Arrangement for carrying out a two-stage linear movement

Power plants – Pressure fluid source and motor – Pulsator

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60565, F15B 700

Patent

active

053457668

DESCRIPTION:

BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION

The invention relates to an arrangement for carrying out a two-stage linear movement comprising a stationary and a movable constructional unit with an hydraulic cylinder with at least one filling valve and an hydraulic piston, preferably implemented as plunger, having a hollow volume and with a device for building up pressure in the hydraulic cylinder.
With various and diverse machinery it is required that machine parts carry out linear movements. Examples are machine tools, injection moulding machines and robots.
While in some machines it is of primary importance that the movement is carried out rapidly (for example in robots), other machines require primarily large forces.
In the case of injection moulding machines, for example in die clamping devices, the requirements change while the movement is in progress. During closure of the form tool, for example, the movable form half first needs to be moved as rapidly as possible in accordance with a given speed profile, wherein during this movement relatively little force needs to be expended whereupon during the continued movement a large pressure is necessary.
It is generally known that by means of mechanical devices, for example by means of helical drives, and here in particular by means of ball screws fast linear movements can be carried out. On the other hand, high pressure, in particular with hydraulic devices such as with hydraulic piston cylinder units, is achieved.


SUMMARY OF THE INVENTION

It is the task of the invention to create an improved combined mechanical hydraulic arrangement capable of working in a multistage fashion and with which alternatingly fast movements as well as also high pressures can be achieved.


BRIEF DESCRIPTION OF THE DRAWINGS

In the following, various embodiments of the invention will be described in conjunction with the figures of the drawings.
FIG. 1 depicts a schematic axial section through the arrangement according to the invention,
FIG. 2 depicts the same view as in FIG. 1 in a further embodiment of the invention,
FIG. 3 depicts an axial section through the rear area of the arrangement,
FIG. 4 depicts an axial section through an auxiliary cylinder,
FIG. 5 depicts a section through a further embodiment of an auxiliary cylinder
FIGS. 6 and 7 depict details X and Y of FIG. 1, i.e. examples of additional displacement bodies, in section,
FIG. 8 is a graph of the displacement transducer signal in a standard closure process,
FIG. 9 is a graph of the displacement transducer signal with response for form protection, and
FIGS. 10 to 12 each depict an axial section through a further embodiment of the arrangement according to the invention, in different stages of movement.


DESCRIPTION OF THE PREFERRED EMBODIMENT

The essential parts of the arrangement according to the invention are a hydraulic cylinder 1 forming part of a stationary construtional unit, an hydraulic piston 2 implemented as a plunger in the cylinder 1 and having a hollow volume 3, into which projects a plunger piston 4 also disposed in the hydraulic cylinder 1. The plunger piston 4 also comprises a hollow volume into which projects a spindle 6 which is stationary in the housing. The spindle 6 is supported in a carrier plate 9 so as to be rotatable but not axially displaceable by means of a bearing 8, preferably implemented as double bearing 8. The spindle 6 projects into internal screw threads or nut 7 in the plunger piston 4. The plunger piston 4 is moved in the direction of the double arrow 16 of FIG. 1, through the rotation of spindle 6.
In the depicted embodiments, the arrangement according to the invention is used as a closure cylinder of an injection moulding machine. The carrier plate 9 is therefore connected through rods 16 to a movable form die or mould half 17. Form half 17 is guided on bars 18 in the conventional manner.
The plunger piston 4 is therein supported in the rear face plate 10 of the hydraulic cylinder 1 by means of a spring 11 or two spring assemblies 11 so that the plunger piston 4 can be moved towar

REFERENCES:
patent: 3359728 (1967-12-01), Torossian
patent: 4607998 (1986-08-01), Hawkes
patent: 4790234 (1988-12-01), Hampejs et al.
patent: 4932311 (1990-06-01), Mibu et al.
patent: 4961372 (1990-10-01), Hartsberger
International Search Report PCT/AT 92/00003.

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