An emergency cut-off interlocking device and control method for a dangerous goods liquid tank truck

Abstract

The application relates to an emergency cut-off interlocking device and control method for a dangerous liquid tank truck, wherein the device comprises a crane pipe, a sensor, a gas-phase connecting pipe, a liquid-phase connecting pipe, an emergency cut-off valve, a cylinder, an electromagnetic valve, a pressure switch, a hand brake and a main controller; the sensor is arranged at the end of the crane pipe and the loading and unloading port of the vehicle tank body, the sensor is electrically connected with the main controller; the emergency cut-off valve and a loading and unloading pump are arranged on the liquid-phase connecting pipe, the cylinder is arranged on the emergency cut-off valve, the loading and unloading pump is connected with the power supply through a loading and unloading pump switch; the electromagnetic valve is arranged on the air inlet pipeline of the cylinder, the electromagnetic valve is electrically connected with the pressure switch, the pressure switch is connected with the hand brake, and the pressure switch and the electromagnetic valve are electrically connected with the main controller. The technical scheme adopts the mode that the sensor is installed at the end of the crane pipe and can be normally loaded and unloaded only after being closely combined, when human operation failure or interface combination is out of position, the sensor has no detection signal transmission, the emergency cut-off valve is closed, and the loading and unloading safety of the truck is ensured.

Description

Technical Field

[0001] This invention belongs to the field of chemical transportation safety technology, specifically relating to an emergency shut-off interlock device and control method for dangerous liquid tank trucks. Background Technology

[0002] The loading sites for hazardous chemical vehicles must be equipped with seven interlocks (human static electricity detection, grounding, oil spill detection, loading arm return, key interlock, gas phase detection, and combustible gas detection). From this perspective, the current loading process for hazardous chemicals should be relatively safe.

[0003] During the actual loading and unloading process, the driver drives the vehicle to the designated loading location, engages the handbrake, and parks it according to the prescribed requirements. The operator connects the gas and liquid connecting pipes of the universal loading arm to the tank inlet of the vehicle, then opens the manual ball valve and starts the compressor to carry out the loading operation.

[0004] However, in actual operation, operator errors such as improper connection or driver errors during loading and unloading can lead to vehicle movement, which may cause accidents such as leakage or breakage of the loading arm. In severe cases, this can lead to leakage and explosion accidents, resulting in property damage and personal injury. Summary of the Invention

[0005] The purpose of this invention is to provide an emergency shut-off interlock device and control method for dangerous liquid tank trucks, in order to solve the problem that in actual loading and unloading processes, accidents such as leakage or breakage of the loading arm may occur due to reasons such as improper connection by operators or operational errors by drivers during loading and unloading, which may lead to vehicle movement.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] An emergency shut-off interlock device for a hazardous liquid tanker truck includes an loading arm, a sensor, a gas connection pipe, a liquid connection pipe, an emergency shut-off valve, a cylinder, a solenoid valve, a pressure switch, a handbrake, and a main controller.

[0008] The sensor is installed at the end of the loading arm and at the loading / unloading port of the vehicle tank to sense whether the connection between the loading arm and the loading / unloading port of the vehicle tank meets the requirements. The sensor is electrically connected to the main controller.

[0009] One end of the gas connection pipe and one end of the liquid connection pipe are both connected to the loading arm, the other end of the gas connection pipe is connected to the upper part of the storage tank, and the other end of the liquid connection pipe is connected to the lower part of the storage tank.

[0010] An emergency shut-off valve and a loading / unloading pump are installed on the liquid connection pipe. The cylinder is installed on the emergency shut-off valve and serves as the power source for closing or opening the emergency shut-off valve. The loading / unloading pump is connected to the power supply through a loading / unloading pump switch.

[0011] The solenoid valve is installed on the air intake pipe of the cylinder. The solenoid valve is electrically connected to the pressure switch. The pressure switch is connected to the handbrake. Both the pressure switch and the solenoid valve are electrically connected to the main controller.

[0012] Furthermore, a T-tube is used to connect the storage tank to the liquid connection pipe, and an emergency shut-off valve is installed on the T-tube.

[0013] Furthermore, the emergency shut-off valve is either open or closed when the cylinder is under normal pressure.

[0014] Furthermore, it also includes a manual remote control switch and a wireless remote control switch, both of which are electrically connected to the main controller.

[0015] Furthermore, the loading / unloading pump switch is connected to the main controller via electrical signals.

[0016] A control method for emergency shut-off of a dangerous goods liquid tanker truck, utilizing any of the above-mentioned dangerous goods liquid tanker truck emergency shut-off interlocking devices, includes a control method for starting loading and unloading cargo and a control method for the loading and unloading process.

[0017] The control method for initiating loading and unloading of goods includes the following steps:

[0018] S11. Park the vehicle at the loading and unloading location and connect the loading arm to the loading and unloading port of the vehicle's tank.

[0019] S12. The main controller determines whether it has received a sensor signal. If it has received a sensor signal, it proceeds to step S14. If it has not received a sensor signal, it proceeds to step S13.

[0020] Step S13: The cylinder on the emergency shut-off valve does not move, the solenoid valve does not move, the emergency shut-off valve is in the open or closed state, and the loading and unloading pump switch does not respond.

[0021] S14. If the main controller receives a sensor signal, the main controller determines whether the pressure switch is closed. If the pressure switch is closed, the main controller sends a control signal to the loading and unloading pump switch, and the loading and unloading pump switch responds to the control, starting the loading and unloading pump to load and unload goods. If the pressure switch is not closed, the main controller does not send a control signal to the loading and unloading pump switch, and the loading and unloading pump switch does not respond.

[0022] Control methods during loading and unloading of goods include the following steps:

[0023] The main controller detects whether it continuously receives sensor signals. If so, the main controller does not send control signals. Otherwise, it determines whether the time during which no sensor signals are continuously received is greater than a set value. If it is less than the set value, the main controller only sends an alarm signal. If it is greater than or equal to the set value, the main controller sends a control signal to the solenoid valve. The solenoid valve actuates, controls the cylinder to actuate, closes the emergency shut-off valve, and controls the leakage of gas and liquid.

[0024] Furthermore, control commands are sent to the main controller via manual remote control switch and wireless remote control switch, and the controller controls the opening and closing of the emergency shut-off valve through solenoid valve and cylinder.

[0025] The beneficial effects of this invention are:

[0026] This technical solution employs an electrical induction control method. Sensors are installed at the loading and unloading interfaces to ensure a tight connection before normal material loading and unloading. In the event of human error or improper interface connection, the sensors at the loading and unloading ports will fail to detect a signal, keeping the emergency shut-off valve closed and ensuring loading and unloading safety. Alternatively, a wireless remote control can be used to send commands to the main controller, causing the cylinder mounted on the emergency shut-off valve at the bottom of the tank to actuate and close the emergency shut-off valve, controlling the leakage of gas and liquid. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the control principle of the present invention. Detailed Implementation

[0028] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, and should not be construed as limiting the technical solution of the present invention.

[0029] like Figure 1 As shown, this application provides an emergency shut-off interlock device for a dangerous liquid tanker truck, which is installed between the storage tank and the vehicle tank body to ensure the safety of loading and unloading dangerous goods or other liquid or gaseous items.

[0030] In the technical solution of this application, the storage tank involved is an existing storage tank. There are no specific requirements for the shape of the storage tank, etc., and this application is not an improvement on the storage tank. As for the contents of the storage tank, it can be any liquid or gaseous article that should or can be stored in the storage tank. In this embodiment, the chemical hazardous materials stored in the storage tank are used as an example for explanation, because chemical hazardous materials have at least the characteristics of being flammable, explosive, toxic, and harmful.

[0031] This device includes an loading arm. In this application, the structure of the loading arm has not been improved; it remains the existing or conventional loading arm structure. Currently, loading arms are usually made of flexible hoses, which facilitates connection to the loading and unloading ports of vehicle tanks. Of course, there are also loading arms made of rigid materials. For example, loading arms at oil loading and unloading stations usually use rigid pipes. The loading arm is usually connected to a gas pipe to balance the air pressure inside the vehicle tank. For this purpose, the rear end of the loading arm (the end furthest from the loading and unloading port of the vehicle tank) has two pipelines: a gas phase pipeline and a liquid phase pipeline. The gas phase pipeline is connected to the gas connection pipe, and the liquid phase pipeline is connected to the liquid connection pipe.

[0032] The sensor is installed at the end of the loading arm and the loading / unloading port of the vehicle tank. The sensor in this application can be a position sensor or a pressure sensor, as long as it can detect whether the connection between the loading arm and the loading / unloading port of the vehicle tank meets the requirements. The sensor is electrically connected to the main controller and transmits the detected real-time signal to the main controller.

[0033] In the technical solution of this application, a loading and unloading platform is provided between the storage tank and the loading and unloading point for vehicle parking. A loading and unloading pump (compressor pump, compressor, etc.) is provided on the loading and unloading platform, and the loading and unloading pump switch is also provided on the loading and unloading platform. The loading and unloading pump is connected to the power supply through the loading and unloading pump switch, and the loading and unloading pump switch is connected to the main controller electrical signal. The outlet of the loading and unloading pump is connected to the liquid phase pipeline of the loading arm, and the inlet of the loading and unloading pump is connected to one end of the liquid connection pipe. The liquid connection pipe is connected to one outlet of the T-tube, and the other two ports of the T-tube are connected to the lower part of the storage tank. An emergency shut-off valve is provided on the T-tube. In other embodiments of this application, the T-tube may not be provided.

[0034] The emergency shut-off valve of this application uses a cylinder as the power source for opening or closing. The cylinder is mounted on the emergency shut-off valve, and its air intake pipe is connected to an air source. A solenoid valve is installed on the air intake pipe to control the opening and closing of the air intake pipe. In the technical solution of this application, the emergency shut-off valve can be closed or opened by either connecting or disconnecting the air source. Conversely, this can be designed as needed and does not affect the implementation of this technical solution. The only difference is that the emergency shut-off valve is closed when the cylinder is connected to the air source, or open when the cylinder is disconnected from the air source (i.e., at normal pressure). Alternatively, the emergency shut-off valve is closed when the cylinder is disconnected from the air source, or open when the cylinder is connected to the air source (i.e., at normal pressure). In other embodiments of this application, the operating relationship between the cylinder and the emergency shut-off valve can be adjusted as needed.

[0035] A pressure switch is installed at the air supply point of the vehicle's handbrake. The pressure switch closes only when the driver pulls down the handbrake, causing the solenoid valve to either close or open, thus cutting off or connecting the air supply to the cylinder. In this application, both the pressure switch and the solenoid valve are electrically connected to the main controller.

[0036] In this application, a manual remote control switch and a wireless remote control switch are also provided. Both the manual remote control switch and the wireless remote control switch are electrically connected to the main controller and are used to send control commands to the main controller.

[0037] This application also provides a control method for emergency shut-off of a dangerous goods liquid tanker truck, utilizing the emergency shut-off interlock device for dangerous goods liquid tanker trucks described above, including a control method for starting loading and unloading and a control method during the loading and unloading process, for controlling whether loading and unloading of goods takes place and how to control dangerous situations during the loading and unloading process.

[0038] The control method for initiating loading and unloading of goods includes the following steps:

[0039] S11. Park the vehicle at the loading and unloading location and connect the loading arm to the loading and unloading port of the vehicle's tank.

[0040] S12. The main controller determines whether it has received a sensor signal. If a sensor signal is received, it means that the connection between the loading arm and the loading / unloading port of the vehicle tank is in place and meets the requirements, and the loading and unloading of goods can be carried out. Then proceed to step S14. If no sensor signal is received, it means that the connection between the loading arm and the loading / unloading port of the vehicle tank is not in place and does not meet the conditions for loading and unloading goods. Then proceed to step S13.

[0041] Step S13: The cylinder on the emergency shut-off valve does not operate (here, "not operating" means that the emergency shut-off valve remains in its original state. Normally, when there is no loading or unloading of goods, the emergency shut-off valve is in the open state. Whether to load or unload goods is controlled by the loading and unloading pump to avoid the emergency shut-off valve needing to operate frequently when loading and unloading goods continuously, which would affect its service life and accuracy). The solenoid valve does not operate (the main controller does not send a working command, and the solenoid valve remains in its current state). The emergency shut-off valve is in the open state (of course, it can also be set to be in the closed state). The loading and unloading pump switch does not respond. Here, the main controller does not send a loading or unloading command to the loading and unloading pump. At this time, when the loading and unloading pump switch button is pressed manually, the loading and unloading pump switch is not turned on, and the loading and unloading pump remains in the stopped state.

[0042] S14. If the main controller receives a sensor signal, it determines whether the pressure switch is closed. If the pressure switch is closed, the main controller sends a control signal to the loading and unloading pump switch, which controls the loading and unloading pump to start. Alternatively, if the start button of the loading and unloading pump switch needs to be pressed manually, the loading and unloading pump switch will respond (this response includes the automatic control part of the main controller, or whether the loading and unloading pump can be turned on by manually pressing the loading and unloading pump switch). The loading and unloading pump will start to load and unload goods. If the pressure switch is not closed, the main controller will not send a control signal, the cylinder on the emergency shut-off valve will not operate, the solenoid valve will not operate, the emergency shut-off valve will be in the closed state, the loading and unloading pump switch will not respond, and the loading and unloading of goods cannot be carried out.

[0043] Control methods during loading and unloading of goods include the following steps:

[0044] This part of the control refers to the control during the normal cargo loading and unloading process.

[0045] The main controller checks whether it continuously receives sensor signals. If so, the main controller does not send control signals. Otherwise, it checks whether the time during which no sensor signals are received is greater than a set value, such as 3 seconds, 5 seconds, or 10 seconds. If it is less than the set value, the main controller only sends an alarm signal to remind the operator that there is a temporary non-compliance between the loading arm and the vehicle tank loading / unloading port, which requires attention and inspection.

[0046] If the value is greater than or equal to the set value, it indicates that the connection between the loading arm and the loading / unloading port of the vehicle tank is not in accordance with regulations and is too long, which is dangerous. The main controller sends a control signal to the solenoid valve, the solenoid valve acts, the control cylinder acts, the emergency shut-off valve is closed, the gas and liquid overflow is controlled, and an alarm signal is sent to the local and remote systems at the same time.

[0047] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A control method for emergency shut-off of a hazardous liquid tanker truck, utilizing an emergency shut-off interlocking device for the hazardous liquid tanker truck, characterized in that, This includes control methods for initiating loading and unloading of goods, as well as control methods during the loading and unloading process; The control method for initiating loading and unloading of goods includes the following steps: S11. Park the vehicle at the loading and unloading location and connect the loading arm to the loading and unloading port of the vehicle's tank. S12. The main controller determines whether it has received a sensor signal. If a sensor signal is received, it indicates that the connection between the loading arm and the loading / unloading port of the vehicle tank is in place and meets the conditions for loading and unloading goods. Then proceed to step S14. If no sensor signal is received, it indicates that the connection between the loading arm and the loading / unloading port of the vehicle tank is not in place and does not meet the conditions for loading and unloading goods. Then proceed to step S13. Step S13: The cylinder on the emergency shut-off valve does not move, the solenoid valve does not move, the emergency shut-off valve is in the closed state, and the loading / unloading pump switch does not respond. S14. If the main controller receives a sensor signal, the main controller determines whether the pressure switch is closed. If the pressure switch is closed, when the main controller sends a control signal to the loading and unloading pump switch, the loading and unloading pump switch responds to the control and starts loading and unloading the goods. If the pressure switch is not closed, the main controller does not send a control signal to the loading and unloading pump switch, and the loading and unloading pump switch does not respond. Control methods during loading and unloading of goods include the following steps: The main controller detects whether it continuously receives sensor signals. If so, the main controller does not send control signals. Otherwise, it determines whether the time during which no sensor signals are continuously received is greater than a set value. If it is less than the set value, the main controller only sends an alarm signal. If it is greater than or equal to the set value, the main controller sends a control signal to the solenoid valve. The solenoid valve actuates, controls the cylinder to actuate, closes the emergency shut-off valve, and controls the leakage of gas and liquid. Control commands are sent to the main controller via manual remote control switch and wireless remote control switch. The main controller controls the opening and closing of the emergency shut-off valve through solenoid valve and cylinder. The emergency shut-off interlock device for dangerous liquid tank trucks includes loading arms, sensors, gas connection pipes, liquid connection pipes, emergency shut-off valves, cylinders, solenoid valves, pressure switches, hand brakes, and main controllers. The sensor is installed at the end of the loading arm and at the loading / unloading port of the vehicle tank to sense whether the connection between the loading arm and the loading / unloading port of the vehicle tank meets the requirements. The sensor is electrically connected to the main controller. One end of the gas connection pipe and one end of the liquid connection pipe are both connected to the loading arm, the other end of the gas connection pipe is connected to the upper part of the storage tank, and the other end of the liquid connection pipe is connected to the lower part of the storage tank. An emergency shut-off valve and a loading / unloading pump are installed on the liquid connection pipe. The cylinder is installed on the emergency shut-off valve and serves as the power source for closing or opening the emergency shut-off valve. The loading / unloading pump is connected to the power supply through a loading / unloading pump switch. The solenoid valve is installed on the intake pipe of the cylinder. The solenoid valve is electrically connected to the pressure switch. The pressure switch is connected to the handbrake. Both the pressure switch and the solenoid valve are electrically connected to the main controller.

2. The control method for emergency shut-off of dangerous liquid tank trucks according to claim 1, characterized in that, A T-tube is used to connect the storage tank to the liquid connection pipe, and an emergency shut-off valve is installed on the T-tube.

3. The control method for emergency shut-off of dangerous liquid tank trucks according to claim 1, characterized in that, When the cylinder is under normal pressure, the emergency shut-off valve is in the closed state.

4. The control method for emergency shut-off of dangerous liquid tank trucks according to claim 1, characterized in that, It also includes a manual remote control switch and a wireless remote control switch, both of which are electrically connected to the main controller.

5. The control method for emergency shut-off of dangerous liquid tank trucks according to claim 1, characterized in that, The loading / unloading pump switch is connected to the main controller via electrical signal.

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