JPH082882A - Block type crane device - Google Patents

Abstract

PURPOSE:To prevent over-hoisting due to wrong operation by wrapping a wire rope around plural standing blocks and running blocks on a case main body, and pivoting a pair of guide blocks on the tip of the case main body so that, a wire rope can be stably delivered and rewound regardless of any attitude of a shovel arm. CONSTITUTION:Plural standing blocks 4 and plural running blocks 2 moved forward and backward by a bucket cylinder 10 are disposed on a case main body 1 removably installed on an arm (a) of a hydraulic shovel A by connecting shafts 9, 9'. A wire rope 7 is laid around both standing and running blocks 2, 4, and regardless of any attitude of a shovel arm (a), the wire rope 7 is stably delivered and rewound by a pair of upper and lower guide blocks 5, 6. Thus, over-winding of the wire rope 7 due to wrong operation can be prevented so as to surely conduct load hoisting work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley type crane device, in which a bucket cylinder of a hydraulic excavator can be used as a drive source of a hoisting device and a hydraulic excavator can be used as a pulley type crane. Another object of the present invention is to enable lifting and lowering of a suspended load through the hook portion without trouble even if the tip end portion of the jib arm is below the machine body installation surface of the hydraulic excavator.

[0002]

2. Description of the Related Art Generally, a hydraulic excavator is originally designed as an excavator except for a machine with a special attachment, but due to its convenience, it can also be used for transporting or hanging work at a construction site. The reality is that In civil engineering work, excavation work and suspended load work are inseparable, and originally it is desirable to share the work according to the specialty of excavator loading and unloading cranes, but small-scale operations are mainly performed by small machines. In the construction work, it is not easy to prepare and use both machines from the viewpoint of physical space and economically, and the excavator is used as it is as a cargo handling machine.

[0003]

However, the problem with using an excavator as a substitute for a crane is that it is very difficult to vertically move a suspended load, and it is difficult to move the suspended load vertically.
It is easy for the system to interfere with other objects, and the underground lift is limited to the working range of the front attachment.
If the hydraulic excavator has a function of vertically raising and lowering the hoisted load with a wire rope like a crane, the above problems can be solved, and work can be performed safely, easily and accurately. Like In addition, since it is possible to take a large underground lift, that is, below the machine installation surface of the hydraulic excavator, the workable range can be expanded. Also, in order to give the hydraulic excavator a function as a crane, the bucket that is not necessary for work is removed, and the arm is a wire winding consisting of a fixed pulley, a moving pulley, and a guide pulley (top sheave). By attaching the take-up device and moving the block of the moving pulley forward and backward with the bucket cylinder, the function as a lane can be obtained. In this case, the problem is that the front of the hydraulic excavator is difficult to operate safely and reliably in the shape of the crane boom.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is provided to provide a hydraulic excavator with a function as a crane. A plurality of fixed pulleys and a plurality of movable pulleys that move forward and backward by a bucket cylinder are arranged on a case body that is detachably attached to a frame by a connecting shaft, and wire ropes are wound around the pulleys. At the same time, a pair of upper and lower guide sheaves pivotally supported on the tip of the case main body can stably feed and retract the wire rope in any posture of the shovel arm.

[0005]

[Operation] The operation based on the above means is as follows.
That is, when the wire rope is being unwound, when the cylinder rod is pushed forward, the slide bracket connected to the rod advances along the length direction of the main body case. As a result, while the tension between the moving pulley that is pivotally supported by the slide bracket and that moves forward integrally and the wire wound around the moving pulley and the constant pulley is relaxed, the hook portion at the tip end of the wire rope is released. It descends through the lower guide pulley while maintaining an appropriate tension due to its weight. Next, in winding the wire from the above state, when the cylinder rod pushed forward is retracted, the moving pulley is also retracted along with the slide block along the length direction of the main body case, and the constant pulley is moved. Move away from. Then, the wire rope is taken up by the moving pulley, and the hook portion at the tip thereof rises.

In the figure, reference numeral 1 denotes a case body, which is an arm of a hydraulic excavator A (first arm a) with two mounting pins.
And a second arm a '), the second arm a'
It is fixed to. Reference numeral 2 denotes a plurality of moving pulleys that are axially supported by the slide block 3. The slide block 3 slides in the front-back direction on the upper surface of the case body by the bucket cylinder 10, so that the moving pulley 2 can move in the front-back direction on the case body 1. Has become. Reference numeral 4 denotes a plurality of fixed pulleys that are axially supported on the tip side of the case body 1, 5 is a lower guide pulley, and 6 is an upper guide pulley. Both pulleys are located in front of the fixed pulley 4 described above. -It is pivotally supported on the main body 1. Reference numeral 7 is a wire rope, which is wound around the fixed pulley 4 and the moving pulley 2 so as to be able to extend and retract. When the tip portion of the second arm a'protrudes forward of the first arm a, the tip portion of the wire rope 7 is guided and supported by the lower guide pulley 5. . Further, when the second arm a'is folded inside the first arm a, the tip end portion of the wire rope 7 is guided and supported by the upper guide pulley 6. . When the second arm is vertically downward, the wire rope 7 is guided by the upper and lower guide pulleys 5 and 6. 8 is a wire rope 7
Is a hook portion provided at the tip of the casing 9, 9'is a mounting pin for mounting and fixing the case body 1 to the second arm a'of the hydraulic excavator A, and 10 is a bucket cylinder,
This is the drive source of this device. The cylinder - of the rod 10 ₁
A cylinder-block 3 is connected to.

[0007]

[Specific Operation Example] A specific operation example based on the above-described embodiment is as follows. That is, the wire - b - To feed the flop 7 and push the cylinder rod 10 ₁ forward,
The slide bracket 3 connected to the rod is advanced along the length direction of the main body case 1 according to the pushing amount. As a result, the moving pulley 2 pivotally supported by the slide bracket 3 and moving forward integrally, and the wire rope 7 wound around the moving pulley and the fixed pulley 4 are being fed out, and the wire rope is The weight of the hook portion 8 at the tip portion keeps an appropriate tension, and descends through the lower guide pulley 5. Next, in returning (winding) the wire rope 7 from the above-mentioned state, when the cylinder rod 10 ₁ pushed forward is retracted, the moving pulley 2
Together with the slide block 3 retreat along the length direction of the case body 1 and separate from the fixed pulley 4. Then, the wire rope 7 is taken up by the moving pulley 2 and the hook portion 8 at the tip thereof rises.

Next, a jib-shaped arm (first arm a, second arm
The operation of the arm a ') gradually falls forward from the uppermost standing state as shown in FIG. In this state, the hook 8 can move up and down via the wire 7, but in this case, the wire tip portion is guided by the lower guide pulley 5. Also, when the jib-shaped arm is at the bottom,
The first arm a is located below the ground on which the hydraulic excavator is installed, and the second arm a'combined with the tip of the first arm is the first arm. Even when the hook portion 8 is folded inside, the hook portion 8 can move up and down through the wire 7, but in that case, the wire-tip portion is guided to the upper guide pulley 6.

[0009]

Since the present invention has the above-mentioned structure, the present apparatus eliminates irregular winding of the wire as compared with the winch winding apparatus. There is no excessive winding due to erroneous operation. Break,
It is very easy to handle because there is no need to worry about clutch failure or adjustment, and it is useful as a new multi-ply crane device of this type. The feature of this machine is that it is equipped with an upper guide pulley in addition to a lower guide pulley, so that it is possible to carry out hanging work reliably without pulling out even in various postures. Further, in the present apparatus, even if the second arm is located below the ground, the second arm is folded inside the first arm to suspend the hook. Since the wire to be guided is guided and supported by the upper guide pulley, even if the second arm of the wire is located at a lower position lower than the ground where the hydraulic excavator is installed, a heavy object can be hoisted or hung. It is possible, and there is a new advantage as this type of pulley crane.

[Brief description of drawings]

FIG. 1 is a block diagram showing a hydraulic excavator according to the present invention.
FIG. 4 is a front view showing an operating state of the arm, which is provided with a switching device.

FIG. 2 is an enlarged front view of the pulley crane device according to the present invention in FIG.

FIG. 3 is a front view of the pulley type crane device according to the present invention in a state where the wire rope is extended from the state of FIG.

FIG. 4 is a plan view of FIG. 2;

[Explanation of symbols]

 1 Main Case 2 Moving Pulley 3 Sliding Block 4 Fixed Pulley 5 Lower Guide Pulley 6 Upper Guide Pulley 7 Wire Rope 8 Hook 9 Body Mounting Pin 10 Bucket Cylinder-

Claims (1)

[Claims] 1. A plurality of fixed sheaves (1) mounted on a casing body (1) detachably attached to an arm (a) of a hydraulic excavator (A) by connecting shafts (9) and (9 '). 4) and a plurality of moving pulleys (2) that move forward and backward by the bucket cylinder (10) are arranged, and wire pulleys are attached to both pulleys (2) and (4).
A wire which is stable regardless of the posture of the shovel arm (a) due to a pair of upper and lower guide sheaves (5) and (6) which are wound around the windshield (7) and pivotally supported on the tip of the case body (1). A pulley type crane device characterized by feeding and returning a rope.