JPH0212064Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field This invention relates to the prevention of internal corrosion of hydraulic breakers used underwater.

(2) Conventional technology Hydraulic breakers are used to dismantle and crush underwater bridge piers and rocks, and this breaker for use underwater (called an underwater breaker) is known in Japanese Utility Model Publication No. 52-32721, Japanese Patent Publication No. 58-34272, etc. By modifying an ordinary hydraulic breaker, the cavity formed in the piston and chisel striking part can be communicated with the atmosphere, or compressed air can be introduced into the cavity to remove water from the gap between the peripheral wall between the chisel holder and the chisel at the lower end of the breaker. This prevents dirt and mud from entering.

(3) Problems to be solved Conventional underwater breakers are designed to prevent water from entering through the chisel attachment part at the bottom of the breaker, and to prevent rust and corrosion of the internal mechanism. However, the breaker body consists of several parts divided into upper and lower parts, and these parts are tightened and connected together with long side bolts, so the joint surfaces of each part are precisely inspected and the appearance is fine. Although it looks like they are in close contact, there is actually a tiny gap. Therefore, when used underwater, water can enter through minute gaps. Furthermore, the loosening of the side bolts due to the violent impact movement of the breaker promotes water infiltration through the gaps between the joints between parts, and over time the bolts and joint surfaces become corroded and pitted, reducing the life of the machine.

To prevent this, various measures were taken, such as inserting plate-shaped rubber gaskets at each joint and making each part from a corrosion-resistant alloy containing Cr, Al, Si, etc.
None of these methods have been put into practical use due to problems such as difficulty in processing and assembly and material costs.

(4) Means to solve the problem This idea is to provide a lubrication port that leads to the through hole into which each side bolt is inserted, in the head or the top of the cylinder, and to pump oil such as grease through this lubrication port. By filling the bolt through hole with oil and infiltrating the joint, the structure prevents water from entering the joint gap from the outside when using the breaker underwater. The present invention solves the problems and provides an underwater breaker that is easy to assemble and maintain, and is inexpensive.

(5) Action This breaker is operated underwater to crush submerged concrete foundations and rocks, but the parts where water enters the breaker body, that is, the joints of each part, are subject to infiltration of oil and fat filled in the bolt through holes. As a result, the gap between the chisel fitting portions is sealed by the compressed air introduced into the striking chamber, and water and sludge do not enter into the breaker.

(6) Embodiment Next, an embodiment of this invention will be described based on the attached drawings.

Fig. 1 is a partially cutaway front view of the underwater breaker of this invention, Fig. 2 is an enlarged cross-sectional view of Fig. 1;
FIG. 3 is a longitudinal sectional view of the main part of FIG. 1.

In the figure, 1 is a breaker body housing a striking mechanism therein, 4 is a head cap, 5 is a cylinder, 6 is an impact ring, and 7 is a chisel holder. These are integrally connected by long side bolts 9 which are passed through the vertically formed through holes 8. To fasten the side bolts, use nut 10 at the lower end, washer 11 and nut 1 at the upper end.
This will be done at 4. During use, fit the rotation stopper 12 to prevent the nut 14 from loosening, and then tighten the lock ring 1.
Fix it at 3.

The chisel 3 is fitted into the inner hole of the chisel holder 7 at the lower part of the breaker with a pin 15 so as to be vertically movable, and the reciprocating piston 2 strikes the upper end of the chisel. 16
is an annular striking cavity formed in the striking part of the piston and chisel in the breaker, and this cavity 16 has a communication hole 18 that communicates with a compressed air inlet 17 from outside the breaker.

19 is an oil filler port 20 that communicates with the bolt through hole 8. The oil filler port 20 may be provided for each bolt through hole, but as shown in FIG. Alternatively, the oil inlet can be provided at only one location and all the through holes can be connected through pores.

Although the explanation has been omitted, the internal mechanism of the breaker is suitably sealed liquid-tight as is conventionally known.

The underwater breaker of this invention has the above structure, and when assembling the breaker, oil such as grease is applied to the end faces of the joints a, b, c, d, e, and f of each part, and the side bolts are attached. After assembling them together, oil is filled into the bolt through hole 8 from the oil filler port.

Next, to explain the operation of the breaker, first connect an air hose to the air inlet 17 and supply compressed air from the compressor.
8 into the striking cavity 16 and is discharged from the lower end of the breaker through the gap between the chisel and the chisel holder.

After this condition is reached, the breaker is placed in the water, and the breaker is activated to destroy rocks and structure foundations.

(7) Effects In the underwater breaker of this invention, water intrusion from the gap between the chisel fitting parts is prevented by the compressed air supplied to the striking chamber, and the joints a to f of each part are
is tightly sealed by the grease applied during assembly and the oil that fills the bolt through hole, preventing water from entering from the outside, preventing rust and corrosion caused by water at the joints of each part and the internal mechanism of the side bolt. prevented,
Seizure, breakage, etc. caused by this are reduced, and the life of the breaker is extended.

Furthermore, compared to methods using plate-shaped packing or expensive corrosion-resistant materials, processing and assembly are easier and costs are lower.

Daily maintenance can be easily and quickly performed by simply adding oil from the oil filler port, and internal corrosion will not occur even if the product is stored for a long period of time after use.

Furthermore, since it can be operated on land after being taken out of the water, it has the effect of enabling efficient work at the water's edge, such as near seawalls.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the underwater breaker of the present invention, FIG. 2 is a sectional view, and FIG. 3 is a vertical sectional view of the main part. 1... Breaker body, 2... Piston, 3...
Chisel, 4...Head cap, 5...Cylinder, 8...Bolt through hole, 9...Side bolt,
16...Empty impact chamber, 17...Air inlet, 19...
...Plug, 20...Oil filler port, 21...Pore, a,
b, c, d, e, f...junction.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a breaker in which each member such as a head cap, cylinder, impact ring, chisel holder, etc. is integrally connected by a plurality of side bolts penetrating in the vertical direction, the impact chamber in the cylinder is In addition to supplying compressed air, an oil filler port communicating with the through holes for inserting the side bolts is provided in the upper part of the breaker, and each of the through holes is filled with oil and fat to make it watertight. Underwater breaker. (2) The underwater breaker according to claim 1 of the utility model registration, which has one or two oil fill ports and each through hole is communicated with each other through a small hole. (3) The underwater breaker according to claims 1 and 2 of the utility model registration claim, in which the oil filler port is provided in the head cap part. (4) The underwater breaker according to claims 1 and 2 of the utility model registration claim, in which an oil filler port is provided at the top of the cylinder.