EP2246286A1 - Rotation device for load bearing devices such as excavator grabbers or similar - Google Patents

Abstract

The device (10) has a rotating unit (11) comprising a stator (12) and a rotor (13), and a rotating drive provided between the stator and the rotor. A rotary feed-through comprises a part (15) rotating with the rotor, and another part (16) connected with the stator. A seal (17) is arranged in the latter part for sealing a channel connection (18) between the parts. The latter part comprises a seal (17) and formed as a separate ring part (20) that is axially attached to the stator for replacement of the seal. The separate ring part is made of spherulite material.

Description

The invention relates to a rotating device for load-handling devices, such as excavator gripper od. Like., With a rotary unit of stator, rotor and rotary drive between the two and with a rotary feedthrough, a co-rotating with the rotor first part and a fixed, connected to the stator second part and arranged in the second part seals for sealing of channel connections between the first part and the second part and for the passage of fluid, such as pressure oil, and / or electrical lines for supplying work equipment as load-receiving means, for. B. of grippers, saws, scissors od. Like., Is formed.

A rotating device of this kind is z. B. from the EP 1 674 420 A1 known, which is provided with an effective between the stator and the rotor braking device. The rotor is rotatably connected to a cylinder as the first part of the rotary feedthrough. The cylinder projects beyond the stator and the rotor in both axial directions, wherein as the second part of the rotary feedthrough a two-part sleeve of considerable axial length is provided, which by means of Screws not releasably connected to the stator is firmly connected. The stator axially penetrated by the cylinder has inner ring seals for sealing passage connections provided between the stator and the cylinder for passing fluid. Also, between the fixed to the stator second part of the rotary feedthrough and the cylinder a plurality of seals is arranged for sealing further channel connections for the passage of fluid. Due to the rotatability of the cylinder rotated with the rotor, the seals are exposed to correspondingly great stresses and must therefore be renewed at certain intervals or even before they are damaged. This requires a complete disassembly of the rotating device, which also has to be separated from the load-holding means on the one hand and from the top-side suspension on the other. This complete disassembly is not only time consuming but requires professional skill and care to avoid contamination and incorrect assembly and possible damage to previously intact seals.

The invention has for its object to provide a rotating device of the type mentioned, the z. B. allows a safe, easy and quick replacement of the seals between the two parts of the rotary feedthrough.

This object is achieved with a rotating device of the type mentioned according to the invention in that the fixed second part, which contains the seals, is designed as a separate ring member, which is attached axially to the stator and with this for disassembly, z. B. od for the replacement of the seals. Like., Is detachably connected.

Due to this design with separate, axially attached to the stator and releasably connected to this for disassembly ring part, it is possible to replace the seals, without the rotation of the Load-retaining means must be separated and without the need to disassemble the rotating device in detail. The attached to the separate ring part oil distributor can remain hydraulically and mechanically connected to the ring member when replacing the seals. The replacement of the seals requires no great expertise and can be done easily from both axial sides of the ring part ago. Calibration is easily possible. The risk of contamination, incorrect installation and any damage to previously intact seals is eliminated. In all, the rotating device is lightweight, compact, reliable and can be produced under cost-differentiated material selection for individual elements.

Further details and advantages of the invention will become apparent from the dependent claims and from the following description with the drawings.

The full text of the claims is not reproduced above solely to avoid unnecessary repetition, but instead referred to merely by reference to the claims on it, which, however, all of these claim characteristics have to be considered as explicit and essential to the invention at this point. Here are all mentioned in the preceding and following description features as well as the removable only from the drawings features further components of the invention, even if they are not particularly highlighted and in particular not mentioned in the claims. Reference will be made to avoid repetition in the following description of individual features and advantages.

Fig. 1

eine schematische perspektivische Ansicht einer Drehvorrichtung für Lastaufnahmemittel, stark vereinfacht,

Fig. 2

einen schematischen senkrechten Schnitt eines Teils der Drehvorrichtung in Fig. 1.

The invention is explained in more detail with reference to an embodiment shown in the drawings. Show it:

Fig. 1

a schematic perspective view of a rotating device for lifting equipment, greatly simplified,

Fig. 2

a schematic vertical section of a part of the rotating device in Fig. 1 ,

In the drawings, a rotating device 10, also referred to as a rotator, is shown, which is suitable for load-receiving means or working means, such. B. excavator gripper or other gripper, saws, scissors od. Like. Is formed. On the in Fig. 1 and 2 The upper side of the rotary device 10 can be conventionally attached to a suspension fitting by means of threaded bolts formed as long expansion screws from above. The connector, not shown, is adapted to the respective customer system for suspension. At the in Fig. 1 and 2 lower side of the rotating device 10 may be a matched lower fitting z. B. be releasably attached in the form of an oil distributor, which z. B. can be done in the region of the center. In addition, on the underside of the rotating device 10, the attachment corresponding to the respective attachment can be releasably secured, for. B. by means of edge-mounted fastening screws 50.

The illustrated rotary device 10 has a rotary unit 11 with a stator 12, a rotor 13 and an effective between both, not shown here rotary drive. The rotary drive may preferably be designed as a hydraulically operated radial piston drive, as he z. In EP 1 674 420 A2 shown and described and has proven itself. Such a known rotary drive has a plurality of radially to the central center axis 22, which forms the axis of rotation for the rotor 13, arranged in the stator 12 piston-cylinder assemblies. The roller-shaped rolling bodies assigned to the individual pistons of the piston-cylinder arrangements roll off on an only indicated curved track 34 whose distance from the central axis 22 cyclically around them between a maximum distance in which the piston is extended and a minimum distance, in which the piston retracted, alternates. The operation of the piston-cylinder arrangement, not shown, and thus the rotation of the rotor 13 with respect to the stator 12 in a conventional manner via internal hydraulic channels and an indicated plan distributor 23. The direction of rotation can be reversed by reversing the supplied oil flow. Depending on the oil pressure and the available oil quantity of the mounted implement carrier, the torque and the rotational speed can be generated. The underside of the rotating device 10 attachable oil distributor and there also releasably attachable attachment and attachable on the top means for suspension are not shown in the drawings and known per se.

The rotary device 10 has a rotary leadthrough comprising a first part 15 which rotates with the rotor 13, further comprises a second part 16 which is connected to the stator 12 and fixed, as well as in the second part 16 arranged seals 17 which are for sealing channel connections 18 are provided between the first part 15 and the second part 16 and are designed for the passage of fluid, such as pressure oil, and / or electrical lines for supplying working means mounted on the underside of the rotary device 10. Is z. B. attached to the underside of the rotating device 10, a gripper and connected via an oil distributor to inner axial channels, so z. B. close an axial channel 19 for the function gripper and open the other axial channel 19 for the function gripper be responsible due to passed through these axial channels 19 pressure oil.

The co-rotating with the rotor 13 first part 15 of the rotary feedthrough is formed from a cylinder 27. The cylinder 27 terminates with an axial, lower end face 28 approximately flush with the rotor 13. The axial channels 19 are contained in the interior of the cylinder 27 and open to the axial end face 28. On the axial side of the rotor 13, which faces away from the stator 12, the rotor 13 has a stepped central passage opening 29, within which the cylinder 27 is received with an associated stepped end shoulder 30 and is attached to the rotor 13. The rotor 13 and the cylinder 27 thus constitute a co-rotating element. Between the rotor 13 and the stator 12 are disposed annular seals 24 which are received in grooves of the stator 12. The rotor 13 is located in the region of the underside of the stator 12. On the opposite axial side, thus on the upper side of the stator 12, the fixed second part 16 is arranged, which contains the seals 17. This fixed second part 16 is formed as a separate ring member 20 and axially attached to the stator 12 and with the stator for disassembly for the purpose of replacement of the seals 17 od. Like. Solutably connected. The connection of the ring member 20 with the stator 12 by means of fastening means, in particular by means of screws 21 which pass through through holes 14 in the ring member 20 and engage in associated threaded holes 54 in the stator 12 with its threaded portion. These screws 21 are peripherally provided in the circumferential direction of the ring member 20 at regular intervals, wherein z. B. eight such screws 21 may be provided. These are sunk in the ring member 20. On the ring member 20, an oil distributor 51, indicated only schematically, is fastened on the outer circumference, which extends over a circumferential angle section of the ring member 20 and contains connections and channels for the introduction of pressure oil for controlling the rotary drive and as work equipment. Characterized in that the ring member 20 is releasably secured by means of screws 21 from above on the axial side of the stator 12, this ring member 20 can be easily and easily detached from the stator 12 and removed together with the seals 17 contained, without it being necessary the turning device 10 from the attachment, z. B. gripper to separate. In this case, the rotary device 10 remain hydraulically and mechanically connected to the oil distributor 51. The rotating device 10 need not be disassembled to replace the seals 17. The seals 17 can be replaced quickly and easily. It can be worked from two axial sides of the ring member 20. Calibration is easily possible. The risk of any contamination, any incorrect installation and any damage to previously intact seals omitted. Special expertise for the disassembly of the ring part 20, the replacement of Seals 17 and the rebuilding of the ring member 20 is not required. Assembly error and the risk of eventual pinching of O-rings or other seal in the stator 12 z. B. are frontally provided are excluded.

In known rotary devices, the upper side of the rotary device 10 to be mounted connecting piece is screwed to the suspension by means of axially parallel screws on the fixed upper part 16. This has many disadvantages. The relatively short screws often loosen and lead to screw breakage, so that it would require increased control of the screws and any rewinding of these, in order to avoid such. The relatively short screws are exposed to large forces over a short length.

The fact that the fixed second part 16 is formed as a separate ring member 20 which is axially attached to the stator 12 and is detachably connected thereto, it is also advantageously possible to form such fastening screws for fastening upper side fittings as long threaded bolts, in the Ring member 20 included, pass through invisible through holes and aligned with not shown associated threaded holes that are included in the stator 12, and engage in these threaded holes. This has the advantage that the separate ring member 20 is not load-bearing, but only represents an intermediate member, reach through the threaded holes through the through holes to the threaded holes in the stator. The load which acts on the stator 12 from the rotor 13 is conducted from the stator 12 via the threaded bolts to the top-side connecting piece, without the top-side ring part 20 being loaded with these forces. Because these threaded bolts are screwed into the lower-lying stator 12, such threaded bolts with significantly larger screw length, the z. B. is extended by about 100 mm. As a result, these threaded bolts become expansion screws. An uncontrolled release of these threaded bolts is almost locked out. Since the upper ring member 20 is not load-bearing, this can without heat treatment, for. B. without case hardening, are manufactured. The ring member 20 may be made of cast material in the casting, z. B. Sphärolitguss. At the same time, there is the advantage that in these upper-side ring member 20 symbols, product information od. Like. When molding with can be represented.

It is also advantageous that the actual stator 12 is small, compact, lightweight and easily replaceable. It can be pre-assembled with the rotating, connected to the rotor 13 parts and also with the upper ring member 20 as a unit in stock.

Out Fig. 2 It is clear that the stator 12 on the axial side facing away from the rotor 13 and thus facing upwards, a stepped recess 25, into which the ring member 20 engages with a shoulder 26 fitting, sealing the contact surfaces with O-rings. The centrally arranged cylinder 27 closes with the end facing away from the stator 12 and thus directed upward, at least approximately flush with the ring member 20, wherein an end plate 32 attached to the end of the cylinder 32 is provided which engages over a bearing 31 radially , which is arranged at the end between the ring member 20 and the cylinder 27 and is designed as a radial bearing. The end plate 32 thus serves at the same time as a protection for the bearing 31. It can be releasably secured to the cylinder 27 and is removed to remove the ring member 20 with the bearing 31 before.

The outer diameter of the separate ring member 20 is dimensioned smaller than the axially underlying elements of the rotating device 10, also smaller than an axially downwardly adjoining thereto, the stator 12 comprehensive ring 35. This ring 35 contains z. B. a not shown bearing, z. As plain bearings, for the storage of the rotor 13 relative to the stator 12 and / or at least one voltage applied to the stator 12 sealing ring 37 and / or scraper ring 36th Axially connects to the ring 35 at least one of the stator 12 surrounding bearing ring 33, which includes the inner peripheral cam track 34 of the rotary drive. At this bearing ring 33 of the ring 35 located above it, which in the example contains a sealing ring 37 and scraper ring 36, releasably secured. The attachment takes place by means of screws 38 which engage in the bearing ring 33. In this way, the ring 35 is similar to the upper ring member 20 disassembled, z. B. for the purpose of replacing the at least one sealing ring 37 and / or scraper ring 36. Axial between this bearing ring 33 and the rotor 13, a further middle bearing ring 41 is arranged. The rotor 13, the bearing ring 41 and the bearing ring 33 are held together by means of screws 49, the rotor 13 and the middle bearing ring 41 in Fig. 2 from below, so from the area of the end face 28, enforce and engage in the bearing ring 33. In this way, the rotor 13 and the bearing rings 41 and 33 are clamped together, wherein sealing rings, for. B. O-rings, are arranged in the region of the adjacent axial sides. Due to this design, it is possible to form the above the bearing ring 33 ring 35 in contrast detachable and disassembled and fastened by means of detachable screws 38 from above. Since the upper ring member 20 has a smaller outer diameter than the ring 35, the screws 38 are in Fig. 2 freely accessible from above for loosening. The rotor 13 and the two bearing rings 33 and 41 have a comparatively larger outer diameter. They are interspersed with the fastening screws 50, which serve to attach the attachment to the underside.

The rotor 13 and the two bearing rings 33 and 44 are on the in Fig. 2 lower portion of the stator 12 is mounted by means of bearing bodies 48, in particular balls. For this purpose, the rotor 13 and the bearing rings 33 and 41 each include inner circumferential bearing surfaces 42, 43, 44, which may be designed as ball races in adaptation to the bearing body 48, in particular balls. The lower part of the stator 12 is provided with corresponding associated circumferential bearing surfaces 45, 46, 47, in particular ball raceways, of which z. B. the in Fig. 2 upper bearing surfaces 46 and 47 are designed as a cross-sectionally approximately semicircular annular grooves with adaptation to the bearing body 48, while the lower bearing surface 45 is designed approximately as a quarter-circle annular path. In the bearing rings 33 and 41, as shown, the bearing surfaces 43 and 44 may be formed as in cross-section approximately quarter-circular ring paths, while the bearing surface 42 of the rotor 13 as in cross section z. B. at least approximately semicircular annular path can be formed. Out Fig. 2 It can be seen that this lower bearing surface 42 extending in the arc beyond a semicircle z. B. may extend to about 270 ° circumferential angle. Since the individual bearing surfaces and in this rolling bearing body 48 have a relatively large distance in the axial direction from each other and are directed approximately parallel to the central axis 22, due to this storage, large forces, including lateral forces and bending forces, between the rotor 13 with the bearing rings 41 and 33 on the one hand and the lower part of the stator 12, on the other hand. Because of this, such as in Fig. 2 is shown at the upper ring 35 to another camp, z. B. plain bearings, for the local storage of the upper part of the stator 12 are omitted.

The rotor 13 and / or the stator 12 are expediently as a hardened, z. B. case-hardened, formed component.

The thus designed according to the invention rotating device 10 is in view of the seals 17, the sealing ring 37 and the wiper ring 36 easy to install and designed for easy replacement of this, which can be completed quickly and easily without special expertise, without it being necessary Further to dismantle rotating device 10 and separate from the load holding means attached thereto. For the purpose of the exchange of both axial sides can be worked, which makes this particularly simple and easy. In all, the rotating device 10 is compact, lightweight and, among other things, also cost-effective in terms of material selection for the individual elements.

Claims (19)

Turning device (10) for load-receiving means, such as excavator gripper od. Like., With a rotary unit (11) of stator (12), rotor (13) and rotary drive between the two and with a rotary feedthrough, the one with the rotor (13) co-rotating first part (15) and a fixed, with the stator (12) connected to the second part (16) and arranged in the second part (16) seals (17) for sealing of channel connections (18) between the first part (15) and the second part ( 16) and for the passage of fluid, such as pressure oil, and / or electrical lines for supplying work equipment, for. B. grippers, is formed,
characterized,
in that the fixed second part (16), which contains the seals (17), is formed as a separate ring part (20), which is attached axially to the stator (12) and with this for disassembly, z. B. od the replacement of the seals (17). Like., Is detachably connected. Turning device according to claim 1,
characterized,
that the connection of the ring member (20) with the stator (12) by means of engaging in the latter fastening means, for. B. screws (21), takes place. Turning device according to claim 1 or 2,
characterized,
that the stator (12) contains threaded holes which are aligned with through-holes in the ring member (20) and engage in the attachment of a suspension serving threaded bolt, which pass through the through holes. Turning device according to one of claims 1 to 3,
characterized,
that the stator (12) on the axial side facing away from the rotor (13) contains a stepped recess (25) into which the ring part (20) engages fittingly with a shoulder (26). Turning device according to one of claims 1 to 4,
characterized,
in that the first part (15) of the rotary feedthrough co-rotating with the rotor (13) is formed from a cylinder (27) and the cylinder (27) terminates with an axial end face (28) approximately flush with the rotor (13). Turning device according to claim 5,
characterized,
in that the cylinder (27) contains axial channels (19) which open out to the one axial end face (28) of the cylinder (27). Turning device according to claim 5 or 6,
characterized,
that the rotor (13) on the axial side remote from the stator (12) has a stepped central passage opening (29) within which the cylinder (27) is received with an associated stepped end shoulder (30) and fixed to the rotor (13). Turning device according to one of claims 5 to 7,
characterized,
in that the cylinder (27) terminates approximately flush with the ring part (20) with the end facing away from the stator (12). Turning device according to one of claims 5 to 8,
characterized,
that the ring portion (20) comprises a bearing (31) of the cylinder (27) ends. Turning device according to claim 9,
characterized,
that at one end of the cylinder (27) an end plate (32) is fixed, which engages over the bearing (31). Turning device according to one of claims 1 to 10,
characterized,
in that at least one bearing ring (33, 41) surrounding the stator (12) is fastened to the rotor (13) and which contains an inner peripheral cam track (34) of the rotary drive. Turning device according to one of claims 1 to 11,
characterized,
that on the rotor (13), preferably on the bearing ring (33) of this, a stator (12) comprehensive ring (35) is held, the a bearing, for. B. sliding bearing, for the rotor (13) for supporting this relative to the stator (12) and / or at least one on the stator (12) adjacent the sealing ring (37) and / or Contains scraper ring (36). Turning device according to claim 12,
characterized,
that the ring (35) for disassembly, z. B. for the purpose of replacing the at least one sealing ring (37) and / or scraper ring (36) releasably on the rotor (13), preferably on the bearing ring (33) of this, is held, for. B. by means engaging therein screws (38). Turning device according to one of claims 11 to 13,
characterized,
that a further middle bearing ring (41) is arranged axially between the bearing ring (33) and the rotor (13). Turning device according to claim 14,
characterized,
in that the rotor (13) and the bearing rings (33, 41) each contain bearing surfaces (42, 43, 44), in particular ball raceways, to which corresponding bearing surfaces (45, 46, 47), in particular ball raceways, are assigned to the stator (12) on which bearing body (48), in particular balls, roll. Turning device according to one of claims 11 to 15,
characterized,
that the rotor (13) and the bearing rings (33, 41) are held together by means of screws (49), which pass through the rotor (13) and the central bearing ring (41) from the end face (28) forth and (in the other bearing ring 33 ) intervene. Rotary device according to one of claims 11 to 16,
characterized,
that both bearing rings (33, 41) and the rotor (13) of fastening screws (50) are interspersed. Turning device according to one of claims 1 to 17,
characterized,
that the rotor (13) and / or the stator (12) as a hardened, z. B. case-hardened, component is formed. Turning device according to one of claims 1 to 18,
characterized,
that the separate ring member (20) made of cast material, for. B. Sphärolitguß is formed.

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