CN2323356Y

CN2323356Y - Continuous capacitance sensor

Info

Publication number: CN2323356Y
Application number: CN 98220043
Authority: CN
Inventors: 王其明; 李春和; 王福文; 胡广东; 李文琦; 杨立新; 于浩业; 郑琪
Original assignee: 王其明; 李春和
Current assignee: Weihai Beiyang Electric Group Co Ltd
Priority date: 1998-01-07
Filing date: 1998-01-07
Publication date: 1999-06-09
Anticipated expiration: 2008-01-07

Abstract

The utility model relates to a continuous capacitance sensor, comprising a metal main pole. The upper end of the main pole is provided with a fixing flange plate, and the upper part of the flange plate is provided with a capacitance transmitter; a main pole bunker is insulating, a plurality of scaling electrodes are arranged at definite heights outside the metal main pole in the bunker, and the scaling electrodes are respectively connected with the transmitter through the cables in the main pole. The utility model realizes segmenting scaling by using the scaling electrodes, and enhances the measuring precision of the continuous capacitance transducer. The utility model has the advantages of simple structure, low cost and powerful anti-shock ability; the measuring precision can meet the requirements for measuring material levels in coal bunkers, stone bunkers, etc. The utility model is especially suitable for being used under mal-conditions.

Description

A kind of continuous capacitance sensor

The utility model relates to a kind of measurement mechanism, specifically a kind of continuous capacitance sensor.

We know, for solid material in the specific feed bin (powdery or bulk) amount what, utilizing the capacitive transducer measurement is one of more convenient at present, practical means.Traditional capacitive transducer is a kind of continuous capacitance sensor, promptly with the bulkhead of feed bin as a utmost point, make another utmost point to stretch into a metal electrode that is parallel to direction of measurement in the storehouse from Cang Ding, constitute one group and become the dielectric capacitance sensor, the variation of the capacitance signal by measuring the output of this capacitive transducer transmitter, the variation that can measure material level in the storehouse.During use, this survey sensor need adopt the alternate manner calibration, and difficulty is bigger; Simultaneously, because composition, moisture content, temperature, the granular physical parameter of material constantly change in the storehouse, original scaling point is no longer suitable, causes measurement result to be drifted about, and it is no longer accurate to measure.Though this measuring method can not satisfy the needs of user to level gauging eventually through improving repeatedly.In order to address the above problem, patent 91108963.2,94100133.4 has been introduced respectively and has severally been constituted the sectional capacitance sensor with insulated from each other, series arrangement, the set of segment electrodes and the bulkhead that are fixed together with suitable mode; Patent 89219440.5,94240007.0 has also proposed several sectional capacitance sensors, and the two poles of the earth of its each set of segmentation capacitive transducer provide by sensor self, is not related with the bulkhead of tested feed bin.Above-mentioned patent solves the scaling point problem by the continuous capacitance section, has reduced the influence of the change of properties of the accumulation of error and tested material to measurement structure, has improved measuring accuracy.But the project organization of section is complicated, and cost is higher, relatively poor, the narrow application range of shock resistance.

The purpose of this utility model is exactly to measure inaccurate and above-mentioned material level sectional capacitance sensor construction complexity, deficiency that cost is high in order to solve existing continuous capacitance sensor, provide a kind of simple in structure, cost is low, strong shock resistance is measured the continuous electric capacity sensor with enough accuracy.

For achieving the above object, a kind of continuous capacitance sensor, it establishes a metal main pole, and the main pole upper end is provided with to fix uses ring flange, and ring flange top is provided with capacitive pick-up, main pole is fixing with ring flange and feed bin insulation by insulating mat, main pole and feed bin bulkhead are respectively a utmost point, constitute to become the medium continuous capacitance, it is characterized in that very tubular structure of master metal, the main pole outside is some in the storehouse determines highly to be provided with the calibration electrode, and it is connected with transmitter by the cable that is arranged in the main pole pipe respectively.

The utility model is determined the calibration electrode of height and the two poles of the earth that the metal main pole forms calibration electric capacity, by judging the size of this calibration electric capacity, can determine whether the material in the storehouse arrives this scaling point, after judging that material reaches certain and determines height, the continuous capacitance value that is available this section height is calibrated, significantly reduced accumulated error, in time avoided the adverse effect of material physical factor variation measuring.The utility model is only judged having or not of material with the calibration electrode, do not carry out quantitative measurment, so the said calibration electrode of the utility model can select enough fewly, can be electrode terminal as it, be provided with insulation spacer between itself and the main pole, insulation spacer is full of the space between main pole and the calibration electrode.Having avoided folder powder phenomenon, improved impact resistance, is a kind of desirable subsection calibration continuous capacitance sensor.

Below in conjunction with accompanying drawing the utility model is described further:

Fig. 1 is the utility model structural representation.

As can be seen from Figure 1, a kind of continuous capacitance sensor, it is provided with a metal main pole 1, it is a tubular structure, its upper end is provided with fixing with ring flange 2, ring flange top is provided with capacitive pick-up 3, and main pole 1 is fixing by insulating mat 4 usefulness ring flanges 2 and feed bin insulation, and main pole and feed bin bulkhead (the earth) are the two poles of the earth that become the medium continuous capacitance.The some definite calibration electrodes 5 that highly are provided with in main pole 1 outside are provided with insulation spacer 6 between main pole 1 and the calibration electrode 5, and enrich its space at interval by insulation spacer.Each calibration electrode 5 is connected with transmitter 3 by the cable 7 that is arranged in the main pole pipe, thus the capacitance signal between output calibration electrode and the main pole.

The selection of the utility model calibration electrode number can decide according to the height of tested material feed bin, and a calibration electrode is set between general every 1-6 rice height, and it preferably is located at the bottom of being responsible for joint flange 6, to reduce the material impact.Judge whether material arrives this point, does not carry out quantitative measurment, and it can select enough for a short time owing to only form electric capacity, make it be reduced to negligible degree the influence of the electric capacity between the person in charge and bulkhead with the calibration electrode.Therefore, the utility model calibration electrode is an electrode terminal, is provided with insulation spacer between itself and charge electrode, has reduced the impact of material to electrode, and has avoided the material folding phenomenon.

The utility model course of work is such, along with material add put in storage in, it highly progressively improves, do not flood as yet when determining height A 1 at material, variator changes by the capacitance signal of measuring continuous capacitance output, compare with the last signal of its record, determined that promptly the thing position is at the height that is lower than the A1 part, after flooding definite height A 1, material (judges) by the calibration capacitance signal, transmitter is noted the continuous capacitance value n1 of 0-A1 section full with substance rapidly, with this value the A1-A2 section is calibrated, the continuous capacitance value n1 of the continuous capacitance value that records and definite height A 1 relatively just can determine the height of materials between A1-A2, equally between A2-A3, continuous capacitance value n2 with the continuous capacitance value that records and definite height A 2 compares, and can determine the height of materials between A2-A3 more exactly, and the like.Subsection calibration has significantly reduced accumulated error like this, is responsible for the areal survey of having realized material by a metal, has improved the precision of measuring greatly, has overcome sectional capacitance sensor construction complexity in the past, the deficiency that cost is high.

The utility model is simple in structure, cost is low, strong shock resistance, and measuring accuracy can satisfy the requirement to level gauging such as coal bunker, building stones storehouse, is particularly suitable for using under the environment mal-condition.

Claims

1, a kind of continuous capacitance sensor, it establishes a metal main pole, the main pole upper end is provided with the fixing ring flange of using, ring flange top is provided with capacitive pick-up, and main pole is fixing with ring flange and feed bin insulation by insulating mat, and main pole and feed bin bulkhead are respectively a utmost point, constitute and become the medium continuous capacitance, it is characterized in that very tubular structure of master metal, the main pole outside is some in the storehouse determines highly to be provided with the calibration electrode, and it is connected with transmitter by the cable that is arranged in the main pole pipe respectively.

2, continuous capacitance sensor as claimed in claim 1 is characterized in that said calibration electrode is an electrode terminal, is provided with insulation spacer between itself and the main pole, and enriches space between the two by insulation spacer.