WO2002024374A1

WO2002024374A1 - Radial press

Info

Publication number: WO2002024374A1
Application number: PCT/EP2001/009983
Authority: WO
Inventors: Friedrich Ertl
Original assignee: Uniflex-Hydraulik Gmbh
Priority date: 2000-09-22
Filing date: 2001-08-30
Publication date: 2002-03-28
Also published as: DE10047025A1; DE10047025C2

Abstract

The invention relates to a radial press having a housing (1), an annular guiding body (4) which is arranged around the press axis (12), and an outer pressure ring (11) surrounding the guiding body (4) and positioned around the press axis (12) in a rotational manner. Said guiding body (4) comprises a plurality of openings (6) in which sliders (7) can be radially moved. Said sliders are coupled to the pressure ring (11) by means of transmission elements which convert the rotation (B) of the pressure ring into radial movements (A). The transmission elements are in the form of wedges, the pressure ring (11) comprising a number of beveled wedges (13) on the radial inner surface thereof which correspond to the number of sliders (7).

Description

radial press

The present invention relates to a radial press with a housing, an annular guide body arranged around the press axis and an outer pressure ring surrounding the guide body and rotatably mounted about the press axis, the guide body having a plurality of openings in which slides are guided in a radially displaceable manner , which are coupled to the pressure ring via its rotation in radial movements converting gear.

A radial press of the type mentioned above is known from DE 3331721 C2. Each of the sliders is connected to the pressure ring via a link, each link being articulated on both the slide and the pressure ring. This results in a toggle-type gear arrangement between the pressure ring and the slides.

The known radial press of the generic type has not proven itself in practice. The decisive factor here is that the handlebar arrangements - with practical dimensions of the radial press - are not suitable for transmitting the high pressing forces required in modern radial presses. Because, if the press stroke is to meet the usual requirements, they must be of relatively slim design due to their construction, so as not to impede the opening of the radial press.

From EP-A-0451417 a radial press is known which has a housing comprising two halves, four slides being radially displaceable in each housing half C5 OJ rl φ 1

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Words in that each of the slides is assigned a wedge bevel arranged on a radial inner surface of the pressure ring, wherein "wedge bevel" in the sense of the present invention means that the surface in question is not arranged on a circular path concentric to the press axis, but rather that the surface the "wedge bevel" increasingly approaches the press axis over a certain angle of rotation. If the pressure ring is rotated, the slides are moved synchronously radially inwards via the associated wedge gears, the wedge bevels of the pressure ring sliding on the slides.

Various geometries can be used to design the bevel. According to a first development of the invention, it is particularly preferred that the wedge bevels are designed as circular arc segments arranged eccentrically to the press axis. In connection with this development of the invention, the slides particularly preferably each comprise a base body and a pressure piece bearing on the associated wedge slope of the pressure ring, the contour of the pressure pieces being limited by two circular arc segments, one of which is flat on the associated wedge slope of the pressure ring and the other the other lies flat against a concave counter surface of the associated base body. The pressure piece can be rotated within the shell-like counter surface of the associated base body of the slide. This enables the pressure piece to lie flat against the associated wedge slope of the pressure ring during the entire pressing process. Since the pressure piece lies flat against both the wedge bevel of the pressure ring and the base body of the slide, the corresponding dddd CQ 1

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which can be simple. In this case, the two plates of the housing (see above) can also be comparatively small and therefore light. The drive devices are particularly preferably designed as linear drives with mutually parallel directions of action. This, in turn, is favorable with regard to driving the pressure ring free of transverse forces.

According to another preferred development of the invention, the linear drives are connected to the pressure ring via tension bands which rest on guide surfaces of the pressure ring. In this sense, in particular, each linear drive can be connected to the pressure ring via two tension bands in the form of a rope loop, the pressure ring each having a groove extending in the circumferential direction between the two associated guide surfaces. The guide surfaces are particularly preferably designed in the form of circular arc segments whose center of curvature lies on the axis of rotation of the pressure ring, the linear drives being rigidly connected to the housing. Due to the circular arc-shaped design of the guide surfaces, which is concentric with the press axis, the tangential application of force from the linear drives to the pressure ring via the tension bands is always on the same line of action, which enables the rigid connection of the linear drives to the housing. This allows, in particular, that the linear drives are designed as inexpensive plungers. The pistons dip into the groove that extends in the circumferential direction between the two associated guide surfaces in the pressure ring. In this way, the two drawstrings of each rope loop and the associated piston of the linear drive can be in the same plane lie, which in turn is particularly favorable with regard to the suppression of lateral forces.

According to yet another preferred development of the invention, the pressure ring is constructed from two ring disks and a number of wedge pieces corresponding to the number of slides, which are arranged between the two ring disks. This enables cost-effective production of the pressure ring with high precision of the geometry of the wedge bevels. In the context of the present invention, however, any other suitable structure of the pressure ring is also considered, for example its manufacture as a gray cast iron part, which is machined only on the force application surfaces.

Another preferred development of the invention is characterized in that a number of press jaws corresponding to twice the number of slides is provided. In this case, a press jaw is mounted in a stationary manner in each slide, and the other press jaws are each slidably supported on two adjacent slides on guide surfaces. In this sense, if the number of slides is (only) half as large as the number of press jaws, this enables the slides to be dimensioned accordingly, which proves to be favorable in the sense of a robust design of the radial press according to the invention. The arrangement of the guide surfaces results directly from the number of slides or press jaws. If four slides are provided for eight press jaws, the two guide surfaces of each slider form an angle of 135 ° with one another.

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Press jaw is assembled from a base jaw and a press head attached to this.

The present invention is explained in more detail below with reference to two preferred exemplary embodiments illustrated in the drawing. It shows

1 is a perspective view of a first embodiment of a radial press according to the present invention,

Fig. 2 is a perspective view of a modification of the tool used in the radial press of FIG. 1 and

3 shows a press jaw set used in the tool for use in the radial presses according to FIGS. 1 and 2.

1 comprises a housing 1, which is essentially composed of two plates 2 and two panels 3. Only the two plates 2 are essential for the power transmission. The linings 3 can thus be produced inexpensively and easily, for example by manufacturing them from a thin-walled sheet metal.

A guide body 4 is fixedly connected to the housing 1. This is formed by four segments 5, which are firmly connected to the two plates 2 of the housing and keep them at a distance. Each two adjacent segments 5 define an opening 6 between them, in each of which a slide 7 is radially displaceable (double arrow A). Each slide consists of a base body 8 and a pressure piece 9. The pressure pieces 9 each lie on one

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connected to the housing 1, namely the two plates 2 of the housing. At the end of the piston rod 18 of each plunger 17, a saddle part 19 is arranged, around which a rope loop 20 is placed. The two free ends 21 of the rope loop 20 are fixed on the pressure ring 11. Each of the two tension bands 22 of the rope loop 20 rests on a guide surface 23 of the pressure ring 11 which extends in the circumferential direction, the guide surfaces 23 being designed in the form of circular arc segments whose center of curvature lies on the press axis 12. Between the two guides 23 assigned to each cable loop 20 there is a groove 24 which extends in the circumferential direction and into which the piston rod 18 of the assigned plunger 17 is immersed. The two drawstrings 22 of each rope loop 20 are in this way in their free areas not lying on the guide surfaces 23 of the pressure ring 11 in the same plane as the piston rod 18 of the associated plunger 17, the two corresponding planes assigned to the two plungers 17 relative to one another run in parallel.

A reset element 25 in the form of a double-acting hydraulic cylinder 26 is provided for opening the press. This acts between the cylinder of one of the plungers 17 on the one hand and the pressure ring 11 on the other. Alternatively, the hydraulic cylinder 26 could directly engage the housing 1, for example one of the plates 2, or another component fixed to the housing. When acted upon appropriately, the hydraulic cylinder 26 also serves as a rapid drive for rapid closing of the press until shortly before the start of the force pressing via the linear drives 16. x: o

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secure hold of the press jaw set within the tool.

Claims

Expectations

1. Radial press with a housing (1), an annular, around the press axis (12) arranged around the guide body (4) and an outer, the guide body (4) surrounding the press axis (12) rotatably mounted pressure ring (11), wherein the guide body (4) has a plurality of openings (6), in which slides (7) are guided in a radially displaceable manner and are coupled to the pressure ring (11) via its rotation (B) which converts the transmission into radial movements (A), characterized in that that the gears are designed as wedge gears in that the pressure ring (11) has on its radial inner surface a number of wedge bevels (13) corresponding to the number of slides (7).

2. Radial press according to claim 1, characterized in that the wedge bevels (13) are designed as eccentric to the press axis (12) arranged circular arc segments.

3. Radial press according to claim 1 or claim 2, characterized in that the slide (7) each comprise a base body (8) and a pressure piece (9) bearing against the associated wedge bevel (13) of the pressure ring (11).

4. Radial press according to claim 3, characterized in that the contour of the pressure pieces (9) is limited by two circular arc segments, one of which is flat on the associated wedge bevel (13) of the pressure ring (11) and the other is flat on a trough-like counter surface ( 10) of the associated base body (8).

5. Radial press according to claim 4, characterized in that the base body (8) facing circular arc segment has a greater curvature than the circular ring segment (11) facing each pressure piece (9).

6. Radial press according to one of claims 1 to 5, characterized in that the housing (1) comprises two plates (2), between which the guide body (4) and the pressure ring (11) are arranged, the guide body (4) with the two plates (2) are firmly connected.

7. Radial press according to one of claims 1 to 6, characterized in that in the housing (1) two diametrically opposite, counter-rotating on the pressure ring (11) acting drive devices are mounted.

8. Radial press according to claim 7, characterized in that the drive devices as linear drives (16) are designed with mutually parallel directions of action.

9. Radial press according to claim 8, characterized in that the linear drives (16) are connected to the pressure ring (11) via tension bands (22) which bear against guide surfaces (23) of the pressure ring (11).

10. Radial press according to claim 8 or claim 9, characterized in that each linear drive (16) with the pressure ring (11) via two drawstrings (22) in the form of a rope loop (20) is connected, the pressure ring (11) between the two assigned guide surfaces (23) each has a groove (24) extending in the circumferential direction.

11. A radial press according to claim 9 or claim 10, characterized in that the guide surfaces (23) are designed in the form of circular arc segments, the center of curvature of which lies on the axis of rotation of the pressure ring (11) defined by the press axis (12), the linear drives ( 16) are rigidly connected to the housing (1).

12. Radial press according to claim 11, characterized in that the linear drives (16) are designed as plungers (17).

13. Radial press according to one of claims 1 to 12, characterized in that the pressure ring (11) is composed of two ring disks (28) and a number of wedge pieces (29) corresponding to the number of slides (7), which are arranged between the two ring disks (28).

14. Radial press according to one of claims 1 to 13, characterized in that one of twice the number of slides (7) corresponding number of press jaws (30) is provided.

15. Radial press according to claim 14, characterized in that in each slide (7) a press jaw (30) is mounted in a fixed position and that the remaining press jaws (30) are each slidably supported on two adjacent slides (7) on guide surfaces (27).

16. Radial press according to claim 14 or claim 15, characterized in that spreading springs (37) are arranged in each case between two adjacent pressing jaws (30).

17. Radial press according to one of claims 1 to 16, characterized in that spreading springs (31) are arranged in each case between two adjacent slides (7).

18. Radial press according to one of claims 1 to 17, characterized in that one of the slides (7) acts on a sensor.

19. Radial press according to one of claims 1 to 18, characterized in that an active restoring element (25) acts between the pressure ring (11) on the one hand and the housing (1) or a component firmly connected thereto on the other hand.

20. Radial press according to one of claims 1 to 18, characterized in that a passive return spring acts between the pressure ring (11) on the one hand and the housing (1) or a component firmly connected to this on the other.

21. Radial press according to claim 20, characterized in that the return spring is designed as a gas pressure spring.

22. Radial press according to one of claims 1 to 21, characterized in that the press jaws (30) are made in one piece, each comprising a base jaw and an integrated press head.