vibrations of crank drives

Description:

• Crank drives are frequently used in compressors and pumps.
• They cause vibration due to the oscillating masses and forces.
• Under the alternating stress in the drive mechanism, bearing clearance, for example, can generate shock impacts with high-frequency exciter spectra.
• In addition, free mass forces generate harmonic vibrations due to their non-linear kinematics.
• The PT 500.16accessory set enables the stroke, mass balance and bearing clearance on the crosshead to be adjusted.
• The speed is adjusted using the base unit PT 500.
• Gas forces such as occur in compressors or combustion engines can be simulated using springs.
• Experiments with gas forces require higher torques which are attained by reducing the speed of the drive motor from the base unit PT 500.
• reduction is achieved either with the PT 500.14belt drive or the PT 500.15 gear unit.
• The transmission of alternating torque in toothed gearing mechanisms can be investigated together with accessory set PT 500.15(for investigating damage to gears).
• The accessory set is mounted on the base plate of the machinery diagnostic base system PT 500.
• To measure and evaluate the experiment, the computerised vibration analyser PT 500.04is required.
• It includes all the necessary sensors, a measuring amplifier and analysis software to record the vibration phenomena.

Technical Details:

Specification:

• investigation of the vibrations of crank drives
• crank drive with adjustable stroke
• interchangeable bearing bushes permit simulation of bearing clearance
• springs simulate gas forces
• can be used together with gear damage accessory set PT 500.15
• belt drive PT 500.14 or gear unit PT 500.15 required for experiment with gas forces
• accessory set for PT 500 machinery diagnostic training system
• stackable storage system to house the components

Technical Data:

• Stroke: 50 – 75 – 100mm
• Balance mass total:
  • 490g, rated for operation with 50mm stroke
• Bearing clearance: 0…1mm
• Pressure spring:
  • relaxed length: 170mm
  • spring stiffness: R=0,55N/mm

Dimensions & Weight:

• L x W x H: 600x400x170mm (storage system)
• Weight: approx. 8kg

Learning Objectives/Experiments:

• experimental modal analysis of mechanical systems
• familiarisation with the envelope analysis
• influence of bearing clearance and shock impact
• inconsistent torque characteristic
• wear measurement on piston rods
• understanding and interpreting frequency spectra
• use of a computerised vibration analyser
• in conjunction with PT 500.15:
• transmission of alternating torque in toothed gearing mechanisms
• in conjunction with PT 500.14 or PT500.15:
• influence of gas forces on the vibration spectrum

Scope of Delivery:

• 1 crank drive
• 2 springs
• 2 balance masses
• 1 set of tools
• 1 storage system with foam inlay
• 1 manual

Features:

• vibrations of crank drives
• bearing clearance or slack in oscillating machine components

Accessories:

• Required:
• PT 500 Machinery diagnostic system, base unit
• Optional:
• PT 500.14 Belt drive kit
• PT 500.15 Damage to gears kit

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.