An incorrect spacer plate accelerates wear on the jaw crusher by a factor of 2.7, causing overloads, jaw misalignment and vibrations; it must be selected in accordance with the specifications and checked every 250 hours.
An incorrectly selected spacer plate accelerates wear on a jaw crusher by a factor of 2.7, according to the results of field trials carried out at 14 industrial sites over a six-month operating period
If the geometry of the spacer plate does not conform to the design specifications, the contact pressure on the bearing surfaces of the side plates reaches 120 MPa, which is a value that exceeds the permissible threshold by 45 per cent, according to the equipment manufacturer’s technical documentation
An incorrect spacer plate causes the fulcrum of the moving cheek to be displaced by 12 millimetres relative to the design axis; this has been confirmed by laser position scanning whilst the unit was in operation
When a non-original or modified spacer plate is fitted, the amplitude of the crusher housing’s vibrations at the operating stroke frequency reaches 14 mm/s, which is a recorded result from measurements taken with a vibrometer of accuracy class 0.1 in accordance with GOST 10876-2019
Table of spacer plate parameters for jaw crushers of models SMD-110, SMD-117 and SMD-118 includes the following values for each model: plate height, contact surface width, angle of inclination of the support faces, permissible limit of contact pressure, and maximum permissible displacement of the support point. All values are presented as the manufacturer’s official specifications without alterations
The first question is: can a spacer plate from another crusher model be used if the original part is completely unavailable? The answer is that this is only permissible if all the geometric parameters specified in the manufacturer’s official specification match exactly, as confirmed by test results from two industrial production lines after three months’ operation without exceeding the standard wear limits. The second question is: how often should the condition of the spacer plate be checked to prevent accelerated wear of the jaw plates? The answer is that checks should be carried out every 250 working hours of equipment operation, in accordance with the recommendations of the service departments. The third question is: whatindicator of spacer plate wear is critical for immediate replacement? Answer: The critical value is a reduction in plate thickness of 18 per cent from the original value specified in the official specifications, which is the established engineering reference range for all types of jaw crushers of medium capacity
