EP0474995A2 - Presse à vis - Google Patents

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Publication number
EP0474995A2
EP0474995A2 EP91110719A EP91110719A EP0474995A2 EP 0474995 A2 EP0474995 A2 EP 0474995A2 EP 91110719 A EP91110719 A EP 91110719A EP 91110719 A EP91110719 A EP 91110719A EP 0474995 A2 EP0474995 A2 EP 0474995A2
Authority
EP
European Patent Office
Prior art keywords
spindle
press
screw
hydraulic
thrust bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91110719A
Other languages
German (de)
English (en)
Other versions
EP0474995A3 (en
Inventor
Karl Hermann Claasen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beche and Grohs GmbH
Original Assignee
Beche and Grohs GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beche and Grohs GmbH filed Critical Beche and Grohs GmbH
Publication of EP0474995A2 publication Critical patent/EP0474995A2/fr
Publication of EP0474995A3 publication Critical patent/EP0474995A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
    • B30B1/188—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means driven by a continuously rotatable flywheel with a coupling arranged between the flywheel and the screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means

Definitions

  • the invention relates to a screw press with a press frame, a plunger which can be actuated by a spindle, a device for moving the plunger back and an upper track bearing which interacts with the spindle.
  • Screw presses of this type have already become known in various configurations. In this regard, reference is made to the applicant's earlier applications such as P 39 15 859, P 40 20 465, P 39 35 787 and P 39 15 860.
  • a continuously rotating flywheel is coupled to the spindle.
  • the then rotating spindle moves the plunger downwards via an interposed spindle nut.
  • the clutch is maintained until the nominal force is reached and then released.
  • a reaction force arises in the press frame, since the spindle is loaded with a compressive force and tries to move upwards.
  • an upper track bearing arranged above the spindle nut is provided in the press frame. This thrust bearing prevents the spindle from moving upwards during the forming load.
  • the reaction force at the upper track bearing of the spindle increases significantly. Even if precautions are taken to release the coupling when the nominal force of the press is reached, in practice this does not always occur with the desired precision. It can lead to another Braking the flywheel and / or the clutch grinding.
  • the nominal force of the press is exceeded, in practice values up to 2.5 times the nominal force can occur.
  • such high forces cannot be used as planned, as the press is only designed for the nominal force. It is problematic to exceed the nominal force in this way, especially in the case of so-called bumps. Frequent exceeding of the nominal force without timely release of the clutch leads to heavy wear, especially in the clutch but also on the thrust bearing and the spindle. There is even a risk of breakage on the spindle, the spindle nut and the frame.
  • the object of the invention is to provide a screw press of the type specified at the outset, which is less sensitive to exceeding the nominal force or in which exceeding the nominal force is practically impossible.
  • the pressure preload in the hydraulic volume is kept comparatively low, for example in the range from 5 to 10 bar. It only serves to safely fill the volume.
  • the relief valve can be set to 400 bar, for example. If the maximum force of the press is exceeded, the pressure in the hydraulic volume can rise to 400 bar, then hydraulic fluid is sprayed out of the hydraulic volume. The pressure in the hydraulic volume accordingly does not exceed the specified pressure, for example 400 bar. Hosing hydraulic fluid reduces the hydraulic volume relatively strongly. This can be used to enable the thrust bearing to move vertically upwards. In practice, the movement of the thrust bearing and thus the permissible movement of the spindle can be, for example, 5-10 mm.
  • Another preferred embodiment of the invention proposes that the coupling between the spindle and the flywheel can be triggered by the permitted vertical movement of the thrust bearing or the spindle. This vertical movement, which occurs when the nominal force is reached, is used at the same time to release the coupling of the spindle with the flywheel. This can ensure that the nominal force is not significantly exceeded.
  • the measure of releasing the coupling by an approved vertical movement of the spindle during a forming process when the maximum force of the spindle press is exceeded is also of sole importance, that is to say without the measure of providing a hydraulic volume associated with the thrust bearing.
  • a vertical mobility of the thrust bearing can also be achieved by a Cushioning can be realized with a mechanical spring.
  • the movement of the spindle can be detected in various ways in order to release the clutch between the spindle and the flywheel.
  • an actuating cam is arranged on an end face of the spindle and connected thereto. This actuating cam can trigger a switch against which it moves when the spindle moves.
  • the switch also preferably moves against a hydraulic valve. When the clutch is actuated hydraulically, this valve can be switched such that it immediately releases the pressure chamber of the clutch actuation, so that the pressure drops and hydraulic fluid flows out of the pressure chamber, for example.
  • a switch or a circuit trigger can also be connected to the movement of the track bearing.
  • the upper part of the spindle is longitudinally movable relative to a clutch disc.
  • a hub, which supports the clutch disc, is therefore provided, for example, with a counter-stop to the upper area of the press frame.
  • a screw press 1 with a plunger 2, which can be moved by means of a spindle 3 to carry out a forming process.
  • the lowered plunger 2 (see FIG. 2) can be moved back into its starting position by means of a hydraulic cylinder 4.
  • the spindle 3 can be coupled to the flywheel 7 via a coupling 6.
  • the force or energy for moving the tappet 2 is obtained from the flywheel 7 during the shaping process.
  • the spindle 3 is mounted in a spindle nut 5 which is received in the plunger 2. Furthermore, the spindle 3 is supported by means of a thrust bearing 9. The spindle 3 with the spindle nut 5 and the plunger 2 are all received in a press frame 8.
  • the flywheel 7 rotates in the same direction of rotation. After or shortly before the end of the working stroke, the clutch 6 between the flywheel 7 and the spindle 3 is released and the upward movement of the tappet 3 is carried out by means of the hydraulic return stroke device (hydraulic cylinder 4) mentioned.
  • a space for a hydraulic volume 10 is formed above the track bearing 9 (see also FIG. 3).
  • This hydraulic volume can also be referred to as a hydraulic cushion.
  • the configuration is such that the track bearing 9 can move into the space of the hydraulic volume 10 in the absence or decrease of the hydraulic volume 10.
  • the hydraulic volume 10 is by a Supply line 11 fed. Hydraulic fluid can be dispensed or sprayed out of the hydraulic volume 10 via the relief valve 13.
  • the relief valve 13 is adjustable to a certain pressure. With a 1000 t press, this pressure is set to 400 bar, for example. In general, the pressure is adjusted so that there is no hosing down to a little above the pressure in the hydraulic volume, which corresponds to reaching the maximum press force for a given screw press.
  • the hydraulic volume is slightly compressed by the load up to this pressure, which also causes the thrust bearing to move upwards. This movement, before hydraulic fluid is sprayed off, is very slight and only moves in the range of a few tenths of a millimeter.
  • a practical value for the movement that the track bearing 9 can perform, for example, is in the range from 5 to 10 mm in the example of a 1000 t screw press.
  • Hydraulic fluid with sufficient pressure is expediently constantly present in the supply line 11. As soon as an overloading process has ended or, as will be explained in more detail below, the clutch is released and corresponding relaxation occurs, the hydraulic volume 10 is refilled until the initial volume is reached again.
  • the movement of the spindle is further used in the exemplary embodiment to release the clutch between the flywheel and the spindle. This is shown in detail, although schematically, in FIG. 4.
  • An actuating cam 15 is arranged on the upper end face 14 of the spindle 3. This actuating cam 15 interacts with the hydraulic valve 16 when the spindle 3 moves.
  • the hydraulic line 17 that comes from the clutch cylinder (not shown in detail) 18 is closed (compare, for example, FIGS. 1 and 2).
  • the valve 16, or more precisely its switching cam 18, is actuated, the hydraulic valve is switched over to passage. The pressure chambers of the hydraulic cylinders 18 of the clutch 6 are thus suddenly relieved, so that the clutch drops off suddenly.
  • the construction in the upper area of the spindle 3 is adapted in such a way that vertical movement of the spindle 3 is otherwise possible without impairing the screw press.
  • the spindle 3 is provided such that it can move vertically with respect to the clutch disc 19.
  • the clutch disc 19 is supported by an upper hub 20 as a counter stop, so that it does not follow the movement of the spindle 3 when it occurs in the vertical direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Control Of Presses (AREA)
EP19910110719 1990-09-12 1991-06-28 Screw press Withdrawn EP0474995A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904028886 DE4028886A1 (de) 1990-09-12 1990-09-12 Spindelpresse
DE4028886 1990-09-12

Publications (2)

Publication Number Publication Date
EP0474995A2 true EP0474995A2 (fr) 1992-03-18
EP0474995A3 EP0474995A3 (en) 1992-08-26

Family

ID=6414078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910110719 Withdrawn EP0474995A3 (en) 1990-09-12 1991-06-28 Screw press

Country Status (2)

Country Link
EP (1) EP0474995A3 (fr)
DE (1) DE4028886A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2346563A1 (de) * 1973-09-15 1975-03-20 Edelhoff Werkzeugmasch Spindelpresse
DE2758973B1 (de) * 1977-12-30 1979-03-29 Siempelkamp Gmbh & Co Spindelpresse
DE3102665A1 (de) * 1981-01-28 1982-08-12 G. Siempelkamp Gmbh & Co, 4150 Krefeld Spindelpresse mit staendig umlaufender schwungscheibe
JPH02108495A (ja) * 1988-10-17 1990-04-20 Sumitomo Heavy Ind Ltd スクリュプレスの過負荷防止装置
EP0375888A2 (fr) * 1988-12-23 1990-07-04 Bêché & Grohs GmbH Presse à vis

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB515519A (en) * 1938-05-31 1939-12-07 Booth Walters Improvements in or relating to screw presses
DE2150726C3 (de) * 1971-10-12 1979-10-11 Novopress Gmbh Pressen Und Presswerkzeuge & Co Kg, 4000 Duesseldorf Spindelpresse
DE2318965C2 (de) * 1973-04-14 1984-09-20 Langenstein & Schemann GmbH, 8630 Coburg Steuervorrichtung einer Spindelpresse mit einer Kupplung zwischen Spindel und Schwungrad
DE2366599C2 (de) * 1973-04-14 1986-06-12 Langenstein & Schemann GmbH, 8630 Coburg Betätigungsvorrichtung der Kupplung einer Spindelpresse mit Überlastsicherung
DE8334163U1 (de) * 1983-11-29 1985-09-05 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Spindelpresse mit einer Überlastsicherung
DE3505933A1 (de) * 1985-02-21 1986-08-21 Langenstein & Schemann GmbH, 8630 Coburg Steuervorrichtung eines entlastungsventiles einer umformmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2346563A1 (de) * 1973-09-15 1975-03-20 Edelhoff Werkzeugmasch Spindelpresse
DE2758973B1 (de) * 1977-12-30 1979-03-29 Siempelkamp Gmbh & Co Spindelpresse
DE3102665A1 (de) * 1981-01-28 1982-08-12 G. Siempelkamp Gmbh & Co, 4150 Krefeld Spindelpresse mit staendig umlaufender schwungscheibe
JPH02108495A (ja) * 1988-10-17 1990-04-20 Sumitomo Heavy Ind Ltd スクリュプレスの過負荷防止装置
EP0375888A2 (fr) * 1988-12-23 1990-07-04 Bêché & Grohs GmbH Presse à vis

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 323 (M-997)11. Juli 1990 & JP-A-2 108 495 ( SUMITOMO HEAVY IND. LTD. ) 20. April 1990 *

Also Published As

Publication number Publication date
DE4028886A1 (de) 1992-03-19
EP0474995A3 (en) 1992-08-26

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