The pendulum grinding mill of Guilin Raytek Mining Machinery Co., Ltd. is widely used in the powder processing of more than 280 kinds of materials in industries such as building materials, chemicals, fertilizers, metallurgy, mining, refractory materials, ceramics, steel, thermal power, and coal. It is suitable for non-flammable and non-explosive materials with a Mohs hardness below Grade 7 and humidity below 6%, such as talc, barite, calcite, limestone, manganese ore, quartz, gypsum, bentonite, potassium feldspar, graphite, alunite, marble, and other minerals.

Mechanical Structure of Guilin Raytek Raymond Grinding Mill

Guilin Raytek Raymond mill mainly consists of the main unit, turbine classifier (birdcage), reducer, high-pressure blower, and pipeline system. Among them, the main unit is composed of the grinding roller assembly (plum-blossom frame, shovel blade, grinding roller, grinding ring), air inlet volute, shovel blade, and main housing. Auxiliary equipment includes jaw crusher, bucket elevator, electromagnetic vibrating feeder, storage hopper, dust collection hopper, electric control cabinet, etc. Users can flexibly configure them according to their specific conditions.

Working Principle of Raymond Grinding Mill

After the jaw crusher crushes large raw materials into the required feed size, the bucket elevator conveys the materials to the storage bin, and then the electromagnetic feeder continuously, evenly, and quantitatively feeds them into the grinding chamber of the main unit. The materials entering the grinding chamber are ground between the grinding rollers and the grinding ring. The ground powder is carried by the negative pressure airflow generated by the blower to the turbine classifier for classification. Through the variable-frequency motor, different rotation speeds can be adjusted to meet different fineness requirements. Fine powder that meets the requirements enters the cyclone collector through the pipeline along with the airflow for separation and collection. Powder that is too coarse falls back into the main unit for regrinding, and is finally discharged through the discharger as the finished product. The motor power is transmitted to the reducer through the pulley, and the output torque of the reducer drives the plum-blossom frame on the central shaft to rotate circumferentially through the coupling. At the same time, the four grinding rollers rotate due to friction with the grinding ring and swing outward under the action of centrifugal force to press tightly against the grinding ring. During the rotation of the central shaft, the shovel blades, which intersect with the grinding roller device at the lower end of the plum-blossom frame, throw the materials between the grinding roller and grinding ring, forming a material cushion layer. Under the rolling action of the grinding rollers, the materials are crushed and ground into powder. The classifier uses a speed-regulating motor and a two-stage reduction system to drive the turbine blades on the turntable to rotate, thereby classifying the powder. By adjusting the rotation speed of the turbine classifier, different fineness levels can be selected. If finer particles are required, the blade speed must be increased so that the contact between the blades and powder increases. Powder that does not meet the requirements is thrown by the blades toward the outer wall and separated from the airflow, while coarse particles fall into the grinding chamber for regrinding due to gravity. Qualified finished powder passes through the blades and is sucked into the large cyclone collector along with the airflow. After the airflow and powder are separated, the powder is collected. The large cyclone collector plays a very important role in the performance of the grinding mill. When the powder-laden airflow enters the collector, it is in a high-speed rotating state. After the airflow and powder are separated, the airflow shrinks along the wall of the cone and moves toward the center until it reaches the bottom of the cone, forming an upward rotating cylindrical airflow. At this point, the powder is collected. Because the core of the upward rotating airflow is under negative pressure, the sealing requirement at the lower end of the collector is very high and must be strictly isolated from outside air. Otherwise, the collected powder will be carried away again by the core airflow, which directly affects the output of the whole machine. Therefore, a powder lock valve is installed at the lower end of the collector. Its function is to isolate the external positive-pressure air from the negative-pressure air inside the collector. This is a very important component. If the powder lock valve is not installed, or if the tongue plate of the valve does not fit and seal tightly, it will cause no powder output or low powder output, thus affecting the capacity of the whole machine.

Some Factors Affecting the Output of Raymond Grinding Mill

• 1. Hardness of the material. The harder the material, the more difficult it is for the Raymond mill to grind it, and the more serious the wear on the equipment. The grinding speed becomes slower, and naturally the grinding capacity becomes smaller.
• 2. Moisture content of the material. When the material contains more moisture, it is easy to adhere inside the Raymond grinding mill and also easy to clog during feeding and conveying, resulting in reduced grinding capacity.
• 3. Fineness requirement of the finished powder. The higher the fineness requirement, that is, the finer the material is required to be after grinding, the smaller the grinding capacity of the Raymond mill.
• 4. Composition of the material. The more fine powder contained in the material before grinding, the more it affects the grinding process, because these fine powders are likely to adhere and affect conveying. For materials with a high content of fine powder, they should be screened once in advance.

Operating Process of Raymond Grinding Mill

Before starting the Raymond mill, check whether all inspection doors are tightly closed, check whether the jaw plate gap of the crusher meets the feed size requirements, and adjust the rotation speed of the classifier to approximately meet the required finished product particle size. Finally, start the machine in the prescribed sequence.

• 1. Start the bucket elevator;
• 2. Start the jaw crusher;
• 3. After there is material stored in the hopper, start the classifier;
• 4. Start the blower (start with no load, and load it after normal operation is achieved);
• 5. Start the Raymond mill main unit, and at the moment of starting the main unit, immediately start the electromagnetic vibrating feeder. At this point, the grinding operation of the Raymond mill begins.

The startup sequence of the Raymond grinding mill is: Bucket elevator → Crusher → Classifier → Blower → Main unit → Feeder When shutting down the Raymond mill, the machines should be stopped in the following order:

• 1. First shut down the feeder and stop feeding;
• 2. About one minute later, stop the main unit, allowing the remaining material to be basically ground completely;
• 3. Stop the blower;
• 4. Finally stop the classifier.

The shutdown sequence of the Raymond grinding mill is: Feeder → Main unit → Blower → Classifier Note: After the bucket elevator has conveyed a certain amount of material to the storage bin, first stop the crusher and then stop the elevator. This should be adjusted according to the real-time change in storage volume. During normal operation, oil must not be added casually to the Raymond mill, so as to ensure production safety. If any abnormal noise occurs in any part of the grinding mill, or if the load suddenly increases, the machine should be stopped immediately for inspection and troubleshooting to avoid major accidents. Before restarting, the remaining material inside the mill must be removed; otherwise, the starting current will be too high, affecting startup.

This article was published on May 22, 2026, and last updated on May 29, 2026. The article will be continuously updated.