On a 11-6 x 22-0 Ball Mill, thetrunnion bearing lubrication system provides continuous low pressure flood oil for cooling and lubrication of the bearings, and high pressure oil for hydrostatic lift of the feed and discharge trunnions during start-up of the mill. System monitors including pressure switches and flow monitors are provided, along with temperature sensors that monitor the condition of the lube system. The signals from any of these monitors will alarm or trip the system depending on the deviation from the operating parameters.
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The ball mill8217slow pressure oil system pumps oil from the reservoir through a filter assembly to clean the oil before the flow is sent to the trunnion bearings. During start-up, the oil is also pumped to the high pressure pump. Dual cartridge filters, connected in parallel, continually clean the oil. The duplexconfiguration of the filters allows for uninterrupted operation of the mill during filter cartridge replacement and maintenance. Flow monitors in the trunnion bearing supply lines monitor oil flow to the bearings and will alarm and trip the mill is low flow is indicated.
The ball mill8217s high pressure oil system is designed to lift the trunnions during start-up by supplying high pressure oil. The high pressure pump is programmed to shut-down after the mill has been running for a predetermined amount of time.The high pressure pump pumps oil through the high pressure supply lines to the trunnion bearings. Pressure transmitters in the high pressure oil supply lines monitor the supply of oil to the bearings and provide interlock signals for mill operation to the control system.
The breakaway pressure is influenced by the amount of residual oil present in the trunnion bearings. Pressure can vary by as much as 3000 psi 207 bar between a dry bearing and a bearing that had just operated. Start-up may have to be delayed to allow the weight of the mill to squeeze out excessive oil and achieve enough back pressure to satisfy the PSH. PSH setpoint must be set between breakaway pressure and floating pressure.
The instrumentation must be calibrated before starting the mill. The easiest and safest way to adjust the instrumentation is to very carefully monitor all bearing temperatures during start-up and under normal grinding conditions. Adjust the individual set points for each bearing 10F5.5C higher than the stabilized temperature for 8220alarm8221, and 15F8C for 8220shut down8221.
Jan 14, 2019nbsp018332The effectiveness of normal lubrication protection is reduced when the mill is shut down for any length of time, and many mills are fitted with manually operated hydraulic starting lubricators, which force oil between the trunnion and trunnion bearing, preventing friction damage to the beating surface, on starting, by re-establishing the.
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5 In operation, the crusher should always check the lubrication point of the lubrication is good, and pay attention to the bearing temperature, under normal circumstances, the bearing temperature can not exceed 60 , such as bearing temperature over 60 , should immediately stop the inspection to find out Causes and take corresponding.
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