RU117428U1 - DEVICE FOR FINE GRINDING OF BULK MATERIALS - Google Patents

Abstract

A device for fine crushing of bulk materials, comprising a housing consisting of a shell with an opening for unloading the crushed product, a bottom with a central opening for the drive shaft, a cover with an opening for feeding the original product and a fixed disk with impact elements located on concentric protrusions , blades for transporting the initial product to the grinding zone, a drive shaft with an accelerating disc, on which impact elements are located in its front part on concentric projections, and the impact elements of the stationary and accelerating discs enter each other's space with a gap of 1 ÷ 2 mm, forming a zone grinding, characterized in that on the inner side of the bottom of the housing, impact elements are fixed along concentric protrusions, which together with impact elements on the back side of the accelerating disc form a second grinding zone inside the housing.

Description

The utility model relates to the technique of fine grinding of bulk materials and can be used in food, chemical, mining and other industries for fine grinding of food products, cement, kaolin, etc.

Known devices for grinding, consisting of a housing, inside which a rotating and fixed disks form a grinding chamber. The disks concentrically arranged shock elements in the form of cylinders, prisms, etc. These devices also consist of a cover, loading and unloading leaks, and a drive with a horizontal shaft on which a rotating disk is mounted (G. Shamborant. Technological equipment for enterprises of the starch industry. M. Light and food industry. 1984, p. 26-28 )

Such mills have several disadvantages, in particular, they do not provide the necessary degree and uniformity of grinding. This is due to the fact that the crushed particles are in the grinding zone for different times and receive a different number of impacts on the shock elements.

Theoretically, some particles can slip through the grinding zone (from loading to unloading) without hitting the shock elements and, therefore, without grinding, leave the grinding zone.

The closest technical solution to the proposed one is a device for grinding bulk materials (patent for utility model RU No. 43363, January 10, 2005), consisting of a shell with an opening for unloading, a drive, which includes a shaft passing through a central hole in the bottom, covers with boot hole, a fixed disk with shock elements and a booster disk with shock elements mounted on the shaft. Impact elements of the disks are located on concentric protrusions and, when assembled with a gap of 1-2 mm, are joined to each other, forming a grinding zone. The initial product enters the grinding zone from the center of the disc using blades. In the grinding zone, the particles of the initial product are crushed by impact of a movable element, impact on a stationary element, impact on each other. In the gaps between the shock elements, the product, crushed, moves to the periphery of the disks and crushed into the device body, where it is captured by air and carried out of the apparatus through the discharge opening.

The air pressure inside the apparatus is created due to the fan effect formed by the rotation of the disk.

Such shredders work in industry, but have a significant drawback. In the case of even a slight increase in resistance at the product outlet, which may arise from various reasons, for example, a slight increase in the moisture content of the product, a slight increase in the quantity of the supplied product, etc., a part of the crushed product remains inside the device and begins to accumulate between the case wall and the back of the accelerating disk . Thus, not all product entering the device is subjected to grinding. In addition, as it accumulates, the product crumbles, is pressed, and the product heats up due to friction on the back of the accelerating disk. Next, all the components and parts of the grinder are heated. The heating temperature is high, which can lead to a deterioration in the useful properties of the crushed material. So, for example, during the grinding of organic substances, denaturation of protein substances can occur. To avoid this, you have to stop the machine, disassemble and clean it of the product, wait for it to cool, and then start again.

The proposed device for fine grinding of bulk materials completely eliminates the possibility of the formation of stagnant zones for the crushed product in the back of the accelerating disk without the use of external additional devices.

The technical result of the utility model consists in the complete exclusion of the possibility of the formation of stagnant zones for the product to be ground in the back of the accelerating disk without the use of external additional devices, which will lead to the grinding of the entire product entering the device without changing its properties.

The technical result is achieved due to the fact that the device for fine grinding of bulk materials, comprising a housing consisting of a shell with an opening for unloading the crushed product, a bottom with a central hole for passage of the drive shaft, a cover with an opening for supplying the original product and a fixed disk fixed to it with shock elements located on concentric protrusions, blades for transporting the starting product to the grinding zone, the drive shaft with an accelerating disk, on which its parts on concentric protrusions are shock elements, and the shock elements of the fixed and accelerating disks enter each other's space with a gap of 1-2 mm, forming a grinding zone, characterized in that it contains a second grinding zone formed by concentric protrusions with shock elements located on the inside of the bottom of the case and the back of the booster.

The utility model is illustrated by drawings, in which figure 1 schematically shows a cross section of a General view of the device; figure 2 is a frontal section bB in figure 1; figure 3 is a front view of the device.

The names of the positions in the drawings are as follows:

1 - accelerating disk;

2 - the bottom of the body;

3 - concentric protrusions with shock elements on the accelerating disk;

4 - concentric protrusions with shock elements on the bottom;

5 - shock elements on the cover;

6 - holes in the Central part of the accelerating disk;

7 - hole in the center of the cover;

8 - blades on the outer side of the accelerating disk;

9 - blades on the inside of the accelerating disk;

10 - housing cover;

11 - hole;

12 - pipe;

13 - the housing of the device.

The second grinding zone is formed in the space between the back side of the accelerating disk 1 and the bottom 2 of the housing 13 (figure 1). For this, concentric protrusions with shock elements 3 are made on the rear side of the accelerating disk, the bottom of the housing acts as a fixed disk, on which concentric projections with shock elements 4 are also made. Thus, the accelerating disk 1 is designed with two-sided production of shock elements 3, which have a gap 1-2 mm. mounted on one side with shock elements made on the inside of the bottom of the body, on the other hand with shock elements 5 on the cover 10 (Fig.1) of the device. For the passage of the initial product to the second grinding zone in the Central part of the accelerating disk, holes 6 are made (Fig. 1,2).

For feeding the product inside the device, a hole is located on the lid 7. To get the initial product into the grinding zone, blades 8 and 9 rotating along with the accelerating disk are located on the front and back sides of the accelerating disk. To exit the crushed product into the housing 13, a hole 11 is provided to which a pipe 12 is attached.

The device operates as follows: the initial (crushed) product through the hole in the center of the cover 7 (Fig. 1) enters the device on the rotating front part of the accelerating disk, part of the product through the windows 6 in the central part of the accelerating disk 1 enters the back of the accelerating disk. The original product blades 8 and 9 on the accelerating disk is thrown into the grinding zone from the outer and inner sides of the accelerating disk. The product enters for grinding into the gap between the shock elements of the internal movable and fixed protrusions. Then the product enters for subsequent grinding on the shock elements of the middle protrusion, etc., the product advances to the external shock elements. When leaving the grinding zone, the crushed product and the air captured by the shock elements acquire a rotational movement and fall into the hole 11 and the pipe 12 (Fig. 3), which are tangent to the device body 13 and are removed from the device.

The main technical advantages of the proposed device are as follows.

The absence of stagnant zones inside the device, which makes it possible to grind all the product received for grinding. A significant reduction in the possibility of overheating of the crushed product, which can lead to a change in the properties of the product.

Claims (1)

A device for fine grinding of bulk materials, comprising a housing consisting of a shell with an opening for unloading the crushed product, a bottom with a central hole for the drive shaft passage, a cover with an opening for supplying the initial product and a fixed disk mounted on it with shock elements located on concentric protrusions blades for transporting the initial product into the grinding zone, the drive shaft with an accelerating disk, on which in front of it on concentric protrusions located There are shock elements, and the shock elements of the fixed and accelerating disks enter each other's space with a gap of 1 ÷ 2 mm, forming a grinding zone, characterized in that on the inner side of the bottom of the casing shock elements are strengthened along with concentric protrusions, which together with the shock elements on the rear side of the accelerating disk form a second grinding zone inside the housing.