JPH0223637Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a hydraulic hammer used for driving concrete piles, steel pipes, steel sheet piles, etc. into the ground, which is mainly used for construction foundation work, etc. This improves the workability of replacing hardwood boards.

Conventionally, various configurations have been proposed for a so-called hydraulic hammer structure in which the hammer is raised along the inside of a cylindrical cylinder by hydraulic pressure and falls inside the cylinder when the hydraulic pressure is released.

FIG. 1 shows a specific example of this, in which an upper cylinder 1 and a lower cylinder 3 are integrally bolted together with an intermediate flange 2 interposed therebetween, and a ram having a ram guide ring 13 inside thereof. An anvil 4 is attached to the lower end of the lower cylinder 3, and an upper flange 6 with a U-packet 10 interposed is attached to the upper end of the upper cylinder 1. As a result, the ram A hydraulic chamber 14 is formed below the guide ring 13, and a hydraulic chamber 15 is formed above it.

Therefore, when hydraulic pressure is applied to the hydraulic chamber 14, the ram 1
2 is lifted upward in proportion to the amount of hydraulic pressure, and the switching valve is switched to rapidly reduce the oil in the hydraulic chamber 14 and conversely force feed it into the hydraulic chamber 15, thereby preventing the rapid descent of the ram 12. At the same time, this applies a downward impact to the anvil 4 via the hardwood board 5.

When the above-mentioned impact work is repeated, the hardwood board 5 gradually becomes damaged and eventually becomes like sawdust, and when it becomes unusable, it needs to be replaced.

When replacing the hardwood board 5, with the cylinder lifted, remove the anvil stop ring 1.
1, the anvil 4 is removed from the lower cylinder 3, the damaged hardwood board 5 placed on its upper surface is replaced with a new one, and the assembly is completed by reversing the above operations.

However, when the anvil 4 is removed, the ram 12 further descends inside the cylinder from the position shown in FIG. 1 due to its own weight, resulting in the ram 1
The second ram guide ring 13 comes into contact with the intermediate flange 2 held by the cylinder to bear the entire load.

However, since the intermediate flange 2 is not very strong, the abutting part may sag on the lower side of the inner surface and be damaged, and if this is left untreated, the degree of damage will increase at an accelerating rate. The situation worsens, resulting in damage not only to the intermediate flange 13 but also to the ram 12. It goes without saying that replacement work due to such damage to the intermediate flange requires a great deal of labor and time, and in particular, damage to the ram 12 can lead to oil leaks and poor sliding, and repair work is required. The work is also extremely difficult. In addition, since the impact force of the ram falling on the hardwood board is related to the height of the ram as it moves up and down in the cylinder, it is necessary to accurately know the height of the ram's rise in order to finely adjust the impact force. However, in the conventional structure described above, it is difficult to know the exact height of the ram's rise.

The present invention was developed to solve the above-mentioned difficulties of the conventional structure, and specifically includes a cylindrical cylinder, an anvil integrally attached to the lower end of the cylinder, and an anvil inside the cylinder. and a ram that applies a downward impact force to the anvil through a hardwood plate placed on the top surface of the anvil by repeatedly raising and falling the cylinder, and the side surface below the cylinder and close to the mounting position of the anvil. At the same time, a window for hardwood board replacement work is opened at the position, and the upper end of the cylinder covers the above-mentioned ram, and an oblong hole is provided in the vertical direction on the side surface of the cylinder. A hydraulic hammer characterized in that a protective cover with scales arranged at regular intervals is attached, and a ram position display plate is fixed to the upper end of the ram in correspondence with the oblong hole of the protective cover. Regarding.

The specific content of the present invention will be explained below based on an embodiment shown in Figure 2 and below.
1 is the upper cylinder, 23 is the lower cylinder, 3
2 indicates ram.

The upper cylinder 21 has a U packing 29 on the inner peripheral surface.
The upper end of the lower cylinder 23 having a housing 27 is integrally bolted to the upper end of the lower cylinder 23 with an intermediate flange 22 protruding from the middle flange 22 interposed therebetween. housing 28 with 26 interposed therebetween;
are integrally bolted together.

On the other hand, the lower cylinder 23 is provided with a window 46 that opens outward, and a support member 47 is attached to the upper opening edge of the window 46, and a thick rubber plate 48 is screwed to the support member 47. Only its upper end portion is supported by the support member 47.

Lower cylinder 23 avoiding the window 46 part
The outer periphery of the lower cylinder 23 has a double structure in which the periphery is covered with a soundproof wall 44, and the space formed between the outer periphery of the lower cylinder 23 and the soundproof wall 44 is filled with sand 45 over the periphery. There is.

Furthermore, an anvil 24 on which a hardwood board 25 is mounted is fitted to the lower end of the lower cylinder 23, and is integrally attached to the peripheral surface of the anvil 24 with bolts 36 via an anvil stop ring 31.

The ram 32 has a ram guide ring 33 protruding toward the outer circumference at approximately the center thereof, and is configured to move up and down while sliding on the inner circumferential surface of the upper cylinder 21 described above. The U gasket 29 of the intermediate flange 22 is in sliding contact with the guide ring 33 on the lower side, thereby forming a hydraulic chamber 34, and the U gasket 30 of the upper flange 26 is on the upper side. Sliding contact,
A hydraulic chamber 35 is thereby formed.

Furthermore, 39 indicates a ram stopper that is integrally attached to the upper end of the ram 32 by a bolt 40.
As a result, the ram 32 reaches its lowering limit within the cylinder, and before the ram guide ring 33 contacts the intermediate flange 22, the receiver provided on the upper flange 26 The upper flange 26 abuts against the plate 28a.
As a result, the entire load of the ram 32 is supported by the upper end of the upper flange 21. Reference numeral 42 indicates a protective cover, on one side of which an oblong hole 43 is provided in the vertical direction, and scales are provided at regular intervals along the oblong hole 43. Ram 32 protruding above cylinder 21
In order to completely cover the ram stopper 39, the base end of its peripheral surface is bolted and fixed to a receiving plate 28a provided on the upper surface of the upper flange 26.

Incidentally, reference numeral 41 indicates a ram position display plate fixed to the ram stopper 39 in correspondence with the oblong hole of the protective cover.

Further, a rotary body 49 for attaching an attachment is integrally fixed to the lower surface of the anvil 24 by bolting.
9 has thrust bearing 50, distance 5
1. A tightening nut 52 and a locking key 53 are built in, and a chuck attachment 54 attached to the lower side thereof is held rotatably in the axial direction.

In the above configuration, a hydraulic switching valve (not shown) is connected to a pipe 38 connected to an oil storage tank (not shown).
When oil is force-fed into the hydraulic chamber 34 through a pipe 37 leading to a hydraulic pressure supply circuit interposed therebetween, the ram 32 rises within the cylinder in proportion to the amount of hydraulic pressure.

After raising the ram 32 to a predetermined height while confirming the rising position of the ram position display plate that rises along the oblong hole 43 of the protective cover 42, the hydraulic pressure switching valve is switched to check the position of the ram position display plate in the hydraulic chamber 34. The oil is allowed to escape from the pipe 37 to the outside, and conversely, a sudden hydraulic pressure is applied to the upper hydraulic chamber 35 to cause the ram 32 to fall.

The falling ram 32 hits the hardwood board 25 due to its acceleration.
, thereby transmitting the downward impact force of the full load of ram 32 to chuck attachment 54 .

In this case, it is more effective to keep the amount of rise of the ram constant at all times, or to automatically control the generation of a stop signal for continuous operation when the lower limit of the ram is exceeded, using a separate automatic control device.

Since the present invention is as described above, in particular, by opening the window on the side of the lower cylinder,
When the hardwood board becomes damaged due to the use of the hammer device over time and needs to be replaced, the work can be easily done through the above window, eliminating the need to remove the anvil and the associated disassembly. There is no risk of damage or deformation of the ram guide ring or intermediate flange during work, and even if the anvil needs to be removed,
At the lowest point of the ram, the ram stopper contacts the upper end of the upper cylinder via the upper flange or receiving plate and supports the entire load of the ram, so that the ram guide ring or intermediate flange will not be damaged or deformed at all. do not have. In addition, by attaching a thick rubber plate or other plastic member to the window opening with only one edge supported, the impact noise generated during hammering work is significantly attenuated, resulting in soundproofing. At the same time, it is possible to prevent hardwood chips and lubricating oil inside the cylinder from scattering to the outside. Furthermore, a protective cover is attached to the upper end of the cylinder to cover the ram, and furthermore, an oblong hole is provided in the vertical direction on the side surface of the cylinder, and a scale is marked at regular intervals along the oblong hole. Moreover, since a ram position display plate is fixed to the upper end of the ram in correspondence with the oblong hole of the protective cover, the rising height of the ram can be checked at all times during hammer work, and this makes it possible to reduce the impact force. This provides various beneficial effects such as the ability to easily perform fine adjustments.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of a conventionally known hydraulic hammer device, FIG. 2 is a half-cut sectional view of a hydraulic hammer device that is an embodiment of the present invention, FIG. 3 is a partially enlarged sectional view of a protective cover, and FIG. 4 is a side view of FIG. 3, FIG. 5 is an enlarged cross-sectional view taken along line A--A in FIG. 2, and FIG. 6 is an enlarged view of portion B in FIG. 2. 21... Upper cylinder, 22... Middle flange, 23... Lower cylinder, 24... Anvil, 25... Hardwood board, 26... Upper flange, 2
8a... Reception plate, 32... Ram, 33... Ram guide ring, 34, 35... Hydraulic chamber, 39... Ram stopper, 41... Ram position display plate,
42...Protective cover, 43...Oval hole, 44...
Soundproof wall, 45...sand, 46...window, 48...rubber plate, 49...rotating body for attaching attachment.

Claims (1)

[Scope of utility model registration request] A cylindrical cylinder, an anvil integrally attached to the lower end of the cylinder, and a downward impact on the anvil through a hardwood board placed on the top surface of the anvil by repeatedly rising and falling within the cylinder. A window for hardwood board replacement work is opened at a side position below the cylinder and close to the anvil mounting position, and the upper end of the cylinder covers the ram, Furthermore, an oblong hole is provided in the vertical direction on the side surface of the ram, and a protective cover is attached along the oblong hole with graduations at regular intervals, and the protective cover is attached to the upper end of the ram. This hydraulic hammer is characterized by a fixed ram position display plate that corresponds to the oblong hole.