CN2807248Y - Apparatus for determining liquid viscous coefficient by falling ball method - Google Patents
Apparatus for determining liquid viscous coefficient by falling ball method Download PDFInfo
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- CN2807248Y CN2807248Y CN 200520109310 CN200520109310U CN2807248Y CN 2807248 Y CN2807248 Y CN 2807248Y CN 200520109310 CN200520109310 CN 200520109310 CN 200520109310 U CN200520109310 U CN 200520109310U CN 2807248 Y CN2807248 Y CN 2807248Y
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Abstract
The utility model discloses an apparatus for determining liquid viscous coefficient by a falling ball method. The internal part of a cylindrical transparent cylinder body (2) which is vertically arranged and is filled with liquid (3) which needs to be determined is suspended with a straight ruler (6) which is used for calibrating the falling position of a small ball (4), and the external part of the cylindrical transparent cylinder body is provided with a column-shaped light source (1) which can uniformly illuminate the straight ruler. An image collecting system (7) aligns with the lower part of the cylindrical transparent cylinder body, and the falling process of the collected small ball and the image of the straight ruler are conveyed to a computer (8). After a display (9) of the computer conducts comparison and calculation to each sampling part of the falling process of the small ball and the straight ruler by using a grid method or a cross coordinate method, the epilog speed of the small ball is numerated, and accordingly, the viscous coefficient of the liquid which needs to be determined is numerated. The apparatus makes the measurement of a plurality of times converted into single measurement without arranging and adjusting reference marks and without arranging the vertical state of the adjusting system; the utility model determines the falling speed of the small ball by the image collecting system and the computer, and the measuring accuracy of the system is increased.
Description
Technical field
The utility model relates to a kind of device of measuring coefficient of viscosity, especially the falling ball method coefficient of viscosity analyzer of data being gathered and being handled by image capturing system and computing machine.
Background technology
Known coefficient of viscosity assay method has multiple, and as falling ball method, rock method, rotating-cylinder method, capillary tube technique etc., its corresponding instrument, device are also a lot.In present domestic teaching, scientific research, medical science, engineering and the production technology public falling ball method coefficient of viscosity determinator be cylindrical transparent cylinder body by vertical placement, it is outer and be parallel to the witness marker that two of testing liquid surface can up-down adjustment such as bungee, cotton rope, picture trace to be arranged on cylindrical transparent cylinder body, and density constitutes greater than the bead and the stopwatch of testing liquid.After in cylindrical transparent cylinder body, injecting testing liquid, middle part discharges bead above liquid surface, after bead enters liquid, under the effect of gravity, buoyancy, viscosity resistance, begin to fall, when gravity equals buoyancy and viscosity resistance sum, bead can be in the uniform speed motion state in testing liquid, therewith the speed of uniform speed motion state's correspondence we be called terminal velocity, by terminal velocity and be aided with the coefficient of viscosity that other parameters can be calculated testing liquid.In order to determine whether bead reaches terminal velocity, method has two: the first allows bead respectively at liquid level place and a certain height place's free-falling that is higher than liquid level, when measuring bead and in liquid, fall with stopwatch through time of two witness markers, if measuring the gained time for twice equates, illustrate that then bead has reached the uniform speed motion state in testing liquid, measure the spacing of two witness markers, can obtain the terminal velocity of bead.Do not wait if measure the gained time for twice, the description references sign is higher, needs to regulate witness marker downwards, repeats experiment, till obtaining terminal velocity; It two is to allow bead respectively at twice of the sustained height place free-falling of liquid level top, measure a bead after the time through two witness markers with stopwatch, regulate two witness markers downwards and keep its spacing constant, measure the time of bead once more through two witness markers, equate if measure the gained time for twice, illustrate that then bead has reached the uniform speed motion state in testing liquid.Do not wait if measure the gained time for twice, the description references sign is higher, needs to regulate witness marker downwards, repeats experiment, till obtaining terminal velocity.Owing to adopt manual stopwatch Measuring Time, when having only spacing when two witness markers enough big, time measurement could be accurately, this with regulate witness marker acquisition terminal velocity formation contradiction downwards, more need to regulate repeatedly just and can obtain more satisfactory data.Public falling ball method coefficient of viscosity determinator need repeat experiment and could obtain terminal velocity at present, makes troubles to measurement; Owing to adopt range estimation to judge position and the manual manual time-keeping of bead, measurement data produced than mistake with respect to witness marker.
The utility model patent instructions ZL of the State Intellectual Property Office of the People's Republic of China patent No. 02215782.4 (January 1 2003 Granted publication day) discloses and has a kind ofly adopted laser light electric switch alternative reference sign and be aided with the falling ball method coefficient of viscosity analyzer of single-chip microcomputer as timing tool, it still needs the up-down adjustment photogate, to guarantee when obtaining terminal velocity, to keep the maximum spacing of two pairs of photogate, the angle that also will regulate two pairs of photogate laser beam enables the direct projection plumb line, intersects with whereabouts track and the photogate laser beam that guarantees bead.
Summary of the invention
The technical problems to be solved in the utility model provide a kind of simple to operate, the bead that falls in testing liquid is carried out the falling ball method coefficient of viscosity analyzer that single measurement can accurately be measured its terminal velocity and extrapolate this coefficient of viscosity.
The technical scheme that its technical matters that solves the utility model adopts is: hang one in order to demarcate the ruler of position, bead whereabouts in the cylindrical transparent cylinder body of vertical placement and injection testing liquid, the upper end of ruler has a hole, hang over to link up with and go up and maintenance nature hang, the scale face of ruler is perpendicular to the outer tangent plane of cylindrical transparent cylinder body.A columnar light source is placed in the outside of cylindrical transparent cylinder body, evenly illuminates ruler.Image capturing system is to the bottom of the transparent cylinder body of quasi-cylindrical, the bead dropping process of gathering and the image of ruler are sent to computing machine, on its display, adopt gridding method or cross coordinate method that each sampling location and the ruler of bead dropping process are compared calculating by computing machine, try to achieve the terminal velocity that bead falls and the coefficient of viscosity of calculating testing liquid thus in testing liquid.
The beneficial effects of the utility model are: need not to be provided with, to regulate witness marker, need not the plumbness of regulating system, become single measurement repeatedly measuring, simplified measuring process, by image capturing system and computing machine the speed that bead falls in testing liquid is measured, improved the measuring accuracy of system.
Description of drawings
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural representation of the utility model falling ball method coefficient of viscosity analyzer.
Fig. 2 is the synoptic diagram that the utility model falling ball method coefficient of viscosity analyzer adopts gridding method that data are handled.
Fig. 3 is the synoptic diagram that the utility model falling ball method coefficient of viscosity analyzer adopts the cross coordinate method that data are handled.
Embodiment
In falling ball method coefficient of viscosity analyzer shown in Figure 1, the cylindrical transparent cylinder body 2 of vertical placement and injection testing liquid 3 can select for use glass, quartz, transparent organic glass material to make, consider corrosion-resistant and purchase factors such as convenient, recommend to use cylindrical biological sample cylinder.Being suspended in the cylindrical transparent cylinder body 2 can select for use stainless steel, copper or stupalith to make in order to the ruler 6 of demarcating position, bead whereabouts, its reason is that normally used bead 4 is steel ball, it contains certain magnetic, if use the ruler of ferromagnetic material, both attractive forces certainly will influence the whereabouts track of bead 4.The upper end of ruler 6 has a hole, is convenient to hang.Ruler 6 should not be too thick in addition, and its thickness should be less than 1mm, otherwise can influence flowing of testing liquid 3, and stainless steel finished product ruler is adopted in suggestion, and thickness is more suitable.Hook 5 adopts two stainless steels or copper sheet to be welded, the top hook is convenient to hang over the upper edge of cylindrical transparent cylinder body 2, the bottom is fixed with right cylinder or the screw that copper or stainless steel material are made, its diameter is less than the diameter of ruler 6 upper end circular holes, be convenient to hang or take off the height that ruler 6 is measured liquid level, because hook 5 is simple in structure, the utility model no longer provides its structural drawing.The inner bottom surface of the lower end of ruler 6 and cylindrical transparent cylinder body 2 leaves certain interval, makes ruler 6 be in nature hang and parallel with the track of bead 4 whereabouts.As A among Fig. 1 to shown in the enlarged drawing, the scale face of ruler 6 should be perpendicular to the outer tangent plane of cylindrical transparent cylinder body 2, make testing liquid 3 resistance minimum when center flow, track that bead 4 falls and ruler 6 scale faces are coexisted in the same plane, with the image that ensures bead 4 that image capturing system 7 is obtained and ruler 6 not because of the different differences that cause the imaging yardstick of front and back position, because bigger from image capturing system 7 nearly person's imagings.A no stroboscopic columnar light source 1 is placed in the outside of cylindrical transparent cylinder body 2, evenly illuminates ruler 6.The bottom of 7 pairs of transparent cylinder bodies 2 of quasi-cylindrical of image capturing system and the track that falls over against bead 4 and the plane of ruler 6 scale faces coexistence, aperture and the focal length of regulating image capturing system 7 make the ruler clearly that obtains on display 9 as shown in Figure 3 as 11.When bead 4 middle part above liquid level is released and falls, start the data acquisition function of computing machine 8, collection finishes, on its display 9, adopt gridding method or cross coordinate method that each sampling location and the ruler of bead 4 dropping process are relatively calculated as 11 by computing machine 8, can try to achieve the terminal velocity that bead 4 falls in testing liquid 3, and calculate the coefficient of viscosity of testing liquid 3 thus.Computing machine 8 and display 9 should have the resolution more than 1024 * 768.Image capturing system 7 can adopt CCD industrial camera, high Definition CCD industrial detection dedicated video camera or civilian digital camera, at present domestic have many companies can provide the said goods to reach and supporting video processing board-card, software development program and the technical support of the said goods, guarantees that those of ordinary skill in the art can realize the image acquisition relevant with the utility model, data transmission and computer programming.Because the coefficient of viscosity difference of testing liquid 3, also different to the requirement of bead 4 materials, the material of bead 4 can be steel, glass, plastics etc.
Fig. 2 is the synoptic diagram that the utility model adopts gridding method that data are handled, and is that example is illustrated with CCD industrial camera and standard video format thereof only herein.The bead 4 whereabouts images of being gathered by the CCD industrial camera send computing machine 8 and preservation to per second 25 frames, after data acquisition is finished, when each two field picture of preserving being reproduced on display 9 in order by computing machine 8, on display 9, draw the grid that full water is flat, vertical direction equates and do not change with image transformation its position at interval by computing machine 8, the every crawl of computer mouse once, image is conversion one frame in order.Click the mouse continuously, when occurring the picture of bead 4 on the display 9, write down the lattice number of bead as 10 places, click the mouse once, the metering bead is as the 10 lattice numbers that move, click the mouse once, measure bead as the 10 lattice numbers that move ..., equate as the 10 lattice numbers that move up to each bead, illustrate that this moment, bead 4 entered the uniform speed motion state, can begin to measure terminal velocity.Suppose that solid line bead shown in Figure 2 has entered the uniform speed motion state as 10, write down the solid line bead as the ruler of 10 place grid position correspondences as 11 scale, click the mouse once, bead is as 10 positions that move to the dotted line bead, the ruler of writing down dotted line bead place grid position correspondence is as 11 scale, the ruler that reads for twice subtracts each other as 11 scale, can obtain the actual range that bead 4 falls, and the CCD industrial camera to gather the interval time of two width of cloth images be 1/25 second, the actual range of whereabouts can be obtained the terminal velocity of bead 4 divided by interval time.In order to improve measuring accuracy, can write down more several beads as 10 at the ruler of different grid position correspondences as 11 scale, adopt and knownly data handled by the difference method.In order to utilize display 9 lateral dimensions to obtain more data greater than the design feature of vertical size, the CCD industrial camera should revolve and turn 90 degrees use, and the ruler that the level as shown in Figure 2 that so can obtain shows is as 11.When practical adjustments CCD industrial camera, be difficult to guarantee that ruler as 11 and the grid absolute parallel, can utilize trigonometric function to obtain the actual range that bead 4 falls by the level and the vertical curve of grid.
Fig. 3 is the synoptic diagram that the utility model adopts the cross coordinate method that data are handled.Since gridding method shown in Figure 2 can not with the pixel number of display 9 accurately judge bead as the corresponding ruler of 10 place grid positions and this position as 11 scale, so can adopt cross coordinate method shown in Figure 3 that data are handled.Always there is the cross curve retinue cursor place of arrival on the display 9, and the XY coordinate values of while display highlighting on display 9.When cursor refers at bead during as 10 positions, the vertical line of cross curve refer to simultaneously ruler as 11 scale on, readability very directly perceived.Its shortcoming is to judge when whether bead enters the uniform speed motion state as 10, carry out coordinate values and calculate, and grid is not convenient in full.
Claims (3)
1. falling ball method coefficient of viscosity analyzer, comprise that vertical placement is in order to store the cylindrical transparent cylinder body of testing liquid, density is greater than the bead of testing liquid, it is characterized in that: it also has a ruler (6) that is suspended on cylindrical transparent cylinder body (2) in by hook (5) in order to demarcation bead (4) position, whereabouts, one is placed on outside the cylindrical transparent cylinder body (2) in order to evenly to illuminate the light source (1) of ruler (6) and whereabouts bead (4), one cover is gathered the image capturing system (7) of bead (4) dropping process and ruler (6) image, and the image that image capturing system (7) is gathered is processed the computing machine (8) of handling and going up reproduction bead picture (10) and ruler picture (11) at its display (9).
2. according to the described falling ball method coefficient of viscosity of claim 1 analyzer, it is characterized in that: the upper end of described ruler (6) has a hole, is used to hang ruler.
3. according to the described falling ball method coefficient of viscosity of claim 1 analyzer, it is characterized in that: what described light source (1) adopted is columnar light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520109310 CN2807248Y (en) | 2005-06-02 | 2005-06-02 | Apparatus for determining liquid viscous coefficient by falling ball method |
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| CN 200520109310 CN2807248Y (en) | 2005-06-02 | 2005-06-02 | Apparatus for determining liquid viscous coefficient by falling ball method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813598A (en) * | 2010-03-30 | 2010-08-25 | 华南师范大学 | Viscosity coefficient measurement method based on photoacoustic effect |
| CN101339184B (en) * | 2008-08-20 | 2012-02-08 | 燕山大学 | Self-compacting mortar working performance tester and test method |
| CN103293081A (en) * | 2013-05-30 | 2013-09-11 | 河海大学 | Test device and method for observing flow characteristic of high-pore-pressure-ratio liquefied sandy soil |
| CN103792164A (en) * | 2014-01-17 | 2014-05-14 | 常州大学 | Method and device for measuring influence rule of motion characteristic of bubbles on liquid-phase viscosity |
| CN104359796A (en) * | 2014-11-21 | 2015-02-18 | 无锡悟莘科技有限公司 | System for measuring liquid viscosity |
| CN105319150A (en) * | 2015-11-23 | 2016-02-10 | 重庆医科大学 | Liquid viscosity coefficient measurement method and device based on linear array CCD |
| CN109253945A (en) * | 2018-11-23 | 2019-01-22 | 大连民族大学 | A kind of transparency liquid alternating temperature adhesive tape coefficient measuring device based on video |
| CN109253946A (en) * | 2018-11-23 | 2019-01-22 | 大连民族大学 | A kind of transparency liquid alternating temperature adhesive tape coefficient measuring method based on video |
| CN111912745A (en) * | 2020-08-11 | 2020-11-10 | 湘潭大学 | Method for measuring liquid viscosity through dripping experiment |
| CN114441382A (en) * | 2021-07-13 | 2022-05-06 | 台湾塑胶工业股份有限公司 | Viscosity measuring device and viscosity measuring method |
| CN114544432A (en) * | 2022-02-25 | 2022-05-27 | 安徽农业大学 | Liquid viscosity coefficient measuring device |
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2005
- 2005-06-02 CN CN 200520109310 patent/CN2807248Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339184B (en) * | 2008-08-20 | 2012-02-08 | 燕山大学 | Self-compacting mortar working performance tester and test method |
| CN101813598A (en) * | 2010-03-30 | 2010-08-25 | 华南师范大学 | Viscosity coefficient measurement method based on photoacoustic effect |
| CN103293081B (en) * | 2013-05-30 | 2016-05-25 | 河海大学 | A kind of experimental rig and method of observing high hole pressure ratio liquefied sand flow behavior |
| CN103293081A (en) * | 2013-05-30 | 2013-09-11 | 河海大学 | Test device and method for observing flow characteristic of high-pore-pressure-ratio liquefied sandy soil |
| CN103792164A (en) * | 2014-01-17 | 2014-05-14 | 常州大学 | Method and device for measuring influence rule of motion characteristic of bubbles on liquid-phase viscosity |
| CN104359796A (en) * | 2014-11-21 | 2015-02-18 | 无锡悟莘科技有限公司 | System for measuring liquid viscosity |
| CN105319150A (en) * | 2015-11-23 | 2016-02-10 | 重庆医科大学 | Liquid viscosity coefficient measurement method and device based on linear array CCD |
| CN109253945A (en) * | 2018-11-23 | 2019-01-22 | 大连民族大学 | A kind of transparency liquid alternating temperature adhesive tape coefficient measuring device based on video |
| CN109253946A (en) * | 2018-11-23 | 2019-01-22 | 大连民族大学 | A kind of transparency liquid alternating temperature adhesive tape coefficient measuring method based on video |
| CN111912745A (en) * | 2020-08-11 | 2020-11-10 | 湘潭大学 | Method for measuring liquid viscosity through dripping experiment |
| CN111912745B (en) * | 2020-08-11 | 2023-10-24 | 湘潭大学 | Method for measuring viscosity of liquid through dripping experiment |
| CN114441382A (en) * | 2021-07-13 | 2022-05-06 | 台湾塑胶工业股份有限公司 | Viscosity measuring device and viscosity measuring method |
| EP4119921A1 (en) * | 2021-07-13 | 2023-01-18 | Formosa Plastics Corporation | Viscosity measurement device and method for measuring viscosity |
| TWI810607B (en) * | 2021-07-13 | 2023-08-01 | 臺灣塑膠工業股份有限公司 | Viscosity measurement device and method for measuring viscosity |
| CN114544432A (en) * | 2022-02-25 | 2022-05-27 | 安徽农业大学 | Liquid viscosity coefficient measuring device |
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| CF01 | Termination of patent right due to non-payment of annual fee |