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The Build-up force calibration machine uses a group of standard dynamometer with higher accuracy than the calibrated ones as the standard. It is connected in series with the calibrated dynamometer.
Before the Build-up force calibration machine is operated, the high-precision standard sensor and the supporting instrument are scaled, and then assembled in the main frame of the superimposed force standard machine, and the calibration value is input into the computer as the set value. After the operation starts, the servo motor starts to drive the oil pump to pressurize the cylinder, the servo cylinder piston moves to supply the oil, the standard sensor and the calibrated sensor are simultaneously stressed, and the sensor output signals are sent to the computer by the standard dynamometer and the calibrated dynamometer respectively, and the computer calculates the difference between the standard sensor output signal (load value) and the set value, and the error of the calibrated sensor is calculated according to the standard algorithm.
Calibration of dynamometers, sensors or equivalent instruments.
1. The machine is installed in the trolley and the platen with a 5000kN standard sensor to reduce the space height, push and pull the mobile trolley to facilitate installation and ensure accuracy;
2. The load of the force value is supplied by two sets of oil pumps, the servo motor drives the ball screw to load the oil cylinder, and the large flow oil pump satisfies the piston lifting speed, which is convenient for space adjustment, and the servo motor makes the control more precise;
4. Self-developed measurement and control software, fully automatic control of loading and unloading, automatic acquisition of measured sensor data, processing and printing;
5. Creep verification function with sensor
|Test space (length × width × height mm)||300×300×800|
|Loading time for each stage||4-30s|
|Force retention time||30s|
|Frame seat and compression platform level||0.3mm/m|
|Dimension (Length x Width x Height mm)||1800×1200×3200|
The system is automatically controlled by the self-adaptive PID control algorithm. When the system is in no load, the displacement sensor feedback signal is used to control (displacement closed loop). When the system is under force, the force sensor feedback signal is controlled (force closed loop).
The all-digital servo (closed loop) control system consisting of computer, reference sensor and EDC-i20, according to the verification force value set by the calibrated sensor, the force-applying device is designed to be composed of two parts: a rapid loading device and a precision loading device. By controlling the large displacement (hydraulic pressure), about 90% of the setpoint force value is applied, and the precise control of the force value is achieved by controlling the micro-displacement (or
micro-hydraulic). The rapid loading system adopts hydraulic servo control transmission mode to apply load to the load measuring system, and the precision loading system adopts micro hydraulic servo control transmission mode to apply load to the load measuring system, and automatically controls the machine to complete cyclic verification of loading and unloading at all levels. Through computer processing of data files, according to the verification procedure, the curve of loading process can be displayed in real time (force-time curve).