As a reputable supplier of Twin Shaft Concrete Mixers, I understand the importance of proper lubrication in ensuring the efficient and long - lasting operation of these machines. In this blog post, I will delve into the types of lubrication that a twin shaft concrete mixer needs, providing you with in - depth knowledge to optimize your mixer's performance.
Understanding the Working Mechanism of Twin Shaft Concrete Mixers
Before discussing lubrication, it's essential to understand how twin shaft concrete mixers work. Twin shaft concrete mixers, such as the JS Twin - shaft Concrete Mixer, Twin Shaft Mixer, and Twin Spiral Concrete Mixer, consist of two parallel shafts equipped with mixing blades. These shafts rotate in opposite directions, creating a powerful shearing and mixing action that ensures thorough blending of concrete ingredients.
The continuous rotation of the shafts and the interaction between the mixing blades and the concrete place significant stress on the moving parts of the mixer. This is where lubrication plays a crucial role.
Types of Lubrication Required for Twin Shaft Concrete Mixers
1. Gearbox Lubrication
The gearbox is one of the most critical components in a twin shaft concrete mixer. It is responsible for transmitting power from the motor to the shafts at the appropriate speed and torque. High - quality gear oil is required to lubricate the gears inside the gearbox.
Characteristics of Suitable Gear Oil
- Viscosity: The viscosity of the gear oil should be carefully selected based on the operating conditions of the mixer. In general, a medium - to high - viscosity gear oil is preferred for twin shaft concrete mixers. This is because the gears in the gearbox are subject to high loads and pressures. A higher viscosity oil forms a thicker lubricating film between the gear teeth, reducing friction and wear. For example, in a mixer operating in a relatively warm environment, an ISO VG 220 or ISO VG 320 gear oil might be suitable.
- Extreme Pressure (EP) Additives: Gear oil with EP additives is essential. These additives react with the metal surfaces under high - pressure conditions, forming a protective layer that prevents direct metal - to - metal contact. This is particularly important in the gearbox of a twin shaft concrete mixer, where the gears are constantly under heavy loads. EP additives help to prevent pitting, scoring, and premature wear of the gears.
2. Bearing Lubrication
Bearings support the shafts in the twin shaft concrete mixer, allowing them to rotate smoothly. There are two main types of bearings used in these mixers: roller bearings and ball bearings.
Grease for Bearings
- High - Temperature Resistance: Bearings in a twin shaft concrete mixer can generate a significant amount of heat due to the continuous rotation of the shafts. Therefore, a high - temperature grease is required. Greases with a dropping point of at least 200°C are often recommended. For instance, lithium - complex greases are commonly used as they offer good high - temperature performance and mechanical stability.
- Water Resistance: Concrete mixing involves the use of water, and there is a risk of water ingress into the bearing housing. A water - resistant grease helps to prevent corrosion and rusting of the bearing components. Some greases are formulated with additives that repel water, ensuring that the bearings remain well - lubricated even in a wet environment.
3. Shaft Sealing and Lubrication
The shafts of a twin shaft concrete mixer need to be properly sealed to prevent the leakage of concrete and to keep contaminants out. At the same time, the seals need to be lubricated to ensure smooth movement and prevent premature wear.
Seal Lubricants
- Silicone - Based Lubricants: Silicone - based lubricants are often used for sealing applications in twin shaft concrete mixers. They offer excellent lubrication properties and are compatible with most seal materials. Silicone lubricants also provide good resistance to water, chemicals, and high temperatures. This helps to maintain the integrity of the seals and prevent concrete leakage, which can lead to damage to the mixer and environmental issues.
Benefits of Proper Lubrication
1. Extended Equipment Life
Proper lubrication reduces friction and wear on the moving parts of the twin shaft concrete mixer. By forming a protective film between the contacting surfaces, lubricants prevent direct metal - to - metal contact, which can cause premature wear and failure. This means that the gears, bearings, and other moving parts of the mixer will last longer, reducing the need for frequent replacements and maintenance.
2. Improved Efficiency
When the moving parts of the mixer are well - lubricated, there is less resistance to motion. This results in lower energy consumption as the motor does not have to work as hard to drive the shafts. Improved efficiency also means faster mixing times, allowing you to produce more concrete in less time.
3. Reduced Downtime
Lubrication helps to prevent breakdowns and malfunctions in the mixer. A well - lubricated gearbox is less likely to experience gear failure, and properly lubricated bearings are less prone to seizing. This reduces the amount of downtime required for repairs, ensuring that your concrete production operations can run smoothly.
Lubrication Maintenance Schedule
To ensure the effectiveness of lubrication, a regular maintenance schedule should be established.
- Gearbox Oil Change: The gear oil in the gearbox should be changed at regular intervals. This interval can vary depending on the manufacturer's recommendations and the operating conditions of the mixer. In general, it is recommended to change the gear oil every 1000 - 2000 operating hours. Before changing the oil, the gearbox should be drained completely, and the filter (if present) should be replaced.
- Bearing Grease Replacement: Bearings should be relubricated at specific intervals. This can be determined by monitoring the operating temperature and the condition of the bearings. In some cases, it might be necessary to relubricate the bearings every 200 - 300 operating hours. When relubricating, the old grease should be purged from the bearing housing, and fresh grease should be added in the correct amount.
Conclusion
Proper lubrication is essential for the optimal performance and longevity of twin shaft concrete mixers. By using the right type of lubricants for the gearbox, bearings, and seals, and by following a regular lubrication maintenance schedule, you can ensure that your mixer operates efficiently and reliably.
If you are in the market for a high - quality twin shaft concrete mixer or need more information about lubrication and maintenance, I invite you to get in touch with us. Our team of experts is ready to assist you in selecting the right mixer for your needs and providing guidance on lubrication and maintenance best practices.
References
- "Handbook of Lubrication and Tribology, Volume II: Application and Maintenance" by B. Bhushan.
- Manufacturer's manuals for twin shaft concrete mixers.