CN117902328A - Carbon powder vacuum charging device and vacuum charging metering method based on same - Google Patents

Abstract

The invention belongs to the field of ferrous metallurgy vacuum treatment, and relates to a carbon powder vacuum feeding device and a vacuum feeding metering method based on the same. The device comprises a storage hopper, a feeding hopper and a receiving hopper arranged between the storage hopper and the feeding hopper, wherein the vibrating trough is arranged in the feeding hopper in a mode perpendicular to the discharging direction of the receiving hopper, and an even number of weighing sensors are symmetrically arranged on the side edges of the vibrating trough in pairs. The metering method comprises the following steps: incremental metering during discharging, and monitoring the weight of the material flowing into the charging hopper; stopping discharging when the weight of the material flowing into the charging hopper meets a first closing condition; the method comprises the steps of reducing weight and metering during feeding, and monitoring the weight of materials flowing out of a feeding hopper; and stopping feeding when the weight of the material flowing out of the feeding hopper meets the second closing condition. According to the invention, the feeding process is controlled by a secondary metering mode of combination of increment metering and decrement metering, so that the aim of accurately controlling the weight of the input materials is fulfilled.

Description

Carbon powder vacuum charging device and vacuum charging metering method based on same

Technical Field

The invention belongs to the technical field of ferrous metallurgy vacuum treatment, and relates to a carbon powder vacuum feeding device and a vacuum feeding metering method based on the same.

Background

The RH vacuum refining process in a steelworks is a refining process for producing high added value products, has various refining functions of decarburization, degassing, molten steel chemical composition adjustment, temperature adjustment, inclusion removal and the like, and plays an extremely important role in the production of steel grades such as silicon steel, automobile plates, household appliance plates and the like. In the smelting process of the RH refining furnace, a certain amount of carbon powder needs to be selectively added in a vacuum state, the influence of the added amount of carbon powder on the molten steel components in the smelting process is particularly great, and the quality of the molten steel is directly determined.

RH vacuum refining adopts vacuum feeding device, and the required carbon powder of many times feeding is stored in feeding device's storage silo in advance, and the storage silo is supported by three equal radius circumference equipartition's pressure sensor to set up electromagnetic vibration feeder in the export of storage silo, in order to throw into the vacuum tank with the carbon powder material. When the carbon powder in the storage bin is reduced to a preset value, the charging is considered to reach the preset charging amount.

In terms of the metering method, the mechanical interference of the electromagnetic vibration feeder is easy to receive by adopting the decrement metering method, the tailing of the electromagnetic vibration feeder is easy to escape from the detection of the weighing sensor, the metering control precision is reduced, the problems of poor control precision and serious carbon powder loss of the existing carbon powder vacuum charging device are caused, the absolute error of charging is even more than 10 kg/heat, and the refining requirement of high-quality steel is difficult to meet.

In addition, the gravity center of carbon powder accumulation changes greatly due to the change of accumulation morphology after carbon powder feeding, so that the stress state of the pressure sensor is changed from being pressed to being pulled, thereby influencing the output precision of the sensor signal.

Disclosure of Invention

In view of this, the invention provides a carbon powder vacuum charging device, in which a weighing sensor is arranged in a charging hopper to reduce the full-scale value of the sensor, thereby reducing the weighing error value and improving the accuracy of material charging. Based on the carbon powder vacuum charging device, the invention also provides a vacuum charging metering method, which detects the weight change of the materials in the charging hopper through a weighing sensor arranged in the charging hopper, and controls the charging process of the materials in the charging hopper in a secondary metering mode of combining increment metering and decrement metering so as to accurately control the weight of the materials.

In order to achieve the above purpose, the invention provides a carbon powder vacuum feeding device, which comprises a storage hopper and a feeding hopper which are communicated with each other, wherein the carbon powder in the storage hopper is fed into an RH vacuum tank through the feeding hopper. A receiving hopper is arranged between the storage hopper and the feeding hopper, the inlet end of the receiving hopper is connected with the outlet end of the storage hopper, and the outlet end of the receiving hopper is inserted into the feeding hopper.

Optionally, a weighing module is arranged at the outlet end of the receiving hopper, and the weighing module comprises a vibrating trough.

Optionally, the vibration silo sets up in the throwing hopper with the mode of the ejection of compact direction of perpendicular to receiving hopper, and the bottom of vibration silo is provided with vibration feeder. The outlet end of the receiving hopper is connected to the inlet end of the vibrating trough, the outlet end of the vibrating trough is connected to the RH vacuum trough, and the weighing sensors in even number are symmetrically arranged on the side edge of the vibrating trough in pairs.

Optionally, the number of the weighing sensors is 4, and the weighing sensors are symmetrically arranged on two sides of the vibration trough in a group.

Optionally, the weighing module further comprises a weighing frame, the weighing frame is fixedly arranged inside the charging hopper, and the vibration trough is arranged on the weighing frame through the vibration isolator.

Optionally, each weighing sensor is arranged on the weighing frame and is fixedly arranged in the feeding hopper through a sensor support fixedly arranged on the housing of the feeding hopper.

Optionally, the outlet end of the vibration trough is connected with a discharge chute, and the vibration trough is connected with the RH vacuum trough through the discharge chute.

Optionally, the storage hopper is arranged in the storage hopper shell, the storage hopper is a funnel-shaped container, the inner surface of the storage hopper is formed into a closed storage bin with the storage hopper shell, and the outer surface of the storage hopper is formed into a closed vacuum bin with the storage hopper shell.

Optionally, a three-way pressure equalizing pipe which is communicated with the storage bin, the vacuum bin and the outside is arranged on the storage hopper, a first end of the three-way pressure equalizing pipe is positioned in the storage bin, a second end of the three-way pressure equalizing pipe is positioned in the vacuum bin, and a third end of the three-way pressure equalizing pipe is connected to the outside.

Optionally, a pressure equalizing valve is arranged on a pipeline between the first end and the second end of the three-way pressure equalizing pipe, and a hollow breaking valve is arranged on a pipeline between the second end and the third end of the three-way pressure equalizing pipe.

Optionally, a vibrating knocker is arranged on the outer surface of the vacuum bin of the charging hopper.

Optionally, a feed valve is disposed at an inlet end of the storage hopper, and a discharge valve is disposed at an outlet end of the storage hopper.

Optionally, the inlet end of the storage hopper is connected to a receiving hopper, and a feeding hole which is opened and closed in a moving way is arranged on the receiving hopper.

Optionally, a vibration feeder is arranged at the bottom of the vibration trough.

Based on the carbon powder vacuum feeding device, the invention also provides a carbon powder vacuum feeding metering method, which comprises the following steps:

Incremental metering during discharging: when the storage hopper discharges materials, the materials in the storage hopper flow to the charging hopper, and the weighing sensor arranged in the charging hopper is used for monitoring the weight Ws of the materials flowing into the charging hopper; stopping feeding the material into the feeding hopper when the weight Ws of the material flowing into the feeding hopper meets a first closing condition;

decrement metering during feeding: when the material is fed into the material feeding hopper, the material in the material feeding hopper flows to the RH vacuum groove, and the weight Wz of the material flowing out of the material feeding hopper is monitored by a weighing sensor arranged in the material feeding hopper; and stopping feeding the material into the RH vacuum tank when the weight Wz of the material flowing out of the feeding hopper meets a second closing condition.

The first closing condition is: the weight Ws of the materials flowing into the charging hopper plus the weight Wsl of the previous residual materials are not less than the set weight Wt of the current charging and the weight Wl of the reserved residual materials.

The second closing condition is: the preset weight Wy of the current batch is less than the weight Wz of the material flowing out of the batch hopper, and the preset weight Wy of the current batch is less than the preset weight Wt of the current batch.

Optionally, when discharging, if the weight Ws of the material flowing into the charging hopper cannot meet the first closing condition within 10-30 s, judging that the storage hopper is empty, and returning the emptying state of the storage hopper and the total weight of the material in the charging hopper to an external upper network.

Optionally, if it is determined that the storage hopper is empty, the following steps are performed:

Starting storing based on a storing instruction sent by an external superior network;

Feeding materials into the storage until the storage setting time;

stopping storing and returning to the storage completion state to the external upper network.

Optionally, when starting to store materials, closing a discharging valve of a storage hopper, opening a broken valve of a three-way equalizing pipe, breaking vacuum on the storage hopper, and then opening a feeding valve of the storage hopper; when the material storage is stopped, the feeding valve of the material storage hopper is closed, the emptying valve of the three-way equalizing pipe is closed, the equalizing valve of the three-way equalizing pipe is opened, and the material storage hopper is vacuumized.

Optionally, when feeding, if the weight Wz of the material flowing out of the feeding hopper cannot meet the second closing condition within 20-40 s, judging that the feeding hopper is emptied, and returning the emptying state of the feeding hopper and the total weight of the fed material to an external upper network.

Optionally, after each feeding is finished, calculating the weight of the residual materials in the storage hopper, automatically generating a log report, and uploading the log report to an external upper network.

The invention has the beneficial effects that:

In terms of the feeding device, the prepared carbon powder is separated from the weighing sensor, and the weighing sensor is arranged in the feeding hopper, so that the full-scale value of the sensor is reduced, and the absolute value of the weighing error is reduced. In addition, the weighing sensors are symmetrically arranged at two sides of the vibration trough, so that the stress state of the sensor is prevented from being changed from being pressed to pulled, and the output precision of the sensor signal is improved. In addition, the three-way equalizing pipe provided by the invention enables the vacuumizing process and the vacuumizing process to be independent of each other, and can reduce ineffective loss caused by taking away carbon powder by airflow in the vacuumizing process and the vacuumizing process.

In terms of the metering method, the invention adopts a secondary metering mode combination of increment metering and decrement metering to control the feeding amount, and ensures the metering control precision to reduce the interference of the electromagnetic vibration feeder on the weighing metering control by obviously reducing the tailing amount discharged by the electromagnetic vibration feeder.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a vacuum carbon powder charging device according to the present invention;

FIG. 2 is a second schematic diagram of a vacuum charging device for toner according to the present invention;

FIG. 3 is a schematic diagram of a weighing module of the vacuum carbon powder charging device according to the present invention.

Reference numerals: 100-receiving hopper; 110-a feed inlet; 120-feeding valve; 200-a storage hopper; 210-a storage bin; 220-vibrating knocker; 230-a discharge valve; 240-a storage hopper housing; 250-vacuum bin; 300-receiving hopper; 400-feeding hopper; 410-vibration feeder; 420-a weighing module; 421-weighing frame; 422-a load cell; 423-vibration isolator; 424-sensor mount; 425-vibrating trough; 430-a discharge chute; 440-a hopper shell; 500-tee equalizing pipe; 510-breaking the air valve; 520-pressure equalizing valve.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.

Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

Referring to fig. 1 to 3, the present invention provides a carbon powder vacuum charging device, which comprises a storage hopper 200 and a charging hopper 400 that are communicated with each other, wherein a receiving hopper 300 is disposed between the storage hopper 200 and the charging hopper 400, an inlet end of the receiving hopper 300 is connected to an outlet end of the storage hopper 200, and an outlet end of the receiving hopper 300 is inserted into the charging hopper 400. The inlet end of the storage hopper 200 is provided with a feed valve 120 and the outlet end of the storage hopper 200 is provided with a discharge valve 230.

Further, an inlet end of the storage hopper 200 is connected to the receiving hopper 100, and a feed inlet 110 which is opened and closed movably is provided on the receiving hopper 100. The feed inlet 110 is preferably in the form of an air cylinder driven, openable, plug valve that is capable of completely closing the receiving hopper 100 and the storage silo 210 when closed. When the feeding device stores materials, the feeding valve 120 is opened, and materials thrown in by multiple heats enter the storage hopper 200 from the receiving hopper 100 and are stored in the storage hopper 200; when feeding material into the RH vacuum tank, the discharge valve 230 is opened, and the material is fed from the storage hopper 200 into the feeding hopper 400 via the receiving hopper 300 and then fed into the RH vacuum tank. The weight of the toner that does not overflow from the upper edge of the hopper 300 is set to the maximum nominal charge amount, and the single charge amount of the vacuum charging device should be equal to or less than the maximum nominal charge amount.

The weighing module 420 is arranged at the outlet end of the receiving hopper 300, the weighing module 420 comprises a vibrating trough 425, the vibrating trough 425 is perpendicular to the discharging direction of the receiving hopper 300, the outlet end of the receiving hopper 300 is connected to the inlet end of the vibrating trough 425, and the outlet end of the vibrating trough 425 is connected to the RH vacuum trough. Further, a discharge chute 430 is welded to the lower portion of the hopper 400, an outlet end of the vibration chute 425 is connected to an inlet end of the discharge chute 430, and an outlet end of the discharge chute 430 is connected to the RH vacuum tank. Preferably, the discharge chute 430 and RH vacuum tank material are fed to the RH vacuum tank via the discharge chute 430 of the hopper 400. The gas in the hopper 400 can be pumped away through the discharge chute 430 to create a vacuum environment within the hopper 400. During discharging, materials enter a vibration trough 425 of the charging hopper 400 from the storage hopper 200 through the receiving hopper 300; upon feeding, material enters the RH vacuum tank from the vibratory trough 425 via the discharge chute 430. In the discharging and feeding processes, the weighing sensor only needs to record the single feeding weight, so that a sensor with a small measuring range can be adopted, and a larger absolute value error is avoided.

The weighing module 420 also includes a vibratory feeder 410 disposed in the vibratory trough 425 and a plurality of weighing sensors 422 disposed on the sides of the vibratory trough 425. The number of the weighing cells 422 is preferably an even number, and the weighing cells 422 of the even number are symmetrically arranged on the side edge of the vibration trough 425 in pairs. Further, the weighing cells 422 are preferably arranged in groups of 4 symmetrically on both sides of the vibration trough 425.

The weighing module 420 further includes a weighing frame 421 fixedly disposed inside the hopper 400, and a weighing sensor 422 disposed on the weighing frame 421 and fixedly disposed inside the hopper 400 by a sensor support 424 welded to the housing of the hopper 400. The vibration chute 425 is mounted to the weighing frame 421 by vibration isolators 423.

The storage hopper 200 is a funnel-shaped container so that the material can flow out of the discharge valve under the action of self gravity. The storage hopper 200 is disposed within a storage hopper housing 240, and the storage hopper housing 240 is sealingly connected to a hopper 440 housing. The inner surface of the storage hopper 200 forms a closed storage silo 210 with the storage hopper housing 240 and the outer surface forms a closed vacuum silo 250 with the storage hopper housing 240. The storage hopper 200 is provided with a three-way pressure equalizing pipe 500 which is communicated with the storage bin 210, the vacuum bin 250 and the outside, a first end of the three-way pressure equalizing pipe 500 is connected to the storage bin 210, a second end is connected to the vacuum bin 250, and a third end is connected to the outside. A pressure equalizing valve is provided on the pipe between the first end and the second end of the three-way pressure equalizing pipe 500, and a blow-out valve 510 is provided on the pipe between the second end and the third end.

When the storage hopper 200 discharges materials to the receiving hopper 300, the emptying valve 510 is closed, the equalizing valve 520 is opened, on one hand, the vacuum pumping to the storage hopper 210 is facilitated, and on the other hand, the emptying valve is opened, and powder carried out when the pumped air flows out of the storage hopper 210 is sprayed into the vacuum hopper 250 and falls into the lower receiving hopper 300. When the storage hopper 200 stores materials, the equalizing valve 520 is closed, the emptying valve 510 is opened, so that the storage hopper 210 is communicated with the atmosphere, the feeding valve is conveniently opened, the emptying flow is injected into the storage hopper from the outside of the container, and the powder in the container is stirred by the airflow, so that the carbon powder bridging phenomenon of the powder at the outlet of the storage hopper 200 and the inlet of the receiving hopper 300 can be eliminated. When both the pressure equalizing valve 520 and the blow valve 510 are closed, the vessel internal pressure is maintained. Further, the side of the charging hopper 400 located on the vacuum bin 250 is provided with a vibration knocker 220, and when the material flows into the charging hopper 400 through the discharging valve, the vibration knocker 220 knocks the side wall of the charging hopper 400 to smoothly discharge the carbon powder. The receiving hopper 300 is sealed between the storage hopper 200 and the feeding hopper 400, and the storage hopper 200 and the feeding hopper 400 are made of compression-resistant materials with high air tightness.

Example 2

Based on the carbon powder vacuum charging device provided in the embodiment 1, the invention also provides a vacuum charging metering method, which comprises the following steps:

S1: receiving a feeding process instruction of an external upper network and confirming the set weight Wt of the current feeding.

S21: discharging, namely opening a discharging valve 230, and allowing the materials in the storage hopper 200 to flow into the feeding hopper 400 through the receiving hopper 300 by virtue of self weight;

S22: starting an incremental metering mode, and monitoring the weight Ws of the material flowing into the charging hopper 400;

s23: when the weight Ws of the material flowing into the hopper 400 satisfies the first closing condition, the discharge valve 230 is closed.

The first closing condition is: the weight Ws of the materials flowing into the charging hopper 400 plus the weight Wsl of the previous residual materials are equal to or more than the set weight Wt of the current charging and the weight Wl of the reserved residual materials.

S31: starting a decrement metering mode, and monitoring the weight Wz of the material flowing out of the charging hopper 400;

S32: feeding, starting a vibration feeder to enable the materials in the vibration trough 425 to flow into the discharge chute;

S33: when the weight Wz of the material exiting the hopper 400 meets the second shut-off condition, the vibratory feeder is shut off.

The second closing condition is: the current batch set weight Wt-preset error weight Wy < the material weight Wz exiting the batch hopper 400 < the current batch set weight Wt + preset error weight Wy.

S4: and returning to the external upper network a feeding completion state, and waiting for a feeding process instruction of the external upper network.

When step S23 is executed, if the weight Ws of the material flowing into the hopper 400 fails to satisfy the first closing condition within 10 to 30 seconds, it is determined that the storage hopper 200 is empty, and at this time, the discharge valve 230 is closed, and the empty state of the storage hopper 200 and the total weight of the material in the hopper 400 are returned to the external upper network.

When step S33 is executed, if the weight Wz of the material flowing out of the hopper 400 fails to satisfy the second closing condition within 20 to 40 seconds, it is determined that the hopper 400 is empty, and at this time, the vibratory feeder 410 is stopped, and the empty state of the hopper 400 and the total weight of the charged material are returned to the external upper network.

Further, when the vacuum charging device is in the emptying state of the storage hopper 200, the external upper network sends out a storage command, and the vacuum charging device performs the following operations:

s1: receiving and confirming a storage process instruction of an external upper network;

s2: closing the discharge valve 230 of the storage hopper 200;

s3: opening the emptying valve 510 of the three-way equalizing pipe 500 to allow the storage bin 210 to communicate with the atmosphere;

s4: opening the feed valve 120 of the storage hopper 200;

s5: storing materials from a feed inlet 110 of the receiving hopper 100 to the receiving hopper 100;

S6: stopping storing when the storing time is the storing set time, and closing the feeding valve 120;

S7: closing a broken air valve 510 of the three-way equalizing pipe 500, opening an equalizing valve 520 of the three-way equalizing pipe 500, and vacuumizing the storage bin 210;

s8: returning a storage completion state to the external upper network, and waiting for a feeding process instruction of the external upper network.

After the batch charging is finished each time, the combined metering program controller automatically calculates the weight of the residual materials of the storage hopper 200, gives an alarm for material shortage, automatically generates a log report and uploads the log report to an external upper network.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.

Claims (10)

1. The utility model provides a carbon powder material vacuum feeding device which characterized in that:

a receiving hopper (300) is arranged between the storage hopper (200) and the feeding hopper (400), the inlet end of the receiving hopper (300) is connected with the outlet end of the storage hopper (200), and the outlet end of the receiving hopper (300) is inserted into the feeding hopper (400);

The vibration trough (425) is arranged in the feeding hopper (400) in a mode of being perpendicular to the discharging direction of the receiving hopper (300), and a vibration feeder (410) is arranged at the bottom of the vibration trough (425);

The outlet end of the receiving hopper (300) is connected to the inlet end of the vibrating trough (425), the outlet end of the vibrating trough (425) is connected to the RH vacuum trough, and the weighing sensors (422) with even number are symmetrically arranged on the side edge of the vibrating trough (425) in pairs.

2. The apparatus according to claim 1, wherein: the storage hopper (200) is arranged in the storage hopper shell (240), the storage hopper (200) is a hopper-shaped container, the inner surface of the storage hopper (200) and the storage hopper shell (240) form a closed storage bin (210), the outer surface of the storage hopper (200) and the storage hopper shell (240) form a closed vacuum bin (250), the storage hopper (200) is provided with a three-way pressure equalizing pipe (500) communicated with the storage bin (210), the vacuum bin (250) and the outside, the first end of the three-way pressure equalizing pipe (500) is positioned in the storage bin (210), the second end of the three-way pressure equalizing pipe is positioned in the vacuum bin (250), and the third end of the three-way pressure equalizing pipe is connected to the outside.

3. The apparatus according to claim 2, wherein: a pressure equalizing valve (520) is arranged on a pipeline between the first end and the second end of the three-way pressure equalizing pipe (500), and a broken air valve (510) is arranged on a pipeline between the second end and the third end.

4. A device according to claim 3, characterized in that: the vibrating hopper (425) is mounted on the weighing frame (421) through the vibration isolator (423).

5. The apparatus according to claim 1, wherein: the inlet end of the storage hopper (200) is provided with a feed valve (120), and the outlet end of the storage hopper (200) is provided with a discharge valve (230).

6. A carbon powder vacuum charging metering method based on the carbon powder vacuum charging device according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:

Incremental metering during discharging: when the storage hopper (200) is used for discharging, the materials in the storage hopper (200) flow to the feeding hopper (400), and the weighing sensor (422) arranged in the feeding hopper (400) is used for monitoring the weight Ws of the materials flowing into the feeding hopper (400); stopping feeding the material into the feeding hopper (400) when the weight Ws of the material flowing into the feeding hopper (400) meets a first closing condition;

Decrement metering during feeding: when the material is fed into the material feeding hopper (400), the material in the material feeding hopper (400) flows to the RH vacuum groove, and the weight Wz of the material flowing out of the material feeding hopper (400) is monitored by utilizing a weighing sensor (422) arranged in the material feeding hopper (400); stopping feeding the material to the RH vacuum tank when the weight Wz of the material flowing out of the feeding hopper (400) meets a second closing condition; wherein,

The first closing condition is: the weight Ws of the materials flowing into the charging hopper (400) plus the weight Wsl of the previous residual materials are more than or equal to the set weight Wt of the current charging and the weight Wl of the reserved residual materials;

The second closing condition is: the preset weight Wy of the current batch is less than the weight Wz of the material flowing out of the batch hopper (400), and the preset weight Wy of the current batch is less than the preset weight Wt of the current batch.

7. The method according to claim 6, wherein: if the weight Ws of the material flowing into the charging hopper (400) cannot meet the first closing condition within 10-30 s, the charging hopper (200) is judged to be empty, and the emptying state of the charging hopper (200) and the total weight of the material in the charging hopper (400) are returned to an external upper network.

8. The method according to claim 6 or 7, characterized in that: if the weight Wz of the material flowing out of the charging hopper (400) cannot meet the second closing condition within 20-40 s, the charging hopper (400) is judged to be emptied, and the emptying state of the charging hopper (400) and the total weight of the charged material are returned to an external upper network.

9. The method according to claim 7, wherein: if it is determined that the storage hopper (200) has been emptied, the following steps are performed:

Starting storing based on a storing instruction sent by an external superior network;

feeding materials into a storage hopper (200) until the storage time is set;

stopping storing and returning to the storage completion state to the external upper network.

10. The method according to claim 9, wherein:

When the material storage is started, a discharging valve (230) of the material storage hopper (200) is closed, a breaking valve (510) of the three-way equalizing pipe (500) is opened, vacuum is broken on the material storage hopper (210), and a feeding valve (120) of the material storage hopper (200) is opened;

When the material storage is stopped, the feeding valve (120) of the material storage hopper (200) is closed, the emptying valve (510) of the three-way equalizing pipe (500) is closed, the equalizing valve (520) of the three-way equalizing pipe (500) is opened, and the vacuum is pumped to the material storage bin (210).