Penner & Lewis Rock Technologies Ltd.

Design Considerations

Here are some considerations for you to think about when purchasing chassis’ for portable crushers and screening plants:

Crusher and Screen Chassis Design Considerations

Cost/Problem Or Benefit

Do the axle and kingpin weights allow you to move it without permits in your province, or even with permits?

  • Don’t forget axle spacing & tire size regulations.
  • Don’t forget to consider weight of power cables, oils and dirt.
  • Is there room for a jeep or dolly at the kingpin?
Improper chassis weight distribution requires components to be removed = longer demobilization times = loss of time/production. Proper weight distribution speeds set-up and teardown time = more production uptime.
Does the design allow for quick dismantling to meet dimensional (transport) requirements? Catwalk removal is a common requirement. Advanced designs eliminate this with hydraulics or fold-down designs. Hydraulic cylinders for leveling or moving & folding on-plant conveyors improve operator safety & speeds mob/demobilization.
Is there adequate safety equipment to meet your local authorities’ requirements? (Example: zero speed switches on conveyors.)Note! Fall arrest and confined space regulations are coming. Inadequate safety features increase owner liability, and also increase costs and downtime to comply. A safe chassis helps to set an owner’s expectations for employees to work safely.
Is the design maintenance-friendly?  For example, are grease points, take-ups, and gauges accessible? Are there platforms in key areas? (Example: around hydraulic consoles and coolers.) If maintenance procedures are not followed properly because of poor access then premature failure results = unscheduled downtime. Good (safe & quick) access helps ensure proper maintenance practices will be followed.
Are safety guards easily removable, allowing them to be replaced quickly? Are they sturdily built?  Do their designs meet your local standards? (Example: proper colour.) If guard designs are poor, they typically are left off the plant, increasing owner liability & endangering workers.
Are transfer points well designed? Is conveyor flashing of modern design? Are chutes and hoppers lined? Premature wear in flashing, chutes and hoppers reduces uptime and can cause safety problems and allow dirt & dust to wear components. Well-designed flashing minimizes maintenance and reduces labour for cleanup. Liners reduce maintenance time.
Paint quality impacts maintenance, operation and of course resale value. Premature aging causes loss in pride of ownership by plant operators = less maintenance. Good quality paint (e.g. epoxies) pay for themselves many times over.
Are manuals available? Are they comprehensive? Lack of manuals increases safety concerns for operators. Good quality manuals ensure you can identify and find replacement parts quickly.
Are safety notices/signs/stickers adequate? Achieving compliance on site comes with an annoying cost. Proper notice reduces the owner’s liability and improves worker safety.
Are lubrication lines and electrical cables adequately protected at wear points? This is a safety issue and increases the risk of catastrophic failure.
Are blocking legs well designed and adequate? Premature chassis failure will result from inadequate blocking – because of design and/or poor blocking practice. Proper hardwood blocking practices including daily checks pay superior dividends in maintaining chassis integrity.

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