Wood Hammer Mill : The Comprehensive Guide

Hammer mill is a common equipment in wood processing factory and wood pellet plant. It serves to crush wood materials into powders so that they can be used to make wood pellet fuel and other wood products. Hammer Mill is an enhanced version of the wood shredder. Because it can process the raw materials very delicately. More importantly, it can handle a wide range of raw materials. Such as pines, poplar, cedar, bamboo, weed tree, and various fiber materials like rice straw, cotton stalk, twitch grass, etc. Hammer mill applies to materials whose diameter is 10-30mm, and reduce their size to 3-5mm.

• Base: serve to connect and support all parts of the hammer mill. The crushed materials are discharged under the base.
• Rotor: composed of the main shaft, hammer frame plate, hinge pin and bearings. It is the working part of the hammer mill. The rotating speed is high. The rottor need dynamic balance experiment before the hinge pin and hammer plate are installed.
• Operation door: you need open the operation door when replacing the screener or hammers. The operation door has wheels at the bottom that allows you to push is aside during maintenance. The screener is fastened with a special hold-down mechanism. During the running of the hammer mill, the operation door is locked by a single-acting cylinder to ensure it can’t open.
• Upper cover: It has the feed hopper at the top and the base at the bottom. The screeners are installed on the inner sides of the upper cover. They form the pulverizing chamber with the rotor. This is where the raw materials are crushed.
• Feed guide device: let the raw materials get into the crushing chamber from the left or right side. The rotating direction of the motor and the guide plate should be the same. The feed plate is controlled by a DQK air cylinder, and the rotating direction of the motor is controlled by a travel switch.

First, you feed the wood materials into the feed hopper and they will fall into the pulverizing room. In the pulverizing room, the wood materials are beaten by the high-speed rotating hammer and bounce to the toothed plates, then they bounce back and repeat this process. Meanwhile, the materials are grinded between the hammers and screener. Under the beating, collision and friction of the hammers, toothed plates and screener, the wood materials are crushed into small particles until they are small enough to get through the screener.

Then, the crushed wood materials are pumped out through the screener by the blower. There is a wood powder collector (a aggregate cylinder or a dust bag)that separate the air from the final products. If the hammer mill isn’t equipped with a wind blower, the crushed materials will be expelled out by the airflow in the pulverizing room.

Commercial hammer mills are more widely used than ordinary wood crushers, with higher output and more types of finished products. The raw materials it can handle can be divided into the following categories.

• Wood materials: logs, wood chips, wood board, branches, bamboo, poplar, fruit trees, etc.
• Grains: corn, wheat, sorghum, buckwheat, soybean, etc.
• Charcoal: raw charcoal, bamboo charcoal, fruit charcoal, coconut shell charcoal, etc.
• Fibers: rice straw, straw, wheat straw, cotton and hemp straw, etc.
• Others: cardboard boxes, coconut shells, Chinese herbal medicines, forages, etc.

1. Charcoal production line
   Hammer mills are widely used in charcoal production lines. Provide raw materials for the production of biomass briquette. It can also directly crush charcoal to produce charcoal briquette.
2. Animal Feed
   It hammers forage and grain into powder. So customers can use these materials as feed.
3. Nutrients
   Sawdust is used as soil fertilizer to increase soil fertility. What’s more, it can also be used as a medium to grow fungi.
4. Papermaking
   After the wood shredder shreds the paper, it can be reused for papermaking.

1. Reputation & Experience of Manufacturer

Start by examining the manufacturer’s reputation and track record. Ask for feedback and reviews from past clients. Examine the duration of the company’s operation. It is advisable to choose a well-established and reputable manufacturer to make a reliable choice.

2. Examine Quality

Next, you need to check the quality of wood products like wood crusher, wood chip & hammer mill. Inquire about the types of wood available and their expertise in choosing the right one for your needs. Good wood means durability, and picking the right kind boosts your product’s lifespan & helps you achieve your goal.

3. Customization Options

Sometimes, depending on the nature of products, you may require customization. Therefore, before making a final choice, it’s essential to know whether potential wood chip & hammer mill manufacturer provide any customization option. You can ask your queries to know the details.

4. Budget

Besides quality, your budget is an essential consideration. Get quotes from different manufacturers and compare prices, including any setup, tooling, or engineering fees on top of the piece price. Check if delivery costs are included or added separately. Also, don’t forget to ask about delivery times. If timing is tight, ensure they can meet your schedule. Check their logistics network for reliability.

5. Customer Support & Communication

Last on our list is to check whether they provide customer support or not. It is recommended to pick a manufacturer who responds to your queries timely and provides assistance whenever required. Therefore, before collaborating with any wood crusher manufacturer, evaluate how long they take to respond.

A properly built hammer mill is designed for heavy use, but even the toughest machines need regular care to stay efficient and avoid unexpected downtime. A solid maintenance plan doesn’t just protect your investment—it keeps production moving without surprises.

1. Inspect Hammers and Screens Regularly
Hammers, pins, spacers, and screens are all wear parts. Check them weekly, or more often if you’re running abrasive materials. Replace worn or broken hammers immediately to maintain consistent grinding and protect the rotor.

Look for hammer rounding or edge wear.

Inspect pins for wear from hammers

It is best practice to replace the pins and spacers at the same time as hammers, but some operations choose to replace this periodically as needed.Inspect screens for cracks, holes, or clogged openings.

2. Monitor Rotor Balance
Even slight imbalances in the rotor can cause vibration, reduce grinding efficiency, and stress other components. If you notice increased vibration or noise, stop and check hammer wear and rotor alignment.

3. Keep Bearings Lubricated
Bearing failure is one of the leading causes of unplanned downtime. Follow manufacturer lubrication schedules closely and use the right grade of grease or oil recommended for your mill’s operating conditions.

4. Clean the Grinding Chamber
Build-up inside the chamber reduces grinding efficiency and can cause overheating. A quick visual inspection after every shift and a thorough cleanout at scheduled intervals keeps material flow smooth.

5. Set a Preventative Maintenance Calendar
Waiting for a breakdown before doing maintenance costs more every time. Create a basic schedule for:

Daily visual checks

Weekly inspections

Monthly deep maintenance

Annual rebuilds or component replacements if needed

A few minutes spent checking wear parts and bearings saves hours—or even days—of downtime later.