Engineering & Technical Solution

Double Tooth Roll Crusher for Coal Gangue Processing

Tailored for large feed size and high moisture, providing high reduction ratio and low maintenance cost.

1. Identifying Operational Challenges of Double Tooth Roll Crusher in Coal Gangue Crushing

Double Tooth Roll Crusher is the ideal solution for handling run-of-mine coal gangue. Coal gangue extracted from mines exhibits a wide particle size distribution, with maximum edge length often reaching 800–1000 mm, and is frequently mixed with tramp iron, wood chips, and other debris. Conventional jaw or hammer crushers handling such large gangue blocks are prone to chamber jamming, material fly-out, and tooth plate breakage, while producing excessive fines that hinder downstream jigging separation. This double tooth roll crusher accepts feed sizes from 80 mm up to 1050 mm. Through differential‑speed shearing between the two rolls, it reduces large gangue blocks to below 50 mm in a single pass with minimal over‑crushing, while allowing tramp iron to pass safely.

Coal Gangue Double Tooth Roll Crusher

2. Customized Engineering Implementation Process

Step 1 – Lump Size & Debris Analysis
Measure the maximum feed size, average lump dimension, and content of tramp materials (iron pieces, wood) at the customer’s site to determine the feed opening width and roll diameter for the Double Tooth Roll Crusher.

Step 2 – Tooth Profile & Crushing Cavity Design
For 1000‑mm‑class lumps, adopt large wolf teeth with helical tooth arrangement to center the material automatically inside the crushing cavity of the Double Tooth Roll Crusher, avoiding uneven load and roll jamming. Install a splash‑proof baffle above the crushing chamber.

Step 3 – Feeding & Discharge Matching
Customize an enlarged feed hopper according to the width of the upstream mine car or apron feeder to ensure large lumps fall smoothly between the rolls. Equip the discharge opening with wear‑resistant liners to guide crushed material evenly onto the belt conveyor, maximizing the efficiency of your Double Tooth Roll Crusher.

Coal Gangue Double Tooth Roll Crusher Crushing Site

3. Core Technical Features

✔ Extra‑Large Feed Capacity – Feed opening width customised to the customer’s maximum lump size, accepting feed range from 80 mm to 1050 mm – covering the typical lumpiness of coal gangue.
✔ Self‑Relieving Roll Design – Rolls are supported by spring or hydraulic floating mechanisms. When an uncrushable object enters, the roll gap temporarily widens to prevent jamming or tooth breakage.
✔ Low Fines Generation – Shearing‑dominated action (supplemented by compression) keeps -6 mm fine powder below 15%, preserving particle strength for effective layering and separation in downstream jigging.
✔ Segmented Roll Discs – Each roll is assembled from individual, interchangeable disc segments. Worn discs can be replaced on site without lifting the entire roll assembly.