CN2242458Y

CN2242458Y - Microcomputer controlled movement viscosity instrument

Info

Publication number: CN2242458Y
Application number: CN 95211823
Authority: CN
Inventors: 吴顺生; 胡永河
Original assignee: Nanchang Inst Of Science And Tech Shanghai Railway Bureau
Current assignee: Nanchang Inst Of Science And Tech Shanghai Railway Bureau
Priority date: 1995-05-15
Filing date: 1995-05-15
Publication date: 1996-12-11
Anticipated expiration: 2005-05-15

Abstract

The utility model relates to a microcomputer controlled movement viscosity instrument, comprising a monolithic microcomputer, measuring control circuits, an auxiliary heater, a temperature control heater, a stirrer, an illumination lamp, a bathtub with constant temperature, a capillary viscosimeter, a temperature sensor, a digitron displayer, an alarm, a switch stabilized power supply and a keyboard. The automatic heating and controlling of constant temperature of the bathtub with constant temperature are carried out by the monolithic microcomputer automatically. Numbers show the temperature. The timing and automatic calculation are carried out by the microcomputer so as to show the kinematic viscosity and the Engler viscosity of the measured oil sample. The utility model has the advantages of easy operation and maintenance, accurate measured data, high cost performance, non-manual intervention, therefore, the utility model can lighten labor intensity of testing personnel.

Description

The system controlled by computer kinematic viscosimeter

The utility model relates to viscosity meter, relates in particular to a kind of system controlled by computer kinematic viscosimeter.

Kinematic viscosity is an important indicator of petroleum products, and nearly all relevant oil product standard is all classified it as the project of must surveying.Also be that railway chemical examination department is using oily routine test project for all kinds of.Country has determined special standard GB for this reason _265-88

Owing to the viscosity-temperature characteristics amount of varying with temperature of oil product is very big, therefore in the mensuration process, must keep the constant of temperature field, GB _265-88It is constant in ± 0.1 ℃ that the regulation test temperature must keep, and therefore, test has proposed very high requirement to the temperature adjustment of Constant temperature bathtub.For a long time, what chemical examination department continued to use is two traditional formula temperature control techniques, and adopts artificial visual reading aids in temperature control, manually timing, measurement result is by manually carrying out data processing, and temperature-controlled precision is poor, labour intensity is big, time-consuming, take a lot of work, measuring accuracy is also lower.In recent years, improve though done some on the structure of thermostatic bath, the improvement of observation and control technology aspect is little.Homemade existing product mostly is simple electrical control, and automatic viscometer has also only adopted early stage microprocessor Z preferably ₈₀Deng, all be inferior to present industry control type single-chip microcomputer aspect anti-interference and the reliability, and its adjusted is complicated, so use face is narrower.Along with development and national economy, a large amount of internal combustion apparatus come into operation.Chemical examination department presses for a kind of novel intelligent instrument that upgrades on existing kinematic viscosity analyzer basis.

The purpose of this utility model is: provide a kind of have higher performance, easy to operate, safeguard simply, have data-handling capacity simultaneously, can directly measure the system controlled by computer kinematic viscosimeter of kinematic viscosity and Engler number.

The utility model by single-chip microcomputer and circuit of measurement and control, heat up auxiliary heater, two groups of temperature control well heaters, stirrer, illuminating lamp at a high speed, Constant temperature bathtub, capillary viscosimeter, temperature sensor, charactron display, alarm and switching power supply are formed, by the Single-chip Controlling well heater Constant temperature bathtub is added gentle thermostatic control automatically fast, digital displaying temperature and timing are calculated automatically and are shown measurement result.

The utility model has been set up intensification temperature control interface circuit and has been made of 74 serial drivers, photoelectrical coupler, triode, solid-state relay and other Resistor-Capacitor Unit in single-chip microcomputer.

6 electronic stopclocks and temperature in the single-chip microcomputer of the present utility model show shared charactron display and keyboard, distribute number of times and path by single-chip microcomputer.

Temperature measuring circuit of the present utility model has adopted high precision linear compensation operational amplifier, high precision double integration A/D converter.

The utlity model has following advantage:

Adopt industry control type single chip microcomputer technology, realize complete machine control, measurement and data processing, hardware configuration is simple, and major function is transferred to software realize, the reliability height, debugging maintenance is revised simple; Constant temperature, temperature survey all control are carried out by single-chip microcomputer, need not manual intervention, have alleviated laboratory personnel's labour intensity greatly, have improved measuring accuracy.That the utility model also has is easy to operate, it is simple to safeguard, the advantage that determination data is accurate, cost performance is high also has data-handling capacity and error correction display capabilities simultaneously.

Fig. 1: be the utility model device block diagram.

Fig. 2: be the utility model principle process block diagram.

Fig. 3: be the circuit diagram of the utility model intensification temperature control interface circuit.

Fig. 4: be the circuit diagram of the utility model temperature measuring circuit.

Contrasting accompanying drawing below in conjunction with embodiment is elaborated to the utility model

The utility model is by microcomputer and circuit of measurement and control 1, auxiliary heater (100W) 2, temperature control well heater (600W, 300W) 3,4, stirrer 5, illuminating lamp 6, Constant temperature bathtub 7, and temperature sensor 8, charactron display 9, alarm 10, capillary viscosimeter 11, switching power supply 12 and keyboard 13 are formed.Automatically add gentle thermostatic control, digital displaying temperature and timing fast by 2,3,4 pairs of Constant temperature bathtubs 7 of system controlled by computer well heater, calculate automatically and show measurement result.

The utility model in single chip microcomputer, set up one by micro-processor controlled high speed auxiliary heat up and the temperature control interface to realize high accuracy temperature control.This intensification and temperature control interface circuit are by 74 serial homophase (as: 7407) drivers, photoelectrical coupler GD, triode T ₁, solid-state relay GJ ₅And resistance R ₁, R ₂, R ₃, R ₄Form.The P of the central processing unit 8031 of single chip microcomputer ₁₅, P _1.1, P _1.0Control three

well heaters

2,3,4 respectively, they connect

input

1,11,13 pin of driven in phase device respectively, and

driver output pin

2 or 10 is connected to photoelectrical coupler GD control trigger end, and photoelectrical coupler GD exports through resistance R ₃To triode T ₁Base stage, triode T ₁Collector meet solid-state relay GJ ₅Negative terminal, the break-make of 3,4 and 220 volts of power supplys of solid-state relay control heater, its principle is as follows: control 300W and 600W well heater are two groups of same circuits, are example with 300W, P during heating _1.5The output noble potential makes driven in phase device 7407 pin 2 be noble potential, and photoelectrical coupler GD ends, triode T ₁Conducting makes solid-state relay GJ ₅The zero cross fired conducting, the 220V alternating current is added on the 300W well heater, makes the work of 300W well heater.The work side of 300W and 600W well heater becomes batch (-type) break-make mode, regulates and thermostatic control so that carry out PID.Solid-state relay GJ ₅Adopt contactless solid-state relay, and be the zero cross fired pattern.The 1000W well heater is just devoted oneself to work when fast the intensification, each only the measurement moved once, therefore adopt the prime principle of work similar to other two well heaters, disturb in order to prevent that control circuit from producing single-chip microprocessor system, the power supply of single chip microcomputer power supply and control circuit separates, and isolates by photoelectrical coupler.D+5V is a microcontroller power supply among the figure, and A+5V is the control circuit power supply,

Be control circuit ground.

The utility model temperature measuring circuit is by temperature sensor 8, operational amplifier IC, capacitor C ₁, C ₂And resistance R ₅, R ₆, R ₇Form.Temperature sensor Rt adopts accurate platinum resistance temperature sensor (Pt100), operational amplifier IC to adopt high-precision low-drift operational amplifier OP ₀₇, its 7 pin connects+and 5V, 4 pin connect-5V resistance R ₅One termination 2.5V reference voltage, other end jointing temp sensor Rt.The utility model A/D converter is 41/2 double integration A/D converter ICL ₇₁₃₅, this is a kind of low-speed a/d converter, its speed is per second 2-3 time to 10 times, but the conversion resolution height, good linearity, anti-power frequency interference performance is strong, easy and microcomputer interface.Constant temperature bathtub of the present utility model adopts the double-layer heat insulation device, its thermostatic control adopts auxiliary at a high speed intensification of microcomputer to add the control model that PID regulates, promptly when the constant temperature point of height setting is far away, open whole well heaters, when near the constant temperature point set, select temperature

control well heater

3 or 4 by microcomputer for use according to room temperature and the difference decision of setting constant temperature point again, or two groups are regulated and control simultaneously.

6 electronic stopclocks and temperature in the single-chip microcomputer of the present utility model show shared charactron display and keyboard, and distribute number of times and path by single-chip microcomputer.

The utility model adopts manual manual time-keeping, makes full use of single-chip microcomputer timer resource, by adjusting regularly constant, makes accuracy of timekeeping be better than 0.05 second, and can realize that measuring chronometric data directly reads in.Output interface when the utility model also is provided with the school can directly be exported the sprocket pulse signal, is checked by standard meter or chronographic recorder.For improving manual accuracy of timekeeping, the timing button adopts short stroke high sensitivity button, and the anti-shake time-delay of cancellation on software processes, adopts direct redirect mode, has effectively improved accuracy of timekeeping.

Measuring process of the present utility model is as follows: when opening this instrument, switching power supply 12 is supplied with the required power supply of each several part, illuminating lamp 6 is lighted, with Constant temperature bathtub 7 illuminations, stirrer 5 constantly stirs the heating liquid in the Constant temperature bathtub 7, the temperature of temperature sensor 8 impressions liquid to be heated, determine three well heaters 2 through single chip microcomputer and circuit of measurement and control 1 according to determined test temperature, 3, whether 4 all devote oneself to work, when being heated near its test temperature, close auxiliary heater 2, by temperature control well heater 34 or both co-operation carry out proportion integration differentiation (PID) and regulate.Make its constant temperature on test temperature, when constant temperature time arrives, alarm 10 alarms, remind operating personnel can begin the capillary viscosimeter 11 that always is immersed in the Constant temperature bathtub 7 is measured, generally put into four capillary viscosimeters in the Constant temperature bathtub 7, all the oil sample in it is flow to another point by any and carry out timing, 9 timing of charactron display are calculated automatically and are shown kinematic viscosity or Engler viscosity.

Claims

1, a kind of system controlled by computer kinematic viscosimeter, comprise single chip microcomputer and circuit of measurement and control (1), temperature control well heater (3,4), stirrer (5), illuminating lamp (6), Constant temperature bathtub (7), temperature sensor (8), capillary viscosimeter (11), keyboard (13) and power supply (12), it is characterized in that: also comprise auxiliary heater (2), charactron display (9), alarm (10), power supply (12) adopts switching power supply, by controlled by single chip microprocessor well heater (2,3,4) Constant temperature bathtub (7) is carried out fast and thermostatic control automatically, digital displaying temperature and timing are calculated automatically and are shown measurement result.

2, system controlled by computer kinematic viscosimeter according to claim 1, it is characterized in that: be provided with in microcomputer and the circuit of measurement and control (1) and heat up and the temperature control interface circuit, by 74 serial driven in phase devices, photoelectrical coupler (GD), triode (T ₁), solid-state relay (GJ ₅) and resistance (R ₁-R ₄) form; The P of the central processing unit 8031 of single chip microcomputer _1.5, P _1.1, P _1.0Control three well heaters (2,3,4) respectively, and connect input 1,11,13 pin of driven in phase device respectively, driven in phase device output pin 2 or 10 is connected to photoelectrical coupler (GD) control trigger end, and photoelectrical coupler (GD) is exported through resistance (R ₃) to triode (T ₁) base stage, its collector is connected to relay (GJ ₅), by relay (GJ ₅) control heater logical this.

3,1 or 2 described system controlled by computer kinematic viscosimeters as requested is characterized in that: 6 electronic stopclocks and temperature in the single-chip microcomputer show shared charactron display end (9) and keyboard (13), and distribute number of times and path by single-chip microcomputer.

4, system controlled by computer kinematic viscosimeter according to claim 1 and 2 is characterized in that: the temperature measuring circuit in microcomputer and the circuit of measurement and control (1) is by temperature sensor (8), operational amplifier (IC), anti-interference capacitor (C ₁, C ₂) and resistance (R ₅-R ₇), temperature sensor (2) adopts accurate platinum resistance temperature sensor, and operational amplifier (IC) is used the high-precision low-drift operational amplifier; A/D converter is 4 1/2 double integration A/D converters.