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WO2003046388A1 - Actionneur - Google Patents

Actionneur Download PDF

Info

Publication number
WO2003046388A1
WO2003046388A1 PCT/EP2002/013472 EP0213472W WO03046388A1 WO 2003046388 A1 WO2003046388 A1 WO 2003046388A1 EP 0213472 W EP0213472 W EP 0213472W WO 03046388 A1 WO03046388 A1 WO 03046388A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
shaft
piston shaft
cylinder
actuator according
Prior art date
Application number
PCT/EP2002/013472
Other languages
English (en)
Inventor
Eckhard Polman
Original Assignee
Eckhard Polman
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 Eckhard Polman filed Critical Eckhard Polman
Priority to AU2002358057A priority Critical patent/AU2002358057A1/en
Publication of WO2003046388A1 publication Critical patent/WO2003046388A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/18—Machines moving with multiple degrees of freedom

Definitions

  • the present invention relates to an actuator having a housing in which a driving shaft is accommodated provided with a through bore, which through bore serves as an actuated cylinder, at least one piston and a piston shaft extending axially in said through bore, said at least one piston and said piston shaft being rotatable together with said driving shaft.
  • Such actuators are known in the state of the art and are used for driving all kinds of devices, which devices are intended to perform besides a rotational movement also an axial movement for adjusting purposes. Therefore such devices are fixed to an end of said piston shaft projecting out of said shaft of the actuator, which piston shaft extends axially into a through bore in said shaft and is can be rotated together with said shaft. Thus said device can be rotated and displaced in axial direction together with the axially extending piston shaft. From DE-19647396 it is disclosed to use such an actuator as driving means of a measuring device of an underwater pelletizer. The measuring device is to be considered as the device to be used with the actuator according to the present invention. Furthermore, such actuators are for example used for setting transmission devices as well as for coupling or shaft exchangers.
  • a drawback of the known actuators is, that an accurate and stable position of the piston shaft in axial direction can not be maintained. It can happen that the axial position of the piston shaft in certain operation conditions, for example due to forces exerted in axial direction on said device, changes. These uncommon and undesired displacements result in an increased wear and damages to the device, as well as a reduced accuracy of the operations to be performed with said devi ce.
  • the actuator according to the invention is characterised in that said at least one piston and said piston shaft is movable back and forth in both directions within said through bore by actuating said cylinder. This allows an accurate positioning of the piston shaft relative to the driving shaft enabling the accurate operation of the actuator under various operating conditions.
  • the position of the piston shaft relative to the shaft is controllable, preferably using actuating and control means.
  • This improves the accurate operation of the actuator according to the invention as external influences on the position of the piston shaft, e.g. forces exerted in axial direction on said piston shaft, are now minimized and corrected.
  • This also reduces wear and inaccuracy of the actuator, extending its life span as furthermore an automatic correction of the position within the framework of the control is herewith obtained.
  • the actuated cylinder is a double-acting piston cylinder.
  • a cylinder with several pistons (multiple piston cylinder) is applicable.
  • the actuator according to the invention is provided with locking means interacting with the piston shaft, which locking means lock the axial position of the piston shaft relative to the shaft.
  • locking means interacting with the piston shaft, which locking means lock the axial position of the piston shaft relative to the shaft.
  • the force for locking the axial position of the piston shaft is approximately two till three times the displacement force of the cylinder, thus allowing an reliable locking of the piston shaft under all possible operating conditions.
  • the locking means comprise at least one ring-shaped element, which element at least partly surrounds the piston shaft, and which ring-shaped element interacts with the piston shaft by means of a pneumatic actuated lever, preferably a so called knee lever, for locking the piston shaft in a desired position relative to the shaft.
  • a pneumatic actuated lever preferably a so called knee lever
  • the ring shaped element is a ring surrounding the piston shaft, preferably a stainless ring.
  • the actuator is provided with measuring means for determining the position of the piston shaft, which measuring means are preferably adapted for determining the axial position of the piston shaft with an accuracy of one tenth of a millimetre.
  • measuring means are preferably adapted for determining the axial position of the piston shaft with an accuracy of one tenth of a millimetre.
  • the position of the piston shaft relative to the shaft is controllable, preferably using actuating and control means connected with the pneumatic cylinder, the locking means and the measuring means.
  • the piston shaft is preferably movable in both directions
  • the measuring means are provided integrally with the locking means, such that they are constructed as one unit.
  • Such a unit can easily be replaced, for example in the event of a malfunction. Accordingly, it is also without effort possible to adapt an ordinary actuator with the features according to the invention.
  • the measuring means are mounted on the actuator. In a further preferred embodiment of the invention the measuring means are mounted at an universal joint for the pneumatic supply of the cylinders and/or the locking means.
  • said measuring means comprise a magnet positioned on said piston shaft, which magnet is movable accommodated through one or more electromagnetic coils placed around said piston shaft.
  • LVDT-principle electro-magnetic induction
  • the actuator is used as driving means of a pelletizer, in particular an underwater pelletizer.
  • the actuator is used as driving means of a transmission setting device.
  • the actuator is used as driving means of a coupling- or a shaft exchanger.
  • the actuator can be an electro- or pneumatic motor, whereas the cylinder can be an pneumatic, hydraulic or electronic actuated cylinder.
  • Figure 1 a first embodiment of an actuator according to the invention
  • Figure 2 a second embodiment of an actuator according to the invention
  • FIG 3 a third embodiment of an actuator according to the invention
  • Figure 4 and 5 detailed views of another embodiments of an actuator according to the invention.
  • Figure 1 shows a partly open side view of a first embodiment of an actuator 1 according to the invention.
  • the actuator can be constructed as an electromotor, e.g. an AC electromotor or as an hydraulic or pneumatic motor.
  • the actuator has a housing la in which a driving shaft 2 is accommodated.
  • Said driving shaft 2 of the actuator 1 is provided with an axial through bore 7 with a significant cross section, in which a piston shaft 5 is accommodated.
  • the cross section of the axial through bore 7 corresponds with the cross section of the piston shaft 5.
  • the piston shaft 5 is mounted axially in a liquid tight manner in the through bore 7 and is made of stainless steel and projects with its free end 5a (left side in the drawing) out of the shaft 2. To this free end of the piston shaft 5 a desired device to be driven is mounted.
  • a cylinder 3 is present, wherein the cylinder wall 3a forming said cylinder 3 is connected to the driving shaft 2.
  • Said driving shaft 2 with the cylinder housing 3a is rotatable accommodated in said housing la by means of suitable ball bearings 13a and 13b.
  • a piston 4 is accommodated, which piston is connected or mounted to the piston shaft 5.
  • the piston shaft 5 as well as the piston 4 can be rotated together with the driving shaft 2, whereas the piston shaft 5 and the piston 4 furthermore can be displaced in axial direction through the shaft 2 due the actuation of the cylinder 3.
  • the piston 4 divides the cylinder 3 in two chambers 17a-17b, wherein each cylinder chamber 17a-17b is connected with supply line 10 or 12 respectively.
  • the piston 3 is connected via an universal joint 11 to supply lines 10 and 12 for supplying pressurised air or another pneumatic or hydraulic medium to the two chambers piston 4 for displacing the piston 4 within the cylinder 3 and thus the piston shaft 5 within the through bore 7 of the shaft 2.
  • the supply lines 10 and 12 of the universal joint 11 are connected to an actuating and control means (not shown) for actuating the cylinder 3 and for controlling the movements of the piston shaft 5 and piston 4 within the cylinder 3 and the shaft 2.
  • the actuation and displacement of the piston 4 within the cylinder 3 takes place by creating a pressure difference between the two cylinder chambers 17a-17b in order to displace the piston 4 and thus the piston shaft 2 in axial direction.
  • the actuation and control means (not shown) can be operated as a hydro-pneumatic control means in order to control the position of the piston shaft 5 relative to the driving shaft 2.
  • the position of the piston 4 within the cylinder 3 can be maintained by for example equalizing the pressure difference between both cylinder chambers 17a-17b by opening a valve between both supply lines 10-12.
  • FIG. 2 shows a partly open side view of an actuator 1, here an AC electromotor. Also in this embodiment the corresponding parts are denoted with the same reference numerals.
  • the driving shaft 2 of the actuator 1 is provided with an axial through bore 7 with a significant cross section.
  • the through bore 7 serves as a pneumatic actuated cylinder
  • a piston 4 and a piston shaft 5 is disposed.
  • the piston shaft 5 can be displaced in axial direction through the shaft 2 as well as rotated together with the shaft 2.
  • the cross section of the axial through bore 7 corresponds with the cross section of the piston 4 and the piston shaft 5 of the cylinder 3.
  • piston 4 can be displaced within the through bore 7 by applying pressure differences via said pneumatic or hydraulic supply lines 10-12 to the cylinder chambers present at both sides of the piston 4 within the through bore 7/cylinder 3.
  • the piston shaft 5 is mounted axially in a liquid tight manner in the through bore 7 and is made of stainless steel and projects with its free end (left side in the drawing) out of the shaft 2. To this free end of the piston shaft 5 a desired device to be driven is mounted. During operation the piston shaft 5 of the cylinder 3 moves over specific distances in and out the shaft 2 of the actuator 1, as shown in the drawings with the double arrow V.
  • Locking means 6 for locking or fixating the axial position of the piston shaft 5 relative to the shaft 2 are mounted near the other end of the piston shaft 5 (right side of the drawing).
  • the locking means are connected to the actuator and rotate with it during operation.
  • the locking means 6 comprise a ring 8 manufactured from steel, through which ring 8 the piston shaft 5 of the cylinder 3 is guided, and wherein the ring 8 can be urged against the piston shaft 5 of the cylinder 3 using a pneumatic actuated knee lever 9 in order to lock or fixate the piston shaft 5.
  • the fixation means 6 for supplying pressurised air or another pneumatic medium to the piston 4 for displacing the piston shaft 5 within the cylinder 3.
  • the supply for pressurised air 10 of the locking means 6 and the supply of pressurised air 12 of the universal joint 11 of the piston 4 of the cylinder 3 are connected to an actuating and control means (not shown), for actuating and controlling the movements of the piston shaft 5 and piston 4 within the cylinder 3 and the shaft 2 as well as the lever 9 of the locking means 6 in a predetermined manner, such that the force for locking the actual position of the piston shaft 5 will be two till three times larger as the friction force of the cylinder 3.
  • the position of the piston shaft 5 relative to the shaft 2 is obtained with an accuracy of one tenth of a millimetre using a measuring device 13 integrally mounted to the locking means 6, which position is passed as a further control value to the actuating and control means.
  • the axial position of the piston shaft 5 relative to the shaft 2 can be locked by the locking means 6 with an accuracy of one tenth of a millimetre using the driving and control means.
  • FIG. 3 a further embodiment of an actuator according to the invention is shown, which embodiment comprises a multiple-piston cylinder consisting of multiple pistons 4 mounted on the piston shaft 5, dividing the cylinder 3 in separate cylinder chambers.
  • FIG 4 a detail is shown of the free end 5a of the piston shaft 5 extending from the housing la of the actuator 1.
  • the free end 5a is provided with a coupling element 21, which coupling element 21 serves as a mounting element for a device to be actuated by the actuator.
  • the coupling element 21 is mounted in a fixed manner to the free end 5a of the piston shaft 5, e.g. by means of a press fit.
  • the coupling element 21 is also mounted with its flange 21a to the end 2a of the driving shaft 2 by means of several ball splines 20.
  • the ball splines 20 comprises several splines or grooves 20a-20c provided in the circumferential surface of the free end 2a of the shaft 2 respectively the inner circumferential surface 22 of the flange 21a of the coupling element 21. In said coinciding grooves or splines 20a-20c iron balls are placed.
  • the ball spline 20 ensures a rotational fixation of the piston shaft 5, the coupling element 21 and the driving shaft 2, whereas the ball spline also allows an axial displacement of the coupling element 21 (together with the device mounted to it) due to the actuation of the cylinder 3 and the displacement of the piston shaft 5.
  • the coupling element 20 can be regarded as an universal mounting tool for all kinds of devices, which have to be driven/actuated with the actuator according to the invention.
  • a further detail is shown in Figure 5 showing the measuring device mounted to the piston shaft 2.
  • the measuring device comprises a magnet 25 placed in the piston shaft 2a. Outside and adjacent to the piston shaft 2a measuring coils 25a-25b are placed, which measure the axial displacement of the piston shaft 2-2a by means of electro-magnetic induction. More in particular the measuring device uses the LVDT- principle.
  • the piston shaft 2a is only capable of axial displacement as the shaft 2a is connected with the actual piston shaft 2 by means of a ball bearing coupling 23a-23b.
  • the embodiments shown in the drawings serve only as an elucidation of the invention and does not limit the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Actuator (AREA)

Abstract

La présente invention concerne un actionneur (1) comprenant un boîtier (1a) dans lequel est logé un arbre d'entraînement (2) pourvu d'un alésage traversant (7), cet alésage traversant servant de cylindre actionné (3), au moins un piston (4) et une tige de piston (5) se prolongeant axialement dans ledit alésage traversant, ce piston et cette tige de piston pouvant tourner ensemble sous l'action de l'arbre d'entraînement. Sur la base de la technique antérieure, l'invention a pour objet un actionneur amélioré tel que décrit ci-dessus, cet actionneur permettant de supprimer les inconvénients mentionnés dans la description, d'où l'obtention d'un positionnement précis et stable de la tige de piston dans le sens axial. Comme solution technique, l'actionneur de l'invention se caractérise en ce que le piston et la tige de piston peuvent se déplacer en va-et-vient dans les deux sens à l'intérieur de l'alésage traversant par actionnement dudit cylindre. Cela permet un positionnement précis de la tige de piston par rapport à l'arbre d'entraînement, d'où un fonctionnement précis de l'actionneur dans de nombreuses conditions de fonctionnement.
PCT/EP2002/013472 2001-11-26 2002-11-26 Actionneur WO2003046388A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002358057A AU2002358057A1 (en) 2001-11-26 2002-11-26 Actuator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20119153.9 2001-11-26
DE20119153U DE20119153U1 (de) 2001-11-26 2001-11-26 Elektromotor

Publications (1)

Publication Number Publication Date
WO2003046388A1 true WO2003046388A1 (fr) 2003-06-05

Family

ID=7964403

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/013472 WO2003046388A1 (fr) 2001-11-26 2002-11-26 Actionneur

Country Status (3)

Country Link
AU (1) AU2002358057A1 (fr)
DE (1) DE20119153U1 (fr)
WO (1) WO2003046388A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005018907A1 (fr) * 2003-08-25 2005-03-03 Husky Injection Molding Systems Ltd. Ensemble d'entrainement de rotation et de translation d'un arbre
KR100732596B1 (ko) * 2006-02-24 2007-06-27 허스키 인젝션 몰딩 시스템즈 리미티드 축을 회전하고 이동하기 위한 구동 조립체
JP2007283777A (ja) * 2007-08-07 2007-11-01 Husky Injection Molding Syst Ltd 軸を回転及び並進させるための駆動アセンブリ
WO2009052639A2 (fr) * 2007-10-23 2009-04-30 Husky Injection Molding Systems Ltd. Pièce de cylindre de piston de rotor
SG155072A1 (en) * 2003-08-25 2009-09-30 Husky Injection Molding Drive assembly for rotating and translating a shaft
US8087919B2 (en) 2009-05-28 2012-01-03 Athena Automation Ltd. Injection unit for an injection molding machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119441A (en) * 1982-04-30 1983-11-16 Dowty Hydraulic Units Ltd Combined fluid-pressure- operable rotary and linear actuator
EP0103555A1 (fr) * 1982-08-20 1984-03-21 Atlas Copco Aktiebolag Dispositif de blocage d'un piston
JPS59194168A (ja) * 1983-04-18 1984-11-02 Fujitsu Ltd 同軸形複合シリンダ装置
US4665558A (en) * 1984-12-28 1987-05-12 Burke David W Fluid-operated, linear-rotary, robot-like, actuator
DE19647396A1 (de) * 1996-11-15 1998-05-20 Gala Kunststoff Und Kautschukm Messerkopfhalterung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4907491A (en) 1987-08-14 1990-03-13 Filip Stanislaw F Extended-travel actuator with clamps on rod and cylinder end for clamping central rod
DE4309027A1 (de) 1993-03-20 1994-09-22 Fichtel & Sachs Ag Stellzylinder
US6302249B1 (en) 1999-03-08 2001-10-16 Lord Corporation Linear-acting controllable pneumatic actuator and motion control apparatus including a field responsive medium and control method therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119441A (en) * 1982-04-30 1983-11-16 Dowty Hydraulic Units Ltd Combined fluid-pressure- operable rotary and linear actuator
EP0103555A1 (fr) * 1982-08-20 1984-03-21 Atlas Copco Aktiebolag Dispositif de blocage d'un piston
JPS59194168A (ja) * 1983-04-18 1984-11-02 Fujitsu Ltd 同軸形複合シリンダ装置
US4665558A (en) * 1984-12-28 1987-05-12 Burke David W Fluid-operated, linear-rotary, robot-like, actuator
DE19647396A1 (de) * 1996-11-15 1998-05-20 Gala Kunststoff Und Kautschukm Messerkopfhalterung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 060 (M - 364) 16 March 1985 (1985-03-16) *
SVESHNIKOV V K: "MATERIALS ON THE MECHANICAL ENGINEERING ENCYCLOPEDIC REFERENCE BOOK/SPECIAL-PURPOSE HYDRAULIC ASSEMBLY UNITS", RUSSIAN ENGINEERING RESEARCH, ALLERTON PRESS, NEW YORK, US, vol. 15, no. 11, 1995, pages 33 - 42, XP000627687, ISSN: 1068-798X *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005018907A1 (fr) * 2003-08-25 2005-03-03 Husky Injection Molding Systems Ltd. Ensemble d'entrainement de rotation et de translation d'un arbre
EP1813412A1 (fr) * 2003-08-25 2007-08-01 Husky Injection Molding Systems Ltd. Ensemble de commande pour faire pivoter et moduler un arbre
US7316553B2 (en) 2003-08-25 2008-01-08 Husky Injection Molding Systems Ltd. Drive assembly for rotating and translating a shaft
US7390185B2 (en) 2003-08-25 2008-06-24 Husky Injection Molding Systems Ltd. Drive assembly for rotating and translating a shaft
SG155072A1 (en) * 2003-08-25 2009-09-30 Husky Injection Molding Drive assembly for rotating and translating a shaft
KR100732596B1 (ko) * 2006-02-24 2007-06-27 허스키 인젝션 몰딩 시스템즈 리미티드 축을 회전하고 이동하기 위한 구동 조립체
JP2007283777A (ja) * 2007-08-07 2007-11-01 Husky Injection Molding Syst Ltd 軸を回転及び並進させるための駆動アセンブリ
JP4668961B2 (ja) * 2007-08-07 2011-04-13 ハスキー インジェクション モールディング システムズ リミテッド 軸を回転及び並進させるための駆動アセンブリ
WO2009052639A2 (fr) * 2007-10-23 2009-04-30 Husky Injection Molding Systems Ltd. Pièce de cylindre de piston de rotor
WO2009052639A3 (fr) * 2007-10-23 2009-06-11 Husky Injection Molding Pièce de cylindre de piston de rotor
US8087919B2 (en) 2009-05-28 2012-01-03 Athena Automation Ltd. Injection unit for an injection molding machine

Also Published As

Publication number Publication date
AU2002358057A1 (en) 2003-06-10
DE20119153U1 (de) 2002-02-14

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