A hydraulic power unit operating a rock-crushing machine had erratic pressure problems, causing the crusher to stall when the pressure seemed to relieve at a lower pressure than needed. The machine was over 30 years old and was somewhat quite simple in design.Get A Quote
The circuit attached shows the main relief valve remotely controlled so the operator could reverse the motors rotation with the directional valve and adjust the pressure higher than normal to clear jambs. Once the jamb was cleared, he would reset the pressure back to the normal setting and shift the directional valve back to rotate the crusher motor in the normal operational direction.
They determined that the remote control relief valve was worn badly and needed to be replaced. Their storeroom had the same brand of relief with the same spring range, but with just one letter difference in the model number. They installed it in the manifold, adjusted the valve from fully open to the number of turns closed used by the old, similar valve with the same spring rating, and then started the system up. It seemed to run fine until the crusher jammed and blew the side of the pump out. Luckily, no one got hurt.
The gold mine power unit where the side of the pump blew out had a relief valve installed that had the inlet and outlet reversed, taking the pilot relief out of the circuit. Without a drain, the main relief would not open, causing an unwanted pressure spike that blew the side out of the pump. Sun, Parker, and Eaton all over the years have produced relief valves where the pressure inlet comes into the side and out the bottoms, as well as units that have the inlet in the bottom and out the side.
Tagged circuit, directional valves, figure it out, hydraulic power unit, teaser.
It is possible that the replacement valve was installed backwards, or in the case of a cartridge type valve the porting was reversed. In either case there was no relief protection so pressure reached an unsafe level until something failed.
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On the collection level, the ore is crushed using a cone crusher. The ore is then moved by conveyor belts to the shaft to be hoisted to the surface in buckets or skips and emptied into bins for transport to a mill. One of the hydraulic systems used on the hoist operates a conveyor motor and cylinder circuits as shown in the drawing.
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According to the survey, people usually adopt jaw crusher for primary crushing in gold plant. And then, adopt cone crusher and impact crusher for secondary crushing and fine crushing. In order to increase the production capacity, we need to adopt efficient gold production equipment and improve the processing technology.
PEW series jaw crusher is common gold ore primary crushing equipment. It is designed based on the traditional jaw crusher. It is suitable to process all kinds of medium-grained into small pieces. It is often associated with cone crusher, grinding mill and other equipment to form a complete gold ore processing line. Its structure is stable and reliable, so the performance of it is quite outstanding. The crushing chamber of it adopts a quotVquot-type structure, which effectively increasing the crushing area and improving the crushing rate and yield.
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