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1、Page: 11ReservoirPumpPumpComponents descriptionY1, Y3, Y5, Y7 are called pressure valvesY2, Y4, Y6, Y8 are called pressure relief valvesElectrically actuatedComponents descriptionY1, Y3, Y5, Y7 are called pressure valvesDe-energized, normal openenergized, valves closedComponents descriptionDe-energi
2、zed, normal closedenergized, valves openY2, Y4, Y6, Y8 are called pressure relief valvesComponents descriptionNo-load start up operation By starting command fromthe control panel.All valves are de-energizedand the pumps start runningThe pumps deliver oil pressurelessinto the reservoir, via the filte
3、rs andthe pressure valves Y1, Y3, Y5, and Y7When the mill has been at a standstillfor 2 to 4 hours, but just once per 24 hours,the pistons of the hydraulic cylinders are drawn into their end positions (alternately always 2 x),in order to ensure an exchange of oil in the area of the seals.In all othe
4、r cases, the starting procedure begins with pressurizationto the start-up pressure.No-load start up operation By activating the pressure valve Y1and the pressure relief valve Y6and switching on the pump 1The oil stream flows through the filter.through the non return-valvePressure valve Y1 is closed
5、in energized conditionPressure valve leaded byTVPressure relief valve Y2 is closedin de-energized conditionThe oil stream flows to the piston rod side of the cylinder,the piston moves downwardsThe piston of the other cylinder,corresponding to the same roller pair, moves upwardsno-return valvePressur
6、e relief valve Y6 is open,in energized conditionMinimal pressure limiting valve,manual adjustableThe oil from the hydraulic cilinderflows back into the reservoirNo-load start up operation Exchange of oil in the cylinders ofthe bucket elevator sideWhen the upper end position of the piston in thehydra
7、ulic cylinder I, or the lower end position in the cylinder II,.indicated by the ultrasonic measuring devices,has been reached,.the pressure valve Y1 andthe relief pressure valve Y6are de-energizedII III IStarting procedure 1Pressurizing all the cylinders to the starting pressure.2Balancing of the ro
8、ller pair units by means of the ultrasonic measuring devices.3After the mill main drive has been running for approx. 1 minute (adjustable, one complet table turn) pressurizing to working pressure.Release for starting the mill1Pressurizing all the cylinders to the starting pressure.Before the main dr
9、ive starts running, the cylinders must be pressurized to a lower value than the working pressure,in order to reduce the required starting torque.Pressurizing to starting pressure All the pressure valves Y1, Y3, Y5, Y7and the pressure relief valves Y2, Y4, Y6, Y8 are energizedThe pumps are running an
10、d.The hydraulic cylinders are pressurizedto the pressure value set at thepressure relief valves Y2,Y4,Y6 and Y82The measured values of the ultrasonic measuring devices are compared. If the difference betweenthe working side and the fixed side of one roller pair unit is greater than 50 mm, the hydrau
11、lic cylinders are balanced.Balancing of the roller pair units by means of the ultrasonic measuring devices.Balancing of the roller pairs units II III IThe measured values of the ultrasonicmeasuring devices are comparedIf the measured value at the cylinder Iis more than 50 mm greater than the measure
12、d value at the cylinder II.relief valve Y5 and pressure valve Y2are energizedI I IBalancing of the roller pairs units II III IIf the measured value at cylinder IIis more than 50 mm greater thanthe measured value at cylinder I. II II II.relief valve Y1 andpressure valve Y6 are energizedThe balancing
13、process is terminatedwhen the differences of the measured valuesbetween the respective ultrasonic measurement devicesare smaller than 50 mm.Balancing of the roller pairs units The rotation of the grinding table determinesthe fixed and the working sidesWorking sideWorking sideFixed sideFixed sideThre
14、e limit switches control the working side rods position3The fixed sides will be pressurized to the working pressure.By pressurizing the fixed sides, the piston rods of the working sides are drawn upwards.Then, the working sides will be pressurizedby being drawn downwards till the central limit switc
15、hes are reached . Pressurizing to the working pressure.Pressurizing to the working pressureAfter the main drive has beenrunning for approx. 1 minute.the pump A is switched onand 10 s later, the pressure valvesY1 and Y3 are activatedWorkingpressureWorkingpressureWhen the limit values of pressure are
16、reached, the pump is switched off,an the valves are de-energizedABPressurizing to the working pressureBy pressurizing the fixed sidesto the working pressure.the piston rods of the working sidesare drawn towards the limit switchesI“ and IV“ IIVBAWhen the limit switches I“ and IV“are reached, the pump
17、 B“ is startedand the valves Y5“ and Y7“are energized Pressurizing to the working pressureBAWhen the central limit switchesII“ and V“ are reached,.IIVand the valves Y5“ and Y7“are energized The piston rods are drawntowardsthe limit switches II“ and V“.the pump B“ is switched offand the pressure valv
18、es Y5“ and Y7“ are de-energized Mill in operationIBADuring the mill operation, the roller pair units are continuously balancedand the working pressureat the fixed sides controlledWhen limit switch I“ is reached,pump B“ is started andY5“ energizedWhen limit switch II“ is reachedY5“ is de-energized an
19、d pump B“is switched offIIWhen limit switch III“ is reached, pressure relief valve Y6“is energizedIIIand the pressure in the cylinderis reduced until limit switch II“responds againIIMill in operationBAIf the working pressure at the bucket elevator fixed sidedrops below an adjustable MIN valuePump A“ is startedand pressure valve Y1“ is energizeduntil the MAX valueis reached
