Fixed-length lifting system control device

Abstract

The utility model discloses a control device for a fixed-length lifting system, which belongs to the technical field of profile production and is characterized in that an old fixed-length lifting control system is transformed by utilizing a Siemens 6RA80 direct-current speed regulating device under the existing condition; the system has the advantages of high cost performance ratio, stable performance, reliable operation, high adjustment precision, convenient parameter setting, complete self protection, low failure rate and the like, and completely meets the technological requirements of a rolling production line.

Description

Technical Field

[0001] This utility model relates to the field of profile production technology, and more specifically, to a control device for a fixed-length lifting system. Background Technology

[0002] When shearing steel billets, the cutting length needs to be controlled by a fixed-length machine. Since the original fixed-length lifting control system is an analog control system from the 1980s, it has been used for nearly 40 years. The materials and spare parts used have been discontinued, and various malfunctions have gradually increased, affecting normal production operations.

[0003] Therefore, a control device for a fixed-length lifting system is proposed to address the above problems. Utility Model Content

[0004] 1. Technical problems to be solved

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a control device for a fixed-length lifting system. Under existing conditions, it can utilize a Siemens 6RA80 DC speed control device to upgrade the old fixed-length lifting control system. The system has advantages such as a high performance-price ratio, stable performance, reliable operation, high adjustment accuracy, convenient parameter setting, complete self-protection, and low failure rate, and fully meets the process requirements of the rolling production line.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A control device for a fixed-length lifting system includes:

[0009] The DC speed control device is connected to the fixed-length lifting motor through the circuit in the electrical cabinet;

[0010] The DC speed control system uses a fixed setpoint signal source. Based on the setpoint channel, parameters P50430.0 = 11 and P50430.1 = 14 are set to determine the forward and reverse control pins of the fixed-length lifting motor.

[0011] Fixed-length lifting control system.

[0012] Furthermore, the armature voltage parameter setting of the DC speed control device is 380V, the excitation voltage parameter setting is 400V, and the speed control parameters include a reference speed / rate of 650.

[0013] Furthermore, the fixed-length lifting control system includes:

[0014] Power input unit;

[0015] Power conversion and distribution unit;

[0016] Control circuit unit;

[0017] Operation control unit;

[0018] Output and feedback units.

[0019] Furthermore, the power input unit includes a three-phase power input (L1, L2, L3) directly connected to three separate fuses (FU), one for each phase, to protect subsequent circuits.

[0020] Furthermore, the power conversion and distribution unit includes:

[0021] Fuse (FU): Each fuse is connected to a corresponding contactor (4U1, 4V1, 4W1) to control the power supply of the motor;

[0022] Transformer: A transformer is connected from the three-phase input through connection points (3U1, 3W1) to reduce the three-phase 404V voltage to 220V to supply the control circuit and other low-voltage equipment.

[0023] Furthermore, the control circuit unit includes:

[0024] 220V to 24V converter: The output of the transformer is 220V AC, which is stepped down to 24V DC through the secondary winding of the transformer to supply power to the low-voltage control circuit.

[0025] Relay: Main control relay (K0): Controls the start and stop of the entire system;

[0026] 80A load relay (K1): May be used to start or control larger loads;

[0027] Direction control relays (K2, K3): control the forward and reverse directions of machine operation respectively.

[0028] Furthermore, the operation control unit includes:

[0029] Start button (SB1): Connected to the control coil of K0. When pressed, K0 is engaged, starting the system.

[0030] Stop button (SB2): Connected to the control coil of K0. Pressing it disconnects K0 and stops the system.

[0031] Direction selection switch (SB3): Controls the engagement of K2 or K3 depending on the position.

[0032] Furthermore, the output and feedback unit includes:

[0033] Ammeter and voltmeter: Connected to the main circuit, used to monitor the current and voltage status of the system to ensure that it operates within safe parameters;

[0034] Emergency stop switch (SW1): Directly controls the on / off of the main power supply, used to quickly cut off the power supply in an emergency.

[0035] 3. Beneficial effects

[0036] Compared with existing technologies, the advantages of this utility model are:

[0037] (1) To meet production requirements, the fixed length lifting control system operates stably.

[0038] (2) The failure rate of the fixed length lifting control system has been significantly reduced.

[0039] (3) Reduce the cost of materials, spare parts and labor for the fixed length lifting control system. Attached Figure Description

[0040] Figure 1 This is the wiring diagram of the fixed-length lifting control system of this utility model;

[0041] Figure 2 This is a directional design diagram of the DC speed control system of this utility model. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0043] Example:

[0044] Please see Figure 1-2 Design of a fixed-length lifting control system:

[0045] Siemens 6RA80 DC speed control device selection: Based on the motor nameplate, the parameters of the fixed-length lifting motor are as follows:

[0046]

[0047]

[0048] Based on the above motor data and referring to the Siemens 6RA80 selection manual, the final model is determined to be: 6RA8078-6DV62-0AA0, with the following technical parameters:

[0049]

[0050] Please see Figure 2 DC speed control system direction design: Fixed setpoint signal source, according to the setpoint channel, set parameters P50430.0=11, P50430.1=14, determine the forward and reverse direction control pins of the fixed length lifting motor.

[0051] Please refer to the table below for the parameter design of the 6RA80 DC speed control device.

[0052]

[0053]

[0054] During the commissioning of the 6RA80, a total of four control loops needed to be tuned or optimized: excitation current control, armature current control, speed control, and EMF closed-loop control. The optimization steps are as follows:

[0055] P50051 = 24 Optimizes excitation current control;

[0056] P50051 = 25 Optimizes armature current control;

[0057] P50051 = 26 Optimizes speed control;

[0058] P50051 = 25 Optimize EMF control.

[0059] Regarding material preparation:

[0060] 1. The fixed-length lifting rectifier cabinet was dismantled and modified for use as an electrical cabinet.

[0061] 2. The original power supply line is used as the power source, and the original main circuit and control circuit cables are used, so there is no need to lay new cables to the transmission end.

[0062] 3. Main electrical components and their specifications:

[0063] Two 105RSM F 500V / 250A fuses

[0064] 24V power supply S-240-24 (one)

[0065] One 3P D32 circuit breaker

[0066] Three 2P D20 circuit breakers

[0067] Contactor CJ20-160, one

[0068] Four 24V relays.

[0069] Please see Figure 1 ,

[0070] 1. Power connection

[0071] Main power supply connection: The main power supply is first connected to the system through a main circuit breaker (3P D32) to provide the overall power switching function and protect the system from power failure.

[0072] 24V Control Power Supply: The main power supply is stepped down to 24V via a transformer for use in the control circuit. The 24V power supply (S-240-24) powers the control circuit and low-voltage control devices (such as relays).

[0073] 2. Siemens 6RA80 DC speed control device

[0074] The power supply for the DC speed control unit is connected from the main power supply to the Siemens 6RA80 unit via a specific fuse (105RSM F500V / 250A) to ensure that the equipment can quickly cut off power in case of current overload.

[0075] Motor connection: The armature and excitation winding of the fixed-length lifting motor are respectively connected to the corresponding output terminals of Siemens 6RA80.

[0076] 3. Protection and Control

[0077] Fuse: Used to protect the main circuit and control circuit from damage caused by overcurrent.

[0078] Circuit breakers: This includes multiple circuit breakers (2P D20) for distributing the circuit, each responsible for the power control and protection of a different section.

[0079] Contactor (CJ20-160): Used to control the starting and stopping of high-current equipment, typically controlling the main power supply of motors.

[0080] Relays: Used to achieve the function of controlling high voltage with low voltage, and are often used to control the engagement of contactors.

[0081] 4. Control Logic

[0082] Controller: All control signals are managed through a programmable logic controller (PLC), which is programmed to set parameters (such as armature voltage, excitation voltage, speed, etc.) and monitor the Siemens 6RA80.

[0083] Signal source and feedback: The control system may include position sensors and speed sensors, which input feedback signals to the PLC to adjust control parameters as needed, ensuring precise control of the fixed-length lifting system.

[0084] The above are merely preferred embodiments of this utility model; however, the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and its improved concept, should be included within the scope of protection of this utility model.

Claims

1. A control device for a fixed-length lifting system, characterized in that: include: The DC speed control device is connected to the fixed-length lifting motor through the circuit in the electrical cabinet; The DC speed control system uses a fixed setpoint signal source. Based on the setpoint channel, parameters P50430.0 = 11 and P50430.1 = 14 are set to determine the forward and reverse control pins of the fixed-length lifting motor. The fixed-length lifting control system includes: Power input unit; Power conversion and distribution unit; Control circuit unit; Operation control unit; Output and feedback units.

2. The control device for a fixed-length lifting system according to claim 1, characterized in that: The armature voltage parameter setting of the DC speed control device is 380V, the excitation voltage parameter setting is 400V, and the speed control parameters include a reference speed / rate of 650.

3. The control device for a fixed-length lifting system according to claim 1, characterized in that: The power input unit includes a three-phase power input (L1, L2, L3) that is directly connected to three separate fuses (FU), one for each phase, to protect the downstream circuitry.

4. The control device for a fixed-length lifting system according to claim 3, characterized in that: The power conversion and distribution unit includes: Fuse (FU): Each fuse is connected to a corresponding contactor (4U1, 4V1, 4W1) to control the power supply of the motor; Transformer: A transformer is connected from the three-phase input through connection points (3U1, 3W1) to reduce the three-phase 404V voltage to 220V to supply the control circuit and other low-voltage equipment.

5. The control device for a fixed-length lifting system according to claim 4, characterized in that: The control circuit unit includes: 220V to 24V converter: The output of the transformer is 220V AC, which is stepped down to 24V DC through the secondary winding of the transformer to supply power to the low-voltage control circuit. Relay: Main control relay (K0): Controls the start and stop of the entire system; 80A load relay (K1): May be used to start or control larger loads; Direction control relays (K2, K3): control the forward and reverse directions of machine operation respectively.

6. The control device for a fixed-length lifting system according to claim 5, characterized in that: The operation control unit includes: Start button (SB1): Connected to the control coil of K0. When pressed, K0 is engaged, starting the system. Stop button (SB2): Connected to the control coil of K0. Pressing it disconnects K0 and stops the system. Direction selection switch (SB3): Controls the engagement of K2 or K3 depending on the position.

7. A control device for a fixed-length lifting system according to claim 6, characterized in that: The output and feedback unit includes: Ammeter and voltmeter: Connected to the main circuit, used to monitor the current and voltage status of the system to ensure that it operates within safe parameters; Emergency stop switch (SW1): Directly controls the on / off of the main power supply, used to quickly cut off the power supply in an emergency.

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