RU2560061C1 - Multichamber vibration mill - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: multichamber vibration mill contains frame (1), drive shaft (2) with installed cam disks (3) and (4) directed diametrically opposite to each other. On cam disks (3) and (4) of the drive shaft (2) two pinion carriers (5, 6) are installed via the bearing assemblies, the carriers are made in form of multibeam sprocket with central seat hole (7) and cradle for grinding chambers in form of peripheral holes (8). In the peripheral holes (8) the removable grinding chambers are installed, they are made in form of the cylindrical containers (9) with lids (10). The lids (10) are pressed to the container of the grinding chamber using the G-clamp (11). Each pinion carrier (5, 6) is connected with frame (1) using at least two resilient elements (13, 14) or (15, 16), respectively. The resilient elements can be made in form of springs out of high carbon steels, and out of high-molecular non-metallic materials. Each bracket (17-20) to which the resilient element (13-16) is fixed, is rigidly connected with frame (1), and is made in form of plate with set of holes to adjust the spring force. The containers (9) of the grinding mills are filled with grinding bodies (22) by 80-90%.EFFECT: mill ensures provision and keeping of the extra fine fraction of milled materials having mineral and organic origin.3 cl, 6 dwg

Description

The invention relates to a device for grinding solid materials of mineral and organic origin and can be used for ultrafine grinding of small portions of the material, mainly in laboratory conditions.

Known laboratory eccentric vibration mill for grinding small batches of material containing grinding chambers - drums mounted by two eccentric sleeves on the motor shaft with the possibility of performing fixed circular oscillations (Copyright USSR No. 113794, class B02C, 17/01, publ. 1958).

Closest to the claimed (prototype) is a multi-chamber vibration mill (patent RU No. 2465961, IPC B02C 19/16, publ. 10.11.2012) containing a drive shaft with diametrically opposite eccentrics and two blocks of grinding chambers, in each of which chambers are connected between by itself and with the drive shaft by means of one carrier mounted on the drive shaft eccentric through the bearing, each carrier made in the form of a multi-beam correct sprocket with a central landing hole and with lodges for grinding chambers at the end rays, the sprocket mounted on the shaft with an angular displacement, ensuring occupancy grinding chambers of one block in the gaps between the grinding chamber of another unit.

A disadvantage of the known vibration mills is the loss of the ultrafine fraction of the crushed materials due to the lack of tightness of the grinding chamber, which reduces productivity and reduces the functionality of the vibration mills, as well as the impossibility of their use in laboratory practice (for studying small portions of the material). In addition, the driver of the multi-chamber vibration mill according to RU patent No. 2465961 is installed only on the eccentric necks of the drive shaft and is not additionally connected to the frame, which negatively affects the balance and reliability of the device.

The technical result of the invention is to provide the possibility of obtaining and preserving the ultrafine fraction of crushed various materials of mineral and organic origin, increasing the reliability of the device and expanding its functionality.

The specified technical result is achieved in that in a multi-chamber vibration mill containing a frame, a drive shaft with diametrically opposite clowns and two grinding chamber blocks, in each of which chambers are connected to each other and to the drive shaft by means of a carrier mounted on the drive shaft eccentric through bearings moreover, each carrier is made in the form of a multi-beam sprocket with a central landing hole and lodges for the installation of grinding chambers on each beam, while the carrier is mounted on according to the claimed technical solution, each carrier is connected to the mill frame using at least two elastic elements, a lodgement for installing grinding chambers on each beam of the carrier made in the form of holes, and grinding chambers are made with covers, hermetically pressed to the chamber with a clamp.

The elastic elements connecting the carrier to the mill frame are made in the form of springs mounted on brackets rigidly connected to the mill frame and made in the form of plates with a set of holes for adjusting the spring stiffness.

To give structural rigidity, the frame of the multi-chamber vibratory mill is equipped with a traverse that fixes the upper bearing of the drive shaft.

The essence of the technical solution is illustrated by drawings, where

- figure 1 presents a General view of a multi-chamber vibration mill with a three-beam drove in a perspective view;

- figure 2 is a top view of figure 1;

- figure 3 is a section along BB in figure 2;

- figure 4 is a view a in figure 3;

- figure 5 is an embodiment of a carrier in the form of a three-beam star;

- figure 6 is a grinding chamber in section.

The multi-chamber vibratory mill comprises a frame 1, a drive shaft 2 with clowns 3 and 4 clad on it, directed diametrically opposite to each other. On eccentrics 3 and 4 of the drive shaft, two carriers, 5 and 6, respectively, are installed through the bearing units.

Each carrier is made in the form of a multi-beam sprocket with a central landing hole 7 and tool holders for grinding chambers made in the form of peripheral holes 8 on each beam. The beams are evenly spaced around the central mounting hole 7. In the peripheral holes 8 of the sprocket, removable grinding chambers are installed, made in the form of cylindrical containers 9 with lids 10. The lid 10 is pressed against the grinding chamber container with a clamp 11 through the gasket 12, creating a sealed volume.

When each carrier in the form of a three-beam sprocket is executed, the total number of grinding chambers is 6. In order to increase the productivity of the vibratory mill, the number of sprocket rays, and hence the grinding chambers, can be increased. Drove 5 and 6 are mounted on the shaft 2 with an angular displacement, which ensures the placement of containers 9 of the grinding chambers of one carrier in the gaps between the grinding chambers of another carrier.

Each carrier is connected to the frame 1 of the mill, using at least two elastic elements 13, 14 or 15, 16, respectively, one end of which is mounted on the corresponding beam of the carrier, and the other on the respective brackets 17, 18 and 19, 20. This connection does not allow the carrier to rotate around the drive shaft 2 and contributes to the balance of the device. The elastic elements can be made in the form of springs made of high carbon steels alloyed with silicon, manganese, chromium, vanadium, and nickel. Elastic elements can also be made of high molecular weight non-metallic materials (rubber, polymeric materials such as volcanoes).

Each bracket (17-20) to which the elastic element (13-16) is attached is rigidly connected to the frame 1 and is made in the form of a plate with a set of holes for adjusting the spring stiffness.

To give greater structural rigidity, the frame 1 of the multi-chamber vibratory mill is equipped with a traverse 21, fixing the upper bearing of the drive shaft 2.

The containers of 9 grinding chambers are 80-90% filled with grinding bodies 22.

Grinding chambers can be made of both metals and various ceramic materials (for example, aluminum oxide, zirconium oxide, tungsten carbide, etc.) in combination with grinding bodies made of various ceramics. This is necessary when grinding materials in which the presence of metal grinding from grinding media and the grinding chamber is not allowed, for example, to obtain highly concentrated ceramic binders.

At the same time, grinding chambers made of various materials and grinding media that are most suitable for grinding a particular material can be installed in the mill.

Multi-chamber vibration mill operates as follows.

The grinding of materials in grinding chambers is carried out in periodic mode. The crushed material is loaded into the containers 9 of the grinding chambers simultaneously with the loading of the grinding balls 22, after which the containers 9 are closed with lids 10 and pressed to create a tight volume with the clamp 11. The drive shaft 2 with the clowns 3, 4 of the vibration mill acts together with the drive as a vibration exciter. The shaft, rotating, makes the carrier 5 and 6, together with the grinding chambers mounted on them, make oscillatory movements along a circular path with a given amplitude. When using frequency control of a vibrating mill electric motor, it is possible to obtain various mill operating modes depending on the rotational speed of the motor shaft, and therefore the oscillation frequency of the grinding chambers. The vibration mill also provides for the possibility of changing the eccentricity of the carrier motion using elastic elements 13-16, which, in combination with frequency control of the electric motor, expands the possible modes of material processing. For a certain time (depending on the given technology of grinding the material), grinding occurs in a hermetically sealed container, in which centrifugal force arises, which leads to the intense abrasion of the grinding media 22 on the crushed material. The sealed volume created in the grinding chamber allows ultra-fine grinding and eliminates the loss of ultrafine fractions.

After the grinding process is completed, the lid 10 from the containers 9 is removed and the crushed material is poured together with grinding balls 22. Then the balls are separated from the crushed material.

Thus, the expansion of the functional capabilities of the vibration mill is ensured, namely: obtaining and preserving the ultrafine fraction of crushed various materials of mineral and organic origin, ensuring the possibility of using the design in laboratory practice for studying small portions of the material, as well as improving the balance and reliability of the device.

Claims (3)

1. A multi-chamber vibration mill comprising a frame, a drive shaft with diametrically opposite eccentrics and two grinding chamber blocks, in each of which the chambers are connected to each other and to the drive shaft by means of a carrier mounted on the drive shaft eccentric through bearings, each carrier being made in in the form of a multi-beam sprocket with a central landing hole and lodges for the installation of grinding chambers on each beam, while the carrier was mounted on a shaft with an angular displacement, providing placement along the chambers of one carrier in the gaps between the grinding chambers of the other carrier, characterized in that each carrier is connected to the mill frame using at least two elastic elements, the lodgements for installing the grinding chambers on each beam of the carrier are made in the form of holes, and the grinding chambers made with covers tightly pressed to the chamber with a clamp. 2. The multi-chamber vibration mill according to claim 1, characterized in that the elastic elements connecting the carrier to the mill frame are made in the form of springs mounted on brackets rigidly connected to the mill frame and made in the form of plates with a set of holes for adjusting the spring stiffness. 3. The multi-chamber vibration mill according to claim 1, characterized in that, to give rigidity to the structure, the frame of the multi-chamber vibration mill is equipped with a traverse that fixes the upper bearing of the drive shaft.

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