RU228946U1 - Hammer centrifugal mill - Google Patents

Abstract

The utility model relates to grinding equipment. A hammer centrifugal mill is proposed, which comprises a housing, in the grinding chamber of which a rotor is located, mounted on a horizontal drive shaft, wherein the inlet for feeding the processed material is located in the end wall of the housing on the side of the shaft drive, and the mill is equipped with segments of replaceable armor. According to the utility model, in the grinding chamber of the housing, successively arranged coaxial grooves of different diameters are made with the formation of flat end surfaces and internal cylindrical surfaces of different diameters with an increase in the diameter of the grooves away from the inlet, and the rotor is made in the form of a cascade of rotor sections of different diameters successively mounted on the shaft. A group of end armors is installed on the end surfaces of the body grooves, and a group of radial armors is installed on the inner cylindrical surfaces of the body grooves, wherein the segments of the radial armors interact with each other using a butt joint on their side surfaces and are pressed against the end surfaces of the body grooves. The utility model ensures an increase in the degree of raw material grinding in one grinding chamber. 1 c.p. fil. 6 ill.

Description

The utility model relates to equipment for crushing small-sized raw materials and rocks of weak and medium strength into "flour" and can be used in the chemical, processing, food, metallurgy and mining industries.

A known hammer centrifugal mill comprises a housing, in the cavity of which a rotor is located, mounted on a horizontal drive shaft, wherein the inlet for feeding the material being processed is located in the end wall of the housing on the drive side of the shaft, and the mill is equipped with segments of replaceable armor (see US Patent No. 10632471 B2, published on 04/28/2020).

The disadvantage of the known mill is low grinding efficiency due to the use of only one grinding stage.

The technical challenge is to achieve a high degree of grinding.

The technical result consists in increasing the degree of raw material grinding in one grinding chamber.

The technical problem is solved and the technical result is achieved by the fact that the hammer centrifugal mill comprises a housing, in the grinding chamber of which a rotor is located, mounted on a horizontal drive shaft, wherein the inlet for feeding the material being processed is located in the end wall of the housing on the drive side of the shaft, and the mill is equipped with segments of replaceable armor, wherein in the grinding chamber of the housing there are successively arranged coaxial grooves of different diameters with the formation of flat end surfaces and internal cylindrical surfaces of different diameters with an increase in the diameter of the grooves towards the inlet, and the rotor is made in the form of a cascade of rotor sections of different diameters successively mounted on the shaft, a group of end armors is installed on the end surfaces of the grooves of the housing, and a group of radial armors is installed on the internal cylindrical surfaces of the grooves of the housing, wherein the segments of the radial armors interact with each other by means of a butt joint on their side surfaces and are pressed against the end surfaces body grooves.

The technical result is also achieved by the fact that the segments of the radial armor can be pressed against the end surfaces of the body grooves by segments of the end armor, attached to the adjacent end surface of the groove with a larger diameter using a bolted connection.

The utility model is explained with the help of drawings.

Fig. 1 shows the external appearance of the mill;

Fig. 2 is an enlarged view of A in Fig. 1;

Fig. 3 - side view of the mill;

Fig. 4 is an enlarged view B of Fig. 3;

Fig. 5 shows an isometric view of the grinding chamber of the housing;

Fig. 6 - front view of the grinding chamber.

The hammer centrifugal mill comprises a housing 1, in the grinding chamber 2 of which a rotor 3 is located, mounted on a horizontal drive shaft 4. In the end wall of the housing 1 on the side of the drive shaft 4, an inlet opening 5 is located for feeding the material being processed. In the grinding chamber 2 of the housing 1, successively arranged coaxial grooves of different diameters are made with the formation of flat end surfaces 6, 7 and 8, as well as internal cylindrical surfaces 9, 10 and 11 of different diameters with an increase in the diameter of the grooves away from the inlet opening 5. The rotor is made in the form of a cascade of rotor sections 12, 13 and 14 of different diameters successively mounted on the shaft. On the end surfaces 7 and 8 of the grooves of the body 1, a group of segments of end armors 15 is installed, and on the inner cylindrical surfaces of the grooves of the body, a group of segments of radial armors 16 is installed. The segments of the radial armors 16 interact with each other by means of a butt joint on their side surfaces, which is made in the form of a projection 17 on one side of the segment and a ledge 18 on its opposite side. The projection 17 of one segment enters the ledge 18 of the adjacent segment, which are laid sequentially on the cylindrical surfaces 9, 10 and 11 along their entire circumference and are pressed against the end support surfaces. The end surfaces 6, 7 and 8 of the body and the surfaces of the segments of the end armors 15, attached to the end surfaces 7 and 8, can be used as the end support surfaces of the radial armors 16.

The segments of the radial armors 16 can be pressed against the end support surfaces by the segments of the end armors 15, which are attached to the adjacent end surface 7 and 8 using bolts 19.

The utility model is implemented as follows. The material to be ground enters the grinding chamber 2 of the mill through the branch pipe from the drive (electric motor) side into the inlet opening 5 and exits through the branch pipe from the opposite side of the housing 1. The grinding chamber 2 is shaped as 3 cylinders with an increasing diameter, in which armors 15 and 16 are installed. A rotor 3 with a shaft 4 is installed in the grinding chamber 2, which is secured using a bearing housing and is connected to the electric motor using a coupling protected by a casing.

Segmented armor 15 and 16 of the grinding chamber 2 allow for the fastest possible replacement of the worn-out part of the mill's working parts, which reduces labor costs for operating this crusher and improves its performance characteristics. Material consumption is reduced by replacing only the part of the armor that is subject to significant wear.

The segmented armor consists of 3 contours, a multiple of the number of rotors used, and is divided into 12 duplicate segments.

In the first circuit there is only one type of armor: radial armor 16 of the first rotor section 12, pressed against the end surface 6 of the body 1. In the second circuit - end armor 15 of the second rotor section 13 and radial armor 16. In the third circuit - radial armor 16 of the third rotor section 14 and end armor 15.

The armor 15 and 16 are fastened in the following manner: the segments of the radial armor 15 interact with each other by means of grooves that form projections 17 and ledges 18, and also interact with the end armor 16 that press the radial armor 15 by means of a bolted connection that also fastens the end armor 15. Due to this type of armor fastening, it becomes possible to partially dismantle the worn part of the armor, which significantly reduces the metal consumption and labor costs of repair work.

The use of a multi-stage design of rotor 3 and grinding chamber 2 significantly increases the degree of grinding due to the use of the type of interaction of working elements of different types on one rotor: radial cylindrical and end flat, as well as the efficiency of grinding while reducing equipment downtime due to the possibility of quickly changing working elements (armor).

Claims (2)

1. A hammer centrifugal mill comprising a housing, in the cavity of which a rotor is located, mounted on a horizontal drive shaft, wherein the inlet opening for feeding the material being processed is located in the end wall of the housing on the drive side of the shaft, and the mill is provided with segments of replaceable armor, characterized in that in the cavity of the housing there are successively arranged coaxial grooves of different diameters with the formation of flat end surfaces and internal cylindrical surfaces of different diameters with an increase in the diameter of the grooves towards the inlet opening, and the rotor is made in the form of a cascade of rotor sections of different diameters successively mounted on the shaft, a group of segments of end armors is installed on the end surfaces of the housing grooves, and a group of segments of radial armors is installed on the internal cylindrical surfaces of the housing grooves, wherein the segments of the radial armors interact with each other by means of a butt joint on their side surfaces and are pressed against the end support surfaces. 2. A mill according to item 1, characterized in that the segments of the radial armor are pressed against the end support surfaces by segments of the end armor, attached to the adjacent end surface of the groove with a larger diameter using a bolted connection.

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