SU812366A1 - Apparatus for monitoring tube wall width difference - Google Patents

Description

(54) DEVICE FOR DIVERSITY CONTROL.

PIPES

The invention relates to measurement instrumentation and can be used to assess the quality of a pipe and control its production processes on hot rolled tube rolling machines with reduction or calibration stanzions. And, a device for determining the thickness of a wall thickness is known, including a sensor of average wall thickness along the length of the pipe and an oscilloscope for register the nature of the change in the mean. wall thickness 11. However, this device does not allow obtaining operational information about the longitudinal difference of pipes in the process of their manufacture to control the process network. The purpose of the invention is to continuously monitor and adjust the longitudinal difference in the process of manufacturing pipes or their parts, which will allow evaluate the quality of the pipes and control their fabrication process to stabilize the average wall thickness along the length of the pipes and maintain the average value of the wall thickness in the field of minus tolerances. This goal achieves that t & l, that the meter containing the sensor measuring the average thickness of the pipe wall is additionally equipped with a pipe length sensor; a control unit, a software unit, a pulse counting circuit, a computing unit for varying wall thickness, a full unit and a display unit, the first input of the control unit connected to the output of the sensor measuring the average wall thickness of the pipe, the second and third, the inputs of this unit pipe and the first output of the pulse counting circuit; the first output of the control unit is connected to the input of the program block, and the second and third outputs of this block are connected to the second and third The re- tain inputs of the delta-phase calculus, the second output of the control unit is also connected to the second input of the block, the output of the program block is connected to the input of the resolution circuit of the card. That is, the second output is connected to the first input of the differential-wall computing unit, and the output of this block is connected to the nepBbtM input of the storage unit, the output of which is connected to the input of the indicator block and the input of the process control system.

The block (Control consists of a block forming unit, a pulse counter control circuit and a pulse meter of a length meter connected in series, as well as voltage-frequency conversion; the first input of which is the first input of the control unit combined with the input of the forming unit, the second input the third input of the control unit , and the output is the third output of the control unit, the gathering circuit, the input of which is combined with the first input of the pulse counter control circuit, and the first output is connected to the BTOjaJM input of the counter control circuit pulse, the second output reset circuit coupled to the input pulse counter meter length is a second output of the control unit, the second input of the driving unit is .NIN third input pulse counter control circuit, and the first output - pulse counter output meter length.

The difference-thickness computing unit consists of an iftix reversible counter control unit in series, the first input of which is the first input of the difference-thickness calculating unit, and the second input is the third input of the difference-thickness calculating unit, the reversible counter and output circuit, whose output is the equalizer calculation and clock generator and a delaying unit, the first input of the delaying unit being combined with the second input of the reversible counter and being the second input of the difference calculating unit The second input is connected to the second output of the control unit by the reversible counter, the output of the delaying unit is connected to the second input of the output circuit, the third input is connected to the output of the clock generator.

FIG. 1 shows a block diagram of the device; in fig. 2 - forming unit; in fig. 3 is a diagram of the reset of G in FIG. 4 is a control circuit of a pulse counter of the length meter in FIG. 5 shows a program block / in FIG. 6 - block delay.

The device comprises a sensor 1 of an average pipe wall thickness and a sensor 2 of a pipe length, a control block 3, a software block 4, a pulse count resolution circuit 5, a subtraction block, a thin-wall thickness unit, a reserved block 7, and an indication block 8.

The control unit 3 includes a voltage-frequency converter 9, which forms the unit 10, a pulse counter control circuit 11, a tube length meter, and a circuit 12

Sa and counter 13 pulses meter length.

The difference-thickness calculation unit 6 includes a reversible counter control circuit 14, a delay block

15, a reversible counter 16, an output circuit 17, and a clock pulse generator 18.

Formations of block 10 consists of Schmidt trigger 19, differentiation block 20, diodes 21 and 22, and NAND circuit 23.

Circuit 12 reset includes an amplifier and circuit 24 AND-NOT. The pulse-meter meter 11 control circuit of the Pipe Length consists of the trigger 25 and the IS-26 circuit 26.

Program block 4 includes, switches 27-30 and schemes 31-34 AND-NOT.

The delaying unit 15 includes a counter 25, a decoder 36, a switch 37, AND-NOT circuits 38 and triggers 39.

The device works as follows.

When the pipe passes through, the sensor 1 of the meter measuring the average wall thickness in each section along the length of the pipe, an analog signal characterizing the average wall thickness in each section along the length of the pipe, goes to control unit 3 on the converter

9 voltage and frequency to the forming unit 10 (Fig. 2). This signal

With the help of a forming unit 10, it is converted into a pulse, the duration of which depends on the time the pipe is in the zone of action of the wall thickness sensor 1 and determines the operating time of the system on one pipe. The leading edge of this pulse and the formation of block 10 through the pulse counter control circuit 11 measures the tube length meter (Fig. 4) includes a length counter 13, which receives impulses indirectly characterizing the tube length from the pulse tube 2 sensor. The back edge of the pulse from the forming unit

10 through the reset circuit 12 (FIG. 3), the counter of 13 pulses of the tube length meter is zeroed, the reversible counter

16, the storage unit 7, is reset, the pulse meter control circuit 11, the tube length meter and the trigger block trigger 15 (Fig. 6).

The longitudinal difference of pipes or certain sections of them, the front and rear ends, or the front end and middle part of the pipe, or some other section, which are specified by software block 4 (FIG. 5), are determined by the difference in average wall thickness at the ends of the specified sections.

Claims (3)

The pulses from the counter 13 pulses of the length meter arrive at the program block 4 (Fig. 5), from which counting commands are received on a given pipe section through the pulse counting circuits 5 in the control block 3, the voltage-frequency converter 9 to turn it on and in block, b, the calculation of the longitudinal delta scale to the reversible counter control circuit 14. Depending on the program programmed, the pulses from the converter: 9 through 14 controls of the reversible counter enter the reversible counter 16 first on the addition buses, and then on the subtraction buses. The difference in wall thicknesses of specified pipe sections in the reversible counter 16 through the output circuit 17, by command from the reversible counter control circuit 14 through the delay device 15, is read at the frequency specified by the clock pulse generator 18 and a signal is stored in the storage unit 7. characterizing the longitudinal raznesennosti pipe or its sections, issued on the one hand to the indicator 8 of the varicolocation and on the other hand this signal is fed to the process control system for its p adjustment. Thus, the use of the proposed device will allow the determination of the longitudinal spacing of pipes or their sections in the production process on hot rolling units. This makes it possible to assess the quality of the pipes and control the technological process in order to reduce the longitudinal fracture of the pipes and maintain the average value of their average wall thickness within the specified limits. . Apparatus of the invention 1. A device for monitoring the thickness of a pipe, comprising a sensor for measuring the average wall thickness of the pipe, so that, in order to monitor and control the difference in length over the length of the pipes during their manufacture, for example, during hot rolling, In addition, a tube length sensor, a control unit, a program block, a pulse count resolution circuit, is included. a difference calculation unit, a storage unit and an indication unit, the first input of the control unit connected to the output of the sensor measuring the average thickness of the pipe wall, the second and third input of this unit connected to the outputs of the length sensor; and the first output of the pulse counting resolution circuit, the first output of the control unit is connected to the input of the program block, and the second and third outputs of this block are connected to the second and third inputs of the difference computing unit, respectively, and the second output of the control unit is also connected to the second input of the storage unit, the output of the program block is connected to the input of the counting resolution scheme, the second output is connected to the first input of the block, the number of differences is, and the output of this block is connected to the first input of the storage block Whose output is coupled to the input display unit and an input variation in a control system of pipes. 2. A device according to claim 1, characterized in that the control unit consists of a forging unit. pulse counter and pulse meter control circuits of a length meter connected in series, as well as a frequency converter, the first input of which is the first input of the control unit combined with the input of the forming unit, the second input is the third input of the control unit, and the output is the third output of the control unit , the reset circuit, the input of which is combined with the first input of the pulse counter control circuit, and the first output connected to the second control input of the pulse counter, the second output of the reset circuit is connected to the second input m pulse counter meter length and is the second output of the control unit, the second input of the control unit is the third input of the pulse counter control circuit, and the first output of the pulse counter output meter length. 3. The device according to paragraphs. 1 and 2, characterized in that the power difference calculating unit consists of a reversible counter control unit connected in series, the first input of which is the first input of the wall thickness calculating unit, and the second input is the third input of the wall computing panel, reverse counter, and output circuit, the output of which is the output of the efficiency calculation unit, and also the clock generator and the delay unit; the first input of the delay unit is combined with the second input of the reversible counter and. is the second input of the differential-phase computing unit, and the second input is connected to the second output of the reversible control unit counter, the output of the delayed-colored unit is connected to the second input of the output circuit, the third input of which is connected to the output of the clock generator. Sources of information taken into account in the examination 1. Pipe processing processes. Metallurgists, 1977, No. 2, p.90-94. f5 Kf / l.t1 and 23 21 Phase.2 KSa.ll five I / Om & i.fe KS / I.11.} 3.1 &, I6.7