EP2243965A2 - Oszillierender Druckmittelzylinder für Betonpumpen mit hydraulisch angetriebener Zahnstangeneinheit - Google Patents

Oszillierender Druckmittelzylinder für Betonpumpen mit hydraulisch angetriebener Zahnstangeneinheit Download PDF

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Publication number
EP2243965A2
EP2243965A2 EP10160544A EP10160544A EP2243965A2 EP 2243965 A2 EP2243965 A2 EP 2243965A2 EP 10160544 A EP10160544 A EP 10160544A EP 10160544 A EP10160544 A EP 10160544A EP 2243965 A2 EP2243965 A2 EP 2243965A2
Authority
EP
European Patent Office
Prior art keywords
box
rack
gasket
way
sealed
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.)
Granted
Application number
EP10160544A
Other languages
English (en)
French (fr)
Other versions
EP2243965A3 (de
EP2243965B1 (de
Inventor
Giancarlo Musiani
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
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2243965A2 publication Critical patent/EP2243965A2/de
Publication of EP2243965A3 publication Critical patent/EP2243965A3/de
Application granted granted Critical
Publication of EP2243965B1 publication Critical patent/EP2243965B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type

Definitions

  • the invention relates to apparatus for pumping concrete, mortar or other liquid products, which may be dense or incoherent, over a distance, the apparatus comprising a hopper into which the concrete for pumping is placed, the hopper containing in its lower part a gooseneck pipe, one end of which is connected to the concrete removal pipe and made to rotate in an alternating way by an external oscillatory actuator, while the other end oscillates in a pendulum-like way and alternately contacts two apertures to which corresponding reciprocating single-acting pump units, driven by corresponding hydraulic actuators, are permanently connected.
  • the other pump unit is in the phase in which the concrete drawn in previously is discharged through said gooseneck pipe which is in contact with it.
  • An actuator of this type comprises a rack which is driven at its ends by hydraulic cylinder and piston units and which engages with a ring gear fixed on one of the two ends of the oscillation shaft of said gooseneck pipe.
  • the gear is housed in an oil bath in a box-like body in which are formed the opposing chambers in which the end pistons of the rack slide in a sealed way, with attached hydraulic dampers for limiting the stroke.
  • the projection of these chambers is limited, and the box-like body which contains them is provided with external cooling fins at the positions of the chambers.
  • the actuator comprises a box-like body 1 formed from a single piece made by casting a suitable metal alloy in a mould with a core box, or by any other suitable method.
  • the body 1 takes the form of an octagon elongated on the horizontal plane, with a curved and upwardly convex upper side 101 and with symmetrical horizontal parallelepipedal extensions 201, 201' at the opposite ends.
  • Wear liners 5, 5' are inserted with a lateral seal by means of gaskets 4, 4' into the tubes 2, 2' with a high degree of precision, each liner being provided on its outer end with a small outer collar 105, 105' which is housed in a corresponding recess of the flange 102, 102', the cylindrical projection 107, 107' of a cap 7, 7' being inserted into each liner in a sealed way by means of the gaskets 6, 6', each cap also having a square base and being provided in its corner areas with through holes of stepped section to allow the passage of the shanks of screws which are indicated schematically by 8, 8' and to contain the heads of these screws, which fix the parts 2, 7 and 2', 7' to the extensions 201, 201' of the body 1 with the interposition of the corresponding wear liners 5, 5'.
  • the end pistons 110, 110' of the rack 10 slide with a lateral seal, provided by means of the gaskets 9, 9', in these liners, the rack having an exposed portion, between the guide parts 2, 5 and 2', 5', which interacts with a ring gear 11 which is described more fully below.
  • the shanks 207, 207' are axially hollow and have threaded holes 12, 12' opening on the caps 7, 7', to which it is possible to connect the pipes of the hydraulic circuit for driving the actuator, these pipes having alternating delivery and discharge functions, to provide the desired reciprocating motion of the rack 10.
  • the body 1 has, below the rack and the guide parts for the corresponding pistons, a wide bowl-shaped chamber 13, which can contain a large quantity of oil and whose base wall 301 is suitably distant from said rack, in such a way that any impurities due to the wear of the parts are collected on this base wall in a position remote from the moving parts, with the consequent advantages.
  • the wall 301 is provided with a hole with a sealing plug 14, which can be removed in order to discharge all the oil contained in the body 1, together with the impurities, for the periodic replacement of the internal lubricating oil of the actuator, the level of the oil being subsequently restored through feed, overflow and/or inspection holes 15, 15' provided in the body 1 at a level above the tubes 2, 2'.
  • the box-like body 1 is provided externally, in its upper part, with two symmetrical lateral appendages 401, 401' with holes 16, 16' for the passage of corresponding fixing screws, while in its lower part the body 1 has inner parts 501, 501' of increased thickness in which through holes 17, 17' are formed, these holes also being adapted for the passage of fixing screws.
  • the outer front surface of the body 1 is provided with suitable heat exchange fins 18, as shown in part in Figure 2 , to improve the dissipation of the heat produced by the reciprocating movement of the rack and by its interaction with the ring gear 11.
  • the box-like body 1 is provided on opposite faces with apertures 601, 601' which are machined on their inner diameters in such a way that they are aligned axially with each other and which contain low friction rings 19, 19' which are in close contact with them, the rings being made, for example, from suitable plastic material or appropriate sintered material and being capable of supporting rotatably the end portions of a steel sleeve 111, which carries the ring gear 11 which is made in one piece with it or is fitted on it, and whose ends project from the body 1 in the form of a rear portion 211, having an outer gasket 20 for connection to the tubing for removing the pumped concrete, and a front portion 311 1 which can be fixed, with the interposition of a sealing gasket 22, to a sleeve 21 whose other end is adapted to be fixed and connected in a sealed way by means of a gasket 23 to the end of the gooseneck pipe CC which is to be made to oscillate by the actuator in question within the
  • the aforesaid support rings 19, 19' are provided, on their inner surfaces in contact with the sleeve 111, with lubrication grooves which allow a sufficient degree of outward permeation of some of the lubricating oil which is contained in the body 1, for which reason suitable means are provided outside the apertures 601, 601' of the body 1 to prevent leaks of said lubricating oil.
  • the rear aperture 601 is provided with a projecting collar 701 which forms an inner annular chamber 24 in which is inserted an internal gasket of metal and rubber which comprises a metal ring 25 for contacting the ring 19 and a part 125 made from elastomeric material, with a C-shaped profile and an internal spring, which interacts with the outer lateral surface of the portion 211 of the aperture 111 to form a lateral seal.
  • a projecting collar 701 which forms an inner annular chamber 24 in which is inserted an internal gasket of metal and rubber which comprises a metal ring 25 for contacting the ring 19 and a part 125 made from elastomeric material, with a C-shaped profile and an internal spring, which interacts with the outer lateral surface of the portion 211 of the aperture 111 to form a lateral seal.
  • annular cap 27 is then mounted on said collar 701 in a sealed way by means of the gasket 26, this cap interacting in a sealed way with the portion 211 of the aperture 111 by means of a gasket 126 on its inner diameter, and being provided externally with a pair of diametrically opposite lugs 127 which can be fixed with screws 28 to corresponding outer thickened areas 801 of the body 1.
  • the front aperture 601' is machined on its outer diameter in such a way that it has a collar 901 which is mounted, with a sealing gasket 29, in a hole 30 formed in the rear plate P of the hopper T, and which terminates in said hopper with a portion 130 of smaller diameter, to retain in said hole 30 a composite metal and rubber gasket, with an outer ring 31 made from metal and with an inner annular insert 131 made from a suitable elastomeric material, with interacts in a sealed way with the outer lateral surface of the sleeves 111 and 21.
  • the metal ring 31 is provided with a plurality of radial holes 32 which communicate with both inner and outer annular manifolds, indicated by 132, the outer of which communicates with a pipe 33 formed in the plate P and leading to a connector 34 which is connected to a source of pressurized air (not shown) to pressurize the rubber part 131 of the gasket in a centripetal way, in order to maintain the best possible contact of the gasket with the sleeves 111, 21, and in order to prevent the ingress of liquid and dirt into the box-like body 1 if this gasket becomes worn.
  • a flowmeter or any suitable means or sensor for indicating an anomalous flow of air towards the sealing gasket 31, 131 can be connected to the connector 34, to provide a warning when this gasket needs to be replaced.
  • the actuator described herein is highly reliable, is easy to construct and to maintain by both routine and extraordinary procedures, and has a long service life, in part due to the fact that the actuator can be completely restored and returned to its best operating condition by periodically changing the wear liners 5, 5' and the piston rings and sealing gaskets 9, 9' of the pistons 110, 110' of the rack, and by periodically changing the phase of the ring gear 11 with respect to the rack 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Devices (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Reciprocating Pumps (AREA)
  • Actuator (AREA)
EP20100160544 2009-04-22 2010-04-21 Oszillierender Druckmittelzylinder für Betonpumpen mit hydraulisch angetriebener Zahnstangeneinheit Active EP2243965B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBO20090024 ITBO20090024U1 (it) 2009-04-22 2009-04-22 Attuatore di movimento oscillante, per pompe da calcestruzzo, con gruppo a pignone e cremagliera mosso idraulicamente.

Publications (3)

Publication Number Publication Date
EP2243965A2 true EP2243965A2 (de) 2010-10-27
EP2243965A3 EP2243965A3 (de) 2013-10-09
EP2243965B1 EP2243965B1 (de) 2015-03-25

Family

ID=42357843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100160544 Active EP2243965B1 (de) 2009-04-22 2010-04-21 Oszillierender Druckmittelzylinder für Betonpumpen mit hydraulisch angetriebener Zahnstangeneinheit

Country Status (2)

Country Link
EP (1) EP2243965B1 (de)
IT (1) ITBO20090024U1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013001173A1 (fr) 2011-06-27 2013-01-03 Ksb S.A.S. Actionneur a quart tournant a pignon non cylindrique et cremaillere complementaire

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT223832Z2 (it) 1990-03-30 1995-10-03 Distributore oscillante per pompe da calcestruzzo, azionato da un complesso a pignone-cremagliera mosso idraulicamente.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245271A (en) * 1962-01-08 1966-04-12 Central States Tooling Service Hydraulic actuator
US3209541A (en) * 1963-07-29 1965-10-05 William P Dunphy Hydraulic remote control apparatus
US3834284A (en) * 1973-04-05 1974-09-10 Deere & Co Hydraulic steering for tractors and like vehicles
US5353690A (en) * 1993-03-04 1994-10-11 Shin Guo S Actuator type reciprocating mechanism
US5323690A (en) * 1993-03-05 1994-06-28 Sims James O Fluid actuator assembly for imparting rotational movement to a boom

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT223832Z2 (it) 1990-03-30 1995-10-03 Distributore oscillante per pompe da calcestruzzo, azionato da un complesso a pignone-cremagliera mosso idraulicamente.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013001173A1 (fr) 2011-06-27 2013-01-03 Ksb S.A.S. Actionneur a quart tournant a pignon non cylindrique et cremaillere complementaire

Also Published As

Publication number Publication date
ITBO20090024U1 (it) 2010-10-23
EP2243965A3 (de) 2013-10-09
EP2243965B1 (de) 2015-03-25

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