CN220802700U - Automatic proportioning and mixing system for various moisture-absorbing powder materials - Google Patents

Abstract

The utility model provides an automatic proportioning and mixing system for various moisture-absorbing powder materials, which comprises a plurality of raw material bins, wherein the tops of the raw material bins are connected with raw material bin top dust collectors, the exhaust ports of the raw material bin top dust collectors are connected with the inlet of an air blower through pipelines, the exhaust ports of the raw material bin top dust collectors are provided with exhaust pipes, the outlet of the air blower is connected with the raw material bins through pipelines, and an air storage tank is connected with the inlet of the air blower through pipelines. The discharge opening of the raw material bin is connected with the feed inlet of the positive pressure sending tank, the discharge opening of the positive pressure sending tank is connected with the feed inlet of the material metering bin through a pipeline, the material metering bin is connected with the air storage tank through a pipeline, and the top of the material metering bin is connected with the dust remover at the top of the metering bin. The discharge opening of the material metering bin is connected with the feed opening of the metering buffer bin through a pipeline, and the discharge opening of the metering buffer bin is connected with the feed opening of the mixer. The system can solve the problem of blockage in the process of conveying the moisture-absorbing powder.

Description

Automatic proportioning and mixing system for various moisture-absorbing powder materials

Technical Field

The utility model relates to the field of powder conveying easy to absorb moisture and adhesive, in particular to an automatic proportioning and mixing system for various powder easy to absorb moisture.

Background

In the industry and the field of conveying, metering and mixing various powdery materials as raw materials in the chemical production process, some raw materials are easy to absorb moisture, pipelines, equipment and the like are blocked due to moisture absorption in the storage, feeding, conveying and metering processes, manual feeding, material transferring, metering and the like are needed, the efficiency is low, the labor intensity is high, the risk of bringing foreign matters is high (particularly in the food and medicine grade field), and an automatic production line cannot be implemented; meanwhile, in the accurate powder metering process, only primary weighing metering is adopted, secondary weighing and comparison metering are not adopted, and the metering precision often cannot meet the use requirement.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an automatic proportioning and mixing system for various powder materials easy to absorb moisture so as to solve the problem of blockage in the conveying process of the powder materials easy to absorb moisture.

In order to solve the technical problems, the utility model adopts the following technical scheme: an automatic proportioning and mixing system for various moisture-absorbing powder materials comprises a plurality of raw material bins, wherein the tops of the raw material bins are connected with raw material bin top dust collectors, exhaust ports of the raw material bin top dust collectors are connected with inlets of air blowers corresponding to the raw material bins through pipelines, exhaust pipes are arranged at the exhaust ports of the raw material bin top dust collectors, first exhaust valves are arranged on the exhaust pipes, outlets of the air blowers are connected with the raw material bins through pipelines, air storage tanks are connected with inlets of the air blowers through pipelines, and first regulating valves are arranged on connecting pipelines of the air storage tanks and the air blowers;

The material outlet of the raw material bin is connected with the material inlet of the positive pressure sending tank, the material outlet of the raw material bin and the material inlet of the positive pressure sending tank are respectively provided with a first switch valve and a second switch valve, the positive pressure sending tank is connected with the air storage tank through a pipeline, and a second regulating valve is arranged on the pipeline connected with the positive pressure sending tank and the air storage tank;

The material outlet of the positive pressure sending tank is connected with the material inlet of the material metering bin through a pipeline, a ninth switching valve is arranged on the pipelines of the positive pressure sending tank and the material metering bin, the material metering bin is connected with the air storage tank through a pipeline, a third regulating valve is arranged on the pipeline connected with the material metering bin and the air storage tank, and the top of the material metering bin is connected with a dust remover at the top of the metering bin;

The material outlet of the material metering bin is connected with the material inlet of the metering buffer bin through a pipeline, the material outlet of the material metering bin is provided with a third switch valve, the material outlet of the metering buffer bin is connected with the material inlet of the mixer, and the material inlet of the mixer is provided with a fourth switch valve;

The raw material bin, the positive pressure sending tank, the metering buffer bin and the material metering bin are all provided with weighing metering devices.

In the preferred scheme, the air inlet of gas holder is connected the nitrogen pipe, and nitrogen gas in the nitrogen pipe comes from nitrogen making machine or former nitrogen gas holding vessel, and the air inlet of gas holder is equipped with the air inlet ooff valve, and the pipeline of nitrogen pipe is connected with first humidity on-line measuring appearance and desiccator, and first humidity on-line measuring appearance sets up the exit position at the desiccator, and the nitrogen pipe passes through the branch pipe to be connected with former nitrogen gas holding vessel, is equipped with the return air ooff valve on the branch pipe, and the branch pipe sets up the low reaches at first humidity on-line measuring appearance with the tracheal hookup location of nitrogen.

In the preferred scheme, a pipeline filter is arranged on a pipeline connected with the blower through the dust remover at the top of the raw material bin.

In the preferred scheme, the pipeline that the export of air-blower and former feed bin are connected is equipped with second humidity on-line measuring appearance.

In the preferred scheme, the powder tank truck comprises a plurality of powder tank trucks, and the powder tank trucks are connected with an outlet pipeline of a blower through a discharging butt joint pipeline; or the raw material bin is provided with a ton bag feeding port, the ton bag feeding port is provided with a fifth switch valve, and the ton bag feeding station feeds the raw material bin.

In the preferable scheme, the raw material bin is provided with a first pressure transmitter, and the first pressure transmitter is used for interlocking a first emptying valve and a first regulating valve to regulate pressure; the positive pressure sending tank is provided with a second pressure transmitter, the material metering bin is provided with a third pressure transmitter, the third pressure transmitter is linked with a third regulating valve to regulate pressure, a fourth pressure transmitter and an exhaust pipe are arranged on a pipeline, the exhaust port of the dust remover on the top of the raw material bin is connected with the air inlet of the blower, the exhaust pipe is provided with a sixth switching valve, and the fourth pressure transmitter is linked with the sixth switching valve to regulate pressure.

In the preferred scheme, be equipped with first communicating pipe between former feed bin and the malleation transmission jar, be equipped with the seventh switching valve on the first communicating pipe, be equipped with the second communicating pipe between material measurement storehouse and the measurement surge bin, be equipped with the eighth switching valve on the second communicating pipe.

In the preferred scheme, a star-shaped blanking device is arranged at a feeding port of the metering buffer bin.

In the preferred scheme, the bin outlet of measurement surge bin is connected with the bin outlet of blender through automatic interfacing apparatus, and automatic interfacing apparatus is equipped with the butt joint cylinder including setting up the support in measurement surge bin bottom on the support, and the bellows is connected to the bin outlet of measurement surge bin, and the bellows lower extreme is equipped with the butt joint pipe, and the flexible end and the butt joint union coupling of butt joint cylinder.

The automatic proportioning and mixing system for various moisture-absorbing powder materials provided by the utility model has the following beneficial effects:

1. the utility model carries out independent system conveying on various raw materials, and avoids inaccurate metering caused by system residues.

2. The utility model combines two modes of raw material unloading, conveying and storing, namely, circulating positive pressure air conveying and ton bag unloading stations, and unloading is carried out for different packages of raw materials.

3. The utility model adopts the positive pressure air supply system to remove dust from return air through the dust remover at the top of the raw material bin and the pipeline filter, and then recycles the return air, so that the whole conveying system is in closed circulation. The system pressure monitoring interlocking pneumatic regulating valve is subjected to external pressure supplementing through the pressure transmitter, the pressure of the system in the bin and the pressure of the whole pipeline system are maintained within the range of-5 to 3kpa, and compressed air serving as the supplementing pressure is also subjected to deep dehumidification treatment by the dryer and then is supplemented into the system, so that the humidity of closed circulation of the system is ensured to meet the requirement. Meanwhile, an online humidity detector is arranged at the outlet of the air blower of each raw material independent conveying system and is used for monitoring the water content in the air circulation system, and when the system humidity does not meet the requirement, the system can be subjected to emptying replacement and the compressed air with qualified moisture content is supplemented.

4. The utility model adopts independent metering and conveying before mixing various powder materials, and the whole system adopts a micro-positive pressure maintaining mode to isolate the external air, thereby ensuring the moisture content of the whole system and avoiding the adhesion, agglomeration and blockage of the powder materials due to moisture absorption.

5. According to the utility model, different precision metering weighing devices are arranged in a raw material bin, a positive pressure sending tank, a material metering bin and a metering buffer bin according to different weights of stored raw materials, such as: the raw material bin is of ton grade, the positive pressure sending tank is of 100 kg grade, and the material metering bin and the metering buffer bin are of gram grade. The materials can be synchronously measured in storage, transportation and measurement, and the real-time detection of the raw materials is realized.

6. The utility model adopts double metering contrast in the precise metering before the mixing of various powder materials, further improves the metering precision, the metering bin weighing device of the material metering bin weighs and meters the raw materials, the metering buffer bin is also provided with the weighing and metering device, and when the powder materials are metered, the metering bin weighing device of the material metering bin performs weight reduction metering on the powder materials, namely the weight reduction is the weight increase of the metering bin weighing device of the metering buffer bin, and the weight is more precise by comparing and averaging the two materials.

Drawings

The utility model is further described below with reference to the accompanying drawings and examples of implementation:

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic diagram of the connection of the air reservoir to the nitrogen pipe;

FIG. 3 is a schematic diagram showing the connection of the raw material bin and the blower

FIG. 4 is a schematic diagram of the connection of the metering surge bin to the material metering bin and the mixer;

FIG. 5 is a schematic view of the structure of the automatic docking device;

In the figure: the system comprises a raw material bin 1, a raw material bin top dust collector 2, a blower 3, an emptying pipe 4, a first emptying valve 5, a gas storage tank 6, a first regulating valve 7, a positive pressure sending tank 8, a first switch valve 9, a second switch valve 10, a second regulating valve 11, a material metering bin 12, a third regulating valve 13, a metering bin top dust collector 14, a metering buffer bin 15, a third switch valve 16, a mixer 17, a fourth switch valve 18, a weighing metering device 19, a nitrogen pipe 20, an air inlet switch valve 21, a first humidity online detector 22, a dryer 23, a return air switch valve 24, a pipeline filter 25, a second humidity online detector 26, a powder tank truck 27, a fifth switch valve 28, a ton bag feeding station 29, a first pressure transmitter 30, a second pressure transmitter 31, a third pressure transmitter 32, a fourth pressure transmitter 33, and a sixth switch valve 34, a seventh switch valve 35, an eighth switch valve 36, a star-shaped blanking device 37, a bracket 38, a docking cylinder 39, a docking pipe 40, a docking pipe 41, a ninth switch valve 42.

Detailed Description

As shown in fig. 1 to 4, an automatic proportioning and mixing system for multiple moisture-absorbing powders includes multiple raw material bins 1, and in this embodiment, three powder raw materials are used for illustration, i.e. the number of raw material bins 1 is three. The storehouse top of former feed bin 1 is connected former feed bin storehouse top dust remover 2, the gas vent of former feed bin storehouse top dust remover 2 passes through the entry linkage of the air-blower 3 that pipeline and each former feed bin 1 correspond, the gas vent of former feed bin storehouse top dust remover 2 is equipped with evacuation pipe 4, be equipped with first evacuation valve 5 on the evacuation pipe 4, the export of air-blower 3 passes through the pipeline to be connected with former feed bin 1, the gas holder 6 passes through the entry linkage of pipeline and air-blower 3, be equipped with first governing valve 7 on the connecting tube of gas holder 6 and air-blower 3, be compressed air or nitrogen gas in the gas holder 6, according to carrying powder material characteristic difference, select different transport media for use, like: the powder conveying medium can be contacted with air, and compressed air can be used for the powder conveying medium; the powder material which cannot be contacted with oxygen in the air is nitrogen gas as a conveying medium. The bin outlet of the raw material bin 1 is connected with the feed inlet of the positive pressure sending tank 8, the bin outlet of the raw material bin 1 and the feed inlet of the positive pressure sending tank 8 are respectively provided with a first switch valve 9 and a second switch valve 10, the positive pressure sending tank 8 is connected with the air storage tank 6 through a pipeline, and a second regulating valve 11 is arranged on the pipeline connected with the positive pressure sending tank 8 and the air storage tank 6.

The discharge port of the positive pressure sending tank 8 is connected with the feed port of the material metering bin 12 through a pipeline, a ninth switching valve 42 is arranged on the pipelines of the positive pressure sending tank 8 and the material metering bin 12, the material metering bin 12 is connected with the air storage tank 6 through a pipeline, a third regulating valve 13 is arranged on the pipeline connected with the material metering bin 12 and the air storage tank 6, and the top of the material metering bin 12 is connected with a metering bin top dust remover 14.

The discharge opening of the material metering bin 12 is connected with the feed inlet of the metering buffer bin 15 through a pipeline, the discharge opening of the material metering bin 12 is provided with a third switch valve 16, the discharge opening of the metering buffer bin 15 is connected with the feed inlet of the mixer 17, the feed inlet of the mixer 17 is provided with a fourth switch valve 18, and the mixer 17 is a vertical mixer.

The raw material bin 1, the positive pressure sending tank 8, the metering buffer bin 15 and the material metering bin 12 are all provided with weighing metering devices 19. The weighing and metering device 19 can be a morning glory weighing pressure sensor module, and the specification can be CWC-220kg.

The feed inlet of the metering surge bin 15 is provided with a star-shaped blanking device 37. The metering buffer bin 15 is provided with three star-shaped feeders 37 corresponding to the material metering bin 12, the three star-shaped feeders 37 respectively correspond to the material metering bin 12, each time one material is fed, the feeding speed is controlled through the corresponding star-shaped feeders 37, the chain weighing metering device 19 controls the feeding weight, and after the feeding weight reaches a set value, the chain star-shaped feeders 37 stop feeding.

When the device is specifically used, each valve adopts a pneumatic valve, and each pneumatic valve provides instrument gas through an instrument buffer tank.

The instrument buffer tank and the air storage tank 6 are provided with a pressure transmitter, a safety valve, a bottom blowdown installation blowdown valve and a manual ball valve.

The number of the raw material bin tops of the dust collectors 2, the air blowers 3, the positive pressure sending tank 8 and the material metering bins 12 are three corresponding to the number of the raw material bins 1.

The outlet of the raw material bin 1 is connected with the positive pressure sending tank 8 through a pipeline, and is conveyed to the material metering bin 12 through compressed air or nitrogen, a dust remover 14 at the top of the metering bin is arranged above the material metering bin 12, and the gas-containing material flow conveyed through dense phase is discharged after being separated through the dust remover. The powder enters the metering buffer bin 15 for individual metering, after metering, one powder feeding is finished through the butt joint mixer 17, and after three powder feeding is finished in sequence, the mixer 17 starts to mix.

Preferably, the air inlet of the air storage tank 6 is connected with the nitrogen pipe 20, nitrogen in the nitrogen pipe 20 is from a nitrogen making machine or an original nitrogen storage tank, the air inlet of the air storage tank 6 is provided with an air inlet switch valve 21, a pipeline of the nitrogen pipe 20 is connected with a first humidity online detector 22 and a dryer 23, the first humidity online detector 22 is arranged at an outlet position of the dryer 23, the nitrogen pipe 20 is connected with the original nitrogen storage tank through a branch pipe, an air return switch valve 24 is arranged on the branch pipe, and a connection position of the branch pipe and the nitrogen pipe 20 is arranged at the downstream of the first humidity online detector 22.

After the nitrogen from the nitrogen making machine or the air from the air compressor is deeply dried by the dryer 23, the air is detected by the first humidity on-line detector 22, and can enter the air storage tank 6 when reaching the dew point of-70 ℃ for supplementing the pressure of the air conveying system of the blower 3 and micro positive pressure ventilation of the material metering bin 12, so that the whole system is isolated from the outside air; the unqualified medium with the humidity is returned to be treated again.

Preferably, a pipeline filter 25 is arranged on a pipeline connected with the blower 3 of the raw material bin top dust remover 2. By providing the duct filter 25, the return air can be dedusted again.

Preferably, a second humidity on-line detector 26 is arranged on a pipeline connected with the raw material bin 1 at the outlet of the blower 3. By providing a second humidity on-line detector 26 for monitoring the water content in the air circulation system, when the system humidity is not satisfactory, the system can be subjected to venting replacement and pressurized air or nitrogen with acceptable moisture content can be supplemented.

Preferably, the powder tank truck can feed materials according to two feeding modes, wherein the powder tank truck comprises a plurality of powder tank trucks 27, and the volume of the raw material bin 1 is larger than that of the powder tank trucks 27, so that the feeding is guaranteed to be discharged each time. The powder tank car 27 is connected with the outlet pipeline of the air blower 3 through the unloading butt joint pipeline, and three different raw materials are respectively air-fed to the raw material bin 1 through three air blowers 3, so that the mutual influence of different material residues is avoided, and when nitrogen is adopted as a conveying medium, a second humidity on-line detector 26 is respectively installed at the air outlet of the air blowers 3, and whether the moisture content in the circulating conveying medium exceeds the standard is detected.

And when the ton bags are charged, three different raw materials are respectively charged into the three groups of raw material bins 1 through the three groups of ton bag charging stations 29, and when the materials are charged, the fifth switching valve 28 corresponding to the materials is opened after the materials enter the charging port, and when the materials are charged, the fifth switching valve is closed, so that the air with large external moisture content is prevented from being contacted with the raw materials for a long time.

Preferably, the raw material bins 1 are provided with first pressure transmitters 30, each group of raw material bins 1 is correspondingly provided with two first pressure transmitters 30 for monitoring the pressure in the bins, and the first pressure transmitters 30 are used for interlocking the first emptying valve 5 and the first regulating valve 7 to regulate the pressure. And the first emptying valve 5 of the linkage emptying pipeline is opened for pressure relief when the pressure is over the overpressure, and is closed when the pressure is over the micro-positive pressure (0-3 kpa).

The positive pressure sending tank 8 is provided with a second pressure transmitter 31 for interlocking control of the sending tank to send materials.

The material metering bin 12 is provided with a third pressure transmitter 32, the third pressure transmitter 32 is linked with a third regulating valve 13 to regulate the pressure, the material metering bin is used for monitoring the pressure in the bin, and the third regulating valve 13 is linked to supplement the pressure during negative pressure to maintain micro-positive pressure (0-3 kpa) in the bin.

The exhaust port of the raw material bin top dust remover 2 is provided with a fourth pressure transmitter 33 and an exhaust pipe on a pipeline connected with the air inlet of the blower 3, the exhaust pipe is provided with a sixth switch valve 34, and the fourth pressure transmitter 33 is interlocked with the first regulating valve 7 and the sixth switch valve 34 to regulate pressure. The line pressure is monitored by a fourth pressure transmitter 33 and the air is supplemented or vented by controlling the first regulator valve 7 and a sixth on-off valve 34.

Preferably, a first communication pipe is arranged between the raw material bin 1 and the positive pressure sending tank 8, a seventh switch valve 35 is arranged on the first communication pipe, a second communication pipe is arranged between the material metering bin 12 and the metering buffer bin 15, and an eighth switch valve 36 is arranged on the second communication pipe.

The raw material bin 1 and the positive pressure sending tank 8 are communicated by opening the seventh switch valve 35, so that the pressure in the bin is ensured to be the same as that in the tank. The eighth switch valve 36 is opened to enable the material metering bin 12 to be communicated with the metering buffer bin 15, so that the pressure in the material metering bin 12 is ensured to be the same as the pressure in the metering buffer bin 15, and the discharging is facilitated.

As shown in fig. 5, the discharge port of the metering surge bin 15 is in butt joint with the discharge port of the mixer 17 through an automatic butt joint device, the automatic butt joint device comprises a bracket 38 arranged at the bottom of the metering surge bin 15, a butt joint cylinder 39 is arranged on the bracket 38, the discharge port of the metering surge bin 15 is connected with a corrugated pipe 40, a butt joint pipe 41 is arranged at the lower end of the corrugated pipe 40, and the telescopic end of the butt joint cylinder 39 is connected with the butt joint pipe 41. The air cylinder 39 drives the butt joint pipe 41 to move up and down, so that the corrugated pipe 40 stretches and contracts, and the butt joint of the discharge port of the metering surge bin 15 and the discharge port of the mixer 17 is completed.

When the system is particularly used, the system program sets three kinds of powder A, B, C as raw materials, the powder A, B, C is stored in a raw material bin 1 respectively, a conveying fan corresponding to the powder A, B, C is a blower 3, and three independent conveying systems are adopted; the feeding stations are three groups of ton bag feeding stations, and are used for feeding materials independently. The method comprises the following steps:

Step one, when the powder tank car comes the material, the powder tank car 27 is connected with the outlet pipeline of air-blower 3 through unloading butt joint pipeline, and three different raw and other materials are fed to former feed bin 1 through the wind respectively of three air-blowers 3, avoid different material to remain the mutual influence, when adopting nitrogen gas as the transport medium, install second humidity on-line measuring instrument 26 respectively at the air outlet of air-blower 3, detect whether the moisture content exceeds standard in the circulation transport medium.

The first regulating valve 7 is opened, the air blower 3 supplements dry compressed air for the conveying pipeline, the first emptying valve 5 of the raw material bin 1 corresponding to the air blower 3 is opened to exhaust, conveying pipeline gas is replaced, after the first humidity on-line detector 22 detects that media meet the requirement, the raw material bin 1 and pipeline pressure are monitored together through the first pressure transmitter 30 and the fourth pressure transmitter 33, the first regulating valve 7 and the sixth switching valve 34 are interlocked to supplement air or empty, after the system operation is stable, the powder tank truck 27 is manually docked with a discharge opening, and the discharge valve is opened to convey powder into the raw material bin 1.

When the material is fed by the ton bags, three different raw materials are respectively fed to the three groups of raw material bins 1 through the three groups of ton bag feeding stations 29, when the material is fed, the fifth switch valve 28 corresponding to the material is opened after the material enters the feeding port, and when the weighing device 19 of the raw material bin 1 reaches the set weight after the material is fed, the fifth switch valve 28 is interlocked to be closed, the feeding is completed, and the air with large external moisture content is prevented from being contacted with the raw material for a long time.

Step two, when the materials in one group of raw material bins 1 are discharged, for example, when powder A is fed, a seventh switch valve 35 of the raw material bin 1 corresponding to the powder A is opened, the pressure of the raw material bin 1 is the same as that of the positive pressure sending tank 8, a first switch valve 9 and a second switch valve 10 are opened, the powder enters the positive pressure sending tank 8 from the raw material bin 1, a weighing metering device 19 of the positive pressure sending tank 8 is used for weighing metering, when the feeding weight reaches a set value, the first switch valve 9 is closed, and then the second switch valve 10 is closed to finish the feeding of the powder in the positive pressure sending tank 8.

And thirdly, the positive pressure sending tank 8 is used as a power source to ensure that the inside of the tank is maintained at a certain pressure by taking the dried compressed air after decompression, the pressure is kept at 1.0-2.0 mpa, and the powder is conveyed by controlling the opening and closing of the ninth switching valve 42 according to the conveying height and the distance.

When the pressure in the positive pressure sending tank 8 corresponding to the powder A is reduced to less than or equal to 10kpa from 1 to 2mpa, the material in the tank can be judged to be conveyed, the weight difference of the positive pressure sending tank 8 is calculated at the moment to obtain the conveying quantity of the powder A, after the conveying of the powder A is finished, compressed air can continuously purge the pipeline for 3 to 5 seconds, and residual powder in the pipeline is conveyed into the material metering bin 12.

Step four, when the material metering bin 12 is not fed, ensuring that the pressure in the bin maintains a micro-positive pressure environment through a third regulating valve 13; when feeding, powder enters the material metering bin 12 along with the dry compressed air, the pressure in the bin rises, the third regulating valve 13 is closed along with the pressure, gas-containing powder enters the material metering bin 12, gas-solid separation is completed through the metering bin top dust remover 14, and gas phase is discharged out of the bin, so that the volume of the material metering bin 12 is ensured to be larger than that of the positive pressure transmitting tank 8, the purpose of one-tank one-transmission is achieved, and the blockage of a pipeline system caused by a powder residual pipeline is avoided.

And repeating the steps one to four to finish the process that the powder B and the powder C enter the corresponding material metering bin 12.

Step five, each component powder sequentially enters the metering buffer bin 15, in this embodiment, it may be set to perform the feeding of the powder a first, open the metering bin 12 corresponding to the powder a and the eighth switch valve 36 on the second communicating pipe of the metering buffer bin 15, open the third switch valve 16, and simultaneously open the star-shaped blanking device 37 of the metering buffer bin 15, so as to stably control the blanking amount of the powder a, and the powder a in the material metering bin 12 enters the metering buffer bin 15.

At this time, the weighing and metering device 19 of the material metering bin 12 performs weight reduction metering, the metering buffer bin 15 performs weight increase metering, after the material entering the metering buffer bin 15 reaches a set value, the eighth switch valve 36 is closed, the star-shaped blanking device 37 is closed after 5-10 s, the weighing and metering device 19 of the metering buffer bin 15 performs metering for the set value of the powder a = the actual required material amount-the weight of the material between the pipe sections, and the shorter the pipe section is, the more favorable for metering precision.

Step six, after the powder enters the metering buffer bin 15, the automatic butting device acts, the butting pipe 41 is driven to move downwards through the air cylinder 39, the corrugated pipe 40 is extended, the butting pipe 41 is in butting joint with a material port of the mixer 17, the third switch valve 16 and the fourth switch valve 18 are opened, the powder enters the mixer 17, after powder feeding is completed, the third switch valve 16 and the fourth switch valve 18 are closed, the automatic butting device is reset, and metering and feeding processes of powder A are completed. The weight of the weighing and metering device 19 of the metering buffer bin 15 is reduced, and the weight is compared with a set value, and the weight reduction value is the powder A batching weight.

And step seven, repeating the steps five to six to finish the metering and feeding processes of the materials in the material metering bin 12 corresponding to the powder B and the powder C, and after the powder A, B, C is separately and independently metered and fed into the mixer 17, starting the mixer 17 to mix materials.

Claims (9)

1. An automatic proportioning and mixing system for various moisture-absorbing powder materials is characterized by comprising a plurality of raw material bins (1), wherein the bin tops of the raw material bins (1) are connected with raw material bin top dust collectors (2), the exhaust ports of the raw material bin top dust collectors (2) are connected with the inlets of air blowers (3) corresponding to the raw material bins (1) through pipelines, the exhaust ports of the raw material bin top dust collectors (2) are provided with emptying pipes (4), the emptying pipes (4) are provided with first emptying valves (5), the outlets of the air blowers (3) are connected with the raw material bins (1) through pipelines, air storage tanks (6) are connected with the inlets of the air blowers (3) through pipelines, and first regulating valves (7) are arranged on connecting pipelines of the air storage tanks (6) and the air blowers (3);

the discharging port of the raw material bin (1) is connected with the feeding port of the positive pressure sending tank (8), the discharging port of the raw material bin (1) and the feeding port of the positive pressure sending tank (8) are respectively provided with a first switch valve (9) and a second switch valve (10), the positive pressure sending tank (8) is connected with the air storage tank (6) through a pipeline, and a second regulating valve (11) is arranged on the pipeline connecting the positive pressure sending tank (8) and the air storage tank (6);

The discharge port of the positive pressure sending tank (8) is connected with the feed port of the material metering bin (12) through a pipeline, a ninth switching valve (42) is arranged on the pipeline of the positive pressure sending tank (8) and the pipeline of the material metering bin (12), the material metering bin (12) is connected with the air storage tank (6) through a pipeline, a third regulating valve (13) is arranged on the pipeline connected with the material metering bin (12) and the air storage tank (6), and the top of the material metering bin (12) is connected with a dust remover (14) at the top of the metering bin;

The material outlet of the material metering bin (12) is connected with the material inlet of the metering buffer bin (15) through a pipeline, the material outlet of the material metering bin (12) is provided with a third switch valve (16), the material outlet of the metering buffer bin (15) is connected with the material inlet of the mixer (17), and the material inlet of the mixer (17) is provided with a fourth switch valve (18);

The material weighing and metering device (19) is arranged on the raw material bin (1), the positive pressure sending tank (8), the metering buffer bin (15) and the material metering bin (12).

2. The automatic proportioning and mixing system for various moisture-absorbing powder materials according to claim 1, wherein an air inlet of the air storage tank (6) is connected with a nitrogen pipe (20), nitrogen in the nitrogen pipe (20) is from a nitrogen making machine or an original nitrogen storage tank, an air inlet of the air storage tank (6) is provided with an air inlet switch valve (21), a pipeline of the nitrogen pipe (20) is connected with a first humidity online detector (22) and a dryer (23), the first humidity online detector (22) is arranged at an outlet position of the dryer (23), the nitrogen pipe (20) is connected with the original nitrogen storage tank through a branch pipe, a return air switch valve (24) is arranged on the branch pipe, and a connection position of the branch pipe and the nitrogen pipe (20) is arranged at the downstream of the first humidity online detector (22).

3. The automatic proportioning and mixing system for a plurality of moisture-absorbing powder materials according to claim 1, wherein a pipeline filter (25) is arranged on a pipeline connected with the blower (3) of the raw material bin top dust remover (2).

4. The automatic proportioning and mixing system for a plurality of moisture-absorbing powders according to claim 1, wherein a second humidity on-line detector (26) is arranged on a pipeline connected with the raw material bin (1) at the outlet of the blower (3).

5. An automatic proportioning mixing system for a plurality of moisture-absorbing powders according to claim 1, comprising a plurality of powder tank trucks (27), the powder tank trucks (27) being connected to the outlet pipe of the blower (3) through a discharge docking pipe; or the raw material bin (1) is provided with a ton bag feeding port, the ton bag feeding port is provided with a fifth switch valve (28), and the ton bag feeding station (29) feeds the raw material bin (1).

6. The automatic proportioning and mixing system for a plurality of moisture-absorbing powders according to claim 1, wherein the raw material bin (1) is provided with a first pressure transmitter (30), and the first pressure transmitter (30) is interlocked with a first emptying valve (5) and a first regulating valve (7) for pressure regulation; be equipped with second pressure transmitter (31) on malleation send jar (8), material measurement storehouse (12) are equipped with third pressure transmitter (32), and third pressure transmitter (32) chain third governing valve (13) carry out pressure regulation, are equipped with fourth pressure transmitter (33) and blast pipe on the pipeline that the gas vent of former feed bin roof dust remover (2) and the air inlet of air-blower (3) are connected, are equipped with sixth ooff valve (34) on the blast pipe, and fourth pressure transmitter (33) chain sixth ooff valve (34) carry out pressure regulation.

7. The automatic proportioning and mixing system for various moisture-absorbing powder materials according to claim 1, wherein a first communication pipe is arranged between the raw material bin (1) and the positive pressure sending tank (8), a seventh switch valve (35) is arranged on the first communication pipe, a second communication pipe is arranged between the material metering bin (12) and the metering buffer bin (15), and an eighth switch valve (36) is arranged on the second communication pipe.

8. An automatic proportioning mixing system for a plurality of moisture-absorbing powders as claimed in claim 1, wherein the feed inlet of the metering surge bin (15) is provided with a star-shaped blanking device (37).

9. An automatic proportioning and mixing system for a plurality of moisture-absorbing powders according to claim 1, wherein the discharge port of the metering and buffering bin (15) is connected with the discharge port of the mixer (17) through an automatic butt joint device, the automatic butt joint device comprises a bracket (38) arranged at the bottom of the metering and buffering bin (15), a butt joint cylinder (39) is arranged on the bracket (38), the discharge port of the metering and buffering bin (15) is connected with a corrugated pipe (40), the lower end of the corrugated pipe (40) is provided with a butt joint pipe (41), and the telescopic end of the butt joint cylinder (39) is connected with the butt joint pipe (41).