Dual-power switching system suitable for settling tank stirring motor

Abstract

The utility model relates to a dual-power-supply switching system suitable for a settling tank stirring motor, which belongs to the technical field of aluminum oxide production control and comprises a main power supply, a standby power supply, a zero-cross detection module, an overload protection module, a power supply switching module, a relay driving module and a stirring motor. The main power supply and the standby power supply are both connected with a zero-cross detection module and an overload protection module, the zero-cross detection module and the overload protection module are both connected with a power supply switching module, the power supply switching module is connected with a stirring motor through a relay driving module, and the power supply switching module is further connected with a main controller and a standby controller. According to the utility model, the main power supply and the standby power supply can be automatically switched, the power supply fault problem or the overload problem caused by material deposition can be overcome, and the stable and continuous operation of the settling tank stirring motor in the aluminum oxide production can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of alumina production control, and in particular relates to a dual power supply switching system suitable for a settling tank stirring motor. Background Art

[0002] Currently, a variety of automated control systems are used in the industrial sector. As the energy source for these systems, the role of power supplies is self-evident. If a hardware failure or unexpected power outage occurs, the automated control system can cease operation, potentially leading to production accidents at specific industrial locations, resulting in safety issues and economic losses. In alumina production, the stable operation of the settling tank's agitator motor, used for solid-liquid separation, is crucial to alumina production efficiency. Sudden power outages can cause material to accumulate, resulting in significant economic losses.

[0003] The prior art discloses a dual power supply system with publication number CN116231832A, which includes a first power module, a second power module and a switching circuit. The first power module is connected to the switching circuit via a first switching circuit, and the second power module is connected to the switching circuit via a second switching module. The switching circuit is connected to an electrical device, and the electrical device is also connected to an energy storage module. After the power supply is switched, when the power module before the switch is restored, the system is still powered by the switched power supply until the switched power supply fails and the next switching is performed. However, this requires that both the first power module and the second power module adopt the main power supply standard, which is likely to increase the cost. In addition, the system lacks corresponding detection and protection modules. In the field of industrial production, it is impossible to overcome the arc and mechanical wear faults generated when switching the power supply. Utility Model Content

[0004] The technical problem solved by the utility model is to overcome the problems existing in the prior art and provide a dual power supply switching system suitable for a sedimentation tank stirring motor.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] The dual power switching system for the sedimentation tank stirring motor described in the utility model includes a main power supply, a backup power supply and a stirring motor. The main power supply and the backup power supply are both connected to a zero-crossing detection module and an overload protection module. The zero-crossing detection module and the overload protection module are both connected to a power switching module. The power switching module is connected to the stirring motor through a relay drive module.

[0007] The power switching module is also connected to a main controller and a backup controller respectively, and both the main controller and the backup controller are electrically connected to the stirring motor.

[0008] Both the main controller and the backup controller adopt PLC controller.

[0009] The main power supply is connected to the overload protection module through fuse FU1, and the backup power supply is connected to the overload protection module through fuse FU2.

[0010] The zero-crossing detection module includes a rectifier bridge, a resistor module, a filter capacitor C1 and a transistor Q1. The rectifier bridge includes a diode D1, a diode D2, a diode D3 and a diode D4 connected in series, and the diode D4 is connected to the diode D1; the resistor module includes a resistor R1, a resistor R2 and a resistor R3 connected in phase angle; the resistor R1 is connected in parallel with the diode D3 and the diode D4 at the same time, the resistor R3 is connected in parallel with the filter capacitor C1, and the filter capacitor C1 is also connected between the base and the emitter of the transistor Q1. The collector of the transistor Q1 is connected with the resistor R4.

[0011] The overload protection module includes an indication module and a self-locking module connected in parallel. The indication module includes an operation indication module and an overload indication module connected in parallel. The operation indication module includes an operation indicator light L1 and a normally open contact KM102 connected in series. The overload indication module includes an overload indicator light L2 and a normally open contact FR102 and a normally open contact FR202 connected in parallel. The self-locking module includes a normally closed contact FR101, a normally closed contact FR201, a stop button SB2, a start button SB1 and a coil KM1 connected in series. The start button SB1 is connected in parallel with the normally open contact KM102.

[0012] The power switching module includes a switching module I, a switching module II and a switching module III connected in series. The switching module I includes a fuse FU3, a normally open contact KM301, a normally open contact KM401 and a coil KT1 connected in series. The coil KT1 is connected in parallel with a normally open contact KT101 and a coil KA1 connected in series. The coil KT1 is also connected in parallel with a normally closed contact KM201 and a coil KM5 connected in series. The switching module II includes a coil KM3 and a coil KM4 connected in parallel. The switching module III includes a coil KT2, a normally closed contact KA101 and a normally closed contact KM503 connected in series. The coil KT2 is connected in parallel with a coil KM2 and a normally open contact KT201 connected in series. The power switching module also includes a normally open contact KM501 connected to the main power line and a normally open contact KM502 connected to the backup power line.

[0013] The relay drive module includes a transistor Q2, the base of which is connected to a resistor R5, the collector of which is connected to a coil KA2, and the coil KA2 is connected to a normally closed contact KA201 and a normally open contact KA202 connected in parallel; the emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is grounded through a diode D5.

[0014] The utility model has the following beneficial effects:

[0015] The utility model can ensure the stability and continuity of the operation of the sedimentation tank stirring motor during the alumina production process. The safety of the sedimentation tank stirring motor during operation is improved through the zero-crossing detection module, the overload protection module and the relay drive module, and effectively ensure the safe, stable and continuous production of alumina. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall connection diagram of the utility model;

[0017] Figure 2 This is the circuit diagram of the zero-crossing detection module;

[0018] Figure 3 This is the circuit diagram of the overload protection module;

[0019] Figure 4 This is the circuit diagram of the power switching module;

[0020] Figure 5 This is the circuit diagram of the relay drive module.

[0021] Among them: 1. Main power supply; 2. Backup power supply; 3. Zero-crossing detection module; 4. Overload protection module; 5. Power switching module; 6. Relay drive module; 7. Stirring motor; 8. Main controller; 9. Backup controller. DETAILED DESCRIPTION

[0022] like Figures 1 to 5 As shown, the dual power switching system suitable for the sedimentation tank stirring motor described in the utility model includes a main power supply 1, a backup power supply 2 and a stirring motor 7. The main power supply 1 and the backup power supply 2 are both connected to a zero-crossing detection module 3 and an overload protection module 4. The zero-crossing detection module 3 and the overload protection module 4 are both connected to a power switching module 5. The power switching module 5 is connected to the stirring motor 7 through a relay drive module 6.

[0023] The power switching module 5 is further connected to a main controller 8 and a backup controller 9 respectively, and both the main controller 8 and the backup controller 9 are electrically connected to the stirring motor 7 .

[0024] Both the main controller 8 and the backup controller 9 are PLC controllers.

[0025] The main power supply 1 is connected to the overload protection module 4 through the fuse FU1, and the backup power supply 2 is connected to the overload protection module 4 through the fuse FU2.

[0026] The zero-crossing detection module 3 includes a rectifier bridge, a resistor module, a filter capacitor C1 and a transistor Q1. The rectifier bridge includes a diode D1, a diode D2, a diode D3 and a diode D4 connected in series, and the diode D4 is connected to the diode D1; the resistor module includes a resistor R1, a resistor R2 and a resistor R3 connected in phase angle; the resistor R1 is connected in parallel with the diode D3 and the diode D4 at the same time, the resistor R3 is connected in parallel with the filter capacitor C1, and the filter capacitor C1 is also connected between the base and the emitter of the transistor Q1. The collector of the transistor Q1 is connected with the resistor R4.

[0027] The overload protection module 4 includes an indication module and a self-locking module connected in parallel, the indication module includes an operation indication module and an overload indication module connected in parallel, the operation indication module includes an operation indicator light L1 and a normally open contact KM102 connected in series, the overload indication module includes an overload indicator light L2 and a normally open contact FR102 and a normally open contact FR202 connected in parallel; the self-locking module includes a normally closed contact FR101, a normally closed contact FR201, a stop button SB2, a start button SB1 and a coil KM1 connected in series; the start button SB1 is connected in parallel with the normally open contact KM102.

[0028] The power switching module 5 includes a switching module I, a switching module II and a switching module III connected in series. The switching module I includes a fuse FU3, a normally open contact KM301, a normally open contact KM401 and a coil KT1 connected in series. The coil KT1 is connected in parallel with a normally open contact KT101 and a coil KA1 connected in series. The coil KT1 is also connected in parallel with a normally closed contact KM201 and a coil KM5 connected in series. The switching module II includes a coil KM3 and a coil KM4 connected in parallel. The switching module III includes a coil KT2, a normally closed contact KA101 and a normally closed contact KM503 connected in series. The coil KT2 is connected in parallel with a coil KM2 and a normally open contact KT201 connected in series. The power switching module 5 also includes a normally open contact KM501 connected to the main power supply 1 line and a normally open contact KM502 connected to the backup power supply 2 line.

[0029] The relay drive module 6 includes a transistor Q2, the base of which is connected to a resistor R5, the collector of which is connected to a coil KA2, and the coil KA2 is connected to a normally closed contact KA201 and a normally open contact KA202 connected in parallel; the emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is grounded through a diode D5.

[0030] It should be noted that in the context description: QF represents circuit breaker, FR represents thermal relay, KM represents AC contactor, KT represents time delay relay, KA represents intermediate relay, L represents indicator light, SB represents button, and the numbers after the letters are only used to distinguish similar electrical components rather than to describe their specific order; in addition, the contacts are controlled by the corresponding relays or coils, such as the normally closed contact FR101 and the normally open contact FR102 are both controlled by thermal relay FR1, and the normally open contact KM101, normally open contact KM102 and normally closed contact KM103 are all controlled by coil KM1, and the same applies to others.

[0031] Specifically, such as Figure 2 As shown, when the main power supply 1 or the backup power supply 2 is supplying power, AC power is input to the zero-crossing detection module 3 and converted into DC power by the rectifier bridge. The output DC power is divided by the resistor module and then smoothed by the filter capacitor C1. Finally, the transistor Q1 detects the zero-crossing point and outputs the corresponding level.

[0032] Specifically, such as Figure 3 As shown, taking the main power supply 1 as an example, the overload protection module 4 is connected to the main power supply 1 through the circuit breaker QF3, the circuit breaker QF3 is closed, the start button SB1 is pressed, the coil KM1 is energized and attracted, the normally open contact KM101 and the normally open contact KM102 are closed, the operation indicator light L1 is on, and the stirring motor 7 is in normal operating state; when the thermal relay FR1 detects an overload, the normally closed contact FR101 is disconnected, the normally open contact FR102 is closed, the coil KM1 loses power and is released, the normally open contact KM101 and the normally open contact KM102 are disconnected, the operation indicator light L1 is off, and the overload indicator light L2 is on, reminding the operator that the stirring motor 7 has an overload fault and needs to be cleared of materials in time.

[0033] Specifically, such as Figure 4 As shown, the power switching module 5 is used to automatically switch between the main power supply 1 and the backup power supply 2. During the alumina production process, when the circuit breaker QF1 is closed, the coils KM3 and KM4 are energized and attracted, causing the normally open contacts KM3 and KM4 to close. The coils KM5 and KT1 are energized and attracted, causing the normally open contacts KM501 and KM502 to close and the normally closed contact KM503 to open. The normally open contact KT1 is closed, causing the coil KA1 to energize and the normally closed contact KA101 to open. At this time, the main power supply 1 supplies power to the stirring motor 7. When the main power supply 1 fails, coil KM5, coil KA1 and coil KT1 lose power and release, causing the normally closed contact KM503 and the normally closed contact KA101 to return to the closed state. At this time, coil KT2 is energized and attracted, causing the normally open contact KT201 to close after a delay of one to two seconds. After closing, coil KM2 is energized and attracted, causing the normally open contact KM201 to close and the normally closed contact KM202 to open. At this time, the main power supply 1 switches to the backup power supply 2 to power the stirring motor 7.

[0034] Specifically, such as Figure 5 As shown, the relay drive module 6 amplifies the control signal through the transistor Q2 to ensure that the normally open contacts and normally closed contacts in the system can reliably and quickly respond to the control signal even when the current output by the coil is limited.

[0035] During the alumina production process, the zero-crossing detection module 3 can reduce arcing and mechanical wear during the switching process between the main power supply 1 and the backup power supply 2, avoid voltage shock to the stirring motor 7 during the switching process, and ensure the continuity and stability of the material stirring process in the sedimentation tank; the overload protection module 4 can effectively protect the stirring motor 7, because the stirring motor 7 will be overloaded due to various reasons such as material accumulation, impeller damage or improper operation during the stirring operation in the sedimentation tank, and the overload protection module 4 will cut off the power supply according to the safety threshold to prevent the stirring motor 7 from overheating due to overload and protect the motor from damage; the relay drive module 6 can respond quickly to achieve precise control of the stirring motor 7.

Claims

1. A dual power supply switching system for a settling tank stirring motor, comprising a main power supply (1), a backup power supply (2) and a stirring motor (7), characterized in that: The main power supply (1) and the backup power supply (2) are both connected to a zero-crossing detection module (3) and an overload protection module (4); the zero-crossing detection module (3) and the overload protection module (4) are both connected to a power switching module (5); and the power switching module (5) is connected to a stirring motor (7) via a relay drive module (6).

2. The dual power switching system for a sedimentation tank stirring motor according to claim 1, characterized in that: The power switching module (5) is also connected to a main controller (8) and a backup controller (9), respectively. Both the main controller (8) and the backup controller (9) are electrically connected to the stirring motor (7).

3. The dual power switching system for a sedimentation tank stirring motor according to claim 2, characterized in that: The main controller (8) and the standby controller (9) are both PLC controllers.

4. The dual power switching system for a sedimentation tank stirring motor according to claim 1, characterized in that: The main power supply (1) is connected to the overload protection module (4) via a fuse FU1, and the backup power supply (2) is connected to the overload protection module (4) via a fuse FU2.

5. The dual power switching system for a sedimentation tank stirring motor according to claim 1, characterized in that: The zero-crossing detection module (3) comprises a rectifier bridge, a resistor module, a filter capacitor C1 and a transistor Q1, wherein the rectifier bridge comprises a diode D1, a diode D2, a diode D3 and a diode D4 connected in series, and the diode D4 is connected to the diode D1; the resistor module comprises a resistor R1, a resistor R2 and a resistor R3 connected in phase angle; the resistor R1 is connected in parallel with the diode D3 and the diode D4, the resistor R3 is connected in parallel with the filter capacitor C1, the filter capacitor C1 is further connected between the base and the emitter of the transistor Q1, and the collector of the transistor Q1 is connected with the resistor R4.

6. The dual power switching system for a sedimentation tank stirring motor according to claim 1, characterized in that: The overload protection module (4) comprises an indication module and a self-locking module connected in parallel, the indication module comprises an operation indication module and an overload indication module connected in parallel, the operation indication module comprises an operation indicator light L1 and a normally open contact KM102 connected in series, the overload indication module comprises an overload indicator light L2 and a normally open contact FR102 and a normally open contact FR202 connected in parallel; the self-locking module comprises a normally closed contact FR101, a normally closed contact FR201, a stop button SB2, a start button SB1 and a coil KM1 connected in series; the start button SB1 is connected in parallel with the normally open contact KM102.

7. The dual power switching system for a sedimentation tank stirring motor according to claim 1, characterized in that: The power switching module (5) includes a switching module I, a switching module II, and a switching module III connected in series. The switching module I includes a fuse FU3, a normally open contact KM301, a normally open contact KM401, and a coil KT1 connected in series. The coil KT1 is connected in parallel with a normally open contact KT101 and a coil KA1 connected in series. The coil KT1 is also connected in parallel with a normally closed contact KM201 and a coil KM5 connected in series. The switching module II includes a coil KM3 and a coil KM4 connected in parallel. The switching module III includes a coil KT2, a normally closed contact KA101, and a normally closed contact KM503 connected in series. The coil KT2 is connected in parallel with a coil KM2 and a normally open contact KT201 connected in series. The power switching module (5) also includes a normally open contact KM501 connected to a main power supply (1) circuit and a normally open contact KM502 connected to a backup power supply (2) circuit.

8. The dual power switching system for a sedimentation tank stirring motor according to claim 1, characterized in that: The relay drive module (6) comprises a transistor Q2, the base of which is connected to a resistor R5, the collector of which is connected to a coil KA2, and the coil KA2 is connected to a normally closed contact KA201 and a normally open contact KA202 connected in parallel; the emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is grounded via a diode D5.

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