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Material weight detection (2)
Second, driving electronic scales
The driving electronic scale is weighed in the left and right movement of the driving or moving in the front and rear of the trolley. It requires the sensor to have good structural strength, high sensitivity, and anti-lateral force, anti-impact and anti-vibration performance, in order to ensure the stability and reliability of the driving electronic scale, but It is not yet possible to meet all of these requirements. The driving electronic scale is also composed of different types of indenters and corresponding secondary instruments. When the weighing signal on the vehicle needs to be transmitted to the workshop duty room or control room, the appropriate remote meter should be equipped.
1. The assembly part of the indenter
It is extremely relevant to the position of the indenter on the precision of the head of the driving electronic scale and the ease of use. The indenter can be installed under the axle of the trolley, the shaft of the rope drum, the beam of the hook and the axle of the fixed pulley. However, it is required to reflect the weight change sensitively, and it is not affected by the horizontal component force when the vehicle or the trolley moves as much as possible. Figure 6 is a schematic view of several assembling manners of the indenter. In the figure, a is to fix the wire rope on the movable pulley 3 at an appropriate position, and a tensile member 5 is installed in the middle, and the indenter 1 is installed in the stretching member, when the steel wire is subjected to the load. When the head is pressed, the tension is felt. In the figure, b is to raise the position of the fixed pulley 2 to an appropriate position, and the pressure head is felt under the fixed pulley shaft to feel the weight forming pressure. In the figure, C is under the fixed pulley of the main winder, and each of the pulley frames is equipped with an indenter to feel the change of weight. In the figure, d is to hang the tensile member on a fixed pulley or other suitable part. The wire rope passes through the three inclined directional small wheels 4. When the weight is received, the ram is subjected to a torsional moment. This method has a pressure head and needs to replace the wire rope. The wheel set is convenient, but these methods can not overcome the influence of the horizontal component force when the car or the car moves, and the weight must be read after the car or the car is stopped. Properly transform the fixed pulley block of the trolley, and install the annular indenter under the fixed pulley block. Since the annular indenter is mounted on the elastic bracket and has a spring plate in the horizontal direction to balance the horizontal component, the movement of the carriage and the trolley can be reduced. influences.
Figure 6 Â Several assembly methods for driving electronic scale indenter
1. indenter; 2. fixed pulley; 3. moving pulley; 4. oriented small wheel; 5. tensile member
2. Display meter
The display instrument of the driving electronic scale generally adopts various digital voltmeters with a range of 0~20 millivolts and an accuracy of ±0.05%, but the range adjustment should be carried out in conjunction with the weighing range of the electronic scale, and the zero position is carried out according to the weight of the wire rope and the tare weight of the container. The adjustment and adjustment methods are the same as described above.
The number of driving electronic scales needs to be large and eye-catching. The general digital tube is too small and can only be used in the instrument room for monitoring operations. Although the sound can be applied to a large-scale point-light combination font, a projection light combination font or a neon tube combination font, but the power consumption is too large, and the size of the drive relay is large, which is not suitable. It is better to use plasma gas to illuminate large digital display or to use electroluminescence large digital display. The power consumption is small, and the non-contact switch can be used as the driving circuit. The writing is also large and clear, but the brightness is slightly smaller. The weighing signal outputted by the electronic scale mounted on the vehicle can be transmitted to the instrument room or control room of the workshop by using a wired digital transmission machine or a wireless data transmission machine. [next]
Third, fixed value electronic scale
The fixed value electronic scale is used for charging and the fixed value control of the weighing process. If it is matched with the program control device, it can automatically weigh and mix various materials. The working principle of the fixed-value electronic scale is as shown in block 7. The feeding amount of the trough is converted into the voltage signal of the output of the detection bridge, which is sent to the comparison unit and compared with the given value of the material. The difference is compared by comparison. After the unit output is sent to the signal amplifier to amplify to a sufficient level, the fixed value controller sends a “zero value†signal, and controls the opening and closing of the trough and other equipment of the loading system to display the weighing amount of the meter. Display or accumulation, the oscillator generates an AC voltage of 500 Hz and 6 volts, and supplies current to the indenter, comparison unit, and display meter.
The comparison unit is mainly composed of a detection bridge (indenter), an inductive voltage divider and a zeroing bridge, as shown in FIG. In the figure, the detection bridge is made up of four bridges in series, indicating that four indenters are used. Therefore, the output voltage of the bridge is ΔU. The sum of the output voltages of the four indenters. In the figure, W 3 is a bridge resistance balance potentiometer, and W 4 is a phase balance potentiometer for adjusting the zero position of the bridge.
Figure 7 Block diagram of the fixed value electronic scale
1. trough; 2. indenter; 3. comparison unit; 4. signal amplifier;
5. Fixed value controller; 6. Display instrument; 7. Oscillator
Figure 8 value electronic scale comparison unit principle line