Weighing the weight of the railway cargo vehicle . There are three types of static track scales, dynamic track scales and light track scales . Widely used in the weighing of bulk cargo for trucks in factories, mines, metallurgy, foreign trade and railways.
First, the composition and working principle of static electronic railway scale
1. Composition of static electronic railway scale
The general static electronic railway scale consists of weighing table tops and sensors , electrical instruments, computers, printers and so on. The digital sensor belongs to the power conversion component, that is, the sensor can output digital signals under the influence of the gravity of the vehicle, and is directly transmitted to a dedicated meter or computer through the 232 standard interface.
When a vehicle stops on the weighing platform, the computer reads the sensor's signal for data processing and calculates the weight of the vehicle. When a train is weighed, the operator can report the report through the printer.
2. How static orbital works
The static electronic railway scale produced by our unit is 13000mm or 14000mm static electronic railway scale for the whole vehicle measurement. When the vehicle body passes through the weighing platform, the weighing platform transmits the force to the force-electric conversion component sensor, and the sensor is deformed to output an analog signal proportional to the weight of the vehicle body. These weight signals are amplified and AD converted by a dedicated instrument. The digital signal is sent to the computer through serial communication, and the computer analyzes and discriminates to distinguish the valid data and correctly measure and display.
Second, the characteristics of my unit static track scale
Scale platform
The mechanical weighing platform of our unit is transported separately, and needs to be assembled on site. It consists of a scale body, a load cell connection system, a limit system and a protective cover.
The weighing platform is connected by two main beams (ie, the weighing beam) through the beam into an integral frame structure. The main beam is welded to a box structure with a steel having sufficient strength and rigidity. The contact surface of the scale beam and the rail is processed by one-time processing, which has high installation precision and is used for the smooth running of the carrying vehicle.
The weighing platform uses the sensor connection system as a support point. The sensor connection system has the function of adjusting the height of the sensor support, which can realize the adjustment of the installation position and height of the sensor. After adjustment, the sensor is in a good stress state to ensure the realization of the overall weighing accuracy. .
The steady state of the weighing platform is guaranteed by the longitudinal and lateral limit systems. The limit system adopts the structure of the small gap ejector mode to ensure the physical position of the scale body in the horizontal and vertical directions.
A weighing platform cover is laid in the middle of the weighing platform, and the foundation cover is laid on both sides to protect.
2. Weighing sensor
The main core component of the scale is the sensor. We use the QS bridge digital sensor manufactured by Ningbo Keli Company. The sensor introduces gravity into point contact instead of ordinary. It adopts steel ball rolling support and has strong self-reset. Performance, strong lateral impact resistance. It is the first choice for static railway scales. It has high precision and wide operating temperature range (-45～+85°C) with good consistency. Due to the use of digital technology, it has the characteristics of high precision, strong anti-interference ability, long transmission distance, and replacement-free calibration.
The main parameters of the static rail scale sensor are as follows:
Model: QS-D40T
Rated capacity: 40t
Data refresh rate: 200 times / sec
Data transmission rate: 9600-38400BPS
Digital module A / D code: 10 million yards
Digital sensor zui large output: 60000 yards
Sensor comprehensive accuracy: <±0.02%
Sensor temperature coefficient: <±0.02%/10°C
Zero output: <±0.1%
Input impedance: 750±10Ω
Output impedance: 702 ± 5Ω
Operating temperature range: -40 to +80 ° C
Recommended excitation voltage: 9 ~ 12VDC
Zui large excitation voltage: 25VDC
Safety overload: 150%
Safety protection: built-in overvoltage protection
Sealing grade: alloy steel material, laser welding IP68
Zui transmission distance: 1200 meters
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