CN108775597A - A kind of blanking system for biological particles stove - Google Patents
A kind of blanking system for biological particles stove Download PDFInfo
- Publication number
- CN108775597A CN108775597A CN201810471906.XA CN201810471906A CN108775597A CN 108775597 A CN108775597 A CN 108775597A CN 201810471906 A CN201810471906 A CN 201810471906A CN 108775597 A CN108775597 A CN 108775597A
- Authority
- CN
- China
- Prior art keywords
- blanking
- hopper
- biological particles
- control panel
- discharge channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/10—Supply line fittings
- F23K2203/102—Flashback safety, e.g. inertizing devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention discloses a kind of blanking systems for biological particles stove, including hopper (1), blanking groove (2) in hopper (1) outlet lower section is set, discharge channel (3) in blanking groove (2) outlet lower section is set, and the motor (4) rotated for controlling blanking groove (2)；Blanking groove (2) is cylindrical, using the axis of cylinder as rotary shaft, it is rotated perpendicular to ground level, blanking groove (2) is divided into several blanking bins (22), blanking bin (22) to be open outwardly by blanking bin partition board (21)；Burner feed inlet is arranged in discharge channel (3) outlet lower section.Using rotary unloading slot as architecture basics, it ensure that the duration of charging, do not get stuck, it is securely and reliably, easy to operate.
Description
Technical field
The present invention relates to biomass solid forming burning heat supply stove fields, and in particular to a kind of blanking of solid molding fuel
System.
Background technology
Biomass solid formed fuel is that the agricultural wastes such as stalk, rice husk, sawdust are compressed into spy by special equipment
Shape shape to increase the solid fuel of its density, with efficient, clean, igniting is easy, CO2The advantages that discharge, alternative coal
Equal fossil fuels are applied to the industrial circles such as civil fields and boiler combustion, power generation such as cooking, heating.
Currently, the biomass combustion machine used in the market is mainly spiral feeding manner, the fuel in hopper passes through spiral shell
Bar is delivered to combustion chamber, when the structure of feeding screw or its it is unreasonable in use when, material is just likely to occur in tube body
Screw movement is even skidded and is regurgitated.It is by two kinds of movements of rotary motion and axial movement that material, which carries out spiral charging,
It completes jointly, and rotary motion is to cause material by spiral since there is excessive rubbing actions between spiral and material
It drives and rotates together；Axial movement is then since the effect of axial thrust load caused by helical rotation pushes forward material.
When the structure of feeding screw or its it is unreasonable in use when, screw is often occupied an leading position, and move axially then
It is in a disadvantageous position.At this moment material is just likely to occur screw movement in tube body, or even has skidded and regurgitate.It is this in order to change
State ensures shifting movement before material is successfully realized, this just must try to make the frictional resistance of spiral and material to become smaller to get over
It is good；Axial rub resistance between helical tube body and material is also the smaller the better；And the tangential resistance of helical tube body and material is then got over
It is big more advantageous.While charging, the high temperature that indoor fuel combustion generates that burns easily is tempered into material bin, directly burning biology
Matter particle, causes waste of fuel, and tempering causes safety to reduce, and feeding efficiency is also relatively low, influences to produce, and when use is easy
Abrasion, is easy to get stuck, motor easy burn-out, failure is more, and service life is short.
Application No. is the inventions of CN201410388028.7 to provide a kind of biomass combustion machine rotating disc type feed system, packet
Rack, governor, loading plate, discharge tray are included, the loading plate and discharge tray pass through logical among upper and lower charging tray by transmission shaft
Hole is fastened on rack；Circular through hole is provided among the loading plate, the through-hole is equipped with top bearing cover；Under described
Charging tray side is welded with annulus, and turntable is equipped in the annulus.Several feeding ports are set in loading plate, are arranged one in discharge tray
A feed opening, loading plate is rotatable, and discharge tray does not rotate, and when feeding port rotates to feed opening position, completes blanking.The invention
Can not accomplish uninterrupted feeding, at the same time, when feeding is made a slip of the tongue it is shallow when, hold that fuel is very few, and blanking rate is low；Work as feeding port
Too deep, loading plate also increases weight, and the active force for rotating needs increases, and increases the pressure of motor.
Invention content
In order to solve the problems in the prior art, the present invention provides one kind not to get stuck, uniformly uninterrupted feeding, safety can
It leans on, biomass solid formed fuel blanking system easy to operate.Specific technical solution is as follows：
A kind of blanking system for biological particles stove, including hopper, the blanking groove being arranged below hopper outlet, if
The discharge channel below blanking groove outlet is set, and the motor rotated for controlling blanking groove；Blanking groove is cylindrical, with
The axis of cylinder is rotary shaft, is rotated perpendicular to ground level, and blanking groove is divided into several blanking bins by blanking bin partition board, under
Feed bin is open outwardly；Burner feed inlet is arranged in discharge channel outlet lower section.
The present invention transports fuel by the blanking bin of rotation, and rotary shaft is fixed, and blanking bin is rotating to upper
When setting, fuel is added, position of arriving that Open Side Down clockwise or counterclockwise is correspondingly arranged with discharge channel entry position as blanking
Slot exports, and fuel is transferred to discharge channel from blanking groove under the effect of gravity；At the same time, the blanking bin of next cis-position is also successive
Uppermost position in fig-ure is rotated to, fuel is added, rotates to exit, ensures the continuity of discharge channel.Fuel is transported to combustion by discharge channel
Device is burnt, blanking is completed.Can be according to different fuel the characteristics of, considers that environment etc. is each with reference to the burning feature of different burners
Different rotating speeds is arranged for motor in item parameter.Ensure invariablenes turning speed, it is isogonal in discharge channel, it is ensured that even
Fast blanking.The setting of blanking bin partition board has certain fireproofing function, can be to avoid under emergency situations, and burner flame falls to fire
Into blanking bin.
Preferably, blanking bin partition board has 60 ° of angles, blanking bin partition board inclined direction and blanking with blanking groove rotation axial section
Slot direction of rotation is identical.
It can both ensure that material is not fallen in rotation process in this way, and there is certain impetus for rotation, subtract
Small rotating friction force；Meanwhile when toward discharge channel transmission material, material is under the effect of gravity, it is easier to transmit, prevent from getting stuck.
Preferably, hopper lower end is provided with elastic spring I, and the free end of elastic spring I extends in blanking bin.
Lower hopper forms inverted trapezoidal rod structure by inclined plate and straight panel, is respectively provided with blanking groove contact position below inclined plate and straight panel
Flexible reed I.Elastic spring I below inclined plate can prevent particulate material in blanking groove rotary course, enter too early next
A blanking bin, ensure each blanking bin in rotary course multiplies doses.Elastic spring I below straight panel, can be by vertical state
Material fell into blanking groove, avoid getting stuck；Irregular material can be also allowed to enter simultaneously.In addition to this, elastic spring I and blanking bin
Baffle contacts are arranged, and whenever blanking bin rotation, stir elastic spring vibration, also have oscillation action to the fuel in hopper, avoid
It gets stuck.
Preferably, discharge channel inlet lower end is provided with elastic spring II, and the free end of elastic spring II extends to blanking
In storehouse, prevent fuel from accumulating for vibrating；Upper end is provided with upper stop piece, for preventing fuel from popping up discharge channel.
When blanking bin rotates to outlet port, start to feed to discharge channel, it is contemplated that the scrambling of material, sliding are bad
It may be stuck in discharge channel, so spring leaf II is arranged in discharge channel lower end, shrapnel, shrapnel vibration are just stirred in blanking bin edge
Material is slided.Blanking bin often vibrates, and spring leaf just vibrates, and granular fuel is prevented to be deposited in discharge channel.Simultaneously
Have in special circumstances, particulate material is stuck between blanking bin partition board and discharge channel lower end, is blocked using spring leaf, and when rotation blocks material
Into defective material device is collected, reused after rotation.The upper stop piece of upper end setting mainly allows the particle bounced to fall, and prevents fuel from sending out
Life is poured down or forth.
Preferably, blanking system further includes discharge quantity control panel, and discharge quantity control panel is inclined at hopper and blanking groove
Contact position；Discharge quantity control panel includes control panel, is arranged and is being controlled in the elastic spring of control panel with blanking groove contact position and setting
Making sheet lower surface is used to control the tension spring at the angle of inclination of discharge quantity control panel.
Discharge quantity control panel not only can guarantee that irregular material entered blanking groove, but also can guarantee and do not block material, preferably control
Grain inlet.Discharge quantity control panel has certain angle with blanking bin, is uniformly stepped into convenient for particle.Tension spring once in a while expect it is more,
Or when having special long material to block, the angle of discharge quantity control panel is controlled, ensure particle by not getting stuck.
Preferably, the elastic spring of discharge quantity control panel is made of a plurality of reed, and every reed is by upper layer reed and lower layer
Reed is constituted, and the length of upper layer reed is more than the length of lower layer's reed.
Discharge quantity control panel mainly utilizes Double-layer elastic to control, wherein and elastic spring is made of a plurality of, if it is monolithic,
Rigidity is too big, cannot control different material and enter, and is also easy into not going or inlet is excessive.Inlet amount is easy to control by a plurality of form
Also it does not get stuck.A plurality of reed is made of bilayer, and one is long and the other is short, ensures that reed is indeformable when reed being made to expect more under special circumstances.
Preferably, hopper includes loading hopper and lower hopper；Loading hopper is in funnel-form, for adding fuel；Lower hopper is by one
A inclined plate and three straight panels constitute hollow inverted trapezoidal column funnel；Lower hopper upper end connects loading hopper lower end.
Funnel is arranged in loading hopper, increases the convenience of charging, avoids pouring down or forth during charging, lower hopper is set
It sets in loading hopper lower end, in such a way that inclined plate and straight panel are combined, inclined plate slides into blanking groove convenient for particle, and straight panel prevents excessively
Charging, while straightened portion particulate material can be fallen down into blanking groove, it avoids getting stuck.If blanking groove is to rotate clockwise,
The feeding manner being combined with inclined plate in left side, straight panel on right side, inclined plate should be arranged in straight panel, decrease blanking groove rotation
Resistance.
Preferably, blanking system further includes driving lever, for stirring the fuel in hopper.
Charging spout both sides can be located at by the way that cam is arranged on the rotary shaft, and charging spout synchronous rotary is arranged on cam
There are protrusion and recess；Driving lever lower end is slidably connected cam, rotates upper and lower translation with cam, the fuel in hopper is stirred in upper end.By
In the scrambling of particulate material, also it is easy to fork in hopper not toward whereabouts, feed is caused to interrupt.Increasing cam makes driving lever or more
Movement, cam can not stall, and driving lever slides up and down, and particulate material is made aprowl to fall, and avoids getting stuck.
Driving lever can also be respectively set by the fixing end of the spring leaf I below the inclined plate of lower hopper and straight panel, be used for
The fuel particle in lower hopper is stirred with the vibration of spring leaf I.Since the free end of spring leaf I is set with blanking bin baffle contacts
It sets, feed bin rotation can cause spring leaf I to vibrate, and then cause two driving lever vibrations, stir particulate material and enter feed bin, avoid generating
It gets stuck.
Preferably, driving lever upper end is provided with shift fork.
Shift fork is set in driving lever upper end, convenient for preferably stirring particulate material, to greatly reduce the probability that gets stuck.Shift fork number
Amount, length can be adjusted for the purpose of ensureing particles fall according to different situations.
Preferably, fire prevention catch being set in discharge channel exit, the upper end for catch of preventing fires is fixed on discharge channel outlet upper end,
Catch lower end is prevented fires as free end.
Catch is prevented fires by fuel, while not influencing discharge channel blanking, completely cuts off the flame of burner, prevents flame from burning
Into blanking device.
For the present invention in use, biomass solid formed fuel is added in hopper, fuel enters rotation under the effect of gravity
The blanking bin of blanking groove uppermost position in fig-ure, as blanking groove rotates, after addition is a certain amount of, which turns to discharge channel import
Position, under gravity, fuel slides into discharge channel, then is transmitted to burner by discharge channel；At the same time, under next cis-position
Feed bin rotates to blanking groove uppermost position in fig-ure successively, and fuel is added, into cycle, to ensure the duration of charging.
Beneficial effects of the present invention are：
(1) using rotary unloading slot as architecture basics, it ensure that the duration of charging, meanwhile, ensure motor rotation speed not
Become, the discharge channel gradient is constant, can accomplish uniform speed feeding.
(2) present invention adds spring leaf in multiple positions, and driving lever is added in hopper, substantially avoided the possibility to get stuck
Property, it is further ensured that the duration of equipment operation.
(3) when occurring unexpected, fire prevention catch and blanking bin partition board can prevent the fuel in flame combustion to hopper, rise
To iris action, the safety that equipment uses ensure that.
Description of the drawings
Fig. 1 is a kind of dimensional structure diagram of blanking system for biological particles stove；
Fig. 2 is a kind of positive structure diagram of blanking system for biological particles stove.
Reference numeral：
1, hopper；11, elastic spring I；12, loading hopper；13, lower hopper；2, blanking groove；21, blanking bin partition board；22, under
Feed bin；3, discharge channel；4, motor.
Specific implementation mode
Embodiment 1
The blanking groove below the outlet of hopper 1 is arranged in a kind of blanking system for biological particles stove, including hopper 1
2, the discharge channel 3 below the outlet of blanking groove 2 is set, and the motor 4 rotated for controlling blanking groove 2；Blanking groove 2 is in
It is cylindric, it using the axis of cylinder as rotary shaft, is rotated perpendicular to ground level, if blanking groove 2 is divided by blanking bin partition board 21
Dry blanking bin 22, blanking bin 22 are open outwardly；Burner feed inlet is arranged in the outlet of discharge channel 3 lower section.
Blanking bin partition board 21 rotates axial section with blanking groove 2 60 ° of angles, 21 inclined direction of blanking bin partition board and blanking groove
2 direction of rotation are identical.
1 lower end of hopper is provided with elastic spring I 11, and the free end of elastic spring I 11 extends in blanking bin 22.
3 inlet lower end of discharge channel is provided with elastic spring II, and the free end of elastic spring II extends in blanking bin 22,
Prevent fuel from accumulating for vibrating；Upper end is provided with upper stop piece, for preventing fuel from popping up discharge channel 3.
Hopper 1 includes loading hopper 12 and lower hopper 13；Loading hopper 12 is in funnel-form, for adding fuel；Lower hopper 13 by
One inclined plate and three straight panels constitute hollow inverted trapezoidal column funnel；13 upper end of lower hopper connects 12 lower end of loading hopper.
Fire prevention catch is set in 3 exit of discharge channel, the upper end for catch of preventing fires is fixed on discharge channel 3 and exports upper end, fire prevention
Catch lower end is free end.
Embodiment 2
A kind of blanking system for biological particles stove, with embodiment 1 difference lies in：
Blanking system further includes discharge quantity control panel, and discharge quantity control panel is inclined at hopper 1 and blanking groove 2 contacts
Place；Discharge quantity control panel includes control panel, is arranged in the elastic spring of control panel Yu 2 contact position of blanking groove and setting in control panel
Lower surface is used to control the tension spring at the angle of inclination of discharge quantity control panel.
The elastic spring of discharge quantity control panel is made of a plurality of reed, and every reed is by upper layer reed and lower layer's reed structure
At the length of upper layer reed is more than the length of lower layer's reed.
Embodiment 3
A kind of blanking system for biological particles stove, with embodiment 1 difference lies in：
Blanking system further includes cam and driving lever, and for stirring the fuel in hopper 1, cam is arranged on the rotary shaft, position
In charging spout both sides, with charging spout synchronous rotary, cam is provided with protrusion and recess；Driving lever lower end is slidably connected cam, with convex
Wheel rotation upper and lower translation, the fuel in hopper 1 is stirred in upper end.Driving lever upper end is provided with shift fork.
Embodiment 4
A kind of blanking system for biological particles stove, with embodiment 1 difference lies in：
Driving lever is respectively set in the fixing end of spring leaf I below the inclined plate of lower hopper and straight panel, for spring leaf I
It vibrates and stirs the fuel particle in lower hopper.
Above-described embodiment is merely exemplary for the purpose of the present invention, and and not restrictive, its object is to allow be familiar with this
The understanding of technology cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.Not
In the case of being detached from claim limited range, those of ordinary skill in the art understand, any modification, the change that can be made
Change or equivalent, falls within protection scope of the present invention.
Claims (10)
1. a kind of blanking system for biological particles stove, it is characterised in that：Including hopper (1), it is arranged in the hopper (1)
The blanking groove (2) of lower section is exported, is arranged in the discharge channel (3) of the blanking groove (2) outlet lower section and for controlling the blanking
The motor (4) of slot (2) rotation；The blanking groove (2) is cylindrical to be carried out perpendicular to ground level using the axis of cylinder as rotary shaft
Rotation, the blanking groove (2) are divided into several blanking bins (22), blanking bin (22) opening court by blanking bin partition board (21)
Outside；Burner feed inlet is arranged in discharge channel (3) outlet lower section.
2. a kind of blanking system for biological particles stove according to claim 1, it is characterised in that：The blanking bin
The angle of partition board (21) and the blanking groove (2) rotation axial section is 60 °, blanking bin partition board (21) inclined direction with it is described
Blanking groove (2) direction of rotation is identical.
3. a kind of blanking system for biological particles stove according to claim 1, it is characterised in that：The hopper
(1) lower end is provided with elastic spring I (11), and the free end of the elastic spring I (11) extends in the blanking bin (22).
4. a kind of blanking system for biological particles stove according to claim 1, it is characterised in that：The discharge channel
(3) inlet lower end is provided with elastic spring II, and the free end of the elastic spring II extends in the blanking bin (22), uses
In by vibration prevent fuel from accumulating；Discharge channel (3) upper end is provided with upper stop piece, for preventing fuel from popping up the blanking
Road (3).
5. a kind of blanking system for biological particles stove according to claim 1, it is characterised in that：The blanking system
System further includes discharge quantity control panel, and the discharge quantity control panel is inclined at the hopper (1) and the blanking groove (2) contact
Place；The discharge quantity control panel includes control panel, and the elastic spring in the control panel and the blanking groove (2) contact position is arranged
It is used to control the tension spring at the angle of inclination of the discharge quantity control panel in the control panel lower surface with being arranged.
6. a kind of blanking system for biological particles stove according to claim 6, it is characterised in that：The discharge quantity
The elastic spring of control panel is made of a plurality of reed, and every reed is made of upper layer reed and lower layer's reed, the upper layer
The length of reed is more than the length of lower layer's reed.
7. a kind of blanking system for biological particles stove according to claim 1, it is characterised in that：The hopper
(1) include loading hopper (12) and lower hopper (13)；The loading hopper (12) is in funnel-form, for adding fuel；The lower hopper
(13) hollow inverted trapezoidal column funnel is constituted by an inclined plate and three straight panels；Lower hopper (13) upper end connects the loading hopper
(12) lower end.
8. a kind of blanking system for biological particles stove according to claim 1, it is characterised in that：The blanking system
System further includes the driving lever of the fuel for stirring the hopper (1).
9. a kind of blanking system for biological particles stove according to claim 8, it is characterised in that：In the driving lever
Upper end is provided with shift fork.
10. a kind of blanking system for biological particles stove according to claim 1, it is characterised in that：Under described
Material path (3) exit setting fire prevention catch, the fire prevention catch upper end are fixed on discharge channel (3) outlet upper end, the fire prevention gear
Piece lower end is free end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810471906.XA CN108775597A (en) | 2018-05-17 | 2018-05-17 | A kind of blanking system for biological particles stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810471906.XA CN108775597A (en) | 2018-05-17 | 2018-05-17 | A kind of blanking system for biological particles stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108775597A true CN108775597A (en) | 2018-11-09 |
Family
ID=64027216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810471906.XA Pending CN108775597A (en) | 2018-05-17 | 2018-05-17 | A kind of blanking system for biological particles stove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108775597A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114056893A (en) * | 2021-12-16 | 2022-02-18 | 芜湖市爱德运输机械有限公司 | Feeding structure of screw conveyor and screw conveyor |
| PL446154A1 (en) * | 2023-09-19 | 2024-06-03 | Politechnika Lubelska | Device for regulated supply of solid fuel to the furnace or boiler furnace |
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| EP2011391A2 (en) * | 2007-07-02 | 2009-01-07 | Suncue Company Ltd. | Feed hopper system |
| CN104456546A (en) * | 2014-11-27 | 2015-03-25 | 江苏太湖锅炉股份有限公司 | Suspension combustion biomass particle feeding structure |
| CN104791830A (en) * | 2015-04-28 | 2015-07-22 | 武安市嘉恒节能科技有限公司 | Automatic dual-purpose feed device of biomass fuel furnace |
| CN206160181U (en) * | 2016-10-16 | 2017-05-10 | 扬州汇聚热能设备有限公司 | Board -like anti -backfire living beings granule feed arrangement turns over |
| CN206488303U (en) * | 2016-08-29 | 2017-09-12 | 安徽金骏机械制造有限公司 | Biomass fuel boiler novel automatic feed mechanism |
| CN206669787U (en) * | 2017-04-19 | 2017-11-24 | 湖北天合嘉康能源科技股份有限公司 | A kind of anti-clogging and the biomass fuel drawing mechanism of idle running |
| CN208365571U (en) * | 2018-05-17 | 2019-01-11 | 北京国奥天开信息技术有限公司 | A kind of blanking system for biological particles furnace |
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2018
- 2018-05-17 CN CN201810471906.XA patent/CN108775597A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2011391A2 (en) * | 2007-07-02 | 2009-01-07 | Suncue Company Ltd. | Feed hopper system |
| CN104456546A (en) * | 2014-11-27 | 2015-03-25 | 江苏太湖锅炉股份有限公司 | Suspension combustion biomass particle feeding structure |
| CN104791830A (en) * | 2015-04-28 | 2015-07-22 | 武安市嘉恒节能科技有限公司 | Automatic dual-purpose feed device of biomass fuel furnace |
| CN206488303U (en) * | 2016-08-29 | 2017-09-12 | 安徽金骏机械制造有限公司 | Biomass fuel boiler novel automatic feed mechanism |
| CN206160181U (en) * | 2016-10-16 | 2017-05-10 | 扬州汇聚热能设备有限公司 | Board -like anti -backfire living beings granule feed arrangement turns over |
| CN206669787U (en) * | 2017-04-19 | 2017-11-24 | 湖北天合嘉康能源科技股份有限公司 | A kind of anti-clogging and the biomass fuel drawing mechanism of idle running |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114056893A (en) * | 2021-12-16 | 2022-02-18 | 芜湖市爱德运输机械有限公司 | Feeding structure of screw conveyor and screw conveyor |
| PL446154A1 (en) * | 2023-09-19 | 2024-06-03 | Politechnika Lubelska | Device for regulated supply of solid fuel to the furnace or boiler furnace |
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