KR960007781B1 - Automatic system of estimating a poor plating using a speed control - Google Patents

Abstract

This system consists of resolver(20) equipped at the motor for roller(14) driving for production of voltage in proportion to speed of motor revolution, AD convertor(31) for converting voltage output of resolver(20) into digital signal, process unit(32) for converting digital value of AD convertor(31) into transfer velocity of material in furnace, output buffer(34) for temporary storing of process unit(32), PLC(30) containing communication port(35) for transmitting serial data to process computer(40), interrupted CPU(46) by input data of PLC(30) pass communication port(41) and input buffer(42), DMA(43) for transmitting control the position and total length data of poor coating calculated at CPU(46) to CRT output buffer(43). The automatic system with process computer(4) is achieved by the processes of (a) production of low speed starting and low speed finishing flag according to the speed found under or over the specified operating speed, (b) calculating and storing of the start and the finish positions of poor coating part, (c) recalculating of real distance from roller to cutter, and (d) executing of alarm and on-and-off indicating display.

Description

Automatic plating failure judgment system using furnace operation speed

1 is a block diagram of a plating failure automatic determination system according to the present invention.

2 is an internal execution flow diagram of the process computer of the present invention.

* Explanation of symbols for main parts of the drawings

10: plating factory, 11: payoff reel,

12: welding machine, 13: furnace,

14 roller, 15 plating port,

16: cutter, 17 tension reel,

18: CRT, 20: resolver,

30: PLC (Programmable Logic Controller),

31: AD converter, 32: process unit,

33: memo paper, 34: output buffer,

35: communication port, 40: process computer,

41: communication port, 42: input buffer,

43: DMA (Direct Memory Access),

44: system buffer, 45: communication port,

46: CPU, 47: Memory,

48: CRT specific output butter.

The present invention is to determine whether the occurrence of plating defects and the location of the plating defects on the screen automatically by using the operating speed of the furnace in the production process of steel cold-rolled plating products to display and track on the screen to improve the product inspection efficiency and product quality of the inspector The present invention relates to a plating failure automatic determination system using a furnace operation speed.

The quality of the cold rolled plated product is greatly influenced by the operating speed and heating temperature of the furnace. However, the quality of the plated product is almost determined by the operating speed considering the characteristics of the furnace which cannot be easily changed.

Sudden equipment trouble, unstable operation of the operator, or other unforeseen circumstances during operation may inevitably reduce the operating speed of the equipment or stop the operation. However, due to the characteristics, the plate in the furnace (strip temperature) becomes relatively high, resulting in poor plating adhesion during plating work at the plating port, resulting in plating peeling, which causes poor plating quality. Less than (moving speed per minute), which is a value obtained by operating rules.

Until now, it was difficult for the inspector to inspect the product because it was difficult to pinpoint the plating defect part by relying on the naked eye of the inspector only to judge the plating defect part due to the change of furnace operation speed, and the inspector missed the inspection point depending on the site situation. There was a problem that the product quality is reduced.

The present invention focuses on causing plating failure when the furnace operation speed is less than 30MPM, and after receiving and determining the furnace operation speed information of a certain period generated in real time from a sub-system from the process computer, it is determined that plating failure occurs. In this case, the location of the defective plating part is displayed on the operation guide screen and tracked at the same time, so that accurate inspection by the inspector can be performed, thereby improving the product inspection efficiency. It aims to prevent product quality deterioration.

Hereinafter, the present invention will be described based on the accompanying drawings.

1 is a block diagram of the present invention, in which a resolver 20 is provided in a motor (not shown) for driving the roller 14 of the furnace 13, and a voltage signal obtained by the resolver 20 is transmitted to the PLC 30. As shown in FIG. Configured to be input, the voltage-speed conversion data output processed by the PLC 30 is configured to be input to a process computer 40, and the data processed by the process computer 40 includes the furnace 13. It is configured to be displayed and output to the laboratory CRT 18 in the plating factory 10.

The plating factory 10 and the furnace 13 including a welding machine 12 for welding the material released from the pay-off reel 11 for the continuous process, and a motor for driving the material conveying roller 14 and A plating port 15 containing a plating solution for plating the material heated in the furnace 13, and a exit cutter 16 and a tension reel 17 cutting the material having passed through the plating port 15 to a predetermined length. ).

The resolver 20 is a kind of synchro transmitter and outputs the rotational speed of the roller 14 driving motor as a voltage value.

The PLC 30 applies the AD converter 31 for converting the voltage output signal of the resolver 20 into a digital signal, and applies the output voltage digital value of the AD converter 31 to a table stored in the memory 33 for speed. A process unit 32 for calculating and outputting a value, an output buffer 34 for temporarily storing the output data of the process unit 32, and temporary storage data of the output buffer 34 at a predetermined time interval for processing And a communication port 35 for transmitting data to the computer 40.

The process computer 40 receives the transmission data from the PLC 30, temporarily stores and outputs the communication port 41 and the input buffer 42, and receives the output data of the input buffer 42 and receives a system buffer ( 44 to the CPU 46 via the communication port 45, and receive the command and data of the CPU 46 having the memory 47 via the communication port 45 and the system buffer 44. DMA 43 and a CRT designated output buffer 48 for selectively controlling the output of the DMA 43 to the monitor 18 of each plating factory.

Referring to the operation of the present invention configured as described above are as follows.

In FIG. 1, the field equipment driving of the plating factory 10 is made by the rotation of the roller 14, and the roller 14 is driven by the motor (not shown).

The resolver 20 is installed in the motor to generate a voltage proportional to the rotational speed of the motor, and this voltage signal is provided to the PLC 30.

Accordingly, the PLC 30 converts the output voltage value of the resolver, which is an analog value, into digital data capable of internal arithmetic processing by the processor, in the AD converter 31, and the digital data is input to the process unit 32. Reference numeral 32 retrieves the speed information corresponding to the corresponding voltage value of the input digital data from the table memory 33 and stores it in the output buffer 34 which is a temporary storage memory inside the process unit 32. The data stored in the output buffer 34 is edited as the furnace speed data by the transmission processing operation of the communication port 35 and transmitted to the process computer 40. At this time, the transmission processing operation of the communication port 34 is 10, for example. It continues to run at fixed intervals to perform speed data editing and transmission.

When the process computer 40 receives the speed data transmitted from the PLC 40 to the communication port 41 and the input buffer 42 and performs processing, the CPU 46 interrupt is generated in the DMA 43. 46 receives data of the DMA 43 via the system buffer 44 and the communication port 45.

At this time, the velocity data is stored in the system buffer 44.

Accordingly, the CPU 46 stores the output information by the screen surface treatment in the system buffer 44 at regular intervals (10 seconds) according to the speed data collection and plating failure part determination processing program, and then the DMA 43 and the CRT. The output is sent to the laboratory CRT 18 of the plating factory via the designated output buffer 48.

2 is a flowchart of the speed data collection in the CPU 46 in the process computer 40 and the plating failure determination processing program accordingly.

When receiving the no operation speed digital data from the PLC 30, which is a sub-system, first check whether the speed received in step 201 is a range (less than 30 MPM) that causes plating failure, and then refer to the contents of the low speed flag to perform plating failure. It determines whether or not it occurs and stores the related information in the speed information collection table memory.

If the speed is less than 30 MPM, it is determined in step 202 whether the low speed start flag is on. If the low speed start flag is ON, the low speed operation has already occurred, so the flow proceeds to step 206 and the low speed start flag is turned off. Since the low speed operation that causes the plating failure is started from now on, the flow proceeds to step 203 to set the low speed start flag to on, and stores the current furnace operation speed in the memory 47 in step 204. Subsequently, in step 205, the plating failure start position is calculated and stored in the memory 47, which is the distance from the tension reel 17 to the roller 14 at which the furnace operation speed is generated. In step 206, the head position is recalculated from the head position stored in the memory 47.

On the other hand, if the speed is 30 MPM or more, it is determined in step 207 whether the low speed start flag is on. If the low speed start flag is off, the low speed operation has not occurred. Therefore, the flow proceeds to step 211. Since the low speed operation ends and normal operation starts, if the low speed start flag is on, proceed to step 208 to set the low speed end flag to on, and store the current furnace operation speed in the memory 47 in step 209. In step 210, the end position of the plating failure generation is calculated and stored in the memory 47 by calculating the distance from the tension reel 17 to the roller 14. In step 211, the head position is recalculated from the end position of the plating failure occurrence stored in the memory 47.

Through this process, one plating defective portion range is determined as the low speed start flag and the low speed end flag.

Subsequently, a process of displaying and tracking the position of the plating failure part on the screen is performed by using the data of the speed data collection table stored by the speed data collection and plating failure determination process.

Whether or not the plating failure is generated is determined using the low speed start and end flags of the Songdo data collection table. If the low speed start flag is turned on, the lead position of the defective plating portion is read from the table and then recalculated to the length from the tapping cutting machine 16 and displayed on the laboratory CRT 18. If necessary, the surveyor is to make it easier to recognize the location of the defective part.

The recalculation of the plating defect head position performed in step 206 is performed to obtain the actual length from the roller 14 to the cutter 16 at the length from the tension reel 17 to the roller 14, which was calculated and stored earlier. , By reducing the distance from the tension reel 17 to the cutter 16.

Similarly, when the low end flag is turned on, the plating defective part end position is read from the table, recalculated to the length from the exiting cutter 16, and displayed on the screen of the laboratory CRT 18. The defect length is also calculated and displayed on the screen, and this plating defect part data is tracked and displayed in real time according to the flow of the work material.

On the other hand, it is determined in step 213 whether the leading position of the poor plating part is located within 30M from the exit cutter, and if the position is within 30M (which may vary depending on the plant operating speed characteristics of the plant), a warning bell sounds in step 214. Generate a beep. In step 215, the spot is flickered to prevent inspection points from being missed with audible and visual effects, even if the laboratory operator is not looking at the screen, ensuring complete inspection of the product, improving inspection efficiency and plating product quality. It becomes possible.

As described above, the present invention uses the furnace operation speed transmitted in real time from the lower PLC system to automatically determine the location of the plating failure part on the process computer and display it on the screen, and to inspect the movement of the corresponding location in real time. The unique effect of eliminating inefficiency in this long-term visual judgment and accurately indicating the location of plating defects, thereby cutting the defective parts or performing a more accurate product inspection, resulting in improved inspection efficiency and improved plating product quality. Will appear.

Claims (1)

A resolver 20 installed in the motor for driving the roller 14 to generate a voltage proportional to the rotation speed of the motor; An AD converter 31 for converting the voltage output of the resolver 20 into a digital signal, a process unit 32 for converting the digital value of the AD converter 31 to a material traveling speed in the furnace, and the process unit 32 PLC including an output buffer 34 for temporarily storing the speed data of the control panel and a communication port 35 for transmitting the series of data to the process computer 40 while activating the output buffer 34 at a predetermined time interval. 30; The transfer data of the PLC 30 is input through the communication port 41 and the input buffer 42 to interrupt the CPU 46, and the CRT designation of the defective part position and the total length data processed by the CPU 46 is performed. And a DMA 43 for controlling transmission to the output buffer 48, wherein the CPU 46 calculates the start and end positions of the defective part by generating a low speed start and a low speed end flag according to the check of the operation speed below and no abnormality. And a process computer 40 for storing and then recalculating the actual distance from the roller to the cutter, and executing an alarm and a display when the tip of the defective part is within a certain distance from the cutter. Automatic plating judgment system using speed.