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Author: Smartweigh–Multihead Weighter
What is a multihead weigher? What is the basic principle of electronic product multihead weigher? A multihead weigher is also a type of electronic scale that is weighed by electronic devices. In the production process of some manufacturing plants, multihead weigher also has a certain market share and a unique scope of application in his market sales. The multihead weigher is a continuous feeding weighing device.
The actual operation in the weightless state is carried out in the silo, which can achieve higher feeding linearity. The whole process of the electronic weighing system is explained, the silo is a sealed structure, and the environmental protection has zero pollution. It is widely used in the transportation, measurement and inspection of granular and powdery raw materials such as iron and steel industry, building materials decoration, etc.
What is the basic principle of electronic product multihead weigher? The basic concept of the electronic system multihead weigher measurement and inspection is to screw the weighing bin and the weighing feeding together, thereby resulting in the total distance between the bin feeding and the feeding. The placement of the whole process of the multihead weigher is carried out on the total distance of the load cell. Connect separate measuring and testing machines and equipment according to incoming and outgoing raw materials to maintain the total distance of the silo and the structure of the silo support point.
The net weight of the multihead weigher silo is supervised and operated by the mobile phone software of the measurement and detection throwing system software. According to the reduction of the net weight of the silo, in the weightless state, the mobile phone software of the feeding and crushing system software will continuously and accurately measure the feeding halo, compare the feeding halo with the control parameters, control the spiral speed, and ensure that the feeding cover is the same as the control parameters. . The actual operation of feeding is carried out continuously until the net weight of the weighing bin reaches the preset low control parameters.
When the low limit control parameters are achieved, the feeding valve on the top of the weighing material will be completely opened, and the material will be fed into the weighing silo. the limit control parameters, the feeding system will be turned off, and the new weightless state operation cycle will just begin. During the whole forming process of the company's carbon factory, the automatic batching system software is an important mobile software for the actual operation of the measurement and detection system software, which has great harm to the quality and indicators of the anodizing treatment of the carbon factory. Its crux is made up of three weight-loss scales and four electronic belt scales (to name them).
According to the diligent study, social practice activities and scientific research of the three types of multihead weighers, Bian Xiao has some simple knowledge and understanding of multihead weighers. The key here is to introduce the basic concepts and calculation methods of multihead weigher measurement and detection in a simple and detailed manner, and develop together with everyone. 1. Construction and composition.
The multihead weigher is generally composed of core components such as feeding water gate, weighing bin, mixing equipment, feeding machinery and equipment, external sound card rack, weighing sensor and measuring and testing actual operation machinery and equipment. 1. Feed water gate. The hydraulic gate of the feeding hydraulic press is used to feed the weighing silo, globe valve, butterfly valve, globe valve, etc.
often selected. Generally speaking, the important concern is its technical parameters, such as sealing characteristics, coordination of the main power switch, rapid and stable explosion-proof switches, etc. 2. Weighing positions.
Weigh bins are media for weighing raw materials. The selection of raw materials should take into account corrosion resistance and acid resistance. Its volume is selected according to the 3-minute feeding amount under the large total feeding total flow, and the feeding time should account for a very large proportion in the whole weighing process, about 10%.
3. Stirring equipment. The key of the mixing equipment is to assist the pouring of raw materials with poor circulation, which is generally composed of a simple arch-breaking arm drive motor combined with a spiral auger blade or nail teeth. Depending on the rotation of the arch-breaking arm, materials that are very prone to arch-breaking and rat-holes can be successfully dropped into and out of the access site.
1. Water supply gate; 2. Weighing bin; 3. Load cell. 4 External sound card rack 5 Mixing equipment 6 Feeding machinery and equipment. 4. Feeding machinery and equipment.
The feeding machine equipment is used to discharge and weigh the chemical fiber raw materials in the silo. According to the characteristics of the raw materials to be transported and the different geographical environment, screw conveyors, impeller feeders, vibrating feeders and belt feeders can be selected. In most places of use, screw conveyors are better than other closed feeding machines, which can not only transport raw materials evenly, but also prevent the flying and eruption of powdered raw materials.
5. External sound card holder. The external sound card rack is the fulcrum of other mechanical equipment, and the load cell is installed on it. on top.
6. Load cell. The load cell is an important weighing component of the multihead weigher. Generally, a strong strain sensor with a high-resolution resistor is used to convert the net weight signal of the raw material into an electronic device data signal output. 7. Measurement and detection control system.
The actual operation of the measuring and testing equipment is composed of an intelligent multihead weigher case and an automatic automatic control system. In addition, the channel and feeding port of the multihead weigher should generally use soft, dirt-resistant and airtight conductive and conductive soft connections to ensure that the connection between the storage bin and the equipment after the event does not hinder the weighing. The weighing bin of the multihead weigher and the adjustable feeding device installed below it are located on the load cell fixed to the external sound card structure.
Second, the basic principle. 1. Fundamentals. As shown in the figure, the multihead weigher performs metrological inspections based on the basic concept of controlling net weight damage during operation.
First, weigh the feeding equipment and weigh the warehouse stock. According to the damage of the net weight per unit time, the feeding rate set by the specific feeding rate is compared, and then the feeding machinery and equipment are operated, so that the specific feeding rate accurately considers the control parameters from beginning to end. During the entire feeding process in a short period of time, the feeding machinery and equipment use the interaction force to make the control signals stored in the middle and later stages of work to carry out actual operations according to the basic concept of volumetric type.
Load Spectrum Scheme. 2. The whole process of weighing. The net weight of the raw materials in the weighing bin is converted into a data signal of the electronic device according to the load cell, which is transmitted to the multihead weigher case.
The multihead weigher case compares the measured net weight of the raw material with the preset upper and lower limit values of the net weight, and controls the feeding hydraulic door according to the PLC to intermittently feed the raw material into the weighing warehouse. In addition, the multihead weigher case compares the measured specific feeding rate (total output) with the preset feeding rate, and uses PID adjustment to actually operate the feeding machinery and equipment to make the specific feeding rate Control parameters can be precisely tracked. When the door of the feeding hydraulic machine is opened and the material is fed into the weighing silo, the control signal locks the feeding rate and starts the volume opening.
The multihead weigher panel displays information on the specific feed rate and the total net weight of the raw material discharged. Schematic diagram of the power supply circuit in operation. 3. Calculation of feeding rate.
The feeding rate (total output) of the multihead weigher is the damage value of the net weight per unit time, which theoretically indicates the following: MT=dG/dt.MT type a cutting rate. DG - Destruction value of net weight. dt - precise precise measurement period.
The feed rate under the multihead weigher case display condition can be calculated by the following formula. MT=n(dβ*d1)/(tdte) In the formula calculation, d——Display information The content of the information on the case of the multihead weigher indicates the label value. N——The displayed transition frequency.
D1——multihead weigher internal partial resolution——Measurement error index value, generally β=0.6Td——Precise measurement cycle. Te——The index value for the reason of timing error, generally te=0.001. 4. Calculation of total weight.
In a detailed total cycle system time, the total net weight Gq of the multihead weigher consists of two parts, namely the net weight VA of the case of the multihead weigher used for metrological testing and storage and the weighing bin that has not undergone metrological testing during the feeding period. Net weight VD of the strand. Gq=VA+VD.VA=(VH+￡H)-(VL-￡L)VD=MTL*tF.In which VH——It is the upper limit value of the net weight of raw materials in the weighing bin. VD——The lower limit value of the net weight of raw materials in the weighing bin.
£H——The reason for the error in the weighing specified value on the net weight. £L——The reason for the error in the weighing specified value under the net weight. MTL——Locked feeding rate during feeding period.
TF - Feeding time. The locked feeding rate MTL is still indicated by the k net weight display value changed per second: MTL=K(dβ*d1)/(1te) The feeding time depends on the total feeding flow of the hydraulic gate of the feeding hydraulic press MF, MF≈10mttf=va/MF. The exhaustive total period is te=tF+td.
The mean flow is Mq=Gq/tn. The total net weight at the time t=0-TN can be calculated by continuously accumulating the net weight of the cut material in each cycle. 5. Results.
In other types of weighing equipment and machinery equipment, generally due to the bonding of raw materials, the temperature change of the load cell causes the tare weight change, which in turn reduces the precision of the system. The multihead weigher has already solved this defect, and it is not easy to reduce the weighing precision due to temperature changes. The reason is very simple.
The accurate measurement of the feed rate of the multihead weigher is based on the net weight difference, not the net weight. Therefore, #multihead weigher has a very broad application prospect in manmade fiber raw material transportation system.
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