The calibration system for liquid and solid weighing and measuring tanks composed of loaders (tanks, storage tanks, reactors and other tanks), Weighing modules, weighing instruments, etc. currently uses standard weights to calibrate the weighing and measuring tanks. As the weighing and measuring tank belongs to the online operation of equipment, must be calibrated online, no large area carrier (tank) platform or space to stack standard weights, can not be calibrated full range, and time-consuming and laborious, as well as by the environment and other objective conditions, can not accurately and reliably reflect the measurement of performance. For this reason, the development of new measurement standard devices to carry out calibration of weighing and measuring tanks, unified weighing and measuring tanks of technical indicators, strengthen supervision and management.

The standard loading device is evenly distributed in the carrier (tank), and connected to the base plate and special force frame, and at the same time connected to the control system. Hydraulic pump will pressure from the pressure divider synchronized input cylinder, weighing control system to control the force to ensure that the force of balanced loading, and to maintain the stability of the loading, load cell by the force, through the weight indicator to read the data. In order to achieve the same standard load value given by multiple standard loading device units, the signal is fed back to the microcontroller in real time by using the metering module, and the multiple standard loading device units work in synchronization, adopting the microcontroller technology, collecting the multiple AD values, calculating and converting them into digital signals, and displaying them in the weighing instrument through 485 serial communication, and inputting commands to control the hydraulic cylinders of each road according to the force state of the standard loading device units, so as to achieve the load balance of each standard loading device unit. According to the force state of each standard loading device unit, the command is input to control the hydraulic cylinders of each circuit, so as to realize the uniform and synchronized operation of each standard loading device unit.

The hydraulic system is controlled by the linear movement of the hydraulic cylinders, thus eliminating the gap of the whole mechanism of the standard loading device unit to gradually transfer the load to the weighing module at the bottom of the weighing and measuring tank, and displaying the quantity and value through the supporting weighing instrument, the hydraulic cylinders can move linearly in both directions to realize the loading and unloading of the weighing and measuring tank.

The digital weighing module as the core unit is used as a standard loading device to test the metrological characteristics of the weighing tanks in conjunction with the loading fixtures. The calibration of the weighing tank uses the standard loading device as the calibration standard. The standard loading device consists of a load cell with C4 accuracy and related fixtures.

The error of the reproduced mass value of the standard loading device should be no more than 1/3 of the permissible error of the corresponding load of the calibrated weighing and measuring tank, and its short-term stability should be no more than ±0.01%/30s. Installation requirements of the standard loading device and the special force frame: the pre-embedded parts should be kept at a level, and the deviation of the level should be less than 1°; the deviation of the pre-embedded parts from the leveling of the ground plane should be less than 2mm; all the special force frames should be at the same level, and the difference in height should be less than 2mm; the difference in height should be less than 2mm. The height difference is less than 2mm; the installation verticality of the standard loading device (on the ground) should be kept vertical, and the deviation should be less than 1°.

Selection of weighing points: According to the maximum calibration load of the tank, select the following load points for calibration: 25% maximum calibration load, 50% maximum calibration load, 75% maximum calibration load, maximum calibration load, or select the calibration load points according to the user's requirements.

Under repeatability conditions, a set of measurements shall be made in a practically consistent manner with a calibration load close to 50% maximum calibration load, and the readings shall be taken when the tank is loaded and has reached stability. The test load test points may be adjusted if the user has special needs. The load shall be unloaded to zero prior to each loading and loaded after the tank reading has stabilized. Set the tank indication to zero before measurement. Load the test load at least 6 times. Record the indicated value each time the load is loaded. After each unloading during the measurement, check the displayed value. If the display is not zero, it can be set to zero.

Reactor weighing objective conditions of defects, through research and analysis of the principle structure of weighing measuring tanks, the main technical parameters and weighing methods, the use of standard loading device to apply the standard load system design, to achieve the detection and calibration of weighing measuring tanks, and for the drafting of the "weighing tanks calibration specifications for the Weighing system" to lay the foundation for the promotion of weighing tanks traceability normative and standardized, and weighing tanks to strengthen supervision and management. The company has also been guiding the standardization and testing of weighing and measuring tanks.