EP3741720A1 - Chariot elevateur - Google Patents

Chariot elevateur Download PDF

Info

Publication number
EP3741720A1
EP3741720A1 EP20175749.9A EP20175749A EP3741720A1 EP 3741720 A1 EP3741720 A1 EP 3741720A1 EP 20175749 A EP20175749 A EP 20175749A EP 3741720 A1 EP3741720 A1 EP 3741720A1
Authority
EP
European Patent Office
Prior art keywords
head body
chamber
hollow body
lift truck
actuator unit
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
EP20175749.9A
Other languages
German (de)
English (en)
Other versions
EP3741720B1 (fr
Inventor
Davide Massarenti
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.)
LTE Lift Truck Equipment SpA
Original Assignee
LTE Lift Truck Equipment 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 LTE Lift Truck Equipment SpA filed Critical LTE Lift Truck Equipment SpA
Publication of EP3741720A1 publication Critical patent/EP3741720A1/fr
Application granted granted Critical
Publication of EP3741720B1 publication Critical patent/EP3741720B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps
    • 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
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting output members

Definitions

  • the lift truck is equipped with an upright designed for lifting and lowering a load.
  • the upright comprises an actuator unit configured to move an element for supporting the load.
  • the actuator unit is in the form of a hydraulic cylinder, preferably of a single action type.
  • the hydraulic cylinder comprises a jacket which houses a piston, movable by translating inside it, which has a rod having an end positioned outside the jacket.
  • the piston divides the jacket into a first chamber and a second chamber.
  • the first chamber is configured to receive a liquid fluid, in particular lubricating oil
  • the second chamber is configured to receive a gaseous fluid, in particular air from the outside environment. More specifically, the escape of the rod from the jacket, and therefore the lifting of the supporting element of the load, is regulated by the flow of oil into the first chamber whilst the second chamber is emptied of the air drawn from the outside environment. On the other hand, the retraction of the rod in the jacket, which corresponds to the lowering of the supporting element of the load, is regulated by the emptying of oil from the first chamber whilst the second chamber fills with air drawn from the outside environment.
  • the hydraulic cylinder comprises a head element, or cover, for closing the second chamber.
  • the head element comprises one or more sealing elements and scraping elements configured to come into contact with the outer surface of the rod during its translation.
  • the head element comprises a filtering element positioned along a conduit for connecting the outside environment and the second chamber for the passage of the air.
  • the portion of the conduit which houses the filtering element extends along a direction parallel to the longitudinal axis of extension of the rod, that is, along a vertical direction, so the filtering element is positioned parallel to the rod of the hydraulic cylinder. More specifically, the filtering element leads out at the face of the head element where the rod comes out.
  • a lift truck which comprises an upright device comprising at least one actuator unit configured for moving a supporting element of a respective load from at least a first configuration to a second configuration, different in height from the first configuration, and vice versa.
  • the actuator unit comprises a plunger slidable in a hollow body, housing the plunger, in such a way as to define a first chamber, configured to receive a liquid fluid, and a second chamber in fluid communication with the outside environment.
  • the hollow body has a longitudinal axis of main extension positioned along a vertical direction.
  • the actuator unit comprises a head body of the hollow body, forming partly the second chamber, which has at least one conduit extending from a first opening, in fluid communication with the outside environment, to a second opening, in fluid communication with the second chamber.
  • the conduit of the head body has at least one portion for housing a filtering element.
  • the housing portion of the filtering element extends along a direction transversal, in particular at right angles, relative to the direction of the axis of the hollow body in such a way that the filtering element is positioned along a direction transversal, in particular at right angles, to the direction of the axis of the hollow body.
  • the current arrangement of the filtering element allows an easy maintenance using suitable tools, in particular by the expulsion of the filtering element to be replaced acting from the inside towards the outside.
  • the actuator unit 5 comprises a rod 13 connected to the plunger 6.
  • the rod has a relative outer surface 13b.
  • the rod 13 has at least one end portion 13a positioned outside the hollow body 7.
  • the rod 13 translates along the main direction of extension 7a of the hollow body 7 by movement of the plunger 6.
  • the introduction of the liquid fluid into the first chamber 8 makes it possible to translate the plunger 6 upwards, and consequently the rod 13, increasing the volume of the first chamber 8 and, consequently, reducing the volume of the second chamber 9 for the escape of the gaseous fluid, or air, contained therein.
  • the actuator unit 5 controls the movement of the supporting element 3 from the first configuration to the second configuration.
  • the escape of the liquid fluid from the first chamber 8 makes it possible to translate the plunger 6 downwards, and consequently the rod 13, reducing the volume of the first chamber 8 and, consequently, increasing the volume of the second chamber 9 for introducing the gaseous fluid, or air, inside it.
  • the actuator unit 5 controls the movement of the supporting element 3 from the second configuration to the first configuration.
  • the actuator unit 5 comprises a head body 14 of the hollow body 7, defining in part the second chamber 9.
  • the head body 14 has an outer lateral surface 14a and a top surface 14b.
  • the outer lateral surface 14a of the head body 14 extends about the main axis 7a of longitudinal extension of the hollow body 7.
  • the top surface 14b of the head body 14 is positioned transversal, in particular at right angles, to the lateral surface 14a.
  • the outer lateral surface 14a is contiguous with the lateral surface 7b of the hollow body 7.
  • the head body 14, in particular at its top surface 14b, has a through hole 24 in which the rod 13 slides during its translation.
  • the head body 14 comprises at least one scraping element 25 and a sealing element 26 configured to come into contact with the outer surface 13b of the rod 13.
  • the head body 14 has at least one conduit 15 which extends from a first opening 16, in fluid communication with the outside environment, to a second opening 17, in fluid communication with the second chamber 9.
  • the second opening 17 leads into the passageway 12 of the second chamber 9.
  • the conduit 15 of the head body 14 has at least one portion 27 for housing a filtering element 18.
  • the filtering element 18 is configured for filtering the gaseous fluid, or air, entering and leaving the second chamber 9.
  • the housing portion 27 of the filtering element 18 extends along a direction transversal, in particular at right angles, to the direction of the axis 7a of the hollow body 7.
  • the housing portion 27 of the filtering element 18 extends along a direction radial to the direction of the axis 7a of the hollow body 7. With reference to the top surface 14b of the head body 14 the housing portion 27 of the filtering element 18 extends parallel to it. In this way, the filtering element 18 is positioned along a direction transversal, in particular at right angles, to the direction of the axis 7a of the hollow body 7. In other words, the filtering element 18 is positioned along a direction radial to the direction of the axis 7a of the hollow body 7.
  • the current arrangement of the filtering element 18 allows an easy maintenance using suitable tools, in particular by the expulsion of the filtering element 18 to be replaced acting from the inside towards the outside.
  • the actuator unit 5 comprises an element 19 for protecting the first opening 16 of the conduit 15 of the head body 14.
  • the protective element 19 comprises a lateral portion 22 forming a screen for protecting the first opening 16 of the conduit 15 of the head body 14.
  • the lateral portion 22 has an inner surface 22a facing towards the lateral surface 14a of the head body 14.
  • the lateral portion 22 has an outer surface 22b facing towards the outside environment.
  • the lateral portion 22 of the protective element 19 is in the form of a solid of revolution about the main longitudinal axis 7a of extension.
  • the protective element 19 defines a physical barrier between the first opening 16 of the conduit 15 of the head body 14 and the outside environment in such a way as to prevent the entrance of contaminating substances which may wear the components of the actuator unit 5.
  • the protective element 19 and the head body 14 are configured to be coupled to each other.
  • the coupling between the protective element 19 and the head body 14 is a sealed coupling.
  • a sealing element 23 is positioned between the lateral portion 22 of the protective element 19 and the head body 14.
  • the lateral surface 14a of the head body 14 has a respective seat for housing the sealing element 23.
  • the sealing element 23 is interposed between the lateral surface 14a of the head body 14 and the inner surface 19a of the protective element 19.
  • the head body 14 has a recess 21, made on the lateral surface of the head body 14, configured for forming a hollow space 20 between the protective element 19 and the first opening 16 of the conduit 15.
  • the hollow space 20 between the head body 14 and the protective element 19 is in the form of an annular circular crown.
  • the recess 21 made on the lateral surface of the head body 14 is configured to define a gap 28 for passage of the gaseous fluid, or air of the outside environment, between the lateral surface 14a of the head body 14 and the lateral portion 22 of the protective element 19.
  • the hollow space 20 is in the form of a groove interposed between the lateral surface 14a of the head body 14 and the lateral portion 22 of the protective element 19.
  • the gap 28 allows the passage of the gaseous fluid, or ambient air, from the bottom upwards, if entering the second chamber 9, and from the top downwards, if flowing out from the second chamber 9.
  • the configuration of the protective element 19 and the arrangement of the filtering element 18 in the head body 14 advantageously allows air of the outside environment to be drawn without depositing dust, condensate or other potentially contaminating substances.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Actuator (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP20175749.9A 2019-05-24 2020-05-20 Chariot elevateur Active EP3741720B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000007212A IT201900007212A1 (it) 2019-05-24 2019-05-24 Carrello elevatore.

Publications (2)

Publication Number Publication Date
EP3741720A1 true EP3741720A1 (fr) 2020-11-25
EP3741720B1 EP3741720B1 (fr) 2022-03-23

Family

ID=68234055

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20175749.9A Active EP3741720B1 (fr) 2019-05-24 2020-05-20 Chariot elevateur

Country Status (2)

Country Link
EP (1) EP3741720B1 (fr)
IT (1) IT201900007212A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982001748A1 (fr) * 1980-11-10 1982-05-27 Reeves Jerry L Vanne de commande d'ecoulement sensible a la charge
CN104649198A (zh) * 2013-11-20 2015-05-27 无锡市明珠烤漆厂 一种叉车的倾斜油缸的密封过滤结构
CN106837917A (zh) * 2016-12-30 2017-06-13 河海大学常州校区 一种带内泄漏显示的单作用液压缸

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982001748A1 (fr) * 1980-11-10 1982-05-27 Reeves Jerry L Vanne de commande d'ecoulement sensible a la charge
CN104649198A (zh) * 2013-11-20 2015-05-27 无锡市明珠烤漆厂 一种叉车的倾斜油缸的密封过滤结构
CN106837917A (zh) * 2016-12-30 2017-06-13 河海大学常州校区 一种带内泄漏显示的单作用液压缸

Also Published As

Publication number Publication date
IT201900007212A1 (it) 2020-11-24
EP3741720B1 (fr) 2022-03-23

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