RU92909U1 - PNEUMATIC HAMMER - Google Patents

Abstract

 1. A pneumatic jackhammer comprising a handle fixed movably relative to the barrel through an intermediate link, a valve, an annular chamber formed by an internal bore in the intermediate link and an air distribution mechanism, a muffler casing with holes connected to the handle and enclosing the barrel from the outside with a gap, an impactor, dividing the Central channel of the barrel on the camera working and idling, and a sleeve located on the barrel, characterized in that the end face of the sleeve on the side of the handle is rigidly mounted on the barrel, and the sleeve is provided with holes. ! 2. The hammer according to claim 1, characterized in that the holes in the sleeve are made perpendicular to the axis of the barrel. ! 3. The hammer according to claim 1, characterized in that the holes in the sleeve are located under the muffler.

Description

The utility model relates to mining and construction, in particular, to pneumatic hammers for the destruction of rock and concrete.

Known pneumatic hammer (RF patent №2127365 IPC Е21С 37/24), comprising a housing with exhaust openings on the handle side, a drummer, a muffler casing with an inner shoulder (ring sleeve) and inclined through grooves in the sleeve, a cap with an annular volume limited by a housing , a working tool with a device for holding it relative to the housing, an intermediate casing with an inner collar (ring sleeve) and inclined through grooves in the sleeve, forming counter grooves in the grooves in the sleeve of the muffler casing, is installed the first between the cover - muffler and cap.

The disadvantage of this hammer is: firstly, the exhaust air is exhausted only through the muffler casing, as a result of which the air flows in the bushing channels have high speeds, i.e. possesses great internal energy; secondly, the inner annular volume of the cap when filling with air from the intermediate casing is not filled effectively enough, since the counterflow counterflows against the outlet flow into the annular chamber of the cap, that is, the counterflow of air, having a relatively small internal energy, cannot create conditions for crushing and weakening the air flow from the muffler casing.

Known pneumatic jackhammer (RF patent No. 46812 IPC Е21С 37/24) containing a handle, a barrel, an intermediate link, a hammer, working and idling chambers, an annular chamber, a casing with holes, a gas distribution mechanism. The intermediate link is made of a shirt and a sleeve, pressed into each other, making up one whole. The gas distribution mechanism consists of a box, seat, cover, valve, pins and is made without welding. The barrel has two deep holes and a four-sided outer surface on which a metal sleeve is worn on the outside. Together with the faces, it forms four chambers for the release of exhaust air and damping noise.

During the operation of the known device (during long-term operation), the sleeve is loosened relative to the barrel and it begins to vibrate strongly, due to the fact that the end face of the sleeve from the handle side is not rigidly attached to the barrel.

A disadvantage of the known device is the high level of vibration and noise, which reduces operational characteristics, and, as a result, the low reliability of the device.

The objective of this utility model is to create a reliable pneumatic jackhammer with reduced vibration and noise characteristics.

The technical result is to increase reliability and reduce vibration and noise.

The problem is achieved in that in a pneumatic jackhammer containing a handle fixed movably relative to the barrel through an intermediate link, a valve, an annular chamber formed by an internal bore in the intermediate link and an air distribution mechanism, a muffler casing with holes connected to the handle and covering the barrel outside with a gap, a drummer dividing the central bore of the barrel into the working and idle chambers and a sleeve located on the barrel, the end face of the sleeve from the handle side is rigidly fixed mounted on the barrel, and the sleeve is provided with holes.

It is optimal that the holes in the sleeve are perpendicular to the axis of the barrel.

It is advisable that the holes in the liner are located under the muffler.

A tight fit of the end face of the sleeve on the barrel increases its rigidity, reduces the vibrations emanating from it, which leads to lower noise and increased reliability of the entire device.

Figure 1 shows a hammer in a section, figure 2 - air distribution mechanism and an intermediate link in a section, figure 3 - a trunk in a section.

The pneumatic jackhammer (Fig. 1) contains a handle 1, movably fixed relative to the barrel 2 through an intermediate link 3, a valve 4, an annular chamber 5 formed by an internal bore in the intermediate link 3 and an air distribution mechanism consisting of a valve box 6, a seat 7, a cover 8 and valve 9 (FIG. 2). In the barrel 2 (figure 1) is a drummer 10, dividing the Central channel to the chamber 11 of the stroke and the chamber 12 of the idle (reverse) stroke. The barrel 2 is made tetrahedral (figure 3) and is equipped with holes 13, 14 (figure 1). A sleeve 15 is worn on the barrel 2 from the outside, which together with the faces of the barrel 2 forms four chambers - receivers 16 (Fig. 3). The end face of the sleeve 15 from the side of the handle 1 is rigidly fixed to the barrel 2. The sleeve 15 is provided with holes 17 made perpendicular to the axis of the barrel. The barrel 2 outside with a gap covers the muffler casing 18 with holes. The intermediate link 3 (figure 2) consists of two parts: the shirt 19 and the sleeve 20, which in the manufacture of the intermediate link are pressed into each other. A working tool (not shown in FIG. 1) is installed in the barrel 2 from the side of the opposite handle 1.

Pneumatic jackhammer works as follows.

When you press the handle 1 (figure 1) in the axial direction, the handle 1 moves along the intermediate link 3.

The handle 1 presses on the valve 4, which opens the access of compressed air from the supply line to the annular chamber 5. Then, the compressed air passes through the air distribution mechanism, which directs it alternately to the chamber 11 of the stroke or to the chamber 12 of the idle (reverse) stroke, which determines the return - translational movement of the striker 10 in the barrel 2. The striker 10, moving, transfers energy to the working tool, which carries out the work. The exhaust air from the chambers 11 and 12 through the holes 13, 14 is transferred into four chambers - receivers 16, from where it goes through the holes 17 under the muffler casing 18 and through the system of holes in the muffler casing 18 is released into the atmosphere.

Thus, the proposed pneumatic breaker hammer has increased reliability and reduced vibration and noise characteristics.

Claims (3)

1. A pneumatic jackhammer comprising a handle fixed movably relative to the barrel through an intermediate link, a valve, an annular chamber formed by an internal bore in the intermediate link and an air distribution mechanism, a muffler casing with holes connected to the handle and enclosing the barrel from the outside with a gap, an impactor, dividing the Central channel of the barrel on the camera working and idling, and a sleeve located on the barrel, characterized in that the end face of the sleeve on the side of the handle is rigidly mounted on the barrel, and the sleeve is provided with holes. 2. The hammer according to claim 1, characterized in that the holes in the sleeve are made perpendicular to the axis of the barrel. 3. The hammer according to claim 1, characterized in that the holes in the sleeve are located under the muffler.