RU2396165C2 - Mixer of rubber crumb with binder - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to production of construction materials from polymer materials, particularly from rubber crumb, namely to mixers. Device to mix rubber crumb with binder comprises cylindrical case accommodating revolving rotor with screw and blades. Note that said case incorporates intake funnel and fluid component feed unions and outlet hole. Said screw and blades are arranged along conical line with pitch decreasing towards outlet. The blades, last along mix transfer, is mounted perpendicular to case lengthwise axis, while blade, second to last, is arranged to change mix transfer direction. Note also that rotor can be detached with flange support on the side of discharge hole. Mixer is furnished with moving baffle jointed with counterweight.

EFFECT: simple design, ease and disassembly, high quality of mixing.

2 cl, 3 dwg

Description

The invention relates to techniques for the production of building materials from polymeric materials, in particular from crumb rubber, and in particular to mixing devices.

The inventive device is intended for mixing rubber crumb with a viscous binder and other fluid components with heating in the process of mixing the formed mass before filling in the mold.

Known continuous mixer for composite building materials based on petroleum bitumen (RF patent No. 2247654, BV 7/34), comprising a housing with a heating jacket, two rotors mounted in the housing rotatably in one direction, made in the form of shafts with screws and in series installed behind the screws along a helical line at an angle to each other with cams with pressure side and end surfaces.

The known device does not imply a convenient and quick disassembly for cleaning from a quick-hardening mixture at a stop time, and also does not have simple and convenient means of controlling the performance and temperature of the mixture.

Closest to the proposed is a continuous mixer according to A.S. USSR No. 338240, containing a cylindrical body with a jacket, a shaft with blades mounted in it. Known mixer is designed to mix rubber crumb with a viscous binder, dye and catalyst. This mixer has an excessively complex design and as a result there are inconveniences when cleaning at the time of stopping.

The task to which the proposed technical solution is directed is to simplify the design without compromising the quality of mixing and to create conditions for quick and convenient disassembly for cleaning at a stop time, as well as providing simple convenient control of the performance and temperature of the mixture at the outlet of the device.

The problem is solved in that in a rubber crumb mixer with a binder, including a cylindrical body, a rotor with a feeding screw and blades rotatably mounted therein, the body being equipped with a receiving funnel and fittings for supplying liquid components and an outlet, according to the invention, the screw and blades installed along a helical line with a step decreasing towards the outlet, and the last blade in the direction of the mixture is installed perpendicular to the longitudinal axis of the housing, and after the bottom blade is installed at an angle with the possibility of changing the direction of movement of the mixture, and the rotor is quick-detachable together with a flange support from the discharge opening, in addition, the mixer is equipped with a movable damper associated with the counterweight. The drive is made adjustable in rotation speed.

Distinctive features of the proposed technical solution are:

- execution on the shaft of the feeding auger and individual blades located along a helical line with a step decreasing towards the outlet, and the blades are made in the form of flat plates installed at certain angles of attack; the angle of installation of the blades coincides with the direction of the helix, the step decreasing towards the exit of which compresses the total flow of the mixture. This ensures the heating of the mixture due to the arising friction forces in the material due to the significant velocity gradient of the various layers;

- supplying the outlet on the cylindrical surface of the housing with a damper with a counterweight, regulating the pressing of the damper, which changes the pressure of the mixture on the cylindrical body of the mixer, which determines the temperature of the mixture at the outlet;

- intensive narrowing of the flow on the last to the exit turn of the helical line of the installation of the blades due to the location of the penultimate along the movement of the mixture of the blades with the possibility of changing the direction of movement of the mixture, which provides compression of the mixture and the displacement of its layers (grinding), and this, in turn, leads to an increase mixing intensity of the mixture;

- installation of the last blade perpendicular to the longitudinal axis of the housing with a minimum clearance, which ensures cleaning of the end surface of the mixture during operation;

- supplying the device with an adjustable drive, providing a change in the speed of rotation of the shaft;

- installation of a rotor, including auger and vanes, with the possibility of quick dismantling for cleaning.

The invention is illustrated by drawings, where in Fig.1 shows a General view of the device; figure 2 is a section aa in figure 1; figure 3 - arrangement of the blades.

The crumb rubber mixer with a binder includes a cylindrical body 1 with a receiving funnel 2 for crumb rubber and fittings 3 for supplying a liquid (viscous) binder and other components, for example, dye. The rotor 4 is located on the axis of the cylindrical housing 1, on which a screw 6 and blades 7 are arranged sequentially towards the outlet 5. The outlet 5 is blocked by a shutter 8 connected by a lever 9 with a counterweight 10. The drive 11, adjustable in speed of rotation of the output shaft, transmits torque through a spline connection 12 to the rotor 4, the front (from the discharge opening side) support 13 of which is mounted in the quick-detachable flange 14.

The mixing blades 7 are mounted on a helix with decreasing step towards the hole 5 (Figure 3). The blades 7 are made in the form of flat plates installed at certain "angles of attack."

The angle of installation of the blades 7 coincides with the direction of the helix, the pitch of which decreases towards the exit (positive angle of attack). The penultimate one towards the exit of the blade 15 (Figure 3) is mounted at a negative angle (with the possibility of changing the direction of movement of the mixture) to direct the flow in the opposite direction. The last blade 16 is installed parallel to the end surface of the flange 14 with a minimum clearance for cleaning the end surface of the mixture.

The device operates as follows.

The crumb rubber is poured into the loading funnel 2 and when the rotor 4 is rotated, it is fed in the direction of the outlet 5 by the screw 6 into the mixing zone by the blades 7.

Viscous binder and other components (dye, catalyst) are fed into the mixing zone through fittings 3.

Due to the large circumferential speeds of the rotor 4 between the rubber crumb on the one hand, the blades 7 and the inner walls of the housing 1 on the other hand, as well as between different layers of the mixture (due to the velocity gradient), significant friction forces arise, which increases the temperature of the mixture at the outlet of the mixer in order to create the most favorable conditions for the initial stage of the binder polymerization process.

Installing the penultimate along the movement of the mixture of the blade 15 (Figure 3) at a negative angle (the blade directs part of the flow of the mixture towards the general direction of flow) provides additional compression of the mixture and grinding its layers, which increases the intensity of mixing of the mixture.

The valve 8 determines the resistance to the output of the mixture and thereby the degree of temperature increase.

Joint regulation of the position of the counterweight 10 and the speed of the actuator 11 determines the necessary mode of operation of the mixer.

The stop of the mixer requires immediate cleaning of the rotor 4 and the surfaces of the housing 1 in contact with the binder. For this purpose, the rotor 4 is made quick-detachable together with the flange 14 and the support 13.

After cleaning, the rotor 4 is installed in place, and the mixer is prepared to wait for the next start.

Claims (2)

1. A rubber crumb mixer with a binder, including a cylindrical body, a rotor with a feeding screw and blades rotatably mounted therein, the body being equipped with a receiving funnel and fittings for supplying liquid components and an outlet, characterized in that the screw and blades are screw mounted lines with a step decreasing towards the outlet, the last blade being installed perpendicular to the longitudinal axis of the body along the mixture, and the penultimate blade is installed with the possibility of To change the direction of movement of the mixture, while the rotor is quick-detachable together with a flange support on the side of the discharge opening, in addition, the mixer is equipped with a movable damper associated with the counterweight. 2. The mixer according to claim 1, characterized in that the drive is made adjustable in speed.

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