RU1779804C - Electrohydraulic system - Google Patents

Description

(51) 5 G 01 F 25 / Ofr

STATE PATENT OFFICE OF THE USSR (GOSPATENT of the USSR)

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

1

(21) 4723806/10 (22) 07/26/89 (46) 12/07/92. Bull. Number 45

(71) All-Union Scientific Research Institute of Flow Metering

(72) B.G. Khusainov and M.M. Migranov

(56) Japanese application No. 59-7935, cl. G 01 F25 / 00,1984.

(54) METHOD FOR TESTING FLOAT LEVELS WITH FLEXIBLE MECHANICAL COMMUNICATION

(57) Use: the invention relates to a level measuring technique and can be used for level verification of measures with flexible mechanical connection between floats and a measuring drum, connected

L

. nym with a counter. SUMMARY OF THE INVENTION

flexible mechanical connection 9 from the measuring drum of one calibrated level gauge 4 is completely rewound to the measuring drum of another calibrated level gauge 3, then the index arrow is put on the flexible mechanical connection 9 so that its axis of the line coincides with the pin of the tape measure 6, take readings of both counters 5 and wind flexible mechanical connection 9 from the measuring drum of the level gauge 3 to the measuring drum of the level gauge 4, again take readings from both counters 5. Then rewind in the reverse sequence. 2 ill.

figure 1

4S

The invention relates to measuring equipment, and in particular to methods and means for checking level gauges with flexible mechanical connection between a float and a level gauge.

A known method of checking level gauges with flexible mechanical connection of a sensitive element (float) with a measuring circuit (counter) through a measuring drum by simulating a change in the liquid level up and down, according to which the flexible mechanical connection of the calibrated level gauge, respectively, is wound on and reeled off from it , and by comparing the amount of movement of the flexible mechanical connection with the readings of the counter of the calibrated level gauge, the error of the calibrated level gauge is determined from their difference.

The method is implemented with an exemplary level-dimensional installation simulating a change in the liquid level of the UMPV-2 type, consisting of two main units: simulation and measuring.

The main parts of the level simulation unit are a level gauge tank, which houses the float of a calibrated level gauge, mounted on a hoist connected through a winch to an electric motor. The measuring part of the installation contains a tape measure and reading microscopes. A change in the level recorded by the float relative to the calibrated level gauge located in the upper part of the bench is simulated by raising or lowering the level gauge.

The described method requires complex and large-sized equipment and has low productivity, which is mainly associated with the expenditure of a large amount of time on moving the level gauge and waiting until the surface vibrations in the level gauge due to its vertical movement are completely stopped, and it is possible will begin to count the level. The verification cycle can therefore reach several hours.

The closest in technical essence and the achieved result to the claimed method is the method of level gauges with flexible mechanical connection of the float with a measuring circuit through a measuring drum, in which, as in the previous described method, the liquid level is changed up and down. why flexible mechanical coupling is respectively wound on the measuring drum and wound it from the measuring drum and, comparing the amount of movement of the flexible mechanical coupling with the reading of the counter of the calibrated level gauge, difference determined error power metal emogo

level gauge.

The difference between this method and the known one is only in that the level change is simulated not by raising (lowering) the level gauge in which

0 is a float, and by raising (lowering) the most calibrated level gauge with respect to a fixed level gauge tank.

The stand that implements the method is a rather complicated electronic-mechanical device, including a node for simulating level changes and a measuring circuit. On the support mounted on the bed, there is a screw with which

0 move the slide with the level gauge installed on them. When the handwheel and the handle rotate, the drive moves the slide vertically. A scale is installed on the bed separately from the drive. On the slide

5 installed a height sensor that reads the scale.

The disadvantage of this method is that its implementation requires complex and dimensional calibration equipment, while increasing the limit of the set level, the change of which is simulated, requires a proportional increase in the dimensions of the equipment. In addition, the performance of the method is limited by the fact that a lot of time is spent on settling the liquid in the level gauge after each rise (lowering) of the level gauge, the vibrations of which are transmitted through a flexible

0 mechanical connection of the float located on the surface of the liquid in the level gauge until the level reading is stable on the electronic meter display.

5 An object of the invention is to simplify calibration equipment and increase verification performance.

To this end, in a known method for checking level gauges with flexible mechanical

0 the connection between the float and the measuring drum connected to the counter, by simulating a change up and down, according to which a flexible mechanical connection is respectively wound on a measuring drum

5 and unwound from it, then comparing the amount of movement of the flexible mechanical connection with the readings of the counter of the calibrated level gauge according to the invention, the flexible mechanical connection being wound from the drum of one calibrated level gauge is simultaneously wound onto the measuring drum of another calibrated level gauge, then the operation is repeated reverse sequence.

A comparative analysis of the claimed technical solution with the prototype shows that the claimed method differs from the known one in that a flexible mechanical coupling wound from the drum of one calibrated level gauge is simultaneously wound on the measuring drum of another calibrated level gauge.

Thus, the claimed technical solution meets the criteria of the invention of novelty. The applicant does not have information about identical methods for checking the level gauges and considers that, as a result, the proposed method meets the criteria of the invention with significant differences.

In the drawing: 1 - a schematic diagram of an installation that implements the proposed method; FIG. 2 - the same, top view.

The installation comprises a table 1 with shelves 2 for placement of level gauges 3 and 4 with counters 5, measuring tape of the 2nd or 3rd category 6, reading microscopes 7 and 8, flexible mechanical connection 9 wound on the measuring drum of one of the surfaces gauges and the end mounted on the measuring drum of another verifiable level gauge, and the pointer arrow 10, mounted on a flexible mechanical connection 9. The latter, like the tape of the measuring tape 6, is placed on the horizontal surface of the table 1 parallel to each other in direct close proximity to each other. This ensures normal tension in the measuring tape 6, in addition, a fixed position on the table 1. The boundaries of the measuring section on the tape of the tape 6, for example, 1 m long, are determined using reading microscopes 7 and 8, where they are fixed to the surface table 1 (thus, the distance between the optical axis of the tubes of the microscopes 7 and 8 will be 1 m).

A flexible mechanical link 9 from the measuring drum of one calibrated level gauge, for example with a level gauge 4, is rewound completely onto the measuring drum of another calibrated level gauge, for example a level gauge 3. Then, a light pointing arrow 10 is put on the flexible mechanical link 9 so that it the axis of the line coincided with the stroke of the tape of the roulette 6 intersected by the optical axis of the tube of the reading microscope 7, i.e., with the stroke denoting the zero reference point. On the

This completes the preparation for verification and setup setup.

The calibration of the level gauges 3 and 4 is carried out as follows. The readings of both counters 5 and

then flexible mechanical connection 9 is wound from the measuring drum of the level gauge 3 to the measuring drum of the level gauge 4 until the index arrow 10 is aligned with the stroke

0 tape roulette 6, intersected by the optical axis of the tube of the microscope 8, indicating the boundary of the measuring section. The readings are again taken from both counters 5. The arrow 10 is taken and set again in the described manner5 to the reference point, after which the flexible mechanical connection 9 is again rewound from level gauge 3 to level gauge 4 and again readings are taken from counters 5 of both levels0 nemerov and so on to the lower limit of measurements on the level gauge 3 and to the upper limit of measurements on the level gauge 4. In this case, the level measurement is simulated: for the level gauge 3 - lowering the level, and for

5 level gauge 4 - its increase. Then, the calibration of the level gauges is continued in a similar way, rewinding the flexible mechanical connection 9 in the reverse order: from the level gauge 4 to

0 level gauge 3. The role of the reference microscopes 7 and 8 changes in this case: the reference point is determined by the microscope 8, and the end by the microscope 7. Take readings of counters 5 of both level gauges and so on to the top

5 of the measurement limit on the level gauge 3 and to the upper limit of measurements on the level gauge 4.

The error of the calibrated level gauges is determined as follows

0AH Hi-LCOnst,

where H is the level value on the level meter counter;

Lconst is the distance between reading microscopes.

5 In this way, level gauges can

be verified both in the entire measurement range and in its individual parts.

The proposed method made it possible to use significantly less complicated verification equipment, in particular, it concerns the level change simulation unit, the performance of which is reduced to two dimensional drums kinematically connected by a flexible mechanical connection. Because the

5, the method makes it possible to exclude the use of the level gauge, moving it relative to the level gauge or moving the latter relative to the level gauge and the associated loss of time for endurance of the meter readings, the verification productivity increases several tens of times.

The advantage of the proposed method for checking the level gauges is especially evident in the possibility of checking the level gauges of any measurement limits without increasing the dimensions of the calibration equipment and its complication.

Claims (1)

SUMMARY OF THE INVENTION A method for checking float level gauges with flexible mechanical connection, which consists in the fact that after installing the first calibrated level gauge, they simulate a level change by winding and reeling flexible mechanical connection, at the same time measure its value YU 0 5 displacements, compare this value with the readings of the counter of the calibrated level gauge and determine the error by their difference, characterized in that, in order to increase the calibration performance, a second calibrated level gauge is installed next to the first, a flexible mechanical connection is wound around the first level gauge measuring drum of the second calibrated level gauge, the operation is repeated in the reverse order, comparing the amount of movement of the flexible mechanical connection of the first calibrated level gauge with the readings of the counter of the second of the calibrated level gauge, the error of the second calibrated level gauge is determined. 9 FIG 2