SU1138323A1 - Pneumatic internal vibrator for compacting concrete mixes - Google Patents

Abstract

DEPTH PNEUMATIC VIBRATOR FOR SEALING CONCRETE MIXTURES, containing a hollow cylindrical body with inlet and outlet channels and an inner annular protrusion and a slider placed in its cavity, divided into upper and lower parts by an annular groove in which the annular protrusion of the body is in contact, using cylindrical parts of an annular groove in which there is an annular protrusion of the body in contact with a cylindrical part with a circular ring protrusion. end caps with slider guides, characterized in that, in order to increase the efficiency of the sealing processes, the supply channels are made in the housing above the annular protrusion, and the upper part of the slider - with evenly spaced around the circumference of the longitudinal grooves, and its diameter is equal to 0.33-0.7 of the diameter of the bottom.

Description

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This invention relates to the manufacture of precast concrete and reinforced concrete products.

TTS (BUT device for deep compaction of a concrete mix, containing a cylindrical body with inlet and outlet channels, in the cavity of which a slider is placed, and covers in contact with the cylindrical surfaces of its guide end lugs 1.

The disadvantage of this device lies in the complexity of the design, due to the large number of channels, recesses and grooves in the housing of the vibrator and lack of reliability, since there may be distortions of the slider in the housing.

The closest technical solution to the present invention is a deep pneumatic vibrator for compacting concrete mixtures, which contains a hollow cylindrical body with inlet and outlet channels and an internal annular protrusion and a runner placed in its cavity, divided into upper and lower parts by an annular groove in which the protrusion is located the housing in contact by means of the cylindrical protrusions of the end caps with the guides of the slider 2.

The disadvantages of the known device are the difficulty of achieving a high vibration intensity due to the small diameter of the inner cavity of the casing in relation to its outer diameter and, as a result, the efficiency of the compaction process of concrete mixes is insufficient.

The aim of the invention is to increase the efficiency of compaction processes.

This goal is achieved by the fact that in a deep pneumatic vibrator for compaction of concrete mixtures comprising a hollow cylindrical body with inlet and outlet channels and an inner annular protrusion and a runner placed in its cavity, divided into an upper and lower part by an annular groove in which an annular protrusion is placed housing in contact with the cylindrical protrusions of the end caps with directions. The runners of the runner, the supply channels are made in the housing above the annular protrusion, and the upper part of the runner has uniformly circumferentially longitudinal grooves, and its diameter. equal to 0.33-0.7 diameter of the lower part.

FIG. 1 schematically shows a deep pneumatic vibrator; in fig. 2 section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one.

A pneumatic vibrator for compaction of concrete mixes consists of a hollow cylindrical body 1, the internal cavity of which is divided by an internal

an annular protrusion 2 on the upper 3 and lower 4 parts, the air inlet pipes 5, the hoses 6, the air outlet pipes 6, the hoses 8 and the end caps 9 and 10.

In case 1 a slider I is placed, made with an annular groove 12 dividing it into the lower 13 and upper 14 parts, the diameters of which are different. The diameter of the lower part 13 is larger than the diameter of the upper part 14 and they are in a ratio of 0.330, 7. When the ratio of the diameters of the parts 13 and 14 of the slider is less than 0.33, the diameter of the upper part 14 of the slider becomes so small that the impact of air jets on it cannot provide the required oscillation frequency. When the ratio is greater than 0.7, the diameter of the upper part of the slider 14 causes a significant decrease in the eccentricity of the unbalance, as a result of which the vibration amplitude of the vibration exciter decreases. The lower part of the slider 11 is located in the lower part 4 of the cavity of the housing 1, and the upper part 14 of the slider I is placed with a gap in the upper part 3 of the cavity of the housing 1. The upper part 14 of the slider 11 is hollow and has longitudinal grooves 15 on the outer surface.

On the runner 11, the end guides 16 are made, and the end caps 9 and 10 of the housing 1 are provided with protrusions 17 in contact with the guides 16. In the upper part 3 of the cavity 1 there are supply channels 18, and discharge channels 19 - in the upper part end cap 9, communicating respectively with air supply 5 and air vent 7 nozzles. The inlet holes 20 are located in the walls of the upper part 3 of the cavity of the housing 1 diametrically opposite.

A deep pneumatic vibrator for compacting concrete mixes works as follows.

Before starting work, a deep pneumatic vibrator is installed in a molding cavity filled with concrete, or in an array of concrete. Then, compressed air is supplied to the air inlet pipe 5. Compressed air through the channels 18 through the holes 20 enters the upper part 3 of the cavity of the housing 1.

Before starting work, the slider 11 with the end part of the annular groove 12 rests on the annular protrusion 2 of the housing 1. Under the influence of compressed air jets, the upper part 14 of the slider located with a gap in the upper part 3 of the cavity of the housing 1 begins to move, engaging the lower part 13 of the slider 11 . Since parts 13 and 14 of slider 11 have different diameters, during operation of the vibrator, a functional differential slider is achieved for the drive top 14,

and the inertial lower 13 part. At the same time, the slider 11 slides the end surface of the groove 12 along the protrusion 2 of the housing 1, its guides 16 surround the end protrusions 17 of the covers 9 and 10. Such movement of the runner 11 lasts until it reaches a sufficient number of revolutions (500 rpm) in which a sufficiently large centrifugal force occurs, pressing the lower part 13 of the slider 11 to the inner surface of the lower part 4 of the cavity of the housing 1, while part 14 of the slider 11 moves with a gap relative to the internal surface of the upper part 3 of the cavity of the housing 1.

The presence of the grooves 15 on the surface of the upper part 14 of the slider 11 allows more complete use of the kinetic energy of compressed air jets due to an increase in the angle of attack.

To reduce bending deformations from centrifugal loads, the weight of the slider 11 is reduced, for which the upper

part 14 of slider 11 is hollow and smaller in diameter. The exhaust air through the air exhaust ducts 19 enters through the nozzle 7 and the hose 8 into the atmosphere. Differentiation of the runner 11 to the inertial lower 13 and the driven upper 14 parts allows to achieve the most unbalanced moment of the device’s outer diameter, because the inertial lower part 13 in this case a much larger diameter than the drive top part -14. An increase in the unbalance moment leads to an increase in the oscillation amplitude of the vibrating device and provides an increase in the efficiency of compaction of the concrete mix.

The use of the proposed in-depth pneumatic vibrator in construction will improve the efficiency of the concrete mixture compaction process and, thus, the quality of civil and industrial facilities being built.

Claims (1)

DEPTH PNEUMO VIBRATOR FOR SEALING CONCRETE MIXTURES, containing a hollow cylindrical body with inlet and outlet channels and an inner ring protrusion and a slider located in its cavity, divided into upper and lower parts by an annular groove in which an annular protrusion of the housing contacting with the cylindrical protrusions is placed covers with runner guides, characterized in that, in order to increase the efficiency of the sealing processes, the supply channels are made in the housing above the annular protrusion, and the top Thread portion of the slider - with uniformly circumferentially spaced longitudinal slots, and its diameter is equal to the diameter of the bottom portions 0,33-0,7 ^. with OO WITH ND CO