CN211349082U

CN211349082U - Constant power control system of hot sawing machine

Info

Publication number: CN211349082U
Application number: CN202020232073.4U
Authority: CN
Inventors: 章琳
Original assignee: Anshan Zizhu Technology Section Steel Co ltd
Current assignee: Anshan Zizhu Heavy Special Steel Co.,Ltd.
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-08-25
Anticipated expiration: 2030-02-28

Abstract

A power detection circuit is additionally arranged on a main motor control loop and consists of a voltage transmitter, a current transformer and a current transmitter which are additionally arranged on a main motor power supply loop, output signals of the voltage transmitter and the current transmitter are transmitted to an analog input module of a PLC (programmable logic controller), and a CPU (central processing unit) of the PLC acquires transmitted signals and then carries out real-time power difference calculation with a manually set power value so as to control the saw feeding speed of a saw feeding hydraulic cylinder and realize the constant power control operation mode of the main motor. The utility model has the advantages that the constant power control system can lead the main motor of the hot sawing machine to work in a constant power mode, and in the process of sawing the rolled piece, if the sawed rolled piece is thinner, the hot sawing machine can automatically accelerate the sawing speed; if the thickness of the sawed rolled piece is thicker, the hot sawing machine can automatically reduce the sawing speed to the normal sawing speed so as to improve the production efficiency and reduce the abrasion of the saw blade.

Description

Constant power control system of hot sawing machine

Technical Field

The utility model relates to an electrical control system of hot sawing machine especially relates to a constant power electrical control system of hot sawing machine.

Background

The hot sawing machine is an important sawing device of a steel rolling production line and is used for processing head cutting and tail cutting of rolled pieces rolled by a finishing mill. The main motor of the hot saw drives the saw blade to work, and is generally controlled by a soft starter. The saw feeding action of the hot sawing machine is controlled by a hydraulic system, and a PLC system is adopted to control the opening degree of a proportional valve of the hydraulic system, so that a hydraulic cylinder and a saw feeding trolley are driven to realize the adjustment of the saw feeding speed. The working condition of the hot sawing machine is directly related to the rolling speed of the whole production line and the quality of rolled pieces. However, the existing electrical control system of the hot sawing machine has certain defects. The reason for this is that many products rolled by modern finishing mills are shaped pieces which are not only different in shape but also uneven in thickness and mass distribution in their cross-section. If the hot sawing machine works at a fixed sawing speed, the load power of the hot sawing machine at different parts can be changed, and the phenomenon not only causes the low sawing efficiency of the hot sawing machine, but also is not beneficial to the stability of equipment and is easy to cause the damage of the equipment.

Disclosure of Invention

An object of the utility model is to overcome above-mentioned prior art not enough, provide a constant power control system of hot sawing machine, make its in the operation process that saw cuts to work with a invariable power, when realizing saw cutting the position of the different thickness of rolled piece, the speed of advancing saw also can change thereupon.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the constant power control system of the hot sawing machine comprises a main motor control loop, a saw feeding hydraulic cylinder control loop, an auxiliary circuit and the like, and is characterized in that a power detection circuit of a main motor is additionally arranged on the main motor control loop and consists of a three-phase voltage transmitter, three current transformers and a current transmitter which are additionally arranged on a power supply loop of the main motor, and output signals of the voltage transmitter and the current transmitter are transmitted to an analog quantity input module of a PLC control system.

The current transformer transmits the acquired three-phase current of the main motor to a three-phase current transmitter, and the current transmitter converts the input three-phase current of the current transformer into 4-20mA current and provides the 4-20mA current to a current analog quantity input module of the PLC control system; the voltage transmitter converts the collected three-phase alternating voltage of the main motor into 4-20mA current to be provided for a voltage analog input module of the PLC control system; the voltage/current analog input module carries out A/D conversion on the collected voltage and the 4-20mA current of the current transmitter into digital quantity signals, and then transmits the digital quantity signals to the CPU for real-time power calculation, provides feedback signals for the constant power control system, and controls the opening degree of a proportional valve of a hydraulic system according to a deviation signal of the set power and the detected power, so that the push rod speed of a hydraulic cylinder and the saw feeding speed of the hot sawing machine can be adjusted.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a after the constant power control system installed the hot saw additional on, make the mode that the hot saw can the constant power work, after the constant power operational mode was carried out to main motor, not only can improve the production efficiency of hot saw, can also improve the life of hot saw.

Drawings

Fig. 1 is a motor main loop control schematic diagram of a constant power control system of a hot saw.

Fig. 2 is a control schematic diagram of an operating loop of a constant power control system of a hot saw.

Fig. 3 is a partial schematic circuit diagram of a constant power control PLC system of the hot sawing machine.

Detailed Description

The constant power control system of the hot sawing machine according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a motor main loop control schematic diagram of a constant power control system of a hot saw. A main control unit of a constant power control system of the hot sawing machine adopts a Schneider soft starter ATS48C48Q to form a forward and reverse rotation control loop of a three-phase motor. The power detection circuit of a main motor is additionally arranged on a main loop power supply and consists of a three-phase voltage transmitter BD-4V3 (brand name of Ankery), three current transformers LMZ1-0.5 and a current transmitter BD-3I3 (brand name of Ankery) which are additionally arranged on a power loop, the current transformers can adopt any conventional products, and the specification only needs to be matched with the current transmitters. Fig. 3 is a control schematic diagram of an operation loop of the constant power control system, which is a conventional mature circuit and is not described herein again.

Fig. 3 is a partial schematic circuit diagram of a PLC control system in a constant power control system of a hot saw. The PLC control system takes a Siemens S7-200PLC controller as a core, receives 4-20mA current signals output by a voltage transmitter and a current transmitter through two same analog quantity expansion modules 6ES7231-0HC22-0XA0, converts the 4-20mA current signals into digital quantity through the analog quantity expansion modules 6ES7231-0HC22-0XA0, and transmits the digital quantity to a CPU core processor of the PLC controller, and the CPU core processor carries out power calculation and real-time power difference calculation with a manually set power value, controls the sawing speed of a sawing hydraulic cylinder according to the calculated difference result, and realizes the constant power operation mode of a main motor.

The three-phase power supply of the main loop needs three current transformers, each current transformer collects one-phase current, the collected three-phase current is sent to a three-phase current transmitter BD-3I3, the current transmitter BD-3I3 converts the input three-phase current into a 4-20mA current signal, and the current signal is provided for an analog input module 6ES7231-0HC22-0XA0 of the PLC; the voltage transmitter BD-4V3 converts the collected three-phase AC380V alternating voltage of the main motor into a 4-20mA current signal, and provides the 4-20mA current signal to an analog input module 6ES7231-0HC22-0XA0 of the PLC; the analog input module 6ES7231-0HC22-0XA0 of the PLC controller carries out A/D conversion on the acquired voltage and the 4-20mA current of the current transducer into digital quantity signals, the digital quantity signals are transmitted to a CPU for real-time power calculation, the analog quantity signals are transmitted to the analog output module 6ES 7232-0 HB22-0XA0 of the PLC control unit according to the deviation calculation result of the set power and the detected power, and the analog output module 6ES 7232-0 HB22-0XA0 controls the opening degree of a proportional valve of a hydraulic system, so that the push rod speed of a hydraulic cylinder and the sawing speed of the hot sawing machine are adjusted.

In the production operation, after a constant power control system of the hot sawing machine is switched on, a main motor of the hot sawing machine works in a constant power mode, and in the process of sawing a rolled piece, if the sawed rolled piece is thinner, the hot sawing machine can automatically accelerate the sawing speed so as to improve the working efficiency; if the thickness of the sawed rolled piece is thicker, the hot sawing machine can automatically reduce to the normal sawing speed so as to avoid the abrasion of the saw blade.

The embodiment of the utility model adopts

The fixed hot saw and the main motor are Y2355L-6 in model and 250KW in power, the soft starter is Schneider ATS48C48Q in model, the current transformer in the power detection loop is LMZ1-0.5 in model, the current transducer is BD-3I3 in Andrew, and the voltage transducer is BD-4V3 in Andrew. The core of the control loop is the S7-200 module, as shown in the following table:

TABLE 1 composition of the control System

The proportional valve is ATOS E-RI-AE-05F/I10, and the opening degree can be adjusted by a current signal of 4-20 mA. Through the deviation calculation of the power detection value and the set value, the S7-200CPU controls the output current signal 4-20mA of the analog output module to adjust the opening degree of the proportional valve, and further adjusts the sawing speed.

Claims

1. A constant power control system of a hot sawing machine comprises a main motor control loop, a saw feeding hydraulic cylinder control loop, an auxiliary circuit and the like, and is characterized in that a power detection circuit of a main motor is additionally arranged on the main motor control loop and consists of a three-phase voltage transmitter, three current transformers and a current transmitter which are additionally arranged on a power supply loop of the main motor, and output signals of the voltage transmitter and the current transmitter are transmitted to an analog quantity input module of a PLC control system;

the current transformer transmits the acquired three-phase current of the main motor to a three-phase current transmitter, and the current transmitter converts the input three-phase current of the current transformer into 4-20mA current and provides the 4-20mA current to a current analog quantity input module of the PLC control system; the voltage transmitter converts the collected three-phase alternating voltage of the main motor into 4-20mA current to be provided for a voltage analog input module of the PLC control system; the voltage/current analog input module carries out A/D conversion on the collected voltage and the 4-20mA current of the current transmitter into digital quantity signals, then transmits the digital quantity signals to the CPU for real-time power calculation, provides feedback signals for the constant power control system, and controls the opening degree of a proportional valve of the hydraulic system according to deviation signals of the set power and the detected power.