Ring Die of MUZL 610TW Type Pellet Mill

It is essential to select ring die with correct material quality, structure, and dimension of die holes for improving the efficiency of the pellet mill. The ring die is usually made of forged material of high chrome alloy by vacuum heat treatment after being machined, and it is of good abrasion resistance and corrosion resistance.

Types of die hole structure of the ring die include:

Standard cylindrical holes
Holes with a conic inlet
Special die holes such as square holes, conic holes, and special number of holes

The ring die should be replaced as following procedures:
1. Ensure the power of the pelleting machine is cut off, the cutting knives are screwed off from ring die and the pelletizing chamber is opened before replacement.
2. Install the lifting device of the ring die to the lifting beam at the top of the machine body, ensure that the eye ring is fixed, and tighten the butterfly bolt to prevent the lifting beam from drawing out entirely.
3. Remove the rotary feeding cone and conic die flange.
4. Regulate the press roller to the place far away from the ring die.
5. Dismount the access door at both sides of the machine body so as to remove fastening bolts of the ring die.
6. Loosen the fastening bolts of the ring die
7. Screw in three top die bolts of ring die, and turn same number of turns by the wrench, thus the ring die can be ejected out of the driving flange.
8. Take out the whole ring die from the driving flange and place it on the press roller.
9. Lift the ring die by lifting device until pushing it wholly out of the pellet mill, scratching the surface of press roller should be avoided during this process.
10. Check whether the scraper on the front support is worn excessively or not after removing the ring die.
Installation of the ring die（see fig.2.4、2.5、2.6、2.7）：





The ring die should be installed as following procedures:
1. Turn off the power, adjust the cutting knives at a required distance to ring die for preventing the ring die.
2. The procedures for ring die assembling are contrary to the disassembling procedures.（for the details see as follows）.
3. Install the lifting device of the ring die to the lifting beam at the top of machine body and ensure that the eye ring is fixed, and then tighten the butterfly bolt to prevent the lifting beam from drawing out entirely.
4. Regulate the press roller to the place far away from the ring die.
5. Remove the access doors from two sides of the pellet mill, and screw the top die bolts into the bolt holes on driving flange of ring die.
6. Clean the end face, conic matching surface and inner surface of the ring die completely, and thoroughly clean the conic matching surface of driving flange of the ring die and end face of rotor.
7. Install the four centering pins to the ring die and then fasten it.
8. Fasten the tackle hook on the screw hole of the ring die and lift the ring die to corresponding installation height.
9. Move the ring die to the driving wheel flange, rotate the rotor to allow the centering pin of the ring die to align with the through hole of the rotor and ensure it is equally installed in the driving wheel flange of the ring die.
10. Fix the ring die with the nut, and then disassembly the lifting device of the ring die.
11. Screw in the other four fastening bolts for ring die and screw down them with centering-pin fastener of ring die by torque wrench on the cross in order. Refer to Fig. 2.8 and Torque List of Ring Die Fasteners for torque value.
12. The ring die must be assembled upright and aligned by dial indicator.
13. Screw the top die bolt slightly until it reaches the ring die.
14. Adjust the clearance between the three press rollers and the ring die properly（please refer to the section 2.3.8.4 for the adjustment of the press roll）.
15. Install cleaned feeding conic pulley fixing ring and rotation feeding cone to the outer end face of the ring die successively.
16. Install the access door at both sides of the pellet mill body.
17. Close the pellet mill gate.
18. Adjust the cutting knives to required distance from the ring die.

The ring dies of pelleting machines can be installed positively and reversely, however, it is suggested to install the ring die reversely in regular for operation such as after producing 1000 tons, so that the surface of the ring die and press rollers can be worn equably. It is recommended to use our fasteners for the ring die and apply lubricating oil or grease on the screws for a longer service life of the ring die when fastening.