Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
  • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
  • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
  • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
  • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C13/00—Other constructional features or details
  • B66C13/18—Control systems or devices
  • B66C13/46—Position indicators for suspended loads or for crane elements
• • 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
  • E02F3/3681—Rotators
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/26—Indicating devices
  • E02F9/264—Sensors and their calibration for indicating the position of the work tool
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G23/00—Forestry
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C13/00—Other constructional features or details
  • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
  • B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
  • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
  • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
  • G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code

Definitions

• the invention relates to a rotator for a jig-carried tool in accordance with the preamble of claim 1.
• tool/working implement at an external end of a crane arm or jib resides in the ability to i.a. orientate hoses and
• a rotator with means for determining the relative position of rotation between rotor and stator.
• Said means include a pulse emitter and a number of pulse generating elements such as grooves or teeth.
• said means it is only possible to determine the relative position of rotation between the rotor and the stator, and it is also sensitive to debris.
• One object of the present invention is to provide a rotator, which will significantly simplify the work required from the driver of the vehicle and enable a high degree of
• the inventive rotator it is also possible to prevent hose breakages and cable breakages as a result of wrong rotation of the tool.
• absolute position is meant that the each position is unique. This means that a control system for the rotator does not need any reference position and that it is not necessary, at upstart, to rotate the rotator to find the reference position. During maintenance of the tool/working implement, for instance, said tool/working implement may be rotated by hand which means that the position of rotation is different from the position of rotation when the work was stopped. This is a very important safety aspect, particularly when the rotator carries a harvesting unit.
• the object of the invention is to eliminate wholly or partly the above-identified drawbacks of the prior art. According to the invention this object is achieved by a rotator for a jib-carried tool, said rotator comprising a stator and a rotor, characterized in that said rotator
• a device for determining an absolute position of rotation between the stator and the rotor comprises a device for determining an absolute position of rotation between the stator and the rotor, that said device for determining the absolute position of rotation comprises an encoder in the form of a ring shaped magnetic means
• FIG. 1 is a schematic side view of a so-called single grip harvesting unit connected to a crane arm or jib through the medium of the inventive rotator,
• FIG. 2 is a sectional side view of the rotator according to the invention in a first embodiment
• - Fig. 3 is an exploded view of the rotator shown in Fig.2 in its normal working position
• - Fig. 4 shows the same view as in Fig. 3 but upside-down
• FIG. 5 is a sectional view of the rotator according to the invention in a second embodiment taken along section A-A in Fig. 6,
• - Fig.6 is a view from below of the rotator shown in Fig. 5
• Fig. 7 is an exploded view of the rotator shown in Fig.5 in its normal working position
• Fig. 1 shows a working implement/ tool 1 in the form of a so- called single-grip harvesting unit 1 which is suspended from the tip 2 of a machine-carried jib/crane arm 3 through the medium of a rotator 10 according to the invention.
• the rotator 10 is connected via a link arrangement or a swing damper 4, for instance, to the tip 2 of the jib/crane arm 3 and allows the tool to swing relative to the tip 2 of the jib/crane arm
• the rotator 10 enables the tool 1 to be rotated relative to the tip 2 of the jib/crane arm 3.
• Hydraulic medium (oil) is supplied to the rotator 10 and to the tool 1 through hoses 5, 6, and possible electrical cables 7 for the device for
• determining the absolute position of rotation and the tool are provided.
• the connection of the hoses 5 to a vehicle-carried source of hydraulic medium is not shown.
• Figs. 2-4 illustrate a first embodiment of the rotator 10 according to the invention
• said rotator 10 includes a stator 20 and a rotor 30.
• the stator comprises i.a. an upper stator wall 21 provided, at an upper side, with attachment means 22, preferably in the form of two attachment lugs 22a, 22b arranged in pairs, for swiningly attachment to the tip 2 of the
• stator ring 23 and a lower wall 24, which is connected, via the stator ring 23, to the upper stator wall 21 preferably by bolts 25.
• the rotor 30 being rotationally contained within the stator 20 by said upper and lower wall 21,24 and said stator ring 23.
• a device 40,50 for determining the absolute position of rotation between the stator 20 and the rotor 30 is arranged at the lower wall 24 of the rotator 10, and signals from the device 40,50 being transmitted to a processor means (not shown) either by wired or wireless communication for further processing.
• the processor means receives sensor signals from the sensor and process said signals for determining the absolute position of rotation between the stator 20 and the rotor 30.
• the processor means may e.g. be a CPU configured to execute suitable detection or determining algorithms in this respect.
• the CPU may be a dedicated processor unit or a processor unit also configured to perform other processing.
• the processor means may also use the determination of the absolute position in one or more control algorithms for controlling the rotator, the jib-carried tool or any associated cranes, machines, motor vehicles, etc. Therefore, the processor means may also output one or more control signals for controlling the rotator, the jib-carried tool or any associated cranes, machines, or motor vehicles .
• said device 40,50 for determining the absolute position of rotation comprises an encoder 40 in the form of a ring shaped magnetic means surrounding the rotor 30, as seen in radial direction of said rotor, and a sensor 50.
• said encoder 40 is arranged rotationally fixed relative to the stator 20
• said sensor 50 is arranged rotationally fixed relative to the rotor 30.
• said encoder 40 and said sensor 50 is arranged vice verse relative the stator 20 and the rotor 30, respectively.
• the encoder 40 has a groove 41 into which a protruding tip 51 of said sensor 50 protrudes so as to enabling determination of the absolute position of rotation between the stator 20 and the rotor 30.
• protruding tip 51 is adapted to run in said groove 41 and detect the changes in the magnetic field. To protect the groove 41 from the harsh environment
• a groove enclosing means 60 is arranged for enclosing said groove 41.
• Said groove enclosing means 60 has the form of a flat ring of sheet metal or
• the encoder 40 is preferably shaped as a U and the groove enclosing means 60 is adapted to abut the ends of the legs of the U via at least one intermediate sealing.
• the encoder 40 is provided with at least one sealing means 42 extending in the circumferential direction of the groove and arranged on each leg/side 43 of said groove 41 and at the end of each leg/side 43.
• the sealing means can be in the form of an O-ring arranged in a recess formed at the external end of each leg/side 43.
• said groove enclosing means 60 and said encoder 40 are enclosed between the lower wall 24 of the stator 20 and an upper wall 71 of an attachment 70 (Fig. 2) for the jib-carried tool.
• Said attachment 70 is detachably connected to the rotor 20.
• said tip 51 of said sensor 50 protrudes through a hole 61 in said groove enclosing means 60 and into said groove 41.
• a sealing (not shown) is provided between the sensor 50 and the groove enclosing means 60, and the sensor 40 is fixedly attached to the groove enclosing means 60.
• Said encoder 40 and said groove enclosing means 60 are
• the groove enclosing means 60 with attached sensor 50 is rotationally fixed relative to the attachment 70 which is arranged to rotate (by the rotor) relatively to the encoder 40 which is rotationally fixed relative to said lower wall 24 of the stator 20.
• the sensor 50 is arranged within a socket 55.
• at least one elastic means 80 is provided between the upper wall 71 of the attachment 70 and a lower wall 62 of said groove enclosing means 60 so as to bias said groove enclosing means against the sealing means 42.
• said at least one elastic means 80 consists of a plurality of spring means 80, preferably
• Figs.5-8 a second embodiment of the inventive rotator 10' is shown.
• the same technical means are denoted by the same reference characters as in the first embodiment with the exception of
• the main difference between the first and second embodiment is that, in the second embodiment, the device 40', 50' for
• a seat 90 is arranged which supports the encoder 40' . More particularly, the seat 90 has two ridges 92 enclosing a recess 91 in which the encoder 40' is confined.
• the seat 90 together with the encoder 40' is biased towards the groove enclosing means 60' by said at least one elastic means 80' as in the first embodiment so as to seal the groove 41 from the environment.
• each ridge 92 of the seat 90 can be provided with a sealing means possibly instead of the sealing means 42' or in combination with the sealing means 42' of the encoder 40' .
• the second embodiment of the rotator 10' is preferably used in the case the jib-carried tool is a grip.
• the groove enclosing means may be formed of either the upper wall 71 of the attachment 70 for the jib-carried tool or the lower wall 24 of the stator 20.
• at least one sealing is formed at least between said stator and said attachment for the jib-carried tool preferably at the periphery of a parting line between said stator and said attachment for the ib- carried tool.
• the sealing is arranged radially externally of the device 40,50; 40', 50' for determining the absolute
• the encoder 40,40' may or may not be provided with the sealing means 42, 42' .
• inventive rotator 10,10' is able to perform two- or three- dimensional movements, i.e. in case of three-dimensional movements the rotator being a so called tiltrotator.
• position of rotation comprises in a preferred embodiment a magnetic field sensor 50; 50' and an encoder 40; 40' in the form of a ring shaped encoder body 40; 40' having multiple magnetic regions producing characteristics for magnetic fields, where each magnetic field comprises a radial and axial magnetic field component.
• the magnetic field components are combined to a magnetic field vector.
• the magnetic field vector is inclined at a certain angle against the ring plane, where the angle changes along a periphery of the encoder body.
• This enables the magnetic field sensor 50; 50' to determine a specific point along the periphery of the encoder body 40; 40', i.e. an absolute position along the periphery of the encoder body without having to refer to a zero point.
• the absolute position of rotation between the stator 20;20' and the rotor 30; 30' can be provided.
• a device of this type if known by EP 2 568 259 Al .

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Structural Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Civil Engineering (AREA)
• Automation & Control Theory (AREA)
• Life Sciences & Earth Sciences (AREA)
• Biodiversity & Conservation Biology (AREA)
• Environmental Sciences (AREA)
• Forests & Forestry (AREA)
• Ecology (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 2014
  • 2014-12-19 SE SE1451592A patent/SE538568C2/en unknown
• 2015
  • 2015-10-12 EP EP15870448.6A patent/EP3234509A4/de not_active Withdrawn
  • 2015-10-12 WO PCT/SE2015/051080 patent/WO2016099372A1/en active Application Filing

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