RU2235597C2 - Planetary mill - Google Patents

Abstract

FIELD: grinding equipment.

SUBSTANCE: planetary mill has casing, carrier made in the form of faceplate mounted on vertical shaft inside casing and connected through V-belt transmission with drive, grinding drums with detachable covers, disk-shaped holders of grinding drums equipped with clamping devices and arranged on carrier peripheral parts, bearing units for holders composed of bearings mounted on shaft inside ring, and satellite pulleys connected through V-belts with central immovable multiple-run pulley. Bearing unit shafts are immovably fixed in carrier in cantilevered manner. Satellite pulleys are mounted on rings, where bearings are mounted. Milling drum clamping devices are made in the form of sleeves with threaded inner surface of their throats adapted to be screwed on threaded side surfaces of drum holders until sleeve bottoms abut against drum covers. Central multiple-run pulley may be made dismountable.

EFFECT: enhanced reliability in operation and prolonged service life of planetary mill.

2 cl, 2 dwg

Description

The invention relates to grinding equipment, in particular to planetary mills, and can be used in powder metallurgy, food, perfumery, non-ferrous, paint and varnish, construction and mining industries to produce fine powders.

A planetary mill of periodic action is known (see the description for the USSR author's certificate No. 1748864 according to class B 02 С 17/08, published on July 23, 1992).

The mill contains a hollow column mounted on the bed with a gear wheel mounted on it, a drive carrier with pinion gears, grinding drums with removable covers, grinding drum holders and a clamping mechanism for grinding drums in the form of a clamping disk with guides. The carrier is made in the form of lower and upper faceplates connected by couplers. On the faceplate, spring-loaded locks are pivotally fixed. Between the clamping disk and the upper faceplate is placed squeezing disk.

After installing the grinding drums on their holders, the pressure disk is lowered. At the same time, the drums are closed with lids, and the locks-latches are closed. Thus, all grinding drums are simultaneously closed and clamped at the working position, the drive motor is turned on and the grinding process begins.

The mill has high productivity.

However, it has a very complex and expensive construction.

The planetary mill, which is the closest analogue of the claimed invention, is simpler in design (see German patent No. 1200105 according to the German class. 50s-15/25, issued March 24, 2006). The mill contains a housing with a central fixed multi-grooved pulley, in which a shaft is mounted in the bearings, a carrier in the form of a face plate is fixed at one end of the carrier, and a drive pulley connected to a V-belt drive with a drive motor is mounted on the other end. On the periphery of the carrier, grinding drums with removable covers are placed on disk-shaped drum holders with means for clamping them. Each clamping tool is made in the form of a screw resting on the center of the lid and passing through a horizontal bar, the ends of which are connected by flexible rods to the drum holder. The holders are fixed at the upper ends of the vertical shafts on which the inner bearings of their bearing assemblies are mounted. The bearings, in turn, are installed inside the cages fixed in the face plate of the carrier under the holders of the drums. At the ends of the shafts, opposite to the holders, satellite pulleys are connected, connected by V-belts with a central fixed multi-belt pulley.

The grinding material and grinding media are loaded into grinding drums and covered with lids. To clamp grinding drums, they are mounted on holders. The screws of the clamping means rest on the centers of the lids and, rotating the screws, tension the flexible rods connecting the ends of the horizontal bars with the holders of the drums. After clamping the grinding drums, the drive is turned on, which rotates the shaft with the carrier fixed to it. Grinding drums located on the periphery of the carrier rotate with the carrier. Simultaneously with the start of rotation of the carrier, V-belt belts are driven into rotation by satellite pulleys on the vertical shafts of the holders of the grinding drums. The shafts, rotating in the inner race of the bearings of their bearing assemblies, rotate the holders together with grinding drums fixed to them. In this case, the outer race of the bearings of the bearing assemblies of the holders remain stationary relative to the carrier. Due to this movement, grinding material is crushed in grinding drums.

This mill has a simple design.

However, during rotation of the inner race of bearings in the field of centrifugal forces created by the rotating carrier, the bearings of the rolling elements of the bearings break away from the outer race and jump with impact on the inner race. This creates large shock loads on the internal bearings and cages, reducing their durability and performance. The means for clamping the grinding drums in the mill have large vertical dimensions, are complex in design and not reliable enough when the rotation speeds of the grinding drums increase. In addition, in this mill, due to the inevitable difference in the length and size of the cross section of the V-belts, the transmission of rotation from the central multi-belt pulley to the satellite pulleys can occur with slippage.

The basis of the present invention was the task of developing the design of a planetary mill in which the bearing assemblies of the holders of grinding drums and means of their clamping would be made in such a way that the transmission of torque eliminates the occurrence of shock loads on the bearing cages and cages, thereby increasing their reliability and durability, and means for clamping grinding drums would have reduced dimensions, increased strength and reliability.

The problem is solved in that in a planetary mill containing a housing in which a carrier is mounted in the form of a face plate connected to a V-belt drive with a drive, grinding drums with removable covers, disk-shaped holders of grinding drums with means for clamping them, located on the periphery of the carrier, bearing assemblies of holders, consisting of bearings mounted on a shaft inside the cage, and satellite pulleys connected by V-belts with a central fixed multi-belt pulley, is a new It is understood that the shafts of the bearing assemblies are fixed in the carrier motionlessly and cantileverly, and the satellite pulleys are made on cages in which the bearings are mounted, while the means for clamping the grinding drums are made in the form of cups with thread on the inner surface of their necks screwed onto a thread made on the side surfaces of the drum holders until the bottom of the glasses stops in the drum caps.

Thanks to this solution, when the outer bearings are rotated in the field of centrifugal forces created by the rotating carrier, the rolling bodies do not break away from the outer rings, which completely eliminates the occurrence of shock loads on the bearings and cages, which ensures an increase in the durability and performance of the bearings. Moreover, this embodiment of the means for clamping the grinding drums provides a reduction in their vertical dimension, simplification of their design, as well as an increase in their strength and reliability with increasing speed of rotation of the drums.

Also new is the fact that the central multi-grooved pulley is made collapsible and consists of washers that form the profile of the groove grooves, and intermediate spacer rings.

Thanks to this solution, it is possible to change the width of the grooved grooves of the pulley, which, in turn, provides the opportunity to obtain the optimum tension of the belts to transmit torque without slipping and without the use of an additional tension device.

Below the essence of the present invention is explained in more detail by detailed examples of its implementation with reference to the accompanying drawings, in which:

figure 1 schematically shows the inventive planetary mill in cross section, side view;

figure 2 schematically shows the Central multi-belt pulley V-belt transmission in cross section, side view.

The planetary mill contains a housing 1 (Fig. 1), in which a fixed vertical shaft 2 is installed. A carrier 4 is mounted on the shaft 2 on bearings 3, made in the form of a faceplate, on the side surface of which a groove 5 for a V-belt connected to a drive motor is made (not shown). Above the carrier 4, the central multi-grooved pulley 6. The grinding drums 7 with removable covers 8. are fixed on the periphery of the carrier. The embodiment of the mill with two grinding drums is shown in the drawing, but it is obvious that the number of grinding drums can be large. Grinding drums 7 are placed on disk-shaped holders 9. Means of clamping grinding drums are made in the form of cups 10, in the bottoms of which the central supporting protrusions are fixed 11. On the inner surfaces of the necks 12 of the cups 10 a thread 13 is made, with which they are screwed onto a thread 13 made on the side surfaces holders 9 to the stop of the supporting protrusion 11 of the bottom in the cover 8. The threads 13 of the holders 9 and the glasses 10 have a direction that ensures the tightening of the threaded connection during rotation of the grinding drums 7.

On the lower surfaces of the disk-shaped holders 9, clips 14 are arranged integrally with the holders. Bearing assemblies 14 are located in cages 14, consisting of two ball bearings 15, the outer cages of which are pressed into cages 14. The inner cages of bearings 15 are pressed onto shafts 16, which are cantilevered and fixed on the periphery of carrier 4. In cages 14, grooves 17 are made for accommodating wedges belts 18 connecting the clips to the central multi-belt pulley 6. Thus, the clips 14 are satellite pulleys.

Central multi-belt pulley 6 (figure 2) is made collapsible. Each of its single-strand disks consists of washers 19, forming the profile of the groove 17 and intermediate spacer rings 20. Threaded holes are made in the lower washers 19, into which the connecting screws 21 are screwed. When installing the mill, changing the thickness of the intermediate spacer rings 20, change the width of the brook grooves 17. This makes it possible to obtain optimal tension of the V-belts 18 (FIG. 1) for transmitting torque without slipping, despite their inevitable slight differences in length and cross-section.

The inventive planetary mill operates as follows.

In grinding drums 7 load the crushed material and grinding media. The drums 7 are closed with lids 8 and installed on the holders 9. The glasses 10 are screwed by the thread 13 of the necks 12 onto the thread 13 of the side surfaces of the holders 9 until the support protrusion 11 of the bottom of the cups stops in the covers 8. This ensures that the grinding drums 7 are clamped.

The drive motor is turned on, as a result of which the carrier 4 comes into rotation, involving the grinding disks 7 into rotation around the fixed axis 2. At the same time, the central multi-belt pulley 6 remains stationary. As a result of this, the holders 14 of the holders 9, which are simultaneously pulleys-satellites, rotate by V-belts 18 around the stationary shafts 16, involving grinding drums 7 clamped by the glasses 10 in this rotation. Due to this movement, the loaded material is crushed in the drums 7. In this case, the inner race of the bearings 15 remains stationary on the shafts 16, and when the outer race of the race of separation of the rolling bodies from the race does not occur, which completely excludes shock loads on the race of bearings and cages. At all high-speed operating modes of the mill, the grinding drums remain securely clamped, and the transmission of rotation to the holders 9 occurs without slipping of the V-belts 18.

Of the specific examples of the implementation of the claimed invention for any specialist in this field, the possibility of their implementation with a simultaneous solution of the task is completely obvious. It is also obvious that during the implementation of the invention, minor changes can be made, which however will not go beyond their limits, as defined by the following claims.

The inventive planetary mill is very simple in design and manufacture. The mill has high reliability and durability due to the exclusion of shock loads in the bearing assemblies of the grinding drum holders. It has a reduced vertical dimensions.

Claims (2)

1. A planetary mill containing a housing in which a carrier was mounted in the form of a face plate connected to a V-belt drive with a drive, grinding drums with removable covers, disk-shaped holders of grinding drums with clamping means, located on the periphery of the carrier, bearing bearing assemblies, consisting of bearings mounted on a shaft inside the cage and satellite pulleys connected by V-belts with a central fixed multi-belt pulley, characterized in that the shafts of the bearing assemblies fixed in the carrier motionlessly and cantilever, and the pulleys-satellites are made on cages in which bearings are mounted, while the means for clamping the grinding drums are made in the form of cups with a thread on the inner surface of their necks screwed onto the thread made on the side surfaces of the drum holders to stop of the bottom of the glasses in the lids of the drums. 2. The planetary mill according to claim 1, characterized in that the central multi-grooved pulley is collapsible and consists of washers that form the profile of the groove grooves and intermediate spacer rings.

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