Emergency stop device for batch loading controller

Abstract

The utility model discloses a batch loading controller emergency stop device which comprises a first relay, an emergency stop button, a liquid phase stop valve, a DCS control system and a second relay, a normally-closed contact on the emergency stop button is connected in a relay coil loop in series, when the emergency stop button is pressed down, the relay is powered off, a solenoid valve of the liquid phase stop valve is powered off, and the liquid phase stop valve is powered off. Even if the batch loading controller crashes and cannot receive an instruction of stopping loading by an emergency stop reset program, the liquid phase cut-off valve can be closed, and then loading is stopped. Besides, by utilizing the characteristic that a communication signal is interrupted when the batch loading controller breaks down and crashes, the main power supply of the batch loading controller is interlocked and cut off by monitoring a communication fault signal on the DCS, so that the loading can be automatically stopped, and the risk of overloading and overflowing caused by the fact that no one finds the fault of the batch loading controller is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to batch loading automatic control technical field, especially relate to a batch loading controller emergency stop device. BACKGROUND

[0002] In the chemical industry, the loading operation of liquid materials is an important link between production and sales. With the continuous expansion of the chemical industry and the increasing degree of automation of production, the safety and efficiency of the loading operation have become key factors. Taking the loading of ethylene oxide as an example, it has dangerous characteristics such as flammability, explosiveness, and toxicity, and has extremely strict requirements for the accuracy and safety of control during the loading process. Once the material overflows, it will cause serious safety accidents such as fire, explosion, and environmental pollution, posing a great threat to personnel safety, enterprise property, and the surrounding environment.

[0003] The current mainstream batch loading control system uses PLC (Programmable Logic Controller) or single-chip microcomputer to write control programs into the controller, and cooperates with field instruments such as pressure transmitters, mass flow meters, liquid phase shut-off valves, gas phase shut-off valves, regulating valves, and electrostatic grounding clamps to realize automatic control of loading. Once an emergency occurs and the loading needs to be terminated, the loading program needs to be reset by pressing the field emergency stop button to stop the loading. Since the batch loading control system is integrated and installed in the device pry block by the manufacturer, it cannot provide a constant temperature and humidity, dust-free, water-free, and oil-free environment for the batch loading controller, so the batch loading controller frequently fails. UTILITY MODEL CONTENT

[0004] The utility model aims at least to solve one of the technical problems existing in the prior art, and provides a batch loading controller emergency stop device. By connecting the normally closed contact of the emergency stop button in the relay coil loop, when the emergency stop button is pressed, the relay loses power, and the electromagnetic valve of the liquid phase shut-off valve loses power. Even if the batch loading controller crashes and cannot receive the stop loading instruction of the emergency stop reset program, it can also achieve the closing of the liquid phase shut-off valve and further stop the loading. In addition, by using the feature that the communication signal will be interrupted when the batch loading controller fails, the total power supply of the batch loading controller is interlocked and cut off on the DCS by monitoring the communication fault signal, which can automatically stop the loading and avoid the risk of overloading and overflow due to no one discovering the batch loading controller failure. Since the structure of the present application is simple, it is the first time to integrate the power interlocking function of the third-party controller in the DCS, and it does not depend on the firmware upgrade of the batch loading controller, providing a low-cost solution for old system modification, and is suitable for comprehensive promotion and use.

[0005] The utility model still provides the batch loading controller emergency stop device with above -mentioned one batch loading controller emergency stop device includes: relay one, emergency stop button, liquid phase cut -out valve, DCS control system, relay two, liquid phase cut -out valve includes solenoid valve, the coil loop of relay one is connected with the normally closed contact of emergency stop button, the normally open contact of relay one is connected with batch loading controller through emergency stop control signal, another group normally open contact of relay one links with the power supply loop of solenoid valve, batch loading controller adopts MODBUS protocol and establishes communication with DCS control system through RS485 serial ports, the coil of DCS control system and relay two are connected, relay two is connected with power supply two, power supply two is connected with batch loading controller, DCS control system and relay two are connected with power supply one.

[0006] According to the batch loading controller emergency stop device, the power supply one is 24V DC power supply, the power supply two is 220V AC power supply, and the 220V AC power supply is widely applied in home and industrial environments and is easy to access.

[0007] Compared with the prior art, the batch loading controller emergency stop device can realize the closing of the liquid phase cut-out valve and the stopping of loading by connecting the normally closed contact of the emergency stop button in the relay coil loop, losing power of the relay when pressing the emergency stop button, and losing power of the solenoid valve of the liquid phase cut-out valve. In addition, by utilizing the feature that the communication signal will be interrupted when the batch loading controller fails to operate, the total power supply of the batch loading controller can be cut off by monitoring the communication fault signal on the DCS, so as to realize automatic stopping of loading and avoid the risk of overloading and overflow due to no one finding the batch loading controller failure. Since the structure of the application is simple, the power interlocking function of the third-party controller is integrated in the DCS for the first time, and the application does not depend on the firmware upgrade of the batch loading controller, which provides a low-cost solution for old system modification and is suitable for comprehensive promotion and use. BRIEF DESCRIPTION OF DRAWINGS

[0008] The utility model is further illustrated below in connection with the drawings and examples;

[0009] Figure 1 It is the overall structural drawing of batch loading controller emergency stop device of the utility model.

[0010] Legend:

[0011] 1, relay one; 2, emergency stop button; 3, batch loading controller; 4, solenoid valve; 5, liquid phase cut-out valve; 6, DCS control system; 7, relay two; 8, power supply one; 9, power supply two. DETAILED DESCRIPTION

[0012] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0013] Reference Figure 1 This utility model provides an emergency stop device for a batch loading controller, comprising: a relay 1, an emergency stop button 2, a liquid phase shut-off valve 5, a DCS control system 6, and a relay 7. The liquid phase shut-off valve 5 includes a solenoid valve 4. The coil circuit of relay 1 is connected to the normally closed contact of the emergency stop button 2. The normally open contact of relay 1 is connected to the batch loading controller 3 via an emergency stop control signal. Another set of normally open contacts of relay 1 is connected to the power supply circuit of the solenoid valve 4. The batch loading controller 3 establishes communication with the DCS control system 6 via an RS485 serial port using the MODBUS protocol. The DCS control system 6 is connected to the coil of relay 7. Relay 7 is connected to a power supply 9, which is connected to the batch loading controller 3. The DCS control system 6 and relay 7 are connected to a power supply 8, which is a 24V DC power supply, and power supply 9 is a 220V AC power supply.

[0014] Specifically, a relay-1 is used to connect the normally closed contact of the emergency stop button 2 to the coil circuit of relay-1, controlling the energization and de-energization of the relay-1 coil. One set of normally open contacts of relay-1 is connected to the emergency stop control signal, which is transmitted to the batch loading controller 3. Another set of normally open contacts is connected in series in the power supply circuit of the solenoid valve 4 of the liquid phase shut-off valve 5. When the operator presses the emergency stop button 2, relay-1 is de-energized, the first set of normally open contact signals disconnects to reset the loading procedure, and the second set of normally open contact signals disconnects to de-energize the solenoid valve 4 of the liquid phase shut-off valve 5, thus achieving a dual rapid manual stop. During loading, the DCS control system 6 is a distributed control system. In the DCS control system 6 of the main unit, a fault signal for communication between the batch loading controller 3 and the DCS control system 6 is introduced. The DCS control system 6 performs interlocking logic to cut off the main power supply of the batch loading controller 3. The DCS control system 6 reads the heartbeat signal of the batch loading controller 3 every 500ms. If no signal is received for 6 consecutive times (3 seconds), the power interlocking cutoff command is triggered, and a pop-up window reminds the operator. After the power is lost, the field valve will close automatically under the action of the spring force in the cylinder, thereby realizing automatic emergency stop of loading.

[0015] Working principle: Firstly, a set of normally closed contacts on the emergency stop button 2 is connected in series with the coil of relay 1 (terminals 13 / 14). Relay 1 is powered by the power module inside the batch loading controller 3. One set of normally open contacts (terminals 5 / 9) of selector relay 1 is connected to the emergency stop signal channel of the batch loading controller 3, used by the batch loading controller 3 to determine whether the loading procedure should be executed. The other set of normally open contacts (terminals 8 / 12) of selector relay 1 is connected in series in the power supply circuit of the solenoid valve 4 of the liquid phase shut-off valve 5. Under normal circumstances, relay 1 is energized, and the normally open contacts 5 / 9 and 8 / 9... Both contacts 1 and 2 are in the closed state. When emergency stop button 2 is pressed, the normally closed contact of emergency stop button 2 opens, the coil of relay 1 is de-energized, and both sets of normally open contacts open. The disconnect signal of terminal 5 / 9 goes to the batch loading controller 3 to reset the loading program. The disconnect signal of terminal 8 / 12 causes the solenoid valve 4 of liquid phase shut-off valve 5 to be de-energized. After the solenoid valve 4 is de-energized, the compressed air in the cylinder of the valve actuator is discharged, and the valve will close automatically under the action of the spring force in the cylinder, thereby stopping the loading. This avoids the problem that the batch loading controller 3 cannot receive the emergency stop command to stop the loading program when it malfunctions and crashes.

[0016] Secondly, the DCS control system 6 in the control room communicates with the batch loading controller 3 via RS485 serial port using the MODBUS protocol. The DCS reads the heartbeat signal of the batch loading controller 3 every 500ms. If no signal is received for 6 consecutive times (3 seconds), a passive dry contact disconnect signal is output, which de-energizes the coil of relay 2 7, thereby opening the normally open contact (terminal 5 / 9) of relay 2 7. Finally, the 220V AC main power supply of the batch loading controller 3 is de-energized. Furthermore, the solenoid valve 4 of the liquid phase shut-off valve 5 will also lose power, the compressed air in the cylinder of the valve actuator will be discharged, and the valve will close automatically under the action of the spring force in the cylinder, thereby stopping the loading.

[0017] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A batch loading controller emergency stop device, characterized in that, include: Relay 1 (1), emergency stop button (2), liquid phase shut-off valve (5), DCS control system (6), relay 2 (7), the liquid phase shut-off valve (5) includes a solenoid valve (4), the coil circuit of relay 1 (1) is connected to the normally closed contact of the emergency stop button (2), the normally open contact of relay 1 (1) is connected to the batch loading controller (3) through the emergency stop control signal, and another set of normally open contacts of relay 1 (1) is connected to the power supply circuit of the solenoid valve (4); The batch loading controller (3) uses the MODBUS protocol to establish communication with the DCS control system (6) through the RS485 serial port. The DCS control system (6) is connected to the coil of the second relay (7). The second relay (7) is connected to the second power supply (9). The second power supply (9) is connected to the batch loading controller (3). The DCS control system (6) and the second relay (7) are connected to the first power supply (8).

2. The batch loading controller emergency stop device according to claim 1, characterized in that, The first power supply (8) is a 24V DC power supply, and the second power supply (9) is a 220VAC power supply.

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