EP0027654A1 - Pompe à béton avec un tiroir à soulagement hydraulique - Google Patents

Pompe à béton avec un tiroir à soulagement hydraulique Download PDF

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Publication number
EP0027654A1
EP0027654A1 EP19800106348 EP80106348A EP0027654A1 EP 0027654 A1 EP0027654 A1 EP 0027654A1 EP 19800106348 EP19800106348 EP 19800106348 EP 80106348 A EP80106348 A EP 80106348A EP 0027654 A1 EP0027654 A1 EP 0027654A1
Authority
EP
European Patent Office
Prior art keywords
concrete
slide
control
connections
main control
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.)
Ceased
Application number
EP19800106348
Other languages
German (de)
English (en)
Inventor
Karl Schlecht
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0027654A1 publication Critical patent/EP0027654A1/fr
Ceased legal-status Critical Current

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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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
    • F04B7/0233—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
    • F04B9/1176—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
    • F04B9/1178—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders

Definitions

  • the invention relates to a concrete pump with a hydraulically relieved slide valve according to the preamble of claim 1.
  • Such concrete pumps operate according to the so-called single-circuit control system because they are supplied by only one hydraulic pump.
  • DE-PS 2 441 831 describes a circuit in which the main control slide of the drive cylinder for the concrete delivery pistons has a spring-centered central position. With this circuit, the hydraulic connections of the concrete delivery cylinders are connected to each other and to the high-pressure connection at the same time, with the aim of relieving the pressure on the concrete slide during the switching process. The concrete delivery pistons come into the floating position, ie they briefly withdraw from the high pressure in the concrete line. This immediately relieves the load on the concrete slide valve and can then switch through with little effort and less friction and wear.
  • the object of the invention is to relieve the concrete shoot bers by ensuring a more effective floating position of the concrete delivery pistons.
  • this circuit brings about a real relief of the concrete slide valve during the reversing process while avoiding the disadvantages described above.
  • One is largely independent of the effects of the preload in the closed circuit and the more or less good centering effect of the centering spring in the main spool.
  • FIG. 1 shows a first embodiment of the circuit with a single drive cylinder for the concrete slide
  • Fig. 2 shows a second embodiment of the circuit with two drive cylinders for the concrete slide.
  • the control piston in the main control slide 11 moves hydraulically pushed out of its end position in the direction of the middle position. It can be assumed that the concrete slide can not be moved because it is clamped by the concrete pressure. However, as soon as the main hydraulic control piston in the main control slide 11 begins to plunge into its long central position 44, 43, 45, a connection of the connections of the concrete delivery cylinders to the low pressure line 10 enables the concrete delivery pistons 15, 16 to withdraw from the concrete pressure and thus a concrete pressure Bring relief.
  • two individual cylinders 31, 32 can also be used in a known manner, as shown in FIG. 2.
  • An additional switching pulse then occurs through lines 33, 34, which runs parallel to that of chokes 18, 19.
  • the throttles 18, 19 can initiate the switching operation of the main control slide 11 with a small opening. If the concrete slide valve switches through very quickly and without resistance due to the action of the drive cylinder 31, 32 with occasional low friction or low concrete pressure, after reaching the end position through the lines 33, 34, a step-by-pulse becomes parallel to that of the throttles 18, 19 given. In this way, an unnecessary increase in pressure and a waiting time for the hydraulic pump 3, and thus also the occurrence of pressure surges and energy loss, are avoided.
  • the check valves 37, 38 can optionally be used in the control lines 33, 34 are switched on in order to discharge the control pressure coming from the throttles 18, 19 through the drive cylinders 31, 32 of the concrete slide valve 39 to the tank 36, or, if there is no tank connection in the line 35, to the other cylinder side avoid.
  • these check valves 37, 38 can be omitted if the main control slide 11 also receives, as is known, additional centering springs. Then the lines 33, 34 are connected to the line 35 to the tank 36 while the drive cylinder 31, 32 of the concrete slide 39 is switched through. This allows a particularly soft switching setting for certain operating conditions and also allows large, dirt-resistant openings in the throttles 18, 19.
  • These throttles 18, 19 can both be adjustable, optionally only one adjustable and the other permanently adjustable.
  • the throttles 47, 48 in the rod-side connecting line 35 of the drive cylinders 31, 32 can cause a similarly rapid connection of the main control spool 11 by backwater in the rod space of these cylinders with exceptionally rapid switching of the concrete slide 39. This favors smooth running of the machine, smooth switching of the concrete slide and automatic, internal compensation of the control speeds with varying oil consistency as a result of temperature fluctuations, or even if the delivery rate of the hydraulic pump 3 changes significantly.
  • the reversing switching pulse can run in a known manner instead of the mechanical design via the rocker switch 14 and the reversing slide 13 also via electrical or hydraulic switching pulses which originate directly from the drive cylinder 1, be it through piston rod grooves or control bores on the cylinder jacket.
  • Such designs are known and can be operated as desired Conditions and conditions of use for the thick matter pump in question are used in connection with the subject matter of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP19800106348 1979-10-20 1980-10-18 Pompe à béton avec un tiroir à soulagement hydraulique Ceased EP0027654A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792942560 DE2942560A1 (de) 1979-10-20 1979-10-20 Betonpumpe mit hydraulisch entlastetem schieber
DE2942560 1979-10-20

Publications (1)

Publication Number Publication Date
EP0027654A1 true EP0027654A1 (fr) 1981-04-29

Family

ID=6084037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800106348 Ceased EP0027654A1 (fr) 1979-10-20 1980-10-18 Pompe à béton avec un tiroir à soulagement hydraulique

Country Status (2)

Country Link
EP (1) EP0027654A1 (fr)
DE (1) DE2942560A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0167635A1 (fr) * 1984-06-05 1986-01-15 COMPAGNIA ITALIANA FORME ACCIAIO S.p.A. Circuit hydraulique pour le contrôle de pompes à piston alternatif

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3333849C2 (de) * 1983-09-20 1987-03-26 Maschinenfabrik Walter Scheele GmbH & Co KG, 4750 Unna-Massen Ein -oder Mehrzylinderpumpe für breiige Massen, insbesondere Betonpumpe
DE3509788A1 (de) * 1983-09-20 1986-10-02 Maschinenfabrik Walter Scheele GmbH & Co KG, 4750 Unna-Massen Abbremssteuerung fuer den betonverteiler-umschaltzylinder einer betonpumpe
DE102005008217A1 (de) * 2005-02-22 2006-08-31 Putzmeister Ag Hydraulikantrieb, insbesondere für Zweizylinder-Dickstoffpumpen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH224724A (de) * 1941-11-19 1942-12-15 Sulzer Ag Pumpanlage zur Förderung von Flüssigkeiten auf hohen Druck.
DE2126446A1 (de) * 1971-05-27 1972-12-07 Wilhelm Reich Kg, 7900 Ulm Hydraulischer Zwillingskolbenantrieb, insbesondere für Betonpumpen
DE2447054A1 (de) * 1973-10-12 1975-04-17 Italiana Forme Acciaio Dreiwege-verteiler fuer betondoppelpumpen
DE2411391A1 (de) * 1974-03-09 1975-09-18 Scheele Maschf W Folgesteuerung fuer den druckmittelbetaetigten antrieb einer kolbenpumpe zum foerdern von beton

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH224724A (de) * 1941-11-19 1942-12-15 Sulzer Ag Pumpanlage zur Förderung von Flüssigkeiten auf hohen Druck.
DE2126446A1 (de) * 1971-05-27 1972-12-07 Wilhelm Reich Kg, 7900 Ulm Hydraulischer Zwillingskolbenantrieb, insbesondere für Betonpumpen
DE2447054A1 (de) * 1973-10-12 1975-04-17 Italiana Forme Acciaio Dreiwege-verteiler fuer betondoppelpumpen
FR2247628A1 (en) * 1973-10-12 1975-05-09 Italiana Forme Acciaio Compagn Three-way distributor for twin-cylinder concrete pump - has rotatable S-shaped pipe section connecting with one or other cylinder
DE2411391A1 (de) * 1974-03-09 1975-09-18 Scheele Maschf W Folgesteuerung fuer den druckmittelbetaetigten antrieb einer kolbenpumpe zum foerdern von beton

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0167635A1 (fr) * 1984-06-05 1986-01-15 COMPAGNIA ITALIANA FORME ACCIAIO S.p.A. Circuit hydraulique pour le contrôle de pompes à piston alternatif

Also Published As

Publication number Publication date
DE2942560A1 (de) 1981-04-30

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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: 19811026

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Effective date: 19831219