CN2541840Y

CN2541840Y - Material moisture measurer

Info

Publication number: CN2541840Y
Application number: CN 02202220
Authority: CN
Inventors: 洪培光; 李明喆
Original assignee: TONGLING KEXING COMPUTER TECHNOLOGY Co Ltd
Current assignee: TONGLING KEXING COMPUTER TECHNOLOGY Co Ltd
Priority date: 2002-01-09
Filing date: 2002-01-09
Publication date: 2003-03-26
Anticipated expiration: 2012-01-09

Abstract

The utility model relates to a material moisture measuring apparatus, which comprises a baking oven, a data sampling apparatus and a computer handling system, wherein the baking oven is provided with a heating device, an air exit hole and a temperature sensor, the data sampling apparatus comprises a box body, a tray, a frame, a resistance strain pressure transducer, an amplifying circuit and an A/D switching circuit, the box body is positioned on the lower end of the baking oven, the tray is fixed in the baking oven through the frame, the pressure transducer is fixed in the box body, and the lower end of the frame is fixed on the forced end of the pressure transducer. The utility model adapts the resistance strain pressure transducer with a lower price to be a force-detecting element for moisture measuring, the integration of weighing and control and data processing can be realized, the structure is simpler and the cost is greatly reduced, simultaneously, weighing and drying can be processed synchronously, errors brought by non-synchronization can be eliminated, and the precision can be improved.

Description

A kind of material aquametry apparatus

Technical field

The utility model relates to the detecting instrument that adopts the constant weight method to measure the powder and granule shape material water content.

Background technology

At present, the employing constant weight method measurement powder and granule shape material moisture content particularly water cut of grain adopts baking oven and high precision balance usually, and adopts oven dry, weighing repeatedly to calculate water cut again, complicated operating process, and the running time is long, easily produces error.In order to address this problem, publication number is that the patent documentation of 2110222U discloses a kind of " grain ' s moisture teller calibrating installation " measuring instrument by name, by the far infrared baking oven, electronic balance and one-chip computer are formed, establish inner metal sleeve in the baking oven, far infrared heater is arranged in cover, also be provided with balance on goods and services in the baking oven, draft tube, vent port and temperature element, baking oven is placed on the measure control case, electronic balance, single-chip microcomputer and temperature detecting controller are contained in the measure control case, balance on goods and services in electronic balance cramp bar and the baking oven connects, electronic balance reaches single-chip microcomputer with the digital signal of measuring and carries out data processing and display result, and single-chip microcomputer is also controlled and displays temperature numerical value temperature of oven by temperature controller.Though this measuring instrument has little, easy to operate, the fireballing characteristics of error, owing to adopt electronic balance, not only increased cost, but also can't guarantee oven dry, weigh and data processing is carried out synchronously, reduced accuracy of instrument.

Technical scheme

The purpose of this utility model is to provide a kind of low cost of manufacture, measuring speed is fast, measuring accuracy is high material aquametry apparatus, and the utility model material aquametry apparatus comprises baking oven, data sampling device and computer processing system; Be provided with heating arrangement, vent port and temperature sensor in the baking oven; The data sampling device comprises box body, pallet and support thereof, and described box body is positioned at the below of baking oven, and pallet is fixed in the baking oven by support; It is characterized in that the data sampling device also comprises pressure transducer, amplifying circuit, A/D change-over circuit, pressure transducer is fixed in the box body, and the support lower end is positioned at box body and is fixed on the force side of pressure transducer; Amplifying circuit is used for amplifying the voltage signal that pressure transducer obtains; The A/D change-over circuit is used for converting the voltage signal that amplifying circuit obtains to digital signal and handles for computer processing system and the demonstration measurement result.Described pressure transducer is a resistance strain type pressure sensor.The force side of pressure transducer is provided with upper and lower spacing device.The baking oven lower opening, and flexibly connect with box body; The box body top is provided with thermofin.Be provided with upper and lower reflecting plate in the baking oven, heating arrangement is fixed on the below of reflecting plate, and following reflecting plate is fixed on the box body, and pallet is between upper and lower reflecting plate.The box body at place, baking oven lower edge is provided with microswitch, and this microswitch is connected on the power circuit of heating arrangement, and baking oven is combined on the box body can make the microswitch closure.The utility model is owing to adopt the power detecting element of the lower resistance strain type pressure sensor of price as moisture measurement, realized the integrated of weighing and control and data processing, not only make structure more simple, cost is reduced significantly, also make simultaneously weigh, drying can carry out fully synchronously, eliminated the error of being brought by asynchronous, precision is improved.And oven structure is simple, and has good fast even drying capacity, and reflecting plate has basically formed an integral body after closing box up and down, thereby has guaranteed the homogeneity of internal temperature.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is the utility model circuit block diagram.

Embodiment is by shown in Figure 1, baking oven is made up of outer cover 1, upper and lower reflecting

plate

3,6 and heating arrangement, temperature sensor 4, outer cover 1 is the framework of lower opening, and be positioned at box body 16 tops of data sampling device, outer cover 1 is connected with box body by hinge in a side lower end, handle is housed on the outer cover, upwards outer cover can be started by handle; Box body is provided with microswitch 15, and this microswitch is connected on the power circuit of heating arrangement, when outer cover falls when covering on box body, and the microswitch closure, heating arrangement could begin to start; Temperature sensor 4 is housed in the outer cover, and the top of outer cover has vent port 7, is beneficial to distributing of water vapor; Heating arrangement adopts halogen heating tube 2 as heating element, and last reflecting plate 3 is fixed on outer cover 1 top, and following reflecting plate 6 is fixed on the box body 16, halogen heating tube 2 equidistant reflecting plate 3 belows that are installed in.Resistance strain type pressure sensor 14 is fixed in the box body 16 by base 13, tray supporter 10 is fixed on the force side of resistance strain type pressure sensor 14, hole under support 10 reaches by box body 16 on the reflecting plate 6 is stretched between the upper and lower reflecting

plate

3,6, and pallet 5 is fixed on the support 10; Box body 16 tops are provided with thermofin 8, conduct downwards to prevent heat, also are provided with an air barrier 9 below thermofin, and upper and

lower spacing screw

11,12 is set in the force side of resistance strain type pressure sensor 14, damage to prevent sensor.As shown in Figure 2, computer processing system is made up of single-chip microcomputer, display, keyboard, and single-chip microcomputer adopts 89 series, includes memory under program and data memory, configuration communication interface and printing interface.The voltage signal that resistance strain type pressure sensor obtains converts digital signal to by the A/D change-over circuit after amplifying circuit amplifies, deliver to the single-chip microcomputer processing again and show that by display measurement result is a water cut.Single-chip microcomputer also can carry out thermostatic control to baking oven simultaneously, the electric signal of temperature sensor output inputs to single-chip microcomputer through amplifying circuit and A/D change-over circuit, single-chip microcomputer is realized baking oven constant temperature by the heating power of SCR control heating arrangement again, and can pass through display displays temperature value.During test, earlier outer cover is upwards started, testing sample is put into pallet, close and start the heating schedule measuring instrument behind the outer cover and start working, the signal of the continuous reading temperature sensor of single-chip microcomputer and resistance strain type pressure sensor output, and show corresponding numerical value by display, make baking oven keep constant by controllable silicon simultaneously, when the resistance strain type pressure sensor output signal was constant, the water cut that display shows was measurement result.

Claims

1, a kind of material aquametry apparatus comprises baking oven, data sampling device and computer processing system; Be provided with heating arrangement, vent port and temperature sensor in the baking oven; The data sampling device comprises box body, pallet and support thereof, and described box body is positioned at the lower end of baking oven, and pallet is fixed in the baking oven by support; It is characterized in that the data sampling device also comprises pressure transducer, amplifying circuit, A/D change-over circuit, pressure transducer is fixed in the box body, the support lower end is positioned at box body and is fixed on the force side of pressure transducer, amplifying circuit is used for amplifying the voltage signal that pressure transducer obtains, and the A/D change-over circuit is used for converting the voltage signal that amplifying circuit obtains to digital signal and handles for computer processing system and the demonstration measurement result.

2, measuring instrument according to claim 1 is characterized in that described pressure transducer is a resistance strain type pressure sensor.

3, measuring instrument according to claim 2 is characterized in that the force side of pressure transducer is provided with upper and lower spacing device.

4, according to claim 1 or 2 or 3 described measuring instruments, it is characterized in that the baking oven lower opening, and flexibly connect with box body; The box body top is provided with thermofin.

5, measuring instrument according to claim 4 is characterized in that being provided with in the baking oven upper and lower reflecting plate, and last reflecting plate is fixed on the baking oven top, and following reflecting plate is fixed on the box body top; Heating arrangement is fixed on the below of reflecting plate, and pallet is between upper and lower reflecting plate.

6, measuring instrument according to claim 5 is characterized in that box body is provided with microswitch, and this microswitch is connected on the power circuit of heating arrangement, and baking oven can touch microswitch when lower cover is on box body makes it be opening.

7, measuring instrument according to claim 6 is characterized in that box body thermofin below also is provided with air barrier.