The cement raw material grindability test ball mill is a laboratory ball milling device designed according to the Bond method, used to determine the grindability (grindability or Bond work index) of cement raw materials.

Cement Raw Material Grindability Testing Ball Mill

Model:SN2025-CE001

I. Product Introduction:

The SN2025-CE001 Cement Raw Material Grindability Testing Ball Mill, developed by Hebei Tianqixingzi Inspection Equipment Co.,Ltd., is designed according to GB/T 26567 "Test Method for Grindability of Cement Raw Materials (Bond Method)". It is specifically designed for cement plant laboratories to determine the grindability of cement raw materials and can also be used for grinding other materials.

This equipment features a compact structure, convenient operation, simple maintenance, reliable performance, good dustproof and sound insulation properties, and automatic control via a timer.

II. Main Technical Parameters

1. Grinding cylinder inner diameter and dimensions: Φ305×305mm

2. Grinding cylinder speed: 70r/min

3. Grinding media loading capacity: 1000L

4. Grinding media gradation and quantity: (Sold separately by the user)

5. Single material loading capacity: 1L

6. Material particle size entering the mill: <7mm

7. Grinding time: 0~30min

8. 9. Motor power: 1.5kW

10. Power supply voltage: 380V

11. Power supply frequency: 50Hz

III. Structural Overview This experimental mill consists of four main parts: the casing, the mill itself, the support, and the electrical control box.

1. Casing: The casing is composed of two layers of fiberglass plates with sound-absorbing cotton sandwiched in between. It consists of upper and lower covers. The upper cover has a door (2), and the lower cover has a hopper (3) for holding the ground material. The casing and the mill shaft are sealed with end caps (7) fitted with felt rings, thus providing good sound insulation and dustproofing.

2. Mill: The mill consists of a cylinder (5), a mill door cover (4), bearings and bearings (8), a coupling (10), and a gear reducer (11). It is the main part for grinding materials. During unloading, the mill cover is replaced with a grid-hole unloading plate to meet the unloading requirements.

3. Support: The support is a steel structure composed of the mill (9) and the motor (12), used to support the casing, mill, electric reducer, and electrical control box, etc. There are four Φ20 foot bolt holes at the bottom of the mill base for fixing the entire set of equipment. 

4. Electrical Control Box : Composed of buttons, combination switches, thermal relays, time relays, combination switches, etc. The grinding time is set to 30 minutes at the factory, and users can adjust it freely according to the fineness of the material grinding. The mill door can only be opened after the mill has stopped. If the mill door is not aligned with the casing door, use a jog switch to align it.

IV. Installation and Trial Run

1. After unpacking the test mill, wipe the entire machine clean. Carefully check whether the gear reducer motor, mill, casing, bearing seats, etc., have been damaged during transportation, and whether the fasteners are loose. Tighten them if necessary. Then, during hoisting, the ropes should be tied to the base, not to the casing, shaft, or motor, to avoid damaging parts.

2. During installation, first clean oil and dirt from the base plate of the support. The cement foundation surface should be flat. After the support is placed stably, tighten it with anchor bolts (steel shims are permissible for leveling).

3. Before trial operation, check the mill and casing. If there is any contact, adjust it to prevent collision. Check that the mill door cover is tightly closed and not loose. Check the lubrication of the bearing housing and geared motor. If there is no lubricating oil, add oil to the level indicated in the oil window.

4. Manually rotate the mill more than one revolution to check for any collisions, stiffness, or other abnormal conditions.

5. Power on and test the mill. The mill should rotate clockwise (viewed from left to right from the front of the test mill). After starting, if the rotation direction is not as required, disconnect the power supply. After the motor stops rotating, swap the positions of any two power leads and restart. The test mill should function well under no-load conditions before gradually adding load.

V. Operating Procedures

1. Weigh the raw material, gypsum, or other material to be ground.

2. Crush the material before feeding it into the mill to ensure the particle size is less than 7mm.

3. Clean the mill body of any remaining material, then pour in the crushed material.

4. Tighten the mill door and secure the clamping nut, ensuring the door is not misaligned and leaks. Then close the casing door.

5. Adjust the grinding time according to the grinding requirements. Do not adjust while the mill is running.

6. Start grinding.

7. If sampling is required during the grinding process to test the fineness or specific surface area of the material, the mill door should be opened for sampling 2-3 minutes after the machine has stopped and the powder has settled. If the mill door is not aligned with the casing door, it can be adjusted using a jog switch.

8. When the specified grinding time is reached, the mill should automatically stop. After stopping, replace the perforated plate and restart the mill to discharge the material until it is completely discharged.

9. After waiting for about 5 minutes, the hopper can be removed to collect the ground material.

10. If grinding materials with special requirements, dry slag or sand should be placed inside the mill cylinder and ground for 5 minutes before grinding to clean the material adhering to the steel balls.

VI. Maintenance

1. Regularly clean the dust from the outer surface of the mill and the inner surface of the casing.

2. Regularly check all fasteners; if any are loose, tighten them promptly.

3. 4. Regularly inspect the lubrication system. Change the reducer lubricating oil (No. 40 machine oil) every three months and the bearing lubricating grease (calcium-based or calcium-sodium-based grease) every six months.

5. During operation, frequently check for abnormal noises, impact sounds, excessive temperature rise of the gear reducer motor and bearings, smoke, or foul odors. If any are found, immediately disconnect the power supply, find the cause, and troubleshoot before resuming operation.

6. Regularly inspect all gaskets and the sealing rings on the mill door cover 4. Replace any damaged gaskets promptly.

7. Keep the control box dry and regularly check the power supply contact; ensure the grounding is reliable.