RU2497664C2 - Concrete surface finisher disc tool with variable gradient of magnetic field - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to construction and can be used for high-quality processing of uncured reinforced concrete surfaces of articles molded from concrete mixes for civil and industrial construction. Concrete surface finisher disc tool comprises drive shaft to transfer toque to smoothing disc. Electromagnets are fitted in smoothing disc recesses to induce magnetic field. Said electromagnets are fed via sliding contacts of rheostat to vary magnetic field gradient.

EFFECT: higher surface quality, high-strength surface layer.

2 dwg

Description

The invention relates to the field of construction industry and can be used for high-quality processing of uncured surfaces of reinforced concrete products molded from concrete mixtures for civil and industrial construction.

There are various smoothing machines for treating unhardened concrete surfaces of precast concrete products containing a portal, an electric motor, a smoothing disk of a concrete-finishing machine [Bolotny A.V. Smoothing concrete surfaces. - L .: Stroyizdat. Leningradok, department, 1979. - (Science-building. Production). 17 p., Ill. 6]. Also known is a manual smoothing machine [RU No. 2368497 C1, 09/27/2009, B21B 11/00] comprising a magnetic activator and a smoothing machine body.

The disadvantage of these machines is that there are no electromagnets with an electromagnetic field regulator. Processing known concrete-finishing machines is carried out by the interaction of the working body with the uncured machined surface of the product. When the working body of the concrete-finishing machine moves along a concrete uncured surface, kinetic processes occur that lead to a change in the physical and geometric characteristics of the surface that comes into contact with the working body, and the concrete is activated by a magnetic field emitted by electromagnets.

EFFECT: obtaining high quality surface treatment of concrete products, obtaining a high-strength surface layer.

The technical result is achieved in that the disk working body of the concrete-finishing machine containing a drive shaft, which has the ability to transmit torque to the smoothing disk, according to the invention contains a drive shaft, which has the ability to transmit torque to the smoothing disk, characterized in that in the recesses of the smoothing disk are located electromagnets that create a magnetic field, the power of which is supplied through sliding contacts through a rheostat, with which possible to adjust the magnetic field gradient.

in the recesses of the smoothing-down disc are electromagnets that create a magnetic field, the power of which is supplied through sliding contacts through a rheostat, with which it is possible to adjust the gradient of the magnetic field.

The invention is illustrated by drawings, where Fig. 1 shows a disc working body of a concrete-finishing machine with electromagnets, Fig. 2 shows magnets used on a smoothing machine.

The disk working body of the concrete-finishing machine with electromagnets consists of a damper 6 which has the ability to dampen the vertical vibrations of the housing 3, the drive shaft 1 driven by an electric motor. An elastic coupling 2 is located on the drive shaft 1, which in turn is fixed to the sleeve 3, the sliding contacts 8 are also attached to the sleeve 3, the power supply is connected to the sliding contacts through a rheostat 7, the smoothing disk 4 is rigidly fixed to the drive shaft 1 by bolting The smoothing-down disk 4 has recesses and inserts of a magnetic material with electromagnets 5 located in them.

The device operates as follows. When you turn on the motor through the coupling 2, the rotation is transmitted to the drive shaft 1, which is rigidly fixed to the smoothing disc 4 by means of a bolt connection. In the recesses are located, electromagnets that create a magnetic field, the gradient of which is regulated by a rheostat 7, activating the workpiece.

The advantage of this design is the high quality of processing concrete mixtures, obtaining a high-strength surface layer, the smallest roughness, and a change in the magnetic field gradient.

The result of applying the action of magnetic field forces on water in a mixture prepared with the use of binders is the development of the following processes: dispersion of molecular bonds and depolymerization of the liquid phase (dissociative process); the formation of a new, more streamlined in relation to the initial systemic - structural organization of the mixture; relaxation of the mixture prepared using binders to the initial stationary state (stabilization process). This leads to an improvement in the rheological characteristics of the mixture prepared with the use of binders, the rate of hardening of the material in the early stages is accelerated, the water-holding ability is increased, and the stratification of the product prepared using binders is reduced.

Therefore, it is advisable to use these working bodies and electromagnets with a variable gradient of the electromagnetic field.

Claims (1)

A disk working element of a concrete-finishing machine containing a drive shaft, which has the ability to transmit torque to a smoothing disk, characterized in that in the recesses of the smoothing disk there are electromagnets that create a magnetic field, the power of which is supplied through sliding contacts through a rheostat, with which it is possible adjust the gradient of the magnetic field.

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