WO2017064966A1 - Dispositif de détection de prévention de délogement pour flèche extensible et rétractable de grue mobile, et grue mobile - Google Patents

Dispositif de détection de prévention de délogement pour flèche extensible et rétractable de grue mobile, et grue mobile Download PDF

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Publication number
WO2017064966A1
WO2017064966A1 PCT/JP2016/076887 JP2016076887W WO2017064966A1 WO 2017064966 A1 WO2017064966 A1 WO 2017064966A1 JP 2016076887 W JP2016076887 W JP 2016076887W WO 2017064966 A1 WO2017064966 A1 WO 2017064966A1
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WO
WIPO (PCT)
Prior art keywords
detector
cylindrical member
telescopic
cylindrical
telescopic beam
Prior art date
Application number
PCT/JP2016/076887
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English (en)
Japanese (ja)
Inventor
朝彦 村田
Original Assignee
コベルコ建機株式会社
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Filing date
Publication date
Priority claimed from JP2016091569A external-priority patent/JP6288154B2/ja
Application filed by コベルコ建機株式会社 filed Critical コベルコ建機株式会社
Publication of WO2017064966A1 publication Critical patent/WO2017064966A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/72—Counterweights or supports for balancing lifting couples
    • B66C23/74—Counterweights or supports for balancing lifting couples separate from jib
    • B66C23/76—Counterweights or supports for balancing lifting couples separate from jib and movable to take account of variations of load or of variations of length of jib

Definitions

  • the present disclosure relates to a detection device for preventing a telescopic beam from coming out of a mobile crane and the mobile crane.
  • a counterweight carriage is arranged behind the crane body, and the counterweight carriage and the crane body are connected by an extendable beam. May be linked.
  • the telescopic beam is usually formed by nesting two cylindrical members (an inner beam and an outer beam).
  • a counterweight cart is a self-propelled type. Provide a retaining mechanism so that one cylindrical member of the telescopic beam does not come out of the other cylindrical member when extending, or one side of the cylindrical member of the telescopic beam comes out from the other cylindrical member It is necessary to stop the movement of the counterweight carriage at the position.
  • the retaining mechanism needs to be large and sturdy in order to stop the movement of the counterweight carriage against the inertial force due to the mass and movement speed of the counterweight carriage. Has the disadvantage of becoming higher.
  • the gap between the inner beam and the outer beam may not be constant due to tolerances at the time of manufacturing the telescopic beam and wear of the pad due to aging. For this reason, if the detector is simply fixed to the outer beam, the detector may approach or move away from the inner beam due to a change in the gap, and there is a possibility that the detected part attached to the inner beam does not contact as designed. Further, there is a possibility that the detector directly hits the inner beam instead of the detected portion.
  • the present disclosure has been made in view of the above points, and even if the gap between the tubular members of the telescopic beam changes due to manufacturing tolerances or wear of pads due to aging, etc., the telescopic beam tube It is possible to reliably detect that one cylindrical member is in a position on the near side between the cylindrical members and the other cylindrical member comes out of the other cylindrical member, and the detector contacts the cylindrical member of the telescopic beam to be detected. Alternatively, it is possible to prevent collision of the detector and prevent the breakage of the detector, and a mobile device capable of preventing the extension beam from falling out and the detector can be prevented from being damaged and the extension beam can be prevented from coming out or falling off. The purpose is to provide a crane.
  • a detection device for preventing extension of a telescopic beam from a mobile crane wherein a crane body and a self-propelled counterweight carriage are connected by an extendable beam, and the telescopic beam includes a plurality of tubular members nested.
  • the telescopic beam of the mobile crane arranged in the shape is the detection target.
  • the detection device for preventing the extension beam from coming out of the mobile crane according to this aspect includes a detector and a fluctuation mechanism.
  • the detector In the cross-sectional direction of the telescopic beam, the detector is between the first and second cylindrical members adjacent to each other inside and outside, and in the telescopic direction of the telescopic beam, the first cylindrical member is At least a portion is installed at a position on the near side that comes out of the second tubular member.
  • the variation mechanism is configured such that the position of the detector with respect to the first and second cylindrical members in the cross-sectional direction of the telescopic beam is a gap between the first and second cylindrical members in the cross-sectional direction of the telescopic beam. Change to follow the change of.
  • FIG. 1 is a schematic side view illustrating an overall configuration of a crawler crane 1 according to a first embodiment of the present disclosure. It is a schematic side view which shows the state which extended the telescopic beam 50 of the crawler crane 1.
  • FIG. It is a model side view which shows the structure of the expansion-contraction beam 50 in the most contracted state. It is a model side view which shows the structure of the expansion-contraction beam 50 in the most extended state.
  • FIG. 4 is a schematic enlarged view showing a partial configuration of a telescopic beam 50 (V portion in FIG. 3).
  • FIG. 6 is a schematic cross-sectional view showing a partial configuration of a telescopic beam 50 (a VI-VI cross-sectional portion in FIG. 5).
  • FIG. 6 is a schematic cross-sectional view showing the configuration of the extension beam drop-out prevention detecting device 70 in the section VII-VII in FIG. 5.
  • FIG. 5 is a schematic cross-sectional view showing a state in which a detector 73 detects a striker 75 (detected part) in the detection device 70 for preventing the extension beam from coming out.
  • FIG. 8 is a schematic cross-sectional view showing the configuration of the extension beam drop-out prevention detecting device 70 in the section IX-IX in FIG. 7.
  • 3 is a schematic front view showing a configuration of a detector 73.
  • FIG. 4 is a schematic side view showing the configuration of a detector 73.
  • FIG. 14 is a schematic cross-sectional view showing the configuration of the expansion / contraction beam drop-out prevention detecting device 100 along the XIV-XIV cross section of FIG. 13.
  • FIG. 3 is a schematic cross-sectional view showing a partial configuration of a detection device 100 for preventing expansion / contraction beam withdrawal.
  • FIG. 3 is a schematic cross-sectional view showing a partial configuration of a detection device 100 for preventing expansion / contraction beam withdrawal. It is a schematic diagram which shows the attachment method of the attachment plate 101 to the telescopic beam 50 in the XVII-XVII cross section of FIG. It is a model side view which shows each partial structure of the expansion-contraction beam 50 and the expansion-contraction beam drop-out prevention detection apparatus 120 in the crawler crane which concerns on 3rd Embodiment.
  • FIG. 19 is a schematic cross-sectional view showing the configuration of the expansion / contraction beam drop-out prevention detecting device 120 in the XIX-XIX cross section of FIG. FIG.
  • FIG. 20 is a schematic cross-sectional view showing the configuration of the expansion / contraction beam drop-out prevention detection device 120 in the section XX-XX in FIG. 19. It is a model side view which shows the structure of the detection apparatus 120 for a telescopic beam drop-out prevention which concerns on 3rd Embodiment.
  • FIG. 3 is a schematic plan view showing the configuration of a telescopic beam dropout prevention detecting device 120.
  • FIG. 23 is a schematic cross-sectional view showing a configuration of a telescopic beam drop-out prevention detecting device 120 in a section XXIII-XXIII in FIG.
  • the crawler crane 1 includes a crane body 10, a self-propelled counterweight carriage 40, and an extendable beam 50 that connects them.
  • the crane body 10 includes a lower traveling body 12, an upper swing body 12, a cab 15, a boom 16, a mast 17, a gantry 18, and a counterweight 19.
  • the lower traveling body 12 travels by the crawler 11.
  • the upper turning body 14 is installed on the lower traveling body 12 with a turning device 13 interposed, and can turn.
  • the cab 15 is provided at the front part of the upper swing body 14.
  • the boom 16 is supported at the front of the upper swing body 14 and on the side of the cab 15.
  • the boom 16 is supported in a state where the base end thereof can be raised and lowered, in other words, can be rotated around a horizontal axis.
  • the mast 17 is supported near the rear end of the base end (boom foot) of the boom 16 at the front portion of the upper swing body 14.
  • the mast 17 is supported in a state where the proximal end can be raised and lowered.
  • the gantry 18 and the counterweight 19 are provided at the rear part of the upper swing body 14.
  • the suspension hook 22 is suspended from the tip of the boom 16 via a hoisting rope 21.
  • One end of the hoisting rope 21 is wound around a winding drum 23 provided on the upper swing body 14 through the back side of the boom 16. Then, the hoisting rope 22 is wound or unwound by winding or unwinding the hoisting rope 21 by the winding drum 23.
  • One end of a guy line 24 is connected to the tip of the boom 16, and a spreader 25 is provided at the other end of the guy line 24.
  • a boom hoisting rope 27 is wound around the spreader 25 and the spreader 26 provided at the tip of the mast 17.
  • One end of the boom hoisting rope 27 is wound around a boom hoisting drum 28 provided at the base end of the mast 17 from the spreader 26 through the back side of the mast 17.
  • the boom 16 performs a hoisting operation by winding or unwinding the boom hoisting rope 27 by the boom hoisting drum 28.
  • the top of the gantry 18 is connected to the tip of the mast 17 via a guy line 31 and a mast hoisting rope 32.
  • the mast hoisting rope 32 is wound around a mast hoisting drum 29 provided at the base end of the gantry 18.
  • the counterweight carriage 40 is supported from the tip of the mast 17 via the hanger line 33.
  • the guy lines 24 and 31 and the hanger line 33 are not limited to a rope such as a wire rope, and may be formed by connecting a plurality of link members.
  • the counterweight carriage 40 has a plurality of wheels 41. In FIG. 1 and FIG. 2, only one wheel is illustrated for convenience of illustration.
  • the plurality of wheels 41 are rotationally driven by a hydraulic drive motor 42 (see FIG. 12), and are provided so as to be able to turn around a vertical axis. And when the crane main body 10 moves back and forth, the counterweight carriage 40 runs back and forth in accordance with the movement.
  • the counterweight carriage 40 floats from the ground when a suspended load of a predetermined mass or more is lifted by the crane body 10, and the mass at this time is determined according to the length of the telescopic beam 50.
  • the counterweight carriage 40 When the telescopic beam 50 is expanded and contracted, the counterweight carriage 40 travels with the rotation axis of the wheel 41 (that is, the axle) oriented in a direction perpendicular to the longitudinal direction of the telescopic beam 50. Specifically, when the telescopic beam 50 is to be reduced, the counterweight carriage 40 is caused to travel in a direction relatively approaching the crane body 10. Thereby, as shown in FIG. 1, the telescopic beam 50 is contracted, and the counterweight carriage 40 approaches the crane body 10.
  • a mode in which a relative distance between the crane body 10 and the counterweight carriage 40 is set by running the crane body 10 can also be adopted. Even when such a configuration is adopted, the telescopic beam 50 can be expanded and contracted, and the state shown in FIG. 1 and the state shown in FIG. 2 or a state therebetween can be realized.
  • the telescopic beam 50 has two cylindrical members 51 and 52.
  • the telescopic beam 50 is formed by nesting these two cylindrical members 51 and 52.
  • the cylindrical members 51 and 52 are both cylindrical members having a quadrangular cross section.
  • the inner cylindrical member 51 is referred to as an “inner beam”
  • the outer cylindrical member 52 is referred to as an “outer beam”.
  • one end (front end) of the inner beam 51 is coupled to the rear end portion of the upper swing body 14 of the crane body 10 by a coupling pin or the like, and one end portion (rear end portion) of the outer beam 52. ) Is fixed in a state of penetrating the counterweight carriage 40.
  • the other end side (rear end side) of the inner beam 51 is inserted into the inner beam 51 from the other end (front end) of the outer beam 52.
  • the length of the telescopic beam 50 is determined in inverse proportion to the insertion length.
  • one end of the outer beam 52 may be fixed to the end of the counterweight carriage 40 on the crane body 10 side.
  • a plurality of pin insertion holes 53, 53,... are provided at predetermined intervals along the longitudinal direction of the left and right side walls of the inner beam 51, respectively.
  • pin insertion devices 55 are provided on the left and right side wall portions on the front end side of the outer beam 52. As shown in FIG. 6, the pin insertion device 55 can insert a pin 54 into one pin insertion hole 53 of the plurality of pin insertion holes 53, 53,... In the inner beam 51. Yes. Thereby, the length of the telescopic beam 50 is determined.
  • the pin insertion device 55 has a hydraulic cylinder 57.
  • a pin 54 is joined to the rod of the hydraulic cylinder 57.
  • the pin 54 can reciprocate between the insertion position inserted into the pin insertion hole 53 and the retraction position withdrawn and retracted from the pin insertion hole 53 by driving of the hydraulic cylinder 57.
  • the hydraulic cylinder 57 is fixed to the side wall of the outer beam 52 using a bracket or the like.
  • the actuator of the pin insertion device 55 is not limited to the hydraulic cylinder 57 but may be a pneumatic cylinder or an electric cylinder, or may be driven linearly by a combination of a motor and a rack and pinion.
  • a predetermined gap is provided between the inner beam 51 and the outer beam 52.
  • the inner beam 51 and the outer beam 52 can be smoothly expanded and contracted relatively smoothly by a gap provided therebetween.
  • each pad is made of a synthetic resin such as a nylon resin having self-lubricating properties.
  • a hydraulic cylinder 66 is disposed along the central axis of the inner beam 51 as shown in FIG.
  • the telescopic beam 50 is expanded and contracted, if the expansion and contraction of the telescopic beam 50 by the power of the counterweight carriage 40 and the expansion and contraction of the hydraulic cylinder 66 are synchronized, there is no problem in the expansion and contraction operation, and the counterweight carriage 40 is not moved. There is no problem even if the wheels 41 provided on the counterweight carriage 40 are allowed to freely rotate and the telescopic beam 50 is expanded and contracted only by the expansion and contraction of the hydraulic cylinder 66.
  • a rectangular frame-shaped end plate 67 is fixed to the front end of the outer beam 52 so as to surround the outer periphery thereof.
  • the crawler crane 1 is provided with a detection device 70 for preventing the extension beam from coming out, as shown in FIG.
  • the telescopic beam dropout prevention detecting device 70 includes a mounting plate 72, a detector 73, and a fluctuation mechanism 74.
  • the mounting plate 72 is attached to a rectangular opening 68 provided on the side wall portion on the front end side of the outer beam 52 through an opening frame 69.
  • the detector 73 is attached to a mounting plate 72.
  • the detector 73 is installed between the inner beam 51 and the outer beam 52 of the telescopic beam 50 at a position on the near side where the inner beam 51 comes out of the outer beam 52.
  • the position on the near side where the inner beam 51 comes out of the outer beam 52 between the inner beam 51 and the outer beam 52 of the telescopic beam 50 is the position on the front end side of the outer beam 52 or the inner beam 51 in this embodiment.
  • the variation mechanism 74 is inserted between the mounting plate 72 and the detector 73.
  • the changing mechanism 74 changes the position of the detector 73 following the change between the inner beam 51 and the outer beam 52.
  • the mounting plate 72 corresponds to “another member” fixed to the outer beam 52 which is the “first cylindrical member”.
  • the detector 73 is composed of a limit switch which is a contact type detector. That is, the detector 73 has a detector main body 73a, a swing lever 73c, and a rotating roller 73d.
  • the oscillating lever 73c is held by the detector main body 73a so that its proximal end can rotate around the support shaft 73b. Further, the swing lever 73c is held in the neutral position shown in FIG. 10 by a spring (not shown) when no force is applied from the outside.
  • Rotating roller 73d is provided at the tip of swing lever 73c.
  • the detector 73 causes the inner beam 51 to escape from the outer beam 52. Detect that it is in the near side position.
  • the striker 75 is provided on the outer surface of the side wall of the inner beam 51 as a “detected part”.
  • the fluctuation mechanism 74 includes a holding member 76, four traveling rollers 78, 78,..., And two compression coil springs 79, 79. 7 and 8, only two of the four traveling rollers 78, 78,... Are shown for convenience of illustration.
  • the holding member 76 is a member that holds the detector 73 and has a rectangular flat plate shape that is long in the longitudinal direction (front-rear direction) of the telescopic beam 50.
  • the four traveling rollers 78, 78,... are provided on the left and right, respectively, with the front and rear portions of the holding member 76 being rotatably supported via the axles 77.
  • the two compression coil springs 79, 79 are provided as “elastic bodies” between the holding member 76 and the mounting plate 72 respectively in the front and rear.
  • the detector 73 is disposed at an intermediate position between the front and rear traveling rollers 78, 78 on the holding member 76.
  • the detector 73 is in a state where the rotating roller 73d is directed to the inner beam 51.
  • the detector 73 is held by the holding member 76 by screwing the detector main body 73 a to the holding member 76.
  • Each traveling roller 78 is provided as a “contact member” or “roller”, and is in contact with the inner beam 51 so as to be able to roll. Further, each traveling roller 78 is set to have a predetermined interval between the outer wall surface of the inner beam 51 and the rotating roller 73d of the detector 73.
  • the detector 73 is positioned between the two left and right traveling rollers 78 and 78, and the rotating roller 73 d is provided on the outer surface of the side wall of the inner beam 51 between the two left and right traveling rollers 78 and 78. It comes in contact with the striker 75.
  • each compression coil spring 79 urges each traveling roller 78 to always contact the outer surface of the side wall of the inner beam 51. As shown in FIG.
  • the fluctuation mechanism 74 has fastening bolts 80, 80 corresponding to the compression coil springs 79.79.
  • the fastening bolt 80.80 does not move too much in the axial direction or the rotating direction of the telescopic beam. It is used to make it. That is, the threaded portion of the fastening bolt 80 is inserted into a bolt insertion hole (baka hole, not shown) provided in the mounting plate 72, and the tip of the threaded portion is provided on the end surface of the holding member 76. Screwed into a tapped hole (not shown).
  • the compression coil spring 79 is installed in a compressed state by being restrained by the inner beam 51 and the mounting plate 72.
  • the changing mechanism 74 moves from a predetermined position in the axial direction or the rotating direction of the telescopic beam 50, the position does not change more than necessary due to the presence of the fastening bolt 80.
  • the screw portion of the fastening bolt 80 is screwed into a screw hole (not shown) provided in the mounting plate 72.
  • a screw hole (not shown) provided in the mounting plate 72.
  • the head of the fastening bolt 80 is in contact with the mounting plate 72, and the tip of the threaded portion of the fastening bolt 80 is not in contact with the holding member 76. It is also possible to do.
  • the compression coil spring 79 is compressed by being constrained by the inner beam 51 and the mounting plate 72 by installing the fluctuation mechanism 74 at a predetermined position.
  • the changing mechanism 74 moves from a predetermined position in the axial direction or the rotating direction of the telescopic beam 50, the presence of the fastening bolt 80 does not change the position more than necessary.
  • the clearance between the fastening bolt 80 and the holding member 76 is larger than the clearance between the inner beam 51 and the outer beam 52, and a clearance between a mounting hole 106 and a threaded portion of the bolt 108, which will be described later (see FIGS. 14 to 16). See).
  • the counterweight carriage 40 has a hydraulic drive motor 42, a switching valve 92, and a hydraulic pressure source 91.
  • the drive motor 42 drives the wheels 41 of the counterweight carriage 40 upon receiving hydraulic pressure.
  • the switching valve 92 is provided between the hydraulic pressure source 91 and the drive motor 42, and is a valve for controlling supply of hydraulic pressure to the drive motor 42 and stop thereof.
  • the detection signal is Are input to the controller 90.
  • the controller 90 issues a command to switch the switching valve 92 to the neutral position.
  • the switching valve 92 cuts off the hydraulic pressure supply to the drive motor. Thereby, the drive of the drive motor 42 is stopped and the movement of the counterweight carriage 40 is stopped.
  • the controller 90 when the controller 90 receives a detection signal from the detector 73, a command for setting the switching valve 92 to the neutral position is issued, and the drive of the drive motor 42 of the counterweight carriage 40 is stopped.
  • the following forms can also be adopted.
  • the crane body 10 includes a drive motor that drives the crawler 11 of the lower traveling body 12, a hydraulic source that supplies hydraulic pressure to the drive motor, and a switching valve that is provided between the drive motor and the hydraulic source. Assume form.
  • the controller 90 that has received the detection signal from the detector 73 instructs the switching valve of the crane body 10 to switch the switching valve to the neutral state.
  • the switching valve that receives the switching command cuts off the hydraulic pressure supply to the drive motor of the crane body 10. Thereby, the drive of the crane main body 10 is stopped.
  • the detector 73 causes the inner beam 51 of the telescopic beam 50 to come out of the outer beam 52.
  • the crane body 10 can be stopped when it is detected that the position is on the near side.
  • the telescopic beam dropout prevention detecting device 70 follows the change in the gap between the inner beam 51 and the outer beam 52 with the detector 73 configured as described above and the position of the detector 73 as described above. And a fluctuation mechanism 74 that fluctuates.
  • the position of the detector 73 follows the change. Is varied by the variation mechanism 74.
  • the changing mechanism 74 changes the position of the detector 73 in the cross-sectional direction of the inner beam 51 and the outer beam 52 in the telescopic beam 50.
  • the rotating roller 73d of the detector 73 and the inner beam 51 opposed thereto are opposed to each other with a predetermined gap. For this reason, it is possible to reliably perform detection by contact between the rotating roller 73d of the detector 73 and the striker 75, and to prevent the rotating roller 73d of the detector 73 from directly hitting the inner beam 51 and being damaged. can do.
  • the crawler crane 1 is provided with the detection device 70 for preventing the extension beam from coming out, and the detector 73 of the detection device 70 detects that the inner beam 51 of the extension beam 50 is in a position on the near side where the inner beam 51 comes out from the outer beam 52.
  • the controller 90 is configured to stop the counterweight carriage 40 or the crane body 10. For this reason, it is possible to prevent the inner beam 51 of the telescopic beam 50 from coming out or falling off.
  • the detector 73 may be a contact type or a non-contact type.
  • the detector 73 is a limit switch that is a contact type detector installed on the outer beam 52 of the telescopic beam 50.
  • the detector 73 composed of a limit switch is more suitable for outdoor use exposed to dust, wind and rain, temperature changes, etc., like the crawler crane 1, as compared with the case where the detector is a non-contact type. Can improve the reliability.
  • the use of the contact type detector 73 is more preferable as the detector 73 is closer to the outside as at the end of the telescopic beam 50, that is, at a position where it is more likely to be affected by dust or the like.
  • the detector 73 is installed on the outer beam 52 of the telescopic beam 50, so that the installation of the detector 73 and the wiring work of signal lines connected to the detector 73 are relatively easy. It can be carried out.
  • the fluctuation mechanism 74 includes a holding member 76, four traveling rollers 78, 78,..., And two compression coil springs 79, 79.
  • the holding member 76 is a member that holds the detector 73 as described above.
  • the four traveling rollers 78, 78,... Are members as contact members or rolling elements attached to the holding member 76.
  • the two compression coil springs 79 and 79 are members as elastic bodies interposed between the holding member 76 and the mounting plate 72 fixed to the outer beam 52.
  • Each traveling roller 78 comes in contact with the inner beam 51 so that the rotating roller 73d of the detector 73 faces the inner beam 51 with a predetermined gap therebetween.
  • Each compression coil spring 79 urges each traveling roller 78 to always contact the inner beam 51.
  • each traveling roller 78 attached to the holding member 76 receives the urging force of each compression coil spring 79 interposed between the holding member 76 and the attachment plate 72 and always contacts the inner beam 51. It has become a state.
  • the rotating roller 73d of the detector 73 held by the holding member 76 is surely opposed to the inner beam 51 by a predetermined gap by each traveling roller 78. For this reason, the reliability of operation
  • each traveling roller 78 as a contact member or a rolling element comes into contact with the inner beam 51 so as to be able to roll, wear of each traveling roller 78 due to this contact can be reduced. it can.
  • the attachment position of the variation mechanism 74 is installed at a position away from the end plate 67, but it may be installed at a position close to the end plate 67, and the attachment plate 72 may be attached to the end plate 67.
  • the opening frame 69 may be attached.
  • the telescopic beam 50 can be extended as long as possible. Also, the extension amount of the telescopic beam 50 can be changed by changing the position of the striker 75.
  • FIGS. 13 to 17 show a configuration of the detection device 100 for preventing extension / retraction beam withdrawal of the crawler crane according to the present embodiment.
  • the configuration of the telescopic beam 50 is substantially the same as that of the first embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.
  • the telescopic beam dropout prevention detecting device 100 includes a mounting plate 101, two detectors 102, 102, a variation mechanism 103, and the like. It has.
  • the mounting plate 101 is attached to an end plate 67 provided at the front end of the outer beam 52 of the telescopic beam 50.
  • the two detectors 102 and 102 are attached to the attachment plate 101.
  • Each detector 102 is positioned between the inner beam 51 and the outer beam 52 of the telescopic beam 50 on the near side where the inner beam 51 comes out of the outer beam 52 (specifically, the position of the end plate 67 on the front end side of the outer beam 52). Is installed.
  • the variation mechanism 103 uses the mounting plate 101 as one constituent member.
  • the changing mechanism 103 changes the position of each detector 102 following the change in the gap between the inner beam 51 and the outer beam 52.
  • the mounting plate 101 constitutes one constituent member of the fluctuation mechanism 103 as a holding member that holds each detector 102.
  • the mounting plate 101 has an upper side part 101a, two side parts 101b and 101b, and flange parts 101c and 101c.
  • the upper side portion 101 a faces the upper frame portion 67 a of the end plate 67.
  • the two side portions 101b and 101b are respectively suspended from the left and right ends of the upper side portion 101a and are opposed to the upper portions of the side frame portions 67b of the end plate 67, respectively.
  • the flange portions 101c and 101c are formed by bending the lower end portions of both side portions 101b and 101b at substantially right angles.
  • each tapped block 104 has a screw hole 105 on its center line.
  • the upper side portion 101 a of the mounting plate 101 is provided with two left and right mounting holes 106, 106 corresponding to the tapped block 104.
  • the inner diameter of each mounting hole 106 is set to a so-called fool hole that is larger than the outer diameter of the tapped block 104.
  • each tapped block 104 in the center line direction is set to be slightly larger than the thickness dimension of the upper side portion 101a of the mounting plate 101.
  • the mounting plate 101 When mounting the mounting plate 101, first, the mounting plate 101 is brought into contact with or close to the end plate 67 with the tapped block 104 inserted into each mounting hole 106. Next, in this state, a washer 107 larger than the attachment hole 106 is brought into contact with the tip of the tapped block 104. Thereafter, the screw portion of the bolt 108 is screwed into the screw hole 105 of the tapped block 104 through the center hole 109 of the washer 107.
  • the attachment plate 101 is attached to the end plate 67 in a state of being movable along the end plate 67 which is a plane orthogonal to the axial direction thereof.
  • the attachment plate 101 is attached to the outer beam 52 via the end plate 67.
  • this movement is limited to a range where the mounting plate 101 does not directly contact the inner beam 51.
  • a washer similar to the washer 107 is disposed between the mounting plate 101 and the upper frame portion 67 a of the end plate 67. Further, a through hole is provided in the upper frame portion 67 a of the end plate 67. Next, the threaded portion of the bolt 108 is passed through the central hole 109 of the washer 107, the mounting hole 106 of the mounting plate 101, the central hole of the washer, and the through hole of the upper frame portion 67a of the end plate 67. And you may make it fix the thread part of the volt
  • each detector 102 includes a limit switch that is a contact type detector, like the detector 73 in the first embodiment.
  • Each detector 102 has a detector main body 102a, a swing lever 102c, and a rotating roller 102d.
  • the detector body 102 a is fixed to the upper surface of the flange portion 101 c of the mounting plate 101 with the swing lever 102 c and the rotating roller 102 d facing the outer surface of the side wall portion of the inner beam 51.
  • Each detector 102 is in a position on the near side where the inner beam 51 comes out of the outer beam 52 when the rotating roller 102d comes into contact with the striker 110 as a detected portion provided on the outer surface of the side wall portion of the inner beam 51. Detect something.
  • the variation mechanism 103 includes pads 111, 111 in addition to the mounting plate 101 as a holding member that holds each detector 102.
  • the pads 111 and 111 are provided as two left and right contacts respectively attached to the inner edges of the side portions 101b of the mounting plate 101.
  • Each pad 111 is made of a synthetic resin such as a nylon resin having self-lubricating properties.
  • Each pad 111 is always in contact with a corresponding side surface portion of the inner beam 51, so that the rotating roller 102 d of the detector 102 corresponding to each pad 111 is separated from the inner beam 51 by a predetermined gap. And come to face each other.
  • the detection device 100 for the extension / removal beam prevention also includes the two detectors 102 and 102 configured as described above, and the positions of the detectors 102 and the inner beam 51. And a fluctuation mechanism 103 that fluctuates following the change in the gap between the outer beams 52. For this reason, the same effect as the case of a 1st embodiment can be produced.
  • the mounting plate 101 as a holding member that holds the detector 102 is movable along the end plate 67 that is a plane perpendicular to the axial direction of the outer beam 52. It is attached.
  • the left and right pads 111, 111 attached to the inner edges of the side portions 101b of the attachment plate 101 are always in contact with the inner beam 51, respectively.
  • Each pad 111, 111 is provided as a slider.
  • the mounting plate 101 is made of a relatively thin and light member, there is almost no resistance force due to contact with the inner beam 51, and the frictional force that causes wear of the pad 111 is also very small. . For this reason, the wear of the pad 111 hardly occurs, and the gap between the side portion 101b of the mounting plate 101 and the inner beam 51 can be kept constant over a long period of time.
  • the pad 111 since the pad 111 needs to be in constant contact with the inner beam 51, the pad 111 is pressed against the inner beam 51 from the side portion 101 b of the mounting plate 101 with a bolt or a spring. It is preferable to provide a mechanism or a mechanism for adjusting the pressing state.
  • the gap between the mounting hole 106 of the mounting plate 101 and the threaded portion of the bolt 108 is the same as or larger than the gap between the inner beam 51 and the outer beam 52. This is because the mounting plate 101 moves when the mounting plate 101 is in contact with the pad 111 in accordance with the change in the gap between the inner beam 51 and the outer beam 52. Therefore, the mounting hole 106 of the mounting plate 101 and the threaded portion of the bolt 108 are moved. If the clearance between the inner beam 51 and the outer beam 52 varies, the mounting hole 106 and the threaded portion of the bolt 108 come into contact with each other first, thereby making it impossible to follow.
  • the gap between the screw portion of the bolt 106 and the bolt 108 is made larger by the amount of wear.
  • FIGS. 18 to 23 show a configuration of the detecting device 120 for preventing the extension beam from coming out of the crawler crane according to the present embodiment.
  • the configuration of the telescopic beam 50 is substantially the same as in the first embodiment, and the same members are denoted by the same reference numerals, and the description thereof will be omitted.
  • the telescopic beam dropout prevention detecting device 120 is attached to an end plate 67 provided at the front end of the outer beam 52 of the telescopic beam 50.
  • the telescopic beam drop-out prevention detecting device 120 is attached to the upper portion of one side frame portion 67b of the end plate 67, but may be attached to another portion of the end plate 67. .
  • the detection device 120 for preventing expansion / contraction beam dropout includes a case body 121, a detector 122, and a fluctuation mechanism 123.
  • the case body 121 is attached to the front side of the end plate 67.
  • the detector 122 is partially housed inside the case body 121. As shown in FIGS. 18 and 20, the detector 122 is installed between the inner beam 51 and the outer beam 52 of the telescopic beam 50 at a position on the near side where the inner beam 51 comes out of the outer beam 52. More specifically, the detector 122 is installed at the position of the end plate 67 on the front end side of the outer beam 52.
  • the variation mechanism 123 is provided so as to be interposed between the case main body 121 and the detector 122.
  • the changing mechanism 123 changes the position of the detector 122 following the change in the gap between the inner beam 51 and the outer beam 52.
  • the case body 121 includes a main side plate 124, a sub side plate 125, and an intermediate plate 126 disposed between the both side plates 124 and 125.
  • the intermediate plate 126 is fixed to the main side plate 124 and the sub side plate 125 by fillet welding or the like.
  • the main side plate 124 is formed in a substantially isosceles trapezoidal shape in which the vertical dimension gradually increases toward the end plate 67 side.
  • the main side plate 124 is provided with a pair of insertion holes 127 and 127 at two positions on the upper and lower sides of the end portion on the end plate 67 side.
  • the case main body 121 is fixed to the end plate 67 by fixing tools 128 (see FIGS. 18 and 19) such as bolts and screws inserted into the respective insertion holes 127.
  • the sub-side plate 125 is formed in a rectangular shape.
  • the vertical dimension (length in the short direction) of the auxiliary side plate 125 is substantially the same as the vertical dimension of the main side plate 124 on the side opposite to the end plate.
  • the length of the sub-side plate 125 in the longitudinal direction is substantially the same as that of the main side plate 124.
  • the intermediate plate 126 has an upper wall portion 126a, a lower wall portion 126b, and a back wall portion 126c.
  • the rear wall 126c extends in the vertical direction along the opposite end plate side ends of the main side plate 124 and the sub side plate 125.
  • the upper wall portion 126a extends in the horizontal direction from the upper end of the back wall portion 126c along the upper edge of the sub-side plate 125 to the middle position in the longitudinal direction of the sub-side plate 125.
  • the lower wall portion 126b extends in the horizontal direction from the lower end of the back wall portion 126c along the lower edge of the sub-side plate 125 to the middle position in the longitudinal direction of the sub-side plate 125.
  • the horizontal length of the lower wall portion 126b is longer than that of the upper wall portion 126a.
  • the case body 121 has the accommodating part 129 open
  • the detector 122 includes a limit switch that is a contact type detector, like the detector 73 in the first embodiment.
  • the detector 122 includes a detector main body 122a, a swing lever 122c, and a rotating roller 122d.
  • the detector main body 122a of the detector 122 is fixed to a holding member 131 (to be described later) with the swing lever 122c and the rotating roller 122d facing the outer surface of the side wall of the inner beam 51.
  • the rotating roller 122d comes into contact with a striker as a detected portion provided on the outer surface of the side wall of the inner beam 51, and the swing lever 122c tilts as indicated by a virtual line in FIG. It is detected that the beam 51 is in a position on the near side where it comes out of the outer beam 52.
  • the fluctuation mechanism 123 has a holding member 131 that holds the detector 122.
  • the holding member 131 is a plate-like member that is formed in a substantially U shape as a whole, and is a connecting portion that connects a pair of upper and lower leg portions 131a and 131a and base ends of the pair of upper and lower leg portions 131a and 131a. 131b.
  • the base end side of the connecting portion 131b and each leg portion 131a of the holding member 131 is fitted in the housing portion 129 of the case body 121 so as to be slidable in the horizontal direction.
  • the base end side of the connecting portion 131b and each leg portion 131a of the holding member 131 is slidable in a direction perpendicular to the side wall portion of the inner beam 51 with respect to the storage portion 129 of the case body 121. It is mated.
  • the upper leg portion 131a of the holding member 131 is slidably in contact with the lower surface of the upper wall portion 126a of the intermediate plate 126 of the case body 121. Further, the lower leg portion 131 a of the holding member 131 is slidably in contact with the upper surface of the lower wall portion 126 b of the intermediate plate 126 of the case body 121.
  • the detector main body 122a of the detector 122 is fixed to the inner surface side (upper surface side) of the lower leg 131a of the holding member 131 by fastening bolts or the like.
  • the swing lever 122c and the rotating roller 122d are in a state facing the outer surface of the side wall portion of the inner beam 51 between the pair of upper and lower leg portions 131a and 131a.
  • the variation mechanism 123 is disposed outside the holding member 131.
  • the fluctuation mechanism 123 has two upper and lower traveling rollers 133 and 133 and one compression coil spring 134.
  • the pair of upper and lower traveling rollers 133 and 133 are rotatably supported at the tip end portions of the leg portions 131 a of the holding member 131 via the support shafts 132.
  • Each traveling roller 133 is a contact member or a rotator, and is in contact with the inner beam 51 so that the rotation roller 73d of the detector 73 faces the inner beam 51 with a predetermined gap therebetween.
  • the compression coil spring 134 is an elastic body and is interposed between the connecting portion 131 b of the holding member 131 and the back wall portion 126 c of the intermediate plate 126 of the case body 121.
  • the compression coil spring 134 urges each traveling roller 133 to always contact the inner beam 51 in a compressed state described later.
  • case body 121 corresponds to “another member” fixed to the outer beam 52 which is one cylindrical member.
  • the variation mechanism 123 causes the holding member 131 to intervene when the compression coil spring 134 is interposed between the connecting portion 131 b of the holding member 131 and the inner wall 126 c of the intermediate plate 126 of the case body 121.
  • the screw rod 135 and the nut 136 are used for restricting the case body 121 from coming out of the housing portion 129 of the case body 121.
  • the screw rod 135 is inserted into an insertion hole (fool hole, not shown) provided in the inner wall 126c of the intermediate plate 126 of the case body 121.
  • One end of the screw rod 135 is fixed by welding while being screwed into a screw hole (not shown) provided in the connecting portion 131b of the holding member 131.
  • the nut 136 screwed into the other end portion of the screw rod 135 is in the back wall portion 126 c of the intermediate plate 126 of the case body 121 in the use state of the detection device 120 for preventing the extension beam from coming out. It will be in a state away from. In this state, the compression coil spring 134 is compressed between the connecting portion 131b of the holding member 131 and the inner wall 126c of the intermediate plate 126 of the case body 121, and generates an urging force (reaction force) in this compressed state. It is like that.
  • a signal line 141 is connected to the detector 122. As shown in FIG. 23, the signal line 141 is led out of the case body 121 through a lead-out port 142 provided in the main side plate 124 of the case body 121.
  • the detection device 120 for preventing the extension beam from coming out is a detection device installed at a position between the inner beam 51 and the outer beam 52 of the extension beam 50 at a position on the near side where the inner beam 51 comes out of the outer beam 52. Since the detector 122 and the changing mechanism 123 that changes the position of the detector 122 following the change in the gap between the inner beam 51 and the outer beam 52 are provided, the same action as in the first embodiment is provided. There is an effect.
  • the fluctuation mechanism 123 of this embodiment includes a holding member 131 that holds the detector 122, two traveling rollers 133 and 133 as contact members or rolling elements attached to the holding member 131, and a holding member 131. And a compression coil spring 134 as an elastic body interposed between the outer casing 52 and a case body 121 fixed to the outer beam 52 (specifically, an end plate 67 provided at the front end of the outer beam 52).
  • Each traveling roller 133 comes into contact with the inner beam 51 so that the rotating roller 122d of the detector 122 faces the inner beam 51 with a predetermined gap therebetween, and the compression coil spring 134 is connected to each traveling roller. 133 is urged to always contact the inner beam 51.
  • each traveling roller 133 attached to the holding member 131 receives the urging force of the compression coil spring 134 interposed between the holding member 131 and the case body 121 and receives the inner beam 51. Always in contact. Then, the rotating roller 122d of the detector 122 held by the holding member 131 is reliably opposed to the inner beam 51 with a predetermined gap by each traveling roller 133. For this reason, the reliability of operation
  • the detection device 120 for preventing the extension beam from coming out can be easily attached to the end plate 67 provided at the front end of the outer beam 52. It can be extended as long as possible.
  • this indication is not limited to the said 1st thru
  • a contact-type detector 73 is attached to the front end side of the outer beam 52 of the telescopic beam 50, while a striker 75 as a detected portion is provided on the rear end side of the inner beam 51 of the telescopic beam 50. It was.
  • a contact-type detector may be attached to the rear end side of the inner beam 51, while a detected portion may be provided on the front end side of the outer beam 52.
  • the traveling roller 78 is used as an example of the contact member in the variation mechanism 74, but the present disclosure is not limited thereto.
  • a slide member may be used in place of the traveling roller 78 or in combination with the traveling roller 78.
  • the detector 73 is slidably or slidably contacted with the inner beam 51 so as to face the inner beam 51 at a predetermined interval, and the contact adversely affects the expansion and contraction of the telescopic beam 50. You don't have to.
  • the fluctuation mechanism 74 includes four traveling rollers 78, 78,... On the front and rear, left and right of the holding member 76, and two compression coil springs 79 and 79 on the front and rear of the holding member 76.
  • the detector 73 is held at an intermediate position between the front and rear traveling rollers 78 and 78 of the holding member 76. This is to prevent the detector 73 from contacting and reacting with the inner beam 51 by tilting the holding member 76 or the like.
  • the present disclosure is not limited to this.
  • the traveling roller and the compression coil spring can be made one each by preventing the holding member from being tilted.
  • the compression coil spring 79 is employed as an example of the elastic body, but the present disclosure is not limited thereto.
  • a spring other than the compression coil spring for example, a leaf spring, a torsion bar, a disc spring, a spiral spring, a bamboo spring, a ring spring, etc.
  • rubber, or the like may be used as the elastic body.
  • the mounting plate 101 when the mounting plate 101 is movably mounted along the end plate 67 provided at the front end of the outer beam 52 of the telescopic beam 50, the mounting plate 101 is mounted for each of the two left and right mounting holes 106.
  • a washer 107 larger than the hole 106 was used, the present disclosure is not limited to this configuration.
  • a plate that covers the two left and right mounting holes 106, 106 of the mounting plate 101 may be used.
  • the elastic body is not disposed between the mounting hole 106 of the mounting plate 101 and the tapped block 104.
  • the present disclosure is not limited to this configuration.
  • the tapped block 104 fixed to the end plate 67 is inserted into the mounting hole 106 of the mounting plate 101, and the threaded portion of the bolt 108 is inserted into the screw hole 105 of the tapped block 104 through the center hole 109 of the washer 107.
  • an elastic body may be disposed between the mounting hole 106 of the mounting plate 101 and the tapped block 104.
  • the mounting plate 101 can easily return to the neutral position, and high workability during assembly can be ensured. Become superior. That is, by making the attachment plate 101 easily return to the neutral position by the arrangement of the elastic body, it is possible to prevent the attachment plate 101 from easily moving too much during assembly. Further, the arrangement of the elastic body can prevent the bolt 108 and the mounting plate 101 from colliding violently and being damaged due to the abrupt movement of the mounting plate 101.
  • a viscoelastic body for example, ring-shaped rubber or resin
  • the above-described effects are obtained. Can be obtained more reliably.
  • the detectors 102 are provided at two locations (each flange portion 101c) of the mounting plate 101, but the present disclosure is not limited to this configuration. As a modification, for example, the detector 102 may be provided only at one position of the mounting plate 101.
  • the mounting plate 101 is formed in a shape surrounding the upper half portion of the inner beam 51, and pads 111 as contacts are respectively provided on the inner edges of the side portions 101b of the mounting plate 101. Attached.
  • the present disclosure is not limited to this configuration.
  • the mounting plate is formed in a rectangular frame shape surrounding the entire circumference of the inner beam 51, and each frame portion (upper frame portion, lower frame portion, and left and right side frame portions) of the mounting plate is formed.
  • a configuration in which contacts are attached to the inner edges can be employed. When this configuration is adopted, not only the mounting plate moves following the inner beam 51 when moving in the left-right direction, but also when the inner beam 51 moves up and down, the mounting plate follows it. Will move.
  • the telescopic beam 50 is formed by nesting two cylindrical members (the inner beam 51 and the outer beam 52). Is not limited to this configuration.
  • the present invention can be applied to a case where the telescopic beam is formed by nesting three or more cylindrical members. That is, in this case, one cylindrical member may come out of the other cylindrical member between two cylindrical members adjacent to each other among three or more cylindrical members.
  • a detector installed at a position and a changing mechanism that changes the position of the detector following the change in the gap between the two cylindrical members can be provided.
  • the position on the near side where one cylindrical member comes out of the other cylindrical member is the position on the rear end side of the adjacent cylindrical member that is connected to or close to the crane body. The position, or the position of the front end side of the cylindrical member connected to or close to the counterweight carriage.
  • the tubular member having a rectangular cross section is adopted as the tubular member, but the present disclosure is not limited to this configuration.
  • a cylindrical member having a cross-sectional shape such as a polygonal shape, a round shape, an oval shape, or an oval shape may be employed.
  • the holding member 131 that holds the detector 122 is configured by one member, but the present disclosure is not limited to this configuration. As a modification, for example, it can be configured by a plurality of members.
  • the case body 121 as shown in FIGS. 18 to 23 is adopted as the “other member” fixed to one cylindrical member, but the present disclosure has this configuration.
  • the intermediate plate may be composed of two or more members, or the case body may be formed in a cylindrical shape.
  • another member can be omitted.
  • an elastic body such as a compression coil spring is interposed between the holding member and one cylindrical member, and the elastic member is attached to the holding member by the urging force of the elastic body. You may comprise so that the made contact member may always be in contact with the other cylindrical member.
  • the crawler crane is adopted as an example of the “mobile crane”, but the present disclosure is not limited to this.
  • a truck crane, a wheel crane, a railway crane, a floating crane on the water, or the like can be adopted.
  • the same effect as described above can be obtained by adopting the same detecting device for preventing the extension beam from coming out.
  • each aspect of the present disclosure is summarized as follows.
  • a crane body and a self-propelled counterweight carriage are connected by an extension beam, and the extension beam has a plurality of cylindrical shapes.
  • a telescopic beam of a mobile crane in which members are arranged in a nested manner is set as a detection target.
  • the detection device for preventing the extension beam from coming out of the mobile crane according to this aspect includes a detector and a fluctuation mechanism.
  • the detector In the cross-sectional direction of the telescopic beam, the detector is between the first and second cylindrical members adjacent to each other inside and outside, and in the telescopic direction of the telescopic beam, the first cylindrical member is At least a portion is installed at a position on the near side that comes out of the second tubular member.
  • the variation mechanism is configured such that the position of the detector with respect to the first and second cylindrical members in the cross-sectional direction of the telescopic beam is a gap between the first and second cylindrical members in the cross-sectional direction of the telescopic beam. Change to follow the change of.
  • the position of the detector follows the change and the mechanism changes.
  • the detector and the cylindrical member on the side of the detected part facing the detector face each other with a predetermined gap therebetween.
  • the changing mechanism changes the position of the detector in the cross-sectional direction of the telescopic beam.
  • the detection device for preventing the extension beam from falling out is configured such that the detector is installed in the first cylindrical member, and the second cylindrical shape is provided. When the detected portion provided on the member is detected, it is detected that the first cylindrical member is in a position on the near side where the first cylindrical member comes out of the second cylindrical member.
  • the first cylindrical member is a cylindrical member arranged on the outside with respect to the second cylindrical member
  • the second cylindrical member is In the case of the cylindrical member arranged on the inner side with respect to the first cylindrical member, it is possible to relatively easily perform installation of a detector, wiring of a signal line connected to the detector, and the like. .
  • the detection device for preventing extension beam escape has the variation mechanism including a holding member, a contact member, and an elastic body.
  • the holding member holds the detector.
  • the contact member is attached to the holding member, and can roll or slide so that the detector faces the second cylindrical member with a predetermined gap in the cross-sectional direction of the telescopic beam. To touch.
  • the elastic body is interposed between the holding member and the first cylindrical member or another member fixed to the cylindrical member, and always brings the contact member into contact with the second cylindrical member. Energize as follows.
  • the contact member attached to the holding member is between the holding member and the first cylindrical member or another member fixed to the first cylindrical member.
  • the detector that is constantly in contact with the second cylindrical member by receiving the urging force (elastic reaction force) of the elastic body inserted in and attached to the second cylindrical member is held by the contact member. It comes to face reliably with a predetermined gap. Therefore, when this mode is adopted, reliable detection as described above and prevention of breakage of components can be more reliably achieved.
  • the detection device for preventing extension beam escape is configured such that the contact member is a rotator that comes into contact with the second cylindrical member so as to allow rolling.
  • the detection device for preventing extension beam escape has the variation mechanism including a holding member and a plurality of contacts.
  • the holding member is attached to the first cylindrical member so as to be movable along a plane orthogonal to the axial direction thereof, and holds the detector.
  • the plurality of contacts are respectively attached to the holding member and are always in contact with the second cylindrical member so that the detector faces the second cylindrical member with a predetermined gap therebetween. It is a member for making.
  • the holding member for holding the detector is attached to the first cylindrical member so as to be movable along a plane orthogonal to the axial direction thereof.
  • Each of the plurality of contacts attached to the detector is always in contact with the second cylindrical member, so that the detector reliably faces the second cylindrical member with a predetermined gap therebetween. You can do that.
  • the detection device for preventing the extension beam from falling out is configured such that the detector is a contact-type detector.
  • the contact-type detector is suitable for outdoor use exposed to dust, wind and rain, and in this aspect in which the contact-type detector is employed as the detector, higher reliability can be obtained.
  • a mobile crane includes a crane main body, a counterweight carriage, a telescopic beam, a detector, a fluctuation mechanism, and a controller.
  • the telescopic beam connects the crane body and the counterweight carriage, and a plurality of cylindrical members are arranged in a nested manner.
  • the detector In the cross-sectional direction of the telescopic beam, the detector is between the first and second cylindrical members adjacent to each other inside and outside, and in the telescopic direction of the telescopic beam, the first cylindrical member is It is detected that at least a part is installed at a position on the near side where the second cylindrical member comes out of the second cylindrical member, and that the first cylindrical member is located on a near side where the second cylindrical member comes out from the second cylindrical member.
  • the variation mechanism is configured such that the position of the detector with respect to the first and second cylindrical members in the cross-sectional direction of the telescopic beam is a gap between the first and second cylindrical members in the cross-sectional direction of the telescopic beam. Change to follow the change of.
  • the controller stops at least one of the counterweight carriage and the crane body when the detector detects that the first cylindrical member is in a position on the near side where the first cylindrical member comes out of the second cylindrical member.
  • the changing mechanism changes the position of the detector in the cross-sectional direction of the telescopic beam.
  • the predetermined clearance gap between the detector and the cylindrical member by the side of the to-be-detected part facing this is maintained.
  • the controller is a self-propelled counterweight carriage or crane. Since the main body is stopped, it is possible to prevent the telescopic beam from coming out or falling off.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

L'invention concerne un dispositif de détection de prévention de délogement pour une flèche extensible et rétractable qui détecte une flèche extensible et rétractable comprenant une pluralité d'éléments cylindriques disposés de manière télescopique. Le dispositif de détection de prévention de délogement pour une flèche extensible et rétractable selon l'invention est pourvu d'un détecteur et d'un mécanisme de changement. Au moins une partie du détecteur est disposée entre des premier et deuxième éléments cylindriques au niveau d'une position avant la position dans laquelle le premier élément cylindrique se déloge du deuxième élément cylindrique dans la direction dans laquelle la flèche extensible et rétractable se déploie et se rétracte, les premier et deuxième éléments cylindriques étant placés l'un à côté de l'autre dans une relation intérieur-extérieur dans le sens de la section transversale de la flèche extensible et rétractable. Le mécanisme de changement permet de modifier la position du détecteur par rapport aux premier et deuxième éléments cylindriques dans le sens de la section transversale de la flèche extensible et rétractable suite à un changement dans l'espacement entre les premier et deuxième éléments cylindriques dans le sens de la section transversale de la flèche extensible et rétractable.
PCT/JP2016/076887 2015-10-13 2016-09-13 Dispositif de détection de prévention de délogement pour flèche extensible et rétractable de grue mobile, et grue mobile WO2017064966A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2015-202385 2015-10-13
JP2015202385 2015-10-13
JP2016091569A JP6288154B2 (ja) 2015-10-13 2016-04-28 移動式クレーンの伸縮ビーム抜け出し防止用検知装置及び移動式クレーン
JP2016-091569 2016-04-28

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207394A (ja) * 1983-05-11 1984-11-24 株式会社神戸製鋼所 超大型クレ−ン
JPH08133680A (ja) * 1994-11-15 1996-05-28 Komatsu Ltd クレーンのブーム位置検出装置
JP2000198674A (ja) * 1998-09-11 2000-07-18 Liebherr Werk Ehingen Gmbh クレ―ン
JP2011207598A (ja) * 2010-03-30 2011-10-20 Tadano Ltd ブーム及びクレーン
US20120160796A1 (en) * 2010-12-22 2012-06-28 Terex Demag Gmbh Crane and method for operating a crane using recovery of energy from crane operations as a secondary energy source

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207394A (ja) * 1983-05-11 1984-11-24 株式会社神戸製鋼所 超大型クレ−ン
JPH08133680A (ja) * 1994-11-15 1996-05-28 Komatsu Ltd クレーンのブーム位置検出装置
JP2000198674A (ja) * 1998-09-11 2000-07-18 Liebherr Werk Ehingen Gmbh クレ―ン
JP2011207598A (ja) * 2010-03-30 2011-10-20 Tadano Ltd ブーム及びクレーン
US20120160796A1 (en) * 2010-12-22 2012-06-28 Terex Demag Gmbh Crane and method for operating a crane using recovery of energy from crane operations as a secondary energy source

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