EP0425567B1 - Rohrweiche einer zweizylinder-dickstoffpumpe - Google Patents

Rohrweiche einer zweizylinder-dickstoffpumpe Download PDF

Info

Publication number
EP0425567B1
EP0425567B1 EP89908693A EP89908693A EP0425567B1 EP 0425567 B1 EP0425567 B1 EP 0425567B1 EP 89908693 A EP89908693 A EP 89908693A EP 89908693 A EP89908693 A EP 89908693A EP 0425567 B1 EP0425567 B1 EP 0425567B1
Authority
EP
European Patent Office
Prior art keywords
ring
pipe
axial
rubber
pivot
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 - Lifetime
Application number
EP89908693A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0425567A1 (de
Inventor
Karl Schlecht
Hartmut Benckert
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.)
Putzmeister Concrete Pumps GmbH
Original Assignee
Putzmeister Werk Maschinenfabrik 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 Putzmeister Werk Maschinenfabrik GmbH filed Critical Putzmeister Werk Maschinenfabrik GmbH
Publication of EP0425567A1 publication Critical patent/EP0425567A1/de
Application granted granted Critical
Publication of EP0425567B1 publication Critical patent/EP0425567B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0084—Component parts or details specially adapted therefor
    • F04B7/0088—Sealing arrangements between the distribution members and the housing
    • F04B7/0096—Sealing arrangements between the distribution members and the housing for pipe-type distribution members

Definitions

  • the invention relates to a pipe switch of a two-cylinder thick matter pump with a swivel tube pivotable in front of a cylinder-side spectacle plate, with an axially displaceably arranged on the spectacle-side end of the swivel tube, which can be pressed against the spectacle plate by means of the hydrostatic internal pressure in the swivel tube and with a wear ring between the swivel tube and the A rubber-elastic ring arranged on the wear ring, the wear ring having at its end on the swivel tube side an axial guide surface guided on a radially outward-pointing cylindrical centering surface of the swivel tube, together with the centering surface delimiting a sealing gap, and on its spectacle-side end an annular shoulder pointing radially inward from the axial guide surface, whose front outer surface rests against the eyeglass plate and its inner surface serving the rubber-elastic ring as an axial abutment by an axial through which elastic ring bridged.,
  • the space is separated from the end face of the swivel tube and the swivel tube has at its front end a recess which preferably has the shape of a rectangular step and is open towards the axial guide surface and engages under the sealing ring on the inside.
  • Pipe switches of this type which referred to an automatic hydrostatic adjustment, called an automatic ring Wear wear ring are known (DE-C-26 14 895 and DE-A-31 03 321).
  • DE-C-26 14 895 and DE-A-31 03 321 in order to accommodate the rubber-elastic ring, mutually facing ring rotations, which engage under the ends of the rubber-elastic ring, are provided both in the swivel tube and in the wear ring.
  • Abrasive material can penetrate into the area of the ring twists and migrate behind the rubber-elastic ring.
  • this material can reach the radial gap between the wear ring and the swivel tube and exit through the radial gap, while the material penetrating the backward rotation between the wear ring and the sealing ring can no longer escape to the inside of the tube when the pressure is released.
  • the latter leads to an axial bracing of the pipe switch and thus to a heavy, wear-promoting switching.
  • the backward rotation is gradually filled with the hardening material, so that the elastic sealing ring can be drawn towards the inside of the pipe with increasing wear and increasing axial air and can be lost in the process. This is particularly the case if the thick matter pump draws vacuum during the backward conveyance.
  • the axial relative movement between the swivel tube and the wear tube can also lead to premature wear there under the action of the hardening material that escapes to the outside.
  • the axial movement mentioned is between, depending on the elasticity of the surrounding pump housing 1 and 3 mm.
  • the object of the invention is to create a pipe switch for two-cylinder thick matter pumps of the type specified at the outset, which ensures a reliable seal against material leakage and a low-wear axial guidance between the wear ring and the pipe switch.
  • the wear ring In practical operation, it is particularly important that when switching the pipe switch and clamping solid particles such as stones and the like between the wear ring and the glasses, the wear ring can spring back somewhat both in the axial and in the radial direction and can also tilt slightly. Furthermore, care must be taken to ensure that the abrasive material does not reach the sealing gap as far as possible and is deposited in the area of the sealing ring and can grow there gradually after hardening.
  • the inner surface of the ring shoulder formed on the wear ring is designed to be stepless in its region serving the rubber-elastic ring as an axial abutment towards the pipe interior and that the turning in the swivel pipe over at least the rubber-elastic ring engages under one third, preferably over more than half or even two thirds of its axial extent.
  • the rubber-elastic ring rests with its radial outer surface while performing an axial guide function, against the part of the axial guide surface of the wear ring bridging the recess and with its front end face against the axial inner surface of the ring shoulder arranged on the wear ring.
  • the rubber-elastic ring is supported with its radial inner surface by bridging the front space between the swivel tube and the ring shoulder against the radial boundary surface of the recess and with its rear end surface against the axial boundary surface of the recess of the swivel tube.
  • the arrangement according to the invention When pressurized, the arrangement according to the invention has the effect that the material to be conveyed, which tends to harden from the inside of the tube and pressures under elastic deformation, presses into the rubber-elastic ring in the region of its end face on the spectacle side.
  • the elastic ring in its rear part is pressed firmly against the sealing gap in the area of the axial guide surface between the wear ring and the swivel tube.
  • the tube switch can spring back in the direction of the spectacle plate due to the elastic deformation of the elastic ring.
  • radially continuous axially open grooves can also be arranged on the end face of the swivel tube, which grooves only have to be about 1 to 2 mm deep.
  • Another possibility of resilience in the sense described above and the access of material to be conveyed for the purpose of hydrastatic loading can be achieved in that bevels or preferably wedge-shaped ring grooves are arranged on the elastic ring towards the inside of the pipe. If the chamfers or ring grooves are provided at both ends, the sealing ring can be inserted regardless of the direction and turned over in the event of wear, thus doubling its service life. The chamfer on both sides also increases the resilience volume.
  • the swivel tube can be provided with a step stop for the wear ring at the rear end of the cylindrical axial guide surface, which ensures that the The gap remains open even when the wear ring is struck.
  • the part of the axial guide surface of the wear ring opposite the pivot tube or in the part of the wear ring can be used opposite part of the axial guide surface of the swivel tube, an annular groove for receiving an O-ring can be left out.
  • the diameter of the axial guide surface of the wear ring is larger than the effective diameter or even larger than the front outer diameter of the ring shoulder with which the wear ring rests on the spectacle plate. It is particularly advantageous if the ring surfaces of the wear ring acted upon by the hydrostatic pressure are designed such that the effective diameter of the force acting between the tube switch and the wear ring in the pressing direction is greater than the effective diameter of the force acting between the spectacle plate and the wear ring in the lifting direction Force.
  • the pipe switch shown in the drawing is intended for a two-cylinder thick matter pump, the delivery cylinders, not shown, of which are covered by a replaceable spectacle plate 5 on their mouths on the side of a material feed container.
  • a swivel tube 2 is arranged with its end face in front of the spectacle plate 5 so that it can swivel back and forth about a horizontal axis in such a way that its opening 20 alternately reaches one or the other of the two openings 4 of the spectacle plate 5 and the other opening 4 releases to the material feed container.
  • the swivel tube 2 opens into a delivery line, not shown.
  • a wear ring 1 With its cylindrical axial guide surface 21 is axially displaceably mounted on the cylindrical guide and centering surface 7 of the shoe tube 2.
  • the wear ring 1 At its front end, the wear ring 1 has a radially inwardly facing ring shoulder 22, the outer end face 23 of which against the surface 24 of the spectacle plate 5 rests and the annular inner surface 17 of which lies opposite the end face 16 of the swivel tube 2.
  • the ring 3 lies with its radial inner surface against the radial boundary surface 8 and with its rear end face 12 'against the axial step 6 of the turn in the pipe switch 2, while it with its radial outer surface against the part of the axial guide surface 21 of the wear ring bridging the turn 1 and rests with its front end face 12 against the radially outer part of the inner ring face 17 of the wear ring 1.
  • the end face 16 of the swivel tube 2 is separated from the inner surface 17 of the wear ring 1 by radially continuous, axially open grooves 11 or an annular gap 18, so that the viscous conveyed material conveyed under pressure by the swivel tube 2 directly from the inside to the grooves 11 or can reach the gap 18 bridging part of the elastic ring 3.
  • the swivel tube 2 strikes with the upper edge of the grooves 11 in the region of the inner surface 17 against the wear ring 1, while in the case of FIGS. 2 and 3 a step 15 is provided in the rear region of the swivel tube 2 as a limit stop for the wear ring 1.
  • the rubber-elastic ring 3 with its essentially rectangular cross-section takes on not only a sealing function due to its var tension but also the function of automatic tracking of the wear ring 1 in the event of wear.
  • its radial outer surface represents an extension of the axial guide and centering surface 21.
  • the axial extent of the ring 3 is at least twice, preferably one Multiple of the axial extent of the guide and centering surface 21 on the swivel tube 2, there is the possibility within the necessary play between the wear ring 1 and the swivel tube 2 in the area of the centering surface 21 that the wear ring 1 due to the elastic properties of the ring 3 can tilt easily if solid particles get into the gap area between the contact surfaces 23 and 24 of the wear ring 1 and the spectacle plate 5. This results in a considerable reduction in wear and thus a longer service life of the wear ring 1 and the spectacle plate 5.
  • the ring surfaces 23 and 17 of the wear ring 1, which are acted upon by the hydrostatic pressure, are arranged and designed such that the force 31 acting in the pressing direction is greater than the lifting force 30.
  • the effective diameter 10 of the force 31 acting between the swivel tube 2 and the wear ring 1 in the pressing direction is greater than the effective diameter 9 of the force 30 acting between the spectacle plate 5 and the wear ring 1 in the lifting direction.
  • the axial guide - And centering diameter 7 of the wear ring 1 larger than the effective diameter 9, with which the wear ring 1 rests on the eyeglass plate 5 and even larger than the end outer diameter of the ring shoulder 22, with which the wear ring 1 rests on the eyeglass plate 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Joints Allowing Movement (AREA)
  • Reciprocating Pumps (AREA)
  • Sealing Devices (AREA)
EP89908693A 1988-07-19 1989-07-08 Rohrweiche einer zweizylinder-dickstoffpumpe Expired - Lifetime EP0425567B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824466A DE3824466A1 (de) 1988-07-19 1988-07-19 Mehrzylinder-dickstoffpumpe
DE3824466 1988-07-19

Publications (2)

Publication Number Publication Date
EP0425567A1 EP0425567A1 (de) 1991-05-08
EP0425567B1 true EP0425567B1 (de) 1992-10-07

Family

ID=6359025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89908693A Expired - Lifetime EP0425567B1 (de) 1988-07-19 1989-07-08 Rohrweiche einer zweizylinder-dickstoffpumpe

Country Status (4)

Country Link
EP (1) EP0425567B1 (ja)
JP (1) JP2514729B2 (ja)
DE (2) DE3824466A1 (ja)
WO (1) WO1990001117A1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905355C2 (de) * 1989-02-22 1994-06-23 Schlecht Karl Rohrweiche für Zweizylinder-Dickstoffpumpen
US5302094A (en) * 1988-07-19 1994-04-12 Putzmeister-Werk Maschinenfabrik Gmbh Tube switch for a double-cylinder sludge pump
KR100390483B1 (ko) * 1995-12-13 2003-09-06 엘지전자 주식회사 티브이의고스트제거방법
DE10131784A1 (de) * 2001-07-04 2003-01-16 Putzmeister Ag Vorrichtung zum Fördern von fließ- und schüttfähigem Fördergut
DE502004003944D1 (de) 2004-03-26 2007-07-12 Continental Ag Fahrzeugluftreifen
GB2416569A (en) 2004-07-27 2006-02-01 Clarke Uk Ltd Method of and a pump for pumping drill cuttings
DE102013215990A1 (de) * 2013-08-13 2015-02-19 Putzmeister Engineering Gmbh Zweizylinder-Dickstoffpumpe mit Rohrweiche

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2614895C3 (de) * 1976-04-07 1987-01-22 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Betonpumpen-Rohrweiche
DE2829181A1 (de) * 1978-07-03 1980-01-17 Scheele Maschf W Rohrweiche fuer eine betonpumpe
DE2921735A1 (de) * 1979-05-29 1980-12-04 Teka Baumaschinen Gmbh Vorrichtung zum dichten einer betonpumpe
DE3103321C2 (de) * 1981-01-31 1987-05-07 Friedrich Wilh. Schwing Gmbh, 4690 Herne Zweizylinder-Dickstoffpumpe
JPS59172287U (ja) * 1983-05-06 1984-11-17 石川島播磨重工業株式会社 コンクリ−トポンプのシ−ル構造

Also Published As

Publication number Publication date
WO1990001117A1 (de) 1990-02-08
JPH03506060A (ja) 1991-12-26
JP2514729B2 (ja) 1996-07-10
DE3824466A1 (de) 1990-01-25
EP0425567A1 (de) 1991-05-08
DE58902434D1 (de) 1992-11-12

Similar Documents

Publication Publication Date Title
DE3153268C2 (en) Two-cylinder viscous-material pump, preferably concrete pump
EP0188730B1 (de) Membranpumpe mit hydraulisch angetriebener Rollmembran
DE2903749C2 (de) Kolbenpumpe mit S-förmig gekrümmtem Schwenkrohr
DE1288392B (de) Drehschieber
DE3611952C2 (de) Kolbenpumpe mit verbesserter Abdichtung
EP2387667A1 (de) Verfahren zur förderung breiiger massen und pumpvorrichtung zur förderung breiiger massen
EP0425567B1 (de) Rohrweiche einer zweizylinder-dickstoffpumpe
EP1110017B1 (de) REIBUNGSARME DICHTUNG und hydraulikzylinder
DE3232083C2 (ja)
EP0052192A1 (de) Vorrichtung an Betonpumpen
DE69303376T2 (de) Rohrweiche für eine zweizylinder dickstoffpumpe
EP0464165B1 (de) Höchstdruckplungerpumpe
DE2415276B1 (de) Pumpe zum Fördern von Dickstoffen, insbesondere Beton
DE3410211A1 (de) Vorrichtung zum dichten einer betonpumpe
EP0551590A1 (de) Hochdruckplungerpumpe, vorzugsweise für Arbeitsdrücke oberhalb 2000 bar
DE3430193A1 (de) Schwenkrohrsystem fuer betonpumpen
EP1053401B1 (de) Rohrweiche für zweizylinder-dickstoffpumpe
DE3904862C2 (de) Rohrweiche für Zweizylinder-Dickstoffpumpen
DE1503390A1 (de) Hydraulische Membranpumpe
DE3905355C2 (de) Rohrweiche für Zweizylinder-Dickstoffpumpen
EP0112404A1 (de) Zweizylinderdickstoffpumpe, vorzugsweise Betonpumpe
WO2014206698A1 (de) Umschaltvorrichtung für eine dickstoffpumpe
DE2851354A1 (de) Pumpe fuer breiige massen, vorzugsweise beton
DE3931487A1 (de) Abdichtung fuer kolben in axialkolbenmaschinen
DE1918609A1 (de) Gleitring

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: 19900723

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT NL

17Q First examination report despatched

Effective date: 19910916

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT NL

REF Corresponds to:

Ref document number: 58902434

Country of ref document: DE

Date of ref document: 19921112

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020610

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020612

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20020619

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030708

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030725

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20030708

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040331

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20040201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050708