Main Structure on MUZL 610TW Type Pellet Mill

MUZL 610TW Type Pellet Mill mainly consists of a feeder, a conditioner and a principal machine of pellet mill (mainly including two main motors, an assembly of rotor, a ring die, press rollers, two assembly of cutting knives, a lifting device for the ring die and a lubrication system) (Fig 2.1).

1. Feeder
2. Conditioner
3. Lifting beam
4. Magnet
5. Assembly of cutting knife
6. Main motor
7. Shear pin
8. Lubricating system
9. Ring die
10. Roller
11. Scraper

The working procedure is shown as follows:

The mixed mash 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 conditioned compound mash is normally controlled within 65~95℃ and the humidity 14~18% 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.

Feeder

The feeder on the pelleting machine is composed of a frequency control motor, a speed reducer, a sprocket driving device, an auger shaft and auger housing.

The frequency variable speed control motor is composed of a frequency conversion motor and a speed reducer. Working with the frequency converter, output rotating speed of the motor can be changed. (See Operation Manual of Speed Control Motor and Operation Manual of Frequency Converter for details).

A cycloid pin gear speed reducer with a speed reducing ratio of 1:17 allows the feeding auger to regulate speed in a range of 0~100 r/min.

Conditioner

A common conditioner is composed of a motor, a main shaft, paddles, a case, a steam inlet and the molasses inlet.

The conditioner case is made of stainless steel and the paddles are made of high alloy wear resistant material or stainless steel.

The conditioner serves the function of introducing steam with a certain pressure, and at the same time adding a proper amount of oil and molasses through the feeding inlet for molasses as required for conditioning compound feed to a certain temperature and humidity, so as to improve the feed value and pelletizing performance of the feedstuffs themselves. Refer to the next section for the steam system of the conditioner.

Steam system

Fig 2.2 shows the schematic diagram of pipeline for conditioner. Steam is generated by the boiler. The pressure of steam provided by the boiler shall be not less than 0.7 MPa, and the steam supply amount is calculated on the basis of 50 kg per ton pellet plus loss. Generally, the steam pressure in the main pipe shall be not less than 0.7 MPa, and the pressure of steam entering the conditioner after being depressurized by relief valve is within 0.1~0.4 MPa.