JPH0349152Y2 - - Google Patents

Description

[Detailed explanation of the invention] - Industrial application field - This invention relates to a hook attachment structure that is attached to the tip of the boom of an earth-moving machine such as a power shovel when lifting work is performed using an earth-moving machine such as a power shovel. It is.

-Technical Background- Earthmoving machines such as power shovels are used for excavating and transporting soil, but in connection with these operations, for example, they are used for pulling out sheet piles, transporting concrete blocks, and installing concrete blocks. There are many cases where lifting work such as this is required. Lifting work should, in principle, be carried out using a crane, but since it is cumbersome to prepare a crane every time a simple lifting work such as pulling out a sheet pile is required, the tip of the boom of a power shovel, etc. A device is in use that has a hook attached to the back of a bucket or bucket, allowing simple lifting work to be performed using an earthmoving machine.

-Prior Art and Problems- The simplest device of this type is one in which a hook is fixed to the tip of a boom or the back of a bucket, and the lifting operation is performed by raising and lowering the boom. However, in this structure, the direction of the load acting on the hook changes as the angle of the boom changes, which poses problems in terms of strength and safety.
There is also a device that has a hoisting drum built into the boom and performs lifting operations by hoisting wire in the same way as a normal crane, but the device is complicated and expensive, and there is a risk of damage to the hoisting device during normal earthwork work. There are some problems. Furthermore, because the conventional equipment does not have a structure to secure the bucket during lifting operations, there is a risk that the bucket may move due to incorrect operation or trouble with hydraulic piping during slinging operations, which poses problems in terms of work safety.

-Purpose of the invention- This invention was devised in view of the problems of the conventional devices mentioned above, with the aim of obtaining a device with a simple structure that can safely and reliably perform lifting work with earth-moving machines. In order to achieve the object, it is an object of the present invention to provide a mounting structure for a lifting hook that is superior in terms of strength, workability, and safety.

- Structure of the invention - This invention focuses on the fact that the tip of the boom of a power shovel, etc. has a pin for attaching a bucket, and uses this pin to easily attach a hook for lifting work. It is characterized in that it can be attached and detached, and the angle of the bucket is mechanically fixed when the hook is attached. More specifically, using the reference numerals of the illustrated embodiments, the mounting structure of the lifting hook 20 of this invention is based on a four-bar linkage mechanism 12 that supports a bucket cart 4 at the tip of a boom 3 of an earth-moving machine so as to be able to swing. Both ends of the boom-side pin 6 or 7 are extended, and the tips of a bifurcated member 22 extending from the base 21 of the hook are fitted into the protrusions 6a at both ends of the extended pin to form the hook 20.
6 and 11 or 7 and 9 at diagonal positions are connected by a fixed link 17 when the hook is attached.

-Example- The figures show one embodiment of the present invention. Fig. 1 is an overall side view showing a power shovel equipped with a hook according to the structure of the present invention, and Fig. 2 is an enlarged side view of the hook-attached part. FIG. 3 is a cross-sectional view taken along the line A--A in FIG. 2.

In the figure, 1 is a power shovel, 2 and 3 are its booms, and 4 is a bucket attached to the tip of the boom 3. The bucket 4 is pivotally connected to the tip of the boom 3 by a pin 6 through a bracket 5 fixed thereto, and is pivotally connected to the bracket 5 by a pin 9 and the tip of a link 8 which is pivotally attached to the boom 3 by a pin 7. The boom 3, the bracket 5, and the links 8 and 10 constitute a four-bar link mechanism 12. 13 is a cylinder for raising and lowering the boom 2, 14 is a cylinder for raising and lowering the boom 3, 15 is a cylinder for operating the bucket 4, and a rod 16 of the cylinder 15
is connected to pin 11. 17 is pin 6 and 1
1, and this fixed link 17 is not attached during normal earthwork work.

As shown in FIG. 3, the bracket 5 is pivotally supported by a pin 6 on the outside of the boom 3, and both ends of the pin 6 extend to the outside of the bracket 5. And a bifurcated member 2 extending from the base 21 of the hook 20
2 are pivotally attached to the extensions 6a at both ends of the pin 6. The illustrated base body 21 constitutes a so-called universal joint with pins 23 and 24 arranged orthogonally to each other, and suspends the hook 20. Two bent plates 22
The bifurcated member 22 consisting of a and 22a is pivoted to both ends of the pin 23 with a play that can be expanded as shown by the imaginary line in FIG. 25 is a spacer, 26 to 28 are end plates, and 29 to 31 are bolts for fixing the end plates 26 to 28.

When the power shovel 1 is used for normal earthwork work, the work is performed with the bifurcated member 22 and the fixed link 17 removed from the pins 6 and 11.
In this case, the only structural difference from a conventional power shovel is that both ends of the pin 6 and one end of the pin 11 are extended, and there is no problem in the earthwork work that the power shovel is supposed to do. When lifting work becomes necessary during earthwork work, pull the bucket 4 upwards as far as it will go, and remove the end plates 27, 2.
7 and 28a, expand the bifurcated member 22 and fit it into the extensions 6a and 6a on both sides of the pin 6, and install the fixed link 17 between the pins 6 and 11, and reinstall the end plates 27 and 28a. to the state shown in the figure. In this state, the hook 20 is suspended from the pin 6, and the four-bar link mechanism 12 is fixed by the fixed link 17. Then, by hooking the wire 32 to the hook 20 and raising and lowering the boom 23 using the cylinders 13 and 14, it is possible to lift the block 33 and the like.

When lifting work is performed using the hook 20, a downward lifting load acts on the booms 2 and 3.
This lifting load is supported by the hydraulic pressure of the cylinders 13 and 14, but if a hydraulic hose rupture accident occurs, there is a risk that the lifted object 33 and boom 3 will fall. In order to avoid this, a pilot check valve 3 as shown in Fig.
4 is the hydraulic pipe 3 on the rod end side of the cylinder 14.
5 so that even if the hydraulic hose 37 ruptures, the piston 38 will not move unless hydraulic pressure is supplied to the opposite side. Here, 35 and 36 are piping parts made of steel pipes, and 39 is a hose joint.
Although Fig. 4 shows the cylinder 14, a similar pilot check valve is provided in the piping on the head end side of the cylinder 13 to prevent the boom 2 from falling due to an unexpected accident. .

In the illustrated embodiment, the hook 20 is suspended from a pin 6 to which the bucket belt 4 is pivotally attached, but the hook 20 is suspended from another pin 7 attached to the boom 3. It can also be a hanging structure. In this case, fixed link 17 is attached to connect pins 7 and 9.

-Effects of the invention- According to the configuration of the invention described above, a hook for lifting work can be easily attached to the boom of an earth-moving machine such as a power shovel as necessary, and the attached hook can be attached to the boom of an earth-moving machine such as a power shovel. Regardless of the angle of the bucket, the bucket is always suspended vertically, and when the hook is attached, the movement of the bucket is fixed, ensuring safety during lifting operations, and allowing the earth-moving machine to be moved to the crane as needed. It can be used as Since this hook is removed from the boom during earthwork work, the hook does not get in the way when earthwork work is performed.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is an overall side view showing a power shovel with a hook attached, Fig. 2 is an enlarged side view of the part where the hook is attached, and Fig. 3 is an enlarged side view of the hook attached part.
The figure is a sectional view taken along the line A-A in FIG. 2, and FIG. 4 is an explanatory diagram showing a fall prevention structure of the boom raising/lowering cylinder. In the diagram, 1 is a power shovel, 2 and 3 are booms,
4 is a bucket, 5 is a bracket, 8 and 10 are links, 6, 7, 9, and 11 are pins, 12 is a four-bar link mechanism composed of these, 13 and 14 are cylinders for raising and lowering the boom, and 15 is a bucket operation cylinder,
17 is a fixed link, 20 is a hook, 21 is a base of the hook, and 22 is a bifurcated member.

Claims (1)

[Scope of utility model registration request] Both ends of the boom-side pin of the four-bar linkage mechanism, which is attached to the tip of the boom so as to be able to swing the bucket, are extended, and the tips of the bifurcated members extending from the base of the hook are connected to the protrusions at both ends of the extended pin. 1. A structure for mounting a lifting hook in an earth-moving machine, characterized in that the hook is suspended by fitting the hook into the shaft, and when the hook is mounted, pins at diagonal positions of the link mechanism are connected to each other by a fixed link.