CN107478306A - A kind of storage tank liquid-level meter field calibration device - Google Patents

Abstract

The invention discloses an on-site calibration device for a liquid level gauge of a storage tank, comprising: a handheld laser rangefinder, a bracket, a bearing, a rotating disk, a float, a telescopic tube and a temperature measuring module; the temperature and humidity measuring module includes a thermometer, a bluetooth Transceiver and temperature and humidity sensors. The invention considers the on-site calibration of the liquid level gauge, and can calibrate the liquid level gauge of the storage tank on site. The invention utilizes the high-precision characteristics of the hand-held laser range finder in length measurement, and combines the float reflection device floating on the liquid surface to perform online calibration on the liquid level gauge, and at the same time, temperature and humidity compensation is performed on the measurement results. The measured liquid level and temperature and humidity values can be transmitted to the host computer through the Bluetooth transceiver module for analysis and processing. The present invention can change the current situation that the liquid level gauge must be dismantled for analog measurement and calibration, avoiding damage to the liquid level gauge during disassembly, installation and transportation, and improving the calibration accuracy of the liquid level gauge.

Description

An on-site calibration device for a liquid level gauge of a storage tank

technical field

The invention relates to an on-site calibration device for a liquid level gauge of a storage tank, which is used for on-site calibration of the liquid level gauge used in the liquid storage tank.

Background technique

In recent years, my country's liquid level measurement technology has made great progress, and various types of liquid level measurement instruments, such as radar level gauges, ultrasonic level gauges, and servo level gauges, have also been more and more used. However, at present, there is no stroke standard for the detection of different types of automatic liquid level measuring instruments in my country, and there are few calibration methods and low precision, which affects the development of my country in the field of automatic liquid level measurement.

The traditional liquid level gauge verification method is to use the manual scale method or the comparison method. The manual scale method can be used for on-site calibration of the liquid level gauge, but the manual scale method is limited by the method itself and manual readings, etc., and the error is large; The comparison rule is to use a high-precision liquid level gauge to calibrate a low-precision liquid level gauge, and a high-precision liquid level gauge is generally placed in a professional institution such as a metrology institute. Therefore, the liquid level gauge to be tested needs to be disassembled and transported to The verification is carried out in a specific place, during which uncertain factors such as transportation and installation may have a certain impact on the liquid level gauge itself and its verification results; the verification device is often bulky and occupies a large area, and regular maintenance also requires a lot of time. Human and material resources; In addition, these verification methods have low measurement accuracy and are easily affected by interference factors such as temperature and humidity.

Contents of the invention

The object of the present invention is to propose an on-site calibration device for a liquid level gauge of a storage tank to realize online calibration of the liquid level gauge of a storage tank and avoid the disadvantages of the above-mentioned calibration method.

In order to realize the present invention, the following technologies are proposed: a field calibration device for a storage tank level gauge, comprising: a hand-held laser range finder, a bracket, a bearing, a rotating disk, a float, a telescopic tube and a temperature measuring module; the inner ring of the bearing It is fixed together with the rotating disk, so that the rotating disk can follow the inner ring of the bearing to rotate; the outer ring of the bearing is provided with leveling bolts, and the leveling bolts are in contact with the flange at the top of the telescopic tube; the alignment of the device is completed by rotating the leveling bolts leveling. A hole is arranged on the rotating disk for the laser emitted by the hand-held laser range finder to pass through. The support is installed vertically on the rotating disk. The bracket is provided with shrapnel for fixing the handheld laser range finder on the bracket.

Preferably, the float is placed inside the telescopic tube and can only float up and down with the liquid level inside the telescopic tube; the shape of the float is a regular dodecahedron.

Preferably, the temperature measurement module includes a thermometer arranged on the lower surface of the float, a bluetooth transceiver device and a temperature and humidity sensor arranged on the lower surface of the rotating disk for real-time measurement of the temperature and humidity of the air in the tank and the temperature of the liquid in the tank, And transmit the measurement results to the host computer for temperature and humidity compensation on the measurement results.

The beneficial effects of the present invention are: the on-site calibration of the liquid level gauge of the storage tank is realized, and the problem that may affect the calibration result during the transportation and installation of the liquid level gauge in the comparison method is avoided; The problem of being controlled may drift out of the measurement range of the laser rangefinder. On the other hand, it also makes the device more adaptable. It can calibrate liquid level gauges of different specifications, oil tanker level gauges, etc.; laser rangefinder The measurement results of the temperature and humidity sensor can be transmitted to the host computer through Bluetooth, which is convenient to use; the calibration value after temperature and humidity correction has high accuracy, which is far better than the manual measuring method.

Description of drawings

Fig. 1 is a schematic diagram of a bearing, a rotating disk and a device on the rotating disk.

Fig. 2 is an overall structural diagram of the on-site calibration device for the storage tank liquid level gauge of the present invention.

Fig. 3 is a bottom view of the bearing and the rotating disk.

Figure 4 is a schematic diagram of the device being used on site.

In the figure, laser rangefinder 1, bracket 2, shrapnel 3, rotating disc 4, bearing 5, leveling bolt 6, hole 7, float 8, Bluetooth transceiver device 9, thermometer 10, temperature and humidity sensor 11, flange 12, Telescopic tube 13, storage tank 14, storage tank metering hole 15, metering hole flange 16.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation, but the present invention is not limited to these embodiments.

As shown in Figures 1, 2, and 3, the present invention provides an on-site calibration device for a liquid level gauge in a storage tank, including a handheld laser rangefinder 1, a bracket 2, a bearing 5, a rotating disk 4, a float 8, a telescopic tube 13 and a The temperature and humidity module, the temperature and humidity measurement module includes a thermometer 10, a bluetooth transceiver 9 and a temperature and humidity sensor 11. The inner ring of the bearing 5 and the rotating disk 4 are fixed together, so that the rotating disk 4 can follow the rotation of the inner ring of the bearing; the outer ring of the bearing 5 is provided with a leveling bolt 6, and the method between the leveling bolt 6 and the top end of the telescopic tube 13 The flange 12 is in contact; the leveling of the device is completed by rotating the leveling bolt 6. A hole 7 is provided on the rotating disk 4 for the laser emitted by the laser range finder 1 to pass through. The bracket 2 is installed vertically on the rotating disk 4 and rotates together with the rotating disk;

As shown in Figure 4, before the measurement and calibration work starts, the installation of the device on site must be completed. The specific steps are: 1) adjust the length of the telescopic tube 13 according to the height of the storage tank 14 and the approximate depth of the liquid in the tank; 2) place the telescopic tube 13 into the metering hole 15 of the storage tank, and clamp the top flange 12 of the telescopic tube on the flange 16 of the metering hole of the storage tank; 3) Put the float 8 into the telescopic tube 13; 4) Put the bearing 5, the rotating disc 4, the bracket 2. After the handheld laser range finder 1 is installed respectively, it is placed on the flange 12 at the top of the telescopic tube 13 .

The float 8 is placed inside the telescopic tube 13 and can only float up and down with the liquid level inside the telescopic tube 13 to prevent the float from floating arbitrarily; the shape of the float 8 is a regular dodecahedron, and when floating in the liquid, it can ensure The surface illuminated by the laser rangefinder is a horizontal plane. It should be noted that if the surface of the float is too rough, it will affect the measurement accuracy, and if the surface of the float is too smooth, the reflected light will affect the normal operation of the laser range finder.

With reference to Fig. 1, shown in 2, described thermometer 10, bluetooth transceiver 9 are arranged on the float lower surface, are used for measuring the temperature of the liquid in the storage tank in real time; Measure the temperature and humidity of the air in the storage tank; the measurement results are sent to the host computer through the Bluetooth transceiver device 9, and are used to perform temperature and humidity compensation on the liquid level measurement results.

The present invention can take following specific implementation steps to carry out:

After installing the telescopic tube 13, the bearing 5 and the device on the bearing, observe the angle reading of the handheld laser rangefinder 1, and at the same time continuously rotate and adjust the leveling bolt 6 until the display of the handheld laser rangefinder 1 is perpendicular to the horizontal plane; measure the liquid level , to measure the temperature and humidity of the air in the storage tank 14 and the temperature of the liquid in the storage tank 14 at the same time, and transmit the measurement results to the host computer for storage through Bluetooth; Save, and the single measurement is over.

Rotate the rotating disk 4, and observe the change of the angle reading of the handheld laser rangefinder 1 at the same time, until the handheld laser rangefinder 1 is perpendicular to the horizontal plane again, perform liquid level measurement and temperature and humidity measurement again, and save the results. After repeating this many times, the measurement data is processed, and temperature and humidity compensation is performed on it to obtain the final measurement result; the final measurement result is compared with the reading of the liquid level gauge to be tested, and the on-site calibration of the liquid level gauge to be tested is completed.

Claims (3)

1. A kind of 1. storage tank liquid-level meter field calibration device, it is characterised in that including：Hand-hold Distance Finder（1）, support（2）, axle Hold（5）, rotating disk（4）, float（8）, telescoping tube（13）With temperature measurement wet module；Described temperature measurement wet module includes thermometer （10）, bluetooth transceiver therein（9）And Temperature Humidity Sensor（11）；The bearing（5）Inner ring and rotating disk（4）It is fixed together, So as to rotating disk（4）Bearing inner race can be followed to rotate；The bearing（5）Leveling bolt is provided with outer ring（6）, leveling bolt （6）With telescoping tube（13）The flange on top（12）It is in contact；By rotating leveling bolt（6）The leveling of complete twin installation；It is described Rotating disk（4）On be provided with a hole（7）, for Hand-hold Distance Finder（1）The laser launched during work passes through；The support （2）It is vertically mounted on rotating disk（4）On；The support（2）On be provided with shell fragment（3）, for by Hand-hold Distance Finder（1）Gu It is scheduled on support（2）On.
2. 2. according to claim（1）A kind of described storage tank liquid-level meter field calibration device, it is characterised in that float（8）Place In telescoping tube（13）Inside, can only be in telescoping tube（13）Fluctuated with liquid level inside；Described float（8）Profile is positive 12 Face body.
3. 3. according to claim（1）A kind of described storage tank liquid-level meter field calibration device, it is characterised in that described thermometer （10）, bluetooth transceiver therein（9）Float lower surface is arranged at, for measuring storage tank（14）Interior fluid temperature；Temperature Humidity Sensor （11）It is arranged at rotating disk（4）Lower surface, for measuring storage tank（14）Interior aerial temperature and humidity.