mining equipment

sand making machine, mobile crusher

How to improve the service life and capacity of Raymond Mill?

2021-06-29 11:57:52 | 日記
How to improve the capacity of Raymond Mill?

Raymond mill equipment has been widely used in many industries, the use of Raymond mill to control the nature of the material, can not be too hard, too wet, too sticky, if the material is too wet, it can be air dried and other methods to deal with, want to improve the output of Raymond mill, it is necessary to do the following, so that it is possible to improve the output:

1. Material properties

The hardness, humidity and other properties of the material will also have a greater impact on the processing capacity. For the materials with high hardness and high humidity, it is difficult to deal with in the grinding process, and it is easy to have problems such as adhesion, so the processing capacity is smaller. For the materials with low hardness and low humidity, it is easy to grind, so the processing capacity is larger.

2. Product fineness requirements

Different customers have different requirements for the fineness of the finished product after grinding. If the user has very high requirements for the fineness of the finished product, the finer the material, the smaller the grinding capacity. On the contrary, if the user's requirements for the fineness of materials are low, the processing capacity will naturally increase.

3. The humidity of the material is not good. When the moisture content of the material to be ground is relatively large, it is easy to adhere in the process of grinding, which will cause blockage and affect the processing capacity.

How to improve the service life of Raymond Mill?

In order to prevent the corrosion and wear of Raymond mill, various new processes and methods have appeared in recent years. From the economic and technical point of view, Raymond mill often uses metal or non-metal protective layer on the surface of parts, such as covering the metal surface with zinc, chromium, nickel, tin, copper, aluminum, lead and other metal materials by heat treatment, electroplating or metal spraying, Or paint (sefan, qingfan, mineral oil, Vaseline, paraffin solution, etc.) on the surface of parts as anti-corrosion coating.

The hot wear parts of Raymond mill work directly under the condition of high temperature, the metal surface will be severely oxidized, the mechanical properties of the metal and the geometric dimensions of the parts will be affected, and even the surface of the parts will be burned.

This kind of damage caused by high temperature is called thermal wear. There are a lot of Raymond mill equipment in the factory are working at a very high temperature, such as the ironmaking furnace of the metallurgical factory, the accessories of the refining furnace, the accessories of various heating furnaces, the accessories of the pot calciner, rotary kiln and its accessories of the carbon cable factory, the accessories of the roasting furnace and the graphitization furnace, etc. Because these equipments and accessories work under high temperature for a long time, the phenomenon of thermal wear is very serious.

The degree of thermal damage of Raymond mill parts depends on the high temperature and temperature of the parts in the work and the time of bearing load under this high temperature condition. Some parts work under the condition of high temperature and heavy load for a long time, and their thermal wear is serious. While some parts work under the condition of high temperature, because the heating time of Raymond mill is not long, or periodic heating and cooling, the effect of thermal wear is also slight.

Whether the parts of Raymond mill can maintain the stability of oxidation at high temperature is an important condition for the parts of Raymond mill to work continuously at high temperature. The initial stage of surface oxidation is a chemical process. When the oxidation is further strengthened, it becomes a complex thermochemical process.

Working Principle of Different Grinding Mills

2021-06-24 16:27:13 | 日記
Raymond mill is a kind of common grinding equipment. On the basis of economic and technological development, Raymond mill has developed into several special types, such as powerful mill, ultrafine mill, and high-pressure mill.

As a powerful mill, it adopts a high-pressure device on the basis of ordinary Raymond mill, and a high-pressure spring is set in the grinding device to increase the grinding pressure between the grinding roller and the grinding ring by 1.2 times. When the grinding roller and ring are worn to a certain extent, the length of the high-pressure spring is adjusted to keep the constant grinding pressure between the grinding roller and ring, so as to ensure the stable quality.

At the same time, in the grinding device, through technical improvement, the contact area between the grinding roller and the grinding ring is large, which avoids the phenomenon that small particles can not be continuously crushed in the uneven gap in the general grinding machine. According to the Bernoulli equation calculation of gas flow and the results of simulation experiment, the geometric shape of the blade in the fineness classifier is changed, and the inclination angle and relative clearance of the baffle are readjusted, so that the ultra-fine powder entering the classification can be separated effectively.

As a high-pressure micro powder mill, it is mainly composed of main machine, blower, ultra fineness analyzer, finished product cyclone dust collector, bag filter and connecting air pipe. According to the needs of users, it can be equipped with auxiliary equipment such as hoist, storage bin, electric control cabinet, feeder, crusher, etc. In the grinding chamber of the micro powder mill, the grinding roller assembly is suspended on the grinding roller hanger through the cross arm shaft. The grinding roller hanger is fixedly connected with the main shaft and the spade rest. The pressure spring is tightly pressed on the outer end of the cantilever of the bearing chamber of the grinding roller by the tension rod. With the cross arm shaft as the support point, the grinding roller is tightly pressed on the inner circular surface of the grinding ring by the spring pressure. When the motor rotates through the transmission device, the grinding roller is pressed on the inner circular surface of the grinding ring, The blade mounted on the blade rack rotates synchronously with the grinding roller, and the grinding roller rotates around itself while rolling on the inner circular surface of the grinding ring. The analyzer drives the impeller of the analyzer to rotate through the motor drive device, and the speed adjustment of the analyzer determines the fineness of the powder.

Ultrafine mill is mainly composed of main machine, fan, separator, powder collector, dust collector and other parts. The main machine is divided into three parts: crushing room, plug room and fan room. During the operation of the machine, the material is put into the crushing chamber through the feed port, and then crushed by the impact between the blade fixed on the spindle and the liner plate of the casing and the shearing of the high gas injection. The crushed material enters the fan chamber by stages through the plug compartment, and the material enters the separator by the blowing of the wind wheel and the gravity of the machine, and then is treated by the separator again, The coarse material is returned to the crushing chamber by the return nozzle for re crushing, the finished material is led out by the induced draft fan and packed in the powder collector, and the residual air is discharged by the dust removal device.

It can be seen that these kinds of mills developed on the basis of Raymond mill have great advantages, which have an important impact on the development of its grinding industry. On this basis, Raymond mill will have further development.

Why choose new sand making machine?

2021-06-18 14:44:22 | 日記
Sand making machine is a kind of commonly used mine crushing equipment, which has a wide range of uses. Sand making machine is widely used in various ores, cement, refractories, bauxite clinker, emery, glass raw materials, machine-made building stone, gold slag, silicon carbide, sand and other high hard, extra hard and wear-resistant materials. Compared with the traditional fine crusher, it can save 50% energy and is a new advanced sand making machine.

Application scope of new sand making machine

1. Artificial sand making of river pebble, mountain stone (limestone, granite, basalt, diabase, andesite, etc.), ore tailings and stone chips.

2. Construction aggregate, road fabric, cushion material, asphalt concrete and cement concrete aggregate production.

3. In the field of water conservancy and hydropower, high-grade highway, expressway, high-speed railway, passenger dedicated line, bridge, airport runway, municipal engineering, machine-made sand production and stone shaping of high-rise buildings.

4. Fine crushing process before grinding in mining field, material crushing in building materials, metallurgy, chemical industry, mining, refractory, cement, abrasive and other industries.

5. High abrasiveness and secondary disintegration crushing, desulfurization in thermal power and metallurgical industry, steel slag, construction waste crushing and other environmental protection projects.

Why choose new sand making machine

1. High yield

High crushing efficiency, fine crushing and rough grinding. The treatment capacity and output can reach 50-500t / h. compared with the traditional equipment under the same power, the output is increased by 30% and stable.

2. Easy installation:

The utility model has the advantages of simple structure, convenient installation and maintenance, various installation methods, movable installation and low operation cost.

3. Excellent particle size:

The product has excellent grain shape, cube shape and low needle flake content, which is suitable for aggregate shaping, artificial sand making and high-grade highway specification stone making; Moreover, it has strong ability to pass through non broken materials and is less affected by the moisture content of materials, with the moisture content up to 8%.

4. Low noise and less pollution

The working noise is lower than 75 dB and the dust pollution is less; In addition, the bulk density of the equipment is large, and the iron pollution is very small.

5. Reduce downtime:

Hydraulic device, easy to maintain - hydraulic cover opening device, makes the maintenance and replacement of parts in the crushing chamber convenient and fast, shortens the downtime, saves time and labor.

6. High automation, safety and reliability

Automatic detection, safe and reliable - set up the vibration display and alarm device, if the equipment has bad operation, it can send out a warning, so that the equipment stops working, to achieve the purpose of protecting the machine.