Knife Crusher Operation Manual

Time:2023-03-16 15:27:30 Author:Suny Group

The knife crusher is a circuit board crusher, which is most suitable for crushing various brittle materials. The maximum compressive strength of the crushed material is not more than 40Mpa, and the crushing of the material whose surface moisture is not more than 10%.

Basic parameters

Minimum discharge particle size: 2mm

Transmission type: belt drive

Power: 75kW

Crushing spindle speed: 2000r/min

Number of crushing heads: 8 moving knives, 4 fixed knives

Structure and principle

Knife crusher structure diagram

Knife crusher structure diagram

The knife crusher is composed of main parts such as rotor, machine body and adjustment mechanism. The motor drives the rotor through belt transmission.

The rotor part is composed of the main shaft, the cutter head, the blade, and other main parts. The blade is installed on the cutter head, and the cutter head is fixed on the main shaft.

The body part is composed of upper and lower casings, screens, pallets and other main parts. The screen is installed on the pallet. One end of the supporting plate is suspended on the lower casing with a shaft, and the other end is connected with the adjustment mechanism through the connecting plate. The fixed knife is installed on the inner wall on both sides of the casing, and is combined with the moving knife to chop materials. The screen, moving knife and fixed knife form a crushing chamber.

A knife crusher is a rotor-type crusher with a knife head. After the material enters the crushing chamber, it is firstly cut and crushed by the cutter head rotating with the rotor at high speed, and the crushed material is discharged through the sieve hole.

The adjustment of the discharge particle size is realized by replacing the screens of different specifications.

Installation and test run

Cans Knife Crusher Crushing

Cans Knife Crusher Crushing

1. Technical requirements for installation:

⑴The horizontality tolerance of the main shaft of the crusher is ≤0.2mm/m;

⑵Level tolerance in the vertical direction of the main shaft of the crusher ≤ 1mm/m;

(3) The concentricity tolerance between the main shaft of the crusher and the main shaft of the motor is ø0.1 mm

2. Installation

The installation of the crusher should be carried out after the reinforced concrete foundation is dry. The installation method is as follows:

(1) When installing, first check whether the positions of the reserved holes on the foundation and the installation height are consistent with the installation layout drawing, then hoist the crusher and the motor on the foundation respectively, align them with the pre-drawn center line on the foundation, and place them on the base Use the wedge block to initially adjust to meet the technical requirements of the installation, and lock the anchor nuts

(2) After all the installation is completed, turn the flywheel by hand, and the main shaft must rotate flexibly, lightly and freely. If it is stuck, it must be readjusted until the requirements are met.

3. Test drive

After the crusher is installed, a 20-minute no-load test run and a 20-minute load test run should be carried out. After a test run, the test run can only be done after ensuring that there is no jamming phenomenon.

⑴No-load test run

The no-load test run is carried out without feeding, and the following requirements should be met:

①Start and stop according to the startup procedure, and the electrical interlock system should meet the design requirements;

② All fasteners should be firm and reliable without loosening;

③Flywheel rotation balance;

④ The maximum temperature of the bearing does not exceed 75°C;

⑤ Bearing lubrication is normal, no oil leakage;

⑵Load test run

The load test run should be carried out after the no-load test run is qualified. In addition to meeting the requirements of the no-load test run, the following requirements must also be met:

① There should be no significant vibration and abnormal noise;

②The feeding position is correct and the discharge is normal.

Operating procedures

Knife crusher

Knife crusher

1. Preparations before start-up

① Check whether there is an appropriate amount of lubricating oil in the bearing seat.

② Check the gap between the rotor and the screen, especially after replacing the new blade;

③ Check whether there are materials and other foreign objects in the crushing cavity.

④ Check whether the nuts of the casing are firm and reliable.

⑤Barring 2-3 turns to ensure that there is no jamming.

2. Start

First send the start signal, and then start the motor.

3. Operation

① After the crusher runs for 1-2 minutes without load, if the operation is normal, the material can be fed, and the material should be continuously and evenly flowed into the crushing cavity from the width of the feeding port.

② It is strictly forbidden to have superhard objects and other unbreakable materials entering the machine, so as not to damage the equipment and cause accidents.

③ When the crusher is working, the staff cannot stand within the action line of the rotor inertial force, and any cleaning, adjustment, inspection, etc. are strictly prohibited to avoid danger.

④The maximum temperature of the bearing should not exceed 75°C. If it exceeds 75°C, stop the machine immediately, find out the reason, and handle it properly.

4. Parking

The parking sequence is as follows:

① After stopping feeding, let the crusher continue to run until the materials in the crushing chamber are processed.

②Stop the crusher

③ Stop the discharge conveyor.

Maintenance and maintenance

1. Regularly check whether the fasteners are reliable.

2. Every time the crusher works for 60 hours, check the lubrication of each bearing, and make up the grease (No. 1 calcium sodium base grease) once.

3. Check the wear degree of the blade once a week. Use a sharpener to sharpen the blade. When the blade is severely worn, it should be replaced as a whole set or in pairs at relative positions.

4. In the first week of operation, check the tension of the belt every day, and then check it twice a week, and adjust it in time if it does not meet the requirements.

5. Blade replacement

When replacing the blade, first open the upper box, then turn the flywheel by hand, place the blade in the inlet space, remove the screw with a wrench, and then take out the blade for replacement.

6. Screen replacement

When replacing the screen, first open the movable cover, and then take out the screen for replacement.

The lubricating oil in the bearing seat should be replaced every 3-6 months, and the amount of oil added should be two-thirds of the inner space of the bearing seat.

7. Regularly check the insulation of the electrical system and the connection of the terminal. The explosion-proof surface is required to be clean; the cable must be replaced when it is damaged; the terminal must be re-tightened when it is loose.


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