Press system

Abstract

The present invention relates to a press tool and press ring for pressing a press fitting. The press tool includes two press jaws movable relative to one another from an open position to a closed position for pressing, the press jaws including connecting elements for connecting to respective receiving elements of a press ring, the press ring being movable from the open position to the closed position by movement of the press jaws for pressing the press fitting. A minimum spacing of the connecting elements in the open position is greater than a maximum spacing of the receiving elements of the press ring in the open position, and a minimum spacing of the connecting elements in the closed position corresponds to a minimum spacing of the receiving elements of the press ring in the closed position. Furthermore, the minimum spacing of the connecting elements in the open position is less than a maximum spacing of the receiving elements of a second press ring in the open position, preventing connection to the second press ring.

Description

Technical Field

[0001] The present invention relates to a press tool (pressing tool) for pressing a press fitting by means of a press ring, such a press ring, and a set including the press tool and the press ring.

Background Art

[0002] When pressing a press fitting (press-fitting part), particularly the connection of tubular parts by cold forming, it is known from, for example, Patent Document 1, to use a press ring. The press ring has at least two segments which are connected to each other in a hinge-like manner. The press ring is connected to a press device (pressing device) by means of a press tool (by pressing), and a mechanical pressing force is applied to the press ring by the press device, enabling the press fitting to be pressed. In particular, this is an electro-hydraulic press device, and the press jaws of the press tool are moved towards each other, and the movement of the press jaws is transmitted to the press ring to close the press ring, as a result of which the inner diameter of the press ring is reduced and the press fitting in contact with the inner diameter of the press ring is pressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document Ⅰ

Summary of the Invention

Problems to be Solved by the Invention

[0004] Press rings come in different inner diameters, each suited to a specific press fitting. Press tools must also be fitted to the respective press ring or press die. On the one hand, this fit must be geometrically correct; that is, the closing distance of the press tool must match the closing distance of the press ring. On the other hand, the press tool must be able to transmit the closing force necessary to close the press ring on the press fitting. For example, using a press tool that is geometrically too large may result in incomplete closure of the press ring, insufficient pressing force on the press fitting, and a press defect. Conversely, using a press tool that is geometrically too small may result in pressing force exceeding the closure point of the press ring, potentially leading to damage or even breakage of the press ring or press fitting.

[0005] For example, if a press tool with insufficient closing force is used, an incomplete press may occur because the press tool switches off at its maximum pressing force before the press ring is fully closed.

[0006] If the press tool applies too much pressure, it can put excessive stress on the press ring, potentially damaging or breaking the press ring or press fitting.

[0007] The object of the present invention is to provide a press tool, a press ring, and a set of a press tool and a press ring that can prevent damage and incomplete pressing.

[0008] The object of the present invention is achieved by the press tool described in claim 1, the press ring described in claim 5, the set described in claim 9, and the system described in claim 10. [Means for solving the problem]

[0009] A first aspect of the present invention relates to a press tool for pressing a press fitting (press-fit portion) with a press ring. The press tool has two press jaws that are movable relative to each other from an open position to a closed position for pressing, particularly by a drive mechanism. Furthermore, the press jaws are provided with connecting elements for connecting to the respective receiving elements of the press ring, and the press ring can move from an open position to a closed position for pressing the press fitting by the movement of the press jaws.

[0010] According to the present invention, the minimum distance between connecting elements in the open position is greater than the maximum distance between receiving elements of the press ring in the open position. Therefore, the press tool according to the first aspect of the present invention can be connected to a press ring because the minimum spacing between connecting elements in the open position is greater than the spacing between each receiving element. Thus, the press jaws of the press tool can be opened wide enough to connect the press tool to the press ring.

[0011] Furthermore, the minimum distance of the connecting elements in the closed position corresponds precisely to the minimum distance of the receiving elements of the press ring in the closed position. This ensures that the press tool according to the first aspect of the present invention can close the press ring, and thus optimal pressing of the press fitting is achieved.

[0012] Furthermore, the minimum spacing of the connecting elements in the open position is smaller than the maximum spacing of the receiving elements of the second press ring in the open position, thus preventing connection to the second press ring. Similarly, the minimum spacing of the connecting elements in the press tool according to the first aspect of the present invention in the open position is smaller than the maximum spacing of the receiving elements of the second press ring in the open position, so it is impossible and therefore excluded to connect the press tool according to the first aspect of the present invention to the second press ring. In other words, the press tool according to the first aspect of the present invention cannot open wide enough to connect to a mismatched second press ring. This prevents incorrect pressing or damage / breakage of the press tool or press fitting.

[0013] Preferably, the connecting element is formed by a spherical segment or a segment similar to a sphere. In this case, the spherical segment can engage with a correspondingly formed spherical recess in the receiving element. The spherical segment has the advantage that, due to its rotational symmetry, the press ring and the press tool can be connected to each other at different angles. This improves manageability, in particular, because the press tool can be used with the press device at an angle to the press ring.

[0014] Preferably, the connecting element is designed as an undercut for connecting to a connecting bolt of the press ring. In particular, if the press ring is designed as a press collar, the receiving element can be designed as a connecting bolt, which can be inserted into the undercut of the connecting element to connect a press tool to the press ring.

[0015] Preferably, the press tool can be connected to a press device for moving the press jaws, particularly an electro-hydraulic press device. In this case, the connection can be permanent. Alternatively, the press tool can be detachably connected to the press device.

[0016] A second aspect of the present invention relates to a press tool for pressing a press fitting with a press ring.

[0017] Here, the press tool comprises two press jaws that are movable toward each other from an open position to a closed position for pressing, particularly by a drive mechanism. Furthermore, the press jaws include connecting elements for connecting to the respective receiving elements of the press ring, and the press ring can be moved from an open position to a closed position by the movement of the press jaws to press the press fitting. This may be a press ring according to a first aspect of the present invention, a second press ring as described above, or a different press ring.

[0018] According to the present invention, the minimum distance between connecting elements in the open position is greater than the maximum distance between receiving elements of the press ring in the open position. Therefore, the press tool according to the first aspect of the present invention can be connected to a press ring because the minimum distance between connecting elements in the open position is greater than the distance between each receiving element. Thus, the press jaws of the press tool can be opened wide enough to connect the press tool to the press ring.

[0019] Furthermore, the minimum distance of the connecting elements in the closed position corresponds precisely to the minimum distance of the receiving elements of the press ring in the closed position. This ensures that the press tool according to the first aspect of the present invention can close the press ring, and thus, optimal pressing of the press fitting is achieved.

[0020] Furthermore, the minimum spacing of the connecting elements in the closed position is greater than the minimum spacing of the receiving elements of the third press ring in the open position, thus preventing pressing by the third press ring. Therefore, when the press jaws of the press tool according to the second aspect of the present invention are moved to the closed position, the connecting elements are further spaced apart than the minimum spacing of the receiving elements of the third press ring in the open position. Thus, there is no proper transmission of movement from the press tool to the third press ring, and therefore there is no movement of the press ring from the open position to the closed position. Thus, unintended combination of the press tool and the third press ring according to the second aspect of the present invention is prevented. This prevents incorrect pressing / damage to the press tool or press ring, and damage to the press fitting.

[0021] Preferably, the minimum distance of the connecting elements in the open position is smaller than the maximum distance of the receiving elements of the fourth press ring in the open position, preventing connection with the fourth press ring. The third and fourth press rings are different press rings.

[0022] Furthermore, the press tool according to the second aspect of the present invention is further developed in accordance with the features as described above with respect to the press tool according to the first aspect of the present invention.

[0023] The third aspect of the present invention relates to a press ring for pressing a press fitting, particularly by the press tool according to the first aspect of the present invention. In this case, the press ring has at least two segments movably connected to each other, and the segments are movable from an open position to a closed position by the movement of the press tool. Further, the press ring has two receiving elements, and these receiving elements can be connected to or formed integrally with one of the segments, respectively, for receiving the respective connecting elements of the press tool.

[0024] According to the present invention, the maximum distance between the receiving elements in the open position is smaller than the minimum distance between the connecting elements of the press tool in the open position. Therefore, since the minimum distance between the connecting elements is larger than the distance between the receiving elements in the open position, respectively, the press tool can be connected to the press ring. In this way, the press jaws of the press tool can be opened wide enough to connect the press tool to the press ring.

[0025] Furthermore, the minimum distance between the receiving elements in the closed position exactly corresponds to the minimum distance between the connecting elements of the press tool in the closed position. Thereby, the press tool can reliably close the press ring, and as a result, optimal pressing of the press fitting is achieved.

[0026] Furthermore, since the maximum distance of the receiving element in the open position is greater than the maximum distance of the connecting element of the second press tool in the open position, the connection with the press ring is prevented. The maximum distance between the receiving elements of the press ring in the open position is greater than the maximum distance between the connecting elements of the second press tool in the open position, so it is impossible to connect the second press tool to the press ring and is thus excluded. In other words, the press tool according to the first aspect of the present invention cannot open wide enough to connect to a mismatched second press ring. Thereby, incorrect pressing or damage / destruction of the press tool or press fitting is prevented. In this regard, the second press tool may be a press tool according to the first aspect of the present invention, a press tool according to the second aspect of the present invention, or a different press tool.

[0027] Preferably, the receiving element is an undercut or spherical recess into which a connecting element of a press tool designed as a spherical segment can be inserted.

[0028] Preferably, the receiving element is a connecting pin for connecting to a connecting element of the press tool.

[0029] Preferably, the press ring is a press collar, particularly having two or more segments.

[0030] Preferably, the press collar is designed as described in the German Utility Model Application Publication No. 202020102724 of "Antriebseinheit".

[0031] A fourth aspect of the present invention relates in particular to a press ring for pressing a press fitting by a press tool according to a second aspect of the present invention. In this case, the press ring has at least two segments that are movably connected to each other, and the segments are movable from an open position to a closed position by the movement of the press tool. Furthermore, the press ring has two receiving elements, each receiving element may be connected to or integrally formed with one of the segments, in order to receive each of the connecting elements of the press tool.

[0032] According to the present invention, the maximum distance between receiving elements in the open position is smaller than the minimum distance between connecting elements of the press tool in the open position. Therefore, the minimum distances between connecting elements are each larger than the distance between receiving elements in the open position, so that the press tool can be connected to the press ring. In this way, the press jaws of the press tool can open wide enough to connect the press tool to the press ring.

[0033] Furthermore, the minimum distance of the receiving elements in the closed position corresponds precisely to the minimum distance of the connecting elements of the press tool in the closed position. This ensures that the press tool can reliably close the press ring, resulting in optimal pressing pressure for the press fitting.

[0034] Furthermore, since the maximum distance of the receiving elements in the open position is smaller than the minimum distance of the connecting elements of the third press tool in the closed position, pressing by the third press tool is prevented. Therefore, when the press jaws of the third press tool are moved to the closed position, the connecting elements are further separated than the minimum distance of the receiving elements of the press ring in the open position. Thus, there is no proper transmission of motion from the third press tool to the press ring, and therefore there is no movement of the press ring from the open position to the closed position. This prevents unintended combination of the third press tool and the press ring. This prevents mispressing / damage of the press tool or press ring, and damage to the press fitting. Here, the third press tool may be a press tool according to the first aspect of the present invention, a press tool according to the second aspect of the present invention, or a different press tool.

[0035] Preferably, the maximum distance of the receiving elements in the open position is greater than the maximum distance of the connecting elements of the fourth press tool in the open position. Here, the third press tool and the fourth press tool are different press tools.

[0036] Furthermore, a press ring according to a fourth aspect of the present invention is further developed with respect to the press ring according to a third aspect of the present invention, in accordance with the features described above.

[0037] Furthermore, in a fifth embodiment, the present invention relates to a set comprising a press tool according to a first embodiment of the present invention and at least one press ring according to a third embodiment of the present invention. In particular, this set comprises a first group of press rings, all of which can be used in conjunction with the press tool according to a first embodiment of the present invention.

[0038] Furthermore, in a sixth embodiment, the present invention relates to a set comprising a press tool according to a second embodiment of the present invention and at least one press ring according to a fourth embodiment of the present invention. In particular, this set comprises a second group of press rings, all of which can be used in conjunction with the press tool according to a first embodiment of the present invention. In particular, the first group of press rings according to a fifth embodiment of the present invention cannot be used with the press tool of this set.

[0039] Furthermore, the present invention relates to a system including a set according to a fifth aspect of the present invention and a set according to a sixth aspect of the present invention.

[0040] Preferably, the system includes a further set, the further set including a press tool and a third group of press rings, the press rings of the third group cannot be used with the press tools of the other sets, and the press rings of the first and / or second groups cannot be used with the press tools of the further set. [Modes for carrying out the invention]

[0041] The present invention will be described in more detail below with reference to the attached drawings, using preferred embodiments. [Brief explanation of the drawing]

[0042] [Figure 1] This shows the press apparatus according to the present invention. [Figure 2A] The first set according to the present invention is shown. [Figure 2B] The first set according to the present invention is shown. [Figure 2C] The first set according to the present invention is shown. [Figure 3A] A second set according to the present invention is shown. [Figure 3B] A second set according to the present invention is shown. [Figure 3C] A second set according to the present invention is shown. [Figure 4A]Another embodiment of the press tool is shown. [Figure 4B] Another embodiment of the press tool is shown.

[0043] Figure 1 shows a press tool according to the present invention, equipped with a drive unit 10 designed, for example, as an electro-hydraulic drive unit. A press tool 12 is connected to the drive unit 10, which engages with a press ring 14 for pressing a press fitting 38. Here, the drive unit 10 moves a cylinder 22 according to arrow 20, in which case a roller 24 contacts a curved contact surface 26. As the cylinder 22 moves, the press jaws 16 of the press tool 12 swing around a rotation axis 18. As a result, the connecting elements 30 on the opposite side of the contact surface 26 move toward each other from an open position to a closed position according to arrow 28.

[0044] In the example shown in Figure 1, the connecting elements 30 are formed as spherical segments. These engage with receiving elements 32 formed in corresponding spherical recesses of the press ring 14. The press ring 14 has multiple segments 34, which are rotatably connected to each other around a pivot axis 40. By moving the press jaws 16 of the press tool 12, the press ring 14 moves from the open position shown in Figure 1 to the closed position. Here, the distance 42 between the end segments 34 is reduced. This reduces the radius of the inner opening 36 formed by the segments 34, and the pressing force is transmitted to the press fitting 38, which is pressed.

[0045] In the following, identical or similar components are indicated by the same reference number.

[0046] Figure 2 shows a first set consisting of a first press tool 44 and a first press ring 14, which are designed to fit together.

[0047] In Figure 2A, both the first press ring 14 and the first press tool 44 are shown in the open position. In this context, the open position is the position where the press device has not yet moved or the press ring 14 is loosely set around the press fitting 38. The open position is characterized by the open press ring 14 having a corresponding distance 42 (shown in Figure 1) of terminal segments 42. For the first press tool 44, the minimum distance between connecting elements 30 is indicated by B3. Furthermore, the minimum distance of the receiving elements 32 of the first press ring 14 is marked by B1, while the maximum distance of the receiving elements 32 is marked by B2. Here, the minimum distance B1 is measured, for example, from the bottom surface of the spherical recess of the receiving element 32. On the other hand, the maximum distance B2 of the receiving elements 32 in the example shown in Figure 2 indicates the minimum distance B2 that the connecting element 30 should have to fit over the projection of the receiving element 32. Therefore, in the case of the set in Figure 2, B3 > B2 applies to the open position of both the first press ring 14 and the first press tool 44, as shown in Figure 2A.

[0048] Figure 2B shows the closed position, i.e., the first set after the press has been performed. In this case, the minimum distance B4 of the receiving element 32 of the first press collar 14 decreases from B1 to B4. In particular, the distance 41 of the end segment 34 of the first press collar 14 decreases to 0 or nearly 0, and at the same time, the minimum distance of the connecting element 30 of the first press tool 44 decreases from B3 to B5. In this case, the closed position of the first press tool 44 shown in Figure 2B corresponds to the maximum closed position of the first press tool at the end of the stroke of the cylinder 22. In particular, further closing or reduction of the minimum distance B5 of the connecting element 30 is not possible. Here, B4 is selected to be equal to B5. The minimum distance B5 of the connecting element 30 at the end of the travel path corresponds to the press ring 14 being fully closed, or just to the minimum distance B4 of the receiving element 32 of the first press ring 14, thereby ensuring complete and proper pressing of the press fitting 38.

[0049] Attempting to operate the first press ring 14 with an unsuitable second press tool 46 is impossible, in particular, because the minimum distance A3 of the second press tool 46 from the connecting element 30 in the open position shown in Figure 2C is smaller than the maximum distance B2 from the receiving element 32 of the first press ring 14. Therefore, it is impossible to push the connecting element 30 onto the projection of the receiving element 32 of the first press ring 14. Consequently, the second press tool 46 cannot be applied to the first press ring 14. This prevents incorrect pressing and / or damage to the press tool or press ring.

[0050] Figure 3 shows a second set including a second press tool 46 and a second press ring 48. Here, the second press tool 46 may be the same as or different from the press tool in Figure 2C. In any case, the minimum distance A1 of the receiving elements 32 of the second press ring 48, the maximum distance A2 of the receiving elements 32 of the second press ring 48, and the minimum distance A3 of the connecting element 30 of the second press tool 46 are also matched such that A3 > A2 is selected, and therefore the connecting element 30 of the second press tool 46 can fit onto the projection of the receiving element 32 of the second press collar 48, and therefore the connecting element 30 can be inserted into the recess of the receiving element 32. Here, Figure 3A shows the second set of the second press collar 48 and the second press tool 46 in their open positions. Figure 3B shows both the press collar 48 and the second press tool 46 in their closed positions. Here, the minimum distance A5 of the connecting elements 30 of the second press tool 46 corresponds to the minimum distance A4 of the receiving elements 32 of the second press ring 48. Based on this correspondence, a complete press fitting is performed.

[0051] At this point, attempting to operate the second press ring 48 with another press tool 44 is impossible due to the selected dimensions. In particular, the additional press tool 44 may or may not correspond to the first press tool 44 in Figure 2. Here, the minimum distance B5 of the connecting element 30 of the second press tool 44 corresponds to the minimum distance A1 of the receiving element 32 of the second press ring 48. Therefore, when the additional press tool 44 is fully closed or at the end of its travel path, the press fitting 38 is not pressed by the second press collar 48. This is clearly recognizable to the user. In particular, incomplete or inaccurate pressing does not occur.

[0052] In particular, multiple press rings can be grouped together, and all of these press rings can be pressed with the same press tool. Here, the dimensions are preferably adapted according to the set shown in Figures 2 and / or 3. Further press collars can be combined into a second group or further groups, each group provided with a special press tool, so that all the press rings in the group can be properly pressed with the same press tool. However, the press tool of one group cannot be used for the press rings of the other group, because the minimum distance of the press tool in the open position is smaller than the maximum distance of the receiving elements of the press rings of the other group in the open position. Alternatively, the minimum distance of the connecting elements of the press tool in the closed position is larger than the minimum distance of the receiving elements of the press rings of the other group. Alternatively, the minimum distance of the press tool in the open position is smaller than the maximum distance of the receiving elements of the press rings of the first other group in the open position, and furthermore, the minimum distance of the connecting elements of the press tool in the closed position is larger than the minimum distance of the receiving elements of the press rings of the second other group. Therefore, three or more groups can be formed with a corresponding number of different press tools and one or more press collars for each group.

[0053] Figures 4A and 4B show further embodiments of the connecting element, where the connecting element 52 of the press tool 50 according to Figure 4A is formed as an undercut 54 for connecting to a connecting pin 64 of a press collar 62, as described, for example, in the German utility model application publication No. 202020102724, “Antriebseinheit”. Here, the minimum distance A3 is the distance between the ends of the lugs 52 that define the recesses 44, which are oriented toward each other. At the same time, the maximum distance is the distance between the bottom surfaces of the respective recesses 54. Figure 4A shows the press collar 62 in the open position, where the connecting bolt 64 has a maximum distance A2 that is smaller than the minimum distance A3 of the matching press tool 50. Figure 4B shows the press collar in the closed position with a minimum distance A4, where the minimum distance A4 substantially corresponds to the distance of the connecting element 52 of the matching press tool 50.

[0054] In other words, 1. Type A press rings can be operated with Type A tools. Type A tools only press Type A press rings in combination with other Type A press rings. The opening of a Type A tool is too small to fit Type B and Type C press rings. 2. Type B press rings can be operated with Type B tools. Type B tools only press Type B press rings in combination with Type B press rings. The opening of the Type B tool is too small to be used with Type C press rings. At the same time, the opening of the Type B tool is too large to press Type A press rings. 3. Type C press rings can be operated with Type C tools. Type C tools only press Type C press rings in combination with Type C press rings. The opening of Type C tools is too large to press Type A and Type B press rings.

[0055] In this way, a system is constructed that avoids unintended combinations of press rings and press tools. In particular, the geometric dimensions of the connecting and receiving elements prevent inappropriate combinations of press tools and press rings. Incomplete pressing, damage to the press tool or press ring, and other problems caused by inappropriate combinations of press tools and press rings are thus prevented.

Claims

1. A press system for pressing a press fitting using a press ring and a press tool, The aforementioned press system includes multiple press tools, The aforementioned press system includes a plurality of press rings, Of the aforementioned multiple press tools, the first press tool is It includes two press jaws that can move relative to each other from an open position to a closed position for pressing, The press jaw includes a connecting element for connecting to each receiving element of the first press ring among the plurality of press rings, and the first press ring moves from an open position to a closed position by the movement of the press jaw for pressing the press fitting. The minimum distance of the connecting elements in the open position is greater than the maximum distance of the receiving elements of the first press ring in the open position. The minimum distance of the connecting elements in the closed position corresponds to the minimum distance of the receiving elements of the first press ring in the closed position. The first press tool is, The connection elements are configured such that the minimum distance between them in the open position does not exceed a predetermined value. With respect to a second press ring, which differs from the first press ring among the plurality of press rings and has a second receiving element having a maximum distance exceeding the predetermined value, the connection element is prevented from engaging with the second receiving element to form a connection. The first press tool is, The minimum distance of the connecting elements in the closed position is configured not to decrease beyond the maximum closed position defined by the drive device. In the case of a third press ring, which differs from the first press ring among the plurality of press rings and has a third receiving element having a minimum distance smaller than the minimum distance of the connecting element in the closed position, the movement of the press jaw is not transmitted to the third press ring, and pressing is prevented because the third press ring does not move from the open position to the closed position. Press system.

2. The connecting element is a spherical segment or a segment similar to a sphere. The press system according to claim 1.

3. The connecting element is an undercut for connecting to the connecting bolt of the press ring. The press system according to claim 1 or 2.

4. The press tool can be connected to a hydraulic or mechanical press device for moving the press jaws. The press system according to any one of claims 1 to 3.

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