CN206258342U - Rotation viscometer - Google Patents
Rotation viscometer Download PDFInfo
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- CN206258342U CN206258342U CN201621397906.2U CN201621397906U CN206258342U CN 206258342 U CN206258342 U CN 206258342U CN 201621397906 U CN201621397906 U CN 201621397906U CN 206258342 U CN206258342 U CN 206258342U
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- tumbler
- leading screw
- supporting plate
- rotation
- axial direction
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Abstract
The utility model is related to liquid viscosity measuring engineering device technique field, more particularly, to a kind of rotation viscometer, including supporting plate, leading screw and tumbler, tumbler and leading screw worm drive, so that tumbler can around the axial direction rotation of leading screw while, and along leading screw axial direction move；Tumbler is installed on supporting plate, and tumbler along leading screw axial direction move when, tumbler can drive supporting plate along leading screw axial direction move；Also include actuator, for driving tumbler around the axial direction rotation of leading screw.The characteristics of rotation viscometer that the utility model is provided has the height that accurately can easily adjust supporting plate.
Description
Technical field
The utility model is related to liquid viscosity measuring engineering device technique field, more particularly, to a kind of rotation viscometer.
Background technology
When rheology testing is carried out to drilling fluid, to use to a kind of six fast rotation viscometers.
When drilling fluid rheology is measured, there are more strict requirements to the position of the drilling fluid slurry liquid level in slurry cup,
But, the supporting plate in existing six fast rotation viscometers can run into following two situations in practical operation：
1st, it is solid by screw due to being sliding friction between the lifting slide bar of the supporting plate of blowing cup and six fast rotation viscometers
It is fixed.By after long-time use, the sliding of the contact interface between lifting slide bar and supporting plate is deteriorated, in lifting slurry cup less
Easy accurate position determination by sliding up and down repeatedly, it is necessary to can just make the liquid level in slurry cup be in desired position；
2nd, due to the rheological characteristic numerical value of drilling fluid be influenced by temperature it is larger, in order that the drilling fluid rheology that must be measured
Property numerical value have certain referential, in measurement process can use heater, temperature control is carried out to measured drilling fluid slurry,
To measure the rheological characteristic parameter in assigned temperature；But, under heating state, accurately slurry cup is adjusted by lifting supporting plate
Height, to ensure the uniformity of heating, operation difficulty is larger.
Utility model content
The purpose of this utility model is to provide a kind of rotation viscometer, so that solve can not be accurate present in prior art
Regulation supporting plate height technical problem.
The utility model provides a kind of rotation viscometer, including supporting plate, leading screw and tumbler, the tumbler with it is described
Leading screw worm drive so that the tumbler can around the axial direction rotation of leading screw while, and along the axial direction of the leading screw
Move in direction；The tumbler is installed on the supporting plate, and the tumbler along the leading screw axial direction move when, institute
Stating tumbler can drive the supporting plate to be moved along the axial direction of the leading screw；
Also include actuator, for driving the tumbler around the axial direction rotation of the leading screw.
Further, the tumbler is worm gear, and the actuator is worm screw；The screw thread of the worm screw and the worm gear
The gear teeth are meshed.
Further, the upper surface and lower surface of the worm gear have shaft extension portion respectively；Is arranged with the shaft extension portion
One bearing, wherein, the inner ring of the clutch shaft bearing is fixedly connected with the shaft extension portion, the outer ring of the clutch shaft bearing and the support
Plate is fixedly connected；
Second bearing is provided with the worm screw, wherein, the inner ring of the second bearing is fixedly connected with the worm screw, institute
The outer ring for stating second bearing is fixedly connected with the supporting plate.
Further, the tumbler is driven wheel of differential, and the actuator is drive bevel gear；The drive bevel gear
The gear teeth be meshed with the gear teeth of the driven wheel of differential.
Further, the upper surface and lower surface of the driven wheel of differential have shaft extension portion respectively, are covered in the shaft extension portion
Be provided with 3rd bearing, wherein, the inner ring of the 3rd bearing is fixedly connected with the shaft extension portion, the outer ring of the 3rd bearing with
The supporting plate is fixedly connected；
The drive bevel gear is installed on the supporting plate by active rotating shaft, wherein, the drive bevel gear is sheathed on
On the active rotating shaft, and the drive bevel gear is fixedly connected with the active rotating shaft；
Fourth bearing is also arranged with the active rotating shaft, wherein, the inner ring of the fourth bearing and the active rotating shaft
It is fixedly connected, the outer ring of the fourth bearing is fixedly connected with the supporting plate.
Further, crank or handwheel are provided with the worm screw.
Further, crank or handwheel are provided with the active rotating shaft.
Further, also including guide post；
Spacing hole is provided with the supporting plate, the guide post is arranged in the spacing hole, so that the supporting plate can
Moved along the length direction of the guide post.
Further, also including base, the bottom of the leading screw is fixed on the base.
The utility model additionally provides a kind of rotation viscometer, including supporting plate, leading screw and tumbler, the tumbler and institute
State leading screw worm drive so that the tumbler can around the axial direction rotation of leading screw while, and along the axle of the leading screw
Moved to direction；The tumbler is installed on the supporting plate, and the tumbler along the leading screw axial direction move when,
The tumbler can drive the supporting plate to be moved along the axial direction of the leading screw；
Also include actuator, for driving the tumbler around the axial direction rotation of the leading screw；
The upper surface of the supporting plate offers placement groove.
Compared with prior art, the beneficial effects of the utility model are：
The rotation viscometer that the utility model is provided, including supporting plate, leading screw and tumbler, tumbler are passed with leading screw spiral
It is dynamic so that tumbler can around the axial direction rotation of leading screw while, and axial direction along leading screw moves；Tumbler is installed
In on supporting plate, and tumbler, when being moved along the axial direction of leading screw, tumbler can drive supporting plate to be moved along the axial direction of leading screw
It is dynamic；Also include actuator, for driving tumbler around the axial direction rotation of leading screw.Tumbler is rotated by actuator, and
Moved along the axial direction of leading screw, and when tumbler moves up and down along the axial direction of leading screw, tumbler also drives supporting plate to transport up and down
It is dynamic；Due to being worm drive between tumbler and leading screw, therefore, it is possible to convenient regulation and the height of accurate control supporting plate；In addition,
Because the helical angle of leading screw is smaller, and less than angle of friction, thus when stop drive tumbler rotate when, tumbler just can than
Remains stationary on leading screw, will not decline, namely realize the self-locking of tumbler, and during the remains stationary of tumbler, supporting plate
Will not decline, therefore, the rotation viscometer that the utility model is provided is with the height that accurately can easily adjust supporting plate
Feature.
Brief description of the drawings
In order to illustrate more clearly of the utility model specific embodiment or technical scheme of the prior art, below will be right
The accompanying drawing to be used needed for specific embodiment or description of the prior art is briefly described, it should be apparent that, describe below
In accompanying drawing be some implementation methods of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the rotation viscometer that the utility model embodiment one is provided；
Fig. 2 is the structure principle chart of supporting plate up-down mode in the utility model embodiment one；
Fig. 3 is the structure principle chart of supporting plate up-down mode in the utility model embodiment two；
Fig. 4 is the structural representation of supporting plate in the utility model embodiment three.
In figure：100- supporting plates；101- leading screws；102- worm gears；103- worm screws；104- shaft extensions portion；105- clutch shaft bearings；106-
Second bearing；107- handwheels；108- guide posts；109- bases；110- rotating cylinder components；111- measurement assemblies；112- is from mantle tooth
Wheel；113- drive bevel gears；114- 3rd bearings；115- fourth bearings；116- places groove；117- active rotating shafts.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is a part of embodiment of the utility model, rather than whole embodiments.Based on the embodiment in the utility model, this
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
It is term " " center ", " on ", D score, "left", "right", " perpendicular, it is necessary to explanation in description of the present utility model
Directly ", the orientation or position relationship of the instruction such as " level ", " interior ", " outward " are, based on orientation shown in the drawings or position relationship, to be only
Described with simplified for the ease of description the utility model, must had rather than the device or element for indicating or implying meaning specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.Additionally, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying relative importance.
, it is necessary to explanation, unless otherwise clearly defined and limited, term " is pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integratedly
Connection；Can mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary,
Can be two connections of element internal.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
Embodiment one
Referring to shown in Fig. 1 and Fig. 2, the utility model embodiment one provides a kind of rotation viscometer, including supporting plate 100,
Leading screw 101 and tumbler, tumbler and the worm drive of leading screw 101, so that tumbler can be around the axial direction rotation of leading screw 101
While, and along the axial direction movement of leading screw 101；Tumbler is installed on supporting plate 100, and tumbler is along the axle of leading screw 101
When being moved to direction, tumbler can drive supporting plate 100 to be moved along the axial direction of leading screw 101；Also include actuator, for driving
Axial direction rotation of the dynamic tumbler around leading screw 101.
It should be noted that in the embodiment, only in rotation viscometer, the lifting structure of supporting plate 100 is changed
Enter, and be not described for not doing other components of improved rotation viscometer, and accompanying drawing is clearer to show the reality to make
Improvement project of the example for rotation viscometer is applied, rotating cylinder component 110 and the grade component of measurement assembly 111 is illustrate only.
Specifically, tumbler forms a screw pair with leading screw 101, and the lead angle of the screw thread of leading screw 101 is not more than spiral shell
Revolve secondary equivalent friction angle；The screw thread of leading screw 101 is rectangular thread；Tumbler can be on leading screw 101 along the axial direction of leading screw 101
Move up and down, and while moving up and down, tumbler itself can also occur rotation；Because tumbler is installed on supporting plate 100
On, while tumbler moves up and down along the axial direction of leading screw 101, axial direction of the supporting plate 100 also along leading screw 101 can be ordered about upper and lower
Motion, and tumbler can occur rotation relative to supporting plate 100, and while tumbler occurs rotation, supporting plate 100 is not
There is rotation in axial direction that can be also around leading screw 101, that is to say, while tumbler occurs rotation, supporting plate 100 is only done along leading screw 101
Axial direction up and down motion.
The rotation viscometer that the embodiment one is provided, tumbler is rotated by actuator, and along the axial direction side of leading screw 101
To movement, and when tumbler moves up and down along the axial direction of leading screw 101, tumbler also drives supporting plate 100 to move up and down；Due to turning
It is worm drive between moving part and leading screw 101, therefore, it is possible to convenient regulation and the height of accurate control supporting plate 100；Further, since
The helical angle of leading screw 101 is smaller, and less than angle of friction, therefore when stopping driving tumbler to rotate, tumbler just can than
Remains stationary on leading screw 101, will not decline, namely realize the self-locking of tumbler, and during the remains stationary of tumbler, supporting plate
100 will not also decline, therefore, the rotation viscometer that the embodiment is provided has accurately can easily adjust supporting plate 100
The characteristics of height.
In the embodiment, tumbler is worm gear 102, and actuator is worm screw 103；The screw thread of worm screw 103 and the wheel of worm gear 102
Tooth is meshed.
In the embodiment, the upper surface and lower surface of worm gear 102 have shaft extension portion 104 respectively；It is arranged with shaft extension portion 104
Clutch shaft bearing 105, wherein, the inner ring of clutch shaft bearing 105 is fixedly connected with shaft extension portion 104, the outer ring of clutch shaft bearing 105 and supporting plate
100 are fixedly connected；Second bearing 106 is provided with worm screw 103, wherein, the inner ring of second bearing 106 is fixed with worm screw 103 and connected
Connect, the outer ring of second bearing 106 is fixedly connected with supporting plate 100.
Specifically, clutch shaft bearing 105 and second bearing 106 are rolling bearing；Due to the effect of clutch shaft bearing 105,
During rotation, the axis that supporting plate 100 just can not be with worm gear 102 around leading screw 101 is rotated worm gear 102；Due to
The effect of two bearings 106, during rotation, supporting plate 100 just can not be with worm screw 103 around worm screw 103 for worm screw 103
Axis is rotated.When using, after making the rotation of worm screw 103, because the screw thread of worm screw 103 is meshed with the gear teeth of worm gear 102, because
This, worm screw 103 can rotate worm gear 102, because worm gear 102 is sheathed on leading screw 101, and with the helical rotation of leading screw 101, because
This, when worm gear 102 is rotated, worm gear 102 just can move up and down in the axial direction of leading screw 101, and the fortune up and down of worm gear 102
It is dynamic, the up and down motion of supporting plate 100 is just driven, so as to the height for realizing the slurry cup on supporting plate 100 is adjusted.It should be noted that should
In embodiment, the shaft extension portion 104 of worm gear 102 can be replaced by being sheathed on a hollow pipe in worm gear 102, the hollow pipe
Outer surface is fixedly connected with worm gear 102, inner surface and the worm drive of leading screw 101 of hollow pipe, and clutch shaft bearing 105 is sheathed on sky
The outer surface of heart pipe.
In the embodiment, crank or handwheel are provided with worm screw 103.Specifically, handwheel, hand are provided with worm screw 103
Wheel 107 is star hand wheel；By crank or handwheel realizing the manual regulation of the height of supporting plate 100.It should be noted that the implementation
In example, worm screw 103 can also be connected with the output shaft of a stepper motor, snail is made by controlling the rotation of stepper motor
Bar 103 is rotated, to realize the regulation of the height of supporting plate 100；Handwheel 107 is star hand wheel.
In the embodiment, rotation viscometer also includes guide post 108；Spacing hole, guide post 108 are provided with supporting plate 100
It is arranged in spacing hole, so that supporting plate 100 can be moved along the length direction of guide post 108；The length direction of guide post 108 with
The length direction of leading screw 101 is parallel.Supporting plate 100 can be prevented when moving up and down, with rotation by the guide post 108 for setting
Part is rotated together.Rotating cylinder component and measurement assembly are supported by leading screw and guide post.
In the embodiment, rotation viscometer also includes base 109, and the bottom of leading screw 101 is fixed on base 109.It is oriented to
Bar 108 is fixed on base 109；The lower section of base 109 is additionally provided with foot pad.
It should be noted that for the ease of the specific amount of identification to height, in the embodiment, Ke Yi, guide post
Graduation mark is set on 108, or a vertical height gauge is set on base 109, length direction and the guide post 108 of height gauge
Length direction is parallel.
In sum, when being tested, the embodiment provide rotation viscometer, can operate it is more accurate control and
Regulation height, industrially with stronger value；Further, since the worm drive of tumbler and leading screw 101, and energy
Self-locking is reached, therefore avoids supporting plate 100 in the prior art and plunked down from lifting slide bar, cause the liquid in slurry cup to spill,
The situation damaged measuring instrument and injure operating personnel occurs.
Embodiment two
The utility model embodiment two provides a kind of rotation viscometer, and the rotation viscometer of the embodiment describes described
Another implementation of tumbler and actuator, the technical scheme of embodiment one in addition falls within the embodiment, no
Repeat description.
Shown in Figure 3, in the embodiment, tumbler is driven wheel of differential 112, and actuator is drive bevel gear 113；It is main
The gear teeth of dynamic bevel gear 113 are meshed with the gear teeth of driven wheel of differential 112.
In the embodiment, the upper surface and lower surface of driven wheel of differential 112 have shaft extension portion 104 respectively, in shaft extension portion 104
3rd bearing 114 is arranged with, wherein, the inner ring of 3rd bearing 114 is fixedly connected with shaft extension portion 104, the outer ring of 3rd bearing 114
It is fixedly connected with supporting plate 100；Drive bevel gear 113 is installed on supporting plate 100 by active rotating shaft, wherein, drive bevel gear 113
It is sheathed on active rotating shaft, and drive bevel gear 113 is fixedly connected with active rotating shaft；Fourth bearing is also arranged with active rotating shaft
115, wherein, the inner ring of fourth bearing 115 is fixedly connected with active rotating shaft, and the outer ring of fourth bearing 115 is fixed with supporting plate 100 and connected
Connect.
Specifically, 3rd bearing 114 and fourth bearing 115 are rolling bearing；Due to the effect of 3rd bearing 114,
Driven wheel of differential 112 during rotation, supporting plate 100 just can not with driven wheel of differential 112 around leading screw 101 axis
Rotate；Due to the effect of fourth bearing 115, during rotation, supporting plate 100 just can not be with actively for drive bevel gear 113
Bevel gear 113 rotates around the axis of drive bevel gear 113 together.When using, after making the rotation of drive bevel gear 113, due to
The gear teeth of drive bevel gear 113 are meshed with the gear teeth of driven wheel of differential 112, therefore, drive bevel gear 113 can make from mantle
Gear 112 is rotated, because driven wheel of differential 112 is sheathed on leading screw 101, and with the helical rotation of leading screw 101, therefore, from mantle
When gear 112 is rotated, driven wheel of differential 112 just can move up and down in the axial direction of leading screw 101, and driven wheel of differential 112
Up and down motion, just drive supporting plate 100 up and down motion, so as to realize the slurry cup on supporting plate 100 height adjust.Need explanation
, in the embodiment, the shaft extension portion 104 of driven wheel of differential 112 can be sheathed on a hollow pipe by driven wheel of differential 112
On replace, the outer surface of the hollow pipe is fixedly connected with driven wheel of differential 112, inner surface and leading screw 101 spiral of hollow pipe
Transmission, and 3rd bearing 114 is sheathed on the outer surface of hollow pipe.
In the embodiment, crank or handwheel are provided with active rotating shaft 117.Specifically, handwheel is to be set on active rotating shaft
It is equipped with handwheel；Star hand wheel；By crank or handwheel realizing the manual regulation of the height of supporting plate 100.It should be noted that the reality
Apply in example, active rotating shaft can also be connected with the output shaft of a stepper motor, made by controlling the rotation of stepper motor
Active rotating shaft is rotated, to realize the regulation of the height of supporting plate 100；Handwheel is star hand wheel.
Embodiment three
Rotation viscometer in the present embodiment is the improvement on the basis of embodiment one or embodiment two, embodiment one or
Technology contents not repeated description disclosed in embodiment two, embodiment one or the disclosure of embodiment two fall within the present embodiment
Disclosure.
Shown in Figure 4, in the embodiment, the upper surface of supporting plate 100 offers placement groove 116.When using, by slurry cup
It is positioned in placement groove 116；For the ease of the fixation to slurry cup, clip can also be installed on supporting plate 100, when using, lead to
Cross clip and slurry cup is fixed on supporting plate 100.It should be noted that in the embodiment, edge can also be installed on supporting plate
Shelves are enclosed in setting, and what such slurry cup just can be consolidated is placed on supporting plate.
Finally it should be noted that：Various embodiments above is only used to illustrate the technical solution of the utility model, rather than it is limited
System；Although being described in detail to the utility model with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.Although additionally, it will be appreciated by those of skill in the art that some implementations described herein
Example is including some features included in other embodiments rather than further feature, but the combination meaning of the feature of different embodiments
Taste within the scope of the utility model and forms different embodiments.For example, in the following claims, institute
The one of any of claimed embodiment mode can use in any combination.
Claims (10)
1. a kind of rotation viscometer, it is characterised in that including supporting plate, leading screw and tumbler, the tumbler and the leading screw spiral shell
Rotation transmission so that the tumbler can around the axial direction rotation of leading screw while, and along the leading screw axial direction move
It is dynamic；The tumbler is installed on the supporting plate, and the tumbler along the leading screw axial direction move when, the rotation
Part can drive the supporting plate to be moved along the axial direction of the leading screw；
Also include actuator, for driving the tumbler around the axial direction rotation of the leading screw.
2. rotation viscometer according to claim 1, it is characterised in that the tumbler is worm gear, the actuator is
Worm screw；The screw thread of the worm screw is meshed with the gear teeth of the worm gear.
3. rotation viscometer according to claim 2, it is characterised in that the upper surface and lower surface of the worm gear have respectively
There is shaft extension portion；Clutch shaft bearing is arranged with the shaft extension portion, wherein, the inner ring of the clutch shaft bearing is fixed with the shaft extension portion and connected
Connect, the outer ring of the clutch shaft bearing is fixedly connected with the supporting plate；
Second bearing is provided with the worm screw, wherein, the inner ring of the second bearing is fixedly connected with the worm screw, and described
The outer ring of two bearings is fixedly connected with the supporting plate.
4. rotation viscometer according to claim 1, it is characterised in that the tumbler is driven wheel of differential, the drive
Moving part is drive bevel gear；The gear teeth of the drive bevel gear are meshed with the gear teeth of the driven wheel of differential.
5. rotation viscometer according to claim 4, it is characterised in that the upper surface and lower surface of the driven wheel of differential
There is shaft extension portion respectively, 3rd bearing is arranged with the shaft extension portion, wherein, the inner ring of the 3rd bearing and the shaft extension portion
It is fixedly connected, the outer ring of the 3rd bearing is fixedly connected with the supporting plate；
The drive bevel gear is installed on the supporting plate by active rotating shaft, wherein, the drive bevel gear is sheathed on described
On active rotating shaft, and the drive bevel gear is fixedly connected with the active rotating shaft；
Fourth bearing is also arranged with the active rotating shaft, wherein, the inner ring of the fourth bearing is fixed with the active rotating shaft
Connection, the outer ring of the fourth bearing is fixedly connected with the supporting plate.
6. rotation viscometer according to claim 3, it is characterised in that crank or handwheel are provided with the worm screw.
7. rotation viscometer according to claim 5, it is characterised in that crank or hand are provided with the active rotating shaft
Wheel.
8. the rotation viscometer according to any one of claim 1-5, it is characterised in that also including guide post；
Spacing hole is provided with the supporting plate, the guide post is arranged in the spacing hole, so that the supporting plate can be along institute
State the length direction movement of guide post.
9. the rotation viscometer according to any one of claim 1-5, it is characterised in that also including base, the leading screw
Bottom be fixed on the base.
10. a kind of rotation viscometer, it is characterised in that including supporting plate, leading screw and tumbler, the tumbler and the leading screw spiral shell
Rotation transmission so that the tumbler can around the axial direction rotation of leading screw while, and along the leading screw axial direction move
It is dynamic；The tumbler is installed on the supporting plate, and the tumbler along the leading screw axial direction move when, the rotation
Part can drive the supporting plate to be moved along the axial direction of the leading screw；
Also include actuator, for driving the tumbler around the axial direction rotation of the leading screw；
The upper surface of the supporting plate offers placement groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621397906.2U CN206258342U (en) | 2016-12-19 | 2016-12-19 | Rotation viscometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621397906.2U CN206258342U (en) | 2016-12-19 | 2016-12-19 | Rotation viscometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206258342U true CN206258342U (en) | 2017-06-16 |
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ID=59030199
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621397906.2U Active CN206258342U (en) | 2016-12-19 | 2016-12-19 | Rotation viscometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398357A (en) * | 2018-04-13 | 2018-08-14 | 浙江国森精细化工科技有限公司 | A kind of viscosimeter examined for pressure-sensitive colloidality |
-
2016
- 2016-12-19 CN CN201621397906.2U patent/CN206258342U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398357A (en) * | 2018-04-13 | 2018-08-14 | 浙江国森精细化工科技有限公司 | A kind of viscosimeter examined for pressure-sensitive colloidality |
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