How to use multihead weigher correctly

Author: Smartweigh–Multihead Weighter

The application of multihead weigher in modern scientific and technological industrial production is ubiquitous, because the resistor strain force multihead weigher itself is a kind of strong, durable and reliable electrical products, but in order to ensure the detection precision, there are still There are many problems to be paid attention to in application, so what should be paid attention to when applying multihead weigher? The following are some nine-level problems that must be paid attention to in multihead weigher application: 1. Multihead weigher should be set as much as possible around it“Separator”, and even cover the sensor with a thin metal sheet. This avoids contamination of the sensor and some moving parts with dirt, which“dirty”Often it makes moving part of a fitness exercise uncomfortable and compromises weighing precision. Whether the system software is uncomfortable with exercise can be identified in the following ways.

That is, add or subtract about one thousandth of the rated value load on the scale platform to see if the weighing indicator is reflected. If it is reflected, it means that the moving part is not affected“dirty”. 2. All transmission lines leading to the display information power circuit or drawn from the power circuit should use shielded twisted pair wires. The connection and connection address of the shielded cable should be valid.

If the grounding device is not based on the mechanical equipment structure, the grounding device is external, but the shielded cables are connected to each other without the grounding device and are suspended. Note: There are 3 sensors that are all connected in parallel. The sensor itself is a 4-wire system, but it is replaced by a 6-wire wiring method in the terminal block. The sensor output data signal reading power circuit should not be placed in the same casing as the thyristor, AC contactor, etc., which can cause obvious influence, and the machinery and equipment caused by a lot of heat. If this cannot be ensured, it should be Consider setting baffles between them to protect them, and installing cooling fans on the box body.

The electronic circuit used to accurately measure the output data signal of the sensor should be equipped with a separate power supply system transformer as much as possible, and it is not necessary to use the same main switching power supply with machinery and equipment such as AC contactors. 3. The inductors should use hinged copper core wires (section about 50mm2) to bypass electrical equipment to protect them from arc welding current or damage caused by lightning strikes. In inductor applications, it is important to prevent significant radiant heat, especially from one side.

4. Prepare the protective ground plane (such as the communication cable of the sensor, do not handle the layout in parallel with the weak current power plug or control wire (for example, it is not necessary to place the sensor power wire and the weak current power plug and control wire in the same pipeline). If they must If they are placed in parallel, the distance between them should be maintained above 50CM, and the power cord should be covered with a metal hose. 5. Use structural parts with automatic precise positioning (calibration) as much as possible, such as ball Type rolling bearings, spherical plain bearings, precision positioning tighteners, etc.

They can avoid some lateral force on the sensor. It should be noted that some lateral forces are not caused by the installation of mechanical equipment, such as lateral forces caused by thermal deformation, lateral forces caused by wind speed, and lateral forces caused by the vibration of some container-like electronic stirring devices, which are not mechanical caused by equipment installation. Some electronic parts must be received on the scale body (such as the feeding pipeline of the utensil scale, etc.), we should make them as soft as possible in the position where the sensor is loaded into the spindle bearing to avoid them.“swallow”The true load of the inductor is combined to cause a deviation.

6. Handle with care, especially the small-volume sensor made of aluminum alloy and polyurethane elastomer, all impact, falling, and its metrological verification characteristics are likely to cause great harm. For a multihead weigher with a large space, generally speaking, it has a large self-weight, so it is stipulated that appropriate lifting equipment (such as manual hoist, electric hoist, etc.) should be used as much as possible during transportation and installation. The mounting surface of the base where the sensor is installed should be leveled, cleaned, and free of all oil slicks, adhesive tape, etc.

The installation base itself needs to have sufficient compressive strength and rigidity, which is generally higher than the compressive strength and bending rigidity of the inductor itself. 7. Although the multihead weigher has a certain load capacity, the overweight of the sensor should still be avoided during the whole process of the weighing equipment installation. It should be noted that even a short-term overweight is likely to cause permanent damage to the sensor.

In the whole process of installation, if it is determined that it is necessary, you can first replace the sensor with a protective layer pad with the same aspect ratio as the sensor, and then replace the sensor at the end. When everything is working normally, the sensor should generally be set to the mechanical equipment parts for overvoltage protection. If the sensor is fixed with the screw of the extruder, a certain tightening torque is specified, and the screw of the extruder must have a certain depth of tightening external thread.

In general, the fixed extruder screw is selected because of the high toughness extruder screw. 8. In any case, the power plug and the control wire should be twisted together, and the level should be 50 rpm/m. If the sensor power wire must be increased, the specially made sealed cable terminal should be used. If there is no need for such terminals, and the cable is connected to the cable immediately (solder edge), it is necessary to pay attention to the solution of sealing and waterproofing. , the sensor should be calibrated again.

If the communication cable is long and high measurement accuracy is to be ensured, consideration should be given to selecting a cable containing a wireless repeater amplifier to compensate the power supply circuit. 9. Leveling: Leveling has two levels of content. One is that the installation plan of a single sensor installation base should be adjusted with a level gauge. In the weighing equipment with more than three devices, this point should be paid more attention, the key purpose of doing so is to make the load borne by each sensor basically the same.

The loading position of each multihead weigher is clear, and when you use it, you must load the load in this position. Lateral forces, additional bending moments, and torque forces should be minimized. If you strictly follow the above practical operation and application, the accurate measurement results obtained by the multihead weigher will be more accurate and convenient, and the multihead weigher will not be damaged casually, its service life and its maintenance. All are guaranteed to be stronger! .

Author: Smartweigh–Multihead Weighter Manufacturers

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