MAINTENANCE OF TEXTILE MACHINERY

Submitted by:MOFIZUR RAHAMAN AKASHJAHIRUL ISLAM SAIFULDepartment of Textile EngineeringWorld University Of Bangladesh (WUB)Semester: 11th

Submitted To:Mr. Joy Sarkar LecturerDepartment of Textile EngineeringWorld University Of Bangladesh (WUB)2013

DEFINATION OF MAINTENANCE Maintenance may be defined as the process of systematic activities done for keeping the m\c or equipments at the heat level for well run or its proper services.

History of maintenance

AIMS of MAINTENANCE To maintain m\c equipment at optimum operation speed & production efficiency To ensure best possible level of quality of product. To minimize the idle time resulting from the machinery break down. To reduce the cost.

IMPORTANCE of MAINTENANCE To increase the life time cycle of machinery & equipment In case of appropriate functioning. Better or superior quality for the product. Higher productivity of machines Wastage reduces & control. Economization of the process.

EFFECTS of MAINTENANCE Due to proper maintenance reduce undue worn out of different parts & equipment as well as corrosion of the items & increase the machines life ( these are the result of routine cleaning, lubricating, repairing, replacement, fitting, & refitting etc.) For sound operation of machinery, it is required the proper lubrication, fitting, repairing, & replacement (as per necessity). By the continuous operation of the machinery reduces stoppages time resulting better quality & less wastage

OPERATION INVOLVED in MAINTENANCE SettingCheckingRepairingOverhauling

SYSTEM of MAINTENANCE Basically there exist 2 systems on which based different types of maintenance are done. They are: Break down maintenance Planned maintenance.

TYPES of MAINTENANCE Preventive maintenance. Productive maintenance. Routine\schedule maintenance. (cleaning,checking, lubricating) Remedial maintenance. Restorative maintenance\emergency maintenance.

POWER TRANSMISSION Power may be transmitted in the following ways. They are: By mechanical means By electrical means By electro-mechanical means By hydraulic means Others (aeronautics)

In them the mechanical means transmission is classified in following Through belt & pulley (Flat belt & flat pulley) (V-belt& V-pulley) (Timing belt & Timing pulley) Through gears (Straight gears such as Spur gearing) (Epicyclical gearings) Through chain-sprocket

LUBRICANTS 2 types of lubricant on the basis of viscosity Oil Grease

EFFECT of LUBRUCANT Corrosion (anti corrosion effectiveness) Uniformity & optimum speed attainment Recommended legibility of the spares & parts High efficiency (due to low break down stoppage of the material) Higher quality of the product Low work load on the work arm Less material handling

SYSTEM & PROCEDURE of MAINTENANCE For effective maintenance a no. of pre-requirement site have to met There must be a well defined organizational structure to & implement the program. Proper planning, scheduling & controlling of maintenance must be designed. An appropriate flow of information & data on maintenance must be devised. Timely supply of the spare parts & also other materials needed must be ensured. Personnel of varying skilled & competence must be engaged.

WHAT ARE THE SYSTEM & PROCEDURE of MAINTENANCE? The answer will depend on the aspects emphasized. It may be of two natures: Management aspectsTechnical aspects In managerial aspects, system may be defined as the means which the personnel of an enterprise operate to accomplish the enterprise objects. They provide the means of translating managerial policies. Procedure will be that they are written & oral instruction which give formal sanction to a system.

SCHEMATIC DIAGRAM of MAINTENANCE ACTIVITIES DEPENDING on THEIR UNCERTAINITY LEVEL

There the things are shown below: Repetitive: Routine maintenancePreventive maintenanceStatuary maintenanceNon-repetitive:Major repairingErective maintenanceRe-erective maintenance Overhauling maintenance

Unknown: Corrective action to be taken on the basis of the preventive maintenance.Emergency maintenance Re-storative maintenance Change of lay out.

STEPS of MAINTENANCE The steps of maintenance are:PlanningSchedulingControlling

RECORDS FOR THE EFFECTIVE MAINTENANCE CONTROLLING 1)Maintenance ledger 2) M/c cards 3) Job in complete report 4) Lubricant control chart 5) Over time requisition form 6) Weekly work order sheet 7) Maintenance chart 8) Mechanical down time 9) Break-down time 10) Over time engagement record 11) Monthly spares & lubricant consumptions.

ELEMENTS of MAINTENANCE 1) Inspection / check up2) Lubrication 3) Planning & scheduling 4) Training 5) Recording & analysis

TYPES of LUBRICANT Lubricant can be classified broadly on their viscosity & sp viscosity Grease higher viscosity & lower fluidity Oil lower viscosity & higher fluidity

CHARACTERISTIC of LUBRICANT Viscosity Sp. gravity Flash point Pour point CST(Centistroke)Volatility Acid no of parts per million (ppm)

SELECTION of LUBRICANT Selection of lubricant is governed by following factors Types of gear/bearing or point of lubricants Speed of gears/shaft (in case of seal box of gear) Reduction ratio Operating temperature Input horse power Nature of load provided

FUNCTIONAL PROPERTIES of LUBRICANT Outcome from the physical properties Lubricant must be resist oxidation Lubricant must be resist carbon formation Lubricant must be resist rust formation Lubricant must anti-foaming Lubricant must be resist extreme load Lubricant must possess required viscosity Lubricant must act goods cleaning agent (CCl4, petrol, diesel)

MAINTENANCE SCHEDULE Factor must be considered for maintenance schedule: M/C type (mechanical, electrical, mechatronics basis) Danger level/Risk level Operational tenure (operational period round the clock/ shift basis/weekly/occasional) Nature of the equipment Availability of man power & skilled Expenditure

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