DE7726770U1 - PRESS - Google Patents

Description

JR.-ING. DIPI ING. M. έ <ί. J, "*, _c (OtPL. ^ PHYS. Df ?. _t DIPL.-PHVS.

HÖGER - STELLREQ'hIT 4- ¹ G Rl ESS BACH - HAECKER

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PATENT LAWYERS IN STUTTGART

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April 12, 1977

company

Hermann Haulick

Eutinger Strasse

7530 Pforzheim

Press

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The invention relates to a press with a frame which has an upper table supporting the press eccentric and a press table has supporting lower part, which by means of tie rods extending in the direction of the press stroke against one another are braced, the tie rods being attached to a first of the two frame parts and adjustable along the tie rods Wear abutment elements against which areas of the second frame part facing away from this frame part are supported.

If known eccentric presses by punching or the like are blocked in the bottom dead center and can no longer be broken loose by the natural »moment of inertia, so has this results in very cumbersome and time-consuming dismantling work. This is where the invention comes in, which has the task egrundelag to reduce the effort in a press of the type mentioned, which is necessary to the im bottom dead center to make the blocked press ready for operation again. To solve this problem are according to the invention between the abutment elements and the adjacent frame sections insertable spacers as well as the abutment elements lifted from the spacers pressure medium piston units intended. If now a press according to the invention is blocked in the bottom dead center and it does not succeed in the To raise the press ram by the inherent moment of inertia, the piston assemblies are pressurized so that the spacers become free and can be removed. Then the piston units are relieved, which results has that the parts of the press frame are no longer braced against each other, which is why it is then possible to move the eccentric

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drove rait help of self swing torque through the bottom dead center to driver · Then the piston units are again subjected to such Lruck - that can insert the distance pieces can be relieved of pressure after which the piston units.

The construction according to the invention is particularly simple, when the piston assemblies that can be acted upon by the pressure medium are integrated into the abutment elements. Therefore wise in a preferred embodiment of the invention, the abutment elements each have a body with a pressure medium space on, in which a pressure medium-operated piston is guided displaceably in the longitudinal direction of the tie rod. When the piston then supported next to the spacer belonging to the abutment element on the second frame part and sufficiently far has been extended, the spacer, which is preferably a split washer, can be can be easily removed.

The abutment elements can be very diverse act suitable construction parts, but the easiest way is to design the abutment elements and the tie rods, if the abutment elements than on threaded sections of the tie rods Screw-on nuts are formed into which pressure medium spaces for the pistons can be worked without further ado leave.

So that all tie rods are evenly loaded or relieved, it is advisable to use one of all pressure fluid piston units Provide common pressure medium pump, with a hand-operated

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The pump is completely sufficient.

A press designed according to the invention is therefore extremely user-friendly; the pressure medium system is however also maintenance-free, as the piston units are pressure-free during normal press operation. Another benefit is in öer achievement of a high press rigidity in the direction of force flow to see, so that, since only the spacers are removed to break loose the blocked press ram must, the otherwise usual / or mechanical overload protection or release devices in the plug can be dispensed with "Elastic" links in the power flow are not advantageous for automatic punching machines because they shorten tool life have as a consequence. Because these links are omitted, the ram is lighter in a press according to the invention, which in turn results in a more favorable behavior of the machine.

Further features, advantages and details of the invention emerge from the attached claims and / or from the following description and the accompanying drawings of a preferred embodiment of the invention; show it:

Figure 1 is a schematic view of a press embodying the features of the invention;

Fig. 2 shows the upper part of the press frame obliquely from above, and

3 shows a section through the upper end of a tie rod with a hydraulic nut according to the invention.

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The eccentric press shown in Fig. 1 basically has a conventional structure, so that it is not necessary is to describe them in detail. It has a press frame designated as a whole with 10 with a press table 12 supporting lower part 14 and an upper part 16 receiving the eccentric drive, between which an intermediate frame part 18 is arranged. A ram that can be moved up and down by the eccentric drive was finally designated by 20.

The three frame parts are fastened to the frame base via four / tie rods 22 and four Tie-rod nuts 24 are braced against one another in the longitudinal direction of the tie-rod, and with reference to FIGS Formation of the nuts 24 screwed onto a threaded section 22a of the tie rods will be explained in more detail.

An annular channel 26 is worked into each of the nuts 24 at the bottom, and an annular piston 28 can be displaced between its side walls is led. The space remaining above the annular piston in the annular channel 26 forms a chamber 30, which has a Bore 32 hydraulic oil can be supplied. Lines 36 are connected to the upper ends of the bores 32 of all nuts 24, which lead to a simple high-pressure hand pump 38, with the aid of which the chambers 30 are charged with hydraulic oil and can be relieved of pressure again.

Between the undersides of the tie-rod nuts 24 and the upper part of the frame 16 of the press, split washers 40 are finally inserted, next to which the annular pistons 28 are located on the upper part of the frame 16 can support.

During assembly, the tie-rod nuts 24 are first tightened,

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whereupon, by operating the hand pump 38, the annular piston 28 is extended and thereby all four tie rods at the same time and are evenly tensioned and the press frame 10 is placed under pretension. The amount of preload to be maintained is determined by the washers 40 to be inserted between the anchor nuts 24 and the upper frame 16, which are divided and ground to the desired preload dimension. After inserting the washers, the E / hydraulic circuit the hand pump 38 can be relieved of pressure again.

Now blocked the press by incorrect punching or the like in the bottom dead center of the press ram 20 and this can are not driven through the bottom dead center by the natural moment of inertia, only one actuation is required the hand pump 38, bi 'all washers 40 are free and can be removed, whereupon the chambers 30 and thus the Ring piston 28 of anchor nuts 24 are relieved of pressure. In this way, the pre-tensioning of the tie rods 22 is eliminated and thus the bracing of the press frame, so that it is possible to to move the plunger 20 through the bottom dead center due to the inherent moment of inertia. Then only the Hand pump 38 can be actuated in order to be able to reinsert the washers 40 and so make the press ready for operation again close.

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Claims (7)

A 42 290 b ·. / J ..: ': .. ί! ..:' b - 163 April 12, 1977 - 1 - ■ -t Claims: 1. Press with a frame, which has an upper and a press table supporting the press eccentric Has lower part which braced against each other by tie rods extending in the direction of the press stroke are, wherein the tie rods are attached to a first of the two frame parts and along the tie rods wear adjustable abutment elements against the areas facing away from this frame part of the support the second frame part, characterized by between the abutment elements (24) and the adjacent ones Frame areas (areas of the upper frame part 16) insertable spacers (40) and the abutment elements Pressure medium piston unit lifting off the spacers (26,28,30). 2., press according to claim 1, characterized in that the abutment elements (24) have a body with a pressure medium space (30) in which a pressure medium actuator KoIten (28) in the longitudinal direction of the tie rods (22) is slidably guided. 3. Press according to claim 2, characterized in that the pressure medium space (30) is a to the respective tie rod (22) at least approximately concentric annular space and the piston is designed as an annular piston (28). 4. Press according to one or more of the preceding claims, characterized in that the abutment elements 7726770 12/08/77 ι A 42 290 b '., ",.' '.,' ',,' b - 163
April 12, 1977 - 2 - are designed as nuts (24) which can be screwed onto threaded sections (22a) of the tie rods (22). 5. Press according to one or more of the preceding claims, characterized by all pressure medium piston units common, preferably hand-operated pressure medium pump (38). 6. Press according to one or more of the preceding claims, characterized in that the abutment elements (24) on the top of the frame upper part (16) are arranged. 7. Press according to one or more of the preceding claims, characterized in that the spacers are washers (40). 7726770 12/08/77