KR20010054881A - An apparatus for driving a car which used exchanging a rolling roll - Google Patents

Abstract

PURPOSE: An apparatus for driving a transfer car for replacing rolling rolls of a rolling mill is provided to simplify the structure of the apparatus and accurately control transfer speed and forward and backward motions of the transfer car by driving the transfer car with a cylinder so as to replace rolling rolls of the rolling mill. CONSTITUTION: The apparatus for driving a transfer car for replacing rolling rolls of a rolling mill comprises a cylinder (200-N) for moving the transfer car forward and backward; a position generator (PG) which is adhered to the cylinder so as to sense the transfer position of the transfer car by sensing a transfer distance of the cylinder; a control part (400) into which detected values showing the transfer position of the transfer car detected from the position generator (PG) are inputted so that the position of the transfer car is feedback controlled; a direction bypass solenoid valve (S) controlling the transfer direction of the transfer car as moving the cylinder forward or backward according to signals received from the control part; and a flow rate control valve (C) limiting the transfer speed of the transfer car by limiting the transfer speed of the cylinder.

Description

Balance driving device for replacing rolling rolls {An apparatus for driving a car which used exchanging a rolling roll}

The present invention relates to a bogie driving apparatus for replacing a rolling roll of a rolling mill, which simplifies the structure by driving the bogie of a bogie for replacing a rolling roll of a rolling mill by a cylinder, and the moving speed and forward and backward movement of the bogie. It relates to a rolling mill for replacing the rolling roll rolling mill that can control precisely.

1 is a view schematically showing the configuration of a trolley for replacing a rolling roll according to the prior art embodiment, the trolley 100 for replacing a four-stage type rolling roll generally used in the steel industry is an equilibrium square flat portion 130 ) And a plurality of wheels 140 mounted below the equilibrium square flat portion 130.

At this time, the four-stage rolling roll (110-1, 2 120-1, 2) is mounted on the upper portion of the flat portion 130, the clamp 150 on the side of the rolling roll bogie 100 is a hydraulic cylinder (210) Is connected to the clamp 270 at the rod end. Therefore, the rolling roll bogie 100 is configured to move at the same distance and speed as the movement distance along the forward and backward movement direction of the hydraulic cylinder 210.

In the replacement of rolling rolls, the cylinder moving section according to the working sequence is controlled by the control unit by an automated program. At this time, the position of the hydraulic cylinder 210 is continuously detected by the position generator 230 and transmitted to the controller. Then, the operation of the hydraulic cylinder 210 is controlled by the position value input from the position generator 230 to the control unit 400.

On the other hand, the position detection of the hydraulic cylinder 210 is made by a pusher bar 220, the pusher 220 is supported by the support plate 280 and the support 290. A rack gear 240 is formed on a lower bottom surface of the pusher bar 220. Therefore, by the reciprocating motion of the hydraulic cylinder 210, the pinion gear 250 engaged with the rack gear 240 is rotated, the rotational speed of the pinion gear 250 is the movement of the hydraulic cylinder 210 Converted to distance

Meanwhile, the pusher bar 220 linearly moves as much as the displacement amount of the hydraulic cylinder 210, and a pulse waveform equal to the amount of rotation of the pinion 250 engaged with the rack gear 240 is output to the controller. Then, the position generator 230 continuously sends a signal to the control unit, and determines the rolling roll replacement time based on the signal value.

As described above, the conventional roll roll replacement device requires a pusher bar 220 having the same length as the hydraulic cylinder 210, a support unit and a pinion gear 250 for supporting the same. Therefore, there is a problem that a large space is required to install such a device.

In addition, due to the deviation (backlash) generated in the mechanical coupling structure between the rack gear 240 and the pinion gear 250 connected to the pusher bar 220, the actual displacement amount and position sensor of the hydraulic cylinder 210 ( An output signal deviation between 230 is generated. For this reason, the control positions of the rolling roll bogie 100 are often different from each other, and a driving disorder is often caused by rolling roll replacement work delay.

In addition, when the impact load is acted on the hydraulic cylinder 210 and the pusher bar 220 by the rolling roll bogie and the distance interference due to the control position deviation, the bending load is applied to the pusher bar 220 and the rack gear is deformed by bending. Due to the misalignment between the 240 and the pinion gear 240, a failure occurs without power transmission, or an automatic operation is impossible due to a deviation between the actual cylinder displacement and the output signal of the detection sensor.

In order to solve the problems as described above, the present invention prevents the control position of the rolling roll bogie from being misaligned by the displacement of the actual hydraulic cylinder and the output signal deviation between the position sensor and also prevents the rolling roll replacement work delay. The displacement of hydraulic cylinder is measured by the built-in cylinder position detection sensor that is made of sensor and hydraulic cylinder to control the movement distance and moving speed of truck to replace rolling roll. It is an object of the present invention to provide a drive of a bogie for replacing a rolling roll of a rolling mill.

According to the present invention, the driving device of the rolling roll bogie for achieving the above object is a cylinder for advancing the bogie forward and backward by forward and backward, and the movement position of the bogie while being attached to the cylinder to sense the movement distance of the cylinder. A position generator for detecting a position, a controller to which a detection value indicating a movement position of the trolley detected by the position generator is input, and a moving direction of the trolley according to the forward and backward movement of the cylinder by a signal transmitted from the controller. It characterized in that it comprises a direction switching solenoid valve for controlling, and a flow control valve for limiting the moving speed of the bogie by limiting the moving speed of the cylinder.

1 is a view showing the configuration of a conventional rolling roll replacement device.

2 is a cross-sectional view showing a hydraulic cylinder structure incorporating a position detection sensor.

Figure 3 is a view showing the overall configuration of the rolling mill replacement roller rolling device according to the present invention.

<Description of Symbols for Major Parts of Drawings>

100: rolling roll bogie

100-1, 100-2: upper and lower back-up rolling rolls

120-1,100-2: upper and lower work rolling rolls

200-N: Built-in Hydraulic Cylinder

PG: Position Detection Sensor

300: hydraulic circuit

P: Hydraulic Pump

S: Directional Solenoid Valve

C: flow control valve

400: control unit

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a view showing a hydraulic cylinder according to an embodiment of the present invention, Figure 3 is a view showing the configuration of a drive device for a rolling roll replacement truck according to an embodiment of the present invention.

First, the rolling roll replacement trolley is composed of upper and lower back up rolls and upper and lower work rolls as described above, and connects the flat-shaped plant supporting them with the hydraulic cylinder to the lower portion of the flat plant to smooth the reciprocating motion. And a wheel to be mounted. In addition, the connecting portion connected to the hydraulic cylinder side rod end has an uneven structure.

At this time, the driving device of the truck according to the embodiment of the present invention is configured such that the hydraulic pressure generated in the hydraulic pump unit P for applying the fluid pressure is supplied to the hydraulic cylinder 210-N via the main pipe. Therefore, when the hydraulic cylinder 210-N reciprocates forward and backward, the rolling roll replacement bogie 100 connected to the rod end is also reciprocated forward and backward at the same time. Then, the displacement of the hydraulic cylinder 210-N is accurately detected by using the position generator PG, which is a cylinder-type position detection sensor, to the moving distance of the hydraulic cylinder 210-N, and sent to the controller 400 to replace the rolling roll. Configure to facilitate.

In order to explain the present invention, a detailed description of the configuration of the hydraulic cylinder 200-N and the rolling roll replacing apparatus 100 will be omitted.

Position detection sensor is built in the hydraulic cylinder (210-N), the driving of the hydraulic cylinder (210-N) is made by the hydraulic pressure supplied from the hydraulic pump (P). That is, the supplied hydraulic pressure is controlled via the direction switching valve S and the speed control flow control valve C, and the pressure fluid (hereinafter referred to as the control hydraulic pressure) controlled in this way is the hydraulic cylinder 210-N head. Inputs are made to the side and rod side ports. As a result, the system hydraulic circuit 300 is formed by the flow of the control hydraulic pressure.

When a specific signal is applied to one of the solenoids through the control unit 400, the direction switching valve S of the hydraulic circuit 300 is switched to switch the pressure flow path in one direction. At this time, the control hydraulic pressure is introduced into the hydraulic cylinder (210-N), the movement direction and speed of the rolling roll replacement device (l00) in accordance with the hydraulic cylinder moves the same as the movement direction and speed of the hydraulic cylinder (210-N). .

When the input signal sent from the control unit 400 to the direction switching valve S is input to the left solenoid of the direction switching valve S, the pressure fluid flow path is connected to the rod side of the hydraulic cylinder 210-N, and the cylinder head side chamber fluid. The hydraulic cylinder 210 moves to the right because it forms a flow path returned to the oil tank (T). That is, the rolling roll replacement bogie (100) to the reverse movement in the "A" direction from "B".

Similarly, when a switching signal sent from the controller 400 to the direction switching valve S is input to the right solenoid of the direction switching valve S, the pressure fluid flow path is connected to the head side of the hydraulic cylinder 210-N, and the cylinder rod side is The hydraulic cylinder 210 is made to the left by making the flow path returned to the oil tank T, and the rolling roll replacement device 100 moves forward from the "B" to the "A" direction.

At this time, the position generator PG, which is a position detection sensor, generates an electric signal equal to the actual stroke displacement of the hydraulic cylinder 210-N and continuously sends it to the control unit 400, and the control unit 400 determines the value of this signal. The location information of the rolling roll bogie 100 can be known according to the size and the change. That is, the operation of the hydraulic cylinder 210-N is controlled according to the work order determined based on this signal value.

On the other hand, the hydraulic cylinder 210-N according to the present invention has substantially the same specifications and dimensions as the hydraulic cylinder 210 of the conventional embodiment, but on the cylinder rod 12 side to embed the position detection sensor (PG) Holes of constant size in the longitudinal direction and grooves about the effective stroke length Ls of cylinder operation are machined. That is, P.G is built in the groove, and the PG senses the moving distance of the cylinder rod 12.

In addition, the cylinder head side flange 13 is configured to be able to move from side to side by the force of the fluid in the interior of the hydraulic cylinder 210-N. Therefore, the flange 13 is slid in the cylinder housing 11 to move from side to side. Then, the left and right movement distance of the flange 13 is detected by the PG and output to the control unit, the control unit 400 controls the movement distance and speed of the hydraulic cylinder 200N by the signal input from the PG pressure rolling roll The replacement will be performed.

In addition, the head side cover 14 of the hydraulic cylinder 210-N is deformed and processed so that the head part 5 and the terminal line 16 of the position detection sensor part PG are protected. On the other hand, the moving speed of the hydraulic cylinder (200-N) is made by the flow control valve (C).

The operation principle of the position generator which is a position detection sensor for implementing this invention is demonstrated below.

First, the position detection sensor part has a rod round bar. This rod round rod has the same length as the cylinder effective stroke. The linear movable iron core having electrical polarity inside the round bar is embedded in the waveguide. In addition, the linear movable iron core is configured to move left and right along the rod annular rod, and a magnet having a magnetic shape of a hole formed in the circular flat plate having an inner diameter equal to the circumferential length of the rod annular rod is fitted. Accordingly, as the magnet moves in the longitudinal direction, it is converted into an electrical signal in proportion to it and forms a head portion for amplifying the signal. It further has a connection terminal which transmits this displacement detection output signal value to an controller continuously by an electric cable.

Accordingly, the position generator PG configured as described above is integrally fastened to the hydraulic cylinder 210 -N which has been modified to facilitate internal attachment by using a screw part and a nut.

When the hydraulic cylinder 210-N using the above-mentioned control pressure fluid receives a fluid force from the hydraulic pressure surface of the flange 13 at the cylinder head side under the operating driving conditions, the flange is along the inside of the cylinder tube 11 at the cylinder rod side. Will be moved in the direction. At this time, the magnet of the position detection sensor mounted inside the flange 13 also changes the electrical resistance with the rod of the position detection sensor according to the displacement amount which is integrally integrated, and converts it into an electrical signal in the head part 5 to convert this output signal. Is sent to the controller by an electrical control cable.

Therefore, according to the present invention, by using a position generator, which is a cylinder-type position detection sensor, mounted inside the hydraulic cylinder by using a work method including a bogie drive of a four-stage rolling roll replacement device, the position displacement sensor detects the stroke displacement of the hydraulic cylinder. By directly detecting and transmitting to the controller, it minimizes the positional deviation and improves the control performance. Also, since the position detection device is integrated with the hydraulic cylinder, the installation space is reduced and the space utilization is high. Since the transmitted shock is absorbed, the possibility of deformation of the hydraulic cylinder can be minimized.

The foregoing is merely illustrative of the preferred embodiments of the present invention, and those skilled in the art to which the present invention pertains may make modifications and changes to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. .

Claims (1)

In the rolling drive replacement bogie drive device for replacing the rolling roll of the rolling mill, A cylinder for moving the cart forward and backward, A position generator attached to the cylinder for detecting a movement distance of the cylinder and detecting a movement position of the bogie; A control unit for inputting a detection value indicating a moving position of the trolley detected from the position generator to feedback-control the position of the trolley; A direction switching solenoid valve for controlling the moving direction of the bogie by moving the cylinder back and forth by a signal sent from the controller; Rolling mill balance device for rolling mill rolling rolls characterized in that it comprises a flow control valve for limiting the movement speed of the bogie by limiting the movement speed of the cylinder.