WO2021028528A1 - Ensemble tige de piston, cylindre hydraulique et mât articulé - Google Patents

Ensemble tige de piston, cylindre hydraulique et mât articulé Download PDF

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Publication number
WO2021028528A1
WO2021028528A1 PCT/EP2020/072742 EP2020072742W WO2021028528A1 WO 2021028528 A1 WO2021028528 A1 WO 2021028528A1 EP 2020072742 W EP2020072742 W EP 2020072742W WO 2021028528 A1 WO2021028528 A1 WO 2021028528A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston rod
weld
build
rod unit
end piece
Prior art date
Application number
PCT/EP2020/072742
Other languages
German (de)
English (en)
Inventor
Mark Mors
Original Assignee
Schwing 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 Schwing Gmbh filed Critical Schwing Gmbh
Publication of WO2021028528A1 publication Critical patent/WO2021028528A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/04—Welding for other purposes than joining, e.g. built-up welding
    • B23K9/044—Built-up welding on three-dimensional surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/34—Laser welding for purposes other than joining
    • B23K26/342—Build-up welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/003—Pistons

Definitions

  • Piston rod unit hydraulic cylinder and articulated mast The invention relates to a piston rod unit for a hydraulic cylinder, with at least one piston-side end piece, and at least one rod-eye-side end piece, a hollow piston rod which is arranged between the end pieces, with at least one of the end pieces via a welded connection the piston rod is connected, and a hydraulic cylinder with such a piston rod unit, and an articulated mast of a large manipulator with such a hydraulic cylinder and a method for producing a piston rod unit.
  • a piston rod unit is from DE 10 2013 008 351 B3 or
  • EP 1 346 157 B1 known.
  • the piston rods are on, especially in hydraulic cylinders
  • connection area between the hollow piston rod and the end piece on the rod eye side with the pin receptacle for connecting the piston rod to a mast segment of the articulated mast is a critical area because the end pieces deform under the very high tensile and compressive forces to be transmitted and these deformations also affect the Connection area to be transferred to the hollow piston rod. This initially leads to elastic deformation of the hollow piston rod in the connection area. In the event of permanent overstress, it cannot be ruled out that in the transition area between the hollow piston rod and the end piece, overload phenomena such as cracks occur and the entire piston rod has to be replaced.
  • a piston rod unit with the features of claim 1 and a hydraulic cylinder according to claim 8, an articulated mast according to claim 9 and a method according to claim 10.
  • the welded connection for connecting the piston rod to the end piece in an inside The build-up weld applied to the piston rod is embedded, the connection area formed by the welded connection between the end piece and the piston rod can be reinforced in a simple manner without increasing the weight of the entire unit, since the build-up weld has a piston rod on the inside that is designed for the tensile and compressive forces to be transmitted reinforced. With the reinforcement on the inside of the hollow piston rod through the build-up welding in the connection area, a stable design can easily be implemented that does not require any additional installation space.
  • the wall thickness of the piston rod in the connection area to the end pieces which is necessary for a stable design of the piston rod unit can easily be achieved by means of surfacing through the hollow piston rod, which is equipped with a smaller wall thickness on the inside.
  • a light, thin-walled, hollow piston rod can be used which has sufficient strength in the connecting area to realize a stable, yet lightweight piston rod unit.
  • the build-up welding can be applied, for example, using methods known in the prior art with a welding torch, a welding electrode or the like.
  • the build-up weld is reworked by machining.
  • the notch effect can be reduced.
  • the build-up weld is machined after the application, thereby smoothing the surface that has been applied.
  • the build-up weld applied to the tubular piston rod is, in the simplest case, smoothed by machining by turning.
  • a weld pool protection for the welded connection between the piston rod and an end piece can also be worked out by machining the previously applied overlay weld. This eliminates the need for reworking the welded connection after connecting the end pieces to the piston rod.
  • Deposition welding has a cross-section which decreases in the course of the piston rod away from the end piece. With the reducing cross-section During build-up welding, the wall thickness increased by the build-up welding in the course of the piston rod away from the end piece merges gently into the constant wall cross-section of the piston rod. As a result, an optimized force curve can be realized, which offers an operationally stable yet lightweight piston rod unit, which is located in the connection area of the
  • Piston rod with the welded end pieces is optimized with regard to the notch effect.
  • a particularly advantageous embodiment of the invention relates to the fact that the build-up weld applied to the piston rod is also arranged on the end face of the piston rod.
  • Overlay welding on the tubular piston rod can easily be extended to form a weld pool backup.
  • the amount of material to be removed can be reduced by the frontal application.
  • a particularly advantageous embodiment of the invention provides that the piston rod is formed from a tube with a constant wall cross-section over its entire length.
  • tubular standard components can be used for the piston rod, which makes the production of the piston rod unit cheaper. So far, the piston rods have often been bored out of solid components, which leads to considerable manufacturing costs for this assembly.
  • a rolled tube is a tubular standard component that can be manufactured particularly cheaply and that by embedding the welded connection in the build-up weld can now also be used to manufacture a light and stable piston rod unit with welded end pieces.
  • An embodiment which provides that the build-up weld is applied as a spiral-shaped bead is particularly advantageous.
  • the weld metal can be easily applied to the inside of the piston rod as a spiral bead.
  • About the spiral-shaped bead increases the wall thickness of the piston rod in the areas connecting to the end pieces to be welded.
  • the spirally applied bead provides a notch effect-optimized reinforcement of the hollow piston rod at the ends.
  • the invention also relates to a hydraulic cylinder with a piston rod unit as described in more detail above and below.
  • a hydraulic cylinder equipped with such a piston rod unit has not only a lower weight but also a high load capacity, since the piston rod reinforced with the overlay welding can absorb greater forces without the weight of the piston rod unit being significantly increased by the applied welding material.
  • the subject matter of the invention is an articulated mast of a large manipulator, in particular a truck-mounted concrete pump, with a plurality of mast segments, the mast segments on articulated joints each being pivotable about articulated axes relative to an adjacent mast segment or a stool, with at least one hydraulic cylinder as described above and below Pivoting movement caused in at least one articulated joint.
  • the demands on the mast length i.e. the reach of the articulated masts of large manipulators such as truck-mounted concrete pumps, are constantly growing.
  • particularly light hydraulic cylinders are advantageous.
  • the use of lightweight hydraulic cylinders saves the dead weight of the articulated masts, so that greater ranges are possible.
  • the invention also relates to a method for producing a piston rod unit for a hydraulic cylinder, as described in more detail above and below, comprising the following steps:
  • connection of workpiece and end piece by welding at the surfacing With the build-up welding on the inside of the tube of the tubular workpiece, the latter can be additionally reinforced at the ends very easily in order to make the connection area to the end pieces more stable. With the subsequent machining of the overlay weld, the notch stress can be very easily reduced by smoothing the overlay weld.
  • the end pieces for welding with the piston rod can easily be positioned on the overlay weld processed in this way, so that the connection of workpiece and end piece is facilitated by welding on the overlay weld. As a result, the welded connection can easily be embedded in the build-up weld applied on the inside of the piston rod.
  • FIG. 2 hydraulic cylinder according to the invention
  • FIG. 3 piston rod unit according to the invention
  • FIG. 4 sectional view of the piston rod unit
  • FIG. 5 cladding in the piston rod
  • FIG. 7 sectional view during post-machining
  • FIG. 9 processed build-up welding on the inner and front sides
  • FIG. 1 denoted by the reference number 12, an articulated mast 12 according to the invention is shown on a large manipulator 13 designed as a truck-mounted concrete pump.
  • the articulated mast 1 is built on a pivoting bolster 16 which can rotate about a floch axis 17 and which accommodates the articulated mast 12 in a rotatable and pivotable manner with respect to the chassis 18 of the large manipulator 13 via an articulated joint 15.
  • the articulated mast 12 has several mast segments 14 which, in articulated joints 15, can each be pivoted about articulated axes relative to an adjacent mast segment 14 or the turntable 16.
  • the articulated joints 15 are each assigned hydraulic cylinders 2, which cause the pivoting movement of the mast segments 14 in the articulated axes.
  • the articulated mast 12 shown folded in FIG. 1 can be unfolded via this pivoting movement.
  • liquid concrete discharged via the feed hopper 19 can be conveyed by means of a thick matter pump unit in the truck-mounted concrete pump through the concrete delivery lines 20 arranged on the articulated mast 12 within the range of the articulated mast 12 to the point of use on the construction site.
  • FIG. 2 shows a hydraulic cylinder 2 according to the invention, as it is assigned to the articulated joints 15 of the articulated mast 12 in FIG. 1, in a single view.
  • the piston rod unit 1 is shown retracted into the cylinder body 21 of the hydraulic cylinder 2, so that only the end piece 4 on the rod eye side protrudes from the cylinder body 21.
  • FIG. 3 shows an individual view of the piston rod unit 1 according to FIG.
  • This piston rod unit 1 according to the invention has a piston-side end piece 3 on which a piston 22 is arranged. Furthermore, the piston rod unit 1 has an end piece 4 on the rod eye side. The end piece 4 on the rod eye side has two laterally protruding pipe stubs 23. A hinge pin for connecting the hydraulic cylinder 2 to a mast segment 14 is guided in this pipe socket 23. The end pieces 3, 4 of the piston rod unit 1 are connected to one another via a piston rod 5.
  • FIG. 4 shows the piston rod unit 1 according to FIG. 3 in a sectional view.
  • a view into the hollow piston rod 5 of the piston rod unit 1 is possible.
  • both the end piece 4 on the rod eye side and the end piece 3 on the piston side are each connected to the piston rod 5 via a welded connection 6.
  • build-up welds 7, 8 can be seen, which increase the wall thickness of the piston rod 5 in the areas connecting to the end pieces 3, 4.
  • the build-up welds 7, 8 have a cross-section 9, 10 that decreases in the course of the piston rod 5 away from the end piece 3, 4.
  • the piston rod 5 is formed from a tube with a wall cross-section D that is constant.
  • This tube can preferably be rolled.
  • the wall thickness increases steadily as it progresses towards the ends of the piston rod 5 due to the internal overlay weld 7, 8 applied.
  • the build-up welds 7, 8 each form weld pool backups 24 for the welded connections 6 between the piston rod 5 and the end pieces 3, 4.
  • Both the smooth course of the cross-section 9, 10 of the build-up welds 7, 8 and the shape of the Weld pool securing devices 24 can be produced excellently by machining, as will be explained in more detail below.
  • FIG. 5 shows the application of the internal build-up weld 7, 8 in the piston rod 5 in the piston rod 5 in the manufacturing step indicated here.
  • an overlay weld 7, 8 is applied to the inside of the piston rod 5 in order to increase the wall thickness of the tubular workpiece from which the piston rod 5 is formed at the pipe ends.
  • the build-up welding is also shown in FIG. 6, which shows, by way of example, the end of the piston rod 5 on the rod head side in a sectional illustration.
  • the weld connection 6 can also be embedded in a correspondingly produced overlay weld 7 (FIG. 4) at the piston end, as can be seen from FIG.
  • FIG. 6 it can be seen how the wall thickness of the pipe 5, which is equipped with a constant wall cross section D, is increased on the inside at the pipe end by surfacing.
  • several layers, preferably as spiral-shaped beads 11, are applied to the inside of the pipe by means of build-up welding. The tube 5 is rotated and the welding electrode 25 is moved.
  • the machining post-processing of the build-up weld 8 is indicated in FIG.
  • a lathe chisel 26 the cross-section 10, which is reduced in the course of the piston rod away from the end piece 4, is worked out and the build-up weld 8 is smoothed in order to reduce the notch stress and optimize the force profile.
  • a weld pool retainer 24 can also be worked out for the welded connection 6 between the piston rod 5 and the end piece 3, 4.
  • a post-processing of the welded connection 6 after the connection of the end pieces 3, 4 to the piston rod 5 can thus be dispensed with.
  • Such a weld pool backup 24 also offers a simple possibility of positioning the end pieces 3, 4 on the piston rod 5, which simplifies the production of the piston rod unit 1 during welding.
  • the processed build-up weld 8 according to FIG. 7 emerges from FIG. 8, an unprocessed build-up weld 8 attached to the inside of the piston rod 5 being indicated, from which by means of machining Post-processing the visible build-up weld 8 with a smooth course and a weld pool backup 24 is worked out.
  • a processed build-up weld 8 according to FIG. 7 can also be seen in FIG. 9, with an unprocessed build-up weld 8 attached to the inside and on the front side of the piston rod 5, from which the visible build-up weld 8 with a smooth course and a weld pool retainer 24 is worked out by means of post-machining is.
  • the amount of material to be removed can be reduced, as indicated in FIG. 9, via the additional application of the build-up weld 8 on the end face of the piston rod 5, which makes the lowering position simpler and cheaper.
  • the end pieces 3, 4 can simply be positioned on the processed build-up welds 7, 8 for welding to the piston rod 5.
  • FIG. 10 shows the welding of the end piece 4 on the rod eye side to the piston rod 5.
  • a corresponding welded connection 6 is provided for connecting the piston rod 5 to the piston-side end piece 3.
  • the welded connection 6 is designed as a V-shaped fillet weld between the end piece 3, 4 and the piston rod 5, the weld root being embedded in the weld pool retainer 24, which is formed from the build-up weld 7, 8.
  • the notch effect stress is reduced by the exciting post-processing in the connection area reinforced by the overlay weld 7, 8.
  • the transition from the pipe 5 to the end piece 3, 4 with the weld pool retainer 24 could also be smoothed on the inside by machining, whereby the weight could be further reduced.
  • the smoothing of the weld root results in a welded joint that can withstand high loads due to the reduction of the notch effect in this area.
  • Chassis 19 Feed hopper

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

L'invention concerne un ensemble tige de piston (1) conçu pour un cylindre hydraulique (2), comprenant au moins une pièce d'extrémité (3) côté piston et au moins une pièce d'extrémité (4) côté lumière de tige, une tige de piston (5) conçue de manière creuse, disposée entre les pièces d'extrémité (3, 4), au moins une des pièces d'extrémité (3, 4) étant reliée à la tige de piston (5) par l'intermédiaire d'un assemblage par soudure (6), cet assemblage par soudure (6) étant noyé dans une soudure d'application (7, 8) appliquée côté interne sur la tige de piston (5) pour relier cette tige de piston (5) à la pièce d'extrémité (3, 4), ainsi qu'un cylindre hydraulique (2) comportant un tel ensemble tige de piston (1) et un mât articulé (12) d'une structure de manipulation de grandes dimensions (13) comprenant un tel cylindre hydraulique (2), ainsi qu'un procédé pour produire un ensemble tige de piston (1).
PCT/EP2020/072742 2019-08-14 2020-08-13 Ensemble tige de piston, cylindre hydraulique et mât articulé WO2021028528A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019121884.5 2019-08-14
DE102019121884.5A DE102019121884A1 (de) 2019-08-14 2019-08-14 Kolbenstangen-Einheit, Hydraulikzylinder und Knickmast

Publications (1)

Publication Number Publication Date
WO2021028528A1 true WO2021028528A1 (fr) 2021-02-18

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PCT/EP2020/072742 WO2021028528A1 (fr) 2019-08-14 2020-08-13 Ensemble tige de piston, cylindre hydraulique et mât articulé

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DE (1) DE102019121884A1 (fr)
WO (1) WO2021028528A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002103034A (ja) * 2000-10-03 2002-04-09 Dai Ichi High Frequency Co Ltd 内面焼入配管材
US20050166987A1 (en) * 2004-02-02 2005-08-04 Dai-Ichi High Frequency Co., Ltd. Clad pipe
EP1346157B1 (fr) 2000-12-22 2008-12-10 Schwing GmbH Dispositif dote d'au moins un bras d'extension ou d'appui pour fleches composees de type grue, mats distributeurs de beton et analogue
US20100040408A1 (en) * 2008-08-14 2010-02-18 Benteler Automobiltechnik Gmbh Connection between a tubular member of steel and a structure of aluminum
DE102013008351B3 (de) 2013-05-16 2014-06-12 Schwing Gmbh Bauteil mit mindestens zwei miteinanderer verschweißten Teilen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3841070A1 (de) * 1988-12-07 1990-06-13 Rhodia Ag Verfahren zur herstellung eines kettbaums sowie nach diesem verfahren hergestellter kettbaum
JP5394112B2 (ja) * 2009-04-06 2014-01-22 日立建機株式会社 シリンダ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002103034A (ja) * 2000-10-03 2002-04-09 Dai Ichi High Frequency Co Ltd 内面焼入配管材
EP1346157B1 (fr) 2000-12-22 2008-12-10 Schwing GmbH Dispositif dote d'au moins un bras d'extension ou d'appui pour fleches composees de type grue, mats distributeurs de beton et analogue
US20050166987A1 (en) * 2004-02-02 2005-08-04 Dai-Ichi High Frequency Co., Ltd. Clad pipe
US20100040408A1 (en) * 2008-08-14 2010-02-18 Benteler Automobiltechnik Gmbh Connection between a tubular member of steel and a structure of aluminum
DE102013008351B3 (de) 2013-05-16 2014-06-12 Schwing Gmbh Bauteil mit mindestens zwei miteinanderer verschweißten Teilen

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