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IRS POINT MACHINE IRS POINT MACHINE is rotary locking type point machine and designed to comply with IRS specification S-24/2000 and RDSO Dr.No.S10.800.

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Presentation on theme: "IRS POINT MACHINE IRS POINT MACHINE is rotary locking type point machine and designed to comply with IRS specification S-24/2000 and RDSO Dr.No.S10.800."— Presentation transcript:

1 IRS POINT MACHINE IRS POINT MACHINE is rotary locking type point machine and designed to comply with IRS specification S-24/2000 and RDSO Dr.No.S it is designed operate all type of points /switches. It is available in two model low stroke (143mm) and high stroke (220mm) It is non-trailable type point machine

2 SrNobDescriptionremark 1Type D.C. high thrust (stroke 143mm) 2 Other model High stroke 220mm 3 Type of Locking Rotary type 4 Locking of switches Independent (two lock slides) 5 Arrangement for Locking of switches Indirect through ground connections (rods) in side machine 6Thrust 700 Kg 7 Over load protection Friction clutch self adjustable 8SnubbingMechanical 9 Locking of throw Available 10 Number of control contact Number of detection contact Greasing nipple 11 13weight 220 Kg 14packing Wooden skeleton 15 Number of ground connections Five (02 lock+ 02 detection + 01 through) Important feature

3 General Features of point machine  The basic design of point machine generally comprises of  Cast iron casing and cover with locking arrangement  Motor  Reduction gear  Crank handle mechanism  Friction clutch  Contact assembly with spring loaded rollers and Detection slides  Rotary to linear conversion mechanism  Locking and throw assembly

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5 Cast iron case  accommodates all the parts of point machine  is made of cast iron and designed to fix all parts at required place.  provide access to/ slots for different lock and detection slides  facilitate fixing of machine on sleepers  Provides an arrangement to drain out water/ oil in bottom of casting.  Provides cable entry.

6 Cast iron case

7 COVER OF POINT MACHINE  Made up of thick iron sheet and fixed on cast iron casting (case)  Contain lock ( S&T maintainer's lock) on inner side surface to lock it with cast iron casting (case).  Secure all the parts of machine in weather proof environment and prevents un-authorosed interference.  Provides access only to nominated (ward &feather) crank handle insertion.  All the apertures for keys and crank handle are secured by flaps  All flaps has a locking arrangement

8 COVER OF POINT MACHINE Cover top view Cover inner view lock Flap For Crank handle Flap For Cover key Flap for crank handle key

9 MOTOR  DC motor IRS: S 37 Motors for Electric Point Machine.  shall comply with the requirements of IRS: S 37 'Motor for Electric Point machine.  Motor comprises of 1. crank handle cutout contact assembly, 2. DC motor 3. reduction gear

10 CRANK HANDLE AND CRANK HANDLE MECHANISM  It allows Manual operation (without power) of point  It require in case of failures of point/ point machine OR for the purpose of maintenance of point machine.  It contain 1.CRANK HANDLE AND KEY 2.CRANK HANDLE CUTOUT CONTACT ASSEMBLY

11 CRANK HANDLE This apparatus is used for manual operation of point machine It is a “Z” shape structure made of steel pipe and has wooden handle on one end to have better gripe. Wards &feathers are welded on other end of pipe facilitates coding (insertion of only to nominated crank handle). A stud is intrude in the pipe, it get engage in forked shaft of motor Crank handle Wooden handle Ward & feather

12 CRANK HANDLE CUTOUT CONTACT ASSEMBLY  It disallows simultaneous power and manual operation of point machine to protect staff performing crank handling.  Ordinarily crank handle can not be inserted in machine  Turing of crank handle key permits/ allows insertion of crank handle in the machine.  Turning of crank handle key isolates the negative power path of motor.  It comprise of 1.Crank handle cutout contacts 2. flap cover plate 3.Crank handle key

13 Crank handle cutout contacts  There are two sets of contact  These contacts are wired in negative path of power supply to motor.  Contacts break / open with insertion and turning of crank handle key  Makes when crank handle key is taken out Crank handle contact closed & Flap in front of shaft Crank handle contact open &Flap displaced & shaft visible

14 Flap cover plate & key  controls the entry of crank handle in the machine for manual operation  metal flaps attached to a lock  hangs/ placed in front of motor shaft at the entry point of crank handle.  flap cover plate is displaced by means of a crank handle key  The insertion and turning of crank handle key  displace the flap cover plate to allow insertion of crank handle  open crank handle cutout contacts.  Removal of the crank handle key  replaces flap cover in front of motor shaft  makes the crank handle contact. Crank handle key

15 Flap cover plate and crank handle key Crank handle insertion Insertion & turning of key displaces flap Cover plate Flap cover plate in front of crank handle Entry & shaft of motor

16 DC motor  is a series split field DC motor  Is design to work on 110volt DC  Is a series motor to meet high initial torque requirement  Is split field so that motor can be rotated in both direction  contains four field windings and two windings are connected in series to form a set of winding.  Use carbon brushes

17 SrNobDescriptionRemarks1Type D.C. Series split field 2 Operating voltage 110 Volt DC (60 volt mini) 3current 2 to 2.5 Amps 4Thrust 700 Kg 5Power0.48KWt 6 Reduction ratio (in side motor) 20.8 :1 7 AC immunity 160, 300, 400 volts 8 Power supply terminals 03 9 Insulation grade of windings More than 10 M Ohms Technical parameters of motor Technical parameters of motor

18 DC MOTOR main parts  Armature and commutator  Field winding  Carbon brushes  Motor body  Groove for crank handle

19 DC motor Pinion RecRec Reduction Gear Power Terminal Commutator & brush

20 Armature and commutator Function of armature  To carry current crossing the field thus creating shaft toque  To generate an electromotive force Function of Commutator  Reverse the current in moving coil of motor’s armature and generate a steady rotating force (torque)

21 Field winding The function of the field winding create magnetic field for armature  motor contains four field windings  two windings are connected in series to form a set of winding.  one set of winding rotate motor clockwise and other set of winding rotate motor anticlockwise direction

22 Carbon brushes Brush is rectangular carbon block and spring loaded in holder Brush provides the electric connectivity between field windings and rotating commutator the holders should be mounted a maximum of.125" above the contact surface. Proper functioning of the holder depend upon, Inside holder dimensions Inside holder dimensions equally Holder spacing equally Holder spacing Holder angle (20 to 30 deg.) Holder angle (20 to 30 deg.) Holder height Holder height Spring force ( PSI) Spring force ( PSI) Electrical connections Electrical connections Carbon brush

23 Reduction gear  It is trail of gears which provides reduction ratio 20.8:1 Number of teeth on driver Number of teeth on driver  Reduction Ratio = Number of teeth on drive Number of teeth on drive  Reduction ratio provides a torque-speed conversion from a higher speed motor to a slower but more forceful output.  Motor rotate at very high speed and Load can not be directly placed on motor shaft.  Appropriate reduction gear ratio is used  to get require mechanical advantage/ thrust  to syncronised various functions  to change direction of rotation  to get desire power as

24 Reduction Gear pinion Hover flow pipe Oil entry

25 Friction Clutch  Friction clutch is an assembly of spring loaded Gear, shaft and disks which are placed between motor and Load (point throw / transmission assembly).  Functions of friction clutch are To protect the motor from overload To protect the motor from overload To achieve mechanical (dynamic) snubbing To achieve mechanical (dynamic) snubbing To follow the sequence of point operation. To follow the sequence of point operation.

26 Transmission assembly pinionpinion Lock segmentLock segment Drive discDrive disc GearrimGearrim sliprimsliprim Liftout discLiftout disc Control discControl disc

27 Feature of friction clutch  The friction clutch designed to  extend stroke (force) from motor to load (point) if load is within Specified limit (700 Kg)  de-clutch (separate) motor and Load (point) if load is more Specified limit (700 Kg).  De-clutching of friction clutch can be adjusted to suite Specified limit of load (700 Kg) by loosening Or tightening spring.  Friction clutch require / needs an adjustment if  slipping current /obstruction current shall not be more than 1.6 to 2 times of normal working current  difference between normal working current and slipping current /obstruction current is less than 0.5 Amps.  The friction clutch shall adjusted in workshop only (not at site).

28 Parts of friction clutch Friction clutch comprises of Control disc Control disc Lift out disc Lift out disc Drive disc Drive disc Gear rim and slip rim Gear rim and slip rim Shoe expansion (locking plate) Shoe expansion (locking plate) Helical spring Helical spring

29 Sequence of rotation of gear &disc How different gear and disc rotate in side friction clutch Pinion of motor rotates Gear rim, then Gear rim rotates slip rim then slip rim rotates shoe expansion, then shoe rotates lift out disc and drive disc, then d.disc rotate drive disc, then d.disc rotate control disc and shaft with pinion & lock pawl

30 Control disc It is a circular disc with notch on outer periphery Edges of notch are vertical Function of control disc are Allow the top roller (roller A) to fall in side respective notch at end friction clutch rotation Prevent upward movement of top roller (lock the top roller) Control disc inner view Control disc outer view Notch for top roller Studs for non trail able block

31 Lift out disc It is circular disc with notch on outer periphery. It has notch on inner periphery also which engages with shoe expansion. It has two grooves which are fill with grease & fitted with two grease nipples. It is first disc to rotate in friction clutch. Function To lift the top roller (roller A) to open detection contacts at beginning of point operation To lift the top roller (roller A) to open detection contacts at beginning of point operation Inner view Outer view Grease Nipple Notch on outer periphery Notch on inner periphery

32 Drive Disc Drive disc is a Thick circular disc & has Drive disc is a Thick circular disc & has Two projections on outer and inner periphery. A shaft keyed in the center Lock pawl and pinion fixed on one end of shaft Lock pawl and pinion fixed at180 degree opposite A circular offset on outer periphery on which gear rim rests Two studs which engaged with non trailable block. A Small window to have access to friction clutch adjustment nut.

33 Projections on Inner periphery Window Projection on outer periphery pinion Lock pawl Locking face For throw slid Locking face For lock slids Circular groove For gear rim Shaft

34 Functions of Drive Disc  Extend movement to shaft hence rotate pinion and lock pawl.  Restrict rotary movement to 270° and provide subbing  Hold gear rim on outer periphery  Convert rotary movement in to linear movement

35 Gear rim & spring loaded slip rim It is main part of friction clutch where rotary movement of motor is extended to other parts of machine Overload protection to motor achieved Snubbing is achieved The main parts are Gear rim Slip rim Shoe expansion with helical spring

36 GEAR RIM & SPRING LOADED SLIP RIM Shoe expansion Helical spring gear rim slip rim

37 Gear Rim A circular gear having 92 teeth on it’s outer periphery It engages with pinion of the Motor It Accommodate slip rim and spring loaded shoe expansion. When rotated by motor It transmits rotary motion to shoe expansion through slip rim

38 Slip rim It is semicircular rim with grips on it’s outer surface. It’s width is less than the width of gear rim Rotate freely within gear rim when not loaded by spring. When spring loaded it rotate with gear rim

39 Shoe expansion (locking plate right & left) and helical spring Two rectangular steel strips hold by a clamp at one end. Other end butted against slip rim ends. Shoe expansion extends rotary movement of gear rim to lift out & drive disc. Helical spring placed between shoe expansion in compressed condition. Compressed spring compel gear rim and slip rim to act as one piece

40 Sequence of rotation of gear &disc How different gear and disc rotate in side friction clutch Pinion of motor rotates Gear rim, then Gear rim rotates slip rim then slip rim rotates shoe expansion, then shoe rotates lift out disc and drive disc, then d.disc rotate drive disc, then d.disc rotate control disc and shaft with pinion & lock pawl

41 How friction clutch performs?  During normal course of operation  During obstruction  At end of operation

42 Friction clutch during normal course of operation During normal course of operation Pinion operates gear rim slip rim & shoe expansion rotates along with gear rim as these are spring loaded in side gear rim the edge of one shoe expansion engages in the notch on inner periphery of lift out disc & lift out disc rotates the same edge of one shoe expansion engages with projection on drive disc also & drive disc rotates shaft rotates along with drive disc & stroke of 143mm generated

43 Friction clutch during normal course of operation Gear Rim Slip Rim Projection on Inner periphery Of drive disk Shoe expansion s s

44 During obstruction The drive disc cannot rotate, as throw bar/gear rack is stationary Hence shoe expansion engages with projection on drive disc also cannot rotate. But pinion of motor forced to rotate gear rim Hence rotary force will appear on other shoe expansion The helical spring get compressed & slip rim collapse to reduce circumference of slip rim The gear rim alone rotates with slight friction between gear rim& slip rim.

45 During obstruction Gear Rim Slip Rim Projection on Inner periphery Of drive disk Shoe expansion s

46 Friction clutch at end of operation At end of operation projection on outer periphery buts with bottom rod Obstruction is generated inside the machine Friction clutch slips & snubbing is achieved.

47 Friction clutch at end of operation Bottom bar Drive disc

48 CONTACT ASSEMBLY WITH SPRING LOADED ROLLERS Contact assembly comprises of two spring loaded contact groups which are fixed inside the casting. Function of the contact assembly: - make and break the sets of contact. One group Contains two sets of contact fixed side by side Contact controls feed (Power) to motor and point indication relay

49 CONTACT ASSEMBLY WITH SPRING LOADED ROLLERS Each Contact group comprises of  Eight terminals in two sets for wires termination  terminals sets fixed opposite to each other on the casting  Eight high tensile contact (metal strips) in two sets. Two sets of contact are fixed back to back on spring loaded bracket / crank. Two sets of roller are fixed on same spring loaded bracket / crank. Bottom roller and top roller A transparent cover protects all sets of contact and terminals The transparent cover has sealing arrangement also. Bottom roller Top Roller Control contacts Control contacts

50 CONTACT ASSEMBLY WITH SPRING LOADED ROLLERS Terminal and finger contacts are insulated from metal part of point machine. Two Finger contacts are shorted at one end Carbon tip is fixed on other end of Finger. Outer side two sets of contact are known as Control contact and inner side two sets of contact are known as Detection contact. These contacts are self wiping, they clean themselves during the process of making and opening.

51 PARTS OF CONTACT ASSEMBLY

52 Making of contacts Making of contact depend upon position of top and bottom roller on the periphery of control disc and detection slid respectively. Detection contact in one group & control contact in other group makes when  top roller fall in nominated notch on friction clutch  bottom roller fall in nominated notch on periphery detection slid Falling of top roller in notch proves correct locking of point Falling of bottom roller in notch on proves correct setting of switches / points. Bottom Roller Inside notch top Roller Inside notch top Roller outside notch

53 Detection contacts Making of Detection contacts proves correct setting and locking of switches. Detection contacts are classified as Normal detection contact (ND) and reverse detection (RD) contact. ND contact make when point correctly set and lock in Normal. RD contact make when point correctly set and lock in Reverse. if point is not set correctly and/ or not correctly locked then both ND contact and RD contact are remain in open condition. ND contact and RD contact are used circuit of point indication relay NWKR and RWKR respectively.

54 Check for Correct setting and locking of point The notches on detection slides and friction clutch can be make available for bottom and top roller by moving lock slides and detection slides. Dose it Mean that ND & RD contacts can make even though point is not lock and set? proving of correct setting and locking of point by ND & RD contact is subject to condition that length of ground connections between point slides are accurately adjusted. proving of correct setting and locking of point by ND & RD contact is subject to condition that length of ground connections between point slides are accurately adjusted. This is prime check to be done at site during installation & Maintenance

55 Control contact Feed to motor is control through these contacts Control contact controls feed to motor in normal course of working Types of Control contacts  Normal Control contact (NC)  Reverse Control contact (RC). When points set and lock in Normal then RC contact makes. When points set and lock in Reverse then NC contact makes. When point is not correctly set and/ or not correctly locked position than both NC contact &RC contact are remain in make condition. NC contact controls feed for reveres to normal operation of point RC contact controls feed for normal to reveres operation of point. NC and RC opens as soon as point correctly set and lock in required position.

56 Detection slides D Type detection slid C Type Detection slid Wide notchSmall notch Threaded Stud Brass stripe

57 Detection slides These are two rectangular strong metal strips and two threaded rods are welded at one end. Each slid have a small and a wide notch on its one of surface. These slides are connected to switches of point and used to prove correct setting of switches. Bottom Rollers of switching unit are mounted on surface of these slides. Threaded studs welded sideways to avoid interchanging position of slides Rectangular Brass strips are riveted on inner surface Brass strips avoids transfer of movement to other slid which is supposed to be stationary in case of rod breakage

58 Lock slides

59 These are two rectangular strong metal strips and two threaded rods are welded at on end. Each slid have a small and a wide semicircular notch, These slides are connected to switches of point and used to lock the switches. These slides are connected to switches of point and used to lock the switches. Lock segment on drive disc engages in these notches Threaded studs welded sideways to avoid interchanging position of slides Rectangular Brass strips are riveted on inner surface Brass strips avoids transfer of movement to other slid supposed to be stationary in case of rod breakage

60 Position of point/ Switches Position of Notches on Lock slid Position of top Roller ND For RHS mounting RD RHS mounting NC RHS mounting RC RHS mounting Control/lift out disc Bottom rollerLHS mounting When switching unit is not fixed on machine Make Openopen Make Open Set in normal but not locked AvailableOn periphery of control disc & lift disc Open Make 1,1a 5,5a Make 2,2a 6,6a Not AvailableHanging on notch of detection slides Open Make 2,2a 6,6a Make 1,1a 5,5a Set and locked in normalAvailableIn the notch of control disc & lift disc Make 3,3a 7,7a Open Make 2,2a 6,6a AvailableIn the notch of detection slides Make 4,4a 8,8a Open Make 1,1a 5,5a Set in reverse but not locked AvailableOn periphery of control disc & lift disc Open Make 1,1a 5,5a Make 2,2a 6,6a Not AvailableHanging on notch of detection slides Open Make 2,2a 6,6a Make 1,1a 5,5a Set and locked in reverseAvailableIn the notch of control disc & lift disc OpenMake 4,4a 8,8a Make 1,1a 5,5a Open AvailableIn the notch of detection slides OpenMake 3,3a 7,7a Make 2,2a 6,6a Open


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