RU69981U1 - DEVICE FOR AUTOMATIC MEASUREMENT OF LENGTH AND PIPE MOVEMENT SPEED - Google Patents

Abstract

The utility model relates to measuring technique and can be used to measure the length and speed of products in pipe production. A device for automatically measuring the length and speed of the pipes contains a measuring system based on photosensors and a counting and solving system, including a signal conversion unit, a counter comparison unit, a time pulse generator, a speed calculation unit, a time interval calculation unit, and a length and output calculation unit results. The technical result is an increase in the accuracy of measuring the length and speed of movement of pipes in the flow of a pipe-profile electric welding unit and ensuring control of the measured parameters. The developed blocks of the computer-decisive system, which are the basis for the functioning of the device, are easily customizable, they allow you to quickly process information and control the process of manufacturing pipes of measured length. The operation of the device is reliable, ensures full compliance with the requirements of technology for the production of pipes and reduces the time of the technological cycle.

1 s.p. f-ly, 3 ill.

Description

The utility model relates to measuring technique and can be used to measure the length and speed of products in pipe production.

A known device for measuring the length of a rolling rolled stock containing n photosensors, a counter for the number of triggered photosensors, a computing unit, a source of a plane parallel light beam, a condenser with a photocell installed in its focus, forming an optical coupled system, a comparator, two tracking-storage units, two analog -digital converter, logic unit and display unit (AS USSR No. 1610238, class G01B 7/04, publ. 30.11.90, bull. No. 44).

A disadvantage of the known device is the relatively low accuracy of determining the length and speed of the cut strip.

Closest to the proposed utility model is a device for measuring the length of pipes, containing a rack, a roller roller table with rollers equipped with external coils, a coarse measuring system in the form of basic sensors located along the roller table and a measuring system for accurately measuring the position of the front end. The device is equipped with guides made with a bilateral bias. Both measuring systems are based on photosensors, the elements of which are located on both sides of the roller table, and the optical axes in each pair are oriented parallel to the axes of its rollers, with the input side along the side of the pipe moving the roller table, the photosensor elements are located above the rack plane, and on the output side of the roller table it is perpendicular to it axles mounted guides. The counting-decisive unit together with the systems of photosensors for coarse and accurate reading forms

measuring part of the device. The counting-decisive block contains a trigger, AND and OR elements, a pulse counter, code converters, an adder, an interpolation unit, a counter, a pulse generator, two registers, a computing unit, and a delay element. (USSR AS No. 446731, G01B 5/02, publ. 11/30/1978, bull. No. 44; USSR AS No. 1224559, G01B 7/04, publ. 04/15/1986, bull. No. 14).

The disadvantage of this device is the high duration and complexity of the setup, low measurement accuracy and applicability only when sorting dimensional (cut) pipes.

The technical task of creating a utility model is to obtain a given pipe length and determine its speed directly in the flow of a pipe-profile electric welding mill (TPESA), increase the accuracy of determining the pipe length and ease of setup of the device.

The problem is solved in that in a device for automatically measuring the length and speed of movement of pipes containing a measuring system based on photosensors and a counting and solving system, according to a utility model, the counting and solving system contains a signal conversion unit for signal processing together, coming from the photodetectors of both photosensors and inverting the signal from the first photodetector at certain points in time, the counter comparison unit, designed to implement counting temporary pulses during the movement of the front end of the pipe from the first photosensor to the second, a temporary pulse generator designed to generate time pulses of the same duration, a speed calculation unit for processing time signals of the front end of the pipe passing the distance between the photosensors and calculating the average pipe speed, unit for calculating time intervals intended for counting time pulses from the generator and calculating inte shafts time corresponding to the passage of the entire cut of the tube past the second photodetector,

a unit for calculating the length and outputting the results, intended for calculating the length of the cut part of the pipe and for displaying the calculation results to process personnel, the output of the second photodetector connected to the first input of the signal conversion unit, the output of the first photodetector connected to the second input of the signal conversion unit, the output of which is connected with the first input of the comparison unit with the counter, the second input of which is connected with the output of the time pulse generator, and the output of the comparison unit with the counter is connected to the input of the speed calculation unit, the first input of the time interval calculation unit is also connected to the output of the time pulse generator, the second input of the time interval calculation unit is connected to the first output of the speed calculation unit, and the second output of the speed calculation unit and the output of the time interval calculation unit are connected respectively the first and second input of the length calculation unit and the output of the results.

The technical result that can be achieved by using the proposed utility model is that the introduction of a signal conversion block, a comparison block with a counter, a time pulse generator, a speed calculation unit, a time interval calculation unit, a length and output calculation unit The results made it possible to increase the accuracy of measuring the length and velocity of pipes in the TPESA flow, to ensure control of the measured parameters and to carry out coordinated automatic control those reflected in the impact. The developed blocks of the computer-decisive system, which are the basis for the functioning of the device, are easily customizable, they allow you to quickly process information and control the process of manufacturing pipes of measured length. The operation of the device ensures full compliance with the requirements of technology for the production of pipes and reduces the time of the technological cycle.

The essence of the utility model is as follows.

In the computer system, the introduced electronic units are intended for:

- signal conversion unit - inverts the signal from the first photodetector: in the presence of a light signal on it - to zero level (no signal), in the absence of a light signal on it - to the level of a logical unit (there is a signal). The second photodetector turns on (in the presence of a signal) or turns off (in the absence of a signal) the output stage of the signal conversion block;

- a comparison unit with a counter - calculates the time pulses during the movement of the front end of the pipe from the first photosensor to the second and calculates the time during which the front end of the pipe passes a fixed distance between the photosensors; this time is necessary to calculate the speed of the pipe;

- a generator of temporary pulses - generates electrical signals of a certain frequency in the form of a series of consecutive pulses of the same duration. The signal frequency is selected depending on the established base distance between the photosensors and should be such that the base distance is a multiple of the duration of one pulse;

- speed calculation unit - processes the time signals of the distance between the photosensors passing by the front end of the pipe and calculates the average speed of the pipe. The number of pulses during the counting time (for the same duration) can serve as a measure of speed, since the time (counting) between the overlap of the light flux is inversely proportional to the speed of the tube (for a fixed base distance (l) between the photosensors);

- unit for calculating time intervals — calculates the time pulses from the generator and determines the time intervals corresponding to the passage of the entire cut part of the pipe past the second photosensor;

- a unit for calculating the length and outputting results - determines the length of the cut part of the pipe and displays the calculation results to the process personnel.

Figure 1 presents a functional block diagram of a device for automatically measuring the length and speed of movement of pipes.

The device comprises a measuring system 1 made on photosensors 2, 3 with LED emitters 4, 5 and a counting and solving system 6, comprising a signal conversion unit 7, a comparison unit with a counter 8, a time pulse generator 9, a speed calculation unit 10, an interval calculation unit time 11, a unit for calculating the length and outputting results 12. The device is implemented in the TPESA stream, where the following notation is adopted: 13 - “cut off” pipe, 14 - live roll, 15 - the main array of the endless pipe, 16 - flying detachable machine.

The measuring system 1 contains photosensors, including photodetectors 2, 3 and LED emitters 4, 5 mounted opposite them, located in the direction of the pipe 13 in series at the base distance (l) from each other. The optical axis of the photodetectors 2, 3 and LED emitters 4, 5 are perpendicular to the direction of movement of the pipe 13.

The measuring system 1 is connected to the computing system 6 through the output of the second photodetector 3, connected to the first input of the signal conversion unit 7, and the output of the first photodetector 2, which is connected to the second input of the signal conversion unit 7, the output of which is connected to the first input of the comparison unit with a counter 8, the second input of which is connected to the output of the time pulse generator 9. The output of the comparison unit with the counter 8 is connected to the input of the speed calculation unit 10. The first input of the time interval calculation unit 11 is also connected n with the output of the time pulse generator 9. The second input of the time interval calculation unit 11 is connected to the first output of the speed calculation unit 10, and the second output of the last and the output of the time interval calculation unit 11 are connected respectively with the first and second inputs of the length calculation unit and outputting results 12.

The device operates as follows. In the initial state (before the next cut), the light fluxes of the optical emitters are blocked

the main array of the “endless” pipe 15. Photodetectors 2, 3 are in the zero state. The signal from the photodetector 2 is inverted by the electronic circuit of the signal conversion unit 7 to the level of a logical unit, but it does not enter the control input of the comparison unit with the counter 8 through the output stage, since the output stage of the signal conversion unit 7 is “closed” by the photodetector signal 3. The electronic circuit blocks - Resolving systems are pending.

The computing and solving system 6 is also in a standby state after the next cut, when the “cut off” pipe 13, having received acceleration from the rollers of the discharge roller table 14 and separated from the main array of the “endless” pipe 15, sequentially crosses the rear axes of the optical axes of photodetectors 2, 3.

At the moment of crossing the rear end of the "cut off" pipe 13 of the optical axis of the photodetector 2, the photodetector 2 goes into the state of a logical unit. The signal from the photodetector 2 in the signal conversion unit 7 is inverted to a zero level, but does not enter the control input of the comparison unit with the counter 8 through the output stage, since the output stage of the conversion unit is “closed” by the signal of the photodetector 3. At the moment the rear end crosses “cut off” the pipes 13 of the optical axis of the photodetector 3, the light fluxes of the optical emitter 5 are not blocked by the pipe 13. Photodetectors 2, 3 are in a single state (at their outputs there is a level of a logical unit). The signals from the photodetectors 2, 3 are fed to the inputs of the signal conversion unit 7. The signal from the photodetector 2 in the signal conversion unit is inverted to zero and through the output stage of the unit, open by the signal from the photodetector 3, is fed to the control input of the comparison unit with counter 8. So as the signal of the zero level arrives at the input of the comparison unit with counter 8, the counter of block 7 is in the standby state. The count of pulses coming from the generator of temporary pulses is not maintained.

The counting and solving system 6 enters the counting state when the head part of the main array of the “endless” pipe 15 successively intersects the optical axes of the photodetectors 2, 3.

At the moment the front end of the pipe 15 intersects the optical axis of the photodetector 2, the light flux going to the photodetector 2 is blocked by the pipe 15. The photodetector 2 goes into zero state. Since the light flux to the photodetector 3 is not blocked by the pipe and the photodetector 3 is in a single state, the output stage of the electronic circuit of the signal conversion unit 7 is open. The signal from the photodetector 2 is inverted in the signal conversion unit 7 to the level of a logical unit, fed to the control input of the comparison unit with the counter 8 and starts the counting of the signals coming from the time pulse generator 9.

At the moment the front end of the pipe 15 intersects the optical axis of the photodetector 3, the light flux going to the photodetector 3 is blocked by the pipe 15. The photosensor 3 goes to zero. The output stage of the electronic circuit of the signal conversion unit 7 is closed, the count of pulses coming from the temporary pulse generator 9 during the time (counting) between the overlap of the light fluxes in the comparison unit with the counter 8 is stopped. The signal with the counting data is transmitted to the speed calculation unit 10, in which the data is processed, the speed of the main array of the “endless” pipe 15 is calculated, and transmitted to the length calculation unit and outputting the results 12.

In the block for calculating the speed 10, at the moment of arrival from the comparison unit with the counter 8 of the signal (with counting data), a signal is generated (in the form of a single pulse), which starts the countdown of the signals arriving at the block for calculating the time intervals 11 from the time pulse generator 9. At the time of the arrival of another the signal from the speed calculation unit 10, when the pulse counting starts to calculate the speed, the pulse counting in the time interval calculation unit stops, the counter goes into a standby state. With the same pulse duration coming from

generator of temporary pulses 9, their number during the calculation is proportional to the time between the overlap of the light flux from the LED emitter 5 to the photodetector 3. Information about the time is transmitted to the length calculation and output unit 12, where the information is processed in real time by calculating the product of the speed of the pipe for the time of her movement. Unit 12 for calculating the length and output of results provides a display of the state of the process according to the measured parameters of the welded pipes.

The methodology for determining the length and velocity of the pipes is as follows. It is assumed that the speed of the main array of the “endless” pipe 15 varies in time, but during (t) the head of the pipe passes the section between the photodetectors 2, 3 remains constant. With the known length of the section (l), the speed of the pipe (V _i ) is determined from the relation: V _i = l / t _i .

The pipe length L _{i is} calculated by the formula: L _i = V _cp * ΔT _i , where

i = 1, 2, 3 ... - serial number of the measurement;

V _cp = (V _i + V _{i + 1} ) / 2 - average speed of movement (“i-th”) of the pipe between two consecutive measurements (mm / s);

ΔT _i is the time interval between two consecutive measurements (s).

Figure 2 presents the data obtained in the process of controlling the speed and length of pipes using a device for automatically measuring the length and speed of movement of pipes in the production of welded pipes D _at 20 × 2.5 mm GOST 3262-75 at TPESA 20-76 in the workshop manufacture of pipes and electrodes (CPTE). Pipes were produced with a length of 10,300 mm with the requirements for maximum deviations along the length of +150 mm established in the CPTE.

Graphs of changes in speed and length of pipes obtained after processing data from one series of measurements.

From figa it is seen that the actual speed of the "rolling" of the pipes, measured using a device for automatically measuring length and speed

the movement of the pipes amounted to 1053-1150 mm / s (the recommended “rolling” speed according to the technological instruction TI 107-SP.TE-35-06 is up to 1667 mm / s). Velocity ripples averaged 0.06-0.09%, in some (rare) cases the speed changed by 0.6%. A sharp change in speed on the graph is associated with a controlled change in the rolling speed of the welder from the operator’s desk.

From Fig.2b it can be seen that the average length of the pipes of the series practically did not change and amounted to ~ 10300 mm. Deviations along the length of the pipes were (±) 40-50 mm (from the average length).

Thus, as a result of using the proposed utility model, the length and speed of the welded pipes in the TPESA 20-76 flow were measured with an error not exceeding 0.3%. Monitoring of the measured parameters allows ultimately to increase the accuracy of measuring the length and speed of the pipes in the TPESA stream, to control the manufacturing process of welded pipes of measured length and ensures the reliability of the device.

The proposed device for automatically measuring the length and speed of pipes is industrially applicable, can be used and adapted to effectively control the operation of TPESA with the operational provision of information to technological personnel and operates in real time.

Claims (1)

A device for automatically measuring the length and speed of movement of pipes, comprising a measuring system made on photosensors and a counting-solving system, characterized in that the counting-solving system contains a signal conversion unit for converting light signals into electrical signals, a comparison unit with a counter, designed for the implementation of the calculation of temporary pulses during movement of the front end of the pipe from the first photodetector to the second, a temporary pulse generator designed for of composing time pulses of the same duration, a speed calculation unit for processing time signals of the distance between the photodetectors by the front end of the pipe and calculating the average pipe speed, a time interval calculation unit for calculating time pulses from the generator and corresponding to the entire pipe passage time past the second photodetector, a unit for calculating the length and outputting results, intended for the calculated determination of the length the cut-off part of the pipe and for displaying the calculation results to the process personnel, while the output of the second photodetector is connected to the first input of the signal conversion unit, the output of the first photodetector is connected to the second input of the signal conversion unit, the output of which is connected to the first input of the comparison unit with a counter, the second input of which is connected with the output of the time pulse generator, and the output of the comparison unit with the counter is connected to the input of the speed calculation unit, and the first input of the time interval calculation unit nor is it connected with the output of the time pulse generator, the second input of the time interval calculation unit is connected to the first output of the speed calculation unit, the second output of the last and the output of the time interval calculation unit are connected, respectively, with the first and second input of the length calculation unit and output of the results.