RU79826U1 - ELECTRIC HAND HAMMER OF SHOCK ACTION - Google Patents

Abstract

The utility model relates to vibration-protected electric hand hammers and can be used in various industries: mining, mechanical engineering, for the development of rocky and frozen soils, etc. An electric hammer hammer of shock action contains a handle (3), a housing (1), in which there is an electric motor, a gearbox, a crank mechanism, a barrel, a shock mechanism of a compression-vacuum type. A spring (4) of elastic steel is installed in the handle (3) in the form of two plates, which are installed in the recess in the base (5) of the shock-absorbing chamber (6) located between the handle (3) and the body (1). The technical result of the utility model is to reduce vibration, improve conditions, increase labor productivity. 1 ill.

Description

The proposed utility model relates to vibration-protected electric hand hammers and can be used in various industries: in mechanical engineering, in the mining industry, for the development of rocky and frozen soils; destruction of asphalt and concrete pavements, masonry.

Known manual electric hammers IE-4204, which consist of a housing, an electric motor, a gearbox, a crank mechanism, a barrel and a shock mechanism of the compression-vacuum type (see. Mechanized tools, finishing machines and vibrators. Directory-reference book. M., 1972, 370 pp. Under the scientific editorship of Nefedova ... p.68).

A disadvantage of the known design is the transfer of variable forces to the handle during rotation of the cylinder of the percussion mechanism during reciprocating motion, due to the lack of vibration damping on the handle. Known designs of electric hand hammers do not meet the hygiene standards for vibration.

Known pneumatic tool percussion, containing a housing, a handle, a working tool, a movable barrel with a drummer and an air distribution device for directing air through the channels to the drummer. Between the movable barrel and the handle, a cushioning chamber is formed, in which a spring, an elastic element is placed, which are installed with the possibility of interaction with the conical bell of the movable barrel, the adjusting cone and the nut cone. The nut is located between the barrel and the handle. The elastic element consists of two sectors - the upper conical shape and the lower cylindrical shape (see RU No. 34112, B25D 9/04, 11/27/2003).

However, the drawbacks of this hammer are the difficulty in manufacturing a shock-absorbing chamber having a large number of elements and parts made of different types of materials (rubber, steel of different grades), and the shock-absorbing chamber has large overall dimensions.

The closest solution in technical essence and the achieved result to the proposed utility model is a manual electric hammer, the main components of which are the body, electric motor, gearbox, crank mechanism, barrel and shock mechanism of the compression-vacuum type. An aluminum motor and a fan are installed in the aluminum case. The gearbox consists of the leading spurious and driven gears. The upper head of the connecting rod is mounted on a needle bearing on the finger of the crank shaft, and the lower head is connected with the finger to the movable cylinder of the percussion mechanism, inside which the firing pin is located. At the bottom of the barrel attached to the body is a shock absorber, nut and axle box. A working tool is inserted into the axle box (see. Mechanized tool; finishing machines and vibrators. Directory-reference book. M., 1972, 370 pp. Under the scientific editorship of Nefedova ... p. 70).

The main disadvantage of the known design is the transmission to the barrel and the handle of the reactive component of the shock pulse. On the barrel and handle, the vibration level does not comply with sanitary standards.

The technical task of the proposed utility model is the development of the design of an electric tool of percussion, which helps to prevent and reduce the likelihood of injury and vibration.

The technical result of the proposed utility model is to reduce vibration, improve working conditions, increase labor productivity.

The specified technical result is achieved in that the electric hammer hammer shock containing a handle, a housing, an electric motor, a gearbox, a crank mechanism, a barrel, a compression mechanism of the compression-vacuum type, according to a utility model, an additional spring is installed between the handle and the housing in the form of two plates made of elastic steel, placed in the recess of the base of the shock absorption chamber.

New in the proposed design of a manual electric hammer is the design of the handle, which is movable relative to the housing due to a spring made in the form of two plates, located in the recess of the base of the shock-absorbing chamber. The spring reduces the reactive component of the shock pulse, while the values of vibration velocity, vibration acceleration and amplitude correspond to the requirements of sanitary standards. The performance of an electric percussion instrument is improved, and the recoil force on hands is reduced. The effect of reducing vibration on the handle and tool body is achieved by reducing the amplitude of its forced vibrations.

In known electric hand hammers, a reduction in vibration activity is achieved by a rubber shock absorber, which is installed in the lower part of the barrel. The additional means of vibration damping that are used up wear out and the required vibration levels do not meet the standards, and the claimed utility model excludes the influence of vibration sources, such as variable internal forces, impact interactions of the working tool and the processed material with the body of the manual machine, while the level of contact vibration is reduced to the required sanitary normal.

The proposed design of the utility model is illustrated by the drawing, which schematically depicts an electric hammer hammer percussion.

The electric hand hammer contains a housing 1, in which there are an electric motor 2, a gearbox, a crank mechanism

connected to the movable cylinder of the compression mechanism of the compression-vacuum type, inside of which there is a firing pin (not shown in Fig.). The hammer also contains a barrel and a handle 3. To reduce higher frequencies than the main frequency of the tool, protect workers from high and low frequency components of vibration, reduce the reactive component of the shock pulse, a spring 4 of elastic steel is installed in the handle 3 in the form of two plates that are installed in the recess in the base 5 of the cushioning chamber 6. The handle 3 is fixed to the housing with pins 7. The cushioning chamber 6 is located between the handle 3 and the housing 1.

Electric hand hammer works as follows. When the rotor rotates, the cylinder of the percussion mechanism moves back and forth. When moving upward, a vacuum is formed in its cavity above the striker. Under the influence of the difference in atmospheric and residual pressure, the striker begins to move after the cylinder. Then the latter changes the direction of movement, the striker loses its speed, stops, and then rushes down and hits the instrument. At the moment of impact of the striker and the tool, a power impulse appears, which is displayed on the tool body 1, the spring 4, on which it is significantly reduced. Thus, the reactive component of the shock pulse on the handle is reduced by reducing the recoil force during shock interactions.

The hammer works when you press the case; when removing the pressure, it automatically goes to idle, as a result of opening the air cushion when lowering the striker on the axle box.

Claims (1)

An electric hammer hammer of shock action, comprising a handle, a housing in which an electric motor, a gearbox, a crank mechanism, a barrel, a compression-vacuum type shock mechanism are located, characterized in that a spring of elastic steel is installed in the handle, in the form of two plates, placed in the recess at the base of the shock absorber located between the handle and the body.