EP3736453A1 - Zylinder mit stangenverrieglungsvorrichtung - Google Patents

Zylinder mit stangenverrieglungsvorrichtung Download PDF

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Publication number
EP3736453A1
EP3736453A1 EP20167221.9A EP20167221A EP3736453A1 EP 3736453 A1 EP3736453 A1 EP 3736453A1 EP 20167221 A EP20167221 A EP 20167221A EP 3736453 A1 EP3736453 A1 EP 3736453A1
Authority
EP
European Patent Office
Prior art keywords
rod
cylinder
lock piston
lock
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.)
Withdrawn
Application number
EP20167221.9A
Other languages
English (en)
French (fr)
Inventor
Pierluigi CHIARINI
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.)
Camozzi Automation SpA
Original Assignee
Camozzi Automation SpA
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 Camozzi Automation SpA filed Critical Camozzi Automation SpA
Publication of EP3736453A1 publication Critical patent/EP3736453A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/223—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which completely seals the main fluid outlet as the piston approaches its end position
    • 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
    • F15B2015/267—Manual locking or release

Definitions

  • the present invention relates to a pneumatically or hydraulically actuated cylinder provided with a rod-lock device.
  • the rod-lock is a mechanical device that is to be attached to a cylinder and makes it possible to lock the rod when the cylinder is not pressurized. In other words, when actuated, the rod-lock device opposes the sliding movement of the rod in the cylinder, blocking the stroke thereof.
  • Rod-locks are used when the rod, to which a static load is axially applied, needs to stay locked in a particular position along the stroke of said rod.
  • Examples of cylinders to which rod-locks are attached are lifting cylinders in freight elevators.
  • Rod-lock devices are already known that are attached to cylinders and consisting of a system of two opposite jaws which, under the action of suitably dimensioned springs, block the stroke of the rod.
  • pneumatically or hydraulically actuated rod-lock devices it is possible to position the rod at the end-of-stroke, or at intermediate points, irrespective of the level of pressure of the cylinder.
  • rod-lock devices currently available on the market are actuated by means of a pneumatic, or hydraulic, circuit, which is independent of the pressurization circuit for the front and/or rear chambers of the cylinder.
  • the rod-lock devices according to the prior art are devices that are attached to the front head of the cylinder after said cylinder has been produced. Therefore, these rod-lock devices are sold separately to the cylinder and are only attached to the front head when necessary.
  • the rod-lock device which is provided separately to the cylinder, is therefore an accessory that, in addition to an increase in the costs of the automation system, involves installation operations that require the plant to be stopped and specialized technicians to intervene.
  • the rod-lock devices are attached to the front of the head of the cylinder and therefore increase the overall axial dimensions of the cylinder.
  • the rod-lock devices are radially attached to a head, increasing the overall radial dimensions of the cylinder.
  • These radial rod-lock devices require the head to be provided for coupling to the rod-lock such that the rod-lock can then engage with the rod, or the head needs to be mechanically operated in order to allow the rod-lock to be fastened to the head such that the rod-lock is then able to engage with the rod and block the stroke thereof.
  • the object of the present invention is to propose a pneumatically or hydraulically actuated cylinder that is provided with a rod-lock device and is able to overcome the drawbacks discussed above with reference to the cylinders of the prior art.
  • 1; 100 indicates, as a whole, a pneumatically or hydraulically actuated cylinder according to the invention.
  • the cylinder 1; 100 is pneumatically or hydraulically actuated and comprises a cylinder liner 2 and a cylinder piston 5.
  • the cylinder liner 2 is delimited at the ends by a front head 3b and by a rear head 3a so as to form a cylinder chamber 4.
  • the cylinder piston 5 is provided with a rod 6, is housed in the cylinder chamber 4 and can be actuated by means of a control fluid so as to move in said cylinder chamber 4 along an axis of translation X.
  • the cylinder 1; 100 is provided with a rod-lock device 7 comprising a rod-lock piston 8 that extends between a first end 8a and a second end 8b.
  • the rod-lock piston 8 is slidingly housed in a fluid-tight manner in a rod-lock piston seat 9 made in one of either the front head 3b or rear head 3a.
  • the rod-lock piston seat 9 extends in a direction that is orthogonal with respect to the axis of translation X.
  • a rod engagement through-hole 10 is made in the rod-lock piston 8, through which the rod 6 passes.
  • the rod-lock piston 8 is translatable at least from an active position, in which the rod is axially locked, to an inactive position, in which the rod 6 can freely slide into the rod engagement hole 10.
  • the rod-lock piston seat 9 is in fluidic communication with the cylinder chamber 2 such that the control fluid acting on the rod-lock piston 8 causes, following the passage of the rod-lock piston 8 from the active position to the inactive position, the translational movement of the cylinder piston 5 in the cylinder chamber 4.
  • slotd means elliptical or generally oval and the term “oblong” means a shape that is defined by two semi-circumferences connected tangentially to one another by means of two rectilinear and parallel segments.
  • front and/or frontal together with their adverbs “at the front” and/or “to the front” mean the end of the cylinder that is proximal to the end where the rod leaves.
  • rear and its adverb “at the rear” mean the end of the cylinder that is distal from the end where the rod leaves.
  • Axial and “axially” mean the longitudinal extension direction of the cylinder, that is the direction defined by the axis of translation X of the rod.
  • transverse and the derivatives thereof mean a direction that is orthogonal to the axis of translation X of the rod, that is a direction that is orthogonal to the discharge and/or return stroke of the rod.
  • the rod-lock piston 8 is equipped with rod locking means 80 suitable to interact with corresponding counter-locking means 60.
  • the counter-locking means are made in at least one axial portion 66 of the rod 6 so as to lock the rod in at least one predetermined axial position.
  • the engagement between said locking means and said counter-locking means defines the active position in which the rod 6 is axially locked, while the disengagement between said locking means and said counter-locking means defines the inactive position.
  • the at least one axial portion 66 is made along the lateral surface 61 of the rod 6.
  • the rod engagement hole 10 is a slotted or oblong hole, which is delimited by a hole wall 82 from which at least one rod engagement portion 84 internally protrudes, said rod engagement portion 84 projecting from the inside of the hole wall 82 so as to form, together with the hole wall 82, a step 86 that defines the locking means 80.
  • the counter-locking means 60 comprise at least one lowered portion 62 of the rod 6 and said lowered portion defines a coupling undercut 62 suitable to be axially engaged by the step 86.
  • the axial engagement between the step and the coupling undercut defines the active axial locking position of the rod 6.
  • the lowered portion 62 is a portion of the rod 6 that has a smaller diameter than the diameter of the rod 6.
  • the rod-lock piston is made of a material having a low coefficient of friction, for example polyacetal resin.
  • the rod-lock device 7 is influenced elastically to remain in the active rod locking position.
  • the elastic element 72 is housed between a bottom wall 92 of the rod-lock piston seat 9 and the first end 8a of the rod-lock piston 8. Said elastic element 72 is suitable to act on the rod engagement portion 84 so as to cause the rod-lock piston 8 to move in a translational manner from the inactive position to the active position.
  • the elastic element is a coil spring.
  • the rod-lock piston 8 is provided with a tang 89 that protrudes from the front or rear head so as to be accessible from the outside in order to move the rod-lock piston from the active position to the inactive position.
  • a closing cap 74 is sealingly housed in the rod-lock piston seat 9 that, in cooperation with the second end 8b of the rod-lock piston 8, forms a rod-lock piston actuation chamber 76.
  • the pressurized control fluid is pumped into said rod-lock piston actuation chamber 76, which causes the rod-lock piston to move in a translational manner from the active axial locking position of the rod to the inactive position.
  • the closing cap 74 is held in the seat by a circlip.
  • a pneumatic supply hole 30; 300 that is in fluidic communication with the rod-lock piston actuation chamber 76 by means of a primary supply duct 31; 310 is made in the head of the piston in which the rock-lock piston 8 is housed.
  • the rod-lock piston actuation chamber 76 is, in turn, in fluidic communication with the cylinder chamber 4 by means of a secondary supply duct 32.
  • the pneumatic supply hole 30; 300 extends along a pneumatic hole axis Y in a direction that is orthogonal to the axis of translation X.
  • the primary supply duct 31 is inclined with respect to said pneumatic hole axis Y.
  • the secondary supply duct 32 is in fluidic communication with a shock absorber device 36 of the piston end-of-stroke.
  • the head in which the rod-lock piston is housed has a main portion that houses the rod-lock device and has an axial extension that is significantly smaller than a head of the cylinder, as described above and with reference to Fig. 1-5 .
  • an axial projection extends from the above-mentioned main portion that houses the rod-lock device, in which projection a pneumatic supply hole 300 is made.
  • a primary supply duct 310 extends horizontally from the supply hole 300 to the rod-lock piston actuation chamber 76.
  • the axis of the rod-lock piston seat 9, the axis of translation X and the pneumatic hole axis Y lie on the same imaginary plane.
  • the cylinder is a mechanical component that is axially symmetrical with respect to the axis of translation X and that it is substantially hollow
  • the cylinder liner 2 defines a cylinder chamber 4 that is delimited at its ends by the front 3b and rear 3a heads
  • the term "internal” and its derivatives are intended to mean the region of space that is surrounded by the cylinder liner.
  • the phrase "towards the inside” or the like is intended to mean a direction oriented towards or approaching the axis of translation X.
  • a recess 78 in which a portion of the elastic element 72 is housed is made, in the first end 8a.
  • a bottom hole 94 is made in the bottom wall 92, in which a tang 89 that protrudes from the first end 8a of the rod-lock piston 8 is slidingly received.
  • Said tang 89 comprises an end tang portion 89a that protrudes transversally from the front head 3b, or from the rear head 3a, with respect to the axis of translation X.
  • Actuation means 87 for moving the rod-lock device may engage the end tang portion 89a.
  • the actuation means 87 comprise a ring.
  • the tang 89 may protrude from a base wall of the recess 78 and at least part of the elastic element 72 may be housed in the recess 78 so as to receive the tang 89 in its interior.
  • the secondary supply duct 32 comprises a first arm 32a, which extends along a shock-absorbing seat axis Y' that is orthogonal to the axis of translation X, and a second arm 32b that intersects the first arm 32a and is parallel to said axis of translation X.
  • a shock-absorbing seat 34 is made in the first arm 32a, in which a shock absorber device 36 may be housed.
  • the cylinder piston 5 is slidingly housed in a fluid-tight manner in the cylinder chamber 4 and the cylinder chamber 4 is divided into a rear chamber 4a and into a front chamber 4b by means of said cylinder piston 5.
  • the cylinder functions as described below.
  • the control fluid is pumped into the rear chamber 4a (or front chamber 4b) so as to actuate the discharge stroke (or the return stroke) of the rod 6.
  • the rod may freely slide into the rod engagement hole 10 so as to keep the rod-lock piston 8 in the inactive position.
  • the rod-lock piston 8 can pass from the inactive position to the active position, in which rod locking means 80 engage with counter-locking means 60.
  • the engagement between the means 80 and the counter-locking means 60 is caused by at least partially decreasing the compressive force acting on the elastic element 72, which allows the locking means 80 to engage with the respective counter-locking means 60.
  • control fluid stops being pumped into the rear chamber 4a (or front chamber 4b) when the rod 6 is locked by the mutual engagement between the means 80 and counter-locking means 60.
  • control fluid may be pumped through a pneumatic supply hole 30; 300 so as to reach and fill the rod-lock piston actuation chamber 76.
  • the pumping fluid may bring about the compression of the elastic element 72, causing the disengagement of the locking means 80 from the counter-locking means 60, and move the rod-lock piston 8 back into the inactive position.
  • control fluid continues to be pumped such that the control fluid may reach the front chamber 4b (or rear chamber 4a) that is in fluidic communication with the rod-lock piston actuation chamber 76, and may actuate the return stroke (or discharge stroke) of the rod 6, keeping the rod-lock piston 8 in the inactive position.
  • the pneumatically or hydraulically actuated cylinder provided with the rod-lock device achieves the proposed object.
  • the same control fluid is used to move both the rod-lock piston and the rod.
  • the fluidic communication between the rod-lock piston seat and the cylinder chamber both allows the rod-lock piston to move from the active position to the inactive position and the cylinder piston to move in a translational manner in the cylinder chamber.
  • the overall dimensions of the cylinder provided with the rod-lock device are comparable to the overall axial and radial dimensions of a cylinder according to the prior art that does not comprise a rod-lock.
  • the rod-lock piston being centrally passed through by the rod, makes full use of the dimensions and the geometry of the head, without increasing the overall radial or axial dimensions of the head.
  • the rod-lock piston facilitates the sliding movement of the rod engagement portion in contact with the rod.
  • actuation means are provided for moving the rod-lock piston from the active position to the inactive position in the event that the circuit for pumping the control fluid fails or malfunctions.
  • the elastic element when the rod engagement portion reaches the lowered portion, the elastic element causes the radial engagement of the rod engagement portion in the lowered portion and the axial engagement of the step with the coupling undercut. In other words, the elastic element causes the translational movement from the inactive position to the active rod locking position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Lock And Its Accessories (AREA)
  • Fluid-Damping Devices (AREA)
EP20167221.9A 2019-05-06 2020-03-31 Zylinder mit stangenverrieglungsvorrichtung Withdrawn EP3736453A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000006566A IT201900006566A1 (it) 2019-05-06 2019-05-06 Cilindro con dispositivo bloccastelo

Publications (1)

Publication Number Publication Date
EP3736453A1 true EP3736453A1 (de) 2020-11-11

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EP20167221.9A Withdrawn EP3736453A1 (de) 2019-05-06 2020-03-31 Zylinder mit stangenverrieglungsvorrichtung

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EP (1) EP3736453A1 (de)
IT (1) IT201900006566A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100004592A1 (it) 2021-02-26 2022-08-26 Camozzi Automation S P A Cilindro con dispositivo bloccastelo

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932370A (en) * 1955-06-11 1960-04-12 Daimler Benz Ag Aerodynamic braking mechanism for motor vehicles
DE1751159A1 (de) * 1968-04-13 1971-04-22 Rudolf Geiger Praez S Dreh Und Pneumatische Lineareinheit
DE3735103A1 (de) * 1987-10-16 1989-04-27 Bosch Gmbh Robert Hydraulischer stellantrieb
DE202005018038U1 (de) * 2005-11-18 2006-01-12 Festo Ag & Co. Fluidbetätigter Arbeitszylinder mit Endlagenverriegelung
EP1669612A2 (de) * 2004-12-09 2006-06-14 Bosch Rexroth Teknik AB Linearzylindereinheit mit Verriegelung
DE102011015086B3 (de) * 2011-03-25 2012-08-16 Festo Ag & Co. Kg Antriebsvorrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932370A (en) * 1955-06-11 1960-04-12 Daimler Benz Ag Aerodynamic braking mechanism for motor vehicles
DE1751159A1 (de) * 1968-04-13 1971-04-22 Rudolf Geiger Praez S Dreh Und Pneumatische Lineareinheit
DE3735103A1 (de) * 1987-10-16 1989-04-27 Bosch Gmbh Robert Hydraulischer stellantrieb
EP1669612A2 (de) * 2004-12-09 2006-06-14 Bosch Rexroth Teknik AB Linearzylindereinheit mit Verriegelung
DE202005018038U1 (de) * 2005-11-18 2006-01-12 Festo Ag & Co. Fluidbetätigter Arbeitszylinder mit Endlagenverriegelung
DE102011015086B3 (de) * 2011-03-25 2012-08-16 Festo Ag & Co. Kg Antriebsvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100004592A1 (it) 2021-02-26 2022-08-26 Camozzi Automation S P A Cilindro con dispositivo bloccastelo

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Publication number Publication date
IT201900006566A1 (it) 2020-11-06

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