EP0485288A1 - Einrichtung zum Speichern und Austragen von pulverförmigen Produkten - Google Patents

Einrichtung zum Speichern und Austragen von pulverförmigen Produkten Download PDF

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Publication number
EP0485288A1
EP0485288A1 EP91402976A EP91402976A EP0485288A1 EP 0485288 A1 EP0485288 A1 EP 0485288A1 EP 91402976 A EP91402976 A EP 91402976A EP 91402976 A EP91402976 A EP 91402976A EP 0485288 A1 EP0485288 A1 EP 0485288A1
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EP
European Patent Office
Prior art keywords
silo
rings
cap
flange
distribution
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.)
Withdrawn
Application number
EP91402976A
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English (en)
French (fr)
Inventor
Jean-Pierre Lenfant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELMETHERM
Original Assignee
ELMETHERM
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ELMETHERM filed Critical ELMETHERM
Publication of EP0485288A1 publication Critical patent/EP0485288A1/de
Withdrawn legal-status Critical Current

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    • 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
    • B65D88/66—Large containers characterised by means facilitating filling or emptying preventing bridge formation using vibrating or knocking devices

Definitions

  • the present invention relates to a device for storing and distributing pulverulent products.
  • powdery products are stored in silos fitted with a valve at the bottom so as to control the flow of the product thus stored.
  • pulverulent products used in combination with other products to form mixtures must generally be dosed by weighing so that there is provided a distributor, in series with the silo, which ensures the transfer of the pulverulent product from the silo to means weighing.
  • the distributor includes an Archimedes screw or a conveyor belt or simply a vibrating tube.
  • the vibrating tube is generally the solution chosen because, while ensuring the transfer, it avoids the problem of agglomerates by ensuring excellent distribution and high distribution precision.
  • the distributor As for the distributor, it is put at high speed as long as the load on the scale is far from the desired weight, but as soon as the weighed quantity approaches, the operator reduces the amplitude or frequency of the vibrations so as to reduce the and adjust the weighing. Once the desired weight is reached, the vibrating tube is stopped which immediately stops any flow.
  • This silo-distributor-balance unit is of a high price because the silo closing valve has a large closing power.
  • the distributor it significantly increases the cost of the chain because it is a mechanical machine which has a clean support structure and shock absorbers.
  • the vibration system must be powerful enough for the product to be transported.
  • Powdered products also pose another problem which, for reasons of simplification, will be called the preservation problem.
  • the object of the invention is to propose a device for the storage and distribution of powdery products which has a precision such that weighing can be carried out at the outlet of the silo, which eliminates the independent distribution means proper, which eliminates the presence a high-power shut-off valve, which allows access to the pulverulent product stored inside the silo without emptying it, which has a low cost price, which has reliability increased by the decrease mechanical parts involved, which consumes very little energy, which allows drying or conservation at constant humidity of the stored products, and which is compact.
  • the device for storing and distributing a pulverulent product having an angle given slope comprises a fixed storage silo secured to a support structure and provided with a flange at its lower part and is characterized in that it comprises distribution means comprising a vertical succession of concentric rings fixed to bracing bars, themselves suspended from the wall of the silo by vibration dampers, a shutter mounted at the bottom of the succession of rings and a vibrator whose vibrating body is integral with the rings of so as to cause the product to flow outside the rings of the distribution means.
  • the distribution means comprise a distribution cap of shape complementary to that of the rings, suspended from the silo by clamping means between two open or closed positions.
  • the cover is suspended from the silo by vibration damping means, the spacers supporting the rings are suspended from the silo by vibration damping means and the vibrator is integral with the spacers and rings.
  • a cone integral with the lower ring which closes off the entire central passage, the top being oriented upwards. as for sealing, it is obtained by an inflatable seal placed under the lower ring which retracts in the deflated position under the ring, and which is pressed between this lower ring and the wall of the cap when it is inflated.
  • the shutter provided at the lower part of the distribution means is a disc suspended from the bracing bars, the outside diameter of which is slightly greater than the diameter of the ring, less than and greater than the smallest diameter of the cap.
  • the cover comprises at its upper part a flange substantially identical to the flange of the silo, this cover flange receiving part of the clamping means and the flange of the silo receiving the other part .
  • These clamping means consist of cylinders regularly distributed around the periphery of the flanges.
  • the jacks consist of rubber casings, the upper part of which is fixed to the silo flange and the lower part of which is fixed to the cover flange, the pressure variations in the rubber casings allowing tightening and loosening of the cover relative to the silo.
  • the cap comprises at its lower part a projecting crown facing inwardly intended to cooperate with the shutter during movement of the cap relative to the distribution means.
  • the cover flange comprises means for decoupling the clamping means.
  • the vibrator it is of the pneumatic type and controlled by an on-off contactor with a variator so as to modify the flow rate of the product dispensed.
  • the silo comprises means for aerating the pulverulent product, a plunging cane the upper end of which is provided with a suction by ventilation arranged above the silo, the plunging cane being coaxial with the silo and provided with a suction head, the length of the cane being such that the head is coaxial with the rings of the distribution means and at their level.
  • the cover comprises at its lower part, in line with the opening and immediately below the sealing means, a set of electrical resistances intended to ensure the heating of the air sucked in by the fan. through the product, the head and the suction rod.
  • FIG. 1 shows a storage and distribution silo 100 according to the invention, supported by a frame 102 bearing on the ground, distribution means 104 and clamping means 106. At the upper part of the silo, there are provided access means (not shown) allowing, in a known manner, the filling of this silo.
  • FIG 2 there is shown the silo 100 and its outer casing 108 provided at its lower part with a flange 110.
  • the inner part of the silo comprises rings 112 removing the voltage as will be explained later. These rings are regularly distributed throughout the height of the silo and fixed on bracing bars 114, themselves bearing on an inner flange 116. Vibration dampers 118, of the silentbloc type, are interposed between these bracing bars 114 and the wall 108 of the silo.
  • the silo support frame 102 has been omitted for clarity of the drawing.
  • the distribution means 104 are also shown in section which comprise a distribution cap 120 in the shape of an inverted cone, the lower end 122 being the narrowest while the upper part 124 has a flange 126 of the same dimensions. than those of the flange 110 of the silo 100 and arranged opposite.
  • This flange 126 includes bores 128 as also shown in detail in Figure 3, through which passes the rod 130 of a cylinder 132 of the clamping means 106, the cylinder 132 having the body 134 secured to the outside from the wall 108 of the silo 100 by a tab 136.
  • the end of the rod 130 of the jack comprises means 138 for blocking this rod with respect to the cover flange 126 so that the latter can be mounted on the jack rod 130 and then locked in the vertical direction. But these blocking means must also allow the reverse operation.
  • An external peripheral bellows 140 is provided which ensures the connection of the silo flange 110 with the cover flange 126 so as to impart a certain seal to the device.
  • the distribution means 104 also comprise a vertical succession of rings 142 fixed to spacer bars 144 themselves suspended from the wall of the silo 108 by vibration dampers 147.
  • the spacing of the rings is referenced h , the diameters are decreasing from top to bottom, and the generators of these rings, assimilable at the bracing bars 144 make an angle ⁇ with the vertical.
  • This formula is also applicable in the case of the calculation of the spacing of the rings of the silo since tg ⁇ is then equal to zero.
  • FIGS. 2 and 3 a vibrator 146 has also been shown, the vibrating body 148 of which is integral with the spacer bars 144, the housing of the vibrator 146 being integral with the flange 110 of the silo 100.
  • the distribution means also include a shutter 150, fixed on the bracing bars 144 immediately below the last ring 152.
  • This shutter 150 has a diameter substantially equal to that of the last ring 152 so as to close the passage. through this latter ring 152, and the cap 120 is also provided with a crown 154 oriented inwards and the projecting part of which is such that the inside diameter of this crown is greater than the diameter of the shutter.
  • FIG. 6 there is shown an alternative embodiment with a jack 160 with inflatable envelopes, this jack comprising several chambers 162, 164, 166 and a supply 168 in pressure-depression.
  • a jack 160 with inflatable envelopes this jack comprising several chambers 162, 164, 166 and a supply 168 in pressure-depression.
  • Such an actuator comprises an upper plate 170 and a lower plate 172 making it possible to connect the flexible envelopes to the flanges 126 and 110 respectively of the distribution means and of the silo.
  • Such a jack capable of replacing the jack 132 of known type, hydraulic or pneumatic has the advantage of tightening and loosening while suppressing any vibration between the cover 120 and the silo 100.
  • bracing bars 144 and the rings 142 are permanently fixed to the silo 100 and remain suspended therefrom.
  • the cap 120 is placed around these rings and these bracing bars until the flange 126 comes in line with the flange 110 so that the cylinder rod 130 and the blocking means 138 pass through the bores 128 of the flange 126 of the cap 120.
  • the cap 120 is then suspended from the rod 130 of the jack 132. In this position, the shutter 150 fixed to the bracing bars is not in contact with the projecting crown 154.
  • the bellows 140 is arranged around the flanges 110 and 126 to ensure sealing at the level of the flange.
  • the cylinders 132 are actuated so that the body 134 of these cylinders, placed under vacuum, pulls the rod 130 and thereby raises the cap 120 by bringing the flange 126 closer to the flange 110.
  • the tightening is interrupted when the crown 154 cooperates with the shutter 150 while closing the passage.
  • the powdery product which must be stored and distributed is introduced into the casing 118 of the silo 100 at the top. This product falls by gravity to the bottom of the rings 142 of the distribution means 104 accumulating on the shutter 150, as and when filling.
  • the product does not flow outside the rings 142 taking into account the angle ⁇ of the slope and taking into account the fact that the width and the pitch of the rings are calculated so that the product cannot flow from it -even.
  • the entire silo is filled over its entire height.
  • the product then rests on all of the rings without bearing on the periphery, which eliminates all the problems of arching and all the problems of flow.
  • the user When the user wishes to evacuate a certain quantity of product from the silo in order to carry out a weighing by means of a scale (not shown) which would be arranged in line with the narrowed portion 122 of the cap 120, he lowers the cap by actuation reverse of the clamping means to open the passage, it activates the vibrator 146 by means of a control (not shown) comprising an on-off button, and possibly a variator so as to increase or decrease the amplitude or the frequency of the vibrations .
  • the activation of the vibrator causes the rings to vibrate and therefore the migration of the product on the rings and the flow of the product on the outside of the rings, in the part between the rings and the wall of the cap.
  • the variations in amplitude and frequency of vibrations make it possible to vary the flow rate at the lower part 122 of the cap 120.
  • the product flows between the crown 154 and the shutter and leaves outside the distribution means 104 Generally the amplitude and frequency of the vibrations are important at the start of weighing and then reduced to refine the weighing when the prefixed value of the weighing is close.
  • the distribution takes place by vibrating the rings which causes the migration of the product on the surface of the rings, that is to say that the product is mechanically driven by the rings thanks to the coefficient of friction of the product with respect to the rings without that this changes the slope angle of the product which is predetermined and invariable. Also the cessation of vibrations causes the immediate cessation of flow and distribution.
  • This variant is very interesting because it allows direct viewing of the stored product, elimination of foreign bodies possibly introduced into the silo, in-situ tests or measurements of in-situ physico-chemical parameters or simply samples. in different places without the silo being emptied.
  • Another advantage of the invention lies in the fact that the product is distributed in the form of a "rain” and not in the form of agglomerates as was the case in the storage devices and silos of the prior art.
  • the shutter (150) can also be removable, which allows complete emptying of the silo.
  • This device also has an important advantage in that the fitting of the cap 120 does not cause any compression of the product since the only compression that the product supports is that of its own weight bearing on the rings. Similarly, the vaulting problems are completely eliminated since the product does not come to bear on the wall but simply rests, thanks to its slope angle, on the rings of diameter, width and given steps.
  • Figure 7 which shows a sectional view identical to that of Figure 2, there is shown schematically the suction, ventilation and drying means according to the invention.
  • a rod 200 is provided, which penetrates inside the silo 100 and which extends beyond it to the upper part of the cap 120 substantially in line with the flange 126.
  • This cane 200 is provided at its lower end 220 with a head 222 comprising an outer wall 224 and a second inner wall 228, provided with suction nozzles 226 preventing the aspiration of the pulverulent product through the cane 200.
  • a baffle arrangement is well known to those skilled in the art and is shown here only schematically.
  • This head 222 extends parallel to the virtual wall defined by the rings at a constant distance from the latter so that there is between the rings and this head 222 a substantially constant thickness of product, this thickness being variable as a function of the grain size, of the type of product. This head extends up to near the shutter 150.
  • the rod 200 and the head 222 are completed by suction means 230, arranged above the silo 100 and comprising a simple fan 232 whose flow rate and vacuum are adjustable.
  • Heating means 234 are also provided in line with the lower end 122 of the cover 120 in the form of resistances secured to the cover 120.
  • the suction means 230 are switched on so that the fan 232 sucks in the following air the arrow 236 inside the cane 200 to evacuate it towards the outside of the silo, the cane 200 ensuring the connection between the head 222 and the suction means 230.
  • the pulverulent product does not penetrate inside the head 222 and the product which could have accidentally penetrated falls by gravity to the lower part of the head, which prevents any clogging.
  • the air is sucked in through the lower part 122 of the cap 120 in the direction of the arrow 238 through the thickness of product between the rings and the head 222.
  • the storage and distribution device can allow ventilation of a given product but also its drying with the important advantage of drying only the product contained in the cap, that is to say at when to distribute, not to dry the entire product.
  • it allows suction to be provided throughout the silo so as to ensure ventilation of the entire product.
  • Such a storage and distribution device is therefore modular and makes it possible to perform numerous functions using a single device, whether or not provided with accessories.
  • the drying is also carried out against the current which improves the yield and it is permissible to envisage numerous embodiments of this variant which would make it possible to improve the yield, the uniformity of drying or to control the degree of drying.
  • FIG. 8 there is provided a silo 300, a cover 302, rings 304, a vibrator 306 and shutter means 308.
  • the cover is removably attached to the silo and it includes connections 310 with vibration dampers 3121.
  • the succession of rings 304 is also fixed to the silo 300 by vibration damping means 314, in particular by cables or tie rods mounted on silent blocks.
  • sealing means 308 they comprise on the one hand a cone 316 whose apex 318 is oriented upwards, the periphery 320 of its base being connected to the lower ring so that the central passage is closed.
  • These sealing means 308 further comprise an inflatable seal 322 disposed in a housing 324 secured to the lower ring.
  • the dimensions of the housing and of the seal are such that when the seal 322 is deflated, the product can flow outside the rings under the effect of the vibrations generated by the vibrator while when the seal is inflated, the passage between the inner wall of the cap and the rings are closed, thus preventing any flow even if the vibrator continues to operate.
  • This embodiment also makes it possible to vibrate the cover independently by an external vibrator in order to clean the interior walls of the cover when the pulverulent product is very fine and has a high coefficient of adhesion.
  • the rings are serrated on their inner periphery so as to break up any agglomerate of product which may form in the upper part of the silo.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
EP91402976A 1990-11-07 1991-11-06 Einrichtung zum Speichern und Austragen von pulverförmigen Produkten Withdrawn EP0485288A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9013812A FR2668759B1 (fr) 1990-11-07 1990-11-07 Dispositif de stockage et de distribution de produits pulverulents.
FR9013812 1990-11-07

Publications (1)

Publication Number Publication Date
EP0485288A1 true EP0485288A1 (de) 1992-05-13

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EP91402976A Withdrawn EP0485288A1 (de) 1990-11-07 1991-11-06 Einrichtung zum Speichern und Austragen von pulverförmigen Produkten

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EP (1) EP0485288A1 (de)
FR (1) FR2668759B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108266037A (zh) * 2018-03-26 2018-07-10 郑州航空工业管理学院 一种减震隔震筒仓

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115352767A (zh) * 2022-08-11 2022-11-18 湖北新华光信息材料有限公司 一种易潮解原料的存储装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1046474A (fr) * 1951-12-17 1953-12-07 Perfectionnements aux trémies
CH540173A (de) * 1972-05-18 1973-08-15 Fischer Ag Georg Bunker für fliessfähiges Schüttgut
DE2500566B1 (de) * 1975-01-09 1976-04-15 Hosokawa Micron Kk Aufgabevorrichtung fuer pulvriges Material
GB2084117A (en) * 1980-09-19 1982-04-07 British Steam Specialties The Storage container discharge aid
DE8020859U1 (de) * 1980-08-04 1982-05-06 Schäffer, Erich, Ing.(grad.), 8851 Thierhaupten Austragvorrichtung für Schüttgutsilos

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1046474A (fr) * 1951-12-17 1953-12-07 Perfectionnements aux trémies
CH540173A (de) * 1972-05-18 1973-08-15 Fischer Ag Georg Bunker für fliessfähiges Schüttgut
DE2500566B1 (de) * 1975-01-09 1976-04-15 Hosokawa Micron Kk Aufgabevorrichtung fuer pulvriges Material
DE8020859U1 (de) * 1980-08-04 1982-05-06 Schäffer, Erich, Ing.(grad.), 8851 Thierhaupten Austragvorrichtung für Schüttgutsilos
GB2084117A (en) * 1980-09-19 1982-04-07 British Steam Specialties The Storage container discharge aid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108266037A (zh) * 2018-03-26 2018-07-10 郑州航空工业管理学院 一种减震隔震筒仓
CN108266037B (zh) * 2018-03-26 2023-05-09 郑州航空工业管理学院 一种减震隔震筒仓

Also Published As

Publication number Publication date
FR2668759B1 (fr) 1993-01-22
FR2668759A1 (fr) 1992-05-07

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