CN217229867U

CN217229867U - Lifting system with profiled suspension straps

Info

Publication number: CN217229867U
Application number: CN202090000441.0U
Authority: CN
Inventors: 胡贝特·高瑟; 扬-亨宁·夸斯; 塞巴斯蒂安·伊劳舍克
Original assignee: ContiTech Antriebssysteme GmbH
Current assignee: ContiTech Antriebssysteme GmbH
Priority date: 2019-03-19
Filing date: 2020-01-27
Publication date: 2022-08-19
Anticipated expiration: 2030-01-27
Also published as: DE102019203727A1; WO2020187469A1; EP3941872A1

Abstract

A lifting system with a suspension belt (1) profiled at least on one side and at least one drive roller or drive wheel (4.1), wherein the suspension belt is wound around the drive roller or drive wheel on its respective drive side in a loop to transmit a drive force over a partial circumference, wherein at least the side of the suspension belt opposite the drive side is formed with a profile (2) extending in the longitudinal direction of the suspension belt and is provided with at least one guide roller or guide roller which is arranged in the immediate vicinity of the drive wheel, whose surface is formed complementary to the profile and engages into the profile, wherein the profile and the guide roller or guide roller are formed and arranged such that the suspension belt is guided, preferably centrally, by means of the guide roller on the drive wheel.

Description

Lifting system with profiled suspension straps

Technical Field

The present invention relates to a lifting system having a suspension belt which is profiled at least on one side and at least one drive roller or drive wheel, wherein the suspension belt is wound around the drive roller or drive wheel on its respective drive side in order to transmit a drive force over a partial circumference.

Background

In recent years, sling belts have been increasingly used in lifting and lowering technology. In this case, mention may be made, firstly, of flat belts which must be guided by drum-shaped wheels on which the belt can be centered. Sufficient space must be provided for this, which ultimately results in a relatively large structural width of the drive wheel and the guide wheel. Furthermore, when using drum-shaped wheels, the tensile carrier or cord in the center of the belt is subjected to a greater load than the outer cords. This may result in a reduced service life.

Other types of suspension means are v-ribbed belts or v-ribbed belts, i.e. with protrusions extending in the longitudinal direction of the belt, which protrusions are guided into the grooves on a traction or drive wheel. There, theoretically a plurality of suspension means or lifting belts can be placed closely alongside one another. However, if the suspension means are guided with their generally smooth back, but by means of smooth, non-profiled guide rollers, they must again be drum-shaped for centering, which involves the disadvantages described above.

Alternatively, the v-ribbed belt can be twisted, i.e. rotated once about its longitudinal axis, towards the guide wheel (i.e. before running up to the guide wheel), so that a guidance into the groove can also be achieved on the guide wheel. However, such twisting requires additional installation space, in particular in the longitudinal direction of the strip. Furthermore, the cords in the edge regions are subjected to a greater load than the central cords during twisting/twisting, so that here too a reduction in service life is not ruled out.

On the other hand, the design of the traction, suspension or tensioning belt with a profile is considered advantageous for various reasons, for example in order to increase the force transmission between the wheel and the belt, in order to achieve a better guidance of the traction means or to influence the shear forces between the traction carrier and the rubber matrix.

Finally, the v-ribbed belt can also be provided with profiles or ribs on both sides (i.e. not only on the drive/traction side but also on the rear side), so that a relatively compact construction can be achieved for the entire drive with the guide.

The belt side placed on or looped around the drive roller is generally the drive side, while the opposite belt side looped around the guide roller is generally referred to as the belt back or belt back side. The term "traction-side" is also used as a synonym for the term "drive-side". Also, instead of the term "dorsal", the nomenclature "leading-side" is used.

DE 3411772 a1 discloses a drive belt on the drive side of which projections and recesses are formed which extend with a mating contour which is formed on the outer circumference of a pulley belonging to a belt drive or a lifting system. In this case, a traction rope formed in the longitudinal direction is arranged in each case in the region of the elevations. Thereby making the surface pressure between the drive belt and the pulley uniform.

Such suspension means with protrusions and recesses on the drive side have been developed specifically for lifting devices in order to ensure a particular friction fit and axial guidance on the traction sheave. The drive wheel is provided with complementary grooves and the smooth back runs without force on a smooth, drum-shaped guide wheel without traction transmission.

Technically, the smooth back side of such a sling can also be used as the traction side. In this case, the smooth back runs on a likewise smooth, drum-shaped traction wheel. The profiled suspension means side is then in force-free engagement with the profiled guide wheel.

The two systems described above (i.e. the drive on the profiled side or the drive on the smooth side) have the following disadvantages: at least one smooth, crowned wheel is required. The drum-shaped, smooth wheel must be wider than the suspension means, since it must be possible to achieve an axial orientation of the suspension means. As already explained above, sufficient space must be available for a larger roll/wheel width in the case of a flat side guide on a drum wheel, which ultimately results in a relatively large structural width of the overall system. Thus, the use of a drum-shaped, smooth wheel defines the minimum structural width of the system.

The use of as small a system construction width as possible can also be achieved by twisting the suspension means through 180 °. With this arrangement it is achieved that the profiled side of the suspension cord engages the profiled wheel accordingly.

SUMMERY OF THE UTILITY MODEL

It is therefore an object of the present invention to provide a lifting system in which the smallest possible system width for the suspension elements and the rollers can be achieved, i.e. which therefore requires the smallest possible installation space and allows narrow passage guidance, which requires components that are as easy to manufacture as possible and which can be implemented as variably as possible in terms of the drive rollers and the drive.

This object is achieved by the features of the main claim. Further advantageous embodiments are disclosed in the dependent claims.

Here, at least one side of the sling opposite to the driving side is formed with a special-shaped portion extending in a longitudinal direction of the sling. Furthermore, at least one guide roller or guide roller is provided, which is arranged in the immediate vicinity of the drive wheel, the surface of which is formed complementarily to the profile and engages into the profile, wherein the profile and the guide roller or guide roller are formed and arranged such that the suspension belt is guided, preferably centrally, by means of the guide roller on the drive wheel.

With this design, it is possible in principle to dispense with the drum of the drive roller and thus the width of the drive roller, which is large and far exceeds the width of the suspension means, since the guidance or centering of the suspension tape on the drive roller is not performed by the drive roller itself, but by a closely adjacent, profiled guide roller. The guide roller and the drive roller can be arranged with axes parallel to one another, i.e. side by side, flush with one another above one another, so that the construction space is minimized. In this context, a particularly simple and advantageous development consists in: the suspension belt is implemented smooth and without a profile on the drive side. Here, very elongated drive rollers can be used.

Another advantageous embodiment consists in: the guide roller or guide roller engages into the profile on a return path running upwards to the drive wheel and/or on a return path running downwards from the drive wheel. In this way, guidance on one or both sides can be achieved particularly easily, in particular also in the case of different directions of rotation of the drive roller or drive wheel.

Another advantageous embodiment consists in: the drive wheel is provided, at least over a part of its support width for the suspension belt, with a drum of the surface which additionally centers the suspension belt. In this embodiment, the drum of the drive roller or drive wheel is not completely omitted, but rather, for example, only a minimally formed drum or a drum having only a small, lateral extent is provided. Since the sling is positioned by means of the guide rollers, it is possible to use a very small drum or even to omit the drum altogether. The principle of guiding by means of a drum has the following disadvantages: as already briefly mentioned above, this results in a different pressure distribution over the axial cross section of the suspension means. Furthermore, the suspension means connected to the smooth wheels have a uniform pressure distribution, which has a favourable effect on the wear in the suspension means and the wheels.

Another advantageous embodiment in this sense consists in: the drive wheel is provided with at least one retaining ring for centering the suspension belt. Here, however, a trade-off must be made depending on the application: the wear phenomena at the retainer ring have the advantage that the additional centering is not counteracted.

Another advantageous embodiment consists in: the guide roller and the drive roller or drive wheel are arranged such that the following formula holds for the ratio of the width PW of the drive wheel to the width TMW of the sling:

the width of the drum-shaped, smooth drive roller or drive wheel can be reduced to a minimum by the arrangement according to the invention of the profiled guide roller in the immediate vicinity of the smooth drive roller.

Another advantageous embodiment consists in: the sling is formed as a traction device according to claim 1 of EP 2146919B 1. Reference is made in full to EP 2146919B 1 in relation thereto. The invention relates to a traction means which can be driven by a traction sheave and which is formed as a composite rope. The individual strings placed in parallel are each wrapped with an elastomer layer of a predetermined thickness to form a tensile carrier of overall diameter and are connected to one another on one side by an elastomer connecting layer over substantially their entire length. The tensile carrier engages into the corresponding grooves of the traction wheel, namely: according to the teaching of EP 2146919B 1, the traction means therein is driven on the profiled side. This is excluded when using the traction means according to the invention, so that the traction means is now guided on the profiled side (i.e. on the side of the tensile carrier) and driven on the side provided with the elastomer connection layer. The known suspension straps can therefore be used in a simple manner for the lifting system according to the invention.

Another advantageous embodiment consists in: the suspension belt can be driven on both sides and for this purpose is wound around a drive roller or drive wheel at different positions of the lifting system with the respective suspension belt side to transmit the drive force over a partial circumference. This makes it possible to achieve usability for different types of lifting devices and to expand the use possibilities of the lifting system according to the invention.

Drawings

The present invention will be described in detail with reference to examples. In the drawings:

figures 1-3 show in principle and in half section the support of a sling according to the invention placed with a smooth side on a driving roller or wheel,

fig. 4 shows a support of a sling, which is conventional in the prior art, which is driven on its smooth side by means of a drive roller or drive wheel,

fig. 5 to 7 show various embodiments of the arrangement according to the invention of a drive or drive wheel and of a corresponding associated guide roller.

List of reference numerals

(part of the specification)

1 suspensory belt

2 special-shaped part

3 smooth side

4 drive roller or wheel (4.1 to 4.4)

5 profiled guide roller

6 guide roll with smooth surface

Detailed Description

Fig. 1 to 3 show in principle and in half section the support of a suspension belt 1 which is placed with its smooth side 3 on a drive roller or drive wheel 4.1 to 4.4, is formed with a profile 2 which extends in the longitudinal direction of the suspension belt and is guided over the drive roller drive wheel by means of at least one guide roller or guide roller which is arranged in the immediate vicinity of the drive wheel, is complementary to the profile and engages into the profile. For the sake of clarity, the respective guide rollers or guide rollers are not shown in the views of fig. 1 to 3.

Fig. 1 shows the support of the suspension belt 2 on a smooth drive roller or drive wheel 4.1, fig. 2 shows the support on a drum-shaped drive roller 4.2, and fig. 3 shows the support on a partially drum-shaped drive roller 4.3.

In contrast, fig. 4 shows the support of a suspension belt 1, which is customary in the prior art, which is driven on its smooth side 3 by means of a drive roller or drive wheel 4.4, without provision of a guide roller or guide roller which is arranged in the immediate vicinity of the drive wheel 4.4, is complementary to the profile and engages into the profile.

The ratio of the width PW of the drive wheel to the width TMW of the suspension belt is critical here, and it holds in an embodiment according to the invention for this ratio:

the designations "PW" and "TMW" are common acronyms in the art and refer to Pulley Width (the Width of the drive wheel) and Traction Media Width (the Width of the Traction/suspension belt). In fig. 1 to 3, this ratio is approximately close to 1, while the most unfavorable ratio can be seen in fig. 4, which results in the width PW of the drive roller or drive wheel significantly exceeding the width TMW of the sling. Thus increasing the required installation space for such a roller.

Fig. 5 to 7 show various embodiments of the arrangement according to the invention of the drive roller or drive wheel 4 and the respectively associated guide roller 5.

In fig. 5, a further guide roller 6 with a smooth surface is also provided on one side of the counterweight, which guide roller is likewise combined with the profiled guide roller 5 in such a way that the suspension belt is centered centrally also on the smooth guide roller 6.

To this end, fig. 6 shows an arrangement according to the invention of a drive or drive wheel 4, in which two guide or guide rollers 5 engage in the profile on the return path running upwards to the drive wheel and on the return path running downwards from the drive wheel. The return path on the downward travel side and on the upward travel side is changed depending on the direction of rotation of the drive roller or drive wheel 4 or depending on the upward and downward travel of the gondola (Kabine).

In principle, fig. 7 shows the same arrangement. Here, however, two guide rollers or guide rollers 5 are mounted and they are mounted approximately at the level of the axis of the drive roller or drive wheel.

Claims

1. A lifting system with a suspension belt (1) profiled at least on one side and at least one drive roller or drive wheel (4, 4.1, 4.2, 4.3), wherein the suspension belt is wound around the drive roller or drive wheel in a wrap-around manner on its respective drive side to transmit a drive force over a partial circumference, characterized in that at least the side of the suspension belt (1) opposite the drive side is formed with a profiling (2) extending in the longitudinal direction of the suspension belt and is provided with at least one guide roller or guide roller (5) which is arranged in the immediate vicinity of the drive wheel, whose surface is formed complementary to the profiling and engages into the profiling, wherein the profiling (2) and the guide roller or guide roller are formed and arranged such that the suspension belt is guided on the drive wheel by means of the guide roller, the guide roller (5) and the drive or drive roller (4, 4.1, 4.2, 4.3) are arranged such that the ratio of the width PW of the drive roller to the width TMW of the sling holds:

2. lifting system according to claim 1, characterized in that the profile (2) and guide rollers or guide rolls are formed and arranged such that the sling is guided centrally on the drive wheel by means of the guide rolls.

3. The lifting system as claimed in claim 1, characterized in that the sling (1) is implemented smooth and without profile on the drive side.

4. Lifting system according to claim 1, characterized in that the guide roller or guide roller (5) engages into the profile on a return run running up to the drive wheel and/or on a return run running down from the drive wheel.

5. Lifting system according to claim 1, characterised in that the drive wheel (4, 4.1, 4.2, 4.3) is provided with a drum of the surface centering the suspension belt at least over a part of its bearing width for the suspension belt.

6. Lifting system according to claim 1, characterised in that the drive wheel (4, 4.1, 4.2, 4.3) is provided with at least one retaining ring for centering the suspension belt.

7. Lifting system according to one of claims 1 to 6, characterized in that the suspension belt is formed as a traction means which can be driven by traction pulleys and is configured as a composite cable in which a plurality of parallel-lying individual cables of a first diameter are each surrounded by an elastomer layer of predetermined thickness to form tension supports of a corresponding overall diameter and which are connected to one another over substantially their entire length by a one-sided elastomer attachment layer and which engage in corresponding grooves of the traction pulleys, wherein the elastomer attachment layers are placed on the side of the tension supports facing away from the grooves to be engaged in the traction pulleys, and said tensile supports engage in the grooves of said traction sheave with at least 25% of their overall diameter.

8. The hoisting system as claimed in claim 7, characterized in that the suspension belt can be driven on both sides and for this purpose is wound round a drive roller or drive wheel with the respective suspension belt side at different positions of the hoisting system to transmit the drive force over a partial circumference.