Double-end emergency cut-off system

Abstract

The invention belongs to the technical field of dangerous chemical loading and unloading safety, and particularly relates to a double-end emergency cut-off system suitable for a dangerous chemical tank car. The double-end emergency cut-off system comprises a first control valve and a second control valve which can be connected with each other, a first pressure source is connected with the control end of the first control valve through a first emergency stop switch, and a second pressure source is connected with the control end of the second control valve through a second emergency stop switch. The first control valve and the second control valve are both normally closed valves, and the emergency stop device is characterized in that after any one of the first emergency stop switch and the second emergency stop switch is closed, the first control valve and the second control valve are both closed.

Description

Technical Field

[0001] The present invention belongs to the technical field of hazardous chemical loading and unloading safety, and in particular relates to a double-end emergency shutoff system suitable for hazardous chemical tank trucks. Background Art

[0002] With the rapid growth of clean energy use, the amount of compressed natural gas (CNG), liquefied natural gas (LNG), high-pressure hydrogen, and liquid hydrogen transported by road has increased rapidly. The vehicles transporting these hazardous materials are typically high-pressure tube trucks or liquefied fuel tankers. Leakage, combustion, or explosions can have serious consequences.

[0003] The loading and unloading platform is the place where hazardous chemical tank trucks complete daily loading and unloading operations. Due to the large number of operations such as pipeline connection / disconnection and process valve opening / closing, various safety accidents are easily caused by operational errors.

[0004] To enable rapid emergency shutoff in the event of an abnormality during loading and unloading, loading and unloading facilities are typically equipped with emergency stop buttons. Tank trucks are typically equipped with compressed gas cylinders, emergency stop switches, and pneumatic emergency shutoff valves. The pneumatic emergency shutoff valves are typically air-to-open. Under normal circumstances, the tank truck's compressed gas cylinder supplies gas to the pneumatic emergency shutoff valve. Pressing the emergency stop switch shuts off the compressed gas cylinder, disconnecting the pneumatic emergency shutoff valve. The pneumatic emergency shutoff valve is typically installed in the tank truck's rear loading and unloading control box, on the inlet and outlet process pipelines. Once closed, it isolates the tank truck from the loading and unloading process facilities.

[0005] However, for hazardous chemical tanker systems equipped with onboard gas cylinders, shutting down both the loading and unloading process facilities and the vehicle's onboard pneumatic emergency shutoff valve in the event of an accident requires operating both the loading and unloading process facility's emergency stop switches and the vehicle's onboard emergency stop switches separately. This makes it highly unlikely that both the tanker and the loading and unloading process facilities can be shut down simultaneously in an accident.

[0006] For hazardous chemical tanker systems equipped with onboard gas cylinders, if the onboard gas cylinders are disconnected during loading and unloading, and the compressed air source provided by the loading and unloading process facilities is used, although the hazardous chemical tanker system can be simultaneously shut down when the emergency stop button of the loading and unloading process facilities is pressed, this method requires switching the compressed air source before each loading and unloading operation, which is relatively cumbersome. Furthermore, once the air source is switched to the loading and unloading process facilities, the hazardous chemical tanker's built-in emergency stop button will become ineffective. This means that during loading and unloading operations, transport personnel remaining near the hazardous chemical tanker will be unable to simultaneously shut down the tanker's inlet and outlet valves and the loading and unloading process facilities using the vehicle's own emergency shut-off system in the event of an accident.

[0007] Therefore, it is necessary to develop a double-end emergency shut-off system that can simultaneously cut off the vehicle-mounted emergency shut-off valve and the loading and unloading process facilities with one click, and this emergency shut-off system supports one-click shut-off regardless of whether it is operated from the emergency switch on the vehicle or the emergency switch of the loading and unloading process facilities. Summary of the Invention

[0008] In response to the above-mentioned technical problems, the present invention aims to provide a double-end emergency cut-off system, which can realize one-touch cut-off of any emergency switch on the vehicle and the loading and unloading process facilities.

[0009] According to the present invention, a double-end emergency shut-off system is provided, comprising a first control valve and a second control valve that can be connected to each other, a first pressure source being connected to the control end of the first control valve via a first emergency stop switch, and a second pressure source being connected to the control end of the second control valve via a second emergency stop switch, wherein both the first control valve and the second control valve are normally closed valves, and wherein when either the first emergency stop switch or the second emergency stop switch is closed, both the first control valve and the second control valve are closed.

[0010] In a specific embodiment provided according to the present invention, a third control valve is connected in series between the second control valve and the second pressure source, the third control valve is a normally closed valve, and the outlet end of the first emergency stop switch is connected to the control end of the third control valve.

[0011] In a specific embodiment provided according to the present invention, a branch is set between the second pressure source and the second emergency stop switch and is connected to the control end of the first control valve through a fourth control valve. The fourth control valve is a normally closed valve. A branch is set between the second emergency stop switch and the second control valve to connect the control end of the fourth control valve. A fifth control valve is connected in series between the first emergency stop switch and the first control valve. The fifth control valve is a normally open valve. A branch is set between the fourth control valve and the second pressure source to connect the control end of the fifth control valve.

[0012] In a specific embodiment provided according to the present invention, a sixth control valve is connected in series between the first emergency stop switch and the control end of the third control valve, the sixth control valve is a normally closed valve, and a branch is set between the fourth control valve and the second pressure source to connect the control end of the sixth control valve.

[0013] In a specific embodiment provided according to the present invention, the first control valve and the second control valve are connected via a mounting and dismounting interface.

[0014] In a specific embodiment provided according to the present invention, a branch provided between the second emergency stop switch and the second control valve is connected to the control end of the fourth control valve through a first interface.

[0015] In a specific embodiment provided according to the present invention, a second interface is provided between the sixth control valve and the control end of the third control valve.

[0016] In a specific embodiment provided according to the present invention, a third interface is provided between the inlet end of the fourth control valve and the second pressure source.

[0017] In a specific embodiment provided according to the present invention, the first control valve and the second control valve are connected to the first storage tank and the second storage tank respectively.

[0018] In a specific embodiment provided according to the present invention, the second pressure source is connected to the first pressure source through a fourth interface.

[0019] In a specific embodiment provided according to the present invention, a second air supply valve is connected in series between the second pressure source and the fourth interface, and a first air supply valve is connected in series between the first pressure source and the fourth interface.

[0020] In a specific embodiment provided by the present invention, a plurality of the first emergency stop switches are arranged in series.

[0021] In a specific embodiment provided by the present invention, a plurality of the second emergency stop switches are arranged in series.

[0022] Compared with the prior art, the advantages of this application are as follows.

[0023] The present invention adds new control valves, pipelines, and interfaces to the existing tank truck and loading and unloading facility. When only the first and second control valves are connected, and the first, second, and third interfaces are disconnected, the tank truck and loading and unloading facility can function normally. Therefore, the tank truck and loading and unloading facility of the present invention can be compatible with existing tank trucks or loading and unloading facilities.

[0024] When the first interface, the second interface and the third interface are connected, the first emergency stop switch of the tank truck can simultaneously control the closure of the first control valve of the tank truck and the second control valve of the loading and unloading facility, thereby realizing one-button cutting. At the same time, the second emergency stop switch of the loading and unloading facility can also simultaneously control the closure of the first control valve of the tank truck and the second control valve of the loading and unloading facility, thereby realizing one-button cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described below with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram showing a first embodiment of a double-ended emergency shut-off system according to the present invention is shown;

[0027] Figure 2 shows a schematic diagram of a second embodiment of a double-ended emergency shutdown system according to the present application;

[0028] Figure 3 shows a schematic diagram of a third embodiment of a double-ended emergency shutdown system according to the present application;

[0029] Figure 4 shows a schematic diagram of a fourth embodiment of a double-ended emergency shutdown system according to the present application;

[0030] Figure 5 shows a schematic diagram of a prior art tank truck and loading / unloading equipment shutdown system.

[0031] In the drawings:

[0032] 1, first pressure source; 10, first emergency stop switch; 11, first control valve; 12, fourth control valve; 13, fifth control valve; 14, sixth control valve; 2, second pressure source; 20, second emergency stop switch; 21, second control valve; 22, third control valve; 31, first interface; 32, second interface; 33, third interface; 34, fourth interface; 35, loading / unloading interface; 41, first air supply valve; 42, second air supply valve; 51, first storage tank; 52, second storage tank; 6, tank truck; 7, loading / unloading equipment; 8, valve; 100, double-ended emergency shutdown system.

[0033] In the present application, all the drawings are schematic drawings, only for illustrating the principles of the present application, and are not drawn in actual scale. DETAILED DESCRIPTION

[0034] The present application will be described below with reference to the drawings.

[0035] It should be noted that in the present application, the direction of fluid flow according to the present application is described as "upstream", "front end", "inlet end" or similar terms, while the direction of fluid flow is described as "downstream", "rear end", "outlet end" or similar terms.

[0036] It should be noted that in the present application, the control valve includes an inlet end, an outlet end and a control end. In the process of working, the control end of the control valve is connected with the pressure source, and the inlet end and the outlet end of the control valve are controlled by different pressures. When the pressure source connects the inlet end and the outlet end through the control end, the fluid can enter from the inlet end and flow out from the outlet end, so as to flow through the control valve. When the pressure source closes the inlet end and the outlet end through the control end, the fluid cannot flow through the control valve. The specific structure of the control valve is well known to those skilled in the art, and will not be described here.

[0037] In the prior art, the vehicle for transporting dangerous fluid is usually a high-pressure tube bundle vehicle or a liquefied tank vehicle, hereinafter collectively referred to as a tank truck 6. The tank truck 6 is connected with a loading and unloading device 7 so as to exchange fluid.

[0038] As shown in the prior art, the tank truck 6 comprises a first storage tank 51, a first control valve 11, a first pressure source 1 and a first emergency stop switch 10. Figure 5

[0039] The first storage tank 51 is used for storing fluid to be transported, and the specific features of the first storage tank 51 are well known to those skilled in the art and will not be described here.

[0040] The outlet of the first storage tank 51 is connected with the inlet end (or outlet end) of the first control valve 11 through a pipeline, and the outlet end (or inlet end) of the first control valve 11 is connected with the loading and unloading device 7 through a loading and unloading interface 35.

[0041] In this embodiment, the first pressure source 1 is a vehicle-mounted gas cylinder, and the downstream of the first pressure source 1 is connected with the first emergency stop switch 10 through a pipeline, and the downstream of the first emergency stop switch 10 is connected with the control end of the first control valve 11 through a pipeline.

[0042] The first control valve 11 is a normally closed valve. In this arrangement, when the first emergency stop switch 10 is closed, the pressure in the first pressure source 1 cannot be transmitted to the control end of the first control valve 11, and the inlet end and the outlet end of the first control valve 11 are in a closed state, thereby preventing the fluid in the first storage tank 51 from flowing out; when the first emergency stop switch 10 is opened, the pressure in the first pressure source 1 is transmitted to the control end of the first control valve 11, so that the inlet end and the outlet end of the first control valve 11 are in a communication state, thereby enabling the fluid in the first storage tank 51 to flow out and exchange with the loading and unloading device 7.

[0043] The loading and unloading device 7 comprises a second storage tank 52, a second pressure source 2, a second emergency stop switch 20 and a second control valve 21.

[0044] The second storage tank 52 is used for storing transported fluid, and the specific features of the second storage tank 52 are well known to those skilled in the art and will not be described here.

[0045] The outlet of the second storage tank 52 is connected with the outlet end (or inlet end) of the second control valve 21 through a pipeline, and the inlet end (or outlet end) of the second control valve 21 is connected with the first control valve 11 of the tank truck 6 through the loading and unloading interface 35.

[0046] In this embodiment, the second pressure source 2 is a compressed air interface in the loading and unloading device 7, the downstream of the second pressure source 2 is connected with the second emergency stop switch 20 through a pipeline, and the downstream of the second emergency stop switch 20 is connected with the control end of the second control valve 21 through a pipeline. ​

[0047] The second control valve 21 is a normally closed valve. In this configuration, when the second emergency stop switch 20 is closed, the pressure within the second pressure source 2 cannot be transmitted to the control end of the second control valve 21, and the inlet and outlet of the second control valve 21 are sealed, thereby preventing the fluid in the second storage tank 52 from flowing out. When the second emergency stop switch 20 is opened, the pressure within the second pressure source 2 is transmitted to the control end of the second control valve 21, connecting the inlet and outlet of the second control valve 21, thereby enabling fluid exchange between the second storage tank 52 and the tank truck 6.

[0048] It can be seen that in the prior art, the first emergency stop switch 10 can only control the opening and closing of the first control valve 11 , and the second emergency stop switch 20 can only control the opening and closing of the second control valve 21 .

[0049] It is easy to understand that in the present application, a normally open valve refers to a control valve that remains open when the control end is not under pressure and remains closed when pressure is applied to the control end. Since the first pressure source 1 and the second pressure source 2 of the present application are both compressed gases, the normally open valve is specifically an air-off valve. A normally closed valve refers to a control valve that remains closed when the control end is not under pressure and remains open when pressure is applied to the control end. Since the first pressure source 1 and the second pressure source 2 of the present application are both compressed gases, the normally closed valve is specifically an air-open valve.

[0050] Example 1:

[0051] Figure 1 FIG. 1 shows the structure of a double-ended emergency shutoff system 100 according to the present invention. Figure 1 As shown, this embodiment adds pipelines and control valves on the basis of the existing shut-off system. Under the premise of maintaining the original functions, after either the first emergency stop switch 10 or the second emergency stop switch 20 is opened or closed, the first control valve 11 and the second control valve 21 can be controlled to close at the same time.

[0052] Specifically, a third control valve 22 is connected in series between the second control valve 21 and the second pressure source 2, and the downstream of the first emergency stop switch 10 is connected to the control end of the third control valve 22. Furthermore, in this embodiment, the third control valve 22 is arranged in series on the pipeline downstream of the second emergency stop switch 20. The third control valve 22 is a normally closed valve, that is, when the control end of the third control valve 22 is not subjected to pressure, the inlet and outlet ends of the third control valve 22 are in a closed state. Under this setting, when the first emergency stop switch 10 and the second emergency stop switch 20 are turned on, the pressure of the first pressure source 1 can be transmitted to the control end of the third control valve 22, thereby opening the third control valve 22. At this time, the pressure of the second pressure source 2 can be transmitted to the control end of the second control valve 21 through the second emergency stop switch 20 and the third control valve 22, thereby keeping the second control valve 21 in an open state. When the first emergency stop switch 10 is closed and the second emergency stop switch 20 is open, the pressure from the first pressure source 1 cannot be transmitted to the third control valve 22, thereby closing the third control valve 22. At this time, the pressure from the second pressure source 2 cannot be transmitted to the second control valve 21, thereby closing the second control valve 21. The above analysis shows that after the first emergency stop switch 10 in this embodiment is closed, both the first control valve 11 and the second control valve 21 can be closed.

[0053] In a specific embodiment, the control end of the third control valve 22 is connected to the downstream of the first emergency stop switch 10 via a second interface 32. This arrangement facilitates connection and disconnection between the tank truck 6 and the loading and unloading equipment 7.

[0054] Furthermore, a sixth control valve 14 is connected in series between the downstream of the first emergency stop switch 10 and the second interface 32, and the control end of the sixth control valve 14 is connected to the outlet of the second pressure source 2. Specifically, the sixth control valve 14 is a normally closed valve, and a branch is provided between the second emergency stop switch 20 and the second pressure source 2 to connect to the control end of the sixth control valve 14.

[0055] Furthermore, the control end of the sixth control valve 14 is connected to the outlet of the second pressure source 2 via the third interface 33 .

[0056] Under the above configuration, after the tank truck 6 and the loading and unloading equipment 7 are connected via the second interface 32 and the third interface 33, the pressure within the second pressure source 2 can be transmitted to the control end of the sixth control valve 14 via the third interface 33, thereby connecting the inlet and outlet of the sixth control valve 14. At this time, the pressure of the first pressure source 1 can be transmitted to the control end of the third control valve 22 via the first emergency stop switch 10, the sixth control valve 14, and the second interface 32, thereby connecting the inlet and outlet of the third control valve 22. Furthermore, the pressure within the second pressure source 2 can be transmitted to the control end of the second control valve 21 via the second emergency stop switch 20 and the third control valve 22, thereby opening the second control valve 21 and facilitating fluid exchange between the second storage tank 52 and the first storage tank 51.

[0057] When the second interface 32 and the third interface 33 between the tank truck 6 and the loading and unloading equipment 7 are disconnected, the control end of the sixth control valve 14 is no longer subjected to the pressure of the second pressure source 2, so the sixth control valve 14 is closed, thereby preventing the pressure in the first pressure source 1 from leaking through the disconnected second interface 32.

[0058] According to the present invention, a branch is provided between the third port 33 and the sixth control valve 14 and is connected to the control end of the first control valve 11 through the fourth control valve 12. The fourth control valve 12 is a normally closed valve. When the control end of the fourth control valve 12 is not under pressure, the fourth control valve 12 remains closed. A branch is provided between the second emergency stop switch 20 and the second control valve 21 and is connected to the control end of the fourth control valve 12 through the first port 31.

[0059] Under the above configuration, when the tank truck 6 and the loading and unloading equipment 7 are not connected via the third interface 33 and the first interface 31, the control end of the fourth control valve 12 will not be subjected to pressure from the second pressure source 2, and thus the fourth control valve 12 will remain closed, and the pressure within the first pressure source 1 will not leak from the disconnected third interface 33 along the pipeline through the fourth control valve 12. When the tank truck 6 and the loading and unloading equipment 7 are connected via the third interface 33 and the first interface 31, the control end of the fourth control valve 12 will be subjected to pressure from the second pressure source 2, and thus the fourth control valve 12 will remain closed. At this time, the pressure from the second pressure source 2 can be transmitted to the control end of the first control valve 11 through the fourth control valve 12, causing the first control valve 11 to remain open.

[0060] Furthermore, a fifth control valve 13 is provided between the first emergency stop switch 10 and the first control valve 11. The fifth control valve 13 is a normally open valve. A branch is provided between the third interface 33 and the fourth control valve 12 to connect to the control end of the fifth control valve 13.

[0061] Under the above configuration, when the tank truck 6 and the loading and unloading equipment 7 are not connected via the third interface 33 and the first interface 31, the control end of the fifth control valve 13 and the control end of the fourth control valve 12 are not subject to pressure from the second pressure source 2. In this case, the fifth control valve 13 remains open and the fourth control valve 12 remains closed. If the first emergency stop switch 10 is on, the pressure from the first pressure source 1 can be transmitted to the control end of the first control valve 11 through the first emergency stop switch 10 and the fifth control valve 13 in sequence, causing the first control valve 11 to open normally. If the first emergency stop switch 10 is off, the pressure from the first pressure source 1 cannot be transmitted to the control end of the first control valve 11, causing the first control valve 11 to remain closed.

[0062] When the tank truck 6 and the loading and unloading equipment 7 are connected via the third interface 33 and the first interface 31, the control end of the fifth control valve 13 and the control end of the fourth control valve 12 are both subjected to pressure from the second pressure source 2. At this time, the fifth control valve 13 remains closed, and the fourth control valve 12 remains open. Therefore, at this time, the pressure of the first pressure source 1 cannot be transmitted to the control end of the first control valve 11, while the pressure of the second pressure source 2 can be transmitted to the control end of the first control valve 11 through the fourth control valve 12. When the second emergency stop switch 20 is closed, the pressure of the second pressure source 2 cannot be transmitted to the control end of the fourth control valve 12, causing the fourth control valve 12 to close, and further causing the second pressure source 2 to be unable to transmit the pressure to the control valve of the first control valve 11, causing the first control valve 11 to close.

[0063] Furthermore, a branch provided between the second emergency stop switch 20 and the second control valve 21 for connecting to the control end of the fourth control valve 12 is located downstream of the third control valve 22 .

[0064] The working principle of the present invention is as follows.

[0065] When the tank truck 6 and the loading and unloading equipment 7 are not connected via the first interface 31 , the second interface 32 and the third interface 33 , the working principle of the tank truck 6 is as follows.

[0066] When the first emergency stop switch 10 is on, the control end of the fifth control valve 13 is protected from external pressure. Since the fifth control valve 13 is a normally open valve and is in an open state, the pressure from the first pressure source 1 can be transmitted sequentially through the first emergency stop switch 10 and the fifth control valve 13 to the control end of the first control valve 11, thereby opening the first control valve 11 and enabling fluid exchange between the first storage tank 51 and the outside world. The control end of the sixth control valve 14 is protected from external pressure. Since the sixth control valve 14 is a normally closed valve and is in a closed state, the pressure within the first pressure source 1 will not leak from the second port 32 through the sixth control valve 14. The control end of the fourth control valve 12 is protected from external pressure. Since the fourth control valve 12 is a normally closed valve and is in a closed state, the pressure within the first pressure source 1 will not leak from the third port 33 through the fourth control valve 12. When the first emergency stop switch 10 is off, the first control valve 11 is closed.

[0067] When the tank truck 6 and the loading and unloading equipment 7 are not connected via the first interface 31 , the second interface 32 and the third interface 33 , the working principle of the loading and unloading equipment 7 is as follows.

[0068] A valve 8 is installed at the outlet of the second pressure source 2, upstream of the second emergency stop switch 20 and the third port 33. The control end of the third control valve 22 is not subject to external pressure. Since it is a normally closed valve, it is currently closed. Valve 8 remains closed to prevent pressure leakage from the second pressure source 2. The control end of the second control valve 21 is not subject to pressure. Since it is a normally closed valve, it is currently closed to prevent fluid leakage from the second storage tank 52.

[0069] When the tank truck 6 and the loading and unloading equipment 7 are not connected via the first interface 31 , the second interface 32 and the third interface 33 , the working principles of the tank truck 6 and the loading and unloading equipment 7 are as follows.

[0070] Under normal working conditions, when the valve 8, the first emergency stop switch 10 and the second emergency stop switch 20 are all open, the pressure of the second pressure source 2 can be transmitted to the control end of the fifth control valve 13 through the valve 8 and the third interface 33 in sequence. Since the fifth control valve 13 is a normally open valve, the fifth control valve 13 is in a closed state at this time. At this time, the pressure of the first pressure source 1 cannot be transmitted to the control end of the first control valve 11. In other words, at this time, the first control valve 11 is not directly affected by the pressure of the first pressure source 1.

[0071] The pressure from the second pressure source 2 can be transmitted sequentially through the valve 8 and the third interface 33 to the control end of the sixth control valve 14. Since the sixth control valve 14 is a normally closed valve, the sixth control valve 14 is now open. The pressure from the first pressure source 1 can be transmitted sequentially through the first emergency stop switch 10, the sixth control valve 14, and the second interface 32 to the third control valve 22. Since the third control valve 22 is a normally closed valve, the third control valve 22 is now open.

[0072] The pressure of the second pressure source 2 can be transmitted to the control end of the second control valve 21 through the valve 8, the second emergency stop switch 20 and the third control valve 22. Since the second control valve 21 is a normally closed valve, the second control valve 21 is in the open state at this time, and the second storage tank 52 can exchange fluid with the outside world through the second control valve 21.

[0073] The pressure of the second pressure source 2 can be transmitted to the control end of the fourth control valve 12 through the valve 8, the second emergency stop switch 20 and the third control valve 22. Since the fourth control valve 12 is a normally closed valve, the fourth control valve 12 is in the open state at this time.

[0074] The pressure of the second pressure source 2 can be transmitted to the control end of the first control valve 11 through the valve 8, the third interface 33 and the fourth control valve 12 in sequence. Since the first control valve 11 is a normally closed valve, the first control valve 11 is in the open state at this time, and the first storage tank 51 can exchange fluid with the second storage tank 52 through the first control valve 11, the loading and unloading interface 35 and the second control valve 21.

[0075] Under normal working conditions, after the first emergency stop switch 10 is closed, the control end of the third control valve 22 loses the pressure from the first pressure source 1, so the third control valve 22 is closed. After the third control valve 22 is closed, the pressure of the second pressure source 2 cannot be transmitted to the second control valve 21 and the fourth control valve 12, so the second control valve 21 and the fourth control valve 12 are closed. After the fourth control valve 12 is closed, the pressure of the second pressure source 2 cannot be transmitted to the first control valve 11, thereby closing the first control valve 11. Through the above analysis, it can be seen that after the first emergency stop switch 10 is closed, the first control valve 11 and the second control valve 21 can both be closed, thereby realizing the double-end automatic interlocking of the tank truck 6 and the loading and unloading equipment 7.

[0076] Under normal operating conditions, after closing the second emergency stop switch 20, the control ends of the second control valve 21 and the fourth control valve 12 lose pressure from the second pressure source 2, causing the second and fourth control valves 21 and 12 to close. After closing the fourth control valve 12, the control end of the first control valve 11 loses pressure from the second pressure source 2, causing the first control valve 11 to close. The above analysis demonstrates that after closing the second emergency stop switch 20, both the first and second control valves 11 and 21 can close, thereby achieving a two-way automatic interlock between the tank truck 6 and the loading and unloading equipment 7.

[0077] In a preferred embodiment, the present invention further comprises a plurality of pressure gauges, which are distributed on various pipelines for measuring the pressure in the pipelines.

[0078] Specifically, to prevent the compressed air pressure from being too low to drive the control valve to open, a pressure gauge is installed at the outlet of valve 8 and the control end of the third control valve 22. After the tank truck 6 and the loading and unloading equipment 7 are connected, the pressure gauge at the outlet of valve 8 is first self-checked to determine whether the pressure is greater than the threshold for normal opening and closing of the control valve. If it is less, an alarm is issued, indicating that the compressed air pressure of the second pressure source 2 is low. Then, the pressure gauge at the control end of the third control valve 22 is self-checked to determine whether the pressure is greater than the threshold for normal opening and closing of the control valve. If it is less, an alarm is issued, indicating that the compressed air pressure of the first pressure source 1 is low and air replenishment should be performed.

[0079] In a preferred embodiment, a pressure gauge is provided at the loading and unloading interface 35. After the cut-off interlock is completed, the cut-off confirmation can be performed through the pressure gauge data at the import and export loading and unloading interface 35. If the pressure gauge values ​​are all less than a certain threshold, the cut-off is successful. Otherwise, it is prompted to repeat the operation of the cut-off switch.

[0080] Example 2:

[0081] The double-end emergency shut-off system 100 includes a first control valve 11 and a second control valve 21 that can be connected to each other. The first pressure source 1 is connected to the control end of the first control valve 11 through a first emergency stop switch 10, and the second pressure source 2 is connected to the control end of the second control valve 21 through a second emergency stop switch 20. The first control valve 11 and the second control valve 21 are both normally closed valves, and are characterized in that when either the first emergency stop switch 10 or the second emergency stop switch 20 is closed, the first control valve 11 and the second control valve 21 are both closed.

[0082] A third control valve 22 is connected in series between the second control valve 21 and the second pressure source 2 . The third control valve 22 is a normally closed valve. The outlet end of the first emergency stop switch 10 is connected to the control end of the third control valve 22 .

[0083] A branch is provided between the second pressure source 2 and the second emergency stop switch 20 and is connected to the control end of the first control valve 11 through the fourth control valve 12, the fourth control valve 12 being a normally closed valve, a branch is provided between the second emergency stop switch 20 and the second control valve 21 and is connected to the control end of the fourth control valve 12, and the fifth control valve 13 is connected in series between the first emergency stop switch 10 and the first control valve 11, the fifth control valve 13 being a normally open valve, and a branch is provided between the fourth control valve 12 and the second pressure source 2 and is connected to the control end of the fifth control valve 13.

[0084] The sixth control valve 14 is connected in series between the first emergency stop switch 10 and the control end of the third control valve 22, the sixth control valve 14 being a normally closed valve, and a branch is provided between the fourth control valve 12 and the second pressure source 2 and is connected to the control end of the sixth control valve 14.

[0085] The first control valve 11 and the second control valve 21 are connected through the detachable interface 35.

[0086] The branch provided between the second emergency stop switch 20 and the second control valve 21 is connected to the control end of the fourth control valve 12 through the first interface 31.

[0087] The sixth control valve 14 and the control end of the third control valve 22 are provided with the second interface 32.

[0088] The third interface 33 is provided between the inlet end of the fourth control valve 12 and the second pressure source 2.

[0089] The first control valve 11 and the second control valve 21 are respectively connected with the first storage tank 51 and the second storage tank 52.

[0090] The above structure can be specifically referred to Example One.

[0091] In a preferred embodiment, as shown in Figure 2 The second pressure source 2 is connected with the first pressure source 1 through the fourth interface 34.

[0092] Specifically, the outlet of the second pressure source 2 is connected with the outlet of the first pressure source 1 through a pipeline, and in this arrangement, the second pressure source 2 can supplement the pressure of the first pressure source 1.

[0093] Further, the second air supplement valve 42 is connected in series between the second pressure source 2 and the fourth interface 34, and the first air supplement valve 41 is connected in series between the first pressure source 1 and the fourth interface 34. When the fourth interface 34 is disconnected, the first air supplement valve 41 and the second air supplement valve 42 are closed, which can prevent the pressure in the first pressure source 1 and the second pressure source 2 from leaking.

[0094] Example Three:

[0095] The double-end emergency cut-off system 100 comprises a first control valve 11 and a second control valve 21 capable of being connected to each other, a first pressure source 1 connected to a control end of the first control valve 11 through a first emergency stop switch 10, and a second pressure source 2 connected to a control end of the second control valve 21 through a second emergency stop switch 20, wherein the first control valve 11 and the second control valve 21 are both normally closed valves, and wherein the first control valve 11 and the second control valve 21 are both closed when any one of the first emergency stop switch 10 and the second emergency stop switch 20 is closed.

[0096] A third control valve 22 is connected in series between the second control valve 21 and the second pressure source 2, wherein the third control valve 22 is a normally closed valve, and an outlet end of the first emergency stop switch 10 is connected to a control end of the third control valve 22.

[0097] A branch is provided between the second pressure source 2 and the second emergency stop switch 20 and connected to the control end of the first control valve 11 through a fourth control valve 12, wherein the fourth control valve 12 is a normally closed valve, a control end of the fourth control valve 12 is connected through a branch between the second emergency stop switch 20 and the second control valve 21, a fifth control valve 13 is connected in series between the first emergency stop switch 10 and the first control valve 11, wherein the fifth control valve 13 is a normally open valve, and a control end of the fifth control valve 13 is connected through a branch between the fourth control valve 12 and the second pressure source 2.

[0098] A sixth control valve 14 is connected in series between the first emergency stop switch 10 and the control end of the third control valve 22, wherein the sixth control valve 14 is a normally closed valve, and a control end of the sixth control valve 14 is connected through a branch between the fourth control valve 12 and the second pressure source 2.

[0099] The first control valve 11 and the second control valve 21 are connected through a detachable interface 35.

[0100] The branch provided between the second emergency stop switch 20 and the second control valve 21 is connected to the control end of the fourth control valve 12 through a first interface 31.

[0101] The sixth control valve 14 and the control end of the third control valve 22 are provided with a second interface 32.

[0102] The fourth control valve 12 and the second pressure source 2 are provided with a third interface 33.

[0103] The first control valve 11 and the second control valve 21 are respectively connected to a first storage tank 51 and a second storage tank 52.

[0104] In a preferred embodiment, as shown in Figure 2 the second pressure source 2 is connected to the first pressure source 1 through a fourth interface 34.

[0105] Specifically, the outlet of the second pressure source 2 is connected to the outlet of the first pressure source 1 through a pipeline. Under this setting, the second pressure source 2 can supplement the pressure of the first pressure source 1.

[0106] Furthermore, a second air supply valve 42 is connected in series between the second pressure source 2 and the fourth interface 34, and a first air supply valve 41 is connected in series between the first pressure source 1 and the fourth interface 34. When the fourth interface 34 is disconnected, the first air supply valve 41 and the second air supply valve 42 are closed to prevent pressure leakage in the first pressure source 1 and the second pressure source 2.

[0107] The above structure may be specifically described in Example 1 and Example 2.

[0108] In a preferred embodiment, Figure 3 As shown, multiple first emergency stop switches 10 are arranged in series, and the multiple first emergency stop switches 10 are respectively arranged at various positions of the tank truck 6 by extending the pipeline. In this arrangement, staff may be on duty at various positions around the tank truck 6, and in an abnormal situation, they can operate any switch to achieve a double-end emergency interlock.

[0109] Example 4:

[0110] The double-end emergency shut-off system 100 includes a first control valve 11 and a second control valve 21 that can be connected to each other. The first pressure source 1 is connected to the control end of the first control valve 11 through a first emergency stop switch 10, and the second pressure source 2 is connected to the control end of the second control valve 21 through a second emergency stop switch 20. The first control valve 11 and the second control valve 21 are both normally closed valves, and are characterized in that when either the first emergency stop switch 10 or the second emergency stop switch 20 is closed, the first control valve 11 and the second control valve 21 are both closed.

[0111] A third control valve 22 is connected in series between the second control valve 21 and the second pressure source 2 . The third control valve 22 is a normally closed valve. The outlet end of the first emergency stop switch 10 is connected to the control end of the third control valve 22 .

[0112] A branch is set between the second pressure source 2 and the second emergency stop switch 20 and is connected to the control end of the first control valve 11 through the fourth control valve 12. The fourth control valve 12 is a normally closed valve. A branch is set between the second emergency stop switch 20 and the second control valve 21 to connect the control end of the fourth control valve 12. A fifth control valve 13 is connected in series between the first emergency stop switch 10 and the first control valve 11. The fifth control valve 13 is a normally open valve. A branch is set between the fourth control valve 12 and the second pressure source 2 to connect the control end of the fifth control valve 13.

[0113] The sixth control valve 14 is connected in series between the first emergency stop switch 10 and the control end of the third control valve 22, and is a normally closed valve. The control end of the sixth control valve 14 is connected to the fourth control valve 12 through a branch circuit between the fourth control valve 12 and the second pressure source 2.

[0114] The first control valve 11 is connected to the second control valve 21 through a detachable interface 35.

[0115] The control end of the fourth control valve 12 is connected to the second emergency stop switch 20 and the second control valve 21 through a branch circuit and a first interface 31.

[0116] The second interface 32 is connected between the sixth control valve 14 and the control end of the third control valve 22.

[0117] The third interface 33 is connected between the fourth control valve 12 and the second pressure source 2.

[0118] The first control valve 11 and the second control valve 21 are respectively connected to the first storage tank 51 and the second storage tank 52.

[0119] In a preferred embodiment, as shown in Figure 2 the fourth interface 34 is connected between the second pressure source 2 and the first pressure source 1.

[0120] Specifically, the outlet of the second pressure source 2 is connected to the outlet of the first pressure source 1 through a pipeline. In this arrangement, the second pressure source 2 can supplement the pressure of the first pressure source 1.

[0121] Further, the second air supplement valve 42 is connected in series between the second pressure source 2 and the fourth interface 34, and the first air supplement valve 41 is connected in series between the first pressure source 1 and the fourth interface 34. When the fourth interface 34 is disconnected, the first air supplement valve 41 and the second air supplement valve 42 are closed, which can prevent the pressure in the first pressure source 1 and the second pressure source 2 from leaking.

[0122] The above structure can be specifically referred to in Embodiment One and Embodiment Two.

[0123] In a preferred embodiment, a plurality of second emergency stop switches 20 are connected in series, and are respectively arranged at different positions of the loading and unloading device 7 through an extension pipeline. In this arrangement, the workers can be stationed at different positions around the loading and unloading device 7, which facilitates the operation of any switch in the event of an abnormal situation, thereby achieving double-end emergency interlocking.

[0124] Embodiment Five:

[0125] The double-end emergency shut-off system 100 includes a first control valve 11 and a second control valve 21 that can be connected to each other. The first pressure source 1 is connected to the control end of the first control valve 11 through a first emergency stop switch 10, and the second pressure source 2 is connected to the control end of the second control valve 21 through a second emergency stop switch 20. The first control valve 11 and the second control valve 21 are both normally closed valves, and are characterized in that when either the first emergency stop switch 10 or the second emergency stop switch 20 is closed, the first control valve 11 and the second control valve 21 are both closed.

[0126] A third control valve 22 is connected in series between the second control valve 21 and the second pressure source 2 . The third control valve 22 is a normally closed valve. The outlet end of the first emergency stop switch 10 is connected to the control end of the third control valve 22 .

[0127] A branch is set between the second pressure source 2 and the second emergency stop switch 20 and is connected to the control end of the first control valve 11 through the fourth control valve 12. The fourth control valve 12 is a normally closed valve. A branch is set between the second emergency stop switch 20 and the second control valve 21 to connect the control end of the fourth control valve 12. A fifth control valve 13 is connected in series between the first emergency stop switch 10 and the first control valve 11. The fifth control valve 13 is a normally open valve. A branch is set between the fourth control valve 12 and the second pressure source 2 to connect the control end of the fifth control valve 13.

[0128] A sixth control valve 14 is connected in series between the first emergency stop switch 10 and the control end of the third control valve 22 . The sixth control valve 14 is a normally closed valve. A branch is provided between the fourth control valve 12 and the second pressure source 2 to connect the control end of the sixth control valve 14 .

[0129] The first control valve 11 and the second control valve 21 are connected via a mounting and dismounting interface 35 .

[0130] The branch provided between the second emergency stop switch 20 and the second control valve 21 is connected to the control end of the fourth control valve 12 through the first interface 31 .

[0131] A second interface 32 is provided between the sixth control valve 14 and the control end of the third control valve 22 .

[0132] A third interface 33 is provided between the inlet end of the fourth control valve 12 and the second pressure source 2 .

[0133] The first control valve 11 and the second control valve 21 are connected to the first storage tank 51 and the second storage tank 52 respectively.

[0134] In a preferred embodiment, Figure 2 As shown, the second pressure source 2 is connected to the first pressure source 1 via a fourth port 34 .

[0135] Specifically, the outlet of the second pressure source 2 is connected to the outlet of the first pressure source 1 through a pipeline. Under this setting, the second pressure source 2 can supplement the pressure of the first pressure source 1.

[0136] Furthermore, a second air supply valve 42 is connected in series between the second pressure source 2 and the fourth interface 34, and a first air supply valve 41 is connected in series between the first pressure source 1 and the fourth interface 34. When the fourth interface 34 is disconnected, the first air supply valve 41 and the second air supply valve 42 are closed to prevent pressure leakage in the first pressure source 1 and the second pressure source 2.

[0137] The above structure may be specifically described in Example 1 and Example 2.

[0138] like Figure 4 As shown, in this embodiment, the first pressure source 1 may not be provided in the tank truck 6 , and the second pressure source 2 is connected to the original first pressure source 1 via the fourth interface 34 , so that the second pressure source 2 replaces the first pressure source 1 .

[0139] Example 6:

[0140] On the basis of any one of the embodiments from the first to the fifth, the first emergency stop switch 10 and the second emergency stop switch 20 may use manual and electrically controlled dual-purpose valves, and a concentration detector and a temperature sensor may be provided near the loading and unloading interface 35 to monitor abnormal leakage of hazardous chemicals. When, during the loading and unloading process, it is discovered that the pressure near the loading and unloading interface 35 suddenly drops sharply, the concentration of combustible gas exceeds the threshold, the surrounding temperature drops sharply, etc., the first emergency stop switch 10 and / or the second emergency stop switch 20 may be directly cut off by remote operation, thereby achieving an emergency stop on both ends.

[0141] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0142] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0143] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0144] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A double-end emergency shutoff system, comprising a first control valve (11) and a second control valve (21) that can be connected to each other, wherein a first pressure source (1) is connected to the control end of the first control valve (11) via a first emergency stop switch (10), and a second pressure source (2) is connected to the control end of the second control valve (21) via a second emergency stop switch (20), wherein both the first control valve (11) and the second control valve (21) are normally closed valves, characterized in that: After either the first emergency stop switch (10) or the second emergency stop switch (20) is closed, both the first control valve (11) and the second control valve (21) are closed.

2. The double-ended emergency shutoff system according to claim 1, characterized in that: A third control valve (22) is connected in series between the second control valve (21) and the second pressure source (2). The third control valve (22) is a normally closed valve. The outlet end of the first emergency stop switch (10) is connected to the control end of the third control valve (22).

3. The double-ended emergency shutoff system according to claim 2, characterized in that: A branch is provided between the second pressure source (2) and the second emergency stop switch (20) and is connected to the control end of the first control valve (11) through a fourth control valve (12), the fourth control valve (12) being a normally closed valve, and a branch is provided between the second emergency stop switch (20) and the second control valve (21) to connect to the control end of the fourth control valve (12). A fifth control valve (13) is connected in series between the first emergency stop switch (10) and the first control valve (11), and the fifth control valve (13) is a normally open valve. A branch is provided between the fourth control valve (12) and the second pressure source (2) to connect the control end of the fifth control valve (13).

4. The double-ended emergency shutoff system according to claim 3, characterized in that: A sixth control valve (14) is connected in series between the first emergency stop switch (10) and the control end of the third control valve (22), and the sixth control valve (14) is a normally closed valve. A branch is provided between the fourth control valve (12) and the second pressure source (2) to connect the control end of the sixth control valve (14).

5. The double-ended emergency shutoff system according to claim 4, characterized in that: The first control valve (11) and the second control valve (21) are connected via a mounting and dismounting interface (35).

6. The double-ended emergency shutoff system according to claim 5, characterized in that: A branch circuit provided between the second emergency stop switch (20) and the second control valve (21) is connected to the control end of the fourth control valve (12) via a first interface (31).

7. The double-ended emergency shutoff system according to claim 5, characterized in that: A second interface (32) is provided between the sixth control valve (14) and the control end of the third control valve (22).

8. The double-ended emergency shutoff system according to claim 5, characterized in that: A third interface (33) is provided between the inlet end of the fourth control valve (12) and the second pressure source (2).

9. The double-ended emergency shutoff system according to any one of claims 1 to 8, characterized in that: The first control valve (11) and the second control valve (21) are connected to the first storage tank (51) and the second storage tank (52) respectively.

10. The double-ended emergency shutoff system according to any one of claims 1 to 8, characterized in that: The second pressure source (2) is connected to the first pressure source (1) via a fourth interface (34).

11. The double-ended emergency shutoff system according to claim 10, characterized in that: A second air supply valve (42) is connected in series between the second pressure source (2) and the fourth interface (34), and a first air supply valve (41) is connected in series between the first pressure source (1) and the fourth interface (34).

12. The double-ended emergency shutoff system according to any one of claims 1 to 8, characterized in that: A plurality of the first emergency stop switches (10) are arranged in series.

13. The double-ended emergency shutoff system according to any one of claims 1 to 8, characterized in that: A plurality of the second emergency stop switches (20) are arranged in series.

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