The most popular force sensor or Loadcell is one of the most popular force sensing devices today. However, to better understand what is Loadcell? The structure, operating principle and application of Loadcell are not well understood by everyone.

Viewing: What is a load cell

What are load cells?

Loadcell is one type of load transducer; is used for the purpose of generating an electrical signal where the force being applied is proportional to the magnitude. Currently, load cells are manufactured and manufactured into popular types such as: Strain Gauge Loadcell, Pneumatic Loadcell and Hydraulic Loadcell. So, depending on the type of circuit used and the different Loadcell, it will affect and change the current, voltage and digital signals.

Modern load cells

Most current load cells mainly use Strain Gauge resistors. Electromagnetic and capacitive force compensation techniques. So, on the market today, the type of Loadcell Strain Gauge that uses the most resistors is used the most, because it works on the principle of changing the available voltage to be able to support meeting the needs of a user. load applies.

Characteristics of Loadcell

After having a better understanding of what a Loadcell is, everyone should learn more about the bridge generator of this type of load probe. Currently, with a type of Loadcell mainly composed of Strain Gauge (resistor) glued directly to the body surface of the Loadcell.

The body of the Loadcell is simply a block of metal with outstanding elasticity. Depending on the purpose of use or each type of Loadcell, there will be designs and made from different metals. Typically, some types of Loadcells are made of steel alloy, stainless aluminum alloy, etc.

How does the Loadcell work

?Based on the structural characteristics of the Loadcell; then the resistor circuits from R1 – R4 are connected directly to each other to create a Wheatstone resistor bridge, which is then glued directly to the body surface of a Loadcell. You can refer to the following operation diagram of a Loadcell:

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Structure diagram of loacell

When in the no-load state (equilibrium state) of a Loadcell, the output signal voltage parts are approximately zero or zero when four resistors from R1 – R4 are mounted in a position that corresponds to the equivalent value of it. Therefore, the Wheatone bridge resistor is called a balanced bridge circuit in a load cell.

In addition, people can better understand the working principle of Loadcell in the following figure:

Working principle of Loadcell

When starting to have a direct contact load on the load cell’s body surface, it will cause it to deform and can compress or expand. With this operating principle, Strain Gauge resistive metal threads can be changed in cross section and length. This will result in the value of the resistors being affected. This effect will lead to a direct change to the output voltage but very small. Therefore, it is converted to digital after it is passed through the amplifier of the weighing head, or electronic weighing indicator.

How is Loadcell created

?Loadcell production process has to go through many different stages to be able to supply; The most accurate results in the field of weighing and measuring. The following are some basic Loadcell fabrication stages that will help everyone better understand the Loadcell manufacturing process.

Carrying out cleaning and machining of Loadcell body

This is one of the important stages. And it is quite complicated to be able to optimize the exact positions for gluing Strain Gauge resistors. In this step, everyone needs to control the roughness of the Loadcell body surface. Especially in places where the resistor will be glued by effectively polishing the surface to remove roughness. With the above method, it will help to increase the adhesion when gluing the resistor directly to the Loadcell body is more solid.

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Clean the surface of the Loadcell body

Proceed to dip glue into the Strain Gauge resistor sheets into the Loadcell body

After polishing and cleaning the Loadcell body; will begin to apply a layer of specialized adhesive to glue the resistor panels directly to the body. At this step requires careful meticulousness; in order to be able to glue the resistor plates to the Loadcell body accurately and firmly.

Stick the resistor plate to the Loadcell body

Create a strong bond between the Strain Gauge resistor plate and the Loadcell body

In this step, everyone will use an injection mold to be able to create pressure between the Loadcell body and the Strain Gauge resistor plates that have just been glued. This mold will be placed in a high temperature environment. This will help to strengthen the adhesion of the glue layers between the Loadcell body and the resistor plates, which will be stronger.

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Re-calibrate the load at different positions of the Loadcell

In this step the Loadcell will be installed directly into a frame of the platform. In particular, the body of the Loadcell must be polished and polished; Adjust until the same parameter is displayed, the same load, no matter how much it is placed on any corner of the scale, stop.

Load correction process loadcell

Accurately check the Loadcell signal part according to each temperature change

This is one of the important steps to know if the Loadcell is working correctly or not. At this time, the loadcell will be placed in a sealed chamber with the same ambient temperature; The same output signal voltage is adjusted from low to high within a certain range.

In case the signal result of the Loadcell output voltage is incorrect. Or if the requirements are not met, an additional resistor must be used; Integrated temperature compensation with Strain Gauge resistor plates.

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Silicon coating protects the Loadcell

This is the final step in the Loadcell manufacturing process. In this step, the body surfaces of the Loadcell and the Strain Gauge resistor panels will be coated with a special silicon layer to help protect the electronic wiring and resistor circuits from being affected by environmental factors.

Silicone coating on Loadcell surface

What is the application of Loadcell

?Based on the principle of operation and rigorous production process. So Loadcell is often installed into the electronic weighing system. At the same time, the Loadcell line of electronic scales is applied to many different industries; can be used for weighing due to measurement related to a number of common areas such as:

Loadcells are applied in many fields and industries

– Construction industry: Producing iron and steel, cement.

– Transport industry: Accurately check the tonnage of the vehicle.

– Mineral industry: Import and export of goods, mineral processing, coal mining, etc.

Agriculture: Processing agricultural products, importing and exporting agricultural materials, checking the volume of agricultural materials, …

– Hotel, restaurant, supermarket industry: Usually, Loadcell electronic scales are used for the purpose of accurately weighing materials in/out.

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How much is the current price of a Loadcell

?Currently, there are many different types of Loadcells on the market. Depending on each component material, size, design, type, usage environment, etc., there will be different prices. However, the price of a Loadcell currently only fluctuates between 300,000 – 5,000,000 VND. So, depending on your needs, purposes and finances, you can choose the most suitable type of Loadcell.

Loadcell is one of the outstanding applications in electronic weighing equipment today. Through the above information, it has partly helped people better understand what Loadcell is? Structure, operation principle and application of Loadcell in various fields of life