CZ201558A3 - Grinding disk for grinding rubber powder - Google Patents

Abstract

A grinding disc with a set of knives (2) for grinding and activating rubber powder placed on opposite grinding heads of a rubber tear mill so that in the first grinding head the knives are placed in the gaps (4) between the knives (2) in the second grinding head. The individual knives (2) have a rectangular cross-section with profiled side walls and their length increases in the individual sets from the grinding axis, with gaps (4) between the knives (2) to allow the material to move away from the inlet. The heads and / or sides of the individual knives (2) and the gaps (4) and other gaps (5) are preferably provided with a knurled and / or serrated finish (6).

Description

-1- & = 3Τ.

Grinding disc for grinding and activating rubber powder.

Technical field

The invention relates to a grinding disk for grinding and activating rubber powder disposable on opposite grinding heads of a rubber tear mill so that in the first grinding head the knives are placed in the gaps between the knives in the second grinding head. The knives are suitable for grinding material, especially rubber granulate, for use as an additive in asphalt binders.

Background Art

For milling highly elastic materials such as rubber, a number of mills and disintegrators are known which are based on different milling methods. The basis of such mills and disintegrators is the grinding system, melting out of individual knives, a set of knives or parts - segments that are either in counter-motion or have one part fixed and the other movable. The different design of mills and disintegrators together with the choice of the appropriate type of milling parts is usually achieved by combining cutting, tearing and / or crushing the material according to the desired effect. An exemplary high-speed rubber tear mill is described in utility model Ζζ CZ 27279.

Solutions are also disclosed, for example, in CN 201128221, CZ 185467, GB. These solutions are based on a different shape of the knives. Grinding knives are usually smooth and their walls are parallel.

As a rule, it is difficult to choose a combination of disintegration processes so that the final product has the desired quality in grain size, grain shape and grain surface properties, while maintaining the optimum performance and cost of the disintegration process. These physical properties of the product are key parameters of the disintegration process affecting the usability of the produced material. -2-

SUMMARY OF THE INVENTION The aforementioned drawbacks are largely eliminated by the grinding disk for grinding and activating the rubber powder disposable on opposite grinding heads of the rubber tear mill so that in the first grinding head the knives are placed in the gaps between the knives in the second grinding head or are only adjacent to each other , according to the invention. The essence of this is that the individual knives have a rectangular cross-section with profiled side walls and their length increases in the individual sets away from the grinding axis, with gaps between the knives to allow the material to move away from the inlet.

The heads and / or sides of the individual knives are preferably provided with a knurled and / or serrated finish. Also, the gaps between the individual blades are preferably grooved and / or serrated. In the gaps between the individual knives, there are preferably depressions.

The proposed knives on the grinding disk allow grinding of highly elastic material such as rubber granulate. The material is disintegrated by the shear force under the tensile strength which causes the material to tear to smaller parts. The essence of the technical solution is constructional modifications of knives, which allow such disintegration with the power usable for industrial production.

The principle of the grinding knives is their mounting in the grinding heads of a high-speed rubber tear mill.

The individual knives have a rectangular cross-section, with different lengths varying outwardly from the grinding axis. Respectively, the number of gaps and their length vary in individual sets of knives away from the grinding axis.

The individual knives have a profiled shape. The blade profile allows the grinding of the ground material and its gradual tearing when in contact with the knife rotating in the opposite direction. -·-· · · · · · · · · · · · · · · · ·

The grinding blades are designed so that the gaps between the individual blades allow the material to move away from the inlet, i.e. the center of the grinding head, and to gradually disintegrate the material into a finer fraction.

The heads and / or sides of the individual knives have a knurled or serrated finish that increases the contact area of the ground material with the individual knives.

The gaps between the knives have a knurled or serrated finish that increases the contact area of the ground material with the grinding knife set. Depressions are provided in the gaps between the individual blades, allowing the recesses to grind the ground material during grinding and disintegrating it. The depressions between the individual teeth also increase the total number of knife edges, thus increasing the grinding performance. The advantage of the solution according to the invention is primarily the production of a material which is very suitable for use as an additive in bituminous binders. Grains of produced rubber powder have a high specific surface area, with the same fraction as conventional disintegration methods. The shape of the produced grain can be described as flake rather than cubic. The specific surface area is critical to the quality of the bond between the asphalt binder and the additive.

Another advantage of the sets of milling knives is their simple manufacture.

Another advantage is the performance of the grinding equipment fitted with grinding equipment with less energy consumption for the grinding process.

Another advantage is the safety of the proposed treatment, the material is fed through the center of the grinding head and there is no risk of operator contact with parts of the mill having a high angular velocity.

The grinding teeth are mounted so as to allow unmanned grinding of the material to achieve the desired quality of the material produced. Last but not least, easy cleaning and replacement of grinding blade sets is advantageous. and

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The grinding disc for grinding and activating the rubber powder of the present invention will be described in more detail on the specific embodiment with the aid of the accompanying drawings, wherein at 8br. 1 shows the embodiment of the knives on the disk including profiling and surface finishing by spacing; 1a is a detail of the knives shown. To ftbr. 2 shows the design of the knives on the disc without profiling and on the 8br. Fig. 2a shows a detail of the knives. On ®br. 3 shows the design of the knives on the disk including the profiling and surface treatment of the knives by serrations and spacing gaps, and on the FIG. 3a shows a detail of the knives. Examples of carrying out the invention

The grinding disk for grinding and activating the rubber powder consists of a knife and knives 2 with knives 2 which are provided with profiling 3. Between the knives 2 there are gaps 4 guided perpendicular to the longitudinal axis of the knives 2 and a further gap 5 between the blades 2 parallel to the longitudinal sowing of the blades 2. The blades 2 are provided with a coating 6 and in the gaps 4 and 5 there are depressions 7 '

The knives 1 * of the knives - 2 are fitted with individual knives 2. The knives 2 are in the shape of a cuboid and carry the tension to om " (milled material. The knives 2 in one grinding grip fit into the gaps 4 between the knives 2 & The blades 4 are formed by depressions into the lateral sides of the blades 2. The gaps 4 between the blades 2 and 4 are perpendicular to the longitudinal axis of the blades 2, allowing for counter-movement of the other blades 5 between the blades 2 parallel to the longitudinal axis of the blades 2 they allow the material to pass to the next row of knives 2 and gradually to a finer grinding of the material, the knives 2, the gaps 4 between the knives 2 perpendicular to the longitudinal axis of the knives 2, the other gaps 5 between the knives 2 parallel to each other - the longitudinal axis of the knives 2, can be treated with 6, spaced, or serrated, which increases their contact area with the ground material, along with the profiling of the knives 2, the surface treatment 6 ensures the activation of the surfaces of the ml The depressions 7 in the gaps 4, 5 increase the number of edges of the blades 2 and allow for a higher performance and finer grinding of the material in one milling cycle. -5- The individual knives 2 are milled into the die 1 in the die 1 together with the iwoWw 2 knives 3 positioning. The location and size of the individual knives 2 define the gap sizes 4 between the knives 2 perpendicular $ c * o · r, / pk longitudinal the blades 2 and the other gaps 5 between the blades 2 parallel to the longitudinal eight blades 2. Depressions 7 are then drilled into the blades 2 in the gaps 4, 5. The grinding blades 2 are then mounted on the grinding heads, that the grinding blades 2 from one of the scaffolds fit into the opposite gaps 5

Between the blades 2 in parallel with the longitudinal axis of the blades 2. The grinding blades 2 are positioned so that the grinding blades 2 are in close proximity to one another with a gap allowing grinding the material to a fine fraction.

Industrial usability:

The grinding disk for grinding and activating the rubber powder according to the proposed solution can be used advantageously in rubber disintegrators. The proposed solution is an efficient method that produces a quality exceeding the currently used rubber granulate. The use of rubber as an additive in bituminous binders has been an industrially used method for improving the selected properties of asphalt binders for many years.

Claims (4)

PATENT CLAIMS 1. A grinding disc for grinding and activating rubber powder disposable on opposed grinding heads of a rubber tear mill so that in a first grinding head the knives on the disc are placed in the interstices between the knives in the second grinding head, characterized in that the individual knives ( 2) the grinding disk has a rectangular cross-section with profiled side walls and their length increases in the individual sets away from the grinding axis, with gaps (4) between the knives (2) to allow the material to move away from the inlet. A grinding disk according to claim 1, characterized in that the heads and / or sides of the individual knives (2) have a grooved and / or serrated finish (6). A grinding disk according to claim 1 or 2, characterized in that the disk surface in the gaps (4), 11 ' 4, the grooves and / or serrations are perpendicular to the longitudinal axis of the blades (2) and in the gaps (5) of the parallel 3 longitudinal blades (2). Grinding disc according to any one of claims 1 to 3, characterized in that there are depressions (7) in the gaps (4) and other gaps (5) between the individual blades (2).