What are the feeding components of the extruder
Extruder is the main equipment for producing light alloy (aluminum alloy, copper alloy, magnesium alloy) pipes, bars, and profiles. Its emergence and development only lasted for over a century, but tremendous changes have occurred. From a few meganewtons of manual hydraulic press to a 200 meganewtons of fully automatic hydraulic press. The variety of extrusion machines has also greatly increased. The production capacity and quantity of extrusion machines reflect the production technology level of an enterprise.
The extruder has two types of feeding components, horizontal and vertical, equipped with a hopper for receiving and temporarily storing the raw materials to be extruded, and conveying them to the screw. To ensure smooth movement of raw materials and avoid "arching", installing a mixer or using a wide discharge port in the hopper will help the mechanism maintain uninterrupted and uniform feeding conditions. It is very important for the feed mechanism to maintain uniform feed. Because in order to ensure the normal operation of the extruder and the quality of the extruded material under uniform conditions, uninterrupted and uniform feeding is a necessary prerequisite for the normal operation of the extruder.
Fuck him.
Generally speaking, the screw is an important component of an extruder, which not only determines the solidification and gelatinization strength of the extruder, but also determines the quality of the finished product. Different screws have different extrusion functions. The extrusion function of the screw depends on the design parameters of the screw. Various design parameters of the screw.
Pitch is the distance between the corresponding points on two adjacent thread contours; When a thread rotates once, the distance it advances in the axial direction, measured as a multiple of the pitch, is called the number of positive thread grooves or the number of thread heads. Single screw, pitch equal to pitch; Double threaded screw, with a pitch equal to twice the pitch; The pitch of a screw with three threads is equal to three times the pitch of the thread. Multi threaded screws can increase load-bearing capacity and viscous flow. During the continuous mixing and conveying of materials, the screw generates mechanical friction and heat, causing the material to melt.
Screw insert.
The screw sleeve wrapped around the screw can be made into a whole structure, but it is usually equipped with a clamping sleeve, which can be used for circulating heating of steam or superheated oil, as well as for circulating water cooling. The purpose is to enable the extruder to accurately adjust the temperature of each working section. Most screw sleeves are equipped with pressure sensors, temperature sensors, and temperature control devices. The inner surface of the screw sleeve is usually made into a groove shape, some are straight grooves, and some are spiral grooves. Spiral grooves generate enhanced downstream flow, while straight grooves block downstream flow. So straight grooves can cause a decrease in flow velocity, but their mechanical shear effect is greater. The gap distance between the screw and its sleeve is usually kept to a small extent to reduce leakage flow.
Die head.
At the end of the screw insert, templates with various shapes of holes are usually assembled, commonly referred to as die heads. The mold has a dual function: to shape the extruded material into the desired shape; Used as a throttle valve to increase the pressure in the ripening zone of the extruder. Determining the geometric shape of the die hole is crucial for the shape and quality of the extruded product. We have developed and applied various one-way forming molds, such as cylindrical hole molds, slot hole molds, annular hole molds, and two-way forming molds. The feed in the dual pass forming mold comes from the single pass forming outlet of two extrusion machines, which can be processed into dual color or dual flavor extruded products.
