An interchangeable drying compartment device for air-swept coal mill

Abstract

The invention relates to the field of ball mills with drying bins, in particular to an interchangeable drying bin-separating device for an air-swept coal mill. The interchangeable drying bin-separating device comprises a combined supporting frame, a conical discharging body, a plurality of lifting plates and bin-separating grid plates; the combined supporting frame comprises an annular fixing frame with the U-shaped section, the periphery of the fixing frame is fixed to a mill cylinder, and a supporting plate with a central hole and a baffle are connected to the two sides of the fixing frame respectively through bolts; the bin-separating grid plates are connected to the side, facing a grinding bin, of the fixing frame through bolts; the conical discharging body is arranged in the central hole of the combined supporting frame and is connected and fixed to the supporting plate, and a plurality of butt plates used for fixing the lifting plates are arranged in the peripheral direction of the conical discharging body; each lifting plate is composed of one arc-shaped curved plate and two side plates, is embedded between the baffle and the supporting plate and is connected to the supporting plate through one side plate and a bolt. According to the interchangeable drying bin-separating device, the interchangeability of the bin-separating device can be improved, the material accumulation problem of a drying bin can be solved, the mill efficiency can be improved, assembly is easy, and the potential safety hazard of bolt breakage is avoided.

Description

technical field [0001] The invention relates to the field of ball mills with drying chambers, in particular to a drying chamber device applied to air-swept coal mills. Background technique [0002] During the grinding process, the water content of the material is usually high, even as high as 10% to 14%. High water content will lead to low grinding efficiency, which is not conducive to the grinding of materials and reduces output. Therefore, when the material has a high water content and needs to be dried, a drying chamber, a drying compartment and a grinding chamber are often installed in the mill barrel, and hot air is passed through it. After the material is fully heat-exchanged in the drying chamber and dried, it is sent to the grinding chamber for grinding through the drying compartment device. [0003] At present, the drying compartment device is composed of a support frame, a grate plate, a central cone, and a lifting plate. The outer ring of the support plate is fi...

AI Technical Summary

Problems solved by technology

[0004] In the manufacturing process of the mill, due to the limitation of the structure, the lifting plate is usually welded on the support frame before the front plate or the rear plate of the support frame, and the whole flips 180° after welding the front plate or the rear plate, and the lifting plate It is firmly welded with the support frame, so that the deformation is often large during the lifting and welding process, and the cylindricity and flatness are difficult to guarantee. In the actual installation process inside the cylinder, due to the large local deformation, it is difficult to assemble, and it usually needs to be repaired repeatedly, which is time-consuming and laborious.

When the grate plate is installed, due to the large deformation of the plane of the support frame, the plane of the grate plate does not fit the plane of the support plate. During the subsequent operation of the mill, the mounting bolts are subjected to excessive shear force, which is likely to cause a safety hazard of fracture due to stress concentration

On the other hand, once the rotation direction of the mill is reversed, the direction of the surface of the lifting plate needs to be redesigned, assembled and welded in the support plate, which increases the production cost

In addition, during the operation of the mill, the lifting plate wears faster than the support frame, and the scrap rate is relatively high. Due to the overall welding structure, it is easy to increase the production cost and affect the production efficiency

Due to the change of the amount of material fed to the mill, the position and quantity of the lifting plate are fixed and cannot be adjusted flexibly according to the actual situation (changes in the amount of material), which will cause poor material flow and easy formation of accumulated material. It is difficult to clean and maintain after the material is agglomerated, which brings inconvenience to the user and directly affects the drying efficiency

Based on the structure of the existing drying compartment device, the above-mentioned problems in its manufacture, installation and use all directly affect the efficiency of the mill

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