GB1580507A - Tapered silo - Google Patents
Tapered silo Download PDFInfo
- Publication number
- GB1580507A GB1580507A GB2979/78A GB297978A GB1580507A GB 1580507 A GB1580507 A GB 1580507A GB 2979/78 A GB2979/78 A GB 2979/78A GB 297978 A GB297978 A GB 297978A GB 1580507 A GB1580507 A GB 1580507A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silo
- conical
- screw
- outlet port
- axis
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/54—Large containers characterised by means facilitating filling or emptying
- B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
- B65D88/68—Large containers characterised by means facilitating filling or emptying preventing bridge formation using rotating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/92—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws
- B01F27/921—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws with helices centrally mounted in the receptacle
- B01F27/9212—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws with helices centrally mounted in the receptacle with conical helices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Description
(54) TAPERED SILO
(71) We, SOREMA, S.r.l., a Company organised under the laws of the Republic of
Italy, of 11 Via Comana, Erba, Como, Italy, do hereby declare the invention, for which we pray that a Patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a silo having a tapered bottom end, which is particularly adapted, even if not exclusively, for smallsized plastics materials having a high degree of stickiness, humidity and electrostaticity.
It is known that the storage in silo of plastics materials having the characteristics enumerated above involves considerable problems as regards the metered dispensing of the material once the storage period comes to an end.
By virtue of their characteristics, the individual small pieces of material tend to stick to each other, thus forming in the low section of the silo a single agglomeration of solids which acts like a "bridge" or a "plug" for the overlying stock.
This phenomenon creates, as it is universally recognized in the art, the necessity of keeping the material continually stirred, especially in the lower section of the silos having a tapered bottom, wherein the occurrence of bridging is more likely.
The approaches as suggested heretofore in the conventional silos are not fully satisfactory under this particular respect, since they are unable to maintain the entire mass of material in the desirable status of stirring, but only portions of the material are influenced and, in addition, motors of high power are required in order that the stirrers may prop erlbe actuated.
The -principal object of the present invention is to provide a tapered-bottom silo which is particularly, even if not quite exclusively, adapted to plastics materials of the characteristics enumerated above and in which the problem of stirring the material is brilliantly and thoroughly solved.
Another object of the present invention is, then, to provide a silo of the kind referred to above, which is also capable of ensuring a particularly accurate and constant metering of the material to be dispensed from time to time.
According to the invention, these objects are achieved by means of a tapered-bottom silo, particularly suitable for small sized plastics material having characteristics of low density and a high degree of stickiness, humidity and electrostaticity, characterised in that it comprises a helical screw stirring member coaxially located within the conical silo bottom, the diameter of said stirring member increasing progressively from its lower end to its upper end whereby its periphery traverses a conical path as the stirring member is rotated about said axis to produce an upward motion of the material engaged by its helical vane away from an outlet port located laterally relative to said stirring member at the lower end of the conical silo bottom, means being provided for ejecting and delivering the material received from said outlet port, said means extending laterally of the axis of said silo.
The use, as suggested herein, of a helical stirrer whose periphery lies in a conical surface solves the problem of stirring the material which is held in the tapered end of the silo.
Such a stirrer, in fact, creates within the material concerned a continuous lifting motion, and an appropriate sizing of the conical peripheral surface of the helix relative to the silo bottom can extend such a motion laterally in such a way as to involve all the material contained in the tapered end of the silo, with the only exception of a narrow peripheral annulus along which the material, conversely, is enabled to fall by the gravity pull only and thus to reach the outlet port and to pass therethrough in order that a constant output may be achieved and thereby a metering of the delivery which is also constant. No undesirable clogging or bridging phenomena are experienced so that the silo is constantly maintained under quite satisfactory working conditions.Inasmuch as, on the other hand, a comparatively slow motion of the material is sufficient, the use of a driving motor having a limited power is also appropriate, the result being that the silo becomes less expensive and the power demand is considerably reduced.
The characteristics of the present invention will become more clearly apparent from the ensuing detailed description of a practical embodiment thereof which is shown by way of example only in the accompanying drawings.
In the drawings:
FIGURE 1 is an axial cross-sectional view of the lower portion of a silo according to this invention.
FIGURE 2 shows the same lower portion of the silo in transversal cross-sectional view taken along the line II-II of FIGURE 1.
FIGURE 3 shows the outlet section of the silo in cross-sectional view, taken along the line III-III of FIGURE 2.
The silo as depicted in the drawings essentially comprises a cylindrical wall 1, which is axially developed almost along the entire vertical extension of the silo, with the only exception of a bottom section 2, having a tapered wall 3 which is terminated at its end buy a squared section 4 (FIGURES 1 and 2).
A plate 5, having a rectangular window 6 which is laterally offset towards the squared wall 4 closes at the bottom the tapered end 2 of the silo and supports in a central position, that is to say along the axis of the conical wall 3 and of the overlying cylindrical wall 1, a motor 7 intended to drive in rotation a helical screw stirrer 8 located coaxially within the conical bottom 2.
The stirrer in question comprises a central shaft 9 borne by the motor 7 and maintained in a true axial position by three arms 10 (only two are shown in FIGURE 1) angularly spaced apart through 120 degrees from each other and fastened by plates 11 to the junction area between the walls 1 and 3. Around the shaft 9 there is a helical vane 12 which is fastened to such a shaft by means of radial spokes 13.
To the top of shaft 9 are also fastened two paddles 14 and 15 having different radii, which provide stirring of the material above the arms 10. In such an area a level indicator 16 is additionally provided.
Beneath the plate 5 and in registry with the rectangular window 6, there is arranged, lastly, in a transversal direction, a dispensing screw 17 of cylindrical form, which is rotatably mounted within a cylindrical box 18: the latter has an inlet mouth 19 and an outlet port 20 and the screw 17 is driven by a motor 21 (FIGURES 2 and 3).
In operation, the motor 7 rotates, in the direction shown by the arrow F in FIGURE 1 the helical stirrer 8, which induces a slow upward motion of the material that stays in the inside of the conical enveloping surface of the vane 12. The material then falls by gravity along the conical sidewall 3 and creates an outlet stream with a constant rate of output through the outlet port 6. The constancy of the rate of flow is ensured by the noncompressed conditions to which the material is subjected in the conical section 2 due to the effects of the stir created by the screw 8 and the bearing action of the overlying material in the cylindrical section 1, as stirred by the paddles 14, 15.
It should be noticed that the movement created by the stirrer 8 also provides, if required, the admixture of possible different materials introduced in the silo together. The transversal screw 17, lastly, provides to delivers constant metered quantities of material to the dispensing port 20.
WHAT WE CLAIM IS:
1. A tapered-bottom silo, particularly suitable for small sized plastics material having characteristics of low density and a high degree of stickiness, humidity and electrostaticity, characterised in that it comprises a helical screw stirring member coaxially located within the conical silo bottom, the diameter of said stirring member increasing progressively from its lower end to its upper end whereby its periphery traverses a conical path as the stirring member is rotated about said axis to produce an upward motion of the material engaged by its helical vane away from an outlet port located laterally relative to said stirring member at the lower end of the conical silo bottom, means being provided for ejecting and delivering the material received from said outlet port, said means extending laterally of the axis of said silo.
2. A silo according to claim 1, characterised in that said delivering means comprises a dispensing screw of cylindrical form arranged with its axis transversely of the axis of said silo beneath said outlet port.
3. A silo according to claims 1 and 2, substantially as hereinbefore described and illustrated in the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (3)
1. A tapered-bottom silo, particularly suitable for small sized plastics material having characteristics of low density and a high degree of stickiness, humidity and electrostaticity, characterised in that it comprises a helical screw stirring member coaxially located within the conical silo bottom, the diameter of said stirring member increasing progressively from its lower end to its upper end whereby its periphery traverses a conical path as the stirring member is rotated about said axis to produce an upward motion of the material engaged by its helical vane away from an outlet port located laterally relative to said stirring member at the lower end of the conical silo bottom, means being provided for ejecting and delivering the material received from said outlet port, said means extending laterally of the axis of said silo.
2. A silo according to claim 1, characterised in that said delivering means comprises a dispensing screw of cylindrical form arranged with its axis transversely of the axis of said silo beneath said outlet port.
3. A silo according to claims 1 and 2, substantially as hereinbefore described and illustrated in the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT20041/77A IT1078053B (en) | 1977-02-08 | 1977-02-08 | CONICAL BOTTOM SILO, PARTICULARLY SUITABLE FOR SMALL PIECE PLASTIC MATERIAL WITH LOW DENSITY FEATURES AND HIGH DEGREE OF STICKNESS, HUMIDITY AND ELECTROSTATICITY |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1580507A true GB1580507A (en) | 1980-12-03 |
Family
ID=11163340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2979/78A Expired GB1580507A (en) | 1977-02-08 | 1978-01-25 | Tapered silo |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE2803166A1 (en) |
ES (1) | ES466747A1 (en) |
FR (1) | FR2379452A1 (en) |
GB (1) | GB1580507A (en) |
IT (1) | IT1078053B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002096787A1 (en) * | 2001-05-30 | 2002-12-05 | Schenck Process Gmbh | Dosing device |
CN101823606A (en) * | 2010-04-12 | 2010-09-08 | 杭州震乾科技有限公司 | Blade stirring type pneumatic conveyor for easy caking materials |
CN102718001A (en) * | 2012-06-19 | 2012-10-10 | 程晓堂 | Blade rotary solid material conveying device with function of intelligently clearing blockage |
WO2015170986A3 (en) * | 2014-05-08 | 2016-02-04 | Zuidema Casper Johan | Mixing device, mixing hopper and dosing container |
JP2017096527A (en) * | 2015-11-19 | 2017-06-01 | 株式会社ササキコーポレーション | Combustion device |
CN107985831A (en) * | 2017-12-25 | 2018-05-04 | 安徽赛月环境科技有限公司 | A kind of spiral hopper-type discharger |
CN113514301A (en) * | 2021-07-09 | 2021-10-19 | 西安热工研究院有限公司 | System and method for improving sample preparation representativeness of mechanical sample preparation device |
CN114632940A (en) * | 2022-03-18 | 2022-06-17 | 陕西智奇开物新材料有限公司 | Spiral powder feeding device of equipment for preparing spherical alloy powder by fusing drop tube |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2611675B1 (en) * | 1987-02-27 | 1989-12-29 | Dussau Christian | PNEUMATIC DISPENSER FOR GRANULAR OR POWDERY PRODUCTS OF THE PULSE RATE TYPE |
FR2682940B1 (en) * | 1991-10-28 | 1994-02-04 | Symac | DEVICE FOR THE EXTRACTION OF A PRODUCT IN THE DIVIDED CONDITION AND FOR ITS VOLUMETRIC DOSING. |
US5501405A (en) * | 1994-07-05 | 1996-03-26 | Douglas Dynamics, Inc. | Dispenser apparatus for spreading particulate material |
DE102006007485B3 (en) * | 2006-02-17 | 2007-08-02 | Atc Establishment | Portioning device in particular for fine powder, comprises specifically positioned sieve and two conveyor worms |
CN102774578A (en) * | 2012-06-29 | 2012-11-14 | 常州环生科创石墨设备有限公司 | Bridge prevention device for salt discharging structure |
FR3071236B1 (en) * | 2017-09-20 | 2020-11-06 | Commissariat Energie Atomique | INJECTION CONE POWDER FEEDING SYSTEM IN DENSE PHASE HOUSING A ROTATING CONICAL PROPELLER |
CN108579559A (en) * | 2018-05-04 | 2018-09-28 | 信易电热机械有限公司 | A kind of hybrid storage vat |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE507866C (en) * | 1930-09-20 | Schumag Schumacher Metallwerke | Device for loosening bulky goods when feeding | |
GB547914A (en) * | 1941-03-25 | 1942-09-17 | Edward Mortimer Hobbs | Improvements in apparatus for feeding powdered material |
DE1180321B (en) * | 1961-04-07 | 1964-10-22 | Robert Willi | Silo with discharge device |
FR2335431A2 (en) * | 1975-12-16 | 1977-07-15 | Taupin Jean Paul | FLUIDIFICATION AND EXTRACTION DEVICE FOR MATERIAL IN A DIVIDED STATE |
-
1977
- 1977-02-08 IT IT20041/77A patent/IT1078053B/en active
-
1978
- 1978-01-25 DE DE19782803166 patent/DE2803166A1/en active Granted
- 1978-01-25 GB GB2979/78A patent/GB1580507A/en not_active Expired
- 1978-02-07 ES ES466747A patent/ES466747A1/en not_active Expired
- 1978-02-08 FR FR7803576A patent/FR2379452A1/en active Granted
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002096787A1 (en) * | 2001-05-30 | 2002-12-05 | Schenck Process Gmbh | Dosing device |
CN101823606A (en) * | 2010-04-12 | 2010-09-08 | 杭州震乾科技有限公司 | Blade stirring type pneumatic conveyor for easy caking materials |
CN101823606B (en) * | 2010-04-12 | 2012-02-15 | 杭州震乾科技有限公司 | Blade stirring type pneumatic conveyor for easy caking materials |
CN102718001A (en) * | 2012-06-19 | 2012-10-10 | 程晓堂 | Blade rotary solid material conveying device with function of intelligently clearing blockage |
WO2015170986A3 (en) * | 2014-05-08 | 2016-02-04 | Zuidema Casper Johan | Mixing device, mixing hopper and dosing container |
US11395995B2 (en) | 2014-05-08 | 2022-07-26 | Casper Johan Zuidema | Mixing device, mixing hopper and dosing container |
JP2017096527A (en) * | 2015-11-19 | 2017-06-01 | 株式会社ササキコーポレーション | Combustion device |
CN107985831A (en) * | 2017-12-25 | 2018-05-04 | 安徽赛月环境科技有限公司 | A kind of spiral hopper-type discharger |
CN113514301A (en) * | 2021-07-09 | 2021-10-19 | 西安热工研究院有限公司 | System and method for improving sample preparation representativeness of mechanical sample preparation device |
CN114632940A (en) * | 2022-03-18 | 2022-06-17 | 陕西智奇开物新材料有限公司 | Spiral powder feeding device of equipment for preparing spherical alloy powder by fusing drop tube |
Also Published As
Publication number | Publication date |
---|---|
DE2803166A1 (en) | 1978-08-10 |
FR2379452B1 (en) | 1984-12-28 |
DE2803166C2 (en) | 1988-10-13 |
IT1078053B (en) | 1985-05-08 |
FR2379452A1 (en) | 1978-09-01 |
ES466747A1 (en) | 1978-10-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960125 |