The loading section consists of one or more silos or other storage units, organised in one or more rows, suitable for receiving any type of product. The silos are built either as monolithic structures or prefabricated and bolted together. Depending on the requirements and whether they are to be placed indoors or outdoors, they can be made of various materials. Mainly steel or stainless steel, but also painted carbon steel, fibreglass, aluminium or with an internal coating suitable for contact with foodstuffs.
The design and construction of the silos, or other containers in the loading section, is done with great attention to environmental conditions, to counteract deterioration and keep the system in full working order. These elements must also meet hygiene requirements to avoid pests and mould, and safety requirements when handling hazardous materials.
The silos can rest on supporting legs, on a long self-supporting skirt on a base, or on a short skirt or support ring on a metal structure. Other possibilities include a self-supporting skirt or support ring resting on load cells. We also provide solutions for installation in seismic or very windy areas and for sealing in case pressurisation with nitrogen or dry air is required. The silos can be equipped with:
- Safety valves
- Breather and buffer valves
- Lung hoppers
- Star valves, guillotine valves, butterfly valves on discharge
- Screw conveyor
- Quick couplings for tanker loading
- Load cells
- Gravimetric load cells for product weighing
- Ventilation filters
- Loading pipes and curves, also with visual indicators
- Minimum and maximum level indicators
- Rotary, capacitive, vibration, microwave and ultrasonic level indicators
- Insulation and external coatings
- Dusting/decanting systems
Bag loading systems
Automatic/semiautomatic/manual bag cutters
Empty bag compactors
Access ladders and railings
It includes equipments for dosing and feeding the material into the pipeline. Depending on whether the system is in dense or dilute phase, this pneumatic conveying component can be of different types. The type also changes depending on the conditions and the material to be conveyed. For dilute phase transfer we can have:
This is constructed with two coaxial tubes and picks up material directly from the heap, similarly to a hoover. The outermost tube allows air to reach the inlet area, so it can be placed in any position because the air arrives with the secondary flow.
Rotor or star valve
Inside its outer casing there is a device with several vanes, mounted on a rotating shaft, which define many sectors. Above this valve is the container with the material to be moved, below is the transport pipe. The material enters by gravity, fills one of the sectors and then, thanks to the rotation, the material falls into the cell, with the advantage of being easily dosed. By adjusting the rotation speed, the material flow rate is regulated. If very high pressures are involved in the pneumatic conveying system, this component is not very suitable. Air can escape upwards and material can be dispersed.
Formed by an outer shell and a worm screw on the inside, the material is transported from one side to the other by running through the helix of the screw.
By adjusting the rotation speed, the flow rate is regulated. It is a very simple system that allows dosing and heating or cooling of the material before convey.
An extremely simple device based on the Venturi effect. A pressurised motor fluid is accelerated through a restriction so that the created vacuum draws in the material to be pushed into the line. With no moving parts, this is one of the most economical and easy-to-install solutions. There are conveyors suitable for conveying many different types of materials and for a variety of industrial requirements.
Pneumatic conveying component mounted on flexible leaf springs and driven by a pneumatic/electric linear vibrator. It is suitable for fast and precise conveying of products that cannot be demixed or broken. By acting on the vibrator, very fine adjustment of the system’s flow rate can be achieved. It is suitable for conveying powdered and granulated products, even large, abrasive and delicate products, even at high temperatures. Examples are ice cream mixes, chocolate chips, dried fruit, milk powder, sugar, fresh vegetables, olives and grated cheese.
For the dense phase, the equipment in the transfer section is usually a propeller, called a transporter. This is a pressurised vessel with a capacity ranging from a few to thousands litres. The material to be moved is loaded into this propeller tank, which is then pressurised, normally between 1 and 6 bar depending on the required performance.
Once the necessary pressure is reached, the discharge valve is switched so that the material can flow down the pipe. The thrusters can also work in pairs: while one is charging, the other is conveying. This results in almost continuous dense phase transport. The equipment includes control devices and instruments such as digital pressure switches, pulsed valves, maximum level indicators, butterfly valves with actuators and limit switches, load cells.