SU900907A1 - Apparatus for controlling stopless arresting of moving billets - Google Patents

Description

one

The invention relates to technical means of controlling the movement of workpieces and can be used to automate the management of the irreproachable stopping of workpieces on the roller tables before methodical heating furnaces, loading mechanisms and loading of furnaces and rolling before cutting to dimensional lengths with scissors.

A device for implementing the method of stopping motionless workpieces is known, comprising a control object, which is a workpiece and a drive for moving workpieces, setting the stop position coordinates, workpiece presence sensor, drive position sensor and computing unit, the first, second and third inputs of which are connected respectively to the transmitter, the sensor for the presence of blanks and the sensor for the position of the actuator, and the output to the actuator. In this device, the drive is preliminarily turned on when the workpiece crosses the starting position, the work path of the workpiece is measured and memorized during the drive braking until it stops, the drive is turned on. The information obtained is used to calculate the coordinate for the drive to turn off again in order to precisely stop the workpiece at a given position tl.

The drawback of the device is low (unacceptable for high-speed rolling mill aggregates) the performance of the workpiece transfer mechanism due to the preliminary stop of the drive at the initial position.

The closest to the proposed technical essence and the achieved result is a device containing a track pulse sensor, a speed sensor (tachogenerator), a setpoint for the speed setpoint, a comparing element, the first input of which is connected to the first output of the setpoint for the speed setpoint voltage. The second input is to the speed sensor, and b1 stroke is sent to the first input of the first key (element I), the second input of which is connected to the track pulse sensor, the third input to the first output of the number matching block, and the output to the first input of the braking path counter, the second input of which is connected to the information input unit, and the output to the first input of the number matching block; the second input of which is connected to the first output (which is the code output) of the movement path counter, and the second output to one of the second key inputs, the other input connected to ne The first input of the unit for setting the speed setpoint and the output to the first input of the water control unit, the first input of the motion path counter is connected to the track pulse sensor, the second input of the motion path counter is connected to the information input unit, and the second output (in the decoder output, part of the travel path counter) - to one of the inputs of the third key, the other input of which is connected to the second input of the unit of the speed setpoint voltage, and the output to the input of the drive control unit 2. The device’s disadvantage The low duality of the position of the stopped mechanism relative to the specified stop position in the case of control of the stopless moving workpieces, because the information on the actual braking area measured and stored in the current cycle of controlling the counter of the braking path is not reliable enough to form a command to start The drive was slowed down in a subsequent control cycle due to the influence on the braking path length, measured by the braking path counter, the row is uncontrollable x factors randomly changing from workpiece to workpiece, such as curvature of workpieces moving along the roller rollers, temperature of the workpieces affecting the conditions of adhesion of the workpiece to roller rollers, voltage fluctuations and supply frequency, the instability of the time of formation of electromagnetic relays drive signal control systems for stopping workpieces, weight of workpieces, etc. The goal of the Output is to increase the device's accuracy by optimizing the path of the workpiece at a reduced speed. This goal is achieved in that the control unit of the stopless motion of the moving workpiece contains a track pulse sensor, a speed sensor, a speed setpoint voltage adjuster, an information input unit, a decoder, a drive control unit that compares the first inputs of which are connected to the speed sensor, And, the first input of which is connected to the sensor of track pulses, the counter, the first input of which is connected to the information input unit, and the output is connected to the input of the decoder, the keys, the first inputs of which connected to the first and second outputs of the speed setpoint voltage selector, and the outputs are connected respectively to the first and second inputs of the drive control unit, the second input of the second switch is connected to the second output of the decoder, a trigger is added, the first and second inputs of which are connected to the outputs of the first and the second comparing elements, and the output is connected to the second input of the element And, the second inputs of the first and second comparing elements are connected respectively to the second and third To the output outputs of the voltage adjuster, speed settings, the frequency divider, the input of which is connected to the track pulse sensor, the OR element, the first and second inputs of which are connected respectively to the outputs of the frequency divider and the AND element, and the output connected to the second input of the counter, the first output of the decoder connected to the second input of the first key. FIG. 1 shows the block system of the proposed device; in fig. 2 is a velocity change chart as a function of the path of travel. The device contains a sensor 1 for traveling pulses, a setting device 2 for the speed setpoint voltage, a sensor 3 for speed, comparing elements and 5 whose first inputs are connected to the sensor 3, and the second inputs to the second and third outputs of the setting device 2, respectively, trigger 6, first and second inputs which are connected respectively to the outputs of elements 4 and 5,: and 1 cm | and 7, PS1) the second and second inputs of which are connected respectively to the sensor 1 and the output of the trigger 6, the frequency divider 8, the input of which is connected to the sensor 1, the information input block 9, the element OR 10, the first and second inputs of which are connected respectively to the divider 8 and element 7, counter 11, the first and second inputs of which are connected respectively to block 9 and element 10, the decoder 12, whose input is connected to counter 11, keys 1} and 1, the first inputs of which are connected respectively to the first and third outputs of the setting device 2, and the second inputs - respectively first and second outputs of the decoder 12 and the drive control unit 15 (e.g., the workpiece moving mechanism), the first and second inputs of which are connected to the outputs 13 and keys, respectively. The device works as follows. The counter 11, operating in the subtraction mode, preliminarily, by means of block 9, the number corresponding to the required displacement path of the next blank is recorded (section OE in FIG. 2). From the moment the billet crosses the initial position O, the first input of the element OR 10 and the second input of counter 1 1 from the output of divider 8 receive impulses of frequency g f, where f is the frequency of the pulse of sensor 1 when the billet reaches position B, the decoder 12 removes the first output signal unit, which causes the opening of the key 13 and the deceleration at -VO to a reduced speed UE (part BG current). When the workpiece passes position B due to the equality of the actual speed V and speed V, after the given output of setpoint 2, element t (amplitude comparator) is triggered, trigger 6 changes from the original steady state to another steady state, and element 7 opens . Frequency f pulses start to flow to the second input element OR 10 directly from the output of sensor 1. At the output of element OR 10 pulses of frequency f are output, because at the input of divider 8 (which is a counter with the phase representation of information), pulses are formed whose duration is equal to the duration pulse JB sensor 1, and, in addition, they coincide in phase with the pulses of sensor 1, taking into account the division factor. Then, at the moment of equality of the actual speed UV and speed V2, (Vn) set on the third output of setpoint 2, element 5 is triggered, then the position G passes the workpiece, trigger 6 returns to its original steady state, and element 7 closes,. The situation under consideration corresponds to the transition of the drive from the transport speed V. to the reduced speed Vj. 8, the moment when the velocities Vq and Vj are equal, the supply of pulses of frequency f to the second input of the element OR 10 stops, since the element 7 also is closed at the first input. It should be noted that the elements and 5 are constructed in such a way that they operate at points C and D located on the downstream part of the characteristic V (S), i.e. when braking the drive, and do not respond to the equality of the speed V (U) and the actual speed Uaz (UV) in the upstream part of the characteristic V (S), i.e. when accelerating the drive. When moving the workpiece at a reduced speed (section of the HD), frequency pulses -f arrive at the second input of the counter 11. When the workpiece reaches position D of the decoder 12, the second output removes the signal Unit, which leads to opening the key k and slowing the drive to a complete stop (section DE) and to the position of the stopped workpiece at a given stop position E, since. Regarding the operation of the decoder 12, it should be noted that at its first (second) output there is a signal Unit at several consecutive states of the counter 11, corresponding to the movement of the workpiece in the section ABOUT (OD). The main technical and economic advantage in the implementation of the predla-. control device unstoppable stopping of the moving workpiece is to reduce equipment downtime due to automation

790090

due to the increased accuracy of the device.

Formula | 3d formula

The control unit for the stopless motion of the moving workpiece, comprising a track pulse sensor, a speed sensor, a speed setpoint voltage reference, an information input unit, a decoder, a drive control unit comparing the elements whose first inputs are connected to the speed sensor, the I element whose first input is connected to track pulse sensor, a counter, the first input of which is connected to the information input unit, and the output is connected to the input of the decoder, the keys, the first inputs of which are connected respectively to the first and the second outputs of the setpoint voltage setting device, and the outputs are connected respectively to the first and second inputs of the drive control unit; the second input of the second key is connected to the second output of the decoder;

This is due to the fact that, in order to improve the accuracy of the device, it additionally introduces a trigger, the first and second inputs of which are connected to the outputs of the first and second comparison elements, respectively, and the output is connected to the second input of the And element, the second inputs of the first and second comparison elements connected, respectively, to the second and third outputs of the variable speed setpoint adjuster, the frequency divider, the input of which is connected to the track pulse sensor, the OR element, the first and second inputs of which are connected respectively but to the outputs of the frequency divider and the element And, and the output is connected to the second input of the counter, the first output of the decoder is connected to the second input of the first key.

Sources of information taken into account in the examination

1, USSR Copyright Certificate No. 25186J, cl. At 21, 37/00, 19772. USSR author's certificate No. 165286, cl. In 23 D 26/16, 1975.

figg

Claims (1)

Claim Control device for stopping a moving workpiece without stopping, comprising a path pulse sensor, a speed sensor, a voltage adjuster, speed settings, an information input unit, a decoder, a drive control unit, comparing elements, the first inputs of which are connected to the speed sensor, the element And, the first ι input of which is connected to a track pulse sensor, a counter, the first input of which is connected to the information input unit, and the output is connected to the decoder input, keys, the first inputs _of which are connected respectively to the first the second and second outputs of the voltage adjuster of the speed setpoint, and the outputs are connected respectively to the first and second inputs of the pressure control unit 2 by a drive, the second input of the second key is connected to the second output of the decoder, I distinguish 900907 8 from the fact that, in order to increase accuracy of the device, a trigger is additionally introduced into it, the first and second inputs of which are connected to the outputs of the first and second comparing elements, and the output is connected to the second input of the And element, the second inputs of the first and second comparing elements are connected The frequency divider, the input of which is connected to the sensor of the traveling pulses, respectively, is connected to the second and third outputs of the voltage regulator 5 is an OR element, the first and second inputs of which are connected respectively to the outputs of the frequency divider and the And element, and the output is connected to the second input of the counter, the first output of the decoder is connected to the second input of the first key.