Basic principle and installation of digital multihead weigher

Author: Smartweigh–Multihead Weighter

The basic principle of digital display multihead weigher The digital display sensor system software is a new type of electronic device multihead developed by integrating contemporary electronic information technology and microcomputer technology based on the traditional resistor strain force sensor. weigher. The digital display multihead weigher is composed of two parts: a simulated analog sensor (resistor strain force type) and an intelligent transformation control module. The data control module is made of high-width ratio integrated electronic circuit, which is made of SMT surface patch technology. The key includes amplifier, A/D converter, microcontroller (CPU), storage, communication interface (RS485) and intelligent chemical temperature sensor, etc.

The basic principle and installation of the digital display multihead weigher The digital display multihead weigher has the following characteristics: 1. The digital display sensor adopts an integrated A/D conversion power supply circuit, intelligent data signal transmission and digital filtering Technically, the data signal transmission distance of the sensor is long, up to 1200M, and the anti-interference is strong. The transmission distance of the pulse signal in the digital sensor is very short. In addition, the sensor casing (polyurethane elastomer) itself is also an excellent shield. These two characteristics determine the advantages of its anti-interference, and improve the reliability of the sensor to a very large level. 2. Good security, anti-fraud function, can reasonably avoid controller fraud, once found, it will automatically use false alarms, which strongly ensures the safety factor and accuracy of data information. Electronic truck scales using digital and analog sensors are widely installed with auxiliary devices. Several enterprises with digital and analog electronic truck scales around the Shouqin enterprise have basically been equipped with auxiliary devices, resulting in very large property losses.

Because of the small size of the auxiliary device and the extremely simple installation, it is not easy to be detected, which leads to a huge safety hazard for the safety factor of the metrological verification data information. The large and medium-sized trade electronics of Shouqin enterprises (except dynamic rail scales) have already been intelligently updated and transformed into digital display electronic truck scales, thereby ensuring the safety factor of metrological verification data and information. It better maintains the economic development rights and interests of Shouqin enterprises. 3. Because the digital display sensor has the functions of automatic collection and preparation, storage and memory, and has a unique identification, multiple sensors can be connected in series to check the status of each sensor, which is conducive to fault detection.

The digital sensor used by the Shouqin enterprise is the YCCA-Ⅱ-D type produced by the diamond-level enterprise, and the carrying capacity of a single sensor is 50005kg. At the beginning, the electronic truck scales and rail scales of Shouqin enterprises were all digital and analog sensors, and the operation status of the machinery and equipment was unstable. Every time a problem occurred, it was difficult to distinguish which sensor was not good. Only by opening the terminals Check the data signal status of each sensor, and use the enumeration method to check one by one. It takes a long time to find a bad sensor. After solving the problem, you should contact the metrological verification staff of the Quality and Technical Supervision Bureau to carry out metrological verification. The cost of metrological verification has changed from twice a year to several times. Human resources, material resources, and funds have all led to a very large consumption. , the most important thing is to have a bad impact on all the normal production of the enterprise.

Since the implementation of the intelligent renovation, many problems that have occurred before have been resolved. The machinery and equipment are in good condition and the operation is relatively stable. Even after the second phase of the project is completed and put into production, the daily volume of incoming materials has increased by 1. Under the circumstance of 2 times, the situation of the digital display sensor is still very stable, and there are no problems, which fully shows the advantages of the digital display sensor and its key functions in specific production. Four,. The digital sensors have been quantitatively analyzed and solved at the original factory, and the consistency is excellent, and there is no need to calibrate again after replacement.

2. Each digital display sensor is equipped with a high-precision A/D block and CPU, so the host computer software can load the real-time situation of each digital display sensor, and for this purpose, it is used to monitor whether the sensor is in Everything is running normally. 3. The standard multi-thread serial communication RS-485 communication is used, so the transmission is far (how many kilometers) and the anti-interference is strong. At this stage, the digital multihead weigher has been widely used in various weighing equipment such as electronic floor scales, electronic device track scales and electronic belt scales.

The basic principle of digital multihead weigher and installation of digital multihead weigher installation 1. The mounting surface of the base on which the sensor is installed should be leveled and cleaned, and there should be no oil slick, 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. 2. The multihead weigher should be handled with care, especially the small-volume sensor made of aluminum alloy and polyurethane elastomer. All impact and falling may cause great harm to its metrological verification characteristics.

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 far as possible during transportation and installation. 3. The loading position of each multihead weigher is clear, and when you use it, you must load the load at this position. Lateral forces, additional bending moments, and torque forces should be minimized.

4. Leveling adjustment: There are two levels of leveling adjustment. 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. 5. The surrounding of the multihead weigher should be set as much as possible“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. 6. As far as possible, select structural parts with automatic precise positioning (calibration) functions, such as ball rolling bearings, joint bearings, precise 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. 7. Some electronic accessories 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. 8. 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.

9. Although the multihead weigher has a certain load capacity, during the whole process of the weighing equipment installation, the overweight of the sensor should still be avoided. 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. 10. Whether the system software is uncomfortable with fitness 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”.

11. If the sensor is fixed with the screw of the extruder, a certain tightening torque is required, 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. 12. In the application of the sensor, it is necessary to prevent obvious radiant heat, especially the obvious radiant heat on one side.

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