RU190688U1 - Electric Hand Hammer - Google Patents

Abstract

The invention relates to vibration-proof electric hand hammers and can be used in various industries: mining, mechanical engineering, for the development of stony and frozen soils, etc.Electric percussion hammer containing a handle, a housing that houses an electric motor, gearbox, crank mechanism, barrel, impact mechanism of compression-vacuum type with a striker, in the handle there is a spring made of elastic steel, in the form of two plates, placed in a recess in the bases It is located in the depreciation chamber located between the handle and the body, and the hammerhead is made with enamel coating VL-515, whose thickness is 55-85 microns. The technical result is an increase in the reliability of the striker and an increase in labor productivity.

Description

The utility model relates to vibration-proof electric hammers and can be used in various industries: mining and mining, mechanical engineering, for the development of rocky and frozen soils, etc.

Known compression-vacuum shock machine (Patent RU №2170658 C2 IPC B25D 11/12, E21B 1/12, E21B 1/32. Publication date: 20.07.2001 Bulletin No. 20), comprising a housing, an actuator that includes an engine, a reducer and a converting mechanism, a shock mechanism consisting of a guide cylinder, a glass-like piston housed in it, connected to the converting mechanism by means of a hinge, and a drummer is placed inside the piston, causing periodic blows to the working tool and connected to the piston by an air cushion, and in a guide cylinder is There is no internal groove, bounded by the upper and lower edges and in the wall of which there is a radial bore and a flat face is made on the outer surface of the piston; , formed by the bald and inner surface of the guide cylinder, through the groove and the radial hole with the atmosphere, and the flat on the length of the piston is closed, having upper and lower edges, and a distance L from the bottom edge of the flat to the upper edge of the internal groove of the guide cylinder, when the piston is in the bottom dead center, is within R <L <2R, where R is half the full stroke of the piston, from the bottom dead center position, to the upper dead point position .

The disadvantages of this compression-vacuum shock machine are the low reliability of the drummer and labor productivity.

The closest electric hand hammer device is known (Patent RU No. 79826 U1 MPK B25D 11/00. Publication date: 01/20/2009 Byul. No. 2), containing a handle, a housing containing an electric motor, a gearbox, a crank mechanism, a barrel, a shock-type compression-vacuum type mechanism, inside of which the head is located, a spring made of elastic steel is installed in the handle in the form of two plates placed in a recess at the base of the shock-absorbing chamber located between the handle and the body.

The disadvantages of this electric hammer are low striker reliability and labor productivity.

The technical result of the utility model is to improve the reliability of the striker and increase productivity.

The task is solved by the fact that in the proposed device, an electric hand hammer of percussion, comprising a handle, a housing in which an electric motor, a gearbox, a crank mechanism, a barrel, a shock mechanism of a compression-vacuum type inside which the hammer is located, is installed in the handle spring made of elastic steel, in the form of two plates, placed in a recess at the base of the shock-absorbing chamber located between the handle and the body, and the striker is made with a coating on the basis of enamel VL-515 thickness oh 55-85 microns.

The proposed solution allows to increase the reliability of the striker and increase productivity by changing the turnaround time.

The loading of the striker is of shock wave nature and is accompanied by vibration and noise. In the region of interaction of the discharge waves, large short-term tensile stresses arise, leading to the destruction of the material. Such a specific type of dynamic destruction caused by the interaction of the rarefaction waves is called spallation [3].

The sharp edges of the striking nozzle of the impactor destroy the inner surface of the barrel, reduce the compression, as a result of which the barrel becomes non-repairable [4].

Enamel VL-515 is a solution of polyvinyl butyral cresol-formaldehyde resins in a mixture of organic solvents with the addition of redoxide and talc [5].

Polyvinyl butyral resin is insoluble and does not swell in hydrocarbons. As a film-forming material, polyvinyl butyral has a complex of very valuable properties: mechanical strength, high adhesion, flexural strength, good strength with direct and backward impacts, etc. type, since the phenolic resin gives thermal composition to the resin composition. In the process of drying the film, not only the reactions between the methylol groups contained in the phenolic resin, but also the reactions between the methylol and hydroxynol groups contained in the polyvinyl butyral proceed.

As a result of these reactions, the formation of structures of the network structure occurs, which increases the mechanical strength of the coatings, their water and vapor resistance, as well as resistance to petroleum products and aromatic hydrocarbons (benzene, toluene). Enamel is applied to the surface of technical equipment by pneumatic spraying, brushing or dipping. To dilute the enamel to the required viscosity, use solvent R-60 (TU 6-10-1256-72), consisting of technical ethyl alcohol (70%) and ethyl cellosolve (30%)

Approximate enamel consumption: 100-120 g / m ² .

Single-layer coating thickness: 25 - 40 microns

Number of layers: 2-3

To ensure the necessary continuity and high anti-corrosion properties, the coating thickness on the basis of enamel VL-515 should be 55-85 microns. The coating does not need a special primer, as it has a high adhesion to metal [5].

Enamel is a thin protective coating, usually two-layer, where the first layer provides the interaction of metal molecules with the coating molecules, and the second layer creates the desired properties. When applying a coating thickness greater than the recommended value, due to local thickening of the enamel coating, there will be detachments [6]. Insufficient thickness of the coating can not provide resistance to corrosion under the action of the environment and resistance to mechanical damage [7].

The coating on the basis of enamel VL-515 get cold (15-20 ° C) and hot (120 ° C) drying. With cold drying, each applied layer of enamel hardens at 15-20 ° C for 24 hours or at 120 ° C for 1 hour. The coating has high physicomechanical and good painting and technological properties.

Enamel-based coating renewal is carried out during major repairs.

The increase in labor productivity is achieved by reducing wear on the striker and by changing the turnaround time, by covering it with high adhesion and good strength in direct impacts.

Information sources

1. Patent RU No. 79826 U1 IPC B25D 11/00 Electric hand hammer of impact action Publication date: 20.01.2009 Bull. No. 2

2. Patent RU No. 2170658 C2 IPC B25D 11/12, E21B 1/12, E21B 1/32 Compressive-vacuum percussion machine. Date of publication: 20.07.2001. Bul No. 20

1. Novikov S.A. The destruction of materials under the influence of intense shock loads // Soros Educational Journal. - 1999. - № 8. - p. 116-121.

2. Drummers to jackhammers and concrete breakers - causes of breakage [Electronic resource]. URL: https://tradeacons.com/stati/udarniki-k-otboynym-molotkam-i-betonolomam-prichiny-polomki/.

5. https://www.chem21.info/page/019103081099009003096094157198209029163194127163/

6. https://www.ngpedia.ru/pg051fMo74R2e2f5e5x3n70025517541/

7. mashxxl.info/page/1961390980382311540061201310531100550802546096130.

Claims (1)

Electric hand hammer percussion, containing the handle and the body, which is an electric motor, gearbox, crank mechanism, barrel, impact mechanism of compression-vacuum type with striker, moreover, in the handle there is a spring made of elastic steel in the form of two plates, placed in the recess at the base of the depreciation chamber located between the handle and the case, characterized in that the striker is provided with a protective coating of enamel VL-515 with a thickness of 55-85 microns.