SU1722717A2 - System for cutting articles into specified lengths - Google Patents

Abstract

The invention relates to the field of mechanical engineering, in particular, to equipment for controlling the cutting mechanisms of a lengthy product for measuring lengths during the course of the technological process. The purpose of the invention is to improve the quality of products. The system contains flying scissor controls that provide dimensional cutting of the product. When cutting a product by the signal Defect a situation is possible when the newly received product may be cut by the first cut less than the minimum allowable. To eliminate an emergency on the process line, automatic cut control is blocked in the system, and the moment of manual launch of scissors to cut the head piece is selected by the operator, followed by automatic transfer to dimensional cutting. 1 il.

Description

The invention relates to the machining of long products by cutting, for example pipes, rolled products, etc., can be used to control the cutting mechanisms of a long product to measured lengths during the process, and is an improvement to the author. No. 1542705.

The dimensional cutting system of the product contains a scissor positioner, the first input of which is connected to the output of the selector, the first and second group inputs of which are connected to the group outputs of the first code setter and the first counter, respectively, a second code setpoint sensor, a displacement sensor, connected to the first group input of the first counter mechanically connected to the next roller, a product defect sensor connected to the first trigger input. And element, first OR element, second counter, second OR element, first pulse generator, pulse sequence converter, pulse frequency divider, two delay lines and a shaper code, the first input connected to the second output of the scissor positioner, with the first input of the second counter, with the inputs of the first and second delay lines, whose outputs through the second and first elements OR are respectively associated with the second inputs of the first counter and the scissor positioner, the third input of which is connected via a pulse train to the displacement sensor. and the article and through the pulse frequency divider to the first input of the AND gate, a second input coupled to the second input of the first OR gate, the third input of the selector, a second input

VI

SIX VI

to

the second counter, the trigger output and through the first pulse shaper with the second inputs of the code generator and the second element OR, the output of the second counter is connected to the second input of the trigger, and the output of the And element - with the third inputs of the first counter and the code generator, the output of which is connected to the fourth input the first counter, in addition, the shaper code contains a trigger, pulse generator, the element And the counter, the output connected to the fault input of the trigger, the output of the last and the output of the pulse generator through the element And podkl It is compatible with the first input of the counter, the second input of the counter, the setup input of the trigger and the third input of the counter are the first, second and third inputs, respectively, and the output of the And element is the output of the code generator.

The known system of dimensional cutting is intended for dimensional cutting of the endless product and automatic cutting of a product defect, orienting it to the end of the finished product.

However, when using this well-known system for cutting the product on units with a finite length of the product to be cut, for example, when making a pipe with a pipe, the first product is obtained of an arbitrary length, including less than the minimum, which reduces the quality of the product and creates an emergency condition. the situation on the unit, as with a cut product with a length shorter than the minimum allowable for technological requirements, it can be stuck in the process line.

The purpose of the invention is to improve the quality of products and the elimination of emergency situations on the production line,

The goal is achieved by the fact that the product presence sensor, the third delay element, the second and third triggers, the second and third elements AND, the output of the product presence sensor are connected to the inputs of the third delay element and the second trigger, the second input through which the second element And is connected to the output of the third delay element, the second input of the second element And is connected to the button and the fourth input of the controller, the first output of the second trigger is connected to the second input of the third element And, n The first input is connected to the scissor control relay contact, and the output is connected to the second input of the third trigger, the first input of which is connected to the second output of the second trigger, the output of the third trigger is connected to the fifth input of the scissor positioner.

Comparative analysis with the prototype shows that the proposed system is characterized by the presence of a sensor for the end of the item being cut, a second pulse shaper, and an OR element in conjunction with the rest of the circuit elements.

The drawing shows a block diagram of the system of dimensional cutting of the product.

The drawing shows scissors 1 for cutting the measured lengths of the lengthy product 2 connected to the first output of the position regulator 3, the sensor 4 moving the product 2 mechanically coupled with the follower roller 5 is connected to the input of the pulse train 6, the output of which is connected to the third the input of the controller 3 and the input of the divider 7 pulse frequency, the output of which through the element And 8 is connected to the third inputs of the first counter 9 and the driver 10 code, the first input of the regulator 3 through the selector

11connected to the output of the first knob

12 code, the second group input of the selector 11 is connected to the group output of the first counter 9, the third input of the selector 11 is connected to the second input of the element OR 13, the input of the first shaper 14 pulses, the second input of the second counter 15, the second input of the second element And 8 and is connected to the trigger output 16, the product defect sensor 17 17, the first delay element 18, the second code setting unit 19, the second delay element 20, the second input of the trigger 16 is connected to the output of the second counter 15, the second output of the regulator 3 is connected to the second input of the driver 10. With the first input ohm second counter 15 and through delay elements 18 and 20 respectively to the outputs of the elements of the first 13, second OR 21, the outputs of which are connected respectively to the second inputs of the position regulator 3 and the first counter 9, the first and fourth inputs of which are connected to the code 19 and the output shaper 10 code respectively, the first input shaper 10 code is connected to the output of shaper 14 pulses. And the input of the second element OR 21, the first, second and third inputs of the regulator 3 are D-input, V-input and T-input of the counter 22, respectively And output control unit 23 is a first output of the regulator 3.

The shaper 10 code contains the trigger 24, the generator 25 pulses, the element And 26, the counter 27, the output of which is connected to the installation input of the trigger 24, the output of the latter and the output of the generator 25 through the element And 26 are connected to the second input of the counter 27, one of the inputs of the trigger 24 The first and third inputs of the counter 27 are respectively the first, second and third inputs, and the output of the AND 26 element is the output of the imaging unit.

The selector 11 constructively includes group elements 28, AND 29, OR 30. The output of the element OR 30 is the output of the selector 11, the group element AND 28 is connected to the first group of inputs of the element OR 30, the group element And 29 is connected to the second group of inputs, group The inputs of the And 28, 29 elements are the first and second inputs of the selector 11, the third input of which is the enable (inhibit) inputs of the And elements 28, 29.

Defect 31 on item 2 is detected by sensor 17,

The sensor 32 of the presence of the product 2 through the element 33 of the delay is connected to the first input of the second element I 34 and directly to the first input of the second trigger 35, the second input of which is connected to the output of the element And 34, the second input of which is connected to the button 36 manually start the scissors 1 and with the fourth input of the regulator 3, the first output of the trigger 35 is connected to the second input of the third element 37, the first input of which is connected to the contact 38 of the scissor control relay .1, the output of the element 37 is connected to the second input of the third trigger 39, the first input of which is li ne to the second output of the flip-flop 35, and an output - to the fifth input of regulator 3.

The controller 3 additionally introduces elements AND 40 and OR 41, connected in series with counter 22 and block 23, with the first input of the element OR 41 and the second input of the element AND 40 connected to the fourth and fifth input of the controller 3, respectively, the output of the element OR 41 is the second output of regulator 3.

As the sensor 4 for moving the product 2, for example, the PDF-3 2P.984.009 TU pulse sensor can be used.

As a defect sensor 17, for example, a flaw detector of type VD41N TU 25-06, 1692-74 can be used.

The delay elements 18 and 20 pulses serve to coordinate the processes in time. At the same time, the delay time of the pulse delay element 20 should be about 2 times longer than the delay on the delay element 18.

As a sensor 32 the presence of the product can be used, for example, a photo sensor type FRSU TU 36.1760-84 or a brushed electrical sensor.

The element 33 of the delay time can be made in the form of a typical element VL43 UHL 4.1. 24 V. 1-10 s.TU 16.523.585-80.

A button 36 P of the system serves to start the scissors 1 and sends a signal to the second input of the AND 34 element at the time of the manual start of the scissors 1 by the operator of the unit using the tool OR 41 and the block 23 of the regulator 3.

Contact 38 Back is an integral part of scissors 1 and closes while they are moving back (returning to its original position at the end of the next cut of product 2).

The remaining elements and components of the system can be implemented on the basis of typical IC series, for example, K155. K176. K561 and 5 etc.

The defect sensor 17 is mounted from the cutting axis of the scissors 1 in the opposite direction to the movement of the product.

2 apart

 min - - | max g L m S. s L m1

0 where LMMHM, 1 max is the minimum and maximum length of the finished products, respectively.

Moreover, in practice, their values are related to

Mr. I max .. o | min

DL m m.

In general, the length of the product on the cutting axis of the scissors (in the direction of movement of the product 2)

About I LMaKCM)

0 and the distance from the defect 31 of the product 2 to the cutting axis of the scissors 1 is equal to W

Sensor 32 is installed coaxially with sensor 17. The system works as follows. In the initial state, the triggers are 16, 35,

5 39, as well as 24 of the code generator 10. are in the initial state, in which in the selector 11 the group element And 28 is open and the group element And 29 is closed; the counter 15 is kept in its initial zero state; Element And 8 is open; in the shaper 10 of the code element And 26 is closed (the pulses produced by the generator 25 at the output of the element And 26 do not pass); element And 37 is closed; control element AND 40

5 3 is open.

At the beginning of the work (accepted conditionally for convenience of examining the proceeding processes) in the controller 3, the output Res of the counter 22 is given the Res command, a signal from which the block 23 starts the scissors 1, cutting off the finished product of a certain length (determined by the task recorded at the input D in the counter 22 ); impact through delay elements 18 and OR 13 on

5 V-input of counter 22, recording of information from the output of selector 11 (element OR 30) is provided in it; through the delay elements 20 and OR 21 on the V-input of the counter 9. it is written to

constants -Ј from the output of the setting device 19; A counter 27 is installed in the driver 10 of the code. .

The product 2, moving along the process line (indicated by an arrow in the drawing), provides with the help of the follower roller 5 and the sensor 4 the output of a sequence of pulses proportional in the number of pulses to the amount of movement of the product. The pulse sequence from sensor 4 passes through the pulse sequence converter block 6 (the price of each pulse leads to a typical unit of length, for example, 1 mm, 1 cm, 1 dm, etc.) enters regulator 3 at the subtracting input of the counter 22 and through the divider 7 into two and the open element And 8 passes to the subtracting input of the counter 9 and to the third input of the imaging unit 10 of the code (the summing input of the counter 27).

In this case, if there is no defect 31 on the product 2, then the signal Res from the output of the counter 22 of the regulator 3 will record information on the measured length from the output of the setting device 12, and the counter 9 - the constant –Ј s

master output 19.

The impulses of the length of item 2 that enter regulator 3 to the subtracting input of counter 22 provide for subtraction of previously recorded information before zeroing, at which the Res command will be issued and the auxiliary operations described above will be performed.

In the counter 27 of the driver 10 between the adjacent commands Res from the output of the counter 22, information is generated.

. In this case, a counter for counter 22 is formed in counter 9 in the case of cutting off the first of two finished products of equal length when the sensor 17 detects a defect 31 of product 2.

This assignment is determined from the following prerequisites. At the time the sensor 17 detects a defect 31, the length of the product from the defect (i.e., sensor 17) to the front end of the product, located behind the cutting axis of the scissors 1, is generally equal to the sum (+ H). According to the proposed algorithm, this length should be divided in half, thereby ensuring the orientation of the defect at the end of the finished product.

Since at the time of detection of a defect, the information in counter 22 should be replaced by a new task (instead of dimensional cutting, the product should be cut according to the Defect signal), and the product length beyond the cutting axis of the scissors 1 is I, obviously, the task to cut the product by the Defect signal will be

U + I C - I

2 2

This task is formed by counter 9

The process of dimensional cutting of the product will be

pass by the method described before the occurrence of defect 31 of product 2 in the zone of sensor 17. When a signal arrives, a defect from sensor 17 through element OR 34 triggers 16 to the state when

the group element AND 28 is closed in the selector 11 and the group element AND 29 is opened; via the element OR 13, the counter 22 of the regulator 3 records information from the counter 9 (the task for cutting the first product of two of the same length by the Defect signal; the AND 8 element is closed; the output signal 1 of the trigger 16 closes the driver 14, the short signal of which passed through

the element OR 21, provides a record of the constant in the counter 9 from the output of the setter 19; the prohibition of keeping the counter 15 in the initial zero state is lifted.

In the driver 10 signal 1 output

trigger 24 opens element 26 and provides, using pulses from generator 25, the information from counter 27 (half length I) is copied to counter 9. Upon completion of the census of this information, the overflow pulse from counter 27 output flips back to its original state And 26 for passing the pulses of the generator 25.

Thus, after the sensor 17 detects a defect on the product 2 in the counter 22

there will be information. Uh

and in the counter 9

The incoming pulses of the product length to the subtractive input of the counter 22 provide for its zeroing and outputting the Res signal (the first Defect after the arrival of the signal), which, using block 23 and scissors 1, causes the first finished product to be cut by the Defect signal; counter 15 records the number using delay elements 18 and OR 13 writes information to counter 22 of

counter 9; sets counter 27 of driver 10 to its initial state; using delay elements 20 and OR 21, provides a counter 9 to record a constant from the output of the setter 19. Continuing to arrive at the subtractive input of the counter 22, the pulses of the length of the product 2 provide for zeroing it and issuing the Res command, which is controlled by the block 23 of the regulator 3 and scissors 1 securing the second finished product by the Defect signal is provided; the counter 15 counts the second unit (the second finished product after the arrival of the Defect signal), at which, by the overflow signal of the counter 15, the trigger 16 returns to its initial state, providing switching elements And 28, And 29, And 8 to the dimensional cutting of the product; counter 27 is zeroed; the meter 22 records information about the measured length of the product from the output of the unit 12; The counter 9 records a constant from the output of the setter 19. At this cutting of the product by the signal Defect ends and a measured cut of the product 2 begins.

The operation of the system 2 in the event of its end reaching the zone of the sensor 32 is performed as follows.

When the end of the product 2 leaves the zone of the sensor 32, the trigger 35 is set to state 1, in which the element 37 is opened; the hold signal in state 1 of trigger 39 is removed.

After scissors 1 cut the product 2 (after the arrival of the signal End of the product 2 from the sensor 32) during the return of the scissors 1 to the initial state, the contact 38 of the Back relay switches on, sending a signal 1 from the power source to the first input of the And 37 element. on the second input is opened by a signal from the output of the flip-flop 35. then the output signal of the element 37 sets the flip-flop 39 to the state O, at which the element I 40 of the regulator 3 closes, prohibiting the signal from the Res from the output of the counter 22 to the input of the unit 23 to start the scissors 1 ,

In this state, the system remains until the front end of the next product 2 arrives in the zone of the sensor 32.

From the front end of the product 2, the sensor 32 is triggered, with a signal from the output of which the time delay element 33 is triggered. The time delay is chosen taking into account that during its operation the front end of the product has covered a distance of not less than

U g max + L m.

Despite the fact that the newly received product 2 will come into contact with roller 5 and the counter 22 of the controller 3. Receiving the movement pulses of the product 2, taking into account the information contained in it, can issue the Res command, the last to the output of the unit

23 control of the scissors 1 will not work, since in this case the element AND 40 is closed.

Taking into account the permissible lengths of finished products, the operator selects the moment of manual 5 start of scissors 1. At this moment, by pressing the button 36, using the element OR 41 and the block 23 of the regulator 3; he starts scissors 1 to cut the head finished product. At the same time, the signal from button 36 passes through an open (by a signal from the output of element 33) element 34 to the second input of trigger 35. sets it to its original state, at which element I 37 stands for-. covered; trigger 39 is set to state 5; element 40 of regulator 3 is open. After the time delay has elapsed, the element 33 restores its original state by closing the AND element 34 before the arrival of the next front end of the product 2.

0 The signal for the manual start of scissors 1 from the output of the OR 41 element through the block 23 is fed to the second output of the regulator 3, and the elements of the system are started up as described when considering dimensional cutting.

5 The proposed system of measuring cuts ensures the orientation of the defect at the end of the finished product; the length of the finished products is not less than the minimum and not more than the maximum allowable dimensional lengths; improving the quality of finished products: elimination of an emergency on the production line in case of abnormal cutting of the end product, when the remainder of the product may be less than the minimum allowable length.

Claims (1)

5 claims System of a measured cut of a product on an auth.St. N 1542705, characterized in that, in order to improve product quality and eliminate emergencies, an additional product presence sensor, a third delay element, second and third triggers, second and third And elements, and a manual scissor trigger button are added, one contact of which is connected to the power source, while the output of the product presence sensor is connected to the first input of the second trigger and, through the third delay element, to the first input of the second element I, the second input of which is connected to another time stamp of the manual scissor trigger button and the fourth input of the regulator, and the output to the second input of the second trigger, the first input of the third element I is connected with an additional contact of the scissor control relay, and the second input with the first output of the second trigger the second output of which is connected to the first input of the third trigger, the second input connected to the output of the third element I, and the output to the fifth input of the controller.