RU34112U1 - Pneumatic impact tool - Google Patents

Description

-g-o-t-z g. g i g MPK V25D9 / 04

Pneumatic tool

The utility model relates to vibration-protected hammers and can be used in various fields of industry, in particular, in the mining industry, in mechanical engineering and construction, when cutting metals and breaking old structures, it is possible to produce metal stamping and riveting.

Known pneumatic percussion machines with spool and valve air distribution, which consist of a body - a handle with a working tool, a movable barrel, a drummer and an air distribution device located in the barrel (see the manual on mechanized hand tools. Sudakovich DI, Vernadsky G.I. ., M., Mashgiz, 1961, p. 224).

The main disadvantage of this design is the transfer of variable air pressure forces to the handle, due to the absence of vibration dampers on the handle and the barrel, the known devices do not meet the sanitary requirements for vibration.

The closest solution to the utility model is a pneumatic percussion instrument, comprising a housing - a handle with a working tool, a movable barrel, a hammer placed in the barrel and an air distribution device. The drummer divides the barrel into the front and rear camera. Compressed air enters the air distribution device from the network. The trunk forms the back and front cavities with the body - the handle (see USSR author's certificate No. 759306, IPC V25D9 / 04, 1980, B.I. 32).

A particular drawback of this design is its complexity and increased vibration on the housing.

E12SZ / 24

to prevent injuries and vibration dysfunction.

The technical result of the utility model is to reduce vibration therapy, increase labor productivity.

The specified technical result of the proposed utility model is achieved by the fact that a pneumatic impact tool comprising a housing, a handle, a working tool, a movable barrel with a hammer located therein and an air distribution device for directing air through the channels to the hammer, according to the claimed utility model between the movable barrel and the handle A shock-absorbing chamber is formed, in which a spring, an elastic element is placed, which are installed with the possibility of interaction with a conical socket movable stem, the adjusting cone and the cone nut disposed between the movable barrel and the grip, wherein the elastic member is composed of two sectors - an upper made conical and bottom, formed in a cylindrical shape, which are made of rubber of different brands.

A distinctive feature of the new tool in comparison with the known tool is a system of an elastic spring-air link and an elastic element that smooth and reduce the reactive component of the shock pulse. The values of vibration displacement and vibration velocity practically correspond to sanitary standards. The performance of the pneumatic tool is improved, the return on hands is reduced, and the force of pressing the handle of the hammer is reduced. The effect of reducing vibration for pneumatic tools is achieved by reducing the amplitude of its forced vibrations and the frequency of natural vibrations of the handle.

The drawing schematically shows a pneumatic impact tool.

The pneumatic tool for shock action comprises a movable barrel 1, a handle 2 mounted for movement along the movable barrel 1. Between the movable barrel 1 and the handle 2, a shock-absorbing chamber 3 is constantly filled with compressed air.

The mating surfaces of the handle 2 and the movable barrel 1 are provided with conical sockets 4 and 5, respectively. To protect the worker from high-frequency vibration components, as well as smoothing the reactive component of the force pulse on the handle 2, the device comprises a spring 6 installed in the shock-absorbing chamber 3, an elastic element 7. The spring 6 is installed with the possibility of interaction with a conical socket 5 and an adjusting cone 8, which installed with the possibility of interaction with the elastic element 7 and the possibility of regulation by screwing a standard nut into the cone of the nut 9, located between the barrel 1 and the handle 2.

The elastic element 7 consists of two sectors made of rubber of different grades - the upper, made of a conical shape, and the lower, made of a cylindrical shape, pressed against each other by an adjusting cone 8 and a nut cone 9.

In addition, the pneumatic impact tool contains a hammer, located in the movable barrel 1 (not shown in the drawing), an air distribution device, a trigger mechanism is located in the handle 2 (not shown in the drawing). The handle 2 has channels 10 for supplying compressed air.

Pneumatic impact tool works as follows.

When you pull the trigger trigger, compressed air through the channels 10 of the handle 2 fills the shock absorption chamber 3 and then enters the hammer hammer, providing acceleration of the hammer. At the moment of impact of the striker and the tool shank, a power impulse arises, which is output to the tool body and drives a system of elastic spring-air link 6.7 in the cushioning chamber 3. This system in this case significantly smoothes and reduces the reactive component of the shock pulse. At the same time, the barrel 1 moves relative to the handle 2 of the hammer and the mating surfaces of the conical bells 4,5 are disconnected, part of the compressed air is discharged into the resulting gap.

With further movement of the striker, an impulse arises, determined by the mechanical impedance of the “working tool - processing object” system. As a result, the barrel 1 moves in the reverse direction and the reverse blow is softened by the air cushion formed in the gap.

Self-sealing of the cushioning chamber 3 is provided due to the continuous fit of the surface of the conical bells 4,5. The pressure in the shock absorption chamber 3 depends not only on the air pressure in the line, but also on the stiffness of the spring 6.

The compression force necessary to maintain the operating mode of the hammer is significantly reduced compared to a hammer without vibration protection.

The proposed tool can significantly reduce the level of vibration and the required pressing force, which leads to increased labor productivity, the prevention of injury and vibration disease.

Claims (1)

An impact pneumatic tool comprising a housing, a handle, a working tool, a movable barrel with a hammer placed therein and an air distribution device for directing air through the channels to the hammer, characterized in that a spring chamber is formed between the movable barrel and the handle, in which the spring is elastic an element that is installed with the possibility of interaction with the conical socket of the movable barrel, the adjusting cone and the cone of the nut located between the movable barrel a handle, wherein the elastic member is composed of two sectors - an upper made conical and bottom, formed in a cylindrical shape, which are made of rubber of different brands.