CN2363283Y

CN2363283Y - Material moisture analyzer

Info

Publication number: CN2363283Y
Application number: CN99205528U
Authority: CN
Inventors: 赵敦忠
Original assignee: China Building Materials Academy CBMA
Current assignee: China Building Materials Academy CBMA
Priority date: 1999-03-11
Filing date: 1999-03-11
Publication date: 2000-02-09
Anticipated expiration: 2009-03-11

Abstract

The utility model relates to a material moisture analyzer with quick determination. The determination of the material moisture is realized through measuring the pressure of acetylene gas generated by the reaction of calcium carbide and the moisture contained in samples. The apparatus is mainly composed of a sample reactor, an automatic feeding device, a temperature sensor, a pipe passage for connecting a pressure transmitter and a stirring device, wherein, the automatic feeding device is composed of a magnetism controlling coil, a magnetic conductor, an armature, an armature arm and an automatic feeding ladle; the stirring device is composed of an electromagnetic stirrer and a fin roller magnetic stirring bar in a beaker. Furthermore, the apparatus also comprises a single chip computer system. The apparatus has the advantages of broad application ranges, high analysis speed, convenient operation and high precision, and analysis results can be directly displayed and printed.

Description

Material moisture analyzer

The utility model relates to a material moisture analyzer belongs to materialization capability test technical field. The method is suitable for measuring the water content in the solid powder sample and is also suitable for measuring the water content in the heavy oil.

The determination and control of moisture is of great importance tomany industrial sectors. In order to improve the product quality, reduce the cost and reduce the energy consumption, the requirements on the rapid and accurate moisture determination of the moisture in the materials are higher and more urgent.

At present, the analysis method for measuring the moisture in the material includes an infrared method, a radio frequency method, a microwave method, a neutron method, a capacitance method, an electric conduction method, a radiation drying method and the like. It can be seen that almost any physical or chemical phenomenon having some mechanism for moisture content is used to make a moisture sensor, which on the one hand illustrates the exigency of developing moisture determination techniques and on the other hand illustrates the difficulty of making a moisture sensor with strong versatility and reliable stability. The infrared method is characterized by rapidness and high precision, but the output of the instrument is different due to different substances, the cost is higher, and black substances cannot be measured. The radio frequency method and the microwave method have high sensitivity, can continuously measure, but are not ideal for materials with uneven particle size and hardness. The neutron method is suitable for measuring the moisture content of inorganic substances containing no hydrogen, but cannot distinguish mixed water from crystal water. The capacitance method and the conductance method have simple structures and low cost, but the measurement precision is not high enough, and the performance is unstable. The above methods are indirect measurement methods, and the measurement by the classical drying method belongs to a direct measurement method, and has the disadvantages of slow drying speed and time consumption.

The utility model aims at overcoming the defects of the method and providing a novel moisture measuring device, the workingprinciple of the utility model is that under a certain condition, calcium carbide reacts with water in a sample to generate acetylene gas, the gas pressure and the moisture content of the acetylene gas form a linear relation, and the moisture content in the sample is measured by measuring the pressure of the acetylene gas, thereby not only solving the time-consuming problem of a drying method, but also solving the limitations of a plurality of indirect measuring methods; under the closed condition, calcium carbide is automatically added, and a high-sensitivity air pressure sensor is used for acquiring data.

The structure of the utility model is shown in figures 1-4, and comprises a reactor (11), a reactor cover (1), a beaker (8), a beaker spring clamping seat (9), an automatic feeding device, an electromagnetic stirring device, a temperature sensor (16) and a pipeline (2) connected with a pressure transmitter; a sealing ring (4) is arranged between the reactor (11) and the reactor cover (1) and is fixed by a nut and a bolt (15), a hole for connecting a pipeline (2) of a pressure transmitter and a hole for connecting a temperature sensor (16) are arranged on the reactor cover (1), a beaker (8) is fixed in the reactor (11) by a beaker spring clamping seat (9), an automatic feeding device comprises a magnetic control coil (3), a magnetizer (5) and an armature arm (7) of an armature (6) which is connected into a whole and an automatic feeding scoop (13), the armature arm (7) can rotate around an automatic feeding scoop shaft (10), when the magnetic control coil is electrified, the magnetizer (5) has magnetism and attracts the armature (6), so that the automatic feeding scoop (13) keeps a horizontal position, when the magnetic control coil is powered off, the magnetizer (5) loses magnetism, the armature arm (7) of the armature (6) and the automatic feeding scoop (13) fall down, the calcium carbide powder (14) in the spoon is sprinkled down, an electromagnetic stirrer (17) arranged below the reactor (11) can drive a fin roller magnetic stirring rod (12) in the beaker to stir when being electrified, and the calcium carbide powder and the material to be detected are mixed so as to accelerate the chemical reaction.

The magnetic stirring rod (12) with the fin roller in the beaker (8) can have two structures, one is a circular ring type fin roller (12a), and the other is a spiral fin roller (12 b). The spiral finned roller is more beneficial to uniformly stirring the powdery materials (figures 2-3).

The utility model discloses an operating principle is that moisture content reaction produces acetylene gas in according to calcium carbide powder and the sample, and its gas pressure and moisture content are linear relation, therefore through survey acetylene gas's pressure, realizes the survey of moisture content in the sample, its chemical reaction formula as follows:

the gas conforms to the ideal gas equation of state:

PV ═ nRT formula wherein: p-pressure; v-volume; r-ideal gas constant;

n-mole number; t-absolute temperature.

The percentage content of water is KPV/RTm formula: a K-factor; m-sample mass.

The utility model discloses a realize like this, under inclosed condition, during the sample that is surveyed is added to the carbonization calcium powder, the special wing roller magnetic stirring stick of needs to be placed in the beaker that holds the sample to the reaction of carbonization calcium powder and sample. Acetylene gas converts pressure signals into voltage signals through a pressure transmitter, the voltage signals and the voltage signals converted by a temperature sensor are sequentially read in by amulti-way switch, then the voltage signals are converted into 12-bit digital quantity signals by an analog-to-digital converter, the signals are subjected to data processing by a single chip microcomputer, and the single chip microcomputer is responsible for data acquisition and operation, data display and printing of the whole system and control of a keyboard. After the system is powered on, the program memory automatically reads in the internal program and executes the monitoring and managing function according to the program running sequence, and the process data is stored in the data memory. Important parameters such as date, time, pressure, volume, temperature, mass, sample number and the like are stored in the erasable memory and can be modified at any time. The keyboard provides scanning signals and automatically reads key values, dynamic display is carried out by the display, and the printer prints measurement data, K value, quality m, date, time, number and the like. The reset and monitoring circuit has the functions of system power-on reset, manual reset and system operation monitoring.

The utility model discloses a can be through the automatic zero setting of zero setting electric potential. The quality of the sample, the volume of the reactor, the K value, the time limit, the error and the printing can be changed, and the application range and the accuracy of the instrument are enlarged. Utility model can also be corrected with the standard sample.

According to the above principle, the electromagnetic stirrer (17), the temperature sensor (16), the single chip microcomputer and the interface in the host (21) of fig. 4, the pressure transmitter, the micro printer (20), the keyboard (9), the digital display (18) and the like which are related in the process of measuring the moisture content by using the device of the utility model are the prior art and are not described in detail herein.

The utility model has the advantages that; the device is convenient to operate, wide in application range, high in analysis speed and high in precision, only 3-10 minutes are needed for analyzing one sample, the analysis result is directly displayed and printed, and the device develops a new way for measuring the water content in the material.

Description of the drawings:

fig. 1 is a front view of the present invention, partially in section, showing the internal construction.

FIG. 2 is a 1 st version of the finned magnetic stir bar (12) of FIG. 1; a circular ring type.

FIG. 3 is a 2 nd version of the finned magnetic stir bar (12) of FIG. 1; and (4) a spiral type.

Fig. 4 is a combination of the present invention and the prior art, and the contents of the case (21) are known in the art.

The implementation mode is as follows:

the reactor is made of nonmagnetic materials such as stainless steel, aluminum alloy and the like, and the magnetic stirring rod of the finned roller is made of ferromagnetic materials.

Claims

1. A material moisture analyzer is characterized in that: the device is composed of a reactor (11), a reactor cover (1), a beaker (8), a beaker spring clamping seat (9), an automatic feeding device, an electromagnetic stirring device, a temperature sensor (16) and a pipeline (2) connected with a pressure transmitter; a sealing ring (4) is arranged between the reactor (11) and the reactor cover (1) and is fixed by a nut and a bolt (15), a hole for connecting a pipeline (2) of a pressuretransmitter and a hole for connecting a temperature sensor (16) are formed in the reactor cover (1), a beaker (8) is fixed in the reactor (11) by a beaker spring clamping seat (9), and an automatic feeding device consists of a magnetic control coil (3), a magnetizer (5), an armature (6), an armature arm (7) and an automatic feeding spoon (13), which are connected into a whole; the armature arm (7) can rotate around the automatic feeding spoon shaft (19); an electromagnetic stirrer (17) is arranged under the reactor (11) and is matched with a fin roller magnetic stirring rod (12) in the beaker for use.

2. The material moisture analyzer as set forth in claim 1, wherein the fin-roller magnetic stirring rod (12) has two structures, one is a circular fin roller (12a) and the other is a spiral fin roller (12 b).