Jaw crusher BB 50

cyclonelaboratorysample

Product description
The BB 50 is the smallest model of the RETSCH jaw crusher series, designed for laboratory sample preparation. The compact forced-feed crusher fits on a laboratory bench and is intended for batchwise processing of small sample quantities or continuous operation for larger throughputs.

Features

• Feed size up to 40 mm; achievable final fineness down to 0.5 mm
• Removable breaking jaw for tool-free cleaning
• Adjustable speed to match sample characteristics
• Wear compensation via zero-point adjustment
• Operating keypad with digital display and memory for gap setting
• Dust-tight design; collector capacity 3 L

Easy operation & cleaning
The clear operating panel displays gap width and speed. The large hopper with splash-back protection enables safe feeding. Fold-back hopper and crusher arm are removable without tools for fast cleaning and jaw exchange to adapt to different applications.

Zero Point Adjustment
Zero-point adjustment compensates wear of the breaking jaws. A display indicator signals when jaw replacement is required, preventing damage to the crusher.

Cyclone System for Jaw Crushers
RETSCH offers a retrofit Cyclone System to improve sample recovery and operator safety.

• Total Sample Recovery — Minimises sample loss during crushing for reproducible results
• Enhanced Operator Safety — Reduces dust exposure

Existing BB models (BB 50, BB 250, BB 400, BB 500) can be retrofitted with the Cyclone System.

Accessories
Breaking jaws and wear plates are available in materials chosen according to sample and analysis:

• Manganese steel
• Stainless steel
• Tungsten carbide
• Zirconium oxide
• Steel (1.1750) for heavy-metal free grinding

The optional lid for the collecting receptacle prevents cross-contamination by avoiding transfer of fine residues between samples.

Typical Sample Materials
Suitable for pre-crushing construction materials, ores, granite, oxide ceramics, quartz, slag, silicon, coal, tungsten alloys, cement clinker, etc.

Functional principle
The BB 50 is a forced-feed jaw crusher: material enters via a no-rebound hopper into the crushing chamber. Size reduction occurs between a fixed and an eccentrically driven movable arm; elliptical motion crushes the sample which discharges by gravity when smaller than the set gap. Continuous gap width setting with digital display enables reproducible size reduction.

Technical specifications

• Applications: coarse and pre-crushing
• Fields: agriculture; biology; construction materials; geology/metallurgy; glass/ceramics; medicine/pharmaceuticals
• Feed material: medium-hard, hard, brittle, tough
• Size reduction principle: pressure
• Maximum feed size*: < 40 mm
• Final fineness*: < 0.5 mm
• Throughput*: 3 L/batch
• Grinding tool materials: manganese steel; stainless steel; tungsten carbide; zirconium oxide; steel 1.1750
• Jaw width: 45 x 59 mm
• Gap width setting: 0 – 11 mm (increments 0.1 mm)
• Gap display: digital
• Zero point adjustment: yes
• Reverse rotation: yes
• Hinged hopper: yes
• Dust extraction: dust-tight
• Central lubrication: lifetime lubrication by manufacturer
• Process line: possible by removing drawer
• Collector capacity: 3 L
• Drive: 3-phase motor with frequency converter
• Drive power: 1.1 kW
• Power connection: 1-phase (different voltages available)
• Protection code: IP 20 / IP 00 at ventilation slots
• Dimensions (W x H x D) closed: 420 x 460 x 560 mm
• Net weight: ~ 79 kg
• Standards: CE
• Note: *depending on feed material and instrument configuration/settings