User talk:Amitava banerjee

Welcome!
Welcome to Wikipedia, Amitava banerjee! Thank you for your contributions. I am MJ94 and I have been editing Wikipedia for some time, so if you have any questions feel free to leave me a message on my talk page. You can also check out Questions or type at the bottom of this page. Here are some pages that you might find helpful: Also, when you post on talk pages you should sign your name using four tildes ( ~ ); that will automatically produce your username and the date. I hope you enjoy editing here and being a Wikipedian! MJ94 (talk) 19:58, 12 June 2012 (UTC)
 * Introduction
 * The five pillars of Wikipedia
 * How to edit a page
 * Help pages
 * How to write a great article

UNIT TRAINING MANUAL ON CONVEYOR BELT JOINING & REPAIR BY COLD & HOT VULCANIZING (IN SITU)
(In addition to the skills and knowledge content of this particular job the trainee must be alerted to and fully understand those “Safety Aspects” which must be strictly adhered to.

Due to continuous improvement in quality, technology and customer demands, amendments will be made in the manual from time to time.)

INTRODUCTION

Conveyor belts are one of the main modes of material handling and transport for an integrated steel plant. Conveyor belts can be of various types and different widths of conveyor belts are in use, commonly 600mm, 800mm, 1000mm, 1200mm, 1400mm,1600mm, etc.

During changing these conveyor belts or when eliminating any part or lengthening the conveyor belts we have to join the ends of belt pieces to make the belt endless. These joining of belts are done in two processes.

They are, (1) Cold vulcanizing and (2) Hot vulcanizing.

The conveyor belt ends have to be prepared in almost the same way in both the cases, but after that whereas cold vulcanizing is a simple process, hot vulcanizing on the other hand needs the help of machine and is a more complex process requiring proper adjustment of heat, pressure and time.

Generally cold vulcanizing is done in most cases but hot vulcanizing is done in a very few critical cases where the joint may have to withstand heat or water or both, as hot vulcanizing is much more reliable because it gives a 100% perfect strength to the joint, even in high temperature and water logged places, making the joint area similar to the original belt in its properties.

This manual will try to deal with both the processes in a simple but detailed way as much as possible.

Product:-

Permanent joint of conveyor belt ends which overlap perfectly with each other by keeping the thickness and width of the joint area same as the belt itself.

Process:-

Plies from both the belt ends are stripped in such a way so that they seem like steps and when overlapped, can match perfectly against each other and help to keep the thickness and width of the belt to remain the same as the original belt throughout the joint area. This type of belt end preparation is also called diagonal splicing.

The joining is done in two different ways.

Cold Vulcanizing - Here liquid adhesive solution mixed with hardener is applied on the prepared (stripped) end surfaces and after proper drying the surfaces are pasted by overlapping against each other and hammering them.

Hot Vulcanizing - Here at first solid rubber adhesive strips are pasted between the prepared belt surfaces with the help of a highly viscous liquid. Then the joining is done inside the hot vulcanizing machine which is operated with electricity and hydraulic pump as proper adjustment of heat, pressure and time are needed in this case.

Equipments:-

1) Belt-cutters and Max-pullers for belt preparation.

2) Cold Vulcanizing Adhesive and Hardener for cold vulcanizing.

3) Hot Vulcanizing solution, solid rubber-adhesive strips, and hot vulcanizing machine with electrically operated hydraulic pump, and electrically operated temperature control for hot vulcanizing.

Interface:-

1) Dust and moisture free environment.

2) The number of steps in both ends should always be one less than the number of plies in the belt. (e.g. 3 steps for 4 ply belt.)

3) Proper buffing of stripped surface to be done.

4) Belt-cutters to be sharpened properly.

5) Alignment during overlapping should be correct.

6) Homogenous mixture of adhesive and hardener for cold vulcanizing.

7) Perfect drying after applying the mixture before overlapping for cold vulcanizing.

8) Proper hammering all around the joint area after overlapping.

9) After joining, belt to be left to dry for at least 3 hours for cold vulcanizing.

10) Maximum pressure – 300 bars for hot vulcanizing.

11) Maximum temperature - 150 degree centigrade for hot vulcanizing.

12) Holding time – 45 minutes at maximum temperature and pressure for hot vulcanizing.

KEY PERFORMANCE FACTORS

(For Preparation of the Joint Area of Conveyor Belts)

L = Total stripping length,

W = Width of the belt,

S = Width of each step,

N = No. of plies in the belt,

No. of Steps = No. of plies – 1 = N – 1,

Bias = Half of the width of belt = W/2,

L = [W/2 + S (N - 1)] + 1inch.

(All measurements are in are in inches)

e.g.:-

for 1200mm belt, W is approximately 48 inches,and S is normally taken as 16 inches.

for 1000mm belt, W is approximately 40 inches,and S is normally taken as 14 inches.

for 800 mm belt, W is approximately 32 inches,and S is normally taken as 10 inches.

According to the above formula the length of joint for various widths of conveyor belts are as follows:-

In 1200mm (48”) belt of 4 ply, L = 48/2 + 16(4-1) + 1” = 73” or 6’ 1”.

In 1000mm (40”) belt of 4 ply, L = 40/2 + 14(4-1) + 1” = 63” or 5’ 3”.

In 800 mm (32”) belt of 4 ply, L = 32/2 + 10(4-1) + 1” = 47” or 3’ 11”.

And so on ……….

N.B.:- In case of hot vulcanizing the total length of the joint must be kept within the width of the hot plates (i.e. not more than 49 inches.) Hence the maximum widths of the strips (S) are kept not more than 10 inches and the bias is adjusted accordingly but not more than 21 inches. (This does not affect the strength of the joint as hot vulcanizing itself gives a much stronger joint than cold vulcanizing.

KEY PERFORMANCE FACTORS

(For Cold Vulcanizing)

1) Ratio of mixture of Cold Vulcanizing Adhesive to Hardener is as follows:-

1 liter of Adhesive: 1vial or 45ml. of Hardener.

2) Least no. of coats to be applied: - 2 coats.

3) Curing time taken after completion of the joint: - 3Hrs.

KEY PERFORMANCE FACTORS

(For Hot Vulcanizing)

Pressure and Temperature sequence against Time during Hot Vulcanizing:-

Power ON → Control Panel ON → Hydraulic Pump Motor ON → 50bars → 50°C →100bars → 100°C →200bars → 130°C → 300bars → 150°C →(hold for 45 minutes)→ Control Panel OFF → 70°C →(slow release of pressure)→ 0 bar → Hydraulic Pump Motor OFF → Power OFF

TOOLS AND TACKLES REQUIRED

(For Preparation of Joint Area of Conveyor Belts)

1) Max-puller with frog clamp -1no.

2) Belt-cutters of two types:-

a) Drag Belt-cutters -2nos.

b) Straighter Belt-cutters 1no.

3) Chalk and marking thread--1each.

4) Steel tape--1no.

5) Try square--1no.

6) Wooden boards made of planks---2nos.

(These boards differ according to the width of the belts.)

7) Pincers or pliers--2nos.

8) Buffing machine-1no.

9) Wire rope slings of 10mm dia. -3nos.

10) Long electric cable with socket at one end1set.

11) Coir brush-1no.

12) 50mm MS angles with slotted holes at both ends with 2nos. M16 bolts—---2 pairs.

(These are generally called Stretures).

13) Spanners (24/27)

a) Double end ring-1no.

b) Double end open jaw-1no.

14) Sharpening stone for knives1no.

15) Nails (3 inches) ---1dozen.

INSTRUCTION

(For use of Cold Vulcanizing Adhesive and Hardener)

1) For application in bonding rubber to metal, rubber to rubber, rubber to fabric and fabric to fabric.

2) Shake well before use (for both Adhesive and Hardener).

3) Add recommended quantity of Hardener to the Adhesive as specified (in ratio:-1bottle:1ltr.).

4) Content of Adhesive in the container: - 5 liters or 4.5 kg.

Content of Hardener in the bottle:- 45ml. or 56 gms.

5) Stir the adhesive gently but thoroughly while adding the hardener to it, avoid aggressive stirring and frothing.

6) Once the original packing is opened, it is advisable to use the entire quantity. Incase only partial quantity is required, it is recommended to seal the container / bottle air tight with the original cap / insert-plug tightly closed when not in use.

7) It is normal for the contents of bottle to vary within a range of ± 5% by volume. If such variations are noticed with the original sealing of the bottle intact and without leakage, then the complete contents maybe used without compensating for the same.

8) In case of the contents of the container variations within ± 2.5% is normal.

9) Keep the container / bottle in a cool dry place, at temperature of 20°C and away from direct sunlight.

10) Use before expiry date (for both Adhesive and Hardener).

TOOLS AND TACKLES REQUIRED

(For Cold Vulcanizing)

1) Brush (75 mm.) 2nos.

2) Plastic Mug (2Ltr.) ---2nos.

3) Cold Vulcanizing Adhesive 3Ltrs.

4) Liquid Hardener for Adhesive -2vials(45ml.each).

5) Hot Air Blower -1no.

6) Hammers

a) Ball Peen --1no.

b) Flat & Round ---1no.

7) Stick to stir the mixture --1no.

TOOLS AND TACKLES REQUIRED

(For Hot Vulcanizing)

1) Hot Vulcanizing machine, consists of:- a) Heating platens with heating coils 2nos. b) Electrically operated hydraulic pump (Filled with oil) or hydraulic power-pack--1no. c) Electrical panel box for temperature control with sockets --1no.

d) Cross beams with hydraulic jacks (5 nos. in each) -5nos. e) Cross beams without hydraulic jacks ---5nos. f) Jack studs (end bolts) ---10nos. g) Electric cables for heating platens with sockets---2nos. h) Electric cable for earthing 1no. i) Hydraulic hose (main) --1no. j) Hydraulic hose (branches) -5nos. k) Hydraulic distributor --1no. l) Electric cable for hydraulic pump --1no. m) Electric cable for power supply 1no. n) Handles for lifting the heating platens ---4nos. o) Special screw driver to adjust trim pots ---1no.

2) Single end and open jaw spanners (41) for jack studs (end bolts) -2nos.

3) Cylindrical roller 1no.

4) Saw-toothed flat roller ---1no.

5) Ball peen hammer --1no.

6) Flat Round hammer -1no.

7) Insulation compound (thin tape) ---As required.

8) Cover compound (thick tape) ---As required.

9) Hot vulcanizing solution (black & sticky highly viscous liquid) ---As required.

10) Paint brush --2nos.

11) Plastic mug --2nos.

12) Old newspaper As required.

PERSONAL SAFETY

1) Always use safety boots and safety helmets.

2) Use hand gloves during rigging jobs.

3) Use gum boots in muddy and water logged areas.

4) Use dust musk in dusty areas.

5) Always be careful when using sharp belt-cutters.

6) Wear safety goggles while buffing.

7) Be careful when working at height.

8) Do not wear loose garments.

9) Never stand on the belt while stripping.

10) Be careful of hot blower.

11) Do not let vulcanizing chemicals get into your eyes or mouth.

12) Be very careful when moving or lifting the heavy hot vulcanizing machine.

13) Wear rubber soled boots while working with electricity.

14) Never touch the heating plates when they are hot.

15) Take care of oil spillage from hydraulic pump.

EQUIPMENT SAFETY

1) Ensure that the job area is free from dust and moisture.

2) Ensure that cutting edges of belt-cutters do not get blunt.

3) Ensure that max-pullers, frog-clamps and slings are in proper shape.

4) Ensure that vulcanizing chemicals are free from dust and water.

5) Ensure that hydraulic pump does not leak.

6) Ensure electrical safety when working with vulcanizing machine

PROCEDURE

Getting ready for belt end preparation:-

1) Bring the two ends of the conveyor belt to be joined near each other so that when overlapped (after diagonal splicing) they can match perfectly.

2) Clamp the conveyor belt ends with a pair of angles to arrest the belt ends.

3) Fasten the angles to the roller table with slings to make them remain fixed in place.

4) Boards made of wooden planks to be placed under the belt ends, which become the work area for vulcanizing.

5) Fix the max-pullers in a safe and convenient position so that the strips of plies can be pulled out from a safe distance.

Laying of belt ends:-

1) Keep the belt end (whose top surface is to be stripped) towards the tail end drum side.

2) Keep the other end (whose bottom surface is to be stripped), towards the driving drum or head end drum (this belt end may be turned upside down for convenience).

Shaping the ends:-

1) Cut both the belt ends one by one in such an angle that opposite sides of each end of the belt is longer by half the width of the belt than the other side.(i.e. when facing towards the driving end, the right side of the first end of the belt is longer by half of belt-width than the right side of the second or opposite end of the belt, similarly the left side of the first end is shorter by half of belt-width than the left side of the second end of the belt. This is called the BIAS.)

BIAS = Half of the width of the belt.

(But for practical purposes it has been standardized that BIAS = 21 inches max. and Width of steps = 16 inches max. as this is enough to give 100% strength to the joint.)

Stripping of plies:-

(Head end drum side)

1) Start with the driving end side or the head end side belt end which is turned upside-down (bottom surface facing upwards).

2) Draw marking lines parallel to the Bias on the belt end surface which is faced upwards (bottom surface) with tape and chalk, for cutting steps.

3) Cut plies with drag belt-cutters along the marked lines in steps (i.e. single ply cut along the innermost line, double ply cut along the last-but-one innermost line, triple ply cut along the third line from the innermost and so on till the outermost end of the belt, parallel to the Bias is reached).

4) Peel off the step cut plies with pincers and frog clamp of max-puller along the cutting lines.

5) Strip the plies one by one in such a way so that they seem like steps.

6) Make the outermost step towards belt end the thinnest (i.e. one ply and rubber top or one ply and rubber bottom).

7) Keep two plies in the last but one step, behind the outermost.

8) Keep three plies in the next and so on, according to the number of plies in the belt.

9) Use straighter belt-cutter to keep the peeling straight with the marking line.

10) Rub chalk on the edge of the stripped steps parallel to the bias of the driving side end (i.e. the end turned backwards).

Stripping of plies:-

(Tail end drum side)

1) Use the steps of head end drum side belt end to mark the tail end drum side belt end (i.e. the end which is placed flat on the working area), by overlapping and pressing the stripped bottom end of head end side belt end on the top surface of tail end side belt end.

2) Draw marking lines along the chalk marks of steps created due to the overlapping and pressing on the top surface of the tail end side belt end.

3) Cut and strip the tail end side belt end in the same way as the head end side belt end.

(This system makes identical but opposite steps like mirror image which helps in perfect matching of the top and bottom steps of the two ends during overlapping, and keeps the thickness and width of the belt to remain the same as the original belt throughout the joint area.This is called Diagonal Splicing.)

NB: - The number of steps in both the ends should always be one less than the number of plies in the belt. For example, there should be 3 steps for a 4 ply belt.

No. of steps = No. of plies – 1

CAUTION: - While cutting the plies, deep cut should not be done, as it will damage the next ply and weaken the joint.

Finishing the belt end preparation:-

1) Check the final alignment by overlapping both ends and take care that there are slight gaps in-between the top and bottom steps while matching with each other.

2) Fasten the head end side belt end which is turned backwards (i.e. upside down) by nailing it with the board so that its bottom surface (which is stripped) remain fixed, facing upwards.

3) Nail the tail end side belt end also to the board, but in flat position with its stripped top surface facing upwards.

4) Do buffing on the stripped surfaces to get a rough but even texture.

5) Clean away buffing dust from the stripped surfaces with coir brush.

6) Use: - Adhesive for cold vulcanizing and Hardener.

Now the preparation of belt ends for joining is complete.

Cold vulcanizing:-

(Process)

1) Pour the cold vulcanizing adhesive in two mugs in equal volumes (one liter each).

2) Pour the hardener into the adhesive, one vial in each mug.

3) Stir the mixtures in the two mugs with a stick to make a homogenous  solution in each mug.

4) Apply the solution on the previously prepared (stripped) belt surfaces with the help of paint brushes, just like painting and see that it is spread uniformly.

5) Give each surface at least two coats of solution.

6) Always apply the second coating only after the first coating has almost dried.

7) Use hot air blower to dry when there is high moisture in the atmosphere, or when the belt is wet.

8) Wait till the second coating of solution is almost dry but is still sticky.

9) Pull out the nails and overlap the stripped surfaces of belt ends (top & bottom) with great care so that they match evenly and accurately along the previously marked lines.

10) Hammer the whole joint area evenly with ball peen and flat hammer so that no air bubbles are trapped in between the overlapped surfaces.

11) After this leave the belt joint area to dry for about 3 hours. This is called the Curing time.

During this period no movement of the belt should be allowed in any circumstances, because even a slight movement of the belt will affect the quality of the joint and decrease its strength.

NO NEGLIGENCY SHOULD BE ALLOWED IN ANY WAY IN THIS CASE.

12) After 3hours take out the boards, unfasten the angles and release the conveyor belt.

Now the joining of conveyor belt by Cold Vulcanizing process is complete.

Preparation of belt for Hot Vulcanizing:-

1) Place the belt ends on the working area.

2) Prepare both ends with diagonal splicing (i.e. strip the plies as in cold vulcanizing).

3) Fix both the belt ends with nails after proper alignment just as in cold vulcanizing.

4) Pour the Hot Vulcanizing Solution in the two mugs in equal volumes.

5) Apply the solution on both the previously prepared (stripped) belt surfaces with the help of paint brushes, just like painting and see that it is spread uniformly.

6) Paste the tapes of insulation compounds on the prepared belt surface which is laid flat on the working area (i.e. the belt end whose top surface is stripped).

7) Place the adhesive sides of the insulation compound on the stripped top surface of the belt, over the already applied hot vulcanizing solution.

8) Lay the tapes of insulation compound parallel to the Bias, and parallel to each other.

9) Use two layers of insulation compound to cover the total stripped area.

Do not leave any portion blank, if needed paste more layer of tapes to cover the gaps.

10) Cover both edges of the joint with insulation compound for sealing.

11) Use cylindrical roller and saw toothed flat roller to get rid of the air bubbles trapped under the insulation compounds.

12) Pull out the nails used to fix the belt end and overlap the stripped surfaces of belt ends (top & bottom) with great care so that they match evenly and accurately along the previously marked lines.

13) After overlapping, prepare 5mm deep channels at the beginning of the joint, parallel to the Bias.

15) Fill this channel by pasting tapes of cover compounds, so that it is slightly more than 5mm. This on heating seals the joint.

16) Place two belt pieces slightly less than the thickness of the original belt touching the edges of the joint. This helps in sealing the edges of the joint area.

17) Place old newspapers over the joint area, so that the liquefied compounds, due to heat and pressure, do not stick to heating platens.

18)Use:-

Hydraulic Pressure Vulcanizer(i.e. belt vulcanizing machine for upto 1400mm belt width.)

Now the conveyor belt ends are ready for hot vulcanizing.

Setting up of Hot Vulcanizing machine:-

1) Align the lower crossbeams on a level base.

2) Place the lower heating plates on the lower crossbeams (always use the four handles provided).

3) Make the lower heating plate top surface the working area.

4) Place the belt ends on the lower heating plate.

5) Prepare the belt ends for hot vulcanizing.

6) Position the top heating plates exactly in line with the lower heating plates (by using the four handles).

7) Place the top hydraulic crossbeams exactly in line with the lower crossbeams.

8) Insert the jack studs (or end bolts) between the top and bottom crossbeam ends that are projected outside the heating plates through the holes provided at the crossbeam ends.

9) Tighten the studs simultaneously at both ends of the crossbeams with the two single ended spanners provided.

10) Set up the electrically operated hydraulic pump and electrical panel box for temperature control.

Setting up of electrically operated hydraulic pump (power pack):-

1) Connect one quick release coupling end of the main outlet hose with the hydraulic pump by pulling back the knurled nut and pushing the quick release coupling fully and then releasing the knurled nut.

2) Connect the other coupling end of the outlet hose to the distributor block,

3) Connect one each of the two coupling ends of every branch hose with the distributor block.

4) Connect the other quick release coupling ends of the branch hoses to the inlets of the top crossbeams.

5) Fill up the previously cleaned tank of the hydraulic pump with clean hydraulic oil (hydraulic fluids ranging between 160 and 270 SSU at 38°C).

6) Connect the electric cable of hydraulic pump motor (power pack) to the electric power supply.

7) Check for any misalignment of electric motor and pump shaft. In case of misalignment first tighten all the tank top plate bolts equally to avoid bending of the plate. Then align the shaft within 0.05mm.

8) Start the motor and confirm that the rotation is as indicated on the pump. Repeat the operation 3 or 4 times before running the motor continuously.

9) Check pipe-work, fittings and every point in the system for leakage of oil and correct immediately.

10) Adjust the pressure adjustment knob of the relief valve clockwise for increasing the system pressure by bringing on the actuator to dead end position by actuating the solenoid valve provided.

11) Bleed the actuator by moving the piston to and fro until all the air is removed from the system. If bleeding point is not available, loosen both inlet and outlet line fittings and then move the actuator to and fro.

12) Check oil level. In case oil level comes down while filling the actuator and oil line, top up the oil level by adding clean oil.

13) Avoid unnecessary use of fittings and sudden change in direction of pipe work.

14) Check for wear, misalignment, slippage, cavitations, aeration and internal leakage in the hydraulic pump, which may cause excessive noise and heat generation during operation of the pump.

Now the power pack is ready for operation.

Setting up of the temperature control panel box:-

1) Connect each of the round socket ends of both the 2 nos. power cables to the 2nos. 440 volt outlet of the control panels.

2) Connect each of the flat socket ends (other end) of both the power cables to the flat inlets of the top and bottom heating plates.

3) Connect each of the earthing cables from the earth connections provided on both the heating plates to the two earthing connection provided on the control panel.

4) Connect the round socket of the power inlet cable to the 440 volt inlet of the control box.

5) Connect the power cable to the 440 volt, 3 phase electric power supply.

6) Rotary Switch – The temperature control panel box is provided with a rotary switch. The supply to the heating plate is provided through this rotary switch which has 4 positions.

In position number 1, temperature control of both heating plates 1 and 2 will be on automatic mode.

To control the temperature manually position 2, 3 & 4 are to be used.

7) Temperature Controllers – There are 2 temperature controllers fixed on top of the control panel. The two 3 1/2 digit displays indicate either process or set temperature. Small window at bottom of front panel indicates input type.

8) Set Point Key & LED – When this key is pressed, the 3 1/2 digit display reads set temperature and the Set LED glows. It indicates the temperature being displayed is Set Temperature.

9) Relay LED – This LED turns ON when the Relay is in energized condition.

10) Set – This trim pot is used to adjust set temperature. It has 10 turns, enabling fine adjustment. Turn clockwise to increase Set temperature.

11) RST or Reset – This trim pot is used to reset the difference between actual process temperature and set temperature.

12) HYST – This is the same trim pot used for Reset. In case of ON/OFF control action, it is used for ON/OFF differential.

Hot Vulcanizing:-

(Process)

1) Switch on the main electric power supplies.

CAUTION: - Please do not switch on supply unless the earth connection is made. Verify the availability of power at the outlet sockets. If the power is not available in all 3 phases of both the outlet sockets, then check the MCBs, the contacts and the wiring. Check whether the terminal ends of the heating elements are properly insulated against electrical short circuit using heat resistant insulation material.

2) Switch on the hot vulcanizing machine control panel.

3) Switch on the hydraulic pump motor.

CAUTION: - Check leakage in the quick release couplings of the hoses due to ingress of dust and dirt. If this happens, slightly built up the pressure in the hose, and then press the pin at the centre of the quick release coupling inwards to release oil. This may be done a few times to remove the dirt along with the oil.

When building up pressure with the electrically operated hydraulic pump, please ensure that the release valve is closed.

Always increase the pressure in stages, with increasing temperature.

Check pressure continually during the vulcanizing cycle, any pressure exceeding operating pressure is required to be corrected by using the valve lever on the pump.

4) Set the hydraulic pressure to 50 bars.

5) Wait till the temperature of both heating plates increases to 50°C.

6) Increase the pressure to 100 bars.

7) Wait till the temperature of both plates increases to 100°C.

8) Increase the pressure to 200 bars.

9) Wait till the temperature of both plates increases to 130°C.

10) Set the pressure to 300 bars (maximum pressure).

11) Wait till temperature of both the plates increases to 150°C (maximum temperature).

CAUTION: - Set Point Key to be pressed gently, as excessive pressure may damage membrane key pad.

Use special screw driver supplied with the instrument to adjust Set/Reset trim pots to avoid damage.

12) Hold the maximum temperature and maximum pressure for 45 minutes.

13) Switch off the control panel of the Hot Vulcanizing machine.

14) Wait till the temperature of both plates slowly decreases to 70°C.

15) Very slowly release the hydraulic pressure till it decreases to 0 bar.

CAUTION: - Release the pressure very slowly as otherwise the quick release couplings provided on the crossbeams will act and lock the pressure. If this happens, please build up pressure once again and gradually release pressure.

16) Switch off the hydraulic pump motor.

17) Switch off the main electric power supply.

18) Wait for the temperature to come down to normal room temperature.

Dismantling:-

1) Disconnect the quick release couplings of the hydraulic pump from the top crossbeams of the hydraulic machine by pulling back the knurled nut and pulling out the quick release couplings.

CAUTION: - When the machine is not in use, always ensure that the quick release coupling ends, the locking nipple ends and the closure nipple ends are sealed by using plugs provided for this purpose to avoid ingress of dust and dirt.

When not in use always keep the reservoir, tubes, pipes, actuators, filters, strainers, seals, bearings, couplings, fittings etc. thoroughly clean and in good condition

2) Disconnect all the sockets of electric cables and earthing cables from the hot vulcanizing machine, control panel box and main power supply.

3) Cautiously dismantle the hot vulcanizing machine, by reversing the procedure indicated for assembly.

4) Release the conveyor belt.

Now the joining of conveyor belt by hot vulcanizing process is complete.

--223.223.153.169 (talk) 16:51, 19 June 2012 (UTC)