EP3444213A1 - Ascenseur hydraulique - Google Patents

Ascenseur hydraulique Download PDF

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Publication number
EP3444213A1
EP3444213A1 EP17001403.9A EP17001403A EP3444213A1 EP 3444213 A1 EP3444213 A1 EP 3444213A1 EP 17001403 A EP17001403 A EP 17001403A EP 3444213 A1 EP3444213 A1 EP 3444213A1
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EP
European Patent Office
Prior art keywords
hydraulic
piston rod
valve
cylinder
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Withdrawn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
EP17001403.9A
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German (de)
English (en)
Inventor
Ferhat Celik
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.)
Blain Hydraulics GmbH
Original Assignee
Blain Hydraulics 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 Blain Hydraulics GmbH filed Critical Blain Hydraulics GmbH
Priority to EP17001403.9A priority Critical patent/EP3444213A1/fr
Publication of EP3444213A1 publication Critical patent/EP3444213A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
    • B66B11/04—Driving gear ; Details thereof, e.g. seals
    • B66B11/0423—Driving gear ; Details thereof, e.g. seals actuated pneumatically or hydraulically

Definitions

  • the invention relates to an elevator system, also called elevator, elevator or lift.
  • An elevator system is a system with which people or loads can be transported in a mobile cabin, in a car or on a platform in a vertical or oblique direction between two or more levels. In this case, there are usually fixed access points at which the car can enter or leave.
  • the cab In the traction sheave elevator, the cab is secured to one end of the support rope and the counterweight to the other end of the suspension rope.
  • the carrying cable is guided over a driven roller.
  • the support cable is not attached to this role, but it is held and moved by friction.
  • the length of the suspension ropes can almost can be varied as desired, so that this type of elevator is also suitable for high-rise buildings.
  • the engine room is usually located above the elevator shaft.
  • the cab is moved by one or more hydraulic pistons. These are usually installed vertically at the bottom of the elevator shaft. Hydraulic lifts are more suitable for smaller heads in the range up to about 15 to 25 meters.
  • Elevator systems are installations requiring monitoring in the sense of the Industrial Safety Ordinance. Therefore, lift systems must be checked at least every two years by an approved inspection body. Lifts are usually equipped with a safety system that can prevent deviations from normal operation, even if all suspension ropes (for cable lifts) should break. With hydraulic elevators, a pipe rupture protection is installed directly at the connection of the cylinder. This automatically stops the cabin of the elevator at an overspeed.
  • elevator systems are among the safest ways of passenger transport.
  • One of the greatest risks of injury is when the car is already moving, although the doors of the car are not yet (completely) closed. In this case, passengers may be injured.
  • a redundant safety system must exist that can preclude movement of the cabin with the doors open.
  • hydraulic elevators this is realized in the upward direction by an additional intermediate valve.
  • This intermediate valve is placed between the actual valve block and the hydraulic system.
  • the intermediate valve is fastened by means of two screw connections to the actual valve block and to the rest of the hydraulic system.
  • the present invention seeks to provide an improved hydraulic elevator with a redundant security system in which the security system can be mounted and maintained as compact as possible and economically favorable and has no pressure loss.
  • the hydraulic elevator according to the invention has an elevator car which can be moved in an elevator shaft, in particular vertically or obliquely.
  • the lowering of the elevator car is controlled by a hydraulic control block.
  • the hydraulic control block has a central control piston, through which the hydraulic control line can be opened or closed from the elevator car to a storage tank.
  • the central control spool When the central control spool is in its ON position, hydraulic fluid can flow from the elevator car into the storage tank through the hydraulic control line so that the elevator car moves down.
  • the central control piston is in its CLOSED position, no hydraulic fluid can flow through the hydraulic control line.
  • the elevator car will stop in this case.
  • the hydraulic control line can be opened more or less.
  • the hydraulic control block is in an OPEN position.
  • the position of the central control piston is controlled by a valve block.
  • the hydraulic control block has a first and a second piston rod, both of which extend through a central hydraulic chamber.
  • the position of the first piston rod is controlled by a first valve unit and the position of the second piston rod via a second valve unit.
  • the first and the second valve unit are arranged in a common valve block.
  • the central control piston can be held together by the pressure in this central hydraulic chamber and the second piston rod in its CLOSED position.
  • the second piston rod or the pressure in the central hydraulic chamber is sufficient to fix the central control piston in this CLOSED position.
  • the transfer of the central control piston in its ON position is only possible by an interaction of both measures.
  • the second piston rod can pass through its central hydraulic piston engaging end portion through the central hydraulic chamber.
  • the second piston rod is not regularly attached to the central control piston.
  • the free end region of the second piston rod can be mounted longitudinally displaceable in a second cylinder.
  • the position of the second piston rod can be controlled by the hydraulic fluid in an upper and a lower hydraulic chamber within the second cylinder.
  • hydraulic fluid can be transferred from the lower hydraulic chamber into the upper hydraulic chamber so that the second piston rod is retracted into the second cylinder. Since the second piston rod is not fixedly connected to the central control piston, a change in the position of the second piston rod does not necessarily cause an opening of the central control piston. As long as the first valve unit is not opened, the central control piston therefore remains in its original position. However, a transfer of the central control piston from the CLOSED position to the OPEN position is only possible if the second piston rod is moved and retracted into the second cylinder.
  • the second valve unit may preferably comprise a directional valve with two switching positions.
  • One of the two switching positions may be a flow path through which hydraulic fluid can be transferred from the lower hydraulic chamber into the upper hydraulic chamber. As a result, the second piston rod can be retracted into the second cylinder.
  • the other of the two switching positions of the directional control valve can separate the connection between the upper and the lower hydraulic chamber.
  • the first piston rod may be fastened with its one end region to the central control piston, while the other end region of the first piston rod may be mounted so as to be longitudinally displaceable in a first cylinder.
  • the one end region of the first piston rod to the central control piston, it can be ensured that the position of the first piston rod necessarily determines the position of the central control piston. Accordingly, a change in the position of the central control piston always causes a change in the position of the first piston rod.
  • the attachment of the end region of the first piston rod to the central control piston could be realized, for example, via a screw connection or a welded connection.
  • the attachment by means of a Spring can be realized.
  • a spring can be arranged in the interior of the first cylinder, through which the first piston rod is pressed against the central control piston.
  • the first piston rod and the central control piston are easily separable from each other in this way, which may be necessary for maintenance purposes, for example.
  • the spring may in this case engage the free end of the first piston rod. It would also be possible that the spring at least partially protrudes through the interior of the first piston rod and engages a corresponding Kragschulter in the interior of the first piston rod.
  • the spring may also protrude through the entire interior of the first piston rod and engage the inside of the attacking on the central control piston end portion.
  • the end portion of the first piston rod engaging the central control piston may pass through a central hydraulic chamber.
  • the first piston rod may have at least one opening in the area of this central hydraulic chamber.
  • a connection can arise from the central hydraulic chamber into the interior of the first piston rod and into the interior of the first cylinder.
  • the hydraulic fluid can thus flow from the central hydraulic chamber into the interior of the first piston rod and the interior of the first cylinder and back again.
  • the first cylinder may in turn have a line connection, through which a connection is provided via a hydraulic line from the interior of the first cylinder into the upper hydraulic chamber of the second cylinder.
  • the line connection of the first cylinder in the ON position of the central control piston can be at least partially closed by the first piston rod.
  • the central hydraulic chamber may be connected via a first hydraulic line to the upper hydraulic chamber of the second cylinder.
  • This first hydraulic line can be closed or released by the first valve unit.
  • the second hydraulic line between the line connection of the first cylinder and the upper hydraulic chamber of the second cylinder can also be closed or released by the first valve unit.
  • the first valve unit may preferably have a first and a second directional control valve.
  • the first hydraulic line can be closed or released by the first directional control valve.
  • the second hydraulic line can be closed or released by the second directional control valve.
  • the second hydraulic line can open behind the first directional control valve into the first hydraulic line.
  • the first and the second directional valve of the first valve unit may each comprise two switching positions.
  • One of the two switching positions can each be a flow path. If the first or the second directional control valve is in flow position, the first or the second hydraulic line can be released. The other of the two switching positions can close the first and the second hydraulic line, respectively.
  • the first and / or the second valve unit may be connected via at least one throttle valve to a storage tank.
  • a storage tank may be that tank into which the hydraulic fluid flowing through the hydraulic control line also flows when the central control piston is open.
  • the throttle valve may preferably have an adjustable cross section.
  • the at least one throttle valve may be integrated in a directional control valve.
  • one of the switching positions of the directional control valve may correspond to the throttle valve.
  • the connection to the tank could be disconnected.
  • Fig. 1 shows the schematic flow diagram of the hydraulic control block 10 of a hydraulic elevator.
  • the hydraulic cylinder assembly 10 has a central control piston 12 which in Fig. 1 is shown in its closed position 14. In this CLOSE position 14, the central control piston 12 closes the hydraulic control line 18 coming from the elevator car 16. Thus, no hydraulic fluid can flow off into a storage tank 20 through the hydraulic control line 18. The elevator car 16 can not therefore travel downhill.
  • the hydraulic control block 10 also has a first piston rod 30 and a second piston rod 50.
  • the central control piston 12 can only from its closed position 14 according to Fig. 1 in the OPEN position 22 for crawl according to Fig. 2 or in the OPEN position 24 for normal driving according to Fig. 3 be transferred when the second piston rod 50 and the first valve unit 60 allow this.
  • the first piston rod 30 engages with its one end region on the central control piston 12. With its free end region, the first piston rod 30 is mounted longitudinally displaceably in a first cylinder 32. The free end region of the first piston rod 30 extends through a central hydraulic chamber 34. In the free end region of the first piston rod 30, two openings 36 are provided in the present example case. Through these openings 36, hydraulic fluid from the central hydraulic chamber 34 in the Interior of the first piston rod 30 and also in the interior of the first cylinder 32 flow.
  • the central control piston 12 can thus be transferred from its closed position 14 to an open position 22, 24 only when the first piston rod 30 can be retracted into the first cylinder 32. Conversely, the central control piston is transferred from its open position 22, 24 back to the closed position 14 as soon as the first piston rod 30 is extended from the first cylinder 32.
  • a pipe connection 40 is present in the first cylinder.
  • the line connection 40 opens into a hydraulic intermediate line 42.
  • the line connection 40 is opened. If the first piston rod 30 is partially retracted into the first cylinder 32 (see Fig. 2 ), the first piston rod 30 covers this line connection 40 at least partially.
  • the central control piston 12 is in its ON position 24 according to Fig. 3 for the normal drive, the line connection 40 is completely covered by the first piston rod 30.
  • the second piston rod 50 also engages with its one end on the central control piston 12.
  • the second piston rod 50 extends with its acting on the central control piston 12 end portion through the central hydraulic chamber 34 therethrough.
  • the second piston rod 50 is not fixed to the central control piston 12. With its free end region, the second piston rod 50 is mounted longitudinally displaceably in a second cylinder 52.
  • the second cylinder 52 has an upper hydraulic chamber 54 and a lower hydraulic chamber 56.
  • the position of the second piston rod 50 is dependent on the amount of hydraulic fluid in these two hydraulic chambers 54, 56.
  • the movement of the hydraulic fluid in the hydraulic control block 10 is controlled by a first valve unit 60 and a second valve unit 62. Both valve units 60, 62 are arranged in a common valve block 64. This allows easy maintenance of the system.
  • the first valve unit 60 is provided in a first hydraulic line 70.
  • the central hydraulic chamber 34 can be connected to the upper hydraulic chamber 54 of the second cylinder 52.
  • the first valve unit 60 has a first directional control valve 72 and a second directional control valve 74. Both directional control valves 72, 74 each comprise two switching positions. One of the two switching positions each provides a flow path, while the other of the two switch positions the first hydraulic line 70 separates.
  • the interior of the first cylinder 32 is connected to the upper hydraulic chamber 54 of the second cylinder 52 by means of a second hydraulic line 76.
  • the second hydraulic line 76 opens into the first hydraulic line 70 between the first directional control valve 72 and the second directional control valve 74.
  • the second valve unit 62 has a directional valve 80, which also comprises two switching positions. One of the two switch positions provides a flow path, while the other of the two switch positions separates the line.
  • the directional control valve 80 is provided in a conduit 82 connecting the lower hydraulic chamber 56 of the second cylinder 52 to the upper hydraulic chamber 54 of the second cylinder 52. In the present example case, the first hydraulic line 70 and this line 82 merge into one another after the first valve unit 60 and the second valve unit 62.
  • a throttle valve 86 is present in a branching line 84.
  • the throttle valve 86 comprises two switch positions, one of which represents a throttle valve with adjustable cross-section. The other of the two switching positions separates the branching line 84.
  • This branching line 84 leads to a storage tank 88, so that hydraulic fluid can be discharged into the storage tank 88.
  • the directional control valve 86 is disposed in the valve block 64.
  • the storage tank 88 may be identical to the storage tank 20; However, it would also be possible to provide two different storage tanks 20, 88. In this case, the two different storage tanks can be connected to each other via a hydraulic line and a pump.
  • the central hydraulic chamber 34 and the lower hydraulic chamber 56 of the second cylinder 52 are also connected via a respective line 90, 92 with the hydraulic control line 18. While much of the hydraulic fluid is flowing over the hydraulic control line 18, a portion of the hydraulic fluid is used via the lines 90, 92 to control the position of the central control piston 12. Therefore, in each case a throttle valve 94, 96 is present in both lines 90, 92 in the present example case.
  • the throttle valve 94 in the present example case has an adjustable cross section, while the throttle valve 96 has a constant cross section.
  • the central control piston 12 is in its closed position 14.
  • the elevator car 16 does not move in this position.
  • the pressure in the central hydraulic chamber 34 and in the lower hydraulic chamber 56 of the second cylinder 52 remains high.
  • the first piston rod 30 can therefore not be retracted into the first cylinder 32 and the second piston rod 50 can not be retracted into the second cylinder 52.
  • the central control piston 12 remains in the closed position 14th
  • the first piston rod 30 Due to the decreasing pressure in the central hydraulic chamber, the first piston rod 30 is also partially retracted into the first cylinder 32 so that the central control piston 12 opens slightly (OPEN position 22).
  • the elevator car can thus travel downwards at reduced speed. Excess hydraulic fluid can be discharged in this case via the throttle valve of the directional control valve 80 in the tank 88.
  • hydraulic fluid can likewise be transferred from the lower hydraulic chamber 56 of the second cylinder 52 into the upper hydraulic chamber 54 of the second cylinder 52.
  • the pressure of the hydraulic fluid in the central hydraulic chamber 34 remains constantly high because no hydraulic fluid can flow out of the central hydraulic chamber 34.
  • the first piston rod 30 remains in its in Fig. 1 shown position, so that an opening of the central control piston 12 is not possible. As a result, no lowering movement of the elevator car 16 can take place.
  • both the directional control valve 80 of the second valve unit 62 and both directional control valves 72, 74 of the first valve unit 60 are brought into flow position (see FIG Fig. 3 )
  • the elevator car 16 can be lowered at maximum speed.
  • the central control piston 12 is in this case in its maximum open ON position 24.
  • the second piston rod 50 is actively retracted by hydraulic fluid via the directional control valve 80 through the line 82 from the lower hydraulic chamber 56 of the second cylinder 52 in the upper hydraulic chamber 54 of the second cylinder 52 is transferred.
  • hydraulic fluid can be transferred through the first hydraulic line 70 and the open directional valves 72, 74 of the first valve unit 60 into the upper hydraulic chamber 54 of the second cylinder 52.
  • hydraulic fluid can be transferred via the second hydraulic line 76 through the opened directional control valve 72 via the interior of the first cylinder 32 from the central hydraulic chamber 34 into the upper hydraulic chamber 54 of the second cylinder 52.
  • the pressure in the central hydraulic chamber 34 drops significantly, so that the first piston rod 30 is pushed by the central control piston 12 in the first cylinder 32.
  • the first piston rod 30 completely covers the line connection 40 of the first cylinder 32. Excess hydraulic fluid can be discharged via the throttle valve 86 into the storage tank 88.
  • the existing pressure in the lower hydraulic chamber 56 of the second cylinder 52 initially prevents further hydraulic fluid from being transferred from the central hydraulic chamber 34 into the upper hydraulic chamber 54 of the second cylinder 52 can.
  • the pressure in the lower hydraulic chamber 56 of the second cylinder 52 increases rapidly, as is constantly pressed by the line 92 at a lowering of the elevator car 16 new hydraulic fluid in the lower hydraulic chamber 56 of the second cylinder 52.
  • the second piston rod 50 is extended out of the second cylinder 52.
  • the central control piston 12 is thereby transferred from its open position 24 in its closed position 14.
  • Fig. 1 to 3 The flow chart shown is simplified. Thus, it would be possible, for example, to provide a manual control in addition to the illustrated valve units, via which the central control piston could also be retracted. Such a manual control may be useful to move the elevator car to the next scheduled breakpoint in case of failure and leave the persons in the cabin first. Subsequently, the fault can be remedied.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Types And Forms Of Lifts (AREA)
EP17001403.9A 2017-08-17 2017-08-17 Ascenseur hydraulique Withdrawn EP3444213A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17001403.9A EP3444213A1 (fr) 2017-08-17 2017-08-17 Ascenseur hydraulique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17001403.9A EP3444213A1 (fr) 2017-08-17 2017-08-17 Ascenseur hydraulique

Publications (1)

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EP3444213A1 true EP3444213A1 (fr) 2019-02-20

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EP17001403.9A Withdrawn EP3444213A1 (fr) 2017-08-17 2017-08-17 Ascenseur hydraulique

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4722143A1 (fr) 2024-10-07 2026-04-08 Blain Hydraulics GmbH Ascenseur hydraulique et soupape de commande hydraulique pour ascenseur hydraulique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2646294A1 (de) * 1976-10-14 1978-04-20 Haushahn C Gmbh Co Hydraulische antriebsvorrichtung fuer einen aufzug
DE3434014A1 (de) * 1984-09-15 1986-03-20 Beringer-Hydraulik GmbH, Neuheim, Zug Hydraulische steuerung
WO2002002974A2 (fr) * 2000-07-03 2002-01-10 Wittur Ag Unite soupape de commande pour un ascenseur hydraulique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2646294A1 (de) * 1976-10-14 1978-04-20 Haushahn C Gmbh Co Hydraulische antriebsvorrichtung fuer einen aufzug
DE3434014A1 (de) * 1984-09-15 1986-03-20 Beringer-Hydraulik GmbH, Neuheim, Zug Hydraulische steuerung
WO2002002974A2 (fr) * 2000-07-03 2002-01-10 Wittur Ag Unite soupape de commande pour un ascenseur hydraulique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4722143A1 (fr) 2024-10-07 2026-04-08 Blain Hydraulics GmbH Ascenseur hydraulique et soupape de commande hydraulique pour ascenseur hydraulique
WO2026077958A1 (fr) 2024-10-07 2026-04-16 Blain Hydraulics Gmbh Ascenseur hydraulique et soupape de commande hydraulique pour ascenseur hydraulique

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