, the second calibration leak, and the sampling module are connected; One end of the third calibration leak is connected to the sampling module, and the other end of the third calibration leak is connected to the air extraction module.

10. The integrated multi-mode food packaging bag sealing detection device according to claim 1, characterized in that, The device includes a human-computer interaction module; The human-computer interaction module is electrically connected to the sampling module, the air extraction module, and the mass spectrometry analysis module.

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