阅读说明：本技术 加热炉精准出钢自动控制系统及控制方法 (Automatic control system and control method for accurate tapping of heating furnace ) 是由 邹淑峰 赵晓 曹立棋 位震 黄友堂 张长军 王辉 张亮亮 马岩 刘延亮 刘振凯 于 2020-06-29 设计创作，主要内容包括：本发明涉及一种加热炉精准出钢自动控制系统及控制方法,包括速度反馈单元、加热炉PLC控制单元、现场信号反馈单元、出炉辊道控制单元、HMI操作单元,通过控制坯料从加热炉移动至主轧机过程,使加热炉自动控制系统与轧线主轧机速度形成闭环控制,使坯料自动连续、准确无误地送入主轧机,物料供给节奏稳定在4.5秒-5.3秒之间,前后两支坯料间隔时间保持在1秒以内,波动范围由原来的3秒稳定在现在的1秒内,降低了操作工的劳动强度,加热炉出钢区域实现无人操作的稳定出钢节奏,提高了产量。(The invention relates to an automatic control system and a control method for accurate tapping of a heating furnace, which comprises a speed feedback unit, a PLC (programmable logic controller) control unit of the heating furnace, a field signal feedback unit, a tapping roller way control unit and an HMI (human machine interface) operation unit, wherein the speed of the automatic control system of the heating furnace and the speed of a main rolling mill of a rolling line form closed-loop control by controlling the process of moving a blank from the heating furnace to the main rolling mill, so that the blank is automatically, continuously and accurately fed into the main rolling mill, the material supply rhythm is stable within 4.5-5.3 seconds, the interval time between the front blank and the rear blank is kept within 1 second, the fluctuation range is stable within the current 1 second from the original 3 seconds, the labor intensity of an operator is reduced, the stable tapping rhythm of unmanned operation is realized in a tapping area of.)

1. Accurate tapping automatic control system of heating furnace, its characterized in that includes:

the speed feedback unit comprises a main motor encoder and a Siemens FM450 high-speed counting module and is used for converting and collecting the rotating speed of the No. 1 main motor;

the heating furnace PLC control unit is used for calculating variables and data related to accurate tapping and outputting a calculation result for an equipment action signal;

the on-site signal feedback unit comprises a hot metal detector arranged on a furnace discharging roller way and is used for detecting the time point acquisition of the steel billet biting into the No. 1 main motor;

the furnace discharging roller way control unit consists of a roller way and a roller way frequency converter and is used for controlling the automatic operation of the roller way, so that the roller way operates when the roller way is operated and does not operate when no action signal exists;

and the HMI operation unit is used for parameter display and adjustment.

2. The automatic control system for precise tapping of a heating furnace according to claim 1, wherein the PLC control unit of the heating furnace is Siemens S7-400 PLC.

3. The automatic control system for precise tapping of a heating furnace according to claim 1, wherein a signal of the main motor encoder is divided into two paths, one path is used for main transmission speed control, and the other path is led to a Siemens FM450 high-speed counting module for pulse counting.

4. The automatic control system for the precise tapping of the heating furnace according to claim 1, wherein the hot metal detectors are three sets, one set is arranged at the furnace door opening of the heating furnace, and the other two sets are arranged above a tapping roller way.

5. The control method of the automatic control system for the precise tapping of the heating furnace according to any one of claims 1 to 4, characterized by comprising the steps of:

1) starting from the internal action of the heating furnace, when the last blank is rotated and conveyed out of the furnace door from the heating furnace through the discharging cantilever roller way, the hot metal detector at the furnace door opening can detect that the blank completely leaves the furnace, and the walking beam automatically and positively circulates, and the blank is parked on the discharging cantilever roller way to wait for a signal command for allowing the supply of the blank;

2) the blank from the heating furnace is conveyed to a discharging roller way, the blank can generate signal output when passing through a hot metal detector on the discharging roller way, and the output signal disappears when the blank leaves the hot metal detector;

3) the distance between a hot metal detector for detecting the blank and the central line of the rolling mill No. 1 is fixed, the hot metal detector transmits a signal to a heating furnace PLC control unit when detecting the tail part of the blank, then the heating furnace PLC control unit calculates the time when the tail part of the blank passes through a main rolling mill according to the speed of a discharging roller way and the linear speed of the rolling mill, converts the number of pulses of an encoder arranged on a main motor according to the time and the current speed, sends a signal for allowing steel tapping when the calculated number of pulses is consistent with the actually acquired number of pulses of the encoder of the main motor, and waits for the blank on a discharging cantilever roller way to move to the discharging roller way through the operation of the discharging roller way and reach the position of the main rolling mill to start rolling.

Technical Field

The invention belongs to the technical field of automatic control, and particularly relates to an automatic control system and a control method for accurate tapping of a heating furnace.

Background

On a high-speed bar production line of an automatic full-continuous rolling production line in the field of metallurgy, blanks are heated by a heating furnace, then the blanks are sent into a main rolling mill to start rolling through the operation of a walking beam of the heating furnace, a cantilever roller way and a discharging roller way in a discharging furnace, the rolling time of the blank is calculated according to a signal generated when the blank is bitten into the rolling mill, the speed of the discharging roller way and the rolling speed, then the next blank is conveyed out from the heating furnace by the roller way at any moment, and the condition that once the condition is met, the walking beam of the heating furnace is controlled to move to convey the blank to the discharging roller way is met. Due to the influences of factors such as the mechanical property of the blank, the friction coefficient of a roller way, the weight and the length of the blank, the change of the friction force when the blank is bitten into a rolling mill and the like, the retention time of the blank on the roller way is greatly fluctuated, so that the steel tapping rhythm is unstable, the steel tapping interval time is always fluctuated between 3.8 seconds and 6.8 seconds, the rolling rhythm is seriously influenced, and the output per shift is reduced.

Meanwhile, once the tapping rhythm is lower than 4 seconds, an operator needs to manually shear the blanks, so that the rolling line steel piling caused by the fact that the two blanks are too close is prevented. The operation process is not inferior to the treatment of one-time steel stacking accidents, the labor intensity of operators is increased, and unnecessary blank consumption is increased.

Disclosure of Invention

The invention aims to solve the problems of unstable blank supply rhythm, high labor intensity of personnel and ineffective production, and provides an automatic control system and a control method for accurate tapping of a heating furnace.

The technical scheme adopted by the invention for solving the technical problems is as follows: accurate tapping automatic control system of heating furnace includes:

the speed feedback unit comprises a main motor encoder and a Siemens FM450 high-speed counting module and is used for converting and collecting the rotating speed of the No. 1 main motor;

the heating furnace PLC control unit is used for calculating variables and data related to accurate tapping and outputting a calculation result for an equipment action signal;

the on-site signal feedback unit comprises a hot metal detector arranged on a furnace discharging roller way and is used for detecting the time point acquisition of the steel billet biting into the No. 1 main motor;

the furnace discharging roller way control unit consists of a roller way and a roller way frequency converter and is used for controlling the automatic operation of the roller way, so that the roller way operates when the roller way is operated and does not operate when no action signal exists;

and the HMI operation unit is used for parameter display and adjustment.

Further, the heating furnace PLC control unit is Siemens S7-400 PLC.

Furthermore, the signal of the main motor encoder is divided into two paths, one path is used for main transmission speed control, and the other path is led to a Siemens FM450 high-speed counting module for pulse counting.

Furthermore, the hot metal detector has three sets, one set is arranged at the mouth of the heating furnace door, and the other two sets are arranged above the discharging roller way.

The control method of the automatic control system for accurate tapping of the heating furnace comprises the following steps:

1) starting from the internal action of the heating furnace, when the last blank is rotated and conveyed out of the furnace door from the heating furnace through the discharging cantilever roller way, the hot metal detector at the furnace door opening can detect that the blank completely leaves the furnace, and the walking beam automatically and positively circulates, and the blank is parked on the discharging cantilever roller way to wait for a signal command for allowing the supply of the blank;

2) the blank from the heating furnace is conveyed to a discharging roller way, the blank can generate signal output when passing through a hot metal detector on the discharging roller way, and the output signal disappears when the blank leaves the hot metal detector;

3) the distance between a hot metal detector for detecting the blank and the central line of the rolling mill No. 1 is fixed, the hot metal detector transmits a signal to a heating furnace PLC control unit when detecting the tail part of the blank, then the heating furnace PLC control unit calculates the time when the tail part of the blank passes through a main rolling mill according to the speed of a discharging roller way and the linear speed of the rolling mill, converts the number of pulses of an encoder arranged on a main motor according to the time and the current speed, sends a signal for allowing steel tapping when the calculated number of pulses is consistent with the actually acquired number of pulses of the encoder of the main motor, and waits for the blank on a discharging cantilever roller way to move to the discharging roller way through the operation of the discharging roller way and reach the position of the main rolling mill to start rolling.

The invention has the following beneficial effects: the invention controls the process of moving the blanks from the heating furnace to the main rolling mill, so that the automatic control system of the heating furnace and the speed of the main rolling mill of the rolling line form closed-loop control, the blanks are automatically, continuously and accurately fed into the main rolling mill, the material feeding rhythm is stabilized between 4.5 seconds and 5.3 seconds, the interval time between the front blank and the rear blank is kept within 1 second, the fluctuation range is stabilized within the current 1 second from the original 3 seconds, 2 seconds can be saved for each blank, 1300 tons of blanks are produced in one shift according to the current production rhythm, and 1.22 tons of blanks can be rolled per minute. The time can be saved by 1027 seconds to 17.1 minutes per shift, the shift yield can be increased by 1.22 tons to 17.1 minutes to 20.9 tons, the yield can be increased by 22576 tons per year, and the annual economic benefit can be increased by 22576 tons to 500 yuan to 1128.8 ten thousand yuan per year. In addition, the labor intensity of operators is reduced, the stable tapping rhythm of unmanned operation is realized in the tapping area of the heating furnace, and the yield is improved.

Drawings

FIG. 1 is a schematic structural diagram of an automatic control system for precise tapping of a heating furnace according to the present invention.

Detailed Description

The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.

As shown in fig. 1, the automatic control system for the precise tapping of the heating furnace comprises:

the speed feedback unit comprises a main motor encoder and a Siemens FM450 high-speed counting module and is used for converting and collecting the rotating speed of the No. 1 main motor;

the heating furnace PLC control unit is used for calculating variables and data related to accurate tapping and outputting a calculation result for an equipment action signal;

the on-site signal feedback unit comprises a hot metal detector arranged on a furnace discharging roller way and is used for detecting the time point acquisition of the steel billet biting into the No. 1 main motor;

the furnace discharging roller way control unit consists of a roller way and a roller way frequency converter and is used for controlling the automatic operation of the roller way, so that the roller way operates when the roller way is operated and does not operate when no action signal exists;

and the HMI operation unit is used for parameter display and adjustment.

Further, the heating furnace PLC control unit is Siemens S7-400 PLC.

Furthermore, the signal of the main motor encoder is divided into two paths, one path is used for main transmission speed control, and the other path is led to a Siemens FM450 high-speed counting module for pulse counting.

Furthermore, the hot metal detector has three sets, one set is arranged at the mouth of the heating furnace door, and the other two sets are arranged above the discharging roller way.

The control method of the automatic control system for accurate tapping of the heating furnace comprises the following steps:

1) starting from the internal action of the heating furnace, when the last blank is rotated and conveyed out of the furnace door from the heating furnace through the discharging cantilever roller way, the hot metal detector at the furnace door opening can detect that the blank completely leaves the furnace, and the walking beam automatically and positively circulates, and the blank is parked on the discharging cantilever roller way to wait for a signal command for allowing the supply of the blank;

2) the blank from the heating furnace is conveyed to a discharging roller way, the blank can generate signal output when passing through a hot metal detector on the discharging roller way, and the output signal disappears when the blank leaves the hot metal detector;

3) the distance between a hot metal detector for detecting the blank and the central line of the rolling mill No. 1 is fixed, the hot metal detector transmits a signal to a heating furnace PLC control unit when detecting the tail part of the blank, then the heating furnace PLC control unit calculates the time when the tail part of the blank passes through a main rolling mill according to the speed of a discharging roller way and the linear speed of the rolling mill, converts the number of pulses of an encoder arranged on a main motor according to the time and the current speed, sends a signal for allowing steel tapping when the calculated number of pulses is consistent with the actually acquired number of pulses of the encoder of the main motor, and waits for the blank on a discharging cantilever roller way to move to the discharging roller way through the operation of the discharging roller way and reach the position of the main rolling mill to start rolling. If the steel tapping rhythm is changed due to the change of rolling specifications, the steel tapping time can be adjusted through an adjusting window on a WINCC control picture of the HMI operation unit.

The control system realizes unmanned operation and can automatically run only by setting parameters on a control computer picture.

The specific control program is as follows:

1) after the last blank is bitten into the No. 1 main rolling mill for 2 seconds on the discharging roller way, the middle interlocking signal M40.6 of a billet biting signal is set (a delay on-time relay and a delay off-time relay are added to prevent the input signal from being flashed).

2) When the last billet is bitten by the No. 1 main rolling mill on the discharging roller way, the middle interlocking signal M41.7 'billet biting signal confirmation' is set.

3) When the automatic transfer switch on the operation panel is operated, the middle interlocking signal M41.6 is set in the automatic tapping mode.

4) After the No. 1 main rolling mill bites the billet, the current starts to rise, and the bite detection is performed, the hot metal detector detects that the billet has bitten into the No. 1 main rolling mill, and meanwhile, the numerical value fed back by the No. 1 main rolling mill encoder is stored in the data MD160 "No. 1 main motor pulse when the billet bites" (data type: a double integer).

5) The value in MD160 is subtracted from the value fed back by the main mill encoder # 1, and the resulting data is stored in # temp 9. And converts the data type of # temp9 from a double integer to a floating point number and stores it in # temp 10.

6) The real number 4000 is divided by the value in "actual speed of main rolling mill No. 1" in MD116, and the resulting result is stored in "calculated speed of rolling mill No. 1" in MD 112.

7) The data set MD88 is multiplied by 5000 to generate a result, the result is stored in the data set MD92, M70.5 is set when the value in # temp10 is larger than that in MD92, and if the blank is just bitten by No. 1 main motor, the blank waiting in the heating furnace is driven by the cantilever roller way to come out of the furnace and moves on the furnace-out roller way towards No. 1 main rolling mill.

8) According to the 'walking beam start delay setting' time set on the picture, after the previous blank leaves the furnace, timing is started, and after the time is up, the walking beam automatically acts to place the blank on the cantilever roller way in the furnace.

9) On the computer operation picture, the tapping rhythm can be finely adjusted by setting the numerical value of 'rolling mill calculation'. The time of the delayed action of the walking beam after the last blank leaves the heating furnace can be adjusted by adjusting the 'start delay setting of the walking beam'. The time for starting the cantilever roller way in a delayed mode after the tapping signal arrives can be adjusted by adjusting the starting time of the cantilever roller way.

The actual interval between each blank and the previous blank can be displayed through the window 'head-tail interval(s)', and data acquisition and recording are realized.

The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.

The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.