Double roller crusher is a kind of crushing machine consisting of roller, supporting bearing, compression and adjusting device, and actuating device, etc. It is suitable for coarse grinding and intermediate crushing in cement plant, chemical industry, electric power station, mining , metallurgical industry, production of building materials and fireproofing materials and other industries. The double roller crusher can crush materials whose compression strength is not more than 160MPa. The discharging size is adjustable, and large-size materials can be crushed into different sizes.
In coal industry, double roller crusher can directly crush the raw coal through deironization and decontamination, and there is no need to remove coal gangue. Crushed materials are of small and even size. Thus, the process of coal dressing is simplified and the production cost is reduced.
Roll crushers are compression type crushers, and were once widely used in mining. They have, within the last 10 or so years, fallen into dis-favor among mining and processing companies. The probable reason is because the large mines require very large crushed product output with minimal cost, makes the roll crusher uncompetitive. The roll crushers are not nearly as productive as cone crushers, with respect to volume, and they do have a little higher maintenance associated with them. Roll crushers do, however, give a very close product size distribution, and if the ore is not too abrasive, they do not have high maintenance costs.
Roll crushers have a theoretical MAXIMUM reduction ratio of 4:1. If a 2 inch particle is fed to the roll crusher the absolute smallest size one could expect from the crusher is 1/2 inch. Roll crushers will only crush material down to a minimum particle size of about 10 Mesh (2 mm). A roll crusher crushes using compression, with two rolls rotating about a shaft, towards the gap between the rolls. The gap between the rolls is set to the size of product desired, with the realization that the largest feed particle can only be 4 times the gap dimension.
The particles are drawn into the gap between the rolls by their rotating motion and a friction angle formed between the rolls and the particle, called the nip angle. The two rolls force the particle between their rotating surface into the ever smaller gap area, and it fractures from the compressive forces presented by the rotating rolls. Some major advantages of roll crushers are they give a very fine product size distribution and they produce very little dust or fines. Rolls crushers are effectively used in minerals crushing where the ores are not too abrasive and they are also used in smaller scale production mining of more abrasive metal ores, such as gold. Coal is probably the largest user of roll crushers, currently, though. Coal plants will use roll crushers, either single roll or double roll, as primary crushers, reducing the ROM coal. Usually, these crushers will have teeth or raised forms on the face of the roll. (Roll crushers used for minerals and metal ores have smooth faced rolls.)
Double Roller Crusher Working Principle:
The discharging size is adjustable. Between the two rollers, there are wedge-shape or gasket adjusting device. There are adjusting bolts in the top of the wedge device. When the adjusting bolts lift the wedge upwards, the wedge pushes movable roller away from the fixed roller, so the gap between two rollers becomes big and the discharging size is big. When the wedge moves downwards, gap between two rollers becomes small under the influence of pressure spring. Discharging granularity is small accordingly.
The gasket device adjusts the discharging size by changing the thickness and quantities of gaskets. The gap between two rollers becomes large when the quantities of gaskets increase, and the gap becomes small when the quantities of gaskets reduce. Drive mechanism adopts two motors which drive triangle belt to drive the rollers to rotate in the opposite directions. When double roller crusher works, materials fall into the gap between rollers through feeding hole. They are compacted and crushed, and then are discharged.
Safety:
To ensure the safety, drive part should be equipped with safety hood according to actual conditions.
Attention:
1. Deironization is very important. If materials that can not be crushed (drill bit, for example) fall into gap between the two rollers, crushing machine may be destroyed. This can cause malfunction of machine. Therefore, iron removal device should be installed to the crushing machine.
2. Adhesive materials may easily block the crushing space. If that happens, you should first stop the machine and then poke the materials.
3. Users should be especially careful when there are many large-size materials, because large materials may be piled out from crushing space and hurt people or damage the equipment .
4. When the double roller crusher have worker for a long time, the roller surface will be abraded. This may result in excessively fine granularity. At that time, users should adjust the discharging hole or inspect the equipment.
5. You should inspect the double roller crusher regularly. Lubricating oil should be added to the double roller crusher on time, to ensure good lubrication state of the equipment.
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Double roller crusher
Double Roller Crusher
Double roller crusher is a kind of crushing machine consisting of roller, supporting bearing, compression and adjusting device, and actuating device, etc. It is suitable for coarse grinding and intermediate crushing in cement plant, chemical industry, electric power station, mining , metallurgical industry, production of building materials and fireproofing materials and other industries. The double roller crusher can crush materials whose compression strength is not more than 160MPa. The discharging size is adjustable, and large-size materials can be crushed into different sizes.
In coal industry, double roller crusher can directly crush the raw coal through deironization and decontamination, and there is no need to remove coal gangue. Crushed materials are of small and even size. Thus, the process of coal dressing is simplified and the production cost is reduced.
Roll crushers are compression type crushers, and were once widely used in mining. They have, within the last 10 or so years, fallen into dis-favor among mining and processing companies. The probable reason is because the large mines require very large crushed product output with minimal cost, makes the roll crusher uncompetitive. The roll crushers are not nearly as productive as cone crushers, with respect to volume, and they do have a little higher maintenance associated with them. Roll crushers do, however, give a very close product size distribution, and if the ore is not too abrasive, they do not have high maintenance costs.
Roll crushers have a theoretical MAXIMUM reduction ratio of 4:1. If a 2 inch particle is fed to the roll crusher the absolute smallest size one could expect from the crusher is 1/2 inch. Roll crushers will only crush material down to a minimum particle size of about 10 Mesh (2 mm). A roll crusher crushes using compression, with two rolls rotating about a shaft, towards the gap between the rolls. The gap between the rolls is set to the size of product desired, with the realization that the largest feed particle can only be 4 times the gap dimension.
The particles are drawn into the gap between the rolls by their rotating motion and a friction angle formed between the rolls and the particle, called the nip angle. The two rolls force the particle between their rotating surface into the ever smaller gap area, and it fractures from the compressive forces presented by the rotating rolls. Some major advantages of roll crushers are they give a very fine product size distribution and they produce very little dust or fines. Rolls crushers are effectively used in minerals crushing where the ores are not too abrasive and they are also used in smaller scale production mining of more abrasive metal ores, such as gold. Coal is probably the largest user of roll crushers, currently, though. Coal plants will use roll crushers, either single roll or double roll, as primary crushers, reducing the ROM coal. Usually, these crushers will have teeth or raised forms on the face of the roll. (Roll crushers used for minerals and metal ores have smooth faced rolls.)
Double Roller Crusher Working Principle:
The discharging size is adjustable. Between the two rollers, there are wedge-shape or gasket adjusting device. There are adjusting bolts in the top of the wedge device. When the adjusting bolts lift the wedge upwards, the wedge pushes movable roller away from the fixed roller, so the gap between two rollers becomes big and the discharging size is big. When the wedge moves downwards, gap between two rollers becomes small under the influence of pressure spring. Discharging granularity is small accordingly.
The gasket device adjusts the discharging size by changing the thickness and quantities of gaskets. The gap between two rollers becomes large when the quantities of gaskets increase, and the gap becomes small when the quantities of gaskets reduce. Drive mechanism adopts two motors which drive triangle belt to drive the rollers to rotate in the opposite directions. When double roller crusher works, materials fall into the gap between rollers through feeding hole. They are compacted and crushed, and then are discharged.
Safety:
To ensure the safety, drive part should be equipped with safety hood according to actual conditions.
Attention:
1. Deironization is very important. If materials that can not be crushed (drill bit, for example) fall into gap between the two rollers, crushing machine may be destroyed. This can cause malfunction of machine. Therefore, iron removal device should be installed to the crushing machine.
2. Adhesive materials may easily block the crushing space. If that happens, you should first stop the machine and then poke the materials.
3. Users should be especially careful when there are many large-size materials, because large materials may be piled out from crushing space and hurt people or damage the equipment .
4. When the double roller crusher have worker for a long time, the roller surface will be abraded. This may result in excessively fine granularity. At that time, users should adjust the discharging hole or inspect the equipment.
5. You should inspect the double roller crusher regularly. Lubricating oil should be added to the double roller crusher on time, to ensure good lubrication state of the equipment.