阅读说明：本技术 一种防止热轧换辊小车电缆拉断的控制装置和方法 (Control device and method for preventing hot-rolling roll changing trolley cable from being broken ) 是由 李宁 夏焕梅 李增军 王艳东 王亮超 苗新江 李娜 于 2019-10-31 设计创作，主要内容包括：一种防止热轧换辊小车电缆拉断的控制装置和方法,属于热轧轧机设备及方法技术领域,用于防止换辊小车动力电缆被拉断。其技术方案是：本发明的接近开关安装电缆卷筒两侧,接近开关可对换辊小车运行过程中电缆卷筒转动情况进行监控,接近开关将监测信号输送到可编程序控制器(PLC)中,可编程序控制器(PLC)对电缆卷筒的转动情况进行判断,在监控信号显示电缆卷筒停止转动时及时发出停止换辊小车运行的指令,防止因卷筒机械卡阻而造成小车动力电缆被拉断的现象发生。本发明设计思路巧妙,控制过程简单,是热轧控制技术的首创,填补了防止换辊小车动力电缆拉断控制技术领域的空白,完全杜绝了换辊小车电缆拉断事故,大大提高了生产效率。(A control device and a method for preventing a hot rolling roll changing trolley cable from being broken belong to the technical field of hot rolling mill equipment and methods, and are used for preventing a roll changing trolley power cable from being broken. The technical scheme is as follows: the proximity switch is arranged on two sides of the cable drum, the proximity switch can monitor the rotation condition of the cable drum in the operation process of the roll changing trolley, the proximity switch transmits a monitoring signal to the Programmable Logic Controller (PLC), the PLC judges the rotation condition of the cable drum, and when the monitoring signal shows that the cable drum stops rotating, an instruction for stopping the operation of the roll changing trolley is sent out in time, so that the phenomenon that the power cable of the trolley is broken due to the mechanical jamming of the drum is prevented. The invention has the advantages of ingenious design idea and simple control process, is the initiative of the hot rolling control technology, fills the blank of the technical field of the control for preventing the roll changing trolley from being broken by the power cable, completely eradicates the cable breakage accident of the roll changing trolley and greatly improves the production efficiency.)

1. The utility model provides a prevent that hot rolling roll change dolly cable from breaking controlling means which characterized in that: the roll changing trolley comprises two proximity switches (5) and a Programmable Logic Controller (PLC), wherein the two proximity switches (5) are respectively installed on two sides of a roll changing trolley cable drum (6), the proximity switches (5) are connected with a counter module of the Programmable Logic Controller (PLC), and a signal output end of the Programmable Logic Controller (PLC) is respectively connected with a control end of a roll changing trolley driving device and an alarm.

2. The control device for preventing the cable of the hot rolling roll changing trolley from being broken as claimed in claim 1, wherein: the two proximity switches (5) are arranged at two opposite sides of the circle center of the roll changing trolley cable drum (6), and the distance between the two proximity switches (5) and the circle center of the roll changing trolley cable drum (6) is 350mm respectively.

3. A control method for preventing the hot rolling roll changing trolley from being broken by the cable pull-out by using the control device is characterized in that: the method comprises the following steps:

a. the circumference of the cable drum (6) is provided with a plurality of rotating shafts (4), the rotating shafts (4) are radially distributed by taking the center of the cable drum (6) as the circle center, the distances between the adjacent rotating shafts (4) are equal, the rotating shafts (4) continuously pass through the proximity switch (5) to trigger the proximity switch (5) in the advancing process of the roll changing trolley, and the proximity switch (5) continuously transmits a trigger signal to the signal input end of the Programmable Logic Controller (PLC);

b. in a Programmable Logic Controller (PLC), a counter module counts the times of the rotating shaft (4) detected by the proximity switch (5);

c. in the running process of the roll changing trolley, the roll changing trolley has different speeds at different stages and specific positions, and the corresponding rotating shaft (4) also has different revolutions, different delay time is set in a Programmable Logic Controller (PLC) according to the actual running speed and the specific positions of the roll changing trolley, and the different delay time corresponds to the corresponding revolutions of the rotating shaft (4);

d. the Programmable Logic Controller (PLC) monitors the detection times of the rotating shaft (4), and when the rotation times of the rotating shaft (4) and the set rotation value of the corresponding delay time are obviously reduced or are not increased any more, the Programmable Logic Controller (PLC) judges that the cable drum (6) has a mechanical jamming fault, automatically sends out a roll changing trolley stop operation command, and prevents the cable from being broken.

4. The control method for preventing the cable of the hot rolling roll changing trolley from being broken as claimed in claim 3, wherein the control method comprises the following steps: the roll changing trolley moves in two directions on a roll changing roller table (1), a high-speed running stage and a low-speed running stage are arranged in the movement in different directions, the running linear speed of a cable drum (6) is consistent with the running speed of the roll changing trolley when the roll changing trolley runs at a high speed and at a low speed, the time interval of a proximity switch (5) for detecting a rotating shaft (4) of the cable drum (6) in the high-speed running stage of the roll changing trolley is smaller than the time interval of the rotating shaft (4) of the cable drum (6) in the low-speed running stage of the roll changing trolley, and different delay times are set by a corresponding Programmable Logic Controller (PLC).

5. The control method for preventing the cable of the hot rolling roll changing trolley from being broken as claimed in claim 3, wherein the control method comprises the following steps: the roll changing trolley is characterized in that a reversing operation stage and a cable drum reversing area exist on a roll changing roller way (1), the rotating speed of a cable drum (6) changes in the reversing operation stage and the cable drum reversing area, the rotating speed interval of a rotating shaft (4) detected by a proximity switch (5) is increased, and different delay times are set by a corresponding Programmable Logic Controller (PLC).

6. The control method for preventing the hot rolling roll changing trolley from being pulled apart according to claim 4 or 5, wherein the control method comprises the following steps: and in the high-speed running stage of the roll changing trolley, the fault alarm time interval of a counter of a Programmable Logic Controller (PLC) is set to be 16 seconds, in the low-speed running stage of the roll changing trolley, the fault alarm time interval of the counter of the Programmable Logic Controller (PLC) is set to be 4 seconds, and in the cable reel changing area, the fault alarm time interval of the counter of the Programmable Logic Controller (PLC) is set to be 24 seconds.

Technical Field

The invention relates to a control device and a control method for preventing a roll changing trolley from being broken by tension in roll changing operation of a hot rolling finishing mill and a roughing mill, belonging to the technical field of hot rolling mill equipment and methods.

Background

The working rolls of the rolling mill of the hot rolling production line are abraded greatly in the high-speed rolling process, the working rolls need to be replaced after each rolling plan is finished, the working rolls are replaced more than 5 times every day, and the high-load and fast-rhythm production of the hot rolling line requires that the roll replacement process is finished efficiently, quickly and automatically, so that the reduction of the fault rate of the roll replacement trolley has great significance for the smooth production of the hot rolling production line. The faults of a roll changing system are mainly concentrated on a cable drum of a roll changing trolley since the hot rolling is put into production, the cable drum stops due to mechanical blocking in the roll changing process for many times, the roll changing trolley continues to move forwards to cause a cable breaking accident, and the cable of the roll changing trolley needs to be changed for 2 hours, so that the normal production of the hot rolling is seriously influenced, and meanwhile, the larger economic loss is caused. At present, a control technology for preventing the power cable of the roll changing trolley from being broken is lacked in a domestic and foreign hot rolling automatic control system, so that the broken power cable becomes a high-occurrence accident commonly existing in the roll changing process of a hot rolling production line, and a control device and a method for preventing the cable of the hot rolling roll changing trolley from being broken are urgently required to be developed so as to ensure the normal operation of production.

Disclosure of Invention

The invention aims to solve the technical problem of providing a control device and a control method for preventing the cable of a hot rolling roll changing trolley from being broken, which can prevent the cable breaking accident caused by the mechanical blockage of a cable drum in the advancing process of the roll changing trolley, effectively solve the technical problem of high cable breaking accident of a roll changing system of a hot rolling production line and fill up the technical blank of the hot rolling production line in the field of the control of preventing the cable from being broken of the roll changing system.

The technical scheme for solving the technical problems is as follows:

the utility model provides a prevent control device that hot rolling roll-changing dolly cable broke, it includes proximity switch, programmable controller (PLC), and two proximity switches are installed respectively in roll-changing dolly cable drum both sides, and proximity switch is connected with programmable controller (PLC)'s counter module, and programmable controller (PLC)'s signal output part is connected respectively with roll-changing dolly drive arrangement's control end and alarm.

According to the control device for preventing the hot rolling roll changing trolley cable from being broken, the installation positions of the two proximity switches are opposite to each other on the two sides of the circle center of the roll changing trolley cable drum, and the distances between the two proximity switches and the circle center of the roll changing trolley cable drum are respectively 350 mm.

A control method for preventing the hot-rolling roll-changing trolley from being broken by the cable tension by using the control device comprises the following steps:

a. the circumference of the cable drum is provided with a plurality of rotating shafts, the rotating shafts are radially distributed by taking the center of the cable drum as a circle center, the distances between the adjacent rotating shafts are equal, the rotating shafts continuously pass through the proximity switch in the advancing process of the roll changing trolley, the proximity switch is used for triggering the proximity switch, and the proximity switch continuously transmits a triggering signal to a signal input end of a Programmable Logic Controller (PLC);

b. in a Programmable Logic Controller (PLC), a counter module counts the number of times of the rotating shaft detected by the proximity switch;

c. in the running process of the roll changing trolley, the roll changing trolley has different speeds at different stages and specific positions, and the corresponding rotating shaft also has different revolutions, in a Programmable Logic Controller (PLC), different delay times are set according to the actual running speed and the specific position of the roll changing trolley, and the different delay times correspond to the corresponding revolutions of the rotating shaft;

d. the Programmable Logic Controller (PLC) monitors the detection times of the rotating shaft, and when the rotation times of the rotating shaft and the set rotation value of the corresponding delay time are obviously reduced or not increased, the Programmable Logic Controller (PLC) judges that the cable drum has a mechanical jamming fault, automatically sends out a command of stopping the operation of the roll changing trolley, and prevents the cable from being broken.

According to the control method for preventing the cable of the hot rolling roll changing trolley from being broken, the roll changing trolley moves in two directions on a roll changing roller table, a high-speed operation stage and a low-speed operation stage are arranged in the movement in different directions, the operation linear speed of the cable drum is consistent with the operation speed of the roll changing trolley when the roll changing trolley operates at high speed and at low speed, the time interval of the proximity switch for detecting the rotating shaft of the cable drum in the high-speed operation stage of the roll changing trolley is smaller than the time interval of the proximity switch for detecting the rotating shaft of the cable drum in the low-speed operation stage of the roll changing trolley, and different delay times are set by a corresponding Programmable Logic Controller (PLC).

According to the control method for preventing the cable of the hot rolling roll changing trolley from being broken, the roll changing trolley has a reversing operation stage and a cable drum reversing area on a roll changing roller table, the rotating speed of a cable drum changes in the reversing operation stage and the cable drum reversing area, the interval of the rotating speed of a rotating shaft detected by a proximity switch is increased, and different delay time is set by a corresponding Programmable Logic Controller (PLC).

According to the control method for preventing the cable of the hot-rolling roll changing trolley from being broken, the fault alarm time interval of the counter of the Programmable Logic Controller (PLC) is set to be 16 seconds in the high-speed running stage of the roll changing trolley, the fault alarm time interval of the counter of the Programmable Logic Controller (PLC) is set to be 4 seconds in the low-speed running stage of the roll changing trolley, and the fault alarm time interval of the counter of the Programmable Logic Controller (PLC) is set to be 24 seconds in the cable reel changing area.

The invention has the beneficial effects that:

the proximity switch is arranged on two sides of the cable drum, the proximity switch can effectively monitor the rotation condition of the cable drum in the operation process of the roll changing trolley, the proximity switch transmits a monitoring signal to the Programmable Logic Controller (PLC), the PLC judges the rotation condition of the cable drum, and when the monitoring signal shows that the cable drum stops rotating, an instruction for stopping the operation of the roll changing trolley is timely sent out, so that the phenomenon that the power cable of the trolley is broken due to the mechanical jamming of the drum is prevented. The invention realizes effective monitoring of the rotation state of the cable drum, and the control method has high accuracy.

The invention is the first creation of the hot rolling control technology, fills the blank of the technical field of the control for preventing the roll changing trolley from being broken by the power cable, and effectively solves the technical problem of high failure rate of the cable breakage of the roll changing system of the hot rolling production line. The invention has the advantages of ingenious design idea, simple control process and easy implementation, has better effect proved by the practice of hot rolling line in nearly two years, completely avoids the cable breaking accident of the roll changing trolley, greatly improves the production efficiency and has higher popularization value in the same type of production line.

Drawings

FIG. 1 is a schematic structural diagram of a control device for preventing a hot-rolling roll-changing trolley from being broken by a cable;

FIG. 2 is a schematic view of the roller changing trolley in a roller way walking state.

The figures are labeled as follows: roll changing roller way 1, roller way gear 2, rotating pulley 3, reel rotating shaft 4, proximity switch 5, cable reel 6 and trolley power cable 7.

Detailed Description

The control device for preventing the hot rolling roll changing trolley from being broken by the cable comprises a proximity switch 5 and a Programmable Logic Controller (PLC).

Fig. 1 shows that two proximity switches 5 are respectively installed on two sides of a cable drum 6 of the roll changing trolley, the proximity switches 5 are connected with a counter module of a Programmable Logic Controller (PLC), and a signal output end of the PLC is respectively connected with a control end of a driving device of the roll changing trolley and an alarm.

Fig. 1 shows that the two proximity switches 5 are installed at two opposite sides of the center of circle of the cable drum 6 of the roll changing trolley, and the distance between the two proximity switches 5 and the center of circle of the cable drum 6 of the roll changing trolley is 350mm respectively.

The invention installs the proximity switch 5 on the cable drum 6 baffle of the roll changing trolley, the two sides of the cable drum 6 are respectively installed with one, the rotation condition of the cable drum 6 of the roll changing trolley is detected, the times of detecting the rotating shaft 4 of the cable drum 6 by the proximity switch 5 in each scanning period of the Programmable Logic Controller (PLC) are accumulated, when the output result of the accumulator CTU in a certain scanning period is equal to the output result before the specific time, namely the proximity switch 5 can not continuously detect the rotating shaft 4, the Programmable Logic Controller (PLC) judges that the cable drum 6 has mechanical jamming fault, a roll changing trolley fault signal is automatically sent to a roll changing control system, the roll changing trolley stops running, and the phenomenon that the trolley power cable 7 is pulled off due to the mechanical jamming of the drum is prevented.

The proximity switch 5 of one embodiment of the invention is arranged on a baffle plate 350mm away from the circle center of a cable drum 6, 12 rotating shafts 4 are arranged on the cable drum 6, the angle between the two rotating shafts 4 is 30 degrees, the proximity switch 5 detects the 12 rotating shafts 4 in the running process of the trolley, the counter adds 1 to the output result every time the proximity switch 5 detects the rotating shaft 4, and a Programmable Logic Controller (PLC) scans the output result in each scanning period.

Fig. 2 is a schematic view of the roller changing trolley in a running state on the roller changing roller table 1.

In the running process, the roll changing roller table 1 is divided into 13 position points of E1-E13, the speed and the running direction of the roll changing trolley are changed at different positions, and a Programmable Logic Controller (PLC) controls the rolling mill to perform corresponding actions. When the roll changing trolley runs forwards in the range of E6-E8, the roll changing trolley firstly runs to the E8 position, the lifting trolley hook is separated from a new working roll and then runs backwards to the E6 position, the transverse moving platform transversely moves towards the rough rolling direction, the roll changing trolley runs forwards to a finishing mill extraction working roll under the condition that no new working roll exists, and the running direction is switched in the range of E6-E8 in the process. When the roller changing trolley runs towards the direction of the initial position E1, the running direction is also switched between E6-E8. Three position control points are arranged at the whole running process of the roll changing trolley, namely E4, E9 and E10, the roll changing trolley is changed from high speed to low speed to run at the position, and the running speed is changed at the position. The high-speed operation is 0.4m/s, and the low-speed operation is 0.08 m/s.

Fig. 2 shows that the roller changing trolley runs on the roller changing roller table 1 as follows:

firstly, in the running process of the roll changing trolley, the running linear speed of the cable drum 6 is matched with the running speed of the roll changing trolley, and according to an angular speed and linear speed formula: v = wr and the radius of the circumference where the outer ring and the inner ring of the cable are positioned can calculate the rotation angular velocity of the cable drum 6 in real time; the cable drum 6 is wound on the cable drum 6 from the initial position E1 to the position 17000mm away from the E1 position on the roll changing roller table 1 from the roll changing roller table 3 along with the running of the roll changing trolley in the clockwise direction from the inner diameter of the cable drum 6, and the cable is laid in the cable groove of the roll changing roller table 3 from the position 17000mm to the position 30823mm away from the end position of the roll changing roller table 1 in the anticlockwise direction from the outer diameter of the cable drum 3. In the process, the running linear speed of the cable drum 6 is consistent with that of the roll changing trolley, and the angular speed of the cable drum changes in real time due to the change of the cable roll diameter: the high-speed running speed of the roll changing trolley is 0.4m/s, the low-speed running speed of the roll changing trolley is 0.08m/s, the inner diameter of the cable drum 6 is 630mm, and the outer diameter of the cable drum is 1400mm, so that the proximity switch 6 detects the primary rotating shaft 4 in 0.4-0.9 seconds when the roll changing trolley runs at the high speed, and detects the primary rotating shaft 4 in 2-4.5 seconds when the roll changing trolley runs at the low speed. When the trolley runs at a high speed, the fault alarm time interval of a counter of a Programmable Logic Controller (PLC) is set to be 16 seconds, and the fault alarm time when the trolley runs at a low speed is 4 seconds.

Secondly, the roll changing trolley has two special positions in the running process, the first position is E6-E8 of the roll changing roller table 1, when the roll changing trolley pushes a new working roll forward into a finishing mill, the roll changing trolley firstly runs to the E8 of the roll changing roller table 1, and runs backwards to the E6 after the roll changing trolley unhooks and lifts off the working roll at the position. In the process, the running direction of the roll changing trolley is changed, at the moment, the Programmable Logic Controller (PLC) detects one rotating shaft 4, the next rotating shaft 4 is about to rotate to the detection position of the proximity switch 5 in the next scanning period of the Programmable Logic Controller (PLC), but the rotating direction of the cable drum 6 is changed from clockwise to anticlockwise, under the condition, the angle of the rotating shaft 4 detected by the proximity switch 5 once is changed from 30 degrees to 60 degrees, the detection period is prolonged by one time, and at the moment, the fault scanning time needs to be designed independently. The automatic control system is added with the functions of reversing judgment and fault alarm delay control of E6 and E8 trolleys.

The other special position is a cable reel winding direction changing position which is located at 17000mm of the roller changing roller way 1, in the area of 0-17000mm of the roller changing roller way 1, the cable reel 6 rotates clockwise from the initial position E0 of the roller changing roller way 1, the cable is wound on the cable reel 6 from the cable groove of the roller changing roller way 1, when the cable runs to the 17000mm position, the cable is completely wound on the cable reel 6, in the area of 17000 + 30823mm, the cable reel 6 rotates anticlockwise, and the cable is flatly laid in the cable groove along with the running of the roller changing trolley, so that the 17000mm position is the cable reel 6 rotation direction changing position, and in the position, the problem that the detection time of the two rotating shafts 4 is prolonged is also existed. In a cable reel change direction area, the failure alarm time is set to be 24 seconds, and the reset control function of the counter is designed, so that the problem that the counting value reaches the upper counting limit and is not accumulated any more, and the production false alarm of the system is avoided.

And finally, after receiving the fault alarm signal of the cable drum 6, the Programmable Logic Controller (PLC) sends a fault signal of the roll changing trolley to the roll changing control system, and the roll changing trolley stops running, so that the phenomenon that the power cable 7 of the trolley is broken due to mechanical jamming of the drum is prevented.

In the invention, the counting range of a Programmable Logic Controller (PLC) counter CTU is 0-37273, in order to prevent the counting value from reaching the maximum value 37273 in the roll changing process, and the detection value is not accumulated any more to cause false alarm, the method of the invention has the function of resetting the counting value in time, the closed point of the running signal of the frame roll changing trolley is applied, namely the trolley stops running, the system automatically assigns 0 to the counting value, and the CTU restarts counting from 0, thereby effectively shielding the false alarm caused by the counter reaching the upper limit set value.

The invention effectively prevents the accident that the power cable 7 of the trolley is broken due to the non-rotation of the cable drum 6 by detecting the actual rotation condition of the rotating shaft 4 and setting different control methods for different speeds and different positions of the roller-changing trolley, and simultaneously effectively shields the occurrence of false alarm of the system. The method has the advantages that good application effect is achieved through practice in a hot rolling plant for more than two years, the method is stable in control, the failure rate of the roll changing trolley is obviously reduced, the daily operation rate of a production line is improved, and the cost of spare parts such as cables is further reduced; the method fills the technical blank of the roll changing trolley in the field of preventing the power cable from being pulled apart, and has higher popularization value in the same type of production line.