Product Overview
Dehydration screens primarily serve to remove water, sludge, and medium, finding application in sand washing at aggregate plants, coal slurry recovery at coal preparation plants, and dry tailings disposal at mineral processing plants. Consequently, they are also termed aggregate dehydration screens, mining dehydration screens, coal slurry dehydration screens, tailings dry discharge screens, and high-frequency dehydration screens.
Although both fall under the category of dewatering equipment, the construction of dewatering screens varies depending on the material being processed. For instance, the sand and gravel dewatering screen used in washed sand production lines differs from the tailings dewatering screen commonly employed in mineral processing plants.
The tailings dewatering screen, also termed the tailings dry discharge screen, possesses all the superior characteristics and functions of a standard dewatering screen. Furthermore, it is frequently integrated with thickening machines for tailings dry discharge, establishing itself as the most effective dewatering screen and tailings dry discharge equipment currently available.
Working Principle
The dewatering screen employs dual-electrode self-synchronisation technology, featuring universal eccentric weights and an adjustable-amplitude vibrator. Primarily composed of a screen box, exciter, support system, and motor. Two independent vibrators are driven by a belt coupling to operate synchronously in opposite directions. The centrifugal forces generated by the two sets of eccentric masses combine along the vibration direction, with opposing centrifugal forces cancelling each other out. This creates a single vibratory force along the vibration direction, causing the screen box to perform reciprocating linear motion.
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The core components of the sand washing and dehydration machine
1. Screening box
As the primary working and load-bearing component of the equipment, it comprises the screen frame and screen surface. The frame is typically fabricated from high-strength steel plate welded together, requiring sufficient strength, rigidity, and wear resistance. The screen surface serves as the critical working plane where materials undergo dewatering, commonly constructed from stainless steel bar-slot welded mesh, woven stainless steel mesh, or laminated composite screen cloth.
2. Vibration motor (or exciter)
Provides the power source for the screening box’s reciprocating motion. Typically employs dual-motor self-synchronisation technology, where two counter-rotating motors generate linear vibration, ensuring stable operation of the screening assembly.
3. Supporting Assembly
Includes components such as rubber springs, spring mounts, and fixing clamps. These support the screening box while effectively absorbing vibration, reducing dynamic loads on the foundation and enhancing operational stability.
4. Screen Mesh (Screen Plate)
The component directly contacting the material, whose aperture rate, material composition, and structure directly influence dewatering efficiency. Common types include welded slotted mesh (wear-resistant, long service life) and woven mesh (high aperture rate, low cost). Some equipment employs multi-layer composite structures to prevent clogging.
