CN113670807A - Testing device and testing method for anaerobic aging test of rubber material - Google Patents
Testing device and testing method for anaerobic aging test of rubber material Download PDFInfo
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- CN113670807A CN113670807A CN202111136175.1A CN202111136175A CN113670807A CN 113670807 A CN113670807 A CN 113670807A CN 202111136175 A CN202111136175 A CN 202111136175A CN 113670807 A CN113670807 A CN 113670807A
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Abstract
The invention relates to a test device and a test method for an anaerobic aging test of a sizing material, wherein the device comprises a test box provided with a gas path pipeline, a vacuumizing device, an inflating device and a micro-positive pressure monitoring device; the vacuumizing device comprises a vacuum pump communicated with a reversing hand valve, and the reversing hand valve is communicated with the gas path pipeline after being sequentially connected with the switch valve and the three-way connector; the air charging device comprises an air source and a nitrogen sealing valve communicated with the air source, and the nitrogen sealing valve is connected with the reversing hand valve; the micro-positive pressure monitoring device comprises an indication pressure gauge. Compared with the existing method that researchers use self-sealing bagged samples and then vacuumize the samples and put the samples into an aging box for oxygen insulation performance test, the pressure oxygen insulation aging test method established based on the test device solves the problems that the samples are in a negative pressure environment after vacuumization, and micromolecule substances such as anti-aging agents are likely to be separated out to influence the performance test of the samples; the device is simple and easy to operate, the test cost of replacing air by nitrogen is lower, and the oxygen insulation state of the established pressure oxygen insulation aging test method is controllable in the whole process.
Description
Technical Field
The invention belongs to the technical field of material aging performance tests, and particularly relates to a test device and a test method for an anaerobic aging test of a sizing material.
Background
Rubber is subjected to chemical structure destruction under the action of heat or oxygen to generate aging, the heat can promote rubber oxidation, the oxygen can promote rubber degradation, and the influence of aerobic and anaerobic aging on the rubber performance of different vulcanization systems is different according to literature reports. When the tire is used, the outer layer of the tire body is in contact with oxygen in the air, and the hot oxygen autocatalytic aging is carried out in the atmospheric environment; however, the temperature of the tire gradually rises from outside to inside along with the decrease of the oxygen permeation concentration, the aging conditions of the inner layer and the outer layer of the tire are different due to the difference, the outer layer is equivalent to hot air aging, once the inner layer is not supplemented by oxygen consumption, the aging mode is closer to anaerobic aging, and therefore the inner performance and the outer performance of the tire are greatly different.
Based on the aging mechanism and the actual aging process of the tire, different parts of the tire from outside to inside are inspected according to different aging forms. Besides the evaluation of the thermal-oxidative aging performance, the investigation of the near-absolute-oxidative aging performance of the rubber material in the tire should be added so as to be closer to the actual aging form of the inner layer and the outer layer of the tire and simulate the actual aging process of the inner layer and the outer layer of the tire. At present, no manufacturer produces anaerobic aging equipment, and researchers adopt a test method of sealing a sample by a valve bag, vacuumizing the sample and then transferring the valve bag into an aging box to realize the anaerobic performance test, but the method has great defects. The vacuum-pumped test sample is in a negative pressure environment, and micromolecular substances such as an anti-aging agent and the like are likely to be separated out, so that the real performance test of anaerobic aging of the sample is influenced. At present, an experimental device for testing the anaerobic aging performance of sizing materials is needed.
Disclosure of Invention
The invention aims to solve the problems that no anaerobic aging device exists at present, the anaerobic performance test is carried out by vacuumizing in the prior art, a sample is in a negative pressure environment, and micromolecule substances such as an anti-aging agent and the like are separated out to influence the authenticity performance of the sample, and provides a test device and a test method for the rubber material anaerobic aging test.
The technical scheme of the invention is as follows:
a test apparatus for an anaerobic aging test of a compound, comprising:
the test box is provided with a gas path pipeline;
the vacuumizing device comprises a vacuum pump, the vacuum pump is communicated with a reversing hand valve, and the reversing hand valve is communicated with the gas path pipeline after being sequentially connected with a switch valve and a three-way connector;
the inflation device comprises an air source and a nitrogen sealing valve communicated with the air source, the nitrogen sealing valve is connected with a reversing hand valve, and the reversing hand valve is communicated with the air path pipeline after being sequentially connected with a switch valve and a three-way connector;
the micro-positive pressure monitoring device comprises an indication pressure gauge for indicating micro-positive pressure, wherein the indication pressure gauge is arranged between the three-way connector and the gas path pipeline and is communicated with the test box.
Furthermore, a sample rack is arranged in the test box.
Furthermore, one end of the gas path pipeline is fixedly arranged on the test box and communicated with the interior of the box body, and the other end of the gas path pipeline is provided with an external interface of the gas path pipeline; the test box is also provided with a temperature control device; the temperature control device comprises a power switch and a temperature control meter.
Furthermore, a vacuum pump interface is arranged on the reversing hand valve, and the vacuum pump is connected with the vacuum pump interface; the external interface of the gas path pipeline is connected with the three-way interface; the vacuumizing device further comprises a vacuum pressure gauge and a first air circuit switch, and the vacuum pressure gauge and the first air circuit switch are both installed on the box body of the test box.
Further, a pressure regulating valve and a second gas circuit switch are arranged between the gas source and the nitrogen sealing valve; the nitrogen sealing valve is provided with a gas inlet and a gas outlet, the reversing hand valve is provided with a gas interface, the gas source is connected with the gas inlet of the nitrogen sealing valve through a pressure regulating valve and a second gas path switch, and the gas outlet of the nitrogen sealing valve is connected with the gas interface of the reversing hand valve; the gas source is nitrogen or other inert gas with similar property with nitrogen.
Furthermore, the indication pressure gauge is connected with the test box through a three-way interface and an external interface of the air circuit pipeline and is used for indicating the micro-positive pressure state inside the test box.
A test method for an anaerobic aging test of rubber materials adopts the test device and comprises the following steps:
(1) connecting a gas source with a pressure regulating valve, a second gas circuit switch and a gas inlet of a nitrogen sealing valve, and connecting a gas outlet with a gas interface of a reversing hand valve; connecting a vacuum pump with a vacuum pump interface of a reversing hand valve; then the reversing hand valve is sequentially connected with the switch valve, the three-way connector, the outer connector of the gas path pipeline and the first gas path switch;
(2) adjusting the outlet pressure of the pressure adjusting valve, opening a second gas circuit switch to check the indication value of the pressure gauge of the nitrogen sealing valve, and keeping the second gas circuit switch in an open state all the time in the test process;
(3) placing the sample on a sample rack in a test chamber, and closing the test chamber;
(4) opening a first air path switch, setting the reversing hand valve to be in a vacuum state, opening the vacuum pump, and vacuumizing the interior of the test box;
(5) setting the reversing hand valve to be in a nitrogen state, closing the vacuum pump after 25-35 s, enabling nitrogen in an air source to sequentially pass through the pressure regulating valve, the second air path switch, the air inlet and the air outlet of the nitrogen seal valve, the air interface of the reversing hand valve, the switch valve, the three-way interface and the external interface of the air path pipeline to enter the test box, and controlling the nitrogen filling amount according to the indication value of the indicating pressure meter;
(6) repeating the operations in the steps (4) and (5), and performing 4-6 times of cyclic vacuumizing and nitrogen filling operations to replace air in the test box to finish oxygen insulation operation;
(7) after the oxygen insulation state is finished, disconnecting the vacuum pump from the reversing hand valve, turning on a power switch, and adjusting the required experiment temperature through a temperature control meter; monitoring the whole test process according to the required anaerobic aging time;
(8) after the test is finished, the pressure regulating valve, the second gas circuit switch and the power switch are closed, and the connection between the gas source and the nitrogen sealing valve is disconnected; and taking out a sample to perform related item tests.
Further, in the step (2), the outlet pressure of the pressure regulating valve is regulated to 0.2MPa, and a second gas circuit switch is opened to check that the indication value of the pressure gauge of the nitrogen sealing valve is less than 0.2 MPa; vacuumizing the step (4) until the vacuum pressure representation value reaches below-0.09 MPa, and finishing one-time vacuumizing; turning off the vacuum pump after 30s in the step (5) to prevent the vacuum pump from sucking backwards; when the indication value of the indication pressure gauge is higher than 1 atmosphere pressure +1000Pa, the nitrogen valve automatically cuts off the nitrogen supply gas circuit, and the nitrogen filling is completed at one time.
Further, the adopted gas source is nitrogen with the purity of 99.999 percent; the sample is a dumbbell sample or an adhesive force sample, the sample is hung on a sample rack, the sample rack is placed inside the test box, and the test box locking buckle is screwed down.
The invention has the beneficial effects that:
(1) the test device for the rubber material anaerobic aging test is a temperature control test box vacuumizing, nitrogen gas replacing air and pressure anaerobic aging test device, and a nitrogen sealing valve is continuously filled with nitrogen gas to replace air in a box body, so that the nitrogen micro-positive pressure in the box body in the whole process of sample detection is ensured, the pressure anaerobic aging test is realized, and the anaerobic aging performance of rubber is rapidly and accurately tested.
(2) The test device solves the problem that no manufacturer produces anaerobic aging equipment at present and can not carry out anaerobic aging performance test, and compared with the existing method that researchers use self-sealing bagged samples and then vacuumize the samples and put the samples into an aging box for anaerobic performance test, the method for testing the anaerobic aging performance based on the pressure anaerobic aging test established by the test device solves the defects that the samples are in a negative pressure environment after vacuumization, and micromolecular substances such as anti-aging agents can be separated out to influence the performance test of the samples.
(3) The invention vacuumizes the box body through the vacuumizing device until the vacuum degree reaches below-0.09 MPa, fills nitrogen with the purity of 99.999 percent into the test box through the nitrogen filling device, realizes the replacement of air by nitrogen through multiple cycles of vacuumizing and filling nitrogen, and monitors the micro-positive pressure state of the nitrogen in the test box through the micro-positive pressure indicating device; the test device is simple and easy to operate, the test cost of the pressure oxygen-insulation aging is low by replacing air with nitrogen, air can be replaced by other inert gases, the pressure oxygen-insulation aging is realized on the premise of ensuring the cost, and the oxygen-insulation state of the established pressure oxygen-insulation aging test method is controllable in the whole process.
Drawings
FIG. 1 is a schematic structural diagram of a testing device for an anaerobic aging test of rubber compound provided by the invention;
in the upper diagram, 1, test chamber; 2. a power switch; 3. a temperature control meter; 4. a vacuum pressure gauge; 5. a first gas circuit switch; 6. an external interface of the gas path pipeline; 7. indicating a pressure gauge; 8. a three-way interface; 9. an on-off valve; 10. a reversing hand valve; 11. a vacuum pump interface; 12. a vacuum pump; 13. a gas interface; 14. a nitrogen seal valve; 15. a gas outlet; 16. a gas inlet; 17. a second gas path switch; 18. a pressure regulating valve; 19. a gas source; 20. and (4) a sample rack.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For a further understanding of the invention, reference will now be made to the following description taken in conjunction with the accompanying drawings and examples.
As shown in figure 1, the invention relates to a test device for an anaerobic aging test of rubber compound, which is a device for evaluating the anaerobic aging performance of the rubber compound in a laboratory, and the test device comprises:
the test box comprises a test box 1, wherein a gas path pipeline communicated with the inside of the test box 1 is arranged on a box body on one side of the test box 1, and a sample rack 20 for placing a sample is arranged inside the test box 1;
the vacuumizing device comprises a vacuum pressure gauge 4, a first air circuit switch 5, an air circuit pipeline external interface 6, a three-way interface 8, a switch valve 9, a reversing hand valve 10 and a vacuum pump 12; the vacuum pump 12 is connected with a vacuum pump interface 11 of the reversing hand valve 10, the reversing hand valve 10 is sequentially connected with the switch valve 9, the three-way interface 8 and the air path pipeline external interface 6, and the first air path switch 5 is connected with the test box 1;
the inflation device comprises an air source 19, a pressure regulating valve 18, a second air path switch 17, a nitrogen seal valve 14, a reversing hand valve 10, a switch valve 9, a three-way connector 8, an air path pipeline outer connector 6 and a first air path switch 5; the gas source 19 is connected with a gas inlet 16 of the nitrogen seal valve 14 through an external pressure regulating valve 18 and a second gas path switch 17, nitrogen is connected with a gas interface 13 of the reversing hand valve 10 through a gas outlet 15 of the nitrogen seal valve 14, the reversing hand valve 10 is sequentially connected with the switch valve 9, the three-way interface 8 and the gas path pipeline external interface 6, and finally is connected with the test box 1;
the test device also comprises a micro-positive pressure monitoring device, wherein the micro-positive pressure monitoring device comprises a test box 1, an air channel pipeline external interface 6, a three-way interface 8 and an indication pressure gauge 7 for indicating micro-positive pressure, and the indication pressure gauge 7 is connected with the test box 1 through the three-way interface 8 and the air channel pipeline external interface 6.
According to the test device, the interior of the test box 1 is vacuumized through the vacuumizing device until the vacuum degree reaches below-0.09 MPa, nitrogen with the purity of 99.999% and inert gas with similar properties are filled into the test box 1 through the inflating device, vacuumizing and nitrogen filling are repeatedly performed for multiple times of circulation to replace air in the box, the nitrogen sealing valve 14 ensures that the box is kept at micro-positive pressure, the pressure gauge 7 is indicated to detect and monitor the state that the micro-positive pressure is kept in the test box 1, the nitrogen pressure is always kept at 1 standard atmospheric pressure +1000Pa, oxygen pressure and inhibition are achieved, and therefore the oxygen inhibition aging performance test of a sample in the test device is achieved.
It can be understood that one end of the gas path pipeline is fixedly arranged on the test box 1 and communicated with the interior of the box body, the other end of the gas path pipeline is provided with a gas path pipeline external interface 6, and the gas path pipeline external interface 6 is connected with the three-way interface 8; the test box 1 is also provided with a temperature control device; the temperature control device comprises a power switch 2 for starting heating and a temperature control meter 3 for monitoring and adjusting the internal temperature of the test box 1. The power switch 2, the temperature control meter 3, the vacuum pressure meter 4 and the first air circuit switch 5 are all arranged on a front panel of the box body of the test box 1.
In this embodiment, the gas source 19 used in the present invention is nitrogen, and nitrogen is used to replace air to realize the pressure oxygen-insulated aging.
The test device comprises two gas paths which are connected, and the external gas path of the test box 1 is divided into two paths of nitrogen and vacuum.
The use method of the test device for the sizing material anaerobic aging test comprises the following steps:
(1) connection of nitrogen gas circuit: the gas source 19 is sequentially communicated with the pressure regulating valve 18 and the second gas path switch 17 and then is connected with the gas inlet 16 of the nitrogen sealing valve 14, and nitrogen in the gas source 19 is connected with the gas interface 13 of the reversing hand valve 10 through the gas outlet 15 of the nitrogen sealing valve 14; the reversing hand valve 10 is sequentially connected with the switch valve 9, the three-way connector 8 and the air channel pipeline outer connector 6 and further communicated with the test box 1;
(2) connecting a vacuum gas circuit: the vacuum pump 12 is connected with a vacuum pump interface 11 of the reversing hand valve 10, and the reversing hand valve 10 is sequentially connected with the switch valve 9, the three-way interface 8, the air channel pipeline outer interface 6 and the first air channel switch 5 so as to be connected with the test box 1;
(3) adjusting the outlet pressure of a pressure adjusting valve 18 externally connected with a nitrogen pipeline of a laboratory to 0.2MPa, opening a second gas pipeline switch 17 to check that the pressure indication value of a nitrogen seal valve 14 is less than 0.2MPa, and keeping the second gas pipeline switch 17 in an open state all the time in the test process;
(4) hanging a dumbbell test sample or an adhesive force test sample on a test sample rack 20, placing the test sample rack 20 inside a test box 1, and screwing a locking buckle of the test box 1;
(5) the first air path switch 5 of the front panel of the test box 1 is always in an open position; placing a reversing hand valve 10 on the side surface of the test box 1 at a vacuum position, opening a vacuum pump 12, vacuumizing the interior of the test box 1 until the indication value of a vacuum pressure gauge 4 reaches below-0.09 MPa, and finishing one-time vacuumizing;
(6) a reversing hand valve 10 on the side surface of the test box 1 is arranged in (N)2The position of the marker is that,after 30s, the switch of the vacuum pump 12 is closed to prevent the vacuum pump 12 from sucking backwards, nitrogen with the purity of 99.999 percent starts from the air source 19, and is filled into the test box 1 through the pressure regulating valve 18, the second air path switch 17, the air inlet 16 of the nitrogen sealing valve 14, the air outlet 15 of the nitrogen sealing valve 14, the air interface 13 of the reversing hand valve 10, the switch valve 9, the three-way interface 8 and the air path pipeline external interface 6; when the indication value of an indication pressure gauge 7 for indicating the micro-positive pressure is higher than 1 atmosphere pressure +1000Pa, the nitrogen sealing valve 14 automatically cuts off a nitrogen supply gas path, and one-time nitrogen filling is completed;
(7) repeating the vacuumizing operation in the step (5) and the nitrogen filling operation in the step (6), circulating for 5 times, and replacing air in the box to complete the setting of the oxygen insulation state; then, disconnecting an air pipe connecting a vacuum pump 12 with a vacuum pump interface 11 of a reversing hand valve 10, arranging the air pipe on one side of a test box 1, opening a power switch 2 which is arranged on a front panel of the test box 1 and used for heating, and adjusting the required experiment temperature by using a temperature control table 3; formally starting an anaerobic aging experiment, and monitoring the whole test process according to the required anaerobic aging time;
(8) after the experiment is finished, closing a pressure regulating valve 18 of a nitrogen pipeline of the laboratory, closing a second gas circuit switch 17 externally connected with the test box 1, closing a power switch 2 of a front panel of the test box, and disconnecting a gas pipe connected with a gas inlet 16 of the nitrogen sealing valve 14 to arrange the gas pipe on one side of the nitrogen sealing valve 14; and opening the door of the test box 1, wearing heat-insulating gloves to take out the sample rack 20, taking down the sample lofting chamber, and adjusting to perform related project tests.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the present invention. Any modification, equivalent replacement, or modification made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A test device for a sizing material anaerobic aging test is characterized by comprising:
the test box is provided with a gas path pipeline;
the vacuumizing device comprises a vacuum pump, the vacuum pump is communicated with a reversing hand valve, and the reversing hand valve is communicated with the gas path pipeline after being sequentially connected with a switch valve and a three-way connector;
the inflation device comprises an air source and a nitrogen sealing valve communicated with the air source, the nitrogen sealing valve is connected with a reversing hand valve, and the reversing hand valve is communicated with the air path pipeline after being sequentially connected with a switch valve and a three-way connector;
the micro-positive pressure monitoring device comprises an indication pressure gauge for indicating micro-positive pressure, wherein the indication pressure gauge is arranged between the three-way connector and the gas path pipeline and is communicated with the test box.
2. The testing device of claim 1, wherein the test chamber has a sample holder disposed therein.
3. The test device according to claim 1, wherein one end of the gas path pipeline is fixedly arranged on the test box and communicated with the interior of the box body, and the other end of the gas path pipeline is provided with an external gas path pipeline interface; the test box is also provided with a temperature control device; the temperature control device comprises a power switch and a temperature control meter.
4. The testing device of claim 3, wherein a vacuum pump interface is arranged on the reversing hand valve, and the vacuum pump is connected with the vacuum pump interface; the external interface of the gas path pipeline is connected with the three-way interface; the vacuumizing device further comprises a vacuum pressure gauge and a first air circuit switch, and the vacuum pressure gauge and the first air circuit switch are both installed on the box body of the test box.
5. The testing device according to claim 1, wherein a pressure regulating valve and a second gas path switch are installed between the gas source and the nitrogen sealing valve; the nitrogen sealing valve is provided with a gas inlet and a gas outlet, the reversing hand valve is provided with a gas interface, the gas source is connected with the gas inlet of the nitrogen sealing valve through a pressure regulating valve and a second gas path switch, and the gas outlet of the nitrogen sealing valve is connected with the gas interface of the reversing hand valve; the gas source is nitrogen or other inert gas with similar property with nitrogen.
6. The testing device of claim 1, wherein the indication pressure gauge is connected to the test chamber through the three-way port and the external port of the air passage pipe, and is used for indicating the micro-positive pressure state inside the test chamber.
7. Test method for the anaerobic ageing test of rubber mixtures, characterized in that the test apparatus according to claims 1 to 6 is used, comprising the following steps:
(1) connecting a gas source with a pressure regulating valve, a second gas circuit switch and a gas inlet of a nitrogen sealing valve, and connecting a gas outlet with a gas interface of a reversing hand valve; connecting a vacuum pump with a vacuum pump interface of a reversing hand valve; then the reversing hand valve is sequentially connected with the switch valve, the three-way connector, the outer connector of the gas path pipeline and the first gas path switch;
(2) adjusting the outlet pressure of the pressure adjusting valve, opening a second gas circuit switch to check the indication value of the pressure gauge of the nitrogen sealing valve, and keeping the second gas circuit switch in an open state all the time in the test process;
(3) placing the sample on a sample rack in a test chamber, and closing the test chamber;
(4) opening a first air path switch, setting the reversing hand valve to be in a vacuum state, opening the vacuum pump, and vacuumizing the interior of the test box;
(5) setting the reversing hand valve to be in a nitrogen state, closing the vacuum pump after 25-35 s, enabling nitrogen in an air source to sequentially pass through the pressure regulating valve, the second air path switch, the air inlet and the air outlet of the nitrogen seal valve, the air interface of the reversing hand valve, the switch valve, the three-way interface and the external interface of the air path pipeline to enter the test box, and controlling the nitrogen filling amount according to the indication value of the indicating pressure meter;
(6) repeating the operations in the steps (4) and (5), and performing 4-6 times of cyclic vacuumizing and nitrogen filling operations to replace air in the test box to finish oxygen insulation operation;
(7) after the oxygen insulation state is finished, disconnecting the vacuum pump from the reversing hand valve, turning on a power switch, and adjusting the required experiment temperature through a temperature control meter; monitoring the whole test process according to the required anaerobic aging time;
(8) after the test is finished, the pressure regulating valve, the second gas circuit switch and the power switch are closed, and the connection between the gas source and the nitrogen sealing valve is disconnected; and taking out a sample to perform related item tests.
8. The testing method according to claim 7, wherein in the step (2), the outlet pressure of the pressure regulating valve is regulated to 0.2MPa, and a second gas circuit switch is opened to check that the pressure indication value of the nitrogen-sealed valve is less than 0.2 MPa; vacuumizing the step (4) until the vacuum pressure representation value reaches below-0.09 MPa, and finishing one-time vacuumizing; turning off the vacuum pump after 30s in the step (5) to prevent the vacuum pump from sucking backwards; when the indication value of the indication pressure gauge is higher than 1 atmosphere pressure +1000Pa, the nitrogen valve automatically cuts off the nitrogen supply gas circuit, and the nitrogen filling is completed at one time.
9. The test method according to claim 7, wherein the gas source used is nitrogen gas of 99.999% purity; the sample is a dumbbell sample or an adhesive force sample, the sample is hung on a sample rack, the sample rack is placed inside the test box, and the test box locking buckle is screwed down.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324840A (en) * | 2021-12-13 | 2022-04-12 | 天津六0九电缆有限公司 | Test method for rapidly judging cable material frosting |
| CN114720803A (en) * | 2022-04-05 | 2022-07-08 | 苏州中科科美科技有限公司 | Environment forming method and test system |
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2021
- 2021-09-27 CN CN202111136175.1A patent/CN113670807A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324840A (en) * | 2021-12-13 | 2022-04-12 | 天津六0九电缆有限公司 | Test method for rapidly judging cable material frosting |
| CN114324840B (en) * | 2021-12-13 | 2024-01-23 | 天津六0九电缆有限公司 | Test method for rapidly judging cable material frosting |
| CN114720803A (en) * | 2022-04-05 | 2022-07-08 | 苏州中科科美科技有限公司 | Environment forming method and test system |
| CN114720803B (en) * | 2022-04-05 | 2023-01-31 | 苏州中科科美科技有限公司 | Environment forming method and test system |
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