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Structural Features of the Rubber Filter Press

Time：

2021-09-06

The rubber filter press, also known as a fixed-chamber belt vacuum filter, is a modern solid–liquid separation device with a high degree of automation. It typically comprises a rubber filter belt, a vacuum box, drive rollers, a belt support frame, a feed hopper, a belt‑alignment device, a belt‑washing system, and a frame, and it achieves solid–liquid separation by fully leveraging the material’s gravity and vacuum suction.

The rubber belt filter uses a filter cloth as the filtration medium and employs an integral annular rubber belt as the vacuum chamber. The annular belt is driven by a transmission mechanism to run continuously, with the filter cloth laid on the belt and moving in synchrony. The belt contacts a vacuum slide table—between the vacuum chamber and the belt there is an annular friction strip through which water is introduced to form a water seal—and the slurry is evenly distributed onto the filter cloth by a distributor. When the vacuum chamber is connected to the vacuum system, a vacuum filtration zone is established on the belt; the filtrate passes through the filter cloth, is collected in transverse grooves on the belt, and exits via a central port into the vacuum chamber, while solid particles are retained on the filter cloth to form a filter cake. The liquid exiting the vacuum chamber is discharged through a gas–water separator (located at the sealed bottom of the discharge tank). As the rubber belt moves, the formed filter cake sequentially passes through the cake‑washing zone and the dewatering zone, after which the filter cloth and the belt separate, and a scraper at the discharge roller removes the filter cake. The filter cloth, once the cake has been removed, is cleaned to regenerate it, then passes through a set of support rollers and a web‑alignment device before reentering the filtration zone, thus commencing a new filtration cycle. Compared with mobile‑chamber vacuum filters, this rubber belt filter overcomes the drawbacks of mobile belt filters—namely, the need to release the vacuum and the relatively high energy consumption associated with each operational cycle—enabling truly continuous operation and uninterrupted filtration. From feeding the material, vacuum dewatering, cake washing, slag removal, to filter‑cloth cleaning, all processes can proceed continuously and in parallel.

Structural features of the rubber filter press:

1. A fixed vacuum chamber is employed, with the tape moving over it. An annular friction strip is positioned between the vacuum chamber and the tape and sealed with water. This arrangement creates a dynamically sealed interface between the vacuum chamber and the tape; the sealing water serves both as a lubricant for the sealing mechanism and as a coolant, thereby constituting a highly effective vacuum‑sealing system.

2. In terms of belt support, multi-stage idlers are installed horizontally along both sides, effectively reducing the frictional resistance during belt operation.

3. In terms of overall structure, a detachable frame design is employed, ensuring convenient installation and maintenance of the annular belt as well as routine equipment upkeep.