EP0464356A1 - Vérin à piston plongeur - Google Patents

Vérin à piston plongeur Download PDF

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Publication number
EP0464356A1
EP0464356A1 EP91108401A EP91108401A EP0464356A1 EP 0464356 A1 EP0464356 A1 EP 0464356A1 EP 91108401 A EP91108401 A EP 91108401A EP 91108401 A EP91108401 A EP 91108401A EP 0464356 A1 EP0464356 A1 EP 0464356A1
Authority
EP
European Patent Office
Prior art keywords
plunger
cylinder
cylinder according
sealing ring
guide
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
EP91108401A
Other languages
German (de)
English (en)
Other versions
EP0464356B1 (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 closed bottom, pressurized cylinder and a in arranged in annular recesses of the cylinder guide, sealing and / or wiper rings, on the opening side protruding plunger from the cylinder.
  • Plungers have a smooth, mostly ground or hard chrome-plated jacket, which is guided in the packing from guide, sealing and / or wiper rings. 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.
  • 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 cylindrically and protrudes slightly beyond the inside of the cylinder, so that it forms a guide.
  • the metal ring thus 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.
  • the metallic guide and sealing ring additionally a slotted plastic sealing ring forming a hair gap at its slot edges in an annular recess of the cylinder backed with an elastomer sealing ring.
  • the additional sealing ring ensures that the pressure is gradually reduced up to the signal tap area.
  • the metallic guide and sealing ring forms a kind of coarse seal
  • the fine seal is made using the plastic sealing ring, which is made of PTFE, for example.
  • 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, for example, consist 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 likewise 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 damped manner towards the connecting piece and to bring the plunger out of the end position sufficiently quickly when it starts up.
  • 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 between the control bores from the bottom end of the piston is greater than the distance between the bottom side 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 projects beyond the cylinder opening 14.
  • a ball 18 and 20 respectively molded on, which serves to suspend the plunger cylinder.
  • other joints can also be provided.
  • the plunger 16 has a smooth, preferably ground or hard chrome-plated cylindrical surface 22 and is with a provided cavity 24 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 tight 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 near-bottom cylinder inner surface are each about 2/10 mm, so that when the plunger is retracted, pressure medium can be dampened to the nozzle 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 on the end face a guide cone 74 delimited by a guide edge 72.
  • the plunger also has an overrun cone 76 on the inside at its bottom end 26 and an inside cone 76 on the bottom end 26.
  • 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 which delimits the flank on the bottom is designed as an open metal ring, the one being an elastomer Sealing ring 63 deposited annular recess 50 of the cylinder is arranged.
  • the plunger piston 16 has a plurality of communicating with the bottom side of the cylinder interior, at a distance from the bottom-side piston end 28, which trigger a switching process 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)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Actuator (AREA)
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 true EP0464356A1 (fr) 1992-01-08
EP0464356B1 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 (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
CN104006023A (zh) * 2014-06-06 2014-08-27 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

Families Citing this family (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

Citations (7)

* Cited by examiner, † Cited by third party
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
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 (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
CN104006023A (zh) * 2014-06-06 2014-08-27 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

Also Published As

Publication number Publication date
EP0464356B1 (fr) 1993-04-28
ES2042324T3 (es) 1993-12-01
DE4119106A1 (de) 1992-01-09
DE59100097D1 (en) 1993-06-03

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