WO2003013996A1

WO2003013996A1 - Hydraulic lift with the machine room incorporated into the hoist way

Info

Publication number: WO2003013996A1
Application number: PCT/GR2002/000042
Authority: WO
Inventors: Lazaros Asvestopoulos; Athanasios Mavromatidis
Original assignee: Kleemann Hellas Sa
Priority date: 2001-08-06
Filing date: 2002-07-25
Publication date: 2003-02-20
Also published as: GR1004019B

Abstract

A Hydraulic lift whose components do not require a separate place for the Machine room. This device consists of a power unit (12) incorporated inside the hoist way (9) and characterised in that the valve (13) placed on the lid of the power unit (16) can shift from its original position by means of a mechanism applicable outside the hoist way (15). Thus, the control panel (17) and the valve shift mechanism (15) can be placed inside one cabinet or more (18) at the landings of the lift. The application of the shift mechanism (15) enables the entry and exit of the valve (13) from the hoist way (9) when carrying out maintenance-monitoring works and when releasing trapped passengers.

Description

HYDRAULIC LIFT WITH THE MACHINE ROOM INCORPORATED INTO THE HOISTWAY

This invention refers to a Hydraulic Lift.

Conventional Hydraulic Lifts consist of a hydraulic mechanism, which ensures the vertical travel of the car on guides-rails following a pre-set travel. An electrical hoist way device consisting of an electronic control panel and safety devices ensure safe passenger transfer using suitable automation operations. In particular, the hydraulic mechanism that ensures the vertical travel of the car consists of a single acting hydraulic piston and a power unit. The power unit includes a metallic container consisting of the pump and the motor, which form a unit, and the block of valves, which controls the amount of oil passing towards the hydraulic piston during the upward travel and the amount of oil passing from the hydraulic piston towards the vessel during the downward travel. The block of valves is situated either inside or outside the container at a fixed position. The piston's travel, upwards or downwards, applies to a car sling. The car is firmly mounted on the car sling either by direct suspension of the sling from the hydraulic piston or indirectly through the wire ropes. The wire ropes, on the one end, suspend firmly from a special base on the pit and, on the other end, suspend the sling through a suspension beam, which is an integral part of the car sling, passing first though a diverted pulley situated at the top of the piston with a 2:1 suspension ratio.

The power unit and the control panel are placed at the machine room in any part of the building respectively. The oil supply to the piston is made through a hydraulic piping. Despite the fact that the machine room can be located at any part of the building, it should occupy a specific space providing thus an enclosed and protecting area for the above equipment. This further means that: a) The machine room must be located at a specific area in the building increasing thus the total construction cost and reducing the useful space of the building. b) Two areas are needed for lift operation (Hoist way and machine room). c) Lift maintenance will be time-consuming and complicated due to the distance between the hoist way and the machine room. d) Due to the distance between the machine room and the hoist way it is necessary to use a long piping for the supply-bleeding of the oil from the piston. Thus, installation and maintenance costs and pollution risks in case of failure of the rubber pipe in the area of the Machine room and the Hoist way may increase. e) In many cases the machine room is close to populated areas and causes noise pollution. f) The maintenance staff when performing the maintenance of the lift cannot have a full picture of the lift's operation from the machine room. It is very common, due to negligence of the maintenance staff, to carry out maintenance works while the public uses the lift, increasing thus safety problems. g) The suspension of the frame from only one suspension beam causes problems in its regular rolling along the guides-rails and, in some cases, safety problems are also created.

The present invention offers a solution to all the above problems.

This invention provides a hydraulic lift where the car moves inside the hoist way along guides-rails. It comprises a hydraulic piston and a power unit, which consists of a container that includes the motor and the pump unit and the block of valves placed on the container's lid. The power unit is placed inside the hoist way and the block of valves can shift by using a mechanism applied from the external side of the hoist way. In this way, maintenance, check tests and passenger rescue, applicable from the block of valves, may be carried out from a place outside the hoist way.

Consequently, by placing the power unit inside the hoist way it is no longer necessary to reserve a specific area for the machine room. The power unit can be placed at the bottom of the pit on a special base and at a specific height that will permit the shifting of the valve. Thus, the valve shifting mechanism can be applied outside the hoist way.

The valve shifting mechanism, the electrical equipment and control panel may be placed inside a cabinet. The cabinet may be properly placed at a landing stop so that the technician may have easy access to the automation panel and the block of valves in order to carry out regular checks and maintenance work without entering the hoist way.

According to a particular alternative of this Hydraulic lift, the lifting device is placed on the left or right landing door, the guides-rails are side acting as far as the depth of the hoist way is concerned. Thus, the space between the guide-rail and the landing stop door can be used for various purposes. The power unit is placed at that specific space fully exploiting the height of the hoist way's pit so that the vessel will contain the required amount of oil for the operation and selecting properly its dimensions and mainly its height. By using the above device the required dimensions of the hoist way are reduced saving building space. According to another alternative, the suspension of the frame is effected through 2 suspension beams using 2 diverting pulleys at the top of the piston. This device ensures better, safer and smoother travel of the car along the guides-rails.

According to another alternative, by means of electrical devices, the lift cannot used by the public and the car and hoist way controls are disabled, in the case that the valve has not returned to the original position of continuous operation, but remains at the check-maintenance position outside the hoist way. In this way, the public does not run the risk of using the lift during maintenance-check works. The application of the invention will develop according to the attached figures. Fig .1 shows the cross section of the hydraulic lift according to the application of the invention.

Fig.2 shows the horizontal section of the hoist way of the aforementioned lift. Fig.3 shows the cabinet with the automation panel and the shift lever of the block of valves.

Fig.4 and Fig.5 show the plan view of the container before and after the application of the Valve Shift Mechanism respectively. The above figures show a hydraulic lift consisting of a) guides-rails, which allow the vertical movement of the car along a specific travel, b) the piston (2) mounted on a hollow- type supporting bar of the piston (1), the suspension base (10) and c) the power unit (12) placed inside the hoist way on a supporting base (11).

The travel of the car (6) is driven by a 2:1 transmission ratio due to the suspension of the frame, (21) on which the car is placed (6), from wire ropes (4). The other end of the ropes connects with the suspension base (10). The wire ropes pass through a pair of pulleys (3) situated at the top of the piston (2). The suspension frame (21) suspends by means of 2 suspension beams on the left (22) and the right (23) of the pair of pulleys (3).

The power unit (12) during the upward travel of the car sends through the block of valves (13) the required amount of mineral oil (2) to achieve the vertical lifting of the car (6) between the landings of the hoist way (9) along a travel determined by the guides-rails (5). Mineral oil is supplied to the piston by means a high-pressure rubber pipe (14). The downward travel of the car (6) is ensured when the mineral oil controlled by the block of valves (13) returns to the power unit (12) through the rubber hydraulic piping.

The lid of this power unit (12) can move horizontally using a mechanism (15) and ensure the shift of the block of valves (13) from the normal operation position of the lift inside the hoist way (Fig.4) to the check, maintenance and passenger emergency release position (Fig.5) outside the hoist way. In particular, the Valve Shift Mechanism is placed inside a cabinet (18), which is next to a landing (Fig.3). The Valve Shift Mechanism through suitable safety devices does not permit the use of the lift by unauthorised people and disables push-button operation (20).

Fig.3 shows the valve shift lever (15) and the control panel (17), which along with the valve (13), controls the flow of the oil into the piston (2). The cabinet (18) can be found at one of the hoist way landings and is incorporated into the frame (19) of a landing door (8). The valve shift mechanism (15) and the panel (17) are accessed through a door with a lock (24) so that unauthorised people will have no access. The panel (17) can be found on the upper part of the cabinet

(18) and the mounting position of the valve shift mechanism (15) on the lower part. Thus, the control panel is separated from (17) the check and maintenance area of the valve (13) and it can be d ivided into various sub-units placed at the same cabinet and in others anywhere in the hoist way.

During normal operation of the lift, the passengers can call the lift using the operation panels in the car or on landings (20). These calls are recorded and processed by the control panel (17) .

Then the control panel activates the pump of the power unit (12) and the solenoids of the block of valves (1 3) during the upward travel or only the solenoids of the block of valves (13) during the downward travel through a suitable sequence and controls the regular function of all safety systems.

During check, maintenance and repair work, the technician has access to the control panel (17) and the block of valves (13) unlocking the cabinet door (1 9) and operating the Valve Shift Mechanism (15) until the block of valves ( 13) is revealed through the cabinet (18).

In addition , in case of an emergency, the technician can access easily the emergency release mechanism of the block of valves (13) in order to lower the car and evacuate the passengers that may be trapped inside the car (6). In the event of a power failure the above rescuing procedure will be activated automatically from the control panel ( 17) through a battery, which activates the suitable down solenoid in the block of valves (13). On the completion of check and maintenance works using the Valve Shift Mechanism (15) the valve ( 13) can return to the original position releasing the fu nction of lift controls (20) .

Claims

1. The Hydraulic Lift with the Machine room incorporated into the hoist way where the car (6) travels along the guides inside the hoist way (5) by means of a hydraulic mechanism. The hydraulic mechanism comprises a piston (2) and a power unit (12) consisting of the sub-unit of the container, the pump and the motor and the block of valves (13), characterised in that the block of valves (13) can shift from its original position through the application of a mechanism (15).

2. The Hydraulic Lift with the Machine room incorporated into the hoist way, as in Claim 1, characterised in that the power unit (12) is placed inside the hoist way (9).

3. The Hydraulic Lift with the Machine room incorporated into the hoist way, as in Claims 1 and 2 characterised in that the block of valves (13) can shift, by means of a shift mechanism (15), from the original position inside the hoist way (25) to the check, maintenance and passenger release position outside the hoist way (26).

4. The Hydraulic Lift with the Machine room incorporated into the hoist way, as in Claims 1, 2 and 3 characterised in that the mechanism shifting the valve (15) from its original position inside the hoist way (25) to the check position outside the hoist way (26) is applied outside the hoist way (9).

5. The Hydraulic Lift with the Machine room incorporated into the hoist way, according to any preceding claim, characterised in that the power unit (12) is installed on the left or on the right of the hoist way (9) as provided by the type of the door in a landing stop (8) and towards the side of the hoist way (9) where the door is (8).

6. The Hydraulic Lift with the Machine room incorporated into the hoist way, according to any preceding claim, characterised in that the suspension of the frame (21 ) is effected through the use of wire ropes (4) hanging from the two suspension bars (22) and (23) .

7. The Hydraulic Lift with the Machine room incorporated into the hoist way, according to any preceding claim, characterised in that the location of the shift mechanism ( 15) of the valve

(1 3) is in the cabinet (18) properly placed outside, inside or even partly outside the hoist way (9).

8. The Hydraulic Lift with the Machine room incorporated into the hoist way according to claim 7 characterised in that the cabinet contains the whole control system or a part of it

( 1 7) .

9. The Hydraulic Lift with the Machine room incorporated into the hoist way according to claims 7 and 8 characterised in that the above mentioned cabinet (18) is placed on the left or on the right of the door of a landing (8), according to the type of the door as an extension or as a part of the door frame of a landing (19) .

10. The Hydraulic Lift with the Machine room incorporated into the hoist way according to all the preceding claims characterised in that the location of the shift mechanism (15) of the valve (13) and the control panel (17) can divide into various sub-units and can be placed at various positions inside or outside the hoist way (9).