DGS series single roller slag crusher

The following dedicated features should be translated in an accurate and professional way for the convenience of reading. 

In order to cater for different needs of power plants, DGS-830 gear is structured as A, B and C types, as illustrated in FIGs. 1, 2 and 3 respectively. The shaft seal between the two walls of the roller machine is also structured in three types, i.e. "half hole labyrinth" type", "multi-slot labyrinth" type and "water-separating packing", as illustrated in FIGs. 4, 5 and 6 respectively. Its body is structured as Q, V and Y types, as shown in FIGs. 7, 8 and 9 respectively. It is described as follows: 

The A-type gear roller is as shown in FIG. 1. Its roller surface is entirely arranged with high roller gear plate. After crushing, it produces finer particles and therefore is a good solution for occasions with strict requirements for particle size. 

The B-type gear roller is the most widely used model, as illustrated in FIG. 2. The worn gear plate can be replaced with a new one after failure. 

The C-type gear roller, as illustrated in FIG. 3, is suitable for sea water slag removal or strong coking slag crushing. The roller gear ring of the involute gear is installed on the drum-shaped roller shaft, and only one end of it is fastened through six bolts and nuts. When replacing the roller gear ring, the bolts and nuts are also replaced to adapt to seawater corrosion. The C-type gear roller has stronger crushing force then A-type and B-type ones to produce better slag crushing effect in case of strong coking. 

The jaw plate is designed to be hook-shaped and embedded on the adjustable jaw body. As it does not need to be fastened by bolts, it is convenient for replacement and cost-effective. 

The structure of the "half hole labyrinth" shaft seal (code H) is as illustrated in FIG. 4. It is suitable for continuous slag removal. 

The structure of the "multi-slot labyrinth" shaft seal (code M) is as illustrated in FIG. 5. It is a good solution for closed or semi closed regular slag discharge at inlet and outlet or only at inlet isolated from the atmosphere. 

The structure of "water-separating packing" shaft seal (code W) is as shown in FIG. 6. It is only suitable for slag crushers installed in underground ash pump room. 

The "water-separating packing" shaft seal is not only useless but also harmful when it's unnecessary as it increases unnecessary water consumption, shaft neck corrosion and routine maintenance. 

As the "half hole labyrinth" and "multi-slot labyrinth" shaft seals consume no water, have no packing (which corrodes the shaft neck), and do not need routine maintenance, they are well received in power plants. 

The structure of Q-type body is as shown in FIG. 7. It is a good solution for continuous slag crushing under the boiler without the need of flange connection at inlet and outlet. 

The structure of V-type body is as shown in FIG. 8. It is a good solution for slag crushing under the boiler with flange connection but without the need of flange connection at outlet. 

The structure of Y-type body is as shown in FIG. 9. It is a good solution for slag crushing under closed boilers or in ash pump rooms where flange connection is required at inlet and outlet. 

The upper and lower interfaces matching with the V-type body are convenient for the welding of the upper and lower inlet and outlet pipes, and the upper flange surface inclines by 10° horizontally for the convenience of loading and unloading of the slag crusher. The side large hand hole is designed to replace the gear plate and jaw plate, and take out metal and other foreign matters that block the slag crusher. 

DGS-830 can crush materials with strength similar to that of limestone (CaCO3) thanks to its large crushing force. Its slag crushing capacity varies due to different ash conditions. When the ash-water mixture passes through the slag crusher (such as "regular slag discharge by large ash hopper") or is assisted with water spray to wash the jaw plate of the slag crusher, it can produce an output of as high as 60th (dry basis). When ash passes through the slag crusher after dehydration and there was no water spray to wash the jaw plate, its output can reach 20t/h (dry basis). When the diameter of a large number of ash blocks is greater than 200mm, its output will be reduced. 

The drive mechanism of DGS-830 consists of a cycloidal planetary gear speed reducer, fluid coupling and ordinary asynchronous AC motor. Thanks to its electric "automatic slag discharge" and electric and hydraulic two-stage overload protection features, it is safe and reliable. For the purpose of automatic troubleshooting and protection, the electric automatic slag crusher will rotate forward and backward alternately when the slag crusher is stuck due to overload. The fluid coupling can prevent the motor from burning out due to dead halt and drive the input end of the coupling to keep rotating (the output end is blocked), so that the coupling can rapidly heat up to the oil base melting point (125℃) to release oil and load. 

The driving from the drive mechanism to the slag crusher is achieved through coupling rotation or chain drive to cater for different needs in different use environments. Coupling rotation should be preferred. As the chain rotation increases the radial load of the bearing and reduces the service life of the bearing, the chain and sprocket need to be lubricated and sealed, and must be fastened by foundation bolts and a chain tension adjustment mechanism must be available. Chain drive is considered only when there is too much water in the environment or the space dimensions does not allow coupling drive. In order to shorten the overall length of the coupling drive, a backup coupling drive of belt drive coupling is provided for use when necessary. 

The left and right ends of the coupling drive and chain drive are both distinguished. The drive mechanism at the left end of the slag crusher (facing the nameplate of the slag crusher) is the left drive, while that at the right end of the slag crusher is the right one.