METHOD FOR OPERATING A COMBINED CLUTCH- AND BRAKE DEVICE OF A PUNCH PRESS

Abstract

The invention relates to a method for operating a combined clutch and brake device (5) of a punch press (1) equipped with dry friction linings (7, 8). Thereby, the friction linings (7, 8) are arranged in a chamber (R) which is sealed off from the environment of the punch press (1), and which is filled with a dry and oil-free gaseous medium, in particular with dry oil-free air. This effectively prevents moisture and oil mist from entering the region of the friction linings from the environment of the press, and a constant friction coefficient can be achieved over the mechanical service life of the friction linings.

Claims

1. A method for operating a combined clutch and brake device of a punch press equipped with dry friction linings, wherein the friction linings are arranged in a chamber which is sealed off from the environment of the punch press and is filled with a dry and oil-free gaseous medium, in particular with dry and oil-free air.

2. Method The method according to claim 1, wherein the chamber with the gaseous medium is put under an overpressure.

3. The method according to claim 1, wherein the gaseous medium is set in motion in the chamber, in particular circulated.

4. The method according to claim 1, wherein dry and oil-free gaseous medium is supplied to the chamber and discharged from the chamber permanently, intermittently or under-specific operating conditions.

5. The method according to claim 4, wherein medium is discharged from the chamber into the environment of the punch press.

6. The method according to claim 4, wherein air is drawn in from the environment of the punch press, is cleaned, dried and/or d-oiled by means of a treatment device and is then supplied to the chamber.

7. The method according to claim 4, wherein the clutch and brake device is arranged together with the punch press in a closed soundproofing booth and air is drawn in from the environment of the soundproofing booth and supplied to the chamber.

8. The method according to claim 4, wherein the gaseous and substantially dry and oil-free medium is supplied to the chamber from a reservoir.

9. The method according to claim 4, wherein the chamber is part of a circuit in which, during the intended operation, the gaseous medium which is discharged from the chamber is subjected to a treatment and is subsequently supplied back to the chamber.

10. The method according to claim 9, wherein the gaseous medium discharged from the chamber is cooled before it is supplied back to the chamber.

11. The method according to claim 9, wherein the gaseous medium discharged from the chamber is dehumidified and/or de-oiled before it is supplied back to the chamber.

12. The method according to claim 9, wherein the gaseous medium discharged from the chamber is purified, in particular filtered, before it is supplied back into the chamber.

13. A combined clutch and brake device for carrying out the method according to claim 1, with dry friction linings for transmitting the drive and brake torques, wherein the friction linings are arranged in a chamber which is sealed off from the environment of the punch press and which is filled or can be filled with a dry and oil-free gaseous medium, in particular with dry oil-free air.

14. The clutch and brake device according to claim 13, wherein the device is designed in such a way that the chamber can be pressurized with the medium during the intended operation.

15. The clutch and brake device according to claim 13, wherein the device comprises means, in particular internal ventilation blades, with which a movement, in particular a circulation, of the gaseous medium in the chamber can be generated during the intended operation.

16. The clutch and brake device according to claim 13, wherein the chamber has supply and discharge openings via which, during the intended operation, gaseous medium can be supplied to the chamber and discharged from the chamber permanently, intermittently or under certain operating conditions.

17. The clutch and brake device according to claim 16, further comprising an air treatment device by means of which, during the intended operation of the device, air can be drawn in from the environment of the punch press, cleaned, dried and/or de-oiled and can then be supplied to the chamber.

18. The clutch and brake device according to claim 16, wherein the clutch and brake device together with the punch press is arranged in a closed soundproofing booth and devices are present by means of which, during the intended operation, air can be drawn in from the environment of the soundproofing booth and supplied to the chamber.

19. The clutch and brake device according to claim 16, further comprising a reservoir for the gaseous and substantially dry and oil-free medium from which it can be supplied into the chamber.

20. The clutch and brake device according to claim 16, wherein the chamber is part of a circuit in which the gaseous medium can be circulated during the intended operation.

21. The clutch and brake device according to claim 20, wherein means are arranged in the circuit for treating the gaseous medium circulated therein during the intended operation.

22. The clutch and brake device according to claim 21, wherein cooling means are present in the circuit for cooling the gaseous medium circulated therein during the intended operation.

23. The clutch and brake device according to claim 21, wherein dehumidifying and/or de-oiling means are present in the circuit for dehumidifying and/or de-oiling the gaseous medium circulated therein during the intended operation.

24. The clutch and brake device according to claim 21, wherein cleaning and/or filtering means are present in the circuit for cleaning and/or filtering the gaseous medium circulated therein during the intended operation.

25. A punch press with a clutch and brake device according to claim 13.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Further preferred embodiments of the invention are apparent from the dependent claims and from the now following description with reference to the figures. Thereby show:

[0032] FIG. 1 a first punch press according to the invention in a rear view;

[0033] FIG. 2 a vertical section along the line A-A in FIG. 1;

[0034] FIG. 3 the detail X from FIG. 2;

[0035] FIG. 4 a second punch press according to the invention in a rear view;

[0036] FIG. 5 a vertical section along the line B-B in FIG. 4;

[0037] FIG. 6 the detail Y from FIG. 5;

[0038] FIG. 7 a third punch press according to the invention in a rear view;

[0039] FIG. 8 a vertical section along the line C-C in FIG. 7; and

[0040] FIG. 9 the detail Z from FIG. 8.

DETAILED DESCRIPTION

[0041] FIG. 1 shows a first punch press 1 according to the invention in the rear view. The press 1 comprises a press structure 2 with a machine table and a press ram operating against the machine table, which is driven by an electric motor 3 via a belt drive 4 and a combined clutch and brake device 5 according to the invention with flywheel 6.

[0042] The press 1 is arranged in a closed soundproofing booth, of which only a section of a side wall 15 is shown.

[0043] FIG. 2 shows a vertical section through the clutch and brake device 5 according to the invention. As can be seen in conjunction with FIG. 3, which shows the detail from FIG. 2 enlarged and without the belt cover 19, the flywheel 6 of the clutch and brake device 5 as well as its friction linings 7, 8 are arranged in a housing 9, the boundary walls of which are formed by the machine housing 10 of the press 1, an adjoining sealing housing 11 and a cover 12 for the flywheel 6.

[0044] The cover 12 has a supply port 13 for clean dry air on its upper side and is passed through centrally in the axial direction by the belt pulley 14 for the drive belt (not shown), thereby forming a narrow sealing gap S between the belt pulley 14 and the cover 12 (see FIG. 3). Otherwise, the housing 9 is hermetically closed and thus forms a chamber R sealed off from the environment of the punch press 1, in which the flywheel 6 together with the friction discs and the friction linings 7, 8 of both the brake group and the clutch group are arranged.

[0045] As can be seen in FIG. 1, clean and dry air is drawn in from the environment of the soundproofing booth by means of an axial fan 16 in the side wall 15 of the soundproofing booth and supplied to this chamber R via an air duct 17 and the supply port 13.

[0046] As can be seen in particular from the arrows shown in FIG. 3, it meets a deflector plate 18 there, which ensures that the main part of the air is directed into the area between the machine housing 10 and the flywheel 6, i.e. where the brake group is arranged. The air then flows around the clutch and brake device 5 and enters the belt cover 19 via the narrow sealing gap S formed between the belt pulley 14 and the cover 12, from where it flows into the direction of the drive motor 3 and then escapes into the environment. Because the sealing gap S is the only opening through which the air can escape from the chamber R, the outflowing air volume and the overpressure in the chamber R can be set via its flow cross-section and via the operating parameters of the axial fan 16.

[0047] If the air in the vicinity of the soundproofing booth is contaminated with dust, moisture and/or oil mist, the axial fan 16 is followed by devices for appropriate treatment of the air drawn in (filtering/dehumidifying/de-oiling), which the air must pass through before it is supplied to the chamber R.

[0048] The FIGS. 4, 5 and 6 show illustrations, like the FIGS. 1, 2 and 3, of a second punch press 1 according to the invention. This differs from the one shown in the FIGS. 1 to 3 in that here, the gap between the belt pulley 14 and the cover 12 is closed with a seal 20 and the cover 12 has a connection port 21, 13 each on both its upper side and its lower side, the lower of which serves as a supply port 13 and the upper as a discharge port 21. The two connection ports 13, 21 are connected via an air duct 17, in which a cooling device 22 with a circulation fan and with a filter is arranged, which, during the intended operation, draws heated air out of the chamber R via the upper connecting piece 21, cools and filters it and then blows it back into the chamber R via the lower connection port 13. In this way, the chamber R is part of a circuit in which the air circulates during the intended operation and is cooled and filtered.

[0049] The FIGS. 7, 8 and 9 show illustrations like the FIGS. 1, 2 and 3 of a third punch press 1 according to the invention. This differs from the one shown in the FIGS. 1 to 3 in that here the gap between the belt pulley 14 and the cover 12 is closed with a seal 20 and the cover 12 has no supply port 13. The chamber R therefore has neither supply nor discharge openings and is completely sealed off from the environment of the punch press.

[0050] As can be seen in the FIGS. 8 and 9, here, the flywheel 6 has a large number of fan blades 23 on its side facing the brake group, which ensure that the air present in the chamber R circulates and flows along the inner wall of the cover 12, thereby dissipating heat to it. For better heat dissipation, the cover 12 has a plurality of cooling fins 24 on its outer circumference.

[0051] While preferred embodiments of the invention are described in the present application, it should be clearly noted that the invention is not limited thereto and may be carried out in other ways within the scope of the now following claims.