CN117928855A - Pressure vessel detection system - Google Patents

Abstract

Embodiments of the present application provide a pressure vessel inspection system. The system comprises: the detection station is provided with pressure acquisition equipment for acquiring pressure data of the pressure container; the control cabinet is provided with a safety protection control, a starting control, a stopping control and a control; when the safety protection control is triggered, if the starting control is detected to be triggered, the control cabinet automatically executes a pressure test program based on pressure data of the pressure container; in the process of automatically executing the pressure test program, the control cabinet responds to the trigger of the stop control and shields the control, the start control and the safety protection control; and resetting the safety protection control after the execution of the pressure test program is finished. The embodiment of the application can realize automatic detection and effectively protect the safety of operators.

Description

Pressure vessel detection system

Technical Field

The application relates to the technical field of pressure vessels, in particular to a pressure vessel detection system.

Background

With the development of social economy and high speed, the number of vehicles for transporting liquefied gas is increased, the pressure container is used as a storage device for liquefied gas and is often subjected to a high-pressure environment, and serious accidents can be caused by overlarge pressure in the pressure container, so that the detection of the pressure in the pressure container is very important. The pressure detection of the pressure vessel is currently performed manually, and the operator evaluates the pressure inside the pressure vessel by observing the readings on a mechanical pressure gauge.

However, since the operator needs to observe the readings on the mechanical pressure gauge for a long time and perform the detection of the pressure vessel in person, the workload of the operator is excessive, and serious accidents are easily caused once the operation is improper.

Disclosure of Invention

In order to solve the above technical problems, an embodiment of the present application provides a detection system for a pressure vessel.

In a first aspect, embodiments of the present application provide a pressure vessel inspection system, the system comprising: the detection station is provided with pressure acquisition equipment for acquiring pressure data of the pressure container; the control cabinet is provided with a safety protection control, a starting control, a stopping control and a control; when the safety protection control is triggered, if the starting control is detected to be triggered, the control cabinet automatically executes a pressure test program based on pressure data of the pressure container; in the process of automatically executing the pressure test program, the control cabinet responds to the trigger of the stop control and shields the control, the start control and the safety protection control; and resetting the safety protection control after the execution of the pressure test program is finished.

In one embodiment of the application, based on the foregoing, the system further comprises a gas source line connected to the pressure vessel, and a gas source valve controlling the flow of gas source; the step of automatically executing the pressure test program comprises the following steps: if the pressure container is a container with a standard pressure grade, opening a corresponding air source valve according to the standard pressure grade so that the internal pressure of the pressure container reaches a pressure value corresponding to the standard pressure grade, and simultaneously opening one air source valve at most at the same detection station; and if the internal pressure of the pressure container does not drop or falls within a preset pressure range within a preset time period, judging that the air tightness of the pressure container reaches a preset air tightness standard.

In one embodiment of the present application, based on the foregoing, the step of automatically performing the pressure test procedure further includes: if the pressure container is a container with a non-standard pressure grade, acquiring a required pressure value of the pressure container; and opening a corresponding air source valve according to the required pressure value of the pressure container, wherein at most one air source valve is simultaneously opened at the same detection station.

In one embodiment of the application, based on the foregoing, the gas source lines comprise a low pressure gas source, a medium pressure gas source and a high pressure gas source, respectively; the step of automatically executing the pressure test program further includes: and if the required pressure value reaches above a preset pressure limit value, sequentially opening an air source valve corresponding to the low-pressure air source, an air source valve corresponding to the medium-pressure air source and an air source valve corresponding to the high-pressure air source.

In one embodiment of the application, based on the foregoing solution, a pipeline valve is provided between a first pressure container and a second pressure container, wherein the first pressure container is a pressure container with air tightness reaching a preset standard, and the second pressure container is a pressure container to be detected; the step of automatically executing the pressure test program further includes: opening the pipeline valve to enable the internal pressure of the first pressure container to be equal to the internal pressure of the second pressure container, and continuing the pressure test; and after the pressure test, if the internal pressure of the second pressure container is not reduced or is reduced within a preset pressure range within a preset time period, judging that the air tightness of the second pressure container reaches a preset air tightness standard.

In one embodiment of the application, based on the foregoing, the system further comprises a bleed valve and a vacuum pump connected to the first pressure vessel, a vacuum pump control box being provided between the vacuum pump and the first pressure vessel; the step of automatically executing the pressure test program further includes: opening the bleed valve to equalize the internal pressure of the first pressure vessel to the external air pressure; and starting the vacuum pump through the vacuum pump control box so that the air content of the first pressure container reaches the preset air content range.

In one embodiment of the present application, based on the foregoing, the system further includes a liquid nitrogen storage tank connected to the first pressure vessel, and a nitrogen valve control box is disposed between the liquid nitrogen storage tank and the first pressure vessel; the step of automatically executing the pressure test program further includes: and opening the liquid nitrogen storage tank through the nitrogen valve control box so that the ratio of the nitrogen content to the oxygen content of the first pressure container reaches above a preset ratio.

In an embodiment of the present application, based on the foregoing solution, the control cabinet is further provided with a signal indicator for indicating a test condition of the detection station, where the test condition includes no ongoing test, and faults and fault mess codes of the ongoing test.

In one embodiment of the present application, based on the foregoing scheme, the detection station is provided with a data collection box, and the data collection box is provided with an emergency stop button, where the emergency stop button is used to stop the test that the corresponding detection station is running.

In one embodiment of the present application, based on the foregoing, the data collection box is provided with a travel switch, for detecting whether a metal hose is mounted to the pressure vessel; after the metal hose is installed in the pressure vessel, a pressure test procedure can be initiated.

In the technical scheme provided by the embodiment of the application:

The pressure vessel detection system is provided with a detection station, a pressure acquisition device is arranged on the detection station, pressure data of the pressure vessel are acquired through the pressure acquisition device, the pressure vessel detection system is also provided with a control cabinet, a safety protection control, a starting control, a stopping control and a control are arranged on the control cabinet, when the safety protection control is triggered, if the starting control is also detected to be triggered, the control cabinet can automatically execute a pressure test program according to the pressure data of the pressure vessel, so that the workload of operators is reduced; and in the process of automatically executing the pressure test program, the control cabinet can respond to the trigger of the stop control, but shields the control, the start control and the safety protection control, and resets the safety protection control until the execution of the pressure test program is finished, so that serious accidents can be avoided, and the safety of operators is ensured.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a schematic diagram of a detection system of a pressure vessel according to an exemplary embodiment of the present application;

Fig. 2 is a signal transmission schematic diagram of a detection system of a pressure vessel according to an exemplary embodiment of the present application.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.

The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.

Also to be described is: in the present application, the term "plurality" means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., a and/or B may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The terms "first," "second," "third," and "fourth" and the like in the description and in the claims and drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. The terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Currently, pressure detection of a pressure vessel is often performed manually, and an operator evaluates the pressure inside the pressure vessel by observing readings on a mechanical pressure gauge. However, since the operator needs to observe the readings on the mechanical pressure gauge for a long time and perform the detection of the pressure vessel in person, the workload of the operator is excessive, and serious accidents are easily caused once the operation is improper.

In order to solve the above technical problems, the present application provides a pressure vessel detection system, and the pressure vessel detection system is described in detail below.

The pressure vessel detection system comprises a detection station, wherein a pressure acquisition device is arranged on the detection station and used for acquiring pressure data of the pressure vessel. The pressure acquisition equipment can provide the inside pressure of real-time effectual pressure vessel in the test, can in time report to the police and pause pressure detection when pressure data is unusual or pressure acquisition equipment data fail. It should be noted that, the pressure acquisition device has higher accuracy than the traditional mechanical pressure gauge, for example, the pressure acquisition device may be a remote pressure gauge, a digital pressure gauge, an intelligent pressure sensor, etc. The remote pressure gauge can display pressure data on site and can display the pressure data remotely; the pressure data is remotely displayed through the remote pressure gauge, so that the burden that an operator needs to observe the reading on the mechanical pressure gauge for a long time can be reduced, and the accuracy of pressure detection can be improved.

Further, this embodiment is provided with more than two detection stations, still is provided with the data acquisition case on every detection station, and the data acquisition case is used for collecting each item test data to still be provided with the scram button on the data acquisition case, stop the experiment that corresponds detection station and be running through the scram button.

The embodiment is provided with two detection stations, namely a detection station 1 and a detection station 2, and is correspondingly provided with a data acquisition box 1 and a data acquisition box 2, wherein the data acquisition box 1 and the data acquisition box 2 are respectively provided with a scram button 1 and a scram button 2; the test station 1 can be controlled to stop the running test by the scram button 1, and the test station 2 can be controlled to stop the running test by the scram button 2.

And a travel switch is further provided beside each data collection box for detecting whether the metal hose is mounted on the pressure vessel, and the pressure test program can be automatically executed only after the metal hose is mounted on the pressure vessel.

Further, the data acquisition box is also provided with an on-site indicator lamp, the on-site indicator lamp can display various colors and give out an alarm, the use condition of the current detection station can be indicated through the display of different colors, and an operator can be reminded through the sent alarm.

The pressure vessel's detecting system still includes the switch board, and the switch board is installed in the operation room to kept away from the dangerous zone that the experiment took place, consequently can avoid most potential safety hazards for operating personnel. The control cabinet is provided with a safety protection control, a starting control, a stopping control and a control, wherein the starting control is used for controlling a starting pressure test program, and the starting control can be a starting button, a starting rocker and the like; the safety protection control is used for providing safety protection for operators, and the safety protection control can be a 'worker protection button', a 'worker protection rocker' and the like.

Specifically, after the safety protection control is triggered, if the starting control is detected to be triggered, the control cabinet automatically executes a pressure test program based on pressure data of the pressure container; in the process of automatically executing the pressure test program, the control cabinet can respond to the trigger of the stop control, and shield the control, the start control and the safety protection control. The stop controls include an emergency stop control and a stop control, the stop control being used to stop the pressure test program being executed on all the inspection stations and to close all the valves at the physical level. Therefore, the pressure test program being executed can be prevented from being influenced by the false touch of the operator, and further safety protection is provided for the operator. Further, after the safety protection control is triggered, the indicator lights corresponding to the safety protection control emit red light, all valves are automatically closed, and the triggering of the starting control is waited.

The manipulation control is used for controlling the execution of other programs. Specifically, the control controls include a "selection station" control, a "selection pressure vessel" control, an "administrator key" control, a "vacuum pump remote control" control, a "nitrogen valve remote control" control, a "touch screen picture switching" control, a "selection test type" control, and the like. These controls are each described in detail below.

The 'selection station' control is used for selecting the detection stations, the selection sequence is based on the previous selection, and after the detection stations are selected, the touch screen on the control cabinet can be switched to the control picture corresponding to the detection stations, so that operators can observe the pressure test program which is executed by the selected detection stations.

The "select pressure vessel" control is used to select pressure vessels of different pressure levels. The pressure vessels may be classified into standard pressure-rated vessels and non-standard pressure-rated vessels, wherein the internal pressure values corresponding to the standard pressure-rated vessels are predetermined, for example, a vessel having an internal pressure of 0.8 mpa is used as a low pressure-rated vessel, a vessel having an internal pressure of 2.72 mpa is used as a medium pressure-rated vessel, and a vessel having an internal pressure of 4.54 mpa is used as a high pressure-rated vessel; and if the internal pressure of the pressure vessel is not equal to the three predetermined pressure values, it indicates that the pressure vessel is a non-standard pressure rated vessel.

The "Administrator Key" control is used to obtain Administrator rights. For example, when the pressure vessel is a non-standard pressure rated vessel, administrator rights may be acquired before testing the non-standard pressure rated vessel.

The control piece of the remote control of the vacuum pump is used for controlling the vacuum pumps corresponding to the plurality of groups of detection stations, and the vacuum pump can be controlled to be in a manual mode/an automatic mode, but a knob on a control box of the vacuum pump is required to be in a remote control position before the control is performed.

The "nitrogen valve remote control" control is used to control multiple nitrogen valves, which can be controlled in manual/automatic mode, but also requires a knob on the nitrogen valve control box to a "remote control" position prior to control.

The touch screen picture switching control is used for switching control pictures corresponding to different detection stations, and a picture switching reserved point is reserved on the control cabinet and used for expanding functions. The touch screen on the control cabinet can display a main interface, a detection station interface, a login interface, a manual interface and the like. These four interfaces are described in detail below, respectively. The main interface can display the internal pressure of the pressure container corresponding to each detection station, whether an operator exists on the detection station, a pressure test program being executed by the detection station, an opened valve on the detection station, the start-stop condition of the vacuum pump and other information; the detection station interface can display the information of the pressure test program, the historical pressure curve, the selected test type, the pressure grade of the selected pressure container, the time of the current test, the predicted completion time of the current test and the like which are executed by the selected detection station; a login interface which can log in through an account password to obtain rights such as 'site workers', 'administrators', and the like; the manual interface can manually control any valve after obtaining the rights of 'site workers' and 'administrators'.

The "select test type" control is used to select the test to be performed on the pressure vessel, wherein the test types include "air tightness test", "pouring test", "venting test", "vacuum test" and "nitrogen substitution test".

When the air tightness test is selected, the detection system of the pressure container further comprises an air source pipeline connected with the pressure container and an air source valve for controlling the air source to circulate.

In an exemplary embodiment, if the pressure vessel is a standard pressure rated vessel, the corresponding gas source valves are opened according to their standard pressure rating such that the internal pressure of the pressure vessel reaches a pressure value corresponding to the standard pressure rating, during which at most one gas source valve is simultaneously opened. It should be noted that the air source pipeline contains air sources with various pressure levels, wherein the air sources comprise various air sources such as compressed air, air exhaust, vacuum, nitrogen and the like, and a plurality of air source valves corresponding to the various air sources are also arranged. If the internal pressure of the pressure vessel does not drop or falls within a preset pressure range within a preset time period, it can be determined that the air tightness of the pressure vessel reaches a preset air tightness standard, and after determining whether the air tightness of the pressure vessel reaches the preset air tightness standard, the air tightness test is completed.

In another exemplary embodiment, if the pressure vessel is a non-standard pressure-class vessel, after the "administrator" authority is obtained and the required pressure value of the pressure vessel is obtained, the corresponding air source valves are opened according to the required pressure value of the pressure vessel, and in the process, at most one air source valve of the same detection station is opened at the same time.

In an exemplary embodiment, if the air supply lines respectively include a low pressure air supply, a medium pressure air supply and a high pressure air supply, and the pressure value required by the container with the non-standard pressure level is above the preset pressure limit value, the air supply valve corresponding to the low pressure air supply, the air supply valve corresponding to the medium pressure air supply and the air supply valve corresponding to the high pressure air supply are sequentially opened, and still at most one air supply valve of the same detection station is simultaneously opened.

When the 'tank inversion test' is selected, a pipeline valve is arranged between the first pressure container and the second pressure container, wherein the first pressure container is a pressure container with air tightness reaching a preset standard, and the second pressure container is a pressure container to be detected. By opening the pipe valve between the first pressure vessel and the second pressure vessel, the internal pressure of the first pressure vessel and the internal pressure of the second pressure vessel are quickly balanced, time is greatly saved, and the 'gas tightness test' can be continued. If the internal pressure of the second pressure container does not drop or falls within the preset pressure range within the preset time period, it is determined that the air tightness of the second pressure container also meets the preset air tightness standard. Therefore, the time cost of the test process is saved to a certain extent by carrying out the 'pouring test', and the economic benefit is improved.

When "vent test" is selected, the internal pressure of the first pressure vessel is equalized with the external air pressure by opening the vent valve.

When the vacuum test is selected, the vacuum pump is started through the vacuum pump control box, so that the air content of the first pressure container reaches the preset air content range. The purpose of the "vacuum test" is to pump out or to within a predetermined air content range the internal air of the first pressure vessel to ensure that the interior of the first pressure vessel does not rust. More, the vacuum pump control box is also provided with a plurality of groups of knobs, so that the knobs can be controlled in situ, and the operation of the vacuum pump can be controlled in situ; the knob can be further turned to be 'remote control', and the operation of the vacuum pump is controlled by the control cabinet at the remote end.

When the nitrogen replacement test is selected, the detection system of the pressure container further comprises a liquid nitrogen storage tank, the liquid nitrogen storage tank is connected with the first pressure container, a nitrogen valve control box is arranged between the liquid nitrogen storage tank and the first pressure container support, and the liquid nitrogen storage tank is opened through the nitrogen valve control box, so that the ratio of the nitrogen content to the oxygen content of the first container is more than a preset ratio. The nitrogen replacement test is to inject nitrogen into the first pressure container to enable the ratio of the nitrogen to the oxygen to reach above a preset ratio, so that the first pressure container is further guaranteed not to rust.

In another exemplary embodiment, a signal indicator is further provided on the control cabinet for indicating the test condition of the detection station, the test condition including the absence of an ongoing test, the presence of an ongoing test, and the occurrence of a fault and a fault disorder in the ongoing test.

Further, the signal indicator light may be an audible and visual indicator light, which when displayed red, indicates that no test is in progress at the current inspection station; when the audible and visual indicator light displays green, indicating that an ongoing test exists at the current detection station; and when the audible and visual indicator lamp displays yellow and sounds buzzing, indicating that faults and fault messy codes appear in the test of the current detection station.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a detection system of a pressure vessel according to an exemplary embodiment of the present application. The detection system of the pressure container in the figure comprises a vacuum pump, a vacuum pump control box, a control cabinet, a nitrogen valve control box, various air source pipelines, an on-site indicator lamp, a remote pressure gauge, a data acquisition box with an emergency stop button, a plurality of groups of remote control valves and a pressure container to be detected. These devices are described in detail below, respectively.

A vacuum pump is a device for creating a vacuum environment. The vacuum pump control box is equipment for controlling and monitoring the operation of the vacuum pump, and comprises a manual mode and an automatic mode, and can control the vacuum pump to pump the internal air of the pressure vessel to be tested and create a vacuum environment for the pressure vessel to be tested. The control cabinet can control all detection stations, vacuum pumps, liquid nitrogen valves and the like simultaneously. The nitrogen valve control box is a device for controlling the nitrogen valve. The various gas source pipelines at least comprise three pressure grade gas sources, namely a low pressure gas source, a medium pressure gas source and a high pressure gas source, and the gas source types can comprise compressed air, emptying, vacuum and nitrogen. The in-situ indicator light can display various colors and can sound, and is used for indicating the use condition of the detection station and alarming to operators. The remote pressure gauge is used for detecting the internal pressure of the pressure vessel to be detected in real time. The data acquisition box with the scram button is used for collecting various test data, and the scram button is also arranged on the data acquisition box, and the corresponding test station running test is stopped through the scram button. The remote control valves are arranged corresponding to the various air source pipelines and are used for controlling the circulation of various air sources to the pressure container to be tested. The pressure vessel to be tested is a pressure vessel which needs to be tested.

Referring to fig. 2, fig. 2 is a schematic signal transmission diagram of a detection system of a pressure vessel according to an exemplary embodiment of the application. Two rows of wiring terminals are arranged in the field data acquisition box and are used for conveying a field emergency stop signal, a group of pressure signals, a group of valve opening/closing feedback signals and a group of metal hose detection switch signals to the control cabinet and conveying valve control signals and signal indicator lamp signals of the control cabinet to the detection station. The on-site data acquisition box can collect switch feedback signals through detecting the detecting switch of the station metal hose, can collect on-site pressure signals through the remote transmission pressure transmitter, can collect valve opening and closing feedback and valve opening and closing signals through the remote control pneumatic valve group, and can collect station indicator lamp color signals through the station indicator lamp. The on-site data acquisition box collects and simultaneously sends valve on-off signals and station indicator lamp color signals to the cluster station 2 so as to control the indicator lamps of the control cabinet and the control signals of the valves and the indicator lamps; switch feedback signals, field pressure signals and valve opening and closing feedback are sent to the slave station 1 to control the emergency stop button, remote control valve opening and closing in-place feedback. The field data acquisition box sends the switch feedback signal, the field pressure signal, and the valve opening and closing feedback to the PLC (Programmable Logic Controller ), but since the signal isolator bank can only deliver the pressure signal to the PLC. In addition, the PLC also receives button signals sent by the control cabinet button group and other signals sent by the touch screen and the Internet of things module. The PLC is a master station for data communication and is responsible for processing received signal data; the PLC may send a request to the plexer station 1 or plexer station 2, or may respond to the requests of plexer station 1 or plexer station 2.

Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.

It should be understood that the foregoing is only illustrative of the preferred embodiments of the present application and is not intended to limit the embodiments of the present application, and that various changes and modifications can be made herein without departing from the spirit and scope of the application as defined by the appended claims.

Claims (10)

1. A system for testing a pressure vessel, the system comprising:

the detection station is provided with pressure acquisition equipment for acquiring pressure data of the pressure container;

The control cabinet is provided with a safety protection control, a starting control, a stopping control and a control;

When the safety protection control is triggered, if the starting control is detected to be triggered, the control cabinet automatically executes a pressure test program based on pressure data of the pressure container; in the process of automatically executing the pressure test program, the control cabinet responds to the trigger of the stop control and shields the control, the start control and the safety protection control;

And resetting the safety protection control after the execution of the pressure test program is finished.

2. The system of claim 1, further comprising a gas source line connected to the pressure vessel and a gas source valve controlling the flow of a gas source; the step of automatically executing the pressure test program comprises the following steps:

if the pressure container is a container with a standard pressure grade, opening a corresponding air source valve according to the standard pressure grade so that the internal pressure of the pressure container reaches a pressure value corresponding to the standard pressure grade, and simultaneously opening one air source valve at most at the same detection station;

And if the internal pressure of the pressure container does not drop or falls within a preset pressure range within a preset time period, judging that the air tightness of the pressure container reaches a preset air tightness standard.

3. The system of claim 2, wherein the step of automatically performing a pressure test procedure further comprises:

If the pressure container is a container with a non-standard pressure grade, acquiring a required pressure value of the pressure container;

And opening a corresponding air source valve according to the required pressure value of the pressure container, wherein at most one air source valve is simultaneously opened at the same detection station.

4. A system according to claim 3, wherein the gas source lines comprise a low pressure gas source, a medium pressure gas source and a high pressure gas source, respectively; the step of automatically executing the pressure test program further includes:

and if the required pressure value reaches above a preset pressure limit value, sequentially opening an air source valve corresponding to the low-pressure air source, an air source valve corresponding to the medium-pressure air source and an air source valve corresponding to the high-pressure air source.

5. The system of claim 2, wherein a pipeline valve is arranged between a first pressure vessel and a second pressure vessel, wherein the first pressure vessel is a pressure vessel with air tightness reaching a preset standard, and the second pressure vessel is a pressure vessel to be detected; the step of automatically executing the pressure test program further includes:

opening the pipeline valve to enable the internal pressure of the first pressure container to be equal to the internal pressure of the second pressure container, and continuing the air tightness test;

And if the internal pressure of the second pressure container does not drop or falls within a preset pressure range within a preset time period, judging that the air tightness of the second pressure container reaches a preset air tightness standard.

6. The system of claim 5, further comprising a bleed valve and a vacuum pump connected to the first pressure vessel, a vacuum pump control box being provided between the vacuum pump and the first pressure vessel; the step of automatically executing the pressure test program further includes:

opening the bleed valve to equalize the internal pressure of the first pressure vessel to the external air pressure;

And starting the vacuum pump through the vacuum pump control box so that the air content of the first pressure container reaches the preset air content range.

7. The system of claim 5, further comprising a liquid nitrogen reservoir connected to the first pressure vessel, a nitrogen valve control box being disposed between the liquid nitrogen reservoir and the first pressure vessel; the step of automatically executing the pressure test program further includes:

and opening the liquid nitrogen storage tank through the nitrogen valve control box so that the ratio of the nitrogen content to the oxygen content of the first pressure container reaches above a preset ratio.

8. The system of claim 1, wherein the control cabinet is further provided with a signal indicator for indicating test conditions of the detection station, the test conditions including absence of an ongoing test, presence of an ongoing test, and malfunction scrambling of an ongoing test.

9. The system of claim 1, wherein the inspection station is provided with a data collection box, and wherein the data collection box is provided with a scram button for stopping an experiment in which the corresponding inspection station is operating.

10. The system of claim 9, wherein a travel switch is provided beside the data collection tank for detecting whether a metal hose is mounted to the pressure vessel; after the metal hose is installed in the pressure vessel, a pressure test procedure can be initiated.