WO2016099372A1 - Rotator for a jib-carried tool - Google Patents

Rotator for a jib-carried tool Download PDF

Info

Publication number
WO2016099372A1
WO2016099372A1 PCT/SE2015/051080 SE2015051080W WO2016099372A1 WO 2016099372 A1 WO2016099372 A1 WO 2016099372A1 SE 2015051080 W SE2015051080 W SE 2015051080W WO 2016099372 A1 WO2016099372 A1 WO 2016099372A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotator
groove
encoder
stator
rotor
Prior art date
Application number
PCT/SE2015/051080
Other languages
French (fr)
Inventor
Joakim Harr
Original Assignee
Indexator Rotator Systems Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Indexator Rotator Systems Ab filed Critical Indexator Rotator Systems Ab
Priority to EP15870448.6A priority Critical patent/EP3234509A4/en
Publication of WO2016099372A1 publication Critical patent/WO2016099372A1/en

Links

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 .

Landscapes

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

Abstract

The invention relates to rotator (10) for a jib-carried tool, said rotator comprising a stator (20) and a rotor (30) and a device (40, 50) for determining an absolute position of rotation between the stator (20) and the rotor (30). Said device (40, 50) comprises an encoder (40) surrounding the rotor (30; 30') and a sensor (50). The encoder (40) is arranged rotationally fixed relative to the stator (20) and the sensor (50) is arranged rotationally fixed relative to the rotor (30), or vice versa. Said sensor (50) is arranged to determine the absolute position of rotation between the stator (20) and the rotor (30).

Description

ROTATOR FOR A JIB-CARRIED TOOL
Field of the Invention The invention relates to a rotator for a jig-carried tool in accordance with the preamble of claim 1.
Background of the Invention
A problem experienced with rotators for a jig-carried
tool/working implement at an external end of a crane arm or jib resides in the ability to i.a. orientate hoses and
possibly also cables in a rotational manner in respect of the driver of a vehicle provided with said crane arm or jib. The driver must constantly be on his/her guard with regard to the choice of tool rotation, so as to avoid hose breakages.
Externally disposed hose loops are vulnerable to damage and consequently discrete or protected hose orientation is
desirable .
It is known to provide 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. However, by 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.
Due to increased automatization in forestry there is a demand for forwarders having automatically guided tools/working implements, such as grips, and also for wood harvesters having automatically guided harvesting units, so that the position of rotation of the tool can be determined, preferably the
absolute position. This enables repeating movements, for instance, of the tool can be programmed and thus the work of the driver much simplified. By such programming, also less skilled drivers will increase their performance.
Moreover, by such automatically guided tools the precision of positioning the tools will be much improved, and it will also be possible to reduce the linear velocity of pistons of hydraulic cylinders at its end positions so as to reduce impacts .
Furthermore, by such automatization it will be possible to detect when the rotator approaches the set target angle of rotation and thereby start a decelerating of the rotation of the rotator and thus the load carried by the rotator so as to be able to avoid over-rotation of the rotator.
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
automatization to be achieved.
Furthermore, by the inventive rotator it is also possible to prevent hose breakages and cable breakages as a result of wrong rotation of the tool.
Moreover, by 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. Summary of the Invention
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
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
surrounding the rotor, and further comprises a sensor, that said sensor being able to determine the absolute position of rotation between the stator and the rotor, and that said encoder being arranged rotationally fixed relative to the stator and the sensor being arranged rotationally fixed relative to the rotor, or vice versa.
Embodiments of the invention are defined in the appended dependent claims. Brief Description of the Drawings
The invention is described in more detail below in the form of a non-limiting example, reference being made to the
accompanying drawing, in which
- 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, and
- Fig. 8 shows the same view as in Fig. 7 but upside-down. Detailed Description of Preferred Embodiments
Regarding expressions such as upper and lower wall these are to be understood as seen in relation to Fig. 1 of the rotator.
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
3. 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
machine-carried jib/crane arm 3, a 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.
As seen in Fig. 2, 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.
Hence, according to an embodiment of the present invention, 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 .
From Figs. 2 to 4 it can be seen that 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. In the embodiment shown, said encoder 40 is arranged rotationally fixed relative to the stator 20, and said sensor 50 is arranged rotationally fixed relative to the rotor 30. In a second embodiment, to be described below, said encoder 40 and said sensor 50 is arranged vice verse relative the stator 20 and the rotor 30, respectively.
In a preferred embodiment, as seen in Figs. 2 and 4, 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. Thus, upon rotation of the rotor 30 the
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
experienced by the rotator 10, such as debris from processed timbers, water, sand, etc. 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
plastic, for instance. More particularly, 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. In one embodiment 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.
More particular, 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.
As shown in Figs. 2-4 said tip 51 of said sensor 50 protrudes through a hole 61 in said groove enclosing means 60 and into said groove 41. Possibly 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
arranged to rotate relative to each other during operation of said rotator 1.
More particular, in the embodiment shown in Fig. 2-4, which preferably is used in the case the jib-carried tool is a harvesting unit, 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. Preferably the sensor 50 is arranged within a socket 55. To improve the sealing between the sealing means 42 and the groove enclosing means 60 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. In a preferred embodiment said at least one elastic means 80 consists of a plurality of spring means 80, preferably
compression springs.
In Figs.5-8 a second embodiment of the inventive rotator 10' is shown. In the second embodiment 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
determining the absolute position of rotation between the stator 20' and the rotor 30' has been arranged reversed, that is to say that the encoder 40' is arranged rotationally fixed relative to the rotor 30' , and the sensor 50' is arranged rotationally fixed relative to the stator 30' . This means that the orientation of the encoder 40' and sensor 50' is upside- down as compared to the orientation of the encoder 40 and sensor 50 in the first embodiment.
As shown in Figs. 5, 7 and 8 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. In an embodiment not shown 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.
In a third embodiment of the inventive rotator (not shown) 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. In such a case 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
position of rotation. In such case the encoder 40,40' may or may not be provided with the sealing means 42, 42' .
Although, not shown on the drawings, it should be noted that the 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.
The device 40,50; 40', 50' for determining the absolute
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. Thereby, 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 .
Furthermore, by using a magnetic device for determining the absolute position of rotation there are no mechanical means that can be worn out. The invention is thus not limited to what is described and shown, since modifications and variations are naturally possible within the scope of the accompanying claims.

Claims

Claims
1. A rotator (10; 10') for a jib-carried tool, said rotator comprising a stator (20:20') and a rotor (30;30'),
characterized in
that said rotator (30; 30') comprises a device (40, 50; 40', 50') for determining an absolute position of rotation between the stator (20:20') and the rotor (30;30'),
that said device (40,50; 40', 50') for determining the absolute position of rotation comprises an encoder (40;40') in the form of a ring shaped magnetic means surrounding the rotor (30;30'), and further comprises a sensor (50;50'), said sensor (50;50') being able to determine the absolute position of rotation between the stator (20;20') and the rotor (30; 30' ) ; and
that said encoder (40;40') being arranged rotationally fixed relative to the stator (20:20') and the sensor
(50;50') being arranged rotationally fixed relative to the rotor (30;30'), or vice versa.
2. The rotator (10; 10') according to claim 1, characterized in that said encoder (40;40') is provided with a groove (41;41' ) ;
that said sensor (50;50') is provided with a protruding tip (51;51') arranged to protrude into said groove (41;41') of said encoder (40;40') so as to run in said groove
(41; 41') upon rotation of the rotor (30; 30') ; and
that a groove enclosing means ( 60 ; 60 ' ; 71 , 24 ; 71 ' , 24 ' ) is arranged for enclosing said groove (41;41') of the encoder
(40; 40') from an environment of the rotator (10; 10') .
3. The rotator (10; 10') according to claim 2, characterized in that said groove enclosing means ( 60 ; 60 ' ; 71 , 24 ; 71 ' , 24 ' ) and said encoder (40;40') are arranged to rotate relative to each other during operation of said rotator (10; 10') .
4. The rotator (10; 10') according to claim 2 or 3,
characterized in that said groove enclosing means (60;60') is formed as a flat ring, and that said tip (51;51') of said sensor (50;51') protrudes through a hole (61; 61') in said groove enclosing means (60; 60') and into said groove
( 41 ; 41 ' ) .
5. The rotator (10; 10') according to any one of claim 2 to
4, characterized in that said groove (41;41') of said encoder (40;40') is provided with at least one sealing means
(42,42') extending in the circumferential direction of the groove and on each side of said groove, and that said sealing means (42,42') are adapted to cooperate with the groove enclosing means (60; 60') so as to seal said grove ( 41 ; 41 ' ) .
6. The rotator (10; 10') according to any one of claims 2 to
5, characterized in that at least said groove enclosing means (60; 60') and said encoder (40;40') are enclosed between a lower wall (24;24') of the stator (20;20') and an upper wall (71; 71') of an attachment (70; 70') for the ib- carried tool, said attachment being detachably connected to the rotor (30; 30' ) .
7. The rotator (10) according to any one of claims 1 to 6, characterized in that said encoder (40) is rotationally fixed relative to the stator (20), and that said groove enclosing means (60) is rotationally fixed relative to the rotor (30), preferably via an attachment (70) for the ib- carried tool, said attachment being detachably connected to the rotor (30) .
8. The rotator (10') according to any one of claims 1 to 6, characterized in that said encoder (40') is rotationally fixed relative to the rotor (30'), and that said groove enclosing means (60') is rotationally fixed relative to the stator (30'), preferably via an attachment (70') for the jib-carried tool.
9. The rotator (10') according to claim 8, characterized in that a seat (90) is provided for rotationally fixation of the encoder (40') relative to the attachment (70') for the jib-carried tool.
10. The rotator (10; 10') according to any one of claims 6 to 9, characterized in that at least one elastic means (80; 80') is provided between an upper wall (71;71') of said
attachment (70;70') and a lower wall (24;24') of said groove enclosing means (60; 60') so as to bias said groove enclosing means against the sealing means (42;42') of the encoder ( 40 ; 40 ' ) .
11. The rotator (10; 10') according to claim 10,
characterized in that said at least one elastic means
(80;80') consists of a plurality of spring means (80;80'), preferably compression springs.
12. The rotator (10; 10') according to claim 2,
characterized in that said groove enclosing means
( 71 , 24 ; 71 ' 24 ' ) is formed by either an upper wall (71;71') of an attachment (70;70') for the jib-carried tool or a lower wall (24;24') of the stator (20;20'), and that at least one sealing is formed at least between said lower wall (24;24') of said stator (20;20') and said upper wall (71;71') of attachment (70;70') preferably at the periphery of said stator and said attachment for the jib-carried tool.
13. The rotator (10; 10') according to any one of claims 1 to
11, characterized in that signals from the device (40, 50; 40', 50') for determining the absolute position of rotation being transferred to a processor means either by wired or wireless connection for further processing.
14. The rotator (10; 10') according to any one of claims 1 to
12, characterized in that said rotator (10; 10') is connected via a link arrangement or a swing damper (4) to a tip (2) of a j ib ( 3 ) .
15. The rotator (10; 10') according to any one of claims 1 to
14, characterized in that said rotator (10; 10') is able to perform two- or three-dimensional movements.
16. The rotator (10; 10') according to any one of claims 1-
15, characterized in said sensor (50;50') is a magnetic field sensor and said encoder (40;40') comprises a body having multiple magnetic regions producing characteristics for magnetic fields.
PCT/SE2015/051080 2014-12-19 2015-10-12 Rotator for a jib-carried tool WO2016099372A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15870448.6A EP3234509A4 (en) 2014-12-19 2015-10-12 Rotator for a jib-carried tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1451592-8 2014-12-19
SE1451592A SE538568C2 (en) 2014-12-19 2014-12-19 Rotator for a jib-carried tool

Publications (1)

Publication Number Publication Date
WO2016099372A1 true WO2016099372A1 (en) 2016-06-23

Family

ID=56127068

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2015/051080 WO2016099372A1 (en) 2014-12-19 2015-10-12 Rotator for a jib-carried tool

Country Status (3)

Country Link
EP (1) EP3234509A4 (en)
SE (1) SE538568C2 (en)
WO (1) WO2016099372A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018038676A1 (en) * 2016-08-26 2018-03-01 Indexator Rotator Systems Ab Rotator arrangement
WO2018038675A1 (en) * 2016-08-26 2018-03-01 Indexator Rotator Systems Ab Rotator arrangement
WO2018162424A1 (en) * 2017-03-06 2018-09-13 Indexator Rotator Systems Ab Rotator arrangement with an angle meter
EP3388385A1 (en) * 2017-04-12 2018-10-17 EPSILON Kran GmbH. Rotation drive
US10161424B2 (en) 2016-01-26 2018-12-25 2141632 Ontario Inc. Hydraulic rotary manifold
WO2020076212A1 (en) * 2018-10-12 2020-04-16 Indexator Rotator System Ab Arrangement for controlling a rotator by image sensing means
US11937554B2 (en) 2017-01-10 2024-03-26 Ponsse Oyj Method and arrangement to control the operation of a wood-handling device in a work machine, and a forest machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080670A1 (en) * 1981-11-25 1983-06-08 Heinz Thumm Oelhydraulische Antriebe GmbH Rotation device for suspended loads
EP0409748A1 (en) * 1989-07-18 1991-01-23 Potain Motorized device for rotating loads, with self-supply of energy, for cable-hoisting gears
WO2003068655A1 (en) * 2002-01-21 2003-08-21 Indexator Ab Rotator
WO2003082725A1 (en) * 2002-04-02 2003-10-09 Indexator Ab Arrangement at a rotator
WO2012042154A1 (en) * 2010-09-29 2012-04-05 Moving Magnet Technologies Improved position sensor
EP2568259A1 (en) * 2011-09-06 2013-03-13 Carl Freudenberg KG Encoder ring and system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2028450A2 (en) * 2007-07-27 2009-02-25 Melexis NV Position sensor
JP5671255B2 (en) * 2009-06-30 2015-02-18 Ntn株式会社 Rotation angle detection device for motor for driving automobile and bearing with rotation angle detection device
DE102012202404B4 (en) * 2012-02-16 2018-04-05 Infineon Technologies Ag Angle of rotation sensor for absolute rotation angle determination even with multiple revolutions

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080670A1 (en) * 1981-11-25 1983-06-08 Heinz Thumm Oelhydraulische Antriebe GmbH Rotation device for suspended loads
EP0409748A1 (en) * 1989-07-18 1991-01-23 Potain Motorized device for rotating loads, with self-supply of energy, for cable-hoisting gears
WO2003068655A1 (en) * 2002-01-21 2003-08-21 Indexator Ab Rotator
WO2003082725A1 (en) * 2002-04-02 2003-10-09 Indexator Ab Arrangement at a rotator
WO2012042154A1 (en) * 2010-09-29 2012-04-05 Moving Magnet Technologies Improved position sensor
EP2568259A1 (en) * 2011-09-06 2013-03-13 Carl Freudenberg KG Encoder ring and system

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10161424B2 (en) 2016-01-26 2018-12-25 2141632 Ontario Inc. Hydraulic rotary manifold
WO2018038675A1 (en) * 2016-08-26 2018-03-01 Indexator Rotator Systems Ab Rotator arrangement
WO2018038677A1 (en) * 2016-08-26 2018-03-01 Indexator Rotator Systems Ab Rotator arrangement
RU2735199C2 (en) * 2016-08-26 2020-10-28 Индексатор Ротейтор Системз Аб Rotary device
WO2018038676A1 (en) * 2016-08-26 2018-03-01 Indexator Rotator Systems Ab Rotator arrangement
US11937554B2 (en) 2017-01-10 2024-03-26 Ponsse Oyj Method and arrangement to control the operation of a wood-handling device in a work machine, and a forest machine
US10808380B2 (en) 2017-03-06 2020-10-20 Indexator Rotator Systems Ab Rotator arrangement with an angle meter
WO2018162424A1 (en) * 2017-03-06 2018-09-13 Indexator Rotator Systems Ab Rotator arrangement with an angle meter
RU2746741C2 (en) * 2017-03-06 2021-04-20 Индексатор Ротейтор Системз Аб Turning device with inclinometer
KR102094070B1 (en) * 2017-04-12 2020-03-27 엡실론 크란 게엠베하. Hydraulic rotational drive
RU2709232C2 (en) * 2017-04-12 2019-12-18 Эпзилон Кран Гмбх. Rotation drive
US10927863B2 (en) 2017-04-12 2021-02-23 Epsilon Kran Gmbh Hydraulic rotational drive
KR20180115231A (en) * 2017-04-12 2018-10-22 엡실론 크란 게엠베하. Hydraulic rotational drive
EP3388385B1 (en) 2017-04-12 2021-09-08 EPSILON Kran GmbH. Rotation drive
EP3388385A1 (en) * 2017-04-12 2018-10-17 EPSILON Kran GmbH. Rotation drive
WO2020076212A1 (en) * 2018-10-12 2020-04-16 Indexator Rotator System Ab Arrangement for controlling a rotator by image sensing means

Also Published As

Publication number Publication date
SE1451592A1 (en) 2016-06-20
EP3234509A4 (en) 2018-08-29
EP3234509A1 (en) 2017-10-25
SE538568C2 (en) 2016-09-20

Similar Documents

Publication Publication Date Title
EP3234509A1 (en) Rotator for a jib-carried tool
US10151191B2 (en) Apparatus, rock drilling rig and method for rock drilling
CA3027844C (en) Hose guiding device for a crane tool
KR20070099448A (en) Crane arm having a fixing device for working implements
EP2645069B1 (en) Rotary sensor assembly
EP3321426B1 (en) Excavator having rotatable arm
CN103372813A (en) Cover device with dust suction device when used with electric tool
US7954524B2 (en) Motors and processing units for processing trees
US11365526B2 (en) Structure of a rotation device, and a corresponding rotation device, and a forest machine
US20200206887A1 (en) Power tool and method
SE1650805A1 (en) Improved arrangement and method for operating a hydraulic cylinder
US8721248B2 (en) Rotator
US20210154819A1 (en) Power tool and method
CN112352490A (en) Double-cylinder hydraulic lifter for tractor
KR102094070B1 (en) Hydraulic rotational drive
WO2017111684A1 (en) Device for a jib-carried tool and a system thereof
CN109382798A (en) Protective device for hand held power machine
US20210387833A1 (en) Arrangement for controlling a rotator by image sensing means
CN109253157A (en) A kind of wire wheel docking bushing device
CN107289290A (en) Reductor protection column with chamfering
CN107289275A (en) Workshop with circular arc wear-resistant protection device
CN107289292A (en) Wear-resisting reducer protecting device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15870448

Country of ref document: EP

Kind code of ref document: A1

REEP Request for entry into the european phase

Ref document number: 2015870448

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE