Overview
The white paint rotary pump filling machine is a kind of equipment specially used for filling white paint. It combines the precise conveying characteristics of the rotary pump and the quantitative filling function of the filling machine, and can efficiently and accurately fill white paint into various containers, such as paint buckets, plastic bottles, etc.
Working Principle
Paint Conveyance: The rotary pump conveys paint through a pair of rotors that rotate synchronously. When the rotors rotate inside the pump body, the paint is continuously squeezed and pushed in the space between the rotors and the pump body, thus realizing the stable conveyance from the paint storage container to the filling head. Since the rotary pump has a relatively small shearing effect on the paint, it is especially suitable for fluid like white paint with a certain viscosity, and can effectively prevent components such as pigments in the paint from being damaged and maintain the quality of the paint.
Quantitative Filling: After being conveyed to the filling head, the amount of paint filled each time is controlled by a high-precision metering device. The metering method can be volumetric metering, that is, the injection amount of the paint is precisely controlled by adjusting the rotational speed of the rotary pump and the filling time according to the volume requirements of the filling container. There is also the weighing metering method, in which a weighing sensor is set under the filling head, and the filling will automatically stop when the set weight is reached.
Main Structural Components
Rotary Pump Part
Pump Body: Usually made of stainless steel to prevent the paint from corroding the pump body. Its internal structural design can ensure the smooth flow of the paint and reduce paint residue. The clearance between the pump body and the rotors is very small, which helps to improve the efficiency and sealing performance of the pump.
Rotors: Commonly, there are two-lobe or three-lobe rotors. The selection of their shapes and materials needs to consider the adaptability to the paint. The rotors with a smooth surface can reduce the resistance of the paint during the conveyance process and avoid excessive shearing of the paint. The material of the rotors is generally also stainless steel, ensuring the chemical stability when in contact with the paint.
Shaft Seal: The function of the shaft seal is to prevent paint leakage. For the white paint rotary pump filling machine, mechanical seals are usually adopted. The mechanical seal is composed of components such as the moving ring and the stationary ring, and can form a good seal between the high-speed rotating shaft and the pump body, and also has certain wear resistance and corrosion resistance.
Filling Part
Filling Heads: The number of filling heads can be configured according to the actual production needs. Generally, there are single-head, double-head or multi-head filling heads. The structural design of the filling heads should ensure that the paint can flow evenly and stably into the filling containers and can adapt to containers with different shapes and calibers. The material is usually stainless steel or food-grade plastic to ensure the hygiene and quality of the paint.
Metering Devices: As mentioned above, the metering device is the key to realizing accurate filling. It can be connected to the control system, and filling parameters such as filling amount and filling speed can be set through programming. In the volumetric metering device, there will be high-precision flow meters or metering pumps used to precisely control the volume of the paint.
Container Positioning Devices: To ensure the accuracy of filling, it is necessary to position the filling containers. This part of the device can be a simple positioning fixture or a combination of a conveyor belt with a relatively high degree of automation and positioning sensors. Through precise container positioning, the filling heads can accurately inject the paint into the central position of the containers to avoid paint overflow.
Advantages
High Filling Precision: Due to the adoption of precise metering devices, whether it is volumetric metering or weighing metering, the filling error of white paint can be controlled within a relatively small range, generally reaching an accuracy of ±0.5% - ±1%, meeting the strict requirements of paint production enterprises for product quantitative packaging.
Wide Applicability: It can fill white paint with different viscosities, and can handle well from low-viscosity latex paint to high-viscosity oil-based paint. Moreover, it can adapt to various types and specifications of containers, such as plastic bottles with different calibers, metal cans, cardboard barrels, etc., having strong versatility.
Maintaining Paint Quality: The low-shear conveying characteristics of the rotary pump make it so that during the filling process of white paint, quality problems such as pigment agglomeration and paint layering will not be caused due to excessive mechanical action. Meanwhile, the whole filling process is carried out in a relatively closed system, reducing the contact between the paint and the external environment, which also helps to maintain the quality of the paint.
Efficient Filling: It has a relatively high filling speed. Depending on factors such as the number of filling heads and the viscosity of the paint, several to dozens of bottles can be filled per minute. Moreover, the equipment operates stably and can work continuously for a long time, improving the production efficiency of paint filling.
Application Scenarios
Paint Production Factories: It is used for the finished product packaging of white paint, accurately filling the paint on the production line into containers for sale, and is one of the key equipments in the paint production process.
Paint Sub-packaging Enterprises: For some enterprises that purchase bulk paint from large paint production enterprises and then conduct small-package sub-packaging, the white paint rotary pump filling machine can help them complete the sub-packaging tasks efficiently and accurately, meeting the requirements of different customers for paint packaging specifications.
