DE102019203727A1 - Elevator system with profiled carrying strap - Google Patents

Abstract

Elevator system with a carrying belt profiled at least on one side and at least one drive roller or pulley, the carrying belt looping around the drive roller or pulley on its respective drive side to transmit the drive force over a partial circumference, characterized in that at least the side of the carrying belt opposite the drive side with a profiling running in the longitudinal direction of the support belt is formed and at least one guide or deflection roller, which is arranged in the immediate vicinity of the drive pulley, has a complementary surface to the profiling and engages in the latter, is provided, the profiling and guide or deflection roller being designed and arranged in such a way that the carrying belt is guided through the guide roller on the drive pulley, preferably in the middle.

Description

The invention relates to an elevator system with a carrier belt profiled at least on one side and at least one drive roller or pulley, the carrier belt looping around the drive roller or pulley on its respective drive side to transmit the drive force over a partial circumference.

Carrying straps have become more and more popular in elevator technology for years. First of all, the flat belts should be mentioned here, which have to be guided over spherical pulleys on which the belts can be centered. Sufficient space must be available for this, which ultimately leads to a relatively large overall width of the drive pulley and the deflection pulleys. In addition, when using crowned pulleys, the tension members or cords located in the middle of the belt are more heavily loaded than the outer cords. This can lead to a reduction in service life.

Another type of suspension means are ribbed belts or V-ribbed belts, that is to say with elevations running in the longitudinal direction of the belt, which are guided in grooves on the traction or drive pulley. In theory, several suspension elements or elevator belts could be placed there close to one another. However, if these suspension elements with their usually smooth backs are guided over smooth, unprofiled deflection pulleys, they must again be spherical for centering, which the above-mentioned Including disadvantages.

Alternatively, ribbed belts can be twisted towards the deflection pulley, i.e. before running onto the deflection pulley, i.e. rotated once around its longitudinal axis, so that guidance in grooves is also possible on the deflection pulley. However, this “twist” also requires additional installation space, particularly in the longitudinal direction of the belt. Furthermore, the cords in the edge area are then more heavily loaded than the central cords when twisting / twisting, so that a reduction in the service life cannot be ruled out here either.

On the other hand, a design of pull straps, carrying straps or pull-out straps with profiles is considered advantageous for various reasons, e.g. with a view to increasing the power transmission between pulley and belt, for better guidance of traction means, or to influence the shear forces between tension members and rubber matrix.

Finally, ribbed belts can also be used on both sides, i.e. be provided with profiles or ribs both on the drive side / traction side and on the rear side, so that a relatively compact design is possible for the entire drive with deflections.

The belt side lying on the drive roller or the belt side wrapping around the drive roller is usually the drive side, while the opposite belt side, which usually wraps around deflection rollers, is referred to as the belt back or belt back. The term “traction side” is also used as a synonym for the term “drive side”. Likewise, instead of the term “rear side”, the term “deflection side” is used.

The DE 34 11 772 A1 discloses a drive belt, on the drive side of which elevations and depressions are formed, which run in a mating profile which is formed on the outer circumference of the belt pulleys belonging to the belt drive or elevator system. In the area of the elevations, a tension cord formed in the longitudinal direction is arranged in each case. As a result, the surface pressure between the drive belt and pulley is evened out.

Such suspension elements with elevations and depressions on the drive side have been specially developed for elevators in order to ensure a special frictional connection and axial guidance on the traction sheave. The drive sheave is provided with complementary grooves and the smooth back runs over smooth, convex deflection sheaves without any power transmission .

The smooth back of such a shoulder strap can also be used technically as a traction side. In this case, the smooth back runs on an equally smooth, convex traction disc. The profiled suspension element side is then in force-free engagement with profiled deflection discs.

Both of the above-mentioned systems, that is to say the drive via the profiled side or the drive via the smooth side, have the disadvantage that the use of at least one smooth, spherical disk is necessary. The spherical, smooth disk must be wider than the suspension element, since an axial alignment of the suspension element must be possible. As already explained above, when the flat side is guided over spherical disks, enough space must be available for the larger roll width / disk width, which ultimately leads to a relatively large overall width of the entire system. The use of spherical, smooth disks thus limits the minimum overall width of the system.

The minimum possible system width can also be used by twisting the suspension element by 180 °. This configuration enables the profiled side of the Support rope is in engagement with a profiled disc.

The object of the invention was therefore to provide an elevator system in which the smallest possible system width for the support elements and rollers can be achieved, which therefore requires the smallest possible installation space and allows narrow shaft guides, which requires components that are as easy to manufacture as possible and with regard to the drive rollers and drives can be made as variable as possible.

This problem is solved by the features of the main claim. Further advantageous designs are disclosed in the subclaims.

In this case, at least the side of the support belt opposite the drive side is designed with a profile running in the longitudinal direction of the support belt. Furthermore, at least one guide or deflecting roller is provided in the immediate vicinity of the drive pulley, its surface is complementary to the profiling and engaging in the latter, the profiling and guide or deflecting roller being designed and arranged in such a way that the support belt is passed through the guide roller on the drive pulley is guided, is preferably guided in the middle.

With such a design you can basically do without the crowning and thus a large and the width of the suspension means by far exceeding the width of the drive rollers, since the guidance or centering of the support belt on the drive roller is not done via the drive roller itself, but via an in profiled leadership role in the neighborhood. The guide roller and the drive roller can be arranged with axes parallel to each other, i.e. in other words next to, above or in alignment with one another so that the installation space is minimized. In this sense, a particularly simple advantageous further development consists in the fact that the carrying belt is smooth and without profiling on the drive side. Very narrow drive rollers can be used here.

A further advantageous embodiment consists in the fact that the guide roller or deflection roller engages in the profiling on the strand running onto the drive pulley and / or on the strand running off the drive pulley. In this way, one-sided or two-sided guidance can be achieved in a particularly simple manner, in particular also guidance with different directions of rotation of the drive roller or drive disk.

A further advantageous embodiment consists in the fact that the drive pulley is provided with a crowning of the surface which additionally centers the carrying belt over at least part of its support width provided for the carrying belt. In such an embodiment, a crowning of the drive roller or disk is not entirely dispensed with, but rather only an extremely small crown or a crown of only a small lateral extent is provided. Since the shoulder strap is positioned over guide rollers, an extremely small crown can be used or even crown can be dispensed with entirely. The principle of guiding by crowning has the disadvantage that, as already briefly outlined above, there is a different stress distribution over the axial cross section of the suspension element. A suspension element in connection with a smooth disk also has a homogeneous stress distribution, which has a favorable effect on wear in the suspension element and the disk.

Another advantageous embodiment in this sense consists in the fact that the drive pulley is provided with at least one flanged pulley centering the support belt. Here, however, depending on the application, it must be considered whether signs of wear on the flanged disk do not outweigh the advantage of the additional centering.

Another advantageous embodiment consists in that the guide roller and the drive roller or pulley are arranged in such a way that the following formula applies to the ratio of the width PW of the drive pulley to the width TMW of the support belt: $$\left(\frac{P\mathrm{W.}}{T\mathrm{M.}\mathrm{W.}}\right)\text{/ 2}\le \text{1}\text{,1}$$

With the inventive arrangement of profiled guide rollers in the immediate vicinity of a smooth drive roller, the width of the spherical, smooth drive roller or disk can be reduced to a minimum.

A further advantageous embodiment consists in that the carrying belt as a traction means according to claim 1 of EP 2 146 919 B1 is trained. The relevant content of the EP 2 146 919 B1 reference is made in full. This is a traction device that can be driven by a traction sheave and is designed as a composite rope. Individual ropes lying in parallel are each encased with an elastomer layer of a predetermined thickness to form tension members with a total diameter and connected to one another on one side by an elastomeric connector layer essentially over their entire length. The tension members engage in corresponding grooves of the traction sheave, that is, the tension means there according to the teaching of EP 2 146 919 B1 is powered on the profiled soap. This constellation is used when using of the traction means according to the present invention, so that the traction carrier is now guided on the profiled side, that is to say the side, and driven on the side provided with the elastomeric connector layer. Known carrying straps can thus be used in a simple manner for the elevator system according to the invention.

A further advantageous embodiment consists in the fact that the carrying belt can be driven on both sides and, for this purpose, at different locations in the elevator system, the respective carrying belt sides wrap around drive rollers or pulleys for transmitting the drive force over a partial circumference. As a result, it can be used for different types of elevator and the possible uses of the elevator system according to the invention are broadened.

• 1 - 3 prinzipiell und im Halbschnitt die Auflageverhältnisse eines mit einer glatten Seite auf einer Antriebsrolle oder -scheibe aufliegenden Tragriemens des erfindungsgemäßen Aufzugsystems,
• 4 die im Stand der Technik übliche Auflage eines Tragriemens, der auf seiner glatten Seite über eine Antriebsrolle oder -scheibe angetrieben wird
• 5 - 7 verschiedene Ausführungen der erfindungsgemäßen Anordnung von Antriebsrollen oder -scheiben und jeweils zugehörigen Führungsrollen.

The invention is to be explained in more detail using an exemplary embodiment. Show it

• 1 - 3 in principle and in half-section, the support conditions of a support belt of the elevator system according to the invention, one smooth side resting on a drive roller or pulley,
• 4th the usual prior art support of a support belt which is driven on its smooth side via a drive roller or pulley
• 5 - 7th different versions of the inventive arrangement of drive rollers or pulleys and respective associated guide rollers.

The 1 to 3 show in principle and in half-section the bearing conditions of one with its smooth side 3 on a drive roller or pulley 4.1 to 4.4 overlying shoulder strap 1 , with a profile running in the longitudinal direction of the carrying belt 2 and which is guided by at least one guide or deflection roller arranged in the immediate vicinity of the drive pulley, complementary to the profiling and engaging in the latter, on the drive pulley or pulley. The respective guide or pulley is shown in the views of 1-3 not shown for the sake of clarity.

1 shows the support of the shoulder strap 2 on a smooth drive roller or pulley 4.1 , 2 the support on a spherical drive roller 4.2 and 3 the support on a partially convex drive roller 4.3 .

4th In comparison, shows the support of a carrying belt that is customary in the prior art 1 that is on its smooth side 3 via the drive roller or pulley 4.4 is driven without one in the immediate vicinity of the drive pulley 4.4 arranged, complementary to the profiling and engaging in the latter guide or deflection roller is provided.

The decisive factor here is the ratio of the width PW of the drive pulley to the width TMW of the support belt, for which the following applies in the embodiment according to the invention: $$\left(\frac{P\mathrm{W.}}{T\mathrm{M.}\mathrm{W.}}\right)\text{/ 2}\le \text{1}\text{,1}$$

The terms PW and TMW are common abbreviations for English-language expressions in the specialist field and mean Pulley Width (PW = width of the drive pulley) and Traction Media Width (TMW = width of the pulling belt / carrying belt). Both 1 to 3 strives against this relationship 1 , while the 4th a far unfavorable ratio can be seen, which means that the width PW of the drive roller or pulley significantly exceeds the width TMW of the support belt. The installation space required for such a role is therefore increased.

5 to 7th show various embodiments of the inventive arrangement of drive rollers or pulleys 4 and respective associated guide rollers 5 .

In the 5 there is another pulley on the side of the counterweight 6th provided with a smooth surface, which also has a profiled guide roller 5 is combined in such a way that the carrying strap is also centered on this smooth pulley 6th is centered.

6th shows the inventive arrangement of a drive roller or disk 4th , with the two guide or deflection pulley 5 engages in the profiling on the run running onto the drive pulley and on the run running down from the drive pulley. The run-side and run-up side alternate depending on the direction of rotation of the drive roller or pulley 4th or depending on the upward and downward movement of the cabin.

In principle the same arrangement shows 7th . Here, however, are the two guide or pulleys 5 and mounted approximately level with the axis of the drive roller or pulley.

List of reference symbols

1

Tragriemen

2

Profilierung

3

Glatte Seite

4

Antriebsrolle oder -scheibe (4.1 bis 4.4)

5

profilierte Führungsrolle

6

Umlenkrolle mit glatter Oberfläche

(Part of the description)

1

Shoulder strap

2

Profiling

3

Smooth side

4th

Drive roller or pulley ( 4.1 to 4.4 )

5

profiled leadership role

6th

Deflection pulley with a smooth surface

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 3411772 A1 [0008]
• EP 2146919 B1 [0022]

Claims (8)

Elevator system with a support belt (1) profiled on at least one side and at least one drive roller or pulley (4, 4.1, 4.2, 4.3,), the support belt looping around the drive pulley or pulley on its respective drive side to transmit the drive force over a partial circumference, characterized in that at least the side of the support belt (1) opposite the drive side is designed with a profile (2) running in the longitudinal direction of the support belt and at least one guide, which is arranged in the immediate vicinity of the drive pulley, has a surface complementary to the profile and engages in the latter - Or deflection roller (5) is provided, the profiling (2) and guide or deflection roller being designed and arranged in such a way that the support belt is guided through the guide roller on the drive pulley, preferably in the middle. Elevator system according to Claim 1 , in which the carrying belt (1) is smooth and without profiling on the drive side. Elevator system according to Claim 1 or 2 , in which the guide or deflection roller (5) engages in the profiling on the run running onto the drive pulley and / or on the run running down from the drive pulley. Elevator system according to one of the Claims 1 to 3 , in which the drive pulley (4, 4.1, 4.2, 4.3,) is provided with a crowning of the surface centering the carrying belt over at least part of its support width provided for the carrying belt. Elevator system according to one of the Claims 1 to 4th , in which the drive pulley (4, 4.1, 4.2, 4.3,) is provided with at least one flanged pulley centering the carrying belt. Elevator system according to one of the Claims 1 to 5 , in which the guide roller (5) and the drive roller or pulley (4, 4.1, 4.2, 4.3,) are arranged in such a way that the ratio of the width PW of the drive pulley to the width TMW of the carrying belt applies: $$\left(\frac{P\mathrm{W.}}{T\mathrm{M.}\mathrm{W.}}\right)\text{/ 2}\le \text{1}\text{,1}$$

Elevator system according to one of the Claims 1 to 6th , in which the shoulder strap as a traction device according to Claim 1 EP 2 146 919 B1 is designed. Elevator system according to Claim 7 , in which the support belt can be driven on both sides and for this purpose wraps around drive rollers or pulleys at different locations in the elevator system with the respective support belt sides to transmit the drive force over a partial circumference.

Images