RU2511324C2 - Rod-type concrete mixer - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed concrete mixer comprises rotary drive, drum and working member composed by isolated rolling rods. Said working member is composed of multistart helical surface with helical grooves inside and outside said rolling rods at acute angle to their rotational axes in the form of curved pockets with centres of curvature of pocket curved helical surface. Said pockets are arranged alternatively outside and inside roll rod cross-section. Said pockets are composed of at least one coiled strip with turns connected along lengthwise edges. Said strip is bent in wavy manner at acute angle to its lengthwise edges along creases to make helical surface with helical grooves inside and outside said rolling rods at acute angle to their rotational axes in the form of curved pockets directed to their rotational axes at acute angle over inner and outer surfaces. Said pockets can vary in both shape and size along perimeter of rods-rolls. Distance between flexure lines equals the sum of perimeters of pockets of inner and outer surfaces. Note here that hollow helical surfaces of roll-rods are filled with metal or concrete.

EFFECT: expanded performances.

7 dwg

Description

The invention relates to devices for the preparation of mortars and concrete mixtures.

Known concrete mixer patent according to RU 2060240 C1 05/20/1996, in which a rod mixer is used to mix the concrete mixture.

A disadvantage of the known device is the limited technological capabilities, a large number of components and the complexity of manufacturing, which leads to a decrease in the reliability of the concrete mixer.

Closest to the proposed one is a rod concrete mixer (patent according to RU No. 2428306, class B28C 5/22, publ. 05/10/2011, Bull. No. 25), containing a drum having a rotation drive and a working body, made in the form of unrelated Roller rods.

A disadvantage of the known device is the limited technological capabilities and complexity of manufacture.

The technical solution to the problem is to expand technological capabilities and simplify manufacturing.

The technical solution is achieved by the fact that in a rod concrete mixer containing a drum having a rotation drive and a working body made in the form of roller rods not tied together, the working body is made in the form of a multi-helical surface with helical grooves inside and outside the roller rods at an acute angle to the axis of their rotation in the form of pockets of a curved shape with centers of curvature of the pockets of a curved shape of a helical surface, alternately located outside and inside the cross-section of the rollers, mounted from one rolled into cylindrical coils connected to each other along the longitudinal edges, tapes of the same width, bent in waves along the bend lines placed at an acute angle to its longitudinal edges, with the formation along the outer and inner surfaces directed to one side at an acute angle to the axis the rotation of the rolling rods of screw surfaces in the form of pockets of curved shape on the outer and inner surfaces, which around the perimeter of the rolling rods can be different not only in shape but also in size m, while the distance between the fold lines is equal to the sum of the lengths of the perimeters of the geometric figures of the pockets of the inner and outer surfaces, and the hollow helical surfaces of the roller rods are filled inside with metal or concrete.

According to the patent literature not found a technical solution similar to the claimed, which allows to judge about the inventive step of the proposed design of the core concrete mixer.

The novelty of the invention lies in the fact that due to the implementation of the working body in the form of unrelated roller rods, made in the form of a multi-helical surface with helical grooves inside and outside the roller rods at an acute angle to the axis of rotation in the form of curved pockets with the centers of curvature of the pockets of a curved shape of the helical surface, alternately located outside and inside the cross section of the rollers, the total contact area of the working bodies with the mixed particles and mixing water. Therefore, the intensity and activity of mixing particles of the components of the mortar and concrete mixtures, as well as mixing water, increases and expands the technological capabilities of the core concrete mixer.

The novelty also lies in the fact that the manufacture of roller rods with the formation on their outer and inner surfaces directed to one side at an acute angle to the axis of rotation of the roller rods is a helical surface in the form of pockets of a curved shape, which around the perimeter can be different not only in shape , but also in size, while the distance between the fold lines is equal to the sum of the lengths of the perimeters of the geometric figures of the pockets of the inner and outer surfaces, not only can significantly increase the length of the contact of the working body s with the inner cylindrical surface of the drum, depending on the magnitude of the pitch of the helical lines and the number of runs, but also to inform the particles of the components of the mortars and concrete mixtures, as well as the mixing water, additional movements along the helical lines, i.e. longitudinal movement of mortars and concrete along the axis of the drum, and to provide accelerated movement of the components of mortars and concrete to the discharge hole.

The novelty is also due to the fact that due to the implementation of the working bodies in the form of non-connected roller rods and an increase in the power and frequency of contacts of their multiple helical surfaces with each other and with the cylindrical surface of the drum and with particles of inert and knitting materials, they are not only crushed , but also the intensity of mixing, which expands the technological capabilities of the core concrete mixer.

The novelty is seen in the fact that each rod-roller is made of one tape, which simplifies the manufacture and extends technological capabilities.

The novelty of the proposal also lies in the fact that outside the helical rod-roller with a complex external surface in the form of a combination of two curved surfaces at each point there are multidirectional components of the movement, which intensifies not only mixing processes, but also mixing, expands technological capabilities.

The novelty also lies in the fact that with the same diameter of the roller-rod of known designs and the proposed design in the proposed design, the scan length of the diameter of the roller-roller along the perimeter due to its waviness along the perimeter is much larger, therefore, the path of the particles of the components of concrete mixtures and mixing water, in comparison with the known designs of the roller rods, is much larger, which makes it possible to reduce the dimensions of the concrete mixer drum both in length and in diameter.

The invention is illustrated by drawings, where: in Fig.1 shows a General view of a rod concrete mixer; figure 2 is a section aa in figure 1; figure 3 - one of the rods, rollers, General view, front view; figure 4 is a section bB in figure 3; figure 5 - tape with marked lines of bending in the form of straight lines for the rod-roller; 6 is a tape bent along the straight lines of the fold of a wavy shape; Fig.7 is a perspective view of a wave-shaped tape rolled into a cylindrical coil.

Rod concrete mixer (figure 1, figure 2) consists of a frame 1, made in the form of a welded frame. A drum rotation drive 2 is mounted on the bed, consisting of an electric motor 3, a gearbox 4 and four roller bearings 5. The drum 2 is equipped with two rims 6, which are supported by roller bearings with flanges 5. A means for loading 7 components of mortars or concrete mixtures is mounted on the bed 1 and a means for unloading 8 finished mortars or concrete mixtures. The concrete mixer is equipped with a pipe 9 for supplying mixing water into the drum 2. Inside the drum 2, the working bodies in the form of rod-rollers 10 with guide elements in the form of multi-helical screw surfaces are freely laid in full length. The number of rods-rollers 10 is set depending on the speed of rotation of the drum 2, its diameter, the diameter of the rods-rollers 10 and the degree of loading by the rods-rollers 10. The rods-rollers 10 are not connected to each other and freely roll inside the drum 2. Execution of the working body in the form of unrelated roller rods allows you to increase the contact length where materials are mixed and simplify the design in view of the refusal of the forced drive of the working bodies - roller rods. To prevent the longitudinal movement of the roller rods 10 inside the drum 2 mounted known devices (not shown). The roller rods 10 are filled inside with metal or concrete 11.

The manufacture of roller rods 10 with multi-helical surfaces located along the perimeter of the roller rods along helical lines allows not only to significantly increase the length of the contact of the working bodies with the cylindrical surface of the drum 2, depending on the magnitude of the pitch of the helical lines and the number of runs, but also to inform bulk materials additional movement along helical lines, i.e. longitudinal movement along the axis of the drum 2, and provide movement to the unloading device.

The roller rods 10 (Fig. 3, Fig. 4) are made around the perimeter in the form of a multi-helical surface with helical grooves inside and outside the roller shaft in the form of pockets of a curved shape at an acute angle to the axis of rotation with centers of curvature of the pockets of a curved shape of the screw surface, alternately located outside and inside the cross section of the roller bar. The roller core 10 (Fig. 3, Fig. 4) is made of at least one tape 12 connected along the longitudinal edges 13 (shown in Fig. 3 by a dash-dot line with two points) by known methods, for example, welding, with the formation of the outer and the inner surfaces of the screw surfaces directed to one side at an acute angle in the form of pockets of curved shape on the inner surface of 14, 15, 16, 17, 18, 19 and pockets of curved shape on the outer surface of 20, 21, 22, 23, 24, 25, which along the perimeter of the roller-rod can be different not only in terms of yoke, but also the size. The tape 12 (FIG. 5, FIG. 6) is bent in a wave-like fashion along straight lines 26 located at equal angles α to the longitudinal edges 13 of the tape 12 and placed at a distance L between the fold lines 26. The distance L is the sum of the lengths of the perimeters of the geometric shapes of the pockets of the inner and outer surfaces. The tape 12 after a wave-shaped bend (Fig. 6) is rolled into cylindrical coils (Fig. 7), connected to each other along the longitudinal edges 13 by known methods, into a rod-roller 10, the inner cavity of which is then filled with metal or concrete by known methods.

Rod concrete mixer works as follows. The components (cement and inert materials) of the concrete mixture and mixing water through the pipe 9 are continuously loaded into the drum 2 through the loading means 7. During the rotation of the drum 2, particles of cement and inert materials are captured by the inner surface of the drum 2 and rise upwards. Upon reaching a certain height under the influence of gravitational forces and the angle of repose formed, particles of cement and inert materials move down. Simultaneously with the components of the concrete mixture due to the centrifugal force and the friction forces, the roller rods 10 are shifted to a certain angle in the direction of rotation and also rise up. When reaching a certain height under the action of gravity, they roll down the walls of the drum in the direction opposite to the rotation of the drum 2. The speed of rotation of the drum 2 is calculated so as to ensure only the rolling of the roller rods, and should not exceed the value when the separation of the roller rods can occur 10 from the walls of the drum 2. When rolling, each rod receives a rotation opposite to the rotation of the drum 2. When the rods 10 rotate, the particles of the concrete mixture components move along their helical lines, moving tsya along the horizontal axis and unloaded from the drum 2 in the means 8 for unloading. In this case, not only the mixing of the components of the concrete mixture with water and with each other is performed, but also grinding, grinding of the components of the mixtures. Due to the presence of screw surfaces and helix lines on the outer surface of the roller rods during mixing, the concrete mixture and its components are moved from loading to unloading, where they are unloaded into a means for unloading 8. The process of preparing mortars and concrete mixtures is continuous.

Technical and economic advantages arise due to the manufacture of roller rods in the form of a multiple-helical surface with helical grooves inside and outside the roller rods at an acute angle to the axis of rotation in the form of curved pockets with centers of curvature of the pockets of a curved shape of the screw surface, alternately located outside and inside the cross section of the roller rods, as well as due to the fact that it is simplified to manufacture the roller rods mounted from one rolled into cylindrical coils, connected e with each other along the longitudinal edges, of a tape of the same width, bent in waves along the bend lines placed at an acute angle to its longitudinal edges, with the formation of outer surfaces directed to the same direction at an acute angle to the axis of rotation of the rolling rods of the helical surfaces in the form pockets of curvilinear shape on the outer and inner surfaces, which around the perimeter of the roller rods can be different not only in shape but also in size, while the distance between the fold lines is equal to the sum of the lengths of the perimeter in geometric shapes pockets inner and outer surfaces, said hollow screw-surface rollers rods filled inside the metal or concrete, that expands the technological capabilities of the rod mixer.

Claims (1)

A rod concrete mixer comprising a rotary drive drum and a working body made in the form of non-connected roller rods, characterized in that the working body is made in the form of a multi-helical surface with helical grooves inside and outside the roller rods at an acute angle to their axis rotation in the form of pockets of a curved shape with centers of curvature of pockets of a curved shape of a helical surface, alternately located outside and inside the cross section of the rods of rollers mounted from one rolled into cylindrical coils connected to each other along the longitudinal edges, tapes of the same width, bent in waves along the bend lines placed at an acute angle to its longitudinal edges, with the formation of outer and inner surfaces directed to one side at an acute angle to the axis of rotation of the rods -rolls of helical surfaces in the form of pockets of curvilinear shape on the outer and inner surfaces, which along the perimeter of the roller rods can be different not only in shape but also in size, while the distance between the fold lines is equal to the sum of the lengths of the perimeters of the geometric shapes of the pockets of the inner and outer surfaces, and the hollow helical surfaces of the roller rods are filled inside with metal or concrete.

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