First, the electronic vehicle scale cheating methods: 1 The weighing sensor to the meter's electronic circuit private access to illegal devices, to achieve the purpose of measuring cheating; 2, the measurement of vehicles to take the heavy trailer, cycling back to the means to achieve increased net weight Objectives; 3, with the vehicle being loaded to the loss of objects (such as water) in the return weight when the water will be drained, more people sit in the cab, when the weight is back to sit more people do not get on the train to achieve the purpose of raising the net weight. 4. With the increase in the length of the vehicle, the length of the scale body is also increasing, making it difficult for the surveyor to observe the measurement position of the vehicle on the scale. It is easy for the unscrupulous to drill holes, use the pressure scale, and not complete. Scales and other means of cheat; 5, the measurement staff by the threat of illegal elements or incentives, in the micro-computer weighing and confirming links, change the weighing results. If these cheating situations are not discovered in time, they will cause huge economic losses to the company.
Second, the electronic truck scale electronic cheating device principle The device's working principle is in the load cell internal measurement circuit output / input signal cable in series resistance, causing the output signal to reduce, in order to reduce or increase the weight of the purpose. According to the cheating phenomenon discovered by the author in recent years, the general cheating device is installed in the signal cable, weighing indicator and junction box of the load cell. The following focuses on the installation of the theft device in the load cell signal cable for cheating. When the electronic truck scale is installed, the signal cables of a number of outdoor load cells are connected to the junction box through the threading pipe, but there is still a part of the signal cable exposed. This small signal cable gives some unscrupulous elements an opportunity. Driven by profit, they will look for an opportunity to peel off one of the load cell signal cables and disconnect the positive (+EX) line of the load cell's excitation voltage. If the sensor is a six-wire connection, it will also be disconnected. Feedback voltage is positive (+F) line. After disconnection, remote control receiver is connected in series with positive (+EX) line of excitation voltage. At the scene we also found that the receiving device was connected in series with the signal line (+Si or -Si). After the cheating device is installed, it will not affect the normal use of the electronic truck scale. Only when the criminals open the remote control remotely within tens of meters of the scale body, the receiver will receive a signal and the relay will move. The resistor is connected in series with the positive (+EX) or the signal (+Si or -Si) line of the excitation voltage, resulting in a reduction or increase in the supply voltage of the load cell Wheatstone bridge, or in series with the resistance of the signal line. The millivolt-level electrical signal is reduced or increased, which ultimately results in a reduction or increase in the weight of the truck scale. This kind of theft method is highly concealed, easy to operate and difficult to detect. The remote control device is installed in the weighing display instrument, usually added to the instrument before A/D conversion, and the weight value of the weighing instrument is adjusted by remotely changing the resistance value.
Third, the electronic vehicle scale cheating method Electronic truck scale anti-cheat theft device not only reduce or increase the weight, bring economic losses to the company; some theft device due to its own quality or installation problems often lead to weighing system failure and can not be Normally weighed. In order to safeguard the legitimate interests of enterprises, reduce unnecessary economic losses, and not give unscrupulous elements an opportunity to take advantage of them, companies can take effective measures to eliminate illegal use of remote control devices for cheating. In addition to strengthening management and improving accountability, how can we prevent electronic cheating? Here are some preventive measures I have accumulated over the years: For your reference.
1. Focus on the protection of the exposed sensor cable. When the load cell of the electronic truck scale is installed, the signal cable is connected to the junction box through the threading pipe, but there is still a small part exposed outside the threading pipe. The criminals use this part of the bare cable to peel the cover and install the remote control. The device is cheating.
2. Always check the easy-to-handle parts. Always inspect the exposed lines of the sensors for exposed skin, short-circuit shorts, or artificial damage. Always check if the sensor ball is loose and if the embedded mat is collapsed or deformed. Change, therefore, we can consider the use of plastic hose or stainless steel hose between the load cell and the threading tube for protection. At the end of the load cell, the joint is made with a wire joint, and the metal threading tube is also threaded at one end to prevent The signal cable is exposed and the remote control is broken. Always check whether the monitor has been opened, the technical supervision department has verified that the seal or qualified seal is intact, the seal is regarded as an unqualified measuring instrument after verification of the seal or the damage of the qualified seal, and the disabled personnel are prohibited from entering the pound room and the pound person is out. Into the lock door, strict prevention.
3, install electronic truck scale anti-cheating device, when the criminals use the remote control remote cheating device start can be alarmed in time, on the scene to capture criminals. Install infrared camera. When the vehicle is not completely on the carrier, it will promptly report an alarm and timely correct it.
4, in the weighing process often observe the display shows whether the value of the phenomenon of flickering, after the end of the display is quickly returned to the display and stability, not weighing the display stability is no value drift phenomenon, if more than In similar situations, contact the Metrological Verification Department or professionals quickly to eliminate alien conditions.
5. Strictly manage and rigorously train the staff. The final result of measurement is still derived by the surveyor, so that the most important part of the measurement has the same drawbacks as the traditional measurement methods, and the measurement results are easily affected by humans. The metering staff may be driven by economic interests to assist illegal people in cheating during the weighing process. Add security measures to pound rooms, and conduct uninterrupted patrols at night. If necessary, install monitoring devices inside and outside the house to monitor the outside of the pound room and to deter lawbreakers from touching the carrier. You can also monitor the working status of the pounds. .
6, using digital truck scale, digital truck scale using digital weighing display instruments and digital load cells, the signal transmission using digital communications technology, bus structure, RS485 interface to achieve long-distance signal transmission. Because the load cell adopts digital signal transmission, and the digital signal transmission is performed according to different communication protocols prescribed by different manufacturers, to cheat on the signal transmission of the digital load cell, the communication protocol of the manufacturer's digital load cell must be deciphered. It is possible, therefore, the possibility of cheating on digital truck scales is very small. At present, some manufacturers of weighing indicator can detect the digital sensor signal in real time, with anti-cheating function.
The application scope of packaging machinery is very wide, providing quantitative packaging for industries including grain, fertilizer, chemical industry, etc.The new dual display instrument has high measurement precision and stable performance, can display the accumulated weight, package quantity, and is more simple and convenient to operate. Equipped with adaptive software, it has the functions of automatic setting of control parameters, automatic correction of fall, over-tolerance alarm, and self-diagnosis of faults. The quantitative range is wide, the precision is high, and the machine is multi-purpose and high in efficiency with a conveying sewing machine with a lifting table top.
DCS-A Series Technical Parameter
Model
DCS-1
DCS-5
DCS-25
DCS-50
DCS-100
Packing Range
0.2-1kg
1-5kg
2.5-25kg
5-50kg
10-100kg
Packing Error
0.2%F.S
0.2%F.S
0.1%F.S
0.1%F.S
0.1%F.S
Dividing Value
2g
5g
10g
20g
20g
Packing Speed
300-500/H
300-500/H
300-420/H
≥300/H
≥300/H
Power&Air Supply
AC22OV 50Hz 0.4-0.8MPa
External Dimensions
1725*620*710(mm)
1890*620*710(mm)
2450*650*715(mm)
2560*-650*715(mm)
2960*730*775(mm)
Actuator
Pneumatics
Precision Grade
×(0.2) ×(0.1)
DCS-A Series Packing Machine,Vertical Packing Machine,Food Packing Machine,Carton Packing Machine
Sichuan Doujin Technology Co., Ltd. , http://www.doujinmachine.com