一.Double Roll Crusher Overview
Double roller crusher, also known as roller crusher, roller crusher, its working principle is through the two round rollers reverse rotation, the ore from the two rollers between the entry. Due to friction, the ore is brought into the crushing space between the two rollers and crushed by extrusion. The crushed product is discharged from the gap between the two rollers under its own weight. The minimum distance between the two rolls determines the maximum particle size of the crushed product.
Double roll crusher is widely used in cement, chemical industry, electric power, mining, building materials and other fields. In the cement industry, it can be used to crush limestone and other raw materials; in the chemical industry, it can process various ores to meet the production demand; in the electric power industry, it has a remarkable effect on the crushing of coal, which can simplify the coal selecting process, and reduce the investment of equipment and labour cost. For example, double roll crusher has unique advantages for raw coal crushing, in the process of coal crushing, as long as the removal of iron and impurities, coal can be crushed directly without removing the harangue, the crushed coal particle size is uniform, with less needles, which has good economic and industrial value. At the same time, the double roll crusher is equipped with double motors, adequate energy supply and high efficiency, which is also one of the reasons why it is widely noticed in the market.
二.The selection guide of double roll crusher
1.Consider the nature of the material
Different materials have different characteristics such as hardness, humidity and viscosity, which have an important influence on the selection of double roll crusher. For example, for materials with high hardness, such as iron ore, quartz, etc., it is necessary to choose a double-roll crusher with stronger crushing capacity, and its roll surface material should be more wear-resistant to ensure the service life of the equipment. For materials with high humidity, such as coal, it is necessary to consider the anti-clogging performance of the equipment, and choose the crusher with appropriate roll spacing and discharge mode to avoid material clogging in the crushing process. For materials with high viscosity, such as clay, special crushing structure or auxiliary equipment may be required to ensure the crushing effect.
2.Determine the processing capacity and discharge size
Processing capacity refers to the amount of material that can be processed by the crusher per hour, usually in tonnes per hour. When choosing a double-roll crusher, it is necessary to determine the appropriate processing capacity according to the actual production requirements. If the processing capacity is too small, it will affect the production efficiency; if the processing capacity is too large, it will cause equipment waste and cost increase. Discharge particle size refers to the size of the crushed material particles, which is generally determined according to different industry needs and subsequent process requirements. For example, in the construction material industry, for the crushing of limestone, a smaller discharge particle size may be required to meet the requirements of concrete production. Usually, the discharge size can be controlled by adjusting the roll spacing and rotational speed of the double-roll crusher.
3.Focus on equipment reliability and ease of maintenance
Equipment reliability is crucial to production efficiency and equipment life. A reliable double-roll crusher can operate stably, reduce downtime and improve productivity. At the same time, reliable equipment can also reduce maintenance costs and extend equipment life. Ease of maintenance is also an important factor to consider when selecting a model. Equipment with convenient maintenance can reduce maintenance time and manpower costs, and improve the availability of the equipment. For example, some double roll crushers adopt modular design, which is easy to replace the wearing parts; there are also some equipment equipped with automatic lubrication system, which reduces the workload of manual maintenance.
4.Weighing price and after-sale service
Price is an important consideration when selecting a model. The price of the double roll crusher is affected by a variety of factors, such as the model, specification, material and structure of the equipment. Different models, specifications, materials and structures of double roll crusher have different prices, so you need to evaluate the price according to the specific equipment. At the same time, after-sales service also plays an important role in guaranteeing the normal operation of the equipment. Choose a manufacturer with perfect after-sales service system and timely response, you can get timely maintenance and technical support when the equipment failure, to ensure the normal operation of the equipment. For example, some manufacturers provide comprehensive after-sales service such as equipment installation, commissioning, training and maintenance, which solves the user’s worries.
三.The daily maintenance of double roll crusher
1.Preparation before starting the machine
Before starting the double roller crusher, a series of preparations must be carried out. First of all, the fasteners should be carefully checked whether they are firm and tight to ensure that the equipment will not loosen during operation. According to statistics, about 30% of equipment failures are caused by loose fasteners, so this step is crucial.
Next, rotate each oil cup cover and fill with the appropriate amount of grease. The main oiling points of the machine include the rotating bearings, roll bearings, all gears, as well as the movable bearings and sliding surfaces. Good lubrication has a great deal to do with bearing life, and it directly affects the service life and operating rate of the machine. For example, if lubrication is poor, the wear rate of the bearings may increase by up to 50 per cent, which can significantly shorten the life of the machine.
Then, check whether the drive belt is good and replace it promptly if it is broken. When there is oil on the belt or pulley, it should be wiped clean to ensure the normal operation of the transmission system. At the same time, check whether the contact between the sprocket and chain is good, and the deflection of the chain should be suitable, with deflection f = 0.02A (A is the centre distance of the sprocket).
2.Maintenance points in use
Feed only after the machine is in normal operation, so as to avoid material blockage and equipment damage caused by the equipment not being fully started. If there is any jamming and stoppage phenomenon when using the machine, the power must be cut off immediately and the material must be cleared. Do not clean it without cutting off the power supply to avoid danger.
The machine should be kept clean and the dust foam should be cleaned up in time after each use. Dust not only affects the normal operation of the equipment, but also may cause harm to the health of the operator. According to relevant data, the probability of workers exposed to dust environment for a long time to suffer from respiratory diseases is 40% higher than that of ordinary people.
3.Troubleshooting and adjustment
When there is a jamming stoppage, the power should be cut off immediately and the material should be removed. Then check whether there is any damage to the equipment, and if there is any damage, the parts should be repaired or replaced in time.
Adjustment of roll gap is achieved by moving the bearing seat through the adjustment mechanism consisting of hand wheel, threaded glove and tension bolt. The round nut needs to be loosened when adjusting. For example, when materials of different grain sizes need to be crushed, the roll gap can be adjusted according to the actual demand. Generally speaking, the smaller the gap, the smaller the size of the crushed material.
Controlling the size of the feed opening can be achieved through the gate. According to different processing capacity and material characteristics, adjust the size of feed opening to ensure the normal operation of the equipment and efficient crushing.
4.Regular inspection and maintenance
Regular inspection and maintenance of equipment bolts and major components is the key to ensuring the normal operation of the equipment. The bolts and other fixed accessories of the equipment must be brightened every three months to prevent equipment failure due to loosening. At the same time, disassemble and clean the motor bearings, reducer and other major components, and change the oil immediately.
Daily inspection items include whether the screws and nuts are firmly connected and whether the electric circuit is normal. Daily inspection items also include checking whether the work of each part is normal, such as whether the bearing lubrication is normal, whether there is overheating; whether the seals are tight, whether there is no oil leakage; whether the amount of feed is too much phenomenon, whether the grain size of the material meets the requirements; whether the operation of the rollers and gears is normal. Through regular inspection and maintenance, problems can be found and solved in time to extend the service life of the equipment.
With the continuous progress of science and technology, the double roll crusher is developing in the direction of intelligence and automation. Intelligent control system will be more widely used in double roll crusher, through the sensor real-time monitoring of the operating status of the equipment, including roll speed, temperature, vibration and other parameters. Once abnormalities are found, the system will automatically make adjustments or stop the machine to avoid the expansion of the fault. At the same time, it automatically adjusts parameters such as feed volume and rotational speed to adapt to different crushing needs, improve crushing efficiency, and reduce the wear and tear and failure rate of the equipment. And with the diversification of the needs of different industries, the double roll crusher will show the development trend of large-scale and small-scale coexistence. In some large-scale mining, building materials and other industries, need to deal with a large number of materials, the demand for large double-roll crusher will continue to grow. While in some small enterprises or specific areas, such as laboratories, small processing plants, etc., small double-roll crusher will be favoured for its flexibility and convenience. So the application of double roll crusher brings broader prospects and will provide stronger support for the development of various industries.
