EP0048362A2 - Dispositif de protection pour tiges de piston de vérins, en particulier dans des appareils de combustion - Google Patents

Dispositif de protection pour tiges de piston de vérins, en particulier dans des appareils de combustion Download PDF

Info

Publication number
EP0048362A2
EP0048362A2 EP81106898A EP81106898A EP0048362A2 EP 0048362 A2 EP0048362 A2 EP 0048362A2 EP 81106898 A EP81106898 A EP 81106898A EP 81106898 A EP81106898 A EP 81106898A EP 0048362 A2 EP0048362 A2 EP 0048362A2
Authority
EP
European Patent Office
Prior art keywords
protective tube
working cylinder
protection device
piston rod
piston
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Withdrawn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
EP81106898A
Other languages
German (de)
English (en)
Other versions
EP0048362A3 (fr
Inventor
Johannes Josef Dr.-Ing. Martin
Walter Josef Dipl.-Ing. Martin
Erich Weber
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.)
Josef Martin Feuerungsbau GmbH
Original Assignee
Josef Martin Feuerungsbau GmbH
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 Josef Martin Feuerungsbau GmbH filed Critical Josef Martin Feuerungsbau GmbH
Publication of EP0048362A2 publication Critical patent/EP0048362A2/fr
Publication of EP0048362A3 publication Critical patent/EP0048362A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F23K3/16—Over-feed arrangements

Definitions

  • the invention relates to a protective device for piston rods of working cylinders, in particular for firing systems, in which a protective tube is attached sealingly to the piston rod with one end, the length of which exceeds the stroke length of the piston rod and which engages with its opposite open end over the working cylinder.
  • a delivery piston for fuels which falls from a feed hopper into a delivery line or can be pressed into it by a further piston when the delivery piston is in its retracted position behind the passage opening between the delivery hopper and delivery line located.
  • the feed piston is provided with a shaving head at its front end and has a very long piston skirt in order to provide good guidance for the tilting forces which occur when larger pieces of waste are sheared off.
  • the piston shirt is made so long that in the retracted position it engages over a hydraulic working cylinder, the piston rod of which is on the floor the delivery piston is attached. This large length of the delivery piston prevents fuel from falling out of the feed funnel behind the piston when the latter is in its foremost working position.
  • the delivery pipe is arranged at an incline to the furnace and is filled with water in its rear part, in which the feed funnel opens.
  • the delivery plunger has a longitudinally extending groove on its top side, via which the water carried along can flow back again. This has the consequence that the water can also penetrate into the extension of the delivery pipe, in which the hydraulic working cylinder is located.
  • This delivery piston therefore does not provide protection for the piston rod, since the water mixed with fuel parts can get into the space behind the piston and thus lead to corrosion of the piston rod. This is all the more so since the delivery piston surrounds the working cylinder and its piston rod at a relatively large distance, so that the water behind the piston, which is increasingly enriched with fuel parts, can easily reach the piston rod.
  • the piston rod If the piston rod is not retracted into the working cylinder for a longer period of time, the oil film adhering to it can become encrusted in connection with dust deposits and high temperatures, so that these incrustations, if the piston rod is then retracted, can destroy the piston rod seal.
  • a preferred area of application for working cylinders of this type is the loading device of a furnace, the loading pistons of which perform working strokes that are shorter than the entire extension length of the piston rod of the furnace actuating working cylinder.
  • the above-described destruction of the piston rod seal always occurs when the piston rod is completely retracted into the working cylinder on weekends or after an even longer emptying stroke of the loading piston.
  • the case may also arise that a fire arises behind the charging pistons behind which the piston rods lie due to leaked liquid materials with high calorific value or leakage oil. Depending on the intensity and duration, such a fire can destroy the piston rod and even the entire working cylinder.
  • the object of the invention is to provide a protective device with the aid of which harmful effects on the piston rod and thus also harmful effects on the piston rod seal of the working cylinder are prevented.
  • this object is achieved according to the invention in that the protective tube surrounds the working cylinder with a small gap.
  • the protective tube which is not comparable in terms of its length and the sealed arrangement on the piston rod of the working cylinder with delivery pistons of the known conveying devices explained above, surrounds the working cylinder with a very narrow gap, the piston rod is protected against external influences, for. B. mechanical effects, protected. For example, it is no longer possible for the piston rod to become hotter from the action of sparks Ash or the like is subject.
  • the rear end of the protective tube which is open through a narrow gap, is in most applications in a room in which aggressive gases are not present.
  • the gap between the working cylinder and the protective tube is designed in the manner of an annular nozzle, then due to the movements of the piston rod with which the protective tube is inevitably carried, a pumping action is exerted in relation to the volume enclosed by the protective tube , which causes an air circulation inside the protective tube, which on the one hand prevents the deposition of dust particles contained in the air, and on the other hand causes cooling of the piston rod, since the air is brought in from a space which is a greater distance from the front end of the piston rod has and is therefore no longer subject to a high temperature effect, as can be the case with the front end of the piston rod.
  • a purge air line can open into the interior of the protective tube.
  • purge air is not to be considered so narrowly, but any gas can be used if no protective effect is achieved by air because the environment is too aggressive, so that the use of inert gases, for example, may be necessary.
  • purge air is therefore to be understood as any gas that can be introduced into the protective tube to protect the piston rod.
  • the protective tube is designed with a rectangular cross-section and the working cylinder with a round cross-section
  • a partition with a passage opening is provided in a further development of the invention for sealing the rear end of the protective tube inside the same in the region of the rear open end, the contour of which the outer contour of the working cylinder and those parts with a narrow gap which are provided on the outside of the working cylinder are adapted.
  • Such parts can be feed pipes for the work equipment, for example. It is thus possible in a simple manner to create a narrow gap between the working cylinder by means of a corresponding cutout in the dividing wall with a simple cross section of the protective tube even if the latter is provided with additional parts or tubes on its outside.
  • the effect of the narrow gap which is to keep aggressive gases or dust particles away from the interior of the protective tube in order to deposit the Preventing dust or condensate from the gases on the piston rod is particularly important when the rear end is exposed to such a harmful atmosphere. If, on the other hand, there is the possibility of arranging the working cylinder behind a protective or dividing wall, it is advisable according to a further development of the invention to pass the protective tube through this protective or dividing wall with a narrow gap or in a sealed manner.
  • the protective tube can be supported and guided by support and guide rollers in a further embodiment of the invention.
  • support and guide rollers can be arranged one behind the other.
  • the protective tube with its upper edge is either flush with the upper edge of the charging piston or directly below it. This allows the piston rod to be extended a long way without impairing the function of a scraper arranged on the charging piston, which could be the case if the protective tube were higher than the charging piston, since otherwise deposits could accumulate between the protective tube and the scraper.
  • 1 shows a loading device for a furnace, in which 1 denotes a feed chute, 2 a feed table and 3 a loading piston. 1 therefore shows a possible area of application for the invention
  • a working cylinder 4 is used to actuate the feed piston 3, the piston rod 5 of which is connected to the feed piston 3 via a joint 6.
  • the feed chute 1 extends close to the top of the feed piston 3, on which a scraper 7 rests, in order to prevent the material to be fed from being pulled along by the gap 8 remaining between the feed chute 1 and the feed piston 3.
  • the length of the protective tube 9 is dimensioned such that it engages over the working cylinder 4 even when the piston rod 5 is fully extended.
  • a narrow annular gap 10 is left, which is designed in the manner of an annular nozzle and through which air is sucked in and pushed out again during the reciprocating movement of the piston rod into the space surrounded by the protective tube 9, whereby this gap 10 is so narrow that the resulting pumping action is sufficient to cause a noticeable inflow speed of the sucked-in air into the space delimited by the protective tube 9 given the speed of movement of the piston.
  • circulation and flushing of this space is achieved, as a result of which the piston rod is cooled and possibly penetrating dust particles are flushed out, so that no deposits of possibly dusty air can settle on the piston rod.
  • a purge air line 12 is introduced into the space 11 through the gap 10, from the nozzle-shaped mouth 13 of which air is present Overpressure is introduced into room 11.
  • This purge air line cannot, for example, with one in the drawing Underwind line shown be connected, so that a sufficient air movement in the room 11 can be achieved at a relatively high underwind pressure.
  • the protective tube 9 is sealed through a rear partition 14, so that no false air can penetrate into the loading area and thus into the furnace. Since the protective tube protrudes backwards over the partition 14 even in the fully extended end position of the piston rod 5, no aggressive gases can penetrate into the gap 10 from the charging chamber during normal operation. This is only the case if, due to a temporary increase in pressure in the loading space, for example caused by an intensive deflagration in the combustion chamber, gases from the loading space can get behind the partition 14 through leaks.
  • support and guide rollers 15 are provided which prevent the protective tube 9 from skewing, which is only firmly connected to the piston rod 5 at its end facing the charging piston 3.
  • the protective tube 9 does not have to be provided with corresponding bulges, since it should be adapted to the contour of the working cylinder including the lines, is in the protective tube 9 with a rectangular cross section at the rear end of a partition 17 is provided which has a passage opening 18 for the working cylinder 4.
  • the contour of the passage opening 18 is the contour of the Adjusted working cylinder 4 and the contour of the lines 12 and 16 arranged on the working cylinder while maintaining a narrow gap 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Actuator (AREA)
  • Incineration Of Waste (AREA)
  • Furnace Charging Or Discharging (AREA)
EP81106898A 1980-09-24 1981-09-03 Dispositif de protection pour tiges de piston de vérins, en particulier dans des appareils de combustion Withdrawn EP0048362A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3036053 1980-09-24
DE19803036053 DE3036053A1 (de) 1980-09-24 1980-09-24 Schutzvorrichtung fuer kolbenstangen von arbeitszylindern, insbesondere fuer feuerungsanlagen

Publications (2)

Publication Number Publication Date
EP0048362A2 true EP0048362A2 (fr) 1982-03-31
EP0048362A3 EP0048362A3 (fr) 1982-09-01

Family

ID=6112762

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106898A Withdrawn EP0048362A3 (fr) 1980-09-24 1981-09-03 Dispositif de protection pour tiges de piston de vérins, en particulier dans des appareils de combustion

Country Status (7)

Country Link
EP (1) EP0048362A3 (fr)
JP (1) JPS57108587A (fr)
BR (1) BR8106084A (fr)
CA (1) CA1176915A (fr)
DD (1) DD200533A5 (fr)
DE (1) DE3036053A1 (fr)
DK (1) DK421181A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215787A (en) * 1988-02-10 1989-09-27 Festo Kg Protective device for exterior of a working member movable in a receiving member
EP0450156A1 (fr) * 1990-03-30 1991-10-09 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Dispositif de protection pour la tige d'un vérin hydraulique
WO2005028297A1 (fr) * 2003-09-24 2005-03-31 Jolly Drive S.R.L. Dispositif destine a proteger un element submerge, et notamment un ensemble piston-cylindre, contre la vegetation marine
US7594466B2 (en) 2007-01-12 2009-09-29 Rotobec Inc. Actuator with a protective sleeve for a piston
CN110410380A (zh) * 2019-08-27 2019-11-05 杭州先力液压机械有限公司 水冷加料属具及其工作方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102536955A (zh) * 2011-12-30 2012-07-04 东北农业大学 双缸体对置式非端部铰接支承液压油缸

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1551906A1 (de) * 1966-03-01 1970-01-15 Martin Joh Jos Dr Ing Beschickungseinrichtung fuer Grossfeuerungen,insbesondere Muellverbrennungsanlagen
DE1601715A1 (de) * 1968-03-09 1970-08-13 Rolf Dohrendorf Hydraulische Einrichtung,insbesondere zum Antrieb von Baumaschinen
US3559823A (en) * 1969-03-14 1971-02-02 Albert Ostrin Ram feed for incinerators

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1551906A1 (de) * 1966-03-01 1970-01-15 Martin Joh Jos Dr Ing Beschickungseinrichtung fuer Grossfeuerungen,insbesondere Muellverbrennungsanlagen
DE1601715A1 (de) * 1968-03-09 1970-08-13 Rolf Dohrendorf Hydraulische Einrichtung,insbesondere zum Antrieb von Baumaschinen
US3559823A (en) * 1969-03-14 1971-02-02 Albert Ostrin Ram feed for incinerators

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215787A (en) * 1988-02-10 1989-09-27 Festo Kg Protective device for exterior of a working member movable in a receiving member
GB2215787B (en) * 1988-02-10 1992-02-12 Festo Kg A protective device
EP0450156A1 (fr) * 1990-03-30 1991-10-09 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Dispositif de protection pour la tige d'un vérin hydraulique
US5152351A (en) * 1990-03-30 1992-10-06 Dr. Ing. H.C.F. Porsche Ag Protective arrangement for a piston rod of a hydraulic cylinder
WO2005028297A1 (fr) * 2003-09-24 2005-03-31 Jolly Drive S.R.L. Dispositif destine a proteger un element submerge, et notamment un ensemble piston-cylindre, contre la vegetation marine
US7594466B2 (en) 2007-01-12 2009-09-29 Rotobec Inc. Actuator with a protective sleeve for a piston
CN110410380A (zh) * 2019-08-27 2019-11-05 杭州先力液压机械有限公司 水冷加料属具及其工作方法

Also Published As

Publication number Publication date
DE3036053A1 (de) 1982-04-08
DD200533A5 (de) 1983-05-11
JPS57108587A (en) 1982-07-06
BR8106084A (pt) 1982-06-08
DK421181A (da) 1982-03-25
EP0048362A3 (fr) 1982-09-01
CA1176915A (fr) 1984-10-30

Similar Documents

Publication Publication Date Title
DE7731993U1 (de) Absperrschieber
EP0048362A2 (fr) Dispositif de protection pour tiges de piston de vérins, en particulier dans des appareils de combustion
EP1403576B1 (fr) Dispositif de fermeture d'une conduite pour la prevention contre l'explosion
DE2731549A1 (de) Vorrichtung zur bewegung und entfernung nicht brennbaren materials aus einem verbrennungsofen
EP0790090A2 (fr) Machine de coulée à dépression
DE4303484A1 (de) Verfahren und Vorrichtung zum klopfenden Reinigen von Gegenständen
DE3642552C2 (fr)
DE2847500A1 (de) Explosions- und detonationsgeschuetzte armatur
EP0976981A1 (fr) Dispositif d'alimentation en combustibles pour incinérateur
DE2336925A1 (de) Fliessmittel-mischkammer
DE2101170A1 (de) Beschickungsvorrichtung fur Mull veraschungsanlagen
EP0176528B1 (fr) Organe d'etranglement pour la reduction de la pression dans des conduites de transport
DE2022909B2 (de) Hochofenbeschickungsvorrichtung
DE2346515B1 (de) Industrie-Rauchgaskamin mit einem in einem Aussenmantelrohr aufgehaengten Stahl-Rauchgasrohr
EP0590371A1 (fr) Buse à air secondaire pour foyers
DE2610476B2 (de) Vorrichtung zum Einspritzen einer Dichtmasse in eine Stoßfuge o.dgl
DE3338296A1 (de) Anordnung bei der druckmessung in einem druckbehaelter
DE8802821U1 (de) Vorrichtung zum Entleeren von zu verschrottenden, Flüssigkeit und/oder Gas aufnehmenden Hohlkörpern
EP4151569A1 (fr) Vanne d'arrêt pourvue de dispositif de dérivation
DE2003738C (de) Seismische Gasexplosionseinnchtung
DE2431649A1 (de) Gasdichter schieber fuer schuettgueter
DE3339206A1 (de) Vorrichtung zum abdichten einer sich in eine und aus einer strahlenschutzkammer bewegenden druckuebertragungswelle
DE1508145C (de) Brenner fur den Betrieb mit Ol oder Gas, insbesondere fur Siemens Martin Ofen
DE1601959C (de) Vorrichtung zur Zugabe von rauchgas seitig Korrosionen verhindernden Stauben oder aufgeschlammten Stäuben
DE2503649A1 (de) Vorrichtung zur beseitigung der pulverabgase aus der umgebung des patronenlagers bzw. ladungsraumes einer feuerwaffe

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19811030

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840702

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WEBER, ERICH

Inventor name: MARTIN, JOHANNES JOSEF, DR.-ING.

Inventor name: MARTIN, WALTER JOSEF, DIPL.-ING.