RU216512U1 - Mill - Google Patents

Abstract

The utility model relates to crushing and processing, construction and equipment for the production of materials used in the building materials industry, in mining, chemical and metallurgical industries, and can be used in the enrichment and processing of mineral raw materials. A mill is proposed in which the initial material is loaded in batches. The mill of the proposed design includes a frame and a base attached to it, a drum in which outlet holes are made in its lower part, a rotor bowl with radial ribs, a support shaft, a shaft jacket, an electric motor with two output ends, stuffing box covers, bearing assemblies and bearing supports, a safety clutch located between the rotor bowl and the lower end of the motor shaft, bevel gears and wheels placed in capsules, which protects gears and wheels from dust-like abrasive particles of crushed material on the tooth surface, reduces their wear. The kinematic transmissions of the branches of a closed loop are made with a kinematic mismatch, which leads, when transferring torques of different magnitudes along its upper and lower branches, to the emergence of the so-called "circulating" energy. This makes it possible to use it for additional force action on pieces and particles of the circulating material, which leads to a reduction in power consumption. Placement inside the capsules of bevel gears will improve the performance and operational performance of the device.

Description

The utility model relates to crushing and processing, construction and equipment for the production of materials used in the building materials industry, in mining, chemical and metallurgical industries, and can also be used in the enrichment and processing of mineral raw materials and industrial waste.

As an analogue, we can consider a dry grinding mill (SU 1828412 A3, 07/15/1993), in which a different approach is implemented to ensure guaranteed unloading of grinding products through the screening surfaces of the rotor. The design includes special cutouts made in the fins of the rotor, which provide a more complete contact of the moving material with the screening gratings. The intensification of the unloading process occurs due to the use of additional screening surfaces in the fixed housing, while blocking the gap between the rotating bowl 1 and the fixed housing is carried out through the use of an additional horizontal ring 2 of the rotor, which is located at a minimum distance from the fixed horizontal ring 3; an additional fixed cylinder 4 with screening surfaces is installed directly on this ring.

The disadvantage of the mill of this design is the relatively high specific energy consumption.

Close in technical essence of the utility model is the "Dynamic self-grinding grinder" Pat. for invention No. 2465960 of the Russian Federation, IPC B02C 13/14, Appl. 02/17/2011; publ. 11/10/2012, bul. No. 31.

The disadvantage of this technical solution is the intense wear of particles of abrasive material of the rotating V-belt pulleys and drive belts when they hit and deposit on their surfaces, which leads to their premature failure, reduced durability and operational performance.

The objective of the developed technical solution is to increase the durability, performance and operational performance of the mill.

This technical result is achieved by the fact that the mill contains a frame, a drum with holes made in its lower part, a rotor bowl with radial ribs, a support shaft, a shaft jacket, an electric motor with two output shaft ends, a protective jacket, stuffing box covers, bearing assemblies and bearing supports, a safety clutch located between the rotor bowl and the lower end of the motor shaft, kinematic transmissions made with a kinematic mismatch, characterized in that capsules are attached to the frame and the base fixed to the frame, inside which bevel gears are mounted at the ends of the motor shaft, meshed with bevel gears mounted on the hub of the rotor bowl and on the drum.

The proposed device is illustrated in Fig. 1, 2 and 3, which show the mill of the proposed design.

The mill contains a frame 1, to which the base 2 is rigidly attached (Fig. 1). Rack 5 is attached to base 2 by means of bolted connections, to which electric motor 4 is connected by means of bolted connections, having two output shaft ends. A safety clutch 5 is mounted on the lower part of the shaft of the electric motor 4, designed to disconnect the shaft of the electric motor 4 from overload when transmitting torque to the rotor bowl 13. On the shaft of the safety clutch 5, a drive bevel gear 6 is mounted using a key connection. On the base 2, the support shaft is rigidly fixed 10, on which, with the help of bearings 11, the rotor bowl 13 is mounted, designed to transfer kinetic energy to pieces and particles during the rotation of the rotor bowl 13. The upper end of the support shaft 10 is fixed to the upper part of the frame 1 with the help of a nut 31.

On the support shaft 10, with the help of bearings 20, a protective jacket 12 is mounted, designed to protect the support shaft 10 from wear and which is connected to the driven bevel gear 9 with the help of bolted connections. The rotor bowl 13 is evenly divided into six segments using radial ribs 14. On the outer surface of the hub of the rotor bowl 13, a driven bevel gear 8 of the drive of the rotor bowl 13 is mounted using a keyed connection.

On the upper part of the motor shaft 4, a drive bevel gear 7 of the drum drive 16 is mounted by means of a key connection. source material. The driven bevel gear 9 is bolted to the drum 16. Holes 21 are made on it, allowing the cavity of the drum 16 to be loaded with the starting material (Fig. 2). In the upper part of the frame 1, the struts 18 are rigidly attached, on which the thrust bearing 19 rests, designed to absorb the load created by the weight of the drum 16, the driven bevel gear 9 and the weight of the initial material loaded into the drum 16.

In the lower part of the drum 16, outlet holes 17 are made, designed to evacuate particles through them that are destroyed as a result of their interaction with each other and have reached sizes less than the diameter of these holes.

The upper capsule 22 is attached to the upper part of the frame 1 by means of bolted connections, the tightness of which is ensured by the installation of stuffing box covers 23 and 24 on its ends. using a clamping bolt 26. To ensure the loading of the source material into the drum 16, inlet holes 34 are made on the upper surface of the upper capsule 22 (Fig. 3). To remove accumulated dusty abrasive particles that may be formed during the grinding of the material, a threaded plug 25 is provided on the lower part of the upper capsule 22.

The lower capsule 27 is attached to the base 2 with the help of bolted connections. The tightness of the lower capsule 27 is carried out by attaching to its ends with the help of bolted connections of stuffing boxes 28 and 29.

For ease of installation, the lower capsule 27 is divided into two semi-capsules 30 and 33, which are connected to each other by means of bolted connections. The mill has a closing kinematic mechanism formed by an electric motor shaft 4 with its two output ends, a rotor bowl 13, a drum 16 with material in its cavity and kinematic gears between them. Moreover, the gear ratios between one lower end of the motor shaft 4 and the rotor bowl 13, the upper end of the motor shaft 4 and the drum 16 are not equal to each other, thus forming a kinematic mismatch of the closed loop branches.

The mill of the developed design works as follows.

Initially, the initial material is loaded into the drum 16 through the loading holes 34 and 21 in portions. In the process of working on the bowl of the rotor 13, an updated vertical column of material is constantly formed. When the electric motor 4 is turned on, the pieces of the material to be ground, located in the cavity of the bowl-shaped rotor 13, when interacting with the ribs 14, will begin to move towards its periphery under the action of centrifugal force, while being pressed against them due to these forces. Once in the active zone 30, which is formed only from the moment the mill is put into operation, they will begin to collapse due to impacts, splitting and abrasion during their interaction with each other, shrinking in size. Particles of destroyed material, with the dimensions of the outlet holes 17 smaller than their diameters, will be evacuated and accumulated in a receiving hopper (not shown) or on a subsequent vehicle. Particles of material larger than the dimensions of the outlet holes 17 will re-move in the cavity of the drum 16 along an ascending helix and then, together with the original lumpy material and partially crushed earlier, will fall into the active zone 30, where they will be subjected to repeated destruction and size reduction.

At the same time, due to different gear ratios of the lower and upper branches of the closed circuit of the dynamic self-grinding mill, obtained by installing replaceable bevel gears 6 and 7 with a different number of teeth of the drives of the rotor bowl 13 and drum 16, installed at the output ends of the motor shaft 4, there will be an accumulation and lag for each revolution of their angular velocities. Due to this lag, a kinematic discrepancy between the rotation of the rotor bowl 13 and the drum 16 is formed. Due to the kinematic discrepancy between the gears of the drive of the rotor bowl 13 and the drive of the drum 16, the phenomenon of energy circulation will occur, which will be used for additional force impact on the pieces and particles of the circulating material, which will lead to a reduction in electricity consumption.

Upon reaching the calculated maximum torque on the rotor bowl 13, determined by the elastic deformation of the torsion of the material of the motor shaft 4, the safety clutch 5, installed between the electric motor 4 and the rotor bowl 13, is disengaged and the load is relieved in the closed loop kinematic circuit. After that, the safety clutch 5 closes again, and the circuit system returns to its original state, in which there is no lag in the rotation speed between the output end of the motor shaft 4 and the rotor bowl 13.

After this cycle, the process is repeated in the same sequence. Further, the working process is repeated many times until the required degree of grinding is reached and the drum 16 is completely empty of particles of the crushed material.

The installed upper 22 and lower 27 capsules will prevent the ingress and deposition of abrasive dust-like particles on the surfaces of bevel gears 6, 7, as well as bevel gears 8 and 9 of dust-like abrasive particles formed during the grinding process, which will reduce their wear and premature release. building. This will increase their durability and their service life during operation.

The technical result of the developed design of the device will be to increase the efficiency and operational performance by increasing the service life of the gears and bevel gears used in the mill for torque transmission.

Claims (1)

A mill containing a frame, a drum with outlet holes made in its lower part, a rotor bowl with radial ribs, a support shaft, a shaft jacket, an electric motor with two output shaft ends, a protective jacket, stuffing box covers, bearing assemblies and bearing supports, a safety clutch placed between the rotor bowl and the lower end of the motor shaft, kinematic transmissions made with a kinematic mismatch, characterized in that capsules are attached to the frame and the base fixed to the frame, inside which, at the ends of the motor shaft, bevel gears are mounted that are engaged with bevel gears wheels mounted on the hub of the rotor bowl and on the drum.

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