JPH0575287U - Heavy lift machine - Google Patents

Abstract

(57) [Summary] [Purpose] Prevent the floor from falling out even when lifting heavy objects. [Structure] Two aerial work vehicles 5 and 5 are installed side by side, and a load platform 6 is provided on each of the work platforms 4 and 4 of each of these aerial work vehicles 5 and 5, and a heavy object is straddled over each load platform 6. By placing 7, the heavy object 7 is moved up and down by the two work platforms 5, 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lift machine for lifting and lowering heavy objects at a building construction site.

[0002]

[Prior Art]

 When a heavy object is installed on the ceiling at a building construction site, the heavy object may be lifted and lowered by a lift machine. As a lift machine for lifting and lowering heavy objects, there is known one in which a loading platform is attached to a machine base by an elevating mechanism so that it can be lifted and lowered, and a heavy load is placed on the loading platform.

[0003]

[Problems to be solved by the device]

 In such a lift machine, since the weight of a heavy object acts on the machine base via the loading platform and the lift mechanism, the weight of the heavy machine and the lift machine's own weight act intensively on the part of the floor that supports the machine machine, and The floor may slip out when the load becomes heavier than the load capacity of the floor, and conventional heavy lifting machines cannot lift heavy objects. In addition, the lift force of the lift mechanism that raises and lowers heavy items must be large enough to support the weight of the heavy items, and the lift force of the lift mechanism must be significantly large to raise and lower heavy items. Since a large-diameter cylinder is used and high-pressure fluid pressure is supplied to the cylinder, the lift machine is large and heavy, and the floor may fall out as described above. It will be expensive.

Therefore, an object of the present invention is to provide a heavy load lifting machine capable of solving the above-mentioned problems.

[0005]

[Means for Solving the Problems]

 A work platform 4 is movably provided on a traveling carriage 1 by a lift mechanism 3 to form an aerial work vehicle 5, and a load platform 6 is attached to each work platform 4 of the plurality of aerial work vehicles 5 to extend over each load platform 6. A heavy load lifting machine configured to mount a heavy load 7 and provided with means for vertically moving the lift mechanisms 3 of the plurality of work platforms 5 in synchronization.

[0006]

[Work]

 Since the weight of the heavy object 7 is dispersed and acts on the traveling carriages 1 of the plurality of aerial work vehicles 5, the weight acting on each traveling carriage 1 becomes lighter than the weight of the heavy goods 7 and the floor may come off. Never. When the heavy object 7 is not lifted or lowered, each aerial work vehicle 5 can be used independently to perform aerial work, so that each aerial work vehicle 5 can be efficiently operated.

[0007]

【Example】

 As shown in FIG. 1, a traveling trolley 1 has a plurality of steering and driving wheels 2, and a work platform 4 is provided on the traveling trolley 1 by a lift mechanism 3 so as to be able to move up and down. The loading platform 6 is mounted on the working platform 4 of the aerial work vehicle 5 so as to be rotatable in the horizontal direction, and the loading platform 6 has an upward U-shape and extends over the loading platforms 6, 6 adjacent to the left and right. And the heavy object 7 is placed. The traveling vehicle 1 is provided with an outlet 8 connected to a controller (not shown). By connecting the cord 10 of the control member 9 to the outlet 8 and operating the control member 9, a control signal is sent to the controller (not shown). By inputting, the operation of the steering / driving wheel 2 and the lift mechanism 3 is controlled. The cord 10 of the control member 9 is connected to one of the outlets 8 of the traveling vehicle 1 of the work vehicle 5 on one side, and the connecting cord 11 connected to the other outlet 8 runs on the work vehicle 5 on the other side. By connecting to one outlet 8 of the trolley 1 and operating one control member 9, a pair of aerial work vehicles 5 and 5 can be synchronously moved and moved up and down. As shown in FIG. 2, the lift mechanism 3 is composed of a telescopic link 12 and a lift cylinder 13, and the lift cylinder 13 is telescopically operated to extend and retract the telescopic link 12 to raise and lower the workbench 4. The stroke detection sensor 14 is attached to the lift cylinder 13 as shown in FIG.

Next, the operation of simultaneously expanding and contracting the lift cylinders 13 of the two lift mechanisms 3 will be described with reference to FIG. The lever 9a of the control member 9 is operated to input a signal to the controller 20, and the electromagnetic switching type operation valves 21 and 21 of the two lift mechanisms 3 are switched to extend the rod 13a of each lift cylinder 13. At the same time, the output of each stroke detection sensor 14 is input to the controller 20 and compared, and if the difference between the outputs is within the preset range, it is operated as it is, and the output difference is outside the preset range. In some cases, it is determined that the lift cylinder 13 of the lift mechanism 3 having the stroke detection sensor 14 having the largest output is extended for the longest stroke, and the operation valve 21 of the lift mechanism 3 is set to the neutral position for lifting. The cylinder 13 is stopped, and when the difference between the outputs of the stroke detection sensors 14 falls within a preset range, the operation valve 21 in the neutral position is switched to simultaneously extend the lift cylinders 13 of the lift mechanisms 3.

Next, the operation of traveling the two aerial work vehicles 5, 5 will be described. When the other lever 9b of the steering member 9 is operated, each steering and driving wheel 2 is steered in synchronization with the operating direction of the lever 9b, and two aerial work vehicles run in synchronization in that direction. Although two aerial work vehicles are used in the above embodiments, three or more aerial work vehicles may be used.

[0010]

[Effect of the device]

 Since the weight of the heavy object 7 is dispersed and acts on the traveling carriages 1 of the plurality of aerial work vehicles 5, the weight acting on each traveling carriage 1 becomes lighter than the weight of the heavy goods 7 and the floor may come off. Never. When the heavy object 7 is not lifted or lowered, each aerial work vehicle 5 can be used independently to perform aerial work, so that each aerial work vehicle 5 can be efficiently operated.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a lift machine.

FIG. 2 is a front view of a lift mechanism.

FIG. 3 is a front view of a lift cylinder.

FIG. 4 is a hydraulic circuit diagram of a lift cylinder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Traveling trolley, 3 ... Lift mechanism, 4 ... Workbench, 5 ... Highland work vehicle, 6 ... Luggage, 7 ... Heavy load, 14 ... Stroke detection sensor, 20 ... Controller, 21 ... Switching valve.

Continuation of the front page (72) Hidetaka Suzuki Hidetaka Suzuki 3-20-1 Nakase, Kawasaki-ku, Kawasaki City, Kanagawa Ltd. Komatsu Ltd. Kawasaki Plant

Claims (3)

[Scope of utility model registration request] 1. A work platform 4 is movably provided on a traveling carriage 1 by a lift mechanism 3 to form an aerial work vehicle 5, and a loading platform 6 is attached to each work platform 4 of the plurality of aerial work vehicles 5. A heavy load lifting machine configured to mount a heavy load 7 across a loading platform 6 and provided with means for vertically moving each lift mechanism 3 of the plurality of work platforms 5 in synchronization. 2. A lift cylinder 13 of each lift mechanism 3.
Stroke detection sensor 14 for detecting the stroke of
Switching valve 21 for supplying pressure oil to each lift cylinder 13
2. The heavy lift machine according to claim 1, wherein the controller 20 switches the switching valve 21 of the lift cylinder 13 having the largest stroke by comparing the strokes of the plurality of lift cylinders 13 with each other. 3. A heavy lift machine that can be operated independently by the aerial work vehicle of claim 1.