EP0073833A1 - Systeme pneumatique permettant d'assurer l'aspiration d'air des compartiments de silo - Google Patents

Systeme pneumatique permettant d'assurer l'aspiration d'air des compartiments de silo

Info

Publication number
EP0073833A1
EP0073833A1 EP82901418A EP82901418A EP0073833A1 EP 0073833 A1 EP0073833 A1 EP 0073833A1 EP 82901418 A EP82901418 A EP 82901418A EP 82901418 A EP82901418 A EP 82901418A EP 0073833 A1 EP0073833 A1 EP 0073833A1
Authority
EP
European Patent Office
Prior art keywords
aspiration
flap
silo
pneumatic
air
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Withdrawn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
EP82901418A
Other languages
German (de)
English (en)
Inventor
Hans Oetiker
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.)
Buehler AG
Original Assignee
Buehler AG
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 Buehler AG filed Critical Buehler AG
Publication of EP0073833A1 publication Critical patent/EP0073833A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/24—Gas suction systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/28—Systems utilising a combination of gas pressure and suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material

Definitions

  • the invention relates to a method for securing the air extraction from silo cells with mill products or other pourable foodstuffs or animal feed, with pneumatic product feed, and to an aspiration flap for silo cells which are particularly suitable for carrying out such a method is.
  • the aspiration should ensure the air intake from the interior of the silo as economically as possible, with the aim being to prevent a fire in one silo cell from being spread from there to another.
  • a position signal is emitted to an aspiration flap based on the position of the pipe switch.
  • this object is achieved in that a (preferably mechanical-pneumatic) control signal is derived from the air flow of the pneumatic conveying air and is used to control the air suction via servo means.
  • the solution according to the invention is surprisingly simple, explosion-proof (insofar as the elements directly required for it are concerned) and can be used autonomously even when using a large number of corresponding aspiration flaps; it also brings about a noticeable increase in operational safety. It is essential that a signal is derived from the flow of the conveying air: " " ⁇ fc. "” this is increasingly used to control the air extraction via servo means.
  • the air extraction can be controlled as desired even at the start of the air flow.
  • the aspiration flaps can already be fully opened even when idling, which, in contrast to the prior art from DE-C-1 150 622, already gives full functionality even when idling.
  • control signal can advantageously be derived from the conveying air flow by means of a sensor plate and into a corresponding pneumatic one
  • Control signal for controlling the air extraction can be implemented. Both the opening and the closing of the air extraction are preferably carried out using small, but previously defined (adjustable) servo forces.
  • the invention enables a valuable additional contribution to the safety of silo systems due to a completely unexpected, new mode of operation.
  • the control means for the air extraction are also designed to act as safety elements (safety valves) which open and close again automatically in the event of pressure deviations in both directions: if an unforeseen reduction in pressure occurs in the silo cell concerned, both Development of an undesirable negative pressure, as well as an undesirable excess pressure in the cell, the corresponding pressure equalization can be easily established via the aspiration.
  • the invention leads to the fact that at least some of the dust sources are removed, in that the control means in the air suction are simultaneously effective in that both negative pressure and positive pressure in the cell can be reduced via the aspiration.
  • suitable constructive training e.g. in the manner of a "swing door” that can be opened on both sides, the way between the inside of the silo and the aspiration can be cleared easily and quickly.
  • the way for the dusty air is in this way both during the operation of the pneumatic conveyor tion, as well as during the breaks in operation, namely directly from the cell into the aspiration and into a filter system, where the air is freed of dust.
  • the new invention brings a considerable advantage increased economy.
  • the method according to the invention can preferably be used with a group of silo cells, at least for larger pneumatic conveying capacities, the silo being fed via pipe switches from a pneumatic conveying system optionally to a silo cell from a group of silo cells and each of the silo cells in question via controllable aspiration flaps with a common one Aspiration is connectable:
  • the (pre- preferably pneumatic) control signal via servo means or via the aspiration flap to connect or interrupt the connection of the silo cell with the aspiration, the entire control system for air extraction of each silo cell working autonomously.
  • the connection between all silo cells and the aspiration is interrupted as soon as the pneumatic system is out of operation.
  • the aspiration flaps are simultaneously active as a safety system, safety is also provided for the aspiration and the ventilator. Regardless of the operating state, fires, glowing parts etc. can be prevented from being transmitted from cell to cell via the aspiration.
  • the invention further relates to an aspiration flap which is particularly suitable for carrying out a method according to the invention, preferably assigned to each silo cell from a group of silo cells and connected to a common aspiration and depending on either via pipe switches or the ⁇ same switchable feed pneumatics is controllable.
  • the aspiration flap can be controlled via servo means and at the same time is designed as a pressure safety flap for the associated silo cell. So far, the structural design of the aspiration flaps has been particularly unsatisfactory, be it that mechanical faults continuously occurred or that an overly complex control system became necessary.
  • the aspiration flap according to the invention thus becomes a central element of the entire air system of a silo system.
  • a particularly functionally reliable embodiment of the device according to the invention is obtained if a sensing plate associated with the supply pneumatics is provided for sensing the conveying air and for generating a corresponding control signal for the servo means.
  • the sensing plate is expediently designed to be pivotable via a swivel arm and assigned to a pipe end leading into the silo cell of the supply pneumatics, so that the opening of the pipe end is released or closed by the swiveling movement and the sensing plate is thereby released by a low restoring force, e.g. by a spring, is pressed into the closed position.
  • the pneumatic servo means advantageously have a pneumatic valve which can be actuated by the swivel arm of the sensing plate.
  • a very simple construction is obtained if the pneumatic servo means have a logic element, preferably a negation element, and a double-acting pneumatic cylinder, so that the aspiration flap which can be actuated by the pneumatic cylinder can be moved with compressed air in both directions.
  • the switching point of the pneumatic valve is preferably set to only a small path of the swivel arm, which is of the order of mm, in order to trigger the full opening of the aspiration flap even with only a small air flow in the pneumatic delivery line.
  • the closing pressure for the aspiration flap can also be preselected to a certain value such that when a corresponding overpressure in the interior of the silo or a corresponding force on the aspiration flap is exceeded, the latter opens automatically. It has also proven to be very expedient if the aspiration flap is assigned a pressure safety plate that opens against its own weight. With regard to simple manufacture and assembly, it is very expedient if all elements of the aspiration flap, the control and the pressure safety flap are combined as a construction ji-ippe on a common support plate. It is also advantageous if the assembly is combined with a cell entry cover.
  • the pressure safety flap can advantageously also be controlled via signals other than those described. l, for example via a limit switch in the area of a pipe switch or via an elevator which automatically emits the signal for opening the aspiration flap when it is started up.
  • This can be particularly important for existing systems, since elevators require very little energy, but produce a lot of dust-laden air and are relatively often the source of interference for fires.
  • the solution according to the invention therefore proves to be particularly useful here, as it generally prevents a fire from spreading into other cells.
  • Several aspiration flaps according to the invention can also be easily attached to a silo cell into which several pneumatics open.
  • FIG. 1 shows a section through an aspiration device according to the invention
  • Figure 2 shows the circuit diagram for the device of Figure 1
  • Figure 3 is a schematic representation of a silo with pneumatic Prou.u _-. T conveying and air extraction according to the invention.
  • the product from 0 manufacturing containers 1 is fed into silo cells 8, 9, 10 and 11 via locks 2, a pneumatic conveying line 3 and also via pipe switches 4, 5, 6 and 7. These silo cells are then transformed into a suitable conveyor,
  • Each silo cell has an aspiration flap, which is connected as a unit 13, 14, 15 or 16 directly to a common aspiration or aspiration line 17, which in turn cleans the central filter system 19 via a fan 18 * Releases air back into the open.
  • FIG. 1 and FIG. 2 The details of the assemblies 13, 14, 15 and 16 and the aspiration flaps are shown in FIG. 1 and the pneumatic circuit diagram used for this is shown in FIG. 2:
  • FIG. 1 and FIG. 2 only the end of the delivery line 20 is shown, that directly into the interior of the respective silo cell 8, 9, 10 or 11 ( Figure 1, Figure 3) opens.
  • This delivery line end 20 is closed in the position shown in FIGS. 1 and 2 by a sensor plate 21, so that no product delivery can take place.
  • the sensing plate 21 is fixedly attached to a swivel arm 22 with bolts 23 (FIG. 1).
  • the swivel arm 22, which works with the sensing plate 21 in the dust air, is guided by a rubber membrane 24 (FIG.
  • the movement of the sensing plate 21 is controlled by the air flow of the conveying air. Even if the sensing plate 21 supports the function of the pipe switches 4, 5, 6 and 7, since the unused delivery line end 20 is additionally closed by means of the sensing plate 21, the central importance of the device lies in the fact that the air flow is pneumatic Signal is derived, which controls the air extraction via servo means.
  • the mechanical-pneumatic control signal is generated by the sensor plate 21, the swivel arm 22, a switch contact 32 and a pneumatic valve 33 and controls a pneumatic cylinder 35 together with a negation element 34.
  • the switch contact 32 is in the closed position of the sensor plate 21 in the pressed-in position and gives compressed air via a pressure line 36 and 37 to a control connection 38 of the negation element 34 and to the lower side of the pneumatic cylinder 35 . * so that the piston rod 39 of the pneumatic cylinder 35 remains in the raised position.
  • a second connecting line 40 leads from the compressed air line 37 to a second control connection 40 'of the negation element 34.
  • the pneumatic valve 33 is set in such a way that the valve 33 is switched over a short distance (in the order of magnitude of mm).
  • the setting is normally carried out in such a way that the pressure in the control line 38 is interrupted at a gap "A" (point 1) of a few mm, so that the pressure drops both at the negation element 34 and at the lower pressure connection 38 '.
  • the negation element 34 is switched over simultaneously.
  • the desired displacement pressure is immediately set at the pressure connection and the piston rod 39 moves together with an aspirator. tion flap 42 down (arrow B- Figure 1) in the open position. In this way, with a minimal air movement in the delivery line end 20, an arbitrarily large or adjustable force is delivered to the aspiration flap via the pneumatic cylinder * 35.
  • the aspiration flap 42 can be pulled down and opened even when the sensor flap 21 is closed, if, for example large quantities of product collapse inside the silo.
  • the aspiration flap 42 (FIG. 1) consists of a support ring 43, a rubber seal 44 and a fastening ring 45, which together form the main body of the aspiration flap 42. These four individual parts (piston rod 39, support ring 43, rubber seal 44 and fastening ring 45) are screwed together rigidly.
  • the overpressure safety device 46 is freely displaceable relative to the piston rod 39 and rests on the rubber seal 44.
  • the support ring 43 is connected to the piston rod by four spokes 47, so that essentially the entire inner annular surface of the support ring 43 or the rubber seal 44 is closed only by the overpressure protection.
  • the overpressure protection device 46 which rests on the rubber seal 44 only by its own weight, is lifted off and thus the Released from the interior of the silo through the aspiration line 17.
  • the pneumatic control signal can also be taken off directly by corresponding switch contacts on the elec- tor.
  • the aspiration flap then maintains at least a partially autonomous function. It is advantageous if the conversion of the electrical signal into a pneumatic signal is carried out at a point that lies outside each danger zone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Abstract

Le procede permet d'assurer l'aspiration de l'air des compartiments de silo (8, 9, 10, 11) remplis de produits pulverises, dans lesquels l'alimentation des produits a lieu de maniere pneumatique. On obtient de l'air de refoulement, un signal, de preference un signal mecanique pneumatique, qui commande l'aspiration de l'air par des servocommandes (33, 34, 35), Un volet d'aspiration (42) est relie a une source de depression commune et est commande par un dispositif pneumatique (3) d'adduction d'air pouvant etre enclenche par un aiguillage tubulaire (4-7) ou analogue. Ce volet d'aspiration (42) est asservi a des servocommandes (33, 35) et peut en meme temps fonctionner comme volet de surete a la pression (43-47) pour le compartiment de silo (8 9; 10; 11) concerne.
EP82901418A 1981-05-13 1982-05-12 Systeme pneumatique permettant d'assurer l'aspiration d'air des compartiments de silo Withdrawn EP0073833A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3118993 1981-05-13
DE3118993A DE3118993C2 (de) 1981-05-13 1981-05-13 Verfahren und Vorrichtung zur Sicherung der Luftabsaugung aus Silozellen

Publications (1)

Publication Number Publication Date
EP0073833A1 true EP0073833A1 (fr) 1983-03-16

Family

ID=6132195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82901418A Withdrawn EP0073833A1 (fr) 1981-05-13 1982-05-12 Systeme pneumatique permettant d'assurer l'aspiration d'air des compartiments de silo

Country Status (6)

Country Link
EP (1) EP0073833A1 (fr)
JP (1) JPS58500710A (fr)
DE (1) DE3118993C2 (fr)
IT (1) IT1155344B (fr)
SU (1) SU1149867A3 (fr)
WO (1) WO1982004033A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPI20030034A1 (it) * 2003-05-23 2004-11-24 Italprogetti Engineering Srl Metodo e apparato per il trasporto pneumatico di pellami
JP6074204B2 (ja) * 2012-09-26 2017-02-01 住友電設株式会社 地中埋設管の充填工法
CN105947681A (zh) * 2016-06-12 2016-09-21 天津市实达电力设备有限公司 一种正压气力粉粒物料输送泵

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1150622B (de) * 1959-08-27 1963-06-20 Miag Muehlenbau Einrichtung zum Abfuehren der Foerderluft aus Silozellen
US4473326A (en) * 1980-03-19 1984-09-25 Gebruder Buhler A.G. Method of controlling delivery conditions in a pneumatic conveyor line, and mill pneumatics for implementing this method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8204033A1 *

Also Published As

Publication number Publication date
SU1149867A3 (ru) 1985-04-07
IT8267619A0 (it) 1982-05-11
IT1155344B (it) 1987-01-28
WO1982004033A1 (fr) 1982-11-25
DE3118993A1 (de) 1982-12-02
JPS58500710A (ja) 1983-05-06
DE3118993C2 (de) 1986-06-19

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19821125

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Inventor name: OETIKER, HANS