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Structure and working principle of scrap crusher

Time:2018-10-15 Author:Hongyuan Machine

Hammer crusher is a widely used scrap crushing equipment. According to the different arrangement of the rotor, the hammer crusher is divided into vertical and horizontal. The vertical crusher is characterized by small size and compact structure. Compared with the horizontal crusher, its power and productivity are lower, and the bulk density of the steel after crushing is larger. The vertical crusher is equipped with a pre-crushing device for pre-treating large-size recycled steel. The rotor of the horizontal crusher is horizontally arranged and is characterized by transmission power and productivity. Compared with the vertical crusher, the horizontal crusher is more widely used. More than 90% of the existing recycled steel crushers in the world are horizontal hammer crushers.

The horizontal scrap crusher mainly consists of a rotor system, a feeding device, a discharging device, a main transmission device, a dust removing device, a main body casing and an inner lining, wherein the rotor system is a core component of the scrap crushing machine. The rotor system is composed of a plurality of circular hammer disks, a hammer head that is freely rotatable between the hammer disks, and a plurality of spacers. The inner hole of the hammer plate adopts a square hole structure with the same shape as the main shaft to prevent the hammer plate from being worn due to relative movement during the operation of the rotor. The two ends of the spindle are supported by two large roller bearings. The disc rotor system has the following advantages:

1) It can effectively handle the scrap with higher density;

2) The unbreakable material is not easy to enter the main body, but is blocked in the feeding oblique opening and is easy to remove;

3) The multiple hammers distributed between the hammer discs are staggered and orderly, and the crushed scrap is efficient;

4) The baffle installed at the gap of the hammer can not only improve the service life of the hammer plate, but also store energy for the flywheel and improve the hammering and shredding ability of the hammer.

The fuselage of the scrap crusher is made of extra-thick steel plate and diagonal reinforcement to ensure the overload requirement of the machine. The lining plate and the hammer head are made of special wear-resistant materials to improve the service life. The hammer head adopts the movable installation structure. Once it encounters the unbreakable material and enters the crusher, it can be bypassed and avoided. At the same time, the non-breakable material discharge door specially installed by the crusher can be opened and the machine can be removed from the machine, thereby reducing the pair. The degree of damage to the machine. The scrap crusher is a machine that uses the high-speed impact of the hammer to break the scrap. The scrap crusher rotor rotates at high speed under the driving of the motor, and the scraper placed in the crushing chamber is alternately struck by the hammer head arranged along the circumferential direction and the axial direction of the rotor, and the space formed between the lining plate and the hammer head will be The scrap is torn into a broken piece that meets the requirements. The broken scrap obtains kinetic energy from the hammer head, impacting the screen rod or other scrap steel at high speed, and the scrap steel smaller than the gap of the screen strip is discharged from the gap to the conveyor, and the scrap larger than the gap passes through the hammer and multiple impacts on the screen strip and the scrap steel The crucibles are broken together and discharged from the sieve gap after reaching the qualified particle size.

The main technical specifications of the hammer-type scrap crusher include productivity, driving power, rotor speed, bulk density of the scrap after crushing, and the quality of the machine. The productivity of the hammer crusher, the mechanical properties of the recovered metal are related to the number, size, hammer weight and hammer geometry of the breaker, the rotor speed of the crusher, the discharge area of the sieve, and the structural form of the machine. The speed of the hammer crusher rotor depends on the blockiness of the finished product of the crushed and recovered metal and the peripheral speed required for the crushing hammer. The peripheral speed of the breaker is generally between (20-120) m/s. The higher the speed, the smaller the block size of the recycled metal finished product. The speed of the crusher rotor is generally between (300-1000) r/min, but it must not exceed the critical number of revolutions of the system. The driving power of the hammer crusher is closely related to the blockiness of the recovered steel after crushing, the rotor speed, the flywheel speed and the productivity of the crusher.
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