1.3.4 Equipment selection: The main Floating fish feed production line in the design is the equipment of Jinan FLD Extrusion Co., Ltd.
1.3.5 In the production process, except for raw material handling, finished product stacking, and distribution, other sections are all mechanized operations.
1.3.6 Except for the crusher, granulator, and baler of the production line, the other equipment is controlled in the control room.
1.3.7 In the calculation of equipment selection, according to the machinery industry standard of the People’s Republic of China "Screw Conveyor" (JB/T7679-2008), the bulk density of the powder is calculated as 0.5t/m3; the material to be crushed (mostly cake material The bulk density of) is calculated as 0.56t/m3; the bulk density of corn is calculated as 0.72t/m3; the bulk density of pellet feed is 1.0t according to the National Standard of the People’s Republic of China "General Technical Specification for Ring Molding Granulators" (JB/T20192-2006) /m3 meter.
1.3.8 The design of the buried scraper conveyor is related to the chain speed. According to the national standard of the People’s Republic of China "Buried scraper conveyor" (GB10596-89), the chain speed is divided into 0.08, 0.10, 0.16, 0.20, 0.25, 0.32, 0.40, There are eleven kinds of 0.50, 0.63, 0.80, 1.00m/s. According to the "Transport Machinery Design and Selection Manual", the transportation speed range of p956 corn is 0.20-0.50m/s. We now stipulate that the transportation speed of corn is 0.32m/ s, the transportation speed of cake is 0.25m/s, the speed of powder is 0.20m/s, and the speed of pellets is 0.40m/s.
1.3.9 According to the Machinery Industry Standard of the People’s Republic of China "Vertical Bucket Elevator Type and Basic Parameters" (JB/T 3926.1-1999) Table 1, the lifting speed of the bucket elevator is 1.8m/s. Taking into account that the materials include powder, the material to be crushed (calculated by the cake), corn material, and granular material, the lifting speed of the powder is 1.5m/s, and the material to be crushed (calculated by the cake) The lifting speed is 1.6m/s, the corn feed lifting speed is 1.7m/s, and the pellet lifting speed is 1.8m/s. According to P655 of "Grain Engineering Design Manual", the filling factor of the bucket is 0.55 for powder, 0.6 for crushed material, and 0.8 for granular material.
1.3.10 Bucket elevator hopper selection: Considering the nature of the material, the powder is selected according to the shallow hopper (implementing the JB/T 3926.3-1999 standard). When the lifting capacity is too large to select the shallow hopper, the first consideration Adjust the hopper distance (the minimum hopper distance is greater than 400mm), and in special circumstances, select the deep hopper (implement JB/T 3926.5 －1999 standard); select the granular material according to the deep hopper (implement JB/T 3926.4 －1999 standard).
1.3.11 The production formula designed this time is provided by the customer. The production formula implements the following related standards: [1] Shrimp feed product standard: shrimp compound feed, aquatic industry standard, SC/T 2002-2002. [2] Tilapia feed product standard: Tilapia compound feed, aquatic industry standard, SC/T 1025-2004. [3] Standard for determination of feed crushing particle size: National Standard of the People’s Republic of China, GB/T 5917.1-2008.
1.3.12 Dust and noise control requirements
The dust control evaluation standard of the production workshop is that the dust concentration in the air in the general work area should be less than 10mg/m3, and the dust concentration in the air discharged after ventilation and dust removal should not exceed 150mm/m3. The noise control in the production workshop should meet the following requirements: when the worker’s operating area is 8h, the allowable noise value is 85dB(A); when the worker’s operating area is 4h, the allowable noise value is 93dB(A), and the maximum noise is not Over 115dB (A). The control of dust and noise shall comply with relevant national standards, regulations and regulations.
[1] Code for Design of Noise Control in Industrial Enterprises, National Standard of the People’s Republic of China, GBJ87-85.
[2] Acoustic Environmental Quality Standard, National Standard of the People’s Republic of China, GB3096-2008.
[3] Environmental noise emission standards at the boundary of industrial enterprises, National Standards of the People’s Republic of China, GB12348-2008.
[4] Boiler Air Pollutant Emission Standard, National Standard of the People’s Republic of China, GB13271-2001.
[5] Environmental Protection Emission Regulations for Construction Projects, National Standards of the People’s Republic of China, GB87-85. [6] Comprehensive Emission Standard of Air Pollutants, National Standard of the People's Republic of China, GB16297-1996.
2 Basic characteristics of the production process(Floating fish feed production line) The production workshop of Yiwei Feed Factory consists of four aquatic feed production lines, among which the expanded fish feed production line mainly produces expanded compound feed or powdered feed. The production process consists of raw material feeding, cleaning section, primary crushing section, primary ingredient mixing section, ultra-fine crushing section, secondary ingredient, mixing section, powder packaging section, puffing, drying, cooling section, extruded product packaging section, and rework It is composed of material processing section and extruded material crushing and packaging section.
2.1 Raw material feeding and cleaning section The raw material feeding and cleaning section involves equipment such as material pit, buried scraper conveyor, bucket elevator, cleaning screen, permanent magnet cylinder and distributor. There are four blanking pits. One of the blanking pits puts the raw materials to be cleaned and crushed. It passes through the buried scraper conveyor and bucket elevator, passes through the cylinder on the fifth floor, and enters the permanent magnet cylinder. To be crushed, or transported by a fifth floor buried scraper conveyor to the fourth floor batching bin; two lowering pits are respectively put into the powder material through the buried scraper conveyor, bucket elevator, through the fifth floor cone The powder cleaning sieve, after the permanent magnet cylinder, enters the batching bin on the fourth floor; the powder in the other lowering pit passes through the buried scraper conveyor, bucket elevator, and the cone powder cleaning sieve on the fifth floor, after the permanent magnet cylinder Enter the second batching warehouse on the third floor.
2.2 One-time crushing section One-time crushing section is equipped with four chambers to be crushed and one hammer mill. The crusher adopts impeller feeder for feeding, screw conveyor for unloading and auxiliary suction system. It is lifted to the fifth floor by a bucket elevator, and enters the corresponding batching bin through a rotary distributor.
2.3 Conveying equipment There are two types of conveying equipment: vertical conveying and horizontal conveying. The vertical conveying adopts bucket elevator, and the horizontal conveying adopts buried scraper conveyor and screw conveyor. This design includes 5 bucket elevators, 5 buried scraper conveyors and 1 screw conveyor. Among the 5 bucket elevators, 4 complete the raw materials to enter the workshop; 1 completes the lifting of the crushed materials; the lifting height is configured according to different requirements. Among the 5 buried scraper conveyors, 4 are located at the bottom of the manual feeding pit and 1 is located at the entrance of the rotary distributor; the length of each buried scraper conveyor shall be adjusted accordingly according to the process requirements. The screw conveyor is arranged at the exit of the crusher.
2.4 Silo In this design, 38 silos are included, among which 4 are to be crushed, with a volume of 65m3; 24 are batching bins, with a volume of 290m3; 4 are fine crushing bins, with a volume of 80m3; 6 secondary batching bins are with a volume of 76m3 ; Each silo is equipped with two levelers. In addition, the workshop is equipped with 7 buffer buckets, with a maximum volume of 5.3m3 and a minimum volume of 0.22m3.
2.5 One-time batching and mixing section Floating fish feed production line
One-time batching and mixing section adopts the batching process form of multiple warehouses and three scales. The 24 batching bins are fed through 5 rotary distributors, and each batching bin has a secondary hopper, which is connected to the electronic batching scale through a screw discharge machine. A high-efficiency double-shaft paddle mixer is used to complete the mixing task. In addition to the three electronic batching scales for feeding, the mixer is also equipped with a small material feeding port and a stand-alone dust removal system. A buffer hopper is set at the discharge port of the mixer, and the mixed material enters the micro-grinding bin through the buried scraper conveyor, bucket elevator, powder cleaning screen, permanent magnet cylinder, rotating distributor, etc., or after cleaning and removing impurities The buried scraper conveyor is transported to the fine crushing bin of Line 1. 2.6 Micro-grinding section The 6 micro-grinding bins of the micro-grinding section are fed through a rotary distributor. Each bin is equipped with a silo wall vibrator and corresponds to a micro-pulverizer (3 horizontal micro-pulverizers). Taiwan, 3 vertical micro pulverizers). The finely pulverized materials are pneumatically transported to the fifth floor, and enter the secondary batching bin through a high square screen. 2.7 Secondary batching and mixing section The secondary batching and mixing section adopts the batching process form of multi-warehouse single scale. The 8 batching bins are fed in three ways: one is that the finely pulverized material from pneumatic conveying is conveyed to the batching bin by a buried scraper conveyor; the other is that the finely pulverized material from pneumatic conveying is conveyed to the batching bin by a screw conveyor; It is the cleaned powder from Line
Each batching bin has a secondary hopper, and is equipped with a bin wall vibrator, which is connected to the electronic batching scale through a screw discharge machine. A high-efficiency double-shaft paddle mixer is used to complete the mixing task. In addition to an electronic batching scale for feeding, the mixer is also equipped with a small material feeding port and a stand-alone dust removal system. A buffer hopper is set at the discharge port of the mixer, and the mixed material is distributed to two bucket elevators through a pneumatic tee via an embedded scraper conveyor. One of the bucket elevators lifts the mixed material to the powder product warehouse. The other lifts the mixture to the fifth floor and enters the warehouse to be expanded.
3 Selection and calculation of process equipment
3.1 Raw material feeding and cleaning section No. 101 blanking pit, grid screen No. 101 blanking pit, one blanking pit puts the raw materials to be cleaned and crushed; the other blanking pit Put the powder to be cleaned. According to customer requirements, the two pits have the same geometry, as shown in Figure 1. The geometric volume of the blanking pit is calculated based on the centrally symmetrical truncated cone, is: V blanking pit= 1.2[2×1.5+(2+1.9)(1.5+0.5)+1.9×0.5] /6=2.35( m3) For the lowering pit where powder is put, the bulk density is 0.5t/m3, and the amount of powder that can be held at one time in the lowering pit is: Q powder=γV=0.52.35. For the feeding pit where the material to be crushed is put into consideration, the bulk density is 0.56t/m3 based on the cake material, and the amount of powder that the feeding pit can hold at one time is: Q cake meal=γV=0.562.35=1.316t. Get the document, it’s more convenient to use. ￥18.00 There are 80 unread pages left to purchase. Continue reading Waterdrop Fundraising-The Fundraising Platform for Major Diseases has no money to raise funds for major illnesses. Quickly initiate fundraising applications and quickly raise money for treatment Waterdrop raises funds for serious illness, and quickly helps you solve your urgent needs. View details
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