Belt Weighing Systems


libra belt weighing systems

Libra Weighing offers a broad range of belt scales to suit multiple process weighing applications.

Six different models guarantee the possibility of one or more alternatives for every application. Within different markets, there are many ways to use a belt scale to measure the actual flow on a conveyer belt which can also be used for dosing your product. Examples of markets in which belt scales are frequently used are the food, recycling, chemical, and tobacco industries, steel, animal feed, and compost production, sand and gravel quarries and harbor logistics.


libra belt weighing system overview

Operation

A belt scale consists of a weigh frame with one or more load cells, a speed pick up and a weigh processor, which integrates the two signals (kg/m and m/s) into a value of kg or tons per hour. The selection of the weigh frame and speed pick up is determined by the requested accuracy, variables like belt speed and inclination of the belt, the structure of the transport belt, and external circumstances like moisture and aggressive environment.

The execution of the weigh electronics is determined by the requested functionality (only measurement of the product quantity or the need to control the dosing of the product) and the way of communication with a PLC/PC (or other). Furthermore, the wish of an approval (MID), Atex classification, the use of test weights and external circumstances can influence the selection of optimal weigh electronics.

Weighing Terminal

We provide an approved weigh processor, which can beused in most applications for dynamic weighers, likeBelt scales, Screw weighers, Bulkslide Flowmeters andImpact Flowmeters. It provides a readout of the actualflow in kg per hour (or ton/hour) or the total in kg (ortons) and has three totalizers.

In addition to the basic functions of dynamic weighers,the weighing terminal also has Batch functionality and a PIDcontrol function, which can be used to control the capacity in function of a setpoint. Multiple input and output configurations are available with these units.


LBS143

belt weighing scale

The LBS143 model weighs three idlers on an inner frame that is supported by four load cells. This makes it the most accurate belt scale and is particularly qualified for higher capacities and high belt speeds. It is often used in OIML certified applications at harbors for loading ships and trucks, and to offload bulk cargo. The frame is custom made using the specifications of the conveyor belt, making it suitable for most models of belt conveyors.


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LBS221DB

pivot arm belt scale

The LBS221DB model consists of two arms, each equipped with a pivot and a load cell, that are mounted to the outside of the side supports of the conveyer belt. The idler or weighing roller will be mounted on top of both arms. This model provides easy assembly and good accessibility for service. The LBS221DB is suitable for most belt widths and capacities, which makes it applicable in various market segments.


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LBS211

heavy duty belt scale

The LBS211 model consists of an inner frame that is mounted in two friction-free pivots on one end and at a load cell on the other end. An idler is mounted on the inner frame. The pivots absorb the tensile stress in horizontal direction, creating a very solid weighing frame that is also suited for heavy-duty applications.


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LBS311

roller beam belt weigher

The LBS311 model consists of an idler or roller placed on a simple load cell beam, which makes it a very cost effective solution. Suitable for belt widths up to 1000 mm and belt speeds up to 1,5 m/s. This frame is often used in dosing belts that can regulate the capacity of a bulk flow using the measured value and a controlled belt speed.


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LBS421

accurate belt scale

The LBS143 model weighs three idlers on an inner frame that is supported by four load cells. This makes it the most accurate belt scale and is particularly qualified for higher capacities and high belt speeds. It is often used in OIML certified applications at harbors for loading ships and trucks, and to offload bulk cargo. The frame is custom made using the specifications of the conveyor belt, making it suitable for most models of belt conveyors.


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LBS611

traverse beam conveyor belt scale

The LBS611 model differentiates itself from other models because the frame rests upon two traverse beams. Two models are available, which are easily built in a conveyor belt. The basic model is suitable for belt widths up to 800 mm. For belt widths up to 1200 mm, there is a second model. This belt scale is meant for mid-range bulk flow applications.


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