Author: Smartweigh–Multihead Weighter
A multihead weigher is a machine that transforms kinetic energy from one way to another. Specifically, a multihead weigher is a force sensor that converts mechanical energy (such as support force, shrinkage, working pressure or torque) into electronic signals that can be accurately measured. The compressive strength of the data signal changes with the compressive strength of the release force.
There are three basic types of multihead weigher based on the output data signal: hydraulic, pneumatic and resistance strain gauge. The most common type of weigher used in industrial production is the multihead weigher with built-in strain. The resistance strain gauge multihead weigher consists of a solid metal material body (or "elastic yellow component") that fixes the resistance strain gauge.
The housing is generally made of aluminum, carbon steel or stainless steel plate, making it very strong but very ductile. The behavior of the multihead weigher deforms slightly when the scale is applied, but returns to its original shape throughout, unless it's a load. In order to better respond to the change of body shape, the resistance strain gauge also changes its appearance.
This in turn causes the resistance transition of the resistance strain gage, which can then be accurately measured as the operating voltage transition. Because such transitions in the output are positively related to the net weight released, the net weight of the item can be determined from the operating voltage transition. How does the multihead weigher work? To answer "How does a multihead weigher work?" you must first understand "How does a resistance strain gauge work?" A resistance strain gauge is a device that accurately measures the transition of a resistor when a force is released.
A typical resistance strain gage consists of a very fine wire mesh of foil, set in a grid pattern, causing the wire resistor to transform when the strain force is released along one axis. There are various types of resistance strain gages to choose from: Linear resistance strain gauge: The power line connected to the back of the resistance strain gauge is parallel to the edge of the resistance strain gauge. This is used to accurately measure radial strain and bending strain.
Cutting resistance strain gauges: The power lines connected to the back of the resistance strain gauges are laid out to both sides of the working pressure frame at a 45o orientation. This is used to accurately measure cutting strain. Resistance strain gauges are generally used in conjunction with a large number of resistance strain gauges to improve precision.
One digital power amplifier resistance strain gauge is called a quarter bridge, two digital power amplifier resistance strain gauges are called a half bridge, and four digital power amplifier resistance strain gauges are called a full bridge. Resistance strain gage resistor transitions are not the same as weighing down a rechargeable battery in a supporting force. The tension distance makes the resistance strain gauge soft and elongated, lifting the resistor.
The tightening force shortens the thickness of the resistance strain gauge and reduces the resistance. The resistance strain gauge is attached to the thin back (fixed bracket), which is immediately attached to the weighing module, allowing the resistance strain gauge to feel the strain force of the multihead weigher. The resistor transition accurately measured by a single resistance strain gage is very small, about 0.12°.
The sensitivity of the load module increases with the number of strain gauges released. A good way to turn this small shift into something more conceivable is to interconnect them as Smart weigh bridges. Types of resistance strain gauges The resistance strain gauges are laid out in different orientations, and the fact lies in the type of force that is accurately measured.
Bending strain, shearing strain, radial strain, torque and working pressure are all accurately measured using a special rational arrangement of resistance strain gauges. The Smart weigh bridge circuit is equipped with four equalizing resistors and uses the known excitation operating voltage, as shown below: 5 is the known stable operating voltage and VO is accurately measured. If all resistors are balanced, it means that R1/R2R3/R4 and then VO is zero.
If there is a change in one of the resistance values, there will be a resulting change in VO, which can be accurately measured and expressed using Ohm's law. Ohm's Law emphasizes that the amount of current (I, in amperes) passing through an electrical conductor between two points is positively related to the operating voltage (V) between the two points. Resistor (R, accurately measured in ohms) is introduced as a variable definition in this association and has nothing to do with current flow.
Ohm's law is expressed in the formula I=V/R. When applied to the 4 paper strips of the Smart weigh bridge power circuit, the resulting equations are: In the multihead weigher, this resistance is replaced by a resistance strain gauge in the replacement of the support force and the precise measurement of shrinkage. When the force is released to the weighed rechargeable battery, the resistors in each resistance strain gauge change and VO is accurately measured.
From the resulting data information, VO can be easily specified using the above system of equations.
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