JPH028953Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a counterbalance crane that improves workability during crane assembly.

(Prior art) A counterbalance crane is equipped with a long main jib, a mast, and a counterweight truck. During assembly, the mast is held in a forward tilted state, and the main jib is laid down to a predetermined length. After assembly, the wire rope for hoisting the main jib hanging from the top of the mast is connected to the top of the main jib via the upper spretsuda and the guy line for the main jib, and then the mast is tilted backwards and the wire rope for hoisting the main jib is connected to the top of the mast. Connect the counterweight truck with the counterweight truck guyline, then raise the main jib,
It is used for crane work.

In this case, the upper end of the counterweight truck guyline is usually fixed to the upper end of the mast before its lower end is connected to the counterweight truck, but when assembling the crane, the lower end of this guyline is remains free. For this reason, conventionally, in order to prevent this guy line from getting in the way when assembling the crane, the guy line was suspended from the top of the mast to the ground when the mast was tilted forward, and then when the mast was tilted backward, the guy line was suspended from the ground when the mast was tilted backward. Connect another hemp rope, etc. to the lower end of the guyline to prevent it from hitting the upper revolving structure, etc., and while the worker pulls the rope by hand, move the guyline backwards and connect it from the top of the mast to the mast guyline. The lower end is connected to the counterweight truck. If the guy lines for the counterweight truck were to be operated by hand each time in this way, the work would be extremely complicated, and the heavy weight of the guy lines would require a great deal of effort.
There is a problem of poor workability.

(Purpose of the invention) The present invention was made in order to solve such conventional problems, and it is possible to prevent the guy line for the counterweight truck from getting in the way when assembling the crane, and to make it possible to install the guy line one by one. To provide a counterbalance crane that eliminates the need for manual operation, reduces labor, and improves workability.

(Structure of the invention) The present invention has a main jib and a mast installed on the upper revolving body so that they can be raised and lowered freely via a wire rope for hoisting and a guy line, and a guy line for a counterweight bogie hanging from the upper end of the mast is connected to the upper revolving body. In a counterbalance crane connected to a counterweight truck connected to the rear end of the crane, a receiver is installed between the left and right ropes of the mast guyline to catch the counterweight truck guyline when the mast is tilted forward. This is a characteristic feature.

As a result, the guy line for the counterweight truck is held in the receiver and the guy line does not get in the way when the crane is assembled.

(Example) Figures 1 and 2 are overall side views showing the state of the counterbalance crane during and after assembly. In the figures, 1 is the lower running body, 2 is the upper revolving body, and 3 is the upper A main jib 4 is provided on the revolving body 2 so that it can be raised and lowered freely, and 4 is the back of the main jib 3 and is attached to the upper revolving body 2.
5 is a hook for main hoisting, 6 is a wire rope for main hoisting, 7 is a wire rope for hoisting the main jib, 8 is a guy line for the main jib, 9 is a gantry, and 10 is a wire for mast hoisting. rope, 11
12 is a guy line for the mast, 12 is a counterweight truck, 13 is a guy line for the counterweight truck, and 14 is a connecting rod between the upper rotating body 2 and the counterweight truck 12.

In the above-mentioned counterbalance crane, the mast hoisting wire rope 10 is connected to the upper spreader 1.
5 (see FIG. 3) and a plurality of sheaves (not shown) provided in the lower spreader 17, one end of which is connected to the lower spreader 17 or the upper spreader 1.
5, and the other end is wound around the mast hoisting drum 18. Note that the lower spreader 17 is connected to the gantry 9. Upper spreader 15
There are guy line connection brackets 19 on both left and right sides.
(see Fig. 4), and a guy line link 2 is provided between both brackets 19 and a pair of guy line connecting brackets 20 provided at the upper end of the mast 4.
A mast guy line 11 consisting of a pair of left and right cables is stretched across the mast guy line 1 and a pin 22, etc.

At several locations in the longitudinal direction of this mast guy line 11, receivers 23 for the counterweight truck guy line 13 are provided between the left and right mast guy lines 11. This receiver 23 is made of, for example, a wire rope, and both ends thereof are fixed to the left and right guy lines 11 via fixing devices 24 such as shacks. In this case, the receiver 23 is fixed so that it does not shift. Note that the receiver 23 is not limited to a wire rope, but may be a rod, and is not limited to being made of metal, but may be made of synthetic resin.

On the other hand, a pair of holding pieces 25 are protruded from the upper surface of the upper spreader 15 at both left and right ends, and a holding part 26 of the counterweight truck guy line 13 is formed between each holding piece 25 . The interval between the left and right holding parts 26 is formed wider than the width of the gantry 9.

In the above configuration, when assembling the counterbalance crane, first the mast 4 is raised from the collapsed state to the forward tilted state shown in FIG. 1 via the gantry 9, the mast hoisting wire rope 10, and the mast guy line 11. At this time, the upper end of the counterweight truck guyline 13 is connected to the back of the upper end of the mast 4, and the lower part thereof is held by receivers 23 provided at several locations in the longitudinal direction of the mast guyline 11, and the guyline 13 is They are distributed to the left and right and are engaged and held by the holding parts 26 provided on the upper surface of both the left and right ends of the upper spreader 15, and their lower ends are hung on both sides of the mast hoisting wire rope 10. As a result, the counterweight bogie guy line 13 is connected to the main jib hoisting wire rope 7, the mast 4 and the mast hoisting wire rope 10.
The mast 4 and the next main jib 3 can be raised without any trouble.

Next, with the lower main jib 3a of the main jib 3 laid down, a plurality of intermediate main jibs 3b are added to the lower main jib 3a, and the upper main jib 3c is further connected to the upper end of the lower main jib 3a to obtain a predetermined length. Assemble main jib 3. After that, after connecting the upper spreader 7a of the main jib hoisting wire rope 7 suspended from the upper end of the mast in the forward leaning state and the upper end of the main jib 3 by the main jib guy line 8, the mast hoisting wire rope 10 is connected. Take it up and tilt the mast 4 backward. As a result, the counterweight truck guy line 13 is separated from the receiver 23 and the holding portion 26 and is suspended from the upper end of the mast 4. On the other hand, a counterweight truck 12 is connected to the rear end of the upper revolving body 2 by a connecting rod 14, and the lower end of the counterweight truck guy line 13 is connected to this truck 12. Thereafter, the main jib 7 is erected by winding up the main jib hoisting wire rope 7, and crane work is performed.

(Effects of the invention) As described above, the present invention enables the counterweight truck guyline to be held in the support provided on the mast guyline when assembling the crane, so that the counterweight truck guyline does not get in the way. It is something. This eliminates the need to manually operate the guy lines for the counterweight truck, reducing labor and improving work efficiency.

[Brief explanation of drawings]

1 and 2 are overall side views showing the counterbalance crane according to the present invention during and after assembly; FIG. 3 is a partial plan view thereof;
FIG. 4 is an enlarged front view of the main part. 2... Upper rotating body, 3... Main jib, 4... Mast, 9... Gantry, 10... Wire rope for mast hoisting, 11... Mast guy line, 12...
Counterweight trolley, 13... Guy line for counterweight trolley, 23... Receptacle.

Claims (1)

[Scope of utility model registration request] A main jib and a mast are installed on the upper revolving body so that they can be raised or lowered freely via a wire rope for hoisting and a guy line, and a counterweight bogie guyline hanging from the upper end of the mast is connected to the rear end of the upper revolving body. A counterbalance crane connected to a truck, characterized in that a receiver for receiving the counterweight truck guyline when the mast is tilted forward is provided between the left and right ropes of the mast guyline.