JP2000291609A - Fluid pressure generating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pressure generating apparatus which is capable of operating without using an outer electric power. SOLUTION: This apparatus has a first arm 61 rotatably supported on a head block 6 through a pin 87, a second arm 62 rotatably supported on the head block 6 through a pin 88, torsion springs 89, 90 which are capable of rotating the arms 61, 62 in such directions as that respective upper ends of the arms 61, 62 get near each other, respectively, a fluid-pressure generating cylinder 60 connected to a lower end portion of the first arm 61 at a housing 67 thereof and connected to a lower end portion of the second arm 68 at a piston rod 68 thereof, an intake conduit 69 communicating an operating oil tank 41 to a head side fluid chamber of the cylinder 60, and a discharge conduit 73 communicating the head side fluid chamber of the cylinder 60 to an accumulator 66. The upper end portions of both the arms 61, 62 are engaged with dispensing ends of hoisting and lowering ropes 95.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pressure generator used for cargo handling equipment such as a container crane.

[0002]

2. Description of the Related Art FIGS. 7 to 10 show an example of a container crane. The container crane includes a land-side rail R1 and a sea-side rail R2 laid on a quay G facing a port S, and both of these rails. Legs 1a running on R1 and R2,
1b, a girder 3 provided substantially horizontally above the traveling body 2, a boom 4 pivotally supported by a top end of the girder 3 so as to be pivoted upward and rotatably; A trolley 5 traversing along the boom 4, a head block 6 suspended from the trolley 5 and capable of moving up and down with respect to the trolley 5, and a container C mounted on the head block 6 and having a container C
And a spreader 7 that can lock the wheels 9. The trolley 5 is pivotally supported with wheels 9 that can roll on rails 8 attached to the left and right sides of the girder 3 and the boom 4.

In a machine room 10 located above the girder 3, a boom raising / lowering drum 11 for raising and lowering the boom 4 and a head block lifting / lowering rope 13 are wound up by winding or unwinding a boom raising / lowering rope 11. Alternatively, a head block elevating drum 14 for raising and lowering the head block 6 by unreeling, and a trolley traversing drum 16 for traversing the trolley 5 by winding or unwinding the trolley traversing rope 15 are arranged. Head block lifting rope 1
3 is wound around a sheave 17 pivotally supported by the trolley 5 and a sheave 18 pivotally supported by the head block 6.

[0004] The head block 6 is equipped with a twist lock pin 19 for engaging a spreader projecting downward from four corners thereof and rotatable by 90 ° in the circumferential direction, and a cable basket 20 located at the center of the upper surface. A power supply cable 21 hanging down from the machine room 10 to the head block 6 via the trolley 5 is sequentially stored in the cable basket 20 when the head block 6 rises with respect to the trolley 5, and the head is connected to the trolley 5 with the head. When the block 6 descends, it is sequentially sent out from the cable basket 20.

The spreader 7 has a fixed frame 23 having a pair of front and rear guide beams 22 extending horizontally in a direction perpendicular to the trolley 5 transverse direction, and is fixed to the upper surface of the fixed frame 23 and is attached to the head block 6. A connecting member 24 with which the twist lock pin 19 can be engaged, and each guide beam 2
A pair of movable beams 25 located on the front side in the traverse direction of the trolley 2
And a telescopic frame 2 fitted to a portion near one end of the fixed frame 23 so as to reciprocate in the traveling direction of the traveling body 2.
6 and a pair of movable beams 27 located on the rear side in the trolley traverse direction of each guide beam 22, and is fitted to the end near the other end of the fixed frame 23 so as to be able to reciprocate in the traveling direction of the traveling body 2. A telescopic frame 28, a twist lock pin 29 for container engagement provided at two end portions of the telescopic frames 26 and 28 so as to protrude downward and rotatable by 90 ° in the circumferential direction; Between a hydraulic cylinder 30 for rotating the cylinder 29 and two positions provided at the distal ends of the telescopic frames 26 and 28 and protruding downward to be able to contact the corners of the container C and protruding upward. , A hydraulic rotary vane motor 32 for rotating the guide flipper 31, a sprocket 33 pivotally supported at one end of the fixed frame 23, and a part near the other end. And supporting and endless chain 35 wound around the sprockets 34, the hydraulic unit 3 a sprocket 36 meshing with the chain 35 and the forward rotation and the hydraulic motor 37 capable of reverse rotation, mounted to the fixed frame 23
8 is provided.

The hydraulic unit 38 is connected to the power supply cable 21.
, A hydraulic pump 40 driven by the electric motor 39, and a hydraulic oil tank 41.

A line 42 communicating with the hydraulic oil tank 41 is connected to a suction port of the hydraulic pump 40.
A pipe 44 for returning hydraulic oil to the hydraulic oil tank 41 in accordance with the set pressure of the relief valve 43 communicates with the discharge port of.

[0008] Switching valves 45, 46 and 47 are interposed between the hydraulic motor 37, the hydraulic rotary vane motor 32 and the hydraulic cylinder 30, and between the hydraulic pump 40 and the hydraulic oil tank 41.

The switching valve 45 is a three-position, four-port valve of the electromagnetic switching type. The pump port of the switching valve 45 is connected to a pipeline 48 communicating with the discharge port of the hydraulic pump 40, and the tank port is connected to A pipe 49 communicating with the hydraulic oil tank 41 is connected.

[0010] To each switching port of the switching valve 45, pipes 50 and 51 communicating with the oil supply / discharge port of the hydraulic motor 37 are connected.

The switching valves 46 and 47 are two-position, four-port valves of an electromagnetic switching type, and the pump ports of the switching valves 46 and 47 are connected to a pipeline 52 communicating with the discharge port of the hydraulic pump 40. The port is connected to a conduit 53 communicating with the hydraulic oil tank 41.

Each switching port of the switching valve 46 has a pipe 5 communicating with a supply / drain port of the hydraulic rotary vane motor 32.
4, 55 are connected.

A pipe 56 communicating with the head side fluid chamber of the hydraulic cylinder 30 is connected to one switching port of the switching valve 47, and the rod side fluid of the hydraulic cylinder 30 is connected to the other switching port of the switching valve 47. A conduit 57 communicating with the chamber is connected.

The spreader 7 is mounted on the lower side of the head block 6 when the twist lock pin 19 is engaged with the connecting member 24.

A predetermined portion of the chain 35 is locked at connection points 26a and 28a of the telescopic frames 26 and 28. When the hydraulic motor 37 rotates in the forward or reverse direction, the center of the fixed frame 23 is turned around. The two telescopic frames 26, 28 move away from each other or in a direction approaching each other, and the distance between the twist lock pin 29 of one telescopic frame 26 and the twist lock pin 29 of the other telescopic frame 28 is set to 20 ft container, It can be adjusted according to the 40 ft container and the 45 ft container.

In the container crane shown in FIGS. 7 to 10, the traveling body 2 moves with respect to the quay G, the trolley 5 traverses the girder 3 and the boom 4, the head block 6 moves up and down with respect to the trolley 5, and the spreader 7 engages the container C. The unloading operation of the container C from the ship V to the quay G or the loading operation of the container C from the quay G to the ship V is performed by combining the stopping operations.

Furthermore, with the recent increase in the size of the ship V, it has been studied to increase the traversing distance of the trolley 5 and increase the head of the head block 6 and to improve the elevating speed of the head block 6. ing.

[0018]

However, if the head of the head block 6 is increased, the power supply cable 21 for supplying electric power to the electric motor 39 of the hydraulic unit 38 will be described.
Becomes longer, making maintenance and inspection of the power supply cable 21 difficult.

When the speed of raising and lowering the head block 6 is increased, the storage of the power supply cable 21 in the cable basket 20 and the transmission of the power supply cable 21 from the cable basket 20 cannot follow the elevation of the head block 6. There is a concern that the power supply cable 21 may be damaged such as buckling or breakage.

The present invention has been made in view of the above circumstances, and has as its object to provide a hydraulic pressure generator which can operate without obtaining external power.

[0021]

In order to achieve the above object, in the hydraulic pressure generating device according to the first aspect of the present invention, an intermediate portion in the vertical direction is pivotally supported by the hanging member by the first pin extending in the horizontal direction. A first arm, a second arm positioned on the side of the first arm and parallel to the first pin and having a vertically intermediate portion pivotally supported by a hanging device by a second pin; Urging means for rotating the arms in a direction in which their upper ends approach each other; and a hydraulic pressure generator having a housing connected to the lower end of the first arm and a piston rod connected to the lower end of the second arm. Cylinder, an upstream end communicates with the hydraulic fluid tank and a downstream end communicates with one fluid chamber of the cylinder, and an upstream end communicates with one fluid chamber of the cylinder and the downstream end communicates with the accumulator. And a discharge pipe that communicates with each arm. Parts to lock the feeding end of the lifting rope handling facility, are connected to a hydraulic fluid feed line to the hydraulic actuator that accompanies the accumulator suspender.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the first and second arms are connected to each other. A third arm interposed and having an intermediate portion pivotally supported by a hanger by a third pin parallel to the first pin, a proximal end connected to one end of the third arm and a distal end connected to a third arm; A first link bar connected to a lower end of the first arm; and a second link bar connected to a lower end of the third arm and a distal end connected to a lower end of the second arm. And a link bar.

In any of the hydraulic pressure generating devices according to the first and second aspects of the present invention, when the hanging tool or the object to be transported locked by the hanging tool leaves the floor, its own weight, Alternatively, the load obtained by adding the weight of the object to be transported to the
The first arm and the second arm are rotated in directions in which their upper ends are separated from each other against the restoring force of the urging means. At the time of landing, the restoring force of the urging means causes the first arm and the second arm to rotate in the direction in which the upper ends thereof approach each other, and expands and contracts due to the proximity of these two arms. Cylinder sucks the working fluid in the working fluid tank and discharges the working fluid to the accumulator.

Further, in the hydraulic pressure generating device according to the second aspect of the present invention, the link mechanism formed by the third arm, the first link bar, and the second link bar causes the first mechanism for the hanging member to be moved. And the second arm have the same rotation angle.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 show an embodiment of the hydraulic pressure generating apparatus according to the present invention. In the drawings, the same reference numerals as in FIGS. 7 to 10 denote the same parts.

This hydraulic pressure generating device includes a hydraulic pressure generating cylinder 60, a first arm 61, a second arm 62, a third arm 63, a first link bar 64, a second link bar 65, The accumulator 66, the hydraulic oil tank 41, and the accumulator 66 and the switching valves 45, 46, and 47 described above.
And on-off valves 77 and 78 interposed therebetween.

Of these components, the cylinder 60,
Each arm 61, 62, 63 and each link bar 64, 6
Reference numerals 5 are arranged at a portion near one end and a portion near the other end of the head block 6 in the moving direction of the traveling body 2 (see FIG. 7).

The cylinder 60 is, for example,
7 is disposed inside the head block 6 in a sideways state in which the piston rod 68 is located on the land side and the piston rod 68 is located on the sea side.

A supply suction pipe 69 communicating with the hydraulic oil tank 41 is connected to the head-side fluid chamber of the cylinder 60, and a buffer suction pipe 70 is connected to the rod-side fluid chamber of the cylinder 60. Each of the suction pipes 69 and 70 has a check valve 7 that allows the flow of the hydraulic oil from the hydraulic oil tank 41 to the cylinder side and prevents the flow of the hydraulic oil in the opposite direction.
1,72.

A portion of the supply suction line 69 located closer to the cylinder 60 than the check valve 71 is connected to the supply discharge line 73 communicating with the accumulator 66 via the manual opening / closing valve 58.
The supply discharge pipe 73 is provided with a check valve that allows the flow of hydraulic oil from the fluid chamber on the head side of the cylinder 60 to the accumulator 66 and prevents the flow of hydraulic oil in the opposite direction. 75.

A portion of the buffering suction line 70 located closer to the cylinder 60 than the check valve 72 is connected to a buffering discharge line 74 communicating with the hydraulic oil tank 41. The passage 74 has a check valve 76 that allows the flow of the hydraulic oil from the fluid chamber on the rod side of the cylinder 60 to the hydraulic oil tank 41 and prevents the flow of the hydraulic oil in the opposite direction.

That is, the cylinder 60, the supply suction pipe 69, the supply discharge pipe 73, and the check valves 71 and 75
A reciprocating piston type pump mechanism for supplying hydraulic oil from the hydraulic oil tank 41 to the accumulator 66 is formed, and a buffer suction line 70, a buffer discharge line 74, a check valve 72,
76 forms a buffer mechanism that transfers hydraulic oil between the hydraulic oil tank 41 and the rod-side fluid chamber and suppresses rapid movement of the piston 59.

The on-off valves 77 and 78 are two-position two-port valves of an electromagnetic switching type, and the accumulator 6 is connected to the inlet ports of both on-off valves 77 and 78 via the manual on-off valve 58.
6 is connected to the pipeline 79.
Has a check valve 80 that allows the flow of hydraulic oil from the accumulator 66 to the on-off valves 77 and 78 and prevents the flow of hydraulic oil in the opposite direction.

A pipe 81 communicating with the pump port of the switching valve 45 is connected to the outlet port of the one on-off valve 77.
The outlet port of the other opening / closing valve 78 is connected to a pipe 82 communicating with each of the pump port of the switching valve 46 and the pump port of the switching valve 47.

Thus, the operating oil pressure stored in the accumulator 66 is changed by the pipeline 79, the on-off valves 77 and 78, and the pipeline 8
1, 82, switching valves 45, 46, 47, and pipes 50, 5
After passing through 1, 54, 55, 56, 57, the hydraulic motor 37,
It is provided to each of the hydraulic rotary vane motor 32 and the hydraulic cylinder 30.

The accumulator 66 is connected to a pipe 84 for returning hydraulic oil to the hydraulic oil tank 41 in accordance with the set pressure of the relief valve 83.

Further, the solenoids of the switching valves 45, 46, 47 and the on-off valves 77, 78 are excited in the head block 6 or the spreader 7 based on a radio signal transmitted from the cab of the container crane. A power supply device (not shown) for outputting a current is mounted.

The vertical intermediate portion of the first arm 61 is
Bracket 8 provided on the land side end of head block 6
5, a second arm 62 pivotally supported by a first pin 87 extending substantially horizontally in the direction of movement of the traveling body 2 (see FIG. 7).
The middle portion in the vertical direction is pivotally supported by a second pin 88 parallel to the pin 87 on a placket 86 provided at the end of the head block 6 near the sea.

The first arm 61 and the second arm 6
The shape of No. 2 is set symmetrically with respect to the center line of the head block 6.

The first pin 87 and the second pin 88 include:
Torsion springs 89, 90 for rotating the arms 61, 62 in directions in which their upper ends approach each other are fitted outside.

The torsion springs 89, 90 are
The winding start end is in contact with the head block 6 and the winding end is engaged with the arms 61 and 62.

At the lower end of the first arm 61, the above-described housing 67 of the cylinder 60 is pivotally supported by a pin 91. At the lower end of the second arm 62, the piston rod of the cylinder 60 is mounted. 68 is pivotally supported by a pin 92.

Further, at the upper ends of both arms 61 and 62,
A paying end of a lifting rope 95 hanging from a drum 94 installed on the trolley 93 is locked.

When each of the drums 94 is rotated by the drive source 96, the spreader 7 is lifted from the container C (see FIG. 7) as the head block 6 and the spreader 7 are raised, and is engaged with the spreader 7. Container C as an object to be transported is another container C, ship V (see FIG. 7)
When the user lifts the floor from the bottom of the hold or the chassis of the trailer, the weight of the container C added to the weight of the head block 6 and the spreader 7 or the weight of the container C is added to the restoring force of the torsion springs 89 and 90. The arms 61 and 62 are pivoted to a position where they are substantially upright against
The cylinder 60 will shrink.

The head block 6 and the spreader 7
When the spreader 7 is landed on the container C with the lowering of the container C, or when the container C as an object to be transported engaged with the spreader 7 is on another container C, the bottom of the hold of the ship V,
Or, when landing on the chassis of the trailer, the restoring force of the torsion springs 89, 90 causes the two arms 61,
The cylinder 62 is rotated to a position where the upper ends thereof are close to each other and become substantially sideways, and the cylinder 60 is extended.

That is, the first arm 61, the second arm 62, and the torsion springs 89, 90 form an expansion / contraction mechanism for extending or contracting the cylinder 60 in accordance with the elevation of the head block 6.

The third arm 63 is arranged between the first arm 61 and the second arm 62 and pivotally supported on the head block 6 by a third pin 97 having an intermediate portion parallel to the pin 87. Have been.

The distances from the center of the third pin 97 to the centers of the first pin 87 and the second pin 88 are set equal.

The first link bar 64 has a base end pivotally supported on the lower end of the third arm 63 via a pin 98 and a distal end having the pin 91 connected to the lower end of the first arm 61. Is pivoted through.

The second link bar 65 has a base end pivotally supported on the upper end of the third arm 63 via a pin 99 and a distal end connected to the pin 92 on the lower end of the second arm 62. Is pivoted through.

The shapes of the first link bar 64 and the second link bar 65 are set symmetrically with respect to the center line of the head block 6.

That is, the first arm 61 and the second arm 62 with respect to the head block 6 are formed by the third arm 63, the first link bar 64, and the second link bar 65.
A Z-link mechanism for matching the rotation angles of the two is formed.

In the hydraulic pressure generating apparatus shown in FIGS. 1 to 6, when the drum 94 provided on the trolley 93 is rotated by the drive source 96, the lifting rope 95 is wound on the drum 94, or the lifting rope is lifted. The head block 6 and the spreader 7 move up and down as the 95 is fed from the drum 94.

When the spreader 7 has not landed on the container C (see FIG. 7), or when the container C locked on the spreader 7 is in another container C, the inner bottom of the ship V (see FIG. 7), Alternatively, when the vehicle is not landing on the trailer chassis, the weight of the head block 6 and the spreader 7 is reduced.
Alternatively, since the load obtained by adding the weight of the container C to the weight of the hanging tool is rotating the arms 61 and 62 to the position where the arms 61 and 62 are substantially upright against the restoring force of the torsion springs 89 and 90, the cylinder 60 Is in a reduced state.

As the head block 6 and the spreader 7 descend, the spreader 7 may land on the container C,
When the container C engaged with the spreader 7 lands on another container C, the inner bottom of the hold of the vessel V, or the chassis of the trailer, the load is not applied to the lifting rope 95, and slack occurs. The restoring forces 89 and 90 rotate the arms 61 and 62 to positions where the upper ends of the arms 61 and 62 are close to each other and are in a substantially horizontal state.

As a result, the cylinder 60 extends, and the cylinder 6 extends from the hydraulic oil tank 41 through the supply suction pipe 69.
Hydraulic oil is supplied to the head-side fluid chamber of No. 0.

The hydraulic oil is delivered from the rod-side fluid chamber of the cylinder 60 to the hydraulic oil tank 41 through the buffer discharge pipe 74.

Next, as the head block 6 and the spreader 7 rise, the spreader 7 leaves the container C, or the container C engaged with the spreader 7 moves to another container C or the bottom of the ship V of the ship V. When the floor is lifted from the chassis of the trailer, the weight of the container C to the weight of the head block 6 and the spreader 7 or the weight of these hanging members is increased by the torsion spring 8.
The two arms 61 and 62 are turned to a position substantially upright against the restoring force of 9, 90.

As a result, the cylinder 60 contracts, and hydraulic oil is sent from the fluid chamber on the head side of the cylinder 60 to the accumulator 66 via the supply discharge pipe 73.

The hydraulic oil is supplied from the hydraulic oil tank 41 to the rod side fluid chamber of the cylinder 60 via the buffer suction line 70.

Further, on-off valves 77 and 78 and switching valves 45 and 4
When the solenoids 6 and 47 are excited, the accumulator 6
The working oil pressure stored in 6 is applied to the hydraulic motor 37, the hydraulic rotary vane motor 32, and the hydraulic cylinder 30.

As described above, in the hydraulic pressure generating apparatus shown in FIGS. 1 to 6, the lifting and landing of the spreader 7 and the lifting and landing of the container C as the object to be conveyed, which is locked to the spreader 7, are performed. Since the oscillating first arm 61 and second arm 62 expand and contract the hydraulic pressure generating cylinder 60, hydraulic oil can be sent from the hydraulic oil tank 41 to the accumulator 66 without obtaining external power. .

Therefore, the power supply cable 21 (see FIG. 8)
Becomes unnecessary, it is possible to lengthen the traversing distance of the trolley 93, increase the head of the head block 6, and improve the elevating speed of the head block 6.

A Z-link mechanism is formed by the third arm 63, the first link bar 64, and the second link bar 65, and the first arm 61 and the second arm 62 rotate with respect to the head block 6. Since the angles are matched, the amount by which the lifting rope 95 is fed to each drum 94 can be made equal.

The hydraulic pressure generating device of the present invention is not limited to the above-described embodiment, and it goes without saying that the following various changes can be made.

For example, the supply suction line 69 is connected to the rod side fluid chamber of the cylinder 60 instead of the connection state of the supply suction line 69 and the buffer suction line 70 as shown in FIGS. If the buffer suction line 70 is connected to the head-side fluid chamber of the cylinder 60, the hydraulic oil tank 41 moves the cylinder from the hydraulic oil tank 41 when the spreader 7 leaves the floor or when the container C engaged with the spreader 7 leaves the floor. The hydraulic oil is fed to the rod-side fluid chamber of the cylinder 60 and the accumulator 6 is moved from the rod-side fluid chamber of the cylinder 60 when the spreader 7 lands or when the container C engaged with the spreader 7 lands.
6 will be sent.

Further, instead of the torsion springs 89 and 90, a torsion bar can be used as the urging means for the first arm 61 and the second arm 62.

[0069]

As described above, according to the hydraulic pressure generator of the present invention, the following various excellent effects can be obtained.

(1) The first arm and the second arm that swing by the lifting and landing of the hanging tool and the lifting and lowering of the object to be transported locked by the hanging tool are used for generating hydraulic pressure. The cylinder is expanded and contracted, and hydraulic oil is sent from the hydraulic fluid tank to the accumulator without obtaining external power.This eliminates the need for a power supply cable, increasing the head block lift and improving the head block elevating speed. It becomes possible to plan.

(2) The link mechanism formed by the third arm, the first link bar, and the second link bar matches the rotation angles of the first arm and the second arm with respect to the head block. Therefore, the amount of lifting of the lifting rope can be made equal.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a state in which a cylinder for generating hydraulic pressure is reduced in an example of an embodiment of a hydraulic pressure generating device of the present invention.

FIG. 2 is a conceptual diagram showing a state in which a cylinder for generating hydraulic pressure is extended in an example of an embodiment of the hydraulic pressure generating device of the present invention.

FIG. 3 is a detailed view showing an expansion / contraction mechanism and a Z-link mechanism in a cylinder contraction state.

FIG. 4 is a detailed view showing an expansion / contraction mechanism and a Z-link mechanism in a cylinder extension state.

FIG. 5 is a partial side view showing a container crane equipped with the hydraulic pressure generating device of the present invention.

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5;

FIG. 7 is a side view showing an example of a container crane.

FIG. 8 is a front view of the spreader in FIG. 7;

FIG. 9 is a view on arrow IX-IX of FIG. 8;

FIG. 10 is a conceptual diagram showing a working oil supply path to the hydraulic actuator of the spreader in FIG. 7;

[Explanation of symbols]

6 Head Block (Hanging Tool) 7 Spreader (Hanging Tool) 30 Hydraulic Cylinder (Hydraulic Actuator) 32 Hydraulic Rotary Vane Motor (Hydraulic Actuator) 37 Hydraulic Motor (Hydraulic Actuator) 41 Hydraulic Oil Tank (Hydraulic Liquid Tank) 60 Cylinder 61 first arm 62 second arm 63 third arm 64 first link bar 65 second ring bar 66 accumulator 67 housing 68 piston rod 69 supply suction line 73 supply discharge line 79 line ( Hydraulic fluid supply conduit) 81 Pipeline (hydraulic fluid supply conduit) 82 Pipeline (hydraulic fluid supply conduit) 87 First pin 88 Second pin 89 Torsion spring 90 Torsion spring 95 Elevating rope 97 Third pin

Continued on the front page (72) Inventor Toshitaka Ohno 3-1-1-15 Toyosu, Koto-ku, Tokyo Ishikawajima-Harima Heavy Industries Co., Ltd. Toni Technical Center (72) Inventor Takeo Hashizume 3-1-1, Toyosu, Koto-ku, Tokyo No. Ishikawajima Harima Heavy Industries Co., Ltd. Tojin Technical Center (72) Inventor Shuichi Fukushi 3-1-1-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toji Technical Center F term (reference) 3F004 AA03 AC04 AJ01 EA24 KB01 3H089 CC02 CC08 CC12 DB46 DC02 EE12 GG02 JJ08

Claims (2)

[Claims] 1. A first arm having a vertically intermediate portion pivotally supported by a suspender by a first pin extending in a lateral direction, and a first arm located at a side of the first arm and parallel to the first pin. Second
A second arm having an intermediate portion in the up-down direction pivotally supported by the hanging member by a pin, a biasing means capable of rotating each arm in a direction in which the upper ends thereof approach each other, and a lower end of the first arm. A hydraulic pressure generating cylinder having a housing connected thereto and a piston rod connected to a lower end of the second arm, and suction having an upstream end communicating with the hydraulic fluid tank and a downstream end communicating with one fluid chamber of the cylinder; A pipe and a discharge pipe whose upstream end communicates with one fluid chamber of the cylinder and whose downstream end communicates with the accumulator are provided, and the leading end of the lifting rope of the cargo handling equipment is locked to the upper end of each arm. A hydraulic pressure generator, wherein an accumulator is connected to a hydraulic fluid supply line to a hydraulic actuator attached to a hanging device. 2. A third arm located between the first arm and the second arm and having an intermediate portion pivotally supported by the hanging device by a third pin parallel to the first pin, and a proximal end. A first link bar having a portion connected to one end of the third arm and a distal end connected to the lower end of the first arm; a base end connected to the other end of the third arm; The hydraulic pressure generator according to claim 1, further comprising a second link bar having a distal end connected to a lower end of the second arm.