SU1052845A2 - Device for gauging length of moving article - Google Patents

Abstract

DEVICE FOR MEASUREMENT, LENGTH OF MOVING PRODUCTS on the author. St. 787885, characterized in that, in order to improve the reliability of measurements, it is equipped with a second trigger, sensor of the initial position of the product, comparison elements, the number of which is equal to the number of product presence sensors, blocking unit, the number display board of the defective product presence sensor, and the sensor output the initial position of the product is connected with the railing by the input of the second trigger, the second input of which is connected to the output of the first element OR, the output to the first inputs of all elements of the comparison, the second input of each of the elements tim connected to the output of the sensor it sootvetstvukvdego presence article, the output of each comparator element is connected to its corresponding inputs lock block and board registration entry-numbers neis article presence sensor. (L

Description

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4 ;: 01 The invention relates to a measuring technique and can be used, for example, to measure the length of a rolled metal or pipes. According to the main auth. No. 787885, a device for measuring the length of moving articles is known, which contains sensors of product availability, a differentiation unit of two OR elements is connected to their outputs, the inputs of one of which are connected to the positive outputs of a differentiation unit, the second to negative outputs of a differentiation unit, a memory unit, a coincidence element, one input of which is connected to the output of the first element OR, the second through the memory block, a trigger, one input of which is connected to the output of the matching element, the second with the output of the second element a-or. a counting pulse generator, including a sequentially connected impulse device, kinematic 6 connected to the measured product, and a key element, the output of the trigger is connected to the control input of the key element C 13. However, the known device is characterized by an insufficient reliability of measurements due to the fact that in the event of the failure of one or more sensors of the presence of the device, the device will give false readings. The purpose of the invention is to increase the reliability of measurements. The goal is achieved by the fact that the device for measuring the length of moving products is equipped with a second trigger, an initial product position sensor, comparison elements, the number of which is equal to the number of sensors and products, a blocking device, a board for registering the number of a faulty sensor and an external position sensor. It is connected with the first input of the second trigger, the second input of which is connected to the output of the first element OR, the output to the first inputs of all as compared, the second input of each of the elements TM The sensor is connected to the output of the corresponding product availability sensor, the output of the reference element is connected to the corresponding inputs of the block and the registration number of the defective product presence sensor. The drawing shows the block diagram of the proposed device. The device contains sensors 1 for the presence of a product, for example photo sensors, a differentiation unit 2, elements OR 3 and 4, a memory block 5, a coincidence element 6, a first trigger 1 a generator 8 of counting pulses, including a pulser 9, kinematically connected with the measured part, e.g., through the roller 10 and the key element 11, the sensor 12 of the initial position of the product, for example, a limit switch mounted above the axis of the sensors 1 for the presence of the product, the second trigger 13, comparison elements 14, the blocking block 15, for example, AND LI 16 and element 17, the board 18 of registration of the number of the faulty sensor of the presence of the product. The device measures the length of the product 19 moved by the roller 20, the output of each sensor 1 of the presence of the product is connected in parallel to the coarse counting and recording channel (the counter and other channel elements are not marked) to the differentiation unit 2 and to the comparison elements 14. The positive outputs of the differentiation unit 2 are connected to the OR element 3, the output of which is connected to the memory unit 5 and the first input of the coincidence element 6, the second input of the latter is connected to the output of the 5 pgil unit, the output of the block b is connected to one of the trigger inputs 7. Negative the outputs of the differentiation unit 2 are connected to the OR 4 element, the output of which is connected to the second input of the trigger 7. The trigger 7 is connected to the coarse counting channel and to the key element 11, which is connected to the exact counting and registration channel (not about the input is provided with an impulse device 9. The pulsator 9 is rigidly connected to the measuring roller 10, it contacts with the product 19 being moved on the roller table 20, and the presence sensors 1 are installed along the roller table at equal distances. The initial position sensor 12 is connected to one of the inputs the second trigger 13, the second input of which is connected to the output of the element OR 3. The output of the second trigger 13 is connected to one of the inputs of each comparison element 14. The outputs of the comparison elements 14 are connected in parallel to the inputs of the scoreboard 1c and the inputs of the blocking block 15. Block 15 includes, for example, an OR 16 element and an AND 17 element. The OR 16 element is connected to the first input of an AND element 17, the second input of which is connected to the channel of forming a signal for supplying the product 19 to the measurement zone (not shown} and the output to the flow control scheme of the product (not shown). The device operates as follows: Article 19 is supplied to the zone of location of the sensors 1, and as soon as

the product will occupy a position above the axis of the location of these IKOB sensors, the initial position sensor 12 is triggered

product, giving a signal to the input of the second flip-flop 13. At the exit of the flip-flop 13, a signal appears that is fed to the first inputs of the comparison elements 14, the second inputs of which receive the corresponding potentials from the sensors 1. At different levels of the input potentials, at least one - The one of the 14 comparison elements, with its output, signals the inoperability of the corresponding sensor 1 on the display 18 and the input of the blocking block 15, which prohibits

Chu products directly into the location of the sensors 1.

After the malfunction of the sensor 1 is eliminated, a signal is barred from the output of the block 15, which prohibits the supply of the product 20 directly to the zone of location of the sensors 1.

Further, the product 19 is supplied directly to the location of the sensors 1. Depending on its length 25, the product darkens one or another number of sensors 1, producing signals in the form of high potentials, signals, falling on the differentiation unit 2, are converted into pulses of short positive polarity .

Impulses come through ele. ment OR 3 to the input of block 5 and the first input of the element b coincidence. After 35 times longer than the pulse duration, from the differentiation unit 2, a high potential signal appears at the output of the memory unit 5, which is fed to the second input 40 of the coincidence element 6. At its output, there is no signal due to its absence at the first input.

The product 19 begins to move with the roller conveyor 20, and the roller 10 begins to roll the product around. At the moment when the front end of the product 19 of any of the sensors 1 of the block 2 of the diffusion generates a pulse of short duration positive polarity, which through the OR element 3 enters the memory block 5 and the first input of the coincidence element 6.

The position of the memory block 5 does not change, and at the output of the coincidence element 6 there appears a signal in the form of a pulse of short duration.

This impulse, falling on the first input of the trigger 7, overturns it.

The signal from trigger 7 opens the key element 11 and the pulses from the generator 8 counting pulses begin to flow into the channel of exact counting and registration. At the same time, this signal is used in the coarse counting channel to count the number of sensors that are currently covered by a given time, as a result of which the number of units of product length becomes known.

At the moment when the rear end of the product 19 closest to it in the direction of movement of sensor 1, differentiation unit 2 produces an impulse of short duration negative polarity, which through the element OR 4, falling on the second input of trigger 7, returns it to its original state. The key element 11 is closed, and the pulses from the generator 8 of the counting pulses no longer flow into the accurate counting channel. Measurement is complete. A command is issued to reset the measured product 19 from the roller table 20 and reset the memory block 5.

Thus, the possibility of false measurements at the exit and is eliminated. one or more product availability sensors.

Claims (1)

DEVICE FOR MEASUREMENT I LENGTHS OF MOVING PRODUCTS by author. St. No. 787885, characterized in that, in order to increase the reliability of measurements, it is equipped with a second trigger, a sensor for the initial position of the product, comparison elements, the number of which is equal to the number of sensors for the availability of the product, a blocking unit, a registration board for registering the number of the faulty product presence sensor, and the output the sensor of the initial position of the product is connected to the first input of the second trigger, the second input of which is connected to the output of the first OR element, the output to the first inputs of all comparison elements, the second input of each of the comparison elements with It is connected to the output of the product availability sensor corresponding to it; the output of each of the comparison elements is connected to the inputs of the blocking unit and the registration board of the number σι of the right product availability sensor corresponding to it.