Automatic pressure test line for cryogenic gas cylinders

Abstract

The present application discloses an automatic pressure test assembly line for cryogenic gas cylinders, comprising: a gas transmission pipeline, a pressure test system, a safety system, an automatic conveying system and a control system connected to the electronic equipment of each system, the gas transmission pipeline comprising a liquid nitrogen cryogenic storage tank, a cryogenic liquid reciprocating pump, a solar vaporization chamber and a gas storage unit which are connected in sequence, the outlet of the gas storage unit being connected to a main pipeline at one end forming an exhaust port; the pressure test system comprises a plurality of pressure test chambers, each of which is equipped with a pressure test pipe connecting the main pipeline and the cryogenic gas cylinder; the safety system has a plurality of safety branches connected in parallel between the pressure test system and the exhaust port, the plurality of safety branches are selectively connected between the pressure test system and the exhaust port, and the pressure test safety valves of the plurality of safety branches have different pressure levels; the automatic conveying system is arranged on one side of a plurality of pressure test chambers to transport the cryogenic gas cylinders to the pressure test chambers; the present application realizes intelligent pressure testing to ensure the safety, accuracy and efficiency of the test.

Description

Technical Field

[0001] The present application relates to the technical field of cryogenic gas cylinder production, and in particular to an automatic pressure test assembly line for cryogenic gas cylinders. Background Art

[0002] In the production of cryogenic gas cylinders, testing their safety and airtightness is a critical process, and this test carries certain risks. Therefore, there is a need for an automated pressure testing line that can ensure operator safety. During the pressure test, it is necessary to ensure that the pressure within the test pipeline does not exceed the limit to ensure the safety of the pressure test process. When testing different types of cryogenic gas cylinders, it is necessary to connect pressure safety systems with different pressure levels to ensure the safety of the pressure test process. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of this application is to provide an automatic pressure test line for cryogenic gas cylinders with high intelligence, high safety and high testing efficiency.

[0004] To achieve the above objectives, the present application adopts the following technical solution: an automatic pressure test line for cryogenic gas cylinders, comprising:

[0005] A gas transmission pipeline includes a liquid nitrogen cryogenic storage tank, a cryogenic liquid reciprocating pump, a solar vaporization chamber, and a gas storage unit that are sequentially connected, wherein the outlet of the gas storage unit is connected to one end of a main pipeline, and the other end of the main pipeline forms an exhaust port;

[0006] A pressure test system comprising a plurality of pressure test chambers connected in parallel downstream of the gas storage unit, each of the pressure test chambers being configured to accommodate at least one cryogenic gas cylinder, and each of the pressure test chambers being equipped with a pressure test tube connecting the main pipeline and the corresponding cryogenic gas cylinder, and a nitrogen detector, each of the nitrogen detectors being configured to detect whether there is nitrogen leakage from the cryogenic gas cylinder in the corresponding pressure test chamber during a pressure test, and each of the pressure test tubes being equipped with a pressure test solenoid valve for controlling the flow of fluid in the pressure test tube;

[0007] A safety system comprising a plurality of safety branches connected in parallel between the pressure test system and the exhaust port, wherein both ends of each safety branch are connected to the main pipeline and each safety branch comprises a pressure test safety valve and a pressure relief solenoid valve for controlling the flow of fluid in the corresponding safety branch. One of the plurality of safety branches is selectively connected between the pressure test system and the exhaust port, and the pressure ratings of the pressure test safety valves of the plurality of safety branches are different from each other.

[0008] an automatic transport system disposed on one side of the plurality of pressure test chambers, the automatic transport system comprising a plurality of spaced automatic transport rails and a transport robot disposed between two adjacent automatic transport rails, each of the automatic transport rails extending in a front-to-rear direction to transport the cryogenic gas cylinders in the front-to-rear direction, and each of the transport robots being used to transport the cryogenic gas cylinders between the automatic transport rails and the pressure test chambers; and

[0009] The control system is signal-connected to the gas pipeline, the pressure test system, the safety system, and the electronic equipment of the automatic delivery system.

[0010] In the above technical solution, it is further preferred that a first pressure transmitter is installed on the liquid nitrogen cryogenic storage tank, and a first solenoid valve and a second solenoid valve are provided in parallel between the liquid nitrogen cryogenic storage tank and the cryogenic liquid reciprocating pump, the first solenoid valve connects the bottom of the liquid nitrogen cryogenic storage tank with the cryogenic liquid reciprocating pump via a pipeline, and the second solenoid valve connects the top of the liquid nitrogen cryogenic storage tank with the cryogenic liquid reciprocating pump via a pipeline; the first pressure transmitter, the first solenoid valve, the second solenoid valve and the cryogenic liquid reciprocating pump are controlled in linkage.

[0011] In the above technical solution, it is further preferred that the gas storage unit includes a nitrogen buffer tank and a second pressure transmitter installed on the nitrogen buffer tank, and the second pressure transmitter is controlled in linkage with the cryogenic liquid reciprocating pump.

[0012] In the above technical solution, it is further preferred that safety pressure relief valves are installed on the nitrogen buffer tank and between the first solenoid valve and the cryogenic liquid reciprocating pump.

[0013] In the above technical solution, it is further preferred that the solar vaporization chamber includes a solar panel, an insulating wall, an air-temperature vaporizer and a battery pack, the air-temperature vaporizer is connected between the low-temperature liquid reciprocating pump and the nitrogen buffer tank through a pipeline, the insulating wall surrounds the air-temperature vaporizer, and a plurality of electric heating tubes are installed on the insulating wall, the plurality of electric heating tubes are electrically connected to the solar panel and the battery pack, and the solar panel and the battery pack are configured to selectively supply power to the plurality of electric heating tubes.

[0014] In the above technical solution, it is further preferred that the battery pack is a storage battery, and the battery pack is electrically connected to the solar panel.

[0015] In the above technical solution, it is further preferred that a temperature transmitter is provided between the air-temperature vaporizer and the nitrogen buffer tank, and the temperature transmitter is controlled in linkage with the solar vaporization chamber.

[0016] In the above technical solution, it is further preferred that the set temperature of the temperature transmitter is 0°C.

[0017] In the above technical solution, it is further preferred that an intelligent pressure reducing valve, a third solenoid valve and a fourth solenoid valve are arranged on the main pipeline, the intelligent pressure reducing valve and the third solenoid valve are arranged between the nitrogen buffer tank and the pressure test system, and the third solenoid valve is used to control the fluid flow between the nitrogen buffer tank and the pressure test system; the fourth solenoid valve is arranged between the pressure test system and the exhaust port, and is used to control the fluid flow between the pressure test system and the exhaust port.

[0018] In the above technical solution, it is further preferred that each of the pressure test tubes is further provided with a third pressure transmitter, and the third pressure transmitter is linked and controlled with the third solenoid valve, the pressure relief solenoid valve of the safety system and the pressure test solenoid valve.

[0019] In the above technical solution, it is further preferred that each of the pressure test chambers is surrounded by a plurality of explosion-proof walls, and explosion-proof automatic doors are provided on the explosion-proof walls facing the automatic conveying system.

[0020] In the above technical solution, it is further preferred that each of the pressure test chambers is installed with automatic clamping tooling and monitoring equipment, the automatic clamping tooling is arranged at the pressure test tube, and is used to clamp the cryogenic gas cylinder in the corresponding pressure test chamber to connect with the pressure test tube, and the monitoring equipment and the nitrogen detector are installed on the explosion-proof wall.

[0021] In the above technical solution, it is further preferred that the control system includes a remote control terminal, and the remote control terminal includes a human-computer interaction interface.

[0022] Compared with the prior art, this application achieves the following beneficial effects:

[0023] The automatic assembly line of the present application is highly intelligent, and realizes remote automatic transportation of cryogenic gas cylinders for pressure testing through an automatic conveying system and a control system, thereby improving the accuracy and safety of the pressure test; a safety system is arranged between the pressure testing system and the exhaust port, and a plurality of safety branches with pressure test safety valves of different pressure levels are arranged in the safety system, which is suitable for pressure tests of different pressures and ensures safety and test efficiency during the pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of an automatic pressure test line provided in an embodiment of the present application;

[0025] Figure 2 for Figure 1 Process flow chart of pressure testing on the automatic assembly line;

[0026] Figure 3 for Figure 1 Schematic diagram of the structure of the solar vaporization chamber;

[0027] Figure 4 for Figure 1 A schematic structural diagram of the gas storage unit in FIG.

[0028] Figure 5 for Figure 1 Schematic diagram of the structure of the pressure test chamber;

[0029] Figure 6 for Figure 1 Schematic diagram of the safety system in .

[0030] Among them: 10, gas pipeline; 1, liquid nitrogen cryogenic storage tank; 2, cryogenic liquid reciprocating pump; 3, solar vaporization chamber; 31, solar panel; 32, insulation wall; 33, air-temperature vaporizer; 34, battery pack; 36, temperature transmitter; 4, gas storage unit; 41, nitrogen buffer tank; 42, second pressure transmitter; 5, main pipeline; 51, exhaust port; 52, intelligent pressure reducing valve; 53, third solenoid valve; 54, fourth solenoid valve; 11, first solenoid valve; 12, second solenoid valve; 13, first pressure transmitter ; 14. Safety pressure relief valve; 20. Pressure test system; 6. Pressure test chamber; 61. Pressure test pipe; 62. Pressure test solenoid valve; 63. Third pressure transmitter; 64. Explosion-proof wall; 65. Explosion-proof automatic door; 66. Automatic clamping tooling; 67. Monitoring equipment; 68. Nitrogen detector; 30. Safety system; 7. Safety branch; 71. Pressure test safety valve; 72. Pressure relief solenoid valve; 40. Automatic conveying system; 8. Automatic transport track; 81. Roller; 9. Transport robot; 60. Control system; 50. Cryogenic gas cylinder. DETAILED DESCRIPTION

[0031] In order to describe the technical content, structural features, achieved purposes and effects of the application in detail, the technical solutions in the embodiments of the application will be described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all of the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but are not necessarily exclusive. For example, without departing from the inventive concept, the specific shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0032] The present application provides an automatic pressure test assembly line for cryogenic gas cylinders. The pressure test is used to test the safety and air tightness of cryogenic gas cylinders and is somewhat dangerous. The automatic pressure test assembly line enables operators to remotely control the pressure test process in a safe environment, thereby improving the efficiency, accuracy and safety of the test.

[0033] like Figure 1 As shown, the pressure test automatic assembly line includes: a gas pipeline 10 for providing test gas, a pressure test system 20 for performing pressure test operations, a safety system 30 for providing pressure protection for the pressure test system 20, and an automatic conveying system 40 for providing low-temperature gas cylinders 50 for the pressure test system 20. The electronic equipment of the gas pipeline 10, the pressure test system 20, the safety system 30 and the automatic conveying system 40 are all connected to a control system 60, centrally controlled by the control system 60, and operate under the control of the control system 60.

[0034] The gas transmission pipeline 10 includes a liquid nitrogen cryogenic storage tank 1, a cryogenic liquid reciprocating pump 2, a solar vaporization chamber 3, and a gas storage unit 4, which are interconnected in sequence. Gaseous nitrogen is stored in the gas storage unit 4 and is used to provide stored nitrogen for the pressure test system 20. The outlet of the gas storage unit 4 is connected to one end of a main pipeline 5, the other end of which forms an exhaust port 51. The gas storage unit 4 supplies gas to the pressure test system 20 through the main pipeline 5, and the pressure test system 20 exhausts gas to the outside through the main pipeline 5 at the exhaust port 51.

[0035] A first pressure transmitter 13 is installed on the liquid nitrogen cryogenic storage tank 1. A first solenoid valve 11 and a second solenoid valve 12 are connected in parallel between the liquid nitrogen cryogenic storage tank 1 and the cryogenic liquid reciprocating pump 2. The first solenoid valve 11 connects the bottom of the liquid nitrogen cryogenic storage tank 1 to the cryogenic liquid reciprocating pump 2 via a pipeline, while the second solenoid valve 12 connects the top of the liquid nitrogen cryogenic storage tank 1 to the cryogenic liquid reciprocating pump 2 via a pipeline. The first pressure transmitter 13, the first solenoid valve 11, the second solenoid valve 12, and the cryogenic liquid reciprocating pump 2 are controlled in a coordinated manner. A safety pressure relief valve 14 is installed between the first solenoid valve 11 and the cryogenic liquid reciprocating pump 2. If the pressure in the pipeline containing the first solenoid valve 11 is too high, the safety pressure relief valve 14 opens, thereby ensuring the safety of the pipeline.

[0036] like Figure 1 、 2 As shown, when the cryogenic liquid reciprocating pump 2 is turned on, the first pressure transmitter 13 detects the pressure within the liquid nitrogen cryogenic storage tank 1. If the pressure within the tank is too high, the second solenoid valve 12 is preferentially opened, allowing the gaseous nitrogen in the upper portion of the tank to be transported downstream through the cryogenic liquid reciprocating pump 2. After the pressure within the tank drops to normal, the second solenoid valve 12 is closed and the first solenoid valve 11 is opened, allowing the liquid nitrogen in the lower portion of the tank to be transported downstream through the cryogenic liquid reciprocating pump 2. If the pressure within the tank is within the normal range, the first solenoid valve 11 is automatically opened. The parallel arrangement of the pipeline containing the first solenoid valve 11 and the pipeline containing the second solenoid valve 12 can effectively relieve the pressure of the liquid nitrogen cryogenic storage tank 1 and transport the released gaseous nitrogen to the gas transmission pipeline for utilization, achieving an economical and energy-saving effect.

[0037] like Figure 1 、 3 As shown, the solar vaporization chamber 3 includes a solar panel 31, an insulating wall 32, an air-temperature vaporizer 33, and a battery pack 34. The air-temperature vaporizer 33 is connected between the cryogenic liquid reciprocating pump 2 and the gas storage unit 4 via a pipeline. The insulating wall 32 surrounds the air-temperature vaporizer 33 and is equipped with several electric heating tubes. When the electric heating tubes are powered, the temperature within the space enclosed by the insulating wall 32 increases. The liquid nitrogen delivered by the cryogenic liquid reciprocating pump 2 is vaporized into gaseous nitrogen after heat exchange with the outside in the air-temperature vaporizer 33. The gaseous nitrogen is then delivered to the downstream gas storage unit 4. The insulating wall 32 provides a certain thermal insulation effect, preventing heat loss and saving energy.

[0038] Several electric heating tubes are electrically connected to a solar panel 31 and a battery pack 34. The solar panel 31 and the battery pack 34 are configured to selectively supply power to the heating tubes. The solar panel 31 is installed outdoors and generates electricity using solar energy. On sunny days, the heating tubes are powered by the solar panel 31, while on cloudy days, the heating tubes are powered by the battery pack 34. The battery pack 34 is a storage battery. In this embodiment, the battery pack 34 is electrically connected to the solar panel 31. On sunny days, the battery pack 34 stores excess electricity generated by the solar panel 31, thereby saving energy.

[0039] like Figure 1 、 4 As shown, the gas storage unit 4 includes a nitrogen buffer tank 41 and a second pressure transmitter 42 mounted on the nitrogen buffer tank 41. The nitrogen buffer tank 41 is used to store nitrogen to provide sufficient nitrogen to the downstream pressure test chambers 6. The second pressure transmitter 42 is linked to the cryogenic liquid reciprocating pump 2 for control. When the second pressure transmitter 42 detects that the pressure in the nitrogen buffer tank 41 is too low, the cryogenic liquid reciprocating pump 2 automatically starts to pump liquid nitrogen or gaseous nitrogen from the liquid nitrogen cryogenic storage tank 1 and transports the pumped liquid nitrogen or gaseous nitrogen to the solar vaporization chamber 3. The nitrogen buffer tank 41 is also equipped with a safety pressure relief valve 14. This safety pressure relief valve 14 is used to relieve pressure in the event of excessive pressure in the nitrogen buffer tank 41, thereby ensuring the safety of the gas transmission pipeline 10.

[0040] like Figure 1 、 2 As shown, a temperature transmitter 36 is provided between the air-temperature vaporizer 33 and the nitrogen buffer tank 41. The temperature transmitter 36 is controlled in conjunction with the solar vaporization chamber 3. The set temperature of the temperature transmitter 36 is 0°C. When the temperature transmitter 36 detects that the temperature of the vaporized gas is less than 0°C, the electric heating tube of the solar vaporization chamber 3 begins heating. When the temperature transmitter 36 detects that the temperature of the vaporized gas is greater than or equal to 0°C, the electric heating tube of the solar vaporization chamber 3 stops heating.

[0041] like Figure 1 、 5 As shown, the pressure test system 20 includes several pressure test chambers 6 arranged side by side from front to back. Several pressure test chambers 6 are connected in parallel between the gas storage unit 4 and the exhaust port 51. Each pressure test chamber 6 is configured to accommodate at least one cryogenic gas cylinder 50. Each pressure test chamber 6 is equipped with a pressure test tube 61 that can connect the main pipeline 5 and the cryogenic gas cylinder 50. Each pressure test tube 61 is also equipped with a pressure test solenoid valve 62 for controlling the flow of fluid in the pressure test tube 61. Each pressure test tube 61 is also equipped with a third pressure transmitter 63 for detecting the pressure at the corresponding pressure test tube 61.

[0042] The pressure test chamber 6 is surrounded by a plurality of explosion-proof walls 64, which are used to prevent the explosion of cryogenic gas cylinders inside the pressure test chamber 6 from affecting the external environment and the safety of personnel outside. An explosion-proof automatic door 65 is provided on the explosion-proof wall 64 facing the automatic conveyor system 40. This automatic door 65 can be opened and closed automatically under the control of the control system 60, without manual operation.

[0043] Each pressure test chamber 6 is also equipped with an automatic clamping fixture 66, monitoring equipment 67, and a nitrogen detector 68. The automatic clamping fixture 66 is placed at the corresponding pressure test tube 61 to clamp the cryogenic gas cylinder in the corresponding pressure test chamber 6 to the pressure test tube 61. The monitoring equipment 67 and nitrogen detector 68 are both installed on the explosion-proof wall 64. The monitoring equipment 67 is used to monitor the situation inside the pressure test chamber 6 in real time and transmit the information remotely to the monitoring room for real-time monitoring by the operator. The nitrogen detector 68 is used to detect whether there is any nitrogen leakage in the cryogenic gas cylinder in the corresponding pressure test chamber during the pressure test.

[0044] like Figure 1 、 6 As shown, the safety system 30 includes multiple safety branches 7 connected in parallel between the pressure test system 20 and the exhaust port 51. Both ends of each safety branch 7 are connected to the main pipeline 5, and one of the multiple safety branches 7 selectively connects the pressure test system 20 and the exhaust port 51. Each safety branch 7 includes a pressure test safety valve 71 and a pressure relief solenoid valve 72 for controlling the flow of fluid in the corresponding safety branch 7. The pressure test safety valves 71 of the multiple safety branches 7 have different pressure levels. When the pressure test system 20 is tested, the safety branch 7 containing the pressure test safety valve 71 corresponding to the test pressure of the pressure test system is connected, and the pressure relief solenoid valve 72 of this safety branch 7 is controlled to open, while the pressure relief solenoid valves 72 of the remaining safety branches 7 are closed. The multiple safety branches 7 of the safety system 30 are suitable for pressure tests of different pressure levels, ensuring that the pressure in each pressure test pipe does not exceed the limit and ensuring safety during the pressure test.

[0045] like Figure 1 As shown, an intelligent pressure reducing valve 52, a third solenoid valve 53 and a fourth solenoid valve 54 are arranged on the main pipeline 5. The intelligent pressure reducing valve 52 and the third solenoid valve 53 are arranged between the nitrogen buffer tank 41 and the pressure test system 20. The intelligent pressure reducing valve 52 can adjust the pressure of the main pipeline 5 to a preset pressure under the control of the control system. The third solenoid valve 53 is used to control the fluid connection between the nitrogen buffer tank 41 and the pressure test system 20; the fourth solenoid valve 54 is arranged between the pressure test system 20 and the exhaust port 51, and is used to control the fluid connection between the pressure test system 20 and the exhaust port 51. When the pressure test of the pressure test system 20 is completed, the fourth solenoid valve 54 is opened, so that all the gas in the cryogenic gas cylinder 50 in the pressure test chamber 6 is discharged from the exhaust port 51, and the cryogenic gas cylinder 50 that has completed the test can be safely removed from the pressure test chamber 6.

[0046] The third pressure transmitter 63 at each pressure test tube 61 is linked with the third solenoid valve 53, multiple pressure relief solenoid valves 72 and the corresponding pressure test solenoid valve 62 for control. The control system 60 controls the third solenoid valve 53, multiple pressure relief solenoid valves 72 and the corresponding pressure test solenoid valve 62 according to the pressure detected by the third pressure transmitter 63, thereby shortening the time for switching safety branches of different pressure levels and improving test efficiency.

[0047] The automatic transport system 40 is arranged on one side of several pressure test chambers 6. The automatic transport system 40 includes several automatic transport rails 8 arranged at intervals and transport robots 9 arranged between two adjacent automatic transport rails 8. Each automatic transport rail 8 extends in the front-to-back direction to automatically transport the cryogenic gas cylinders 50 in the front-to-back direction. Each transport robot 9 is used to automatically transport the cryogenic gas cylinders 50 between the automatic transport rail 8 and the pressure test chamber 6.

[0048] The automatic transport track 8 includes a plurality of rollers 81 and a conveying motor (not shown in the figure) that is transmission-connected to the plurality of rollers 81. The plurality of rollers 81 are arranged in sequence along the front-to-back direction. The conveying motor is used to drive the plurality of rollers 81 to rotate. The cryogenic gas cylinders 50 are placed on the plurality of rollers 81. When the conveying motor drives the plurality of rollers 81 to rotate, the cryogenic gas cylinders 50 placed thereon move along the front-to-back direction under the conveyance of the rollers 81.

[0049] The top of the transport robot 9 can carry the cryogenic gas cylinder 50, and a plurality of moving wheels (not shown in the figure) are installed on the bottom. The transport robot 9 can move in all directions through the moving wheels, thereby transferring the cryogenic gas cylinder 50 between the automatic transport track 8 and the pressure test chamber 6.

[0050] The transport robot 9 will also be equipped with a real-time detection device (not shown in the figure). The real-time detection device is used to detect the environment around the transport robot 9, so that the transport robot 9 moves according to the feedback of the real-time detection device to ensure that the transport direction of the transport robot 9 is accurate.

[0051] The control system includes a remote control terminal located in the monitoring room, and the remote control terminal includes a human-machine interface for the operator to interact with the control system. The operator can input instructions through the human-machine interface to remotely control the operation of the gas pipeline 10, the pressure test system 20, the safety system and the automatic conveying system 40. The operator can also view the status of each device through the human-machine interface and remotely monitor the pressure test conditions in each pressure test chamber 6.

[0052] like Figure 1 、 2As shown, the pressure test process of the present application is as follows: the control system 60 controls the automatic conveying system 40 according to the program to convey the cryogenic gas cylinders 50 of the previous process to each pressure test chamber 6 one by one, and each cryogenic gas cylinder 50 is connected to the corresponding pressure test tube 61 through the automatic clamping tool 66. The operator selects the test pressure through the human-machine interface. When the pressure of the gas storage unit 4 meets the gas supply, the third solenoid valve 53 is opened, the fourth solenoid valve 54 is closed, and the pressure test solenoid valve 62 on the pressure test tube 61 connected to the cryogenic gas cylinder 50 is opened. The nitrogen provided by the gas pipeline 10 enters the cryogenic gas cylinder 50 and slowly increases the pressure. When the third pressure transmitter 63 detects that the pressure has been increased to the test pressure, the corresponding pressure test solenoid valve 6 2 is closed to maintain the pressure of the cryogenic gas cylinder 50. When the cryogenic gas cylinders 50 in all the pressure test chambers 6 are maintaining the pressure, the third solenoid valve 53 is closed. After a period of pressure maintenance, if the nitrogen detector 68 in the pressure test chamber 6 does not detect any nitrogen leakage, and the operator does not find any change in the appearance of the cryogenic gas cylinder 50 through the remote control terminal, it is determined that the cryogenic gas cylinder 50 in the pressure test chamber 6 is qualified. The fourth solenoid valve 54 and the pressure test solenoid valve 62 of the qualified pressure test chamber 6 are opened, and the nitrogen in the cryogenic gas cylinder 50 is completely discharged from the exhaust port 51 through the main pipeline 5. The qualified cryogenic gas cylinder 50 is removed from the pressure test chamber 6, and the automatic conveying system 40 replenishes the cryogenic gas cylinder 50 for the next pressure test. If the nitrogen detector 68 in the pressure test chamber 6 detects a nitrogen leak, or the operator finds that the appearance of the cryogenic gas cylinder 50 has changed through the remote control terminal, the cryogenic gas cylinder 50 in the pressure test chamber 6 is determined to be unqualified. After the qualified cryogenic gas cylinder 50 is depressurized, the operator controls the safety system 30 through the remote control terminal to open the safety branch 7 corresponding to the test pressure, so that the unqualified cryogenic gas cylinder is depressurized to the safety detection pressure, so that the operator can arrive at the pressure test site, conduct further inspection on the unqualified cryogenic gas cylinder, mark the leakage point, and then control the unqualified cryogenic gas cylinder to depressurize through the control system, move it out of the pressure test chamber, and transport it to the repair station for repair. After the repair is completed, it is transported to the pressure test automatic assembly line for pressure testing.

[0053] When the pressure of the gas storage unit 4 does not meet the gas supply, the cryogenic liquid reciprocating pump 2 is turned on to pump the liquid nitrogen in the liquid nitrogen cryogenic storage tank 1 to the solar vaporization chamber 3. The liquid nitrogen is vaporized by heat exchange in the solar vaporization chamber 3, and the gaseous nitrogen enters the gas storage unit 4 and is stored in the nitrogen buffer tank 41. When the second pressure transmitter 42 detects that the pressure in the nitrogen buffer tank 41 meets the standard, the solar vaporization chamber 3 and the cryogenic liquid reciprocating pump 2 stop working, and the first solenoid valve 11 and the second solenoid valve 12 are both closed until the next nitrogen replenishment.

[0054] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments. The above embodiments and descriptions are only for illustrative purposes. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. The scope of protection claimed in the present application is defined by the appended claims, the description and their equivalents.

Claims

1. An automatic pressure test line for cryogenic gas cylinders, characterized in that: include: A gas transmission pipeline includes a liquid nitrogen cryogenic storage tank, a cryogenic liquid reciprocating pump, a solar vaporization chamber, and a gas storage unit that are sequentially connected, wherein the outlet of the gas storage unit is connected to one end of a main pipeline, and the other end of the main pipeline forms an exhaust port; A pressure test system comprising a plurality of pressure test chambers connected in parallel downstream of the gas storage unit, each of the pressure test chambers being configured to accommodate at least one cryogenic gas cylinder, and each of the pressure test chambers being equipped with a pressure test tube connecting the main pipeline and the corresponding cryogenic gas cylinder, and a nitrogen detector, each of the nitrogen detectors being configured to detect whether there is nitrogen leakage from the cryogenic gas cylinder in the corresponding pressure test chamber during a pressure test, and each of the pressure test tubes being equipped with a pressure test solenoid valve for controlling the flow of fluid in the pressure test tube; A safety system comprising a plurality of safety branches connected in parallel between the pressure test system and the exhaust port, wherein both ends of each safety branch are connected to the main pipeline and each safety branch comprises a pressure test safety valve and a pressure relief solenoid valve for controlling the flow of fluid in the corresponding safety branch. One of the plurality of safety branches is selectively connected between the pressure test system and the exhaust port, and the pressure ratings of the pressure test safety valves of the plurality of safety branches are different from each other. An automatic transport system is arranged on one side of the plurality of pressure test chambers, the automatic transport system comprising a plurality of spaced automatic transport rails and a transport robot arranged between two adjacent automatic transport rails, each of the automatic transport rails extending in a front-to-rear direction to transport the cryogenic gas cylinders in the front-to-rear direction, and each of the transport robots being used to transport the cryogenic gas cylinders between the automatic transport rails and the pressure test chambers; as well as The control system is signal-connected to the gas pipeline, the pressure test system, the safety system, and the electronic equipment of the automatic delivery system.

2. The automatic pressure test line according to claim 1, characterized in that: A first pressure transmitter is installed on the liquid nitrogen cryogenic storage tank, and a first solenoid valve and a second solenoid valve are provided in parallel between the liquid nitrogen cryogenic storage tank and the cryogenic liquid reciprocating pump. The first solenoid valve connects the bottom of the liquid nitrogen cryogenic storage tank with the cryogenic liquid reciprocating pump through a pipeline, and the second solenoid valve connects the top of the liquid nitrogen cryogenic storage tank with the cryogenic liquid reciprocating pump through a pipeline. The first pressure transmitter, the first solenoid valve, the second solenoid valve and the cryogenic liquid reciprocating pump are controlled in linkage.

3. The automatic pressure test line according to claim 2, characterized in that: The gas storage unit includes a nitrogen buffer tank and a second pressure transmitter installed on the nitrogen buffer tank. The second pressure transmitter is controlled in linkage with the cryogenic liquid reciprocating pump.

4. The automatic pressure test line according to claim 3, characterized in that: Safety pressure relief valves are installed on the nitrogen buffer tank and between the first solenoid valve and the cryogenic liquid reciprocating pump.

5. The automatic pressure test line according to claim 3, characterized in that: The solar vaporization chamber includes a solar panel, an insulating wall, an air-temperature vaporizer and a battery pack. The air-temperature vaporizer is connected to the low-temperature liquid reciprocating pump and the nitrogen buffer tank through a pipeline. The insulating wall surrounds the air-temperature vaporizer, and a plurality of electric heating tubes are installed on the insulating wall. The plurality of electric heating tubes are electrically connected to the solar panel and the battery pack. The solar panel and the battery pack are configured to selectively supply power to the plurality of electric heating tubes.

6. The automatic pressure test line according to claim 5, characterized in that: The battery pack is a storage battery, and the battery pack is electrically connected to the solar panel.

7. The automatic pressure test line according to claim 5, characterized in that: A temperature transmitter is provided between the air-temperature vaporizer and the nitrogen buffer tank, and the temperature transmitter is linked to the solar vaporization chamber for control.

8. The automatic pressure test line according to claim 7, characterized in that: The set temperature of the temperature transmitter is 0°C.

9. The automatic pressure test line according to claim 3, characterized in that: An intelligent pressure reducing valve, a third solenoid valve and a fourth solenoid valve are arranged on the main pipeline. The intelligent pressure reducing valve and the third solenoid valve are arranged between the nitrogen buffer tank and the pressure test system. The third solenoid valve is used to control the fluid flow between the nitrogen buffer tank and the pressure test system; the fourth solenoid valve is arranged between the pressure test system and the exhaust port, and is used to control the fluid flow between the pressure test system and the exhaust port.

10. The automatic pressure test line according to claim 9, characterized in that: Each of the pressure test tubes is further provided with a third pressure transmitter, and the third pressure transmitter is controlled in linkage with the third solenoid valve, the pressure relief solenoid valve of the safety system and the pressure test solenoid valve.

11. The automatic pressure test line according to claim 1, characterized in that: Each of the pressure test chambers is surrounded by a plurality of explosion-proof walls, and explosion-proof automatic doors are provided on the explosion-proof walls facing the automatic conveying system.

12. The automatic pressure test line according to claim 11, characterized in that: Each of the pressure test chambers is installed with automatic clamping tooling and monitoring equipment. The automatic clamping tooling is arranged at the pressure test tube and is used to clamp the low-temperature gas cylinder in the corresponding pressure test chamber to connect with the pressure test tube. The monitoring equipment and the nitrogen detector are installed on the explosion-proof wall.

13. The automatic pressure test line according to claim 1, characterized in that: The control system includes a remote control terminal, and the remote control terminal includes a human-computer interaction interface.

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