DE10103254C2 - Uniformity of the rope or wire tensions in the production of belts reinforced with rope-like strength members - Google Patents

Description

The invention relates to a device for equalizing wire tensions in the manufacture of belts reinforced with rope-like reinforcements, according to the preamble of claim 1.

Conveyor belts and other flat belts, such as. B. elevator belts, usually have Steel cable inserts. There are also timing belts with comparable strength members.

First, the belt blanks are made from a thermoplastic melt with the help of an extruder. With the continuous assembly of such belt blanks with steel cable inlays or other comparable reinforcements, the Ropes to be inserted in parallel under even tension Elastomer mixtures are embedded. The blanks run over rollers and via at least one cooled mold wheel.

The production of conveyor belts and other flat belts with steel cable inserts is usually divided into several process steps:

• - Production of elastomer mixtures for the Cover plates and the adhesive mixture;
• - manufacture of steel cables;
• - Production of the steel cable carcasses, e.g. B. after Press process; and
• - Vulcanization of the belt blank.

A manufacturing section is of particular importance given from the end of the steel cables to the winding of the fully vulcanized steel cable flat belt. Thereby - about the different stretching behavior of the steel cables balance - all steel cables individually tensioned. The rope tension is not only in the clothing area but also in the vulcanization area. This means that the rope extension during the Vulcanization - especially due to exposure the vulcanization temperature - collected and the set rope tension must be kept constant.

The steel cables are pulled in and tensioned as follows:
Ropes filled with ropes are brought into the unwinding station. Each individual spool is equipped with an electromagnetic brake, which prevents the ropes from becoming de-energized or running on. Make sure that the individual steel cables are tensioned uniformly and evenly. Since this tension is currently still carried out individually for each steel cable, this results in a great technical outlay in the production device.

DE-OS 34 43 889 A1 describes a method for Manufacture of steel cord reinforced conveyor belts, whereby the steel cables by their individually assigned hydraulic tensioning cylinder throughout  Belt production can be performed. To be even Stress distribution in the reinforcement during the to maintain the entire belt production interconnected clamping cylinders with pulsating fluid pressure. you aims with different resistance to movement to dismantle and in the end you want a far-reaching Uniformization of the state of tension in all Reach wire ropes.

The method described in DE-OS 34 43 889 A1 proved to be usable. But it is without further easy to see that the multitude of separately to be controlled a corresponding cylinders apparatus manufacturing expenditure.

It is now the object of the present invention Creation of a uniform preload over several Simplify wires or other strength members and to make it more cost-effective.

According to claim 1, the desired uniform Preload achieved in that the reinforcement are guided in parallel over a roller, which with a soft surface layer (≦ 90 Shore A). Wires or other strength members with higher Tension dives deeper into it and thus have one shorter bypass and thereby build yours "Overvoltage".

The bias setting is preferably achieved by targeted braking of a (further) roller, the Surface has a coefficient of friction of ≧ 0.2.  

By using only a single brake (otherwise for each wire a brake) with only a single control there is a considerable cost reduction.

Through several series-connected rollers with softer Surface coating can further equalize to be influenced. Slight angular misalignment of the roller Axes can also be compensated for.

By decelerating several Series-connected rollers can be the preload can be set to any height.

It is also possible to design the rollers in such a way that both functions (braked roller with soft support) with one and the same roller can be run simultaneously.

In theory, it even seems possible, all in one Rollers in the plant to be carried out according to this system.

The rollers according to the invention with softer Surface coating causes an evening the tension of the embedded reinforcement.

With the flat belt results himself because of the equalization of the preload Reinforcement insert an improved belt run (Straight running). The otherwise feared bow effect is avoided. The result is less Susceptibility to vibration and thus a better one Noise behavior. Carriage of the uniform contact pattern is to expect a longer service life. All in all this results in a higher dimensional accuracy of the product (Division, tension cord position, neutral level...).  

Comparably advantageous effects and properties arise with timing belts, which were produced with the device according to the invention.

The invention is described in more detail below using an exemplary embodiment. The illustration ( Fig. 1a / 1b) shows the basic illustration - viewed from the side and from the left - of a device for voltage equalization and for adjusting the feed.

Wires 2 a, 2 b, 2 c, coming from a (not shown) coil plate. , , are guided over a first comb 4 and over a first roller 6 , where they are deflected. From the first roller 6 , the wires 2 a, 2 b, 2 c,. , , to a second 8 and a third roller 10 . The contact-wrapping is in each case approximately 180 °. From the third roller 10, the wires reach 2 a, 2 b, 2 c. , , on a second comb 12 , from where the wires 2 a, 2 b, 2 c,. , , be led to the actual belt production.

The rollers 6 , 8 and 10 each have a high frictional resistance on their surfaces and are also each equipped with a brake 14 , 16 and 18 . In order to equalize the wire tensions, the rollers 6 , 8 and 10 are each provided with a soft surface layer 20 , 22 and 24 . The thickness of these surface layers 20 , 22 and 24 is greater than or equal to the wire thickness.

Since the rollers 6 , 8 and 10 in the exemplary embodiment shown are each equipped with a brake 14 , 16 and 18 as well as with a soft surface 20 , 22 and 24 , the two functions (braking and comparing) can be carried out with all rollers 6 , 8 and 10 run equally and simultaneously.

LIST OF REFERENCE NUMBERS

2

a,

2

b

2

c,. , , Wires, reinforcements

4

(first) comb

6

(first) roller

8th

(second) roller

10

(third) roller

12

(second) comb

14

.

16

.

18

brake

20

.

22

.

24

surface layer

Claims (5)

1. Device for the production of belts, in particular flat belts, made of rubber or rubber-like plastics with wire-like or rope-like strength members to be embedded in the longitudinal direction without parallel contact, to be embedded in the rubber or the plastic,
those characterized by at least one roller and can be acted upon by means of pressure means further roller are guided each over at least,
that the strength members ( 2 a, 2 b, 2 c,...) are guided over a single roller ( 6 , 8 , 10 ) which can be acted upon by pressure medium, in which the pressure medium applies braking ( 14 , 16 , 18 ) causes the strength members to be guided over at least one further brakeable roller ( 6 , 8 , 10 ) and
that at least one roller ( 6 , 8 , 10 ) has a surface layer ( 20 , 22 , 24 ) with a hardness of ≦ 90 Shore A. 2. Device according to claim 1, characterized in that the thickness of the surface layer (s) ( 20 , 22 , 24 ) is greater than or equal to the wire thickness to be processed. 3. Device according to claim 1 or 2, characterized in that the surface layer (s) ( 20 , 22 , 24 ) has a degressive characteristic. 4. Device according to one of claims 1 to 3, characterized in that the surface (s) ( 20 , 22 , 24 ) of the roller (s) ( 6 , 8 , 10 ) to be braked has a coefficient of friction of ≧ 0.2. 5. Device according to one of claims 1 to 4, characterized in that all the rollers ( 6 , 8 and 10 ) both brakes ( 14 , 16 , 18 ) and in each case a surface layer ( 20 , 22 , 24 ) with a hardness of ≦ 90 Shore A.