CN105928588A - Multi-stage combined type anti-blocking material level measuring device - Google Patents
Multi-stage combined type anti-blocking material level measuring device Download PDFInfo
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- CN105928588A CN105928588A CN201610281599.XA CN201610281599A CN105928588A CN 105928588 A CN105928588 A CN 105928588A CN 201610281599 A CN201610281599 A CN 201610281599A CN 105928588 A CN105928588 A CN 105928588A
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- flange
- compressed air
- limestone powder
- powder bin
- tuning
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
Abstract
The invention discloses a multi-stage combined type anti-blocking material level measuring device. The device comprises a radar material level gauge, two relatively parallel tuning fork material level measuring devices and four compressed air blocking prevention devices, wherein the radar material level gauge is perpendicularly inserted into the middle of a limestone powder bin from the top of the limestone powder bin, two tuning fork type material level switches are inserted into the right side wall of the limestone powder bin, a first compressed air blocking prevention device, a second compressed air blocking prevention device and a third compressed air blocking prevention device are inserted into the left side wall of the limestone powder bin, and a fourth compressed air blocking prevention device is inserted into the right side wall of the limestone powder bin. The multi-stage combined type anti-blocking material level measuring device has the benefits as follows: the material level can be monitored ceaselessly, and once any one measuring instrument breaks down, other measuring instruments can continuously monitor the material level; by means of the four compressed air blocking prevention devices, false information and misinformation after materials are accumulated on the material level gauge can be effectively avoided, and data reported by the material level gauge are more accurate.
Description
Technical field
The present invention relates to technical field of desulfurization, in particular to a kind of anti-blocking multistage combined material position
Measurement apparatus.
Background technology
In sulfur removal technology, wet desulfurization of flue gas by limestone-gypsum method is prevailing technology.Wet at limestone-gypsum
In method flue gas desulfurization technique, the lime stone slurry in limestone slurry liquid preparing system is added by slurry supply pump to be inhaled
Receive tower, by the gypsum slurries discharged in absorption tower by transport pump to dewatering system, carry out dehydration and generate stone
Cream.The material position parameter of limestone plays vital effect to operation, the control of whole desulphurization system,
Therefore the material position of limestone powder bin must be measured.But existing measurement apparatus is easily by material properties
Impact, unstable properties, measure inaccuracy.
Summary of the invention
For solving the problems referred to above, it is an object of the invention to provide a kind of anti-blocking multistage combined material position and survey
Amount device, can be prevented effectively from level-sensing device and occur after buildup lying about, reporting by mistake, make the number that level-sensing device is reported and submitted
According to more accurate.
The invention provides a kind of anti-blocking multistage combined apparatus for measuring charge level, including:
Radar level gauge, it includes gauge outfit, extension tube and radar probe, described gauge outfit and described extension tube
One end connect, described gauge outfit and described extension tube be respectively positioned on the center position above limestone powder bin,
One end of described gauge outfit is fixed with flange, and the top of described limestone powder bin is fixed with the first welded flange,
Described gauge outfit is fixed on described limestone powder bin top by described first flange and described first welded flange
Outer wall on, the other end of described radar probe and described extension tube connects, and described radar probe is vertically inserted
Enter in described limestone powder bin and be positioned at described limestone powder bin to expect on position；
First tuning fork apparatus for measuring charge level, it includes the first feeding pipeline and the first tuning-fork type level switch,
The entrance of described first feeding pipeline is obliquely installed relative to the right sidewall of described limestone powder bin, and with
The most angled A of described limestone powder bin, the outlet of described first feeding pipeline is fixed with second
Welded flange, described first tuning-fork type level switch is arranged on described first feeding pipeline and with described
One feeding pipeline is fixing to be connected, and the tuning fork of described first tuning-fork type level switch stretches into described first feeding pipe
Road, the axis of described first tuning-fork type level switch and the dead in line of described first feeding pipeline, described
The second flange, described second flange and described second welded flange it is fixed with on first tuning-fork type level switch
Fixing connection, the distance between described second flange and the right sidewall of described limestone powder bin is L1；
Second tuning fork apparatus for measuring charge level, it includes the second feeding pipeline and the second tuning-fork type level switch,
The entrance of described second feeding pipeline is obliquely installed relative to the right sidewall of described limestone powder bin, and with
The most angled B of described limestone powder bin, the outlet of described second feeding pipeline is fixed with the 3rd
Welded flange, described second tuning-fork type level switch is arranged on described second feeding pipeline and with described
Two feeding pipelines are fixing to be connected, and the tuning fork of described second tuning-fork type level switch stretches into described second feeding pipe
Road, the axis of described second tuning-fork type level switch and the dead in line of described second feeding pipeline, described
Three-flange, described three-flange and described 3rd welded flange it is fixed with on second tuning-fork type level switch
Fixing connection, the distance between described three-flange and the right sidewall of described limestone powder bin is L2；
First compressed air anti-block apparatus, its one end connects compressed air, and described first compressed air is anti-blocking
The other end of device inserts described limestone powder bin from the left side sidewall horizontal of described limestone powder bin, institute
The other end stating the first compressed air anti-block apparatus is relative with the lower end of described radar probe；
Second compressed air anti-block apparatus, its one end connects compressed air, and described second compressed air is anti-blocking
The other end of device inserts described limestone powder bin from the left side sidewall horizontal of described limestone powder bin, institute
The other end stating the second compressed air anti-block apparatus is relative with the tuning fork of described first tuning-fork type level switch；
3rd compressed air anti-block apparatus, its one end connects compressed air, and described 3rd compressed air is anti-blocking
The other end of device inserts described limestone powder bin from the left side sidewall horizontal of described limestone powder bin, institute
The other end stating the 3rd compressed air anti-block apparatus is relative with the tuning fork of described second tuning-fork type level switch；
4th compressed air anti-block apparatus, its one end connects compressed air, and described 4th compressed air is anti-blocking
The other end of device inserts described limestone powder bin from the right sidewall of described limestone powder bin, and described the
The other end of four compressed air anti-block apparatus is relative with the upper end of described radar probe；
Wherein, described angle A and described angle B are equal, and described distance L1 and described distance L2 are equal.
Further improving as the present invention, described angle A and described angle B are 15 °.
Further improving as the present invention, described distance L1 and described distance L2 are 100mm.
Further improving as the present invention, described first compressed air anti-block apparatus is provided with first once
Door, described second compressed air anti-block apparatus is provided with the second once door, and described 3rd compressed air is anti-blocking
Device is provided with the 3rd once door, and described 4th compressed air anti-block apparatus is provided with ball valve.
Further improve as the present invention, described first once door, described second once door, described
Three once door and described ball valve are respectively positioned on outside described limestone powder bin.
Further improving as the present invention, described first flange and described first welded flange pass through bolt
Fixing and connect, described second flange and described second welded flange are bolted to connection, and the described 3rd
Flange and described 3rd welded flange are bolted to connection.
Further improve as the present invention, be provided with between described first flange and described first welded flange
Flange gasket, is provided with flange gasket between described second flange and described second welded flange, described
It is provided with flange gasket between three-flange and described 3rd welded flange.
Further improve as the present invention, also include that heat-insulation layer, described heat-insulation layer are positioned at described limestone
On the outer wall of powder cabin.
The invention have the benefit that
1, this measurement apparatus length in service life, stable performance, safe and reliable；
2, being obliquely installed of feeding pipeline, effectively reduces agstone wall built-up so that measured value is more accurate；
3, unreliable, the weakness that detection real-time is the strongest well solving that existing anthropic factor causes,
Preferably ensure the stable operation of desulphurization system；
4, by radar level gauge and the combining form of two tuning-fork type level switchs, it is ensured that to material position
Monitoring is uninterrupted, breaks down once wherein any one measuring instrument, and other measuring instrument all may be used
To continue material position is monitored.Meanwhile, after by the early warning of tuning-fork type level switch, moreover it is possible to pass through thunder
Reach level-sensing device in real time material position to be monitored, obtain expecting the occurrence of position；
5, the arranging can be prevented effectively from level-sensing device and occur after buildup lying about, by mistake of compressed air anti-block apparatus
Report, the data making level-sensing device report and submit are more accurate.
Accompanying drawing explanation
Fig. 1 is the structure of a kind of anti-blocking multistage combined apparatus for measuring charge level described in the embodiment of the present invention
Schematic diagram.
In figure,
1, limestone powder bin；2, gauge outfit；3, flange gasket；4, bolt；51, the first welding
Blue；52, the second welded flange；53, the 3rd welded flange；6, heat-insulation layer；7, extension tube；8, thunder
Reach probe；91, the first tuning-fork type level switch；92, the second tuning-fork type level switch；101, the first method
Blue；102, the second flange；103, three-flange；111, the first compressed air anti-block apparatus；112,
Two compressed air anti-block apparatus；113, the 3rd compressed air anti-block apparatus；114, the 4th compressed air is prevented
Block apparatus；121, the first once door；122, the second once door；123, the 3rd once door；13, ball valve.
Detailed description of the invention
Below by specific embodiment and combine accompanying drawing the present invention is described in further detail.
As it is shown in figure 1, a kind of anti-blocking multistage combined apparatus for measuring charge level of the embodiment of the present invention, bag
Include radar level gauge, the tuning fork apparatus for measuring charge level of two opposing parallel settings and four compressed airs anti-blocking
Device.
Radar level gauge includes gauge outfit 2, extension tube 7 and radar probe 8, gauge outfit 2 and the one of extension tube 7
End connects, and gauge outfit 2 and extension tube 7 are respectively positioned on the center position above limestone powder bin 1, gauge outfit 2
One end be fixed with flange 101, the top of limestone powder bin 1 is fixed with the first welded flange 51, gauge outfit 2
It is fixed on the outer wall at limestone powder bin 1 top by the first flange 101 and the first welded flange 51, the
One flange 101 and the first welded flange 51 connect by bolt 4 is fixing, the first flange 101 and the first weldering
Being provided with flange gasket 3 between acting flange 51, the other end of radar probe 8 and extension tube 7 connects, thunder
Reach in probe 8 is inserted perpendicularly into limestone powder bin 1 and be positioned on limestone powder bin 1 material position.
First tuning fork apparatus for measuring charge level includes the first feeding pipeline and the first tuning-fork type level switch 91, the
The entrance of one feeding pipeline is obliquely installed relative to the right sidewall of limestone powder bin 1, and and agstone
Storehouse 1 is in the horizontal direction in 15 °, and the outlet of the first feeding pipeline is fixed with the second welded flange 52, and first
Tuning-fork type level switch 91 is arranged on the first feeding pipeline and fixes with the first feeding pipeline and is connected, and first
The tuning fork of tuning-fork type level switch 91 stretches into the first feeding pipeline, the axle of the first tuning-fork type level switch 91
Line and the dead in line of the first feeding pipeline, the first tuning-fork type level switch 91 is fixed with the second flange
102, the second flange 102 and the second welded flange 52 connect by bolt 4 is fixing, the second flange 102
With second be provided with flange gasket 3, the second flange 102 and limestone powder bin 1 between welded flange 52
Distance between right sidewall is 100mm.
Second tuning fork apparatus for measuring charge level includes the second feeding pipeline and the second tuning-fork type level switch 92, the
The entrance of two feeding pipelines is obliquely installed relative to the right sidewall of limestone powder bin 1, and and agstone
Storehouse 1 is in the horizontal direction in 15 °, and the outlet of the second feeding pipeline is fixed with the 3rd welded flange 53, and second
Tuning-fork type level switch 92 is arranged on the second feeding pipeline and fixes with the second feeding pipeline and is connected, and second
The tuning fork of tuning-fork type level switch 92 stretches into the second feeding pipeline, the axle of the second tuning-fork type level switch 92
Line and the dead in line of the second feeding pipeline, the second tuning-fork type level switch 92 is fixed with three-flange
103, three-flange 103 and the 3rd welded flange 53 connect by bolt 4 is fixing, three-flange 103
With the 3rd be provided with flange gasket 3 between welded flange 53, three-flange 103 and limestone powder bin 1
Distance between right sidewall is 100mm.
One end of first compressed air anti-block apparatus 111 connects compressed air, the first anti-blocking dress of compressed air
The other end putting 111 inserts limestone powder bin 1 from the left side sidewall horizontal of limestone powder bin 1, and first
Compressed air anti-block apparatus 111 is provided with the first once door 121, the first compressed air anti-block apparatus 111
The other end is relative with the lower end of radar probe 8.
One end of second compressed air anti-block apparatus 112 connects compressed air, the second anti-blocking dress of compressed air
The other end putting 112 inserts limestone powder bin 1 from the left side sidewall horizontal of limestone powder bin 1, and second
Compressed air anti-block apparatus 112 is provided with the second once door 122, the second compressed air anti-block apparatus 112
The tuning fork of the other end and the first tuning-fork type level switch 91 is relative.
One end of 3rd compressed air anti-block apparatus 113 connects compressed air, the 3rd anti-blocking dress of compressed air
The other end putting 113 inserts limestone powder bin 1 from the left side sidewall horizontal of limestone powder bin 1, and the 3rd
Compressed air anti-block apparatus 113 is provided with the 3rd once door 123, the 3rd compressed air anti-block apparatus 113
The tuning fork of the other end and the second tuning-fork type level switch 92 is relative.
One end of 4th compressed air anti-block apparatus 114 connects compressed air, the 4th anti-blocking dress of compressed air
The other end putting 114 inserts limestone powder bin 1 from the right sidewall of limestone powder bin 1, the 4th compression
Air anti-block apparatus 114 is provided with ball valve 13, the other end of the 4th compressed air anti-block apparatus 114 and thunder
The upper end reaching probe 8 is relative.
Wherein, first once door 121, second once door the 122, the 3rd once door 123 and ball valve 13 equal
It is positioned at limestone powder bin 1 outside.
Further, also include that heat-insulation layer 6, heat-insulation layer 6 are positioned on the outer wall of limestone powder bin 1.
Radar level gauge is used for monitoring the material position of limestone powder bin 1 in real time, the ultimate principle of work
It is to launch-reflection-reception.The antenna of radar level gauge launches electromagnetic wave with the form of wave beam, these electricity
Magnetic wave is received by the antenna after being reflected by agstone again.
The relational expression that radar level gauge measures limestone powder position is as follows:
H=H vt/2
In formula, h is material position；H is the height of limestone powder bin 1；V is radar wave speed；T is radar
Electromagnetic radiation is to the interval time received.
When the tuning fork of tuning-fork type level switch contacts with agstone, the frequency of tuning fork and amplitude will change
Becoming, these changes of tuning-fork type level switch are carried out detecting by built-in smart circuit, process, are changed
It is a switching signal, is ultimately converted to the material position information of agstone.Second tuning-fork type level switch 92
It is used for low material position (i.e. material position is less than or equal to the 1/3 of limestone powder bin height) is carried out early warning, once detects
When being less than or equal to the 1/3 of limestone powder bin height to material position, the second tuning-fork type level switch 92 is reported to the police.The
One tuning-fork type level switch 91 is used for high charge level (i.e. material position is more than or equal to the 2/3 of limestone powder bin height)
Carry out early warning, once detect that material position is more than or equal to the 2/3 of limestone powder bin height, the first tuning-fork type material position
Switch 91 warning.
The air of compression is introduced by the first compressed air anti-block apparatus 111 by the switch of the first once door 121
Limestone powder bin 1, has dispelled the buildup being accumulated on radar level gauge, and meanwhile, the 4th compressed air is anti-blocking
The air of compression is introduced limestone powder bin 1 by the switch of ball valve 13 by device 114, has dispelled long-pending further
Tire out the buildup on radar level gauge so that the measurement data of radar level gauge is more accurate.Second compression sky
The air of compression is introduced limestone powder bin 1 by the switch of the second once door 122 by gas anti-block apparatus 112, blows
Dissipate the buildup on the tuning fork being accumulated in the first tuning-fork type level switch 91 so that the first tuning-fork type material position is opened
The measurement data of pass 91 is more accurate.3rd compressed air anti-block apparatus 113 is by the 3rd once the opening of door 123
Close and the air of compression is introduced limestone powder bin 1, dispelled the sound being accumulated in the second tuning-fork type level switch 92
Buildup on fork so that the measurement data of the second tuning-fork type level switch 92 is more accurate.By four compressions
Air anti-block apparatus, can be prevented effectively from level-sensing device and occur after buildup lying about, reporting by mistake, make level-sensing device report
The data sent are more accurate.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for this
For the technical staff in field, the present invention can have various modifications and variations.All spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. made, should be included in the protection of the present invention
Within the scope of.
Claims (8)
1. an anti-blocking multistage combined apparatus for measuring charge level, it is characterised in that including:
Radar level gauge, it includes gauge outfit (2), extension tube (7) and radar probe (8), described gauge outfit
(2) connecting with one end of described extension tube (7), described gauge outfit (2) and described extension tube (7) are all
Being positioned at the center position of limestone powder bin (1) top, one end of described gauge outfit (2) is fixed with flange
(101), the top of described limestone powder bin (1) is fixed with the first welded flange (51), described gauge outfit
(2) it is fixed on described Calx by described first flange (101) and described first welded flange (51)
On the outer wall at stone powder storehouse (1) top, described radar probe (8) and the other end of described extension tube (7)
Connecting, described radar probe (8) is inserted perpendicularly in described limestone powder bin (1) and is positioned at described Calx
In stone powder storehouse (1) on material position；
First tuning fork apparatus for measuring charge level, it includes the first feeding pipeline and the first tuning-fork type level switch
(91), the entrance of described first feeding pipeline inclines relative to the right sidewall of described limestone powder bin (1)
Tiltedly arrange, and with described limestone powder bin (1) the most angled A, described first feeding pipeline
Outlet be fixed with the second welded flange (52), described first tuning-fork type level switch (91) is arranged on institute
Stating on the first feeding pipeline and fix with described first feeding pipeline and be connected, described first tuning-fork type material position is opened
The tuning fork closing (91) stretches into described first feeding pipeline, described first tuning-fork type level switch (91)
Axis and the dead in line of described first feeding pipeline, described first tuning-fork type level switch (91) is upper solid
Surely there are the second flange (102), described second flange (102) and described second welded flange (52) fixing
Connect, the distance between the right sidewall of described second flange (102) and described limestone powder bin (1)
For L1；
Second tuning fork apparatus for measuring charge level, it includes the second feeding pipeline and the second tuning-fork type level switch
(92), the entrance of described second feeding pipeline inclines relative to the right sidewall of described limestone powder bin (1)
Tiltedly arrange, and with described limestone powder bin (1) the most angled B, described second feeding pipeline
Outlet be fixed with the 3rd welded flange (53), described second tuning-fork type level switch (92) is arranged on institute
Stating on the second feeding pipeline and fix with described second feeding pipeline and be connected, described second tuning-fork type material position is opened
The tuning fork closing (92) stretches into described second feeding pipeline, described second tuning-fork type level switch (92)
Axis and the dead in line of described second feeding pipeline, described second tuning-fork type level switch (92) is upper solid
Surely there are three-flange (103), described three-flange (103) and described 3rd welded flange (53) fixing
Connect, the distance between the right sidewall of described three-flange (103) and described limestone powder bin (1)
For L2；
First compressed air anti-block apparatus (111), its one end connects compressed air, described first compression sky
The other end of gas anti-block apparatus (111) inserts institute from the left side sidewall horizontal of described limestone powder bin (1)
Stating in limestone powder bin (1), the other end of described first compressed air anti-block apparatus (111) is with described
The lower end of radar probe (8) is relative；
Second compressed air anti-block apparatus (112), its one end connects compressed air, described second compression sky
The other end of gas anti-block apparatus (112) inserts institute from the left side sidewall horizontal of described limestone powder bin (1)
Stating in limestone powder bin (1), the other end of described second compressed air anti-block apparatus (112) is with described
The tuning fork of the first tuning-fork type level switch (91) is relative；
3rd compressed air anti-block apparatus (113), its one end connects compressed air, described 3rd compression sky
The other end of gas anti-block apparatus (113) inserts institute from the left side sidewall horizontal of described limestone powder bin (1)
Stating in limestone powder bin (1), the other end of described 3rd compressed air anti-block apparatus (113) is with described
The tuning fork of the second tuning-fork type level switch (92) is relative；
4th compressed air anti-block apparatus (114), its one end connects compressed air, described 4th compression sky
The other end of gas anti-block apparatus (114) inserts described stone from the right sidewall of described limestone powder bin (1)
In lime stone powder cabin (1), the other end of described 4th compressed air anti-block apparatus (114) and described radar
The upper end of probe (8) is relative；
Wherein, described angle A and described angle B are equal, and described distance L1 and described distance L2 are equal.
Multistage combined apparatus for measuring charge level the most according to claim 1, it is characterised in that described
Angle A and described angle B are 15 °.
Multistage combined apparatus for measuring charge level the most according to claim 1, it is characterised in that described
Distance L1 and described distance L2 are 100mm.
Multistage combined apparatus for measuring charge level the most according to claim 1, it is characterised in that described
First compressed air anti-block apparatus (111) is provided with the first once door (121), described second compressed air
Anti-block apparatus (112) is provided with the second once door (122), described 3rd compressed air anti-block apparatus (113)
Being provided with the 3rd once door (123), described 4th compressed air anti-block apparatus (114) is provided with ball valve (13).
Multistage combined apparatus for measuring charge level the most according to claim 4, it is characterised in that described
First once door (121), the described second once door (122), the described 3rd once door (123) and described
It is outside that ball valve (13) is respectively positioned on described limestone powder bin (1).
Multistage combined apparatus for measuring charge level the most according to claim 1, it is characterised in that described
First flange (101) and described first welded flange (51) connect by bolt (4) is fixing, described
Second flange (102) and described second welded flange (52) connect by bolt (4) is fixing, described
Three-flange (103) and described 3rd welded flange (53) connect by bolt (4) is fixing.
Multistage combined apparatus for measuring charge level the most according to claim 6, it is characterised in that described
Flange gasket (3) it is provided with between first flange (101) and described first welded flange (51), described
Flange gasket (3) it is provided with between second flange (102) and described second welded flange (52), described
It is provided with flange gasket (3) between three-flange (103) and described 3rd welded flange (53).
Multistage combined apparatus for measuring charge level the most according to claim 1, it is characterised in that also wrap
Including heat-insulation layer (6), described heat-insulation layer (6) is positioned on the outer wall of described limestone powder bin (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610281599.XA CN105928588A (en) | 2016-04-29 | 2016-04-29 | Multi-stage combined type anti-blocking material level measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610281599.XA CN105928588A (en) | 2016-04-29 | 2016-04-29 | Multi-stage combined type anti-blocking material level measuring device |
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| CN105928588A true CN105928588A (en) | 2016-09-07 |
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| CN201610281599.XA Pending CN105928588A (en) | 2016-04-29 | 2016-04-29 | Multi-stage combined type anti-blocking material level measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113734641A (en) * | 2021-09-13 | 2021-12-03 | 郑州中远防务材料有限公司 | Powder feed bin with material level appearance cleaning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113734641A (en) * | 2021-09-13 | 2021-12-03 | 郑州中远防务材料有限公司 | Powder feed bin with material level appearance cleaning device |
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