Ring die cracking in rice husk pellet machine is a common problem that can be caused by a variety of factors. Here are some of the main reasons and their solutions:

1.Ring die cracking causes

(1) Incorrect use and operation

Wear of the hoop and the drive wheel: the hoop working face has a bright spot and the drive wheel working face has wear marks, which may lead to the inner clamp of the hoop being worn or deformed.

die liner wear or deformation: Die liner wear or deformation can also cause the ring die to crack.

Transmission key wear: Transmission key wear will cause the ring die impact opening.

(2) Equipment parts damaged

Spindle bearing damage: spindle bearing damage, spindle runout may lead to ring die cracking.

Insufficient elasticity of the butterfly spring: the elasticity of the butterfly spring is not tight, which makes the spindle shake and causes the ring die to crack.

(3) Environmental and material factors

The effect of the iron removal device deteriorates: The effect of the iron removal device deteriorates the working face of the ring die, which causes the ring die to crack.

Press roll installation is not in place: the press roll is not installed in place, and the relative deviation of the press roll and the ring die axial working area causes the ring die to crack.

(4) Other reasons

Excessive or uneven feeding amount: When the feeding amount is too large or the small aperture ring die is replaced, the feeder is adjusted in time, and the pelletizing production is unbalanced, resulting in an increase in the load of the ring die and the cracking of the ring die.

No washing during shutdown: When the ring die is shut down for a period of time without use, there is no "washing mold", the particles in the ring die hole become hard, and the next discharge is difficult, and the extrusion pressure is too large, resulting in the cracking of the ring die.

2. Solutions

(1) Maintenance and replacement of damaged parts

Drive wheel replacement or repair: Timely replacement of the drive wheel or repair, or increase the ring die assembly face fit dimensional tolerance.

Check and replace die liner: Check and replace die liner in time.

Replace the transmission key: measure the gap between the key and the keyway regularly, and replace the transmission key in time.

Replacement of spindle bearings: Timely replacement of spindle bearings.

Add or replace the butterfly spring: Add or replace the butterfly spring.

(2) Adjust and optimize operations

Adjust the feed amount and ring die clearance: Adjust the feed amount to ensure reasonable clearance between the ring die and the press roll to avoid hard contact.

Install feeding scraper: Install new scraper to avoid unevenly high pressure on the ring die working face when fiber material is increased.

Use a wooden hammer to load and unload the ring die: Avoid using hard steel tools to hammer the ring die directly and use a wooden hammer.

Timely cleaning: When the ring die is shut down for a period of time and is not in use, it should be "washed" in time to prevent the particles in the die hole from hardening.

3. Regular inspection and maintenance

Check the effect of iron removal device: Check the iron removal device every shift to ensure that its effect is good.

Check the installation of the press roll: ensure that the press roll is installed in place to avoid the relative axial deviation of the die roll working area.

Through the above method, the problem of ring die cracking of rice husk pellet machine can be effectively solved, the service life of the equipment can be extended, and the production efficiency can be improved. I hope you find this information helpful