RU1770118C - Impact-action pneumatic machine - Google Patents

Abstract

Usage: mechanical engineering, construction, metallurgy, for example, for chipping cast iron. SUMMARY OF THE INVENTION: A pneumatic impact machine comprises a cylindrical body and associated rubber handle. The latter has a Q-shape and is fixed by the ends to the body. The hardness of the rubber at the ends of the handle is greater than the hardness of the rubber in the rest. 3 s; n. f-ly, 3 ill.

Description

The invention relates to pneumatic impact machines and can be used in the manufacture of chipping hammers for chipping cast iron.

A known pneumatic impact machine according to auth. No. 977151, comprising a handle movable relative to the body. A damping device is placed between the handle and the housing. Compressed air is supplied to the machine by pressing the handle. This principle of turning the machine into operation is negatively perceived by the cast iron cutters, and the trigger is preferred when it is necessary to turn on the machine and without axial force on it.

Known vibration protection handles for autosw. N 977152, made of hollow rubber shells filled with air.

Their disadvantage is structural complexity, low wear resistance due to friction of the surfaces of the shells, the need for air pressure in the optimal range, because supplying the same pressure to the air shells as in the maistral will make them practically rigid. Device for maintaining optimum pressure No. 933445 is missing.

Taking into account that the area of the chamber on which the worker’s hand rests is 20-30 cm, and the pressure should be in the range of 15-20 kg, the pressure in the chamber should be 0.75-0.65.

A known pneumatic impact machine according to auth. No. 1397275, comprising a barrel, a hammer placed therein, a hollow handle with a cylindrical body, a glass, the last of which is coaxial to the barrel and embraced by it, and a shock absorber for interacting with the handle and glass, which can be adopted as a prototype.

The disadvantage of this percussion machine is that due to the presence of compressed air in the cavity of the cylindrical body of the handle, the operation of the shock absorber is practically blocked, since on the

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The casing wall is operated at full recoil pressure, synchronous with the vibrations of the machine, and these vibrations are transmitted to the handle. Such a pneumatic machine is the PM-165 manual pneumatic chipping hammer of the VNIISMI design, which did not give a positive result during testing.

The aim of the invention is to reduce vibration.

The positive effect is the simplicity of reducing the level of vibration, because the damping element is the handle itself without additional devices.

This goal is achieved by the fact that in a pneumatic impact machine comprising a barrel, a hammer placed therein, a switchgear, a cylindrical body connected to the barrel and a rubber handle connected to the latter, in order to reduce vibration of the handle, it is made in a Q-shape and fixed by the ends on the cylindrical body, and the hardness of the rubber at the ends of the handle is greater than the hardness of the rubber and the rest.

Figure 1 shows a longitudinal section of a pneumatic machine; figure 2,3 shows the installation options of the elastic element (section along BB-1).

The pneumatic impact machine consists of a barrel 1. a hammer 2 located therein, a rubber handle 3 with a cylindrical body 4, an air supply device and an air distribution device 5. The air supply device includes a sleeve 6 located in the cylindrical body 4, with an inner collar 7 and windows 8, A ball valve 9 is placed in the sleeve, spring-loaded 10 to the collar 7. From the ends into the sleeve b, a fitting 11 is screwed for connection to the air line and plug 12 with a pusher 1 passing through its axial hole 3, with which the trigger 14 pivotally mounted on the plug 12 is in contact, with the fitting 11 and the plug 12, the handle 3 is attached to the cylindrical body 4 screwed onto the barrel 1. In the handle 3 there is an elastic

element 15, made in the form of a metal strip or frame of elastic wire.

The ends of the handle 3, connected to the housing 4, to the section BB are made of more rigid rubber than the arcuate part of the handle and are inclined to the housing.

Job. Compressed air is supplied through the fitting 11. When the trigger 14 is pressed, the pusher 13 pushes the valve 9, the machine turns on. With longitudinal vibrations of the machine, the bends of the handle 3 occur in the planes of sections AA and BB. As a result of this, as well as the elasticity of the handle, the vibrations of the machine are damped and are not transmitted to the hand of the worker. The worker freely manipulates the deviations of the machine from left to right, because the handle has lateral stiffness.

Claims (4)

1. A pneumatic impact machine comprising a barrel, a hammer placed therein, a switchgear connected to the barrel with a cylindrical body and a rubber handle connected last, characterized in that, in order to reduce vibrations, the handle is I-shaped shape and fixed by ends on a cylindrical case, and the hardness of the rubber at the ends of the handle is greater than the hardness of the rubber in the rest. 2.Nor machine. 1.0t and more that. it is equipped with an elastic element, located inside the handle. 3. The machine according to claim 2, characterized in that the elastic element is made in the form of at least one metal strip. 4. Machine pops 1-3, characterized in that, with a simplification circuit, two radial coaxial holes are made in the cshndricher case, at each end of the handle is made the hole, and the switchgear is made in the form of a cylinder with flanges at the ends for placement in the holes of the cylindrical body and handle.