CN103076259B - Device and method for measuring bulk density-pressure relation of powder material - Google Patents
Device and method for measuring bulk density-pressure relation of powder material Download PDFInfo
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- CN103076259B CN103076259B CN201310000565.5A CN201310000565A CN103076259B CN 103076259 B CN103076259 B CN 103076259B CN 201310000565 A CN201310000565 A CN 201310000565A CN 103076259 B CN103076259 B CN 103076259B
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- pressure
- bulk density
- compressing rod
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- barrel
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- 239000000843 powder Substances 0.000 title claims abstract description 57
- 239000000463 material Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 238000003860 storage Methods 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The invention relates to a device and a method for measuring the bulk density-pressure relation of a powder material. The device comprises a charging barrel, a storing cavity, a threaded sleeve, a pressing bar, a lock nut, mounting holes of a first pressure sensor and a second pressure sensor, as well as a fastening device, wherein the pressing bar is used for changing the volume of the storing cavity and further changing the bulk density of the powder material, extruding the material, and changing the material pressure. The measuring method includes steps that the powder material is placed into the storing cavity to an original position length; the threaded sleeve pushes the pressing bar to move axially towards the inside of the charging barrel to a working position length of the storing cavity; the bulk density of the powder material caused by volume compression of the storing cavity is calculated according to the original position length of the storing cavity, the bulk density of the powder material under a normal pressure, and the working position length; and the corresponding relation of the bulk density and the pressure of the compressed powder material is obtained. According to the device and the method, high pressure can be obtained without utilization of a hydraulic system, and easiness and accuracy are achieved.
Description
Technical field
The present invention relates to powder body material bulk density-pressure test device and method, particularly relevant to powder body material bulk density equipment de-sign field.
Background technology
Powder bulk density refers to the average density of the discrete particles accumulation body comprising exit orifice and intergranular space in particle.The bulk density characteristic of powder body material changes along with the change of pressure.Powder body material bulk density and pressure in specific confined space of certain mass are one to one.At powder manufacture field, the affected by high caused due to the compression of powder volume design or the selection of power-equipment.Such as in the closed C shape room of counter rotation twin screw extruder, the pressure size of powder body material directly affects the important parameter such as power and moment of torsion of equipment.Therefore the research of powder bulk density-pressure dependence is very necessary.
The method of current mensuration powder bulk density is: the ratio of the powder granule material quality of freely filling and unit volume under prescribed conditions.But current instrument is mainly for the measurement of the powder bulk density under the angle of repose of powder body material, mobility and atmospheric pressure state.For the measurement of powder body material bulk density size under different pressures state, also there is no corresponding method of testing at present.
Summary of the invention
The object of the invention is to, by providing a kind of device measuring powder body material bulk density-pressure characteristic, to realize the research of powder body material bulk density characteristic at various pressures.
Measure a device for powder body material bulk density-pressure, it is characterized in that: application such as lower device carries out the measurement of bulk density-pressure, and the formation of its device is as Fig. 1:
A kind of measurement mechanism of bulk density-pressure relation of powder material, it is characterized in that: compressing rod 4 to be arranged in screw shell 3 and both axially parallel installations, that one end relative with compressing rod top is called bottom, compressing rod 4 bottom is concordant with screw shell 3 bottom surface, and compressing rod 4 bottom is provided with the second pressure transducer mounting hole 7; Compressing rod 4 and screw shell 3 are in the nut lock of compressing rod top, and threaded sleeve portion inwall and part barrel outer wall are threaded connection, and barrel fixes to clamp by stationary installation; The first pressure transducer mounting hole 6 is provided with in the position that barrel is relative with compressing rod bottom;
The first pressure transducer mounting hole on barrel and compressing rod and the second pressure transducer mounting hole setting pressure sensor respectively; Storage cavity is formed by the space surrounded between material tube inner wall and compressing rod bottom.
Leave certain interval between compressing rod and material tube inner wall, this gap ensures that in transmission process, compressing rod and material tube inner wall do not interfere.Gap length scope is 0.05-0.5mm, determines according to powder body material difference.
The course of work of this device: compressing rod and screw shell are assembled and locks with hexagonal nut, setting pressure sensor.Powder body material to be added in storage cavity 2 to original position length L0, loads onto screw shell and rotate a fixing turn and seal powder, device is fixed on fastener 8.Along with the rotation of screw shell 3, compressing rod 4 compressed material, the pressure of powder imports experimental data acquisition system into by the sensor be arranged on the first pressure transducer mounting hole 6 and the second pressure transducer mounting hole 7.Converse the density of powder according to the advance distance of compressing rod and the working position length L of storage cavity, meanwhile read pressure size.
For waste old rubber powder, rubber powder bulk density-pressure relationship plot can be obtained according to above measuring method.Extrude desulfurization at incongruous double screw to reclaim in the process of waste old rubber powder, rubber powder is isolated in C shape room independent of each other.The change of each C shape room volume will affect the change of powder body material bulk density, and then affects the pressure change of each C shape indoor.According to bulk density-pressure relation of powder material curve, the pressure distribution of axial each C shape indoor of twin-screw can be calculated, and then the power consumption that can calculate on whole screw rod and moment of torsion.
By screw shell rotary actuation compressing rod compression powder, draw powder bulk density-pressure dependence according to the registration of pressure transducer and the working position length of storage cavity.
Described patent content can be used for the research of various powder body material or subparticle bulk density-pressure characteristic.
Accompanying drawing explanation
The schematic diagram of Fig. 1 powder body material bulk density-device for pressure measurement.
Wherein, 1 barrel, 2 storage cavitys, 3 screw shells, 4 compressing rods, 5 set nuts, 6 first pressure transducer mounting holes, 7 second pressure transducer mounting holes, 8 fasteners.
The initial position figure of Fig. 2 measurement mechanism storage cavity, L0 are the original position length of storage cavity
The working position figure of Fig. 3 measurement mechanism storage cavity, L are the working position length of storage cavity
Fig. 4 powder body material bulk density-pressure curve
Embodiment
The parts of this device consist of:
Compressing rod 4 and screw shell 3 assemble and use set nut 5 to fix, and the first pressure transducer mounting hole 6 respectively on barrel 1 and compressing rod 4 and the second pressure transducer mounting hole 7 install pressure transducer; Powder body material is loaded the original position length L0 to storage cavity in barrel 1, be threaded by screw shell 3 with barrel 1, and rotate the specific number of turns end face of compressing rod 4 is contacted with powder just, now, the density of powder is normal pressure P
0under bulk density ρ
0.Continue to rotate screw shell to a certain position, screw shell tip-to-face distance barrel bottom surface distance is the working position length L of storage cavity, and two-way pressure sensor registration is P
1, P
2, then the density of powder and pressure are respectively this moment:
These computing method can be applicable to the measurement of all kinds bulk density-pressure relation of powder material.
For 20 order waste rubber powders, the corresponding relation of bulk density and pressure is as shown in table 1 at normal temperatures.
The bulk density of table 1 waste rubber powder and the relation of pressure
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Pressure/MPa | 0.1 | 0.2 | 0.77 | 0.904 | 1.098 | 1.737 | 5.138 | 14.041 |
| Density/g/cm 3 | 0.392 | 0.915 | 1.097 | 1.12 | 1.143 | 1.168 | 1.183 | 1.193 |
The pressure-dependent relation of its bulk density is as Fig. 4.
In above embodiment and described in Fig. 1, be only an example of the present invention is described, and and unrestricted technical scheme described in the invention; Such as: this measurement mechanism can be changed into vertical placement.Although with reference to each above-mentioned embodiment to present invention has been detailed description, those of ordinary skill in the art should be appreciated that and still can modify to the present invention or equivalent replacement; And all do not depart from technical scheme and the improvement thereof of the protection domain that the present invention proposes, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. the measurement mechanism of a bulk density-pressure relation of powder material, it is characterized in that: compressing rod to be arranged in screw shell and both axially parallel installations, that one end relative with compressing rod top is called bottom, compressing rod bottom is concordant with screw shell bottom surface, and compressing rod bottom is provided with the second pressure transducer mounting hole; Compressing rod and screw shell are in the nut lock of compressing rod top, and threaded sleeve portion inwall and part barrel outer wall are threaded connection, and barrel fixes to clamp by stationary installation; The first pressure transducer mounting hole is provided with in the position that barrel is relative with compressing rod bottom;
The first pressure transducer mounting hole on barrel and compressing rod and the second pressure transducer mounting hole setting pressure sensor respectively; Storage cavity is formed by the space surrounded between material tube inner wall and compressing rod bottom.
2. apply device as claimed in claim 1 and carry out the measuring method of bulk density-pressure relation of powder material, it is characterized in that: powder body material is put into storage cavity original position length, rotate screw shell to promote compressing rod in barrel, move axially working position length to storage cavity, go out powder body material because of the bulk density after the compression of storage cavity volume according to the powder body material bulk density under the original position length of storage cavity, normal pressure and working position length computation; By the reading of the pressure transducer on barrel and compressing rod, obtain powder body material bulk density-pressure corresponding relation.
3. method according to claim 2, it is characterized in that: change the working position length in storage cavity, calculating corresponding powder body material bulk value, can there is corresponding change in detected force value, draws the relation curve by the powder body material bulk density compressed and pressure thus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310000565.5A CN103076259B (en) | 2013-01-02 | 2013-01-02 | Device and method for measuring bulk density-pressure relation of powder material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310000565.5A CN103076259B (en) | 2013-01-02 | 2013-01-02 | Device and method for measuring bulk density-pressure relation of powder material |
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| Publication Number | Publication Date |
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| CN103076259A CN103076259A (en) | 2013-05-01 |
| CN103076259B true CN103076259B (en) | 2014-12-31 |
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| CN201310000565.5A Expired - Fee Related CN103076259B (en) | 2013-01-02 | 2013-01-02 | Device and method for measuring bulk density-pressure relation of powder material |
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| CN112903523B (en) * | 2021-01-27 | 2022-10-18 | 武汉裕大华纺织有限公司 | Method for adjusting compaction density of dust compactor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101140214A (en) * | 2006-09-04 | 2008-03-12 | 深圳市比克电池有限公司 | Method for testing battery positive pole powder material compacted density |
| CN102818745A (en) * | 2012-08-03 | 2012-12-12 | 中建商品混凝土天津有限公司 | Device and method for testing powder bulk density |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007263860A (en) * | 2006-03-29 | 2007-10-11 | Dowa Holdings Co Ltd | Tap density measuring method and device of powder |
| US8464592B2 (en) * | 2009-10-02 | 2013-06-18 | Hitec Luxembourg S.A. | Method and apparatus for determining void volume for a particulate material |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101140214A (en) * | 2006-09-04 | 2008-03-12 | 深圳市比克电池有限公司 | Method for testing battery positive pole powder material compacted density |
| CN102818745A (en) * | 2012-08-03 | 2012-12-12 | 中建商品混凝土天津有限公司 | Device and method for testing powder bulk density |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2007-263860A 2007.10.11 * |
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