double screw mixer

This type of chemical machinery has a wide adaptability to mixed materials, does not overheat heat-sensitive materials, does not pressure feed and grind granular materials, and mix materials with large contrast weights and different particle sizes will not cause chip separation.

The Chinese name of the double helix cone mixer is the special chemical machinery, and it has wide applicability. It is widely used in medicine, chemical industry, food, building materials and other industries.

Applicable characteristics

1) Suitable for materials with large disparity in material specific gravity and fairly large powder particles;

2) It is suitable for the gentle mixing process of ceramic glaze, and the material particles will not be crushed or crushed;

3) It will not overheat the heat-sensitive materials;

4) During the powder-powder mixing process, it is very convenient to add liquid required by working conditions or set up one or more spray nozzle devices;

5) Displacement valve at the bottom is convenient for discharging. Since there is no fixed device at the bottom of the screw, there will be no pressure feed.

Structure introduction

The double-screw cone mixer is a fixed-container mixer. The machine is mainly composed of a transmission system, two inclined screws, a rotating arm, a cylinder, and a discharge valve. The two working screws are parallel to the generatrix of the conical cylinder, symmetrically distributed on both sides of the center line of the cone, and converge at the bottom of the cone, and are connected with the central tie rod. The upper parts of the two screws are respectively connected with the cross arms extending from the center to the two sides to form a mechanically symmetrical and balanced inverted triangle structure, including:

(1) Transmission system: the rotation movement of the screw shaft and the revolving movement of the rotating arm along the cylinder wall. The revolution and rotation adopt a separate transmission method. Both parts adopt a cycloidal pinwheel reducer with a large speed ratio and high efficiency, which is transmitted to the two rotating arms through bevel gear distribution and reversal.

(2) Cylinder: The container of this machine is made into an inverted cone shape, and its purpose is to satisfy that the material has enough material to circulate alternately under the action of the screw lifting, so the container must have an appropriate cone angle. Through the analysis of foreign data, combined with the design experience, use status and calculations of the "single spiral cone mixer" of our hospital, the basic size series, full volume, cone angle and container size of the "double spiral cone mixer" have been determined. Parameters such as height.

(3) Rotating arm, center rod and screw: The screw is composed of screw and screw, which is the direct working part of the mixed material. In order to ensure the rigidity of the screw, reduce the weight, and facilitate the welding of the spirals, the screw uses .20 steel pipe in the design. The spiral blades are welded in a right-handed direction with a certain diameter and pitch. The upper end of the screw is connected with the cross arm, and the lower end is connected with the central pull rod, and the two sides are symmetrical. The connection form of the triangular symmetrical force-bearing member is balanced in force, which improves the force-bearing state of the member. The lower end of the screw can rely on the central pull rod to be independent of the container, and it is not necessary to provide a fixed bottom support structure at the bottom of the equipment.

(4) Discharge valve: The bottom bearing is removed from the bottom of the equipment, which is beneficial for discharging. This machine is designed with a discharge valve that is overlapped by two fan orifice plates. The valve has a simple structure, does not occupy space, the size of the discharge hole can be controlled at will, the operation is simple, the material can be completely discharged, and it can be easily removed and washed , So it is conducive to cleaning and repairing equipment.

In short, the double helix cone mixer has the advantages of no damage to particles, no heat deterioration, no segregation and layering, etc., and can be widely used in powder mixing in the fields of medicine, dyes, pesticides, chemicals, petroleum, metallurgy, glass, and gelatin. At present, this series of products are produced by designated factories, which can meet the needs of related industries.

working principle

The two asymmetric spirals in the DSH series conical mixer barrel automatically lift the material upwards, and the rotating arm revolves slowly; the material outside the spiral enters the stud to varying degrees, so as to achieve the continuous update and diffusion of the material in the entire circumference. The two materials lifted to the upper part merge into the central cavity to form a downward material flow, which supplements the vacancy at the bottom, thus forming a triple mixing effect of convection circulation; the standard conical spiral mixer has two mixing Spiral, in actual application, according to the size of the equipment, single (one long spiral), double (one or two asymmetric spirals for each length), three (two short and one long symmetrically arranged) spirals can be used; in theory, the more agitating spirals, The better the mixing effect; the equipment generally adopts the plum blossom-shaped "stagger valve", this valve fits closely to the bottom of the long spiral, effectively reducing the mixing dead angle, the driving mode is manual and pneumatic optional; according to user needs, butterfly valves and ball valves can also be installed , Star discharger, side discharge, etc.

Technical Parameter