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The powder mixer is a mechanical device that uniformly mixes two or more kinds of powder materials or a small amount of liquid by mechanical force, gravity, or the like. During the mixing process, there are shear, convection, diffusion, infiltration, friction and other interactions, which can also increase the contact surface area of the material to promote chemical reactions; it can also accelerate physical changes. Common mixers are: double spiral conical mixer, coulter mixer, gravityless mixer, horizontal ribbon mixer.
Double spiral cone mixer
First, the main purpose: Conical mixer is a new type of high-efficiency, high-precision particle mixing equipment, it is widely used in chemical, pesticide, dye, medicine, food, feed, petroleum, metallurgical mining and other industries of various powder particles the mix of.
Second, the main features (1) advanced structure, easy to operate, safe and reliable operation.
(2) The mixing speed is fast and the quality is uniform. The double helix of the machine is asymmetrically arranged, and the large and small ones expand the mixing range, so it is more suitable for mixing materials with a large specific gravity ratio.
(3) The energy saving effect is remarkable, and the energy consumption of this machine is only one tenth compared with the drum type mixer.
(4) The wear and pressure feed of the granular material is small, and the superheat reaction of the heat sensitive material does not occur.
(5) The mixed preparation is stable, and no delamination or segregation occurs.
(6) The machine is dust-free, easy to operate, convenient to maintain, and long in service life. In addition, the cone can be made into a pressure vessel for pressurization or vacuum operation according to user requirements.
(7) The autobiography and revolution of the machine are completed by a set of motors and reducers.
Third, the working principle
(1) The particles move around the wall of the cone due to the revolution of the double helix.
(2) Due to the auto-transmission of the spiral blade, the powder is discharged toward the center of the cone for radial movement.
(3) The powder flows upward from the bottom of the cone and is discharged to the outer peripheral surface of the spiral to mix the materials.
(4) The downward flow of the powder particles caused by the spiral rotation is precisely due to the combination of the revolution and the rotation of the spiral in the mixer, forming four kinds of flow forms of the powder: convective, shearing, diffusion, and infiltration. . Therefore, the powder can quickly reach uniform mixing in the mixer.
The coulter mixer is widely used for drying and mixing dry powder mortar, chemicals, pesticides, detergents, pigment foods, monosodium glutamate, milk powder, salt, feed, chemicals, ceramics, plastics, rubber additives and other powders.
1 The concept of the core technology of the coulter mixing mechanism, coupled with the discrete mixing of the high-speed rotating cutter head, the mixing speed is fast, according to the different formulations of the product, the host mixing time is 90-180s.
2 The mixing precision of the mixing machine is high, the workability and uniformity of various materials are good, and no segregation occurs during mixing. The mixing ratio of stirring can be as high as 1:10000, which can meet the construction requirements to the greatest extent.
3 unique single door discharge device. There is no dead zone, no residue, no leakage during discharge, and the discharge time is short. For colored mortars, it is only necessary to simply clean or not clean the product formulation.
4 With dynamic manual sampling port, it is convenient for users to sample and test, and can adjust the mixing time of the main machine according to the inspection condition of the product to meet the production requirements.
5The mixing main cylinder and the mixing blade are made of imported alloy wear plate. The high-speed flying knife adopts wear-resistant alloy castings, which have high wear resistance and prolong the service life of the mixing machine.
The LDH-coulter mixer drives the coulter shaft movement by the drive wheel reducer. On the one hand, the material is pulsed radially along the circumference of the cylinder, and the material is thrown along the normal direction on both sides of the coulter. On the other hand, when the material is thrown through the flying knife group, it is sheared and stirred by the high-speed rotating knife and strongly dissipated. Under the combined action of the coulter and the flying knife, the material is continuously changed, diffused, and solidified. (Materials and powders), solid-slurry (powder and cement) materials or materials with large differences in density can also be mixed.
The gravity-free mixer can be roughly divided into two types: an ordinary gravity-free mixer, a fly-type gravity-free mixer, and the latter mainly for a type in which the material contains fibers and the fly knife is cut and then mixed. It is widely used for drying and mixing of dry powder mortar, chemical, pesticide, detergent, pigment food, monosodium glutamate, milk powder, salt, feed, chemicals, ceramics, plastics, rubber additives and other powders.
Working principle and structure
The gravity-free mixer makes full use of the convection mixing principle, that is, the flow layer is formed by the upper throwing motion of the material in the mixer, and the instantaneous weight loss is generated to achieve a better mixing effect state. The mixing process is shown in the figure. In the field of flow layers, the material overcomes the centrifugal force at a peripheral speed, moves from A to B under the action of a blade with a certain angle, while the moving blades in the machine send it to C, the blade with the same specific angle and then put it It is sent to D, and then returned to A by D; and, under the action of specific overlapping blades, the material is axially moved to achieve mixing in a omnidirectional range to form a random preferred motion state. The horizontal cylinder of the machine is equipped with a double-axis rotating reversed blade, and the blade is circulated at a predetermined angle to axially and radially circulate the material, so that the material is quickly mixed uniformly; to reduce the replacement cost of the wearing parts of the device, The blade blade can be made into two pieces, and a movable small blade is placed on the blade base to directly replace the worn small blade, which is economical and quick; the discharging form is generally a pneumatic (manual) flap valve, and the arc valve is tight It is embedded in the cylinder and flush with the inner wall of the cylinder. There is no material accumulation and mixed dead angle. The standard type has a large opening and small opening, and the large opening is open to the side of the tube. The discharging is clean and fast, and the residue is small.
The machine is equipped with a pair of shafts rotating in opposite directions in a w-shaped mixing chamber, and a blade having a predetermined angle, a predetermined number and overlapping is mounted on each shaft, and a fluid layer is formed in the mixing chamber having a peripheral speed. The materials in the layer are mixed under the action of the convection mixing principle, and are in a state of weightlessness in an instant, thereby obtaining a homogeneous mixture. A liquid ejecting port may also be provided above the container for solid-liquid mixing of the sprayed liquid. The machine's rotation speed is 50%-80% of the critical speed. When the blade distance is small, the critical speed can be approached. Performance characteristics The rotation speed of the shaft driven by the reducer and the structure of the blade will weaken the gravity of the material. With the lack of gravity, the difference in particle size and specific gravity of each material is neglected during the mixing process. Intense mixing movement shortens the mixing time and is faster. Even if the material has a difference in specific gravity and particle size, a good mixing effect can be achieved under the rapid and vigorous tumbling of the staggered stirring blades. The gravity-free mixer can achieve a spray operation of less than 17%, and materials with too much viscosity after adding liquid are not suitable. It can be mixed with solid (powder)-solid (powder) (powder size 300-2000um). According to the production requirements, it is also possible to install a spray and jacket device to make it a solid (powder)-liquid (mixing and drying equipment with a liquid content <15%. Mixing materials with large differences in specific gravity and particle size Production stratification and segregation phenomenon. When the solid-solid mixture is 1:1000, the standard deviation is between 30,000 and 100,000. The mixing speed is fast, and the general powder mixing takes only 2-3 minutes. It is 1/4~1/10 of the general mixer. The machine is operated intermittently, and the discharge valve adopts double-opening and discharging. It is provided with manual and pneumatic discharge. The material is carbon steel and stainless steel.
Scope of application
Gravity-free mixer is mainly used for anti-cracking mortar, thermal insulation mortar, bonding mortar, plastering mortar, floor mortar and other dry powder mortar and putty powder with high mixing uniformity. Concrete admixtures, feeds, chemical powders, food spices and other industries have also been widely used, and it is not suitable for the mixing of raw materials with a large amount of spray and a particularly large viscosity of materials. Gravity-free mixer is widely used for drying and mixing of dry powder mortar, chemical, pesticide, detergent, pigment food, monosodium glutamate, milk powder, salt, feed, chemicals, ceramics, plastics, rubber additives and other powders.
Horizontal ribbon mixer
When the horizontal ribbon mixer is mixing, the material is moved by two rotors moving in opposite directions, and the composite motion is carried out. The biaxial paddles are made of animal material along the inner wall of the machine slot for two clockwise rotations, close to the material at the axis. The shaft rotates, the axial direction is pushed from the inside to the sides, the outer spiral drives the material close to the wall to rotate, and the axial direction is pushed from both sides to the inside, thus causing convection circulation, shearing and mixing in the material cylinder, and completing the material in Mix quickly and evenly in a short time.
1. U-shaped barrel structure, stable operation, even mixing, no dead angle, clean discharge, wide application range.
2. Staggered round-trip mixing with inner and outer double-layered ribbons for fast mixing and high uniformity
3. The bearings are at both ends of the mixer, the material is not easy to enter, and the maintenance rate is low.
4. The screw conveyor is convenient to feed, the feeding port is flush with the ground, and the feeding is labor-saving and convenient.
The machine consists of two parts: feeding and mixing.
1. Feeding part: Entering from the feeding hopper, the material is lifted into the mixer through the spiral blade to enter the mixing drum for mixing and mixing.
2. Mixing part: When the material enters the mixing drum for the reciprocating motion, the mixing effect is good.
The difference between kneading machine and mixer
Some users often cannot distinguish between mixers and kneaders. In fact, kneading machines are equipment for kneading, kneading, vulcanizing, and polymerizing high-viscosity, elastoplastic materials. The kneading machine can be used to produce silicone rubber, sealant, hot melt adhesive, food base, pharmaceutical preparations and the like. The kneading machine is a special mixing and agitating device with two rake blades. The fast blades are usually at 42 revolutions per minute, and the slow propellers are usually rotated at 28 revolutions per minute. Different paddle speeds enable the mixed materials to be quickly Homogenize stirring.
In principle, kneader is a kind of semi-dry or rubber-like viscous plastic material, which can react quickly to obtain uniform mixing and stirring because of the strong shearing effect produced by a pair of cooperating and rotating blades. The driving part of kneader is driven by synchronous speed of motor, through elastic coupling to decelerator, fast slurry is driven by output device, so that it can reach the required speed, and also can be adjusted by frequency converter. The kneader has two_blades. The speed of the two blades is different. Different speed can be set according to different technology.