Device points (device bolts)
The sensor of the device is fastened with high-strength bolts of the specified grade. (8.8, 10.9, etc.).
For sensors that require a gasket for the device, a washer must be placed on the bolt before it can be installed.
Bolt fastening method:
– Pre-tighten, then tighten (2 bolts).
- Preload diagonally first, then diagonally (more than 2 bolts).
Before tightening the bolts, a small amount of butter should be applied to avoid rust on the bolts and facilitate disassembly and assembly.
Failure Hazard:
-The sensor fastening screw is stretched and deformed, the measurement is not accurate, and the repeatability is poor.
- Metering accuracy decreases.
-The force on the device surface is uneven.
-It is inconvenient to disassemble and replace the sensor.
It is forbidden to install less fastening bolts when installing sensors.
The bolt should be screwed into the base at a depth ≥ 1.5 times the diameter of the bolt thread (the base is threaded)
The length of the bolt should be ≥ Sensor height + base height + nut height (the base is not threaded, the nut is connected)
Failure Hazard:
-Weighing data moves slowly, metering accuracy decreases, bolts, sensors are shortened, and even safety accidents may occur
-The threads of the screw can stretch, deform, and possibly even cause a safety accident.
The sensor device surface and the device base should be kept level and not skewed.
The horizontal difference between the mutual device surfaces in the multi-load cell weighing system is less than 5 mm, which can be relaxed if the system measurement accuracy is low (5/1000).
The sensor device surface should be kept flat and clean, and there should be no adhesive film, burrs, sharp points, etc. on the device surface.
Failure Hazard:
-Torque is generated by the sensor, which causes inaccurate metering and wear on the surface of the bearing hole and connector.
-The angle difference is difficult to adjust, and the repeatability is not good.
- The metering accuracy of the sensor decreases.
The base of the device surface should be strong and maintain a certain thickness.
-In general, when the base of the device is welded to the bottom, the thickness of the base > more than twice the diameter of the bolt thread.
Bottom welding
-In general, when the base of the device is welded with both ends, the thickness of the base > more than 1.5 times the height of the sensor.
Face welding
The base area of the device surface should be larger than the load cell device area.
Failure Hazard:
-The base of the device can be tortuous, inaccurate in measurement, and may even lead to safety accidents.
- The metering accuracy of the sensor decreases.
When installing and replacing the sensor, it is necessary to select the appropriate torque wrench and adjust it to the torque requirements of the sensor tightening.
Failure Hazard:
-The torque is too loose, resulting in inaccurate measurement and poor repeatability of the sensor.
-The torque is too tight, which causes the sensor fastening screw to stretch and deform, and the tightening effect cannot be achieved.
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