Automatic raw material conveying system

Abstract

The invention relates to an automatic raw material conveying system and belongs to the technical field of raw material conveying, the automatic raw material conveying system comprises a dust remover, a vibrating screen, a pneumatic conveying pipeline, a plurality of bins and a PLC, one end of the pneumatic conveying pipeline is connected with the output end of the vibrating screen, and the other end of the pneumatic conveying pipeline is connected with the bins through a discharger; the pneumatic conveying pipeline is connected with a fan, the dust remover is connected with each stock bin, each stock bin is internally provided with an induction level gage, and the fan and the induction level gage are both connected with a PLC (Programmable Logic Controller). The full-process automatic treatment from feeding, storage to ingredient conveying is achieved, the continuity and stability of material conveying are remarkably improved, the labor intensity of workers is reduced, and meanwhile the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a raw material automatic conveying system, belonging to the technical field of raw material conveying. BACKGROUND

[0002] PET (Polyethylene Terephthalate) is a common thermoplastic plastic, widely used in packaging, fibers, and other various industrial products. It is a polymer generated by the polymerization of terephthalic acid (TPA) and ethylene glycol (EG).

[0003] In the chemical fiber industry, after the PET raw material is heated and dried by the drum, it is sent to the screw extruder for melting, and then extruded for spinning. Because the distance is far and the drum heating is intermittent, the two processes cannot be continuous, so a bin is added in the middle process. During the conveying and storage of the heated material, the material will contact with the air, and the moisture will increase again. Therefore, continuous heat preservation is required during storage to further reduce the moisture. In addition, the PET raw material after drum heating is manually sent to the bin. Because the drum position is lower than the bin position, manual labor is required to pull the material car through the elevator to transport up and down. Not only does it require a large amount of manual labor, but it also affects the conveying efficiency.

[0004] Therefore, there is a need for a raw material automatic conveying system to improve the conveying efficiency of the raw material and reduce the labor intensity of workers. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a raw material automatic conveying system that improves the conveying efficiency of the raw material and reduces the labor intensity of workers.

[0006] The technical scheme adopted by the present application to solve the above problems is a raw material automatic conveying system, comprising a dust collector, a vibrating screen, a pneumatic conveying pipeline, a bin and a PLC controller. The bin is provided with a plurality of bins. One end of the pneumatic conveying pipeline is connected with the output end of the vibrating screen. The other end of the pneumatic conveying pipeline is connected with each bin through a discharger. A fan is connected to the pneumatic conveying pipeline. The dust collector is connected with each bin. Each bin is provided with an inductive level meter. The fan and the inductive level meter are connected with the PLC controller.

[0007] As a preferred, the number of inductive level meters in the same bin is three, and the three inductive level meters in the same bin are distributed from top to bottom.

[0008] As a preferred, the pneumatic conveying pipeline is divided into three independent channels, respectively corresponding to the conveying requirements of black, white and bright white materials.

[0009] As preferred, the silos are 45 in total, divided into three groups, 15 in each group, for storing black, white and bright color materials respectively.

[0010] As preferred, the volume of the silo is 200 cubic meters, and a single silo stores 80 tons of material according to the average bulk density of 0.4, with a total storage capacity of 3600 tons, and the silo is placed in a space of 60 meters long, 12 meters wide and 22.8 meters high.

[0011] As preferred, the filter cartridge of the dust collector adopts a film filter bag with a filtering precision of 0.02um.

[0012] As preferred, the bottom of the silo is connected with a bulk fluidizer, which is connected with an external gas source through an air charging pipeline.

[0013] As preferred, the bulk fluidizer comprises a fluidizing disc, a connecting pipe and a mounting seat, the mounting seat is fixedly arranged at one end of the connecting pipe, the fluidizing disc is fixedly sleeved on the mounting seat, the fluidizing disc is conical, the large-diameter end of the fluidizing disc is arranged towards the connecting pipe, a locking ring is coaxially and detachably fixedly sleeved on the connecting pipe, the connecting pipe is connected with a gas source, the mounting seat is provided with a gas hole, the inner cavity of the connecting pipe is communicated with the inner cavity of the fluidizing disc through the gas hole, and the fluidizing disc is elastic.

[0014] As preferred, one end of the fixing ring is provided with an annular groove, one end of the elastic rod is provided with a protruding block, and the protruding block is inserted into the annular groove.

[0015] As preferred, the discharging end of the silo realizes automatic discharging through an air locking back gas automatic control valve.

[0016] Compared with the prior art, the present application has the following advantages: The raw material automatic conveying system realizes full-process automatic processing from feeding to storage and then to batching and conveying, significantly improves the continuity and stability of material conveying, reduces the labor intensity, and improves the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a structural schematic view of the raw material automatic conveying system of the present application; Figure 2 Fig. 2 is an A-A direction sectional view of the raw material automatic conveying system of the present application; Figure 1 Fig. 3 is a B-B direction sectional view of the raw material automatic conveying system of the present application; Figure 3 Figure 1 Fig. 4 is a C-C direction sectional view of the raw material automatic conveying system of the present application; Figure 4 Fig. 5 is a D-D direction sectional view of the raw material automatic conveying system of the present application; Figure 1 Figure 5 ​​It is a sectional view of the bulk material fluidizer; Figure 6 It is a sectional view of the bulk material fluidizer; Figure 7 It is Figure 6 The D part enlarged view.

[0018] Among them: Dust collector 1, vibrating screen 2, pneumatic conveying pipeline 3, silo 4, unloader 5, fan 6, inductive material level meter 7, automatic control valve 8, bulk material fluidizer 9; Fluidized disc 91, connecting pipe 92, mounting seat 93, locking ring 94, air hole 95, fixing ring 96, elastic rod 97, annular groove 98, protrusion 99. Specific embodiments

[0019] As Figures 1-7 shown, the raw material automatic conveying system in the embodiment comprises a dust collector 1, a vibrating screen 2, a pneumatic conveying pipeline 3, a silo 4 and a PLC controller, the silo 4 is provided with a plurality of, one end of the pneumatic conveying pipeline 3 is connected with the output end of the vibrating screen 2, the other end of the pneumatic conveying pipeline 3 is connected with each silo 4 through the unloader 5, the pneumatic conveying pipeline 3 is connected with the fan 6, the dust collector 1 is connected with each silo 4, each silo 4 is provided with an inductive material level meter 7, the number of inductive material level meters 7 in the same silo 4 is three, the three inductive material level meters 7 in the same silo 4 are distributed from top to bottom, and the fan 6 and the inductive material level meter 7 are connected with the PLC controller; During work, the forklift transports the PET raw material in the form of ton bags or small bags from the input end of the vibrating screen 2 into the vibrating screen 2, screens out unqualified raw materials through the vibrating screen 2, and conveys qualified raw materials to the pneumatic conveying pipeline 3, so that the raw materials are conveyed in the pneumatic conveying pipeline 3 through the fan 6, the materials in the pneumatic conveying pipeline 3 are automatically distributed to each silo through the unloader 5, and the situation that the raw materials enter the silo 4 is automatically detected through the inductive material level meter 7, so that the automatic conveying of the raw materials is realized, the work efficiency is improved, and the labor intensity of workers is reduced; During raw material conveying, dust removal is realized through the dust collector 4 to meet the environmental protection acceptance requirements; When the silo 4 is discharged, the material is conveyed to the positive pressure dilute phase silo by the sealed magnetic separation conveyor, and the discharge end of the silo 4 realizes automatic discharge through the automatic control valve 8 of the air sealing back gas, wherein the automatic control valve 8 of the air sealing back gas is connected with the PLC controller; Among them, three sets of raw material storage conveying systems and two sets of raw material batching conveying systems Three sets of raw material storage conveying systems: 1. Black material storage conveying system; According to the material, 15 silos 4 are built, and the silo 4 is designed to store 1200 tons of 200m³ of raw materials; Conveying capacity: 20000KG ~ 22000 Kg / h; conveying distance: H10m + V25m + H70m; 2. White material storage and conveying system; According to the material, 15 hoppers 4 are built, and 200 m³ of storage is designed for 1200 tons; Conveying capacity: 20000KG ~ 22000 Kg / h; conveying distance: H10m + V25m + H70m; 3. White material storage and conveying system; According to the material, 15 hoppers 4 are built, and 200 m³ of storage is designed for 1200 tons; Conveying capacity: 20000KG ~ 22000 Kg / h; conveying distance: H10m + V25m + H70m; 4. Equipped with four air blowers, three for use and one for standby; The entire pneumatic conveying system is controlled by PLC system, realizing unmanned automatic control, and the conveying capacity of the pneumatic conveying system can guarantee the annual design capacity requirement of the system; Raw material batching and conveying system two sets: 1. Black material batching and conveying system; According to the rotary dryer, 16 batching hoppers 4 are built, and 5 m³ of batching is designed for 2.5 tons of material; Conveying capacity: 10000KG ~ 11000 Kg / h; conveying distance: H20m + V30m + H60m; 2. White and white material batching and conveying system; According to the rotary dryer, 17 batching hoppers 4 are built, and 5 m³ of batching is designed for 2.5 tons of material; Conveying capacity: 10000KG ~ 11000 Kg / h; conveying distance: H20m + V30m + H60m; 3. Equipped with three air blowers, two for use and one for standby; The entire pneumatic conveying system is controlled by PLC system, realizing unmanned automatic control, and the conveying capacity of the pneumatic conveying system can guarantee the annual design capacity requirement of the system; Application and design parameters are as follows: a. Meteorological conditions a1. Temperature Extreme maximum temperature 50.0℃; Extreme minimum temperature -10.0℃, annual average temperature 16.7℃; Cumulative annual coldest month average temperature -3.6℃; The lowest value of monthly average minimum temperature -4.2℃, the lowest daily average temperature -5℃ Average temperature of the warmest month (July) 40°C; average temperature of the coldest month (January) -1.6°C Outdoor calculation temperature for winter heating -1°C Outdoor calculation temperature for summer ventilation 27°C Outdoor calculation temperature for winter air conditioning -1°C Outdoor calculation temperature for summer air conditioning 30.6°C a2, atmospheric pressure Annual average atmospheric pressure 1000 hPa a3, humidity Annual average relative humidity 96% Monthly average maximum relative humidity 98% (August) Monthly average minimum relative humidity 53% (April) Daily average maximum relative humidity (summer) 96% Daily average maximum relative humidity (winter) 82% b, weather conditions Delivery air: b1, instrument air Operating pressure: 0.6 MPa (G) Operating temperature: normal temperature Design pressure: 0.8 MPa (G) Design temperature: 60°C Dew point: -10°C Dust content: no dust Oil content: oil content controlled below 0.1 ppm c, the design is based on the following: c1, raw material storage and conveying system three sets: c11, black material: vibration dedusting feeding bin 4, automatic conveying system conveying material to raw material storage bin 4, raw material storage and conveying system built on the ground -3 meters, raw material batching and conveying system built on the ground -3 meters, raw material batching bin 4 roof +28 meters, black raw material storage bin 4 a total of 15; Material name: PET granules Moisture content: ≤5% Bulk density of material: calculated at 0.5 g / cm3 Conveying distance: height 25 meters, horizontal about 70 meters Conveying capacity: 20000-22000 kg / h Quantity: 1 set Fan 6: Roots blower, three for one standby, switching through automatic or manual valve c12, white material: vibration dedusting feeding bin 4 feeding, automatic conveying system conveying material to raw material storage bin 4, raw material storage bin 4 is built on the ground floor, the outer dimensions are 60m*12m*22.8m, raw material storage conveying system is built on the ground-3m, raw material batching conveying system is built on the ground-3m, raw material batching bin 4 top floor +28m, and there are 15 white raw material storage bins 4.

[0020] Material name: PET granules; Moisture content: ≤5%; Bulk density of material: calculated according to 0.5g / cm3; Conveying distance: height 30m, horizontal about 80m; Conveying capacity: 20000-22000kg / h; Quantity: 1 set Fan 6: Roots fan, three in one standby, automatic or manual valve switching; c13, white material: vibration dedusting feeding bin 4 feeding, automatic conveying system conveying material to raw material storage bin 4, raw material storage bin 4 is built on the ground floor, the outer dimensions are 60m*12m*22.8m, raw material storage conveying system is built on the ground-3m, raw material batching conveying system is built on the ground-3m, raw material batching bin 4 top floor +28m, and there are 15 white raw material storage bins 4.

[0021] Material name: PET granules; Moisture content: ≤5%; Bulk density of material: calculated according to 0.5g / cm3; Conveying distance: height 30m, horizontal about 80m; Conveying capacity: 20000-22000kg / h; Quantity: 1 set; Fan 6: Roots fan, three in one standby, automatic or manual valve switching; c2, raw material automatic batching pneumatic conveying system 2 sets: c21, black material: vibration dedusting feeding bin 4 feeding, automatic conveying system conveying material to raw material storage bin 4, inductive material level meter 7 metering material, automatic metering and feeding, fan 6 automatically conveying material to production area batching bin, according to the production progress automatic feeding; raw material storage bin 4 is built on the ground floor, raw material storage conveying system is built on the ground-3m, raw material batching conveying system is built on the ground-3m, raw material batching bin 4 top floor +28m, and there are 16 black raw material storage bins 4; Material name: PET granules; Moisture content: ≤5%; Bulk density of material: calculated according to 0.5g / cm3; Transport distance: height 30 meters, horizontal about 80 meters; Transport capacity: 10000-11000 kg / h; Quantity: 1 set; Fan 6: Roots blower, two for one spare, through the manual valve switching; c22, white material: vibration dust removal feeding bin 4 feeding, automatic conveying system conveying material to raw material storage bin 4, inductive material level meter 7 metering material, automatic metering feeding, fan 6 automatically conveying material to production area batching bin, according to the production progress automatic feeding; raw material storage bin 4 is built on the ground floor, raw material storage conveying system is built on the ground-3 meters, raw material batching conveying system is built on the ground-3 meters, raw material batching bin 4 top floor +28 meters, white raw material storage bin 4 total 17; Material name: PET granules; Moisture content: ≤5%; Material bulk density: calculated according to 0.5 g / cm3; Transport distance: height 30 meters, horizontal about 80 meters; Transport capacity: 10000-11000 kg / h; Quantity: 1 set Fan 6: Roots blower, two for one spare, through the manual valve switching; d, material parameters d1, the name of the treated material: PET granules; d2, the bulk density, angle of repose and so on of the treated material; Table 1, bulk density, angle of repose and so on of the material

[0022] e, conveying parameters and design points e1, black PET material collection and conveying system (1 set)

[0023] e2, white PET material collection and conveying system (1 set)

[0024] e3, black PET material collection and conveying system (1 set)

[0025] e4, white PET material collection and conveying system (1 set)

[0026] e5, public works list

[0027] The above compressed air consumption is the average value of system design, considering the uncertainty factors in the process of system operation, and the change of pipeline path in the final design process, etc., the total compressed air demand needs to provide about 20%~30% of the total gas consumption to ensure the stability of the system; The filter cartridge (or filter bag) of the dust collector 1 needs to use a coated filter bag with a filtering precision of 0.02um; The dust collector 1 is connected with an automatic fire extinguishing device, and the fire extinguishing device is a sprayer connected with a water pipe. When the dust collector 1 catches fire, the water in the water pipe is sprayed from the sprayer and acts on the fire source to achieve fire extinguishing; It also includes a lightning protection device to prevent lightning damage; The bottom of the stock bin 4 is connected with a bulk material fluidizer 9, which is connected with an external air source through an air charging pipeline. When the air source is started, the fluidizer forms a uniform air cushion at the bottom of the stock bin 4, promoting the uniform flow of the material and preventing the occurrence of plugging or mouse hole phenomenon. This design ensures the quality stability of the material during storage; The bulk material fluidizer 9 includes a fluidizing disc 91, a connecting pipe 92 and a mounting seat 93. The mounting seat 93 is fixedly arranged at one end of the connecting pipe 92. The fluidizing disc 91 is fixedly sleeved on the mounting seat 93. The fluidizing disc 91 is conical, and the large-diameter end of the fluidizing disc 91 is arranged towards the connecting pipe 92. A locking ring 94 is coaxially and detachably fixedly sleeved on the connecting pipe 92. The connecting pipe 92 is connected with an air source. The mounting seat 93 is provided with air holes 95. The inner cavity of the connecting pipe 92 communicates with the inner cavity of the fluidizing disc 91 through the air holes 95. The fluidizing disc 91 is elastic. During use, the large-diameter end of the fluidizing disc 91 is attached to the inner wall of the stock bin 4. After the locking ring 94 is fixedly sleeved on the stock bin 4, the locking ring 94 abuts against the outer wall of the stock bin 4, achieving installation. The air source is started to deliver air into the connecting pipe 92. The air in the connecting pipe 92 is delivered into the fluidizing disc 91 through the air holes 95, increasing the air pressure in the fluidizing disc 91. Through the action of air pressure, the large-diameter end of the fluidizing disc 91 is deformed and separated from the inner wall of the stock bin 4. In this way, the air in the fluidizing disc 91 can enter the stock bin 4 and flow along the inner wall of the stock bin 4, making the material separate from the inner wall of the stock bin 4 and ensuring good emptying effect. Moreover, after the stock bin 4 is inflated, the material becomes loose, facilitating flow; A fixing ring 96 is coaxially sleeved on the connecting pipe 92. The fixing ring 96 is located between the locking ring 94 and the fluidizing disc 91. A plurality of elastic rods 97 are arranged in the fluidizing disc 91. The plurality of elastic rods 97 are uniformly distributed in the circumferential direction with the connecting pipe 92 as the center. One end of each elastic rod 97 is fixedly arranged on the inner wall of the fluidizing disc 91. The other end of each elastic rod 97 is clamped with the fixing ring 96; One end of the fixed ring 96 is provided with an annular groove 98, and one end of the elastic rod 97 is provided with a protrusion 99 which is inserted into the annular groove 99; When the fluidizing disc 91 is deformed due to air charging, the elastic rod 97 is stretched, and when the connecting pipe 92 stops air charging, the fluidizing disc 91 is reset by the elastic effect of the fluidizing disc 91 itself and the elastic effect of the elastic rod 97, so that the fluidizing disc 91 cannot be completely reset after fatigue damage, the fluidizing disc 91 is tightly sealed with the inner wall of the material bin 4 when air charging is stopped, the sealing between the fluidizing disc 91 and the inner wall of the material bin 4 is ensured, and material leakage is prevented; The induction material level meter 7 is a radio frequency admittance material level controller, which is based on radio frequency capacitor technology: radio frequency is applied to the probe, and the surrounding environment is continuously analyzed, and when the probe contacts the medium, the change of the small capacitor halo caused by the fact that the dielectric constant and conductivity of all media are different from those of air is detected by the circuit and converted into a switching signal output. The unique anti-adhesion circuit only reacts to the change of the capacitor halo caused by the change of the material level, and eliminates false signals caused by material accumulation; The PET granular material is light in specific gravity, and the tuning fork material level meter and the resistance spin material level meter cannot accurately measure the PET granular material due to the too light specific gravity of the PET granular material, and the resistance spin cannot guarantee to meet the requirement that the increase of dust magnetic foreign matter is less than or equal to 10 PCS / kg, so that the project adopts the radio frequency admittance material level meter The pneumatic conveying pipeline 3 is divided into three independent channels corresponding to the conveying requirements of black, white and bright white materials, each channel is provided with a special air power unit, i.e. a fan 6, to maintain stable conveying pressure and flow, and the end of each channel is provided with a flow divider valve for distributing the material to the corresponding material bin 4, and the flow divider valve is controlled by an electric actuator and can flexibly adjust the material flow direction according to actual production requirements.

[0028] The PLC controller adopts a Siemens S7-1200 series controller with touch screen display function, the control system is connected with the induction material level meter 7, the discharger 5, the air shut-off and gas return automatic control valve and other components through data lines, and centralized management of the whole system is realized, in the automatic mode, the system can automatically complete the tasks of material feeding, storage, distribution and conveying according to the preset program, and in the manual mode, the operator can control the actions of each component through the touch screen interface.

[0029] The dust remover 1 and the vibrating screen 2 ensure the cleanliness of the material, the pneumatic conveying pipeline 3 and the material bin 4 provide a stable conveying and storage environment, and the fan 6 and the PLC control system provide reliable power support and intelligent management for the whole system. In summary, the whole process automation from feeding to storage to dosing delivery is realized, the continuity and stability of material delivery are significantly improved, the labor intensity is reduced, and the work efficiency is improved.

[0030] In addition to the above-mentioned embodiments, the present application also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the present application.

Claims

1. An automated raw material conveying system, characterized in that: The system includes a dust collector (1), a vibrating screen (2), a pneumatic conveying pipeline (3), a silo (4), and a PLC controller. Multiple silos (4) are provided. One end of the pneumatic conveying pipeline (3) is connected to the output end of the vibrating screen (2), and the other end of the pneumatic conveying pipeline (3) is connected to each silo (4) through a discharger (5). A fan (6) is connected to the pneumatic conveying pipeline (3). The dust collector (1) is connected to each silo (4), and each silo (4) is equipped with a sensor level gauge (7). Both the fan (6) and the sensor level gauge (7) are connected to the PLC controller.

2. The automated raw material conveying system according to claim 1, characterized in that: There are three sensor level gauges (7) in the same silo (4), and the three sensor level gauges (7) in the same silo (4) are distributed from top to bottom.

3. The automated raw material conveying system according to claim 1, characterized in that: The pneumatic conveying pipeline (3) is divided into three independent channels, which correspond to the conveying needs of black, white and bright white materials respectively.

4. The automated raw material conveying system according to claim 3, characterized in that: The silos (4) consist of a total of 45 silos, divided into three groups of 15 each, which are used to store materials of three colors: black, white and off-white.

5. The automated raw material conveying system according to claim 1, characterized in that: The volume of the silo (4) is 200 cubic meters. Each silo (4) stores 80 tons of material based on an average bulk density of 0.

4. The total storage capacity is 3600 tons. The silo (4) is located in a space that is 60 meters long, 12 meters wide, and 22.8 meters high.

6. The automated raw material conveying system according to claim 1, characterized in that: The filter cartridge of the dust collector (1) is a membrane filter bag with a filtration accuracy of 0.02um.

7. The automated raw material conveying system according to claim 1, characterized in that: The bottom of the silo (4) is connected to a bulk fluidizer (9), which is connected to an external air source through an air supply pipeline.

8. The automated raw material conveying system according to claim 7, characterized in that: The bulk fluidizer (9) includes a fluidizing disc (91), a connecting pipe (92), and a mounting base (93). The mounting base (93) is fixedly disposed at one end of the connecting pipe (92). The fluidizing disc (91) is fixedly sleeved on the mounting base (93). The fluidizing disc (91) is conical. The large diameter end of the fluidizing disc (91) is arranged towards the connecting pipe (92). A locking ring (94) is coaxially and detachably fixedly sleeved on the connecting pipe (92). The connecting pipe (92) is connected to an air source. An air hole (95) is provided on the mounting base (93). The cavity inside the connecting pipe (92) is connected to the cavity inside the fluidizing disc (91) through the air hole (95). The fluidizing disc (91) is elastic.

9. The automated raw material conveying system according to claim 8, characterized in that: One end of the fixed ring (96) is provided with an annular groove (98), and one end of the elastic rod (97) is provided with a protrusion (99), which is inserted into the annular groove (98).

10. The automated raw material conveying system according to claim 1, characterized in that: The material discharge end of the hopper (4) is automatically discharged through an automatic air-return control valve.

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