EP0464356B1 - Vérin à piston plongeur - Google Patents

Vérin à piston plongeur Download PDF

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Publication number
EP0464356B1
EP0464356B1 EP91108401A EP91108401A EP0464356B1 EP 0464356 B1 EP0464356 B1 EP 0464356B1 EP 91108401 A EP91108401 A EP 91108401A EP 91108401 A EP91108401 A EP 91108401A EP 0464356 B1 EP0464356 B1 EP 0464356B1
Authority
EP
European Patent Office
Prior art keywords
plunger
cylinder
type cylinder
cylinder according
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.)
Expired - Lifetime
Application number
EP91108401A
Other languages
German (de)
English (en)
Other versions
EP0464356A1 (fr
Inventor
Hellmut Hurr
Hartmut Dr. 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 EP0464356A1 publication Critical patent/EP0464356A1/fr
Application granted granted Critical
Publication of EP0464356B1 publication Critical patent/EP0464356B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2838—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT with out using position sensors, e.g. by volume flow measurement or pump speed

Definitions

  • the invention relates to a plunger cylinder with a cylinder closed on the bottom side, which can be pressurized with hydraulic fluid, and with a plunger which protrudes from the cylinder on the opening side and is guided in guide, sealing and / or wiper rings arranged in annular recesses in the cylinder.
  • Plungers have a smooth, usually ground or hard chrome-plated jacket, which is guided in the packing from guide, sealing and / or wiper rings (FR-A-1125573, Fig. 1). This means that the surface treatment of the inner surface of the cylinder can be omitted.
  • the plunger cylinders are particularly suitable for high pressures and are used, for example, to drive pipe switches in thick matter pumps.
  • the plunger cylinders are usually actuated via hydraulic sequential controls, for the triggering of which signal taps that indicate the state of the units are required.
  • the pistons of which carry the sealing elements, such as piston rings and wiper rings it is known to provide hydraulic signal taps on the cylinder (US-A-3648568).
  • the object of the invention is to create a plunger cylinder which enables direct hydraulic signal tapping and can nevertheless be designed for high pressures and ensures adequate guidance of the plunger.
  • the fully hydraulic signal pickup according to the invention responds to the extended state of the plunger.
  • two plunger cylinders are accordingly provided which alternately emit an end signal.
  • the metal ring according to the invention is slotted and can therefore be inserted from the inside into the recess in the cylinder inner wall. In the inserted state, however, the slot edges designed as cut surfaces lie exactly against one another, so that only one hair groove remains.
  • the inner surface of the metal ring is ground cylindrical and is slightly above the Cylinder jacket inwards so that it forms a guide.
  • the metal ring therefore has both a sealing and a centering function.
  • the elastomeric O-ring arranged on the inside of the metal ring in the recess ensures that the metal ring on the plunger fits snugly on the outside and the joint between the two free metal ring ends is still zero.
  • the elastomeric sealing ring must be fitted in such a way that there is no noticeable springback when the control bores of the plunger are passed over, so that creeping of the pressure fluid and thus incorrect triggering are avoided.
  • the radially measured wall thickness of the metal ring is advantageously a multiple of the ring channel depth, while the axial extent of the metal ring is a multiple of its radially measured wall thickness. Furthermore, the wall thickness of the deposited elastomeric sealing ring should be a multiple of the radially measured wall thickness of the metal ring.
  • a slotted plastic sealing ring which forms a hair gap at its slit edges, is additionally arranged in a ring-shaped recess in the cylinder with an elastomeric sealing ring, at a distance from the bottom of the metallic guide and sealing ring.
  • the additional sealing ring ensures that the pressure is gradually reduced up to the signal tap area. While the metallic guide and sealing ring forms a kind of coarse seal, the fine seal takes place via the plastic sealing ring, for example made of PTFE.
  • the soft plastic seal adapts better to the plunger surface and therefore seals better than the metallic seal.
  • the metal seal ensures better guidance and less susceptibility to wear at the high flow velocities that occur there in the immediate pressure tap area.
  • the guide and sealing ring delimiting the ring groove on the opening side is not subject to the high mechanical stresses of the guide and sealing ring delimiting the bottom and can therefore consist, for example, of PTFE-filled with bronze or of textile tape impregnated with epoxy resin.
  • an axially elongated guide band is advantageously arranged at the bottom distance from the plastic guide and sealing ring, which can also consist of PTFE filled with bronze or of textile tape impregnated with epoxy resin.
  • the plunger has a cavity which is open at the bottom and a plurality of transverse bores which are arranged around the circumference and open into the cavity as control bores.
  • a short circuit is produced via these control bores when the ring channel arranged in the area of the signal tap is passed over and an amount of oil is released which triggers the switching signal.
  • connection piece for the pressure fluid is expediently arranged near the bottom end on the cylinder jacket.
  • the plunger with a bottom-side cylindrical cavity can be pushed onto a cylindrical damping pin projecting coaxially over the cylinder base while leaving an annular space free.
  • the cylindrical damping pin is provided with an end-side guide cone, while the cavity of the plunger can be flared towards the bottom end of the piston for the same reason.
  • the damping effect is essentially achieved by the fact that the damping pin has a small undersize of a few tenths of a mm, preferably 2/10 mm compared to the interior dimension of the plunger, while the cylinder has a small undersize of a few tenths of a mm, preferably approx / 10 mm compared to the outer dimension of the plunger.
  • the gaps formed in this way are sufficient to displace the pressure fluid in a dampened manner towards the connecting piece and to move the plunger sufficiently quickly when starting up to bring it out of the end position again.
  • the damping pin is provided in the area of its outer surface with ring grooves, via which an oil cushion with a centering effect can form.
  • a further advantageous embodiment of the invention provides that the plunger cylinder has a cross-sectional widening in the region of the connecting piece, which is delimited on the bottom side by a cone flank.
  • the bottom edge (damping edge) of the cone flank is expediently arranged behind the bottom edge (leading edge) of the guide cone. Due to the offset between the leading edge and the damping edge, pushing on and damping takes place in two stages.
  • the distance of the control bores from the bottom end of the piston is greater than the distance between the bottom side of the cone edges and the cylinder bottom.
  • the single figure shows a plunger cylinder with hydraulic signal pick-up in a longitudinal section.
  • the plunger cylinder essentially consists of a cylinder 12 closed on one side at its base 10 and a plunger 16, which is axially displaceable in the cylinder 12 and protrudes beyond the cylinder opening 14.
  • a ball 18 or 20 is formed on each of the free ends of the cylinder 12 and the plunger 16 and is used to suspend the plunger cylinder. Instead of the balls 18, 20, other joints can also be provided.
  • the plunger 16 has a smooth, preferably ground or hard-chromed cylindrical outer surface 22 and is provided with a cavity 24 which is open at the bottom.
  • the essentially cylindrical wall of the plunger formed in this way has a plurality of control bores 28, which are arranged in the circumferential direction and are designed as transverse bores, at a distance from the bottom end 26.
  • the cylinder 12 has two connecting pieces 32, 34 projecting beyond its lateral surface 30, of which the connecting piece 32 is designed as a connecting piece for the pressure fluid and the connecting piece 34 as a signal tap connection.
  • the connection piece 32 arranged near the floor opens into the cylinder interior via a wide transverse bore 36 and an annular channel 38, so that the plunger 16 can be acted upon with pressure fluid on the bottom side.
  • the signal tap connector 34 arranged in the vicinity of the cylinder opening 14 is connected to the cylinder interior via a narrow transverse bore 40 and an annular channel 42.
  • the inner surface of the cylinder has a plurality of annular groove-shaped recesses 44 to 54, which are intended for receiving guide, sealing and / or wiper rings 56 to 66.
  • the elastomeric rings 56, 58 arranged in the opening 44 on the opening side and in the enclosed groove 46 have both a stripping and a sealing function, while the relatively elongated guide bands 60, 66 arranged in the flat grooves 48 and 54 primarily serve as a guiding function for comes to the plunger.
  • the guide belts are preferably made of bronze-filled PTFE or an epoxy-impregnated textile belt.
  • the ring 62 deposited in the groove 50 with an elastomeric O-ring 63 is designed as a slotted metal ring which, together with the guide band 60, laterally delimits the ring channel 42.
  • the cut surfaces of the open metal ring 62 lie tightly against one another in the inserted state, forming a hair gap.
  • the metal ring which is precisely ground on the inside of the piston, ensures a wear-resistant piston guide and a leak-proof liquid seal. Nevertheless, the metal ring only has the function of a coarse seal.
  • the signal tap is sealed off via the plastic ring 64, which is supported in the groove 52 on an elastomeric O-ring 65.
  • a damping pin 68 projecting coaxially over the cylinder base is provided, which delimits a cylindrical annular space 70 for receiving the piston end near the base.
  • the gaps between the surface of the pin 68 and the adjacent cavity inner surface of the plunger 16 and between the plunger outer surface and the bottom cylinder inner surface are each about 2/10 mm, so that when the plunger is retracted pressure medium can be displaced to the nozzle in a damped manner and the plunger when it starts up can be removed from its end position sufficiently quickly.
  • the three ring grooves 71 on the damping pin 68 ensure a sufficient oil cushion in the narrow space and thus a good centering effect.
  • the damping pin 68 carries a guide cone 74 delimited by a guide edge 72.
  • the plunger 16 also has an inside cone 76 on its bottom end 26 on.
  • the annular channel 38 which is recessed in the cylinder wall in the area of the connecting piece 32 is conical at the bottom and delimited by a damping edge 78. The offset between the leading edge 72 of the damping pin 68 and the damping edge 78 ensures that the plunger is pushed on and damped in two stages during the retraction process.
  • control bores 28 are also arranged in the fully retracted state of the plunger 16 in the cross-sectional areas of the guide cone 74 and the ring channel 38, so that hydraulic fluid can flow from the connection side via the control bores 28 into the cavity 24 to accelerate the starting process.
  • the invention relates to a plunger cylinder, on the cylinder jacket 30 of which a hydraulic signal tapping piece 34 is arranged.
  • the signal tap is connected to the inside of the cylinder via a transverse bore 40.
  • the sealing ring 62 delimiting the flank at the bottom is designed as an open metal ring which is arranged in an annular recess 50 of the cylinder 12 which is deposited behind an elastomeric sealing ring 63.
  • the plunger piston 16 has a plurality of control bores which communicate with the bottom side of the cylinder interior and penetrate the piston jacket 22 at a distance from the bottom-side piston end 26 28 on which trigger a switching operation when the ring channel 42 is passed over via the signal tap.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Sealing Devices (AREA)
  • Actuator (AREA)

Claims (21)

  1. Vérin à piston plongeur, comprenant un cylindre (12) pouvant être alimenté en fluide sous pression du côté fond, et un piston plongeur (16) guidé dans des bagues de guidage, d'étanchéité et/ou de raclage (60; 62, 63) placées dans des encoches annulaires (48, 50), et dépassant du cylindre (12) du côté ouverture, caractérisé en ce qu'il comprend
    - une tubulure de prélèvement de signaux hydrauliques (34) montée sur le corps (30) du cylindre,
    - un alésage transversal (40) qui traverse le corps (30) du cylindre et relie la tubulure de prélèvement de signaux (34) à l'intérieur du cylindre,
    - un canal annulaire (42) disposé sur la face intérieure cylindrique de l'alésage (40), délimité sur son flanc du côté ouverture et du côté fond par respectivement une bague de guidage et/ou d'étanchéité (60, 62) en saillie par rapport à la surface intérieure du cylindre, la bague de guidage et d'étanchéité (62) délimitant le flanc du côté fond étant conformée en bague métallique ouverte et formant sur ses bords d'ouverture une fente capillaire qui est disposée dans une encoche (50) du cylindre (12) garnie d'une bague d'étanchéité élastomère (63), et
    - au moins un alésage de commande (28) prévu dans le piston plongeur (16), communiquant avec le côté fond de l'intérieur du cylindre et traversant le corps (22) du piston à distance de l'extrémité (26) du piston située du côté fond.
  2. Vérin à piston plongeur selon la revendication 1, caractérisé en ce que l'épaisseur de paroi de la bague métallique (62) mesurée dans le sens radial est égale à un multiple de la profondeur du canal annulaire (42).
  3. Vérin à piston plongeur selon l'une des revendications 1 ou 2, caractérisé en ce que l'extension axiale de la bague métallique (62) est égale à un multiple de son épaisseur de paroi mesurée dans le sens radial.
  4. Vérin à piston plongeur selon l'une des revendications 1 à 3, caractérisé en ce que l'épaisseur de paroi de la bague d'étanchéité élastomère (63) placée derrière est égale à un multiple de l'épaisseur de paroi de la bague métallique (62) mesurée dans le sens radial.
  5. Vérin à piston plongeur selon l'une des revendications 1 à 4, caractérisé en ce que, à distance de la bague de guidage et d'étanchéité (62) située du côté fond et délimitant la rainure annulaire (42) du côté fond, une bague d'étanchéité (64) en matière plastique est disposée dans une encoche (52) du cylindre (12) doublée d'une bague d'étanchéité élastomère (65).
  6. Vérin à piston plongeur selon la revendication 5, caractérisé en ce que la bague d'étanchéité (64) en matière plastique réalisée de préférence en PTFE est ouverte et forme sur ses arêtes d'ouverture une fente capillaire.
  7. Vérin à piston plongeur selon l'une des revendications 1 à 6, caractérisé en ce que la bague de guidage et/ou d'étanchéité (60) délimitant le canal annulaire (42) du côté ouverture est conformée en bande de guidage.
  8. Vérin à piston plongeur selon l'une des revendications 5 à 7, caractérisé en ce que, à distance de la bague d'étanchéité en matière plastique (64), du côté fond, est disposée une bande de guidage (66) annulaire à section axiale allongée.
  9. Vérin à piston plongeur selon l'une des revendications 7 ou 8, caractérisé en ce que la bande de guidage (60, 66) est constituée de PTFE chargé de bronze ou d'une bande textile imprégnée de résine époxy.
  10. Vérin à piston plongeur selon l'une des revendications 1 à 9, caractérisé en ce que la tubulure de prise de signaux (34) est disposée à proximité de l'extrémité (14) du cylindre située du côté ouverture.
  11. Vérin à piston plongeur selon l'une des revendications 1 à 10, caractérisé en ce que le piston plongeur (16) comporte une cavité (24) ouverte du côté fond, et que plusieurs alésages transversaux répartis sur la périphérie et débouchant dans la cavité (24) sont prévus comme alésages de commande (28).
  12. Vérin à piston plongeur selon l'une des revendications 1 à 11, caractérisé en ce qu'il comprend une tubulure de raccordement (32) prévue sur le corps (30) du cylindre, à proximité de l'extrémité (10) située du côté fond et pouvant être alimentée en fluide sous pression.
  13. Vérin à piston plongeur selon l'une des revendications 1 à 12, caractérisé en ce que le piston plongeur (16) peut être emboîté avec une cavité cylindrique (24) située du côté fond, sur un tourillon d'amortissement (68) cylindrique qui dépasse coaxialement du fond (10) du cylindre, en laissant subsister un volume annulaire (70).
  14. Vérin à piston plongeur selon la revendication 13, caractérisé en ce que le tourillon d'amortissement cylindrique (68) comprend un cône de guidage frontal (74).
  15. Vérin à piston plongeur selon l'une des revendications 13 ou 14, caractérisé en ce que la cavité (24) du piston plongeur (16) s'élargit de manière conique en direction de l'extrémité (26) du piston située du côté fond.
  16. Vérin à piston plongeur selon l'une des revendications 12 à 15, caractérisé en ce que le cylindre (12) présente, dans la région de la tubulure de raccordement (32), un élargissement de la section transversale qui forme un canal annulaire (38) et est délimité du côté fond par un flanc conique.
  17. Vérin à piston plongeur selon la revendication 16, caractérisé en ce que l'arête (arête d'amortissement 78) du flanc conique du côté fond est disposée derrière l'arête (arête de guidage 72) du cône de guidage (74).
  18. Vérin à piston plongeur selon la revendication 17, caractérisé en ce que la distance entre les alésages de commande (28) et l'extrémité (26) du piston du côté fond est plus grande que la distance entre les arêtes coniques (72, 78) situées du côté fond et le fond (10) du cylindre.
  19. Vérin à piston plongeur selon l'une des revendications 13 à 18, caractérisé en ce que le tourillon d'amortissement (68) présente au moins une rainure annulaire (71).
  20. Vérin à piston plongeur selon l'une des revendications 13 à 19, caractérisé en ce que le tourillon d'amortissement (68) présente un écart en moins de quelques dixièmes de mm, de préférence d'environ 2/10 mm, par rapport à la dimension intérieure de la cavité voisine (24) du piston plongeur (16).
  21. Vérin à piston plongeur selon l'une des revendications 13 à 20, caractérisé en ce que le cylindre (12) présente dans sa section près du fond, un excès de quelques dixièmes de mm, de préférence d'environ 2/10 mm, par rapport à la dimension extérieure du piston plongeur (16).
EP91108401A 1990-07-03 1991-05-24 Vérin à piston plongeur Expired - Lifetime EP0464356B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4021070 1990-07-03
DE4021070 1990-07-03

Publications (2)

Publication Number Publication Date
EP0464356A1 EP0464356A1 (fr) 1992-01-08
EP0464356B1 true EP0464356B1 (fr) 1993-04-28

Family

ID=6409523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108401A Expired - Lifetime EP0464356B1 (fr) 1990-07-03 1991-05-24 Vérin à piston plongeur

Country Status (3)

Country Link
EP (1) EP0464356B1 (fr)
DE (2) DE59100097D1 (fr)
ES (1) ES2042324T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11731062B2 (en) 2021-01-20 2023-08-22 Asahi Kasei Bioprocess America, Inc. Components that facilitate maintenance of chromatography and synthesis columns

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102913508A (zh) * 2012-11-18 2013-02-06 苏州蓝王机床工具科技有限公司 混凝土泵摆阀驱动油缸的结构
CN103821790A (zh) * 2013-11-29 2014-05-28 安徽凯信机电科技有限公司 一种带有缓冲机构的液压缸
CN104006023B (zh) * 2014-06-06 2016-03-02 徐州徐工液压件有限公司 一种利用间隙密封的柱塞缸
CN105156398A (zh) * 2015-08-25 2015-12-16 中国铝业股份有限公司 一种单作用柱塞式快速维修大型液压缸

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
BE568140A (fr) *
FR1125573A (fr) * 1955-05-03 1956-11-02 Materiel De Voirie Vérin hydraulique de construction simplifiée
FR1204041A (fr) * 1958-10-03 1960-01-22 Vérin hydraulique simplifié
US3648568A (en) * 1970-03-09 1972-03-14 Mosier Ind Inc Signal valve
DE2442731A1 (de) * 1974-09-06 1976-03-18 Bosch Gmbh Robert Arbeitszylinder
US4363261A (en) * 1980-09-10 1982-12-14 Equipment Company Of America Cylinder assembly and method of replacing seals and bearings
FR2544804A1 (fr) * 1983-04-20 1984-10-26 Lau Hansen Andre Perfectionnement au guidage des elements de verins telescopiques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11731062B2 (en) 2021-01-20 2023-08-22 Asahi Kasei Bioprocess America, Inc. Components that facilitate maintenance of chromatography and synthesis columns

Also Published As

Publication number Publication date
EP0464356A1 (fr) 1992-01-08
DE4119106A1 (de) 1992-01-09
DE59100097D1 (en) 1993-06-03
ES2042324T3 (es) 1993-12-01

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