EP2361701B1 - Hydraulic radial pressing device - Google Patents

Description

The invention relates to a pressing device for the radial compression of workpieces, in particular pipes or fittings for pipes.

Pressing devices for radial compression of pipes are known in numerous embodiments. For example, is from the EP 628 362 B1 a pressing tool is known in which the workpiece is surrounded by a closed frame. By a ram, pressure can be exerted on two movable dies within the frame so that they are urged by sliding along V-shaped guide surfaces in a mirror-image motion toward the center of the workpiece.

The WO 02/34427 A1 discloses a hand-operated pressing tool with a handle-like handle, in which a hand-operated hydraulic pump is housed. The handle is connected via a "positioning screw" with a first C-shaped frame part with which a second C-shaped frame part is pivotally coupled. On the inside of these frame parts also movable pressing jaws are mounted. The frame can be placed and closed around a workpiece to be pressed, whereupon one of the pressing jaws is then driven radially inwardly by hydraulic propulsion of a working piston in order to carry out a compression on the workpiece to be machined.

The invention has set itself the task of providing an alternative embodiment of a pressing device, which should be easy to handle especially in the processing of large workpiece diameters for the user.

This object is achieved by a pressing device with the features of claim 1. Advantageous embodiments are contained in the subclaims.

• Einen um das Werkstück legbaren Rahmen, welcher das Werkstück teilweise oder vorzugsweise vollständig umschließen kann.
• Mindestens eine beweglich innerhalb des genannten Rahmens angeordnete Pressbacke, die zur Unterscheidung von optionalen weiteren Pressbacken im Folgenden als "primäre Pressbacke" bezeichnet wird. Unter einer "Pressbacke" ist dabei im Rahmen der vorliegenden Anmeldung allgemein ein Bauteil zu verstehen, das während des Pressvorganges mit einem Werkstück in Kontakt kommt und Presskraft auf das Werkstück überträgt. Typischerweise sind Pressbacken an der Kontaktfläche zu einem Werkstück in bestimmter Weise konturiert, um dem Werkstück eine entsprechende Kontur aufzuprägen.
• Mindestens einen Kolben, welcher in einem mit dem Rahmen gekoppelten Zylinder derart beweglich gelagert ist, dass er unter der Einwirkung eines Hydraulikfluids Druck auf die primäre Pressbacke ausüben kann. Die Ausübung des Druckes kann dabei unmittelbar durch Kontakt des Kolbens mit der primären Pressbacke erfolgen, oder auch mittelbar unter Zwischenschaltung weiterer Komponenten/Bauteile zwischen Kolben und primärer Pressbacke. Des Weiteren soll die Ausübung des Druckes so geschehen, dass die primäre Pressbacke hierdurch in Pressrichtung bewegt wird, d. h. radial einwärts in Bezug auf das Werkstück.

The pressing device according to the invention is used for the radial compression of workpieces, in particular of pipes or Fittirigs on pipes to be joined together. The in principle arbitrarily shaped workpieces should have a central region, to which the external forces acting on the workpiece pressing forces are directed. In this sense, the said region represents a "center" in relation to which the "radial" course of the Compressing is to be understood. The pressing device contains the following components:

• A frame which can be placed around the workpiece and which can partially or preferably completely enclose the workpiece.
• At least one pressing jaw movably arranged within said frame, which is referred to below as "primary pressing jaw" for the purpose of distinguishing between optional further pressing jaws. In the context of the present application, a "pressing jaw" is generally understood to mean a component which comes into contact with a workpiece during the pressing process and transfers pressing force to the workpiece. Typically, pressing jaws are contoured at the contact surface to a workpiece in a certain way in order to impart a corresponding contour to the workpiece.
• At least one piston, which is mounted so movably in a cylinder coupled to the frame, that it can exert pressure on the primary pressing jaw under the action of a hydraulic fluid. The exertion of the pressure can be effected directly by contact of the piston with the primary pressing jaw, or indirectly with the interposition of further components / components between the piston and the primary pressing jaw. Furthermore, the exercise of the pressure should be such that the primary pressing jaw is thereby moved in the pressing direction, ie radially inwardly with respect to the workpiece.

It should be noted that there are no restrictions on the design of "piston" and "cylinder". Thus, in addition to a preferred circular cross-section, both may also have other cross-sectional geometries. It is important only that the cylinder provides a working volume that can be filled by a hydraulic fluid and that is bounded on one side by the piston. A pressure in the hydraulic fluid can be transferred to the piston in this way and set it in motion.

The pressing device described has the advantage that the - typically very high - pressing forces can be transmitted via a hydraulic fluid, since they are converted only at the pressing device itself into a mechanical movement of the pressing jaws. In contrast to known pressing methods, it is thus not necessary to bring a comparatively heavy pressing tongs to the device and to couple them mechanically. This considerably facilitates the handling of the device.

In the invention, the at least one piston and the associated cylinder are arranged in a separate piston carrier, which is reversibly coupled to the frame. When using the pressing device, therefore, the frame can first be applied to the workpiece. After this is done, then the piston carrier can be coupled to the frame, so that then by pressing on the hydraulic fluid, the pressing process can take place. After completion of the pressing, the piston carrier can be released from the frame and the frame removed from the workpiece. By accommodating the piston and cylinder in a separate piston carrier, in this embodiment the weight which is to be handled when applying the frame to a workpiece can be minimized.

In an alternative (not inventive) embodiment of the pressing device, the piston and the cylinder are integrated into the frame. In this way, a very compact pressing device can be realized, in which the total weight of the frame and piston is minimal.

The pressing device preferably includes a quick coupling for coupling a hydraulic supply line to the cylinder. This makes it possible to decouple the usually heavy equipment for generating a sufficiently high hydraulic pressure from the pressing device to create the latter as unhindered as possible to a workpiece can. After positioning the pressing device on the workpiece can then be connected via the quick coupling quickly and easily a hydraulic supply line to supply the energy for the pressing process. At the end of the pressing process, the hydraulic supply line can just as easily be disconnected from the quick-release coupling and the pressing device removed from the workpiece.

There are various possibilities for the arrangement of the primary pressing jaw. In particular, it may be arranged within the frame so that it is displaced by the piston only in the radial direction with respect to the (approximate) center of the frame (corresponding to the central region of a workpiece in the frame). The advantage of this is that the piston and the primary pressing jaw need only perform a simple, rectified linear motion.

The frame of the pressing device may optionally be in one piece. Advantageously, however, the frame consists of several parts that are fixed or hinged together.

In a preferred embodiment, a multi-part frame of the aforementioned type consists of two transverse brackets and two side brackets. Preferably, these four brackets here form a parallelogram, in which the cross brace on the one hand and side brackets on the other face. An advantage of such a frame is that it allows by its construction a symmetrical force application on the workpiece.

In another embodiment of a multi-part frame is provided as a part of the frame, a cross bar, which is pivotally mounted at one end and releasably connected at the opposite end to the next frame part. After releasing the said connection, the frame can then be opened by pivoting the cross bar. This makes it possible, a workpiece such. B. to introduce a long pipe in the frame. After inserting the workpiece, the frame can be closed around the workpiece by reconnecting the crossbar to the next frame part.

In another embodiment of the pressing device, at least one stationary pressing jaw is formed on the frame. This is preferably arranged diametrically opposite the primary pressing jaw, so that the movable primary pressing jaw approaches the stationary pressing jaw during the pressing process.

Furthermore, at least one secondary pressing jaw can be movably mounted on the frame of the pressing device. Preferably, two or more such movable dies are provided, which are arranged symmetrically with respect to a workpiece to be inserted.

The embodiment described above can be further developed in that the primary pressing jaw is in force-transmitting contact with the secondary pressing jaw. In this case, a compact construction can be achieved, since the piston of the pressing device only has to act on the primary pressing jaw, which then transfers the force in a chain to the secondary pressing jaw (s).

In the aforementioned embodiments, optionally, the at least one secondary pressing jaw may be in contact with the primary pressing jaw and / or the frame over operative surfaces such that the secondary pressing jaw is moved radially inwardly with respect to the machined workpiece upon a pressing movement of the primary pressing jaw. In this case, the pressing movement of the primary pressing jaw triggered by the piston is transferred to the movable secondary pressing jaw, whereby a desired (i.e., radially inward-directed) movement of the secondary pressing jaw is produced via suitable shaping of the force-transmitting active surfaces.

In the above case, in particular, effective surfaces can be provided on the secondary pressing jaw, on the frame and on the primary pressing jaw, which are symmetrical with respect to an axis extending transversely to the direction of movement of the primary pressing jaw.

Furthermore, on the frame of the pressing device, a first active surface and on the primary pressing jaw, a further active surface may be formed, which (with respect to an imaginary extension of the active surfaces) form an angle with each other, wherein the intersection of the (extension of) the active surfaces in a radially inwardly directed pressing movement the primary die also moves radially inward. The two active surfaces can thus drive a secondary pressing jaw resting against them quasi radially inwards in front of them. With regard to the geometry of the active surfaces, it should be noted that in the plane of the frame, the active surfaces each define a line and that then said angle and said intersection are formed by these lines.

The invention further includes embodiments in which the frame parts form an open chain which is closed by the movable primary die (i.e., the ends of the chain are connected by the primary die). Such an embodiment has the advantage that it is possible to dispense with a frame part, since its function in the frame part chain is taken over by the primary pressing jaw. This reduces the weight and the manufacturing cost of the pressing device. A particular embodiment of this construction results when the frame includes two side brackets and one cross bar, the side bars being coupled at one end by the cross bar and at the other end by the primary press block.

In another embodiment of the invention, at least two separate (preferably identically formed) piston carriers are present, which can be reversibly coupled with different frame parts (for example, the above-mentioned side bars). By using several separate piston carriers, it is possible to produce high pressing forces without the hydraulic device to be applied being too large and too difficult to handle.

A separate piston carrier can in particular be reversibly coupled to the frame by means of a bolt, the bolt being guided through aligned openings in the frame Piston carrier and put in the frame. In this way, a simple and stable quick coupling can be achieved.

In the embodiment described above, the problem may arise that the bolt lies exactly in the space between the primary pressing jaw and the piston of the piston carrier, thus standing in the way of an immediate effect of the piston on the primary pressing jaw. This can be remedied by the fact that the piston carrier has a movable punch with a slot, the bolt engages through this slot. The punch thus remains movable along the slot and can transmit power from the piston to the die. In this case, the stamp may be formed integrally with the piston or be a separate part.

Fig. 1-3

jeweils eine perspektivische Gesamtansicht einer ersten Pressvorrichtung mit separatem Kolbenträger;

Fig. 4

eine Aufsicht der ersten Pressvorrichtung;

Fig. 5

eine Seitenansicht der ersten Pressvorrichtung;

Fig. 6

einen Schnitt entlang der Linie VI-VI von Figur 5;

Fig. 7

eine separate perspektivische Ansicht einer sekundären Pressbacke der ersten Pressvorrichtung;

Fig. 8

eine separate perspektivische Ansicht eines Seitenbügels der ersten Pressvorrichtung;

Fig. 9

eine separate perspektivische Ansicht des schwenkbaren Querbügels der ersten Pressvorrichtung;

Fig. 10

eine separate perspektivische Ansicht der primären Pressbacke der ersten Pressvorrichtung;

Fig. 11

eine separate perspektivische Ansicht des nicht-schwenkbaren Querbügels der ersten Pressvorrichtung;

Fig. 12-14

jeweils eine perspektivische Gesamtansicht einer zweiten erfindungsgemäßen Pressvorrichtung mit integrierten Kolben;

Fig. 15

eine Aufsicht der zweiten Pressvorrichtung;

Fig. 16

eine Seitenansicht der zweiten Pressvorrichtung;

Fig. 17

einen Schnitt entlang der Linie XVII-XVII von Figur 16;

Fig. 18

eine separate perspektivische Ansicht des nicht schwenkbaren Querbügels der zweiten Pressvorrichtung ohne Kolben;

Fig. 19

eine separate perspektivische Ansicht des nicht schwenkbaren Querbügels der zweiten Pressvorrichtung mit Kolben;

Fig. 20

eine perspektivische Gesamtansicht einer dritten erfindungsgemäßen Pressvorrichtung mit zwei separaten Kolbenträgern;

Fig. 21

eine Aufsicht der dritten Pressvorrichtung;

Fig. 22

einen Schnitt entlang der Linie XXII-XXII von Figur 21;

Fig. 23

eine Seitenansicht der dritten Pressvorrichtung;

Fig. 24

eine separate perspektivische Ansicht eines Kolbenträgers der dritten Pressvorrichtung;

Fig. 25

eine Aufsicht auf den Kolbenträger von Figur 24;

Fig. 26

eine Seitenansicht des Kolbenträgers von Figur 24;

Fig. 27

einen Schnitt entlang der Linie XXVII-XXVII von Figur 26.

In the following, the invention will be explained by way of example with the aid of the figures. Showing:

Fig. 1-3

in each case an overall perspective view of a first pressing device with a separate piston carrier;

Fig. 4

a plan view of the first pressing device;

Fig. 5

a side view of the first pressing device;

Fig. 6

a section along the line VI-VI of FIG. 5 ;

Fig. 7

a separate perspective view of a secondary pressing jaw of the first pressing device;

Fig. 8

a separate perspective view of a side bracket of the first pressing device;

Fig. 9

a separate perspective view of the pivotable cross bar of the first pressing device;

Fig. 10

a separate perspective view of the primary pressing jaw of the first pressing device;

Fig. 11

a separate perspective view of the non-pivoting cross bar of the first pressing device;

Fig. 12-14

in each case an overall perspective view of a second pressing device according to the invention with integrated pistons;

Fig. 15

a plan view of the second pressing device;

Fig. 16

a side view of the second pressing device;

Fig. 17

a section along the line XVII-XVII of FIG. 16 ;

Fig. 18

a separate perspective view of the non-pivoting cross bar of the second pressing device without piston;

Fig. 19

a separate perspective view of the non-pivoting cross bar of the second pressing device with piston;

Fig. 20

an overall perspective view of a third pressing device according to the invention with two separate piston carriers;

Fig. 21

a plan view of the third pressing device;

Fig. 22

a section along the line XXII-XXII of FIG. 21 ;

Fig. 23

a side view of the third pressing device;

Fig. 24

a separate perspective view of a piston carrier of the third pressing device;

Fig. 25

a view of the piston carrier of FIG. 24 ;

Fig. 26

a side view of the piston carrier of FIG. 24 ;

Fig. 27

a section along the line XXVII-XXVII of FIG. 26 ,

In the FIGS. 1 to 11 shows a first embodiment of a pressing device 100 according to the invention for workpieces, for example for the compression of fittings on pipes.

• Einem schwenkbaren ersten Querbügel 110. An seiner Innenseite weist dieser Querbügel 110 eine feststehende Presskontur 111 auf, die während des Pressvorganges mit dem Werkstück in Kontakt kommt. Der erste Querbügel 110 stellt somit gleichzeitig eine feststehende Pressbacke dar.
• Zwei identisch geformten Seitenbügeln 120 und 120', welche spiegelbildlich mit den Enden des schwenkbaren Querbügels 110 verbunden sind. Ein erster Seitenbügel 120 ist dabei über einen lösbaren Verschluss V mit dem schwenkbaren Querbügel 110 gekoppelt, beispielsweise über einen in fluchtenden Bohrungen steckenden Bolzen. Der gegenüberliegende Seitenbügel 120' ist dagegen in einem Drehgelenk G mit dem schwenkbaren Querbügel 110 gekoppelt.
• Einem zweiten Querbügel 150, welcher spiegelbildlich zum ersten, schwenkbaren Querbügel 110 mit den anderen Enden der beiden Seitenbügel 120, 120' in Verbindungspunkten 151 gekoppelt ist (z. B. über Bolzen B).

The pressing device 100 comprises a multi-part frame which encloses a substantially circular working space R for receiving a (round) workpiece. The frame consists of the following parts:

• A pivotable first cross bar 110. On its inner side, this cross bar 110 has a fixed pressing contour 111, which comes into contact with the workpiece during the pressing process. The first cross bar 110 thus simultaneously represents a fixed pressing jaw.
• Two identically shaped side arms 120 and 120 ', which are mirror images of the ends of the pivotable cross bar 110 are connected. A first side bar 120 is coupled via a releasable closure V with the pivotable cross bar 110, for example, via a plug in alignment holes bolt. The opposite side bar 120 ', however, is coupled in a pivot joint G with the pivotable cross bar 110.
• A second cross bar 150, which is mirror-inverted to the first, pivotable cross bar 110 is coupled to the other ends of the two side bars 120, 120 'in connection points 151 (eg via bolt B).

• Eine primäre Pressbacke 140, welche in radialer Richtung (y-Richtung in Figur 4) verschiebebeweglich ist. Eine Sicherung und Führung der primären Pressbacke 140 wird dabei über Langlöcher 142 in der primären Pressbacke erreicht, in welche Stifte 122 des Seitenbügels 120 (bzw. 120') eingreifen. An der dem Werkstück zugewandten Seite hat die primäre Pressbacke eine Presskontur 141.
• Zwei sich symmetrisch gegenüberliegende und beweglich an den Seitenbügeln 120 bzw. 120' gelagerte sekundäre Pressbacken 130 und 130'. Die Sicherung der sekundären Pressbacken erfolgt über Stifte 121 an den Seitenbügeln, die in Ausnehmungen 132 der sekundären Pressbacken eingreifen. Zum Werkstück hin haben die sekundären Pressbacken Presskonturen 131 und 131'.

On the described frame continue pressing jaws are movably mounted, namely:

• A primary pressing jaw 140, which in the radial direction (y-direction in FIG. 4 ) is movable. Securing and guiding the primary pressing jaw 140 is achieved via elongated holes 142 in the primary pressing jaw, in which pins 122 of the side bracket 120 (or 120 ') engage. At the side facing the workpiece, the primary pressing jaw has a pressing contour 141.
• Two symmetrically opposite and movable on the side brackets 120 and 120 'mounted secondary pressing jaws 130 and 130'. Securing the secondary pressing jaws via pins 121 on the side brackets, which engage in recesses 132 of the secondary pressing jaws. The secondary pressing jaws have pressing contours 131 and 131 'towards the workpiece.

The secondary pressing jaws 130, 130 'have on their outer sides effective areas W2 and W3. These work together with corresponding active surfaces W1 on the first transverse bow 110 and W4 on the primary pressing jaw 140 in such a way that the secondary pressing jaws 130, 130 'are pushed radially inwards (positive or negative x-direction in FIG FIG. 4 ), when the primary pressing jaw 140 moves radially inward (positive y-direction in FIG FIG. 4 ). The active surfaces W1-W4 extend at an angle of typically about 35 ° to 55 ° relative to the press axis (y-axis in FIG. 4 ). Furthermore, the active surfaces are preferably located symmetrically to the main axes of the pressing device 100 (x, y axis in FIG. 4 ).

To the pressing device 100 further includes a piston carrier 160. In this two cylinders Z1 and Z2 are formed, in which two pistons K1 and K2 are guided (see. FIG. 6 ). Furthermore, the piston carrier 160 has a quick coupling 161, to which a hydraulic supply line (not shown) can be connected. A hydraulic fluid supplied thereto, e.g. As a hydraulic oil, can then spread over the quick coupling 161 in the cylinder Z1 and Z2 and exert a pressure on the piston K1 and K2, by which they are moved in the y direction.

During a pressing operation, the piston carrier 160 is fixedly arranged in the second cross bar 150, which has a corresponding cavity for this purpose. Furthermore, both the piston carrier 160 and the second cross bar 150 have aligned transverse bores 162 and 152, respectively, through which Bolt (not shown) can be performed to firmly anchor the piston carrier 160 in the second cross bar 150. Alternatively, other mechanisms could be provided for this purpose, such as a bayonet lock or bolting a piston carrier in the second crossbar 150. When the piston carrier is attached to the second crossbar 150, the pistons K1 and K2 push on the primary crimping jaw 140 and move this radially in the direction of the workpiece. As described above, this movement also pushes the secondary pressing jaws 130, 130 'radially inward, resulting in an overall pressing force acting uniformly from all sides on the workpiece.

In practice, various requirements are usually placed on the overpressures to be maintained by a pipe press connection. The higher the requirements, the higher is typically the pressing force to be applied during pressing. It may therefore be advantageous to produce the pressing device 100 in various strongly (stably) designed embodiments, depending on the desired pressing force. Preferably, in this case, the piston carriers 160 and the frame parts 150 of differently designed embodiments are incompatible, so that a lighter frame is not inadvertently coupled with a strong piston carrier or vice versa.

• ein erster, schwenkbarer Querbügel 210;
• zwei Seitenbügel 220 und 220';
• an den Seitenbügeln beweglich gelagerte sekundäre Pressbacken 230, 230';
• eine an den Seitenbügeln verschiebebeweglich gelagerte primäre Pressbacke 240.

In the FIGS. 12 to 19 a second embodiment of a pressing device 200 is shown, in which, in contrast to the first pressing device 100, the hydraulic piston are integrated in the frame. Identical or similar components as in the first pressing device 100 carry in the FIGS. 12 to 19 corresponding, increased by 100 reference numerals and will not be explained in detail below in detail. The components formed identically to the first pressing device include, in particular:

• a first pivotable crossbar 210;
• two side brackets 220 and 220 ';
• on the side brackets movably mounted secondary pressing jaws 230, 230 ';
• a primary pressing jaw 240 displaceably mounted on the side brackets.

In contrast to the first pressing device, on the other hand, the second transverse bow 250 is configured. It does not form a hollow space for receiving a piston carrier, but the cylinder and piston are integrated directly into this transverse bow. Like from the FIGS. 18 and 19 can be seen, three pistons K1, K2 and K3 are provided in the illustrated embodiment, which are guided in corresponding cylinders Z1, Z2 and Z3. These cylinders are formed directly in the material of the second cross bar 250. Furthermore, a quick coupling 261 for a hydraulic supply hose is arranged directly on the second cross bar 250. Through this quick coupling hydraulic fluid can be fed into the working volumes of the cylinder Z1-Z3.

An advantage of the second pressing device 200 with the integrated piston is that it can be made very compact and space-saving, because it can be dispensed with double walls, coupling mechanisms and the like.

• ein schwenkbarer Querbügel 310;
• zwei Seitenbügel 320 und 320';
• an den Seitenbügeln beweglich gelagerte sekundäre Pressbacken 330 und 330';
• eine an den Seitenbügeln verschiebebeweglich gelagerte primäre Pressbacke 340.

In the FIGS. 20 to 27 a third embodiment of a pressing device 300 according to the invention is shown in which, in contrast to the first pressing device, two separate piston carrier 360, 360 'are present, which are reversibly coupled to the frame. Identical or similar components as in the first pressing device 100 carry in the FIGS. 20 to 27 by 200 increased reference numerals and will not be explained in detail below. The components formed identically to the first pressing device include, in particular:

• a pivotable cross bar 310;
• two side bars 320 and 320 ';
• movably mounted secondary pressing jaws 330 and 330 'on the side brackets;
• a primary pressing jaw 340 displaceably mounted on the side brackets.

Unlike the first and second pressing devices, the third pressing device 300 has no second cross bar. Instead, the primary pressing jaw 340 connects the two still free ends of the side bars 320 and 320 '.

Furthermore, the third pressing device 300 has two separate, identically designed piston carriers 360 and 360 ', wherein each of these piston carriers can be reversibly coupled to a free end (which projects beyond the primary pressing jaw 340) of the side brackets 320 and 320'. As in particular from FIG. 22 it can be seen, the coupling of a piston carrier - for example, the piston carrier 360 exemplified below - by means of a bolt 362, which is guided by aligned openings in the associated side bracket 320 on the one hand and in the piston carrier 360 on the other.

The bolt 362 is necessarily located in the third pressing device 300 in the area between the piston K1 and the primary pressing jaw 340. For this reason, the piston carrier 360 includes a movable, in the top view fork-shaped punch 364 (FIG. FIG. 24 ), which is arranged between two cheeks 363 and has a slot or a slot 365 in its arms. Through this slot 365, the bolt 362 can be performed without preventing a (limited) linear movement of the punch 364. The punch 364 may thus transmit motion or force from the piston K1 to the primary die 340.

When using the third pressing device 300, a workpiece to be pressed, such as a fitting, is first introduced into the pressing space R as usual. Then the two piston carriers 360, 360 'are coupled via the bolts 362 and subjected to pressure from a hydraulic supply line (not shown), whereby their pistons K1 move uniformly in the pressing direction. About the punch 364, this movement is transmitted to the primary pressing jaw 340, while at the same time the remaining piston carrier 360, 360 'on the cheeks 363 on the side arms 320, 320' of the Frame "holds". As a result, this results in a movement of the primary pressing jaw 340, which is directed radially inwardly towards the opposing, fixed pressing jaw 310.

As FIG. 21 2, in a radially inward (ie y-directional) movement of the primary pressing jaw 340, the secondary pressing jaws 330 and 330 'are also driven radially inwardly (x-direction for these pressing jaws). This is done by the active surfaces W1 standing at an angle α to one another on the transverse bow 310 or W4 on the primary pressing jaw 340, the (imaginary) point of intersection of these active surfaces also moving radially inward during a radial inward movement of the primary pressing jaw 340 (ie in x-direction). Direction in FIG. 21 ).

Claims (14)

1. Pressing device (100, 200, 300) for the radial pressing of workpieces, containing:

   - a frame (110, 120, 120', 150; 210, 220, 220', 250; 310, 320, 320') capable of being laid around the workpiece;

   - at least one primary press jaw (140, 240, 340) which is arranged movably inside the frame and which can be applied to the workpiece during the pressing operation;

   - at least one piston (K1, K2, K3) which is movably mounted in a cylinder (Z1, Z2, Z3) coupled to the frame, in such a way that the said piston can exert pressure upon the primary press jaw under the action of a hydraulic fluid,

   characterized in that the piston (K1, K2) and the cylinder (Z1, Z2) are arranged in a piston carrier (160, 360, 360') which can be coupled reversibly to the frame (150, 320, 320') for each pressing operation.
2. Pressing device (300) according to Claim 1,
   characterized in that the frame parts form an open chain which is closed by the primary press jaw.
3. Pressing device (100, 200, 300) according to at least one of the preceding claims,
   characterized in that it contains a quick-action coupling (161, 261, 361) for coupling a hydraulic supply line to the cylinder (Z1, Z2, Z3).
4. Pressing device (100, 200, 300) according to at least one of the preceding claims,
   characterized in that the primary press jaw (140, 240, 340) is arranged such that it is displaced by the piston (K1, K2, K3) solely in the radial direction with respect to the centre point of the frame (110, 120, 120', 150; 210, 220, 220', 250; 310, 320, 320').
5. Pressing device (100, 200, 300) according to at least one of the preceding claims,
   characterized in that the frame consists of a plurality of parts (110, 120, 120', 150; 210, 220, 220', 250; 310, 320, 320'), in particular of two transverse shackles (110, 150, 210, 250) and two side shackles (120, 120', 220, 220').
6. Pressing device (100, 200, 300) according to Claim 5,
   characterized in that the frame has a transverse shackle (110, 210, 310) which is mounted pivotably at one end (G) and which is connected releasably at the opposite end (V) to the nearest frame part (120, 220, 320).
7. Pressing device (100, 200, 300) according to at least one of the preceding claims,
   characterized in that at least one secondary press jaw (130, 130', 230, 230', 330, 330') is mounted movably on the frame (120, 120', 220, 220', 320, 320').
8. Pressing device (100, 200, 300) according to Claim 7,
   characterized in that the primary press jaw (140, 240, 340) is in force-transmitting contact with the secondary press jaw (130, 130', 230, 230', 330, 330').
9. Pressing device (100, 200, 300) according to Claim 7 or 8,
   characterized in that the secondary press jaw (130, 130', 230, 230', 330, 330') is in contact with the primary press jaw (140, 240, 340) and/or with the frame (110, 210, 310) via active surfaces (W1, W2, W3, W4) in such a way that, during a pressing movement of the primary press jaw, the secondary press jaw is moved radially inwards.
10. Pressing device (100, 200, 300) according to at least one of the preceding claims,
    characterized in that a first active surface (W1) is formed on the frame (110, 210, 310) and a further active surface (W4) is formed on the primary press jaw (140, 240, 340), these active surfaces forming an angle (α) with one another, and the intersection point of the active surfaces moving radially inwards during a pressing movement of the primary press jaw.
11. Pressing device (300) according to at least one of the preceding claims, characterized in that the frame contains two side shackles (320, 320') which are coupled by means of a transverse shackle (310) and by means of the primary press jaw (340).
12. Pressing device (300) according to at least one of the preceding claims, characterized in that at least two separate piston carriers (360, 360') are present, which can be coupled reversibly to different parts (320, 320') of the frame.
13. Pressing device (100, 300) according to at least one of the preceding claims,
    characterized in that at least one piston carrier (160, 360, 360') is present, which can be coupled to the frame (150, 320, 320') by means of a bolt (162, 362).
14. Pressing device (300) according to Claim 13,
    characterized in that the piston carrier (360, 360') has a movable plunger (364) with a slot (365) through which the bolt (362) can engage.

Images