EP0138163B1 - Presse à vis - Google Patents

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Publication number
EP0138163B1
EP0138163B1 EP19840111890 EP84111890A EP0138163B1 EP 0138163 B1 EP0138163 B1 EP 0138163B1 EP 19840111890 EP19840111890 EP 19840111890 EP 84111890 A EP84111890 A EP 84111890A EP 0138163 B1 EP0138163 B1 EP 0138163B1
Authority
EP
European Patent Office
Prior art keywords
pressure chamber
housing
screw press
pressure
press according
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.)
Expired
Application number
EP19840111890
Other languages
German (de)
English (en)
Other versions
EP0138163A2 (fr
EP0138163A3 (en
Inventor
Werner Bothe
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 EP0138163A2 publication Critical patent/EP0138163A2/fr
Publication of EP0138163A3 publication Critical patent/EP0138163A3/de
Application granted granted Critical
Publication of EP0138163B1 publication Critical patent/EP0138163B1/fr
Expired 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

Definitions

  • the invention relates to a screw press according to the preamble of patent claim 1.
  • a screw press of this type is known from DE-PS 28 01 139.
  • a piston arranged in a pressure chamber located to the side of the spindle is pressurized with compressed air from an antechamber in order to press a clutch disc connected to the spindle against the flywheel and thereby drive the spindle.
  • the disengagement of the clutch is controlled by an inertial mass which is moved in the axial direction when the spindle decelerates and thereby raises a pilot valve which connects the compressed air supply to the atmosphere, so that the valve piston arranged in the antechamber suddenly lifts off.
  • the pressure chamber can be vented relatively quickly, so that the clutch disengages.
  • the rotating switching mass (inertial mass) is arranged centrally above the front end of the spindle, so that the pressure chamber of the clutch must be designed as an annular space and the corresponding piston as an annular piston.
  • Disadvantages here are the relatively small contact surface with a relatively large diameter and the two seals required for the annular piston.
  • flow channels must be provided from the center of the press to the ring piston, which are relatively expensive and cause a large amount of air friction.
  • the centrally arranged inert mass is difficult to access structurally and can only be adjusted with great difficulty. Because the mass actuates the pilot valve via a displaceable bolt, the switch-off times can change if the bolt is worn.
  • the known screw press also has the disadvantage that the inertial mass of the switching element only takes effect when the spindle slows down, i.e. the clutch begins to slip and the spring deflections in the press have already been reached.
  • the path of the table top and the venting times determine the duration of the frictional engagement and thus the wear of the friction linings, since the switch-off pulse is given after the set torque has been reached.
  • the invention has for its object to provide a screw press of the type specified, with which the disengagement of the clutch can be controlled more precisely while shortening switching time losses.
  • the inertial mass or the mass switch is arranged directly on the tappet, the mass starts to move when the tappet is decelerated at the end of the stroke, i.e. before the full press spring is reached.
  • the mass switch is easily accessible and can be replaced in the event of defects without dismantling a large part of the press.
  • the mass switch controls a pilot valve (quick release valve) arranged in the compressed air line for the pressure chamber of the clutch.
  • This pilot valve in turn controls a large number of quick-release valves arranged in a star shape around the central air inlet into the pressure chamber.
  • the pilot valve and the quick-release valves are thus arranged separately from one another, which has the advantage that very short paths are available for venting the pressure chamber, since the quick-release valves can be arranged directly on the housing surrounding the pressure chamber. Due to the large number of star-shaped quick-release valves, the ventilation is very quick.
  • the air is introduced into the pressure chamber of the coupling via a stationary air inlet socket, the outlet cross-section of which is provided with a check valve (rubber membrane).
  • the nozzle and the associated compressed air line with the pilot valve are arranged stationary, while the quick-release valves arranged on the pressure chamber housing (clutch cover) rotate together with the clutch cover and the flywheel.
  • the compressed air is applied to the quick-release valves from the central air inlet connector via a rotating housing with the quick-release valve connections.
  • the pressure chamber Due to the central arrangement of the pressure chamber above the upper end of the spindle, its housing can be easily assembled or disassembled on the top of the flywheel, so that the clutch disc is very easily accessible.
  • This embodiment makes it possible to arrange the quick-release valves inclined radially outward, so that the valves are kept open by the centrifugal forces acting on the valve pistons.
  • the pressure chamber and the pressure piston are expediently designed such that they have an approximately conical upper boundary wall or a corresponding upper surface, so that the quick release valves are perpendicular to the upper piston surface.
  • the quick release valves themselves are characterized by a particularly simple embodiment that is relatively maintenance-free. They comprise a plug made of rubber-elastic material arranged in a housing, the underside of which is subjected to the pressure of the pressure chamber via housing openings and the top of which is pressurized with the compressed air supplied.
  • the piston When the clutch is engaged, the piston assumes a lower position in which it seals the pressure chamber and the space above the piston from an outlet to the atmosphere arranged laterally in the housing.
  • the plug is moved upward, so that it releases a connection between the pressure chamber outlet and the outlet to the atmosphere.
  • the pilot valve arranged in the compressed air supply line has a structure similar to that of the quick-release valves.
  • a plug made of rubber-elastic material is arranged in a valve housing.
  • the plug is provided with a rod which is guided through the housing cover and to which the power transmission from the mass switch (Bowden cable, flexible steel band, hydraulic column) is connected.
  • the housing is open down to the compressed air line, while it has an outlet to the atmosphere on the side.
  • both the underside and the top of the piston are pressurized with compressed air.
  • the top and bottom surface of the stopper are dimensioned such that the stopper assumes a closed position when compressed air is supplied, in which it seals the compressed air line from the outlet to the atmosphere.
  • the air inlet support is arranged stationary while the pressure chamber housing rotates around the connection piece.
  • a sleeve-shaped housing is arranged around the cylindrical connector, which is connected to the pressure chamber housing and rotates together with it.
  • the rotating housing of the nozzle points to the individual quick-release valves.
  • Compressed air lines which open into an annular channel arranged on the inside of the housing.
  • This ring channel is connected to bores arranged at a distance in the circumferential direction and extending radially through the wall of the air inlet connector. Therefore, if compressed air is supplied via the compressed air line, it is supplied to the quick-release valves via the nozzle, both through the central pressure chamber inlet directly into the pressure chamber and through the bores, the ring channel, the outlets and the individual lines.
  • the spindle press designed in accordance with the invention is provided with a reversing drive with a hydraulic motor (s) and toothed chain and gear wheels, with which high retraction forces can be achieved using the spindle pitch.
  • the screw press 1 shown in FIG. 1 conventionally comprises a frame 2 in which a ram 3 is guided so that it can move up and down.
  • the plunger 3 is carried by a spindle 4 via a spindle nut 5, the spindle nut 5 and thus the plunger 3 being moved downward when the spindle 4 rotates.
  • a reversing drive 6 with a hydraulic motor (s) and toothed chain and gearwheels is provided for the upward movement of the tappet.
  • a bell-shaped flywheel 7 is rotatably mounted about the same axis as the spindle 4.
  • the flywheel 7 can be rotated by a motor (not shown) via a belt drive.
  • a clutch is connected between the spindle 4 and the flywheel 7, with which the spindle can be coupled to the continuously rotating flywheel and, after a certain pressing effect has been achieved, can be uncoupled from the flywheel again.
  • the flywheel 7 is mounted on the press frame 2.
  • a housing 11 On the top of the flywheel 7, a housing 11 is fastened in a suitable manner, which receives a clutch disc 8 arranged at the front end of the spindle 4 and forms a pressure chamber 10 for actuating the clutch, in which a pressure piston 9 is arranged.
  • the pressure chamber has a conical upper boundary surface, and the pressure piston 9 has a correspondingly designed upper surface.
  • the housing is also provided with a central air inlet for the pressure chamber, to which an air inlet connector 12 is assigned.
  • a compressed air line 14 opens into the air inlet connection 12, by means of which compressed air can be introduced into the pressure chamber of the coupling from a suitable source (not shown).
  • the pressure piston 9 is pressurized with compressed air via the compressed air line 14 and the compressed air inlet connection 12.
  • the flywheel is uncoupled from the spindle again, in that the pressure chamber 10 is relieved very quickly via quick-release valves 13.
  • the actuation of the quick-release valves 13 is carried out via a mass switch 18 arranged on the tappet 3 itself, a corresponding power transmission 17 and a pilot valve 15 arranged in the compressed air line 14 and described in detail with reference to FIGS. 2 and 3.
  • the mass switch 18 consists essentially of an inert mass 19, a spring 20 and a permanent magnet (not shown). With a corresponding deceleration of the tappet, there is an axial movement of the inertial mass 19, which is transmitted via a corresponding force transmission (Bowden cable 17) to a lever mechanism 28 for actuating the pilot valve 15. The inert mass 19 is secured against undesirable vibrations by the permanent magnet.
  • the Bowden cable 17 coming from the mass switch 18 is connected to a lever mechanism 28, by means of which the pilot valve shown in detail in FIG. 3 is actuated.
  • the pilot valve 15 takes on compressed air supply via line 14, i.e. when the clutch is engaged or engaged, the position shown in FIG. It comprises a housing 33 arranged on the compressed air supply line 14, the underside of which is open at 35 towards the compressed air line.
  • a plug 36 made of rubber-elastic material, to which a rod 32 is attached, which is guided through the top of the valve housing.
  • the rod 32 communicates with the lever mechanism 28.
  • a channel 38 is formed in the upper side of the housing, via which compressed air can be introduced from the line 14 into the part of the housing located above the plug 36.
  • An outlet 37 leading to the atmosphere is arranged in the side housing wall.
  • the plug 36 which is provided with two control edges, seals the line 14 and the channel 38 from the outlet 37 leading to the atmosphere.
  • the compressed air supplied via line 14 thus enters pressure chamber 10 of the clutch, so that the piston can be acted upon.
  • the upper and lower surface of the plug 36 is dimensioned such that when the upper and lower sides are simultaneously pressurized with compressed air, the piston remains in the position shown in FIG. 3, but only a relatively small force is required to pull the plug from the two seats to take off. This force is applied with a corresponding deceleration of the tappet by the inertial mass 19 and transmitted to the rod 32 via the Bowden cable 17 and the rebel mechanism 28, so that the stopper is lifted off the corresponding seats.
  • the compressed air line 14 is now vented to the atmosphere via the outlet 37, so that the air in the pressure chamber is discharged via quick release valves 13 in the manner described below.
  • electromagnetic valves 18 are provided in the compressed air line, with which an interruption of the compressed air supply can also be achieved.
  • the compressed air line 14, the solenoid valves 16, the pilot valve 15 and the compressed air inlet connection 12 in the pressure chamber are, however, arranged in a stationary manner.
  • the compressed air inlet connector 12 is inserted into a central air inlet of the housing 11 and is mounted on the housing 11 via a sleeve-shaped housing 22 which is arranged in a sealed manner around the cylindrical outer surface of the connecting piece 12.
  • the nozzle 12 has in the air inlet of the pressure chamber leading outlets 25 which are closed by a check valve 26 in the form of a rubber membrane.
  • the essentially hollow-cylindrical connector 12 comprises in its peripheral wall a series of radial bores 27 arranged at a peripheral spacing and penetrating the peripheral wall. These bores 27 open into an annular channel 24 which is formed on the inside of the housing 22 rotating around the connecting piece.
  • An air outlet 29 guided through the housing wall is assigned to each quick-release valve 13.
  • the quick-release valves 13 have a similar structure to the pilot valve 15 and comprise a housing 34, the underside of which is open to the air outlet 29 and in which a rubber-elastic plug 21 is arranged.
  • the top of the stopper 31 is acted upon via the lines 23, while the underside thereof is acted upon by the compressed air located in the pressure chamber 10.
  • the top and bottom of the plug are dimensioned such that the plug remains in the closed position shown in Figure 2 when compressed air is supplied through line 23.
  • the individual quick-release valves are also vented via the connecting piece 12, the annular channel 24 and the lines 23, so that the stopper 31 is suddenly lifted from its seats by the excess pressure now present on its underside and releases the connection between the air outlet 29 and the outlet to the atmosphere.
  • the pressure chamber 10 can therefore blow off very quickly, so that the clutch disengages very quickly.
  • the arrangement of the relatively simple rubber plugs has the advantage that no special guides and no additional sleeves are required, which are exposed to particularly high wear.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Control Of Presses (AREA)

Claims (11)

1. Presse à vis, comportant un volant (7) qui tourne sans interruption dans la même direction, et un accouplement actionné à l'air comprimé, plané entre le volant et la vis, et dont la chambre de pression (10) est alimentée par un conduit d'air pour l'actionnement du piston (9) d'un disque d'accouplement (8); une masse (19) d'inertie, réagissant aux accélérations de la rotation de la vis, et dont le déplacement actionne une vanne de commande initiale (15), disposée sur l'amenée d'air à la chambre de pression, de telle sorte qu'elle met la conduite d'amenée d'air à l'atmosphère, si bien que cela entraîne la commande d'une vanne à air à action rapide pour une décharge brusque de la chambre de pression de l'accouplement, caractérisée en ce que la masse d'inertie (19) est montée directement sur le coulisseau (3) de la presse, en ce que la chambre de pression (10) est disposée de façon centrale au-dessus de la surface frontale supérieure de la vis (4), et en ce qu'une pluralité de vannes à air à action rapide (13) est disposée en étoile autour d'un raccord central fixe (12) d'entrée d'air vers la chambre de pression, l'envoi de l'air comprimé à ladite chambre depuis le raccord d'amenée d'air central se faisant à travers un boîtier (22) tournant sur ce raccord et pourvu de liaison vers lesdites vannes à action rapide.
2. Presse selon la revendication 1, caractérisée en ce que les vannes à action rapide (13) sont inclinées radialement vers l'extérieur.
3. Presse selon la revendication 1 ou 2, caractérisée en ce que le volant (7) est en forme de cloches et vient en recouvrement au-dessus de la traverse supérieure de la presse.
4. Presse selon l'une des revendications précédentes, caractérisée en ce que le carter (11) de la chambre de pression (10) est fixé sur la face supérieure du volant.
5. Presse selon l'une des revendications prédédentes, caractérisée en ce que la chambre de pression (10) a une paroi supérieure de forme à peu près conique, et le piston (9), une face supérieure de forme corresdante.
6. Presse selon la revendication 5, caractérisée en ce que les vannes à action rapide (13) sont disposées perpendiculairement à la surface supérieure du piston.
7. Presse selon l'une des revendications précédentes, caractérisée en ce que les vannes à action rapide (13) sont montées sur des sorties d'air (29) disposées en étoile autour de l'entrée d'air centrale, sur le carter de la chambre de pression, et comprennent un obturateur (31) en matériau élastique de type caoutchouc placé dans un logement (34), dont la face inférieure est soumise à la pression de la chambre de pression et la face supérieure à la pression de l'air comprimé qui lui est envoyé, et qui, lorsqu'il est poussé vers le bas, ferme de façon étanche la liaison entre une sortie d'air à l'atmosphère, disposée latéralement dans le carter, la chambre de pression et l'amenée d'air comprimé.
8. Presse selon l'une des revendications précédentes, caractérisée en ce que la vanne de commande initiale (15) comporte un boîtier ouvert vers le bas sur la conduite (14) d'amenée de l'air comprimé, et dans lequel un obturateur (36) en matériau élastique de type caoutchouc peut être déplacé par une tige (32) guidée à travers le couvercle du boîtier, cette tige étant liée par un moyen convenable de transmission de force au commutateur à inertie (18) relié au volant.
9. Presse selon la revendication 8, caractérisée en ce que la masse d'inertie (19) du commutateur à inertie (18) est reliée à la tige (32) par une transmission Bowden (17) et un mécanisme à levier (28) en vue de la levée de l'obturateur (36) et la décharge de la conduite (14) d'amenée da l'air comprimé.
10. Presse selon l'une des revendications précédentes, caractérisée en ce que le commutateur à inertie (18) est pourvu d'un aimant permanent pour amortir les oscillations de la masse d'inertie (19).
11. Presse selon la revendication 2, caractérisée en ce que les axes des vannes à action rapide font un angle compris entre 90° et 0° avec la surface supérieure du piston.
EP19840111890 1983-10-12 1984-10-04 Presse à vis Expired EP0138163B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833337089 DE3337089C2 (de) 1983-10-12 1983-10-12 Spindelpresse
DE3337089 1983-10-12

Publications (3)

Publication Number Publication Date
EP0138163A2 EP0138163A2 (fr) 1985-04-24
EP0138163A3 EP0138163A3 (en) 1985-10-16
EP0138163B1 true EP0138163B1 (fr) 1987-05-20

Family

ID=6211627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840111890 Expired EP0138163B1 (fr) 1983-10-12 1984-10-04 Presse à vis

Country Status (2)

Country Link
EP (1) EP0138163B1 (fr)
DE (1) DE3337089C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3915860A1 (de) * 1989-05-16 1990-11-22 Beche & Grohs Gmbh Spindelpresse
DE3915859A1 (de) * 1989-05-16 1990-11-22 Beche & Grohs Gmbh Spindelpresse

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1009400A (en) * 1963-02-21 1965-11-10 Hasenclever Ag Maschf Fly-press and method of pressing
US3424185A (en) * 1966-11-15 1969-01-28 Parker Hannifin Corp Quick exhaust valve
DE2110044C3 (de) * 1971-03-03 1979-08-23 Novopress Gmbh Pressen Und Presswerkzeuge & Co Kg, 4000 Duesseldorf Spindelpresse
DE2801139C2 (de) * 1978-01-12 1980-01-24 G. Siempelkamp Gmbh & Co, 4150 Krefeld Spindelpresse
DE2837253C2 (de) * 1978-08-25 1981-09-24 Maschinenfabrik Hasenclever GmbH, 4000 Düsseldorf Spindelpresse
DE3322064C1 (de) * 1983-06-18 1984-10-11 G. Siempelkamp Gmbh & Co, 4150 Krefeld Spindelpresse mit staendig umlaufender Schwungscheibe

Also Published As

Publication number Publication date
EP0138163A2 (fr) 1985-04-24
DE3337089C2 (de) 1986-04-30
EP0138163A3 (en) 1985-10-16
DE3337089A1 (de) 1985-05-02

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