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886results about "Weighing apparatus testing/calibration" patented technology

Weighing method of electronic belt conveyor scale capable of checking automatically

The invention relates to a weighing method for an electronic belt scale capable of self-check, more than two weighing carrier rollers (3) form into a weighing device of the electronic belt scale, each weighing carrier roller is supported by more than two weighing sensors (5), each weighting sensor is respectively connected with a PLC (7) through an individual signal transmission line (8), the PLC can directly acquire an output weighing signal of each weighing sensor to monitor and diagnose each weighing carrier roller and weighing sensor on real-time in the weighing process. During a normal weighing, the method measures according to a multiple carrier roller mode. The PLC monitors, recognizes, diagnoses, groups and compares the weight signals after A/D transition on real-time, and calculates the material weight after integral arithmetic with speed signals of a motor or the belt. During thediagnosis, the weighing device treat according to more than two single carrier roller manners, and each weighing carrier roller is measuring cup for each other. The invention has strong ability of disturbance resistance, and can find out failures such as poor measuring accuracy, damaged weighing sensor, etc., the performance is stable and reliable, the failure point can be quickly checked out so as to be maintained conveniently, the maintenance capacity and component replacement quantity are in a small quantity.

Calibration device of large weighing apparatus

The invention provides a calibration device of a large weighing apparatus. The calibration device comprises calibration units and a base, wherein the number of the calibration unit is at least accordant with that of weighing sensors of the calibrated weighing apparatus; the base is used for supporting each calibration unit; a foundation pit used for accommodating the calibrated weighing apparatus is arranged on the base; base pre-burying boards are respectively arranged on the bases which are arranged on the two sides of the foundation pit; each calibration unit comprises a pedestal fixedly arranged on the base pre-burying boards, a force applying oil cylinder, a cantilever beam with a fixed end and a free end, a force sensor and a ball head pressing block; a bearing board is arranged on a weighing platform of the calibrated weighing apparatus; the force sensor is arranged on a piston of the force applying oil cylinder; the fixed end of the cantilever beam is fixedly arranged on the pedestal; and the free end of the cantilever beam is positioned above a ball head bearing pad and is contacted with the ball head bearing pad. The calibration device has the advantages that the working efficiency and the security of the large weighing apparatus are highly improved, the cost is saved and the structure is simple.


WEIGHNTEL is a weighing device, a scale that is capable of automatic instantaneous wireless transmission of recorded weights that are packaged or associated with other data as identification, date, and time. This is wireless transmission of a recorded weight and other business related data, of objects including living beings, to any location on earth or in outer space. Using existing technology a scale can be manufactured to accomplish electronic transmission of weights after recording them with account ID, date and time on a computer disc. Digital scales may be used and preferred over other traditional scales. Objects to be weighed vary from tiny objects such as jewelry, postal items, to human beings, pets and animals, cargo in seaports, airports, and rail stations or to be loaded on commercial or military trucks or other transportation vehicles. Weighing cargo in this innovative manner can help to safeguard against illegal interventions over time or space. Weighing human beings can help to generate a more accurate and meaningful weight record, or weight history from birth to end of life, or from any point of beginning to termination of the account. Adding a global locator feature could be of unimaginable security value especially if the devices are globally marketed. Adding a camera or video camera would perhaps be a luxury that increases the cost of production but also enhances security. Adding sensors such as a scanning device can help to pick a unit ID and include it with data to be transferred. The device could be programmed to make automatic corrections to weights that are influenced by geography in locations that alter the gravity effect. [e.g. a weight on earth is 6 times that on the moon]. Either the transmitter and receiver ends can be portable mobile or they can be stationary i.e. a scale can be small and portable or huge and fixed to a location. A receiver can be a portable hand held device, a telephone or a stationary computer or a laptop. Transmission is basically performed by an electronic transmission device in a manner similar to TCP/IP packet transmission or email transmission between two ends or computers. Wireless data transmission happens from scale to a location on the Internet, Intranet or any receiver device and vice versa using end to end wireless data transmission protocol. Every transmitting device within a scale is programmed for a specific goal that is defined by the type of business involved. Every receiver device and each software program is built for a specific goal that is defined by the type of business involved. At the receiver end transmitted data are automatically entered into the account ID file. Data are further processed to produce a graph or a table or both showing the details of the transaction and relation to prior transactions. A printable file shows weight progress from the date of subscription to the account to the date of the last transaction. With each transaction a new updated file is produced without deleting previous records.

Method and system for checking precision of electronic belt scale

InactiveCN102175297AOvercome the problem that only the accuracy check can be performed but the accuracy check cannot be performedConvenient accuracy check methodWeighing apparatus testing/calibrationComputer scienceTraffic volume
The invention provides a method and system for checking precision of an electronic belt scale. The method comprises the following steps: in the process of balancing the scale with a standard code, collecting data containing scale frame length and weight and a belt speed by each electronic belt scale according to the principle of intra-group instant sampling and inter-group multiple sampling; according to the collected data and a preset flow of each feeding device, calculating basic data Y required by the precision check according to the following formula; calculating the ratio of an intra-group range average value to an inter-group range average value of the basic data; and comparing the calculated ratio with a preset threshold value so as to determine whether to repeat the precision check or end the precision check, wherein the formula is that Y=1-sigma{[(the actual flow i/the preset flow i-1)2]1/2*( the preset flow/a preset total flow)}*100%. By using the method, the existing problem that an enterprise can only check the accuracy of the online electronic belt scale but cannot check the precision is solved. The invention provides a convenient method for checking precision.

Tracking testing system of resonant frequency of quartz crystal microbalance and method thereof

The invention discloses a tracking testing system of the resonant frequency of a quartz crystal microbalance and a method thereof, the tracking testing system comprises an analog circuit testing network and is characterized in that the tracking testing system further comprises a digital frequency synthesizer, a homologous frequency multiplication signal generation module, a high-speed analog-digital converter ADC, a signal processing module and a feedback tracking module, wherein the high-speed analog-digital converter ADC is used for generating a frequency multiplication signal which is homologous with a driving signal and has the frequency of 4/(2N plus 1); a voltage signal outputted by a sampling module is amplified by an operational amplifier and then directly enters into the high-speed analog-digital converter ADC for carrying out conversion and output; the signal processing module is used for calculating the serial complex admittance of a QCM chip according to Kirchhoff laws, and approximately calculating the difference between the current frequency and the series resonant frequency of the QCM and the serial impedance of the chip; and the feedback tracking module is used for changing the output frequency of the digital frequency synthesizer, leading the output frequency to approximate the serial resonant frequency of the QCM, and repeating the implementation for realizing the tracking of the serial resonant frequency of the QCM.

Method for self-testing of electronic belt weighing in real-time and online way

The present invention discloses a method for the self-testing of electronic belt weighing in a real-time and online way. A real-time online self-testing device is employed in implementation, the self-testing device comprises a PLC, a weighing type pressure material level meter arranged on a storage bin and an electronic belt scale under the storage bin. The electronic belt scale comprises an electronic belt and a weighing instrument arranged in the electronic belt. The method comprises the following steps that when the storage bin is not fed, the weighing type pressure material level meter detects the weight change signal of the material in the material bin in the process of outputting the material, the material conveying amount signal of the electronic belt scale is detected through the weighing instrument arranged in the electronic belt, through transmitting the weighing value of the material weight change signal in the storage bin and the weighing value of material conveying amount signal of the electronic belt scale to the PLC respectively, whether the weighing transmission of the electronic belt scale is in a correct accuracy range is judged. According to the method, the electronic belt scale weighing accuracy can be monitored in an online and real-time way and improved.
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