SU1146541A1 - Device for discrete measuring of moving object length - Google Patents

Abstract

A DEVICE FOR DISCRETE MEASUREMENT OF LENGTH OF MOVING OBJECTS, containing an object presence sensor, a path sensor, the first and second pulse counters, the first comparison unit; whose input is connected to the outputs of pulse counters, the code of the path sensor is connected to the first input of the first counter, and a pulse generator, different so that, for the purpose of discrete measurement of the length of moving objects, the distance between which on the conveyor is less than a predetermined length, it is equipped with the first and second triggers, the first, second and third elements AND, e NOT, a third trigger sequentially connected to the object presence sensor, a fourth AND element, a third counter, a second comparison unit and an OR element whose output is connected to the device output and the third input of the first counter, the second output of the third trigger through the first AND element connected to The first input of the second counter, the output of the first comparison unit is connected to the second input of the OR element, the output of the pulse generator is connected to the second inputs of the first and fourth elements, And, the output of the path sensor through the first The new trigger is connected to the third inputs of the first and fourth elements I, the output of the sensor path through the element is NOT connected to the first inputs of the second and third elements I, whose outputs are connected respectively to the second inputs of the second and third counters, as well as the first and second inputs of the second trigger The outputs of which are respectively connected to the third input of the first and the second. units of comparison, the output of the first element I is connected to the second input O5 of the third element I, the output of the fourth element II is connected to the second input of the second element I.

Description

The invention relates to a measurement technique and can be used in forestry and woodworking industry for automatically marking wood into equal parts (lengths).

J A device for automatic measurement and registration of logs on longitudinal conveyors is known, comprising sensors for the path, length and diameter, a decoder, a switch, an adder and a recording unit. The path sensor is kinematically connected with the conveyor and, as it moves, pulses arriving at one of the inputs of the length sensor are discontinued. Its second input receives a signal from the diameter sensor. After the measurement of the measured log in the sensor, the signal coming from the diameter sensor disconnects the pulses from the path sensors through the length sensor lj.

The disadvantages of this device are low, measurement accuracy and reliability in operation, this is due to the kinematic connection of the track sensor with moving frequent conveyors, as a result of which the first piece of the log to be measured is more subsequent.

The closest to the invention by technical essence is a device for discrete measurement of the length of moving objects, comprising an object presence sensor, a path sensor, impulse counters, a comparison unit and a pulse generator, which is connected to the first inputs of pulse counters, whose outputs are connected to the comparator inputs, the output of which is connected to the output of the device and the second input of the first pulse counter, the diameter sensor is connected to the second input of the second pulse counter, the output of the path sensor is connected to the third im impulse counter inputs 2.

However, the known device does not provide measurement of objects, the distance between which on the conveyor is less than the normalized length of the segments, i.e. The device has limited functionality. Fulfillment of this condition reduces the performance of the conveyor, and non-fulfillment leads to malfunction of the device.

The aim of the invention is to enable the Discrete measurement of the length of moving objects, the distance between which on the conveyor is less than a predetermined length (less than the length of the normalized segments).

The goal is achieved by the fact that a device for discrete measurement of the length of moving objects, containing an object presence sensor, a path sensor, first and second pulse counters, a first comparison unit, whose input is connected to the outputs of a pulse counter, the output of the beam sensor, and a pulse generator, equipped with the first and second triggers, the first, second and third elements AND, the element NOT, the third trigger connected in series with the object presence sensor, the fourth element AND, tert the second output of the third trigger through the first element I is connected to the first input of the second counter, the first output of the first block of comparison is connected to the second input of the OR element, the generator output is connected by a counter, a second comparison unit and an OR element whose output is connected to the output of the device and the third input of the first counter. the pulses are connected to the second inputs of the first and fourth elements I, the output of the path sensor through the first trigger is connected to the third inputs of the first and fourth elements I, the output of the sensor of the path through the element is NOT connected to n The first inputs of the second and third elements are And, the outputs of which are connected respectively to the second inputs of the second and third counters as well as to the first and second inputs of the second trigger, the outputs of which are respectively connected to the third input of the first and second blocks of comparison, the output of the first element And is connected with the second input of the third element And, the output of the fourth element And is connected with the second input of the second element I.

The drawing shows a block diagram of the proposed device.

The device contains a pulse generator 1, the first pulse counter 2, the second pulse counter 3, the third pulse counter 4, the first comparison unit 5, the second comparison unit 6, the element OR 7, the first 8, the second 9, the third 10, the fourth 11 elements And, the first 12, second 13, third 14 triggers, element NOT 15. Moving objects 16 and 17 interact with object detection sensor 18 and path sensor 19. The device works as follows. When the conveyor is turned on, the counters and triggers of the device are automatically set to the initial (zero) state (the device for automatically setting the circuit elements to the initial position when the power is turned on is not shown) and the pulse generator 1 starts up. The connection of the flip-flops on the diagram when the power is turned on is conventionally depicted O and 1 at the corresponding outputs. From the output of generator 1, pulses are applied to elements 8 and 11 and counter 2. At the time of the occurrence of the measured object 16 in the sensor sensor 18, the object is detected (position i), the counting input of the trigger 14 is energized, the pulse 14 changes condition. Element 11 is turned off for passing ig pulses from generator 1. Counter 4 stores the pulses received on it. By the first impulse from element 11, the zero states of trigger 13 and counter 3 are confirmed through element 9 and then when the front end of the moving object 16 crosses the one-hundredth turn of the path sensor 19 (position 11) located along the motion of the object 16 at a distance equal to a given length of the segment, the latter triggers and sends a signal to the counting input trigger 12 (flip-flop 12 changes its state and the element 11 is locked, excluding the further arrival of pulses from the generator 1 to the counter 4) and simultaneously counting pulses counter m 2 coming from the generator 1 pulses. After the number of pulses counted by the counter 2 pulses becomes equal to the number of pulses received in the counter 4 pulses, which indicates the passage of the next segment through the object detection sensor 18 (til position), the comparison unit 6 outputs a comparison signal (since at its permitting input there is a signal with -trigger 13), which through the element OR 7 enters the functional diagram of the volume meter. At the same time, by the coincidence signal, the first pulse counter 2 resets the readings and returns to its original position, continuing to count the pulses from zero. The process of counting pulses continues until their number is equal to the number of pulses previously counted by 4 pulses at the beginning of the cycle, followed by the return of counter 2 im. pulses to the initial position and the beginning of a new reference, and repeats as long as the movement of the measured moving object in front of the sensor 19 is moved. At the moment of intersection of the sensor track 19 by the rear end of the moving object 16 (position Y), the latter sends a command to return the counter of 2 pulses to the initial position. At the output of the element HE 15 a signal appears. When the next measured object passes through the sensor 18, the object is detected regardless of the distance following the previous log (at the moment when the object to be measured 17 appears in the sensor position of the object detection sensor 18 (position IV), it is fed to the counting input of the trigger 14 the pulse, the trigger 14 changes its state, the element AND 8 opens for the passage of pulses from the generator 1. The counter 3 memorizes the pulses received to it.The first pulse from the element 8 And 8 is set to the zero position, and the trigger 13 is in a position in which a resolution signal is supplied from its output to a comparison block 5 (according to comparison block block 6, the comparison resolution signal is removed) Then, when the front end of the moving object 17 crosses the track sensor 19 (position Y1), the latter triggers and issues a signal to the trigger 12 (the trigger 12 changes its state and the AND 8 element closes, excluding further receipt of pulses from generator 1 to counter 3) and simultaneously allowing the pulses to be counted by counter 2 received from generator 1 sov. After the number of pulses counted by the counter of 2 pulses becomes 3 times the number of pulses received earlier in the counter, 3 pulses, which indicates the passage of the next segment through the object detection sensor 18, the comparison unit 5 raises the comparison signal (since the enable input has a signal with trigger 13), which through the element OR 7 enters the functional circuit of further processing. At the same time, by the coincidence signal, the first counter of 2 pulses resets the display and returns to the initial position, a count of pulses from zero.

The pulse counting process continues until the moment when their number becomes equal to the number of pulses counted by the pulse counter 3 at the beginning of the cycle, with the subsequent return of the pulse counter 2 to its original position and the beginning of a new count, and repeats as far as the measured measurement moves. object in front of the sensor 19 way. At the moment of intersection of the alignment of the sensor path 19 by the rear end of the object 17, the latter sends a command to right-click the counter of 2 impulses to its original position. At the output of element 15, a signal appears.

When the next measured object passes through the object detection sensor 18, regardless of the distance following the previous object 17, sensor 18 receives a pulse at the counting input of trigger 14, trigger 14 changes its state, AND 11 opens for passing pulses from generator 1 The counter 4 makes memorization of the received impulses. The first pulse from element 11 (in the presence of a signal from element 15) counter 3 is set to the zero position, trigger 13 is also set to the zero position.

Further, the operation of the device continues as described.

The proposed device has wider functional capabilities in comparison with the known ones by providing the measurement of objects the distance between which on the conveyor is less than the length of the normalized segments, which increases the productivity of the conveyor and eliminates malfunctions.

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Claims (1)

DEVICE FOR DISCRETE MEASUREMENT OF THE LENGTH OF MOVING OBJECTS, containing an object presence sensor, a path sensor, first and second pulse counters, a first comparison unit, the input of which is connected to the outputs of the pulse counters, the output of the track sensor is connected to the first input of the first counter, and a pulse generator, characterized in that, for the purpose of discrete measurement of the length of moving objects, the distance between which is less than the specified length on the conveyor, it is equipped with first and second triggers, first, second and third elements AND, element NOT, a third trigger connected in series with an object presence sensor, a fourth AND element, a third counter, a second comparison unit and an OR element, the output of which is connected to the device output and the third input of the first counter, the second output of the third trigger through the first AND element is connected to the first the input of the second counter, the output of the first, comparison unit is connected to the second input of the OR element, the output of the pulse generator is connected to the second inputs of the first and fourth elements AND, the output of the path sensor through the first trigger is connected inen with third inputs of the first and fourth elements AND, the output of the path sensor through the element is NOT connected to the first inputs of the second and third elements AND, the outputs of which are connected respectively to the second inputs of the second and third counters, as well as with the first and second inputs of the second trigger, the outputs of which respectively, connected to the third input of the first and second comparison units, the output of the first element And connected to the second input of the third element And the output of the fourth element And connected to the second input of the second element I. SU, "1146541 f 1146541