Impact crusher principle and application

Impact crusher during the impact of the material has the ability to make selective fragmentation than other types of crushers crushing products with more cubic content, but also

has the characteristics of large crushing ratio, simplified crushing process, and thus in the crushing industry has been rapid development, has been widely used in various

related industries.

First, the impact crusher

The so-called impact mobile crushers for sale is in the free state of an object by hitting power, and along its natural fissures, bedding planes, joints and other weak part of the selective

surface broken and crushed. It is different from the hammer crushing of objects in a constrained state by the striking force, but also with other cuts, economic pressure,

grinding crushing different, so the lowest energy consumption in the crushing process, and because of its ability to effect selective fragmentation to the monomer separation of

useful minerals and get more cubic product role.

Application of the principle of the impact of impact Feeding machine is the use of high-speed transfer of the hammer on giving crushing chamber materials for high-speed impact, so that

the material occurs impact crusher, and to the impact of the material after the block is high speed toward the back plate, the material being again after impact crusher, hammer

and from the back plate springs back crushing blow District repeat the above process, while the material in the hammer back and forth between the back plate and in between there

is the role of the collision impact. When crushed material finer than the gap between the hammer and the impact plate, it is discharged from the lower part of the machine is

broken products.

For different grain crushing energy materials which are different, the more material the small internal defects due to a decrease in the energy required for its greater

fragmentation. According to the relationship between energy and linear velocity formula: A = mra.

With the extractive capacity, post-mining material block size is increasing, while the single-rotor impact crusher due to its rational structure and other factors limit the feed

particle size increases, so the development of a dual-rotor impact crusher. In order to improve the role of the second rotor height has developed a set of dual-rotor impact

crusher, hammer wear and energy consumption according to the rotor speed and the relationship, the first at a lower rate on the material crushing , while the second rotor at

high speed on the material in the crushing, crushing ratio improved.

Vertical impact crusher is crushing on the material aspects of the use of impact crusher representative. We know that the hammer rotary hammer wear line with the increase in

speed non-linear growth, while crushing hammer when the line speed is high, the relative quality of lighter materials can not enter the high-speed rotary hammer effectively

combat zone ( just at the maximum line speed range), resulting in crushing effect is reduced and hammer wear increased. Vertical impact crusher center feeding method used to

enter the material after the initial speed close to zero, and gradually accelerated projectile out from the rotor body for impact crusher, impact crusher improves the

effectiveness and reduce the wear of wearing parts . This crusher has evolved into mechanical and self lined two categories.

Second, the impact crusher

As mentioned above, impact crusher exist in the actual use of the material is uneven, and easy "run chunk" of the situation, the impact hammer crusher will enable these problems

solved.

Material from the inlet to feed human inside, into the hammer workspace, subject to the impact of high-speed rotary hammer and broken, while the material in the back panel of

high-speed crash Youyi further be broken, and bounced back from the back plate hammer Head workspace, continue to repeat the crushing process, and eventually enter hammering

area (between the hammer and grate work area), the grate further by hammer hammering and abrasive. Practice has proved that the material is not a cycle in the rotor to be fully

broken, but to go through several cycles before they get fully broken. Bulk material during the impact may not fully broken. Counterattack plate and hammer can be passed between

the plates role of crushing roll, this effect has been confirmed by actual experiment (no grate in the case of its largest product size does not exceed the hammer plate and back

plate size of the gap).

Third, the impact hammer crusher structure type

Impact hammer crusher mainly by the body, rotor, grate body and drive four major components. Below these four respectively, for a brief majority.

3.1 Body

Its main function is to support the rotor and the grate of the body to achieve the broken material and ensure the crushing chamber large enough so that the material can be fully

broken. In order to prevent wear of the inner wall of the body material, the wear of the inner wall of the body are fitted with lining. Should be able to open the back plate to

the appropriate position (small size machine back plate opening and closing by the crane to complete, large-sized machines through the hydraulic system to complete), and other

back liner for easy replacement liner. Open the access cover can replace the hammer. In addition, open the access door can be removed from the body replacement grate grate.

Observed door open grate can be checked hammer and size of the gap and hammer wear.

, The choice of excellent anti-wear materials provided.
3.2 drive
Its function is the sub torque Yu movement, acceleration torque of the rotor. Usually V-belt drive: Winding motor ~ pulleys, rotors. This transmission mode can be obtained in a

smaller starting current high starting torque, absorbing crusher vibration generated when the work has a certain carrying capacity and overload. Pulley expansion sets are used

to connect, easy handling, with overload protection. Moreover, large pulley on the rotor wheel and take off role in ensuring the hammer plate and the back plate between the roll

effect.

3.3 Rotor
The rotor is the major crushing the machine tool, the general structure type and arrangement of hammerhead form.

3.4 grate body

Grate of the body is the material to withstand hammering the carrier, but it is also the material discharged from the constraints of product size body. It has grate plate and

grate two structures, the latter through Ga swab satisfy willing contempt offend strike line and  blind anxious drought Torr irresolute take along Ã?

Back plate back liner placement and structural design based primarily on the impact hammer crusher works, to ensure effectiveness and impact back plate back plate and hammer

plate between the roll effect. At home and abroad in the same type of machine body located above the grate of the back plate has a convex portion Q, K width of the grate of the

body because the upper edge of the support plate above the grate, in direct contact with the material, easy to wear. To reduce the wear and tear in the back liner adds convex

portion Q, the part is exactly aligned with the edge of the support plate, the main protective effect.
Fourth, the impact hammer crusher main working parameters to determine

Impact hammer crusher main working parameters, including speed, output and motor power.

4.1 Line Speed
Impact hammer crusher line speed is based on the nature of the materials, crushing ratio requirements, the machine structure and other factors, and considering the hammer worn

selected.

Line speeds increase, increased impact velocity, increasing the chance of the material blow, helps to get finer granularity, increase production capacity. However, too high a

linear velocity of the material into the hammer has hindered effectively combat areas, so that the role of sleep head of the material is cut more bi! State and increased wear of

the hammer, reducing energy utilization.

Reduce line speed can reduce the wear of the hammer, but also increases the material in contact with the hammer plate of probability, increase the hammer plate wear. Line speed

is a comprehensive consideration of the selection process. In view of the hammer and grate it by hammering between the body and grinding, cutting action limits, the line speed

at 30 ^-40m / s between the selection is more appropriate.

4.2 Production
Affecting the yield of many factors, such as: the requirement for crushing ratio, speed selection, the physical properties of materials, particle size distribution, the machine

structure and so on.

4.3 Motor Power
In addition to considering the power to determine the nature of the material, crushing ratio, processing power and other factors should also be considered when the start-up

phase hammer asymmetric rotor moment of inertia of the body large impact on power. Moreover, given the power to take a hammer impact crusher can meet the Ministry of energy

consumed completely final rapid recovery requirements.

Five, the impact hammer crusher basic structure to determine the parameters

5.1 the diameter and length of the rotor
The diameter of the rotor body and maximum feed size information. According to the impact theory, particle size and feed hammer proportional to the mass, and with the hammer

effectively combat height (ie the height of the rotor body exposed hammer) are closely related. In addition, taking into account the impact hammer crusher work process there is

a certain role when rolling, turning their anger must have sufficient capacity, which requires the diameter of the rotor body with feed particle size increases.

Typically, the diameter of the rotor body and the ratio of the maximum feed size is 2 ^ -4, take small mainframe. The length of the rotor is taken according to the production

capacity of a given size.

S.2 hammerhead
a. hammerhead hammerhead shape and the height of the rotor is exposed h.

Design, hammer face should in principle be the rotation axis of the rotor in order to achieve a positive impact on the material hammer. Taking into account the wear compensation

or hammer weight restrictions, a slight deviation. Hammerhead ends arc surface design should consider the introduction of bite angle a. This paper recommends a 5-100. Too large

bite angle so that the hammer premature wear and reduce the life of the hammer. The arc length is mainly based on the type of hammer weight required strength corresponding

hammer shaft diameter, and take an arm fixed thick. Hammer shaft and arm strength assessment can hammer in working condition in equilibrium when the force is calculated, and

when working with hammer centrifugal force as the payload checking.

Hammerhead exposed rotor body height h that is highly effective in combating the hammer. From the point of impact effects and hope h large production capacity, especially for

bulk materials, to achieve the desired impact, h is bound to large, in theory, if the force of the impact gob gob right through the center of gravity. Then shocks the best

results. Consideration to the structural design is reasonable, and the power consumption increases, the person must be properly increased. At the same time people can not be too

small, too small h increased the hammer on the material increases the abrasive cutting, it will affect the handling capacity of the crusher exacerbated hammer wear.