CN115231319A - Environment-friendly conveying equipment for pneumatic conveying and negative-pressure dust extraction of ultrafine powder and conveying method thereof - Google Patents
Environment-friendly conveying equipment for pneumatic conveying and negative-pressure dust extraction of ultrafine powder and conveying method thereof Download PDFInfo
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- CN115231319A CN115231319A CN202210923258.3A CN202210923258A CN115231319A CN 115231319 A CN115231319 A CN 115231319A CN 202210923258 A CN202210923258 A CN 202210923258A CN 115231319 A CN115231319 A CN 115231319A
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- 239000000428 dust Substances 0.000 title claims abstract description 85
- 238000000605 extraction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims description 90
- 239000002994 raw material Substances 0.000 claims description 42
- 238000003860 storage Methods 0.000 claims description 41
- 238000005303 weighing Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 8
- 239000012071 phase Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
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- 206010033799 Paralysis Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000013072 incoming material Substances 0.000 description 2
- 210000003437 trachea Anatomy 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 238000007664 blowing Methods 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/48—Screws or like rotary conveyors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/50—Pneumatic devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
- B65G69/18—Preventing escape of dust
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
Abstract
The invention provides an environment-friendly conveying device for pneumatic conveying of ultrafine powder and negative-pressure dust extraction and a conveying method thereof.
Description
Technical Field
The invention relates to the field of superfine powdery material concentrated phase conveying, in particular to an environment-friendly conveying device for pneumatic conveying of superfine powdery materials and negative pressure dust extraction and a conveying method thereof.
Background
In the chemical production process, in the industry and field of taking powdery materials as products, the powdery materials are usually conveyed pneumatically by adopting a bucket elevator, a scraper conveyor and negative pressure pumping or compressed air, and if the two are conveyed by mechanical chain belts, the defects of low efficiency, serious material return, high equipment failure rate, serious leakage at a dynamic seal position, poor field environment and the like are overcome; in the latter, the negative pressure conveying and conveying distance is short, the height is low, the material blockage is serious, particularly ultrafine powder with small particle size is obtained, and the pipeline blockage rate is high; the prior common concentrated phase pneumatic conveying mode with high solid-gas ratio has the advantages of long conveying distance and low power consumption, so the pneumatic conveying mode is widely applied to conveying powdery materials. The existing dense phase conveying is pneumatic conveying in a positive pressure environment, a connecting part often exists when powder materials enter another device from a bin, the blockage of a conveying system often occurs, and quick connectors or flanges are adopted for pipelines and device connecting pieces of most low-pressure systems so as to be convenient to disassemble and clean; or install weighing system, use connecting pieces such as flexible coupling, these places are easy leakage point, and in malleation system environment, the superfine powder is very easily leaked to scatter at the operation environment, lead to operation environment dust pollution. Meanwhile, the powder comes from various different environments, and when the powder enters a pneumatic conveying system, the powder is crushed, but the powder is also agglomerated or blocky after moisture absorption, and the powder is easy to block when directly entering a conveying pipeline, so that the conveying system is paralyzed.
Disclosure of Invention
The invention mainly aims to provide environment-friendly conveying equipment for pneumatic conveying of ultrafine powder and negative pressure dust extraction and a conveying method thereof, which solve the problem that when powder enters a pneumatic conveying system, the powder is crushed, but the powder is likely to be agglomerated or blocky after moisture absorption and is easily blocked when directly entering a conveying pipeline, so that the conveying system is easily paralyzed.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an environment-friendly conveying device for pneumatic conveying of ultrafine powder and negative-pressure dust extraction is characterized in that a buffer bin is communicated with an ultrafine powder machine, an outlet of the ultrafine powder machine is communicated with an inlet of a bag-type dust remover, a discharge port below the bag-type dust remover is communicated with a raw material bin through a screw conveyor, a positive-pressure conveying bin is communicated below the raw material bin, the positive-pressure conveying bin is communicated with a material receiving bin, a bin top dust remover above the material receiving bin is communicated with the inlet of the bag-type dust remover, and the whole system forms a negative-pressure environment;
the superfine powder is buffered in a raw material bin and then enters a positive pressure conveying bin to form concentrated phase pneumatic conveying, and the superfine powder is conveyed to a material receiving bin.
In the preferred scheme, an air storage tank and a surface air storage tank are also arranged, and the surface air storage tank is communicated with a pneumatic instrument;
the air storage tank is communicated with the positive pressure conveying bin air inlet and the discharge pipeline through a pipeline, and the air storage tank is communicated with the positive pressure conveying bin air inlet through a ninth manual ball valve, a first pressure reducing valve, a fourth pneumatic valve and a pressure transmitter.
In a preferred scheme, a second air hammer device is further arranged on the positive-pressure conveying bin, and the air storage tank is communicated with the second air hammer device through a second electromagnetic valve;
the air storage tank is respectively communicated with the ninth manual ball valve and the second electromagnetic valve through a seventh manual ball valve.
In the preferred scheme, the air storage tank is communicated with a three-way pipeline of a discharge port of the positive pressure conveying bin through an eighth manual ball valve, a second pressure reducing valve, a pulse valve and a sixth pneumatic valve, a fifth pneumatic valve is arranged between the positive pressure conveying bin and the three-way pipeline, and the three-way pipeline is communicated with the material receiving bin.
In the preferred scheme, a second high-level material level meter is further arranged on one side of the positive pressure conveying bin, the positive pressure conveying bin is arranged on the weighing system, and a mechanical pressure gauge is further arranged above the positive pressure conveying bin.
In the preferred scheme, be equipped with second pneumatic valve and third pneumatic valve on the pipeline between malleation transport bin and the former feed bin, soft connection between second pneumatic valve and the third pneumatic valve, malleation transport bin one side still communicates through seventh pneumatic valve and former feed bin top, and the last parallel connection of seventh pneumatic valve has tenth manual ball valve, seventh pneumatic valve and former feed bin top soft connection.
In the preferred scheme, a first air hammer device is arranged on one side of the raw material bin and is communicated with an air storage tank through a first electromagnetic valve;
still be equipped with first high-order charge level indicator on the former feed bin, former feed bin and screw conveyer pass through first pneumatic valve intercommunication.
In the preferred scheme, the surge bin communicates with the submicron powder machine through first manual butterfly valve and gyration discharge valve, is equipped with between first manual butterfly valve and the gyration discharge valve and connects the big trachea, connects to be equipped with the manual butterfly valve of second on the big trachea.
In the preferred scheme, a third high-level material level meter is arranged above the material receiving bin, an air inlet of a bin top dust remover above the material receiving bin is rolled with an air storage tank, and a third manual butterfly valve is arranged between an air outlet of the material receiving bin and a bag-type dust remover;
the air storage tank is communicated with an air inlet of the bag-type dust collector, and one side of the bag-type dust collector is communicated with the induced draft fan.
The method comprises the following steps:
s1, feeding powder into a buffer bin for buffering and temporary storage, feeding the powder into an ultrafine powder machine through a first manual butterfly valve and a rotary discharge valve, adjusting the feeding amount by controlling the rotating speed of the rotary discharge valve, and setting the chain rotary discharge valve to stop after the ultrafine powder machine is stopped;
the second manual butterfly valve controls the blanking pipe to be connected with the atmosphere, the whole dust extraction system is in a negative pressure state, blanking blockage is avoided, the opening degree of the second manual butterfly valve can be manually adjusted, air inlet amount is controlled, and uniform and smooth blanking is guaranteed;
s2, after the powder is ground again by the ultra-micro powder machine, the particle sizes of small blocks and the original fine powder are smaller, the powder and the air powder are sucked into a bag-type dust collector along with air through a negative pressure pipeline, the powder and the air powder fall down and are conveyed into a raw material bin through a screw conveyer, a first pneumatic valve is interlocked with the screw conveyer, when the first pneumatic valve is opened, the screw conveyer can be started, and simultaneously, a first high-level material level meter of the raw material bin is interlocked with the first pneumatic valve, when the material level of the raw material bin is high, the first pneumatic valve is interlocked to be closed, and simultaneously, the screw conveyer is stopped;
s3, opening a seventh pneumatic valve, after discharging air in the positive-pressure conveying bin, opening the third pneumatic valve for 2-4S, then opening a second pneumatic valve, simultaneously starting vibration of the first air hammer device, enabling powder to enter the positive-pressure conveying bin through a valve, a pipeline and a flexible connection, and enabling the raw material bin, the positive-pressure conveying bin, the screw conveyor, the bag-type dust collector and the draught fan to form a negative-pressure environment, so that all the powder cannot be leaked;
s4, controlling feeding time of the positive pressure conveying bin through a time relay, and controlling feeding amount by interlocking with a second high-level material level meter, a weighing system, a third pneumatic valve and a second pneumatic valve of the positive pressure conveying bin, namely when the feeding time reaches or the second high-level material level meter and the weighing system output signals simultaneously, namely the feeding time reaches, or materials in the bin reach the position of the high-level material level meter and a numerical value which is required to be reached by the weight of the materials at the moment is set according to the position of the installed high-level material level meter, and closing the third pneumatic valve to stop feeding of the positive pressure conveying bin after 2-4S of linkage control of double conditions is performed;
s5, manually adjusting the outlet pressure of the first reducing valve and the outlet pressure of the second reducing valve, controlling the outlet pressure of the first reducing valve to be 110-130KPa, controlling the outlet pressure of the second reducing valve to be 250-350KPa, setting a positive pressure conveying bin pressure maintaining finger to be 70-90KPa, and interlocking the positive pressure conveying bin pressure detection value by controlling the opening and closing of a fourth pneumatic valve to maintain the pressure of the positive pressure conveying bin;
s6, closing the seventh pneumatic valve to enable the positive pressure conveying bin to be in a closed environment, starting the fourth pneumatic valve to punch the positive pressure conveying bin, and closing the fourth pneumatic valve until a set value is reached;
after the pulse valve is opened for 2-4S, the sixth pneumatic valve is opened, compressed air enters the pulse valve after being decompressed, the compressed air is subjected to time pulse set by the pulse valve to control the air inlet time of the compressed air, so that the time interval of the compressed air entering the material conveying pipe is controlled, the fifth pneumatic valve is opened, the second air hammer device is interlocked to start to act after 2-4S, powder is extruded into the three-way pipeline and the material conveying pipe due to the pressure in the positive pressure conveying bin, the powder is conveyed to a low pressure area by an air column formed by the high-pressure compressed air, the second pneumatic valve and the seventh pneumatic valve are disconnected from the negative pressure environment of the induced draft fan due to the closing of the positive pressure conveying bin, the pressure is slightly reduced due to the output of the powder, but the interlocking of the fourth pneumatic valve and the pressure set value in the bin ensures that the pressure in the bin is maintained at a set value of 80KPa, the material receiving bin is connected with the induced draft fan to be in a micro-negative pressure environment, so that the material behind the three-way pipeline is pressed into the receiving bin due to the high-pressure compressed air entering the pulse valve, and when the pulse valve is closed, the pulse valve, the powder is extruded out, so that the continuous conveying is completed until the powder is conveyed completely;
s7, after the powder in the positive pressure conveying bin is conveyed, the pressure continues to be reduced, when the pressure is reduced to be less than 25KPa, the weight of a heavy chain system is less than or equal to a set weight, the powder conveying is judged to be finished when two conditions are met simultaneously, the fourth pneumatic valve is closed after 2-4S, the sixth pneumatic valve is closed after the fifth pneumatic valve is closed and opened for 2 times, the pulse valve is closed after 1S, the five pneumatic valves are closed, the step S3 is repeated, and circulation is performed;
s8, conveying the powder to a receiving bin, discharging air along with a bin top dust remover and then feeding the air into a bag-type dust remover, collecting a small amount of untreated powder to be changed into a product, and enabling a conveying and receiving system to be in a negative pressure environment, so that no leakage and dust raising exist in a use site, and the environment of site environment protection can be guaranteed.
The invention provides an environment-friendly conveying device for pneumatic conveying of ultrafine powder and negative-pressure dust extraction and a conveying method thereof. According to the invention, the superfine pulverizer is used for further pulverizing powder materials, so that the blockage of a conveying system caused by caking and large materials entering a conveying pipeline is prevented, meanwhile, the whole system forms a negative pressure environment through the draught fan and the bag-type dust remover, namely, the positive pressure conveying effect is achieved, and the defects of dust leakage, large dust emission and poor field environment caused by the positive pressure environment in the positive pressure conveying process are overcome.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a diagram of the overall delivery system of the present invention;
FIG. 2 is a schematic view of the positive pressure feed bin to stock bin connection system of the present invention;
FIG. 3 is a diagram of the positive pressure feed bin system of the present invention;
FIG. 4 is a diagram of a surge bin feed material system of the present invention;
FIG. 5 is a diagram of a system for connecting a collecting bin and a bag-type dust collector according to the present invention.
In the figure: a surge bin 1; a first manual butterfly valve 101; a second manual butterfly valve 102; a rotary discharge valve 103; an ultrafine pulverizer 2; a bag-type dust collector 3; a draught fan 4; a screw conveyor 5; a raw material bin 6; a first pneumatic valve 601; a first high level gauge 602; a first air hammer device 603; a first solenoid valve 604; a second pneumatic valve 605; a third pneumatic valve 606; a positive pressure conveying bin 7; a pressure transmitter 701; a fourth pneumatic valve 702; a first pressure reducing valve 703; a ninth manual ball valve 704; a seventh manual ball valve 705; a second solenoid valve 706; a second air hammer device 707; a seventh pneumatic valve 708; a tenth manual ball valve 709; a weighing system 710; a fifth pneumatic valve 711; a tee pipe 712; a sixth pneumatic valve 713; a pulse valve 714; an eighth manual ball valve 715; a second high level gauge 716; a second pressure reducing valve 717; an air reservoir 8; a receiving bin 9; a third high level gauge 901; a third high level gauge 602; a bin top dust remover 10; a third manual butterfly valve 1001; and a meter air storage tank 11.
Detailed Description
Example 1
As shown in fig. 1 to 5, an environment-friendly conveying device for pneumatic conveying negative-pressure dust pumping of ultrafine powder, a buffer bin 1 is communicated with an ultrafine powder machine 2, an outlet of the ultrafine powder machine 2 is communicated with an inlet of a bag-type dust remover 3, a discharge port below the bag-type dust remover 3 is communicated with a raw material bin 6 through a screw conveyor 5, a discharge port below the raw material bin 6 is communicated with a positive-pressure conveying bin 7, the positive-pressure conveying bin 7 is communicated with a material receiving bin 9, a bin top dust remover 10 above the material receiving bin 9 is communicated with an inlet of the bag-type dust remover 3, the whole system forms a negative-pressure environment, ultrafine powder enters the positive-pressure conveying bin 7 after being buffered by the raw material bin 6 to form dense-phase pneumatic conveying, and the ultrafine powder is conveyed to the material receiving bin 9. Dress powdery material's buffering feed bin 1, through pipe connection superfine pulverizer 2, powder after preliminary breakage gets into superfine pulverizer and smashes, the export is through pipe connection to 3 entrys of sack cleaner, the sack cleaner export is through pipe connection draught fan 4, superfine powder gets into sack cleaner 3 at negative pressure system, collect through the sack, fall after the blowback, carry to former feed bin 6 through bolt conveyer 5, get into malleation transport bin 7 after 6 cushions in former feed bin, form dense phase air conveying, carry superfine powder to receiving feed bin 9, gaseous phase is handled the back through storehouse top dust remover 10 and is passed through pipe connection to 3 air inlets of sack cleaner, make entire system form negative pressure environment, pneumatic valve provides instrument gas buffer tank 11 through instrument gas buffer tank.
In the preferred scheme, an air storage tank 8 and a meter air storage tank 11 are further arranged, the meter air storage tank 11 is communicated with a pneumatic instrument, the air storage tank 8 is communicated with an air inlet and a discharge pipeline of the positive pressure conveying bin 7 through a pipeline, and the air storage tank 8 is communicated with the air inlet of the positive pressure conveying bin 7 through a ninth manual ball valve 704, a first pressure reducing valve 703, a fourth pneumatic valve 702 and a pressure transmitter 701. Instrument air and compressed air for conveying are temporarily stored in the instrument air storage tank 11 and the air storage tank 8 respectively and are derived from different compressed air pipelines, and the pneumatic valve action is prevented from being influenced by large air consumption during conveying.
Example 2
Further explained with reference to embodiment 1, as shown in fig. 1-5, the positive pressure conveying bin 7 is further provided with a second air hammer device 707, and the air storage tank 8 is communicated with the second air hammer device 707 through a second electromagnetic valve 706; the air storage tank 8 is respectively communicated with a ninth manual ball valve 704 and a second electromagnetic valve 706 through a seventh manual ball valve 705.
The air storage tank 8 is communicated with a three-way pipeline 712 at the discharge port of the positive pressure conveying bin 7 through an eighth manual ball valve 715, a second reducing valve 717, a pulse valve 714 and a sixth pneumatic valve 713, a fifth pneumatic valve 711 is arranged between the positive pressure conveying bin 7 and the three-way pipeline 712, and the three-way pipeline 712 is communicated with the material receiving bin 9.
In the preferred scheme, a second high-level gauge 716 is further arranged on one side of the positive pressure conveying bin 7, the positive pressure conveying bin 7 is arranged on the weighing system 710, and a mechanical pressure gauge is further arranged above the positive pressure conveying bin 7.
In the preferred scheme, a second pneumatic valve 605 and a third pneumatic valve 606 are arranged on a conveying pipeline between the positive pressure conveying bin 7 and the raw material bin 6, the second pneumatic valve 605 and the third pneumatic valve 606 are in flexible connection, one side of the positive pressure conveying bin 7 is communicated with the top of the raw material bin 6 through a seventh pneumatic valve 708, a tenth manual ball valve 709 is connected to the seventh pneumatic valve 708 in parallel, and the seventh pneumatic valve 708 is in flexible connection with the top of the raw material bin 6.
The positive pressure conveying bin 7 is provided with a pressure transmitter 701, a weighing system 710, a second high-level indicator 716, a second air hammer device 707 and a mechanical pressure gauge, and a feeding hole is connected with the raw material bin 6 through a third pneumatic valve 606, a second pneumatic valve 605 and a flexible connector and is used for feeding materials; the discharge port is in flexible connection through a fifth pneumatic valve 711 and is connected with a receiving bin 9 through a conveying pipe for conveying powder; the delivery pipe at the discharge port is connected with high-pressure compressed air through a three-way pipeline 712, a flexible connection, a sixth pneumatic valve 713, a pulse valve 714, a second pressure reducing valve 717, a filter and an eighth manual ball valve 715, and is used for controlling the intermittent delivery process.
Compressed air in the positive pressure conveying bin 7 is controlled through a ninth manual ball valve 704, a filter, a first pressure reducing valve 703 and a fourth pneumatic valve 702, the pressure in the bin is monitored through a pressure transmitter 701, the linkage pneumatic valve 9 is opened and closed, and a seventh pneumatic valve 708 is a hand valve for air inlet of the positive pressure conveying bin 7 and general opening and closing of the air hammer device 2.
The air hammer device 2 arranged on the positive pressure conveying bin 7 controls the air inlet and outlet of the instrument through the electromagnetic valve 2, thereby controlling the action of the air hammer.
The positive pressure conveying bin 7 is emptied, and is connected with the raw material bin 6 through a second air hammer device 707 and a tenth manual ball valve 709 through flexible connection and a pipeline, so as to ensure that the pressures in the positive pressure conveying bin 7 and the raw material bin 6 are consistent.
The discharge of the positive pressure conveying bin 7 is communicated with compressed air through a fifth pneumatic valve 711, a three-way pipeline 712, a flexible connection, a material conveying pipeline, a pneumatic valve 6, a pulse valve 714, a second reducing valve 717, a filter and an eighth manual ball valve 715 for controlling material conveying.
In a preferable scheme, a first air hammer device 603 is arranged on one side of the raw material bin 6, and the first air hammer device 603 is communicated with an air storage tank 8 through a first electromagnetic valve 604;
a first high-level indicator 602 is further arranged on the raw material bin 6, and the raw material bin 6 is communicated with the screw conveyer 5 through a first pneumatic valve 601.
In the preferred scheme, surge bin 1 is through first manual butterfly valve 101 and gyration discharge valve 103 and 2 intercommunications of submicron powder machine, is equipped with between first manual butterfly valve 101 and the gyration discharge valve 103 and connects the atmosphere pipe, connects to be equipped with the manual butterfly valve 102 of second on the atmosphere pipe.
In the preferred scheme, a third high-level charge level indicator 901 is arranged above a material receiving bin 9, an air inlet of a bin top dust remover 10 above the material receiving bin 9 is rolled with an air storage tank 8, and a third manual butterfly valve 1001 is arranged between an air outlet of the material receiving bin 9 and a bag-type dust remover 3;
the air storage tank 8 is communicated with an air inlet of the bag-type dust collector 3, and one side of the bag-type dust collector 3 is communicated with the draught fan 4.
The raw material bin 6 is provided with a first high-level material level meter 602, a first air hammer device 603, a first air valve 601 and a second air valve 605, wherein the first air hammer device 603 controls the air inlet and outlet of the instrument through an electromagnetic valve, so as to control the air hammer action, the first air valve 601 is used for controlling the material inlet and the connection of the screw conveyor 5, and the second air valve 605 is used for controlling the material outlet and the connection of the positive pressure conveying bin 7.
Surge bin 1 is connected in super little rubbing crusher 2 through first manual butterfly valve 101 through material pipe, gyration discharge valve 103, and it has the inlet port to open on the material pipe, connects the atmosphere through second manual butterfly valve 102.
The bin top dust remover 10 is arranged on the receiving bin 9 and used for discharging air brought by materials and reserving powder, the bin top dust remover 10 is connected with an inlet pipe of the bag-type dust remover 3 through a manual butterfly valve 3 gas-phase negative pressure pipeline, and a manual ball valve 12 is used for controlling the bin top dust remover 10 to blow back and compress air to be opened and closed.
Example 3
Further explaining by combining with the embodiment 1-2, as shown in the structure of fig. 1-5, the powder enters the buffer bin 1 for buffering and temporary storage, then enters the ultrafine pulverizer 2 through the first manual butterfly valve 101 and the rotary discharge valve 103, the feeding amount is adjusted by controlling the rotating speed of the rotary discharge valve 103, and meanwhile, the chain rotary discharge valve is set to stop after the ultrafine pulverizer 2 stops.
The second manual butterfly valve 102 controls the blanking pipe to be connected with the atmosphere, the whole dust pumping system is in a negative pressure state, blanking blockage is avoided, the opening degree of the second manual butterfly valve 102 can be manually adjusted, air inlet amount is controlled, and uniform and smooth blanking is guaranteed.
The powder is ground again through superfine grinder 2, make the fritter form thing and former fine powder particle diameter littleer, in negative pressure pipeline along with the air suction sack cleaner 3, behind powder and air powder, fall down and carry to raw materials storehouse 6 through screw conveyer 5, first pneumatic valve 601 and screw conveyer 5 are chain, when first pneumatic valve 601 opens, screw conveyer 5 just can start, it is chain with first pneumatic valve 601 with the first high-order charge level indicator 602 in raw materials storehouse 6 simultaneously, chain first pneumatic valve 601 closes when 6 material levels in raw materials storehouse are high, screw conveyer 5 stops simultaneously.
The seventh pneumatic valve 708 is opened, after the air in the positive pressure conveying bin 7 is discharged, the third pneumatic valve 6062-4S is opened, then the second pneumatic valve 605 is opened, meanwhile, the first air hammer device 603 starts to vibrate, powder enters the positive pressure conveying bin 7 through a valve, a pipeline and a flexible connection, the raw material bin 6, the positive pressure conveying bin 7, the screw conveyer 5, the bag-type dust collector 3 and the draught fan 4 form a negative pressure environment, and all the powder cannot be leaked.
Through the feeding time of time relay control malleation transport bin 7, simultaneously with malleation transport bin 7 second high level charge level indicator 716, weighing system 710, third pneumatic valve 606, second pneumatic valve 605 interlocking, control feeding volume, when the feeding time reachs or second high level charge level indicator 716 and weighing system 710 simultaneous output signal promptly, feeding time reaches promptly, or the interior material of storehouse reaches high level indicator position and sets up the numerical value that this moment material weight should reach according to the high charge level indicator position of installation, close third pneumatic valve 606 and stop malleation transport bin 7 feeding after dual condition interlocking control closes second pneumatic valve 6052-4S.
The outlet pressure of the first reducing valve 703 and the outlet pressure of the second reducing valve 717 are manually adjusted, the outlet pressure of the first reducing valve 703 is controlled to be 110-130KPa, the outlet pressure of the second reducing valve 717 is controlled to be 250-350KPa, a pressure maintaining finger of the positive pressure conveying cabin 7 is set to be 70-90KPa, and the pressure of the positive pressure conveying cabin 7 is maintained by controlling the opening and closing of the fourth pneumatic valve 702 and interlocking the pressure detection value of the positive pressure conveying cabin 7.
The seventh pneumatic valve 708 is closed to enable the positive pressure conveying bin 7 to be in a sealed environment, the fourth pneumatic valve 702 is opened to punch the inside of the positive pressure conveying bin 7, and the fourth pneumatic valve 702 is closed after the set value is reached.
After the pulse valve 7142-4S is opened, the sixth pneumatic valve 713 is opened, compressed air enters the pulse valve 714 after being decompressed, the air inlet time of the compressed air is controlled through time pulse set by the pulse valve 714, the time interval of the compressed air entering a conveying pipe is controlled, the fifth pneumatic valve 711 is opened, the fifth pneumatic valve 711 and the fifth pneumatic valve 4S are interlocked to start to operate, powder is extruded into the three-way pipeline 712 and the conveying pipe due to the pressure in the positive pressure conveying bin 7, high-pressure compressed air forms an air column to convey the powder to a low-pressure area, the second pneumatic valve 605 and the seventh pneumatic valve 708 are closed in the positive pressure conveying bin 7 to be disconnected with the negative pressure environment of the induced draft fan 4, the pressure is slightly reduced due to the output of the powder, but the interlocking of the fourth pneumatic valve 702 and the set value of the pressure in the bin ensures that the pressure in the bin is maintained at 80KPa, the receiving bin 9 is connected with the induced draft fan 4 to be in a micro negative pressure environment, and therefore the material is pressed into the receiving bin 9 due to be continuously conveyed until the pressure in the high-pressure air entering the pulse valve 714 is completely.
After the powder in the positive pressure conveying bin 7 is conveyed, the pressure is continuously reduced, when the pressure is reduced to be less than 25KPa, the weight of the interlocking heavy system is less than or equal to the set weight, when the two conditions are simultaneously met, the powder conveying is judged to be finished, the fourth pneumatic valve 702 is closed after 2-4S, the fifth pneumatic valve 7112 times is closed and opened, the sixth pneumatic valve 713 is closed, the pulse valve 714 is closed after 1S, the fifth pneumatic valve 711 is closed, the step S3 is repeated, and the circulation is carried out.
The powder is conveyed to a material receiving bin 9, air is discharged along with a bin top dust remover 10 and then enters a bag-type dust remover 3, a small amount of untreated powder can be collected and changed into a product, a conveying and receiving system is in a negative pressure environment, no leakage and no dust raising exist in a use site, and the environment of site environmental protection can be guaranteed.
Example 4
Further explaining by combining with the embodiment 1, as shown in the structure shown in fig. 1-5, the powder is conveyed to the receiving bin 9, the air is discharged along with the bin top dust remover and then enters the bag-type dust remover 3, a small amount of untreated powder can be collected to be changed into a product, the conveying and receiving system is in a negative pressure environment, no leakage and dust emission exist in the use site, the environment of site environmental protection can be ensured, and the product collection rate can be increased.
The weighing system installed in the positive pressure conveying bin 7 is not only used for system linkage control, but also used for assisting operators in monitoring the actual condition of powder in the bin, and is more visually judged.
The relative pressure of the inlet air of the instrument air storage tank 11 is 0.5-0.8 MPa, the relative pressure of the inlet air of the air storage tank 8 is 0.5-0.8 MPa, and the instrument air and the compressed air are dry air which is subjected to oil removal and water removal.
The bag-type dust collector 3, the bin top dust collector 10 compress the air back-blowing pressure, the first reducing valve 703, the second reducing valve 717 import is the pressure of the air reservoir 8; the outlet pressure of the first pressure reducing valve 703 is set to 100-120 KPa to ensure that the pressure in the positive pressure conveying bin 7 can quickly reach a set value of 80KPa; the outlet pressure of the second pressure reducing valve 717 is set to 250 to 300KPa or other pressure values, and can be adjusted according to the density and the conveying height of the powder.
The storehouse 7 feed time is carried to the malleation sets up and to be determined according to product output, product bulk density, 7 volumes in storehouse are carried to the malleation, product output is about 4.5 tons/h, when bulk density is about 700kg/m to the powder, output is about 107L/min, according to input time 8min, whole feeding and transport time 10 minutes are accomplished in transport time 2min, then 1070L/time, the volume that storehouse 7 was carried to the malleation can be carried according to 1.5m arrangement of performing the sieve to the powder.
The negative pressure air quantity of the induced draft fan 4 can be selected according to the processing capacity of the bag-type dust collector 3; the static pressure can be determined according to the pressure drop of the ultrafine powder machine 2 and the bag-type dust collector 3, the resistance loss of a pipeline and the particle size of powder, and the negative pressure of the system is adjusted by selecting a variable frequency motor.
Wherein all pneumatic valves are pneumatic butterfly valves or other sealing surfaces are linear sealing valves, ball valves or other valve surface sealing valves cannot be adopted, ultrafine powder can be attached between the valve body and the sealing surfaces along with the opening and closing of the valve, the valve body and the sealing surfaces are mutually ground, and finally the valve is blocked and cannot act.
The invention adopts the buffer bin 1 to buffer and store the incoming materials, and adopts the rotary discharge valve before the incoming materials enter the superfine pulverizer, and the feeding amount is adjusted by controlling the rotating speed of the motor through frequency conversion.
The invention adopts the ultrafine grinder to grind the powder again, can adjust the particle size after grinding from 10 to 200 meshes according to the requirements, sucks the powder into the bag-type dust collector by matching with the negative pressure generated by the draught fan, collects the dust collected by the dust collector as the raw material, prevents the blocking of a pipeline caused by the fact that the caked powder or the small-block powder enters a conveying system, and simultaneously enables the system to be in a negative pressure environment in the process that the powder enters another device from one bin in the raw material bin 6, the buffer bin 1, the ultrafine powder machine 2, the bag-type dust collector 3 and the positive pressure conveying bin 7, thereby avoiding the problems of dust leakage and dust raising at the soft connection and other connection parts of the positive pressure system.
According to the invention, the first air hammer device 603 and the second air hammer device 707 are respectively arranged at the discharging positions of the raw material bin 6 and the positive pressure conveying bin 7, and the discharging pneumatic valve is started when being opened, so that residual powder on the inner wall of the bin can be effectively shaken off, and the phenomenon that the powder is adhered to the wall due to long-term material accumulation to form blocks to block the pipeline is avoided.
According to the invention, the outlet pipeline of the bin top dust remover 10 is connected into the bag-type dust remover 3, so that the receiving bin 9 is in a negative pressure environment, and the problems of dust leakage and poor field environment caused by positive pressure in the positive pressure conveying process are solved.
All pneumatic valves in contact with powder in the invention must adopt pneumatic butterfly valves with linear sealing surfaces as valve bodies and sealing surfaces, and strictly adopt ball valves with surface sealing surfaces as valve bodies, so that the risk of valve body jamming caused by grinding in the opening and closing processes due to attachment of fine powder on the surface of the valve body is avoided.
The invention adopts the blanking time relay to control the feeding time in an interlocking way, solves the defects of inaccurate metering and easy output of error signals of the material level meter caused by the phenomenon that powder materials are easy to adhere to and stick to the wall, simultaneously takes the material high level meter as an auxiliary interlocking device and is interlocked with the weighing system, solves the problems of valve blockage or material overflow caused by overlong blanking time and full bin body, and sets numerical values by combining the weighing system when the blanking time is not reached but the materials reach the high level to jointly serve as the condition for judging the closing of the second pneumatic valve 605 and the third pneumatic valve 606 to ensure that the positive pressure conveying bin is full of the materials.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. An environmental protection conveying equipment of dirt is taken out to superfine powder pneumatic conveying negative pressure, characterized by: the buffer bin (1) is communicated with the ultra-fine powder machine (2), the outlet of the ultra-fine powder machine (2) is communicated with the inlet of the bag-type dust remover (3), the discharge port below the bag-type dust remover (3) is communicated with the raw material bin (6) through the screw conveyor (5), the lower part of the raw material bin (6) is communicated with the positive pressure conveying bin (7), the positive pressure conveying bin (7) is communicated with the material receiving bin (9), the bin top dust remover (10) above the material receiving bin (9) is communicated with the inlet of the bag-type dust remover (3), and the whole system forms a negative pressure environment;
the superfine powder is buffered in a raw material bin (6) and then enters a positive pressure conveying bin (7) to form concentrated phase pneumatic conveying, and the superfine powder is conveyed to a material receiving bin (9).
2. The environment-friendly conveying equipment for pneumatic conveying negative-pressure dust extraction of ultrafine powder materials, as claimed in claim 1, is characterized in that: the pneumatic instrument is also provided with an air storage tank (8) and a meter air storage tank (11), wherein the meter air storage tank (11) is communicated with the pneumatic instrument;
the air storage tank (8) is communicated with an air inlet and a discharge pipeline of the positive pressure conveying bin (7) through a pipeline, and the air storage tank (8) is communicated with the air inlet of the positive pressure conveying bin (7) through a ninth manual ball valve (704), a first pressure reducing valve (703), a fourth pneumatic valve (702) and a pressure transmitter (701).
3. The environment-friendly conveying equipment for pneumatic conveying negative-pressure dust extraction of ultrafine powder materials, as claimed in claim 2, is characterized in that: a second air hammer device (707) is also arranged on the positive pressure conveying bin (7), and an air storage tank (8) is communicated with the second air hammer device (707) through a second electromagnetic valve (706);
the air storage tank (8) is respectively communicated with the ninth manual ball valve (704) and the second electromagnetic valve (706) through a seventh manual ball valve (705).
4. The environment-friendly conveying equipment for pneumatic conveying negative-pressure dust extraction of ultrafine powder materials, as claimed in claim 2, is characterized in that: the air storage tank (8) is communicated with a three-way pipeline (712) at the discharge hole of the positive pressure conveying bin (7) through an eighth manual ball valve (715), a second reducing valve (717), a pulse valve (714) and a sixth pneumatic valve (713), a fifth pneumatic valve (711) is arranged between the positive pressure conveying bin (7) and the three-way pipeline (712), and the three-way pipeline (712) is communicated with the material receiving bin (9).
5. The environment-friendly conveying equipment for pneumatic conveying and negative-pressure dust extraction of ultrafine powders, which is disclosed by claim 1, is characterized in that: a second high-level material level meter (716) is further arranged on one side of the positive pressure conveying bin (7), the positive pressure conveying bin (7) is arranged on the weighing system (710), and a mechanical pressure gauge is further arranged above the positive pressure conveying bin (7).
6. The environment-friendly conveying equipment for pneumatic conveying and negative-pressure dust extraction of ultrafine powders, which is disclosed by claim 1, is characterized in that: a second pneumatic valve (605) and a third pneumatic valve (606) are arranged on a conveying pipeline between the positive pressure conveying bin (7) and the raw material bin (6), the second pneumatic valve (605) and the third pneumatic valve (606) are in flexible connection, one side of the positive pressure conveying bin (7) is communicated with the top of the raw material bin (6) through a seventh pneumatic valve (708), a tenth manual ball valve (709) is connected in parallel on the seventh pneumatic valve (708), and the seventh pneumatic valve (708) is in flexible connection with the top of the raw material bin (6).
7. The environment-friendly conveying equipment for pneumatic conveying negative-pressure dust extraction of ultrafine powder materials, as claimed in claim 6, is characterized in that: a first air hammer device (603) is arranged on one side of the raw material bin (6), and the first air hammer device (603) is communicated with an air storage tank (8) through a first electromagnetic valve (604);
a first high-level material level meter (602) is further arranged on the raw material bin (6), and the raw material bin (6) is communicated with the screw conveyor (5) through a first pneumatic valve (601).
8. The environment-friendly conveying equipment for pneumatic conveying negative-pressure dust extraction of ultrafine powder materials, as claimed in claim 1, is characterized in that: the buffer bin (1) is communicated with the ultra-micro powder machine (2) through a first manual butterfly valve (101) and a rotary discharge valve (103), an atmosphere connecting pipe is arranged between the first manual butterfly valve (101) and the rotary discharge valve (103), and a second manual butterfly valve (102) is arranged on the atmosphere connecting pipe.
9. The environment-friendly conveying equipment for pneumatic conveying negative-pressure dust extraction of ultrafine powder materials, as claimed in claim 1, is characterized in that: a third high-level material level meter (901) is arranged above the material receiving bin (9), an air inlet of a bin top dust remover (10) above the material receiving bin (9) is rolled with an air storage tank (8), and a third manual butterfly valve (1001) is arranged between an air outlet of the material receiving bin (9) and the bag-type dust remover (3);
the air storage tank (8) is communicated with an air inlet of the bag-type dust collector (3), and one side of the bag-type dust collector (3) is communicated with the induced draft fan (4).
10. The method for conveying superfine powder materials by pneumatic conveying negative-pressure dust-extraction environment-friendly conveying equipment as claimed in any one of claims 1 to 9, which is characterized in that: the method comprises the following steps:
s1, feeding powder into a buffer bin (1) for buffering and temporary storage, feeding the powder into a superfine pulverizer (2) through a first manual butterfly valve (101) and a rotary discharge valve (103), adjusting the feeding amount by controlling the rotating speed of the rotary discharge valve (103), and simultaneously setting a chain rotary discharge valve to stop after the superfine pulverizer (2) is stopped;
the second manual butterfly valve (102) controls the blanking pipe to be connected with the atmosphere, the whole dust pumping system is in a negative pressure state, blanking blockage is avoided, the opening degree of the second manual butterfly valve (102) can be manually adjusted, the air inlet amount is controlled, and uniform and smooth blanking is guaranteed;
s2, after the powder is ground again by the ultra-micro powder machine (2), the particle sizes of small blocks and the raw fine powder are smaller, the powder is sucked into a bag-type dust collector (3) along with air through a negative pressure pipeline, the powder and the air powder fall down and are conveyed into a raw material bin (6) through a screw conveyor (5), a first pneumatic valve (601) is interlocked with the screw conveyor (5), when the first pneumatic valve (601) is opened, the screw conveyor (5) can be started, a first high-level material level meter (602) of the raw material bin (6) is interlocked with the first pneumatic valve (601), when the material level of the raw material bin (6) is high, the interlocked first pneumatic valve (601) is closed, and meanwhile, the screw conveyor (5) stops;
s3, opening a seventh pneumatic valve (708), after air in the positive-pressure conveying bin (7) is discharged, opening a third pneumatic valve (606) for 2-4S, then opening a second pneumatic valve (605), simultaneously starting vibration of a first air hammer device (603), enabling powder to enter the positive-pressure conveying bin (7) through a valve, a pipeline and a flexible connection, and enabling the raw material bin (6), the positive-pressure conveying bin (7), the spiral conveyor (5), the bag-type dust collector (3) and the induced draft fan (4) to form a negative-pressure environment, wherein all the powder cannot be leaked;
s4, controlling the feeding time of the positive pressure conveying bin (7) through a time relay, and simultaneously interlocking with a second high-level material level meter (716), a weighing system (710), a third pneumatic valve (606) and a second pneumatic valve (605) of the positive pressure conveying bin (7) to control the feeding amount, namely, when the feeding time reaches or the second high-level material level meter (716) and the weighing system (710) output signals simultaneously, namely, the feeding time reaches, or the materials in the bin reach the position of the high-level material level meter and a numerical value which the weight of the materials reaches at the moment is set according to the position of the installed high-level material level meter, and closing the third pneumatic valve (606) to stop feeding of the positive pressure conveying bin (7) after 2-4S of closing of the second pneumatic valve (605) under interlocking control of double conditions;
s5, manually adjusting the outlet pressure of the first pressure reducing valve (703) and the outlet pressure of the second pressure reducing valve (717), controlling the outlet pressure of the first pressure reducing valve (703) to be 110-130KPa and the outlet pressure of the second pressure reducing valve (717) to be 250-350KPa, setting a pressure maintaining finger of 70-90KPa of the positive pressure conveying bin (7), and interlocking the pressure detection value of the positive pressure conveying bin (7) by controlling the fourth pneumatic valve (702) to be opened and closed to maintain the pressure of the positive pressure conveying bin (7);
s6, closing the seventh pneumatic valve (708) to enable the positive pressure conveying bin (7) to be in a closed environment, opening the fourth pneumatic valve (702) to punch the inside of the positive pressure conveying bin (7), and closing the fourth pneumatic valve (702) after the preset value is reached;
after 2-4S of the pulse valve (714) is started, the sixth pneumatic valve (713) is started, compressed air enters the pulse valve (714) after being decompressed, the compressed air inlet time is controlled through time pulse set by the pulse valve (714), the time interval of the compressed air entering a material conveying pipe is controlled, the fifth pneumatic valve (711) is started, 2-4S later, the second air hammer device (707) is interlocked to start to act, powder is extruded into the three-way pipe (712) and the material conveying pipe due to the pressure in the positive pressure conveying bin (7), high-pressure compressed air forms an air column to convey the powder to a low-pressure area, the pressure in the positive pressure conveying bin (7) is kept at a set value of 80KPa due to the fact that the second pneumatic valve (605) and the seventh pneumatic valve (708) are closed and the negative pressure environment of the draught fan (4) is disconnected, the pressure is slightly reduced due to the output of the powder, but the interlocking of the fourth pneumatic valve (702) and the set value of the pressure ensures that the internal pressure of the positive pressure conveying bin is maintained at the 80KPa set value, the pressure in the receiving bin (9) is connected with the draught fan (4) in a micro-negative pressure environment, so that the material enters the high-pressure compressed air in the high-pressure air compressed air bin (714) after the three-way pipe (712) and the pulse valve (714), and the material conveying bin is continuously conveyed, and all the powder is extruded by the pulse valve (714), and the pulse conveying bin (714), and the powder conveying bin is closed, and the powder conveying bin is continuously conveyed, and the powder conveying bin is completed when all the powder conveying bin is conveyed;
s7, after the powder in the positive pressure conveying bin (7) is conveyed, the pressure continues to drop, when the pressure is reduced to be less than 25KPa, the weight of a heavy chain system is less than or equal to a set weight, the powder conveying can be judged to be finished when two conditions are met simultaneously, the fourth pneumatic valve (702) is closed after 2-4S, the sixth pneumatic valve (713) is closed after the fifth pneumatic valve (711) is closed and opened for 2 times, the pulse valve (714) is closed after 1S, the fifth pneumatic valve (711) is closed, the step S3 is repeated, and circulation is started;
s8, the powder is conveyed to a receiving bin (9), air is discharged along with a bin top dust remover (10) and then enters a bag-type dust remover (3), a small amount of untreated powder can be collected to be changed into a product, a conveying and receiving system is in a negative pressure environment, no leakage and no dust raising exist in a use site, and the environment of site environment protection can be guaranteed.
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