JP6150486B2 - Grab dredger - Google Patents

Description

  The present invention relates to a grab dredger work ship in which a grab bucket and a weight of a work ship are connected by a wire rope, and the grab bucket is lifted and lowered by utilizing a balance with the weight, and its lift drive energy is reduced. , Equipped with a mechanism that intermittently connects the grab bucket and weight of the work ship with a clutch, when grabbing the earth and sand with the grab bucket and scooping it up, the energy consumption can be reduced using the balance with the weight, The present invention relates to a grab dredger working vessel that allows a rock rock to be broken by free-falling a broken rock bar attached by exchanging the grab bucket when separated by a clutch.

The lifting device of a grab dredging vessel equipped with a hydraulic or wire rope grab bucket frequently raises a huge amount of weight, including dredged sand and grab bucket weight (a large grab bucket would be several hundred tons). It is necessary and its driving energy is enormous.
Conventionally, as a countermeasure, a labor-saving system has been proposed in which a weight that cancels the weight of the grab bucket is moved up and down via a wire rope, a pulley or the like. In fact, some dredgers use this system (driving mechanism is a hydraulic cylinder) for dredging. Currently, the following patents and utility models have been filed as improvement measures for labor saving.

Shoko 60-53141 Fairness 03-12839 Reality 63-81965 JP 08-245179

However, although the weight system proposed so far has a difference in driving method (electric drum type or hydraulic cylinder type, etc.), the structure is connected from the grab bucket to the weight with the same wire rope. The following issues are listed.
(1) Cannot be crushed with a crushed rock stick.
In conventional dredging work, there is a case where hard ground dredging that cannot be dredged with a grab bucket is performed. In this case, the rock breaking rod is attached to the crane instead of the grab bucket, the rock breaking rod is dropped freely and the bedrock is broken, and then the rock breaking rod is replaced and the broken rock bed is removed with the reattached grab bucket. . However, with the current weight method, the rock bar cannot be dropped freely. This is because the crushed rock and the weight are connected by the same wire rope. In addition, since the weight becomes heavier than the weight of the rock breaking rod, useless energy is consumed even if the rock breaking rod is lowered at a high speed instead of falling by its own weight. In other words, since the rock breaking rod is connected to one end of the same wire rope and the weight is connected to the other end, in order to descend the rock breaking rod at a high speed, it is necessary to raise the weight that is heavier than this, This is because wasteful energy is consumed.
(2) When the grab bucket is not suspended, such as when changing the grab bucket, the weight of the weight that is originally balanced with the grab bucket is lost through the wire rope, and the entire weight of the weight is loaded, so much energy is consumed. Resulting in.

  The present invention has been devised in view of the problems as described above, and has been devised to solve the problems. The object of the present invention is to provide a mechanism for connecting and disconnecting a grab bucket and a weight of a work ship with a clutch. When grabbing soil and rocks with a grab bucket, and scooping it up and lifting it, the energy consumption can be reduced by using the balance with the weight, and when it is separated with a clutch, the rock breaking rod attached by replacing the grab bucket is free The purpose is to provide a grab dredger that can be dropped to break the bedrock.

In order to achieve the above-described problems, the present invention relates to the other end of a wire rod rope on the side of a bucket crushed rod on which a grab bucket or a crushed rock rod is connected to one end of the crane jib provided on a work boat. The side is connected to the bucket rock lifting rod lifting drum arranged on the work ship and wound, and the bucket rock lifting rod lifting drum and the electric motor which is the driving source of the drum are connected via the bucket rock rod stick clutch The other end of the weight side wire rope connected to one of the weights that can be moved up and down on the work ship is connected to a weight lifting drum arranged on the work ship and wound. together interlockingly connected the weight lift drums and the bucket rocks rod lift drum through the weight-side clutch that intermittently both, through the weight lift drums and the weight-side clutch And the bucket drilling rod lifting drum that pivotal coupling is made from intermittent freely and with means through the bucket drilling rod side clutch operatively connected between said electric motor.

  According to the grab dredger working vessel according to the present invention comprising means for solving the problems, when using the grab bucket, the bucket crushed bar side clutch and the weight side clutch are brought into the connected state, and the grab bucket and the weight are connected. However, by using the balance between the two, it is possible to reduce the driving energy for raising and lowering the grab bucket, and when using a rock breaking bar, the weight side clutch is released to release the weight breaking clutch. Is not connected to prevent natural fall of the crushed rock rod due to the weight, and the bucket crushed rod side clutch is disengaged to disconnect the crushed rock rod from the electric motor, In addition, it is possible to secure the fall, and by connecting the bucket crushed rock side clutch, the ground crushed rock connected to the electric motor can be used to drive the motor. Etc. can be pulled by rise, it is intended to achieve the very new benefit Naru effects.

1 is an overall schematic side view showing an embodiment for carrying out the present invention. It is a front view of the weight which shows the form for implementing this invention. It is a top view inside the winch chamber which shows the form for implementing this invention. FIG.

  Hereinafter, the present invention will be described more specifically based on embodiments for carrying out the invention described in the drawings.

  In the figure, the grab bucket 1 is used for scooping up soil and rocks while crushing the bottom of the seabed or water bottom during dredging work. Further, the rock breaking bar 2 attached in place of the grab bucket 1 is used when cracking a hard rock that cannot be broken by the grab bucket 1.

  The grab bucket 1 and the rock breaking bar 2 are intermittently connected by the weight 7 and the clutches 5 and 6. When grabbing the sand and rocks by the bucket 1 and scooping it up and rising, the grab bucket 1 and the rock breaking bar 2 are connected by the clutches 5 and 6. The energy consumption can be reduced using the balance between When cracking a hard rock mass, the weights 5 and 6 are separated from the weight 7 and the rock rock rod 2 attached in place of the grab bucket 1 can be dropped freely to break the rock mass.

  For example, a hydraulic grab bucket is used for the grab bucket 1, and is supported by a main body block 11 including a hydraulic unit, a hydraulic oil tank chamber, an oil cooler, and the like, which are not shown, and a lower part of the main body block 11 so as to be freely opened and closed. And a pair of bucket shells 12.

  The main body block 11 constituting the upper side of the grab bucket 1 is constituted by a strong steel structure, and a hanging metal fitting 13 is attached above the main body block 11. One end side of the bucket crushed rod side wire rope 14 is suspended from the upper side and wound around the hanging metal fitting 13. The upper side of one end of the bucket rock breaking rod side wire rope 14 is suspended from the front side of a swivel 31 installed on the work boat 3 at the tip side of a crane jib 32 whose lower part is vertically tiltable. ing.

  In other words, the grab bucket 1 is suspended by the above-described bucket crushed rod side wire rope 14 suspended on the tip end side of the crane jib 32 of the work ship 3 through the suspension fitting 13 of the main body block 11, and the fork crane jib 32 is attached. As the swivel base 31 turns on the work boat 3, it can turn around the work boat 3.

  The pair of bucket shells 12 opens and closes downward from the left and right about the left and right axes, and the ends of the pair of left and right bucket shells 12 cross and close at the lower center of the main body block 11. Claws are alternately formed at the intersecting tips of the left and right bucket shells 12, and the left and right bucket shells 12 are closed with the claws alternately intersecting.

  The pair of bucket shells 12 are opened and closed by expanding and contracting a hydraulic cylinder (not shown). The hydraulic cylinder is activated by the hydraulic unit and is expanded and contracted by the hydraulic oil from the hydraulic oil tank chamber. One end of the composite cable 15 is connected to a hydraulic unit (not shown) and is controlled by the hydraulic pressure sent through the composite cable 15.

  The rock breaking rod 2 attached in place of the grab bucket 1 has a warhead-like shape, and the tip side on the lower side is pointed. Further, a hanging tool 21 is formed on the upper side. As in the case of the grab bucket 1, one end side of the bucket rock breaking rod side wire rope 14 is attached to the lifting tool 21 of the rock breaking rod 2. The upper side of one end of the bucket rock breaking rod side wire rope 14 is suspended from the front side of a swivel 31 installed on the work boat 3 at the tip side of a crane jib 32 whose lower part is vertically tiltable. ing.

  That is, the rock breaking rod 2 attached in place of the grab bucket 1 is the bucket breaking rod suspended from the top end of the crane jib 32 of the work ship 3 via the upper suspension 21 as in the case of the grab bucket 1. A swivel 31, which is suspended by the side wire rope 14 and to which the fork crane jib 32 is attached, swivels on the work ship 3 so that it can turn around the work ship 3.

  The swivel base 31 installed on the work ship 3 turns in the horizontal direction on the ship. On the swivel 31 that swivels in the horizontal direction, an electric chamber and a swivel drive chamber 33 are provided. A winch chamber 4 and an operation chamber 34 are provided above the electric chamber and the swivel drive chamber 33. The operation chamber 34 is provided in a state of overhanging the front upper side of the swivel base 31 on the same side as the side on which the crane jib 32 is attached.

  In the winch chamber 4, a bucket rock bar lifting drum 41 is disposed, and on both sides thereof, a bucket rock bar side clutch 5, a motor side drive gear 43 c, a motor side driven gear 43 b, a speed reducer 43 d, an electric motor 43 and the like are respectively provided. They are arranged in pairs. In addition, a weight lifting drum 44 that is linked to these is disposed on the rear side of the bucket crushed rock lifting drum 41, and a pair of weight side clutch 6 and weight side drive gear 44d are disposed on both sides thereof. Has been. Further, units composed of the above-described parts are respectively arranged in the front and rear.

  Each of the bucket rocking rod lifting drums 41 arranged at the front and rear raises and lowers the rock breaking rod 2 through the bucket rocking rod side wire rope 14 when the grab bucket 1 is replaced. Around the cylindrical drum of the drum 41 for raising and lowering the bucket crushed rock rod, the other end side of the wire rod 14 of the bucket crushed rock rod side connected at one end to the crushed rock rod 2 is connected and wound around the grab bucket 1 or at the time of replacement. And the drum 41 for bucket crushing rock raising / lowering forward / reverse rotation is carried out, and the other end side of the bucket rock crushing rod side wire rope 14 was wound around the trunk | cylinder, was rewound, and was connected with the one end side. When the grab bucket 1 is replaced, the rock breaking bar 2 is raised and lowered.

  The front and rear bucket crushed rock lifting / lowering drums 41 are arranged in a direction orthogonal to the crane jib 32 whose rotation center axis tilts up and down. A pair of left and right ring-shaped drum brake pieces 42a are respectively projected in the circumferential direction and attached to the vicinity of the center of the cylindrical drum circumference of the drum 41 for raising and lowering the bucket rock breaking rod. Drum brakes 42 are provided in contact with the protruding ring-shaped drum brake pieces 42a to stop the rotation of the bucket rocking rod lifting drum 41 when the rockfalling rods that have fallen freely fall. For example, the drum brake 42 is disposed on the front side of the drum 41 for raising and lowering the bucket crushed rock bar.

  Bucket crushed bar side drive gears 41a are respectively attached to both ends of the cylindrical drum periphery of the bucket crushed rock lifting drum 41. Bucket crushed rock raising / lowering drum rotation shafts 41b are attached to the rotation center portions of the bucket crushed rock raising / lowering drum 41 and the bucket crushed rock side drive gear 41a symmetrically toward the outer side. The left and right bucket rocking rod lifting / lowering drum rotating shafts 41b are pivotally supported by bucket bucket rocking rod lifting / lowering drum bearings 41c disposed on the left and right sides of the bucket breaking rock lifting / lowering drum 41 so as to be rotatable forward and backward.

  At each end of the left and right bucket rocking rod lifting and lowering drum rotating shaft 41b, a bucket rocking rod side clutch 5 to be connected and released is provided. A motor-side rotating shaft 43 a that is interlocked and connected to the electric motor 43 is provided across the bucket crushed bar-side clutch 5. The bucket crushed rod side clutch 5 fulfills the function of connecting and releasing the bucket crushed rod lifting drum rotating shaft 41b and the motor side rotating shaft 43a.

  In other words, when the bucket crushed bar side clutch 5 is connected, the driving force of the electric motor 43 is transmitted to the bucket crushed rock lifting / lowering drum rotation shaft 41b through the motor side rotating shaft 43a, and the bucket crushed rock lifting / lowering drum 41 or weight lifting / lowering is performed. The drum 44 for driving is driven and stopped. When the bucket crushed rod side clutch 5 is released, the bucket crushed rod lifting / lowering drum rotating shaft 41b and the motor side rotating shaft 43a are separated from each other, and the load acting on the bucket crushed rock raising / lowering drum 41 is driven through the motor side rotating shaft 43a. 43 is not transmitted.

  A motor-side driven gear 43b is attached to each of the left and right motor-side rotation shafts 43a. Each motor-side rotation shaft 43a passes through the rotation center of the motor-side driven gear 43b. The motor-side driven gear 43b is provided with a motor-side drive gear 43c that meshes therewith. The motor side driving gear 43c has a smaller number of teeth than the motor side driven gear 43b and is configured to transmit a large force.

  The drive shaft of the motor side drive gear 43c is linked to the speed reducer 43d. The speed reducer 43d reduces the rotational speed of the electric motor 43 to generate a large force and transmits it to the bucket crushed rock lifting drum 41 side. The reduction gear 43d is provided with a braking brake 43e that functions when the grab bucket 1 is used.

  The electric motor 43 rotationally drives the bucket rocking rod lifting / lowering drum 41 via the reduction gear 43d, the motor side driving gear 43c, the motor side driven gear 43b, the bucket rocking rod lifting / lowering drum rotating shaft 41b, etc. It is a drive source for raising and lowering the grab bucket 1 attached to one end of the wire rope 14 or the rock breaking bar 2 attached instead.

  The weight lifting drums 44 disposed on the rear side of the front and rear bucket rocking rod lifting drums 41 raise and lower the weight 7 through the weight-side wire rope 76, which will be described later. The other end side of the weight side wire rope 76 having one end connected to the weight 7 is connected and wound around the cylindrical body of the weight lifting drum 44. Then, when the weight lifting drum 44 rotates forward and backward, the other end side of the weight side wire rope 76 is wound around or unwound around the trunk, and the weight connected to the one end side. 7 is raised and lowered. Each weight lifting drum 44 is arranged such that its rotation center axis is parallel to the rotation center axis of the bucket crushed rock lifting drum 41 on the front side.

  At the cylindrical rotation center of the weight lifting drum 44, a weight lifting drum rotating shaft 44a is attached symmetrically toward the outer side. The left and right weight lifting / lowering drum rotating shafts 44a are respectively pivotally supported by weight lifting / lowering drum bearings 44b disposed on the left and right sides of the weight lifting / lowering drum 44 so as to be rotatable forward and backward.

  A weight-side clutch 6 to be connected and released is provided at each end of the left and right weight lifting / lowering drum rotating shafts 44a. Opposite the weight-side clutches 6, weight-side rotating shafts 44 c that are interlocked and connected to the bucket rock raising / lowering drum 41 are provided. The weight side clutch 6 functions to connect and release the weight lifting drum rotating shaft 44a and the weight side rotating shaft 44c.

  A weight-side drive gear 44d is attached to each of the left and right weight-side rotation shafts 44c. Each weight-side rotation shaft 44c passes through the rotation center of the weight-side drive gear 44d. The weight-side drive gear 44d is attached so as to mesh with the bucket rock-clamping rod-side drive gear 41a at the end of the bucket rock-climbing rod lifting / lowering drum 41. The weight side drive gear 44d has the same number of teeth as the bucket crushed rock side drive gear 41a, and can rotate at the same angular velocity.

  When the weight side clutch 6 is in the connected state, the weight lifting drum 44 is linked to the bucket rocking rod lifting drum 41 through the bucket rocking rod side driving gear 41a and the weight side driving gear 44d. When the lifting / lowering drum 41 rotates, the weight lifting / lowering drum 44 also rotates in conjunction with it, and when the bucket crushed bar lifting / lowering drum 41 stops rotating, the weight lifting / lowering drum 44 also stops. In addition, when the weight side clutch 6 is in the released state, the weight lifting drum 44 and the bucket rock bar lifting drum 41 are separated from each other, so that the rotational driving force is not transmitted from the bucket rock bar lifting drum 41, The weight lifting drum 44 is stopped.

  The weight 7 serves to reduce the lifting energy of the grab bucket 1 by the electric motor 43 through the balance of the weight with the grab bucket 1. The weight 7 is installed so as to rise when the grab bucket 1 descends and to descend when the grab bucket 1 rises. The weight 7 is installed on the swivel base 31 of the work boat 3 on the opposite side of the crane jib 32 with the winch chamber 4 interposed therebetween so as to be able to move up and down.

  The weight 7 installed on the swivel 31 has a groove shape at both lateral ends, and guide struts 71 are vertically provided in the groove shape. The weight 7 has a structure that moves up and down in a state where both end sides thereof are guided by the left and right guide columns 71. The lower ends of the left and right guide columns 71 are fixed to the swivel 31, and the upper ends of the left and right guide columns 71 are connected by an upper horizontal beam 72 and integrated. As compared with the left and right guide columns 71, the upper horizontal beam 72 protrudes forward and backward and is wider in the front and rear.

  A pair of left and right fixed pulleys 73 and 74 are fixed to the upper and lower surfaces of the upper horizontal girder 72 whose front and rear are wide. A pair of left and right movable pulleys 75 are fixed to the upper surface of the weight 7 positioned directly below the fixed pulleys 73 and 74. The movable pulley 75 moves up and down together with the lifting weight 7. A weight side wire rope 76 is wound around and stretched between the fixed pulleys 73 and 74 and the movable pulley 75.

  A weight-side wire rope 76 extending upward from the weight lifting drum 44 disposed in front of and behind the winch chamber 4 is inverted downward on the upper half side of the fixed pulley 73 and extends downward therefrom to extend the movable pulley 75. Inverted upward on the lower half side, extended upward, inverted downward again on the upper half side of the fixed pulley 73, and one end side extending downward is connected to the weight 7.

  On the upper side of the winch chamber 4 of the work boat 3, a wire rope 35 for raising and lowering the crane jib 32 is stretched. The leading end side of the hoisting operation bar 32a is pivotally supported on the upper end side of the crane jib 32 so as to be rotatable up and down, and one end side of the hoisting wire rope 35 is connected to the rear end side of the hoisting operation bar 32a.

  The hoisting wire rope 35 is reversed by the upper pulley attached to the upper side of the winch chamber 4 and the rear end pulley of the hoisting operation bar 32a, and then is attached to the upper side of the winch chamber 4. The other end of the hoisting winch 32b installed below is wound around the pulley. Then, when the hoisting winch 32b rotates forward and backward, the other end side of the hoisting wire rope 35 is wound or unwound by the winch 32b, and one end side thereof is connected via the hoisting operation bar 32a. The crane jib 32 thus made is tilted up and down.

  A cable reel 36 is attached to the front side of the upper part of the winch chamber 4 of the work boat 3. The cable reel 36 is wound around the other end of the composite cable 15 having one end connected to the grab bucket 1.

  Next, an operation based on the configuration of the embodiment for carrying out the invention will be described below. These operations are performed in the operation room 34.

  When grabbing sand and rocks with the grab bucket 1 and scooping it up, the bucket crushed bar side clutch 5 and the weight side clutch 6 are both connected, and the bucket crushed bar lifting drum 41 and the weight lifting drum 44 are Are connected to each other and the grab bucket 1 and the weight 7 are connected to each other. The grab bucket 1 that moves up and down is driven by an electric motor 43 that is a drive source for raising and lowering the grab bucket 1 due to the balance with the weight 7. Energy can be reduced.

  That is, when the electric motor 43 is driven in the direction in which the grab bucket 1 is raised, the rotational driving force of the electric motor 43 drives the motor side drive gear 43c to rotate through the speed reducer 43d. Since the motor-side driven gear 43b is meshed with the motor-side driven gear 43c that is rotationally driven and interlocked with the motor-side driven gear 43b, the motor-side driven gear 43b is also rotationally driven. When the motor side driven gear 43b is driven to rotate, the motor side rotating shaft 43a connected to the rotation center of the motor side driven gear 43b is also driven to rotate.

  The bucket rocking rod lifting / lowering drum rotating shaft 41b is linked and linked to the motor-side rotating shaft 43a that is driven to rotate via the connected bucket-cracking rod-side clutch 5, so that it rotates integrally. By rotating the bucket rocking rod lifting / lowering drum rotating shaft 41b, the bucket rocking rod lifting / lowering drum 41 also rotates around the trunk.

  The rotating bucket crushing rod lifting drum 41 is wound with the other end of the bucket crushing rod side wire rope 14 having one end connected to the grab bucket 1 connected thereto. For this reason, the other end side of the bucket rock breaking rod side wire rope 14 is wound around the bucket breaking rod lifting drum 41, whereby the grab bucket 1 grabbing the earth and sand is lifted and pulled up.

  At this time, the weight 7 is in balance with the grab bucket 1, and the weight 7 is lifted immediately before the grab bucket 1 rises. The weight 7 that is pulled up is connected to one end of a weight-side wire rope 76 that is wound around the body of the weight lifting drum 44 with the other end connected thereto. Due to the dead weight of the weight 7 pulled up through the weight side wire rope 76, a rotating torque acts on the weight lifting drum 44 in the direction of rewinding the weight lifting drum 44, and the weight lifting drum rotating shaft 44a is the same. A rotational torque works in the rotational direction.

  Since the weight side rotating shaft 44c is interlocked with the weight lifting drum rotating shaft 44a in which the rotational torque is exerted via the connected weight side clutch 6, the weight side rotating shaft 44c has the same rotational direction. Rotational torque works. Since the weight side rotating shaft 44c is connected to the rotation center of the weight side driving gear 44d, the rotating torque from the weight side rotating shaft 44c acts, and the weight side driving gear 44d receives a rotating force. work. The rotation direction acting on the weight side drive gear 44d is the same as the rotation direction rotating in the direction of raising the grab bucket 1 of the bucket crushed rod side drive gear 41a meshing with the weight side drive gear 44d.

  Thus, since force acts in the direction which raises the grab bucket 1 by the dead weight of the weight 7, the drive energy of the electric motor 43 which raises the grab bucket 1 can be made small.

  Next, when the rock breaking rod 2 is attached to one end of the bucket rock breaking rod side wire rope 14 and the rock breaking rod 2 is naturally dropped to break the hard rock mass to be drowned, the weight clutch 6 is released, and the heavy weight clutch 6 is released. The weight raising / lowering drum 44 and the bucket crushed rock raising / lowering drum 41 are disconnected. Further, the weight 7 is lowered to the lowest position so that no load is applied to the weight lifting drum 44 so that no rotational torque acts on it.

  The bucket crushed bar side clutch 5 is brought into a connected state, and the crushed rock bar 2 is pulled up to fall naturally. When the electric motor 43 is driven in the direction in which the rock breaking rod 2 is raised for lifting, the rotational driving force of the electric motor 43 drives the motor side drive gear 43c to rotate through the speed reducer 43d. Since the motor-side driven gear 43b is meshed with the motor-side driven gear 43c that is rotationally driven and interlocked with the motor-side driven gear 43b, the motor-side driven gear 43b is also rotationally driven. When the motor side driven gear 43b is driven to rotate, the motor side rotating shaft 43a connected to the rotation center of the motor side driven gear 43b is also driven to rotate.

  The bucket rocking rod lifting / lowering drum rotating shaft 41b is linked and linked to the motor-side rotating shaft 43a that is driven to rotate via the connected bucket-cracking rod-side clutch 5, so that it rotates integrally. By rotating the bucket rocking rod lifting / lowering drum rotating shaft 41b, the bucket rocking rod lifting / lowering drum 41 also rotates around the trunk.

  On the rotating bucket rock raising / lowering drum 41, the other end of the bucket rock breaking side wire rope 14 having one end connected to the rock breaking bar 2 is connected and wound. For this reason, when the other end side of the bucket rock breaking rod side wire rope 14 is wound around the drum 41 for raising and lowering the bucket breaking rock rod, the rock breaking rod 2 is raised and pulled up to a predetermined height.

  Thereafter, when the crushed rock bar 2 is allowed to fall naturally from a predetermined height, the connected state of the bucket crushed rock side clutch 5 is released. The rock breaking bar 2 pulled up to a predetermined height is connected to one end of a bucket rock breaking rod side wire rope 14 that is wound around the trunk of the drum 41 for raising and lowering the bucket breaking rock rod. By the dead weight of the rock breaking rod 2 pulled up through the bucket rock breaking rod side wire rope 14, rotational torque acts on the bucket rock raising / lowering drum 41 in the direction of rewinding it.

  By the way, when the connection state of the bucket rock breaking rod side clutch 5 is released, the bucket rock lifting rod lifting / lowering drum 41 is in a free state. The drum 41 rotates in the falling direction of the rock breaking rod 2, that is, the rewinding direction of the bucket rock breaking rod side wire rope 14, and the rock breaking rod 2 naturally falls.

  And when the tip side of the rock breaking bar 2 descends to the position where the hard rock is broken and reaches the bottom, the drum brake 42 is adjusted in advance so that the drum 41 for raising and lowering the bucket rock breaking bar lifting is stopped. Thereby, since the rock breaking bar 2 is held in a substantially straight state in which the tip side has broken the hard rock, the subsequent lifting operation of the rock breaking bar 2 can be performed without any trouble. When the rock breaking bar 2 is pulled up, as described above, the bucket rock breaking bar side clutch 5 is brought into a connected state.

  The drum brake 42 is preliminarily adjusted so that the rock breaking rod 2 is in a state lying or tilted when the rock breaking rod 2 is grounded. This is to avoid this because the upper side of the part swings irregularly around the part, and there is a danger in the lifting operation.

  The present invention is not limited to the embodiment for carrying out the invention, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Grab bucket 11 Main body block 12 Bucket shell 13 Suspension metal fitting 14 Bucket crushing rod side wire rope 15 Composite cable 2 Crushing rod 21 Lifting tool 3 Work boat 31 Swivel table 32 Crane jib 32a Hoisting operation bar 32b Hoisting winch 33 Electric room and swivel Drive chamber 34 Operation chamber 35 Wire rope for hoisting 36 Cable reel 4 Winch chamber 41 Drum for raising and lowering bucket rock breaking rod 41a Bucket breaking rock side drive gear 41b Drum rotating shaft for raising and lowering bucket breaking rock rod 41c Drum bearing for raising and lowering bucket breaking rock rod 42 Drum brake 42a Ring drum brake piece 43 Electric motor 43a Motor side rotating shaft 43b Motor side driven gear 43c Motor side drive gear 43d Reducer 43e Braking brake 44 Weight lifting drum 44a Weight lifting door Rotating shaft 44b Weight lifting drum bearing 44c Weight side rotating shaft 44d Weight side driving gear 5 Bucket rock bar side clutch 6 Weight side clutch 7 Weight 71 Guide column 72 Upper cross girder 73 Fixed pulley 74 Fixed pulley 75 Movable pulley 76 Weight side wire rope

Claims (3)

For lifting and lowering of a bucket crushed rock rod located on the work boat, the other end of the wire rope connected to the gravel bucket or crushed rock rod is connected to one end of the crane jib suspended from the tip of the crane jib provided on the work boat. It was connected to a drum and wound, and the drum for raising and lowering the bucket rock breaking rod and the electric motor that was the driving source for the drum were interlocked and connected to each other via a bucket rocking rod side clutch that intermittently connects the two, and installed on the work ship. The other end of the weight side wire rope connected to one end of the weight is connected to and wound around the weight lifting drum disposed on the work ship, and the weight lifting drum and the bucket rock bar lifting drum together interlockingly connected through the weight-side clutch that intermittently both bets, the bucket drilling rod lifting Dora interlockingly connected through the weight lift drums and the weight-side clutch If, grab dredging vessel, characterized in that the freely intermittently through the bucket drilling rod side clutch operatively connected between said electric motor. Bucket-crushing rod side drive gear is attached to the bucket crushing rod lifting drum, weight-climbing drive gear is attached to the weight lifting drum, and the bucket crushing rod-side driving gear and weight-side driving gear are linked to each other. 2. The grab dredger working vessel according to claim 1. 2. A grab dredger work vessel according to claim 1, wherein a drum brake is provided to stop the rotation of the drum for raising and lowering the bucket rock breaking rod when the rock breaking rod connected to one end side of the bucket rock breaking rod side wire is naturally dropped. .

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