How to Repair Automatic Dog Food machine Die Head and Screw Faults?

First, locate the faulty component by examining the particle quality: if the particle size is uneven or some die holes are not dispensing material, it's mostly a die head malfunction; if the particles are generally loose and dull, it's often related to screw wear.

Common die head malfunctions and repairs: 1. Die hole blockage or increased wear. When the die hole is blocked, disassemble the die head and clean the blockage with a special drill bit (slightly smaller in diameter than the die hole). Be careful not to use excessive force to avoid damaging the die hole. If the die hole wear has increased (more than 10% of the original diameter), minor wear can be repaired by electroplating, plating a layer of wear-resistant alloy onto the inner wall of the die hole to restore the diameter; severe wear requires replacement of the die head. 2. Poor sealing between the die head and the extrusion chamber, causing raw material to leak from the gaps, affecting particle forming. Check if the sealing gasket is aged or damaged; if aged, replace it with a high-temperature resistant gasket; if the sealing surface is deformed, grind the sealing surface with a surface grinder to ensure a tight seal.

The key to repairing screw malfunctions is wear and deformation: Screw blade wear leads to a decrease in raw material mixing and conveying capacity, resulting in loose particles. Minor wear (less than 0.5mm) can be repaired by welding with wear-resistant alloy and then polishing to restore the spiral shape and size of the blades. Severe wear requires replacement of the screw; it is recommended to choose an imported wear-resistant alloy for the new screw to extend its service life. Screw deformation is often caused by overload, manifesting as screw bending and blade deformation. This type of fault is difficult to repair and usually requires replacement of the screw. During replacement, ensure the clearance between the screw and the extrusion chamber meets the requirements (0.1-0.3mm) to avoid excessive clearance leading to material residue.

After repair, trial production and debugging are necessary: ​​install the die and screw, feed raw materials, and observe the size, hardness, and surface condition of the particles. If the particles are uniform in size, smooth in surface, and not easily broken, the fault has been resolved. In daily use, proper maintenance of the die and screw is essential: clean residual raw materials promptly after each production run to prevent charred residue from adhering; regularly lubricate and maintain the screw and die; apply rust-preventive oil to the die to prevent rust; avoid mixing hard impurities into the raw materials to reduce component wear.

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