RU2497594C1 - Horizontal roll mill - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to drum-roller mills and may be used in construction, power engineering, chemical and food industries etc. Proposed mill comprises hollow cylindrical housing 1 mounted at roller bearings 2, different-diameter rolls 7, 8 arranged there inside, device to press said rolls to said housing 1 and material stepwise feeder. Said feeder combines loading device, tripping device, redirecting device and unloading device and is composed of a box 11 with displacing guides 12 and scraper 14.

EFFECT: higher efficiency of mixing, simplified design.

2 cl, 2 dwg

Description

The invention relates to techniques for grinding material in drum-roller mills and can be used in the construction materials industry, energy, chemical, food and other industries.

A device for grinding material [A.S. USSR No. 919731, IPC V02C 15/16, 1982], selected as a prototype. The device comprises a hollow cylindrical body mounted on roller bearings, an eccentrically located roll, a cleaning scraper, loading and unloading units, the loading unit is equipped with a switchgear located in the casing above the roll and made in the form of guides mounted on axles with the possibility of adjusting the clearance between them, each pair of which forms a section.

The disadvantage of this device is the low efficiency and complexity of the settings.

The closest technical solution to the achieved result is a device for grinding material [patent of the Russian Federation No. 2040968, IPC V02C 17/10; B02C 15/06; B02C 15/16, 1995], selected as a prototype. The device comprises a cylindrical body made with an internal annular grinding track, a roll placed inside the housing, mounted on an axis parallel to the axis of the housing and connected to a device for pressing the roll against the grinding track, a dumping knife, a flat tray mounted above the roller with an inclination to a plane passing through axis of rotation of the roll and housing. The device for clamping the roll contains hydraulic cylinders acting on the ends of the roll with a force that presses the latter against the cylindrical body. The tray in the device is divided into three independent planes, each of which is rotatable around a vertical axis. Material separated from the grinding track falls on the plane and slides along them toward a greater inclination. The method includes feeding the crushed material to a rotating annular grinding track so that the material passes several times between the track and the roll before leaving the track, rotating the material at a supercritical speed, loosening the material in the gap between the passes between the roller and the track, crushing and abrasion of the material by applying effort to roll. In this case, with each passage, stepwise movement of the material is carried out towards the discharge end of the housing, and the impact on the material layer is carried out at a pressure of 10 ... 40 MPa.

The disadvantage of this device is the complexity of the design and the difficulty of setting up a system consisting of a dumping knife and a flat tray. However, the presence of independent planes in a flat tray, each of which is rotatable around a vertical axis, leads to the supply of material to the grinding track in the form of jets with different thicknesses. Moreover, part of the roll will not participate in the grinding process of the material, which leads to low efficiency of the grinding process. The implementation of the device for the clamp in the form of a single system acting simultaneously on both ends of the roll, cannot exclude the parallelism of the roll and the grinding track, which leads to low efficiency of the process of grinding material.

The aim of the invention is to simplify the design of the mill and increase the efficiency of the grinding process.

This goal is achieved by the fact that in a mill containing a hollow cylindrical body mounted on roller bearings, a roller support drive for rotating the housing at supercritical speed, two rolls mounted inside the housing for rotation on its inner surface, a device for pressing the rolls against the housing and a device for step-by-step feeding of the material during its transverse movement along the body, combining loading, dumping, redirecting and unloading devices, made in the form of a box with laid inside the guides that move the material and the scraper, the rolls are made with different diameters, the first roll, in the direction of the material, has a larger diameter, pre-crushes large pieces of material, the second roll performs final grinding, the rolls are installed on the device for pressing the rolls, which includes fixed emphasis mounted on the frame and movable spring-loaded suspension. The roll clamp also acts as a safety device.

To illustrate the implementation of the device shown graphic materials.

Figure 1 presents the machine a General view and side view;

figure 2 section aa - design deflecting device.

The horizontal roll mill consists of a hollow cylindrical body 1 rotating at a speed higher than critical, mounted on rollers 2 mounted on the frame 3. The housing is driven by an electric motor 4 through a belt drive 5 and a drive roll 6. Inside the housing, work rolls 7 and 8 are suspended on the axes 9 and 10, while the roll 7 has a larger diameter, a deflecting device, consisting of a deflecting surface 11 with guides 12, a cover 13 and a scraper 14. The deflecting device is mounted on the axis 15 and is pressed against the housing 1 by means of springs 16. The rollers are mounted on the device for pressing the rolls, it includes a fixed stop 17 mounted on the frame 3 and a movable spring-loaded suspension 18. The clearances between the rollers and the housing are regulated by bolts 19. The force of pressing the rolls to the housing is the grinding force, adjustable by bolts 20. The device for pressing the rolls also performs the function of a protective device, in case of ingestible material, the rolls are lifted and pass the unfinished material without damaging the machine.

The machine operates as follows. When the cylindrical body 1 is gaining operating speed, material is fed into the deflector through the hopper 21 in a continuous stream. On the cover 13, the material rolls to the first roll 7, is evenly distributed along the working gap, is preliminarily crushed, then the material enters under the second roll and is finally crushed. The material tape, pressed by centrifugal forces to the surface of the cylindrical body, falls into the deflecting device, moves and then falls under the action of the first roll, the cycle is repeated six times. The material in the mill moves in a spiral. The last guide acts as an unloading device, takes the tape of material outside the grinding zone of the mill. The required thickness of the crushed material is obtained by approximating or removing the suspension 18 with bolts 19, which allows to reduce or increase the gap between the housing and the rolls.

The supply of material under the rolls after each passage between the roll and the casing, in the form of a tape of the same mass width, eliminates the variable thickness of the crushed layer, that is, eliminates voids in the layer, which creates favorable conditions for intensive grinding of the material and, as a result, causes an increase in the efficiency of the grinding process. Moreover, the design of the deflecting device and the device for pressing the rolls are simple in execution.

Thus, the objective of the invention is achieved.

Claims (2)

1. A horizontal roll mill comprising a hollow cylindrical body mounted on roller bearings, a roller support drive for rotating the housing at supercritical speed, two rolls mounted inside the housing for rotation on its inner surface, a device for pressing the rolls against the housing and a stepper device supply of material during transverse movement of the housing, characterized in that the device for the step-by-step feeding of material combines loading, dumping, redirecting and unloading full-time device, made in the form of a box with internal guides that move the material, and a scraper, rolls are made with different diameters, the first roll in the direction of movement of the material has a larger diameter, pre-crushes large pieces of material, the second roll produces final grinding, the rolls are installed on the device for clamping the rolls, which includes a fixed stop fixed to the frame, and a movable spring-loaded suspension. 2. The horizontal roller mill according to claim 1, characterized in that the device for pressing the rolls also works as a protective device.

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