Definition of shrimp and crab feed:
shrimp and crab feed, as the name suggests, it is hard pellet feed used for feeding aqua animal like shrimps and crabs. 1.5-2.5t/h shrimp and crabs feed set has high requirement for the fineness of grinded feed, degree of gelatinization and good water resistance according to shrimp and crab"s physiological characteristics.



Raw material:
the normal raw material will be soybean meal, rapeseed meal, cottonseed meal, wheat flour, yeast powder, fish meal, meat and bone meal and etc.,

Process intro:
the shrimp and crab feed has following characteristics: fine grinded particles(Pacific white shrimp feed requires 59% should be with 80mesh), high requirement for curing and conditioning(SZLH420x pellet mill adopt double shaft differential speed conditioner, retainer and jacket conditioner), good water resistance(using post-curing process), small diameter for finished pellet (the diameter around 1.0-2.5mm).  The output for this SZLH420x shrimp and crab feed is designed as 1.5-2.5t/h, with first grinding line, first batching and mixing line, second micro-grinding line, second batching and mixing line, single pelleting line and bagging line. the total power will be 605KW, production area dimension is : 22x17.5x30m, matching 1T boiler.  SZLH420x 1.5-2.5t/h shrimp and crabs feed set is characterized by compact design and reasonable structure, and the satisfaction of environment protection requirements, meanwhile it can be directed to customers design.



Technological process chart:
RM receiving and cleaning process---first grinding process---first batching and mixing process--micro-grinding process--second mixing process--pelleting process- bagging process

Process Details:

RM receiving and cleaning process:
Cleaning is playing a role to  remove the impurities from raw material, including large impurities , nonmagnetic impurity like rope, clod and corn cob, and magnetic impurity like iron nails. It will ensure the quality of products and safety of following processing machine. the cleaning process for shrimp and crab feed set is including granule receiving cleaning and powder receiving cleaning.

cleaner: granule precleaner SCY80, output 20-30t/h, podwer cleaner SQLZ60X50X100, output 10-15t/h







First grinding process:
Single hammer mill is used in this grinding process of 1.5-2.5t/h shrimp and crabs feed set, two pre-grinding bin is set above the hammer mill. To make sure the safe running of hammer mill, the raw material should remove impurities through magnetic device. The cleaned material will go to the grinding bin for grinding. After grinding, the material will transported into bucket elevator by screw conveyor then go into the batching bins through distributor. when transported by screw conveyor, auxiliary suction system is also adopted to save energy consumption, prevent dust and reduce the material"s temperature and improve the grinding efficiency.

grinding machine: hammer mill: SFSP668*600,55KW, output 5-7t/h



first batching and mixing process:
the batching process of 1.5-2.5t/h shrimp and crab feed set is a process to weigh kinds material accurately by specific device according to the different animal"s formula to meet the nutritional requirement. Mixing is the process for kinds raw material for feed interblend each other to be in homogeneous distribution under the external force after batching . In this process, one batching scale with 12 batching bins are used, the additives are manual added.  The material are mixed in mixer after batching then discharged by chain conveyor and bucket elevator.

Weighing machine: batching scale PCS05, automatic weighing accuracy≤3‰.
mixing machine: mixer SLHY1,11kw, 500kg/P, output: 3-6t/h, homogeneity CV≤7%



Micro-grinding process;
As the development of aqua feed and other specific feed, it has high requirement for particle size after grinding, usually it demand for 80-120mesh which cannot get through normal hammer mill, so we designed pulverizer. 1.5-2.5t/h shrimp and crabs feed set is equipped with single pulverizer, discharging in pneumatic transportation with cyclone, pulse filter. Moreover, the fineness could be adjusted according to customer.

 pulverizer: SWFL110,110+11+2.2KW;output:2-4T/H



Second mixing process:
this process is used to mixing the material after micro-grinding with manual adding materials, two bathing bins , one double shaft mixer and one extra manual adding inlet are designed.

Mixing machine: Mixer SHSJ1,11KW,500kg/P, output: 3-6t/h, homogeneity CV≤5%



Pelleting Process:
the purpose of pelletize is to make use of the heat, moisture, and pressure in pelleting process to pelletize the feed which may be loose, easy to dust, with poor palatability and hard to transport, then the feed could be with better palatability, lower feed conversion rate, reduce feed waste and environmental pollution. In this process, we use one set belt driven shrimp feed pellet mill SZLH420x which adopt double shaft differential speed conditioner, retainer and jacket conditioner, it ensure the requirement for curing ahead. two pellet bins are set above theSZLH420x pellet mill. The finished pellets will make the post curing processing in stabilizer to improve the feed stability in water, then to be cooled in the cooler, after that go into the rotary screener for shifting through bucket elevator , finally the finished product are packed into the bagging bins.

pelletize equipment: pellet mill SZLH420x with 45*2KW, output for shrimp feed:1.5-2.5t/h.  Stabilizer : SWDB4 with 1.1+1.5KW  Cooling machine: SKLB4 with 1.1+1.5KW , volume 4m³, output 4-5T/H



Bagging process:
1.5-2.5t/h shrimp and crabs feed set add a rotary screener after the finished product bin, it will reduce the powder among the finished pellets. pellet packing scale is used.

Bagging machine: quick pellet packing scale, capacity 20-50kg per bag, 6-8bag per minute.



Auxiliary system:
1.5-2.5t/h shrimp and crabs feed set adopt dust collection system in bagging process to improve the working condition, oil adding system is usually added in mixing system to improve feed palatability.