CN106990021B - Roll-off type viscosity automatic measurement device and method - Google Patents
Roll-off type viscosity automatic measurement device and method Download PDFInfo
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- CN106990021B CN106990021B CN201710389712.0A CN201710389712A CN106990021B CN 106990021 B CN106990021 B CN 106990021B CN 201710389712 A CN201710389712 A CN 201710389712A CN 106990021 B CN106990021 B CN 106990021B
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- 238000005259 measurement Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 17
- 239000007788 liquid Substances 0.000 claims abstract description 49
- 238000004321 preservation Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000691 measurement method Methods 0.000 claims abstract description 7
- 239000007769 metal material Substances 0.000 claims description 4
- 239000012085 test solution Substances 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 description 13
- 239000000126 substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009878 intermolecular interaction Effects 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 210000002966 serum Anatomy 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/12—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring rising or falling speed of the body; by measuring penetration of wedged gauges
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Abstract
The invention relates to a roll-off type automatic viscosity measuring device which comprises a supporting frame, a heat preservation sleeve, a water bath connecting pipe, a thermometer, a liquid testing pipe, a first proximity sensor, a second proximity sensor, a keyboard, a display screen, a control main board and a plurality of measuring balls, wherein the heat preservation sleeve is arranged on the supporting frame, the water bath connecting pipe is communicated with the heat preservation sleeve, the thermometer stretches into the heat preservation sleeve, the liquid testing pipe penetrates through the heat preservation sleeve and is obliquely arranged, the control main board is connected with the first proximity sensor and the second proximity sensor through a first group of I/O interfaces, the control main board is connected with the keyboard through a second group of I/O interfaces, and the control main board is connected with the display screen through a third group of I/O interfaces. The invention also relates to a roll-off type automatic viscosity measurement method. The timing point is accurate, and the error is small; the automatic measurement is the same at each measurement time and measurement precision, and the repeatability is good; the viscosity is automatically calculated and displayed, so that the complicated manual calculation and possible errors are avoided.
Description
Technical Field
The invention relates to the field of liquid viscosity measurement, in particular to a roll-off type automatic viscosity measurement device and method.
Background
The viscosity of liquids such as latex, serum, sugar liquor, wine and macromolecular polymers of certain formulations is one of the fundamental properties of many products in the chemical and food industries. Common viscosity measurement methods are capillary, spin and ball drop methods. Capillary methods generally have a long response time and are prone to clogging by small particles in the liquid. The rotary method has low measurement accuracy and can break the intermolecular interactions. The falling ball method has moderate response time, the measuring ball slowly moves at a uniform speed in the liquid, the interaction among liquid molecules is not destroyed, and the viscosity of the liquid under static state can be objectively and accurately reflected, so the falling ball method is widely used in the industries of chemical industry, food and the like.
The roll-off viscosity measurement method is to roll off a measuring ball from an inclined tube filled with a test solution along the tube wall, the roll-off speed is proportional to the viscosity, and the roll-off speed of the measuring ball is used for obtaining the viscosity. Conventionally, several marked lines with the same distance are marked on the wall of the measuring tube, and a stopwatch is used to record the time interval between the passing of the small ball through the marked lines in sequence, so that the measurement of the speed is converted into the measurement of the time. After the time is recorded, substituting the inclination angle of the liquid tube, the diameter and density of the small ball, the density and time of the measured liquid into corresponding empirical formulas to obtain the relative viscosity of the measured liquid. The most commonly used roll-off ball-drop viscometer is a Huo Bole ball-drop viscometer, and in order to make the measurement as accurate as possible, three marked lines with the same distance are marked on the wall of a measuring tube so as to increase the data quantity of the measured time interval, and the measurement error is very large and almost impossible to measure for opaque liquid because of adopting a stopwatch for visual measurement. The Rus-card falling ball viscometer is also a rolling-ball viscometer, the measuring tube is filled with measured liquid, the measuring tube is rotatable, the upper bottom wheel flow and the lower bottom wheel flow are used as the bottom of the measuring tube, the time spent by rolling an electronic measuring small ball from top to bottom is used, the measuring time is accurate, the influence of the upper bottom and the lower bottom is large, the rolling-ball viscometer comprises a non-uniform running stage, errors cannot be avoided in principle, and the measuring precision is not high.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides the roll-off type automatic viscosity measuring device and the roll-off type automatic viscosity measuring method, which can be used for accurately, automatically and quickly measuring the viscosity of various high-viscosity liquids and have the advantages which are not possessed by other measuring devices and methods for measuring the viscosity of opaque liquids.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a roll-off viscosity automatic measuring device, includes support frame, insulation cover, water bath connecting pipe, thermometer, test tube, first proximity sensor, second proximity sensor, keyboard, display screen, control mainboard and a plurality of measuring ball, the insulation cover is installed on the support frame, the water bath connecting pipe with the insulation cover is linked together, the thermometer stretches into in the insulation cover, the test tube runs through insulation cover and slope setting, the control mainboard through first group I/O interface with first proximity sensor, second proximity sensor are connected, the control mainboard through second group I/O interface with the keyboard is connected, the control mainboard through third group I/O interface with the display screen is connected.
In a preferred embodiment of the present invention, a roll-off type automatic viscosity measuring apparatus further includes the first proximity sensor and the second proximity sensor mounted on the same side outer wall of the test tube.
In a preferred embodiment of the present invention, a roll-off type automatic viscosity measuring apparatus further includes the sensing surface of the first proximity sensor and the sensing surface of the second proximity sensor being in the same plane.
In a preferred embodiment of the present invention, the automatic roll-off viscosity measurement device further includes a sensing surface of the first proximity sensor and a sensing surface of the second proximity sensor both cling to the test tube and are parallel to an axis of the test tube.
In a preferred embodiment of the present invention, a roll-off type automatic viscosity measuring apparatus further includes the first proximity sensor and the second proximity sensor each mounted at an intermediate section of the test tube.
In a preferred embodiment of the present invention, a roll-off type automatic viscosity measuring apparatus further includes a mounting distance between the first proximity sensor and the second proximity sensor is not less than 50mm.
In a preferred embodiment of the present invention, a roll-off type automatic viscosity measuring apparatus further includes the measuring ball made of a metal material.
The automatic roll-off viscosity measurement method is characterized by comprising the following steps of:
(1) Measuring the inclination angle theta between the liquid tube and the horizontal plane, the inner diameter D of the liquid tube, the diameter D of the measuring ball, and calculating the density of the measuring ballDegree ρ b And the density ρ of the measured liquid;
(2) Carrying out water bath on the heat preservation sleeve to adjust the temperature, waiting until the temperature meets the measurement requirement, and starting a power supply;
(3) According to the prompt given by the display screen, the inclination angle theta between the liquid test tube and the horizontal plane, the inner diameter D of the liquid test tube, the diameter D of the measuring ball and the density rho of the measuring ball are input through the keyboard b And the density rho of the measured liquid, and confirming;
(4) The measuring ball freely rolls along the inner tube wall of the liquid test tube and sequentially passes through the measuring areas of the first proximity sensor and the second proximity sensor, the positions of the measuring ball which just enters and completely exits the measuring areas of the first proximity sensor are respectively marked as A, B, the positions of the measuring ball which just enters and completely exits the measuring areas of the second proximity sensor are respectively marked as C, D, and the time t of four points is respectively recorded in an interrupt mode A 、t B 、t C 、t D ；
(5) The control main board calculates the speed V of the measuring ball passing through the distance of AC AC Speed V at this distance from BD BD When V AC And V is equal to BD Difference and velocity average V Average of Is less than or equal to 1% and the velocity average V Average of When the viscosity is less than or equal to 1.67mm/s, the viscosity of the liquid is calculated by using a corresponding viscosity formula when the measurement condition is considered to be satisfied; otherwise, the measuring ball is considered to not meet the measuring condition, a corresponding prompt is given through the display screen, and the measuring ball is replaced to measure again.
In a preferred embodiment of the present invention, a roll-off viscosity automatic measurement method further includes performing a program initialization stage before performing the step (1), defining an output interface for connecting the control motherboard to the display screen, an input interface for connecting to the keyboard, an interrupt input interface for connecting to the first proximity sensor and the second proximity sensor, setting an interrupt mode triggered by upper and lower edges, and enabling the interrupt.
The invention has the following beneficial effects:
(1) The first proximity sensor and the second proximity sensor are sensitive in reaction, the measuring point is arranged as the middle section of the liquid test tube, errors are eliminated, an electronic automatic induction method is adopted for timing, various measuring errors and random errors of stopwatch timing are eliminated, the timing point is accurate, and the errors are small;
(2) The automatic measurement is the same at each measurement time and measurement precision, and the repeatability is good;
(3) If the selection of the measuring ball is improper, the display screen prompts the re-selection of the measuring ball for measurement, so that erroneous judgment is avoided;
(4) The viscosity is automatically calculated and displayed, so that the complicated manual calculation and possible errors are avoided;
(5) The method can be used for accurately measuring the viscosity of various high-viscosity liquids, has the advantages which are not possessed by other measuring methods for measuring opaque liquids, and has wide prospects in the chemical industry;
(6) The viscosity meter can be applied to not only rolling-down, straight-down, lifting ball and other viscosity meters for viscosity measurement based on the falling method, but also other viscosity measuring instruments for viscosity measurement based on the falling method.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic structural view of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the working principle of a preferred embodiment of the present invention;
FIG. 3 is a workflow diagram of a preferred embodiment of the present invention;
in the figure: 2. the device comprises a support frame, 4, a thermal insulation sleeve, 6, a water bath connecting pipe, 8, a thermometer, 10, a test solution pipe, 12, a first proximity sensor, 14, a second proximity sensor, 16, a keyboard, 18, a display screen, 20, a control main board, 22, a measuring ball, 24, a first group of I/O interfaces, 26, a second group of I/O interfaces, 28 and a third group of I/O interfaces.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples, which are simplified schematic illustrations of the basic structure of the invention, which are presented only by way of illustration, and thus show only the structures that are relevant to the invention.
As shown in fig. 1 and 2, the automatic roll-off viscosity measuring device comprises a supporting frame 2, a heat insulation sleeve 4, a water bath connecting pipe 6, a thermometer 8, a liquid test pipe 10, a first proximity sensor 12, a second proximity sensor 14, a keyboard 16, a display screen 18, a control main board 20 and a plurality of measuring balls 22, wherein the heat insulation sleeve 4 is sealed at the periphery and hollow inside, the heat insulation sleeve 4 is arranged on the supporting frame 2, the water bath connecting pipe 6 is communicated with the heat insulation sleeve 4, the thermometer 8 stretches into the heat insulation sleeve 4 and is used for measuring the water bath temperature in the heat insulation sleeve 4, the liquid test pipe 10 penetrates through the heat insulation sleeve 4 and is obliquely arranged, the first proximity sensor 12 and the second proximity sensor 14 are used for detecting whether the measuring balls 22 enter an induction area or not and are sensitive in response, the control main board 20 is connected with the first proximity sensor 12 and the second proximity sensor 14 through a first group of I/O interfaces 24, the control main board 20 is connected with the keyboard 16 through a third group of I/O interfaces 28, and the control main board 20 is connected with the display screen 18 through a second group of I/O interfaces 28.
In order to accurately sense the measuring ball 22 and improve the measurement accuracy, the first proximity sensor 12 and the second proximity sensor 14 are preferably mounted on the same side outer wall of the test tube 10. It is further preferred that the sensing surface of the first proximity sensor 12 and the sensing surface of the second proximity sensor 14 are in the same plane. The sensing surface of the first proximity sensor 12 and the sensing surface of the second proximity sensor 14 are both in close contact with the test tube 10 and parallel to the axis of the test tube 10. The first proximity sensor 12 and the second proximity sensor 14 are each installed at the middle section of the test tube 10. The mounting distance L between the first proximity sensor 12 and the second proximity sensor 14 is not less than 50mm.
In order to increase the reaction speed of the first proximity sensor 12 and the second proximity sensor 14, the measuring ball 22 is preferably made of a metal material, and the first proximity sensor 12 and the second proximity sensor 14 can instantaneously sense the measuring ball 22 made of the metal material.
As shown in fig. 3, the measuring method based on the roll-off type automatic viscosity measuring device comprises the following steps:
(1) In the program initialization stage, an output interface of the control main board 20 connected to the display screen 18, an input interface connected to the keyboard 16, and interrupt input interfaces connected to the first proximity sensor 12 and the second proximity sensor 14 are defined, an interrupt mode triggered by upper and lower edges is set, and interrupt is enabled;
(2) Measuring the inclination angle θ between the liquid sample tube 10 and the horizontal plane, the inner diameter D of the liquid sample tube 10, the diameter D of the measuring ball 22, and calculating the density ρ of the measuring ball 22 b And the density ρ of the measured liquid; specifically, the inclination angle θ between the test tube 10 and the horizontal plane can be measured according to GB/T10247-2008 "viscosity measurement method", which is generally designed to be 80 °, the diameter D of the test tube 10 and the diameter D of the measurement ball 22 can be measured by a vernier caliper, and the density ρ of the measurement ball 22 is measured b The density ρ of the measured liquid is obtained by the ratio of the mass of the measured liquid to the volume of the measured liquid by the ratio of the mass of the measured ball 22 to the volume of the measured ball 22;
(3) Carrying out water bath on the heat preservation sleeve 4 to adjust the temperature, waiting until the temperature meets the measurement requirement, and starting a power supply;
(4) According to the prompt given by the display screen 18, the inclination angle theta of the test tube 10, the inner diameter D of the test tube 10, the diameter D of the measuring ball 22 and the density ρ of the measuring ball 22 are input through the keyboard 16 b And the density rho of the measured liquid, and confirming;
(5) The measuring ball 22 is made to roll freely along the inner tube wall of the test tube 10 and pass through the measuring areas of the first proximity sensor 12 and the second proximity sensor 14 in sequence, signals are immediately sent to the control main board 20, the positions of the measuring ball 22 which just enters and completely exits the measuring areas of the first proximity sensor 12 are respectively marked as A, B, the positions of the measuring ball 22 which just enters and completely exits the measuring areas of the second proximity sensor 14 are respectively marked as C, D, and the time t of four points is respectively recorded in an interrupt mode A 、t B 、t C 、t D ；
(6) The control main board 20 calculates the speed V of the measuring ball 22 passing the AC distance AC Speed V at this distance from BD BD ，V AC =L AC /（t C -t A ），V BD =L BD /（t D -t B ），L AC = L BD L, L is the mounting distance of the first proximity sensor 12 and the second proximity sensor 14, when V AC And V is equal to BD Difference and velocity average V Average of Is less than or equal to 1% and the velocity average V Average of When the viscosity is less than or equal to 1.67mm/s, the viscosity of the liquid is calculated by using a corresponding viscosity formula when the measurement condition is considered to be satisfied; otherwise, the measuring ball 22 is not considered to move slowly and uniformly, the measuring ball 22 is considered to not meet the measuring condition, a corresponding prompt is given through the display screen 18, and the measuring ball is replaced to carry out measurement again. Wherein V is Average of =（V AC +V BD ) The viscosity was calculated as:。
the above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the person skilled in the art without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (7)
1. The utility model provides a roll-off type viscosity automatic measuring device which characterized in that: the intelligent temperature control device comprises a support frame, a heat preservation sleeve, a water bath connecting pipe, a thermometer, a liquid test pipe, a first proximity sensor, a second proximity sensor, a keyboard, a display screen, a control main board and a plurality of measuring balls, wherein the heat preservation sleeve is arranged on the support frame, the water bath connecting pipe is communicated with the heat preservation sleeve, the thermometer stretches into the heat preservation sleeve, the liquid test pipe penetrates through the heat preservation sleeve and is obliquely arranged, the control main board is connected with the first proximity sensor and the second proximity sensor through a first group of I/O interfaces, the control main board is connected with the keyboard through a second group of I/O interfaces, and the control main board is connected with the display screen through a third group of I/O interfaces;
the first proximity sensor and the second proximity sensor are both arranged at the middle section of the test solution tube;
the measuring method of the roll-off type automatic viscosity measuring device comprises the following steps of:
(1) Measuring an inclination angle theta between the liquid test tube and the horizontal plane, an inner diameter D of the liquid test tube and a diameter D of the measuring ball, and calculating the density ρb of the measuring ball and the density ρ of the measured liquid;
(2) Carrying out water bath on the heat preservation sleeve to adjust the temperature, waiting until the temperature meets the measurement requirement, and starting a power supply;
(3) According to the prompt given by the display screen, inputting an inclination angle theta between the liquid test tube and the horizontal plane, the inner diameter D of the liquid test tube, the diameter D of the measuring ball, the density ρb of the measuring ball and the density ρ of the measured liquid through a keyboard, and confirming;
(4) The measuring ball freely rolls down along the inner tube wall of the liquid test tube and sequentially passes through the measuring areas of the first proximity sensor and the second proximity sensor, the positions of the measuring ball which just enters and completely exits from the measuring areas of the first proximity sensor are respectively marked as A, B, the positions of the measuring ball which just enters and completely exits from the measuring areas of the second proximity sensor are respectively marked as C, D, and the moments tA, tB, tC, tD of four points are respectively recorded in an interrupt mode;
(5) The control main board automatically calculates the speed VBD of the measuring ball passing through the distance VAC and BD of the distance AC, when the ratio of the difference between VAC and VBD to the speed average value Vaverage is less than or equal to 1 percent and the speed average value Vaverage is less than or equal to 1.67mm/s, the measuring condition is considered to be satisfied, and the viscosity of the liquid is calculated by using a corresponding viscosity formula; otherwise, the measuring ball is considered to not meet the measuring condition, a corresponding prompt is given through the display screen, and the measuring ball is replaced to measure again.
2. The roll-off viscosity automatic measuring apparatus according to claim 1, wherein: the first proximity sensor and the second proximity sensor are arranged on the outer wall of the same side of the test liquid tube.
3. The roll-off viscosity automatic measuring apparatus according to claim 2, wherein: the sensing surface of the first proximity sensor and the sensing surface of the second proximity sensor are in the same plane.
4. A roll-off viscosity automatic measuring apparatus according to claim 3, wherein: the sensing surface of the first proximity sensor and the sensing surface of the second proximity sensor are clung to the test liquid tube and are parallel to the axis of the test liquid tube.
5. The roll-off viscosity automatic measuring apparatus according to claim 1, wherein a mounting distance between the first proximity sensor and the second proximity sensor is not less than 50mm.
6. The automatic roll-off viscosity measuring device according to claim 1, wherein the measuring ball is made of a metal material.
7. The automatic roll-off viscosity measurement method according to claim 1, wherein before the step (1), a program initialization stage is performed, an output interface of a control main board connected to a display screen, an input interface connected to a keyboard, an interrupt input interface connected to a first proximity sensor and a second proximity sensor are defined, an interrupt mode triggered by upper and lower edges is set, and interrupts are enabled.
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| CN109946201A (en) * | 2017-12-20 | 2019-06-28 | 邓前军 | A kind of falling ball viscometer device of glass tube connection metal conversion pipe fitting |
| CN110296910A (en) * | 2019-06-28 | 2019-10-01 | 内蒙古科技大学 | A kind of approach switch sensor measurement coefficient of viscosity measuring instrument |
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| CN87107996A (en) * | 1986-11-28 | 1988-06-08 | 株式会社阿真 | The device of Measuring Object movement velocity |
| CN1070479A (en) * | 1992-09-04 | 1993-03-31 | 中国矿业大学 | Oil viscosity measuring method and device |
| CN203310721U (en) * | 2013-05-27 | 2013-11-27 | 吴春艳 | Closed constant temperature viscometer |
| CN203551433U (en) * | 2013-09-03 | 2014-04-16 | 黄河科技学院 | Experimental device for measuring liquid viscosity coefficient at different temperatures |
| CN104330337A (en) * | 2014-10-28 | 2015-02-04 | 成都创源油气技术开发有限公司 | Tool for rapidly and precisely testing viscosity of liquid |
| CN106018179A (en) * | 2016-03-17 | 2016-10-12 | 青岛科技大学 | Glue material surface viscosity measurement method and device based on image processing |
| CN206787976U (en) * | 2017-05-27 | 2017-12-22 | 苏州工业职业技术学院 | A kind of roll-down type viscosity self-operated measuring unit |
-
2017
- 2017-05-27 CN CN201710389712.0A patent/CN106990021B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87107996A (en) * | 1986-11-28 | 1988-06-08 | 株式会社阿真 | The device of Measuring Object movement velocity |
| CN1070479A (en) * | 1992-09-04 | 1993-03-31 | 中国矿业大学 | Oil viscosity measuring method and device |
| CN203310721U (en) * | 2013-05-27 | 2013-11-27 | 吴春艳 | Closed constant temperature viscometer |
| CN203551433U (en) * | 2013-09-03 | 2014-04-16 | 黄河科技学院 | Experimental device for measuring liquid viscosity coefficient at different temperatures |
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