Manual control screen changer

A manual extrusion screen changer is a device designed for replacing filter screens in industrial production, and it is extensively utilized in high-viscosity melt extrusion production lines, such as those for plastic extrusion, rubber processing, and chemical fiber spinning. Its primary function is to switch the filter screen through manual operation to remove impurities from the material, thereby ensuring the continuity of the production process and the quality of the products. Below is a detailed introduction to the manual screen changer:

Structural Components

Support Frame: Acts as the supporting part of the device, typically made from high-strength materials to ensure stability and durability.

Filter Screen: Used to filter impurities from the material, usually crafted from high-temperature and corrosion-resistant materials, such as stainless steel or special alloys.

Slide Plate: The core component of the manual screen changer, featuring two channels for polymer medium flow, with a porous filter plate (filter screen) embedded inside.

Porous Plate: Also known as the filter screen plate, used for actual filtration operations.

Positioning Shaft: Ensures accurate positioning of the slide plate during the switching process.

Operating Lever: A manually operated part that enables the alternating switching between two working positions by pulling the lever.

Working Principle

Dual-Position Design: The manual screen changer typically has two filtration positions, with one in operation and the other in standby.

Switching Process: When the filter screen at the working position needs to be replaced due to impurity accumulation, the operator pulls the operating lever to move the standby position into the working location while simultaneously removing the working position for filter screen replacement.

Sealing Design: Employs an elastic sealing device to prevent material leakage during the switching process, ensuring the continuity of production.

Features and Advantages

Simple Structure: The manual screen changer has a compact design, occupies minimal space, and is easy to install.

Easy Operation: No complex control system is required; operators can complete the screen-changing operation by simply pulling the operating lever manually.

Low Cost: Compared to automatic screen changers, the manufacturing and maintenance costs of manual screen changers are lower, making them suitable for small-scale production or enterprises with limited budgets.

Wide Application Range: Suitable for high-viscosity melt extrusion production of various raw materials, including PP, PE, ABS, PS, PET, PVB, PBT, TPE, PMMA, PC, PA, etc.

High Wear and Pressure Resistance: The filter screen is designed using high-wear and high-pressure-resistant materials, enabling long-term stable operation under high-temperature and high-pressure conditions.

Application Scenarios

Plastic Extrusion: Such as in the production of drip irrigation tapes, cast films, and blown films.

Rubber Processing: Used to filter impurities during the production of rubber products.

Chemical Fiber Spinning: In chemical fiber production, the manual screen changer can be used to filter impurities from the melt, ensuring fiber quality.

Hollow Product Production: Such as in the production of hollow containers, pipes, etc.

Precautions

Screen-Changing Speed: The screen-changing speed of manual screen changers is relatively slow, usually requiring shutdown operations, which may affect production efficiency.

Filter Screen Diameter: Considering friction resistance and sealing performance, the filter screen diameter of manual screen changers is generally below 100mm.

Operational Safety: When operating in high-temperature and high-pressure environments, attention must be paid to safety precautions to avoid burns or mechanical injuries.

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