Fertilizer High Performance Mixers (HPM)
HPM are a line of double rotor mixers customized specifically for the fertilizer industry. Double rotors are used for fast mixing and cycle times (typically one minute), and in these larger sizes, they are better for end to end transportation of minors, adding liquid, and hopper design.
Fertilizer is corrosive and production is seasonal. For these reasons parts in contact with the product and operation parts that can rust that will inhibit operation, are of Tp304 Stainless Steel.
The housing sides and ends, rotors, discharge door, discharge door shafts and internal linkage are all stainless steel. Stainless will be as rolled finish, no welds ground nor discoloration removed.
The mounts for bearings, drives, air cylinders, lifting lugs, and air cylinder guards are carbon steel. The entire end plate will be painted light grey. Guards will be safety yellow.
Discharge is air operated drop bottom with limit switches for door position. Air cylinders hold the door tightly in position to prevent leaking. There are 22 specific parameters used for door and seat design so they work properly. Gaskets are mechanically held in place. Typical seal life is 3 years.
Side doors will be bolt-on with the option of hinged and clamped with safety switch.
The mixer is supported by side brackets and the hoppers hang from the mixer. Hoppers over 5000 lb. (2400 kg) required additional support. There is no dynamic load.
Machines will have extra height and ability to add pipes for adding liquid. Liquid systems can be supplied.
All bearings are sealed–do not grease.
Rotor seals are a packing gland, spring loaded with stainless spring washers to prevent leaks from starting. Seals always fail while in production, so being able to do a quick fix without having to take the machine apart, is a big advantage. They can groove the shaft which can be repaired or prevented with a sleeve. Hardened shaft sleeves are available.
Drives: each shaft is driven independently as rotors are not overlapped and do not need to be synchronized. The drive is a shaft mounted and all helical up to 8 ton machines. Over that we may use planetary.
Air controls and piping are included as follows: Dual solenoid to operate discharge, piped to cylinders. Dump valve for customers connection. (OSHA requirement). 24VDC. Devices will be wired to NEMA 12 junction box with terminal strips for customer field wiring.
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