CN202770732U - Rotating viscosity measuring system - Google Patents

Abstract

The utility model provides a rotating viscosity measuring system, which uses a grating torque sensor as a data acquisition device, wherein the grating torque sensor comprises an inner rotating shaft, an outer rotating shaft, outer side grating sheets, inner side grating sheets, a first uniform grating sheet, a second even grating sheet and photoelectric receiving tubes; the inner rotating shaft is connected with the outer side grating sheets, and when the measuring system runs, the two ends of the inner rotating shaft are respectively connected with a power source and a load; the outer rotating shaft is connected with the inner side grating sheets and can conduct relative motion together with the inner rotating shaft and the outer side grating sheets; the first and the second uniform grating sheets are identical uniform grating sheets; when the inner side grating sheet and the outer side grating sheet conduct relative rotation, sine waves are output by output terminals of the photoelectric receiving tubes, and a phase difference is directly proportional to torque, so that the phase difference is obtained and then the torque can be calculated, thereby obtaining the measured viscosity value through conversion. The measuring system is intelligent and controllable, and multispeed continuous regulation of the rotating speed is realized, thereby greatly increasing the range and the precision of viscosity measurement and providing guarantee for further study of ink printability.

Description

A kind of rotary viscosity measuring system

Technical field

The utility model relates to a kind of rotary viscosity measuring system.

Background technology

Ink viscosity is the important parameter of weighing ink performance, also can affect indirectly the quality of printed matter simultaneously, and therefore ink viscosity being measured accurately and controlled for improving print quality has very important meaning.Traditional mechanical type rotating viscosity meter changes rotating speed by synchronous machine drives by change gear, the rotating speed gear that provides seldom, inconvenient microprocessor processes, the measuring accuracy of instrument is lower, measurement range is restricted.

Summary of the invention

Problem to be solved in the utility model provides a kind of rotary viscosity measuring system.

This rotary viscosity measuring system comprises measure portion, control section and operating part, described measure portion comprises the torque measurement part that grating sensor forms and the temperature survey part that is comprised of temperature sensor, be respectively applied to torque value that detection rotor bears and the temperature value of testing liquid, and be transferred to single-chip microcomputer, as feedback and control information; Described control section is made of the unit control system, as processing and the storage of cental system control related data; Described operating part utilizes software to realize the selection of its many gear rotating speeds by the stepper motor rotor driven; It is characterized in that: described torque measurement partly comprises grating torque transducer, it comprises interior rotating shaft, outer shaft, outside lenticular lenses, inboard lenticular lenses, the first uniform grating sheet, the second uniform grating sheet and photoelectric receiving tube, described interior rotating shaft links to each other with described outside lenticular lenses, when measuring operation, two ends link to each other with load with power source respectively; Described outer shaft links to each other with described inboard lenticular lenses, and can do relative motion with described interior rotating shaft and described outside lenticular lenses together, the first uniform grating sheet and the second uniform grating sheet are identical uniform grating sheets, when described inboard lenticular lenses and described outside lenticular lenses do relative motion, described photoelectric receiving tube output terminal sine wave output, phase differential is directly proportional with torque, therefore obtains phase differential, can calculate torque, thereby converse measured viscosity number.

The utility model beneficial effect: adopt the stepper motor direct driving rotor, this device intelligence is controlled, has greatly improved scope and the precision of viscosity measurement, for the further investigation of ink printability provides guarantee.

Description of drawings

Fig. 1 is two drum type brake rotational viscosimeter schematic diagram;

Fig. 2 is the laminar flow schematic diagram;

Fig. 3 is the grating sensor structural drawing;

Fig. 4 is the measuring system block diagram;

Among the figure, rotating shaft in the 1-, 2-photoemission cell, 3-outside lenticular lenses, the inboard lenticular lenses of 4-, 5-photoelectric receiving tube, 6-outer shaft, A-uniform grating sheet, B-uniform grating sheet.

Embodiment

When fluid and the object (such as the rigid objects of cylinder, circular cone, plectane, ball and other shape) that is immersed the two one of when rotating, object will be subject to the effect of fluid viscous power and change original torque.The rotation ratio juris is exactly the viscosity that the viscosity moment that acts on object by measuring fluid is determined fluid.

Fig. 1 is two drum type brake rotational viscosimeter schematic diagram, and urceolus is the container of containing detected fluid, and its radius is r ₂, it is fixed, and inner core is the rotor that immerses detected fluid, and by the Electric Machine Control rotation, coaxial with urceolus, radius is r ₁, highly be l.

During measurement, inner core is with constant angular velocity omega rotation, and the fluid between two rotates very regularly from level to level, all be some concentric circless perpendicular to the streamline on the Plane of rotation, as shown in Figure 2, the flow velocity v=ω r of r layer fluid then, suffered viscous moment on it:

$M=\frac{4\mathrm{\&pi;\&eta;<figure-callout\; id="1"\; label="l\; r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">l</figure-callout>}{r}_{}^{}{}_1^2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^2\mathrm{\&omega;}}{{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^2-{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^2}---\left(2.1\right)$

Under the condition of viscous moment and countermoment balance, inner core is done uniform rotation, this moment liquid the mobile steady state (SS) that is, the then torque that is subject to of inner core:

$T=M=\frac{4\mathrm{\&pi;\&eta;<figure-callout\; id="1"\; label="l\; r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">l</figure-callout>}{r}_{}^{}{}_1^2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^2\mathrm{\&omega;}}{{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^2-{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^2}---\left(2.2\right)$

Then can derive the viscosity formula:

$\mathrm{\&eta;}=\frac{T({\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^2-{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^2)}{4\mathrm{\&pi;l\&omega;}{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000724788700021.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^2}---\left(2.3\right)$

In the formula: η---fluid viscosity; M---viscous moment; The torque that T---inner core is subject to; r ₁---the inner core radius; r ₂---the urceolus radius; The angular velocity of ω---inner cylinder rotating; The height of l---inner core.

Can be found out l, r by formula (2.3) ₁, r ₂Be known quantity, ω can set as required, and then viscosities il is the function of torque T.So in fact the measurement viscosities il is converted into and measures the torque T that inner core is subject to.

At present, the method for torque measurement mainly contains strain-type, magnetoelasticity formula and corner-type.The device of corner-type torque measuring method is simple, easily realize, output be digital signal, precision is higher, is comparatively desirable sensor type.The utility model is used corner-type torque measurement principle, has designed a kind of grating torque transducer as the data collector of rotary viscosity measuring system, and its structure as shown in Figure 3.

Interior rotating shaft 1 links to each other with outside lenticular lenses 3, and when measuring operation, two ends link to each other with load with power source respectively; Outer shaft 6 links to each other with inboard lenticular lenses 4, and 6 can do relative motion with interior rotating shaft and outside lenticular lenses with 4.

A, B are identical uniform grating sheets.When interior external side light grid sheet does relative motion, photoelectric receiving tube 5 output terminal sine wave outputs.If sensor is unloaded, i.e. T=0, the phase differential between the two is

When torque T ≠ 0, the size of torque is depended in the variation of phase differential.Phase differential is directly proportional with torque, therefore obtains phase differential, can calculate torque, thereby converse measured viscosity number.

Viscosity measuring system is comprised of measure portion, control section and operating part, as shown in Figure 4.

(1) measure portion.Comprise the torque measurement part that formed by grating sensor and by the temperature survey part that temperature sensor forms, be respectively applied to torque value that detection rotor bears and the temperature value of testing liquid, and be transferred to single-chip microcomputer, as feeding back and control information.

(2) control section.Mainly consisted of by the unit control system, as processing and the storage of cental system control related data.

(3) operating part.By the stepper motor rotor driven, utilize software to realize the selection of its many gear rotating speeds.

This device adopts stepper motor direct driving rotor, and its intelligence is controlled, has greatly improved scope and the precision of viscosity measurement, for the further investigation of ink printability provides guarantee.

Claims (1)

1. rotary viscosity measuring system, comprise measure portion, control section and operating part, described measure portion comprises the torque measurement part that is comprised of grating sensor and the temperature survey part that is comprised of temperature sensor, be respectively applied to torque value that detection rotor bears and the temperature value of testing liquid, and be transferred to single-chip microcomputer, as feedback and control information; Described control section is made of single-chip computer control system, as processing and the storage of cental system control related data; Described operating part is by the stepper motor rotor driven; It is characterized in that: described torque measurement partly comprises grating torque transducer, described grating torque transducer comprises interior rotating shaft (1), outer shaft (6), outside lenticular lenses (3), inboard lenticular lenses (4), the first uniform grating sheet (A), the second uniform grating sheet (B) and photoelectric receiving tube (5), described interior rotating shaft (1) links to each other with described outside lenticular lenses (3), when measuring operation, two ends link to each other with load with power source respectively; Described outer shaft (6) links to each other with described inboard lenticular lenses (4), and can do relative motion with described interior rotating shaft and described outside lenticular lenses together, the first uniform grating sheet (A) and the second uniform grating sheet (B) are identical uniform grating sheets, when described inboard lenticular lenses (4) and described outside lenticular lenses (3) when doing relative motion, described photoelectric receiving tube (5) output terminal sine wave output, phase differential is directly proportional with torque, therefore obtain phase differential, can calculate torque, thereby converse measured viscosity number.

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