Paddle Mixer

What is a paddle mixer?

A paddle mixer is an industrial equipment that achieves fluid mixing by rotating the paddle. Its core structure includes a motor, a reducer, a stirring shaft and a paddle. When working, the motor drives the paddle to rotate, generating centrifugal force to drive the liquid to form a circulation flow, thereby achieving the purpose of mixing. 

Depending on the shape of the paddles (such as flat paddles, inclined paddles, folded paddles) and the arrangement of the paddles, the paddle mixer can meet the mixing needs of low-viscosity to medium-viscosity fluids, and some designs can even handle high-viscosity fluids. Its rotation speed is usually low, but the mixing efficiency is high, and it can quickly mix materials of different components evenly. 

Classification of paddle mixers

Paddle mixers are mainly divided into single-shaft paddle mixers and double-shaft paddle mixers according to the number of their mixing shafts. Their main differences lie in structure and mixing effect.

Single-shaft paddle mixers have only one central rotating shaft, and the paddles are installed on this shaft. The structure is relatively simple and is suitable for mixing materials with good fluidity such as powders, granules or small amounts of liquid. The mixing action is relatively mild and is often used for mixing small and medium batches in industries such as pharmaceuticals and food. 

Twin-shaft paddle mixers have two parallel, usually counter-rotating mixing shafts, each equipped with paddles, which can produce a stronger mixing action and higher mixing efficiency, and are more suitable for handling large batches, heavier or more complex materials, such as mixing solids and liquids. The twin-shaft design helps avoid material agglomeration and achieve more uniform mixing, and is widely used in industries such as chemical, agriculture, and construction.

What is the difference between a paddle mixer and a ribbon mixer?

Features	Paddle mixer	Spiral mixer
Images
Mixing element	Paddles mounted on the shaft (can be of different shapes and numbers)	Usually a spiral ribbon around the central axis
Mixing action	Mainly shear and circulation, the mixing action is relatively mild	Mainly convection and shear, the axial and radial mixing of materials is stronger
Applicable materials	Suitable for powders, granules and small amounts of liquids with good fluidity	Suitable for powders, granules, pastes, and also good for viscous materials
Mixing uniformity	Suitable for less demanding mixing uniformity requirements	Usually can achieve higher mixing uniformity
Viscosity range	Low to medium viscosity	Medium to ultra-high viscosity
Typical speed range	Medium speed (30~150 rpm)	Extremely low speed (10~60 rpm)
Application scenarios	small and medium batch mixing in pharmaceuticals, food, etc., where the material is less destructive	chemical, food, feed, etc., where a higher mixing uniformity is required

Working principle of paddle mixer

The rotating blades distribute and mix the materials in turn, and make each particle pass through the mixing chamber quickly and violently. Due to the determination of the blade angle, the mixer exhibits excellent axial and radial dispersion. Shorter mixing time and better mixing effect enhance the value of paddle mixers and make their application more extensive. 

When working, the two shafts with counter-rotating blades rotate in different directions, driving the blades to rotate at different angles, so that the material is cyclically flipped in the axial and radial directions. Under the action of high linear speed, the material is thrown up and down in a weightless state.

Structure of paddle mixer

Paddle: usually made of flat steel, it is a component that directly contacts the material and realizes the mixing function. It is fixed to the hub or impeller by welding or bolts. The number of blades is generally 2, 3 or 4, and the form can be divided into two types: straight blade and folded blade.

Motor: Provides power source for the mixer and drives the blades to rotate. There are many common motor protection levels and insulation levels.

Reducer: Reduces the high speed of the motor to a low speed suitable for mixing, while increasing the torque so that the blades can mix at a suitable speed and force.

Mixing shaft: Connects the reducer output shaft and the blades, transmits power, and enables the blades to rotate around the axis.

Frame: Used to support components such as motors, reducers, and mixing shafts to ensure the stability of the entire mixing device. Carbon steel plates are usually welded to form a rigid truss support structure.

Shaft seal: Prevents material leakage in the mixing tank and also prevents external impurities from entering the mixing tank.

What are the advantages of paddle mixers?

High-speed mechanism is used to optimally and intensively mix dry powders in a relatively short cycle time. Batch or continuous types are available.

Flexible design with multiple mixing elements and high-speed choppers for mixing liquids and powders, center or bomb bay discharge to improve cycle time.

Excellent mixing homogeneity in short time

Abrasion resistant and heavy duty design for processing abrasive material

Big size discharge valve to minimize residues

Top high speed lump breaker device for de-agglomeration requirement

Paddle mixer technical specifications

Gross Volume(L)	Effective Volume(L)	Overall Dimensions(mm)			Shaft Speed(rpm)	Approx.Weight (kg)
		A(length)	B(width)	C(height)
200	80-120	1200	1200	750	43	270
300	120-180	1300	1400	930	43	450
500	200-300	1500	1600	1050	43	900
1000	400- 600	1900	1600	1200	43	1190
1500	600-900	2200	1700	1325	43	1600
2000	800-1200	2400	1700	1600	43	2700
3000	1200-1800	2500	1850	1760	43	3200
4000	1600 -2400	2900	2200	1850	29	4500
5000	2000-3000	3100	2300	2040	29	6000
6000	2400-3600	3300	2500	2100	29	7000
10000	4000-6000	3800	2900	2500	29	9000
130 00	5200-7800	4200	3200	2500	25	9700
15000	6000-9000	4400	3400	2600	25	11000
18000	7200-10800	4700	3700	2500	25	12500

Parameters of paddle mixer

Model	A	B	C	Working Volume(m3)	Empty Weight(kg)
DH-0.05	1290	660	837	0.03	230
wZ-0.2	1124	1110	720	0.12	260
DH-0.4	1400	1250	1030	0.24	450
DH-0.5	1450	1500	950	0,3	800
DH-1	1800	1800	1350	0.6	1150
DH-1.5	1850	1950	1180	0,9	1500
DH-2	2200	2400	1600	1,2	2800
DH-2.5	23 00	2300	1620	1.5	4200
DH-4	2680	2400	1850	2.4	4500
DH-5	2950	3050	2040	3	6000
DH-6	3050	3250	2100	3.6	7000
DH-10	3550	3150	2400	6	8000
DH-12	4695	3180	2500	7.2	10500
DH-15	4180	3960	2600	9	10000
DH-20	5700	3700	2500	12	13000

What is a paddle mixer used for?

Paddle mixers are widely used in sewage treatment, chemical industry, pharmaceutical industry, food and other fields. In sewage treatment, it is used in mixing tanks, sedimentation tanks, etc. to promote the contact between microorganisms and organic matter and accelerate the degradation process; in chemical production, it is used for material mixing and mass transfer in the reactor to improve the reaction speed and efficiency; in the pharmaceutical and food industries, it is used for uniform mixing of raw materials to ensure product quality and stability. In addition, paddle mixers are also suitable for continuous operation and mass production, and are an indispensable and important equipment in industrial production.

Thermal power plants, metallurgy, cement plants, pesticides, building materials, battery manufacturing, chemicals, paint and pigment industries, food and pharmaceutical industries, animal feed, sewage treatment, magnetic materials, ceramic industries.