RU2368721C1 - Vibration tape working element - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention is related to the field of construction industry and may be used for high quality processing of nonsolidified concrete surfaces from rigid concrete mixtures used for civil and industrial construction, and also in installation of road asphalt concrete carpets. Vibration tape working element in the form of eccentric drive mechanism comprises body with vibration working element, which is installed directly on internal surface of tape and is able to transfer vibration effect to tape by means of four vibration plates, which are separated into two groups that vibrate in antiphase by means of eccentric shaft rotation, which may change frequency and amplitude of oscillations in process of operation.

EFFECT: reduced wear of tape, lower vibration transferred to portal of smoothening machine, higher quality of concrete mix smoothening.

7 dwg

Description

The invention relates to the field of the construction industry and can be used for high-quality processing of uncured concrete surfaces from hard concrete mixtures used for civil and industrial construction, as well as for laying road asphalt pavements.

Various tape smoothing devices are known for processing unhardened concrete surfaces of precast concrete products and road asphalt concrete pavements. Processing of building and road materials by known tape working bodies of concrete-laying machines is carried out mainly at the leveling stage or as a preliminary operation.

Closest to the proposed is a smoothing device in the form of a drive vibratory tape and a massive beam, making a reciprocating motion along the longitudinal axis [Bolotny A.V. Smoothing concrete surfaces. - L .: Stroyizdat, Leningrad Branch, 1979. - (Science - builds. Production). 128 s., Ill.].

A disadvantage of the known device is the high speed of the tape, rapid wear of the tape, vibrations of the beam transmit vibration to the portal of the smoothing machine, as a result of which the surface quality of the workpiece is deteriorating.

The technical problem solved by the invention is to reduce the wear of the tape, reduce the vibration transmitted to the portal smoothing machine, improving the quality of smoothing concrete mixtures.

The technical result is achieved by the fact that the vibration surface is transmitted to the inner surface of the tape by means of four vibrating plates, which are divided into two groups, vibrating in antiphase, by rotation of the eccentric shaft.

The invention is illustrated by drawings: figure 1 shows a General view of a vibrating tape working body; figure 2 shows a bottom view of the vibrating plates of the tape working body (tape conditionally not shown); figure 3 shows the internal structure of the vibrating tape working body; figure 4 shows a longitudinal section of a cam shaft with variable eccentricity; figure 5 shows a cross section of the cam.

The tape working body is (figure 1, 2, 3) tape 7, which is stretched on three rolls. The rolls are mounted on bearings 15. Roll 1 is the lead, roll 2 is tension, roll 3 is guide. On the inner side between the rollers 2 and 3, a housing 4 with vibrating plates 11 and their drive 5 is installed, which consists of an eccentric shaft 12 mounted on thrust bearings 14.

The eccentric shaft (Figs. 4, 5) consists of a main shaft 12, on which there are four cylindrical belts 28, and the axis of these belts does not coincide with the axis of rotation of the shaft. Eccentric bushings 23 are installed on the cylindrical belts, which can rotate relative to the cylindrical belts, being held on the plates 24, 25 and covers 19. In this case, two working chambers are formed inside each sleeve 23, in which, through the channels 22 in the shaft 12, it can fluid is supplied.

The device operates as follows: the drive motor 5 tells the eccentric shaft rotation through a chain gear 18. The eccentric shaft transmits reciprocating movements to the pushers 13, which are rigidly connected to the vibrating plates, the springs 16 provide constant contact of the pushers with the eccentric shaft. Vibrating plates transmit in pairs (segments 9 and 10) vibrations to the tape, which, in turn, reports the vibrational effect of the compacted concrete mixture. In the process of operation of the device, it is possible to change the amplitude of vibration of the plates. The change in the oscillation frequency is realized by changing the rotation frequency of the drive motor 5 (hydraulic motor) of the eccentric shaft, the amplitude of the oscillations a can be changed by changing the eccentricity on the shaft 12.

Under the action of pressure P of the working fluid supplied through the manifold 6, force is transmitted to the plate 24, due to which the eccentric sleeve rotates on a cylindrical belt, thereby changing the eccentricity of the shaft 12. Stoppers 26 and 27 are installed on both sides of the plate so that the plate not blocked the channels 20. A change in the eccentricity entails a change in the amplitude of the oscillation of the pushers. In this case, the eccentricity e can smoothly vary within the established limits (in FIGS. 5, 6, 7, the eccentricity varies from 0 to 5 mm), when the working fluid is supplied through hydraulic lines 17 through a throttling valve 21.

Claims (1)

A vibrating tape working body in the form of an eccentric drive mechanism, characterized in that the housing with the vibrating working body is mounted directly on the inner surface of the tape and is able to transmit the vibration effect of the tape through four vibrating plates, which are divided into two groups, vibrating in antiphase by rotation of the eccentric shaft, which has the ability to change the frequency and amplitude of oscillations in the process.

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