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Author: Smartweigh–Multihead Weighter
The automatic batching system software is a very important control, measurement and detection system in the forming process of the company's carbon factory, which has a huge impact on the quality of the products produced and processed by anodizing in the carbon factory. Scale composition (introduce the name). According to the serious study, social practice activities and scientific research of the three multihead weighers, I have some superficial understanding and mastery of the multihead weighers. Here is the key to make a simple and detailed measurement of the basic concepts and calculation methods of the three multihead weighers. Introduce and work hard with everyone. The first structural composition.
In general, multihead weigher is composed of core components such as feeding sluice, weighing bucket, stirring device, feeding machine equipment, rack, load cell and measuring and testing actual operation equipment. Two weighing hoppers. Weighing hopper is the installation of raw materials in raw material weighing. The selection of raw material models should take into account corrosion resistance and acid resistance. The weighing volume of raw materials is selected according to the total output of feeding in 3 minutes, and the feeding time should account for the entire weighing process. 10% or so.
The third is mixing machinery. The stirring device is mainly used to assist the feeding of raw materials with poor fluidity. It is generally composed of a drive motor of an arch-breaking arm containing a spiral auger blade or nail teeth. The raw material of the hole falls smoothly into the entrance and exit. 4. Feed equipment.
The transportation equipment is used to transport chemical fiber raw materials in the weighing balance scale. According to the characteristics of the raw materials to be transported and the geographical environment of the application, screw conveyors, centrifugal impeller conveyors, and transmission belt conveyors can be used. In most cases, screw conveyors are stronger than other closed feeding machines and can not only transport raw materials evenly, but also prevent splashing and gushing of powdered raw materials. The fifth is the external sound card support frame.
The sound sensor structure is the support point body of other mechanical equipment and machine equipment, and the load cell is installed on it. 6. Weighing sensor Net weight is an important weighing component of multihead weigher. It selects high-resolution resistance strain gauge sensor, which converts the net weight signal of raw materials into electronic device data signal for output. 7. Measurement and testing of control equipment.
The measurement and control equipment is composed of an intelligent multihead weigher dial and an automatic automatic control system, which is used to control and measure the transportation rate of raw materials and transportation capacity. In addition, the feeding port and feeding port of the multihead weigher should generally choose soft dirt-resistant follow-through and sealing conductive conductive soft connections to ensure that the connection between the storage bin and the subsequent equipment is not easy to hinder the weighing. The heavy hopper is a multihead weigher, and the adjustable feeder is mounted on a load cell that is fixed to the frame.
Second, the standard. First, the standard. Metrological testing is based on the basic concept of controlling net weight hazards throughout the work process.
First, weigh the cutting machine equipment and weighing hopper, set the actual cutting speed according to the damage of the net weight per unit time, and then control the cutting machine equipment to make the actual cutting speed. The control parameters are precise and consistent, and in a short period of time, the cutting machine equipment uses the interaction force during the entire cutting process to make the control signals stored in the middle and later stages of the work work according to the basic concept of volume. The second is the weighing of the whole process. The net weight of the raw materials in the weighing hopper is converted into electronic devices according to the weight of the sensor, and the data is wirelessly transmitted to the multihead weigher case. In contrast, according to the PLC control of the feeding water gate, the weighing hopper is cut off.
In addition, the instrument panel in the weighing vehicle compares the accurately measured actual feeding rate (opening flow) with the preset feeding rate, and uses PID adjustment to carry out the actual operation of the feeding machinery and equipment, so that the actual feeding rate can be adjusted. The feed rate precisely tracks the pre-set value. When the feeding water gate is opened to feed into the weighing hopper, the control data signal locks the feeding rate, and starts volumetric feeding. The multihead weigher case displays the information content of the incoming and outgoing materials, displays the actual rate of the incoming and outgoing materials, and Displays information about the total net weight of ingredients. The third is the accurate measurement of the feeding rate.
The feeding rate (opening flow) of the multihead weigher is the net weight damage value per unit time, which is theoretically calculated by the formula mt=dG/dt. The larger the cutting speed; the net damage value, i.e. dG precisely measures the period dt. The multihead weigher can accurately measure the pass rate by pressing and holding under the displayed condition.
mt=n(d±β*d1)/(t±t) The formula is being calculated. The d-multihead weigher dial shows the range. n-Display information indicates the number of scaled transitions of the information content.
D1- The screen resolution of the inner screen of the instrument panel in the weighing vehicle is the measurement error index value, which is generally indicated by β=O.6. TD - precise measurement of circulatory system time. Te - the index value of the reason for recording errors during recording, generally te=0.001.
4. Calculate the total weight. The total net weight Gq in the total cycle time of the multihead weigher consists of two parts, namely the multihead weigher case measurement test and the multihead weigher dial net weight VA, and the multihead weigher dial case net weight V that is not measured at the previous stage. . gq=va+VD product=(product+product)-(product-product)-0CD=MTL*TF formula calculation.
VH- The upper limit value of the net weight before weighing the warehouse stock. Seasoning - Net seasoning lower limit value in the weighing bin. $H - limit value on net weight due to weighing error.
The net weight is less than the specified value due to the error caused by the weighing. MTL - Locked feed rate during the feed period. TF - estimated time.
The locked feed rate MTL is still displayed in net weight per second K transitions The range shows: mtl=K(d±β*d1)/(1±te) Feeding time Feeding water gate feeding flow MF, MF=10MT. The actual total period of TF=VA/MF is: TE=TF+TD. The average flow rate is: mq=gq/tn In each cycle system time, the net weight of the raw material is continuously totaled, and the total tn net weight at the time t=0 can be accurately measured.
Fifth, results. In other various weighing equipment and machines, due to the bonding of raw materials, the temperature conversion of the load cell causes the tare weight to change, thereby reducing the precision of the system, but the multihead weigher gets rid of such defects, and it is difficult to Conversion to reduce weighing accuracy. The reason is very simple, the accurate measurement of the feeding rate of the multihead weigher is based on the net weight difference, not the net weight difference, so the multihead weigher has a very broad application prospect in the chemical fiber raw material transportation system.
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