WO2020129864A1 - Jib anchoring device - Google Patents

Jib anchoring device Download PDF

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Publication number
WO2020129864A1
WO2020129864A1 PCT/JP2019/049061 JP2019049061W WO2020129864A1 WO 2020129864 A1 WO2020129864 A1 WO 2020129864A1 JP 2019049061 W JP2019049061 W JP 2019049061W WO 2020129864 A1 WO2020129864 A1 WO 2020129864A1
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WO
WIPO (PCT)
Prior art keywords
lock
jib
locked
locking
switching member
Prior art date
Application number
PCT/JP2019/049061
Other languages
French (fr)
Japanese (ja)
Inventor
健一 中司
純平 山田
松尾　洋平
Original Assignee
コベルコ建機株式会社
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 コベルコ建機株式会社 filed Critical コベルコ建機株式会社
Priority to SG11202106197WA priority Critical patent/SG11202106197WA/en
Publication of WO2020129864A1 publication Critical patent/WO2020129864A1/en

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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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/26—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 specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
    • 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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/36—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/42—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with jibs of adjustable configuration, e.g. foldable
    • 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
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths

Definitions

  • the present invention relates to a jib mooring device provided in a crane having a boom and a jib attached to the tip of the boom so as to be capable of undulating.
  • Patent Document 1 discloses a jib mooring device for locking a folded jib to a tower in a crane having a tower and a jib.
  • a lock pin is connected to one end of a lock release lever provided on the tower side, and a connection body extending to a boom foot is connected to the other end of the lock release lever.
  • the actuator driving portion
  • the lock release lever rotates about the fulcrum, and the state in which the lock pin locks the jib side locking shaft is released.
  • Patent Document 1 when the actuator becomes inoperable, the operator removes the connecting body from the actuator and pushes or pulls the connecting body, whereby the lock pin locks the locking shaft on the jib side.
  • the state can be set or the state can be released.
  • An object of the present invention is to provide a jib mooring device that can lock and unlock the jib without requiring a pushing operation by an operator on the ground even when the drive unit becomes inoperable. ..
  • a crane having a boom and a jib movably attached to a tip portion of the boom, the jib being capable of being folded with respect to the boom, the crane being provided with the jib.
  • a jib mooring device capable of mooring to the boom. The jib mooring device is provided on the boom and the jib, and can be locked by the locking part when the jib is folded with respect to the boom.
  • a lock switching member that is movable between a locked portion and a lock permitting position and an unlocking position and that can switch the locked state of the locked portion by the locking portion, the lock switching member comprising: The locking portion allows the locked portion to lock the locked portion when placed in the allowance position, and unlocks the locked portion by the locking portion when placed in the lock release position.
  • a lock switching member, a biasing portion that biases the lock switching member so that the lock switching member is located at the lock allowable position, and a biasing force of the biasing portion that is attached to the locking portion.
  • a drive unit capable of moving the lock switching member from the lock allowable position to the lock release position against the lock, and the power of the drive unit is locked to the lock unit when attached to the locking unit.
  • a power transmission mechanism that allows transmission to the switching member while preventing transmission of power of the drive unit to the lock switching member in a non-excited state; It is possible to move the lock switching member from the lock allowing position to the lock releasing position against the biasing force of the biasing portion by being pulled by the worker when the power transmission mechanism is in the non-excited state.
  • a tension member
  • FIG. 3 is an enlarged plan view of the jib mooring device according to the first embodiment of the present invention.
  • FIG. 3 is a sectional view of the jib mooring device according to the first embodiment of the present invention taken along the line AA of FIG. 2.
  • FIG. 3 is a cross-sectional view of the jib mooring device according to the first embodiment of the present invention taken along the line BB in FIG. 2, showing a state in which the locked portion is locked to the locking portion.
  • FIG. 3 is a cross-sectional view of the jib mooring device according to the first embodiment of the present invention taken along the line BB in FIG.
  • FIG. 6 is a cross-sectional view of the jib mooring device according to the second embodiment of the present invention taken along the line BB in FIG. 2, showing a state in which the locked portion is locked to the locking portion.
  • FIG. 9 is a cross-sectional view taken along the line BB of FIG. 2 of the jib mooring device according to the second embodiment of the present invention, showing a state in which the locked portion is unlocked from the locked portion.
  • FIG. 6 is a cross-sectional view of the jib mooring device according to the second embodiment of the present invention taken along the line BB in FIG. 2, showing a state in which the locked portion is not locked by the locking portion.
  • FIG. 2 It is a BB sectional view of FIG. 2 of the jib mooring device which concerns on 2nd Embodiment of this invention, Comprising: It is a figure which shows the state to which the to-be-locked part is locked by a locking part.
  • FIG. 1 is a side view of a tower crane 20 (crane) according to the first embodiment of the present invention.
  • the jib mooring device 1 according to the present embodiment is provided on the tower crane 20.
  • the tower crane 20 includes a crawler-type lower traveling body 21 and an upper rotating body 22 rotatably mounted on the lower traveling body 21.
  • the tower crane 20 may be a mobile crane that uses a moving mechanism (for example, a wheel) other than the crawler, or may be a fixed crane that does not have a moving mechanism.
  • the application target of the present invention is not limited to the tower crane, and the present invention can be applied to other cranes such as a luffing crane, for example.
  • the tower crane 20 includes a cab 23, a tower 24 (boom), a jib 25, a gantry 26, a strut 27, a lower spreader 28, a winch (not shown), a counterweight 29, and a backstop device. 30, a hook 33, a jib guy line 34, a jib hoisting lower spreader 35, a jib guy line 36, a jib hoisting upper spreader 37, a jib hoisting rope 38, a boom guy line 39, an upper spreader 40, and a boom hoisting rope. 41 and a plurality of winches (not shown).
  • the driver's cab 23 is provided in the front part of the upper swing body 22.
  • the tower 24 is connected to the front portion of the upper swing body 22 so as to be capable of undulating with respect to the upper swing body 22.
  • One end of a boom guy line 39 is connected to the tip of the tower 24.
  • the jib 25 is connected to the tip of the tower 24 so that the jib 25 can rise and fall with respect to the tower 24.
  • the jib 25 can be folded with respect to the tower 24 as described later.
  • a jib point sheave 31 is provided at the tip of the jib 25.
  • a hook 33 is suspended from the jib point sheave 31 via a hoisting rope 32.
  • FIG. 1 the working state in which the jib 25 extends diagonally upward and forward is shown by a solid line, and the locked state in which the jib 25 is folded and locked on the front part of the tower 24 is shown by a chain double-dashed line. Has been done.
  • the gantry 26 is attached to the rear part of the upper swing body 22.
  • the strut 27 has a triangular shape in a plan view from the side and is attached to the tip of the tower 24.
  • the strut 27 has a front strut portion 27b and a rear strut portion 27a.
  • the tip of the front strut portion 27b of the strut 27 and the tip of the jib 25 are connected by a jib guy line 34.
  • a jib hoisting rope 38 is stretched between a jib hoisting lower spreader 35 attached to the lower rear surface of the tower 24 and a jib hoisting upper spreader 37 connected to one end of a jib guy line 36.
  • the other end of the jib guy line 36 is connected to the tip of the rear strut portion 27 a of the strut 27.
  • the lower spreader 28 is attached to the upper end of the gantry 26.
  • a boom hoisting rope 41 is stretched between the lower spreader 28 and the upper spreader 40 connected to the other end of the boom guy line 39.
  • the winches are located in the center of the upper swing body 22. Of these, the winch for hook winds or unwinds the hoisting rope 32 to wind up or wind down the hook 33. In addition, the jib undulating winch winds or unwinds the jib undulating rope 38 to undulate the strut 27 around the point of connection with the tip of the tower 24. As a result, the jib 25 undulates around the connection point with the tower 24. Further, the boom hoisting winch winds or unwinds the boom hoisting rope 41 to hoist the tower 24 around the boom foot pin 42 that is the fulcrum thereof.
  • the counterweight 29 is mounted on the rear part of the upper swing body 22.
  • the backstop device 30 is provided on the lower rear surface side of the tower 24.
  • the spring 30a of the backstop device 30 biases the tower 24 forward, so that the tower 24 does not fall backward even when the tower 24 stands up to about 90 degrees with respect to the horizontal direction.
  • FIG. 2 is an enlarged plan view of the jib mooring device 1 according to the present embodiment.
  • FIG. 3 is a sectional view taken along the line AA of FIG. 4 and 5 are sectional views taken along the line BB of FIG.
  • the jib mooring device 1 has a locking device 2 (locking part) and a locked device 3 (locked part), and moors the jib 25 to the tower 24.
  • the locking device 2 is provided on the front surface of the tower 24.
  • the locked device 3 is provided on the jib 25.
  • the locked device 3 is provided at a position facing the locking device 2 when the jib 25 is folded with respect to the tower 24.
  • the locked device 3 is locked by the locking device 2 in a state where the jib 25 is folded, the jib 25 can be locked to the tower 24 in the air.
  • the locking device 2 includes a lock pin 51 extending in the vertical direction, a tower side bracket 52, a casing 53 (FIG. 3), and a pin block member 58.
  • the lock pin 51 locks the locking shaft 61 of the locked device 3 (position shown in FIG. 4) and unlocking position of the locking shaft 61 (position shown in FIG. 5).
  • the jib 25 can be locked and unlocked.
  • the tower side bracket 52 is fixed to the tower 24.
  • the tower side bracket 52 has a lock frame 56 including an upper plate 56S and a lower plate 56T (FIGS. 4 and 5).
  • the upper plate 56S and the lower plate 56T are arranged to face each other with a gap in the vertical direction.
  • a guide cylinder 56a is arranged on the upper plate 56S of the lock frame 56, and a lock hole 56b is formed at a position of the lower plate 56T facing the guide cylinder 56a.
  • the lock pin 51 moves up and down in the guide cylinder 56a along its axial direction, so that the lock pin 51 fits into the lock hole 56b, and the lock pin 51 moves from the lock hole 56b. It is movable to and from the release position, which is a position displaced upward.
  • the pin block member 58 is provided in the lock frame 56.
  • the pin block member 58 is movable in the front-rear direction in the lock frame 56 between the upper plate 56S and the lower plate 56T, and is biased forward by the spring 58a.
  • the pin block member 58 is urged by the spring 58a to a position where it partially closes the guide cylinder 56a.
  • the lock pin 51 is blocked by the pin block member 58 and cannot move to the locking position, that is, it cannot enter the space between the upper plate 56S and the lower plate 56T toward the lock hole 56b. ing.
  • the locked device 3 provided on the jib 25 has a locking shaft 61, a jib side bracket 62 attached to the jib 25, and a pair of left and right shaft support brackets 63. ing.
  • the pair of left and right shaft support brackets 63 are provided on the jib side bracket 62 so as to protrude toward the tower side bracket 52.
  • Bearings 63a are respectively provided at the tips of the pair of left and right shaft support brackets 63, and the pair of left and right bearings 63a supports the locking shaft 61 that intersects (orthogonally intersects) the lock pin 51.
  • the jib mooring device 1 includes a lock release lever 4 (lock switching member), a spring 5 (biasing portion), a motor 6 (driving portion), and a clutch 7 (power transmission mechanism). And a speed reducer.
  • the lock release lever 4 is rotatably connected to the clutch 7 about an axis extending in the front-rear direction of the clutch 7.
  • a lock pin 51 is connected to the left end portion (the right end portion on the paper surface of FIG. 3) of the lock release lever 4 so as to extend downward.
  • the lock release lever 4 is movable (rotatable) between a lock allowable position and a lock release position, and it is possible to switch the locked state of the locked device 3 by the locking device 2. ..
  • the lock release lever 4 allows the locking device 2 to lock the locked device 3 when the lock release lever 4 is placed in the lock allowance position, and is engaged by the lock device 2 when placed in the lock release position. The locking device 3 is released.
  • the lock release lever 4 has a lock permission position (position shown in FIG. 3) for moving the lock pin 51 to the locking position and a lock release position (not shown) for moving the lock pin 51 to the release position. It is movable (rotatable) between.
  • the lock release lever 4 is provided at the right end portion (the left end portion on the paper surface of FIG. 3) of the lock release lever 4 and has a protruding portion 4a extending obliquely downward.
  • the protrusion 4a protrudes from the tower-side bracket 52 of the locking device 2 in a direction orthogonal to the axial direction of the tower 24 when the lock release lever 4 is located at the lock allowable position.
  • the protrusion 4a extends from the tower side bracket 52 of the locking device 2 in the width direction of the tower 24 (arrow DT in FIG. 3, left and right direction) when the lock release lever 4 is located at the lock allowable position.
  • the projecting direction is not limited to this.
  • the protruding portion 4a protrudes from the locking device 2, so that the protruding portion 4a can be visually observed from the cab 23.
  • the side edge 4S connected to the protrusion 4a is arranged (overlapped) along the end surface 52S of the tower side bracket 52, and thus the protrusion as described above. 4a cannot be visually observed.
  • An operator can grasp the state of the lock release lever 4, that is, the state of the lock pin 51, by the difference in the protruding state of the protruding portion 4a.
  • the spring 5 connects the tower side bracket 52 and the lock release lever 4.
  • the spring 5 is connected to the lock release lever 4 between the shaft of the clutch 7 and the lock pin 51 and in the vicinity of the shaft of the clutch 7.
  • the spring 5 urges the lock release lever 4 so that the lock release lever 4 is located at the lock allowable position.
  • the arrangement of the spring 5 is not limited to the above.
  • the motor 6 and the clutch 7 are attached to the locking device 2. Specifically, the motor 6 and the clutch 7 are housed together with the speed reducer in a casing 53 provided in the tower side bracket 52. The motor 6 can move (rotate) the lock release lever 4 from the lock allowable position to the lock release position against the biasing force of the spring 5.
  • the speed reducer is arranged between the motor 6 and the clutch 7 and behind the clutch 7 shown in FIG.
  • the clutch 7 is an electromagnetic clutch, and switches between an excited state and a non-excited state by receiving an exciting current input from a predetermined power source.
  • the clutch 7 transmits the power of the motor 6 to the lock release lever 4 in the excited state (allows the power of the motor 6 to be transmitted to the lock release lever 4).
  • the clutch 7 does not transmit the power of the motor 6 to the lock release lever 4 (blocks the power of the motor 6 from being transmitted to the lock release lever 4) in the non-excited state.
  • the lock release lever 4 is rotatable without being restrained by the motor 6.
  • the jib mooring device 1 has a rope 8 (tensile member).
  • the rope 8 is connected to the right end side of the lock release lever 4 (the left end side on the paper surface of FIG. 3). More specifically, the rope 8 is an end portion connected to a portion of the lock release lever 4 between the shaft of the clutch 7 and the protrusion 4a, and a side opposite to the one end, and is a worker on the ground. And the other end that can be gripped by.
  • the clutch 7 is in the non-excited state, the worker pulls the rope 8 to move the lock release lever 4 from the lock allowance position to the lock release position against the biasing force of the spring 5. ..
  • the lock release lever 4 can be moved from the lock release position to the lock allowance position by the biasing force of the spring 5. is there.
  • the lock release lever 4 may be moved from the lock release position to the lock allowance position by the weight of the lock pin 51.
  • the jib mooring device 1 further includes two limit switches (detection units) 9 and 10, and a controller 11.
  • the limit switch 9 is attached to the tower bracket 52 on the side opposite to the lock pin 51 when viewed from the clutch 7.
  • the limit switch 9 detects that the lock release lever 4 has moved from the lock allowance position to the lock release position.
  • the limit switch 10 is attached to the tower side bracket 52 below the left end of the lock release lever 4 (right end on the paper surface of FIG. 3). When the lock release lever 4 is moved from the lock release position to the lock allowable position, the lower surface of the right end of the lock release lever 4 contacts the limit switch 10. Thereby, the limit switch 10 detects that the lock release lever 4 has moved from the lock release position to the lock allowable position.
  • the controller 11 controls driving and stopping of the motor 6 based on the position of the lock release lever 4. Specifically, the controller 11 drives and stops the motor 6 based on the detection results of the transmission control unit that can switch the clutch 7 between the excited state and the non-excited state and the limit switches 9 and 10. And a drive control unit capable of controlling. Then, when the limit switch 10 detects that the lock release lever 4 is in the lock allowable position, the controller 11 is arranged in the cab 23 and is an operation switch (instructed by the operator for locking the jib 25). When the lock switch is turned on, the clutch 7 is switched from the non-excited state to the excited state, and the motor 6 is rotated. Further, when the limit switch 9 detects that the lock release lever 4 has moved from the lock release position to the lock release position, the controller 11 stops the rotation of the motor 6 and changes the clutch 7 from the excited state to the non-excited state. Switch.
  • the limit switch 9 is not limited to the configuration in which the limit switch 9 detects that the lock release lever 4 has moved from the lock allowable position to the lock release position, and a servo motor (detection unit) may be used as the motor 6.
  • the motor 6 detects that the lock release lever 4 has moved from the lock allowance position to the lock release position from the rotation angle of itself.
  • the controller 11 stops the rotation of the motor 6 and switches the clutch 7 to the non-excitation state based on a signal output from the motor 6 when the lock release lever 4 moves to the lock release position.
  • the lock pin 51 in the locking position locks the locking shaft 61 located on the tower 24 side of the lock pin 51, so that the jib 25 is locked on the front surface of the tower 24.
  • the fact that the jib 25 is in the locked state means that the controller 11 outputs a predetermined signal to the monitor lamp provided in the operator's cab 23 according to the detection results of the limit switches 9 and 10, and the operator is notified by the emission of the monitor lamp. Be informed. Further, the operator can visually check the protruding portion 4 a of the lock release lever 4 from the operator's cab 23. In this state, the clutch 7 is in the non-excited state.
  • the lock pin 51 moves to the release position and the engagement state of the engagement shaft 61 is released. Then, the locking shaft 61 is pushed by the pin block member 58 by the urging force of the spring 58a. At this time, the operator operates the tower crane 20 to raise and lower the jib 25 so that the jib 25 swings forward from the tower 24, whereby the lock of the jib 25 is released. At this time, the lock pin 51 is blocked by the pin block member 58, and the lock pin 51 does not return to the locking position.
  • the controller 11 switches the clutch 7 to the non-excitation state, and the rotation of the motor 6 is stopped.
  • the fact that the limit switch 9 has detected that the lock of the jib 25 has been released is notified to the operator by the monitor lamp provided in the cab 23 by the controller 11 outputting a predetermined signal.
  • the pin 51 moves from the release position to the locking position to prevent the locking shaft 61 from coming off, so that the jib 25 is locked to the tower 24.
  • the limit switch 10 detects that the lock release lever 4 has moved to the lock allowable position again. The fact that the limit switch 10 detects that the jib 25 is locked is notified to the operator by the monitor lamp provided in the cab 23 when the controller 11 outputs a predetermined signal. Further, the operator can see the protruding portion 4a of the lock release lever 4 again from the cab 23.
  • the clutch 7 when the jib 25 folded with respect to the tower 24 is moored to the tower 24, the clutch 7 is de-energized, The locked device 3 can be locked to the locking device 2 by moving the lock release lever 4 from the lock release position to the lock allowable position by the spring 5.
  • the clutch 7 is energized and the motor 6 moves the lock release lever 4 from the lock allowable position to the lock release position. The locking of the locking device 3 to the locking device 2 can be released.
  • the clutch 7 is de-energized, and the lock release lever 4 is moved from the lock allowable position to the lock release position by the rope 8.
  • the locking of the locked device 3 to the locking device 2 can be released.
  • the locked device 3 can be locked to the locking device 2 and the locking of the locked device 3 to the locking device 2 can be released by setting the clutch 7 in the non-excited state.
  • the motor 6 and the clutch 7 attached to the locking device 2 are smaller than the connecting body of Patent Document 1, the motor 6 and the clutch 7 that are lighter than the connecting body can be used. Further, since the clutch 5 is de-energized and the lock release lever 4 can be moved to the lock allowable position by the spring 5, it is not necessary to operate the rope 8 in the pushing direction. Therefore, the rope 8 does not need to have the same rigidity as that of the connected body of Patent Document 1. Therefore, it is possible to use the rope 8 that is lighter than the connected body. Therefore, the mass of the tower 24 can be reduced. Further, the motor 6 and the clutch 7 need not be removed once they are attached to the locking device 2. Furthermore, no assembly such as the connection is required for the rope 8. Therefore, the assemblability can be improved.
  • the projecting portion 4 a projects from the locking device 2 in a direction orthogonal to the axial direction of the tower 24 so that it can be seen from the operator's cab 23 of the tower crane 20. There is. The operator visually confirms the protruding portion 4a from the operator's cab 23 to confirm that the lock release lever 4 is located at the lock allowable position, that is, the locked device 3 is locked by the locking device 2. Can be confirmed.
  • the drive control unit of the controller 11 controls the drive and stop of the motor 6 based on the position of the lock release lever 4 based on the detection results of the limit switches 9 and 10.
  • the motor 6 can be driven when the lock release lever 4 is in the lock allowance position, and the motor 6 can be stopped when the lock release lever 4 is in the lock release position.
  • FIG. 6 to 9 are views corresponding to the BB cross-sectional view of FIG. 2 of the jib mooring device 101 according to the present embodiment.
  • the jib mooring device 101 of the present embodiment has a locking device 102 instead of the locking device 2.
  • the locking device 102 includes a latch 71 and a latch support bracket 73 (bracket, support member).
  • the latch 71 locks the locking shaft 61 of the locked device 3 (position shown in FIG. 6) and unlocks the locking shaft 61 (position shown in FIG. 7). By moving between and, the jib 25 can be locked and unlocked.
  • the latch 71 is rotatably connected to the latch support bracket 73 attached to the tower side bracket 72 via a fulcrum pin 73a.
  • the latch 71 has a claw 71a protruding downward.
  • An engagement groove 71b with which the locking shaft 61 can be engaged is formed on the latch 71 on the latch support bracket 73 side of the claw 71a.
  • an inclined surface 71c inclined from the upper side to the lower side toward the latch support bracket 73 (to approach the engaging groove 71b) is formed. Has been done.
  • the latch 71 is movable (rotatable) between a locking position where the locking shaft 61 engages with the engagement groove 71b and a release position where the locking shaft 61 is disengaged from the engagement groove 71b.
  • a spring 74 is interposed between the latch support bracket 73 and a portion of the latch 71 below the fulcrum pin 73a.
  • the latch 71 is urged by a spring 74 so as to be located at the locking position.
  • the tip of the latch 71 on the opposite side of the latch support bracket 73 is connected to the lock release lever 4 via a rope 75.
  • the connection destination of the rope 75 of the lock release lever 4 is the same position as the portion where the lock pin 51 of FIG. 3 is supported.
  • the jib 25 is locked to the front surface of the tower 24 by the engagement of the engagement shaft 71 with the engagement groove 71b of the latch 71 at the engagement position.
  • the operator is informed that the jib 25 is in the locked state by a monitor lamp provided in the operator's cab 23 as in the first embodiment. Further, the protruding portion 4a (FIG. 3) of the lock release lever 4 can be visually observed from the operator's cab 23. In this state, the clutch 7 (see FIG. 3) is in the non-excited state.
  • the operator turns on the operation switch in the cab 23. Then, the controller 7 causes the clutch 7 to be in an excited state and the motor 6 is rotated. When the clutch 7 transmits the rotation of the motor 6, the lock release lever 4 moves from the lock allowance position to the lock release position (arrow D1 in FIG. 3).
  • a rigid connecting rod or the like may be arranged.
  • a crane having a boom and a jib that is movably attached to a tip portion of the boom and that can be folded with respect to the boom.
  • a jib mooring device capable of mooring a jib to the boom.
  • the jib mooring device is provided on the boom and the jib, and can be locked by the locking part when the jib is folded with respect to the boom.
  • a lock switching member that is movable between a locked portion and a lock allowable position and an unlocked position and that can switch the locked state of the locked portion by the locking portion, the lock switching member comprising: The locking portion allows the locked portion to lock the locked portion when placed in the allowance position, and unlocks the locked portion by the locking portion when placed in the lock release position.
  • a drive unit capable of moving the lock switching member from the lock allowable position to the lock release position against the lock, and the power of the drive unit is locked to the lock unit when attached to the locking unit.
  • a power transmission mechanism that allows transmission to the switching member while preventing transmission of power of the drive unit to the lock switching member in a non-excited state; and a power transmission mechanism connected to the lock switching member, It is possible to move the lock switching member from the lock allowing position to the lock releasing position against the biasing force of the biasing portion by being pulled by the worker when the power transmission mechanism is in the non-excited state.
  • a tension member
  • the power transmission mechanism may further include a transmission control unit capable of switching between the excited state and the non-excited state, the transmission control unit including the jib in a state of being folded with respect to the boom.
  • the power transmission mechanism In order to moorize the boom with the boom, the power transmission mechanism is de-energized, and the lock switching member is moved from the unlocked position to the lock allowing position by the urging force of the urging portion. While locking the locked portion by the stop portion, in order to release the jib moored on the boom from the boom, the power transmission mechanism is set in an excited state, and the lock switching is performed by the power of the drive portion.
  • the lock switching member is arranged in a direction orthogonal to the axial direction of the boom so that a worker can visually recognize the lock switching member from the cab of the crane when the lock switching member is arranged at the lock allowable position. It is desirable to have a protruding portion protruding from the locking portion.
  • At least the detection unit capable of detecting that the lock switching member has moved from the lock allowance position to the lock release position, and the drive of the drive unit based on the detection result of the detection unit.
  • a drive control unit capable of controlling stop.

Abstract

Provided is a jib anchoring device that allows both jib locking and unlocking even when a drive unit is inoperable. The jib anchoring device has a locking device (2) that is provided on a boom, a device to be locked that is provided on the jib and that is locked by the locking device (2), a lock release lever (4), a spring (5), a motor (6), a clutch (7), and a rope (8). The clutch (7) transmits the motor (6) power to the lock release lever 4 when in an energized state but does not transmit the motor (6) power to the lock release lever (4) when in a de-energized state. The rope (8) is connected to the lock release lever (4) and causes the lock release lever (4) to move from a lock permissible position to a lock release position by being pulled by the operator when the clutch (7) is in the de-energized state so as to resist the biasing force of the spring (5).

Description

ジブ係留装置Jib mooring equipment
　本発明は、ブームと当該ブームの先端部に起伏可能に取り付けられたジブとを有するクレーンに備えられるジブ係留装置に関する。 The present invention relates to a jib mooring device provided in a crane having a boom and a jib attached to the tip of the boom so as to be capable of undulating.
　特許文献１には、タワーとジブとを有するクレーンにおいて、折り畳まれた状態のジブをタワーにロックするためのジブ係留装置が開示されている。特許文献１では、タワー側に設けられたロック解除レバーの一端にロックピンが連結され、ロック解除レバーの他端にはブームフットまで延びる連結体が連結されている。アクチュエータ（駆動部）が連結体を引っ張ると、ロック解除レバーが支点を中心に回動し、ロックピンがジブ側の係止軸を係止している状態が解除される。 [Patent Document 1] discloses a jib mooring device for locking a folded jib to a tower in a crane having a tower and a jib. In Patent Document 1, a lock pin is connected to one end of a lock release lever provided on the tower side, and a connection body extending to a boom foot is connected to the other end of the lock release lever. When the actuator (driving portion) pulls the connecting body, the lock release lever rotates about the fulcrum, and the state in which the lock pin locks the jib side locking shaft is released.
特開２０１５－１５５７２７号公報JP, 2005-155727, A
　特許文献１では、アクチュエータが作動不能となった場合に、作業者は、連結体をアクチュエータから取り外し連結体を押し操作または引き操作することによって、ロックピンがジブ側の係止軸を係止する状態にすることも、その状態を解除することもできる。 In Patent Document 1, when the actuator becomes inoperable, the operator removes the connecting body from the actuator and pushes or pulls the connecting body, whereby the lock pin locks the locking shaft on the jib side. The state can be set or the state can be released.
　しかしながら、特許文献１において、連結体は、ブームフットからロック解除レバーまでの数十メートルにわたって変形しない剛性を有する必要がある。このため、連結体の質量が大きくなり、クレーンの能力に影響が生じる。また、連結体を組み立てる作業も煩雑となる。 However, in Patent Document 1, the connected body needs to have rigidity that does not deform over several tens of meters from the boom foot to the lock release lever. For this reason, the mass of the connected body becomes large, and the capacity of the crane is affected. Further, the work of assembling the connected body is also complicated.
　本発明の目的は、駆動部が作動不能となった場合でも、地上の作業者による押し操作を必要とすることなく、ジブのロックおよびロック解除がともに可能なジブ係留装置を提供することである。 An object of the present invention is to provide a jib mooring device that can lock and unlock the jib without requiring a pushing operation by an operator on the ground even when the drive unit becomes inoperable. ..
　本発明によって提供されるのは、ブームと前記ブームの先端部に起伏可能に取り付けられたジブであって前記ブームに対して折り畳まれることが可能なジブとを有するクレーンに備えられ、前記ジブを前記ブームに係留することが可能なジブ係留装置である。当該ジブ係留装置は、前記ブームに設けられた係止部と、前記ジブに設けられ、前記ブームに対して前記ジブが折り畳まれた際に、前記係止部によって係止されることが可能な被係止部と、ロック許容位置とロック解除位置との間で移動可能とされ前記係止部による前記被係止部の係止状態を切り換えることが可能なロック切換部材であって、前記ロック許容位置に配置されると前記係止部が前記被係止部を係止することを許容し、前記ロック解除位置に配置されると前記係止部による前記被係止部の係止を解除する、ロック切換部材と、前記ロック切換部材が前記ロック許容位置に配置されるように前記ロック切換部材を付勢する付勢部と、前記係止部に取り付けられ、前記付勢部の付勢力に抗して前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させることが可能な駆動部と、前記係止部に取り付けられ、励磁状態のときに前記駆動部の動力が前記ロック切換部材に伝達されることを許容する一方、非励磁状態のときに前記駆動部の動力が前記ロック切換部材に伝達されることを阻止する動力伝達機構と、前記ロック切換部材に連結され、前記動力伝達機構が前記非励磁状態のときに作業者によって引っ張られることで、前記付勢部の付勢力に抗して前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させることが可能な引張部材と、を備える。 Provided by the present invention is a crane having a boom and a jib movably attached to a tip portion of the boom, the jib being capable of being folded with respect to the boom, the crane being provided with the jib. A jib mooring device capable of mooring to the boom. The jib mooring device is provided on the boom and the jib, and can be locked by the locking part when the jib is folded with respect to the boom. A lock switching member that is movable between a locked portion and a lock permitting position and an unlocking position and that can switch the locked state of the locked portion by the locking portion, the lock switching member comprising: The locking portion allows the locked portion to lock the locked portion when placed in the allowance position, and unlocks the locked portion by the locking portion when placed in the lock release position. A lock switching member, a biasing portion that biases the lock switching member so that the lock switching member is located at the lock allowable position, and a biasing force of the biasing portion that is attached to the locking portion. And a drive unit capable of moving the lock switching member from the lock allowable position to the lock release position against the lock, and the power of the drive unit is locked to the lock unit when attached to the locking unit. A power transmission mechanism that allows transmission to the switching member while preventing transmission of power of the drive unit to the lock switching member in a non-excited state; It is possible to move the lock switching member from the lock allowing position to the lock releasing position against the biasing force of the biasing portion by being pulled by the worker when the power transmission mechanism is in the non-excited state. A tension member.
本発明の第１実施形態に係るクレーンの側面図である。It is a side view of the crane which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係るジブ係留装置の拡大平面図である。FIG. 3 is an enlarged plan view of the jib mooring device according to the first embodiment of the present invention. 本発明の第１実施形態に係るジブ係留装置の図２のＡ－Ａ断面図である。FIG. 3 is a sectional view of the jib mooring device according to the first embodiment of the present invention taken along the line AA of FIG. 2. 本発明の第１実施形態に係るジブ係留装置の図２のＢ－Ｂ断面図であり、被係止部が係止部に係止された状態を示す図である。FIG. 3 is a cross-sectional view of the jib mooring device according to the first embodiment of the present invention taken along the line BB in FIG. 2, showing a state in which the locked portion is locked to the locking portion. 本発明の第１実施形態に係るジブ係留装置の図２のＢ－Ｂ断面図であり、被係止部の係止部への係止が解除された状態を示す図である。FIG. 3 is a cross-sectional view of the jib mooring device according to the first embodiment of the present invention taken along the line BB in FIG. 2, showing a state in which the locked portion is unlocked from the locked portion. 本発明の第２実施形態に係るジブ係留装置の図２のＢ－Ｂ断面図であり、被係止部が係止部に係止された状態を示す図である。FIG. 6 is a cross-sectional view of the jib mooring device according to the second embodiment of the present invention taken along the line BB in FIG. 2, showing a state in which the locked portion is locked to the locking portion. 本発明の第２実施形態に係るジブ係留装置の図２のＢ－Ｂ断面図であり、被係止部の係止部への係止が解除された状態を示す図である。FIG. 9 is a cross-sectional view taken along the line BB of FIG. 2 of the jib mooring device according to the second embodiment of the present invention, showing a state in which the locked portion is unlocked from the locked portion. 本発明の第２実施形態に係るジブ係留装置の図２のＢ－Ｂ断面図であり、被係止部が係止部に係止されていない状態を示す図である。FIG. 6 is a cross-sectional view of the jib mooring device according to the second embodiment of the present invention taken along the line BB in FIG. 2, showing a state in which the locked portion is not locked by the locking portion. 本発明の第２実施形態に係るジブ係留装置の図２のＢ－Ｂ断面図であり、被係止部が係止部に係止されていく状態を示す図である。It is a BB sectional view of FIG. 2 of the jib mooring device which concerns on 2nd Embodiment of this invention, Comprising: It is a figure which shows the state to which the to-be-locked part is locked by a locking part.
　以下、本発明の好適な実施の形態について、図面を参照しつつ説明する。 Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
［第１実施形態］
　図１は、本発明の第１実施形態に係るタワークレーン２０（クレーン）の側面図である。本実施形態に係るジブ係留装置１は、タワークレーン２０に設けられている。タワークレーン２０は、クローラ式の下部走行体２１と、下部走行体２１上に旋回可能に搭載された上部旋回体２２とを有している。なお、タワークレーン２０は、クローラ以外の移動機構（例えばホイール）を用いた移動式クレーンであってもよいし、移動機構を持たない固定式クレーンであってもよい。また、本発明の適用対象はタワークレーンに限定されず、例えば、ラッフィングクレーンなどの他のクレーンに本発明を適用することも可能である。 [First Embodiment]
FIG. 1 is a side view of a tower crane 20 (crane) according to the first embodiment of the present invention. The jib mooring device 1 according to the present embodiment is provided on the tower crane 20. The tower crane 20 includes a crawler-type lower traveling body 21 and an upper rotating body 22 rotatably mounted on the lower traveling body 21. The tower crane 20 may be a mobile crane that uses a moving mechanism (for example, a wheel) other than the crawler, or may be a fixed crane that does not have a moving mechanism. Further, the application target of the present invention is not limited to the tower crane, and the present invention can be applied to other cranes such as a luffing crane, for example.
　タワークレーン２０は、運転室２３と、タワー２４（ブーム）と、ジブ２５と、ガントリ２６と、ストラット２７と、下部スプレッダ２８と、ウインチ（図示せず）と、カウンタウエイト２９と、バックストップ装置３０と、フック３３と、ジブガイライン３４と、ジブ起伏用下部スプレッダ３５と、ジブガイライン３６と、ジブ起伏用上部スプレッダ３７と、ジブ起伏ロープ３８と、ブームガイライン３９と、上部スプレッダ４０と、ブーム起伏ロープ４１と、不図示の複数のウインチと、を有している。 The tower crane 20 includes a cab 23, a tower 24 (boom), a jib 25, a gantry 26, a strut 27, a lower spreader 28, a winch (not shown), a counterweight 29, and a backstop device. 30, a hook 33, a jib guy line 34, a jib hoisting lower spreader 35, a jib guy line 36, a jib hoisting upper spreader 37, a jib hoisting rope 38, a boom guy line 39, an upper spreader 40, and a boom hoisting rope. 41 and a plurality of winches (not shown).
　運転室２３は、上部旋回体２２の前部に設けられている。タワー２４は、上部旋回体２２の前部に、上部旋回体２２に対して起伏可能に連結されている。タワー２４の先端には、ブームガイライン３９の一端が接続されている。 The driver's cab 23 is provided in the front part of the upper swing body 22. The tower 24 is connected to the front portion of the upper swing body 22 so as to be capable of undulating with respect to the upper swing body 22. One end of a boom guy line 39 is connected to the tip of the tower 24.
　ジブ２５は、タワー２４の先端部に、タワー２４に対して起伏可能に連結されている。なお、ジブ２５は、後記のようにタワー２４に対して折り畳まれることが可能とされている。ジブ２５の先端には、ジブポイントシーブ３１が設けられている。このジブポイントシーブ３１からは巻上ロープ３２を介してフック３３が吊り下げられている。図１では、ジブ２５が斜め上前方に延びた状態である作業状態が実線で示され、ジブ２５が折り畳まれてタワー２４の前面部にロックされた状態であるロック状態が二点鎖線で示されている。 The jib 25 is connected to the tip of the tower 24 so that the jib 25 can rise and fall with respect to the tower 24. The jib 25 can be folded with respect to the tower 24 as described later. A jib point sheave 31 is provided at the tip of the jib 25. A hook 33 is suspended from the jib point sheave 31 via a hoisting rope 32. In FIG. 1, the working state in which the jib 25 extends diagonally upward and forward is shown by a solid line, and the locked state in which the jib 25 is folded and locked on the front part of the tower 24 is shown by a chain double-dashed line. Has been done.
　ガントリ２６は、上部旋回体２２の後部に取り付けられている。ストラット２７は、側方からの平面視で三角形状であって、タワー２４の先端部に取り付けられている。ストラット２７は、フロントストラット部２７ｂとリヤストラット部２７ａとを有する。ストラット２７のフロントストラット部２７ｂの先端とジブ２５の先端とは、ジブガイライン３４により連結されている。 The gantry 26 is attached to the rear part of the upper swing body 22. The strut 27 has a triangular shape in a plan view from the side and is attached to the tip of the tower 24. The strut 27 has a front strut portion 27b and a rear strut portion 27a. The tip of the front strut portion 27b of the strut 27 and the tip of the jib 25 are connected by a jib guy line 34.
　タワー２４の下部背面側に取り付けたジブ起伏用下部スプレッダ３５と、ジブガイライン３６の一端に連結したジブ起伏用上部スプレッダ３７との間には、ジブ起伏ロープ３８が掛け渡されている。ジブガイライン３６の他端は、ストラット２７のリヤストラット部２７ａの先端に接続されている。 A jib hoisting rope 38 is stretched between a jib hoisting lower spreader 35 attached to the lower rear surface of the tower 24 and a jib hoisting upper spreader 37 connected to one end of a jib guy line 36. The other end of the jib guy line 36 is connected to the tip of the rear strut portion 27 a of the strut 27.
　下部スプレッダ２８は、ガントリ２６の上端に取り付けられている。下部スプレッダ２８と、ブームガイライン３９の他端に連結した上部スプレッダ４０との間には、ブーム起伏ロープ４１が掛け渡されている。 The lower spreader 28 is attached to the upper end of the gantry 26. A boom hoisting rope 41 is stretched between the lower spreader 28 and the upper spreader 40 connected to the other end of the boom guy line 39.
　複数のウインチは、上部旋回体２２の中央部に配置されている。このうちフック用ウインチは、巻上ロープ３２を巻き取り又は繰り出してフック３３の巻き上げ又は巻き下げを行う。また、ジブ起伏用ウインチは、ジブ起伏ロープ３８を巻き取り又は繰り出すことで、ストラット２７を、タワー２４の先端部との結合点を中心に起伏させる。この結果、ジブ２５がタワー２４との結合点を中心として起伏する。更に、ブーム起伏用ウインチは、ブーム起伏ロープ４１を巻き取り又は繰り出すことで、タワー２４を、その支点であるブームフットピン４２回りに起伏させる。 　The winches are located in the center of the upper swing body 22. Of these, the winch for hook winds or unwinds the hoisting rope 32 to wind up or wind down the hook 33. In addition, the jib undulating winch winds or unwinds the jib undulating rope 38 to undulate the strut 27 around the point of connection with the tip of the tower 24. As a result, the jib 25 undulates around the connection point with the tower 24. Further, the boom hoisting winch winds or unwinds the boom hoisting rope 41 to hoist the tower 24 around the boom foot pin 42 that is the fulcrum thereof.
　カウンタウエイト２９は、上部旋回体２２の後部に搭載されている。バックストップ装置３０は、タワー２４の下部背面側に設けられている。バックストップ装置３０のばね３０ａがタワー２４を前方に付勢することで、タワー２４が水平方向に対して略９０度起立した状態であっても、タワー２４が後方に転倒することがない。 The counterweight 29 is mounted on the rear part of the upper swing body 22. The backstop device 30 is provided on the lower rear surface side of the tower 24. The spring 30a of the backstop device 30 biases the tower 24 forward, so that the tower 24 does not fall backward even when the tower 24 stands up to about 90 degrees with respect to the horizontal direction.
　ジブ係留装置１の詳細について説明する。図２は、本実施形態に係るジブ係留装置１の拡大平面図である。図３は、図２のＡ－Ａ断面図である。図４，図５は、それぞれ図２のＢ－Ｂ断面図である。 Details of the jib mooring device 1 will be described. FIG. 2 is an enlarged plan view of the jib mooring device 1 according to the present embodiment. FIG. 3 is a sectional view taken along the line AA of FIG. 4 and 5 are sectional views taken along the line BB of FIG.
　図２に示すように、ジブ係留装置１は、係止装置２（係止部）と、被係止装置３（被係止部）と、を有し、ジブ２５をタワー２４に係留することが可能とされている。図１に示すように、係止装置２は、タワー２４の前面部に設けられている。被係止装置３は、ジブ２５に設けられている。被係止装置３は、タワー２４に対してジブ２５が折り畳まれた際に係止装置２に対向する位置に設けられている。ジブ２５が折り畳まれた状態で被係止装置３が係止装置２によって係止されることで、空中でジブ２５をタワー２４にロックすることができる。 As shown in FIG. 2, the jib mooring device 1 has a locking device 2 (locking part) and a locked device 3 (locked part), and moors the jib 25 to the tower 24. Is possible. As shown in FIG. 1, the locking device 2 is provided on the front surface of the tower 24. The locked device 3 is provided on the jib 25. The locked device 3 is provided at a position facing the locking device 2 when the jib 25 is folded with respect to the tower 24. When the locked device 3 is locked by the locking device 2 in a state where the jib 25 is folded, the jib 25 can be locked to the tower 24 in the air.
　図４，図５に示すように、係止装置２は、上下方向に延びるロックピン５１と、タワー側ブラケット５２と、ケーシング５３（図３）と、ピンブロック部材５８と、を有する。ロックピン５１が、被係止装置３の係止軸６１を係止する係止位置（図４に示す位置）と、係止軸６１の係止を解除する解除位置（図５に示す位置）との間で移動することによって、ジブ２５のロックおよびロック解除を実現することができる。 As shown in FIGS. 4 and 5, the locking device 2 includes a lock pin 51 extending in the vertical direction, a tower side bracket 52, a casing 53 (FIG. 3), and a pin block member 58. The lock pin 51 locks the locking shaft 61 of the locked device 3 (position shown in FIG. 4) and unlocking position of the locking shaft 61 (position shown in FIG. 5). By moving between and, the jib 25 can be locked and unlocked.
　タワー側ブラケット５２は、タワー２４に固定されている。タワー側ブラケット５２は、上板５６Ｓと下板５６Ｔとを含むロックフレーム５６を有する（図４、図５）。上板５６Ｓと下板５６Ｔとは上下方向に間隔をおいて互いに対向して配置されている。ロックフレーム５６の上板５６Ｓには、ガイド筒５６ａが配置されるとともに、下板５６Ｔのうちガイド筒５６ａに相対する位置にロック穴５６ｂが形成されている。ロックピン５１は、その軸方向に沿ってガイド筒５６ａ内を上下に移動することによって、ロックピン５１がロック穴５６ｂに嵌合する位置である係止位置と、ロックピン５１がロック穴５６ｂから上方に外れた位置である解除位置との間で移動可能となっている。 The tower side bracket 52 is fixed to the tower 24. The tower side bracket 52 has a lock frame 56 including an upper plate 56S and a lower plate 56T (FIGS. 4 and 5). The upper plate 56S and the lower plate 56T are arranged to face each other with a gap in the vertical direction. A guide cylinder 56a is arranged on the upper plate 56S of the lock frame 56, and a lock hole 56b is formed at a position of the lower plate 56T facing the guide cylinder 56a. The lock pin 51 moves up and down in the guide cylinder 56a along its axial direction, so that the lock pin 51 fits into the lock hole 56b, and the lock pin 51 moves from the lock hole 56b. It is movable to and from the release position, which is a position displaced upward.
　ピンブロック部材５８は、ロックフレーム５６内に設けられている。ピンブロック部材５８は、上板５６Ｓと下板５６Ｔとの間でロックフレーム５６内を前後方向に移動可能であり、スプリング５８ａによって前方に付勢されている。図５に示すように、ロックピン５１が解除位置にあるときには、ピンブロック部材５８がガイド筒５６ａの一部を閉塞する位置までスプリング５８ａによって付勢される。これによって、ロックピン５１がピンブロック部材５８によってブロックされ、係止位置に移動できないように、すなわち、上板５６Ｓと下板５６Ｔとの間の空間にロック穴５６ｂに向かって進入できないようになっている。 The pin block member 58 is provided in the lock frame 56. The pin block member 58 is movable in the front-rear direction in the lock frame 56 between the upper plate 56S and the lower plate 56T, and is biased forward by the spring 58a. As shown in FIG. 5, when the lock pin 51 is in the release position, the pin block member 58 is urged by the spring 58a to a position where it partially closes the guide cylinder 56a. As a result, the lock pin 51 is blocked by the pin block member 58 and cannot move to the locking position, that is, it cannot enter the space between the upper plate 56S and the lower plate 56T toward the lock hole 56b. ing.
　図２に示すように、ジブ２５に設けられた被係止装置３は、係止軸６１と、ジブ２５に取り付けられたジブ側ブラケット６２と、左右一対の軸支持ブラケット６３と、を有している。係止軸６１がロックピン５１によって係止されることで、折り畳まれた状態のジブ２５がタワー２４にロックされる。左右一対の軸支持ブラケット６３は、タワー側ブラケット５２に向かってジブ側ブラケット６２に突設されている。左右一対の軸支持ブラケット６３の先端にはベアリング６３ａがそれぞれ設けられており、左右一対のベアリング６３ａによりロックピン５１と交差する（直交する）係止軸６１が支持されている。 As shown in FIG. 2, the locked device 3 provided on the jib 25 has a locking shaft 61, a jib side bracket 62 attached to the jib 25, and a pair of left and right shaft support brackets 63. ing. When the locking shaft 61 is locked by the lock pin 51, the jib 25 in the folded state is locked to the tower 24. The pair of left and right shaft support brackets 63 are provided on the jib side bracket 62 so as to protrude toward the tower side bracket 52. Bearings 63a are respectively provided at the tips of the pair of left and right shaft support brackets 63, and the pair of left and right bearings 63a supports the locking shaft 61 that intersects (orthogonally intersects) the lock pin 51.
　また、図３に示すように、ジブ係留装置１は、ロック解除レバー４（ロック切換部材）と、スプリング５（付勢部）と、モータ６（駆動部）と、クラッチ７（動力伝達機構）と、減速機と、を有している。 Further, as shown in FIG. 3, the jib mooring device 1 includes a lock release lever 4 (lock switching member), a spring 5 (biasing portion), a motor 6 (driving portion), and a clutch 7 (power transmission mechanism). And a speed reducer.
　ロック解除レバー４は、クラッチ７の前後方向に延びる軸を中心に回動可能にクラッチ７に連結されている。ロック解除レバー４の左端部（図３の紙面における右端部）には、ロックピン５１が下方に延びるように連結されている。ロック解除レバー４は、ロック許容位置とロック解除位置との間で移動可能（回動可能）とされ、係止装置２による被係止装置３の係止状態を切り換えることが可能とされている。ロック解除レバー４は、ロック許容位置に配置されると、係止装置２が被係止装置３を係止することを許容し、ロック解除位置に配置されると、係止装置２による被係止装置３の係止を解除する。言い換えれば、ロック解除レバー４は、ロックピン５１を係止位置に移動させるロック許容位置（図３に示す位置）と、ロックピン５１を解除位置に移動させるロック解除位置（図示せず）との間で移動可能（回動可能）である。 The lock release lever 4 is rotatably connected to the clutch 7 about an axis extending in the front-rear direction of the clutch 7. A lock pin 51 is connected to the left end portion (the right end portion on the paper surface of FIG. 3) of the lock release lever 4 so as to extend downward. The lock release lever 4 is movable (rotatable) between a lock allowable position and a lock release position, and it is possible to switch the locked state of the locked device 3 by the locking device 2. .. The lock release lever 4 allows the locking device 2 to lock the locked device 3 when the lock release lever 4 is placed in the lock allowance position, and is engaged by the lock device 2 when placed in the lock release position. The locking device 3 is released. In other words, the lock release lever 4 has a lock permission position (position shown in FIG. 3) for moving the lock pin 51 to the locking position and a lock release position (not shown) for moving the lock pin 51 to the release position. It is movable (rotatable) between.
　ロック解除レバー４は、その右端部（図３の紙面における左端部）に配置され、斜め下方に延在する突出部４ａを有する。この突出部４ａは、ロック解除レバー４がロック許容位置に位置した際に、タワー２４の軸方向に直交する方向に係止装置２のタワー側ブラケット５２から突出する。本実施形態では、突出部４ａは、ロック解除レバー４がロック許容位置に位置した際に、タワー２４の幅方向（図３の矢印ＤＴ、左右方向）に係止装置２のタワー側ブラケット５２から突出するが、突出する方向はこれに限定されない。ロック解除レバー４がロック許容位置に位置した際に、突出部４ａが係止装置２から突出することで、運転室２３から突出部４ａを目視することが可能になっている。なお、ロック解除レバー４がロック解除位置に位置すると、突出部４ａに連なる側縁４Ｓが、タワー側ブラケット５２の端面５２Ｓに沿って（重なるように）配置されるため、上記のように突出部４ａの目視が不可能となる。この突出部４ａの突出状態の違いによって、作業者はロック解除レバー４の状態、すなわち、ロックピン５１の状態を把握することができる。 The lock release lever 4 is provided at the right end portion (the left end portion on the paper surface of FIG. 3) of the lock release lever 4 and has a protruding portion 4a extending obliquely downward. The protrusion 4a protrudes from the tower-side bracket 52 of the locking device 2 in a direction orthogonal to the axial direction of the tower 24 when the lock release lever 4 is located at the lock allowable position. In the present embodiment, the protrusion 4a extends from the tower side bracket 52 of the locking device 2 in the width direction of the tower 24 (arrow DT in FIG. 3, left and right direction) when the lock release lever 4 is located at the lock allowable position. Although it projects, the projecting direction is not limited to this. When the lock release lever 4 is located at the lock allowable position, the protruding portion 4a protrudes from the locking device 2, so that the protruding portion 4a can be visually observed from the cab 23. When the lock release lever 4 is located at the lock release position, the side edge 4S connected to the protrusion 4a is arranged (overlapped) along the end surface 52S of the tower side bracket 52, and thus the protrusion as described above. 4a cannot be visually observed. An operator can grasp the state of the lock release lever 4, that is, the state of the lock pin 51, by the difference in the protruding state of the protruding portion 4a.
　スプリング５は、タワー側ブラケット５２とロック解除レバー４とを連結している。本実施形態では、スプリング５は、ロック解除レバー４のうち、クラッチ７の軸とロックピン５１との間であって、クラッチ７の軸の近傍に接続されている。スプリング５は、ロック解除レバー４がロック許容位置に配置されるようにロック解除レバー４を付勢している。なお、スプリング５の配置は、上記に限定されるものではない。 The spring 5 connects the tower side bracket 52 and the lock release lever 4. In the present embodiment, the spring 5 is connected to the lock release lever 4 between the shaft of the clutch 7 and the lock pin 51 and in the vicinity of the shaft of the clutch 7. The spring 5 urges the lock release lever 4 so that the lock release lever 4 is located at the lock allowable position. The arrangement of the spring 5 is not limited to the above.
　モータ６およびクラッチ７は、係止装置２に取り付けられている。具体的には、モータ６およびクラッチ７は、減速機とともに、タワー側ブラケット５２に設けられたケーシング５３に収容されている。モータ６は、スプリング５の付勢力に抗してロック解除レバー４をロック許容位置からロック解除位置に移動（回転）させることが可能である。減速機は、モータ６とクラッチ７との間であって、図３に示すクラッチ７の背後に配置されている。 The motor 6 and the clutch 7 are attached to the locking device 2. Specifically, the motor 6 and the clutch 7 are housed together with the speed reducer in a casing 53 provided in the tower side bracket 52. The motor 6 can move (rotate) the lock release lever 4 from the lock allowable position to the lock release position against the biasing force of the spring 5. The speed reducer is arranged between the motor 6 and the clutch 7 and behind the clutch 7 shown in FIG.
　クラッチ７は、電磁クラッチであり、所定の電源から励磁電流の入力を受けることで、励磁状態と非励磁状態との間で切り換わる。クラッチ７は、励磁状態のときに、モータ６の動力をロック解除レバー４に伝達する（モータ６の動力がロック解除レバー４に伝達されることを許容する）。これにより、クラッチ７が励磁状態のときに、ロック解除レバー４は回転自在でなくなり、モータ６により拘束されながら回転される。一方、クラッチ７は、非励磁状態のときに、モータ６の動力をロック解除レバー４に伝達しない（モータ６の動力がロック解除レバー４に伝達されることを阻止する）。これにより、クラッチ７が非励磁状態のときに、ロック解除レバー４はモータ６によって拘束されることなく回転自在となる。 The clutch 7 is an electromagnetic clutch, and switches between an excited state and a non-excited state by receiving an exciting current input from a predetermined power source. The clutch 7 transmits the power of the motor 6 to the lock release lever 4 in the excited state (allows the power of the motor 6 to be transmitted to the lock release lever 4). As a result, when the clutch 7 is in the excited state, the lock release lever 4 is not rotatable and is rotated while being restrained by the motor 6. On the other hand, the clutch 7 does not transmit the power of the motor 6 to the lock release lever 4 (blocks the power of the motor 6 from being transmitted to the lock release lever 4) in the non-excited state. As a result, when the clutch 7 is in the non-excited state, the lock release lever 4 is rotatable without being restrained by the motor 6.
　また、図３に示すように、ジブ係留装置１は、ロープ８（引張部材）を有している。ロープ８は、ロック解除レバー４の右端側（図３の紙面における左端側）に連結されている。より詳しくは、ロープ８は、ロック解除レバー４のうちクラッチ７の軸と突出部４ａとの間の部分に接続される一端部と、当該一端部とは反対側であって、地上の作業者によって把持されることが可能な他端部とを有する。クラッチ７が非励磁状態のときに、作業者がロープ８を引っ張ることにより、スプリング５による付勢力に抗して、ロック解除レバー４をロック許容位置からロック解除位置に移動させることが可能である。また、クラッチ７が非励磁状態のときに、作業者がロープ８を引っ張るのを止めると、スプリング５による付勢力によって、ロック解除レバー４をロック解除位置からロック許容位置に移動させることが可能である。なお、ロックピン５１の自重でロック解除レバー４がロック解除位置からロック許容位置に移動する構成であってもよい。 Further, as shown in FIG. 3, the jib mooring device 1 has a rope 8 (tensile member). The rope 8 is connected to the right end side of the lock release lever 4 (the left end side on the paper surface of FIG. 3). More specifically, the rope 8 is an end portion connected to a portion of the lock release lever 4 between the shaft of the clutch 7 and the protrusion 4a, and a side opposite to the one end, and is a worker on the ground. And the other end that can be gripped by. When the clutch 7 is in the non-excited state, the worker pulls the rope 8 to move the lock release lever 4 from the lock allowance position to the lock release position against the biasing force of the spring 5. .. Further, when the worker stops pulling the rope 8 while the clutch 7 is in the non-excited state, the lock release lever 4 can be moved from the lock release position to the lock allowance position by the biasing force of the spring 5. is there. The lock release lever 4 may be moved from the lock release position to the lock allowance position by the weight of the lock pin 51.
　また、図３に示すように、ジブ係留装置１は、２つのリミットスイッチ（検出部）９，１０と、コントローラ１１と、を更に有している。リミットスイッチ９は、クラッチ７から見てロックピン５１とは反対側において、タワー側ブラケット５２に取り付けられている。ロック解除レバー４がロック許容位置からロック解除位置に移動されると、ロック解除レバー４の下側の側面がリミットスイッチ９に当接する。これにより、リミットスイッチ９は、ロック解除レバー４がロック許容位置からロック解除位置に移動したことを検出する。 Further, as shown in FIG. 3, the jib mooring device 1 further includes two limit switches (detection units) 9 and 10, and a controller 11. The limit switch 9 is attached to the tower bracket 52 on the side opposite to the lock pin 51 when viewed from the clutch 7. When the lock release lever 4 is moved from the lock allowable position to the lock release position, the lower side surface of the lock release lever 4 contacts the limit switch 9. Accordingly, the limit switch 9 detects that the lock release lever 4 has moved from the lock allowance position to the lock release position.
　リミットスイッチ１０は、ロック解除レバー４の左端（図３の紙面における右端）の下方において、タワー側ブラケット５２に取り付けられている。ロック解除レバー４がロック解除位置からロック許容位置に移動されると、ロック解除レバー４の右端の下面がリミットスイッチ１０に当接する。これにより、リミットスイッチ１０は、ロック解除レバー４がロック解除位置からロック許容位置に移動したことを検出する。 The limit switch 10 is attached to the tower side bracket 52 below the left end of the lock release lever 4 (right end on the paper surface of FIG. 3). When the lock release lever 4 is moved from the lock release position to the lock allowable position, the lower surface of the right end of the lock release lever 4 contacts the limit switch 10. Thereby, the limit switch 10 detects that the lock release lever 4 has moved from the lock release position to the lock allowable position.
　コントローラ１１は、ロック解除レバー４の位置に基づいて、モータ６の駆動および停止を制御する。具体的には、コントローラ１１は、クラッチ７を前記励磁状態と前記非励磁状態との間で切り換え可能な伝達制御部と、リミットスイッチ９、１０の検出結果に基づいて、モータ６の駆動および停止を制御することが可能な駆動制御部と、を有する。そして、コントローラ１１は、ロック解除レバー４がロック許容位置にあることをリミットスイッチ１０が検出しているときに、運転室２３に配置され作業者がジブ２５のロックを指示するための操作スイッチ（ロックスイッチ）がオンにされると、クラッチ７を非励磁状態から励磁状態に切り替え、モータ６を回転させる。また、コントローラ１１は、ロック解除レバー４がロック許容位置からロック解除位置に移動したことをリミットスイッチ９が検出したときに、モータ６の回転を停止させ、クラッチ７を励磁状態から非励磁状態に切り替える。 The controller 11 controls driving and stopping of the motor 6 based on the position of the lock release lever 4. Specifically, the controller 11 drives and stops the motor 6 based on the detection results of the transmission control unit that can switch the clutch 7 between the excited state and the non-excited state and the limit switches 9 and 10. And a drive control unit capable of controlling. Then, when the limit switch 10 detects that the lock release lever 4 is in the lock allowable position, the controller 11 is arranged in the cab 23 and is an operation switch (instructed by the operator for locking the jib 25). When the lock switch is turned on, the clutch 7 is switched from the non-excited state to the excited state, and the motor 6 is rotated. Further, when the limit switch 9 detects that the lock release lever 4 has moved from the lock release position to the lock release position, the controller 11 stops the rotation of the motor 6 and changes the clutch 7 from the excited state to the non-excited state. Switch.
　なお、ロック解除レバー４がロック許容位置からロック解除位置に移動したことをリミットスイッチ９で検出する構成に限定されず、モータ６としてサーボモータ（検知部）を使用する構成であってもよい。この構成の場合、モータ６は、ロック解除レバー４がロック許容位置からロック解除位置に移動したことを、自身の回転角度から検知する。コントローラ１１は、ロック解除レバー４がロック解除位置に移動した際にモータ６から出力される信号に基づいて、モータ６の回転を停止させ、クラッチ７を非励磁状態に切り替える。 The limit switch 9 is not limited to the configuration in which the limit switch 9 detects that the lock release lever 4 has moved from the lock allowable position to the lock release position, and a servo motor (detection unit) may be used as the motor 6. In the case of this configuration, the motor 6 detects that the lock release lever 4 has moved from the lock allowance position to the lock release position from the rotation angle of itself. The controller 11 stops the rotation of the motor 6 and switches the clutch 7 to the non-excitation state based on a signal output from the motor 6 when the lock release lever 4 moves to the lock release position.
　次に、ジブ係留装置１の動作について説明する。 Next, the operation of the jib mooring device 1 will be described.
　図４に示すように、係止位置にあるロックピン５１により、ロックピン５１よりもタワー２４側に位置する係止軸６１が係止されることで、ジブ２５がタワー２４の前面部にロックされる。ジブ２５がロック状態であることは、リミットスイッチ９、１０の検出結果に応じてコントローラ１１が所定の信号を運転室２３に設けられたモニタランプに出力し、当該モニタランプの発光より作業者に報知される。また、作業者は、運転室２３からロック解除レバー４の突出部４ａを目視することができる。この状態において、クラッチ７は非励磁状態にされている。 As shown in FIG. 4, the lock pin 51 in the locking position locks the locking shaft 61 located on the tower 24 side of the lock pin 51, so that the jib 25 is locked on the front surface of the tower 24. To be done. The fact that the jib 25 is in the locked state means that the controller 11 outputs a predetermined signal to the monitor lamp provided in the operator's cab 23 according to the detection results of the limit switches 9 and 10, and the operator is notified by the emission of the monitor lamp. Be informed. Further, the operator can visually check the protruding portion 4 a of the lock release lever 4 from the operator's cab 23. In this state, the clutch 7 is in the non-excited state.
　ジブ２５のロックを解除する場合には、作業者が運転室２３に配置され作業者がジブ２５のロックを解除するため操作スイッチ（解除スイッチ）をオンにする。すると、図３に示すように、コントローラ１１により、クラッチ７が励磁状態にされ、モータ６が回転される。モータ６の回転をクラッチ７が伝達することで、ロック解除レバー４がロック許容位置からロック解除位置に移動する（図３の矢印Ｄ１）。 When unlocking the jib 25, a worker is placed in the cab 23 and the worker turns on the operation switch (release switch) to unlock the jib 25. Then, as shown in FIG. 3, the controller 7 energizes the clutch 7 and rotates the motor 6. When the clutch 7 transmits the rotation of the motor 6, the lock release lever 4 moves from the lock allowance position to the lock release position (arrow D1 in FIG. 3).
　この結果、図５に示すように、ロックピン５１が解除位置に移動し、係止軸６１の係止状態が解除される。すると、係止軸６１がスプリング５８ａの付勢力によってピンブロック部材５８に押される。このとき、作業者がタワークレーン２０を操作してジブ２５をタワー２４から前方に振り出すように起伏させることで、ジブ２５のロックが解除される。このとき、ロックピン５１はピンブロック部材５８によってブロックされ、ロックピン５１が係止位置に戻ることはない。 As a result, as shown in FIG. 5, the lock pin 51 moves to the release position and the engagement state of the engagement shaft 61 is released. Then, the locking shaft 61 is pushed by the pin block member 58 by the urging force of the spring 58a. At this time, the operator operates the tower crane 20 to raise and lower the jib 25 so that the jib 25 swings forward from the tower 24, whereby the lock of the jib 25 is released. At this time, the lock pin 51 is blocked by the pin block member 58, and the lock pin 51 does not return to the locking position.
　ロック解除レバー４がロック解除位置に移動したことを図３のリミットスイッチ９が検知すると、コントローラ１１により、クラッチ７が非励磁状態に切り替えられ、モータ６の回転が停止される。ジブ２５のロックが解除されたことをリミットスイッチ９が検知したことは、コントローラ１１が所定の信号を出力することで、運転室２３に設けられたモニタランプにより作業者に報知される。 When the limit switch 9 shown in FIG. 3 detects that the lock release lever 4 has moved to the lock release position, the controller 11 switches the clutch 7 to the non-excitation state, and the rotation of the motor 6 is stopped. The fact that the limit switch 9 has detected that the lock of the jib 25 has been released is notified to the operator by the monitor lamp provided in the cab 23 by the controller 11 outputting a predetermined signal.
　クラッチ７が非励磁状態に切り替えられると、スプリング５の付勢力によってロック解除レバー４がロック許容位置に移動しようとするが、図５に示すように、ロックピン５１はピンブロック部材５８によってブロックされているため、ロック解除レバー４がロック許容位置に戻ることはない。 When the clutch 7 is switched to the non-excited state, the lock release lever 4 tries to move to the lock allowable position by the urging force of the spring 5, but the lock pin 51 is blocked by the pin block member 58 as shown in FIG. Therefore, the lock release lever 4 does not return to the lock allowable position.
　ジブ２５をロックする場合には、図５に示す状態において、ジブ２５をタワー２４の前面に向かって折り畳む。このとき、クラッチ７は非励磁状態である。ジブ２５を折り畳むと、係止軸６１がピンブロック部材５８に当接し、スプリング５８ａの付勢力に抗してピンブロック部材５８をタワー２４側に押し込む。その結果、ピンブロック部材５８によるロックピン５１のブロックが解除され、スプリング５の付勢力によりロック解除レバー４がロック解除位置からロック許容位置に移動する（図３の矢印Ｄ２）のと同時に、ロックピン５１が解除位置から係止位置に移動し係止軸６１の脱離を阻止することで、ジブ２５がタワー２４にロックされる。リミットスイッチ１０は、ロック解除レバー４が再びロック許容位置に移動したことを検知する。ジブ２５がロックされたことをリミットスイッチ１０が検知したことは、コントローラ１１が所定の信号を出力することで、運転室２３に設けられたモニタランプにより作業者に報知される。また、作業者は、運転室２３からロック解除レバー４の突出部４ａを再び目視することができる。 When locking the jib 25, fold the jib 25 toward the front of the tower 24 in the state shown in FIG. At this time, the clutch 7 is in a non-excited state. When the jib 25 is folded, the locking shaft 61 contacts the pin block member 58 and pushes the pin block member 58 toward the tower 24 side against the biasing force of the spring 58a. As a result, the block of the lock pin 51 by the pin block member 58 is released, and the urging force of the spring 5 moves the lock release lever 4 from the lock release position to the lock permissible position (arrow D2 in FIG. 3) and at the same time, the lock is released. The pin 51 moves from the release position to the locking position to prevent the locking shaft 61 from coming off, so that the jib 25 is locked to the tower 24. The limit switch 10 detects that the lock release lever 4 has moved to the lock allowable position again. The fact that the limit switch 10 detects that the jib 25 is locked is notified to the operator by the monitor lamp provided in the cab 23 when the controller 11 outputs a predetermined signal. Further, the operator can see the protruding portion 4a of the lock release lever 4 again from the cab 23.
　なお、ジブ２５のロック状態において、図３に示されるロープ８を作業者が地上から引っ張ることで、スプリング５による付勢力に抗してロック解除レバー４をロック許容位置からロック解除位置に移動させることができる。これにより、モータ６の動力によらずに、被係止装置３の係止装置２への係止を解除することができる。また、作業者がロープ８に付与する引っ張り力を弱めると、スプリング５の付勢力によってロック解除レバー４が再びロック解除位置からロック許容位置に移動することができる。このため、手動によるロックおよびロック解除が可能となる。 In the locked state of the jib 25, an operator pulls the rope 8 shown in FIG. 3 from the ground to move the lock release lever 4 from the lock allowance position to the lock release position against the biasing force of the spring 5. be able to. As a result, the locking of the locked device 3 with the locking device 2 can be released regardless of the power of the motor 6. When the worker weakens the pulling force applied to the rope 8, the lock release lever 4 can be moved again from the lock release position to the lock allowance position by the urging force of the spring 5. Therefore, it is possible to lock and unlock manually.
　以上に述べたように、本実施形態に係るジブ係留装置１によると、タワー２４に対して折り畳まれた状態のジブ２５をタワー２４に係留する際には、クラッチ７を非励磁状態にして、スプリング５によりロック解除レバー４をロック解除位置からロック許容位置に移動させることで、被係止装置３を係止装置２に係止することができる。一方、タワー２４に係留されたジブ２５をタワー２４から解放する際には、クラッチ７を励磁状態にして、モータ６でロック解除レバー４をロック許容位置からロック解除位置に移動させることで、被係止装置３の係止装置２への係止を解除することができる。または、タワー２４に係留されたジブ２５をタワー２４から解放する際には、クラッチ７を非励磁状態にして、ロープ８でロック解除レバー４をロック許容位置からロック解除位置に移動させることで、被係止装置３の係止装置２への係止を解除することができる。このように、クラッチ７を非励磁状態にすることで、被係止装置３を係止装置２に係止することも、被係止装置３の係止装置２への係止を解除することも可能になる。よって、モータ６（アクチュエータ）が作動可能な場合だけでなく、モータ６が作動不能となった場合においても、ジブ２５のロックおよびロック解除がともに可能である。また、係止装置２に取り付けられるモータ６およびクラッチ７は、特許文献１の連結体よりも小さいので、モータ６およびクラッチ７には、前記連結体よりも軽量なものを使用できる。さらに、クラッチ７を非励磁状態にしてスプリング５でロック解除レバー４をロック許容位置に移動できるので、ロープ８を押し方向に操作する必要がない。よって、ロープ８には特許文献１の連結体ほどの剛性は不要である。このため、ロープ８にも、連結体よりも軽量なものを使用できる。よって、タワー２４の質量を軽減することができる。また、モータ６とクラッチ７とは、係止装置２に一度取り付けたら取り外しは不要である。さらに、前記連結体のような組立はロープ８には不要である。よって、組立性を向上させることができる。 As described above, according to the jib mooring device 1 according to the present embodiment, when the jib 25 folded with respect to the tower 24 is moored to the tower 24, the clutch 7 is de-energized, The locked device 3 can be locked to the locking device 2 by moving the lock release lever 4 from the lock release position to the lock allowable position by the spring 5. On the other hand, when the jib 25 moored to the tower 24 is released from the tower 24, the clutch 7 is energized and the motor 6 moves the lock release lever 4 from the lock allowable position to the lock release position. The locking of the locking device 3 to the locking device 2 can be released. Alternatively, when releasing the jib 25 moored to the tower 24 from the tower 24, the clutch 7 is de-energized, and the lock release lever 4 is moved from the lock allowable position to the lock release position by the rope 8. The locking of the locked device 3 to the locking device 2 can be released. In this way, the locked device 3 can be locked to the locking device 2 and the locking of the locked device 3 to the locking device 2 can be released by setting the clutch 7 in the non-excited state. Will also be possible. Therefore, it is possible to lock and unlock the jib 25 not only when the motor 6 (actuator) is operable but also when the motor 6 is inoperable. Further, since the motor 6 and the clutch 7 attached to the locking device 2 are smaller than the connecting body of Patent Document 1, the motor 6 and the clutch 7 that are lighter than the connecting body can be used. Further, since the clutch 5 is de-energized and the lock release lever 4 can be moved to the lock allowable position by the spring 5, it is not necessary to operate the rope 8 in the pushing direction. Therefore, the rope 8 does not need to have the same rigidity as that of the connected body of Patent Document 1. Therefore, it is possible to use the rope 8 that is lighter than the connected body. Therefore, the mass of the tower 24 can be reduced. Further, the motor 6 and the clutch 7 need not be removed once they are attached to the locking device 2. Furthermore, no assembly such as the connection is required for the rope 8. Therefore, the assemblability can be improved.
　また、ロック解除レバー４がロック許容位置に位置した際にタワークレーン２０の運転室２３から目視可能なように、タワー２４の軸方向と直交する方向に係止装置２から突出部４ａが突出している。作業者は、この突出部４ａを運転室２３から目視することで、ロック解除レバー４がロック許容位置に位置していること、すなわち、被係止装置３が係止装置２に係止されていることを確認することができる。 Further, when the lock release lever 4 is located at the lock allowable position, the projecting portion 4 a projects from the locking device 2 in a direction orthogonal to the axial direction of the tower 24 so that it can be seen from the operator's cab 23 of the tower crane 20. There is. The operator visually confirms the protruding portion 4a from the operator's cab 23 to confirm that the lock release lever 4 is located at the lock allowable position, that is, the locked device 3 is locked by the locking device 2. Can be confirmed.
　また、本実施形態では、コントローラ１１の駆動制御部が、リミットスイッチ９，１０の検出結果によるロック解除レバー４の位置に基づいて、モータ６の駆動および停止を制御する。これにより、ロック解除レバー４がロック許容位置にあるときにモータ６を駆動させ、ロック解除レバー４がロック解除位置に位置した際にモータ６を停止させることができる。 Further, in the present embodiment, the drive control unit of the controller 11 controls the drive and stop of the motor 6 based on the position of the lock release lever 4 based on the detection results of the limit switches 9 and 10. Thus, the motor 6 can be driven when the lock release lever 4 is in the lock allowance position, and the motor 6 can be stopped when the lock release lever 4 is in the lock release position.
［第２実施形態］
　次に、本発明の第２実施形態のジブ係留装置１０１について、図面を参照しつつ説明する。なお、第１実施形態と共通する構成およびそれにより奏される効果については説明を省略し、主に、第１実施形態と異なる点（係止装置の構成等）について説明する。なお、第１実施形態と同じ部材については、第１実施形態と同じ符号を付している。 [Second Embodiment]
Next, a jib mooring device 101 according to a second embodiment of the present invention will be described with reference to the drawings. It should be noted that the description of the configuration common to the first embodiment and the effect produced by the same is omitted, and mainly the points different from the first embodiment (the configuration of the locking device) will be described. The same members as those in the first embodiment are designated by the same reference numerals as those in the first embodiment.
　図６～９は、本実施形態に係るジブ係留装置１０１の図２のＢ－Ｂ断面図に相当する図である。本実施形態のジブ係留装置１０１は、係止装置２の代わりに係止装置１０２を有している。係止装置１０２は、ラッチ７１と、ラッチ支持ブラケット７３（ブラケット、支持部材）と、を有する。このラッチ７１が、被係止装置３の係止軸６１を係止する係止位置（図６に示す位置）と、係止軸６１の係止を解除する解除位置（図７に示す位置）との間で移動することによって、ジブ２５のロックおよびロック解除を実現することができる。 6 to 9 are views corresponding to the BB cross-sectional view of FIG. 2 of the jib mooring device 101 according to the present embodiment. The jib mooring device 101 of the present embodiment has a locking device 102 instead of the locking device 2. The locking device 102 includes a latch 71 and a latch support bracket 73 (bracket, support member). The latch 71 locks the locking shaft 61 of the locked device 3 (position shown in FIG. 6) and unlocks the locking shaft 61 (position shown in FIG. 7). By moving between and, the jib 25 can be locked and unlocked.
　タワー側ブラケット７２に取り付けられたラッチ支持ブラケット７３には、ラッチ７１が支点ピン７３ａを介して回動可能に連結されている。ラッチ７１は、下方に突出した爪７１ａを有する。ラッチ７１における爪７１ａよりもラッチ支持ブラケット７３側には、係止軸６１が係合可能な係合溝７１ｂが形成されている。また、ラッチ７１における爪７１ａに対して係合溝７１ｂとは反対側には、上方から下方に向かってラッチ支持ブラケット７３側に（係合溝７１ｂに近づくように）傾斜した傾斜面７１ｃが形成されている。 The latch 71 is rotatably connected to the latch support bracket 73 attached to the tower side bracket 72 via a fulcrum pin 73a. The latch 71 has a claw 71a protruding downward. An engagement groove 71b with which the locking shaft 61 can be engaged is formed on the latch 71 on the latch support bracket 73 side of the claw 71a. Further, on the side opposite to the engaging groove 71b with respect to the claw 71a in the latch 71, an inclined surface 71c inclined from the upper side to the lower side toward the latch support bracket 73 (to approach the engaging groove 71b) is formed. Has been done.
　ラッチ７１は、係止軸６１が係合溝７１ｂに係合する係止位置と、係止軸６１が係合溝７１ｂから外れた解除位置との間で移動可能（回動可能）である。 The latch 71 is movable (rotatable) between a locking position where the locking shaft 61 engages with the engagement groove 71b and a release position where the locking shaft 61 is disengaged from the engagement groove 71b.
　ラッチ７１のうち支点ピン７３ａよりも下側の部分とラッチ支持ブラケット７３との間には、スプリング７４が介装されている。ラッチ７１は、スプリング７４によって係止位置に配置されるように付勢されている。 A spring 74 is interposed between the latch support bracket 73 and a portion of the latch 71 below the fulcrum pin 73a. The latch 71 is urged by a spring 74 so as to be located at the locking position.
　ラッチ７１におけるラッチ支持ブラケット７３とは反対側の先端部は、ロープ７５を介してロック解除レバー４が連結されている。ロック解除レバー４のうち当該ロープ７５の接続先は、図３のロックピン５１が支持される部分と同様の位置である。 The tip of the latch 71 on the opposite side of the latch support bracket 73 is connected to the lock release lever 4 via a rope 75. The connection destination of the rope 75 of the lock release lever 4 is the same position as the portion where the lock pin 51 of FIG. 3 is supported.
　次に、ジブ係留装置１０１の動作について説明する。 Next, the operation of the jib mooring device 101 will be described.
　図６に示すように、係止位置にあるラッチ７１の係合溝７１ｂに係止軸６１が係合することで、ジブ２５がタワー２４の前面部にロックされる。ジブ２５がロック状態であることは、第１実施形態と同様に運転室２３に設けられたモニタランプにより作業者に報知される。また、運転室２３からロック解除レバー４の突出部４ａ（図３）を目視することができる。この状態において、クラッチ７（図３参照）は非励磁状態にされている。 As shown in FIG. 6, the jib 25 is locked to the front surface of the tower 24 by the engagement of the engagement shaft 71 with the engagement groove 71b of the latch 71 at the engagement position. The operator is informed that the jib 25 is in the locked state by a monitor lamp provided in the operator's cab 23 as in the first embodiment. Further, the protruding portion 4a (FIG. 3) of the lock release lever 4 can be visually observed from the operator's cab 23. In this state, the clutch 7 (see FIG. 3) is in the non-excited state.
　ジブ２５のロックを解除する場合には、作業者が運転室２３の操作スイッチをオンにする。すると、コントローラ１１により、クラッチ７が励磁状態にされ、モータ６が回転される。モータ６の回転をクラッチ７が伝達することで、ロック解除レバー４がロック許容位置からロック解除位置に移動する（図３の矢印Ｄ１）。 When unlocking the jib 25, the operator turns on the operation switch in the cab 23. Then, the controller 7 causes the clutch 7 to be in an excited state and the motor 6 is rotated. When the clutch 7 transmits the rotation of the motor 6, the lock release lever 4 moves from the lock allowance position to the lock release position (arrow D1 in FIG. 3).
　この結果、図７に示すように、ラッチ７１の先端側がロープ７５によって引き上げられ、係止軸６１の係止状態が解除される。このとき、作業者がジブ２５をタワー２４から前方に振り出すように起伏操作することで、ジブ２５のロックが解除される。ロック解除レバー４がロック解除位置に移動したことをリミットスイッチ９が検知すると、コントローラ１１により、クラッチ７が非励磁状態に切り替えられ、モータ６の回転が停止される。ジブ２５のロックが解除されたことをリミットスイッチ９が検知したことは、運転室２３に設けられたモニタランプにより作業者に報知される。 As a result, as shown in FIG. 7, the tip end side of the latch 71 is pulled up by the rope 75, and the locked state of the locking shaft 61 is released. At this time, the worker performs a hoisting operation to swing the jib 25 forward from the tower 24, whereby the lock of the jib 25 is released. When the limit switch 9 detects that the lock release lever 4 has moved to the lock release position, the controller 11 switches the clutch 7 to the non-excitation state, and the rotation of the motor 6 is stopped. The operator is notified by a monitor lamp provided in the cab 23 that the limit switch 9 detects that the lock of the jib 25 has been released.
　クラッチ７が非励磁状態に切り替えられると、スプリング５の付勢力で、ロック解除レバー４がロック許容位置に移動する（図３の矢印Ｄ２）。また、図８に示すように、スプリング７４の付勢力で、ラッチ７１が係止位置に移動する。 When the clutch 7 is switched to the non-excited state, the urging force of the spring 5 moves the lock release lever 4 to the lock allowable position (arrow D2 in FIG. 3). Further, as shown in FIG. 8, the biasing force of the spring 74 moves the latch 71 to the locking position.
　ジブ２５をロックする場合には、図８に示す状態において、ジブ２５をタワー２４の前面に向かって折り畳む。このとき、クラッチ７は非励磁状態である。ジブ２５を折り畳むと、図９に示すように、係止軸６１がラッチ７１の傾斜面７１ｃに当接し、傾斜面７１ｃに沿って摺動することで、スプリング７４の付勢力に抗してラッチ７１を解除位置に向かって回動させる。そして、係止軸６１が爪７１ａを乗り越えると、図６に示すように、係止軸６１が係合溝７１ｂに係合し、ジブ２５がタワー２４にロックされる。リミットスイッチ１０は、ロック解除レバー４がロック許容位置に移動したことを検知する。ジブ２５がロックされたことをリミットスイッチ１０が検知したことは、運転室２３に設けられたモニタランプにより作業者に報知される。また、運転室２３からロック解除レバー４の突出部４ａを目視することができる。 When locking the jib 25, fold the jib 25 toward the front of the tower 24 in the state shown in FIG. At this time, the clutch 7 is in a non-excited state. When the jib 25 is folded, as shown in FIG. 9, the locking shaft 61 abuts the inclined surface 71c of the latch 71 and slides along the inclined surface 71c, thereby resisting the biasing force of the spring 74. 71 is rotated toward the release position. Then, when the locking shaft 61 gets over the claw 71a, the locking shaft 61 engages with the engaging groove 71b and the jib 25 is locked to the tower 24, as shown in FIG. The limit switch 10 detects that the lock release lever 4 has moved to the lock allowable position. The fact that the limit switch 10 has detected that the jib 25 has been locked is notified to the operator by a monitor lamp provided in the cab 23. Further, the protruding portion 4a of the lock release lever 4 can be seen from the operator's cab 23.
　なお、ジブ２５のロック状態において、図３に示すように、ロープ８を作業者が引っ張ることで、スプリング５の付勢力に抗してロック解除レバー４をロック許容位置からロック解除位置に移動させることができる。これにより、モータ６の動力によらずに、被係止装置３の係止装置２への係止を解除することができる。 In the locked state of the jib 25, an operator pulls the rope 8 to move the lock release lever 4 from the lock allowance position to the lock release position against the urging force of the spring 5, as shown in FIG. be able to. As a result, the locking of the locked device 3 with the locking device 2 can be released regardless of the power of the motor 6.
　本実施形態によれば、第１実施形態と同様の効果を奏する。なお、本実施形態に係るロープ７５に代えて、剛体からなる連結棒などが配置されてもよい。 According to this embodiment, the same effect as that of the first embodiment is obtained. Instead of the rope 75 according to the present embodiment, a rigid connecting rod or the like may be arranged.
　以上、本発明の実施形態を説明したが、具体例を例示したに過ぎず、特に本発明を限定するものではなく、具体的構成などは、適宜設計変更可能である。また、発明の実施の形態に記載された、作用及び効果は、本発明から生じる最も好適な作用及び効果を列挙したに過ぎず、本発明による作用及び効果は、本発明の実施の形態に記載されたものに限定されるものではない。 Although the embodiment of the present invention has been described above, it merely exemplifies a specific example and does not particularly limit the present invention, and a specific configuration and the like can be appropriately modified in design. Further, the actions and effects described in the embodiments of the invention only list the most suitable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what has been done.
　以上、本発明によって提供されるのは、ブームと前記ブームの先端部に起伏可能に取り付けられたジブであって前記ブームに対して折り畳まれることが可能なジブとを有するクレーンに備えられ、前記ジブを前記ブームに係留することが可能なジブ係留装置である。当該ジブ係留装置は、前記ブームに設けられた係止部と、前記ジブに設けられ、前記ブームに対して前記ジブが折り畳まれた際に、前記係止部によって係止されることが可能な被係止部と、ロック許容位置とロック解除位置との間で移動可能とされ前記係止部による前記被係止部の係止状態を切り換えることが可能なロック切換部材であって、前記ロック許容位置に配置されると前記係止部が前記被係止部を係止することを許容し、前記ロック解除位置に配置されると前記係止部による前記被係止部の係止を解除する、ロック切換部材と、前記ロック切換部材が前記ロック許容位置に配置されるように前記ロック切換部材を付勢する付勢部と、前記係止部に取り付けられ、前記付勢部の付勢力に抗して前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させることが可能な駆動部と、前記係止部に取り付けられ、励磁状態のときに前記駆動部の動力が前記ロック切換部材に伝達されることを許容する一方、非励磁状態のときに前記駆動部の動力が前記ロック切換部材に伝達されることを阻止する動力伝達機構と、前記ロック切換部材に連結され、前記動力伝達機構が前記非励磁状態のときに作業者によって引っ張られることで、前記付勢部の付勢力に抗して前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させることが可能な引張部材と、を備える。 As described above, what is provided by the present invention is provided in a crane having a boom and a jib that is movably attached to a tip portion of the boom and that can be folded with respect to the boom. A jib mooring device capable of mooring a jib to the boom. The jib mooring device is provided on the boom and the jib, and can be locked by the locking part when the jib is folded with respect to the boom. A lock switching member that is movable between a locked portion and a lock allowable position and an unlocked position and that can switch the locked state of the locked portion by the locking portion, the lock switching member comprising: The locking portion allows the locked portion to lock the locked portion when placed in the allowance position, and unlocks the locked portion by the locking portion when placed in the lock release position. A lock switching member, a biasing portion that biases the lock switching member so that the lock switching member is located at the lock allowable position, and a biasing force of the biasing portion that is attached to the locking portion. And a drive unit capable of moving the lock switching member from the lock allowable position to the lock release position against the lock, and the power of the drive unit is locked to the lock unit when attached to the locking unit. A power transmission mechanism that allows transmission to the switching member while preventing transmission of power of the drive unit to the lock switching member in a non-excited state; and a power transmission mechanism connected to the lock switching member, It is possible to move the lock switching member from the lock allowing position to the lock releasing position against the biasing force of the biasing portion by being pulled by the worker when the power transmission mechanism is in the non-excited state. A tension member.
　上記の構成において、前記動力伝達機構を前記励磁状態と前記非励磁状態との間で切り換え可能な伝達制御部を更に備え、前記伝達制御部は、前記ブームに対して折り畳まれた状態の前記ジブを前記ブームに係留するために、前記動力伝達機構を非励磁状態にして、前記付勢部の付勢力によって前記ロック切換部材を前記ロック解除位置から前記ロック許容位置に移動させることで、前記係止部によって前記被係止部を係止する一方、前記ブームに係留された前記ジブを前記ブームから解放するために、前記動力伝達機構を励磁状態にして、前記駆動部の動力によって前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させる、または、前記動力伝達機構を非励磁状態にして、前記引張部材によって前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させることで、前記係止部による前記被係止部の係止を解除することが望ましい。 In the above configuration, the power transmission mechanism may further include a transmission control unit capable of switching between the excited state and the non-excited state, the transmission control unit including the jib in a state of being folded with respect to the boom. In order to moorize the boom with the boom, the power transmission mechanism is de-energized, and the lock switching member is moved from the unlocked position to the lock allowing position by the urging force of the urging portion. While locking the locked portion by the stop portion, in order to release the jib moored on the boom from the boom, the power transmission mechanism is set in an excited state, and the lock switching is performed by the power of the drive portion. Moving the member from the lock permitting position to the lock releasing position, or deactivating the power transmission mechanism to move the lock switching member from the lock permitting position to the lock releasing position by the tension member. Then, it is desirable to release the locking of the locked portion by the locking portion.
　上記の構成において、前記ロック切換部材は、当該ロック切換部材が前記ロック許容位置に配置されると前記クレーンの運転室から作業者が目視可能なように、前記ブームの軸方向と直交する方向において前記係止部から突出する突出部を有していることが望ましい。 In the above configuration, the lock switching member is arranged in a direction orthogonal to the axial direction of the boom so that a worker can visually recognize the lock switching member from the cab of the crane when the lock switching member is arranged at the lock allowable position. It is desirable to have a protruding portion protruding from the locking portion.
　上記の構成において、少なくとも前記ロック切換部材が前記ロック許容位置から前記ロック解除位置に移動したことを検出することが可能な検出部と、前記検出部の検出結果に基づいて、前記駆動部の駆動および停止を制御することが可能な駆動制御部と、を更に備えることが望ましい。 In the above configuration, at least the detection unit capable of detecting that the lock switching member has moved from the lock allowance position to the lock release position, and the drive of the drive unit based on the detection result of the detection unit. And a drive control unit capable of controlling stop.

Claims (4)

  1. 　ブームと前記ブームの先端部に起伏可能に取り付けられたジブであって前記ブームに対して折り畳まれることが可能なジブとを有するクレーンに備えられ、前記ジブを前記ブームに係留することが可能なジブ係留装置であって、
    　前記ブームに設けられた係止部と、
    　前記ジブに設けられ、前記ブームに対して前記ジブが折り畳まれた際に、前記係止部によって係止されることが可能な被係止部と、
    　ロック許容位置とロック解除位置との間で移動可能とされ前記係止部による前記被係止部の係止状態を切り換えることが可能なロック切換部材であって、前記ロック許容位置に配置されると前記係止部が前記被係止部を係止することを許容し、前記ロック解除位置に配置されると前記係止部による前記被係止部の係止を解除する、ロック切換部材と、
    　前記ロック切換部材が前記ロック許容位置に配置されるように前記ロック切換部材を付勢する付勢部と、
    　前記係止部に取り付けられ、前記付勢部の付勢力に抗して前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させることが可能な駆動部と、
    　前記係止部に取り付けられ、励磁状態のときに前記駆動部の動力が前記ロック切換部材に伝達されることを許容する一方、非励磁状態のときに前記駆動部の動力が前記ロック切換部材に伝達されることを阻止する動力伝達機構と、
    　前記ロック切換部材に連結され、前記動力伝達機構が前記非励磁状態のときに作業者によって引っ張られることで、前記付勢部の付勢力に抗して前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させることが可能な引張部材と、
    を備える、ジブ係留装置。     It is provided in a crane having a boom and a jib which is attached to the tip of the boom so as to be capable of undulating and is capable of being folded with respect to the boom, and the jib can be moored to the boom. A jib mooring device,
    A locking portion provided on the boom,
    A locked portion provided on the jib, which can be locked by the locking portion when the jib is folded with respect to the boom;
    A lock switching member that is movable between a lock allowable position and an unlock position and is capable of switching the locked state of the locked part by the locking part, and is arranged at the lock allowable position. And a lock switching member that allows the locking portion to lock the locked portion, and releases the locking of the locked portion by the locking portion when the locking portion is arranged at the lock release position. ,
    A biasing portion that biases the lock switching member so that the lock switching member is arranged at the lock allowable position;
    A drive unit that is attached to the locking unit and that can move the lock switching member from the lock allowing position to the lock releasing position against the biasing force of the biasing unit;
    It is attached to the locking portion and allows the power of the drive portion to be transmitted to the lock switching member when in the excited state, while the power of the drive portion is transmitted to the lock switching member when in the non-excited state. A power transmission mechanism for preventing transmission,
    When the power transmission mechanism is coupled to the lock switching member and is pulled by an operator when the power transmission mechanism is in the non-excited state, the lock switching member is moved from the lock allowing position to the urging force of the urging portion. A tension member that can be moved to the unlocked position,
    Jib mooring device.
  2. 　前記動力伝達機構を前記励磁状態と前記非励磁状態との間で切り換え可能な伝達制御部を更に備え、
    　前記伝達制御部は、
    　　前記ブームに対して折り畳まれた状態の前記ジブを前記ブームに係留するために、前記動力伝達機構を非励磁状態にして、前記付勢部の付勢力によって前記ロック切換部材を前記ロック解除位置から前記ロック許容位置に移動させることで、前記係止部によって前記被係止部を係止する一方、
    　　前記ブームに係留された前記ジブを前記ブームから解放するために、前記動力伝達機構を励磁状態にして、前記駆動部の動力によって前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させる、または、前記動力伝達機構を非励磁状態にして、前記引張部材によって前記ロック切換部材を前記ロック許容位置から前記ロック解除位置に移動させることで、前記係止部による前記被係止部の係止を解除する、請求項１に記載のジブ係留装置。     Further comprising a transmission control unit capable of switching the power transmission mechanism between the excited state and the non-excited state,
    The transmission control unit,
    In order to moor the jib folded with respect to the boom to the boom, the power transmission mechanism is de-energized, and the lock switching member is moved from the unlocked position by the urging force of the urging portion. By moving the locked portion by the locking portion, while locking the locked portion,
    In order to release the jib moored to the boom from the boom, the power transmission mechanism is in an excited state, and the power of the drive unit moves the lock switching member from the lock allowing position to the lock releasing position. Alternatively, by making the power transmission mechanism in a non-excited state and moving the lock switching member from the lock permissible position to the lock release position by the pulling member, the engagement of the locked portion by the locking portion. The jib mooring device of claim 1, which is unlocked.
  3. 　前記ロック切換部材は、当該ロック切換部材が前記ロック許容位置に配置されると前記クレーンの運転室から作業者が目視可能なように、前記ブームの軸方向と直交する方向において前記係止部から突出する突出部を有している、請求項１または２に記載のジブ係留装置。 When the lock switching member is arranged at the lock permissible position, the lock switching member can be seen from the operator's cab of the crane in a direction orthogonal to the axial direction of the boom from the locking portion. The jib mooring device according to claim 1 or 2, further comprising a protruding portion.
  4. 　少なくとも前記ロック切換部材が前記ロック許容位置から前記ロック解除位置に移動したことを検出することが可能な検出部と、
    　前記検出部の検出結果に基づいて、前記駆動部の駆動および停止を制御することが可能な駆動制御部と、
    を更に備える、請求項１乃至３のいずれか１項に記載のジブ係留装置。     At least a detection unit capable of detecting that the lock switching member has moved from the lock permission position to the lock release position,
    A drive control unit capable of controlling drive and stop of the drive unit based on a detection result of the detection unit;
    The jib mooring device according to any one of claims 1 to 3, further comprising:
PCT/JP2019/049061 2018-12-21 2019-12-13 Jib anchoring device WO2020129864A1 (en)

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CN112141912A (en) * 2020-09-02 2020-12-29 中联重科股份有限公司 Pull plate assembly, crane boom and crane

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CN112141912B (en) * 2020-09-02 2022-01-07 中联重科股份有限公司 Pull plate assembly, crane boom and crane

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