DE102006050298A1 - Drive for a press - Google Patents

Abstract

The present invention relates to the drive for a press, which is designed so that uncontrolled and uncontrollable movements in the region of the tooth stage, which is due to any backlash reduced.

Description

The The present invention relates to the drive for a press having the features of the main claim.

at such presses serve as the primary drive at least a single Electric motor.

This Electric motor acts on the central shaft.

Are common Such presses with a safety brake or plunger lock fitted.

The Safety brake or ram lock communicates with the central shaft.

It should, however, express Be advised that a safety brake or plunger lock not as a prerequisite for the present invention can be seen.

As a result, there is no restriction of the invention to this particular embodiment of a press drive.

Essential is that the torque of the prime mover on at least one gear stage on the eccentric shaft of the press is delivered.

It Object of the present invention, press drives with the above features in such a way that uncontrolled and uncontrollable movements in the area of the gearwheel level caused by any backlash are justified, be reduced.

These Task solves the invention with the features of the main claim.

Out The invention provides the advantage that ground vibrations within the tooth level and thus uncontrollable load changes within the always existing games are avoidable.

consequently By the invention, the operating noise and also the wear of the gear stage reduced.

One Another advantage is that oscillating vibrations also be avoided.

long-term seen, the invention ensures that's usually due to increasing wear over the Life of the gear stage showing gain of the vibration effect is significantly reduced.

This Advantage is achieved in that the drive train between the prime mover and the eccentric shaft of the press in terms of torque so clamped is that all systemic games are avoided.

It are exemplary embodiments specified, in which this effect is also supported by the control technology.

In In this case it is suggested that the further electric motor and the prime mover are switched in master-slave arrangement.

Of the another electric motor with his counter torque generated by him keeps up this circuit always counteracts the torque of the prime mover, so that of the other Elek tromotor predetermined torque of the Torque of the prime mover only overdriven so far can be that the central shaft is spinning, the game of the gear stage but not outdated becomes.

Of the entire powertrain therefore remains throughout the press operation play.

Of the more electric motor therefore serves as the master, while the prime mover is switched as slave.

Becomes the further electric motor operable in both directions of rotation results from this the additional Advantage that in the press cycle of the press of the other electric motor a torque of the prime mover rectified torque can be generated.

Then act both primary drive as well as the further electric motor as regular drive of the press and Nevertheless, the gear stage is always kept free of play.

preferably, is used as a further electric motor, a controllable servo motor.

These measure Serves for easy control of both engines so that a controlled lag always generates the counter torque to the other engines.

Conveniently, let yourself using a hollow shaft motor a backlash-free connection the other electric motor with the eccentric shaft of the press cause.

such Slow-speed motors are also high-pole motors or Torcmotoren known.

A backlash-free connection of such engine with the eccentric shaft of the Press serves the purpose of mostly error-free detection of a rotation signal, e.g. the speed and / or the direction of rotation, which then the controller for primary drive and another electric motor can be abandoned.

For this are embodiments given.

in the The invention is explained in more detail below on the basis of exemplary embodiments:

It demonstrate:

1 a first embodiment of the invention with plunger lock and with countershaft and planetary gear;

2 An embodiment of the invention with safety brake and planetary gear

Provided not otherwise stated below, the following description applies always for all figures.

The Figures show the drive for a press in general form.

An electric motor serves as a prime mover 1 and acts on the central shaft 2 ,

In the embodiment shown the 1 is the central shaft 2 with one here as a ram lock 3 recognizable brake device in connection. In case of 2 it is a spring-loaded safety brake.

It So it can also be a spring-loaded in the braking direction safety brake act.

For this is on referred to the prior art.

Between the prime mover 1 and the eccentric shaft 5 becomes that of the prime mover 1 generated torque via at least one gear stage 4 on the eccentric shaft 5 delivered to the press.

In the embodiment of 1 becomes the gear stage 4 realized by a transfer 4a with a downstream planetary gear 4b ,

The countershaft is realized here by planetary arranged individual electric motors, which are on with the central shaft 2 rotatably connected gear act.

The embodiment of 2 is only the planetary gear 4b shown.

In torque flow direction is here on the central shaft 2 a likewise designed as Torcmotor single motor provided.

These embodiments but do not limit of the invention, they serve only to illustrate the possibilities the invention of both against each other working electric motors, one of which at the entrance and the other should sit at the output of the gear stage.

So it is essential that another electric motor 6 at the output of the gear stage 4 attacks and is controllable such that the torque generated by him 8th is a counter torque, which is the torque 7 of the prime mover 1 is opposite.

The gear stage 4 is therefore always and in all operating positions in a torque biased state in which the clearance between the tooth flanks of the individual teeth of the gear stage 4 is completely switched off.

It is therefore a feature of the invention that torque 7 and counter torque 8th the gear stage 4 Keep under torque tension so that the tooth flanks always touch without play, regardless of the question of whether the gear stage 4 at the moment is in rotation or at a standstill.

For this reason, should be between the electric motor of the prime mover and the other electric motor 6 , which may also be multiple for certain embodiments of the invention, be provided a master-slave circuit.

For this purpose, it is proposed that the further electric motor 6 as master and the prime mover 1 to turn as a slave motor.

This means that the slave can never override the master but one received from the master signal, to keep the drive backlash-free.

So sets the drive for the press in a predetermined direction in motion, the prime mover must also push the other electric motor, if this with a rectified torque 11 on the eccentric shaft 5 acts.

The slave must therefore always the rotational movement of the master in the sense of a game avoidance in the gear stage 4 consequences.

For this purpose it is suggested that the further electric motor 6 in both directions is operable.

Then, in particular, the torque can be 7 of the prime mover 1 and the opposite torque of the further electric motor 6 so controlled that the gear stage 4 starts without play in the pressing cycle and on the other hand still the further electric motor together with the primary drive 1 in the press cycle of the press on the eccentric shaft 5 acting rectified torque 7 . 11 exercises.

Conveniently, the further electric motor 6 equipped as a controllable servomotor.

It should be a Torcmotor, also known as slow running high-pole motor.

In particular, the embodiments show such gate motors as hollow shaft motors, the backlash on the eccentric shaft 5 sitting in the press.

Therefore Such motors are particularly suitable for tapping a faultless Rotation signal.

This is done via the Drehsignalabgriff 9 at the stator of the engine.

The there tapped rotary signal can be present as a speed signal and / or direction of rotation signal and is suitably a controller 10 abandoned giving the control of the prime mover 1 and the further electric motor 6 takes over in the above sense.

1

primary drive

2

central shaft

3

safety brake or plunger lock

4

gear stage

4a

countershaft

4b

planetary gear

5

eccentric shaft

6

Another electric motor

7

Torque of 1

8th

Counter torque of 6

9

Drehssignalabgriff

10

control

11

rectified torque

Claims (12)

Drive for a press with the following components: - at least one electric motor serves as prime mover ( 1 ) and acts on the central shaft ( 2 ); Preferably the central shaft ( 2 ) with a safety brake and / or plunger lock ( 3 ) in connection; - the torque of the prime mover ( 1 ) is connected via at least one gear stage ( 4 ; 4a . 4b ) on the eccentric shaft ( 5 ) delivered to the press; - another electric motor ( 6 ) engages at the output of the gear stage ( 4 ; 4a . 4b ) and is with a torque ( 7 ) of the prime mover ( 1 ) opposing torque ( 8th ) controllable. Drive according to claim 1, characterized in that the further electric motor ( 6 ) and the prime mover ( 1 ) are connected in master-slave arrangement. Drive for a press according to claim 1 or 2, characterized in that the further electric motor ( 6 ) is operable in both directions of rotation. Drive according to claim 3, characterized in that the further electric motor ( 6 ) in the pressing cycle of the press a torque of the prime mover ( 1 ) rectified torque ( 11 ) generated. Drive according to claim 4, characterized in that the torque of the prime mover ( 1 ) entgegenge directed torque is controlled so controlled that the gear stage ( 4 ; 4a . 4b ) runs free of play in the press cycle. Drive according to one of claims 1 to 5, characterized in that the further electric motor ( 6 ) is a controllable servo motor. Drive according to claim 6, characterized in that the further electric motor ( 6 ) is a slow-running Hochpolmotor. Drive according to one of claims 1 to 7, characterized in that the further electric motor ( 6 ) without play with the eccentric shaft ( 5 ) is connected to the press. Drive according to claim 8, characterized in that on the further electric motor ( 6 ) a rotary signal tap ( 9 ) is provided. Drive according to claim 10, characterized in that via the rotary signal tap ( 9 ) the speed is detected. Drive according to claim 9 or 10, characterized in that via the rotary signal tap ( 9 ) the direction of rotation is detected. Drive according to one of Claims 9 to 11, characterized in that the signal from the rotary signal ( 9 ) generated signal of a controller ( 10 ) is given to control the prime mover ( 1 ) and the further electric motor ( 6 ).