An ultra-low temperature biaxial tensile gas permeability measuring device and method

Abstract

The application discloses a kind of ultra-low temperature biaxial tensile gas permeability measuring device and method, it is related to detection instrument technical field, including gantry, test cavity unit, clamping unit, two-way tensile load driving unit and ultra-low temperature loading unit, ultra-low temperature loading unit is located in the side of two-way tensile load driving unit, two-way tensile load driving unit is located in the both sides of test cavity unit, test cavity unit is connected with the crossbeam of gantry bottom by bolt, clamping unit is located in the top of test cavity unit.The application uses the above structure of a kind of ultra-low temperature biaxial tensile gas permeability measuring device and method, increase on gas permeability tester to sample biaxial tensile device and the overall cooling equipment of test equipment, cooling is carried out using liquid nitrogen, simulate the low-temperature environment where material is located, evaluate the gas permeability of material under complex conditions, more accurately evaluate the gas permeability of material, improve the application effect and reliability of material.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of detection instruments, in particular to an ultralow-temperature biaxial stretching gas permeability measuring device and method. BACKGROUND

[0002] A gas permeability tester is an instrument for measuring the gas permeability of materials. This instrument is commonly used in the fields of material science, chemical engineering, food packaging, pharmaceutical packaging, etc. It can evaluate the permeability of materials to different gases in order to select appropriate materials for different applications.

[0003] The working principle of the gas permeability tester is to apply a gas pressure difference on both sides of the sample, and then measure the rate of gas permeation. The instrument can use a variety of different gases, such as oxygen, carbon dioxide, nitrogen, etc., in order to evaluate the permeability of the sample to different gases.

[0004] In order to further study the influence of environmental temperature, stress conditions and other factors on the gas permeability of materials, it is necessary to improve the loading capacity of the gas permeability tester to simulate complex environments. SUMMARY

[0005] The purpose of the present application is to provide an ultralow-temperature biaxial stretching gas permeability measuring device and method, which adds a biaxial stretching device for the sample and a whole cooling device for the test equipment on the gas permeability tester. This device can use liquid nitrogen for cooling, simulate the low-temperature environment of the material, and comprehensively evaluate the gas permeability of the material under complex conditions. It can more accurately evaluate the gas permeability of the material and improve the application effect and reliability of the material.

[0006] To achieve the above purpose, the present application provides an ultralow-temperature biaxial stretching gas permeability measuring device and method, which comprises a gantry, a test cavity unit, a clamping unit, a biaxial stretching load driving unit and an ultralow-temperature loading unit. The ultralow-temperature loading unit is located on one side of the biaxial stretching load driving unit, the biaxial stretching load driving unit is located on both sides of the test cavity unit, the test cavity unit is connected to the crossbeam at the bottom of the gantry through bolts, and the clamping unit is located above the test cavity unit.

[0007] Preferably, the test cavity unit comprises a test cavity, an inflation port arranged on one side of the test cavity, a gas tank, a fixed aviation plug arranged on the test cavity, a temperature sensor and a temperature difference sensor connected to the fixed aviation plug.

[0008] Preferably, the clamping unit comprises a first servo motor fixed above the gantry top beam, two groups of actuating shafts arranged below the gantry top beam, and a clamp connected with the actuating shafts, and each group of the actuating shafts is arranged above the test cabin body and comprises four actuating shafts.

[0009] The bidirectional tensile load driving unit comprises a second servo motor, a tension sensor, an actuator and a connecting piece, the second servo motor is arranged in four, and each of the four second servo motors is fixedly arranged on the column of the gantry, the second servo motor is connected with the actuator through a cable, and the actuator is located between the tension sensor and the connecting piece.

[0010] The ultralow-temperature loading unit comprises a liquid nitrogen tank arranged on one side of the gantry and a low-temperature cavity connected with the liquid nitrogen tank.

[0011] The number of the fixed aviation plugs is 4-6.

[0012] The clamp and the test cavity are arranged with a to-be-tested piece, the to-be-tested piece is square in shape, the central part is a permeability measurement area, and the periphery is a clamping area.

[0013] Preferably, the gas tank and the inflation port are connected through an air pipe, the liquid nitrogen tank and the low-temperature cavity are connected through an air pipe, and a valve is arranged on the air pipe.

[0014] An ultralow-temperature biaxial tensile gas permeability measurement method comprises the following steps:

[0015] S1, fixing a to-be-tested piece through a clamping unit;

[0016] S2, applying bidirectional tensile load;

[0017] S3, applying ultralow-temperature load;

[0018] S4, filling test gas;

[0019] S5, collecting test data;

[0020] S6, analyzing material permeability.

[0021] Therefore, the ultralow-temperature biaxial tensile gas permeability measurement device and method have the advantages that the device and method can more accurately evaluate the gas permeability of the material, improve the application effect and reliability of the material, and simulate the low-temperature environment of the material.

[0022] The technical solutions of the present application are described in further detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 FIG. 1 is a structural schematic diagram of an embodiment of a super-low-temperature biaxial tensile gas permeability measuring device of the present application;

[0024] Fig. 2 FIG. 2 is a schematic diagram of a measured member of the measuring device of the embodiment of the super-low-temperature biaxial tensile gas permeability measuring device of the present application;

[0025] Fig. 3 FIG. 3 is an enlarged view of "A" of the measuring device of the embodiment of the super-low-temperature biaxial tensile gas permeability measuring device of the present application;

[0026] REFERENCE NUMERALS

[0027] 1, gantry; 2, test cavity; 3, inflation port; 4, fixed aviation plug; 5, first servo motor; 6, actuating shaft; 7, clamp; 8, second servo motor; 9, tension sensor; 10, connecting member; 11, cable; 12, gas tank; 13, gas pipe; 14, low-temperature cavity; 15, valve; 16, measured member; 17, liquid nitrogen tank. DETAILED DESCRIPTION

[0028] The technical solutions of the present application are described in further detail below with reference to the accompanying drawings and examples.

[0029] Unless otherwise defined, technical or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the terms "first", "second", and the like, used in the present application, do not necessarily have any sequential or chronological significance, but are merely used to distinguish one element from another. The terms "comprises", "comprising", "includes", "including" and the like, are inclusive of the elements listed thereafter and equivalents thereof, and do not preclude other elements or steps. The terms "connected", "coupled", or the like, are not necessarily limited to a physical or mechanical connection or coupling, but also include an electrical connection or coupling, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like, are used for description only and are not intended to limit the relative position of the described objects.

[0030] EMBODIMENT

[0031] As Figs. 1-3As shown, the present application provides a kind of super low temperature biaxial tensile gas permeability measuring device, including portal frame 1, test cavity unit, clamping unit, two-way tensile load driving unit and super low temperature loading unit, super low temperature loading unit is located in the two sides of two-way tensile load driving unit, for realizing the super low temperature environment when sample test.Two-way tensile load driving unit is located in the two sides of test cavity 2 unit, to be measured piece 16 is applied two-way tensile load.Test cavity unit is connected by bolt with the crossbeam of portal frame 1 bottom.Clamping unit is located in the upper of test cavity unit, for fastening to be measured piece 16.

[0032] Test cavity unit includes test cavity 2, inflation port 3 arranged in test cavity 2 side, gas tank 12, fixed aviation plug 4 arranged on test cavity 2, temperature sensor and temperature difference sensor (not shown in figure) connected with fixed aviation plug 4, for containing gas when gas tightness measurement.Inflation port 3 and interface for connecting sensor are left on test cavity 2, for collecting test data.The number of fixed aviation plug 4 is 4-6.Gas tank 12 is connected with inflation port 3 through air pipe 13, valve 15 is arranged on air pipe 13.Gas tank 12 is used to fill test gas in test cavity 2, and the type of gas in gas tank 12 can be selected according to the need of test, such as helium, hydrogen, oxygen and various gases, to test the permeability of different gases.

[0033] Clamping unit includes first servo motor 5 fixed above the crossbeam of portal frame 1 top, two groups of actuating shaft 6 arranged below the crossbeam of portal frame 1 top, clamp 7 connected with actuating shaft 6, two groups of actuating shaft 6 are respectively distributed above test cabin body, each group of actuating shaft 6 is provided with four, total number is 8 (not all shown in figure), clamp 7 and test cavity 2 are placed with to be measured piece 16.First servo motor 5 is used to drive actuating shaft 6 to move downward and clamp to be measured piece 16, there is recess structure corresponding to the shape of clamp 7 above test cavity 2, to be measured piece 16 is clamped and fixed by clamp 7 and test cavity 2 above, before starting first servo motor 5 and making actuating shaft 6 move downward and clamp to be measured piece 16, it needs to smear grease for sealing under the part of to be measured piece 16 in contact with test cavity 2, to ensure the sealing of test cavity 2.

[0034] The bidirectional tensile load driving unit comprises a second servo motor 8, a tension sensor 9, an actuator (not shown in the figure) and a connecting piece 10. The second servo motor 8 is provided with four (not all shown in the figure), and the four second servo motors 8 are fixedly arranged on the column of the gantry 1. The second servo motor 8 is connected with the actuator through a cable 11. The actuator is located between the tension sensor 9 and the connecting piece 10, that is, the connecting piece 10 and the tension sensor 9 are arranged in four groups. Each group of connecting pieces 10 is composed of two steel pipes in a T-shaped structure and is connected through threads. The test piece 16 is formed by turning over the edge and bonding only the outside, forming a channel, so that the steel pipe can be inserted into the gap. When pulling the steel pipe in the vertical direction of the edge of the test piece 16, a uniform tensile stress can be applied to the edge of the test piece 16. In use, first, a steel pipe is inserted into the edge of the test piece 16, and then another steel pipe is connected to form a T-shaped structure. The tail end of the T-shaped structure is connected with the actuator, that is, the actuator is located between the tension sensor 9 and the connecting piece 10.

[0035] The super-low-temperature loading unit comprises a liquid nitrogen tank 17 arranged on one side of the gantry 1 and a low-temperature cavity 14 connected with the liquid nitrogen tank 17. The liquid nitrogen tank 17 and the low-temperature cavity 14 are connected through an air pipe 13. A valve 15 is arranged on the air pipe 13, which can control the start and stop of low-temperature loading. The super-low-temperature loading unit cools the low-temperature cavity 14 by liquid nitrogen cooling, so that the surface of the test piece 16 realizes low-temperature loading of-100 DEG C. (The description of super-low-temperature loading: The actual environment simulated by low-temperature loading is that a sealed air bag is in an external low-temperature environment. In the device, the test cavity 2 can be regarded as the inside of the air bag, and the low-temperature cavity 14 is regarded as the external environment. Therefore, only the low-temperature cavity 14 side needs to reach-100 DEG C. low temperature.)

[0036] The test piece 16 is square in shape, the central part is a permeability measurement area, and the periphery is a clamping area. The center position of the test piece 16 can be connected with other parts, and can be used as a skin-metal piece combination to carry out permeability measurement.

[0037] The application also provides a super-low-temperature bidirectional tensile gas permeability measurement method, which comprises the following steps:

[0038] 1. Fixing the test piece 16 by the clamping unit;

[0039] 2. Applying bidirectional tensile load;

[0040] 3. Applying super-low-temperature load;

[0041] 4. Filling test gas;

[0042] 5. Collecting test data;

[0043] 6. Analyzing material permeability.

[0044] Therefore, this invention provides a cryogenic biaxial tensile gas permeability measurement device and method with the aforementioned structure. The gas permeability tester incorporates a biaxial tensile device for the sample and an overall cooling device for the testing equipment. This device can use liquid nitrogen for cooling, simulating the low-temperature environment of the material, and can comprehensively evaluate the gas permeability performance of the material under complex conditions. Through this device and method, the gas permeability performance of materials can be evaluated more accurately, improving the application effect and reliability of the materials.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A cryogenic biaxial tensile gas permeability measuring device, characterized in that: It includes a gantry frame, a test chamber unit, a clamping unit, a biaxial tensile load driving unit, and an ultra-low temperature loading unit. The ultra-low temperature loading unit is located on one side of the biaxial tensile load driving unit, and the biaxial tensile load driving unit is located on both sides of the test chamber unit. The test chamber unit is connected to the crossbeam at the bottom of the gantry frame by bolts, and the clamping unit is located above the test chamber unit. The test chamber unit includes a test chamber, an air inlet located on one side of the test chamber, an air tank, a fixed aviation plug located on the test chamber, and a temperature sensor and a temperature difference sensor connected to the fixed aviation plug. The bidirectional tensile load drive unit includes a second servo motor, a tension sensor, an actuator, and a connector. There are four second servo motors, all of which are fixedly mounted on the columns of the gantry frame. The second servo motors are connected to the actuators via cables, and the actuators are located between the tension sensor and the connectors. The cryogenic loading unit includes a liquid nitrogen tank disposed on one side of the gantry and a cryogenic cavity connected to the liquid nitrogen tank; The clamping unit includes a clamp, and a test piece is placed between the clamp and the test chamber. The test piece is square in shape, with the central part being the permeability measurement area and the surrounding area being the clamping area.

2. The cryogenic biaxial tensile gas permeability measuring device according to claim 1, characterized in that: The clamping unit includes a first servo motor fixed above the top crossbeam of the gantry, two sets of actuating shafts disposed below the top crossbeam of the gantry, and clamps connected to the actuating shafts. The two sets of actuating shafts are respectively distributed above the test chamber, and each set of actuating shafts is provided with four shafts.

3. The cryogenic biaxial tensile gas permeability measuring device according to claim 2, characterized in that: The gas tank and the gas filling port, as well as the liquid nitrogen tank and the cryogenic cavity, are connected by gas pipes, and valves are installed on the gas pipes.

4. A method for measuring ultra-low temperature biaxial tensile gas permeability as described in any one of claims 1-3, comprising the following steps: S1. Fix the workpiece to be tested using the clamping unit; S2. Apply a bidirectional tensile load; S3. Apply ultra-low temperature load; S4. Introduce the test gas; S5. Collect test data; S6. Analyze the permeability of the material.

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