EP0466718B1 - Druckmittelbetätigte einrichtung - Google Patents

Druckmittelbetätigte einrichtung Download PDF

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Publication number
EP0466718B1
EP0466718B1 EP90904773A EP90904773A EP0466718B1 EP 0466718 B1 EP0466718 B1 EP 0466718B1 EP 90904773 A EP90904773 A EP 90904773A EP 90904773 A EP90904773 A EP 90904773A EP 0466718 B1 EP0466718 B1 EP 0466718B1
Authority
EP
European Patent Office
Prior art keywords
pull rod
annular piston
piston
locking elements
face
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
EP90904773A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0466718A1 (de
Inventor
Klaus-Dieter Klement
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.)
CyTec Zylindertechnik GmbH
Original Assignee
CyTec Zylindertechnik 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 CyTec Zylindertechnik GmbH filed Critical CyTec Zylindertechnik GmbH
Publication of EP0466718A1 publication Critical patent/EP0466718A1/de
Application granted granted Critical
Publication of EP0466718B1 publication Critical patent/EP0466718B1/de
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
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions

Definitions

  • the invention relates to a pressure medium operated device.
  • the known device comprises a cylinder housing with a cylinder bottom.
  • a pull rod projects into the cylinder housing with one end, which is formed on the circumference with an annular channel.
  • This end is encompassed within the cylinder housing by an annular piston, against whose inner surface there are locking elements which, when the annular piston is moved in the direction of the pull rod by means of a flow medium, are guided inwards into the annular channel of the pull rod and hold the pull rod there.
  • This movement of the locking elements is supported by corresponding inclined surfaces on the ring piston and on the ring channel of the pull rod. In the locked position of the pull rod, no further movement of the pull rod is possible.
  • DE-A-2911 071 describes a locking device for piston rods of fluid-actuated cylinders in the end position, in which the piston rod can be inserted into a locking device.
  • the end of this The insertable piston rod is provided with an annular groove, in which locking elements engage in the locked state.
  • the locking elements are prevented from moving radially outwards in the locked state by a slide.
  • An axially acting support means for the locking elements ensures that the piston rod cannot be pulled out.
  • the locking device described is therefore a pure end position locking for a piston rod. Only when the slide in its unlocked position allows the locking elements to move radially again can the piston rod be pulled out.
  • the invention is based on the object of proposing a pressure-operated device with which it is possible to move a piston rod over a small distance even in the locking position.
  • this locking position can be changed further axially, namely by actuating the support means of a further (ring-shaped) piston between the pull rod and the cylinder housing.
  • the piston is axially displaceable in the direction of the cylinder base by means of a pressure medium.
  • a relative movement in the radial direction or with a radial component between the locking elements and the pull rod used does not take place, since in the locking position the locking elements bear against the outside against an annular piston which blocks a radial outward movement of the locking elements.
  • the axial movement is ensured in that the annular piston remains movable against the action of the pressure medium acting on it and is carried under surface pressure by the locking elements which themselves - as shown - are pressurized via the support means of the further piston.
  • the pull-in force of the pull rod is dependent on the pressure acting on the piston, which can be set as desired.
  • a major advantage of this design is that a short displacement path can be set precisely under the influence of a high force exerted by the pressure medium.
  • the pressure on the piston with its support means can be hydraulic or pneumatic. But it is also possible to use a toggle lever mechanism to move towards the cylinder bottom or against the locking elements and the annular piston.
  • the pull-in speed of the drawbar is almost independent of the load and only a function of the pressure set in each case.
  • the device according to the invention is designed in a structural unit with a pressure-actuated piston-cylinder unit arranged coaxially therewith, in which the piston has a piston rod on both sides, one of which exits to the outside and the other coaxially into the cylinder housing insertable pull rod, which is formed with an inclined surface extending outwards towards the free end, which forms a contact surface for receiving the radially movable locking elements.
  • a finished actuation system is made available, with which, if necessary, long strokes with greater speed and smaller forces can be mastered by the pressure-operated (e.g. compressed gas-operated) piston-cylinder unit, while in a certain end position the second piston rod (pull rod) is locked with the other components mentioned above and then is moved to the end position with a freely adjustable large force and precisely adjustable speed.
  • the pressure medium connection which is provided on the side of the piston of the piston-cylinder unit which carries the second piston rod (tie rod), is simultaneously connected to the rest of the pressure medium-operated device such that the pressure medium e.g. pressurized gas is directed to the front of the piston and pushes it into the unlocked position as soon as the piston-cylinder unit is pressurized accordingly.
  • the pressure medium e.g. pressurized gas
  • the piston-cylinder unit is shown with reference number 10.
  • a cylinder housing 12 with a cylinder base 14 at the left end can be seen.
  • a piston rod 16 projects into the right open end a tie rod 18 is attached.
  • the piston rod 16 is thus a component of the pull rod 18.
  • the piston rod 16 or pull rod 18 is guided via cylindrical elements 20, 22. Damping rings 24, 26 are arranged between the elements 20, 22 and the piston rod 16 or pull rod 18, which ensure that that the piston speed is automatically throttled in the vicinity of the end position and a hard impact of the piston is avoided.
  • a further piston (annular piston) 28 is arranged in the cylinder housing 12 in front of the element 22 coaxially with the pull rod 18.
  • the end of the piston 28 directed towards the cylinder base 14 is tubular.
  • the piston 28 is sealed on the outside in a conventional manner by means of seals which are not specified, but is arranged displaceably in the cylinder housing 12.
  • the front end faces of the tubular section are identified by 28a.
  • a mandrel 30 runs concentrically to the central longitudinal axis M in the left end section of the cylinder housing 12 and is against the cylinder base 14 under the preload of a spring 32.
  • the mandrel 30 - if there is no counterforce - is pressed to the right (in the direction of the pull rod 18) until it abuts a stop 36 with an inner collar 34.
  • the stop 36 is formed here by the head of a screw fastened in the cylinder base 14.
  • An annular piston 38 is arranged between the mandrel 30 and the cylinder housing 12 and can slide on the mandrel 30 and is sealed both against the cylinder housing 12 and against the cylinder surface of the mandrel 30.
  • the annular piston 38 is under the action of a compression spring 40, which is supported on the cylinder base 14.
  • the inner diameter of the annular piston 38 widens over an inclined surface 38a, an inner cylindrical surface 38b and an adjoining further inclined surface 38c, which has a truncated cone shape.
  • a number of locking elements 42 are supported by the cylindrical outer surface of the mandrel 30.
  • the locking elements 42 are designed as circular ring segments and bear with an outer inclined surface 42c on the inclined surface 38c of the annular piston 38.
  • the pull rod 18 is formed at its left end in the figure with an enlarged collar 46, and the pull rod 18 widens over an inclined surface 18a to the collar 46.
  • the front end face 18b of the pull rod 18 bears against the corresponding end face of the mandrel 30.
  • a compressed gas connection 48 is provided, via which the piston 16 'of the piston rod 16 can be pressurized with compressed gas.
  • Another compressed gas connection 50 is provided in the area of the element 22, it being possible for the piston rod 16 to be moved back in the opposite direction (in the figure: to the right) by means of the pressurized gas supplied here.
  • the pressurized gas can also flow through the space 52 between the pull rod 18 and the piston 28 and a sufficiently dimensionable gap between the circumferential surface of the collar 46 and the inner cylindrical surface of the piston 28 and the free spaces between the Locking elements 42 enter the free space 44 and thus act on the annular piston 38 so that it is driven back into the position shown in FIG. 1 against the action of the springs 40.
  • the further pressure medium connection 54 with which the front end face of the annular piston 28 can be acted upon, is of particular importance.
  • the pressure medium can be oil or gas; however, it is also possible to arrange a toggle lever mechanism at this point, by means of which the annular piston 28 is mechanically driven in the direction of the cylinder base 14.
  • the pressure medium acts against the action of springs 56, which hold the annular piston 28 under constant preload.
  • springs 56 instead of the springs 56, other pressure media, such as a fluid, could also be used.
  • FIG. 2 shows the device according to FIG. 1 after the compressed gas connection 48 has been actuated.
  • the piston rod 16 and with it the pull rod 18 have hereby been pressed in the direction of the cylinder base 14, to the extent that the locking elements 42 slide behind the collar 46 under the radial pressure of the annular piston 38 could.
  • the annular piston 38 has moved to the right under the action of the springs 40 and now engages around the locking elements 42 on its outer surface, which bear against the cylinder surface 38b. Movement of the locking elements 42 to the outside is no longer possible.
  • the power stroke can now take place with precisely controlled speed, force and defined length.
  • a film cutting knife attached to the free end of the piston rod 16 could be moved from the position shown in FIG. 1 to the position shown in FIG. 2 by the movement of the piston rod 16 in the starting position for the cut.
  • a cut must now be made at a controlled speed and with an exact stroke of a few tenths of a millimeter to a maximum of a few millimeters; this is done in that the pressure medium connection 54 (here: with pressure oil) is applied.
  • the piston 28 is pressed against the resistance of the springs 56 to the left in the direction of the cylinder bottom 14.
  • the speed at which the piston 28 moves depends on the amount of oil supplied and the oil pressure. Both can be regulated very precisely. Load fluctuations on the piston 28 which occur as reaction forces are only manifested in pressure fluctuations of the hydraulic medium supplied. Speed fluctuations of undesirable size do not occur.
  • This position can be maintained via a corresponding maintenance of the pressure via the pressure medium connection 54 until another position is desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Damping Devices (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP90904773A 1989-04-03 1990-04-01 Druckmittelbetätigte einrichtung Expired - Lifetime EP0466718B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8904055U DE8904055U1 (de) 1989-04-03 1989-04-03 Druckmittelbetätigte Einrichtung
DE8904055U 1989-04-03

Publications (2)

Publication Number Publication Date
EP0466718A1 EP0466718A1 (de) 1992-01-22
EP0466718B1 true EP0466718B1 (de) 1992-11-19

Family

ID=6837789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90904773A Expired - Lifetime EP0466718B1 (de) 1989-04-03 1990-04-01 Druckmittelbetätigte einrichtung

Country Status (5)

Country Link
EP (1) EP0466718B1 (da)
DE (3) DE8904055U1 (da)
DK (1) DK0466718T3 (da)
ES (1) ES2035750T3 (da)
WO (1) WO1990012213A1 (da)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109356909A (zh) * 2018-12-01 2019-02-19 江苏汉东机械有限公司 一种液压缸机械锁定装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2911071A1 (de) * 1979-03-21 1980-09-25 Andexer Rolf Fa Verriegelung fuer kolben von druckmittelzylindern
DE3317487A1 (de) * 1983-05-13 1984-11-15 Gabrie, Duje Welter, 5170 Jülich Zwangsverriegelungssystem fuer kolben von druckmittelzylindern
EP0219594A1 (de) * 1985-10-23 1987-04-29 Klement, Klaus-Dieter Druckmittelbetätigte Einrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397620A (en) * 1966-10-06 1968-08-20 Milwaukee Cylinder Corp Fluid actuator with annular piston locking means
US3813065A (en) * 1969-06-23 1974-05-28 Decoto Aircraft Inc Locking mechanisms and actuator assemblies of coaxial locked remotely at selected locations after motions of a nearly complete circumferential one piece chamfered locking ring
DE7426429U (de) * 1974-08-02 1974-12-19 Esser K Kg Mit einem Druckmedium beaufschlagbarer Arbeitszylinder
DE2906819C2 (de) * 1979-02-22 1983-05-26 EHP Hugo Krüger KG Elektrik-Hydraulik-Pneumatik, 5828 Ennepetal Druckgasbetätigbarer Doppel-Hubzylinder für insbesondere Lichtkuppeln
US4712471A (en) * 1986-08-29 1987-12-15 Ex-Cell-O Corporation Actuator locking mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2911071A1 (de) * 1979-03-21 1980-09-25 Andexer Rolf Fa Verriegelung fuer kolben von druckmittelzylindern
DE3317487A1 (de) * 1983-05-13 1984-11-15 Gabrie, Duje Welter, 5170 Jülich Zwangsverriegelungssystem fuer kolben von druckmittelzylindern
EP0219594A1 (de) * 1985-10-23 1987-04-29 Klement, Klaus-Dieter Druckmittelbetätigte Einrichtung

Also Published As

Publication number Publication date
DE4090549D2 (da) 1992-03-12
EP0466718A1 (de) 1992-01-22
DE8904055U1 (de) 1989-09-07
DK0466718T3 (da) 1993-04-05
WO1990012213A1 (de) 1990-10-18
ES2035750T3 (es) 1993-04-16
DE59000489D1 (de) 1992-12-24

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