The use of hammer type mill feat Analysis

A crushing effect of the main factors affecting

Hammer mill process effect, with the degree of crushing, grinding process of production and energy consumption, etc. 3 indicators assessed. These targets depend on the physical

properties of the crushed material and physical structure, shape and size of the sieve, hammer circle around speed hammer and screen surface between

Clearance and so on.

1.1 smash the structure and physical properties of materials

Different feed different physical properties of the original powder, crushing their different degrees of difficulty. Crushed seeds with a large cortex and the original powder

structure more closely than crushed seeds with loose skin less difficult and more. Excessive moisture content of raw materials, increase the toughness of the material will

Lead hammer mill consumption increased and yield. Meanwhile, the high moisture content of the raw material, but also easy to plug the sieve, resulting in reduced yields.

1.2 sieve

Improve the ability to sieve through the outside in addition to increasing the effective area of ​​the sieve, sieve and other scales may also be used. In order to improve the

sieve through the ability to increase production.

1.3 hammer tip speed

Tip speed hammer mill affect the performance of the important factors. Grinding the material with the degree of productivity of the mill hammer tip speed increases the increase.

Series of hammer mill design products, its hammer tip line speed of 8090 m / s, in order to adapt to corn, wheat-based material crusher machine. Hammer at the end of line speed is

generally determined by orthogonal experiment.

1.4 Hammer ends with the gap between the sieve

Hammer and sieve mill is the gap between the performance of the important parameters. Mill operation, the grinding chamber sieve circle forming materials combined with a

circulation air layer to a certain speed with the rotor rotation. Close to the screen surface material movement is slow, the inner faster. Ring

Stratosphere is often mixed with coarse particles, showing stratification.

1.5 Flow

Hammer mill for crushing effect of flow has an important impact. Its total energy consumption increases with the flow becomes larger. However, increases in a certain range, the

production growth faster than the increase in energy consumption, low energy consumption time t material. Therefore, to achieve t material under conditions of minimum energy

Should stabilize hammer mill traffic.

1.6 mill of suction

Hammer mill using suction method can reduce the temperature of the material, to prevent the sieve clogging their productivity than not suction discharge increased by 10% when

25%.

2 Installation

2.1 Installation Requirements

Hammer mill should be installed in the basement or ground floor upstairs, lay the foundation of stone or concrete. Medium and large mill should be installed with matching

dampers to reduce vibration and noise.

Using more than 15 kW motor, should buck starter to reduce the starting current, should be fitted with the same capacity supporting ammeter, voltmeter, power meter and switches

and other instruments.

2.2 Safety checks

After installation grinder safety checks should be carried out to determine the no problem to run.

Check the integrity and fastening parts, especially high-speed hammer and other parts must be firmly fixed; checking mill in the machine base is solid; checks bearing

lubrication condition; grinding chamber door open, check whether the debris crushing chamber .

The inspection is completed, everything is normal, you can empty running 1520 minutes, the observation is installed correctly or not.

After idling should stop checks, as part of the technical state of the normal, before re-starting, to be normal speed before the load operation.

3 operation precautions

3.1 must be carefully checked before driving the fasteners, without loosening. Coupling or drive belt installation meets requirements. Power lines should be good, the motor

should be grounded. Materials shall not be mixed with iron, gravel and other debris.

3.2 Turn the rotor by hand to check its rotation is flexible, there should be no collision and friction sound card.

3.3 sieve be installed securely sealed and not leak material, sieve frame to tighten.

3.4 work process, such as abnormal noise, the material clogging, bearings or motor overheating (temperature over 40), you should stop feeding, stop checks, troubleshooting.

3.5 end of the work should be idling 23 minutes, the material inside the machine is completely discharged only after stopping grinder and fan.

3.6 operations must strictly ensure safety in production. Operator should be familiar with the machine's performance and structure, have the person responsible. Troubleshooting,

adjustment and cleaning machine should cut off the power, parking. Non-random improved mill speed. Should always check the cotter pin on such

Excessive wear or fracture spalling, should be replaced immediately.

4 hammer mill adjustment and maintenance

4.1 sharp corners with a blunt hammer after the reverse angle adjustment can be used (reversing mill can change the direction of rotation can use another sharp corners). If the

hammer end of the corners are worn, they should turn around and use. In turn or angle adjustment, should all of the hammer simultaneously to

To maintain balance of the rotor. Corners worn, the hammer should be all the new ones, which are arranged according to the instructions of the way, each hammer poor quality

should not exceed 5 grams.

Some wear hammer mill in late due to wear unevenly, prompting grinder loss of balance, increased vibration. You should correct rotor static balance, regroup or replace hammer

hammer.

4.2 sieve worn or damaged should be replaced. Installation screen films, sieve with a burr side should where smooth outward, sieve and sieve frame to fit tightly. Ring sieve

tablets in installation, which should overlap the inner layer of stubble along the direction of rotation to prevent the feed in the lap stuck.

4.3 After the end of the work shift, the machine should be cleaned inside and outside, remove dust and dirt in order to avoid rusting machinery, sieve clogging dust dirt

entering the bearing.

4.4 Periodic inspection, cleaning and lubricating bearings.

4.5 found machine parts have serious wear and damage should be repaired promptly replaced, repaired rotor should be balanced.

5 Common Faults and exclusion method

Symptom Cause Remedy difficult to start a motor. Voltage is too low 1. Escape peak then start 2. Conductor cross-sectional area is too small 2. Changing the appropriate wire 3.

Starting compensator is too small 3. Put startup compensation unit 4. fuse easily blown 4. conversion and motor capacity in line fuse

Motor weakness overheating 1 running a two-phase motor. Turned off phase, three-phase operation 2. Motor windings shorted 2. Overhaul the motor 3 long-term overload 3. Rated

load is a strong vibration mill work. Hammer mounted arranged mistaken one. hammer arranged by reinstalling 2. corresponding groups of poor quality hammer is too large 2.

Re-exchange the hammer, so that each group of poor quality is not more than 5 g 3. Individual hammer stuck without bypassing 3. Makes hammer rotating flexible four. Rotor

unbalance four other components. Balanced rotor 5. Shaft bending 5. School Straighten or replace a new shaft 6. bearing damage 6. Updated bearing grinder 1 stone and other hard

objects into the machine

Within one. Downtime clear hard objects abnormal noise 2. Machine parts missing or damaged 2. Shutdown inspection, replacement parts 3. Hammer sieve gap is too small 3. The gap

compliance sizes productivity decreased significantly 1. Motor power less than 1. Overhaul motor 2. hammer severe wear 2. turn around to use or replace hammer 3.

Original powder feeding uneven 3. Uniform feed 4 raw water is too high 4. Drying raw material inlet anti-spray. Transport pipe 1 pipe blockage 2 sieve clogged 2. Cleaning or

replacement mesh sieve too coarse a finished product. sieve badly worn or have holes in one. fill holes or replace sieve 2. sieve and sieve frame stickers

Co-lax, or side gap is too large 2. Downtime, so sieve and sieve frame fit tightly.

Bearing overheating a spindle motor hub with a different heart. Adjust the motor shaft concentric with the center to make it 2 grease too much, too little or poor 2 for grease,

required filling 3. Bearing damage 3. Renewal bearings 4 spindle is bent or rotor imbalance 4. correction spindle balancing rotors 5 long-term

Overworked 5. Reduce the feed rate