Introduction to the Single-Screw removal tool kit

As an essential part of FAMSUN's extruder machinery, the single-screw extruder (for aquafeed, raw materials) is widely used in feed plants. The removal of screws has always been a problem in the operation of the extruder machinery. Every manufacturer may have its own removal tool kit, yet few can offer satisfactory solutions.

To develop new efficient removal tool kits, the following three factors should be taken into consideration:

To begin with, during peak production season, the machines have to stay operational as long as possible to cut cost rendered by downtime. To remove the screw head for instance, for lack of efficient methods, it usually takes 30 minutes to one or two days with nothing but temporary tools at hand. Considering the time consumed, it is of significant necessity to make improvements in the removing process to meet the production agenda.

Secondly, to lengthen the service life of the screw head, it is necessary to minimize the damage done to the screw head when it is being knocked off.

Besides, high degree of automation is necessary. So far some of FAMSUN's raw material extruders have been automatized, and these machines are more operation-friendly than they used to be. But simpler, faster removal tools are still needed to improve the competitiveness of FAMSUN's machinery.

Currently, the removal tool kits available are for raw material extruders. As for TPH/PHY200, TPH260/PHY260 series extruders, the removal tool kit in use does not deliver satisfactory results.

Because of its structure, the tool can only remove the first section of the screw. Besides, specific leads of the screw are also required by current removal tools. And it also takes a lot of labor and time to manually turn the screw lever, especially when some of the screws haven't been removed for years. For single screw extruders for aquafeed, however, the aforementioned method does not work out. See the structure of the screw for aquafeed extruders:

Compared with earlier versions, the up-to-date removal tool kit can remove single screws of all types TPH200/260; PHY200/260; SJPS135/165/215/265), not just the first section of certain type of screws. The time needed to remove one section is less than 20 minutes.

Its structure and operating principles are as follows:

The position-limit mechanism is used to prevent the spindle from being damaged because of the friction caused by the spindle in the block and the main spindle (the current structure of the extruder only has the limit screw to bear backward thrust; without a limit screw to counter the forward force, the spindle can only take in little pulling force forward).

One thing to be noted: The position-limit device should be locked tight before this removal took kit is used.