EP3868956A1 - Asphaltfertiger - Google Patents

Asphaltfertiger Download PDF

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Publication number
EP3868956A1
EP3868956A1 EP19872842.0A EP19872842A EP3868956A1 EP 3868956 A1 EP3868956 A1 EP 3868956A1 EP 19872842 A EP19872842 A EP 19872842A EP 3868956 A1 EP3868956 A1 EP 3868956A1
Authority
EP
European Patent Office
Prior art keywords
screed
extendable
guide shaft
plate
cylinder
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP19872842.0A
Other languages
English (en)
French (fr)
Other versions
EP3868956A4 (de
Inventor
Kouji Tameike
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo SHI Construction Machinery Co Ltd
Original Assignee
Sumitomo SHI Construction Machinery Co Ltd
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 Sumitomo SHI Construction Machinery Co Ltd filed Critical Sumitomo SHI Construction Machinery Co Ltd
Publication of EP3868956A1 publication Critical patent/EP3868956A1/de
Publication of EP3868956A4 publication Critical patent/EP3868956A4/de
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
    • E01C2301/10—Heated screeds
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
    • E01C2301/14—Extendable screeds
    • E01C2301/16—Laterally slidable screeds

Definitions

  • the present disclosure relates to an asphalt finisher.
  • An asphalt finisher including an extendable screed that can extend and retract in a vehicle-width direction is known (see Patent Document 1).
  • This asphalt finisher can increase the width of the paved road by extending the extendable screed in the vehicle-width direction.
  • Patent Document 1 Japanese Unexamined Patent Publication No. H11-350418
  • An asphalt finisher includes a tractor, a hopper provided on a front side of the tractor and configured to receive a pavement material, a conveyor configured to convey the pavement material in the hopper to a rear side of the tractor, a screw configured to lay and spread, at a rear side of the tractor, the pavement material conveyed by the conveyor, and a screed configured to lay and level, at a rear side of the screw, the pavement material laid and spread by the screw, wherein the screed includes a main screed and an extendable screed that are offset relative to each other so as not to overlap with each other in a vehicle-length direction, the extendable screed is supported by a first guide shaft and a second guide shaft, and each of the first guide shaft and the second guide shaft is prevented from rotating by detents at both ends thereof, and one of the detents at one end is provided within a width of the main screed.
  • an asphalt finisher having an extendable screed with a high degree of rigidity is provided.
  • FIG. 1A and FIG. 1B are schematic drawings of an asphalt finisher 100 according to the embodiment of the present invention.
  • FIG. 1A is a side view and
  • FIG. 1B is a plan view of the asphalt finisher 100.
  • the asphalt finisher 100 is primarily constituted by a tractor 1, a hopper 2, and a screed 3.
  • the asphalt finisher 100 is provided so that the vehicle-length direction corresponds to the X axis direction and the vehicle-width direction corresponds to the Y axis direction.
  • the Z axis is arranged so as to be orthogonal to each of the X axis and the Y axis.
  • the front side in the vehicle-length direction corresponds to the +X side
  • the rear side in the vehicle-length direction corresponds to the -X side
  • the left side in the vehicle-width direction corresponds to the +Y side
  • the right side in the vehicle-width direction corresponds to the -Y side
  • the upper side in the vertical direction corresponds to the +Z side
  • the lower side in the vertical direction corresponds to the -Z side.
  • the tractor 1 is a mechanism for causing the asphalt finisher 100 to travel.
  • the tractor 1 rotates rear wheels 5 by using rear-wheel traction motors, and rotates front wheels 6 by using front-wheel traction motors, to move the asphalt finisher 100.
  • the rear-wheel traction motors and the front-wheel traction motors are hydraulic motors that receive supply of hydraulic oil from the hydraulic pump, to rotate.
  • the tractor 1 may have crawlers in place of wheels.
  • a controller 50 is a control device to control the asphalt finisher 100.
  • the controller 50 is a microcomputer including a CPU, a volatile storage device, and a non-volatile storage device, and installed in the tractor 1.
  • various functions of the controller 50 are implemented by the CPU executing programs stored in the non-volatile storage device.
  • the hopper 2 is a mechanism for receiving pavement materials.
  • the pavement materials include, for example, asphalt mixed materials and the like.
  • the hopper 2 is provided on the front side (the +X side) of the tractor 1, and is configured to be openable and closable in the Y axis direction (vehicle-width direction) by the hopper cylinder 24.
  • the asphalt finisher 100 usually receives pavement materials from the bed of the dump truck by causing the hopper 2 to be in the completely open state.
  • FIG. 1A and FIG. 1B indicate that the hopper 2 is in the completely open state.
  • the hopper 2 is closed, and the pavement material remaining near the inner walls of the hopper 2 is collected to be gathered at the center of the hopper 2.
  • the pavement material fed to the rear side (the -X side) of the tractor 1 is laid and spread by a screw SC in the vehicle-width direction at the rear side of the tractor 1 and at the front side of the screed 3.
  • the pavement material laid and spread by the screw SC is indicated by a cross pattern.
  • the screed 3 is a mechanism for laying and leveling the pavement material.
  • the screed 3 is primarily constituted by a main screed 30 and an extendable screed 31.
  • the extendable screed 31 includes a left extendable screed 31L and a right extendable screed 31R.
  • the screed 3 is a floating screed towed by the tractor 1 and connected to the tractor 1 via leveling arms 3A. The screed 3 is moved upward and downward together with the leveling arms 3A by extension and retraction of screed lift cylinders 25.
  • the leveling arm 3A is configured so that the screed 3 can be connected to the tractor 1. Specifically, the leveling arm 3A has one end connected to the screed 3 and the other end rotatably connected to the tractor 1.
  • the leveling cylinder 23 is a hydraulic cylinder for moving upward and downward the front end portion of the leveling arm 3A in order to adjust the thickness of the pavement material laid and leveled.
  • the leveling cylinder 23 has a cylinder portion connected to the tractor 1 and a rod portion connected to a connection portion between the leveling arm 3A and the tractor 1.
  • the connection portion is configured to be movable upward and downward.
  • the controller 50 causes the hydraulic oil in the rod side oil chamber of the leveling cylinder 23 to flow out to cause the leveling cylinder 23 to extend, so that the leveling arm 3A is lowered.
  • the screed lift cylinder 25 is a hydraulic cylinder for raising the screed 3.
  • the screed lift cylinder 25 has a cylinder portion connected to the tractor 1 and a rod portion connected to the rear end portion of the leveling arm 3A.
  • the controller 50 causes the hydraulic oil discharged by the hydraulic pump to flow into the rod side oil chamber of the screed lift cylinder 25.
  • the screed lift cylinder 25 retracts, so that the rear end portion of the leveling arm 3A ascends, and accordingly, the screed 3 ascends.
  • the controller 50 allows the hydraulic oil in the rod side oil chamber of the screed lift cylinder 25 to flow out.
  • the screed lift cylinder 25 extends due to the weight of the screed 3, so that the rear end portion of the leveling arm 3A descends, and accordingly, the screed 3 descends.
  • the distal end of the extendable screed 31 is attached to a side plate 40.
  • the side plate 40 includes a left side plate 40L and a right side plate 40R. Specifically, the distal end (the left end) of the left extendable screed 31L is attached to the left side plate 40L, and the distal end (the right end) of the right extendable screed 31R is attached to the right side plate 40R.
  • the side plate 40 is also attached to a distal end of an extendable moldboard 41.
  • the extendable moldboard 41 is a member for adjusting the amount of pavement material remaining on the front side of the extendable screed 31 from among the pavement material laid and spread by the screw SC, and is configured to extend and retract in the vehicle-width direction together with the extendable screed 31.
  • the extendable moldboard 41 includes a left extendable moldboard 41L and a right extendable moldboard 41R. Specifically, the distal end (the left end) of the left extendable moldboard 41L is attached to the left side plate 40L, and the distal end (the right end) of the right extendable moldboard 41R is attached to the right side plate 40R.
  • the extendable moldboard 41 is configured to be able to adjust the height in the Z axis direction irrespective of the extendable screed 31 and the side plate 40. By moving upward and downward the extendable moldboard 41, the asphalt finisher 100 can adjust the amount of pavement material remaining on the front side of the extendable screed 31, and can also adjust the amount of pavement material retrieved into the lower side of the extendable screed 31.
  • the screed step 42 is a member that constitutes the scaffolding when the operator works behind the screed 3.
  • the screed step 42 includes a left screed step 42L, a center screed step 42C, and a right screed step 42R.
  • FIG. 3 is a plan view of the screed 3 in which both of the left extendable screed 31L and the right extendable screed 31R are in the fully extended state.
  • FIG. 4 is a rear view of the screed 3 in which both of the left extendable screed 31L and the right extendable screed 31R are in the fully extended state.
  • each of the main screed 30, the left extendable screed 31L, and the right extendable screed 31R is individually provided with a vibrator, a tamper device, a strike-off plate, a heater and the like.
  • a vibrator is a vibrating device for compacting a pavement surface.
  • the vibrator is an eccentric vibrator driven by a hydraulic motor.
  • the vibrator may be driven by an electric motor or may be a linear vibrator such as a piston vibrator.
  • the tamper device TP is a device for moving the tamper edge TE upward and downward.
  • the tamper edge TE is configured to be able to tamp the laid and spread pavement material with the bottom edge portion.
  • the tamper device TP includes a center tamper device (not illustrated) mounted on the main screed 30, a left tamper device TPL mounted on the left extendable screed 31L, and a right tamper device TPR mounted on the right extendable screed 31R.
  • the left tamper device TPL is primarily constituted by a tamper edge TE, a tamper rotation driving unit TM, a tamper rotation shaft TX, an outer tamper rod portion TRD, and an inner tamper rod portion TRP.
  • the center tamper device and the right tamper device TPR are also configured in a similar manner.
  • the tamper rotation driving unit TM is configured to be able to rotate the tamper rotation shaft TX.
  • the tamper rotation driving unit TM is a hydraulic motor that rotates by receiving supply of hydraulic oil from the hydraulic pump.
  • the outer tamper rod portion TRD and the inner tamper rod portion TRP constitute a mechanism that converts the rotation motion of the tamper rotation shaft TX into the vertical reciprocating motion of the tamper edge TE.
  • the outer tamper rod portion TRD is connected to an outer (distal side) end portion of the tamper rotation shaft TX
  • the inner tamper rod portion TRP is connected to an inner (proximal side) end portion of the tamper rotation shaft TX.
  • One or more additional tamper rod portions may be connected, along the tamper rotation shaft TX, between the outer tamper rod portion TRD and the inner tamper rod portion TRP.
  • the strike-off plate is provided on the front side of the tamper device, and is configured to be able to adjust the amount of supply of pavement material supplied to the tamper edge.
  • the strike-off plate is configured to be able to set an angle at which the pavement material laid and spread is loaded (the angle of attack) and a distance between the bottom edge of the strike-off plate and the roadbed (a height of the bottom edge of the strike-off plate relative to the roadbed).
  • the heater is provided to be in contact with the screed plate so that the screed plate can be heated.
  • the heater may be an electric heater or a gas heater.
  • the extendable screed 31 is primarily constituted by an extendable cylinder 60, a screed plate 61, a front plate 62, a guide shaft 63, a distal end plate 64, a proximal end plate 65, a distal end bracket 66, and a proximal end bracket 67.
  • the extendable cylinder 60 is supported by a support portion 55 fixed to the rear surface of the housing of the main screed 30, and is configured to allow the extendable screed 31 to extend or retract in the vehicle-width direction.
  • the extendable cylinder 60 includes a left extendable cylinder 60L and a right extendable cylinder 60R
  • the support portion 55 includes a left support portion 55L and a right support portion 55R.
  • the left extendable cylinder 60L is a hydraulic cylinder including a cylinder tube CT and a rod RD, and is supported by the left support portion 55L as illustrated in FIG. 3 .
  • the left extendable cylinder 60L is configured to be able to, on the front side relative to the right extendable screed 31R, allow the left extendable screed 31L to extend to the left side in the vehicle-width direction relative to the main screed 30.
  • the right extendable cylinder 60R is a hydraulic cylinder including a cylinder tube CT and a rod RD, and is supported by the right support portion 55R as illustrated in FIG. 3 .
  • the right extendable cylinder 60R is configured to be able to, on the rear side relative to the left extendable screed 31L, allow the right extendable screed 31R to extend to the right side in the vehicle-width direction relative to the main screed 30.
  • the screed plate 61 is a plate-shaped member constituting the bottom surface of the extendable screed 31. Specifically, as illustrated in FIG. 2A , the screed plate 61 includes a left screed plate 61L and a right screed plate 61R. The screed plate 61 is configured to be able to lay and level the pavement material tampered with the tamper device.
  • the front plate 62 is a plate-shaped member provided on the lower portion of the front surface of the extendable screed 31, and is configured to load the pavement material to the lower side of the screed plate 61 while pressing the pavement material forward.
  • the front plate 62 includes a left front plate 62L and a right front plate 62R.
  • the guide shaft 63 is a shaft extending in the vehicle-width direction to guide the extension and retraction of the extendable screed 31.
  • the guide shaft 63 is constituted by a metal pipe.
  • the guide shaft 63 includes a left guide shaft 63L and a right guide shaft 63R.
  • the left guide shaft 63L includes an upper left guide shaft 63TL and a lower left guide shaft 63BL which are arranged in the vertical direction with the left extendable cylinder 60L being interposed therebetween.
  • the right guide shaft 63R includes an upper right guide shaft 63TR and a lower right guide shaft 63BR which are arranged in the vertical direction with the right extendable cylinder 60R being interposed therebetween.
  • the distal end plate 64 is a plate-shaped member fixed to the distal end of the guide shaft 63.
  • the distal end plate 64 includes: a left distal end plate 64L fixed to distal ends (end portions on the +Y side) of the upper left guide shaft 63TL and the lower left guide shaft 63BL; and a right distal end plate 64R fixed to distal ends (end portions on the -Y side) of the upper right guide shaft 63TR and the lower right guide shaft 63BR.
  • the proximal end plate 65 is a plate-shaped member fixed to the proximal end of the guide shaft 63. Specifically, as illustrated in FIG. 4 , the proximal end plate 65 includes: a left proximal end plate 65L fixed to proximal ends (end portions on the -Y side) of the upper left guide shaft 63TL and the lower left guide shaft 63BL; and a right proximal end plate 65R fixed to proximal ends (end portions on the +Y side) of the upper right guide shaft 63TR and the lower right guide shaft 63BR.
  • the distal end bracket 66 is configured to connect the screed plate 61 and the distal end plate 64. Specifically, as illustrated in FIG. 4 , the distal end bracket 66 includes: a left distal end bracket 66L connecting the left distal end plate 64L and the distal end of the left screed plate 61L; and a right distal end bracket 66R connecting the right distal end plate 64R and the distal end of the right screed plate 61R.
  • the proximal end bracket 67 is configured to connect the screed plate 61 and the proximal end plate 65.
  • the proximal end bracket 67 includes: a left proximal end bracket 67L connecting the left proximal end plate 65L and the proximal end of the left screed plate 61L; and a right proximal end bracket 67R connecting the right proximal end plate 65R and the proximal end of the right screed plate 61R.
  • the left support portion 55L is fixed to the rear surface of the housing of the main screed 30, and includes a left outer plate 56L and a left inner plate 57L which are plate-shaped members extending from the main screed 30 to the rear side.
  • the right support portion 55R includes: a box portion 58 attached to the rear surface of the housing of the main screed 30; and a right outer plate 56R and a right inner plate 57R which are plate-shaped members extending from the rear surface of the box portion 58 to the rear side.
  • the cylinder tube CT of the left extendable cylinder 60L is rotatably attached to the left inner plate 57L.
  • the cylinder tube CT of the left extendable cylinder 60L is rotatably attached, at a single portion close to the left end portion, to the left inner plate 57L, and is accordingly configured such that the right end portion is in the non-fixed state.
  • the end (the left end) of the rod RD of the left extendable cylinder 60L is fixed to the left distal end plate 64L.
  • the left extendable cylinder 60L allows the rod RD to smoothly extend and retract because the extension direction of the cylinder tube CT can be aligned with the extendable direction of the rod RD.
  • the cylinder tube CT of the right extendable cylinder 60R is rotatably attached to the right inner plate 57R.
  • the cylinder tube CT is rotatably attached, at a single portion close to the right end portion, to the right inner plate 57R, and is accordingly configured such that the left end portion is in the non-fixed state.
  • the end (the right end) of the rod RD of the right extendable cylinder 60R is fixed to the right distal end plate 64R. According to this configuration, the right extendable cylinder 60R allows the rod RD to smoothly extend and retract because the extension direction of the cylinder tube CT can be aligned with the extendable direction of the rod RD.
  • FIG. 5 is a plan view of the screed 3 when both of the left extendable screed 31L and the right extendable screed 31R are in the fully extended state.
  • the left extendable screed 31L is configured so that a sum of a length W1 of protrusion thereof from the main screed 30 to the left side (the +Y side) in the fully extended state and a length W2 from the left end of the main screed 30 to the right end of the left proximal end plate 65L is equal to or less than a length W3 of the main screed 30.
  • the left extendable screed 31L is configured so that the sum of the length W1 and the length W2 is equal to the length W3. This is because, when the left extendable screed 31L fully retracts, the left end of the left extendable screed 31L does not protrude from the left end of the main screed 30.
  • the right extendable screed 31R is configured so that a sum of a length W4 of protrusion thereof from the main screed 30 to the right side (the -Y side) in the fully extended state and a length W5 from the right end of the main screed 30 to the left end of the right proximal end plate 65R is equal to or less than the length W3 of the main screed 30.
  • the right extendable screed 31R is configured so that the sum of the length W4 and the length W5 is equal to the length W3. This is because, when the right extendable screed 31R fully retracts, the right end of the right extendable screed 31R does not protrude from the right end of the main screed 30.
  • the left support portion 55L is configured so that a support width W6, i.e., a length between the left end of the left outer plate 56L and the right end of the left inner plate 57L, is less than the length W2.
  • a support width W6 i.e., a length between the left end of the left outer plate 56L and the right end of the left inner plate 57L
  • the left extendable cylinder 60L may have a stopper function for preventing an excessive extension of the rod RD in order to prevent an occurrence of such a situation. This is also applicable to the right extendable cylinder 60R.
  • the right support portion 55R is configured so that a support width W7, i.e., a length between the right end of the right outer plate 56R and the left end of the right inner plate 57R, is less than the length W5. This is to prevent the right inner plate 57R and the right proximal end plate 65R from coming into contact with each other when the right extendable screed 31R fully extends.
  • the asphalt finisher 100 can increase the width of the paved road twice or more (about three times) larger than when both of them fully retract. Furthermore, the asphalt finisher 100 can steplessly adjust the width of the paved road.
  • FIG. 6A to FIG. 6C are schematic drawings of the detent structure of the right guide shaft 63R.
  • FIG. 6A is a drawing of the right proximal end plate 65R as viewed from the +Y side, and corresponds to an enlarged drawing of a range R1 enclosed by a long dashed dotted line in FIG. 2B .
  • FIG. 6B is a cross-sectional view of the vertical plane (the YZ plane) including a line segment L3 of FIG. 6A as viewed from the -X side.
  • FIG. 6C is a cross-sectional view of the vertical plane (the YZ plane) including a line segment L4 of FIG. 6A as viewed from the -X side.
  • the detent structure of the proximal end (the left end) of the upper right guide shaft 63TR is explained as a typical example.
  • the following explanation can also be similarly applicable to the detent structure for each of the distal end (the right end) of the upper right guide shaft 63TR, the proximal end (the left end) and the distal end (the right end) of the lower right guide shaft 63BR, the proximal end (the left end) and the distal end (the right end) of the upper left guide shaft 63TL, and the proximal end (the left end) and the distal end (the right end) of the lower left guide shaft 63BL.
  • a first plate PL1 in a disk shape is welded to the proximal end (the left end) of the upper right guide shaft 63TR, and the first plate PL1 closes the proximal end (the left end).
  • the first plate PL1 is fastened to a second plate PL2 with six first bolts BT1.
  • the first bolt BT1 includes bolts BTla to BT1f.
  • the upper right guide shaft 63TR is inserted into a through hole H2 formed in the right outer plate 56R, a through hole H12 formed in the right inner plate 57R, and a through hole H22 formed in the right proximal end plate 65R.
  • the upper right guide shaft 63TR is slidably supported by the right outer plate 56R and the right inner plate 57R.
  • the right proximal end plate 65R, together with the upper right guide shaft 63TR, is movably supported.
  • the right proximal end plate 65R has, in its central portion, a through hole H5 in which the cylinder tube CT of the right extendable cylinder 60R is passed.
  • the second plate PL2 which is fastened to the first plate PL1 with the first bolts BT1, is fastened to the right proximal end plate 65R with four second bolts BT2.
  • the second bolt BT2 includes bolts BT2a to BT2d.
  • a recessed portion RC in a circular shape is formed so that the second plate PL2 is positioned with respect to the proximal end (the left end) of the upper right guide shaft 63TR.
  • the recessed portion RC may not be provided.
  • the proximal end (the left end) of the upper right guide shaft 63TR is prevented from rotating relative to the right proximal end plate 65R.
  • the proximal end (the left end) of the upper right guide shaft 63TR is prevented from rotating relative to the frame of the right extendable screed 31R.
  • the frame of the right extendable screed 31R includes the right screed plate 61R, the right front plate 62R, the right distal end plate 64R, and the right proximal end plate 65R.
  • the above is also similarly applicable to the distal end (the right end) of the upper right guide shaft 63TR, the proximal end (the left end) and the distal end (the right end) of the lower right guide shaft 63BR, the proximal end (the left end) and the distal end (the right end) of the upper left guide shaft 63TL, and the proximal end (the left end) and the distal end (the right end) of the lower left guide shaft 63BL.
  • FIG. 7 is a drawing of the right extendable screed 31R as seen from the -Y side.
  • members such as the right side plate 40R and the like that are other than the members constituting the right extendable screed 31R are omitted.
  • a height HT of FIG. 7 indicates a height, relative to the paved surface, of the pavement material that has passed under the right extendable moldboard 41R (see FIG. 1B ) and has come into contact with the right front plate 62R.
  • the right extendable screed 31R is configured to retrieve the pavement material into the lower side of the right screed plate 61R while the right front plate 62R attached to the front surface thereof pushes the pavement material.
  • the right extendable screed 31R receives, from the pavement material, a force for pushing up the right extendable screed 31R and a force for rotating the right extendable screed 31R in the counterclockwise direction about the center axis CX of the upper right guide shaft 63TR.
  • the right extendable screed 31R rotates in the counterclockwise direction about the center axis CX of the upper right guide shaft 63TR, as indicated by a long dashed double-dotted line and an arrow in FIG. 7 .
  • a relatively large torsional load is exerted on the right extendable cylinder 60R provided between the upper right guide shaft 63TR and the lower right guide shaft 63BR. This is because, in the right extendable cylinder 60R, the end (the right end) of the rod RD is fastened to the right distal end plate 64R with a third bolt BT3.
  • the right extendable screed 31R can inhibit or prevent the right extendable screed 31R from rotating in the counterclockwise direction about the center axis CX of the upper right guide shaft 63TR.
  • the upper right guide shaft 63TR is integrated with the frame of the right extendable screed 31R, and the rigidity of the entirety of the right extendable screed 31R is increased.
  • the detent structure can inhibit or prevent a relatively large torsional load from being exerted on the right extendable cylinder 60R.
  • FIG. 8A and FIG. 8B are drawings of the connection structure.
  • FIG. 8A is a drawing of the right inner plate 57R as viewed from the +Y side.
  • FIG. 8B is a drawing of a portion including a through hole H11 formed in the central portion of the right inner plate 57R, and corresponds to an enlarged drawing of a range R2 enclosed by a long dashed dotted line in FIG. 2B .
  • connection structure between the right extendable cylinder 60R and the right inner plate 57R is explained as a typical example. However, the following explanation is also similarly applicable to the connection structure between the left extendable cylinder 60L and the left inner plate 57L.
  • the right inner plate 57R includes through holes H11 to H13.
  • the through hole H12 is formed to be able to slidably receive and support the upper right guide shaft 63TR.
  • the through hole H13 is formed to be able to slidably receive and support the lower right guide shaft 63BR.
  • each of the left outer plate 56L, the right outer plate 56R, and the left inner plate 57L includes a through hole that slidably receives and supports the guide shaft 63.
  • the through hole H11 is formed to be able to receive and support the cylinder tube CT of the right extendable cylinder 60R.
  • the left inner plate 57L has a through hole that receives and supports the cylinder tube CT of the left extendable cylinder 60L.
  • a flange portion FL is attached to the cylinder tube CT of the right extendable cylinder 60R.
  • the flange portion FL is a plate-shaped member in a rounded rectangular shape welded to the periphery of the cylinder tube CT.
  • the flange portion FL is formed with a hole HL1 in a circular shape in an end surface in the -X side thereof and a hole HL2 in a circular shape in an end surface in the -X side thereof.
  • the hole HL1 is configured to receive an end of a pin PN1 inserted into a through hole BH formed in a back surface of the box portion 58 and a through hole TH1 formed in an end surface on the +X side of the right inner plate 57R.
  • the hole HL2 is configured to receive an end of a pin PN2 inserted into a through hole TH2 formed in an end surface on the -X side of the right inner plate 57R.
  • the flange portion FL, the pin PN1, and the pin PN2 constitute a trunnion structure.
  • This trunnion structure supports the flange portion FL rotatably about the axis indicated by a line segment L5. Specifically, this trunnion structure rotatably supports the cylinder tube CT welded to the flange portion FL.
  • the trunnion structure explained above is configured to be able to rotate the right extendable cylinder 60R about the axis parallel to the X axis
  • the trunnion structure may be configured to be able to rotate the right extendable cylinder 60R about an axis parallel to the Z axis.
  • the flange portion FL may have a pair of pins protruding to the outside.
  • the inner wall of the through hole H11 may be provided with a pair of holes for receiving the ends of the pair of pins.
  • the extendable screed may be provided with a gimbal structure allowing a rotation about the X axis and a rotation about the Z axis.
  • the hydraulic oil hoses for the extendable cylinder 60 include: a rod side hose 68 configured to be able to supply hydraulic oil to the rod side oil chamber and to discharge hydraulic oil from the rod side oil chamber of the extendable cylinder 60; and a bottom side hose 69 configured to be able to supply hydraulic oil to the bottom side oil chamber and to discharge hydraulic oil from the bottom side oil chamber of the extendable cylinder 60.
  • hydraulic oil hoses for the left extendable cylinder 60L include a left rod side hose 68L and a left bottom side hose 69L.
  • hydraulic oil hoses for the right extendable cylinder 60R include a right rod side hose 68R and a right bottom side hose 69R.
  • hydraulic oil hoses for the right extendable cylinder 60R are explained as a typical example. However, the following explanation is also similarly applicable to hydraulic oil hoses for the left extendable cylinder 60L.
  • both of the right rod side hose 68R and the right bottom side hose 69R are arranged to pass between the right outer plate 56R and the right inner plate 57R.
  • both of the right rod side hose 68R and the right bottom side hose 69R are arranged to pass within the support width W7 as illustrated in FIG. 5 .
  • This arrangement can prevent the right rod side hose 68R and the right bottom side hose 69R from being damaged by getting caught between the right inner plate 57R and the right proximal end plate 65R or between the right outer plate 56R and the right distal end plate 64R.
  • the right rod side hose 68R is connected to, between the right outer plate 56R and the right inner plate 57R, the rod side port of the cylinder tube CT constituting the right extendable cylinder 60R.
  • the right bottom side hose 69R extends from the -Y side (the right side) of the right inner plate 57R via the through hole H11 to the +Y side (the left side) of the right inner plate 57R. Then, as illustrated in FIG. 2A , the right bottom side hose 69R extends along the cylinder tube CT to the +Y side (the left side) to be connected to the bottom side port on the left end of the cylinder tube CT. Specifically, as illustrated in FIG.
  • the right bottom side hose 69R extends from the -Y side (the right side) of the right inner plate 57R, passes between the inner wall of the through hole H11 and the flange portion FL, and extends to the +Y side (the left side) of the right inner plate 57R.
  • a circular hatched range R3 in FIG. 8B represents a cross section of the right bottom side hose 69R.
  • FIG. 9 is a perspective drawing of the box portion 58.
  • the box portion 58 protrudes to the rear side from the back surface of the main screed 30, and is configured so as to extend over the movable range of the left extendable screed 31L and so as to be able to be attached with the right outer plate 56R and the right inner plate 57R.
  • the box portion 58 is constituted by a front surface plate 58F, a back surface plate 58B, a left side surface plate 58L, a right side surface plate 58R (see FIG. 2B ), and a top surface plate 58T.
  • the left side surface plate 58L is formed with a cutout CU that allows the left extendable screed 31L to pass through in the vehicle-width direction.
  • FIG. 2A indicates, with broken lines, a state in which the left proximal end plate 65L and the right end portion of each of the left extendable cylinder 60L, the left screed plate 61L, the left front plate 62L, the upper left guide shaft 63TL, and the lower left guide shaft 63BL constituting the left extendable screed 31L are housed in the box portion 58.
  • FIG. 3 indicates, with broken lines, a state in which only the right end portion of the cylinder tube CT of the left extendable cylinder 60L is remaining in the box portion 58. Specifically, FIG. 3 illustrates a state in which the left screed plate 61L, the left front plate 62L, the upper left guide shaft 63TL, the lower left guide shaft 63BL, and the left proximal end plate 65L are out of the box portion 58.
  • the box portion 58 is formed with the cutout CU so as to allow the left screed plate 61L, the left front plate 62L, the upper left guide shaft 63TL, the lower left guide shaft 63BL, and the left proximal end plate 65L to enter and come out of the box portion 58.
  • FIG. 10 is a plan view of the asphalt finisher 100.
  • FIG. 10 illustrates an arrangement of the vibrator VB and the tamper rotation driving unit TM of the tamper device TP.
  • the rod side hose 68, the bottom side hose 69, and the protective tube HS are omitted.
  • FIG. 11 is a rear view of the screed 3.
  • FIG. 11 illustrates the arrangement structure of the protective tube HS in detail.
  • FIG. 2A to FIG. 2C and FIG. 3 schematically illustrate the arrangement structure of the protective tube HS.
  • the protective tube HS is omitted.
  • the protective tube HS is a member for collectively protecting multiple hoses, and is provided from the tractor 1 to the extendable screed 31.
  • the protective tube HS includes: a left protective tube HSL for supplying hydraulic oil, gas, or the like to multiple devices mounted on the left extendable screed 31L; and a right protective tube HSR for supplying hydraulic oil, gas, or the like to multiple devices mounted on the right extendable screed 31R.
  • the multiple devices mounted on the left extendable screed 31L include a left tamper rotation driving unit TML, a left vibrator VBL, and a left heater HTL.
  • the multiple devices mounted on the right extendable screed 31R include a right tamper rotation driving unit TMR, a right vibrator VBR, and a right heater HTR.
  • the left protective tube HSL collectively protects: a hydraulic oil hose for supplying hydraulic oil to the left tamper rotation driving unit TML; a hydraulic oil hose for supplying hydraulic oil to the left vibrator VBL; and a gas hose for supplying gas to the left heater HTL.
  • the right protective tube HSR collectively protects: a hydraulic oil hose for supplying hydraulic oil to the right tamper rotation driving unit TMR; a hydraulic oil hose for supplying hydraulic oil to the right vibrator VBR; and a gas hose for supplying gas to the right heater HTR.
  • the protective tube HS protects electric cables, not illustrated, as well as other hoses.
  • the electric cables are signal cables that connect the controller 50 to each of a switch box, a heater switch, and a temperature sensor.
  • the protective tube HS may protect power cables together with other hoses.
  • the left protective tube HSL is provided to extend along the upper surface of the housing of the main screed 30, thereafter pass the upper side (the +Z side) of the upper left guide shaft 63TL, and further pass the rear side (the -X side) of each of the upper left guide shaft 63TL and the lower left guide shaft 63BL.
  • the right protective tube HSR is provided to extend along the upper surface of the housing of the main screed 30 and along the upper surface of the box portion 58, and thereafter extend between the rear surface of the box portion 58 and each of the upper right guide shaft 63TR and the lower right guide shaft 63BR.
  • the left protective tube HSL is fixed to the left extendable screed 31L, and at portions other than the distal end DE, the left protective tube HSL is not fixed to the left extendable screed 31L. Therefore, the left protective tube HSL is configured so that its arrangement position changes according to the extension and retraction of the left extendable screed 31L. Specifically, as illustrated in FIG. 2A , in a case where the left extendable screed 31L is in the slightly extended state, the left protective tube HSL is provided to cross the left extendable cylinder 60L at a position in proximity to the box portion 58 of the right support portion 55R. Conversely, as illustrated in FIG.
  • the left protective tube HSL is provided to cross the left extendable cylinder 60L at a position distant from the box portion 58. This is also applicable to the right protective tube HSR.
  • the protective tube HS can prevent multiple hoses, for supplying hydraulic oil, gas, or the like to the multiple devices mounted on the extendable screed 31, from spreading in a disorderly manner when the extendable screed 31 retracts. Therefore, the protective tube HS can prevent multiple hoses from being undesirably entangled with the devices, members, or the like mounted on the screed 3.
  • the asphalt finisher 100 includes the tractor 1, the hopper 2 provided on the front side of the tractor 1 and configured to receive pavement material, the conveyor CV configured to convey the pavement material in the hopper 2 to the rear side of the tractor 1, the screw SC configured to lay and spread, at the rear side of the tractor 1, the pavement material conveyed by the conveyor CV, and the screed 3 configured to lay and level, at the rear side of the screw SC, the pavement material laid and spread by the screw SC.
  • the screed 3 includes the main screed 30 and the extendable screed 31 which are offset relative to each other so as not to overlap with each other in the vehicle-length direction.
  • the extendable screed 31 includes the left extendable screed 31L and the right extendable screed 31R.
  • the left extendable screed 31L is supported by the upper left guide shaft 63TL serving as a first guide shaft and the lower left guide shaft 63BL serving as a second guide shaft. At both ends, each of the upper left guide shaft 63TL and the lower left guide shaft 63BL is prevented from rotating.
  • the right extendable screed 31R is supported by the upper right guide shaft 63TR serving as a first guide shaft and the lower right guide shaft 63BR serving as a second guide shaft. At both ends, the upper right guide shaft 63TR and the lower right guide shaft 63BR are prevented from rotating.
  • the asphalt finisher 100 can have the extendable screed 31 that has a high degree of rigidity, so that the durability of the asphalt finisher 100 as a whole can be improved.
  • the first guide shaft is preferably provided above the second guide shaft.
  • the upper left guide shaft 63TL is provided above the lower left guide shaft 63BL.
  • the upper right guide shaft 63TR is provided above the lower right guide shaft 63BR.
  • the hydraulic cylinder is provided between the first guide shaft and the second guide shaft.
  • the left extendable cylinder 60L is provided between the upper left guide shaft 63TL and the lower left guide shaft 63BL.
  • the right extendable cylinder 60R is provided between the upper right guide shaft 63TR and the lower right guide shaft 63BR.
  • the asphalt finisher 100 is configured so that the position of the extendable cylinder 60 and the position of the guide shaft 63 are the same in the vehicle-length direction. Specifically, the asphalt finisher 100 is configured so that the position of the left extendable cylinder 60L and the position of the left guide shaft 63L are the same in the vehicle-length direction, and the position of the right extendable cylinder 60R and the position of the right guide shaft 63R are the same in the vehicle-length direction. Therefore, as compared with the case where the position of the extendable cylinder 60 and the position of the guide shaft 63 are different in the vehicle-length direction, the asphalt finisher 100 can reduce the torsional load exerted on the extendable cylinder 60. As a result, the asphalt finisher 100 can increase the smoothness of the extension and retraction of the extendable cylinder 60.
  • the hydraulic cylinder is provided to be rotatable at one portion.
  • the right extendable cylinder 60R is rotatably attached to the right inner plate 57R via the flange portion FL.
  • This is also applicable to the left extendable cylinder 60L.
  • the asphalt finisher 100 can adjust the extension direction of the cylinder tube CT to be the same as the extendable direction of the rod RD, so that the smoothness of the extension and retraction of the extendable cylinder 60 can be further improved.
  • the first guide shaft and the second guide shaft are supported by the support portion 55 having a predetermined support width and attached to the main screed 30 so as to protrude from the main screed 30 in the vehicle-length direction.
  • the width W3 of the main screed 30 in the vehicle-width direction is configured to be larger than the sum of the support width and the stroke length of the hydraulic cylinder.
  • the upper left guide shaft 63TL and the lower left guide shaft 63BL are supported by the left support portion 55L having the support width W6.
  • the width W3 of the main screed 30 is configured to be larger than the sum of the support width W6 and the length W1 corresponding to the stroke length of the left extendable cylinder 60L.
  • the upper right guide shaft 63TR and the lower right guide shaft 63BR are supported by the right support portion 55R having the support width W7.
  • the width W3 of the main screed 30 is configured to be larger than the sum of the support width W7 and the length W4 corresponding to the stroke length of the right extendable cylinder 60R.
  • the asphalt finisher 100 can prevent the distal end of the extendable screed 31 from protruding from the end of the main screed 30 when the extendable screed 31 fully retracts. Specifically, the asphalt finisher 100 can completely retract the extendable cylinder 60 within the width W3 of the main screed 30.
  • the extendable screed 31 includes: the left extendable screed 31L serving as a first extendable screed; and the right extendable screed 31R serving as a second extendable screed provided at a position more distant from the main screed 30 than is the left extendable screed 31L in the vehicle-length direction.
  • the support portion 55 includes: the left support portion 55L serving as a first support portion for the left extendable screed 31L; and the right support portion 55R serving as a second support portion for the right extendable screed 31R.
  • the right support portion 55R is formed with a space capable of housing the left extendable screed 31L. For example, in the present embodiment, as illustrated in FIG.
  • the box portion 58 of the right support portion 55R is formed with the space SP capable of housing a portion of the left extendable screed 31L. According to this configuration, even in a case where the main screed 30, the left extendable screed 31L, and the right extendable screed 31R are arranged in the vehicle-length direction, the asphalt finisher 100 can completely retract the left extendable cylinder 60L within the width W3 of the main screed 30.
  • the hydraulic oil hose for supplying hydraulic oil to cause the hydraulic cylinder to extend and retract is preferably provided to pass within the support width.
  • the left rod side hose 68L and the left bottom side hose 69L supplying hydraulic oil for causing the left extendable cylinder 60L to extend and retract are arranged to pass with the support width W6 as illustrated in FIG. 5 .
  • the right rod side hose 68R and the right bottom side hose 69R supplying hydraulic oil for causing the right extendable cylinder 60R to extend and retract are arranged to pass within the support width W7 as illustrated in FIG. 5 .
  • the asphalt finisher 100 can prevent the hydraulic oil hoses for the extendable cylinder 60 from being damaged by getting caught between the inner plate 57 and the proximal end plate 65 or between the outer plate 56 and the distal end plate 64.
  • the left guide shaft 63L includes the upper left guide shaft 63TL and the lower left guide shaft 63BL arranged in the vertical direction with the left extendable cylinder 60L being interposed therebetween.
  • the right guide shaft 63R includes the upper right guide shaft 63TR and the lower right guide shaft 63BR arranged in the vertical direction with the right extendable cylinder 60R being interposed therebetween.
  • the left guide shaft 63L may include a front left guide shaft and a rear left guide shaft arranged in the longitudinal direction with the left extendable cylinder 60L interposed therebetween.
  • the right guide shaft 63R may include a front right guide shaft and a rear right guide shaft arranged in the longitudinal direction with the right extendable cylinder 60R interposed therebetween.
  • the screed 3 has a structure in which the strike-off plates are attached separately.
  • the strike-off plate may be integrated with the front plate 62.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
EP19872842.0A 2018-10-17 2019-10-17 Asphaltfertiger Pending EP3868956A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018195806 2018-10-17
PCT/JP2019/040987 WO2020080497A1 (ja) 2018-10-17 2019-10-17 アスファルトフィニッシャ

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EP3868956A1 true EP3868956A1 (de) 2021-08-25
EP3868956A4 EP3868956A4 (de) 2021-12-29

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JP2656210B2 (ja) * 1993-10-08 1997-09-24 新キャタピラー三菱株式会社 舗装機械等のスクリード装置
JP3328584B2 (ja) * 1998-06-04 2002-09-24 住友建機製造株式会社 アスファルトフィニッシャ等の道路舗設車両のスクリード装置
JP3383908B2 (ja) * 1999-06-15 2003-03-10 住友建機製造株式会社 アスファルトフィニッシャ等の道路舗設車両のスクリード装置
JP3939282B2 (ja) 2003-10-14 2007-07-04 住友建機製造株式会社 アスファルトフィニッシャーの伸縮スクリュー装置及びスクリード装置
JP2008169562A (ja) * 2007-01-09 2008-07-24 Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd 道路舗装車両のスクリード装置
JP4813410B2 (ja) 2007-03-28 2011-11-09 住友建機株式会社 道路舗装機械におけるスクリード部合材侵入防止用仕切装置の加熱構造
JP2008255642A (ja) * 2007-04-04 2008-10-23 Caterpillar Japan Ltd 舗装用建設機械のスクリード装置
JP5080358B2 (ja) * 2008-05-27 2012-11-21 範多機械株式会社 アスファルトフィニッシャにおけるスクリード装置
JP6029941B2 (ja) * 2012-11-08 2016-11-24 住友重機械工業株式会社 舗装機械用画像生成装置
JP2017089325A (ja) * 2015-11-16 2017-05-25 住友建機株式会社 アスファルトフィニッシャ
US10468148B2 (en) 2017-04-24 2019-11-05 Infineon Technologies Ag Apparatus and method for neutron transmutation doping of semiconductor wafers

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JPWO2020080497A1 (ja) 2021-12-02
CN112888822B (zh) 2023-07-14
WO2020080497A1 (ja) 2020-04-23
CN112888822A (zh) 2021-06-01
JP7247212B2 (ja) 2023-03-28
EP3868956A4 (de) 2021-12-29

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