JPH0223636Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a hydraulic hammer used when driving concrete piles, steel pipes, or steel sheet piles into the ground, which are mainly used for construction foundation work. By completely preventing partial damage that is likely to occur when replacing parts, functional deterioration can be prevented, and hammer work can be improved by setting limits for raising and lowering the hammer and taking measures to ensure that these limits are not exceeded. The aim is to improve efficiency and safety, and further expand the scope of application.

Various configurations have been proposed in the past regarding the so-called hydraulic hammer structure in which the hammer is raised by hydraulic pressure along the inside of a cylindrical cylinder 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. 12 is fitted in a vertically movable manner, 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, A hydraulic chamber 14 is formed below the ram 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, press the anvil stop ring 11.
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 performing the reverse operation described above.

However, when the Albin 4 is removed, the ram 12 further descends inside the cylinder from the position shown in FIG. The entire load will be supported by contacting the

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 2 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 time and effort, and damage to the ram 12 in particular leads to oil leaks and poor sliding, and repair is extremely difficult. Have difficulty.

Furthermore, when transporting the hammer device described above, the upper end of the ram 12 is always exposed and is easily damaged, and as a result of the fact that various dust and dirt adhere to the exposed portion, it is difficult to use it as is. In this case, the U-packet 10 of the upper flange 6
It often caused damage to the body.

Furthermore, the hydraulic hammer with the configuration shown in Figure 1 has a structure in which the anvil 4, which has a flat bottom surface, is simply fixedly held on the lower cylinder 3, so it is mostly applicable only to the casting of steel pipes and concrete piles. Because it was not possible to do so, there were some problems in terms of applicability.

The present invention was developed in order to solve the various problems mentioned above with the conventional technology. A striking ram, which is integrally provided with a ram stopper at the upper end of the ram, which is capable of supporting the ram by abutting against the upper end of the cylinder or an upper flange attached to the upper end of the cylinder when the ram is at its lowest position. The present invention attempts to provide a hydraulic hammer characterized by the following features.

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 placed is fitted to the lower end of the lower cylinder 23, and is integrally attached to the circumferential 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 which is integrally attached to the upper end of the ram 32 by a bottle 40, and a part of the ram stopper 39 protrudes in the outer circumferential direction beyond the cross-sectional diameter of the ram 32, so that the ram 32 When the lower limit point is reached in the cylinder, the ram guide ring 33 contacts the receiving plate 28a provided on the upper flange 26 before it contacts the intermediate flange 22, and the ram guide ring 33 contacts the receiving plate 28a provided on the upper flange 26. It is designed to support the full load of 32.

Reference numeral 42 indicates a protective cover, on one side of which an oblong hole 43 is provided in the vertical direction;
The protective cover 42 has a proximal end of its peripheral surface on the upper surface of the upper flange 26 in order to completely cover the ram 32 and ram stopper 39 that protrude above the upper cylinder 21. It is bolted and fixed to the provided receiving plate 28a.

Note that 41 indicates a ram position display plate fixed to the ram stopper 39.

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 built-in tightening nut 52 and locking key 53,
A chuck attachment 54 attached to the lower side is held rotatably in the axial direction.

In the above configuration, when oil is force-fed into the hydraulic chamber 34 from the pipe 38 connected to an oil storage tank (not shown) and the pipe 37 leading to a hydraulic pressure supply circuit with a hydraulic switching valve (not shown) interposed, the oil pressure is proportional to the amount of hydraulic pressure. The ram 32 then moves up inside the cylinder.

In this case, the rising dimension of the ram is an important factor that determines the amount of work in one hammering, and is important in stabilizing the overall amount of work, speeding up the work time, and calculating the estimate of the total work time. Since it is valid, the ram position display plate 4
1 through the oblong hole 43 provided in the protective cover 42 along the scales displayed on both sides of the ram, and the operator visually confirms the amount of rise of the ram while raising the ram.

In this case, if it rises excessively, it will cause damage to the ram 32 and the upper flange 21.

After the ram 32 has been raised to a predetermined height, the oil pressure switching valve is switched to release the oil in the hydraulic chamber 34 outward from the pipe 37, and conversely, the oil in the upper hydraulic chamber 35 is suddenly released. Hydraulic pressure is applied 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 addition, knowing the descending dimension of the ram in this case is important in order to detect in advance the degree of wear and tear on the hardwood, and if left unattended, there is a risk that both the ram and the anvil will become unusable due to deformation, damage, etc.

For this purpose, the operator must use the ram position display plate 41.
It is necessary to check the lower limit dimensions.

It is more effective if the amount of rise of the ram is always constant, or if a separate automatic control device automatically controls generation of a stop signal for continuous operation when the limit of ram fall is exceeded.

When the hardwood board 25 of the hammer device is damaged due to use over time and needs to be replaced, the replacement work is carried out through the window 46 opened in the side of the lower cylinder 23, and the anvil 24 needs to be repaired. If this occurs, with the cylinder lifted, loosen the bolt 36, remove the anvil stop ring 11, and remove the anvil 24 from the lower cylinder 23. At this time, the ram 32 descends further inside the cylinder, but when it reaches its lowest point, the outer peripheral edge of the ram stopper 39 is connected to the receiving plate 38a provided on the upper surface of the upper flange 6.
The ram 32 comes into contact with the upper surface, and the entire load of the ram 32 is supported by the upper end of the upper cylinder 21 and then stopped.

After completing the repair work, the assembly is completed by performing the reverse operation described above.

As mentioned above, the present invention has a ram stopper integrally provided at the upper end of the ram that can abut the upper end of the cylinder when the ram is at its lowest point and support the ram. During disassembly work, it prevents deformation damage to the lower inner surface of the intermediate flange due to contact between the ram guide ring and the intermediate flange, and damage to the ram itself.It also prevents sliding failures due to oil leaks and deformation, making it heat resistant. In addition, it has various beneficial effects such as reducing work interruptions, shortening construction periods, and reducing maintenance fees.

[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. The figure is a side view of figure 3,
The figure is an enlarged 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)

[Claims for Utility Model Registration] (1) A striking ram that is raised by hydraulic pressure in a cylindrical cylinder and allowed to fall naturally when the hydraulic pressure is released, and the upper end of the ram has a ram. A hydraulic hammer characterized by being integrally provided with a ram stopper that can come into contact with the upper end of the cylinder and support the ram when it is at its lowest point. (2) In the utility model registration claim described in paragraph 1, the upper flange and receiving plate of the cylinder are interposed at the upper end of the cylinder that supports the ram stopper provided integrally at the upper end of the ram. Hydraulic hammer.