We will outline some of the domestic stainless steel air knife drying solutions, mainly using the following schemes: compressed air hot air drying, high-pressure fan hot air drying, or high-pressure hot air blower drying, etc., the details are in the following.
In the production line of filling products, the outer surface of the bottle for filling products (such as wine, soda, etc.) should be labeled, inkjet or boxed. In order to achieve better results, it is required to dry the surface of the bottle. In the actual production of current, typically on the bottle or using a drying method of drying.

In the production, the drying is generally carried out by a brush-bake combination or a hot-bath drying type, and the brush-brushing device mainly uses a brush to rotate and remove the water droplets on the bottle wall. Due to the contact treatment, the brushing effect is closely related to the appearance of the bottle. The rotating body (such as a cylinder) has a good brush effect, and some surfaces of the non-rotating body and the like have some parts that are not in contact with the brush, and there is still a water film on the outer wall of the part after the bottle is brushed. In addition, during use, the brush is easy to accumulate dirt, which may be transmitted to the outer wall of the bottle and affect the quality of the package. The hot oven drying type has simple structure and complete drying, but its thermal power is high and the working temperature is high. When the automatic production line is arranged, it is required to be isolated. When drying, the water needs a long time to completely evaporate, which is not suitable for high-yield online. Production, and when the transmission system such as card bottle or bottle is blocked during work, the bottle stays in the oven for too long, which may cause the bottle to burst. In addition, for the surface of the product with high cleanliness requirements, after the cleaning and rinsing process, the drying method cannot generally be used. This is because not only the surface of the bottle is required to be dry, but also the surface of the product and the rinsing water must be solved. A water spot problem that occurs after drying with impurities. Dry manner, i.e. the process of filling the product in packaging applications pneumatic technology, the use of high pressure gas through the fan air stream and accumulated knife and accelerated blowing water, and the aqueous product stream may be utilized to blow the surface removed.

There are many air knife drying solutions that are widely used in China: dry air by compressed air, dry air by high-pressure fan, or dry by high-pressure hot air blower (heating head made of high-infrared tube). In this paper, a new type of high-efficiency cold air drying and dewatering equipment structure is designed. The high pressure air blower is used for cold drying. The high temperature airflow from the air knife nozzle is used to dry the residual water on the bottle surface without using any heating equipment. . The blow drying and dewatering equipment includes a high pressure blower, two special air knives and related accessories. The low-speed airflow blown by the fan enters the air knife chamber through the fan, and then passes through the ever-shrinking variable-section air knife nozzle to form a high-speed airflow to be sprayed onto the surface of the bottle. Each special air knife is equipped with a spray height and angle adjustment lever to suit the drying of bottles of different shapes and sizes. The rated power of the fan used in the design is pt=5.5kw, the rated flow rate is L=0.1467m3/s, that is, m=0.1768kg/s (at 20°C), and the rated pressure is P=0.3MPa. Assume that the fan is working under rated conditions, the environmental conditions are 0.1 MPa, and the air temperature is T0 = 20 °C. The airflow generated by the fan enters the two air knife chambers on both sides of the filling product line through two pipes. Considering that the pipe is short and the sealing is good, it can be considered that the airflow enters the air knife chamber and finally flows out. There is no loss of air volume. In actual operation, the smaller the gap height of the air knife nozzle, the greater the resistance to the jet airflow, and the more heat the whole system converts. The shorter the life will be according to the operating characteristic curve of the fan. Therefore, when setting the gap height, it is determined after balancing the jet speed of the air knife and the operating life of the fan. The shorter the injection port guiding section, the better, so as to reduce the unnecessary friction loss, but it should not be too short. It is better to use the gap design height of 3 times, otherwise it will not be able to spray a good guiding airflow, which will make the injection place. The airflow cannot be concentratedly sprayed onto the surface of the bottle, resulting in the inability of the remaining water droplets to be effectively blown off. During the operation of the blow-drying and dewatering equipment, the pressure and air volume characteristics of the fan are a curve. In the non-rated state, the air flow rate of the nozzle can be dynamically obtained by experimental measurement, so that

Adjust the operating status of the fan in time.

In addition, during the design and installation of the blow-drying and dewatering equipment, it is necessary to pay attention to the spray angle of the two air knife nozzles. Due to site restrictions, an air knife driven by the same fan was installed on both sides of the bottle line. In order to improve the drying efficiency, the pair of air knives on both sides cannot be blown in pairs. Because even if the jet velocity of the air knife is very high, it may form a stagnation point on the surface of the bottle to affect the effect, and the jetted airflow will bounce back under the action of the opposite flow, thereby causing a large injection loss. . In the operation line of the conveying bottle, in addition to the necessary considerations, the design should also make necessary restrictions on the running speed of the workpiece to ensure the time when the surface of the bottle is blown by the air knife, and of course, the fan and the air knife can be added. To improve efficiency. Aiming at the drying demand of the bottle of filling products, this paper designed a new type of efficient cold-drying and water-removing equipment. Computational analysis of the airflow in the structure of the blow-drying equipment and the related problems in the operation of the equipment

Discussed.

Company Name: Guangzhou Shengshi Electromechanical Co., Ltd. National unified service hotline: 400 888 7938 switchboard: 020-36210696 020-36210086 Fax: 020-36309810 020-86620363 Sales Manager: Jiang Manager 020-86543986 QQ Yao Manager 020-86541087 QQ Technical Consultant : Chung 020-86543969 QQ address: Wo Street long red village of Wang Su Tai Road No. 1, Guangdong Province, Baiyun District, Guangzhou City.

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