SU1260669A1 - Device for measuring and checking displacement of reversing ferromagnetic articles - Google Patents

Abstract

This invention relates to the field of field geophysics. The purpose of the invention is to improve the accuracy and the expansion of the speed range of measurements by introducing calculated corrections for the speed of movement of the product. In order to achieve a positive effect, the device is equipped with a calibration block containing a speed measurement circuit, speed switches and directions of movement and a product pulling mechanism, a readout block containing a match circuit and a set register, two distributors, two registers of time intervals between tags, two registers of speed codes of movement, two registers of codes of constant time of a chain of transfer of a label, two registers of codes of the initial base of measurements, a pulse generator, shaper time interval, computational unit with, control and wiring circuits, and a pair of programs; In calibration mode, the marking system is placed in the calibration block. The speed switch is used to set the speed in one interval of the speed range. The movement speed of the product is measured by a speed measurement circuit. The time interval ut is defined by the time interval generator, which is filled with pulses from the generator. The speed value V is recorded in the speed register. In parallel with the registration of V, t is calculated in the code register of intervals between labels and zeroed again. To take readings t, and V, serves as a reading unit, then these readings are transmitted to the processing unit for processing. The signal from the speed switch is used to record the values of t and V and their readings are also transmitted to the computing unit, where it is calculated, with the correction of the speed of movement of the object. 3 1-w. with (/) Yu and O O) Od QD

Description

f

The invention relates to field geophysics, in particular, to measurements of moving parts of a drawworks when conducting geophysical surveys of wells during the drilling process, necessary for linking the results of studies to the depth of the wells.

The purpose of the invention is to improve the accuracy and expand the speed measurement range by introducing calculated corrections to the product moving speed, for which the label transfer time constant and the initial value of the measurement base are predetermined, and then, based on the fixed time interval between the arrival of consecutive marks, correction for the derived formula using a calculator.

Figure 1 shows a graph of the length of the measuring base on the speed of the product; Fig. 2 is a graph of the dependence of the time interval between label pulses on the speed of movement of the product; FIG. 3 is a block diagram of the device.

The device contains a marking installation 1, consisting of a labeling element 2 and two playback elements 3, a reversible counter 4, a calibration block 5 consisting of a mechanism 6 of moving the product with speed switches 7 and 8 and a direction of movement and from diagram 9 speed measurements, separation circuits 10, 11, and 12, distributors 13 and 14, registers 15 and 16 of time interval codes between marks, registers 17 and 18 of motion speed codes, registers 19 and 20 of time constant codes of the transfer chain of the label, registers 21 and 22 initial code base rhenium, stuffing pulse generator 23, generator 24 timeslots computational unit 25 with the control circuits 26 and 27, interface 28 and memory program unit 29 detachably readings comprising the coincidence circuit 30 and the register 31 setpoints. In the process of monitoring by the measurement recorder 32, consisting of the result recorder 33 and the indicator 34, a magnetic mark is applied to it by the element 2.

2606692

When the product is moving, depending on the direction, this mark is read by one of the playback elements 3. Then, the read mark is again placed on the product and fixed in the counter 4. Thus, the successive transfer of the mark from the location of the playback element 3 to the location of the application element 2 is carried out.

The distance between the marking area and the reading area forms a dimensional base h. Since during the transfer of the label from element 3 to moment 2, due to the constant time D of the chain, the product will move, depending on the chain

15

20

radiya for the length of the dimensional base h em type

h h.

(one)

Where

H is the initial value of the dimensional base (at V 0).

thirty

35

In Fig. 1a, it shows that as the speed increases, h grows proportionally and the neglect of this growth leads to an increase in measurement error (shaded area of the graph). The values that are most simply and accurately obtained during the repeated measurements are not the speed itself, but the reverse the values are the time between two successive t marks. Therefore, we transform (1) to the form;

t b b

V v

+ C

(2) The graph of this dependence is given in FIG. 16. It has an asymptote parallel to the V axis for t t, i.e. at.

45

From the expression (2) we have

V

ho -С

(3)

50

Substituting (3) in (1) we get

/ ii

 -t

(four)

55

To determine h, you must first have the values of n and then for each value of t, count the numbers h. .

At the same time, the total amount of rope movement is defined as

n i: (h;) - (h.),

 j. J

(five)

(h)

(h) - the current value of the dimensional base when moving in one direction, for example upwards ;.

- the current value of the dimensional base when moving in the other direction, for example downwards;

p and k - respectively. the number of labels captured by playback elements 2 and 3,

To determine h and Γ, reversible to expression (2) and construct system equations

. . 7f

.

Having solved system (6) with respect to h t, we get

t h P

(12)

t.- t.

- “Yi.

ho

V, 2 t,

TT

V, V,

It follows that it suffices to take two readings v, and v and the corresponding values of t, and t for this particular instance of the marking installation, to get the values of hg and C. V | to v it is advisable to choose, at the beginning and end of the real range of measurement speeds.

In the limiting case, if we set h and S u with some admissible values, which by any preconditions, for example, technical instructions, meet the required accuracy of displacement measurements, then from (1)

(6) The device operates as follows.

The device has two main modes of operation - calibration and measurement. The calibration process determines the initial values of the measuring bases.

30 and the time constant of the transfer chain

tags when moving in one direction. (ho, o) and in the opposite direction (h,). These values are not the same due to the use to indicate movement when

35 reverse two elements 3, the characteristics of which cannot be absolutely identical, as well as not strict symmetry of these elements relative to the magnetic field applied to the product

40 tags.

In the calibration mode, the marking unit 7 is placed in the calibration unit 5.

(7)

(eight)

45 Through the element, 2 markings, the product is passed from the pulling mechanism 6. Speed switch 7 sets the speed of the draw speed in one interval of 50 at speeds. The pulling mechanism 6 can be made in the form of a system of rollers driven by an electric motor in another way; speed control can be performed by: Sh h Sh h vcT, v from (2)

T

 , + c

hi

V

 / "Ato

ho ft

 The expression (9) means that at the speeds v of the cells, the measured value h from the expression (1) can be taken as hp with an acceptable accuracy.

The expression (10) means that when, the measured value of t from expression (2) can be taken as t with an acceptable accuracy.

For a further increase in accurately measuring movement measurements, an accumulation method can be used, i.e. from (1) h can be obtained as a result of measuring a certain length L nh and then averaging

15

h t о п

(ten

20

Similarly, from (2) t can be

received as

t h P

(12)

45 Through the element, 2 markings, the product is passed from the pulling mechanism 6. Speed switch 7 sets the speed of the draw speed in one interval of 50 at speeds. The pulling mechanism 6 can be made in the form of a system of rollers driven by an electric motor in another way, the speed control can be performed by a mechanical switch or an electric one. The speed of movement of the product is measured by scheme 9. A coding disk with holes (or other marks) is put on the shaft of one of the rollers of the mechanism 6. The number of pulses proportional to the speed of movement is read by the photo-method. If you select a fixed time interval, then the target speed

.. Ny V K ,. (13)

Here N is the number of pulses read in time it; K - coefficient taking into account the size of the coding disk, gear ratio, hole placement, etc.

The time interval it is defined by the shaper 24 time intervals, to the input of which the filling pulses of a fixed frequency f from the oscillator 23 are fed. The shaper 2h is designed as a counter with a specific recalculation factor K

it K

(14)

The speed value v is recorded in the speed register 17, where the output of the circuit 30 is connected through the distributor 14

K, Nvif

   IT IN.

to

to.

(15)

In parallel with the registration of Vj in the register 15 of the interval codes between the marks, to which the playback elements 3 are connected through the distributor 13 and the separation circuit 10 and 11, the number tj is counted as follows. From the generator 23, the filling pulses arrive at the counting input of the register 15, and the signals from the element 3, posting to the installation input of this register, clear it, i.e., in the register 15 the codes of the desired value are recruited and reset.

1 f

t, n

(sixteen)

where K. - the code in register 15 (shsh 16).

Now it is necessary to take readings (;, and Vj. Block 29 serves for this purpose, in the register 31 of the settings of which the sequence number of the codes is entered (t ,, v,).

five

0

five

0

five

which will then be passed to processing. This number may be selected for reasons of steady state mode.

In BpeNm, the reading of tags by elements 3 in counter A accumulates the code of the sequence number of the read tags and, if it is equal to the one specified in register 31, coincidence circuit 30 is triggered, giving a signal of the moment of readings to control circuit 26, which, through circuit 27, carries codes from blocks 15 (t,) and 17 (V |) in the memory of the computing unit 25. Similarly, the switch 7 sets the second speed value from the opposite interval of the speed range. According to the signal from the switch 7, the valves 13 and 14 are connected to register the values of t and the registers .16 and 18, and their readings are also transmitted to the block 15.

Upon receipt of the codes t ,, t, V,, Vj, block 25 calculates the values of hj and G according to the formulas (7) and (8) taking into account (15) and (16)

„, B--

 ° f SZT:

IT

(17)

,; .. tl s..s.t.i .. (, 8)

(lJ. K

. K ,, N, / N, v

Then, the switch 8 changes the direction of movement of the product and is calculated according to the principle outlined above, the value and. The obtained values of c, c, h, are recorded in registers 19-22. Similarly, the values of T and h can be obtained from expressions (9) and (10), however, in this case, the values of the velocities during calibration are imposed more stringent restrictions. This completes the calibration process.

 During the measurement, marking system 1 is installed directly on the measurement object. One of the registers 15 (or 16), the separation circuit 12, the generator 23, the registers 19-22, the circuits 26 and 27, the block 25 and the measurement recorder 32 are functioning.

.7

The principle of operation in this mode is that the register 15 records successively the codes of the time values between the incoming tags from the elements 3, the signal of each label from the element 3 through the separation circuit 12 enters the circuit. Mu 26 governed. Computing unit 25 for each command from the control circuit 26 performs the calculation by the formula (A), and then by the formula (5).

The initial data for the calculation are received through the junction circuit 27 from the registers 15 (t), 19 (T), 20 (s), 21 (h)., 22 (b;).

Programs for calculating by formulas (4), (5), (17) and (18) are stored in the memory 28 of programs of block 25. The results of the calculations are written

the recorder 32 measurements.

I

Claims (1)

Invention Formula A device for measuring and controlling the movement of reversal-moving-25 between labels, second braid inputs for ferromagnetic products, containing a marking unit consisting of a magnetic labeling element and two playback elements, a reversible counter, inputs connected to two playback elements, a measurement recorder , characterized in that, in order to increase accuracy and expand the speed range of measurements, it is equipped with a calibration unit containing a speed measurement circuit, speed switches the movement and direction of movement and the mechanism of drawing the product, the Q output connected to the input of the speed measurement circuit, the first input to the speed switch, and the second input to the movement direction switch} 1И, the pick-off unit containing 45 register / The first and second inputs of the first distributor are connected to the outputs of the respective separation circuits, and the third input is connected to the output of the speed switch and to the first input of the second distribution circuit, the second input of which is connected to the output of the speed measuring circuit, a computing unit with circuits control and interface and program memory, the outputs of these registers and the first output of the control circuit are connected to the corresponding inputs of the interface circuit, the output of which is connected to the input of the the result hystera, the first input of the control circuit is connected to the output of the third separation circuit, the second input is connected to the output of the reading unit, and the second output is connected to the first input of the program memory. t 1260669 .8 the setpoints, the output connected to the first input of the coincidence circuit, the second input of which is connected to the output of the reversible counter by three separation circuits, the first and second inputs of which are connected respectively to the first and second inputs of the reversing counter, two distributors, two registers of interval codes time between tags, two registers of movement speed codes, two registers of time constant codes of a transfer chain of a label, two registers of initial measurement base codes, a pulse generator, a time interval generator, whose input is connected to the first output of the pulse generator, and the output is from the first inputs No. 1 code registers movement speeds, the second inputs of which are connected to the outputs of the second distributor, the second output of the pulse generator - with the first inputs of time interval codes between tags, the second inputs of which are connected to the outputs of the first distributor, the first and second inputs of the first distributor, and the third input is with the output of the speed switch and with the first input of the second distribution scheme, the second input of which is connected to the output of the speed measurement circuit, by computing computations com with the control circuits and interfaces and program memory, the outputs of said registers and the first output of the control circuit are connected to the corresponding inputs of the interface circuit whose output is connected to the input of the result register, the first input of the control circuit is connected to the output of the third separation circuit, the second input is with the output of the reading unit, and the second output with the first input of the program memory. and fho lo 6t g fi.G (pus. 2 fj A. L g-, l | h gh hi. XX X four Ij i / k 74 j Editor A.Dolinich Compiled by L. Kryukova Tehred L.Oleynik Proofreader About "Lugova Order 5214/36 Circulation 670 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4