Adhesive Gear Melt Pump
I. Working Principle: Core Concept of “Intermeshing Conveyance”
The core principle of the adhesive melt gear pump involves the rotation of two intermeshing gears to achieve adhesive intake and discharge. The process can be divided into three distinct stages:
Intake Stage: The gears rotate in a fixed direction. The gear teeth in the feed zone gradually open, creating a low-pressure space. Under external pressure, adhesive enters the tooth cavities.
Conveyance Stage: As the gears continue rotating, the tooth cavities containing adhesive move from the feed zone to the conveyance zone. The adhesive is driven by the gears, smoothly conveyed forward along the inner wall of the pump housing.
Discharge Stage: Upon reaching the discharge zone, the two gears re-mesh. The tooth cavity space is compressed and reduced, forcing the adhesive out of the cavities. It is then expelled through the outlet pipe, achieving continuous conveyance.
II. Structural Characteristics: Simple Yet Demanding High Precision
Its design centers on “stable adhesive delivery,” with core components and features as follows:
Core Components: Consisting of the pump housing, drive gear (power transmission end), driven gear (meshing and rotating with the drive gear), sliding bearings (supporting the gear shaft), and sealing devices (preventing adhesive leakage).
Key Features:
Simple structure with compact dimensions, facilitating easy installation and routine maintenance, making it suitable for space-constrained environments.
Extremely high gear meshing precision is essential; excessive tooth clearance causes adhesive backflow, compromising delivery accuracy and pressure.
Gears are typically fabricated from wear-resistant materials (e.g., stainless steel, engineering plastics) to withstand adhesive particles, thereby extending pump service life.
III. Application Scenarios: Suited for “High Precision, Medium Viscosity” Requirements
Its applications strictly align with its “positive displacement delivery” characteristics, primarily in fields demanding high delivery precision and stability:
Suitable Conditions: Medium adhesive viscosity (neither too thin to cause leakage nor too thick to hinder flow), processes requiring stable flow rate and pressure.
Typical Industries and Processes:
Electronics Manufacturing: PCB dispensing (e.g., chip packaging, component bonding).
Precision Instruments: Enclosure coating, internal component sealing.
Other Fields: Small medical device assembly, automotive electronic component coating, etc.
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