Scheme design and application of online multihead weigher for skin care products

Author: Smartweigh–Multihead Weighter

Multihead weigher, also known as net weight inspection scale, screening scale, net weight screening scale, inspection scale, sorting scale, can separate loads (items) of pre-packaging companies of different quality according to their quality and error value set points. The deviation is subdivided into two or many categories. It is a high-speed, precision machining online net weight detection automation equipment. The multihead weigher is integrated with various packaging production lines and transportation information management systems, and can timely monitor online overweight and underweight unqualified products in the automatic production line, as well as whether there is a lack of prefabricated components in the packaging. Multihead weigher is widely used in automatic production line automatic net weight detection in the pharmaceutical, food industry, chemical enterprises, health drinks, plastics, rubber materials and other industries. It is also an indispensable link in the production process of the food industry, medicine and other industries.

In order to better safeguard the legitimate interests of consumers, operators and operators, according to the requirements of the "Measurement Law of the People's Republic of China" and "Measures for the Supervision and Administration of the Measurement of Quantitative Packaged Commodities", for qualitative analysis of packaged commodities, a single piece of Qualitative analysis of the actual composition of packaged goods should accurately reflect the marked net weight, and the difference between the marked net weight and the actual composition should not exceed the specified allowable urgent shortage. Final inspection of product net weight In the final link of commodity economic production and manufacturing, the net weight of the product is re-examined, and the unqualified products are removed to ensure that the original product net weight meets the requirements, which is conducive to ensuring mutual understanding between consumers and the processing and manufacturing industry. Consumers are not easy to suffer losses due to shortfalls, and manufacturers are not harmed by reputation due to customer complaints or even reports. At present, multihead weigher is divided into online monitoring and offline promotion detection. Online monitoring includes continuous type and intermittent type, and offline promotion detection is generally intermittent type.

On-line continuous testing generally adopts belt conveyor, which is integrated with medium and high speed automatic production lines. The online multihead weigher includes a feeding belt conveyor, a weighing belt conveyor and a feeding and removing belt conveyor. The system is established according to basic parameters such as automatic production line speed, product basis quantity, product length and the length of the weighing belt conveyor. The speed of the feeding belt conveyor allows the automatic production line products to be separated, ensuring that only one product is weighed on the weighing belt conveyor, in addition to reducing the product in and out of the weighing belt conveyor due to the front and rear belt conveyors The speed is not the same as the weighted damage. For cylindrical products or short cylindrical products with large aspect ratio and long thinness, because the whole process of transportation is very easy to rotate, and the net weight of the product is relatively light, the condition of the product is unstable at the time of the basis, which will have a negative impact on the weighing of the product. The measurement results are not accurate.

Especially skin care products (such as eyeliner, lipstick, etc.) are small in diameter, long and slender, and only transported along the length direction. They are weighed by a weighing belt conveyor. The whole process of transport is very prone to rotation, and the reliability is poor. Very heavy damage. In order to solve the lack of professionalism at this stage, for skin care products with small diameters and long slenderness, an online multihead weigher is installed in the skin care product production line. Rotate, maintain the reliability of the whole process of product transportation, carry out high-speed dynamic and stable weighing online, and ensure the accuracy of online net weight detection of products. The online multihead weigher of new product development skin care products has been funded by the app.

2.3.7 It has the functions of shift data analysis, daily data analysis, monthly data analysis, and long-term data analysis, data analysis of qualified products, unqualified products (underweight, overweight) quantity, qualified product rate, total hourly output, etc., and submitted in time Customer intelligent intelligent management system, with a variety of graphic data analysis and display; 4 important structural and professional characteristics The main and driven drums adopt the overall design of the waist drum shape, which can effectively prevent the belt from deviating in the direction. In addition, the main and driven drums must be subjected to a dynamic balance test with a level of 6.3G (deviation 0.4g) to avoid the main and slave rolling. Vibration caused by unbalanced barrel movement damages gravimetric checks. The weighing belt conveyor adopts AC servo motor controller, which can adjust the running speed of the belt conveyor immediately according to the basic parameters such as the length and quantity of the inspected product workpiece, so as to ensure the surface layer of the weighing belt conveyor. Only one product is weighed; the communication between the AC servo motor and the active drum is driven by a synchronous belt, which is stable and without noise. The V-groove rain shield is set on the belt of the weighing belt conveyor, which can effectively prevent the cylindrical products from rotating during the whole process of transportation, and ensure the reliability and accuracy of the weighing and measurement verification.

The weighing belt conveyor is equipped with an anti-wind cover to prevent the damage to the weighing measurement verification caused by the external wind. In addition, it also prevents the workers from touching the weighing belt conveyor and harming the weighing measurement verification. The middle of the weighing belt conveyor and the frame adopts the overall design of the tenon stop, the hidden buckle is fixed and can be released quickly, which is convenient for the elimination and maintenance of the belt conveyor. The master and driven drums of the weighing belt conveyor are equipped with an electronic optical detection power main switch to detect whether the product has completely entered the weighing belt conveyor and whether the product has to leave the weighing belt conveyor to ensure that all products are in Weighing measurement verification is carried out on the weighing belt conveyor to ensure the accuracy of weighing.

4.2 The structure of the feeding belt conveyor and the feeding belt conveyor is the same as that of the weighing belt conveyor, but the dynamic balance test of the main and driven drums is not performed. 4.3 The weight sensor adopts a closed overall scheme design, which consists of a base cover, a weighing sensor, a connecting seat, etc. The base cover is provided with an overvoltage protection anchor screw under the connecting seat weighing sensor. After the weight sensor is installed, it must be When doing bilge inspection, when the load is increased to the rated current load, the output of the load cell is 1 mV, and the anchor screw is protected by adjusting the overvoltage. If the load is expanded to exceed the rated current load again, the output of the load cell is The millivolt value is always the same. The weighing sensor adopts the HBMPW6KRC3 type more weighing sensor, and the size of the large weighing platform is 300mm.×300mm.

4.4 Removal method According to the net weight and quantity of the product, the air blowing type or the cylinder push rod type can be selected. For the net weight of the product less than 500 grams, the air blowing removal method can be selected. The air blowing removal method has a simple structure and high efficiency. Removing machinery and equipment is fixed on the feeding belt conveyor, and the unqualified products (underweight and overweight) are classified by net weight. Several removal machines and equipment can be used to make the unqualified products enter the relative collection boxes respectively. The information shown in Figure 2. The unqualified product collection box adopts a closed overall scheme design. The collection box is equipped with a feeding door and repaired, and the staff is responsible to ensure that the unqualified product can be effectively managed.

4.5 The programmable controller is selected in the automatic automatic control system of electrical equipment. After receiving the operation signal of the automatic production line from the customer, the automatic automatic control system of electrical equipment automatically starts to run. In addition, if there is a common problem alarm on the skin care product online multihead weigher, the common problem will also be reported. The information is fed back to the customer's automatic production line automatic control system. When the photoelectric switch of the feeding belt conveyor detects the product, the online multihead weigher of the skin care product runs, and the online weighing and measurement verification of the product is carried out, and the unqualified products are removed from the automatic production line according to the removal machinery and equipment. The net weight detection data analysis results provide feedback signals in time to control the net weight of product packaging design.

5 Summary According to the professionalism of dynamic weighing of belt conveying, according to PLC control, the skin care products of the automatic production line enter the weighing belt conveyor according to the feeding belt conveyor, and the weighing controller adopts the external opening method or the internal opening method. The product is checked by online weighing and measurement, and the net weight value obtained by the individual is compared with the net weight value of the guiding ideology set in advance to determine whether the net weight of the tested object is qualified or not. The non-conforming product is removed according to the removal of machinery and equipment, and no one is involved in the whole process. In addition, the net weight detection data analysis results will provide feedback signals in time, control the net weight of product packaging design, and effectively control the cost. This professional product can be used for online monitoring of the net weight of commodity economic production lines in the pharmaceutical, food industry, chemical companies, health drinks, skin care products, plastics, rubber materials and other industries.

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