CN218973592U

CN218973592U - Basic error testing device of radar level gauge

Info

Publication number: CN218973592U
Application number: CN202222928255.7U
Authority: CN
Inventors: 陈颖; 刘铁军; 钱思远; 黄晨; 王志勇
Original assignee: Beijing Jingyi Instrument & Meter General Research Institute Co ltd
Current assignee: Beijing Jingyi Instrument & Meter General Research Institute Co ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-05-05
Anticipated expiration: 2032-11-04

Abstract

The utility model provides a basic error testing device of a radar level gauge, which is characterized in that: the units comprising the cylinders are connected in series, and the central axes of the cylinders of the units are coaxial; the antenna beam axis of the radar level gauge is overlapped with the central axis of the cylinder, the inner wall of the cylinder is coated with a wave absorbing material layer, and a laser range finder is arranged at the side of the radar level gauge; each unit comprises a frame, and the cylinder is fixedly arranged in the frame; one side of the unit is provided with a flashboard lifting mechanism. The utility model improves the degree of automation of the test and improves the working efficiency.

Description

Basic error testing device of radar level gauge

Technical Field

The utility model relates to a detection mechanism, in particular to a radar level gauge measuring device.

Background

The radar level gauge is used as a measuring instrument, is commonly used in the industrial and civil fields of liquid, cement, flour, hydrology and the like, is mainly used for carrying out non-contact continuous measurement on media such as liquid, slurry or granular materials and the like, and can be normally used in the occasions such as high dust concentration, high temperature, large pressure change, gas, steam and the like.

Calibrating the accuracy of radar level gauges and multi-point calibration are conventional ways of correcting errors,

in the prior art, manufacturers and detection mechanisms detect radar level gauges, and most of radar level gauges adopt a handcart type analog measurement method, which is also called an environmental simulation method, and the radar level gauge detection method comprises the following specific steps: the tested radar level gauge is fixed on the clamping table, a reflecting plate for receiving a reflection signal of the level gauge is arranged on a trolley with a wheel, and the distance between the level gauge and the reflecting plate is changed by manually pushing the trolley to perform multipoint basic error test.

The 'handcart' simulation measurement method requires excessive operators, and the labor cost is high. Meanwhile, frequent space transformation leads to slow testing speed and lower working efficiency.

Disclosure of Invention

The utility model provides a basic error testing device of a radar level gauge, which aims to solve the defects of the prior art, improve the testing automation degree and improve the working efficiency.

The technical scheme adopted for solving the technical problems is as follows:

the utility model provides a radar level gauge basic error testing arrangement which characterized in that:

the units comprising the cylinders are connected in series, and the central axes of the cylinders of the units are coaxial;

the antenna beam axis of the radar level gauge is overlapped with the central axis of the cylinder, the inner wall of the cylinder is coated with a wave absorbing material layer, and a laser range finder is arranged at the side of the radar level gauge;

each unit comprises a frame, and the cylinder is fixedly arranged in the frame;

one side of the unit is provided with a flashboard lifting mechanism: the flashboard of the flashboard lifting mechanism is positioned at the end surface of the cylinder, the two sides of the flashboard are respectively provided with a sliding block, the two sides of the frame are respectively provided with parallel guide rails, and the sliding blocks and the guide rails form a sliding block guide rail fit; a driving chain wheel and a driven chain wheel are arranged above the flashboard on the frame, a chain is wound above the driving chain wheel and the driven chain wheel, one end of the chain is fixedly connected to the top end of the flashboard, the connecting point is positioned on a bilateral symmetry line of the flashboard, the other end of the chain is hung with a counterweight, and the weight of the counterweight is the same as that of the flashboard; an output shaft of a motor mounted on the frame is connected to and drives the drive sprocket.

Further: a height-adjusting foot cup is arranged below the frame.

Further: the slide blocks are respectively arranged on two sides of the flashboard, the parallel guide rails are respectively arranged on two sides of the frame, and the slide blocks and the guide rails form a slide block guide rail fit.

Further: the upper end and the lower end of each guide rail are respectively provided with an upper limiting block and a lower limiting block, and the sliding block is positioned between the upper limiting block and the lower limiting block.

Further: the connection point of the chain and the top end of the flashboard is positioned on the bilateral symmetry line of the flashboard.

Further: all motors are connected with a controller to control the switch of the motors.

The utility model has the advantages that:

the utility model has simple transmission structure and high transmission efficiency, can independently control the lifting of each flashboard of each unit connected in series, and realizes the change of the distance between the level meter and the reflecting plate, thereby carrying out the test of multipoint basic errors. The device improves the automation degree of the existing analog measurement method of the level meter, and solves the problems of excessive operators and low working efficiency when the level meter leaves the factory for inspection.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a block diagram of the present utility model;

fig. 2 is a schematic diagram of the structure of a unit according to the present utility model.

Reference numerals in the drawings:

100: a radar level gauge;

11: a frame; 12: a cylinder; 13: a height-adjusting foot cup;

21: a motor; 22: a drive sprocket; 23: a chain; 24: a driven sprocket; 25: a flashboard; 26: a counterweight;

31: an upper limiting block; 32: a slide block; 33: a guide rail; 34: and a lower limiting block.

Detailed Description

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art. In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper," "lower," "inner," "outer," "bottom," and the like as used in this specification are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 and 2:

the device mainly consists of a plurality of sections of units (the units comprise a frame 11 and a cylinder 12) which are connected in series, and the central axes of the cylinders 12 of the units are coaxial.

The antenna beam axis of the radar level gauge 100 coincides with the central axis of the cylinder 12, and the inner wall of the cylinder 12 is covered with a layer of wave absorbing material, so that the radar wave reflected by the antenna propagates in an almost infinite space. A shutter 25 made of a metal material, which can be inserted perpendicularly to the axis, is provided at several reference point positions in the axis direction of the cylinder 12, and the level reflection is simulated so that the radar wave is reflected back to the antenna of the radar level gauge 100, and the level gauge measurement value at the reference point position is verified. The reference point value is given by a laser rangefinder mounted beside the radar level gauge 100.

As shown in fig. 2

Each unit comprises a frame 11, a cylinder 12 fixedly mounted in the frame 11, and a height-adjusting foot cup 13 provided below the frame 11. The height-adjusting foot cup 13 may be of a height-adjustable structure of the prior art, so that it is adjustable when mounted so that the central axes of the cylinders 12 of the units are coaxial and the antenna beam axis of the radar level gauge 100 coincides with the central axis of the cylinder 12.

One side of the unit is provided with a flashboard lifting mechanism:

the flashboard lifting mechanism mainly comprises a motor 21, a driving sprocket 22, a chain 23, a driven sprocket 24, a flashboard 25 and a counterweight 26.

The shutter 25 is located at the end surface of the cylinder 12, the two sides of the shutter 25 are respectively provided with a sliding block 32, the two sides of the frame 11 are respectively provided with parallel guide rails 33, and the sliding blocks 32 and the guide rails 33 form a sliding block guide rail cooperation, so that the shutter 25 can move up and down along the guide rails 33 without deflection.

The upper end and the lower end of each guide rail 33 are respectively provided with an upper limiting block 31 and a lower limiting block 34, and the sliding block 32 is positioned between the upper limiting block 31 and the lower limiting block 34.

In this way, the upper and lower limits of movement of the slider 32, that is, the upper and lower limits of movement of the shutter 25 are restricted, ensuring safety.

A driving sprocket 22 and a driven sprocket 24 are mounted on the frame 11 above the shutter plate 25. The chain 23 is wound above the driving sprocket 22 and the driven sprocket 24, one end of the chain 23 is fixedly connected to the top end of the flashboard 25, and the connecting point is positioned on the bilateral symmetry line of the flashboard 25 so as to keep the flashboard 25 stable in up-and-down movement, and the other end of the chain 23 is hung with a counterweight 26, wherein the weight of the counterweight 26 is the same as that of the flashboard 25. An output shaft of a motor 21 mounted on the frame 11 is connected to and drives a drive sprocket 22.

In actual use, only the motor 21 is controlled in sequence, the motor 21 drives the driving sprocket 22, the driven sprocket 24 and the chain 23 to move, the flashboard 25 can be driven to descend, radar waves emitted by the radar level gauge 100 are reflected by the flashboard 25 to the antenna of the radar level gauge 100, and the level gauge measurement value at the reference point position is checked. The shutter plate 25 is lifted up and down in sequence, so that a plurality of reflection signals with different distances can be obtained, and the multi-point basic error test can be performed.

All motors 21 may be connected to a controller to control the switches.

The flashboard lifting structure of the radar level gauge basic error testing device adopts a chain transmission mechanism with a counterweight. The structure can reduce the load of the motor to the maximum extent, has high transmission efficiency and stable and reliable operation. The shutter lifting mechanism can be quickly switched to a manual mode operation when no power is supplied or when electrical faults occur in the equipment.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a radar level gauge basic error testing arrangement which characterized in that: a plurality of units comprising cylinders (12) are connected in series, and the central axes of the cylinders (12) of the units are coaxial; the antenna beam axis of the radar level gauge (100) is overlapped with the central axis of the cylinder (12), the inner wall of the cylinder (12) is adhered with a wave absorbing material layer, and a laser range finder is arranged at the side of the radar level gauge (100); each unit comprises a frame (11), and a cylinder (12) is fixedly arranged in the frame (11); one side of the unit is provided with a flashboard lifting mechanism: the flashboard (25) of the flashboard lifting mechanism is positioned at the end surface of the cylinder (12), the two sides of the flashboard (25) are respectively provided with a sliding block (32), the two sides of the frame (11) are respectively provided with parallel guide rails (33), and the sliding blocks (32) and the guide rails (33) form a sliding block guide rail fit; a driving chain wheel (22) and a driven chain wheel (24) are arranged above the flashboard (25) on the frame (11), a chain (23) is wound above the driving chain wheel (22) and the driven chain wheel (24), one end of the chain (23) is fixedly connected to the top end of the flashboard (25), the connecting point is positioned on the bilateral symmetry line of the flashboard (25), the other end of the chain (23) is hung with a counterweight (26), and the weight of the counterweight (26) is the same as that of the flashboard (25); an output shaft of a motor (21) mounted on the frame (11) is connected to and drives a drive sprocket (22).

2. A radar level gauge basic error testing apparatus according to claim 1, wherein: a height-adjusting foot cup (13) is arranged below the frame (11).

3. A radar level gauge basic error testing apparatus according to claim 1, wherein: the upper end and the lower end of each guide rail (33) are respectively provided with an upper limiting block (31) and a lower limiting block (34), and the sliding block (32) is positioned between the upper limiting block (31) and the lower limiting block (34).

4. A radar level gauge basic error testing apparatus according to claim 1, wherein: the connection point of the chain (23) and the top end of the flashboard (25) is positioned on the bilateral symmetry line of the flashboard (25).

5. A radar level gauge basic error testing apparatus according to claim 1, wherein: all motors (21) are connected to a controller to control the switching of the motors.