JPS6117095Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a rock drilling machine equipped with a dust collection hood to collect dust generated during operations such as concrete scooping and brick demolition using a rock jackhammer. It's about machines.

In conventional concrete digging or brick demolition work using a rock drill, a rock drill with a dust collection hood is rarely used, and the rock drill alone is usually used. For this reason, dust is generated due to the vibration of the tip of the pick rod and the destruction of concrete or bricks, etc., or the dust accumulated around the work is scattered by the exhaust gas from the exhaust port of the rock jackhammer body. There was a problem with the poor working environment around employees.

In order to solve this problem, some methods have conventionally been used in which a fixed hood is attached around the main body of the rock drill, and the suction side of a dust collector is connected to one end of the fixed hood to collect dust. However, such a method of suctioning from one end of the hood has a small dust collection capacity, so the gap between the tip of the hood and the object to be destroyed must be made small. For this reason, the tip of the pick stick cannot be seen during work, making it difficult to work with fine details. In addition, the rock jackhammer must be lifted each time to check the state of destruction of the damaged object. Note that if the gap is made large, the dust collection efficiency will decrease, so it will be necessary to increase the suction force.

In order to solve these problems, this invention has a double ring-shaped bellows hood that extends to the tip of the pick rod by the action of exhaust gas from the rock jackhammer body, and a fixed hood that surrounds the rock jackhammer body. During rock drilling, the bellows hood is extended by using the exhaust gas from the exhaust port of the rock drilling machine and guiding the gas into the double ring of the bellows hood through a conduit. When dust is collected and rock drilling is not being performed, the bellows hood is contracted by the restoring force of a spring that applies a shrinking force to the bellows hood, making it possible to check the state of destruction and improving work efficiency.

The configuration of this invention will be explained below with reference to the drawings.

Figures 1 and 2 are cross-sectional views explaining this invention, with Figure 1 being an overall sectional view and Figure 2 being Figure 1A.
5 is a cross-sectional view of section B--B in FIG. 1. In the figure, a double-annular bellows hood 4 extending to the tip of a pick rod 3 is installed around the tip of a fixed hood 2 that surrounds a rock jackhammer body 1. giving spring 5
A plurality of (four in the figure) guide supports 6 are fixedly attached to the tip of the bellows hood 4 for guiding during expansion and contraction. The fixed hood 2 side of the bellows hood 4 is provided with a bellows hood gas supply port 7 and a bellows hood gas exhaust port 10 (FIG. 5), and the tip thereof is closed. Further, the bellows hood gas supply port 7 and the rock drill body exhaust port 8 are connected by a conduit 9, and a bellows hood gas exhaust port 10 is provided on the side opposite to the supply port 7.

Reference numeral 15 indicates damage materials such as concrete and bricks.

When a rock jackhammer is used for concrete scooping, brick demolition, etc., compressed gas is introduced from the compressed gas connection port 11 and is passed through the rock jackhammer body exhaust port 8.
Exhaust gas is discharged from the A portion of the gas is introduced into the double ring of the bellows hood 4 from the bellows hood gas supply port 7 through the conduit 9, so that the bellows hood 4 is supported by the guide support 6 with the pick rod 3 as a guide. It extends to a stopper 12 fixed to the pick rod 3 and becomes a bellows hood 4a, the tip of which approaches or comes into contact with the object 15 to be destroyed. Exhaust gas from the rock drill introduced into the double ring of the bellows hood 4a is discharged from the bellows hood gas exhaust port 10 to the fixed hood 2 and the dust collection duct connection port 14. On the other hand, the dust in the bellows hood 4a is sucked in the direction of the arrow by a dust collector (not shown) connected to the dust collection duct connection port 14. When the use of the rock jackhammer is interrupted, the exhaust gas from the exhaust port 8 of the rock jackhammer main body is no longer introduced into the double ring of the bellows hood 4a, and the bellows hood 4a is closed to the bellows hood due to the restoring force of the spring 5. The pick rod 3 is exhausted from the gas exhaust port 10 and contracts.
Since the object 15 is exposed, the condition of the object 15 to be destroyed can be confirmed.

3 and 4 show other embodiments of this invention, in which the exhaust from the bellows hood gas exhaust port 10 is passed through the exhaust conduit 13 to the dust collection duct connection port 14.
The purpose is to obtain an ejector effect at the dust collection duct connection port 14 to improve the dust capacity in the bellows hood 4a and to eliminate the need for a dust collector.

In FIG. 4, the conduit 9 is branched into the dust collection duct connection port 14 and the bellows hood gas supply port 7, and the amount of exhaust gas from the main body exhaust port 8 necessary to extend the bellows hood 4 is transferred to the bellows hood gas. By guiding the dust to the supply port 7 and the rest to the dust collection duct connection port 14, an ejector action is obtained at the dust collection duct connection port 14 in the same manner as described above, and the dust in the bellows hood 4a is sucked. When the piping is arranged in this manner, a dust collection effect equivalent to that obtained by suctioning with a dust collector can be obtained without connecting a dust collector to the tip of the dust collection duct connection port 14. This is an effective method when the working position is uncertain, such as during concrete scooping, brick demolition, etc.

In the embodiment, the expansion of the bellows hood 4 is guided by the pick rod 3 via the guide support 6, but this is because the extension of the bellows hood 4 is guided by the pick rod 3 through the guide support 6. This prevents it from sagging. Therefore, when the rock drill is used in a substantially vertical direction, or when the pressure of the exhaust gas supplied to the bellows hood 4 is increased, no guide support is particularly required.

As mentioned above, when the rock jackhammer of this invention is used for concrete scooping, brick demolition, etc., the bellows hood is automatically extended by the exhaust gas from the rock jackhammer body. Other than that, it can be automatically retracted, and the tip of the pick stick has the advantage of being easier to see, improving workability in detail. In addition, when in use, the bellows hood can be brought into close contact with the object to be destroyed, preventing dust from scattering, reducing the amount of suction air by reducing the suction opening, and exhaust gas from the rock drill body being exhausted into the bellows hood. This has the advantage of improving the working environment by preventing the scattering of accumulated dust in the surrounding area.

[Brief explanation of the drawing]

Fig. 1 is an overall sectional view explaining the present invention, Fig. 2 is an A-A sectional view of Fig. 1, Figs. 3 and 4 are an overall sectional view of another embodiment of the rock drill, and Fig. 5. is B in Figure 1.
-B sectional view. 1...Jackhammer body, 2...Fixed hood, 3...
Pick rod, 4... Bellows hood, 4a... Bellows hood when extended, 5... Spring, 6... Guide support, 7... Bellows hood gas supply port, 8... Jackhammer body exhaust port, 9... ... Conduit, 10 ... Bellows hood gas exhaust port, 11 ... Compressed gas connection port, 12 ... Stopper, 13 ... Exhaust pipe, 14 ... Dust collection duct connection port, 15 ... Destroyed object.

Claims (1)

[Scope of utility model registration request] A double annular bellows hood having a length sufficient to extend to the tip of the pit rod is provided around the tip of the fixed hood that surrounds the rock jackhammer body, and a spring is attached to the bellows hood to apply a contraction force, A rock drilling machine with a dust collection hood, further comprising a bellows hood gas supply port and a rock drilling machine body exhaust port connected by a conduit.