DE3128111A1 - Process and device for producing V-belts open at the flank - Google Patents

Abstract

The invention relates to a process and a device to enable the production of V-belts which are open at the flank and trapezoidal in cross-section, for example for motor vehicles. V-belts open at the flank are cut out of an already vulcanised coil which is tubular in structure; hitherto this was done on rigid or expandable cutting drums. Expandable or rigid drums therefore had to be held in stock for each V-belt length. According to the present invention, the vulcanised coil is tensioned over two rolls arranged so as to be adjustable axially parallel to one another and is cut to form individual V-belts, it being possible for the rolls to be held either horizontally or else vertically. The cutting operation is carried out by means of circular knives rotating at high speed.

Description

Method and device for the production of open-edged V-belts ================= ============= The invention relates to a method and a device for the production of open-edged V-belts by cutting one on a manufacturing mandrel made from different layers, including reinforcement strands and already vulcanized wraps.

So-called open-flank V-belts are becoming increasingly important, especially for use in motor vehicles and also for industrial use Purposes. Open-flanked V-belts do not need complex devices to be encased. The one made of different rubber layers and the reinforcement inserts existing winding is built on a building drum in the form of a hose and then vulcanized. This is followed by the cutting of the tubular Windings to form individual V-belts with a trapezoidal cross-section.

There are facilities for the production of open-flanked V-belts known, in which the vulcanized winding on a sprayable, on the cylinder jacket with a (; ullulli membrane covered mandrel is pushed. Then is the mandrel spread, i.e. enlarged in diameter and the Cutting process is carried out.

The disadvantages of such expanding mandrels as holding mandrels for implementation of the cutting process consist in particular dari that a mandrel only for a certainii V-belt length range can be used according to its diameter water in the completely retracted state until shortly before the largest mandrel diameter in the spread state.

The individual mandrel segments that bring about the change in diameter are indeed circular; if the thorns are driven into each other, so will the individual pitch circle-shaped segments are raised so that between the segments Create free spaces. Even if the mandrel is surrounded by a thick elastic jacket When the cutting process is carried out, the vulcanized one is pushed away Wikkels at the points where the coil does not go through the segment of the expanding mandrel is supported.

The cutting process must therefore be carried out so that continuously is cut into the elastic pad to make a continuous cut to reach through the wrap. Because of this, for example, the rubber pads be renewed very often, which is very costly. -On the other hand is at Cutting the vulcanized winding into individual V-belts requires high cutting pressure necessary. This results in the use of expanding mandrels with elastic Documents significant difficulties.

It was still vozgeschschlag (DE-OS 30 01 144), for the purpose of achieving of exact cutting conditions for open-flanked V-belts the lap on one To push on a mandrel made of rigid material, to set the mandrel in rotary motion and to cut on the mandrel. In each case between two axial thrust movements After the vulcanized roll, a V-belt is cut from the roll.

Such a method and a corresponding device for Cutting on a mandrel is also shown in DE-PS 20 04 145. From Fig. 4 is a cutting drum and a cutting device can be seen. Such facilities create significantly improved cutting conditions compared to the expanding mandrel on the other hand, these facilities are considered to be the smoke of the spreading dqrn with a considerable amount Disadvantageous.

Both cutting drums can only be used for a fixed V-belt length be, with the expanding mandrel slight changes in length in the expanded or retracted State it allows. So it is not for everyone by opening the expanding mandrel the longer the V-belt length can be measured, a new expanding mandrel is required. Should be open-flanked V-belts of great length are made, so the cost of such a large one Expanding mandrel constructions not justifiable, so that it was not previously possible that Open-flanked flanks which are very inexpensive to produce in terms of the amount of work involved Manufacture of V-belts also in great length.-On the other hand, it is essential to to cut the built-up and vulcanized winding very precisely and evenly, to ensure that the V-belts run smoothly and have a long service life.

It must be emphasized that the cutting of an already vulcanized Windings with reinforcement inserts embedded therein cannot be compared with cutting a not yet vulcanized, very soft roll. Cutting devices for non-vulcanized winding can be made considerably easier because Minimal force is required to cut non-vulcanized rubber is.

In addition, the requirements for the cutting process for V-belts that have not yet been vulcanized with regard to the precision of the cutting process not to overestimate yourself because to some extent during the following Vulkanisiervorganges cutting error, due to the Verforin availability of the not yet vulcanized blank, can be compensated.

If the vulcanization process has been carried out, the blank is no longer deformable. This fact alone makes it clear that the Cutting an already vulcanized roll into individual belts a significantly larger one Precision is required to avoid noise when the V-belt is running, for example as a fan belt in motor vehicles.

The invention is based on the object of a method and a device to create, by means of which also very strongly in length or in its scope distinctive, already vulcanized wraps stretched and cut into individual straps without the disadvantages of the expanding mandrel having to be taken into account and without the use of rigid mandrels that can only be used for a fixed length. There should be the method according to the invention and the device particularly suitable for this the exact cutting of open-flanked V-belts of great length in a particularly advantageous way Way enable.

The AdCabe is by the method laid down in claim 1 in solved in an excellent and extremely simple way, with open-flanked V-belts are obtained, which are formed exactly the same and precise in their external dimensions are a great smoothness and a long service life with the according to the invention produced V-belt achieved.

Facilities that are particularly suitable for carrying out the ore in accordance with the regulations Process suitable are claimed in claims 2 to 8.

> In the characterizing part of claim 2 a device is disclosed, in the case of the two rollers arranged axially parallel to one another and the displaceability one of these rollers is achieved that V-belts of various lengths with it can be asked. By means of the lowerable or pivotable stand parts, which are arranged on one side of the axis of the tension roller, is achieved that after lowering the stand parts of the vulcanized winding from below over both Rollers can be turned inside out. Then the attached to the lowerable stand parts, rotatably mounted cone into a correspondingly cone-shaped, central one The recess in the roller axis is raised and one of the rollers is included their two-sided storage axially parallel to the other, whereby the vulcanized Winding is tensioned. Then the roll is put into circulation and the cutting process carried out.

Carrying out the cutting process in the stretched straight part the revolving winding between the rollers is particularly advantageous because the Circular knives then have the least resistance when moving into the running lap is opposed when cutting in a straight line. In addition, this can the flank angle to be cut must be adhered to exactly.

Cutting on the curve of a spreader drum by means of a powered one Circular knife according to the prior art (the use of a circular knife per se is very beneficial), is very energy-consuming, because the circular Nesser through the flanks of the part already cut on the curve of the expanding drum are strong is braked because the Circular path of the inclined circular knife and the orbit of the V-belt flank slightly cross each other. The edge braking can be so strong that it shows signs of decomposition. Alternatively, however can also be cut by means of a standing knife on one of the rollers.

According to the characterizing part of claim 3, the rollers can be horizontal be arranged to ensure better operability of the system.

I The horizontal arrangement of the rollers also has the advantage of that the entire winding can be divided into individual belts without each after each cut of the winding relaxed by moving a roller and the severed V-belt must be removed from the system. The performance of this facility is thus larger because more cuts can be made per unit of time.

Another advantageous embodiment of the invention is shown in the characterizing Part of claim 4 shown. Required by the vertical arrangement of the rollers the facility takes up considerably less space and must therefore be viewed as very advantageous will.

In claim 5, the embodiment set out in claim 4 is the Invention further developed in an advantageous manner.

A quick and safe solution for the lowerable stand parts from the rollers and safe guidance is achieved through the conical design.

The equipment ßer firmly arranged in the stand rolls with a drive as claimed in claim 6, it is achieved that the drive can also be ordered to be stationary] cann. When the movably arranged roller should be driven, the drive unit would also have to move will. It is therefore particularly advantageous to drive the fixed roller.

According to claim 7, one of the rollers including theirs can alternatively Storage by means of hydraulic cylinders, spindle drives or similar devices be moved axially parallel to the vulcanized winding under high tension to put.

In claim 8, the embodiment set out in claims 2 and 4 is specified further developed in an advantageous manner by the arrangement of a clamping device, which presses the vulcanized winding into the cutting position in order to continuously produce exact, to ensure consistent cutting conditions.

Two devices for the implementation of the invention Process are particularly suitable are explained in more detail in the drawings.

1 shows a side view of a device in which the Roll axes are arranged vertically, Fig. 2 is a plan view of the device according to Fig. 1, Fig. 3 is a side view of a device with horizontal. arranged Rollers, FIG. 4 shows a cutting device for performing the flank cuts.

According to Fig. 1 3 rollers 1 and 2 are vertically arranged in the stand. arranges. Roller 1 is mounted on top in fixed bearing 4 and roller 2 in fixed bearing 5.

At the bottom, roller 1 is attached by means of a lowerable stand part 6 on a piston-cylinder unit 7. Cone 8 is at the top of the stand part 6 and engages in a conical recess 9 of the roller 1.

Roller 1 is moved by means of a drive and gear unit 10 in rotation set.

Roller 2 is designed to be axially parallel to roller 1 so that it can be displaced Hydraulic cylinders 11 and 12, which act on the fixed bearing 5 and on the stand part 13, respectively. The rotatably mounted cone 14 is arranged at the tip of the stand part 13. Piston-cylinder unit 15 lower or raise stand part 13.

In the plan view of FIG. 1 shown in FIG. 2, driven Circular knives 16 and 17 are shown attached to fragholmen 18 and 19, respectively and can be retracted into the orbit of the vulcanized coil 22.

In Fig. 4 circular knives 16, 17 with drive and gear units shown. Arrows 20 and -21 indicate the direction of travel of the circular knives into orbit of the vulcanized winding 22 indicated. The wrap 22 lies on the holding shoe 24 on, which also serves as a counter bearing for performing the cutting process and is attached to carrier 23.

Functioning of the device: In a device shown in FIG. 1 the lowerable stand part is lowered by means of the piston-cylinder unit 7. Roller 1 hangs in its fixed bearing 4.

By means of hydraulic cylinders -11 and 12, roller 2 is moved in the direction of on Roller 1 driven. Then the piston-cylinder unit 15 is actuated and the stand part 13 with attached cone 14 is shut down.

The device is now prepared to receive a vulcanized one Roll 22, which is slipped over rollers 1 and 2 from below. Then stand parts 6 and 13 in the cone-like recesses 9 and 9a for the purpose of counter-bearing the rollers booted.

The wrap 22 rests on shoe 24 (Fig. 4) and is thus in Cutting position. Then roller 2 is moved by means of hydraulic cylinders 11 and 12, so that the winding 22 is tightened.

By drive unit 10, roller 1 is set in rotary motion, as a result of which the tensioned roll 22 rotates and drags roller 2 with it.

Circular knives 16 and 17 are put into operation and in the direction of the roll 22 moves.

In the revolving roll 22 (Fig. 4) is made by means of rotating circular knives 16 and 17 each have a continuous and on the top 22a and bottom 22b very precise cut is generated, the flank cut 25 and the flank cut 25a is performed. Gusset 26 between two V-belts is cut out and is available for regeneration purposes.

After completion of a cut by circular knives 16 and 17 the lap is relaxed by hydraulic cylinders 11 and 12 and the cut one The V-belt is removed down over the old shoe 24.

Thereafter, the remaining roll by means of the Klemmeinrich device 27 pressed down against holding shoe 24. By moving the roller 2 by means of Hydraulic cylinders 11 and 12, winding 22 is put under tension, locking device 27 is solved and the next flank cut can be carried out.

In the device shown in Fig. 3, the rollers 1 and 2 are horizontal arranged. Rolls 1 and 2 are also on one side in this embodiment in fixed bearings, not shown, and on the other hand in detachable and pivotable ones Stator parts 6a and 13a stored.

The mode of operation of this facility is different apart from the following the functioning of the device according to FIGS.

1 and 2 adapted.

All for the division of the entire lap. 22 flank cuts required are carried out without the winding 22 being relaxed in the meantime. First after the entire winding 22 has been cut into individual V-belts, takes place relaxation by actuating a hydraulic cylinder 28, which is attached to the stand part 31 attacks and the finished V-belts are out of the machine after pivoting the Stand parts 6a and 13a removed.

For the purpose of lateral guidance of the roll 22 are guide rollers 29 and 30 of particular advantage in the device according to FIG. 3.

B-E Z U G S Z E I C H E N L I 5 T E ===================================== 1 = roller 2 = roller 3 = stand 4 = fixed bearing 5 = fixed bearing 6 = lowerable stand parts 6a = lowerable stand parts 7 = piston-cylinder unit 8 = cone 9 = conical recess 9a = conical recess 10 = drive and gear unit 11 = hydraulic cylinder 12 = hydraulic cylinder 13 = lowerable stand parts 13a = lowerable stand parts 14 = cone 15 = piston-cylinder unit 16 = circular knife 17 = circular knife 18 = support bar 19 = support spar 20 = arrows 21 = arrows 22 = wrap 22a = top 22b = bottom -23 = carrier for holding shoe 24 = holding shoe 25 = flank cut 25a = flank cut 26th = - gusset 27 = clamping devices 28 = hydraulic cylinder 29 = guide rollers 30 = Guide rollers 31 = stand Blank page

Claims (8)

S S C H U T Z A N- S P R U C H ==== ~ =================== ~ ======= 1. Process for the production of open-flanked V-belts by cutting a a manufacturing facility from different layers including reinforcement strands manufactured and finished vulcanized winding to individual V-belts, since d u r c h g e k e k e nn n n e i c h n e t that the vulcanized winding over two axially parallel Rollers arranged in relation to one another are inverted, pressed against a stop and through axially parallel Shifting one roller is tensioned that the tensioned winding through a Roller is set in circulation, and that from the revolving winding individual V-belts be cut that after the end of the flank cut or the winding is relaxed, and that the cut or the flank-open V-belts from removed from the facility. 2. Device for the production of open-edged V-belts Cutting one on a confection device from different layers incl. Reinforcement strands manufactured and vulcanized to individual wraps finished V-belt by means of a cutting device, characterized in that two rollers (1, 2) are arranged axially parallel to each other, that the axes of the rollers (1, 2) mounted on one side by means of fixed bearings (4, 5) in a stand (3) and on the other side in lowerable or pivotable stand parts (6, 13, 6a, 13a) are formed supported that one of the rollers (1, 2) including their Bearing parallel to the axis of the other roller fixedly arranged in the stand (3) is designed to be displaceable, that one of the rollers (1, 2) is designed to be drivable is, and that the cutting device consisting of drivable circular knives in the orbit of the roll (22) is designed to be movable. 3. Device according to claim 2, characterized in that the rollers (1, 2) are arranged horizontally in a stand (31) (Fig. 3.). 4. Device according to claim 2, characterized in that the rollers (1, 2) are arranged vertically in a stand (3) (Fig. 1 and 2). 5. Device according to claims 2 and 4, d a d u rjc h g e k e n n z e i c h n e t that cones (8, 14) are arranged on the lowerable stand parts (6, 13) are with correspondingly conical, centric recesses (9, 9a) cooperate in the axes of the rollers (1, 2). 6. Device according to claim 2, since you r c h g e k-en n z e i c h n e t that the roller (1), which is fixedly arranged in uprights (3, 31), is designed to be drivable is. 7. Device according to claim 2, characterized in that one of the Rollers (1, 2) by means of hydraulic cylinders (11, 12, 28), spindle drives or the like Devices, axially parallel to the other roller is designed to be movable. 8. Device according to claim 2 and 4, characterized by the arrangement by pressing the vulcanized winding (22) onto the roll shell of the rolls (1, 2), detachable clamping devices (27)