JPH027950Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a hydraulic hammer that pushes up the ram by supplying hydraulic pressure to the ram drive hydraulic cylinder and drives the pile by dropping the ram, which can set piles of various outside diameters. The present invention relates to the structure of a cap equipped with an adapter.

To explain the outline of a typical hydraulic hammer with reference to FIG. 1, a ram 3 is housed in a casing 1 that is movable up and down along a leader (not shown) of a pile driver, and is housed in a casing 1 that is movable up and down. When pressure oil is supplied from a hydraulic source (not shown) to the lower chamber of the piston of the hydraulic cylinder 2 provided outside the case or inside the case as shown, the ram 3 is pushed up, and the lower chamber of the piston is connected to the oil tank ( (not shown) and the upper chamber of the piston to drain the oil, the ram 3 falls freely and drives a stake 9 through a cap 4 having cushions 7 and 8 on the upper and lower surfaces. 5
A rubber ring is interposed as a cushioning material between the casing 1 and the cap 4, and a soundproof cover 6 also serves as a stopper to prevent the cap 4 from falling down.

In such a hydraulic hammer, the cap 4
is the cylindrical part 4a so that the largest diameter pile 9 can be set.
As shown in FIG. 2, when setting a narrow diameter stake 9', an adapter 10 is interposed between the cap 4 and the stake 9'. This conventional adapter 10 includes a cylindrical portion 10a having an inner diameter slightly larger than the outer diameter of the pile 9', and is provided so as to close one end of the cylindrical portion 10a, and is slightly larger than the cylindrical portion 4a of the cap 4. Ceiling board 10b with a small outer diameter
A cushion 12 is fitted inside. Further, a stopper 11 made of a bolt is attached to the cylindrical portion 4a of the cushion 4 to prevent the adapter 10 from falling.

In a cap structure having such a conventional adapter 10, a cushion 12 inside the adapter 10 is newly added in addition to the cushion 8 between the pile 9' and the cap 4, so that the impact energy loss of the ram 3 is reduced. As the cushion 12 becomes larger and the impact force becomes smaller, and the cushion 12 is a consumable item,
In addition, the adapter 10 is expensive and
Since the cushion 0b is fitted into the cylindrical portion 4a of the cushion 4 and interposed between the cushion 4 and the stake 9', there is a drawback that it rattles when struck.

The purpose of the present invention is to eliminate the drawbacks of the conventional cap structure having an adapter as described above, and to provide a cap structure for a hydraulic hammer that reduces the loss of striking energy, is inexpensive, and does not cause rattling during striking. shall be.

In order to achieve this purpose, the cap structure of the present invention is designed such that the inner diameter of the cylindrical part of the adapter into which the pile is inserted is set slightly larger than the outer diameter of the corresponding pile, and the cylindrical part has an opening on the upper and lower surfaces without a ceiling plate. With this structure, the top of the stake inserted into the cylindrical part is brought into contact with the lower cushion of the cap, and the adapter is detachably attached to the cap so that the adapter is substantially fixed to the cap. It is characterized by having been installed.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 3, reference numeral 13 is an adapter, and the inner diameter of the cylindrical portion 13a of the adapter is slightly larger than the outer diameter of the pile 9' to be driven.
A has a top and bottom opening structure without a ceiling plate, and has a structure in which the top of the stake 9' inserted into the cylindrical part 13a comes into contact with the cushion 8 below the cap, which is fitted into the cylindrical part 4a of the cap 4. have The cylindrical part 13a
A flange 13b, which has an outer diameter slightly smaller than the inner diameter of the cylindrical part 4a of the cap 4 and is tightly fitted into the cylindrical part 4a, is formed at the upper end, and a flange 13b is formed at the lower end of the cylindrical part 13a. A flange 13c having an outer diameter approximately the same as that of the flange 4b formed at the lower end of the flange 13c is formed, and these flanges 4b, 1
Insert the bolt 14 into the bolt insertion holes 4c and 13d provided in corresponding positions of the bolt 3c and tighten the nut 18.
By screwing the adapter 13 into the cap 4, the adapter 13 is removably attached to the cap 4. When the adapter 13 is attached to the cap 4, the flange 13b at the upper end of the adapter 13 is brought into contact with the cushion 8, thereby preventing the cushion 8 from protruding from the cylindrical portion 4a during impact.

In this manner, the cylindrical portion 13a of the adapter 13 is made to have an open top and bottom structure, and the top of the stake 9' inserted into the cylindrical portion 13a is brought into contact with the cushion 8 fitted into the cylindrical portion 4a of the cap 4. , the cushion 12 attached to the conventional adapter 10 is no longer required, the loss of impact energy is reduced accordingly, and piling work can be carried out efficiently. Furthermore, since the number of consumable cushions is reduced from three to two, the cost associated with the use of the pile driver is reduced, and the effort required to replace the cushions is also reduced. Furthermore, by fixedly attaching the adapter 13 to the cap 4 with the bolt 14 and nut 18, there is no looseness during impact, and the guide action of the cap 4 on the pile 9' is performed well. In particular, as in this embodiment, by tightly fitting the flange 13b at the upper end of the adapter 13 into the cylindrical portion 4a of the cap 4, the adapter 13 can be attached to the cap 4.
Since it is firmly fixed, wobbling is effectively prevented.

FIG. 4 shows another embodiment of the present invention, in which the adapter 15 of this embodiment has a cylindrical portion 4a of the cap 4 that fits tightly onto the upper and lower ends of a cylindrical portion 15a having an inner diameter slightly larger than the outer diameter of the stake 9'. Flanges 15b, 15 that fit tightly
c, and a flange 4b formed at the lower end of the cylindrical part 4a has an outer diameter that is approximately the same as the outer diameter of the flange 4b, and an inner diameter that is slightly smaller than the inner diameter of the cylindrical part 4a. The stopper 16 is attached by inserting the bolt 14 into the bolt insertion hole 4c, 16a provided at the corresponding position of the flange 4b and the stopper 16 and screwing it into the nut 18, and the adapter 15 is supported by the stopper 16. By doing so, the adapter 15 can be attached to the cap 4 in a substantially fixed manner. The stopper 16 is commonly used by various adapters having different diameters.

According to this embodiment, it is possible to achieve the same effects as those of the above-mentioned embodiments, and also to use various adapters 15.
By sharing the stopper 16 as a fixing means, the structure of the adapter 15 becomes simple, the price of the adapter is reduced, and since the adapter 15 is miniaturized, it is easy to handle.

The hydraulic hammer to which the present invention is applied may be of any type as long as the ram 3 rises by supplying pressure oil to the hydraulic cylinder and falls by removing oil. , the ram 3 may also serve as a piston of a hydraulic cylinder.

As described above, according to the present invention, since a cushion for an adapter is not required, the loss of impact energy is reduced accordingly, and piling work can be carried out efficiently. Furthermore, since the number of consumable cushions is reduced, the cost associated with the use of the pile driver is reduced, and the effort required to replace the cushions is also reduced. Furthermore, since the adapter is fixedly attached to the cap, there is no wobbling during impact, and the cap provides good guidance to the pile.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a hydraulic hammer explaining the conventional cap structure, Fig. 2 is a sectional view of the hydraulic hammer showing the conventional cap structure with an adapter attached, and Fig. 3
The figure is a cross-sectional view of a hydraulic hammer showing one embodiment of the cap structure according to the present invention, and FIG. 4 is a cross-sectional view of a hydraulic hammer showing another embodiment of the cap structure according to the present invention. 3... Ram, 4... Cap, 4a... Cylindrical part, 7,
8...Cushion, 9,9'...Pile, 13,15...Adapter, 13a, 15a...Cylindrical part.

Claims (1)

[Scope of utility model registration request] In the cap structure of a hydraulic hammer equipped with an adapter having cylindrical parts of various inner diameters that allow piles of various outer diameters to be set, the inner diameter of the cylindrical part of the adapter is set slightly larger than the outer diameter of the corresponding pile. In addition, the cylindrical part has a top and bottom opening structure without a ceiling plate, so that the top of the stake inserted into the cylindrical part comes into contact with the lower cushion of the cap, so that the adapter does not touch the cap. A cap structure for a hydraulic hammer, characterized in that an adapter is removably attached to the cap so as to be substantially fixed.