SU1333435A1 - Control system for subsequent displacement of piece blanks in profile-iron bending mill - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to control systems for the drive of a profiligene mill. The aim of the invention is to improve performance and reliability. In the inter-cage space of a roll-forming mill (PS), sensors (D) are installed that are triggered when a piece billet (SH) passes in the areas of their sensitivity. The control is carried out with the help of signals D, indicating the absence or presence of SS in the PS zones they control. At simultaneous switching on of neighboring: D from different ShZ, from which the first ShZ is incident, and the second is inhibited, the PS drive is disconnected. With the passage of one SZ of two D, the PS drive does not switch off due to the fact that each incident SC includes M, which form two signals each. One of the signals is fed to the control element, standing first, and the other, bounded by the time delay element, to the control element next to it in the course of the movement of the SS. Signals from D without a time delay are held until the SS affects D, and signals limited by time enter the control element for a short time. Using these short-term signals in each control element, a rampant free-field shock is polled over the front of the D, the prohibition of the alarm of the control element to the output device when a single shock signal is applied to two adjacent D. 1 Il. a (L with SA: Od with 4 co

Description

The invention relates to the processing of metals by pressure, in particular to bending mills, and can be used to continuously monitor the passage of piece strip blanks, one after the other in profile bending mills or machines of similar purpose.

The purpose of the invention is to increase productivity and reliability.

The drawing schematically shows a profile mill with elements of a control system,

The profile mill consists of stands 1, mounted on frame 2, which includes work rolls (upper 3 and lower 4) transporting and processing piece pieces 5,6 and 7.

In the bending mill, the control of the free gap between the piece blanks 5, 6 and 7 is carried out using a monitoring system, which includes sensors 8, installed along the logging movement, time delaying elements 9, control elements 10 and output device 11.

The system works as follows.

From the clamping workpiece 5, which is included in the prfibibochny clamp 5, the sensor D1 is triggered and sends a signal to the control element EK1 (logical element I) about the presence of the workpiece sensor. At the same time, from the sensor D2, the control element EC1 receives a signal about the absence of a blank above them. ° Thus, the input billet 5 with the help of the D1 sensor activated by it interrogates about the presence of a free D2 sensor on the course, not included by the blank billet 6. Since the control element EK1 from the D1 sensor receives a signal about the presence of the workpiece above it, and D2 is a signal about the absence of a workpiece above it, the control element EC1 does not give a signal to the output device WU to disconnect the drive of the roll forming mill, which indicates the presence of a gap between piece blanks 5 and 6 and permission to move the workpiece 5 until the sensor D is turned on 2

In the course of its movement, the blank 5 includes a sensor D2, which gives a signal that there is a blank above it in the control element EK1. However by this time using the time delay element

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BB1 stops the signal of the presence of the workpiece above the D1 sensor and in the control element there will be only a signal of the presence of the workpiece above the D2 sensor, therefore the control element EK1 again does not send a signal to the output device WU to stop the drive of the profile bending mill. The workpiece 6 normally passes along the route from the cage to the cage with a given speed of movement and simultaneously switches on the DZ and D4 sensors, however, the EKZ control element does not issue a signal to the output device VU to turn off the drive of the roll forming mill, because the signal from the DZ sensor limited by the shutter element time of VVZ, ceases earlier than the signal appears, unlimited by the delay of time from sensor D4.

The situation is similar with the control element EC5, where the workpiece 7 simultaneously includes two sensors D5 and D6, but the signal from sensor D5 to the element control EC5 is limited by the BB5 time delay element and the control element EC5 receives only the signal from the sensor DB, therefore the control element EK5 does not provide a signal to turn off the drive of the roll forming mill.

In this case, all time delay elements 9 that limit the signals of the transducers must turn off these signals before the oncoming workpiece reaches the front-facing sensor, and hold them in the off state until the sensor goes off.

During normal passage of the workpiece 7 along the path of movement, the free gap between the piece workpieces 6 and 7 is kept constant, and one or more sensors that are not included in the workpiece are also constantly kept in this distance g.

During the deceleration of the workpieces 7, the sensor D5 remains on, the signal of which is fed to the control element EC4, and the incident workpiece 6 turns on the sensor D4, the signal generated from it is also fed to the control element EC4. In the case when signals from sensors D4 and D5 simultaneously enter the control unit EK4, the control element transmits a signal to the output device of the control unit, which gives the command to turn off the drive of the roll-forming mill.

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Thus, each piece of a change from the sensor, standing behind, with

cooking, foray into the zone, the purpose of preventing the inclusion of this sensor

the next sensor, causes a banding, and the second signal

its activation (triggering) is re-limited by the time lag, as a result of which the sensor is formed into a control element having

the signal of the presence of the workpiece over the same number with the sensor (using a sensor that is supplied in accordance with the measure- ment), and serves as a constituent control element, where it is not a polled pulse, during

compared with the signal given by the control elements realized in front of the standing sensor. In this case, the control of the free gap

the signal from the first along the movement between the workpieces, as well as the preventer sensor is limited by the element of the output signal to turn off

hold time so that it is cut off from the mill

Tils earlier than the piece blank one, the workpiece of several sensors,

will have time to reach the front of the standing date-signal of the last sensor dn without

time limit is applied If during this time it is time to the last control element and

control element from the sensor, serves only to prohibit the activation

included oncoming workpiece, 2o of the last but one sensor incident

a signal comes about the presence of the workpiece, the workpiece.

a-OT in front of the sensor comes

Experimental testing of the control system — a signal for the absence of a workpiece, then the cell will not give a signal to the output through the successive passage of the control unit - “„ piece blanks, delivered one

The device is a VU which does not give 25.

 one after another, it was carried out with the profiles of the command to turn off the drive for the prophylaxis of parts from piece blanks of the bending mill .- .- ,,, „„,

. If during this exposure time J795 mm, width 234 mm, from the front of the sensor in thickness of 1, 2 mm from metal sheet galvanized control element, a signal will appear on the presence of B-1.2 GOST 19904-74 billet, which means a sharp bath --- focf T49T8-80 reduction of the free gap between -. With a piece of billet, while the element is not 0.5-3x50-300 heavy type 50-421 control, it will give a signal to the output device- 00 with a speed of profiling (V), which will give a command to 30 m / min. Inner spacing for the 750 mm roll-bending drive. The specified mill interval is 1000 mm. Distance between sensors

During normal operation, the profile is 750 mm. Constantly one sensor of the rest of the mill. The free intervals of the vals during normal operation of the mill in between two adjacent workpieces, the Q field of the gap between the piece pieces is expected by the feeding device in large quantities. - with - the distance between the sensors and the juice - At the entrance to the cage, permanent wounds were set to exit from as contactless sensors;

 front end switches; BTP 101 type detectors The control system monitors g 2443. In order to receive signals from the dates, the gaps between the unit lugs to the load of each sensor were not reduced by adjustments to the distance of the relay type RPU-0- 911U4 on; less distance between sensors. 24 VDC.

Feature of the control system. As elements of time delays, the signals from the sensors -Q menyi used time relays of type, to the elements of control. VL-43UHP4 at 24 VDC from D1 chime gives a signal limited by a shutter speed interval of 0.1-1 s. The time delay BB1 to the control element. As an output device, roll EK1, from the second sensor D2 and. The relays RPU-0-911U4 subsequent to D (p-1) were also used, with the exception of 24 V dc gg, which are connected to the control elements, a signal, one of which is connected without parallel At this time, the control element is supplied, each control element consisted of where a signal is supplied with a voltage of series-connected contacts, from KOTOpbix one was a closing contact of a relay activated by a sensor triggered by an incident strip, the second is a closing contact of a relay at The switch is connected by the front sensor, and the third is by the disconnecting contact of the time switch that is activated by the first sensor.

The tests confirmed the possibility of controlling the free gap between the piece blanks, continuously delivered one after the other, while shutting off the drive of the roll forming mill with the opening contact of the output device occurred only when the adjacent sensors were switched on by the oncoming and artificially hindered blanks.

The use of this control system ensures the elimination of full-fledged billets delivered to the profiligene mill one by one, which increases the productivity of the roll forming mill, and the cost of repairing the stands is also reduced. In addition, the lack of crawling blanks one to another reduces losses

profiled m-material from technology defect.

Using the proposed method of continuous control of piece blanks increases the reliability and stability of the operation of automatic profiling lines, reduces downtime due to breakdowns and makes it possible to increase their productivity by 10–20%,

Claims (1)

Invention Formula Follower control system movement of piece blanks in A bending mill consisting of a series of sequentially installed stands, comprising sensors associated with a mill drive disconnect device, characterized in that, in order to improve performance and reliability, it is equipped with logical elements of type I and a time relay, sensors are installed in front of and behind each cage and are connected to the inputs of the type I logical element, while the rear sensors are connected to these inputs via a time relay, and the outputs of the type I logic elements are connected to the mill drive disconnecting device. Editor M.Petrova Compiled by S. Shibanov Tehred M. Khodanich Proofreader A.Zimokosov Order 3903 / 10Tire: Y-730 Subscription VNSHPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4