Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/3604—Devices to connect tools to arms, booms or the like
  • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
  • E02F3/3681—Rotators
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
  • B66C3/005—Grab supports, e.g. articulations; Oscillation dampers; Orientation
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/3604—Devices to connect tools to arms, booms or the like
  • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets

Definitions

• the invention relates to a device for rotating a gripper or similar tool connected to the boom of an excavator or crane, having a stator which can be connected to the boom, a rotor which can be connected to the gripper and is rotatably mounted on the stator by means of a bearing arrangement about a vertical axis.
• stator-side connections arranged between stator and rotor, through two of stator-side connections out of the stator, through liquid-tight rotary feedthroughs and through a distributor possibly connected non-rotatably to the rotor with hydraulic oil, and with at least two through stator-side hydraulic drive mechanisms Connections through the stator and through liquid-tight rotary feedthroughs to the rotor and through this through hydraulic channels led to rotor-side connections, preferably for hydraulic gripper actuation.
• a rotating device of this type is known (EP-B-0 080 670), in which the bearing arrangement is arranged inside the rotating device in such a way that the stator, rotor and drive mechanism have to be completely disassembled for its maintenance.
• the known construction results in a relatively large overall height with a correspondingly large weight.
• the invention is based on the object of improving the known rotary devices of the type specified at the outset in such a way that, in the case of a compact, flat design, maintenance is simplified, particularly in the area of the bearing arrangements and the wearing parts.
• the solution according to the invention is based on the idea that the entire bearing arrangement is arranged radially outside the drive mechanism essentially at its height.
• the bearing arrangement radially outside the drive mechanism at the height thereof has a bearing collar protruding radially outward on the inner device part (stator or rotor) and one on the outer device part (rotor or stator) arranged, radially inwardly open bearing groove encompassing the bearing ring, bearing elements formed as roller bearings and / or plain bearings and / or hydrostatic bearings being inserted or molded between the bearing ring and bearing groove.
• the external device part is expediently formed in two parts in the area of the bearing groove.
• An advantageous embodiment of the invention provides that two axial axles between the bearing ring and the bearing groove - 3 -
• At least one of the axial bearings can be designed as a roller bearing, preferably as a needle bearing, while the other axial bearing can be designed as a plain bearing or as a hydrostatic bearing.
• a further embodiment variant provides that two angular bearings are arranged between the bearing collar and bearing groove, which can be designed as roller bearings, preferably as tapered roller bearings or ball bearings.
• roller bearings preferably as tapered roller bearings or ball bearings.
• the angular contact bearings it is possible to design the angular contact bearings as plain bearings or as hydrostatic bearings.
• a third embodiment variant of the invention provides that the bearing ring and the bearing groove have complementarily curved bearing surfaces for receiving a plain bearing or a hydrostatic bearing.
• stator has the bearing ring and the rotor has the bearing groove.
• a further simplification in the maintenance of the rotary device can be achieved in that at least some of the hydraulic channels leading from the stator via the rotary unions to the rotor pass through the drive mechanism and the bearing arrangement centrally, and that one in the assembled state of the stator, rotor and rotor ⁇ drive mechanism accessible from the outside for access to at least part of the rotary unions and / or to the distributor and its seals, by a Lockable lockable central mounting opening is provided.
• the mounting opening can in principle also be arranged on the stator side, it is advantageous to arrange it on the gripper-side end of the rotor.
• the drive mechanism is preferably designed as a hydraulic axial or radial piston motor, the bearing ring being arranged at the height of the drive piston or balls.
• the drive mechanism is designed as a hydraulic rotary vane motor, the bearing ring being arranged at the height of the rotary vanes.
• the drive motor is designed as a hydrostatic internal gear motor or internal rotor, the bearing ring being arranged at the level of the motor toothings.
• FIG. 1 shows a vertical section through an axial piston motor in a flat design with a stator-side bearing ring and a rotor-side bearing groove;
• FIG. 2 shows a representation corresponding to FIG. 1 with two further bearing variants; 3 to 5 each show a section of the storage area of a turning device corresponding to FIGS. 1 and 2 with different storage variants.
• the rotating device shown in the drawing is intended for excavator grabs where high tensile, compressive and torque loads occur. They essentially consist of a stator 1 which can be connected to an excavator boom (not shown), a rotor 6 which is connected to the stator by means of a rotary connection 4 and to which an excavator gripper (not shown) can be fastened, and a rotor which acts between the stator and rotor 6 Drive mechanism 8.
• the rotary connection 4 has a bearing collar 40 which projects radially at the level of the drive mechanism 8 at the stator 1 and a bearing ring 40 which is arranged on the rotor and surrounds the bearing ring 40 in a form-fitting manner and is open radially inwards Bearing groove 42, with different bearing elements designed as roller bearings, plain bearings or hydrostatic bearings being inserted or molded between bearing ring 40 and bearing groove 42.
• an upper axial needle bearing 44, a radial needle bearing 46 and a lower axial slide bearing 48 are provided between the bearing collar 40 and the bearing groove 42.
• the radial needle bearing 46 is replaced by a slide bearing 46, while in the embodiment shown in the left area of FIG. 2, the lower slide bearing 48 is replaced by a needle bearing 48.
• FIGS. 1 and 2 When using tapered roller bearings 50, 52 according to FIG. 3, which are supported obliquely on the bearing ring 40 and in the bearing groove 42 or obliquely supported ball bearings 54, 56 according to FIG. 4, the three bearing elements of FIGS. 1 and 2 can be replaced by two bearing elements.
• bearing ring 40 and the bearing groove 42 with complementary curved bearing surfaces for receiving a correspondingly curved sliding bearing 58.
• the plain bearings 46, 48 and 58 can in principle also be designed as hydrostatic bearings.
• connections 15, 16 Arranged on the stator 1 in the area above the rotary connection 4 are four connections 15, 16 which are spaced apart from one another in the circumferential direction for the connection of hydraulic lines 17, 18, from which the hydraulic channels 15, 15 and 16, 16 form a rotary connection bushing 30 or a distributor 70 connected to the drive mechanism 8, in order to open from there into the rotor-side hydraulic channels 65, 65 or the distributor-side hydraulic channels 71, 71.
• the hydraulic channels 65, 65 on the rotor side lead to connections 66, 66 on the rotor side, to which hydraulic lines for gripper actuation are optionally connected, with the interposition of a connecting adapter which can be connected to the rotor by means of screws 67 and driving pins 68. are connectable.
• the rotary unions for the gripper hydraulics are formed by two pipe sections 32, 33 which penetrate centrally and coaxially through the stator 1 and the rotor 6 and which engage with their ends in stator-side or rotor-side stepped bores 19 and 69 and float there mend stored.
• a floating radial distributor 70 is provided, which is penetrated centrally by the pipe sections 32, 33 of the rotary feedthrough 30.
• the rotary unions 30 with their pipe sections 32, 33 and their sealing rings are accessible from the outside via an assembly opening 91 which can be closed by a closure piece 90 even when the stator, rotor and drive mechanism are assembled.
• the closure piece 90 has a pin 92 which can be inserted in a liquid-tight manner in an axial bore of the rotor which forms the assembly opening 91 and which can be fastened to the rotor 6 with the ring flange 93, screws 94 and driving pins 95.
• the closure piece 90 has a blind hole or step bore 69, which is open towards the interior of the device and coaxial with the axis of rotation, for receiving one end of the tube pieces 32, 33.
• the closure piece 90 has the two channel sections 65, 65 leading to the rotor-side connections 66, 66 for the gripper hydraulics, one of which is arranged essentially axially centrally and the other eccentrically.
• the exemplary embodiments shown in FIGS. 1 and 2 contain a drive mechanism 8 which is designed as an axial piston drive and which has a plurality of axial pressure cylinders 101 which are arranged on an incircle of the stator 1 at equal distances from one another, in each of which one piston 102 and one counter the end face of the piston 102, which is arranged through a cylinder opening and extends through a cylinder opening to a greater or lesser extent, is arranged.
• the pistons 102 are acted upon by hydraulic fluid, which enters the pressure cylinders 101 via the hydraulic channels 104.
• the balls 103 with their part protruding from the cylinder opening, bear against the undulating cam track 106 running along an incircle of the rotor with axial deflections.
• the cam track determines the stroke of the pistons 102 at all times.
• a radial piston drive instead of the hydraulic axial piston drive shown in the drawing, a radial piston drive, a rotary vane drive or a hydraulic internal gear drive (internal rotor) can also be used as the drive mechanism 8.
• the invention relates to a device for rotating a gripper or similar tool connected to the boom of an excavator or crane.
• the rotary device has a stator 1, a rotor 6 mounted on the stator 1 by means of a bearing arrangement 4 about a vertical axis, and a hydraulic drive mechanism 8 arranged between the stator and the rotor and at least two rotary unions 30 for the gripper actuation.
• the entire bearing arrangement 4 is arranged radially outside the drive mechanism at its height.
• the bearing arrangement 4 expediently has a bearing ring 40 which projects radially outward on the stator 1 and a bearing groove 42 which is arranged on the rotor 6 and surrounds the bearing ring 40 in a form-fitting manner and is open radially inwards.
• Bearing elements designed as roller bearings and / or plain bearings are inserted or molded between the bearing ring and bearing groove.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Rolling Contact Bearings (AREA)
• Earth Drilling (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7754376

Family Applications (1)

Country Status (3)

Cited By (1)

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Family Cites Families (4)

• 1996
  • 1996-02-19 AT AT96902986T patent/ATE183793T1/de not_active IP Right Cessation
  • 1996-02-19 WO PCT/EP1996/000684 patent/WO1996026326A1/fr not_active Ceased
  • 1996-02-19 EP EP96902986A patent/EP0809735B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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