1.The ring die hole of the wood pellet machine is blocked
Cause: Impurities mixed: small pieces of metal, small stones or bone fragments and other impurities may block the ring die hole. During the collection, transportation or storage of raw materials, if there is no strict screening, these impurities are easy to mix with raw materials and cause blockage after entering the die hole. For example, when dealing with feed raw materials, the source of raw materials is complex, and if not carefully screened, the small stones mixed in are easy to block the ring die holes. Moreover, even in a production environment, if the equipment is not properly maintained, small metal debris generated by the equipment itself can enter the die hole and cause blockage
2.Wood pellet machine ring die manufacturing process problems: some manufacturers produce rough ring dies, wood pellet machine ring die hole finish is not enough, pressing materials when the friction is large, easy to blockage. For example, some ring dies produced by small workshops, the precision is not enough in the ring die hole processing of wood pellet machine, the surface is not smooth enough, and the material is easy to adhere to the above when passing the ring die hole, and gradually accumulate to cause blockage.
3.The operator is not skilled: it does not produce according to the correct operating procedures, which will also cause ring die blockage. For example, it is not timely to pay attention to the gap of the wood pellet machine ring die roller (the gap is maintained at about 0.1-0.3m), resulting in uneven material extrusion, and some materials accumulate and block at the hole of the wood pellet machine ring die. In addition, if the feeding speed is uneven or too fast during the operation, it exceeds the normal discharge capacity of the wood pellet machine ring die, and it is also easy to cause the hole blockage of the wood pellet machine ring die.
4.Wood pellet machine ring die storage problem: If the wood pellet machine ring die is placed on hold for a long time after purchase, the surface of the die hole will rust, which will cause the pellet machine to block the ring die. Especially when the ring die is stored in a humid environment, the possibility of rust is higher, and the surface of the rusty die hole is uneven, which will hinder the normal passage of the material.
5.The raw material does not match the die hole of the wood pellet machine: for different feed raw materials, it is necessary to choose a press die with an appropriate aperture ratio, otherwise it may cause the die hole to be blocked. For example, the thickness of the raw material does not match the die hole, or the water content of the raw material is too high (generally not more than 13%), and if the process is not adjusted according to the characteristics of the raw material when pelleting, it is easy to cause blockage. If the raw material is too thick, it may be stuck in the die hole and cannot pass smoothly; The water content of the raw material is too high, and the material is easy to adhere to the ring die hole wall of the wood pellet machine, causing blockage.
solution
6.Clean up the blockage: whole corn or fractured corn can be slowly fed to observe the discharge situation, until 90% of the ring die hole has been discharged, it can be normal production. This method uses the shape and hardness of the corn to initially clean the ring die holes that are not too badly clogged, so that the material can pass through the ring die holes normally again.
Blockage prevention measures: iron debris removal, regular through holes and strict control of raw materials help to reduce the occurrence of blockage problems. Before the raw materials enter the ring die, set up multiple screening and impurity removal processes to ensure the purity of raw materials; Clean and maintain the die holes of the ring die regularly. Before stopping each shift, add oil material to the pelletizing chamber to squeeze it into the die holes to facilitate smooth pelletizing next time. When a new ring die is started, a new roller should be used, a feed with little friction against the die should be used, the feeding speed must be gradually increased until the product begins to flow through the die, and then steam should be gradually added.
7.Wood pellet machine mold wear
Reason:Use time is too long: use the wood pellet machine ring die for a long time, the Wood pellet machine ring die hole wall will gradually wear, the surface becomes not smooth. For example, in the production of biomass pellet, the material is continuously pressed, and the wall of the wood pellet machine ring die hole is constantly subjected to the friction and extrusion of the material, and the wear will become more and more serious with the increase of the use time.
Improper use: If the pressure on the wood pellet machine ring die is too large or uneven, it will accelerate the wear of the wood pellet machine ring die. In the operation of the wood pellet machine, if the pressure parameters are not reasonably adjusted according to the characteristics of raw materials and production requirements, so that the wood pellet machine ring die works under too high pressure, or the various parts of the ring die are stressed unevenly, it will lead to increased wear in some parts of the ring die.
Solution: Replace the wood pellet machine ring die with serious wear in time to ensure the normal production. At the same time, in daily use, the operating parameters should be reasonably adjusted according to the raw materials and production requirements to avoid excessive wear of the wood pellet machine ring die.