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Typical applications of automatic weighing machines are:
(1) Check if the product is overweight or underweight.
(2) Ensure that the product meets the legal requirements for net content.
(3) Integrity test: whether to lose a single item in the product (such as whether the whole box is missing, missing a bottle, or lacking a bag) or to check whether the necessary components (such as manuals, manuals, gifts, etc.) are missing in the package.
(4) Through the checkweigher, the filling machine feeds back and adjusts the filling volume to reduce waste.
(5) Measure and evaluate the efficiency of the production line. The primary value of the automatic weighing machine is 100% weighing and categorizing the products on the production line to ensure that the products whose weight does not meet the requirements will not flow to the market, ensuring that the interests of consumers are not infringed and that the manufacturers are not wasted on cost. Loss of credit.
The upstream product enters the metering conveyor at regular intervals via the induction conveyor, and when passing through the photoelectric sensor located at the front end of the metering conveyor, the weight detector starts to meter the product. As the product passes through the metering conveyor, the weighing unit (weight sensor) completes the measurement of the product and displays the data to the operating unit. The computer automatically compares the displayed measurement data with preset standard weight values ​​and upper and lower limit values, and identifies and sorts genuine, overweight, and light products. The entire process does not interrupt the normal operation of the product line without manual intervention.
When the package runs from point A to point B, the weight on the weighing platform reaches the weight trigger point. After the invalid AD number is set, the instrument digitally filters the collected effective AD number, and the effective AD number reaches the value. When the value is fixed, it is averaged again and the weight of the object to be detected is calculated. The instrument compares this weight with the set standard value to determine which area the detected object belongs to, and judges whether to reject it. When the detected object leaves the weighing platform, automatic zero tracking starts to work until the next one enters the weighing platform.
Automatic weighing machine accuracy The precision of an automatic weighing machine can be defined as: a single object weighing several times on an automatic weighing machine, the standard error of its weight value (premise: average error = 0).
The most important evaluation index of the accuracy of the automatic weighing machine is the mean value and the standard deviation average value: a value obtained by dividing the sum of a group of data by the number of the data in this group.
Standard deviation: A measure of the degree of dispersion of the data distribution to measure how much the data value deviates from the arithmetic mean. Normally, we define the dynamic accuracy of a checkweigher with a ±3 standard deviation. If the given product has a smaller standard deviation under a given test condition, the higher the dynamic accuracy of the device is, . What needs to be clear is that the dynamic accuracy must be the accuracy under the given product, the given detection conditions and the given accuracy definition method. The main factors affecting the accuracy of the automatic weighing machine are:
(1) Product factors 1 Product categories (such as exterior, solid or bottled liquids, etc.);
2 product weight;
3 throughput (belt speed, weighing time, length of the weighing table);
4 Product stability (center of gravity, bottom flatness, surface reflection, etc.).
(2) Environmental factors 1 Temperature, humidity, etc.;
2 air flow, ground vibration, belt scraping and other factors.
(3) Human factors 1 Inappropriate use and incorrect settings;
2 machine level and so on.
The basic methods and requirements for ensuring the accuracy of the automatic weighing machine (1) Guarantee the accuracy by ensuring the passing status of the tested product Due to the diversity of the tested products, the state of the detected object passing through the weighing part of the automatic weighing machine is on the check weighing scale. The accuracy has a great influence. Before a batch of objects to be tested passes through the checkweigher, there must be a process that is equidistantly separated and the spacing must be large enough to be a certain value. Make sure that the next product can contact the weighing table after the previous product has completely left the weighing table, that is, to ensure that only one object to be tested enters the weighing table at a time. This can be achieved by increasing the checkweigher's conveying speed, forming a speed difference with the previous conveying equipment, and increasing the distance between products to a certain extent to ensure the checkweigher's weighing requirements. The stability of the tested product on the weighing table is also an important factor affecting the accuracy. When the product to be tested enters the weighing section through the induction conveyor, a smooth transition must be ensured. First of all, the speed of the conveyor to be imported and the speed of the weighing table conveyor should be adjusted to the same, and the speed difference should be minimized as much as possible to ensure a smooth transition of the tested products when they pass through the engagement position. In addition, due to the variety of objects to be detected, if the center of gravity is too high or the area of ​​the bottom contact table is too small, tilting, jumping, etc. may occur when passing through the engagement position, causing the weighing table to vibrate and affect the accuracy. In this case, transitional devices such as transitional skateboards, ball transfer plates, etc. can be added at the connecting position of the conveyor.
Another important factor affecting the accuracy of the automatic weighing machine is the delivery speed of the product being tested. From the production operation point of view, in order to increase production efficiency, it is always hoped that the production line speed can be maximized. But for automatic weighing machines, the contradiction between speed and accuracy has always existed, and the faster the speed, the more difficult it is to guarantee accuracy. The dwell time (effective weighing time) of the tested product in the weighing section should reach a certain length. This time must meet the requirement of the instrument controller for the number of weighing sensor signal sampling points. The sampling time of the signal is too short and the number of sampling points is too low. The instrument controller cannot calculate the exact arithmetic average, and the accuracy of the weighing result cannot be guaranteed. It is possible to increase the weighing time by appropriately lowering the conveying speed, or increasing the length of the weighing table within the allowable range, so as to ensure that the minimum number of sampling points of the instrument controller is satisfied. On this basis, accurate calculations can be used. To a certain extent, the weighing accuracy is guaranteed.
(B) to ensure the accuracy by improving the equipment operating environment Automatic weighing machine is a high-precision re-inspection equipment, usually the weight of the detected objects are very small, but in the high-speed operation under the weighing accuracy will be more sensitive, Affected by many environmental factors. For example, temperature, humidity, electrostatic induction, radio frequency interference, ground vibration, air circulation, etc. in the working environment. Therefore, the use environment of the automatic weighing machine is also a key factor to ensure the accuracy. First of all, we should try our best to put the automatic weighing machine in a suitable and constant working environment with temperature and humidity, and avoid unstable and irregular changes of various indexes. If necessary, an electric heater can be added to the load cell module to directly control the working environment of the load cell.
Electrical grounding of the equipment should be well done to reduce static induction, keep away from strong radiation, and avoid wireless electromagnetic interference. The air flow will also have an impact on the accuracy of the automatic weighing machine. It is better to install the equipment in a sheltered production workshop and add a windshield at the weighing position, which can effectively improve the stability of the equipment operation.
(III) Guaranteeing Accuracy by Improving Production Technology The working state of the automatic weighing machine is weighed in a high-speed operation, which puts forward higher stability requirements for the conveying equipment involved in weighing. Therefore, the conveying mechanism of the weighing section must minimize the noise and vibration during operation. This requires that the active roller and the driven roller of the conveyor be separately subjected to static balance and dynamic balance experiments before assembly. The experiment needs to be repeated, and the counterweight is modified until the deviation value is reduced to the design requirements. This is also a key factor in ensuring weighing accuracy.
The weighing sensor is the core component of the automatic weighing machine and the most common one in industrial applications is the strain gage sensor. This is a sensor that uses strain gages to convert strain to resistance change. It is widely used in various areas of weighing. However, with the development of science and technology, sensors used in automatic weighing machines have also emerged as new types of devices with higher technological content, such as electromagnetic compensation sensors. The working principle of the electromagnetic compensation sensor: When putting the weight on the weighing pan, the balance of the system will be broken. At this time, the displacement sensor will output a position change signal to the current regulator, and the current regulator will adjust the output current in time so that the current flowing through the conductor increases until the electromagnetic force generated by the current regulator and the weight of the weight cancel each other out. Electromagnetic compensation sensors are characterized by faster response and higher accuracy.
The reject and sort sections are also an important part of the automatic weighing machine. In the process of online work, products that have been detected as unqualified or of different weight grades need to react quickly and accurately in the shortest time. The mechanical action is too fast or the force is excessive to cause a certain vibration, which affects the weighing accuracy of the checkweigher. We can separate the racks from the checkweigher's entire rack by removing or removing the racks, and fix the distance between them and the checkweigher through a soft connection to minimize the impact caused by the mechanical movement. The impact of vibration on accuracy.
The above information will give you an introduction on how to ensure the measurement accuracy of the online dynamic automatic weighing machine. If you want to know more about the automatic weighing machine, please come to our company for advice! Related Articles Recommendation: How to ensure the measurement accuracy of online dynamic automatic weighing machine
How to Guarantee the Measurement Accuracy of Online Dynamic Automatic Weighing Machine
The automatic weighing machine is mainly composed of electronic components and a weighing frame, and is used for detecting whether the weight of the products to be inspected in the product production line meets requirements or classifies the detected products according to the weight class. The automatic weighing machine is a kind of dynamic weighing system, which is different from the static weighing of the balance. It is to do 100% online weighing of the products passed on the production line, and at the same time to classify, filter or reject the products according to the preset value. In general, its structure can be divided into: input part, weighing part, output part, display part, reject part and calculation control system.