WeightWorth Teaches You to Unlock the Code for Long-Term Operation of Weighbridges - Professional Maintenance Guide
Professional Maintenance Guide
Hello everyone, I am a technical engineer from Vishay. In the field of industrial weighing, weighbridges, as "weight scales", are core equipment for trade settlement, production control, and logistics measurement.
Their accuracy and stability are directly related to the economic benefits and operational efficiency of enterprises. Having been engaged in weighbridge R&D and services for many years, we have seen too many cases of accuracy deviations, frequent failures, and even premature equipment scrapping caused by neglect of maintenance.
Today, from a professional perspective, I will teach you how to scientifically maintain weighbridges, allowing your "weighing partner" to maintain optimal performance for a long time.
Understand Weighbridges First: The Premise of Maintenance is "Knowing Why"
Although weighbridges seem simple in structure, they are actually composed of four core components: the scale body, sensors, junction box, and instrument (or weighing system). Problems in any link will affect weighing accuracy. Whether it is a digital, analog weighbridge or an unattended intelligent weighbridge, the core logic of maintenance is consistent - anti-corrosion, anti-interference, anti-wear, and regular calibration. The difference is that intelligent weighbridges need additional attention to the stability of electronic components and software systems, which we will elaborate on later.
First of all, it should be clear: weighbridge maintenance is not "done only when there is a problem", but a preventive work that is "done regularly and continuously". Just like regular car maintenance can extend its service life, the daily maintenance investment in weighbridges is much lower than the cost of repair after failure, and it can also avoid trade disputes caused by accuracy deviations.
Daily Maintenance: 5 Minutes a Day to Build a Solid Safety Line
Daily maintenance is the foundation of weighbridge maintenance. It is simple to operate but crucial. It is recommended to be performed by on-site operators every day to form a habit.
1. Scale Body Cleaning: Refuse "Dirt Accumulation"
Debris, sludge, gravel and other foreign objects are easy to accumulate under and around the weighbridge body. These foreign objects will prop up the scale body, causing the scale body to fail to bear force normally during weighing, resulting in problems such as "inaccurate weighing" and "value drift". Especially in rainy seasons, construction sites, mines and other dusty and muddy scenarios, cleaning work should be more frequent.
Operation Points: Check the surroundings and bottom of the scale body before work every day, and clean up debris with a broom and high-pressure water gun (note that the water pressure should not be too high to avoid impacting the sensor); focus on cleaning the gap between the scale body and the foundation and the sensor installation position to ensure no foreign objects are stuck; after cleaning, check whether the scale body can shake flexibly (slight shaking is normal; if it is fixed, there may be foreign objects propping it up).
Note: It is forbidden to pile heavy objects on the scale body or strike the scale body to avoid deformation of the scale body; during cleaning, avoid water entering the junction box and sensor interface to prevent short circuits.
Instrument and Wiring: Eliminate "Poor Contact"
Check whether the instrument display screen is clear, the value is stable, and the buttons are sensitive; check whether the junction box and sensor connection lines are damaged, aged, loose, and the interface is firm. If cable damage is found, it should be wrapped with insulating tape or replaced in time to avoid short circuits caused by rainwater and dust entering; if the wiring is loose, it should be re-tightened after power failure (note to make wiring marks to avoid wrong connection).
Note: The instrument should be kept away from strong electromagnetic interference sources (such as frequency converters, electric welders, high-power motors) to avoid value fluctuations caused by electromagnetic interference.
Regular Maintenance: Perform According to Cycles to Care for Core Components Precisely
In addition to daily maintenance, in-depth maintenance should be carried out periodically, which is recommended to be operated by professional and technical personnel (Vishay recommends once every 3-6 months, and shortened to once every 1-3 months in harsh environments), focusing on core parts such as sensors, junction boxes, and foundations.
1. Sensor Maintenance: Protect the "Heart" of the Weighbridge
The sensor is the core load-bearing component of the weighbridge, which directly determines the weighing accuracy. It is most afraid of corrosion, overload and uneven force.
Maintenance Points: ① Check whether the sensor installation base is flat and clean, ensuring that the sensor is in close contact with the base without suspension or inclination; ② Use a multimeter to detect the sensor output signal to judge whether it is normal. If the signal is abnormal, it is necessary to check whether it is a sensor damage or wiring problem; ③ For analog sensors, it is necessary to regularly clean the dust and moisture inside the junction box, and desiccant can be placed in the junction box to prevent terminal oxidation; ④ Avoid long-term overload of the sensor, it is strictly prohibited for vehicles exceeding the maximum weighing value of the weighbridge to get on the scale. Vehicles should get on the scale at low speed and smoothly to avoid sudden braking and sharp turns, reducing the impact on the sensor.
Note: Sensors are precision components. They should be handled with care during disassembly and replacement to avoid collision and falling; standard weights should be used when calibrating sensors to ensure calibration accuracy.
2. Junction Box and Instrument Maintenance: Prevent "Moisture" and "Dust" for Electronic Components
The junction box is the "transfer station" for signal transmission, and the instrument is the "terminal" for data display. Both need to be protected against moisture, dust and interference.
Maintenance Points: ① Open the junction box regularly, wipe the internal terminals with a dry cloth, check whether the terminals are oxidized or rusted. If oxidized, sand them clean with sandpaper and re-wire; ② The instrument needs regular calibration (it is recommended once a month). The calibration process should be operated according to the instrument manual or carried out by professional personnel; ③ The software system of the intelligent weighbridge needs to be updated regularly to clean up redundant data to avoid system lag and errors; ④ When not in use for a long time, turn off the instrument power, unplug the power cord, and do a good job of dustproof coverage.
3. Foundation and Surrounding Environment: Do Not Neglect to Build a Solid "Foundation"
The stability of the weighbridge foundation directly affects the force on the scale body. If the foundation settles or cracks, it will lead to deformation of the scale body and uneven force on the sensor, thereby affecting accuracy.
Maintenance Points: ① Check the foundation regularly for settlement, cracks, water accumulation and other conditions. If there is water accumulation, drain it in time to avoid long-term immersion of the foundation; if there are cracks, contact the construction unit for maintenance and reinforcement; ② Drainage facilities should be set around the weighbridge to avoid rainwater accumulation under the scale body; ③ In winter, timely clean up the ice and snow on the scale body to avoid ice and snow melting and seeping into the foundation, and prevent vehicles from skidding and impacting the scale body when rolling over ice and snow.
Fault Prevention: Do Not Step on These "Pits"
Many weighbridge faults are caused by improper manual operation. Doing the following points can effectively reduce the occurrence of faults:
It is strictly prohibited for vehicles to brake suddenly, make sharp turns or turn around on the scale body to avoid impact deformation of the scale body and damage to the sensor;
It is strictly prohibited to carry out welding and cutting operations on the scale body. High temperature will damage the sensor and cables;
It is strictly prohibited to weigh beyond the range. Long-term overload will lead to permanent damage of the sensor and deformation of the scale body;
Avoid strong electromagnetic interference. Frequency converters, electric welders and other equipment should not be installed around the weighbridge. If it is unavoidable, shielding measures should be taken;
Regularly record weighbridge operation data (such as daily weighing values, calibration results, fault conditions) to facilitate subsequent tracing and problem troubleshooting.
Vishay Warm Reminder: Professional Services are the Backing
Although daily maintenance can solve most problems, when the following situations occur, it is recommended to contact professional and technical personnel in a timely manner (such as Vishay after-sales service team), and do not disassemble or repair by yourself:
1. Severe deviation of weighing values, which cannot be restored after multiple calibrations;
2. Abnormal sensor output signal, unable to judge the cause of the fault;
3. Deformation of the scale body, cracks in welds, settlement and cracks in the foundation;
4. Errors in the intelligent weighbridge software system and failure to operate normally.
As an enterprise deeply engaged in the field of weighing equipment, Vishay has always adhered to the product concept of "accuracy, reliability and long-term effectiveness", and always reminds everyone: the service life and accuracy of a weighbridge depend on 30% equipment and 70% maintenance. Scientific maintenance can not only extend the service life of the weighbridge (under normal maintenance, the service life of the weighbridge can be extended by 3-5 years), but also ensure the accuracy and reliability of weighing data, providing protection for enterprise operations.
I hope this guide can help you. If you have more questions about weighbridge maintenance, calibration and fault troubleshooting, please feel free to contact Vishay. We will provide professional technology and considerate services to protect the operation of your weighbridge!
