Startup a new pellet mill or a pellet mill with a new ring die according to following steps:
1) Open the bypass gate;
2) Startup the main motors of the pellet mill. The motor shall be started up in Y firstly, and runs in delta connection while under normal operation speed;
3) Feed a certain amount of oily coarse mash to the inlet of the feed machine manually, and continue feeding until pellet is formed. This is the primary lubrication for the ring die before normal production;
Oil bearing material: generally, feed mash with ≥10% oil content. The raw materials of rice bran, expanding soybean and others can also used as oil bearing material. As for bad quality ring die with rough hole wall, about 15% spun yarn passing through 40 mesh screen can be added in oil bearing material for rinsing and grinding the die (generally persist for more than 30 minutes), otherwise, the materials cannot be discharged.
4) Startup the conditioner motor;
5) Startup the feeder motor, adjust the frequency converter to a low frequency (generally about 5Hz) and allow the feed to enter the conditioner slowly, Do not add any steam at the beginning of pelletizing, close the bypass gate and slowly quicken the feeding speed based on the current of the main motor;
6) Open the steam valve a bit, then increase the feeding amount when the ammeter’s pointer is falling; when the ammeter’s pointer of the main motor reaches the normal load, add steam amount to allow the ammeter’s pointer to fall back. Repeat again and again until the maximum output and the best quality of pellet are obtained under the rated load;
7) A schematic diagram of pellet extrusion is shown in Fig 4.1. The feeding amount and steam supply are different upon the types of ring die and formulas, and the pellet quality varies as well. So the operator shall be rich in operating experience.
Showing posts with label Pellet Mill. Show all posts
Showing posts with label Pellet Mill. Show all posts
Friday, July 25, 2014
Wednesday, September 18, 2013
Electric Connection While Operating the Pellet Mill
Connect the principal machine, control system and control cabinet with power supply according to local rules and regulations for electric connection.
Lay the power cables and install the circuit protection breakers according to power voltage and motor power as well as the stipulations of the supplier. Correctly connect and check all grounding wires.
Lay the power cables for the control and high voltage cabinets on the installation site. Touch screen or The local control box shall be installed at a distance of 0.5m ~ 3m on the right side (preferred) of the pellet mill or installed at a distance of 1.0m ~ 3m on the left side of the machine.
The motors shall be interlocked with each other when laying power cables, and switched on according to following sequence:
①Motor for Hydraulic system ( if required)
②Main motor for the pellet mill
③Motor for the conditioner
④Motor for the feeder
There shall be an unlocking device between the main motor and conditioner, so it needs not startup the main motor when star ting the conditioner individually. Connect the motors correctly while adjusting its rotating direction.
The working principle and operation flow of the control box show as follows:
Commissioning process:
Make sure all the preparation works of pelleting machines are ready, the electric connection have been completed.
And then close each circuit breaker;
Release the lock emergency stop button E-STOP;
Switch the unlocking switch SA1 to the unlocking position, start up and shut down each electric motor to check whether it normal works.
Normal starting process:
Switch the unlocking switch SA1 to the interlock position, trigger starting button SB3+, start up the main motor of pellet mill and wait for one minute, trigger starting button SB2+ after its steady operation, start up the conditioner and wait for 30 seconds, trigger starting button SB+, start up the motor of feeder;
Explanation of working process:
The feeding frequency can be changed by adjusting the knob RP2 into a change of feeding amount, frequency meter PF21 can real-time display the operating frequency of feeding motor.
Temperature instrument U2 can real-time display the Material Temperature at the discharge hole of conditioner, the Material Temperature at the discharge hole can be adjusted by charging the steam additive amount in conditioner;
Shut down the feeding motor when the working current of main motor of the pelleting machine is more than rating or it increase rapid within the rated current interval, switch to the selecting switch SA2, electrified the by-pass solenoid valve, thereby opening the by-pass gate, the feeds will be discharged from by-pass gate and the motor load of pellet mill will be reduced. After the motor load returns to 50% of the rating, restart the feeder, gradually increase the feeding amount.
Stopping process:
Shut down the feeder first, wait for ca.10 minutes and then shut down the conditioner, shut down the main motor and cut off the general power after the working current of main motor reducing into the range of no load current. The handling of leak, electric shock, stoppage or severely overload: Press the emergency stop button immediately, to avoid the accident of casualties and motor damage.
Lay the power cables and install the circuit protection breakers according to power voltage and motor power as well as the stipulations of the supplier. Correctly connect and check all grounding wires.
Lay the power cables for the control and high voltage cabinets on the installation site. Touch screen or The local control box shall be installed at a distance of 0.5m ~ 3m on the right side (preferred) of the pellet mill or installed at a distance of 1.0m ~ 3m on the left side of the machine.
The motors shall be interlocked with each other when laying power cables, and switched on according to following sequence:
①Motor for Hydraulic system ( if required)
②Main motor for the pellet mill
③Motor for the conditioner
④Motor for the feeder
There shall be an unlocking device between the main motor and conditioner, so it needs not startup the main motor when star ting the conditioner individually. Connect the motors correctly while adjusting its rotating direction.
The working principle and operation flow of the control box show as follows:
Commissioning process:
Make sure all the preparation works of pelleting machines are ready, the electric connection have been completed.
And then close each circuit breaker;
Release the lock emergency stop button E-STOP;
Switch the unlocking switch SA1 to the unlocking position, start up and shut down each electric motor to check whether it normal works.
Normal starting process:
Switch the unlocking switch SA1 to the interlock position, trigger starting button SB3+, start up the main motor of pellet mill and wait for one minute, trigger starting button SB2+ after its steady operation, start up the conditioner and wait for 30 seconds, trigger starting button SB+, start up the motor of feeder;
Explanation of working process:
The feeding frequency can be changed by adjusting the knob RP2 into a change of feeding amount, frequency meter PF21 can real-time display the operating frequency of feeding motor.
Temperature instrument U2 can real-time display the Material Temperature at the discharge hole of conditioner, the Material Temperature at the discharge hole can be adjusted by charging the steam additive amount in conditioner;
Shut down the feeding motor when the working current of main motor of the pelleting machine is more than rating or it increase rapid within the rated current interval, switch to the selecting switch SA2, electrified the by-pass solenoid valve, thereby opening the by-pass gate, the feeds will be discharged from by-pass gate and the motor load of pellet mill will be reduced. After the motor load returns to 50% of the rating, restart the feeder, gradually increase the feeding amount.
Stopping process:
Shut down the feeder first, wait for ca.10 minutes and then shut down the conditioner, shut down the main motor and cut off the general power after the working current of main motor reducing into the range of no load current. The handling of leak, electric shock, stoppage or severely overload: Press the emergency stop button immediately, to avoid the accident of casualties and motor damage.
Wednesday, September 11, 2013
Working Principle on Pellet Mill
This machine mainly consists of a feeder, a conditioner and a principal machine of pelleting machine (mainly including a main motor, an Assembly of rotor, a ring die, press rollers, an assembly of cutting knives and a lubrication system).
Working procedure:
The mash with water content less than 18% as required enters the feeding auger from the pelletizing chamber in a proper feeding amount through adjusting the rotating speed of the frequency control motor, and then enters the conditioner. The material will be sufficiently mixed with steam in the conditioner by stirring paddles of the conditioner, and molasses or oil can be added through the feeding inlet for molasses if necessary. The temperature of compound mash is normally controlled within 65~95℃ and the humidity 14~17% based on different formulas, and finally the material enters the pelletizing chamber and is pelletized to pellets by the press rollers and the ring die.
The principal machine on the pellet mill is composed of main motor, magnetic plate, Assembly of rotor, pelletizing chamber (including assembly of press roller, assembly of front plat and ring die), machine body, door and so on, Fig 1.5 shows the section of MUZL350TA type pellet mill. To ensure safety, this machine shall be used in the areas with an altitude lower than 1000m, a temperature from -5℃ to 40 ℃ and an air relative humidity from 30% to 95%. If the area does not conform to above conditions, please indicate specially when ordering. This machine is specially used for feed processing, generally for processing powdery, foldable and easily pelleted materials. Do not use it for processing of food.
Working procedure:
The mash with water content less than 18% as required enters the feeding auger from the pelletizing chamber in a proper feeding amount through adjusting the rotating speed of the frequency control motor, and then enters the conditioner. The material will be sufficiently mixed with steam in the conditioner by stirring paddles of the conditioner, and molasses or oil can be added through the feeding inlet for molasses if necessary. The temperature of compound mash is normally controlled within 65~95℃ and the humidity 14~17% based on different formulas, and finally the material enters the pelletizing chamber and is pelletized to pellets by the press rollers and the ring die.
The principal machine on the pellet mill is composed of main motor, magnetic plate, Assembly of rotor, pelletizing chamber (including assembly of press roller, assembly of front plat and ring die), machine body, door and so on, Fig 1.5 shows the section of MUZL350TA type pellet mill. To ensure safety, this machine shall be used in the areas with an altitude lower than 1000m, a temperature from -5℃ to 40 ℃ and an air relative humidity from 30% to 95%. If the area does not conform to above conditions, please indicate specially when ordering. This machine is specially used for feed processing, generally for processing powdery, foldable and easily pelleted materials. Do not use it for processing of food.
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