EP3235770B1 - Method for retrofitting an elevator and corresponding elevator - Google Patents

Description

The invention describes a method for retrofitting an elevator, the elevator having a drive motor coupled to a first traction sheave and a second traction sheave, wherein the first traction sheave at least one connected to a cab and a counterweight first cable and the second traction sheave at least one with the cab and the or another counterweight connected second rope drives, wherein the first traction sheave and the second traction sheave are arranged on opposite sides of the drive motor and wherein the drive motor is replaced with another drive motor.

Such elevators driven by two traction sheaves driven by a drive motor therebetween are known in the art, for example from the US patent US 6,035,974 or the European patent EP 0 905 081 , already known.

Such an elevator is easy on the arrangement because it can be mounted directly above the elevator in the shaft. Especially easy is the Construction, if the traction sheaves are driven directly, ie without transmission. In this case, the drive motor has a continuous shaft on which the two traction sheaves are arranged.

However, this simple arrangement also has disadvantages. Although the brake can be performed as a simple disc brake, but then requires a sufficiently large shaft and a large inner diameter, whereby the drive is expensive. Other brakes are more expensive in principle. For the rotary encoder is then either an expensive hollow shaft encoder with a large diameter or the speed must be transferred to a transducer shaft, which is also expensive and expensive.

If the drive motor has to be replaced in such an elevator, it is usually necessary to install a suitable drive motor with comparable technology. This replacement drive is therefore also expensive and expensive.

Out US 2005/0217943 A1 For example, an elevator for large loads is known, wherein a carrier carries a drive unit and a traction sheave, while a second upper deflecting wheel is arranged on a separate roller support.

Out EP 1 676 807 A2 an elevator is disclosed according to the preamble of claim 1.

The object of the invention is therefore to provide an elevator with a cost-effective drive, which can also be used for retrofitting in existing lifts, and a method for retrofitting an elevator with such an elevator drive.

When retrofitting an elevator, the trick of the invention now is that at a position of the first traction sheave set up a traction sheave and with the another, drive motor is coupled and that at a position of the second traction sheave a non-driven deflection roller is set up.

The advantage now is that only one

Traction sheave is driven by the drive motor. The drive motor does not require a continuous shaft here. The shaft can therefore be dimensioned smaller. Furthermore, a cost-effective disc brake can be used, which can be arranged as usual on the non-driven side of the drive motor. Likewise, a simple and inexpensive speed sensor can be used.

In the method according to the invention, an existing elevator with two traction sheaves is replaced. The second traction sheave is then simply used as a pulley or replaced by a pulley. About the pulley a counterweight by means of a rope to the elevator car is connected. In this case, a separate counterweight can be used or a single counterweight connected to the first and the second rope.

The method according to the invention thus makes it possible to exchange an elevator drive with two driven traction sheaves by a simple, inexpensive elevator drive with only one driven traction sheave. The retrofitted drive motor is therefore much easier and cheaper to produce.

There must be sufficient friction between the rope and the traction sheave so that the cable is taken through the traction sheave when the elevator is moving and does not slip. In the previous elevators, therefore, two traction sheaves were used, whereby the friction between the rope and traction sheave was increased overall to a sufficient extent. The friction can also be influenced by the geometry of the grooves in the traction sheaves.

Sometimes, therefore, the retrofitted drive motor with only a traction sheave the friction will not be big enough.

The friction between the rope and the traction sheave can for example be increased by mechanical means on the traction sheave. For example, the grooves can be designed as V-grooves.

In an expedient embodiment of the invention, it is provided that a plastic coating is present between a steel core of the at least one first cable and the traction sheave. This plastic layer increases the coefficient of friction between the traction sheave and the rope, so that the friction of one traction sheave is in any case sufficient to move the elevator.

The plastic layer may be formed, for example, as a cable sheathing and / or as a traction sheave.

If such a plastic layer is not already present, it can also be retrofitted.

An expedient development of the invention therefore provides that a plastic coating is retrofitted between a steel core of the at least one first cable and the first traction sheave, in particular as a cable sheathing and / or as a traction sheave support.

The drive motor and / or the traction sheave may be mounted on or on an existing or a retrofitted frame. Preferably, the deflection roller is also mounted on one of these frames.

In principle, in the method according to the invention existing elevator are not or only slightly changed. This means that components and components such as ropes, counterweights or the elevator car can remain unchanged. As a result, the cost of retrofitting is very much minimized thereby reducing the retrofit time and associated with the downtime of the elevator. And ultimately the costs go down.

Since the pulley does not need to be driven, its location on the elevator is not critical. In an advantageous embodiment of the invention, a rotation axis of the deflection roller is aligned with a rotational axis of the traction sheave. Such an arrangement is particularly inexpensive and easy to retrofit existing elevators with two traction sheaves.

Also in retrofitting, it is useful if the pulley is located above the cab.

An advantageous embodiment of the invention provides that the at least one first cable and the at least one second cable are secured to opposite ends of the driving cab. This installation situation is usually present, which is why this arrangement is particularly cost effective and efficient.

A further development of the invention provides that the at least one first cable and / or the at least one second cable is / are guided in corners of a booth shaft. By guiding the ropes in the corners, all four sides of the elevator are accessible. This arrangement is therefore particularly advantageous for panoramic elevators with glass walls or windows or elevators with doors on all sides.

The drive motor can via a gear with the traction sheave be connected. An advantageous embodiment of the invention, however, provides that the first traction sheave is coupled directly, so gearless, with the drive motor. This makes the drive easy and inexpensive. The missing gear also ensures a lower error rate.

As a drive motor, different types of electric motors can be used. It is particularly useful if an internal rotor motor is used as the drive motor. In principle, it is advantageous if the drive motor, regardless of its design, is provided with a brake on a side which is preferably remote from the first traction sheave.

In addition to the method of retrofitting an existing elevator, an application of the invention also includes an elevator having a drive motor coupled to a traction sheave that drives at least one first cable connected to a cab and a counterweight. This elevator is characterized in that a non-driven deflection roller is provided, which leads at least one connected to the driving cab and the or a further counterweight second rope.

Such an elevator has the advantage that the drive motor is designed only on one side and thus requires less space in an elevator shaft. At the same time the drive motor is much easier and cheaper, as already explained above.

The drive motor, the traction sheave and the deflection roller can be arranged freely in the elevator shaft, depending on the spatial conditions.

It is particularly expedient if the traction sheave, the guide roller and the drive motor are mounted on a common frame. As a result, the installation is simplified, in particular so possibly a pre-assembly of the components outside the elevator shaft is possible.

The traction sheave and the deflection roller preferably have mutually aligned axes of rotation. This arrangement is particularly easy to implement and usually requires no rope deflections.

In an expedient embodiment of the invention, the traction sheave and the deflection roller are arranged above the driving cab. As a result, a straight cable guide without deflections is particularly easy to achieve.

In particular, it is also expedient if the at least one first cable and the at least one second cable engage at mutually opposite ends of the driving cab. The cab is thereby guided straight and not tilted in the elevator shaft.

It is also possible that the at least one first cable and / or the at least one second cable is guided in corners of a car shaft / are. In this case, the sides of the cab are free, so that all sides windows or doors could be present.

In particular, the elevator according to the invention is designed as a panoramic elevator in which at least three, preferably all four sides have windows or consist entirely of glass. It is also possible that the floor and the ceiling are made of glass or have windows.

In an advantageous embodiment of the invention, the traction sheave is directly, in particular gearless, coupled to the drive motor. In this way, the drive motor is inexpensive to produce and low maintenance operable.

The drive motor may be expediently designed as an internal rotor motor, as this makes the design is quite compact.

The elevator has a brake that prevents the cab from falling down the shaft. Such a brake may for example be designed as a rope brake or arranged on the engine.

A preferred embodiment of the invention provides that the drive motor has a brake. Conveniently, the brake on the non-driven side, that is arranged on the side facing away from the traction sheave, the drive motor.

The ropes can be adjusted as required depending on the application. The diameter and the tensile strength depend significantly on the nominal weight of the cab and the acceleration of the elevator.

It is particularly expedient if the at least one first cable and / or the at least one second cable has a round or a flat cross-section. This simplifies the guidance on the traction sheave.

It is particularly expedient if the at least one first cable and / or the at least one second cable have matching cross sections. In this way an equal load capacity of the two ropes and a parallel guidance of the cab is guaranteed.

It is also expedient if the at least one first cable and / or the at least one second cable each have / have a cross-section which is constant in a longitudinal direction.

In order to increase the friction between the rope and the traction sheave and thus the driving ability, it may be expedient if a plastic coating is formed between a steel core of the at least one first cable and the traction sheave.

This plastic coating may be formed in particular as a cable sheathing and / or as a traction sheave. Whereby, in the case of the cable sheathing, the cable can be coated or completely encased, at least on the side lying on the traction sheave. For large pitches, it may be easier to coat the traction sheave, as this is less expensive.

The invention is explained below with reference to a preferred embodiment with reference to the accompanying drawings.

Fig. 1:

eine schematische Ansicht eines Aufzugs mit zwei angetriebenen Treibscheiben gemäß dem Stand der Technik,

Fig. 2:

eine schematische Ansicht eines erfindungsgemäßen Aufzugs mit einer angetriebenen Treibscheibe und einer Umlenkrolle

Fig. 3:

eine Vorderansicht eines erfindungsgemäßen Aufzugsantriebs,

Fig. 4:

eine Ansicht des Aufzugsantriebs der Fig. 3 von oben,

Fig. 5:

eine Seitenansicht des Aufzugsantriebs der Fig. 3 auf die Treibscheibe und

Fig. 6:

eine Seitenansicht des Aufzugsantriebs der Fig. 3 auf die Umlenkrolle.

It shows:

Fig. 1:

a schematic view of an elevator with two driven traction sheaves according to the prior art,

Fig. 2:

a schematic view of an elevator according to the invention with a driven traction sheave and a pulley

3:

a front view of an elevator drive according to the invention,

4:

a view of the elevator drive the Fig. 3 from above,

Fig. 5:

a side view of the elevator drive the Fig. 3 on the traction sheave and

Fig. 6:

a side view of the elevator drive the Fig. 3 on the pulley.

In Fig. 1 schematically a lift 1 according to the prior art is shown. The elevator 1 has a driving cab 2 for receiving persons and / or loads. Above the driving cab 2, an elevator drive 3 is arranged on a frame 4. The elevator drive 3 has a drive motor 5, which is arranged approximately centrally above the cab 2. The drive motor 5 has a continuous shaft 6, which is led out of the drive motor 5 on both sides. On a first shaft end, a first traction sheave 7 and on a second shaft end, a second traction sheave 7 'is arranged. The drive motor 5 is therefore arranged between the traction sheaves 7, 7 'and drives them directly, ie without gear.

The two traction sheaves 7, 7 'sit on both sides at opposite ends or sides of the cab 2, on each of which a counterweight 8 is arranged.

A first cable 9 is guided over the first traction sheave 7 and connects the equilateral end of the cab 2 with the equilateral counterweight 8.

A second cable 12 is guided over the second traction sheave 7 'and also connects the equilateral end of the cab 2 with the equilateral counterweight 8. The ropes 9, 12 are shown only symbolically. In fact, two or more cables are arranged on each traction sheave 7, 7 '.

In Fig. 2 Now, an elevator 1 according to the invention is shown, which essentially corresponds to the elevator 1 of FIG Fig. 1 equivalent. The drive motor 5 of the elevator drive 3 has in this embodiment a unilateral shaft 6. He drives a traction sheave 7, which is also arranged here at one end or a side of the cab 2. At the other end of the cab, however, a non-driven pulley 10 is arranged here, which is rotatably mounted on an additional bearing 11. About the guide roller 10, the second cable 12 is guided, which is connected to the cab 2 and a counterweight 8.

This arrangement according to the invention is much easier and cheaper than a two-sided drive due to the one-sided drive.

In addition, the drive according to the invention in an elevator 1 according to the Fig. 1 be retrofitted, for example in the course of a necessary maintenance or repair of the drive. Thus, in existing elevators an expensive drive motor can be replaced by a simple and inexpensive drive motor.

The Fig. 3 and 4 show an elevator drive according to the invention 3. The elevator drive 3 has a frame 4, which consists essentially of two parallel beams 13th is formed, which span the width of a cab 2 or a hoistway. The carriers 13 are connected to one another by a plurality of transverse struts 14.

At one end of the frame, a traction sheave 7 is arranged, which is mounted directly on the shaft 6 of a drive motor 5. The drive is therefore directly, without gear. The traction sheave 7 has four grooves in the example in which four parallel first cables 9 are guided. The first ropes 9 are each attached in a 1: 1 version at one end of the cab 2 and on a counterweight 8 ( Fig. 5 ).

The number of ropes depends on several factors and can be varied depending on the application. The invention is therefore not limited to the embodiment shown. Likewise, instead of the 1: 1 version, another translation can be selected.

The drive motor 5 is mounted on two transverse struts 14. At the non-output end, that is the traction sheave 7 opposite end 18 of the drive motor 5, a brake 16 is arranged. This brake 16 can be designed as a simple disc brake, since the diameter of the drive shaft is not too large here.

At the other end of the frame, a guide roller 10 is rotatably mounted on a fixed axis 20. The guide roller 10 has a bearing 11 which cooperates with the axis 20. The axis 20 is fixed on both sides of the guide roller 10 in bearing blocks 17, which are each mounted on a transverse strut 14 ( Fig. 6 ). About the guide roller 10 four second cables 12 are guided, which are connected in a 1: 1 version with the cab 2 and a counterweight 8.

The shaft 6 of the drive motor 5 and the axis 20 of the guide roller 10 are in this embodiment on a common axis 19 whereby the parallel guidance of the cab 2 is facilitated.

An elevator 1 has a driving cab 2, a drive motor 5 with a traction sheave 7, a counterweight 8 and a non-driven deflecting roller 10, wherein at least a first cable 9 is connected to the driving cab 2 and the counterweight 8 and is driven by the traction sheave 7, and at least one second cable 12 is connected to the driving cab 2 and the or a further counterweight 8 and is guided over the deflection roller 10.

LIST OF REFERENCE NUMBERS

1

elevator

2

driving cab

3

elevator drive

4

frame

5

drive motor

6

wave

7

first traction sheave

7 '

second traction sheave

8th

counterweight

9

first rope

10

idler pulley

11

warehouse

12

second rope

13

carrier

14

crossmember

16

brake

17

bearing block

18

Non-driven side

19

axis of rotation

Claims (6)

1. Method for retrofitting a lift (1), in particular a panoramic lift, wherein the lift (1) has a drive motor (5), in particular an internal rotor motor, which is coupled, preferably directly, to a first sheave (7) and a second sheave (7'), wherein the first sheave (7) drives at least one first rope (9), which is connected to a lift car (2) and a counterweight (8), and the second sheave (7') drives at least one second rope (12), which is connected to the lift car (2) and the, or a further, counterweight (8), wherein the first sheave (7) and the second sheave (7') are arranged on opposite sides of the drive motor (5), and wherein the drive motor (5) is changed over for a different drive motor (5), characterized in that, at a position of the first sheave (7), a sheave (7) is set up and coupled to the different drive motor (5), and in that, at a position of the second sheave (7'), a driveless deflecting roller (10) is set up.
2. Method according to Claim 1, characterized in that a plastic coating is formed, in particular as a rope sheathing and/or as a sheave rest, between a steel core of the at least one first rope (9) and the sheave (7), and/or in that the deflecting roller (10) is mounted on a frame (4), which carries the drive motor (5) and/or the first sheave (7).
3. Method according to Claim 1 or 2, characterized in that an axis of rotation of the deflecting roller (10) is aligned with an axis of rotation of the sheave (7), and/or in that the deflecting roller (10) is arranged above the lift car (2).
4. Method according to one of Claims 1 to 3, characterized in that the at least one first rope (9) and the at least one second rope (12) are fastened at opposite ends of the lift car (2), and/or in that the at least one first rope (9) and/or the at least one second rope (12) are/is guided in corners of the lift-car shaft.
5. Method according to one of Claims 1 to 4, characterized in that the first sheave (7) is coupled directly, in particular in a gearless manner, to the drive motor (5), and/or in that the drive motor (5) used is an internal rotor motor and is provided with a brake (16) on a side (18) which is preferably directed away from the first sheave (7).
6. Method according to one of Claims 1 to 5, characterized in that a plastic coating is retrofitted, in particular as a rope sheathing and/or as a sheave rest, between a steel core of the at least one first rope (9) and the first sheave (7).

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