RU2174049C2 - Tube mill - Google Patents

Abstract

FIELD: solid material grinding equipment. SUBSTANCE: mill has sectioned Z-shaped drum, charging and discharge devices, frame suspended through rubber-cord casings to bed. Side surface of each drum section is defined by equilateral trapezium, two similar nonequilateral trapezium, with lower bases of all trapezium being equal and smaller than upper bases, with upper bases of all four trapezium being also equal, so that squares are formed at section ends. Square of each successive section is turned relative to square of previous section through angle of 180 deg. Each connected section has square lower base sides equal to square upper base sides of previous section. Tube provides for intensified material processing. EFFECT: increased efficiency, simplified construction and improved quality of ground material. 7 dwg

Description

 The invention relates to techniques for grinding solid materials and may find application in the construction, chemical and metallurgical industries.

 A tube mill is known (USSR AS 1349780, class B 02 C 17/02, 1985), containing a sectional drum mounted on a bed and filled with grinding media.

 The disadvantages of the known mill are the insufficient intensity of grinding and limited technological capabilities due to insufficient intensity of mixing.

Closest to the proposed invention is a tube mill (a.s. 1733086, class B 02 C 17/02, 1992) containing a multi-section drum, the side surface of each section of which is made by alternately connected rectangles and parallelograms with the formation of square sections at the ends, with this square of each subsequent section is rotated with respect to the previous square at 90 ^o to form on the surface of the drum with constant zigzag lines along the length of the drum and the step size constant flow cross section of the drum .

 The disadvantages of the known device are insufficient processing intensity and limited technological capabilities due to insufficient mixing intensity, as well as the need to create a slope of the entire structure of the tube mill to move the material from loading to unloading.

 The technical solution to the problem is the expansion of technological capabilities due to the formation of zigzag lines on the drum surface with increasing not only the step of these lines from loading to unloading, but also the size of the passage area of the drum.

The objective is achieved in that in a tube mill containing for filling with grinding bodies a sectional drum of a zigzag shape, loading and unloading devices and a drive mounted on a frame suspended by rubber cord pneumocylinders to a bed, the side surface of each section of a multisection drum is made alternately connected by one equilateral trapezoid, two identical non-equilateral trapezoids of the second, smaller in height than the first, equilateral trapezoid, the lower bases of which are equal to each friend to each trapezoid and smaller than the upper bases, also equal to each other for all four trapezoids, with the formation of square sections at the ends, while the square of each subsequent section is rotated relative to the previous square by an angle of 180 ^o , and each attached section has sides of the lower square bases equal to the sides of the square of the upper base of the previous section.

 Such a structural design of the drum surface around the perimeter allows not only axial movement of the material in the drum with a horizontal axis of rotation of the drum, to simplify the drive and increase the operational life, but also to increase the grinding intensity due to increased miscibility due to the presence of zigzag lines on the drum surface with with a variable step along the drum length, increasing as the passage section increases from loading to unloading, which violates the stationary motion thread grinding bodies and grinding materials and increases productivity.

 The elements from which the drum sections are assembled are different in area, size and configuration, therefore the mixing intensity increases, since these elements, working as shelves, capture portions of grinding media and material different in volume and direct them towards each other, violating such way the stationary motion of mass flows in the drum.

 The step of the zigzag lines increases from loading to unloading, which not only provides axial movement of the grinding media and material from loading to unloading, but also intensifies the spatial zigzag motion of the load and increasing the unbalance.

 The area and the cross-sectional shape of the drum along the length increases from loading to unloading, which intensifies the mixing process, since it violates the stationary motion of the flows of grinding media and materials, changing the amplitude of oscillations as the masses of the load move from loading to unloading.

 In FIG. 1 shows a drum mill, a general view; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 - section BB in FIG. 1; in FIG. 4 - one of the sections of the drum, axonometric projection; in FIG. 5 - the first equilateral trapezoid; in FIG. 6 - one of two identical non-equilateral trapezoid; in FIG. 7 - second equilateral trapezoid.

 The tube mill contains a frame 1, on which the drive 2 is mounted, an unloading device 3, end cheeks 4 and 5, between which a zigzag-shaped drum from sections 6 is rigidly fixed, a loading device 7, which is made in the form of a rigidly fixed shell 8 equipped with a cone 9 , screw winding 10 with a length of 0.75 turns.

 The drum is mounted rigidly between the cheeks 4 and 5 and is equipped with a support ring 11 that rests on the support rollers 12 and 13. The cheek 4 is connected rigidly by four rods 14 to the drive shaft 15 of the drive 2. The cheek 4 and the drive 15 are mounted at a distance of 0, 45 diameter cheeks for output of crushed material. The support rollers 12 and 13 are mounted on the frame 1. The rods 14 are located from the axis of rotation at a distance equal to 0.45 of the diameter of the cheek 4. The support rollers 12 and 13 are mounted on the frame 1. The frame 1 is suspended on three rubber-cord pneumocylinders 16, 17, 18. Two air cylinders 16 and 17 are mounted under the loading device 7, and the third air cylinder 18 is mounted under the unloading device 3 and along the axis of symmetry of the frame 1. The air cylinders 16, 17, 18 are mounted on the bed 19. On the frame 19 under the unloading device 3, a receiving tray 20 is fixed.

 Sections 6 (Fig. 5) are mounted from equilateral trapezoid (Fig. 5), two identical non-equilateral trapezoid (Fig. 6) and one equilateral trapezoid (Fig. 7), the lower bases of which are equal to each other at each of the trapezes and are smaller than the upper bases , also equal to each other in all four trapezoids. Moreover, along the length of the drum, each attached section has sides of the lower bases "a" equal to the sides "b" of the upper bases of the previous section. The sides “b” of the upper bases of section 6 are larger than the sides of the smaller bases “a”.

Sections 6 are connected to the drum by remaining equal equal to each other free sides and forming a square after each section is rotated 180 ^o relative to the previous section.

 In this way, a zigzag drum is created in which the axis of each section is alternately at an angle to the conveyance line, i.e. to the axis of rotation with increasing bore of the drum from loading to unloading.

 The drum is filled about 1/4 of the volume with grinding bodies 22 (balls) and is separated from the unloading device 3 by a diaphragm 21, made in the form of a perforated conical surface, the openings of which are smaller than the diameter of the grinding bodies.

 Drum mill operates as follows.

 The material enters the loading device 7, in which, by means of winding 10, it is fed to the inlet of the drum, which has the shape of a quadrangle asymmetrically relative to the axis of rotation and has two faces at the entrance to the drum whose inclination is opposite to the direction of movement of the material. Therefore, in the absence of screw winding 10 in the loading device, a return by these anti-inclined sides of the material is observed for each revolution. The presence of winding 10 prevents this return of material flows and ensures uninterrupted supply of material to the drum. Since only two of the four are opposite to the direction of movement of the material from loading to unloading, the length of the screw winding should be at least 0.5 step turns.

 During the rotation of the drum, the mixture of grinding media and materials makes a complex spatial zigzag motion with superposition of oscillations in three mutually perpendicular directions, excited due to the geometry of the drum during asymmetric motion of the loading masses and the occurrence of unbalance as a result of not only violation of the stationary motion of the load, the geometric shape of the section, their mutual location relative to each other and to the axis of rotation, but also to increase the amplitudes of the oscillations due to the increase from loading to unloading along not the drum of the passage section of the drum and the step of the zigzag lines of the drum.

 The increase in the bore along the length of the drum ensures the movement of the material from loading to unloading.

 The material, moving from the loading device 3 to the unloading 7, is discharged into the receiving tray 20.

 Since the cross-sectional dimensions, shape and location, the center of symmetry vary along the length of the drum, the disturbance in the movement of the loading masses is aggravated, i.e. there is an increase in processing intensity.

Claims (1)

 A tube mill containing, for filling with grinding media, a zigzag sectional drum, loading and unloading devices and a drive mounted on a frame suspended by rubber-cord pneumocylinders to a bed, characterized in that the side surface of each drum section is made by alternately connected by one equilateral trapezoid, two equally unequal trapeziums, the lower bases of which are equal to each other at each of the trapeziums and less than the upper bases, which are also equal among themselves at all four trapeziums, with the formation of square sections at the ends, while the square of each subsequent section is rotated 180 ° relative to the square of the previous section, with each attached section having the sides of the lower base square equal to the sides of the square of the upper base of the previous section.

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