8 Things You Want to Know About Hammer mill Crusher, get it now

Hammer mill crusher is a kind of equipment to crush materials in the form of impact. This article will tell you: what is hammer mill crusher, how does a hammer mill crusher work, what are the parts of hammer mill crusher, How to replace hammer mill crusher parts, how to choose hammer mill crusher supplier.

Hammer mill crusher is suitable for crushing medium hardness materials such as limestone, slag, coke, coal and other materials in medium and fine crushing operations in cement, chemical, electric power, metallurgy and other industrial sectors.

What is hammer mill crusher

Hammer mill crusher is a kind of equipment to crush materials in the form of impact, in two forms: single rotor and double rotor. It is a crusher for direct crushing of materials with maximum size of 600-1800 mm to 25 or less in one section.

Hammer mill crusher is suitable for crushing medium hardness materials such as limestone, slag, coke, coal and other materials in medium and fine crushing operations in cement, chemical, electric power, metallurgy and other industrial sectors.

What is hammer mill crusher
What is hammer mill crusher

The hammer mill crusher is mainly composed of frame, rotor, screen, strike plate and adjusting device, etc. The hammer plate on the rotor is driven by the motor to rotate at high speed, and the material is crushed by the high speed impact, impact and shear of the hammer plate after entering the crushing cavity. The finished material is discharged from the machine through the screen bar at the lower end of the machine, and the size of the discharged material can be adjusted by adjusting the screen bar gap.

How does a hammer mill crusher work

What is the working principle of hammer mill crusher? Hammer mill crusher is suitable for crushing medium hardness materials such as limestone, slag, coke, coal and other materials in cement, chemical, power, metallurgy and other industrial sectors.

The hammer mill crusher in working picture
The hammer mill crusher in working picture

The main working part of the hammer mill crusher is the rotor with the hammer (also known as the hammer head). The rotor consists of a main shaft, a disc, a pin and a hammer.

hammer crusher header
hammer crusher header

The hammer mill crusher’s motor drives the rotor to rotate at high speed in the crushing chamber. The material is fed into the machine from the upper feeding port and is crushed by the impact, influence, shearing and grinding of the hammer with high speed movement.

In the lower part of the rotor, there is a sieve plate, and the granular grade of the crushed material which is smaller than the size of the sieve is discharged through the sieve plate, while the coarse granular grade which is larger than the size of the sieve is stopped on the sieve plate and continues to be struck and ground by the hammers, and then discharged through the sieve plate.

When the rotor rotates at high speed, the hammer head breaks the material under the action of centrifugal force. The rotor shaft is supported by bearings at both ends, and the bearings are installed on both sides of the box and fixed with bolts. The grate bar is arranged on the grate bar frame with the rotor shaft as the center, and the grate bar frame is fixed by bolts on the box.

The lower part of the box is equipped with a through shaft with two eccentric wheels. Turn the handle on both sides of the machine, make the eccentric wheel turn an angle, then the grate rack can be raised or lowered, so that the gap between the hammer head and the grate can be adjusted, and the required product size can be obtained.

It can be seen that the rotor is the core part of the hammer mill crusher, so when you buy a hammer mill crusher, you must pay attention to the parameters of the rotor, because whether the parameters are reasonably designed affects the efficiency of the crusher.

What are the parts of hammer mill crusher

Hammer crusher parts and hammer crusher accessories
Hammer mill crusher parts and hammer mill crusher accessories

Hammer mill crusher parts are mainly composed of casing, rotor, hammer head, impact liner, screen plate, etc. For more details, please check here:

Hammer mill crusher rotor parameters design and selection

Diameter of the rotor

The diameter of the rotor can be determined by the size of the larger material block. The diameter of the rotor can be calculated according to the following formula: D=(1.2~5)Dmax, where Dmax is the material size of the crusher.

Rotor speed

The rotor speed of the hammer crusher can be designed according to the circumferential speed, which is calculated as follows: n=60ʋ/(πD), where v is the circumferential speed of the rotor (m/s) and D is the diameter of the rotor (m). The circumferential speed of the rotor is generally in the range of 18~70m/s. The circumferential speed of the rotor of a small crusher is between 25~70m/s, so the rotor speed is 750~1500r/min; for a large crusher, the speed is 200~300r/min.

The higher the speed, the smaller the product size, the faster the wear of the hammer head, castor bar and liner plate, and the power consumption also increases Therefore, the circumferential speed of the rotor should be as low as possible.

Design of rotor length

The length of the rotor can be calculated according to the following equation: L=Q/(KDP), where Q is the productivity of the crusher (t/h), D is the diameter of the rotor (m), and P is the density of the material (1.6t/m³).

Calculation of hammer head mass

The correct choice of hammer head mass has a big influence on crushing efficiency and energy consumption. If the hammer head mass is small, the hammer head cannot meet the goal of crushing at once; if the hammer head mass is too large, it will increase the consumption of useless power and the larger centrifugal force will cause wear to other parts. Considering that the hammer head speed is generally allowed to lose 40%~60%, the hammer head mass can be calculated according to the following formula: m=(0.7~1.5)m0, m is the striking mass of the hammer head and m0 is the larger material mass.

How to replace hammer mill crusher parts

Hammer mill crusher parts replacement steps and safety measures.

  1. You must wear a helmet, work clothes and flat-soled non-slip shoes when entering the hammer mill crusher operation site.
  2. Must adhere to the pre-post, pre-work safety confirmation system, strictly prohibited after drinking, physical fatigue personnel on duty.
  3. Before replacing the hammer mill crusher parts must be cut off the power supply, and in the control cabinet hanging “prohibited to close, someone work” warning sign, immediately after the completion of maintenance to retrieve.
  4. Use lighting during the inspection of hammer mill crusher parts, must use the cable without damage to do the line, the lamp head must wear a protective cover.
  5. Ensure that no one is working at the site before the inspection of hammer crusher parts, and must wait for all staff to withdraw.
  6. Use oxygen and welding to strictly comply with the corresponding safety operation procedures.
  7. Clean up the material at the entrance of the hammer mill crusher before the inspection.
  8. Plate the rotor of the hammer mill crusher to a suitable position and fix it.
  9. Cut the hammer head fixing bolt with oxygen and pull out; cut the bumps caused by wear on both sides of the hammer head.
  10. Hold the hammer head to hit the pin, if the pin is bent and cannot be extracted then cut it with oxygen and extract it.
  11. Remove the hammer head, pin, fixing sleeve and bolt to one side, without affecting the construction.
  12. Lift the new hammer head to the entrance of the hammer crusher. If you use a pipe or crowbar or other table hammer head, you must hold the hammer head to prevent it from sliding to one side and injuring people.
  13. Take a pipe from the grate bed to the crusher rotor, two people hold the hammer head and push it to the right position, pay attention to the head of the hammer head facing downward to prevent the hammer head from turning down and injuring people; another person install the fixing sleeve and pin, wear the bolt.
  14. When replacing the hammer head of the hammer crusher, check the weight of the hammer head one by one to ensure the balance of the rotor as much as possible, and check the hammer head on a plate after installation.
  15. After the hammer head is installed, all the bolts will be spot welded and fixed.
  16. Pan the rotor body to observe the clearance between the hammer head and the screen plate, and adjust the screen plate when needed.

What is difference between jaw crusher and hammer crusher

One is the fixed jaw (fixed jaw), which is fixed vertically (or slightly inclined at the upper end) on the front wall of the machine, and the other is the movable jaw (movable jaw), which is inclined and forms a large crushing chamber (working chamber) with the fixed jaw. The movable jaws make periodic reciprocating movements against the fixed jaws, sometimes separating and sometimes approaching. When separated, the material enters the crushing cavity and the finished product is discharged from the lower part; when close, the material loaded between the two jaws is crushed by squeezing, bending and splitting.

jaw crusher and hammer mill crusher
jaw crusher and hammer mill crusher

Hammer crusher belongs to impact crushing, which mainly relies on impact energy to complete the crushing of materials. When the hammer crusher is in operation, the motor drives the rotor to rotate at high speed and the material enters the crusher cavity evenly. The high speed rotating hammer head impacts and shears the material, causing it to be crushed, while the gravity of the material itself causes the material to rush from the high speed rotating hammer head to the baffle plate and screen bar inside the frame.

To understand the main difference between hammer crusher and jaw crusher, you can check this article.

The difference between hammer mill crusher and impact crusher

There are many kinds of mining equipment, some of them belong to different types, but the working principle used is the same, even in the appearance also has some similarities, but in essence there are differences, here is to introduce the differences between hammer mill crusher and impact crusher.

The difference between the structure of hammer mill crusher and impact crusher

The structure of the equipment determines its performance and is the fundamental feature that distinguishes different types of equipment. In the case of hammer mill crusher, in terms of structure, it is mainly composed of the body, transmission device, rotor, etc. The transmission device includes v-belt, wire-wound motor and pulley, and the rotor has a layer of material on the surface of the hammer head, which can avoid excessive wear of the rotor.

And the structure composition of impact crusher is mainly composed of frame, transmission mechanism, impact plate and rotor. The frame is divided into two parts: upper and lower, which are connected by bolts. Inside the machine, the impact plate is suspended inside the crushing cavity, and most of the plate hammers on the rotor are made of monolithic cast steel, which has good wear resistance.

The difference in the scope of application between hammer mill crusher and impact crusher

As we know, impact crusher is a common second crushing equipment, mainly used to deal with coarse, medium and fine materials with side length less than 500mm and compressive strength less than 350 MPa, generally located after the coarse crushing equipment, to achieve the processing of medium and fine crushing materials. The significant advantage of hammer mill crusher is that it can be formed in one time, and there is no need to add jaw crusher and other equipment in the production line, which saves the production cost.

The difference of crushing effect between hammer mill crusher and impact crusher

We know that the hammer mill crusher can be formed at one time, while the impact crusher needs to be equipped with other equipment, such as jaw crusher, for the processing of materials, but the processing effect of both is different. The impact crusher has 2-3 times of impact shaping process, the product particle shape is good, rounded than the hammer crusher, and the crushing is larger, generally 10-25, the high can reach 50. but the impact crusher in the processing of materials, due to the number of strikes, so the powder content is high.

To learn more about the main differences between hammer mill crushers and impact crushers, check out this article:

To learn more about crushers, you can check here: crusher

How to choose hammer mill crusher supplier

Many users in the purchase of hammer crusher, the choice of crusher manufacturers is not very well understood, but only choose the right crusher manufacturers, production to benefit more guaranteed, so in our choice of crusher manufacturers need to pay attention to the following points.

Examine the production strength of the hammer mill crusher manufacturer

Hammer crusher manufacturer’s production strength reflects the size of the crusher manufacturer’s production scale, whether a manufacturer has a professional R & D team, whether the capital is strong, whether the strength to introduce domestic and foreign processing technology, if a crusher manufacturer’s production strength is strong enough to have their own unique technology research and development, the quality of the hammer crusher equipment will be more guaranteed.

Quality of hammer mill crusher equipment

The quality of the hammer crusher equipment produced by the crusher equipment manufacturer will directly determine the production effect of the sand production line, a good hammer crusher equipment is more stable and reliable in operation, high operation rate, high production efficiency, long service life and low failure rate.

Users want to understand the quality of hammer crusher equipment, but also need to crusher manufacturers on site visits, to understand the crusher manufacturers production plant environment, scale, supporting facilities and equipment production process, but also the hammer crusher equipment for trial, in the actual process of detailed observation of the quality of hammer crusher equipment, operating rate and performance and other aspects.

The price of hammer mill crusher manufacturers equipment

Many users in the purchase of hammer mill crusher equipment is the most concerned about a topic is the price of the crusher, we all want to buy good value for money equipment, so you need to choose a cost-effective crusher manufacturers.

First of all, look at the production strength of the manufacturer, as far as possible, choose direct sales operation of the crusher manufacturers, so that equipment costs less input, equipment prices are lower.

Secondly, should communicate with the crusher equipment manufacturer’s product technical manager crusher equipment product supporting details, and then only specifically in accordance with the actual demand to find the corresponding more affordable price.

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