DE102011104665A1 - Press, has drive assembly whose coupling unit, flywheel drive and flywheel motor are replaced by servomotor that is coupled with brake unit of assembly, where motor shaft of servomotor is coupled with drive shaft in translation-free manner - Google Patents

Abstract

The press (1) has a drive assembly whose coupling unit, flywheel drive and flywheel motor are replaced by a servomotor (13) e.g. electric or hydraulic servomotor. The servomotor is coupled to a brake unit (7) of the drive assembly through a drive shaft (11). A motor shaft (14) of the servomotor is connected with the drive shaft in translation-free manner, where the motor shaft and the drive shaft comprise a common rotational axis (d). The brake unit is operated in closed-loop control cooperation with the servomotor.

Description

The invention relates to a press according to the preamble of claim 1.

From the WO 2008/149171 A1 a press is known, which comprises a drive assembly, a press gear, a connecting rod or joint drive and a plunger, wherein the drive assembly comprises a brake unit, a clutch unit, a flywheel drive, a flywheel motor and a drive shaft. According to the WO 2008/149171 A1 this press is retrofitted with a servo drive which acts on the press gear in addition to the flywheel drive driven by the flywheel motor. A disadvantage of such a retrofit of a press is that this results in a high retrofit effort in terms of control technology, since even the existing components, namely the flywheel drive, the flywheel motor and the clutch unit adapted in a satisfactory manner and in accordance with the regulations provided for the servo drive control Need to become. Overall, the retrofitted machine is thus more complex and thus more complex in terms of maintenance and generally error-prone.

It is an object of the invention to provide a press, in which the cost of retrofitting and follow-up costs are limited to a minimum despite the introduction of the latest technology.

This object is achieved on the basis of the features of the preamble of claim 1 by the characterizing features of claim 1. In the dependent claims advantageous and expedient developments are given.

In the press according to the invention, the coupling unit, the flywheel drive and the flywheel motor are replaced by a servomotor, wherein the servomotor is coupled via the drive shaft to the brake unit. Through a complete replacement of the clutch unit, the flywheel drive comprising a flywheel and the flywheel motor, the retrofitting and modernization of a existing press is substantially simplified by the fact that it can be waived to continue to service the old components clutch unit, flywheel drive and flywheel motor and that can be waived to adapt them to the control level of the new servomotor. As a result, in particular a time-consuming installation of sensors can be dispensed with. The core of the invention is to make the press by retrofitting or modernization not only, as usual, more powerful and versatile, but to simplify their structure and thereby achieve a lower probability of failure and a higher availability of the press.

Furthermore, the invention provides, without translation to connect the motor shaft of the servo motor with the drive shaft, wherein the motor shaft and the drive shaft in particular have a common axis of rotation. As a result, can be dispensed with requiring additional components such as a transmission gear.

The invention also provides to coordinate the brake unit and the servo motor control technology, wherein the servo motor is preferably used to convert unneeded, present in the press kinetic energy in particular electrical energy and being slowed down with the brake unit in particular only in an emergency and / or In particular, only that kinetic energy is converted into heat, which exceeds the capacity or braking capacity of the servomotor. This makes it possible to achieve a maximum optimization of the energy balance of the press with the existing components.

According to a first embodiment, the invention provides to form the servo drive as an electric servo drive. By selecting such a servo drive, electrical energy can be fed back into the network or made available to other consumers during braking operation.

According to a second embodiment, the invention provides to form the servo drive as a hydraulic servo drive. The use of a hydraulic servo drive is useful when there are other high-performance hydraulic drive components on the press or on neighboring machines that are dimensioned or loaded so that the retrofitted hydraulic servomotor can also be supplied by an existing hydraulic pump.

Further details of the invention are described in the drawing with reference to schematically illustrated embodiments.

Hereby shows:

1 : A schematic representation of a known from the prior art press with flywheel drive and

2 : a press retrofitted according to the invention.

The 1 shows a schematic representation of a known from the prior art press 1 with flywheel drive 2 , This includes the press 1 a drive arrangement 3 , a press gearbox 4 , a connecting rod or joint drive 5 and a pestle 6 wherein the drive assembly 3 a brake unit 7 , a coupling unit 8th , the mentioned flywheel drive 2 , which is a flywheel 9 includes a flywheel motor 10 and a drive shaft 11 includes. The brake unit 7 is on the drive shaft 11 arranged and the drive shaft 11 drives with a drive gear arranged on it 12 the press gearbox 4 at. This acts via the connecting rod or joint drive 5 , which may alternatively be formed by any other comparable drive, on the plunger 6 , which performs the forming work on a workpiece, not shown.

In the 2 is the one from the 1 well-known press 1 now shown in accordance with the invention converted state. For this purpose, the coupling unit 8th , the flywheel drive 2 and the flywheel motor 10 in the 1 are shown, permanently dismantled and by a servomotor 13 replaced, with the existing brake unit 7 the drive assembly 3 reused and integrated into the new drive concept. The servomotor 13 is now instead of the previous, disassembled components on the drive shaft 11 with the brake unit 7 connected. This is the servomotor 13 with its motor shaft 14 translation-free with the drive shaft 11 coupled, with the motor shaft 14 and the drive shaft 11 have a common axis of rotation d. The servomotor 13 and the brake unit 7 are each with a control unit 15 connected, the two components in their operation by the control unit 15 be coordinated with each other. This is the servomotor 13 from the control unit 15 with regard to the conversion of unneeded, existing in the system kinetic energy preferably used and the brake unit 7 is used only in an emergency and / or to convert those kinetic energy into heat, which is the braking power of the servomotor 13 exceeds. For those in the 2 shown components, which also in the 1 are also available on the description for 1 referenced, wherein in the 2 the corresponding reference numerals are given. In accordance with the 2 converted press 1 includes a drive assembly 16 only the brake unit 7 , the drive shaft 11 and the servomotor 13 ,

The invention is not limited to illustrated or described embodiments. Rather, it includes developments of the invention within the scope of the patent claims.

LIST OF REFERENCE NUMBERS

1

Press

2

flywheel drive

3

Drive arrangement of the original press

4

Press gear

5

Connecting rod or joint drive

6

tappet

7

brake unit

8th

clutch unit

9

flywheel

10

flywheel motor

11

drive shaft

12

drive gear

13

servomotor

14

motor shaft

15

control unit

16

Drive arrangement of the converted press

d

axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2008/149171 A1 [0002, 0002]

Claims (5)

Press ( 1 ) comprising a drive arrangement ( 3 ), a press gear ( 4 ), a connecting rod or joint drive ( 5 ) and a pestle ( 6 ), wherein the drive arrangement ( 3 ) a brake unit ( 7 ), a coupling unit ( 8th ), a flywheel drive ( 2 ), a flywheel motor ( 10 ) and a drive shaft ( 11 ), characterized in that the coupling unit ( 8th ), the flywheel drive ( 2 ) and the flywheel motor ( 10 ) by a servomotor ( 13 ) are replaced, wherein the servomotor ( 13 ) via the drive shaft ( 11 ) to the brake unit ( 7 ) is coupled. Press according to claim 1, characterized in that the servomotor ( 13 ) with its motor shaft ( 14 ) without translation with the drive shaft ( 11 ), the motor shaft ( 14 ) and the drive shaft ( 11 ) in particular have a common axis of rotation (d). Press according to one of the preceding claims, characterized in that the brake unit ( 7 ) in control engineering coordination with the servomotor ( 13 ) is operated such that the servomotor ( 13 ) is preferably used for the conversion of unnecessary kinetic energy and the brake unit ( 7 ) is used in particular only in an emergency and / or converts only that kinetic energy into heat, which the braking or conversion capacity of the servomotor ( 13 ) exceeds. Press according to one of the preceding claims, characterized in that the servo drive ( 13 ) as an electric servo drive ( 13 ) is trained. Press according to one of claims 1 to 3, characterized in that the servo drive ( 13 ) as a hydraulic servo drive ( 13 ) is trained.

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