JPS6016631Y2 - Boom head structure - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a boom head for a crane, in which a boom can be attached to the tip of the boom.

For some types of medium-sized cranes, cargo handling operations are carried out by hanging the main hook from the crane boom (Figure 3 a), and cargo handling operations are carried out by hanging the secondary hook from the foot boom attached to the tip of the boom (Figure 3 b). The main hook can be fixed to the boom head and the wire rope wrapped around the main hook can be used to change from the working posture shown in figure a to the working posture shown in figure 2. Pass the tip of the wire rope through the boom head and take it forward to guide it to the tip of the connecting boom.To change the working position from the working position shown in Figure A to the working position shown in Figure A, pass the end of the wire rope through the boom head again. Make sure to attach it to the bottom of the boom head.

In order to improve work efficiency, it is strongly desired that this work of threading the wire rope be as simple as possible.

(Prior Art) Conventionally, there has been a technique in this field as seen in Japanese Utility Model Publication No. 46-34510.

As shown in FIG. 4, the end of the wire rope 7 is pin-connected to the lower surface of the boom head 4 at a proper location using a cable end fastener 9.

In general, the boom head 4 is designed to have sufficient strength because the weight of the load suspended by the hook directly acts on it, and therefore the front and rear dimensions of the box structure are designed to be the minimum required. There is almost no internal space other than the space where the sheave is attached and the wire rope is passed through.

Therefore, the wire rope threading work that accompanies the change in working posture between FIGS. 3a and 3b described earlier must be performed with only the wire rope 7 with the rope end stopper 9 removed, as shown in FIG. did not become.

To remove the cable end upper metal fitting 9, as shown in FIG. The process of replacing the wire rope was very inefficient, as it required a lot of effort and man-hours to pull out the wire rope and reassemble it.

(Problems to be Solved by the Invention) Therefore, the present invention attempts to provide a boom head that allows wire ropes to be rehanged without disassembling and reassembling the cable end fasteners.

(Means for solving the problem) The present invention has a boom head that is a box-like structure that is installed at the tip of the crane boom and allows a connecting boom to be mounted forward. Equipped with an upper sheave that is pivoted at an upper position and a plurality of lower sheaves that are pivoted at a lower position inside the same, the wire rope is guided by the upper sheave and guided from the upper end opening of the boom head, and is connected between the lower sheave and the hook sheave. Then turn the hook to any number of hooks to hang the main hook, and let the wire rope still hooked to the hook sheave be guided by the lower sheave to the tip of the extension boom, and from there attach the secondary hook. In a suspended boom device, there is an opening in the front of the boom head and a bracket near this opening, so that when carrying out cargo handling operations using the extended boom, the wire rope is guided through the opening to the tip of the extended boom, allowing for cargo handling using the crane boom. During work, the wire rope is passed through the opening, and the end stopper at the end of the wire rope can be removably connected to the bracket with a pin.

(Function) Therefore, in the present invention, when the wire rope end is fixed to the bracket, the cable end stopper is located outside the boom head, and when changing the wire rope, the inside of the boom head cannot be removed. There is no need to go through it.

This eliminates the need for disassembly and assembly of the cable end fastener.

(Example) An embodiment of the present invention will be explained based on FIGS. 1 and 2.

Figure 1 shows the cargo handling position using the crane boom.

Reference numeral 1.2 denotes a base boom and a tip boom that constitute the crane boom, and a boom head 4 is provided at the tip.

The boom head 4 is a hollow cubic box-like structure with open upper and lower end surfaces, and an upper sheave 5 is pivotally attached to the upper position.
A plurality of lower sheaves 6 are pivoted at the lower position.

Further, an opening 11 is formed on the front side, and a bracket 12 is attached to the side of the opening 11.

Reference numeral 13 denotes a bracket for connecting the leg boom 3.

The wire rope 7 let out from a winch (not shown) provided at the base end of the boom is guided by the upper sheave 5 and guided into the boom head 4, and is further passed between the lower sheave 6 and the hook sheave 8'. The main hook 8 is hung by rotating the hook, and its end is fixed by connecting the cable end fitting 9 to the bracket 12 with a pin.

In this state, the end portion of the wire rope 7 is in a position passing through the opening 11 via the lower sheave 6.

When the winch is wound and unwound in this state, the main hook 8 rises and falls, and the cargo handling operation shown in FIG. 3a is performed.

FIG. 2 shows the cargo handling posture using the extended boom 3.

The leg boom 3 is attached to the front of the boom head 4 by connecting its base to a bracket 13 with a pin.

In this working posture, the wire rope 7 is pulled out by pulling out the pin from the bracket 12, removing the cable end stopper 9, and pulling it forward. Then, the wire rope 7 is hooked onto the sheave 14 at the tip of the connecting leg boom 3, and the sub hook 10 is connected with the pin. and hang it.

In addition, when this cargo handling posture is used, the main hook 8 is brought into contact with the lower surface of the boom head 4 by appropriate means and restrained.

When the winch is wound and rewinded in this state, the secondary hook 1
The cargo handling work shown in Figure 3 is carried out by No. 0.

In addition, in order to shift from this state to the cargo handling position shown in FIG.
This can be done by connecting the pins to the

As described above, according to this embodiment, the wire rope 7 is rehanged outside the boom head 4, and there is no need to pass it through the boom head 4, so that disassembly and assembly of the cable end fastener 9 is also not necessary, and can be performed quickly.

It should be noted that the extension boom 3 can be handled in the same way whether it is attached to the front of the boom head 4 or attached to the upper part of the boom head 4.

(Effects of the invention) According to the invention, the work of rehanging wire ropes is extremely simple because it does not require the effort of disassembling and assembling the rope end fasteners, and the efficiency of crane work can be improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view of main parts showing cargo handling work using the boom according to the embodiment of the present invention, Fig. 2 is a cross-sectional front view of main parts showing cargo handling work using the boom with extended legs according to the embodiment of the present invention, and Fig. 3 is a cross-sectional front view of main parts showing cargo handling work using the boom of the present invention. Figure 4 shows the structure of the boom head of the conventional example, and Figure 5 shows the wire during the wire rope change of the conventional example. FIG. 6 is a diagram showing the rope threading work, and is a diagram for explaining the number of steps required to disassemble the rope end fastener. 1.2... Crane boom, 3... Extension boom, 4... Boom head, 5...
・Upper sheave, 6...Lower sheave, 7...
・・Wire rope, butt・・・Main hook, 9・・・・
... Cable end fastener, 10 ... Secondary hook, 11 ...
...Opening, 12...Bracket.

Claims (1)

[Claim for Utility Model Registration] A boom head 4 is provided at the tips of the crane booms 1 and 2 and is a box-like structure to which a connecting boom 3 can be attached in the forward direction. It is equipped with an upper sheave 5 pivoted at an upper position and a plurality of lower sheaves 6 pivoted at a lower position inside the same, and a wire rope 7 is guided by the upper sheave 5 from the upper end opening of the boom head 4, and the lower sheave 6 and the hook sheave 8' so that the main hook 8 is suspended, and the wire rope 7, which is still hooked on the hook sheave 8', is guided to the lower sheave 6. In the boom device which is guided to the tip of the extended boom 3 and from which the sub-hook 10 is suspended, an opening 11 is provided in the front of the boom head 4 and a bracket 12 is provided near this opening, so that cargo handling by the extended boom can be carried out. During work, the wire rope 7 is guided to the tip of the leg boom 3 through the opening 11. During cargo handling work using a crane boom, the wire rope 7 is passed through the opening 11 and the cable end stopper 9 at the tip is connected to the bracket 12. A boom head structure characterized by a pin connection that can be detachably attached to the boom head.