KR20010110877A - device for correcting pressure gauge - Google Patents

Abstract

The present invention relates to an apparatus for automatically calibrating various deadweight testers used in steel mills, and more particularly, a calibration device for deadweight testers that can quickly and accurately calibrate a large number of pressure gauges of various types using a laser and a computer. It is about.

The present invention has a base plate 102 in which pressure gauges 1a, 1b, 1c, and 3 are disposed on an upper surface thereof, and the pressure gauges 1a, 1b, 1c, and 3 are connected to a connection pipe 106. Base unit 100 equipped with a pressure pump 104 connected via); The pressure gauge 1a is provided with a first laser sensor 202a installed on the base plate 102 so as to be movable up, down, left and right, and a second laser sensor 202b disposed corresponding to the standard deadweight tester 3. A measuring unit 200 for measuring the falling speed of the weights 5a, 5b, 5c and 10 of the 1b, 1c and 3; And pressurization toward the pressure gauges 1a, 1b, 1c and 3, and movement of the first and second laser sensors 202a and 202b, and the first and second laser sensors 202a and 202b. And a control unit 300 having a computer 301 for calculating a result of the measurement.

Description

Device for correcting pressure gauge

The present invention relates to an apparatus for automatically calibrating various deadweight testers used in steel mills, and more particularly, a calibration device for deadweight testers that can quickly and accurately calibrate a large number of pressure gauges of various types using a laser and a computer. It is about.

In general, the deadweight tester is used to check the degree of zero point adjustment and status of analog pressure gauges and digital pressure transmitters (hereinafter referred to as pressure gauges), which are installed in each element of steelmaking facilities. In steel mills, as pressure gauges are installed in necessary places, deadweight pressure gauges are also equipped, and the range of application is different.

1 is a longitudinal sectional view showing a general deadweight tester 1, the basic operation principle is as follows. That is, when a plurality of weights 5 having a correct mass value are placed on the piston 5a, the force generated by these weights acts on one end of the piston 5a and the pressure handle 7 on the other end. The force by the pressure of the fluid caused by) is applied. At this time, when the two forces are in equilibrium with each other and the piston (5a) is in a state of floating somewhat while rotating in the cylinder (1a), the pressure corresponding to the weight (5) and the connection to the deadweight pressure gauge (1) If the pressure dimensions indicated by the pressure gauge 2 connected as (6) are the same, it is judged as pass and the pressure gauge 2 is used as it is.

On the other hand, the standard deadweight tester (3) is used to remove the measurement deviation of the deadweight tester (1), each of which has a different range of use, and because the standard grade of the degree of accuracy is very high, the standard deadweight tester The standard calibration procedure is to compare and calibrate same pressure gauges.

That is, the conventional calibration method of the deadweight tester had the following problems.

According to the standard procedure for measuring deadweight testers issued by specialized research institutes, the pressure difference between the standard deadweight tester (3) and the deadweight tester (1) is determined by the falling speed of the weight (5) and the standard weight (10). .

Accordingly, the method of measuring the falling speed of the weights 5 and 10 known so far communicates with the standard deadweight tester 3 and the deadweight tester 1 to be calibrated through the piping member 9, respectively. In the state where the pressure is applied to the pressure gauges 1 and 3 as the connected manual pressure pump 4, the operator lifts the weights 5 and 10 which have been raised for a predetermined time, not shown in the drawing. Detecting the falling speed on the neck side using a herbivore system, and by raising or lowering the compensation weight (8) on the standard weight (10) to equal the falling speed to each other, by calculating the weight of the compensation weight (8) The compensation value according to the error of the deadweight tester 1 compared to the standard deadweight tester 3 is calculated.

In this case, there is a problem in that the fall rate is measured according to the time also differs from person to person as a result.

In addition, the standard deadweight tester 3 and the deadweight tester 1 are compared in a 1: 1 manner to calculate and compensate for the deviation value. When the quantity of the deadweight tester 1 to be calibrated is large, the above calibration is performed. The work efficiency is remarkably low because the work must be performed manually, and theoretically, the measurement reliability can be secured only by measuring 3 to 10 times of the entire span, but in the section where a large number of deadweight testers (1) are calibrated in a limited time, 1 In the case of measuring only two to two times, there is a problem that disturbance occurs when the control of the on-site process is affected by affecting the accuracy of the pressure gauge 2.

Accordingly, the present invention has been made in view of such a conventional problem, the object of which is to automatically perform a calibration operation in comparison with a standard deadweight tester under the control of a computer with a plurality of deadweight testers installed, The purpose of this study is to provide a calibration device for a deadweight tester that can accurately measure the dropping distance of a weight with a laser and calculate the dropping speed and correction values by a program to improve the accuracy and work efficiency.

1 is a longitudinal sectional view showing a deadweight tester according to the prior art,

Figure 2 is a state diagram showing the operation of calibrating a deadweight tester according to the prior art,

3 is a plan view showing a calibration device for a deadweight tester according to the present invention,

4 is a side view as seen from A-B of FIG.

Figure 5 is a graph showing the results measured in the calibration device of the deadweight tester according to the present invention.

* Explanation of symbols for the main parts of the drawings *

1a, 1b, 1c ... Deadweight testers 3 ..... Standard deadweight testers

104 ..... Pressurized pump 106 ..... Connection piping

202a, 202b ... first and second laser sensors 206a, 206b ... support shaft

208a, 208b ... Shanghai Song Screw 210a, 210b ... Shanghai Song Motor

216 ..... Rails 218 ..... Mobile

224 ..... left and right feed motor 301 .... Computer

As a technical configuration for achieving the above object, the present invention,

A device for calibrating a plurality of deadweight testers based on a standard deadweight tester,

A base unit having a base plate on which the pressure gauges are disposed, and a pressure pump connected to the pressure gauges via a connection pipe;

A measuring unit for measuring a falling speed of weights of the pressure gauges having a first laser sensor installed on the base plate to move in a vertical direction and a second laser sensor disposed corresponding to the standard deadweight tester; And

And a control unit having a computer for controlling the pressurization to the pressure measurement and the movement of the first and second laser sensors and calculating the measurement results of the first and second laser sensors. By providing a device.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 is a plan view showing a calibration device for a deadweight tester according to the present invention, Figure 4 is a side view showing a calibration device for a deadweight tester according to the present invention, the device 20 of the present invention is one standard Based on the deadweight tester 3, a plurality of deadweight testers 1 can be easily, quickly and precisely calibrated. Such a device 20 includes a base part 100, a measuring part 200 and It consists of a control unit 300.

That is, the base unit 100 has a base plate 102 formed to a size that can sufficiently accommodate each of the components described later, a plurality of deadweight pressure gauge (1a) to be corrected on the base plate 102 (1b) and (1c) are arranged at equal intervals, and a standard deadweight tester 3 is arranged at a position adjacent to them.

The pressure gauges 1a, 1b, 1c, and 3 are respectively connected to the pressure pump 104 via a connection pipe 106, and the pressure gauges 1a and 1b are connected to the connection pipe 106. Automatic valves 108a, 108b, 108c and 108d are respectively installed so as to manually or electrically control the pressure transmitted to the 1c and 3 sides, and these are remotely controlled by a computer 301 to be described later. do.

In addition, the measuring unit 200 for measuring the falling speed of each weight (5a) (5b) (5c) (10) mounted on the pressure gauge (1a) (1b) (1c) (3) is the base plate 102 The first laser sensor 202a, which is installed so as to be movable up, down, left and right, and can be selectively arranged to correspond to the deadweight tester 1a, 1b, 1c to be measured. Correspondingly arranged with the pressure gauge 3, the 2nd laser sensor 202b which can be moved is comprised.

Here, the measuring unit 200 is a rail 216 arranged in parallel with the arrangement width of the deadweight type pressure gauge (1a) (1b) (1c), and the movable table 218 slidably assembled therewith, The first and second laser sensors 202a are installed to be shanghai along the guide surface of the support shaft 206a installed vertically between the upper and lower fixing plates 212a and 214a and the rotating lead of the shanghai song screw 208a. Mounted sensor fixing station 204a and the shanghai pine screw 208 are rotated forward and reverse to the forward and reverse ports so as to change the vertical position of the sensor anchor 204a and the movable station 218. And a guide surface of the support shaft 206b vertically installed between the upper and lower fixing plates 212a and 212b, having a first transfer means 220a composed of a motor 224 for moving left and right in a horizontal direction. It is installed to be shanghai along the rotational lead of the screw 208b, and the second laser sensor 202b is installed. A second transfer means (220b) composed of a sensor fixing station (204b) to be attached and a shanghai conveying motor (210b) for rotating the shanghai screw (208b).

The left and right transfer motor 224 is a belt pulley 22 assembled with a time belt 222a connected to one side of the lower fixing plate 214a of the movable table 218 to precisely control the position of the movable table 218. ), And configure.

On the other hand, the control unit 300 controls the pressure to the pressure gauge (1a) (1b) (1c) (3) and the movement of the first and second laser sensors (202a, 202b), the first and second The computer 301 is configured to calculate the measurement results of the laser sensors 202a and 202b. The computer 301 is an automatic valve 108a and 108b that opens and closes the flow path of the connection pipe 106. (108c) and 108d are electrically connected to each other, and are connected to control the driving of the Shanghai transport motors 210a and 210b and the left and right transport motors 224, and the first and second laser sensors 202a and 202b. It is configured to connect with them to receive the measured result.

The operation and effects of the present invention as described above will be described.

A plurality of pressure gauges 1a to be calibrated on the base plate 102, which is composed of a standard deadweight tester 3, a first laser sensor 202a capable of vertical movement, and a second laser sensor 202b capable of moving up and down. (1b) and (1c) at regular intervals within a range not exceeding the length of the rail 216, and then the respective branch pipes of the connection pipe 106 extending from the pressure pump 104 are installed at each pressure gauge 1a ( 1b) (1c) (3) is assembled to the connector 6 and prepared for calibration.

Then, power on the computer 301 prepared in advance, and input useful information such as the measurement conditions, the number of measurements and the type of deadweight tester (1a) (1b) (1c) to be calibrated on the program. When the measurement command is instructed, the pressure pump 104 is operated, and the selected valve and the standard component of the plurality of automatic valves 108a, 108b and 108c associated with the deadweight testers 1a, 1b and 1c are operated. As the automatic valve 108d associated with the dynamic pressure gauge 3 is opened, pressure is applied to the selected pressure gauge 1b and 3 so that the weight 5b and the standard weight 10 float.

At this time, the opening of the automatic valves 108a, 108b, 108c is selectively varied according to the pressure gauges 1a, 1b, 1c corresponding to the first laser sensor 202a, and the first laser sensor ( The opening and closing of the 202a and the automatic valves 108a (108b) and 108c may be performed sequentially.

In addition, by operating each of the Shanghai transport motors 210a and 210b by the program of the computer 301, the first laser sensor horizontally transported to correspond one-to-one with the selected pressure gauge 1b to be corrected by the left and right transport motors ( 202a and the second laser sensor 202b corresponding to the standard deadweight tester 3 are equally moved from the upper surface of the weights 5b and 10 to a vertical position.

In this state, when the automatic valve 108b selected by the program of the computer 301 is shut off, when the pressure gauge 1b has a problem, the weight 5b and the standard weight 10 fall at different speeds, respectively. In this case, the first and second laser sensors 202a and 20b respectively measure speeds that are falling distances with time variation, and the measured results may appear as shown in FIG. 5, and the measured values Is transmitted to the computer 301 side to automatically calculate the pressure correction value due to the drop speed difference to provide information quickly and accurately.

The measurement process as described above is repeated by the quantity and repeat measurement times of the deadweight tester (1a) (1b) (1c) set by the operator to minimize the error value and documented by measuring date, measurement time, measurement object can do.

On the other hand, after completing the above-described correction operation on the basis of the standard deadweight pressure gauge (3) with one deadweight pressure gauge (1b), the motor 224 for the left and right transfer by driving the programmed computer (301) The movable table 218 on the rail 216 is horizontally moved to correspond to another deadweight tester 1c, and then the pressure is simultaneously transmitted to the deadweight tester 1c and the standard deadweight tester 3, respectively. The falling speed of the weight 5c and the standard weight 10 is measured and compared, and the above calibration operation is repeated.

According to the present invention having the above-described configuration, the drop distance of the weight by repeatedly performing the automatic calibration operation under the control of the computer with a plurality of deadweight testers and standard deadweight testers installed on the base plate It is possible to maximize the efficiency of the measurement work by accurately measuring the accuracy as a laser sensor, calculating the fall speed and the correction value by a program, and to obtain the correct correction value as well as the data to the correction value.

The above description is merely illustrative of the preferred embodiment according to the present invention, the present invention is not limited thereto, and those skilled in the art to which the present invention belongs, Various modifications are possible without departing from the scope.

Claims (3)

In the apparatus for calibrating a plurality of deadweight testers (1a) (1b) (1c) on the basis of a standard deadweight tester (3), The pressure gauge (1a) (1b) (1c) (3) having a base plate 102 is disposed on the upper surface, and the pressure gauge (1a) (1b) (1c) (3) and connecting pipe 106 A base unit 100 equipped with a pressure pump 104 connected by a medium; The pressure gauge 1a is provided with a first laser sensor 202a installed on the base plate 102 so as to be movable up, down, left and right, and a second laser sensor 202b disposed corresponding to the standard deadweight tester 3. A measuring unit 200 for measuring the falling speeds of the weights 5a, 5b, 5c and 10 of the 1b, 1c and 3; And Pressurization toward the pressure gauges 1a, 1b, 1c, and 3 and movement of the first and second laser sensors 202a and 202b are controlled, and the first and second laser sensors 202a and 202b are controlled. And a control unit (300) having a computer (301) for calculating a measurement result of a deadweight type pressure gauge. The method of claim 1, The measuring unit 200 is perpendicular to the rail 216 disposed parallel to the arrangement width of the deadweight testers 1a, 1b and 1c, and the movable table 218 slidably assembled thereto. A sensor fixing stand 204a installed to be capable of shanghai conveying along the support shaft 206a and the shanghai song screw 208a installed thereon and equipped with a first laser sensor 202a, and the shanghai song screw 208 A first conveying means 220a constituted by a shanghai transport motor 210a for rotating in a term, and a left and right transport motor 224 for sliding the movable table 218 in left and right directions, and the upper and lower fixing plates 212a. 2) a sensor shaft 204b installed vertically between the support shaft 206b and the shanghai song screw 208b so that the second laser sensor 202b can be mounted thereon; It has a second conveying means 220b composed of a shanghai conveying motor 210b for rotating the screw thread 208b. Corrector minutes of removable pressure gauge, characterized in that the control configuration. The method of claim 2, The left and right transfer motor 224 is a belt pulley 22 assembled with a time belt 222a connected to one side of the lower fixing plate 214a of the movable table 218 to precisely control the position of the movable table 218. Calibrating device of deadweight tester, characterized in that the configuration.