Blanking method and device for precise batching of cohesive powder

Abstract

The invention belongs to the technical field of sticky powder conveying, and particularly relates to a discharging method and device for precise batching of sticky powder. The method comprises the steps that S1, a feeding system is assembled, S2, materials are conveyed, and the initial discharging amount M1 is recorded, S3, M1 is compared with a set value, S4, when M1 reaches the set value, feeding is stopped, the discharging rate is reduced, and the discharging amount M2 is calculated, and S5, the discharging amount M2 is recorded, and after the total discharging amount reaches a target value, remaining materials are conveyed. The feeding amount of the screw feeder is controlled, the error between the actual feeding amount and the needed feeding amount of the screw feeder is reduced, meanwhile, negative pressure of the vacuum pump and auxiliary air conveying of the breathing machine are adopted, and caking of cohesive powder is effectively prevented. The discharging behavior of materials in the pipeline is monitored, the gravity change of the weighing solid flow monitor and the flow of the microwave mass flow monitor are calculated and processed through the control system, and the feeding amount of the storage tank and the screw feeder is monitored in real time.

Description

Technical Field

[0001] The present invention belongs to the technical field of sticky powder conveying, and particularly relates to a feeding method and a feeding device for accurate batching of cohesive powder. Background Art

[0002] Lithium batteries are a type of battery with graphite, hard carbon, silicon carbon, etc. as the negative electrode material and using a non-aqueous electrolyte solution. They have the characteristics of high energy density, lightweight, fast charge and discharge, and long life. Using the battery as an energy source, a current with a stable voltage, stable current, long-term stable power supply, and little influence from the outside can be obtained. Moreover, the battery has a simple structure, is easy to carry, the charge and discharge operations are simple and easy, and it is not affected by the external climate and temperature, and the performance is stable and reliable. It is widely used in fields such as portable electronic devices, electric vehicles, energy storage systems, aerospace fields, and medical devices.

[0003] A lithium-ion battery is composed of electrodes (positive electrode / negative electrode), a separator, and an electrolyte. As a key component of a lithium-ion battery, the product quality of the negative electrode material has a decisive influence on the performance of the lithium-ion battery. In the batching and mixing section of the negative electrode material, since the viscous substance is the main additive and has high requirements for the addition amount, but due to the easy agglomeration of the sticky powder, problems such as uneven feeding and blockage of the feeding pipe will occur. In order to ensure product quality, each enterprise adopts an artificial semi-automatic method during the production process, resulting in high labor intensity and low efficiency.

[0004] Therefore, there is an urgent need to design a feeding method and device for accurate batching of cohesive powder to solve technical problems such as easy agglomeration of sticky powder, uneven feeding, and blockage of the feeding pipe.

[0005] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application, and therefore, it may include information that does not constitute the prior art. Summary of the Invention

[0006] The embodiments of the present disclosure at least provide a feeding method and a feeding device for accurate batching of cohesive powder.

[0007] In a first aspect, the embodiments of the present disclosure provide a feeding method for accurate batching of cohesive powder, including the following steps:

[0008] Step S1, sequentially connect a feeding device, a temporary storage device, a receiving device, and a gas source device to form a feeding system, install a weighing solid flow monitor on the feeding device, install a microwave mass flow monitor on the temporary storage device, and electrically connect the weighing solid flow monitor, the microwave mass flow monitor, the feeding device, and the gas source device to a control module;

[0009] Step S2, the control module turns on the air source device and the feeding device. The material passes through the feeding device and the temporary storage device in sequence and enters the receiving device. The microwave mass flow monitor records the feeding amount M1 of the feeding device and feeds back a signal to the control module;

[0010] Step S3, the control module determines whether M1 reaches the set value M according to the signal fed back by the microwave mass flow monitor S ;

[0011] Step S4, after M1 reaches the set value M S , the control module turns off the air source device, reduces the feeding rate of the feeding device, and calculates the discharge amount M2 that needs to enter the temporary storage device;

[0012] Step S5, the weighing solid flow monitor records the discharge amount M2 that enters the temporary storage device, and calculates the total discharge amount M of the feeding system through the control module. The formula is as follows:

[0013] M = M1 + M2;

[0014] Judge whether M reaches the target discharge amount M0;

[0015] Step S6, when M reaches M0, turn off the feeding device, turn on the air source device, and the material in the temporary storage device enters the receiving device.

[0016] In an optional implementation manner, in step S3, the formula for judging whether the discharge amount M1 of the feeding device reaches the set value is as follows:

[0017]

[0018] If the above formula holds, execute step S4; otherwise, the feeding device continues to feed.

[0019] In an optional implementation manner, in step S4, the calculation formula for the discharge amount M2 that needs to enter the temporary storage device is as follows:

[0020] M2 = M0 - M1

[0021] In an optional implementation manner, in step S5, the formula for judging whether the total discharge amount M of the feeding system reaches the target discharge amount M0 is as follows:

[0022]

[0023] If the above formula holds, execute step S6; otherwise, stop running, check the system settings, and return to step S1.

[0024] In an optional implementation manner, in step S4, after the feeding rate of the feeding device is reduced, its actual feeding rate does not exceed 20% of the rated feeding rate.

[0025] In an alternative embodiment, the volume V of the temporary storage device is determined according to the material characteristics, through the formula:

[0026]

[0027] where 10% ≤ k ≤ 20%, ρ is the density of the material, and the temporary storage device is selected according to the calculation result.

[0028] In a second aspect, the embodiment of the present disclosure further provides a blanking system for precise batching of cohesive powder, which is applied to execute the blanking method for precise batching of cohesive powder as described above. The blanking system for precise batching of cohesive powder includes:

[0029] A storage tank, a screw feeder, a temporary storage device, a receiving tank, and a vacuum pump connected in sequence to convey materials;

[0030] A weighing solid flow monitor is installed at the bottom of the screw feeder to monitor the discharge amount of the screw feeder;

[0031] A microwave mass flow monitor is installed on one side of the temporary storage device to monitor the feeding amount of the screw feeder;

[0032] A control center, and the weighing solid flow monitor, the microwave mass flow monitor, the screw feeder, and the vacuum pump are all electrically connected to the control center;

[0033] Moreover, the control center receives the feedback signals of the weighing solid flow monitor and the microwave mass flow monitor, judges the total discharge amount of the material, and controls the opening and closing of the feeding motor and the solenoid valve, and conveys the material that meets the target discharge amount from the storage tank to the receiving pipe.

[0034] In an alternative embodiment, a ventilator is installed on one side of the discharge port of the screw feeder to supplement gas into the screw feeder.

[0035] In an alternative embodiment, soft connections are adopted at the connections between the temporary storage device and the screw feeder and the blanking bin.

[0036] In an alternative embodiment, a blanking bin is further installed between the temporary storage device and the receiving tank, and an air supply valve is installed at one end of the blanking bin far from the receiving tank.

[0037] The beneficial effects of the present invention are as follows: 1. Through the coordinated setting of the stop valve, feeding motor, ventilator solenoid valve, and vacuum pump, the present invention can achieve the switching between large-flow feeding and small-flow feeding of the screw feeder, ensure the feeding speed of the system, reduce the error between the actual feeding amount and the required feeding amount of the screw feeder, and at the same time use the negative pressure of the vacuum pump and the ventilator for auxiliary conveying to effectively prevent the caking of cohesive powders. 2. Through the collaborative measurement of the weighing solid flow monitor and the microwave mass flow monitor, the flow rate of the material is measured to judge the discharge amount of the conveyed material. By means of segmented feeding, the accurate feeding of cohesive powders can be realized, which is convenient for the regulation of the material addition amount.

[0038] Other features and advantages of the present invention will be described in the subsequent description, and in part, will be obvious from the description or will be understood by implementing the present invention. The objectives and other advantages of the present invention are realized and obtained in the structures specifically pointed out in the description, claims, and drawings.

[0039] To make the above objectives, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 The first structural schematic diagram of a feeding system for accurate batching of cohesive powders provided by an embodiment of the present disclosure;

[0042] Figure 2 The second structural schematic diagram of a feeding system for accurate batching of cohesive powders provided by an embodiment of the present disclosure;

[0043] Figure 3 The third structural schematic diagram of a feeding system for accurate batching of cohesive powders provided by an embodiment of the present disclosure;

[0044] Figure 4 The flow chart of a method for accurate feeding of cohesive powders provided by an embodiment of the present disclosure.

[0045] In the figure:

[0046] 1. Storage tank; 2. Shut-off valve; 3. Screw feeder; 4. Feeding motor; 5. Weighing solid flow monitor; 6. Damper; 7. Respirator; 8. Flexible connection; 9. Microwave mass flow monitor; 10. Temporary storage device; 11. Solenoid valve; 12. Discharge bin; 13. Receiving tank; 14. Filter; 15. Vacuum pump; 16. Control center; 17. Air supply valve; C1. First control unit; C2. Second control unit. Detailed implementation manners

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0048] Through research, it is found that as a key component of lithium-ion batteries, the product quality of the negative electrode material has a decisive impact on the performance of lithium-ion batteries. In the batching and mixing section of the negative electrode material, since viscous substances are the main additives, there are high requirements for the addition amount. However, due to the easy agglomeration of viscous powders, problems such as uneven feeding and clogging of the feeding pipe may occur. To ensure product quality, each enterprise adopts a manual semi-automatic method during the production process, resulting in high labor intensity and low efficiency.

[0049] Regarding the defects existing in the above solutions, they are all the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure for the above problems in the following text should all be the contributions made by the inventor to the present disclosure during the process of the present disclosure.

[0050] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments may be combined with each other. In addition, in the drawings, to effectively describe the technical content, the thickness of the components may be exaggerated or reduced.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0052] Based on the above research, the embodiments of the present disclosure provide a feeding method for precise batching of cohesive powders. In a pneumatic conveying system, a microwave solid flowmeter is used to monitor the feeding behavior of materials in the pipeline. Through the control system, the gravity change of the weighing sensor and the flow rate of the microwave solid flowmeter are calculated and processed to monitor the feeding amounts of the storage tank and the screw feeder in real time. The specific steps of this method are as follows:

[0053] Step S1, sequentially connect the feeding device, the temporary storage device, the material receiving device and the gas source device to form a feeding system. Install a weighing solid flow monitor 5 on the feeding device and a microwave mass flow monitor 9 on the temporary storage device. Electrically connect the weighing solid flow monitor 5, the microwave mass flow monitor 9, the feeding device and the gas source device to the control module;

[0054] Step S2, the control module turns on the gas source device and the feeding device. The material sequentially passes through the feeding device and the temporary storage device and enters the material receiving device. The microwave mass flow monitor 9 records the feeding amount M1 of the feeding device and feeds back a signal to the control module;

[0055] Step S3, the control module determines whether M1 reaches the set value M according to the signal fed back by the microwave mass flow monitor 9 S ;

[0056] Step S4, after M1 reaches the set value M S , the control module turns off the gas source device, reduces the feeding rate of the feeding device, and calculates the discharge amount M2 that needs to enter the temporary storage device;

[0057] Step S5, the weighing solid flow monitor 5 records the discharge amount M2 entering the temporary storage device, and calculates the total discharge amount M of the feeding system through the control module. The formula is as follows:

[0058] M = M1 + M2;

[0059] Judge whether M reaches the target discharge amount M0;

[0060] Step S6, when M reaches M0, turn off the feeding device, turn on the gas source device, and the material in the temporary storage device enters the material receiving device.

[0061] In at least one embodiment, in step S3, the formula for judging whether the discharge amount M1 of the feeding device reaches the set value is as follows:

[0062]

[0063] If the above formula holds, execute step S4; otherwise, the feeding device keeps feeding.

[0064] In at least one embodiment, in step S3, M S is 95% of the target discharge amount M0 value. In some other embodiments, M S can also be set to 90 - 99% of the M0 value according to the actual discharge amount level. In this step, it is only necessary to detect the discharge action by the microwave mass flow monitor 9 until it is close to the target discharge amount M0.

[0065] In at least one embodiment, in step S4, the calculation formula for calculating the discharge amount M2 that needs to enter the temporary storage device is as follows:

[0066] M2 = M0 - M1

[0067] In at least one embodiment, in step S5, the formula for determining whether the total discharge amount M of the feeding system reaches the target discharge amount M0 is as follows:

[0068]

[0069] If the above formula holds, execute step S6; otherwise, stop running, check the system settings, and return to step S1.

[0070] In at least one embodiment, in step S4, after the feeding rate of the feeding device is reduced, its actual feeding rate does not exceed 20% of the rated feeding rate.

[0071] In at least one embodiment, the volume V of the temporary storage device is determined according to the material characteristics, through the formula:

[0072]

[0073] where 10% ≤ k ≤ 20%, ρ is the density of the material, and a temporary storage device of a suitable size is selected according to the calculation result.

[0074] In addition, the embodiment of the present disclosure also provides a blanking system for precise batching of cohesive powder, which is applied to execute the blanking method for precise batching of cohesive powder as described above. Refer to Figure 1 , the blanking system for precise batching of cohesive powder includes: a storage tank 1, a screw feeder 3, a temporary storage device 10, a receiving tank 13, and a vacuum pump 15 that are connected in sequence to convey materials. The storage tank 1 is suitable for storing materials in an initial state, and the discharge port of the storage tank 1 is connected to the feed port of the screw feeder 3. The screw feeder 3 has a rod body and a propeller blade outside the rod body. A feeding motor 4 is installed at one end of the screw feeder 3 at the feed port, and the feeding motor 4 is connected to the rod body. When the feeding motor 4 is started, the rod body rotates to convey materials through the propeller blade. By reducing the rotation speed of the feeding motor 4, the rotation speed of the propeller blade can be reduced, and thus the feeding efficiency of the screw feeder 3 can be reduced; conversely, by increasing the rotation speed of the feeding motor 4, the feeding efficiency of the screw feeder 3 can be increased. When the vacuum pump 15 is started, it can generate a negative pressure suction force to suck the materials in the temporary storage device 10 into the receiving tank 13 to achieve the effect of material conveying.

[0075] Refer to Figure 1In at least one embodiment, the temporary storage device 10 is a square storage tank. After the material enters the temporary storage device 10 from the screw feeder 3, it will not directly enter the receiving tank 13. When the vacuum pump 15 is not started, the material can be temporarily stored in the temporary storage device 10.

[0076] Reference Figure 2 In some embodiments, the temporary storage device 10 can also be designed in other forms, such as a U-shaped tube, and the upward tube end of the U-shaped tube is connected to the discharge port of the screw feeder 3, and the downward tube end of the U-shaped tube is connected to the receiving tank 13 to achieve the same effect of temporarily storing materials as above.

[0077] Reference Figure 3 In some embodiments, the temporary storage device 10 can also be designed in other forms, such as a straight pipe with a certain slope, and the lower end is connected to the discharge port of the screw feeder 3, and the high end is connected to the receiving tank 13, so as to achieve the same effect of temporarily storing materials as above.

[0078] In some embodiments, when selecting a temporary storage device 10, it is also necessary to consider the physical properties of the system conveying materials, such as particle size distribution, fluidity, adhesion and cohesion, bulk density, stacking angle, water content, etc., especially for non-lithium ion battery negative electrode materials. The above formula should be used as a basis to calculate the reference volume value, and the actual volume should be further determined in combination with experiments, and a temporary storage device 10 of a suitable volume should be selected.

[0079] Reference Figure 1 In at least one embodiment, a microwave mass flow monitor 9 is installed on one side of the temporary storage device 10 to monitor the discharge amount of the screw feeder 3. That is, when the material in the screw feeder 3 enters the temporary storage device 10 from the discharge port and passes through the microwave mass flow monitor 9, the microwave mass flow monitor 9 starts to record the discharge amount of the temporary storage device 10.

[0080] Reference Figure 1 In at least one embodiment, a weighing solid flow monitor 5 is installed at the bottom of the screw feeder 3 to monitor the discharge amount of the screw feeder 3. The weighing solid flow monitor 5 is zeroed, and after the material in the storage tank 1 falls into the screw feeder 3, the weighing solid flow monitor 5 starts to record the discharge amount of the screw feeder 3.

[0081] Reference Figure 1 In at least one embodiment, a soft connection 8 is used at the connection between the screw feeder 3 and the temporary storage device 10 to reduce the influence of the negative pressure airflow on the measurement accuracy of the weighing solid flow monitor 5.

[0082] Reference Figure 1, in at least one embodiment, the feeding system for precise batching of cohesive powder also includes a control center 16, and the control center 16 further includes a first control unit C1 and a second control unit C2. The weighing solid flow monitor 5 and the feeding motor 4 are both electrically connected to the first control unit C1, and the microwave mass flow monitor 9 and the vacuum pump 15 are both electrically connected to the second control unit C2. Further, the first control unit C1 receives the feedback signal from the weighing solid flow monitor 5, and the second control unit C2 receives the feedback signal from the microwave mass flow monitor 9. The control center 16 determines the total discharge amount of the feeding system according to the signals received by the first control unit C1 and the second control unit C2, and controls the opening and closing of the screw feeder 3 and the vacuum pump 15, and conveys the material meeting the target discharge amount from the storage tank 1 to the receiving pipe.

[0083] Refer to Figure 1 , in at least one embodiment, a ventilator 7 is installed on one side of the discharge port of the screw feeder 3 to supplement gas into the screw feeder 3 to avoid powder blockage.

[0084] Refer to Figure 1 , in at least one embodiment, the short-term shaking generated when the material enters the screw feeder 3 will form a pressure on the weighing solid flow monitor 5 and be reflected in the discharge amount value recorded by the weighing solid flow monitor 5. At least one damper 6 is arranged on one side of the weighing solid flow monitor 5 to support the screw feeder 3, buffer the short-term shaking generated by the screw feeder 3, assist the weighing solid flow monitor 5, and improve the measurement accuracy.

[0085] Refer to Figure 1 , in at least one embodiment, a feeding bin 12 is further installed between the temporary storage device 10 and the receiving tank 13. The feeding bin 12 has three channels. A air supply valve 17 is installed at one end of the feeding bin 12 away from the receiving tank 13, and the remaining two channels of the feeding bin 12 are respectively installed with the temporary storage device 10 and the receiving tank 13. The air supply valve 17 is electrically connected to the second control unit C2. When the vacuum valve is opened, the air supply valve 17 and the breathing solenoid valve 8 are opened, so as to form an air pressure difference between the feeding bin 12 and the receiving tank 13, and an air pressure difference between the temporary storage device 10 and the receiving tank 13, and then push the materials in the feeding bin 12 and the temporary storage device 10 to be conveyed to the receiving tank 13.

[0086] Refer to Figure 1 , in at least one embodiment, a stop valve 2 is installed at the outlet of the storage tank 1. The stop valve 2 is electrically connected to the first control unit C1 to control the on-off between the storage tank 1 and the screw feeder 3. On the other hand, a filter 14 is arranged between the receiving tank 13 and the vacuum pump 15. The filter 14 is used to filter solid impurities in the passing gas to avoid solids entering the vacuum pump 15 and interfering with the operation of the vacuum pump 15.

[0087] In addition, in at least one embodiment, with reference to Figure 4 , the feeding system for precise batching of cohesive powder can execute the feeding method for precise batching of cohesive powder according to the following process, specifically:

[0088] A1. Connect the storage tank 1, the screw feeder 3, the temporary storage device 10, the receiving tank 13, and the vacuum pump 15 in sequence. A weighing solid flow monitor 5 is installed at the bottom of the screw feeder 3, and a microwave solid flowmeter 9 is installed on one side of the temporary storage device 10. The screw feeder 3, the vacuum pump 15, the weighing solid flow monitor 5, and the microwave solid flowmeter 9 are electrically connected to the control center 16;

[0089] A2. Set the material conveying order as n, and initialize n = 1;

[0090] A3. Start the screw feeder 3 and the vacuum pump 15. The material passes through the screw feeder 3 and the temporary storage device 10 in sequence and enters the receiving tank 13. The microwave solid flowmeter 9 records the discharge amount M1 of the feeding device and feeds back the signal to the control center 16;

[0091] A4. Determine whether M1 reaches the set value. If it reaches the set value, enter A5. If it does not reach the set value, return to A3 to continue discharging;

[0092] A5. Turn off the vacuum pump 15 and reduce the feeding efficiency of the screw feeder 3. The weighing solid flow monitor 5 monitors the discharge amount M2 entering the temporary storage device 10 and feeds back the signal to the control center 16;

[0093] A6. Calculate the total discharge amount M of this material conveying order;

[0094] A7. Determine whether M reaches the target discharge amount M0. If M reaches M0, enter A8. If M does not reach M0, enter A10;

[0095] A8. Turn off the screw feeder 3, turn on the vacuum pump 15, and the material in the temporary storage device 10 enters the receiving tank 13;

[0096] A9. Let n = n + 1 and return to A3;

[0097] A10. End.

[0098] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Taking the above-described ideal embodiments of the present invention as inspiration, through the above description, relevant staff can make various changes and modifications completely within the scope without departing from the technical idea of the disclosed embodiments of this item. The technical scope of the disclosed embodiments is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A feeding method for precise batching of cohesive powder, characterized in that, It includes the following steps: Step S1: Connect a feeding device, a temporary storage device, a material receiving device, and a gas source device in sequence to form a feeding system. Install a weighing solid flow monitor (5) on the feeding device, install a microwave mass flow monitor (9) on the temporary storage device, and electrically connect the weighing solid flow monitor (5), the microwave mass flow monitor (9), the feeding device, and the gas source device to a control module; Step S2: The control module turns on the gas source device and the feeding device. The material passes through the feeding device and the temporary storage device in sequence and enters the material receiving device. The microwave mass flow monitor (9) records the feeding amount M1 of the feeding device and feeds back a signal to the control module; Step S3, the control module determines whether M1 reaches the set value M according to the signal fed back by the microwave mass flow monitor (9). S ; Step S4, when M1 reaches the set value M S the control module closes the gas source device, reduces the feeding rate of the feeding device, and calculates the discharge amount M2 that needs to enter the temporary storage device; Step S5: The weighing solid flow monitor (5) records the discharge amount M2 entering the temporary storage device, and calculates the total discharge amount M of the feeding system through the control module. The formula is as follows: M = M1 + M2; Judge whether M reaches the target discharge amount M0; Step S6: When M reaches M0, turn off the feeding device and turn on the gas source device. The material in the temporary storage device enters the material receiving device.

2. The feeding method for precise batching of cohesive powder as described in claim 1, wherein In step S3, the formula for judging whether the discharge amount M1 of the feeding device reaches the set value is as follows: If the above formula holds, execute step S4; otherwise, the feeding device keeps feeding.

3. The feeding method for precise batching of cohesive powder as described in claim 1, wherein In step S4, the calculation formula for calculating the discharge amount M2 that needs to enter the temporary storage device is as follows: M2 = M0 - M1.

4. The feeding method for precise batching of cohesive powder as described in claim 1, wherein In step S5, the formula for judging whether the total discharge amount M of the feeding system reaches the target discharge amount M0 is as follows: If the above formula holds, execute step S6; otherwise, stop running, check the system settings, and return to step S1.

5. The feeding method for precise batching of cohesive powder as described in claim 1, wherein In step S4, after the feeding rate of the feeding device is reduced, its actual feeding rate does not exceed 20% of the rated feeding rate.

6. The feeding method for precise batching of cohesive powder as described in claim 1, wherein Determine the volume V of the temporary storage device according to the material characteristics, through the formula: where 10% ≤ k ≤ 20%, ρ is the density of the material, and select the temporary storage device according to the calculation result.

7. A blanking system for precise batching of cohesive powder, characterized in that, Applied to execute the feeding method for precise batching of cohesive powder as described in any one of claims 1-6, the feeding system for precise batching of cohesive powder includes: A storage tank (1), a screw feeder (3), a temporary storage device (10), a receiving tank (13), and a vacuum pump (15) connected in sequence to convey materials; A weighing solid flow monitor (5) is installed at the bottom of the screw feeder (3) to monitor the discharge amount of the screw feeder (3); A microwave mass flow monitor (9) is installed on one side of the temporary storage device (10) to monitor the feeding amount of the screw feeder (3); A control center (16), the weighing solid flow monitor (5), the microwave mass flow monitor (9), the screw feeder (3), and the vacuum pump (15) are all electrically connected to the control center (16); Moreover, the control center (16) receives the feedback signals of the weighing solid flow monitor (5) and the microwave mass flow monitor (9), judges the total discharge amount of the material, and controls the opening and closing of the feeding motor (4) and the solenoid valve (11), and conveys the material meeting the target discharge amount from the storage tank (1) to the receiving pipe.

8. The blanking system for precise batching of cohesive powder according to claim 7, characterized in that A ventilator (7) is installed on one side of the discharge port of the screw feeder (3) to supplement gas into the screw feeder (3).

9. The blanking system for precise batching of cohesive powder according to claim 7, characterized in that Soft connections (8) are used at the connections between the temporary storage device and the screw feeder (3) and the blanking bin (12).

10. The blanking system for precise batching of cohesive powder according to claim 7, characterized in that A blanking bin (12) is further installed between the temporary storage device (10) and the receiving tank (13), and an air supply valve is installed at one end of the blanking bin (12) away from the receiving tank (13).

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