SU1512655A1 - Tumbling barrel - Google Patents

Abstract

The invention relates to a technique for grinding and drying materials in drum mills with rollers. The purpose of the invention is to increase the specific grinding capacity, increase the productivity of drying wet, high-moisture and plastic materials. Wet material is fed into a cylindrical body 1, in which two pairs of rollers are installed on respective axes parallel to the axis of the housing, in each of which the first roller 7 has a cylindrical surface and the second roller 9 has a curved profile with a radius equal to the radius of the roller and directional from the center of the rink. The housing 1 rotates at supercritical speed and has a slope towards the discharge end. In the upper part of the housing 1, knives 24 parallel to the generators of the housing and trays 25 are installed. same roll. A hog 17 is fed with high temperature gas into the housing. Crossing the cavity of the body, the material is dried with this gas and thrown out when it reaches the specified size. At the outlet of the body, the material gets on the splitter of the flue 18, is picked up by low-temperature gas and is carried to the separator 19. 2 Cp. Of the file, 5 sludge.

Description

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Well, the discharge end. In the upper part of the housing 1, steps and knives 24 parallel to the generators of the housing and trays 25 are installed. falls under

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same roll. A hog 17 is fed with high temperature gas into the housing. Cross the body cavity, mate. The heal is dried with this gas and is cast out when it reaches 4 times of a given size. At the outlet of the housing, the material gets on the splitter of the duct 18, is picked up by low-temperature gas and is carried to the separator 19. 2 Cp. f-ly, 5 ill.

The invention relates to a technique of grinding method with one-time drying and can be used in the industrial construction, chemical, energy and mining and processing industry.

The purpose of the invention is to increase the grinding capacity and, ensure the drying of the material being crushed, improve the drying capacity, as well as the reduction of grinding and high-performance drying of high-moisture and plastic materials.

Figure 1 shows a drum mill, longitudinal section; figure 2 is the same, side view; on fig.Z - section aa in figure 2; on 35 figa. A diagram of the installation of the knives of the cutting heads, a transverse section; figure 5 is the same, top view.

The drum mill includes a cylindrical body 1 with a 40-ring gear 2, supported through rollers 3 on roller supports 4. Inside the body 1 there are grinding tracks with an even 5 and curvilinear 6 (in cross section) working surfaces. Grinding rollers 7 and 8 with an outer cylindrical working surface and grinding rollers 9 and 10 with a curved profile Q, described from the center of the roller with a radius equal to the radius of the roller, are installed above the tracks with a calculated clearance. Rollers 7 and 8 are wider than rollers 9 and 10.

The rollers 7 and 9, as well as 8 and 10, are mounted in pairs on axles 11 and 12. Hydraulic cylinders 14 are provided for clamping rollers 55 through levers 13 (connected to axles 11 and 12) and adjacent to the front of the drum

fixed loading device 15 including churning for charge 16 with a double sluice gate and gas supplying bore 17. A flue 18 with a divider, under which a separator 19 is installed with the finished product flue 20, is connected to the discharge end of the housing 1 through the seal. The separator also communicates with the mill cavity. 21 for grains.

The housing 1 itself, its driving and supporting parts, the roll pressing system are located on a common frame 22 which is located at an adjustable angle I, to the horizontal. Rods 23 are supported on the pillars of the same frame, on which the throwing knives 24 and trays 25, inclined in the direction of rotation of the roller, are fastened inside the drum. placed over the rolling part of the rinks. The position of the drum on the roller supports is fixed by the stop roller 26.

The working surfaces of the milling tracks and rollers are equidistant and have a wear-resistant lining.

Knives for cutting material set in steps with step t

D BYTELNO no more - n in number no less than -g, where D is the diameter

ice rink; Bj, is the width of the roller; B - the width of the knife is smaller or equal to the gap between the roller and the grinding track. The knives are parallel to the edging drum of the mill.

When grinding high-moisture and plastic materials, a rotating cutting head with an independent drive is placed above the first rollers instead of knives.

The knives are placed above the rollers so that the material falls on the pulling.

the material of half of the rollers and on the trays and the trajectories of its fall were of maximum length and occupied the greatest possible part of the cross-sectional area of the drum. The trays are tilted at an angle greater than the friction angle of the material.

Drum mill works as follows.

The drum 1 is rotated from the electromechanical drive through the gear rim 2 on the roller supports 4. The wet mixture is fed into the mill through the loading furnace 16 through a two-way valve, preventing cold air from flowing to the high temperature gas (about 500 ° C), which is fed to the mill 17 from

special firebox. The wet mixture at the entrance to the housing 1 falls under the cylindrical roller 7, which is installed above the grinding track 5 with a gap corresponding to the initial grinding stage in this mill. Due to the supercritical rotational speed of the drum, the material after the roller 7 rises to the top of the track, from where the knives 24 drop the train vertically downwards. The knives are installed not only over the surface of the rollers pulling in the material, but also over the rolling surface of the rollers, which became possible due to the inclined trays 25. Placing the knives in the indicated one, with a recommended pitch, ensures the material is discharged in a thin, even layer. It makes more efficient use of the cross-sectional area of the corpus, which significantly improves the conditions for drying the material.

Crossing the cavity of housing 1, the material is dried with a stream of high-temperature gas, the speed of which should not exceed the required (up to 1.5 m / s) for sweeping the finished product out of the falling material. At the same time, it is possible to involve an insignificant part of grain in this stream.

Repeated lifting and lowering of grinding particles is caused by the presence of supercritical peripheral speed, forced material separation by knives from the top of the grinding track, and a slope of the housing 1. All this gives the material to be grinded a sawtooth trajectory (when viewed from the side), and the advance step

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material (in this trajectory) is proportional to the slope of the body to the horizontal. Thus, the painted part may fall under the first roller several times, but after several lifting and lowering cycles it necessarily falls on the second grinding track 5 and under the roller 8, between which there is a reduced gap for subsequent grinding, and another force is attached to roller 8 clamp corresponding to this grinding step in this setting.

Under rollers 9 and 10, the grinded EMI material falls similarly to the described movement pattern. Due to the curvilinear profile of these rolls (and, consequently, different peripheral velocities of points on this surface), simultaneously with crushing, the layers of material move and slide relative to each other, which leads to the intensive formation of particles of the required fineness.

After the passage of the drum, the material, in which there are also unsweetened grains (grit), falls on the diffuser of the gas flue 18, is picked up by low temperature gases (about 300 ° C), for example, coming from the furnace unit, and introduced into the separator 19. During the passage material through the flue duct, which has a calculated length, between the gas and the ohm material in a suspended state, there is an active heat exchange, with the result that the drying process ends.

In the separator 19, the material is separated into the finished product leaving through the duct 20 into the precipitation system, and into the grains, which return to the abrasive rink through the chute 21. When large pieces get under the first rollers, the axles are raised and skewed. Since the second rollers are installed on the same axles, this could lead to a change in the size of the gap under the second rollers. However, this does not happen because the radius of the profile of the second rollers is equal to the radius of the rollers,: described from the center of the roller. This provides a backlash-free (across the width of) not adjacent rollers to the grinding tracks, which significantly increases the fineness of the grinding. In the case of grinding high moisture and plastic materials

In order to eliminate the extrusion of the material from under the roller by reducing the specific pressure, the first wide rollers are used, and the cutting head 27 rotating above them.

The rationality of the proposed design and the grinding process consists in the strictly prescribed operations performed by each roller: crushing by first jO and rollers, crushing and abrading.

The rationality of the design of the supply of heat carrier fluids and the drying process consists in the presence of two streams of 15 heat transfer fluids: high-temperature (up to 500 s) passing at a low speed (up to 1.5 m / s) through the drum, and low-temperature one going through the flue behind the mill. 20

This makes it possible to create optimal conditions inside the casing — the temperature required only for the grinding process of the wet material, and the magnitude of the speed for the removal of the mainly finished product. In general, such a separation of the coolant greatly reduces aerodynamic resistance due to a decrease in recirculation, lower speeds, etc. thirty

The proposed design has the following advantages: increasing the fineness of grinding, maintaining a loose fit (across the width) of the second rollers to the grinding tracks, increasing the specific grinding and drying capacity, the possibility of grinding 1 layer and highly wet materials.

Claims (3)

1. A drum mill containing a cylindrical dz casing filled with internal annular grinding tracks, mounted with an inclination towards its discharge end, placed in the casing at least two pairs of rollers, each of which is installed on an axis parallel to the axis of the housing and connected to devices for pressing the rollers against the grinding tracks, and a drive different from. so that, in order to increase the specific productivity of grinding and at the same time ensure the drying of the grinding material, it is equipped with an established one. in the case above the rollers, a device for discharging the material to be comminuted, a system for supplying hot gases, removal and separation of the dust-gas mixture, each roller being installed on a corresponding grinding track, the second rollers of each pair have a curvilinear profile with radius curvature drawn from the center of the roller and equal to the radius of the roller, and the drive is selected based on the condition of providing supercritical velocity-rotation of the body. 2. Mill pop. 1, different. so that, in order to increase the productivity of drying, it is equipped with trays, some of which are installed above the corresponding cat., which is tilted in the direction of its rotation, and the resetting device is made in the form of knives parallel forming the body and located above all rollers stepwise . 3. Pop-mill 1, characterized in that, in order to provide grinding and high-performance drying of high-moisture and plastic materials, it is equipped with trays, each of which is installed above the corresponding roller, while the width of the first rollers of each pair is greater than the width of the rollers with the curvilinear profile and the dropping material being crushed by the device over the first rollers of each pair has a recess of the head, and above the second rollers of each pair there are knives parallel to the forming body and arranged in steps. 2lt 2L Rb / hL § 5Р H "about 5