DE202022107094U1 - drive belt - Google Patents

Abstract

driving belt delimited by two opposite flanks (5), by a front surface cooperating in contact with the driving elements and by a rear surface opposite to the front surface; wherein the belt comprises:
a. a band section;
b. an array of filiform reinforcement inserts (10) embedded in the belt portion and made of non-ferromagnetic material;
c. two filiform diagnostic inserts (16A) symmetrically arranged on opposite sides with respect to a median plane of symmetry extending transversely of the front and rear surfaces; said filiform diagnostic inserts (16A) being made of a ferromagnetic material, embedded in said band portion and extending parallel to said filiform reinforcing inserts (10); characterized in that the two filiform diagnostic inserts (16A) on the outside of the group of filiform reinforcement inserts (10) and respectively in the Are arranged near a flank (5).

Description

FIELD OF THE INVENTION

The present invention relates to a power transmission belt.

BACKGROUND

As is known, drive belts are universally used both in the field of conveyor belts, where they are generally of the closed ring type, and as driving or moving inserts. In the latter case the drive belts move clutches or containers, e.g. elevator cars etc. in opposite directions and are usually of the open type.

As is also known, drive belts are made of elastomeric, thermoplastic or polyurethane materials and comprise an elongate belt portion bounded by a rear surface and of generally rectangular cross-section, and a smooth or toothed traction portion cooperating with the drive wheels, on which the strap is partially wound.

Embedded within the belt portion are a plurality of filiform reinforcement inserts, commonly referred to as "cords", which extend longitudinally of the belt to carry the tension load on the belt due to the load being moved or torque being transmitted.

There are different materials from which the filiform reinforcement inserts are made.

One type of these filiform reinforcement inserts includes the "plastic cords" made of plastic material such as aramid, carbon, fiberglass or other plastic fibers.

As with belts in general, there is also a need for plastic cord belts to automatically and quickly detect the actual degree of wear of the filiform inserts in order to be able to intervene in good time and prevent belt breakage.

With plastic cord belts, it is now practically impossible to precisely determine the actual state of wear or wear of the filiform inserts using automatic diagnostic equipment at different points in the belt's service life.

Therefore, it is usually recommended that these types of belts be replaced during preventative maintenance, with the disadvantage that belts are sometimes replaced when they still have some life remaining. In other cases, not even this recommendation is followed and the belts are only replaced when the belt breaks, which is associated with relatively long machine downtimes and costs.

OVERVIEW

The aim of the present invention is therefore to produce a transmission belt provided with filiform inserts made of plastic material, the design characteristics of which make it possible to meet the aforesaid needs in an extremely simple and inexpensive way, and in particular to precisely determine the condition or degree of wear of the filiform inserts made of plastic material know and intervene before they reach the end of their useful life and/or before the material of the belt body shows unwanted cracks.

1. a. einen Bandabschnitt;
2. b. eine Gruppe von filiformen Einsätzen, die in den Bandabschnitt eingebettet sind und aus nichtferromagnetischem Material hergestellt sind;
3. c. zwei filiforme Diagnoseeinsätze, die auf gegenüberliegenden Seiten in Bezug auf eine mittlere Symmetrieebene symmetrisch angeordnet sind, die sich quer zu den vorderseitigen und rückseitigen Oberflächen erstreckt; wobei die filiformen Diagnoseeinsätze aus einem ferromagnetischen Material hergestellt sind, in den Bandabschnitt eingebettet sind und sich parallel zu den filiformen Verstärkungseinsätzen erstrecken; dadurch gekennzeichnet, dass die beiden filiformen Diagnoseeinsätze im Außenbereich der Gruppe von filiformen Verstärkungseinsätzen und jeweils in der Nähe einer Flanke angeordnet sind.

According to the invention, a transmission belt is made, delimited by two opposite flanks, by a front surface cooperating in contact with the driving elements and by a rear surface opposite to the front surface; wherein the belt comprises:

1. a. a band section;
2. b. an array of filiform inserts embedded in the band portion and made of non-ferromagnetic material;
3. c. two filiform diagnostic inserts symmetrically arranged on opposite sides with respect to a median plane of symmetry extending transversely to the front and rear surfaces; wherein the filiform diagnostic inserts are made of a ferromagnetic material, are embedded in the band portion and extend parallel to the filiform reinforcing inserts; characterized in that the two filiform diagnostic inserts are arranged externally of the group of filiform reinforcing inserts and each in the vicinity of a flank.

character list

• - 1 eine perspektivische Teilansicht einer bevorzugten Ausführungsform des gemäß den erfindungsgemäßen Lehren hergestellten Antriebsriemens ist;
• - 2 eine Ansicht gemäß dem Pfeil A in 1 ist;
• - die 3 und 4 in stark vergrößertem Maßstab zwei verschiedene Abschnitte der 2 zeigen; und
• - die 5 und 6 perspektivische Ansichten von zwei Abschnitten der 1 in stark vergrößertem Maßstab sind.

The invention will now be described with reference to the accompanying figures, in which an exemplary embodiment is shown without any limiting effect, in which:

• - 1 Figure 12 is a partial perspective view of a preferred embodiment of the drive belt made in accordance with the teachings of the present invention;
• - 2 a view according to arrow A in 1 is;
• - the 3 and 4 on a greatly enlarged scale two different sections of the 2 show; and
• - the 5 and 6 perspective views of two sections of the 1 are on a greatly enlarged scale.

DESCRIPTION OF EMBODIMENTS

In 1 the number 1 designates a section of a drive belt 2 (partially shown).

Depending on its application, the drive belt 2 can be of the closed type or of the open type.

In all cases, the belt 2 is flexible in order to be able to follow curved routes and adapt to changes in direction, and to wrap at least partially around pulleys, not shown.

In the example shown here, the belt 2 is a toothed belt with a plurality of teeth 3.

According to variants not shown, the strap 2 is a flat strap, i. H. without teeth, or a poly-V belt, or a belt provided with protrusions whose geometries and/or dimensions vary according to the belt's field of application.

Whether teeth are present or not, the belt 2 consists of a body 4 made in one piece of polymeric or elastomeric material, such as polyurethane or a thermoplastic elastomer.

The body 4 is delimited by two opposite lateral flanks 5, by a rear surface 6 and by a contact surface 7 opposite the rear surface 6 and suitable for coming into contact with idler wheels or drive wheels, not shown.

The surface 7 is shaped to define the teeth 3 and is smooth for belts without teeth or projections or ribbed for poly-V belts.

As in the 1 until 4 As can be seen, the body 3 comprises a band portion 9 which has a substantially rectangular cross-section and is bounded by the rear surface 6. FIG. If present, the teeth 3 protrude from the band section 9 .

Referring to the 1 and 2 and in particular to the 5 and 6 For example, the strap 1 comprises a group S of filiform reinforcement inserts, indicated by the reference numeral 10, commonly referred to as "cord", embedded in the band portion 9 and extending parallel to a longitudinal direction 12 of the extension of the strap 2 ( 1 ) to carry the tensile load exerted on the belt 2 during use.

In the example described, the cords 10 extend parallel to the longitudinal direction 12 and are distributed next to one another in a transverse direction 13, at right angles to the longitudinal direction 12 and parallel to the rear surface 6, in a step P ( 2 and 4 ). The group S of cords 10 is symmetrical with respect to a longitudinal median plane 18 parallel to the direction and perpendicularly crossing the surfaces 6 and 7. The surface 18 is coincident with the longitudinal median plane of the belt 2.

The cords 10 are generally made of non-ferromagnetic material, in particular plastic material, for example with aramid fibers or glass fibers or other plastic fibers.

Each cord 10 is typically cylindrical and has a standard outside diameter, for example 0.91 millimeters, depending on the dimensions of the belt and the load to be carried.

Also with reference to the 2 and in particular to the 3 and 4 For example, the belt 2 further includes a group of filiform inserts 16 for diagnosing the condition or degree of wear of the cords 10. Each diagnostic filiform insert 16 is a continuous insert made of ferromagnetic material.

The filiform diagnostic inserts 16 are preferably made of metal wires.

The filiform diagnostic inserts 16 are usually embedded in the band section 9 .

The filiform diagnostic inserts 16 preferably extend over the entire length of the cords 10.

Preferably, the filiform diagnostic inserts 16 also extend parallel to the cords 10.

The filiform diagnostic inserts 16 are arranged symmetrically with respect to the longitudinal center plane 18 .

The strap 2 comprises two diagnostic filiform inserts at the opposite lateral ends of the strap, indicated at 16A, and preferably two central diagnostic filiform inserts, indicated at 16B.

Each filiform insert 16A is located between a respective flank 5 and the first cord 10, starting from the flank 5. Typically, each filiform insert 16A is located a distance D from the respective flank 5 which is not more than 50% of the distance between the flank 5 and the first cord 10 available space.

On the other hand, the two central filiform inserts 16B are symmetrical and arranged on opposite sides of a median longitudinal plane 18 of the belt 2 and respectively in the outer region of the cord closest to the median longitudinal plane 18 .

The filiform inserts 16A, 16B are preferably made of steel.

Typically, the filiform inserts 16A, 16B also have the same cross-section.

Typically, each filiform insert 16A, 16B is further defined by a monofilament insert or by a group of metal wires wound, for example, helically. Alternatively, each filiform insert 16A, 16B is defined by a stranded wire. In general, the material and/or the dimensions and/or the mechanical strength properties of the filiform diagnostic inserts 16 are determined by the material and/or the number and/or the mechanical strength properties of the cords 10 since the filiform diagnostic inserts 16 undergo a partial or complete break should reach 10 before the cords begin to wear out.

The ratio d/D is usually less than or equal to 0.55, where d denotes the diameter of the filiform diagnostic insert 16 and D denotes the diameter of the cord 10 in the belt in question.

In the example shown, the filiform diagnostic inserts 16 have an outer diameter of 0.015 millimeters.

Typically, each filiform diagnostic insert 16 is selected and/or sized to have a breaking load (or tensile load) that is less than or equal to one-fourth the breaking load of the individual cord 10 forming the belt reinforcement.

Typically, the flex life of any filiform diagnostic insert is less than or equal to 95% of the flex life of the cord 10, taking into account the minimum bend radius to which the belt will be subjected during the specific application.

When dimensioning the belt, the filiform diagnostic inserts 16 are not relevant, as they only serve to record the “state of health” of the belt, while the load-bearing capacity is only given by the cords 10.

During use, it is possible by means of an ordinary magnetic induction diagnostic tool - before the assembly of the belt 2 or after the assembly is completed - to obtain a reference value of a significant characteristic indicative of magnetic induction with the filiform diagnostic inserts 16 fully intact. In particular, a reference mapping is obtained in relation to the magnetic induction of the filiform diagnostic inserts 16.

Then, at any time during the life of the belt 2, this diagnostic tool is used to perform the same test (e.g. at the same speed between the belt and the detection probe) to detect the same feature or mapping that indicates the induction of the filiform diagnostic inserts 16. Any differences can be identified by comparing the results of the new test to the reference feature or map. When the difference between the sensed features/maps and the reference features/maps exceeds a predetermined threshold, the cords 10 and/or the belt body have reached or are approaching the end of their useful life and the belt 2 must be replaced.

Thus, in an indirect way, the state of the cords 10 and/or the whole belt 2 before its breakage is recognized, so that immediate maintenance interventions can be carried out before the belt 2 breaks or its remaining life can be estimated.

It is clear from the above statements that the number of filiform diagnostic inserts 16 in the belt 2 can differ from that described here. In particular, it is advantageous to have at least one filiform insert 16B in the middle of the belt and two filiform inserts 16A at the ends, since this makes it possible to monitor the health of the belt over its entire extent.

Claims (7)

driving belt delimited by two opposite flanks (5), by a front surface cooperating in contact with the driving elements and by a rear surface opposite to the front surface; the strap comprising: a. a band section; b. an array of filiform reinforcement inserts (10) embedded in the belt portion and made of non-ferromagnetic material; c. two filiform diagnostic inserts (16A) symmetrically arranged on opposite sides with respect to a median plane of symmetry extending transversely of the front and rear surfaces; said filiform diagnostic inserts (16A) being made of a ferromagnetic material, embedded in said band portion and extending parallel to said filiform reinforcing inserts (10); characterized in that the two filiform diagnostic inserts (16A) are arranged on the outside of the group of filiform reinforcing inserts (10) and each in the vicinity of a flank (5). drive belt after claim 1 , characterized in that the filiform diagnostic inserts (16A) extend over the entire length of the filiform reinforcing inserts (10). drive belt after claim 1 or 2 , characterized in that each filiform diagnostic insert (16A) is arranged at a distance (D) from the corresponding flank (5) and the distance is not more than 50% of the distance between the corresponding flank (5) and the first filiform reinforcing insert (10) existing space - starting from the edge (5) - is. drive belt after claim 1 , characterized in that it comprises a further filiform diagnostic insert (16B) arranged close to or on the longitudinal median plane. Transmission belt according to one of the preceding claims, characterized in that the ratio between the diameter of the filiform diagnostic inserts (16A) and the diameter of the filiform reinforcing inserts (10) is less than 0.55. Transmission belt according to any one of the preceding claims, characterized in that the breaking load of each filiform diagnostic insert (16A) is less than or equal to a quarter of the breaking load of each filiform reinforcing insert (10). Drive belt according to one of the preceding claims, characterized in that the flexural fatigue strength of each filiform diagnostic insert (16A) is less than or equal to 95% of the flexural fatigue strength of each filiform reinforcement insert (10).

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