The liquid dosing system mainly consists of a storage system in accordance with MIE APQ (0 to 10) depending on the product. This storage is equipped with a filling system from the product container (from IBC, tank, etc.), a measurement system (cells, radar, maximum levels), and, if necessary, may have an agitation, heating, or cooling system.

Subsequently, a process delivery system is available. Depending on the required precision, the system will have a pumping system which may be controlled by measurement in the storage tank (by discount), online flow meter, or reception hopper with precision weighing.

The type of pumping system will depend on the product to be dosed, as well as the materials and treatments for the system piping.

Liquid storage and dosing systems enable greater management of raw materials, as well as greater automation of the production process. One of the main advantages of additive dosing systems is the ability to ensure uniform volume of work for dosing, reduction of errors in the process, and improvement in purchasing management due to its automation.

At GMdix Process Engineering, we offer solutions for both volumetric and gravimetric dosing by weight loss or gain, for both principal or secondary products, continuous or discrete (in batches).

We have a wide variety of hoppers, through screws, rotary valves, belts, vibrating channels, accessories, and control systems to adapt to the needs of our clients. We cover a wide variety of grain or powder materials, as well as low and high dosing rates.

As manufacturers of this industrial equipment, we are able to adapt to the requirements of our clients.

Types of dosing systems:

Volumetric dosing:

The flow of material is regulated according to the speed of the dosing element, usually by a screw, which must be suitably selected to provide the required flow rate with the required dosing precision.

Gravimetric dosing:

Material flow is continuously regulated based on weight, thus variations in apparent density, or grain size, do not affect the accuracy of the process.

All the components of our equipment are selected based on the characteristics of the products to be dosed, while always complying with dosing precision, ease of use, and longevity parameters.

All our gravimetric feeders are supplied with state-of-the-art microprocessors touch controls with easy-to-use operator interfaces.

Construction materials may be very different depending on requirements. These may be carbon steel, stainless steel, etc. Different non-stick surface finishes and abrasion resistant coatings are also available.

Depending on the products to be handled, we offer equipment with internal agitators for materials with poor fluidity.

We also offer solutions for easy disassembly and cleaning, which enable quick product changes.

The maximum allowable temperature for this equipment is 80ºC-250ºC. For higher temperatures it is necessary to consult GMdix.

Options: These may be configured with multiple options: bag feed hopper, Big-Bag loading, quick-close valves at the outlet, etc. Also available for installations in classified areas (ATEX areas).

We have a testing laboratory to analyse the client’s product so as to select the best design and suggest handling and transport conditions that enable process optimisation.

The hopper is a container similar to a large funnel into which the product is loaded from the top. It has capacity to store a sufficient quantity to carry out uniform and efficient channelling thanks to the deep slope which allows complete emptying of the product while preventing loss. All types of sensors to monitor its operation are common additions for precise control over its usefulness.

There are infinite variations given that our industrial equipment is adapted to each client’s needs. Hoppers of all types of capacities and sizes may be manufactured, both in carbon steel and stainless steel, with specific finishes and surface treatments for these materials. Likewise, pressure, jacketed, and heat-insulated hoppers are also available; all of them may be combined.

This technology is a system that enables powder materials to be conveyed suspended on an air bed.

Air enters the airslide through threaded sleeves and is distributed over the entire surface. Once sufficient internal pressure is achieved, the air exits through the porous fabric, starting the process of fluidising the material. Fluidisation allows particles to be separated by surrounding them with air bubbles and keeping them loose.

Finally, the material is conveyed due to the slope of the airslide between 4º and 10º.

Tanks receive the product through one or more inlets to be stored. The product will then be conveyed to its next destination. The objective of this application is to maintain the product with the required characteristics. Therefore, element properties such as temperature, pressure, homogeneity (in the case of a mixture of immiscible products) are often taken into account. In order to ensure that these objectives are met, tanks are equipped with all types of sensors to monitor their ideal operation.

There are infinite variations given that our equipment is adapted to each client’s needs. Tanks with a capacity of 5 litres or more may be manufactured, both in carbon steel and stainless steel, with specific finishes and surface treatments for these materials. Likewise, pressure, jacketed, and heat-insulated tanks are also available, with agitators or recirculation; all of them may be combined.

The through screw, also known as the Archimedean screw or helical screw, is made up of a toothed blade in the form of a helix that extends longitudinally along the shaft of the screw. Between turns of each screw, a space is formed in which the materials to be conveyed are deposited, which rise or advance each time the screw turns.

To move the through screw, a motor is installed, which is in contact with its helix that makes it rotate every time the motor turns. This motor rotation transfers the movement to the through screw.

The characteristics of the through screw used in each industrial installation depend on the flow to be dosed, the type of product, the point of origin, and the discharge point.

Parts of a through screw conveyor:

1.- Conveyor (through screw)

The conveyor is comprised of a through screw, which is basically a helix wound on a central shaft that makes it rotate. The helix may be helical or sinusoidal, and is sometimes replaced with blades, depending on the materials to convey.

The helices are made up of different ridges, separated by a certain distance (known as spacing). The ridges or helices also have a diameter, which is calculated according to their intended use.

2.- Housing

The housing is the structure that surrounds the through screw and through which the materials conveyed by the screw circulate. It is normally tubular or U-shaped and has a larger diameter than the helix.

• Tubular through screw feeders and risers:
  Ideal solution for dosing products at short distances. The standard measurements for this type of through screw range from Ø65 mm to Ø400 mm with lengths and designs tailored to each application.
•  U-type trough through screw feeders:
  Ideal solution for dosing products at short and medium distances and for processes that require interior inspection of the equipment. Custom lengths and designs for each application.

3.- Motor

The electric motor is connected to the screw shaft and drives its operation. This is an electric motor with a speed reducer coupled to the housing bedplate. Motor power must be in accordance with the distance that the material must travel and the weight to convey.

4.- Hopper or loading area

Constructed in sheet metal just like the housing, this is the receptacle through which the bulk material to convey is introduced.

GMdix provides effective functional engineering for silos, containers, and hoppers. Unique design characteristics for reliable processing and handling of bulk powders and solids. Our designs take into consideration:

Based on product properties and process engineering requirements, we plan and deliver:

Selection of construction materials takes into account product properties, procedural techniques, and specific sector requirements.

The following options are available: