Below I will explain in detail through several common reasons for the failure to form granulation, hoping to be helpful to the majority of customers.

1. Raw materials:

(1) Generally speaking,softer wood chips such as pine wood are easier to granulate. If the raw material is very hard or the raw material is flour-like fine powder (the specifications of wood chips are best 1-2mm), then it is necessary to add wood shavings and can basically be formed.

(2) Moisture control: The moisture content of wood chip raw materials should be controlled at around 13% (currently, the market generally requires 8% moisture in finished pellets). Due to the characteristics of raw materials, the specific value should be derived based on your actual production situation (the recommended moisture range is between 10-20%). For wood chip granulators such as pine, fir, and eucalyptus, our pelletizer requires moisture of 13%~17%.

(3) Raw material principle issues: Different raw materials such as wood chips, straw, paper scraps, etc. have different properties and different fiber structures, so the difficulty of forming is different.Materials that are more difficult to press, such as palm.Another thing is that if it is a mixed material, the mixing ratio of various components will also affect the forming rate.

2. The mold compression ratio does not match the characteristics of the raw materials:

Some companies believe that the compression ratio is the ratio of the length of the mold hole to the diameter of the mold hole, while others call this aspect ratio.Some companies believe that the compression ratio is the ratio of the square of the diameter of the trumpet hole to the square of the diameter of the hole.No matter which method is calculated, the compression ratio will be due to the fact that after the material is squeezed and rubbed with the mold and pressing wheel during the production process, its pore size will become larger, while the die hole length will become shorter and its particle mass will decrease.Therefore, the compression ratio of the abrasive tools provided by the manufacturer to users is only customized according to the commonly used materials.Therefore, customers want to find the right compression ratio based on their raw materials, which requires customers to pay attention to the production practice.Only in this way can we better grasp the quality of particles and improve the working efficiency of the equipment.The mold compression ratio does not match the characteristics of the raw materials

3. Adjustment of the gap between the pressing wheel and the abrasive tool:

Generally, the gap between the pressing wheel and the abrasive tool is controlled to be 0.1~0.3mm. If the gap is too large, the pressure will not be enough and the molding cannot be extruded.If the gap is too small, the backlog particle density and smoothness may be better, but it will increase the friction of the mold press, reduce the life of the abrasive tool and affect the production of the granulator.

(1) Adjustment of gap between flat mold pelletizers There are currently two types of flat mold pelletizers on the market:

One is to fix the press wheel and rotate the abrasive tool. There are two screws on both sides of the silo of this flat mold pelletizer. The gap between the press wheel and the grinding disc is adjusted by tightening the screws. The smaller the gap, the higher the relative hardness of the particles. This flat mold pelletizer is a pelletizer for making feed, and making wood chips affects the life of the pelletizer.

The other type is fixing the abrasive tool and the pressing wheel rotates. This flat mold granulator shows that in the production practice of pressing wood chip particles, it is a relatively economical and practical granulator. Its gap adjustment is completed by tightly fixing the pressing rod on the spindle, which is relatively convenient to operate.

(2) Adjustment of gap of vertical ring mold granulator:

Vertical ring die wood pellet machine is one of TONY's main products and is currently the most durable equipment for biomass fuel granulation in China. The adjustment of its press wheel and abrasive tools is completed by adjusting the screws on the press wheel fixing device.

Vertical ring die wood chip pellet machine

①. Loosen the press roller adjustment bolt to adjust the press roller to the state where the outer circular surface of the press roller is close to the inner circular surface of the ring mold;

②. Adjust the eccentric shaft of the press roller in sequence so that the gap between each press roller and the ring mold is appropriate, and gradually adjust the gap.

③. Just tighten the adjustment bolts.

In use, the pressing roller skin is sacrificed because the price of the mold is dozens or even hundreds of times that of the pressing roller skin. Therefore, when a reasonable gap is used, the hardness of the pressing roller skin cannot be too high, that is, the wear resistance of the pressing roller skin cannot be higher than that of the ring mold. So how do you judge that the gap between the ring mold and the press roller is 0.1-0.3 (of course this is just a data, easy to describe)? Based on TONY's years of production and practical experience, two people need to cooperate with each other. When clicking on the motor, it is best to hear the mold and the pressing rod reach a state that is in contact with the pressing rod during the contactless process of the mold and the pressing rod. (Not professionals should not practice to avoid equipment failure!)

During the production process of the equipment, the materials used must be cleaned to avoid the materials mixed with large pieces of sand and gravel, sand particles, iron blocks, bolts and iron filings. Because these inclusions accelerate the wear of the ring mold, and a large amount of hard inclusions will cause the ring mold to be subjected to multiple stresses, causing the ring mold to be fatigued. When the force is subjected to a certain time, the ring mold will explode.