1. Product Overview

ZOOMRY CEMA D rubber disc return idlers are heavy-duty return side components with alternating rubber discs that prevent material buildup and protect the return belt. Built to CEMA D standards for mining and bulk material handling, these rubber disc return idlers use spaced rubber discs along the roller to shed sticky carryback — preventing roller diameter changes that cause belt mistracking and premature bearing failure on conveyors handling wet, sticky materials.

Compared to CEMA E rubber disc return idlers for extra heavy-duty 96-inch belts, the CEMA D version covers the heavy-duty 24–72 inch range — the standard size for coal, clay, and overburden conveyors where sticky carryback is a persistent problem.

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2. Why Rubber Disc Return Idlers Prevent Buildup

Material carryback is one of the most persistent problems on the return side of conveyors handling wet or sticky bulk materials. Fine coal particles, clay, and overburden adhere to the belt surface and transfer to return rollers — building up in layers that change roller diameter, create imbalance, and cause belt mistracking. Traditional solid steel return rollers require manual scraping or high-pressure washing.

CEMA D rubber disc return idlers solve this with alternating rubber discs spaced along the roller shaft. Material falls between the discs rather than adhering to a continuous surface, while the rubber disc edges naturally scrape against the belt to dislodge particles. This passive self-cleaning mechanism reduces return-side cleaning labor by up to 70% and prevents the roller diameter changes that cause belt speed variations. For extreme sticky applications, pairing with Belt Cleaners provides comprehensive carryback control.

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3. Key Features

Self-Cleaning Rubber Disc Design — Alternating rubber discs spaced along the roller allow sticky material to fall through, preventing buildup that causes roller imbalance and belt mistracking.

CEMA D Heavy-Duty Rating — 5-inch and 6-inch diameter rubber disc rollers for belt widths up to 72 inches in cement and aggregate return side applications.

Belt-Friendly Rubber Contact — Rubber discs are gentler on the belt cover than steel rollers, reducing return-side wear while maintaining grip to prevent belt slippage.

Advanced Labyrinth Sealing — Multi-stage seals protect bearings from fine dust and moisture in coal and mineral processing environments.

Reduced Maintenance — Eliminates manual return roller scraping, reducing return-side maintenance labor by up to 70%.

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4. Application Scenarios

Wet Coal Handling — Coal fines and moisture in coal handling preparation plants create heavy carryback. Rubber disc idlers prevent buildup without manual cleaning.

Clay & Overburden — Open-pit mining where clay sticks to belts in wet weather, causing severe return roller buildup.

Cement & Aggregate — Dust-laden return belts in cement plants where fine particles create abrasive paste on rollers.

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5. Dimensions – CEMA D Rubber Disc Return

ZOOMRY CEMA D rubber disc return idlers use alternating rubber disc rollers with 5-inch and 6-inch diameters sharing the same frame dimensions. Below are standard specifications for belt widths from 24 to 72 inches:

5" & 6" Rubber Disc Return
BW	A	B	L
24	33	35	27 3/8
30	39	41	33 3/8
36	45	47	39 3/8
42	51	53	45 3/8
48	57	59	51 3/8
54	63	65	57 3/8
60	69	71 1/2	63 3/8
72	81	83 1/2	75 3/8

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