Hammermills

INSTITUTE OF NEW TECHNOLOGIES AND AUTOMATION OF CONSTRUCTION MATERIALS INDUSTRY

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Design and operation principle

The body frame of the hammermill is equipped with hinged doors for easy replacement of wear parts. The hosing area of the frame is protected by segmental lining. The vertical type rotor is installed at bearing supports of the mill body frame. The low bearing support is taken out of the crushing area to improve operating factors of the bearing. Breaker bars are fixed with hinges. The reverse rotor rotation increases the operational life of the breaker bars.

Material for crushing is fed by transporting device through a charging hopper. Crushing is achieved by application of impact action of the breaker bars on raw material.

“Inta-Stroy” produces four types of hammermills in accordance to fineness ratio:

coarse (i = 8… 16)

medium (i = 16… 32)

fine (i = 32… 64)

subsieve (i = 64… 128)

Each type of hammermill is characterized by definite number of breaker bars, rotor speed and opportunity to control the degree of grinding by changing the rotor speed. It is necessary to install a frequency drive.

The main advantages

high fineness ratio (i = 8… 128)

increased operational life of breaking bars

easy replacement of wear parts (breaking bars, lining)

protection of bearing system from dust, occurring during crushing

optional installation of frequency drive (at the customer’s request)

Order

Technical characteristics

Capacity, up to t/h		2,5	5	10	20	40	60	80	100
Drive power, kW		11	15	22	45	75	90	150	160
Max. Size of feed lump, mm		70	90	120	150	200	250	300	350
Fineness ratio	coarse	8...16
	medium	16...32
	fine	32...64
	subsieve	64...128
Number of breaker bars	coarse	3
	medium	4
	fine	5
	subsieve	6
Impact velocity, m/s	coarse	25...30
	medium	30...40
	fine	40...50
	subsieve	50...70
Nominal rotor diameter, mm		320	400	500	800	1100	1400	1600	1800
Rotor speed, r/min	coarse	1500	1200	960	650	500	400	350	300
	medium	2100	1650	1350	850	620	480	420	380
	fine	2700	2150	1750	1080	780	620	540	480
	subsieve	3600	2900	2300	1450	1050	820	720	630