Hopper Screw Conveyor-DAHAN Vibration Machinery

What is hopper screw conveyor?

Hopper screw conveyor is used to automatically convey powder/granules into the hopper, and the whole production process is completely carried out in a closed environment. The machine can be connected with a mixer or a packaging machine. It is mainly used for conveying powder and granular materials between inclinations. The feeding size is less than 5mm. The silo and conveying pipe are made of stainless steel (the material can be based on customer requirements) to ensure that the raw materials are completely pollution-free during the conveying process. The conveying pipeline is made of stainless steel. The closed design can effectively prevent dust, and can effectively isolate materials with high hygiene requirements or strong odor. It has the characteristics of uniform feeding, good sealing performance and no dust pollution.

Types of Hopper Screw Conveyor

There are several types of hopper screw conveyors available, each designed to meet specific material handling requirements. Here are some of the common types of hopper screw conveyors:

1、Standard Hopper Screw Conveyor: It is a conveyor system for moving material horizontally or inclined and can be customized to meet specific operational needs, including the size and shape of the trough, the diameter and pitch of the helical blades, and the material of construction. They can be used to process a wide variety of materials, including powders, granules, and other free-flowing materials.

2、U-Trough Hopper Screw Conveyor: This type of screw conveyor has a U-shaped trough that is mounted on a hopper. The U-shaped trough helps to prevent the material from spilling over the sides of the conveyor, while the hopper provides a convenient storage container for the material.

3、Rectangular Hopper Screw Conveyor: This type of screw conveyor has a rectangular hopper that is mounted on the conveyor trough. The rectangular design allows for a larger storage capacity than other hopper designs and can be customized to fit the specific needs of the operation.

4、Live Bottom Hopper Screw Conveyor: This type of screw conveyor has a hopper with a special design that allows the material to be discharged continuously, without the need for intermittent feeding. The live bottom hopper can help to prevent bridging and clogging of the material, ensuring a steady flow of material to the conveyor.

Application of Hopper Screw Conveyor

Hopper screw conveyors are used in a wide variety of industries and material handling applications. Here are some common applications for hopper screw conveyors:

Food Processing: Moving ingredients such as flour, sugar or spices from storage containers to mixing or processing equipment. The enclosed design of the hopper and screw helps prevent contamination and maintain food quality.

Agriculture: Used to move grain, seed, or other agricultural products from storage silos or bins to processing or packaging equipment. The hopper helps protect the material from moisture and contamination, while the screw ensures efficient and reliable material handling.

Mining: Used to transport raw materials such as coal, ore or rock from storage hoppers to processing equipment. The enclosed design of the hopper and screw helps prevent dust and other contaminants from escaping into the environment.

Chemicals: Used to move powdered or granular materials such as fertilizers or plastics from storage containers to processing or packaging equipment. The hopper helps protect the material from moisture or contamination, while the screw ensures efficient and reliable material handling.

Pharmaceutical: Used to move ingredients such as powders or granules from storage containers to mixing or processing equipment. The closed design of the hopper and screw helps to maintain the purity and quality of the drug product.

Working Priciple of Hopper Screw Conveyor

During operation, after the material is conveyed to the shell of the screw feeder through the feeding port, the material is subjected to the centrifugal force and the frictional force of the pipe wall in the internal spiral groove, and rotates together with the spiral blade, and moves along the spiral under the action of gravity. The trough slides down, so that the material is continuously pushed forward and conveyed, and finally discharged evenly from the discharge port.

Benefits of Hopper Screw Conveyor

Efficient material handling

The screw inside the conveyor rotates to create a helical path along the inside of the chute, moving the material along the chute to the discharge end. This helical path ensures that material moves evenly and efficiently.

Feed rate can be adjusted

The feed motor and vibration motor can be switched independently to control the vibration amplitude. The system has a time relay. Set the time according to the set amount each time to control the feed amount.

Improve security

The silo and conveying pipe are made of stainless steel (the material can be customized according to customer requirements) to ensure that the raw material is completely pollution-free during the conveying process, and the conveying pipe adopts a closed design, which can effectively prevent dust.

Flexibility

It can be installed horizontally, and can also adapt to angled working conditions, and can even realize vertical transportation, instead of hoists to save production costs.

Efficient

The conveying direction of the feeding material is reversible, and the material can be fed in two directions at the same time, which can avoid the accumulation of the material at the end.

Save space

Smaller footprint than other conveyor types, ideal for operations with limited space. They can be easily integrated into existing production lines or configured to fit in tight spaces.

Hopper Screw Conveyor Specifications

Model		Diameter (mm)	Pitch (mm)	Rotating speed (r/min)	Capacity (m³/h)	Rotating speed (r/min)	Capacity (m³/h)	Rotating speed (r/min)	Capacity (m³/h)	Rotating speed (r/min)	Capacity (m³/h)
Small	100	100	100	140	2.2	112	1.7	90	1.4	71	1.1
	125	125	125	125	3.8	100	3	80	2.4	63	1.9
	160	160	160	112	7.1	90	5.7	71	4.5	56	3.6
	200	200	200	100	12.4	80	9.9	63	7.8	50	6.2
Small	250	250	250	90	21.8	71	17.2	56	13.6	45	10.9
	315	315	315	80	38.8	63	30.5	50	24.2	40	13.4
	400	400	355	71	62.5	56	49.3	45	38.6	36	31.7
Large	500	500	400	63	97.7	50	77.6	40	62	32	49.6
	630	630	450	50	138.5	40	110.8	32	88.6	25	69.3
	800	800	500	40	198.5	32	158.8	25	124.1	20	99.3

Selection Notes:

Material characteristics: The characteristics of the material being conveyed also affect the capacity of the conveyor. Materials with higher densities or larger particle sizes may require larger diameter screws or slower screw speeds. Materials prone to bridging or clogging may require a hopper or agitator with a tapered design to prevent clogging.

Hopper Size and Shape: The size and shape of the hopper affects the amount of material that can be stored and fed into the screw conveyor. Larger hoppers can hold more material and feed it into the conveyor at a faster rate, increasing the conveyor's capacity. The shape of the hopper also plays a role, with tapered hoppers better suited for materials that are prone to bridging or clogging.

Screw Diameter and Pitch: The diameter and pitch of the screw will affect the capacity of the conveyor. Larger diameter screws can move more material, while smaller diameter screws may be better suited for materials that require more precise handling. The pitch of the screw will also affect the capacity of the conveyor, the larger the pitch, the faster the material will flow.

Conveyor Length: Conveyor length also affects capacity, with longer conveyors requiring larger diameter screws or faster screw speeds to maintain the same material flow.

Structure of the Hopper Screw Conveyor

Hopper screw conveyor is divided into single tube and double tube. It consists of unloading device, screw shaft, feeding device, transmission device and other components.

Vibration motor: The feeding motor and the vibration motor can be switched separately to control the vibration amplitude. The system has a time relay. Each time the time is set according to the set amount, the feeding amount is controlled.

Hopper: The design of the hopper should consider reducing the pressure of the feeding screw, and if necessary, increase the decompression mechanism to improve the feeding accuracy.

The closed body prevents dust contamination.

Available options

Hopper Designs: Different hopper designs can be customized to meet the specific needs of the operation. Hoppers can be tapered to prevent material from bridging or clogging, or can be fitted with agitators to ensure a consistent material flow.

Screw configuration: The screw configuration can be customized according to the conveying material. Different screw diameters, pitches and flight configurations are available to optimize conveyor performance and ensure efficient material transfer.

Materials of Construction: Available in a variety of materials including stainless steel, carbon steel and aluminum. Materials of construction can be selected based on the specific requirements of the application, such as corrosion resistance or durability.

Discharge Options: Can be equipped with various discharge options such as sliding gates or rotary valves to control the flow of material at the discharge end of the conveyor.

Control and Automation: Machines can be equipped with controllers and automation systems to monitor and control the operation of the conveyor. This can include sensors to detect material levels in hoppers or conveyors, and variable frequency drives to control conveyor speed.

Mobility options: Can be designed with mobility options such as wheels or casters to enable easy movement between locations or integration into mobile handling systems.