DE202019103063U1 - Device for tensioning cables - Google Patents

Abstract

Device for tensioning cables, comprising a machine in the manner of a brake (1) comprising a support frame for at least one pair of spools (5a, 5b) on which a cable (3) to be tensioned is rolled up, and at least one machine in the manner of a winch adapted to pull the cable to be withdrawn along the line, characterized in that the spools (5a, 5b) are operatively associated with at least one sensorless electric motor (11).

Description

The subject of the present invention is a device for tensioning cables.

The tensioning of cables, for example cables of electrical or electrified lines, provides the braked extension of the cables by the use of machines with spills.

The devices used are composed of a machine in the manner of a winch designed to pull the cable to be pulled out along the line and a machine in the manner of a brake which applies a predetermined tension to the lines in the extension phase so as to allow them to be suspended on support devices.

In some cases, a helicopter is used to pull the steel cable, thus eliminating the use of the machine in the manner of a winch in such a case.

The same tensioning method is used for laying railway lines, with the winch being replaced by a mobile traction unit.

The cable tensioning devices used to date typically have an oil-hydraulic / mechanical power transmission.

The dynamic braking to be applied to the cable / line is produced by an oil hydraulic motor / pump suitably connected to spools on which the cable / line is rolled up by reduction gears.

The device may or may not be associated with an internal combustion engine / electric motor.

Although the known solutions are widely used today, they are not free from disadvantages.

First and foremost, solutions that provide for the use of internal combustion engines are not really desirable in some applications and locations due to pollutant emissions / noise emissions.

Second, the use of hydraulic oils for oil hydraulic power transmission in the event of leaks can lead to problems of contamination / safety.

In general, there is also some structural complexity of the hydraulic circuits for controlling the brakes and the pumps.

The object of the present invention is to provide a device for tensioning cables which is able to improve the state of the art in one or more of the aspects mentioned above.

Within the scope of this aim, an object of the invention is to provide a device which makes it possible to work in areas where there are restrictions on the use of internal combustion engines / hydraulic oils.

Another object of the invention is to invent a highly reliable cable tensioning device which reduces the likelihood of interference.

This object, as well as these and other objects, which will become more apparent hereinafter, are achieved by a cable tensioning device according to claim 1, optionally provided with one or more features of the dependent claims.

• - 1 eine perspektivische und schematische Ansicht einer Maschine in der Art einer Winde darstellt.

Other features and advantages of the invention will become more apparent from the description of a preferred but not exclusive embodiment of the cable tensioning device of the invention, given by way of example and not limitation in the accompanying drawings, in which:

• - 1 a perspective and schematic view of a machine in the manner of a winch represents.

The cable tensioning device comprises a winch type machine and a brake type machine.

The machine in the manner of a brake 1 includes a support frame for at least a pair of spill ( 5a . 5b) on the one too exciting cable 3 rolled up.

Preferably, the support frame also carries a reel drum 2 ,

The winch-type machine comprises a support frame for at least a pair of spools and for at least one rewinding drum 2 and is adapted to pull the cable to be pulled out along the pipe, and may be a ground-based machine or, for example, a helicopter.

According to the present invention, the pair of spools ( 5a . 5b) the machine in the manner of a brake 1 operatively one or two sensorless electric motor (s) 11 assigned.

In particular, the / are the Spillen ( 5a . 5b) associated electric motor (s) 11 associated with a controller having a sensorless system.

Also the reel drum 2 the machine in the manner of a brake 1 is, if provided, operatively a sensorless electric motor 10 assigned.

Conveniently, the machine, in the manner of a winch, comprises a rewinding drum for an elongated tension member, which is to be tensioned with the cable 3 and a pair of spools operatively associated with one or two sensorless electric motors.

Conveniently, the rewinding drum is assigned to a sensorless electric motor.

In particular, the electric motor associated with the rewinding drum ( 10 . 11 ) associated with a controller having a sensorless system.

The sensorless electric motor (s) is / are connected to a power supply network.

Preferably, a kinematic reduction member is provided between the output shaft of the electric motor ( 10 . 11 ) and the reel drum 2 or the spill ( 5a . 5b) is arranged.

It is also possible to provide a kinematic reduction member disposed between the output shaft of the electric motor and the rewinding drum.

The use of the device according to the invention for tensioning cables is essentially analogous to that of the devices with an oil-hydraulic drive.

In practice, it has been found that the invention fulfills the task and the objectives set.

Thanks to the use of a sensorless electric motor, the control of the torque parameters and speed parameters to 100% of the speed range is effective, without the need for encoders and / or position sensors.

In particular, the sensorless control is able to guarantee a high braking torque at very low speeds up to zero speed without oscillations.

The direct control of torque also ensures rapid and stable control both when changing the loads on the shaft and when changing the speed.

The sensorless control is able to guarantee the same performance of encoder feedback control, but allows for greater plant simplicity, greater reliability, better control and a reduction in the likelihood of interference.

The invention thus conceived may have numerous variations and variants, all of which fall within the scope of the inventive idea; In addition, all details can be replaced by technically equivalent other elements.

In practice, the materials used, as well as the dimensions and non-essential shapes, may be any according to the requirements and the state of the art.

Where the features and techniques mentioned in any claim have been followed by reference numerals, these characters have been added for the sole purpose of increasing the intelligibility of the claims; consequently, these references do not have a limiting effect on the interpretation of each element, which is designated by way of example only with these reference numerals.

Claims (8)

Device for tensioning cables, comprising a machine in the manner of a brake (1) comprising a support frame for at least one pair of spools (5a, 5b) on which a cable (3) to be tensioned is rolled up, and at least one machine in the manner of a winch adapted to pull the cable to be withdrawn along the line, characterized in that the spools (5a, 5b) are operatively associated with at least one sensorless electric motor (11). Device for tensioning cables loud Claim 1 , characterized in that the support frame of the machine in the manner of a brake (1) carries a reeling drum (2) for the cable to be tensioned (3), wherein the reeling drum (2) is operatively associated with a sensorless electric motor (10). Device for tensioning cables according to one or more of the preceding claims, characterized in that the electric motor (11, 10) associated with the spools (5a, 5b) and / or the reeling drum (2) is associated with a control device which has a sensorless system. Device for tensioning cables according to one or more of the preceding claims, characterized in that the at least one machine in the manner of a winch comprises a rewinding drum for an elongated tensioning element, which is connected to the cable to be tensioned, wherein the rewinding drum associated with a sensorless electric motor is. Device for tensioning cables according to one or more of the preceding claims, characterized in that the electric motor, which is associated with the rewinding drum, is associated with a control device which has a sensorless system. Device for tensioning cables according to one or more of the preceding claims, characterized in that the sensorless electric motor (10) is connected to a power supply network. Device for tensioning cables according to one or more of the preceding claims, characterized in that it comprises a kinematic reduction device arranged between the output shaft of the electric motor and the reeling drum (2) and / or the spools (5a, 5b). Device for tensioning cables according to one or more of the preceding claims, characterized in that it comprises a member for kinematic reduction, which is arranged between the output shaft of the electric motor and the rewinding drum.

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