Structural Features on Chaoyue SWFP Series Fine-grinding Hammer Mill

The materials to be ground are fed in from the feeding inlet on top of the grinding machine by a matching feeding mechanism, and enter the grinding chamber from the left or right side via a guide plate. The materials are ground gradually under the impact of hammers rotating at a high speed and the rubbing action against the screen, then pass through the screen apertures under the effects of centrifugal force and airflow, finally were discharged from the outlet at base frame.

Of a welded steel structure, the hammer mill consists of a base, an upper housing, a rotor, an access door, a screen hold-down mechanism, a feed guiding device and etc. The inlet and outlet locate at top and bottom centers respectively. The driving motor and the rotor are mounted on same base, and direct driving is realized by means of an elastic straight pin type coupling or an elastic pin type coupling (for SWFP66×125).

Structure of the key component parts

Rotor
The rotor consists of a main shaft, hammer carrier discs, shaft pins, hammers, bearings and etc, and it is main moving part of grinding machinery. Only those hammers with a thickness of 4 mm can be used for hammer replacement, and they must be fixed in accordance with the hammer arrangement plan, additionally, the difference between the total mass of the hammers of the two symmetrical groups should not exceed 2g.

Screen
Fitted inside the screen hold-down mechanism, the screen is easy to be replaced.
Feeding guide mechanism
It guides the feed flow to enter the grinding chamber from the left or right side of the machine. Diversion of the material guiding plate is controlled by the cylinder, and motor rotation direction will be automatically changed to suit the feeding direction.
Safety guard
To avoid any accident in operation, the access door is equipped with an interlocker so as to ensure that when the access door is opened the motor can never be started. (Fig 1)

Structural Features and Working Principle on SWFL82B

As the best grinding machine manufacturer, Muyang has made its efforts to make its all machines with high qualities. SWFL82B Vertical Pulverizer, as a new type of equipment for large-, medium- and small-sized feed mills, is with full equipments which make it more efficient.

SWFL82B ultra-fine pulverizer mainly consists of a stander, a grinding system, a grading system, a feeding system, a pneumatic opening mechanism as well as a driving part for grinding of the principal grinding machine and a motor driving part for grading. The grinding system is composed of a main shaft, a grinding disc, a geared ring and a grinding chamber; the grading system is composed of a grading impeller shaft, a grading impeller, a convex cover and a discharge chamber. The main motor runs in vertical driving way; the frequency conversion motors with frequency converters are used for both grading and feeding, so as to realize speed regulation and remote control.

After preliminary cleaning and magnetic separation, the raw materials (＜1 mm) enter the grinding chamber from the screw feeder for grinding. Under a high-speed rotation of the grinding disc and an action of centrifugal force, the materials are ground by impacting of the hammer knives on the grinding disc, and fly to the surrounding geared ring in a very high speed. Since the clearance between the hammer mills knives and geared ring is very small, the airflow between the hammer knives and geared ring varies instantaneously with the change of tooth forms. The materials in the clearance are further ground under the repeated action of alternating stress. The ground materials are taken by airflow to the space between the inner wall and the dividing flow cover from the grinding disc, and then enter the grading chamber; the materials are graded under the collective action of rotary grading impeller, wind power and centrifugal force, and the separated course materials return to the grinding chamber for regrind from the inner chamber of the dividing flow cover, while fine materials (finished products) are sucked into the grading impeller and enter the discharge chamber, and then enter the collection system from the discharge outlet.

Muyang SFSC Series Grinding Machine

This grinding machine is a structure of welded steel plate, the motor and the crusher rotor are installed on the same base, directly driven by an elastic pin coupling; the rotor is calibrated by dynamic balance, it can rotate both co rotation and reversion, so as to prolong the service life of wearing parts. The operation gate is equipped with a safety interlock device to ensure that the motor cannot be started while the operating gate is open. The feeding inlet is located at the top of the crusher and can be matched with different feeding mechanisms. The hammers are arranged symmetrically.

The raw material on the SFSC Series grinding machinery to be crushed (ground) is fed from the feeding inlet at the top by means of a feeding mechanism, which is matched with the machine, and enters the crushing chamber through the feeding guide plate from the left or right, then ground gradually by the beating of the high-speed hammers and the friction of the sieve plates, and discharged from the outlet on the base through sieve apertures by centrifugal force and airflow.

Muyang grinding machines are all in high technologies with full function, and every part on the machine is designed carefully and strictly.

Base: for connecting and supporting each part of the crusher and making them integrated. The crushed material is discharged from the base.

Upper housing: the upper part is completed with a feeding inlet and the lower part is linked with the base. Both sides are equipped with sieve plates, and the crushing chamber is formed by the sieve plates together with the rotor and the raw material is crushed in such chamber.

Rotor: composed of main shafts, hammer carrier plates, pins, hammers and bearings, which are the major moving parts of the crusher. The rotor rotates in high speed, and a dynamic balance calibration shall be conducted after assembling but without pins and hammers.

Operation gate: It is necessary to start the operation gate when replacing sieve plates or hammers. The sieve plates are held down by the operation gate.

Feeding guide mechanism: guide the materials to enter the crushing chamber from the left or right. The feeding guide plate is reversed by control of the cylinder with an electric controlled valve and the motor rotation direction is changed automatically by a limit switch to make it comply with the feeding direction, to ensure a tangential feeding.