A protection method for abnormal power-off of a switch type electric door

Abstract

The application provides a protection method for abnormal power-off of a switch type electric door, applied to the field of automatic control technology, and comprises the following steps: a distributed controller performs logical judgment on each control signal output by a current electric control unit through a built-in logic chip and a flip-flop; if at least one control signal in multiple control signals of a load electric door device controlled by the electric control unit is in an interrupt state, the distributed controller issues a power-off instruction signal to the control unit; after receiving the power-off instruction signal, the KA1 main contact of a built-in DC relay of the control unit disconnects the N phase and the A phase of a power supply, the KM1 main contact of an AC contactor and the KM2 auxiliary contact of the AC contactor mechanically connected with the KM1 main contact of the AC contactor are disconnected, and the control unit cuts off the power supply for the electric control unit; and the application effectively avoids the hidden danger of a major and malignant accident caused by misoperation of the electric door in the production process of a petrochemical boiler.

Description

Technical Field

[0001] This application relates to the field of automation control technology, and more specifically, to a protection method for abnormal power failure of a switch-type electric door. Background Technology

[0002] Large petrochemical boilers typically have electrically operated main steam outlet valves, main feedwater valves, and turbine inlet valves. When the electric control unit of the petrochemical boiler is operating normally, these valves are in the fully open position. However, if the main control circuit board of the electric control unit malfunctions or the control signal cable short-circuits, the electric control unit may malfunction and close the valves, cutting off steam or feedwater. This can lead to major accidents such as production shutdowns and huge economic losses. Summary of the Invention

[0003] In view of this, this application provides a protection method for abnormal power failure of a switch-type electric door. It designs a distributed controller and a control unit with a branch circuit in the electric control unit. The distributed controller accurately obtains the control signal of abnormal short circuit and issues a power failure control command, so that the electric control unit remains in place, avoiding the electric door failure during the petrochemical boiler production process and effectively avoiding huge economic losses.

[0004] In a first aspect, embodiments of this application provide a protection method for abnormal power failure of a switch-type electric door. The method is applied to a protection device for abnormal power failure of a switch-type electric door. The device includes: a distributed controller, an electric control unit, and a control unit. The control unit consists of a DC relay and an AC contactor. The distributed controller is connected to the control terminal of the DC relay. One end of the KA1 main contact of the DC relay is connected to the N-phase and A-phase of the power supply. The other end of the KA1 main contact of the DC relay is connected to the neutral wire of the AC contactor. One end of the KM1 main contact of the AC contactor is connected to the power supply. One end of the KM1 main contact of the AC contactor is connected to one end of the KM2 auxiliary contact of the AC contactor. The other end of the KM2 auxiliary contact of the AC contactor is connected to the electric control unit. The electric control unit is connected to the load electric door device through a switching unit.

[0005] When the electric control unit enters the working state, according to a preset time interval, the distributed controller performs logical judgment on each control signal output by the electric control unit at the current time.

[0006] If at least one of the multiple control signals of the load electric door device controlled by the electric control unit is in an interrupted state, the distributed controller sends a power-off command signal to the control unit.

[0007] After receiving the power-off command signal, the main contact KA1 of the DC relay built into the control unit disconnects the N-phase and A-phase of the power supply. After disconnecting the main contact KA1, the main contact KM1 of the AC contactor and the auxiliary contact KM2 of the AC contactor, which is mechanically connected to the main contact KM1 of the AC contactor, are disconnected, so that the control unit cuts off the power supply to the electric control unit.

[0008] In conjunction with the first aspect, this application provides a first possible implementation of the first aspect, wherein, before the distributed controller performs logical judgment on each control signal output by the current electric control unit through the built-in logic chip and triggers, it further includes:

[0009] In response to a user operation command, the electric control unit outputs a high-level signal for a preset duration to the distributed controller, and the distributed controller and the electric control unit are interlocked and connected under the action of the high-level signal.

[0010] The distributed controller acquires multiple control signals output by the electric control unit at any given moment in real time. These multiple control signals are used to characterize the status signals indicating whether the feedback load electric door device is operating normally.

[0011] In conjunction with the first possible implementation of the first aspect, this application provides a second possible implementation of the first aspect, wherein when the electric control unit enters the working state, according to a preset time interval, the distributed controller performs logical judgments on each control signal currently output by the electric control unit through a built-in logic chip and triggers, including:

[0012] When the electric control unit enters the working state, it inputs a control signal with a preset time interval to the distributed controller;

[0013] The distributed controller uses built-in logic chips and triggers to make logical judgments on the current operating status of all state signals in the feedback load electric gate device.

[0014] If all status signals are in the fully activated state, the distributed controller outputs a high-level signal to the electric control unit, and the electric control unit is in the activated state.

[0015] In conjunction with the first or second possible implementation of the first aspect, this application provides a third possible implementation of the first aspect, wherein the method further includes:

[0016] If all or some of the status signals are turned off momentarily, the distributed controller outputs a low-level signal to the electric control unit, and the electric control unit is in an interrupted state.

[0017] In conjunction with the first or second possible implementation of the first aspect, this application provides a fourth possible implementation of the first aspect, wherein if at least one of the multiple control signals of the load electric door device controlled by the electric control unit is in an interrupted state, the distributed controller sends a power-off command signal to the control unit, including:

[0018] If all or part of the status signals in the control signals are turned off momentarily, then at least one control signal of the load electric door device controlled by the electric control unit is in an interrupted state.

[0019] The distributed controller determines whether the high-level signal received at the R terminal of the trigger is less than the high-level signal received at the S terminal. If it is less, the Q1 terminal of the trigger outputs a power-off command signal to the control unit.

[0020] In conjunction with the first or second possible implementation of the first aspect, this application provides a fifth possible implementation of the first aspect, wherein, after the control unit receives a power-off command signal, the KA1 main contact of the DC relay built into the control unit disconnects the N-phase and A-phase of the power supply. After the KA1 main contact is disconnected, the KM1 main contact of the AC contactor connected to the DC relay and the KM2 auxiliary contact of the control unit mechanically connected to the KM1 main contact are disconnected. The control unit cuts off the power supply to the electric control unit, so that the switching unit remains in its original position, including:

[0021] When the control unit receives a power-off command signal, the iron core of the DC relay disconnects the N-phase and A-phase of the power supply at one end of the KA1 main contact under the action of the spring;

[0022] After the KA1 main contact disconnects the power supply, the KM1 main contact of the AC contactor connected in series with the other end of the DC relay disconnects, and the KM2 auxiliary contact of the AC contactor mechanically connected to the KM1 main contact disconnects. The control unit cuts off the power supply to the electric control unit, so that the switching unit remains in its original position.

[0023] This application provides a protection method for abnormal power failure of a switch-type electric door. The method includes: when the electric control unit enters the working state, according to a preset time interval, the distributed controller performs logical judgment on each control signal output by the current electric control unit through the built-in logic chip and trigger; if at least one of the multiple control signals of the load electric door device controlled by the electric control unit is in an interrupted state, the distributed controller sends a power failure command signal to the control unit; after receiving the power failure command signal, the KA1 main contact of the DC relay built into the control unit disconnects the N phase and A phase of the power supply; after disconnecting the KA1 main contact, the KM1 main contact of the AC contactor and the KM2 auxiliary contact of the AC contactor mechanically connected to the KM1 main contact of the AC contactor are disconnected, so that the control unit cuts off the power supply to the electric control unit. Specifically, this solution designs a distributed controller to perform logical judgments on various control signals output by the electric control unit during the production process, accurately obtaining control signals for abnormal short circuits to prevent electric door malfunctions during petrochemical boiler production. A branch circuit control unit is also designed within the electric control unit. When the electric control unit malfunctions or the control signal experiences an abnormal short circuit, the N-phase and A-phase of the power supply are disconnected via the KA1 main contact of the DC relay in the control unit. After the KA1 main contact is disconnected, the KM1 main contact and KM2 auxiliary contact of the AC contactor connected in series at the other end of the DC relay disconnect the power supply, thus ensuring that the switch unit connected to the load electric door remains in its original position, preventing malfunctions of the electric door during petrochemical boiler production that could lead to major accidents.

[0024] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 The diagram illustrates the working principle of a protection method for abnormal power failure of a switch-type electric door provided in an embodiment of this application.

[0027] Figure 2 The diagram shows a schematic flow chart of a protection method for abnormal power failure of a switch-type electric door provided in an embodiment of this application.

[0028] Figure 3This illustration shows a schematic diagram of determining the state of the control signal in a protection method for abnormal power failure of a switch-type electric door provided in an embodiment of this application.

[0029] Figure 4 A schematic diagram of a protection device for abnormal power failure of a switch-type electric door provided in an embodiment of this application is shown. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] Considering that in the existing technology, abnormal malfunctions in the electric control unit of a petrochemical boiler or short circuits in the control signal cable can easily cause the electric control unit to malfunction, this application provides a protection method for abnormal power failure of a switch-type electric door, which is described below through embodiments.

[0032] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] Figure 1 This illustration shows a schematic diagram of the working principle of a protection method for abnormal power failure of a switch-type electric door provided in an embodiment of this application; Figure 2 This application provides a schematic flowchart of a protection method for abnormal power failure of a switch-type electric door according to an embodiment of the present application; as shown. Figure 1 , 2 As shown, the specific steps include:

[0034] Step S10: When the electric control unit enters the working state, the distributed controller performs logical judgment on each control signal output by the current electric control unit through the built-in logic chip and trigger according to the preset time interval.

[0035] In specific implementation, step S10 applies this method to a protection device for abnormal power failure of a switch-type electric door. This device includes a distributed controller, an electric control unit, and a control unit. The distributed controller is connected to both the electric control unit and the control unit, and the electric control unit is connected to the control unit. When the electric control unit is powered on, it continuously outputs a high-level signal at a preset time interval to the distributed controller. Under the influence of the high-level signal, the distributed controller acquires multiple control signals corresponding to the load electric door device controlled by the electric control unit for the preset time interval. Based on the storage principle of multiple built-in logic chips and the working principle of multiple flip-flops, it performs logical judgments on the acquired multiple control signals, such as... If the trigger outputs a high-level signal, the distributed controller determines that the control signal in the load electric gate device controlled by the electric control unit is in a fully open state, indicating that the electric control unit is in normal operation. If the trigger outputs a low-level signal, the distributed controller determines that all or part of the control signal in the load electric gate device controlled by the electric control unit is momentarily closed, indicating that the electric control unit is in an abnormal interruption state. In this embodiment, a 24VDC / 10A DC relay and a 220VAC / 10A AC contactor are selected; the electric control unit is powered by a 380V AC power supply; the first to fifth logic chips are AND gate chips and / or NOT gate chips.

[0036] Step S20: If any one or more control signals of the load electric door device controlled by the electric control unit are in an interrupted state, the distributed controller sends a power-off command signal to the control unit.

[0037] In specific implementation of step S20, if any state signal in the control signal controlled by the electric control unit is in the off state, the electric control unit outputs a low-level signal to the first logic chip. The first logic chip outputs a low-level signal to the second logic chip through the first and second flip-flops. The second logic chip changes the low-level signal to a high-level signal through NOT logic, and outputs the high-level signal to the third flip-flop through the third, fourth, and fifth logic chips. Based on the working principle of the flip-flops, it is determined whether the high-level signal received at the R terminal of the third flip-flop is less than the high-level signal received at the S terminal. If it is less, the Q3 output terminal of the third flip-flop outputs a low-level signal to the distributed controller, which means that at least one control signal of the load electric door device controlled by the electric control unit is in the interrupted state. At this time, the distributed controller sends a power-off command signal to the control unit.

[0038] In step S30, after receiving the power-off command signal, the main contact of the DC relay built into the control unit disconnects the N-phase and A-phase of the power supply. After the main contact of KA1 is disconnected, the main contact of the AC contactor KM1 and the auxiliary contact of the AC contactor KM2, which is mechanically connected to the main contact of the AC contactor KM1, are disconnected, so that the control unit cuts off the power supply to the electric control unit.

[0039] In specific implementation of step S30, the control unit includes a DC relay and an AC contactor. One end of the KA1 main contact of the DC relay is connected to the N-phase and A-phase of the power supply, and the other end of the KA1 main contact is connected to the neutral wire of the AC contactor. One end of the KM1 main contact of the AC contactor is connected to the A-phase, B-phase, and C-phase of the power supply, and the other end of the KM1 main contact is connected to one end of the KM2 auxiliary contact of the AC contactor. The other end of the KM2 auxiliary contact is connected to the electric control unit. The control unit receives... After the power-off command signal is received, the KA1 main contact of the DC relay disconnects the N-phase and A-phase of the power supply, that is, the KM1 main contact of the AC contactor subsequently disconnects the power supply. At this time, the KM2 auxiliary contact of the AC contactor, which is mechanically connected to the KM1 main contact of the AC contactor, disconnects in sequence. The control unit cuts off the A-phase, B-phase, and C-phase of the power supply to the electric control unit, so that the switch unit connected to one end of the electric control unit remains in its original position. In this embodiment, a 24VDC / 10A DC relay is selected, and a 220VAC / 10A AC contactor is selected.

[0040] In one feasible implementation, before performing step S10 above, the following is also included:

[0041] Step 01: In response to the user's operation command, the electric control unit outputs a high-level signal for a preset duration to the distributed controller, and the distributed controller and the electric control unit are interlocked and connected under the action of the high-level signal.

[0042] Step 02: The distributed controller acquires multiple control signals output by the electric control unit at each moment in real time. These multiple control signals are used to characterize the status signals of whether the feedback load electric door device is operating normally.

[0043] In specific implementation of steps 01 and 02, when the electric control unit receives a sudden change in the electrical signal output by the power supply, the electric control unit automatically opens the switching unit, so that the power supply automatically supplies power to the load electric door device connected to the switching unit. At this time, the electric control unit outputs a high-level signal for a preset duration to the distributed controller. Under the action of the high-level signal, the distributed controller obtains multiple control signals corresponding to the load electric door device controlled by the electric control unit at each moment. Here, the multiple control signals to be monitored include the first state signal, the second state signal, the third state signal, the fourth state signal, the fifth state signal, the sixth state signal, the seventh state signal, and the eighth state signal. Among them, the state signals carried in the multiple control signals represent the feedback signal of the main steam outlet electric door of the petrochemical boiler, the feedback signal of the main feedwater electric door, the feedback signal of the turbine inlet electric door, etc.

[0044] In a feasible implementation scheme Figure 3 This illustration shows a schematic diagram of determining the state of a control signal in a protection method for abnormal power failure of a switch-type electric door provided in an embodiment of this application; in step S10 above, when the electric control unit enters the working state, according to a preset time interval, the distributed controller performs logical judgment on each control signal output by the current electric control unit through the built-in logic chip and triggers, including:

[0045] Step 101: When the electric control unit enters the working state, it inputs a control signal with a preset time interval to the distributed controller.

[0046] Step 102: The distributed controller uses its built-in logic chip and triggers to make logical judgments on the current operating status of all state signals in the feedback load electric gate device.

[0047] Step 103: If all status signals are in the fully activated state, the distributed controller outputs a high-level signal to the electric control unit, and the electric control unit is in the activated state.

[0048] Step 104: If all or some of the status signals are turned off momentarily, the distributed controller outputs a low-level signal to the electric control unit, and the electric control unit is in an interrupted state.

[0049] In specific implementation, steps 101, 102, 103, and 104 involve the following steps: After the electric control unit enters the working state, it outputs a high-level signal for a preset duration to the distributed controller. Under the influence of the high-level signal, the electric control unit inputs a control signal with a preset time interval to the distributed controller. The distributed controller receives the high-level signal of the first state signal through the first input terminal of the first logic chip and the high-level signal of the second state signal through the second input terminal of the first logic chip. Under the influence of the high-level signal of the first logic chip, the distributed controller outputs a high-level signal to the R terminal of the first flip-flop through the output terminal of the first logic chip and receives the high-level signal of the third state signal through the S terminal of the first flip-flop. Then, it receives the high-level signal of the fourth state signal through the S terminal of the second flip-flop. It then outputs a high-level signal to the third input terminal of the second logic chip through the Q1 output terminal of the first flip-flop and to the fourth input terminal of the second logic chip through the Q2 output terminal of the second flip-flop. Under the influence of the high-level signals of the first and second flip-flops, the distributed controller outputs a high-level signal to the fifth input terminal of the third logic chip through the output terminal of the second logic chip. The high-level signal received by the third logic chip through the sixth input terminal of the fifth logic chip and the high-level signal output by the fifth state signal are used to output a high-level signal to the seventh input terminal of the fourth logic chip through the output terminal of the third logic chip. The high-level signal received by the fourth logic chip through the eighth input terminal of the fourth logic chip and the high-level signal output by the sixth state signal are used to output a high-level signal to the ninth input terminal of the fifth logic chip through the output terminal of the fourth logic chip. The high-level signal output by the seventh state signal through the tenth input terminal of the fifth logic chip and the high-level signal output by the fifth logic chip are used to output a high-level signal to the R terminal of the third flip-flop through the output terminal of the fifth logic chip. The high-level signal received by the third flip-flop through the S terminal of the third flip-flop and the high-level signal output by the eighth state signal are used to output a high-level signal to the distributed controller through the Q3 output terminal of the third flip-flop. Based on the high-level signal output by the third flip-flop, the distributed controller determines that the load electric door device controlled by the electric control unit is in the fully open state, so that the switching unit remains in the open circuit state and continues to supply power to the load electric door device.

[0050] When all or part of the control signals in the load electric door device controlled by the electric control unit are momentarily closed, the distributed controller receives a low-level signal of the first state signal through the first input terminal of the first logic chip, and a high-level signal of the second state signal output through the second input terminal of the first logic chip. Based on the storage principle of the first logic chip, i.e., logic 0 (low) or logic 1 (high), the first logic chip performs the basic logic of AND operation. The AND operation is 0 (low) if a and b are both 0, and 1 (high) if a and b are both 1. Therefore, the low-level signal is output to the R terminal of the first flip-flop and the R terminal of the second flip-flop through the output terminal of the first logic chip. At this time, the R terminal of the first flip-flop receives... A low-level signal is received at the S terminal of the first flip-flop, which receives a high-level signal output from the third state signal. Simultaneously, the R terminal of the second flip-flop receives a low-level signal, and the S terminal of the second flip-flop receives a high-level signal output from the fourth state signal. Based on the working principle of flip-flops, when either the first or second flip-flop is powered on, the S terminal of the first flip-flop is high, the R terminal is low, and the output of the first flip-flop is monostable and in a static state. Therefore, a low-level signal is output from the Q1 terminal of the first flip-flop to the fourth input terminal of the second logic chip, and a low-level signal is output from the Q2 terminal of the second flip-flop to the fourth input terminal of the second logic chip. Because the first flip-flop… Both the Q1 terminal of the first and second flip-flops output low-level signals. These low-level signals are then converted to high-level signals by the NOT logic of the second logic chip. Therefore, a high-level signal is output to the fifth input terminal of the third logic chip through the output terminal of the second logic chip, and a high-level signal is received from the fifth state signal output through the sixth input terminal of the third logic chip. Based on the storage principle of the logic chips, it can be deduced that the output terminal of the third logic chip outputs a high-level signal to the seventh input terminal of the fourth logic chip, and a high-level signal is received from the sixth state signal output through the eighth input terminal of the fourth logic chip. According to the storage principle of the logic chips, the output terminal of the fourth logic chip outputs a high-level signal to the fifth logic chip. The ninth input terminal of the chip outputs a high-level signal, and the tenth input terminal of the fifth logic chip receives a high-level signal output from the seventh state signal. Based on the AND operation, if a and b are both 0, it is 0 (low), and if a and b are both 1, it is 1 (high). The output terminal of the fifth logic chip outputs a high-level signal to the R terminal of the third flip-flop, and the S terminal of the third flip-flop receives a high-level signal output from the eighth state signal. It is determined whether the high-level signal received at the R terminal of the third flip-flop is less than the high-level signal received at the S terminal. If it is less, the Q3 output terminal of the third flip-flop outputs a low-level signal to the distributed controller, which means that at least one control signal of the load electric door device controlled by the electric control unit is in an interrupted state.

[0051] In a feasible implementation, in step S20 above, if at least one of the multiple control signals of the load electric door device controlled by the electric control unit is in an interrupted state, the distributed controller sends a power-off command signal to the control unit, including:

[0052] Step 201: If all or part of the status signals in the control signal are turned off momentarily, then at least one control signal of the load electric door device controlled by the electric control unit is in an interrupted state.

[0053] Step 202: The distributed controller determines whether the high-level signal received at the R terminal of the trigger is less than the high-level signal received at the S terminal. If it is less, the Q1 terminal of the trigger outputs a power-off command signal to the control unit.

[0054] In specific implementation of steps 201 and 202, if all or part of the status signals in the control signal are momentarily turned off, the electric control unit outputs a low-level signal to the first logic chip. The first logic chip outputs a low-level signal to the second logic chip through the first and second flip-flops. The second logic chip changes the low-level signal to a high-level signal through NOT logic, and then outputs the high-level signal to the third flip-flop through the third, fourth, and fifth logic chips. The distributed controller determines whether the high-level signal received at the R terminal of the third flip-flop is less than the high-level signal received at the S terminal. If it is less, the Q3 terminal of the third flip-flop outputs a power-off command signal to the control unit.

[0055] In a feasible implementation, in step S30 above, after the control unit receives the power-off command signal, the KA1 main contact of the DC relay built into the control unit disconnects the N-phase and A-phase of the power supply. After the KA1 main contact is disconnected, the KM1 main contact of the AC contactor and the KM2 auxiliary contact of the AC contactor mechanically connected to the KM1 main contact of the AC contactor are disconnected, so that the control unit cuts off the power supply to the electric control unit, including:

[0056] Step 301: When the control unit receives the power-off command signal, the iron core of the DC relay disconnects the N-phase and A-phase of the power supply at one end of the KA1 main contact under the action of the spring.

[0057] In step 302, after the KA1 main contact disconnects the power supply, the KM1 main contact of the AC contactor connected in series with the other end of the DC relay disconnects, and the KM2 auxiliary contact of the AC contactor mechanically connected to the KM1 main contact disconnects. The control unit cuts off the power supply to the electric control unit, so that the switching unit remains in its original position.

[0058] In specific implementation of steps 301 and 302, after the control unit receives the power-off command signal, the iron core of the DC relay disconnects the N-phase and A-phase of the power supply through its KA1 main contact under the action of the spring. Under the action of the KA1 main contact of the DC relay disconnecting, after the AC contactor connected to the other end of the KA1 main contact of the DC relay is powered down, the KM1 main contacts 1, 3, and 5 of the AC contactor automatically disconnect. At this time, the KM2 auxiliary contacts 2, 4, and 6 of the AC contactor, which are mechanically connected to the KM1 main contacts 1, 3, and 5 of the AC contactor, disconnect in sequence. That is, the A-phase, B-phase, and C-phase of the power supply to the control unit and the electric control unit are cut off, so that the switch unit connected to one end of the electric control unit remains in its original position.

[0059] Figure 4 This application provides a schematic diagram of a protection device for abnormal power failure of a switch-type electric door, as illustrated in an embodiment of this application. Figure 4 As shown, the above-mentioned device includes: a distributed controller 100, an electric control unit 200, a control unit 300, and a power supply 400. The control unit 300 consists of a DC relay and an AC contactor. The distributed controller 100 is connected to the control terminal of the DC relay. One end of the KA1 main contact of the DC relay is connected to the N-phase and A-phase of the power supply 400. The other end of the KA1 main contact of the DC relay is connected to the neutral wire of the AC contactor. One end of the KM1 main contact of the AC contactor is connected to the power supply 400. The other end of the KM1 main contact of the AC contactor is connected to one end of the KM2 auxiliary contact of the AC contactor. The other end of the KM2 auxiliary contact of the AC contactor is connected to the electric control unit 100. The electric control unit 100 is connected to the load electric door device through a switching unit.

[0060] In specific implementation, the above-mentioned device is used for the protection method against abnormal power failure of a switch-type electric door. The device includes: a distributed controller 100, an electric control unit 200, and a control unit 300. The distributed controller 100 is connected to both the electric control unit 200 and the control unit 300, and the electric control unit 200 is connected to the control unit 300. When the electric control unit 200 is powered on, it continuously outputs a high-level signal at a preset time interval to the distributed controller 100. Under the action of the high-level signal, the distributed controller 100 acquires various control parameters corresponding to the load electric door device controlled by the electric control unit 300 for the preset time interval. The distributed controller 100 uses the signal and the storage principle of multiple built-in logic chips and the working principle of multiple flip-flops to perform logical judgment on the acquired multiple control signals. If the flip-flop outputs a high-level signal, the distributed controller 100 determines that the control signal in the load electric door device controlled by the electric control unit 200 is in a fully open state, indicating that the electric control unit 200 is in a normal operating state. If the flip-flop outputs a low-level signal, the distributed controller 100 determines that all or part of the control signal in the load electric door device controlled by the electric control unit 200 is momentarily closed, indicating that the electric control unit 200 is in an abnormal interruption state.

[0061] If any state signal in the control signals controlled by the electric control unit 200 is in the off state, the electric control unit 200 outputs a low-level signal to the first logic chip. The first logic chip outputs a low-level signal to the second logic chip through the first and second flip-flops. The second logic chip changes the low-level signal to a high-level signal through NOT logic, and outputs the high-level signal to the third flip-flop through the third, fourth and fifth logic chips. Based on the working principle of the flip-flops, it is determined whether the high-level signal received at the R terminal of the third flip-flop is less than the high-level signal received at the S terminal. If it is less, the Q3 output terminal of the third flip-flop outputs a low-level signal to the distributed controller, which means that at least one control signal of the load electric door device controlled by the electric control unit 200 is in the interrupt state. At this time, the distributed controller 100 sends a power-off command signal to the control unit 300.

[0062] Control unit 300 includes a DC relay and an AC contactor. One end of the main contact KA1 of the DC relay is connected to the N-phase and A-phase of the power supply 400, and the other end of the main contact KA1 of the DC relay is connected to the neutral wire of the AC contactor. One end of the main contact KM1 of the AC contactor is connected to the A-phase, B-phase, and C-phase of the power supply 400, and the other end of the main contact KM1 of the AC contactor is connected to one end of the auxiliary contact KM2 of the AC contactor. The other end of the auxiliary contact KM2 of the AC contactor is connected to the electric control unit 100. After receiving a power-off command signal, control unit 300 disconnects the power supply 400 via the main contact KA1 of the DC relay. The N-phase and A-phase of the AC contactor, i.e., the main contacts of the KM1 AC contactor, are then disconnected from the power supply. At this time, the auxiliary contacts of the KM2 AC contactor, which are mechanically connected to the main contacts of the KM1 AC contactor, are sequentially disconnected. The control unit 300 cuts off the A-phase, B-phase, and C-phase of the power supply 400 to the electric control unit 200, so that the switch unit connected to one end of the electric control unit 100 remains in its original position. In this embodiment, a 24VDC / 10A DC relay is selected, and a 220VAC / 10A AC contactor is selected. The electric control unit 200 is powered by a 380V AC power supply. The first to fifth logic chips are AND gate chips and / or NOT gate chips.

[0063] Based on the above analysis, it can be seen that when the main control circuit board of the electric control unit malfunctions or the control signal cable short-circuits in the existing technology, the electric control unit will malfunction.

[0064] To address the aforementioned technical problems, this application provides a solution that designs a distributed controller to perform logical judgments on various control signals output by the electric control unit during the production process. This accurately obtains control signals for abnormal short circuits, preventing electric door malfunctions during petrochemical boiler production. Furthermore, a branch circuit control unit is designed within the electric control unit. When the electric control unit malfunctions or the control signal experiences an abnormal short circuit, the N-phase and A-phase of the power supply are disconnected via the KA1 main contact of the DC relay in the control unit. After the KA1 main contact is disconnected, the KM1 main contact and KM2 auxiliary contact of the AC contactor connected in series at the other end of the DC relay disconnect the power supply, thereby ensuring that the switch unit connected to the load electric door remains in its original position. This prevents malfunctions of the electric door during petrochemical boiler production that could lead to serious accidents.

[0065] The protection device for abnormal power failure of the switch-type electric door provided in this application embodiment can be specific hardware on the device or software or firmware installed on the device. The implementation principle and technical effects of the device provided in this application embodiment are the same as those of the foregoing method embodiments. For the sake of brevity, any parts not mentioned in the device embodiment can be referred to the corresponding content in the foregoing method embodiments. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the foregoing device and unit can be referred to the corresponding process in the above method embodiments, and will not be repeated here.

[0066] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interface; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0067] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0068] In addition, the functional units in the embodiments provided in this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0069] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0070] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0071] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A protection method for abnormal power failure of a switch-type electric door, characterized in that, The method is applied to a protection device for abnormal power failure of a switch-type electric door. The device includes: a distributed controller, an electric control unit, and a control unit. The control unit consists of a DC relay and an AC contactor. The distributed controller is connected to the control terminal of the DC relay. One end of the KA1 main contact of the DC relay is connected to the N-phase and A-phase of the power supply. The other end of the KA1 main contact of the DC relay is connected to the neutral wire of the AC contactor. One end of the KM1 main contact of the AC contactor is connected to the power supply. The other end of the KM1 main contact of the AC contactor is connected to one end of the KM2 auxiliary contact of the AC contactor. The other end of the KM2 auxiliary contact of the AC contactor is connected to the electric control unit. The electric control unit is connected to the load electric door device through a switching unit. When the electric control unit enters the working state, according to a preset time interval, the distributed controller performs logical judgment on each control signal output by the electric control unit at the current time. If at least one of the multiple control signals of the load electric door device controlled by the electric control unit is in an interrupted state, the distributed controller sends a power-off command signal to the control unit. After receiving the power-off command signal, the main contact of the DC relay built into the control unit disconnects the N-phase and A-phase of the power supply. After the main contact of KA1 is disconnected, the main contact of the AC contactor KM1 and the auxiliary contact of the AC contactor KM2, which is mechanically connected to the main contact of the AC contactor KM1, are disconnected, so that the control unit cuts off the power supply to the electric control unit. After receiving a power-off command signal, the control unit disconnects the N-phase and A-phase of the power supply via the KA1 main contact of the built-in DC relay. After the KA1 main contact is disconnected, the KM1 main contact of the AC contactor and the KM2 auxiliary contact of the AC contactor, which is mechanically connected to the KM1 main contact, are also disconnected, thereby cutting off the power supply to the electric control unit. This includes: When the control unit receives a power-off command signal, the iron core of the DC relay disconnects the N-phase and A-phase of the power supply at one end of the KA1 main contact under the action of the spring; After the KA1 main contact disconnects the power supply, the KM1 main contact of the AC contactor connected in series with the other end of the DC relay disconnects, and the KM2 auxiliary contact of the AC contactor mechanically connected to the KM1 main contact disconnects. The control unit cuts off the power supply to the electric control unit, so that the switching unit remains in its original position.

2. The method according to claim 1, characterized in that, Before the distributed controller performs logical judgments on each control signal output by the current electric control unit through its built-in logic chip and triggers, it also includes: In response to a user operation command, the electric control unit outputs a high-level signal for a preset duration to the distributed controller, and the distributed controller and the electric control unit are interlocked and connected under the action of the high-level signal. The distributed controller acquires multiple control signals output by the electric control unit at any given moment in real time. These multiple control signals are used to characterize the status signals indicating whether the feedback load electric door device is operating normally.

3. The method according to claim 2, characterized in that, When the electric control unit enters the working state, according to a preset time interval, the distributed controller performs logical judgments on each control signal output by the electric control unit at the current time, using the built-in logic chip and triggers, including: When the electric control unit enters the working state, it inputs a control signal with a preset time interval to the distributed controller; The distributed controller uses built-in logic chips and triggers to make logical judgments on the current operating status of all state signals in the feedback load electric gate device. If all status signals are in the fully activated state, the distributed controller outputs a high-level signal to the electric control unit, and the electric control unit is in the activated state.

4. The method according to claim 3, characterized in that, The method further includes: If all or some of the status signals are momentarily turned off, the distributed controller outputs a low-level signal to the electric control unit, and the electric control unit is in an interrupted state.

5. The method according to claim 1, characterized in that, If at least one of the multiple control signals of the load electric door device controlled by the electric control unit is in an interrupted state, the distributed controller sends a power-off command signal to the control unit, including: If all or part of the status signals in the control signals are turned off momentarily, then at least one control signal of the load electric door device controlled by the electric control unit is in an interrupted state. The distributed controller determines whether the high-level signal received at the R terminal of the trigger is less than the high-level signal received at the S terminal. If it is less, the output terminal of the trigger sends a power-off command signal to the control unit.

6. The method according to claim 1, characterized in that, The DC relay is a 24VDC / 10A relay, and the AC contactor is a 220VAC / 10A contactor.

7. The method according to claim 1, characterized in that, The electric control unit is powered by a 380V AC power supply.

8. The method according to claim 1, characterized in that, The logic chip is selected from AND gate chips and / or NOT gate chips.

9. The method according to claim 1, characterized in that, The trigger is an RS trigger.

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