1) Suitable for materials with significant differences in specific gravity and large powder particles;

Double helix powder mixer(2 photos)

2) Suitable for mild mixing process of ceramic glaze materials, without pressure feeding or crushing of material particles;

3) Will not cause overheating of thermosensitive materials;

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

5) The bottom displacement valve is convenient for discharging, and since there is no fixed device at the bottom of the spiral, there will be no pressure feeding phenomenon.[1]

The double helix cone mixer belongs to the container fixed mixer. The machine is mainly composed of a transmission system, two inclined screws, a rotating arm, a cylinder, a discharge valve, etc. Two working screws are parallel to the generatrix of the conical cylinder, symmetrically distributed on both sides of the centerline of the cone, and intersect at the bottom of the cone, connected to the central rod. The upper parts of the two screws are connected to the transverse arms extending from the center to both sides, forming a mechanically symmetrical and balanced inverted triangular structure, including:

(1) Transmission system: It has the self rotation motion of a spiral shaft and the revolving motion along the cylinder wall with the rotating arm. The revolution and rotation are transmitted separately, and both parts use fixed cycloidal pinwheel reducers with high speed ratio and efficiency. They are distributed and reversed through bevel gears and transmitted to the two rotating arms.

(2) Cylinder: The container of this machine is made into an inverted cone shape, with the purpose of ensuring sufficient material alternating circulation under the lifting effect of the screw. Therefore, the container must have an appropriate cone angle. By analyzing foreign data and combining our design experience, usage status, and calculations of the "single helix cone mixer", we have determined the basic size series, full volume, cone angle, and container height parameters of the "double helix cone mixer" container.

(3) Rotating arm, central rod, and screw: The screw is composed of a screw and a spiral blade, and it is the direct working mechanism for mixing materials. In order to ensure the rigidity of the screw, reduce weight, and facilitate the welding of the spiral plate, a. 20 steel pipe is used for the screw in the design. Spiral blades are welded in a right-handed direction with a certain diameter and pitch. The upper end of the screw is connected to the cross arm, and the lower end is connected to the central pull rod, symmetrically on both sides. The connection form of this triangular symmetrical load-bearing component balances the force and improves the load-bearing state of the component. The lower end of the screw can be supported independently of the container by the central pull rod, without the need for a fixed bottom support structure at the bottom of the equipment.

(4) Discharge valve: The bottom bearing of the equipment has been removed, which is beneficial for discharging materials. This machine is designed with a discharge valve consisting of two overlapping fan orifice plates. The valve has a simple structure, does not take up space, and the size of the discharge hole can be freely controlled. It is easy to operate, and the material can be completely discharged. It can also be easily disassembled and cleaned, which is beneficial for cleaning and repairing equipment.

In summary, the double helix cone mixer has the advantages of not damaging particles, not overheating or deteriorating, and not separating or layering. It can be widely used for powder mixing in fields such as medicine, dyes, pesticides, chemical engineering, petroleum, metallurgy, glass, gelatin, etc. At present, this series of products has been produced by designated factories, which can meet the needs of relevant industries.[1]

The DSH series conical mixer cylinder has two asymmetric spirals that rotate upwards to lift the material, and the rotating arm moves slowly around the revolution; The material outside the spiral enters the screw column to varying degrees, achieving continuous updating and diffusion of the material in all circumferential directions. The two streams of material lifted to the upper part then converge towards the central cavity, forming a downward material flow that fills the gap at the bottom, thus creating a triple mixing effect of convective circulation; The standard conical spiral mixer has two stirring spirals. In practical applications, single (one long spiral), double (one asymmetric spiral for each length), and three (two short and one long symmetrically arranged) spirals can be used according to the equipment specifications; In theory, the more stirring spirals there are, the better the mixing effect; The equipment generally adopts a plum blossom shaped "displacement valve", which is tightly attached to the bottom of the long spiral, effectively reducing mixing dead corners. The driving form is available in manual and pneumatic modes; According to user needs, butterfly valves, ball valves, star shaped unloaders, edge discharges, etc. can also be installed.[2]

Used for mixing powdered and granular materials in industries such as pharmaceuticals, chemicals, food, and building materials.[2]

Compared with a single screw mixer, it has the following advantages:

1) Short mixing time, high efficiency, can increase efficiency by 2-3 times.

2) The mixing capacity is large, and the loading coefficient is 20-30% higher than that of the drum type and 25-40% higher than that of the V-type mixer.

3) High mixing accuracy, low energy consumption, can reduce by about half (referring to the unit weight of materials).

4) The height of the mixer housing is low.

5) The bottom discharge is fast, the discharge is clean and tidy, and the bottom can be tightly closed to prevent material leakage.

6) The dead corners of material mixing can be minimized.

7) The equipment is easy to clean and facilitates the replacement of mixed material varieties.

8) Avoid repairing the bottom bearings of the equipment.

9) Beneficial for the development of equipment towards larger scale.