Powder feeding, demagnetizing and premixing equipment and premixing method

Abstract

The invention provides powder feeding demagnetizing premixing equipment and a premixing method.A premixing stirring tank is located on a weighing forklift and comprises a tank body and a stirring paddle, the tank body is provided with a containing space, the stirring paddle is arranged in the containing space of the tank body, a premixing filtering blowback device is arranged outside the tank body and communicated with the containing space, and the premixing filtering blowback device is arranged in the containing space of the tank body. The vibration demagnetizer is arranged on the tank body, the vibration demagnetizer is communicated with the containing space, one end of the sucking and conveying pipeline is connected with the vibration demagnetizer, and the other end of the sucking and conveying pipeline is used for being inserted into a powder container, so that powder in the powder container is sucked into the vibration demagnetizer and then enters the premixing stirring tank. According to the invention, raised dust can be reduced, the production environment is improved, powder magnetic foreign matters are reduced, the subsequent voltage consistency is ensured, the feeding weight precision is improved, the problem of proportion imbalance is avoided, the product quality is improved, dry powder premixing is realized, and the production efficiency is improved.

Description

[Technical Field] This invention relates to the field of battery manufacturing technology, and in particular to a powder feeding, demagnetizing, and premixing device and method. [Background Technology] In the manufacturing process of lithium batteries, the first step is material preparation. Material preparation involves adding nano- or micron-sized powder materials such as conductive agents, binders, graphite, lithium iron phosphate, and ternary lithium batteries to methyl or deionized water, and then homogenizing them to prepare a non-Newtonian fluid slurry, which facilitates coating operations in subsequent processes.

[0003] As time goes by and the industry develops, the industry now has increasingly higher requirements for the quality and environment of production workshops, and the voltage classification of finished battery cells is becoming more and more stringent. This requires strict control of dust and magnetic foreign matter in raw materials during the production process.

[0004] Currently, lithium battery cathode and anode materials are mostly nano- or micron-sized powders with large specific surface areas and light weight. Manual or gravity feeding generates dust that floats in the production workshop, making it difficult to clean and potentially causing batch-to-batch voltage instability. Furthermore, manual feeding lacks magnetic filtration, making it impossible to remove magnetic substances from the powder, especially for lithium iron phosphate materials, which inherently contain iron sources during synthesis, making it difficult to control magnetic foreign matter. Moreover, manual feeding lacks weight control or relies solely on packaging weight displays, while automatic feeding systems suffer from inaccurate weight dispensing, leading to imbalanced proportions and inconsistent electrical performance between different batches.

[0005] Therefore, it is necessary to provide a novel powder feeding, demagnetizing, and premixing device and method to overcome the above-mentioned defects. [Summary of the Invention] The purpose of this invention is to provide a powder feeding, demagnetizing, and premixing device and method to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a powder feeding, demagnetizing, and premixing device, comprising a weighing forklift, a premixing mixing tank, a premixing filter backflushing device, a vibrating demagnetizer, and a suction pipe; the premixing mixing tank is located on the weighing forklift, the premixing mixing tank includes a tank body and a stirring paddle, the tank body has a receiving space, the stirring paddle is disposed within the receiving space of the tank body, the premixing filter backflushing device is disposed outside the tank body and communicates with the receiving space, the vibrating demagnetizer is disposed on the tank body and communicates with the receiving space, one end of the suction pipe is connected to the vibrating demagnetizer, and the other end of the suction pipe is used to insert into a powder container to suction the powder in the powder container into the vibrating demagnetizer and then into the premixing mixing tank.

[0008] In a preferred embodiment, the tank includes a top plate, a bottom plate, and a side plate disposed between the top plate and the bottom plate, the top plate, the bottom plate, and the side plate forming the receiving space.

[0009] In a preferred embodiment, the premixed filter backflushing device is disposed on the side plate and close to the top plate. The premixed filter backflushing device includes a filter pipe and a blowing device. One end of the filter pipe is connected to the side plate, and the other end of the filter pipe is connected to the blowing device. A double-layer filter screen is disposed on the filter pipe.

[0010] In a preferred embodiment, the vibration demagnetizer is disposed on the top plate, and the vibration demagnetizer includes a demagnetizing element for adsorbing magnetic materials.

[0011] In a preferred embodiment, the bottom plate is connected to an isolation switch, which controls the bottom plate to open to release powder from the tank.

[0012] In a preferred embodiment, the suction pipe includes a connecting pipe and a conveying pipe. One end of the connecting pipe is connected to the vibrating demagnetizer, and the other end of the connecting pipe is connected to the conveying pipe. The end of the conveying pipe away from the connecting pipe is used to insert into a powder container for various powder materials.

[0013] In a preferred embodiment, the weighing forklift includes a platform, a plurality of wheels and a handle, the plurality of wheels being disposed below the platform, the handle being connected to one end of the platform, and the tank being located on the platform.

[0014] In a preferred embodiment, the system further includes a mixer, which includes a body and a top cover. The body has an internal space, and the top cover is disposed at one end of the body. The top cover can seal the internal space and can be opened to allow the internal space of the mixer to communicate with the receiving space of the tank. A stirring filter backflushing device is disposed on one side of the body, and the stirring filter backflushing device communicates with the internal space.

[0015] Secondly, the present invention also provides a premixing method for the powder feeding and demagnetizing premixing equipment according to any one of the embodiments of the first aspect described above, the premixing method comprising the following steps: Place the suction pipe tray on the weighing forklift and zero the weight of the weighing forklift. Insert the suction pipe into the powder container to suction the powder in the powder container into the vibrating demagnetizer; After being demagnetized by a vibrating demagnetizer, the powder enters the receiving space of the premixing tank. The air in the receiving space is filtered by a premixing filter backflush device and then discharged. A weighing forklift is used to weigh the powder in the premixing tank to ensure that the powder weight of each material is qualified. Once all types of powder have been fed into the tank, the premixing tank is turned on, and the powder in the tank is premixed using the stirring paddle.

[0016] In a preferred embodiment, it further includes: After premixing is completed, a weighing forklift will deliver the premixing tank to the top of the mixer feed inlet for feeding. Open the isolation switch of the premixing tank and the feed port of the mixer, control the bottom plate of the tank to open to release the powder in the tank into the internal space of the mixer, and at the same time open the premixing filter backflushing device to provide positive pressure for backflushing; The powder enters the internal space of the mixer, and the air in the internal space is filtered through the mixing filter backflush device and then discharged. After the weighing forklift reaches zero, close the isolation switch of the premixing tank and stop feeding. After turning on the mixing filter backflushing device for backflushing, close the feed inlet of the mixer to complete the transfer of the premixed powder for subsequent processes.

[0017] Compared to existing technologies, the powder feeding, demagnetizing, and premixing equipment and method provided by this invention, wherein the premixing tank is located on a weighing forklift, the premixing tank includes a tank body and a stirring paddle, the tank body has a receiving space, the stirring paddle is set inside the receiving space of the tank body, the premixing filter backflush is set outside the tank body and is connected to the receiving space, the vibrating demagnetizer is set on the tank body and is connected to the receiving space, one end of the suction pipe is connected to the vibrating demagnetizer, and the other end of the suction pipe is used to insert into the powder container to suck the powder in the powder container into the vibrating demagnetizer and then into the premixing tank, which can reduce dust, improve the production environment, reduce magnetic foreign objects in the powder, ensure the consistency of subsequent voltage, improve the accuracy of feeding weight, avoid the problem of ratio imbalance, improve product quality, realize dry powder premixing, and improve production efficiency. [Attached Image Description] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 The structural diagram of the powder feeding, demagnetizing, and premixing equipment provided by the present invention is shown.

[0020] Figure 2 The structural diagram of the mixer in the powder feeding, demagnetizing, and premixing equipment provided by the present invention.

[0021] Figure 3 The flowchart of the powder feeding, demagnetization, and premixing method provided by the present invention.

Detailed Implementation Methods

[0023] Please see Figure 1 This is a structural diagram of the powder feeding, demagnetizing, and premixing device provided by the present invention. The powder feeding, demagnetizing, and premixing device provided by the present invention solves the problem of raw material scattering caused by existing powder feeding methods, can remove magnetic foreign objects from raw materials, and adds a weighing system to ensure feeding accuracy. The addition of a premixing tank to premix the raw materials can improve the overall mixing efficiency and increase the utilization rate of the mixer.

[0024] The powder feeding, demagnetizing, and premixing equipment 100 provided by the present invention includes a weighing forklift 10, a premixing tank 20, a premixing filter backflushing device 30, a vibrating demagnetizer 40, and a suction pipe 50. The premixing tank 20 is located on the weighing forklift 10. The premixing tank 20 includes a tank body 21 and a stirring paddle 22. The tank body 21 has a receiving space 210, and the stirring paddle 22 is disposed within the receiving space 210. The premixing filter backflushing device 30 is disposed outside the tank body 21 and communicates with the receiving space 210. The vibrating demagnetizer 40 is disposed on the tank body 21 and communicates with the receiving space 210. One end of the suction pipe 10 is connected to the vibrating demagnetizer 40, and the other end of the suction pipe 10 is inserted into a powder container to draw powder from the powder container into the vibrating demagnetizer 40 and then into the premixing tank 20.

[0025] Specifically, in this invention, one end of the suction pipe 10 is connected to the vibratory demagnetizer 40, and the other end of the suction pipe 10 is inserted into the powder container. This allows the powder in the powder container to be suctioned into the vibratory demagnetizer 40, employing a positive pressure suction principle to transport the raw powder material through the pipe to the vibratory demagnetizer 40 and the premixing tank 20. This avoids the dust problem caused by traditional manual or gravity feeding. After the powder is transported to the vibratory demagnetizer 40, the vibratory demagnetizer 40 removes magnetic substances from the powder. By installing the vibratory demagnetizer 40 at the end of the powder suction pipe 50, magnetic substances in the raw material are adsorbed, preventing them from entering the premixing tank 20. This increases subsequent voltage consistency, improves the content of magnetic foreign matter in the powder, and ensures feeding efficiency. The powder, demagnetized by the vibratory demagnetizer 40, enters the premixing tank 20. Air generated during the process can be filtered and discharged through the premixed filter backflush unit 30, further preventing dust from escaping. Furthermore, a weighing forklift 10 with weighing function is installed below the premixed mixing tank 20. The weighing forklift 10 weighs the powder material inside the premixed mixing tank 20, enabling precise control of the feeding weight and preventing imbalances in the proportions. After all types of powder materials are fed into the premixed mixing tank 30, the mixing function can be activated. The propeller 22 stirs and disperses the mixed powder in the tank 21, thus performing premixing. Premixing reduces the working time of subsequent mixers and improves production efficiency. It is understood that subsequent material transfer for final mixing is necessary. During material transfer, the premixed filter backflush unit 30 provides positive pressure through backflushing, improving material transfer efficiency and further enhancing production efficiency.

[0026] Therefore, the powder feeding, demagnetizing, and premixing equipment 100 provided by the present invention includes a premixing tank 20 located on a weighing forklift 10. The premixing tank 20 includes a tank body 21 and a stirring paddle 22. The tank body 21 has a receiving space 210. The stirring paddle 22 is disposed within the receiving space 210 of the tank body 21. A premixing filter backflushing device 30 is disposed outside the tank body 21 and is connected to the receiving space 210. A vibrating demagnetizer 40 is disposed on the tank body 21 and is connected to the receiving space 210. One end of the suction pipe 10 is connected to the vibrating demagnetizer 40, and the other end of the suction pipe 10 is used to insert into a powder container to suck the powder in the powder container into the vibrating demagnetizer 40 and then into the premixing tank 20. This can reduce dust, improve the production environment, reduce magnetic foreign matter in the powder, ensure the consistency of subsequent voltage, improve the accuracy of feeding weight, avoid the problem of unbalanced ratio, improve product quality, realize dry powder premixing, and improve production efficiency.

[0027] The weighing forklift 10 includes a platform 11, several wheels 12, and a handle 13. The wheels 12 are located below the platform 11, and the handle 13 is connected to one end of the platform 11. The tank 21 is located on the platform 11. Specifically, the platform 11 is flat and can support the premixing tank 20. The wheels 12 are located at the bottom of the platform 11. The rotation of the wheels 12 can drive the platform 11, facilitating the relocation of the mixing tank 20 for feeding. The handle 13 is connected to one end of the platform 11, facilitating the pushing and pulling of the weighing forklift 10.

[0028] The premixing tank 20 includes a tank body 21 and a stirring paddle 22. Understandably, the stirring paddle 22 rotates inside the tank body 21, which enables the premixing of powders within the receiving space 210 of the tank body 21, reducing the working time of the subsequent mixer and improving production efficiency.

[0029] The tank body 21 includes a top plate 211, a bottom plate 212, and side plates 213 disposed between the top plate 211 and the bottom plate 212. The top plate 211, bottom plate 212, and side plates 213 enclose the receiving space 210, which is used to receive various material powders. The shape of the tank body 21 can be, for example, a cylinder, a rectangle, etc. Correspondingly, the number of side plates 213 can be one or four, that is, the number of side plates 213 can be one or more, which is not limited in this invention. Specifically, the bottom plate 212 is connected to an isolation switch 214, which is used to control the bottom plate 212 to open to release the powder in the tank body 21. For example, the bottom plate 212 can be provided with a partition that extends out of the platform 11 of the weighing forklift 10. When the isolation switch 214 is pressed, the partition can be pulled out to form a discharge port and release the powder. After the discharge is completed, the partition can be manually reset.

[0030] The premixed filter backflushing device 30 includes a filter pipe 31 and a blowing device 32. One end of the filter pipe 31 is connected to the side plate 213, and the other end is connected to the blowing device 32. A double-layer filter screen 311 is provided on the filter pipe 31. Understandably, when powder enters the premixing tank 20, air during the feeding process can enter the filter pipe 31, be filtered by the filter screen 311, and then discharged, facilitating feeding. The filter screen 311 can also suppress dust emissions, further preventing dust pollution. Specifically, an isolation switch can be installed on the filter pipe 31. When air needs to be discharged, the isolation switch is opened; after the air is discharged, the isolation switch is closed to ensure the tank's sealing. When powder needs to be discharged from the premixing tank 20, the blowing device 32 can provide positive pressure, facilitating material transfer within the premixing tank 20 for subsequent mixing, thus improving feeding efficiency.

[0031] The vibration demagnetizer 40 is installed on the top plate 211. The vibration demagnetizer 40 includes a demagnetizing component 41 that can adsorb magnetic materials. Specifically, the demagnetizing component 41 can be a magnet or a coil that can generate a magnetic field when energized. The magnetic field of the demagnetizing component 41 can adsorb magnetic materials in the powder, remove magnetic foreign objects, and ensure the voltage consistency of the battery cells subsequently manufactured.

[0032] The suction pipe 50 is used to transport powder. It can be connected to a drive device such as a motor to provide suction power. The suction pipe 50 includes a connecting pipe 51 and a conveying pipe 52. One end of the connecting pipe 51 is connected to a vibration demagnetizer 40, and the other end is connected to the conveying pipe 52. The end of the conveying pipe 52 away from the connecting pipe 51 is used to insert into a powder container for various materials, such as a ton bag. Specifically, the connecting pipe 51 can be a rigid pipe for easy connection, while the conveying pipe 52 can be a flexible hose for easy insertion into various powder containers.

[0033] Please see Figure 2 This is a structural diagram of the mixer in the powder feeding, demagnetizing, and premixing equipment provided by the present invention. In another embodiment of the present invention, the powder feeding, demagnetizing, and premixing equipment 100 further includes a mixer 60, which includes a body 61 and an upper cover plate 62. The body 61 has an internal space 610, and the upper cover plate 62 is disposed at one end of the body 61. The upper cover plate 62 can seal the internal space 610, and the upper cover plate 62 can be opened to allow the internal space 610 of the mixer 60 to communicate with the receiving space 210 of the tank 21. A stirring filter backflushing device 70 is provided on one side of the body 61, and the stirring filter backflushing device 70 communicates with the internal space 610 of the mixer. Specifically, the upper cover plate 62 may be provided with a partition, which can be controlled by an isolation switch. When the isolation switch is pressed, the partition can be pulled away to form a feed inlet to receive powder. After feeding is completed, the partition can be manually reset.

[0034] The mixing filter backflush unit 70 has the same structure as the premixed filter backflush unit 30. Understandably, when the powder enters the mixer 60, the air in the feeding process can be filtered and discharged through the mixing filter backflush unit 70, which can suppress dust from flying out and facilitate feeding. After feeding is completed, the mixing filter backflush unit 70 can perform backflush to further avoid dust.

[0035] The powder feeding, demagnetizing, and premixing equipment provided by this invention employs a weighing forklift in conjunction with a premixing tank and a slurry suction and vibration demagnetizing system to control the weight of powder materials in the early stages, perform dry powder premixing, and demagnetize the powder; a double-layer filtration and back-flushing system is used to control dust. In practical application, the specific steps include: before operation, placing the suction pipe tray on the weighing forklift and zeroing the forklift weight; inserting the suction pipe into a ton bag or other type of powder container and turning on the control switch to begin the suction operation; the suction powder passes through the suction pipe, through the vibration demagnetizer, and into the premixing tank, while air is discharged through the double-layer premixing filter back-flushing system; observing the weight using the weighing forklift to ensure it is within acceptable limits; once production and quality control personnel confirm that the weight of one type of powder is acceptable, the next type of material is suctioned until all required powders have been suctioned; then, turning on the power to activate the premixing tank's premixing function and setting the premixing time according to the ingredient list requirements; after premixing is complete, weighing is performed... The forklift moves the premixing tank above the feed inlet of the mixer to be fed, ready to deliver material. The premixing tank at the top opens its bottom plate isolation switch and simultaneously activates the premixing filter backflushing device to provide positive pressure. The mixer at the bottom opens its feed isolation switch and the isolation switch of the mixing filter backflushing device to receive material from above. After the powder enters the mixer, air is expelled through the mixing filter backflushing device. Once the forklift's weight reaches zero, the feeding is stopped. Finally, the mixing filter backflushing device is activated for backflushing, and the feed channel isolation switch and the isolation switch of the mixing filter backflushing device are closed to ensure all material enters the tank. Subsequent operations (such as adding solvent and mixing) are then performed according to the feeding schedule. These operations help reduce dust, minimize magnetic foreign matter in the powder, improve the accuracy of the feeding weight, enhance the dry mixing function of the powder, improve the production environment, improve product quality, and increase the utilization rate of the mixer.

[0036] The powder feeding, demagnetizing, and premixing equipment provided by this invention forms a semi-automatic feeding system by combining powder suction and conveying with vibration demagnetization into a mixing tank and a weighing forklift. The powder vibration demagnetizer improves the content of magnetic foreign matter in the powder and ensures feeding efficiency, while the weighing forklift ensures accurate powder weight. The premixing tank provides a pre-dry mixing function, which improves the efficiency of the mixer below.

[0037] Please see Figure 3 The present invention also provides a premixing method for the powder feeding and demagnetizing premixing equipment according to any one of the above embodiments, the premixing method comprising the following steps: Step S10: Place the suction pipe tray on the weighing forklift and zero the weight of the weighing forklift. Step S20: Insert the suction pipe into the powder container to suction the powder in the powder container into the vibrating demagnetizer; Step S30: After the powder is demagnetized by the vibrating demagnetizer, it enters the receiving space of the premixing tank. The air in the receiving space is filtered by the premixing filter backflush device and then discharged. Step S40: The weighing forklift weighs the powder in the premixing tank to ensure that the powder weight of each material is qualified. Step S50: When all types of powder have been fed, turn on the premixing tank and premix the powder in the tank using the stirring paddle.

[0038] In some implementations, after step S50, the following steps are also included: After premixing is completed, a weighing forklift will deliver the premixing tank to the top of the mixer feed inlet for feeding. Open the isolation switch of the premixing tank and the feed port of the mixer, control the bottom plate of the tank to open to release the powder in the tank into the internal space of the mixer, and at the same time open the premixing filter backflushing device to provide positive pressure for backflushing; The powder enters the internal space of the mixer, and the air in the internal space is filtered through the mixing filter backflush device and then discharged. After the weighing forklift reaches zero, close the isolation switch of the premixing tank and stop feeding. After turning on the mixing filter backflushing device for backflushing, close the feed inlet of the mixer to complete the transfer of the premixed powder for subsequent processes.

[0039] It should be noted that all embodiments of the powder feeding demagnetization premixing equipment provided by the present invention are applicable to the premixing method based on the powder feeding demagnetization premixing equipment provided by the present invention, and can achieve the same / similar technical effects, which will not be elaborated here.

[0040] In summary, the powder feeding, demagnetizing, and premixing equipment 100 and premixing method provided by this invention include a premixing tank 20 located on a weighing forklift 10. The premixing tank 20 includes a tank body 21 and a stirring paddle 22. The tank body 21 has a receiving space 210, and the stirring paddle 22 is disposed within the receiving space 210 of the tank body 21. A premixing filter backflushing device 30 is disposed outside the tank body 21 and communicates with the receiving space 210. A vibration demagnetizer 40 is disposed on the tank body 21 and performs vibration demagnetization. The device 40 is connected to the receiving space 210. One end of the suction pipe 10 is connected to the vibrating demagnetizer 40, and the other end of the suction pipe 10 is used to insert into the powder container to suck the powder in the powder container into the vibrating demagnetizer 40 and then into the premixing tank 20. This can reduce dust, improve the production environment, reduce magnetic foreign objects in the powder, ensure the consistency of subsequent voltage, improve the accuracy of feeding weight, avoid the problem of unbalanced ratio, improve product quality, realize dry powder premixing, and improve production efficiency.

[0041] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A powder feeding and de-magnetizing premixing apparatus, characterized by, The application relates to a premixing device which comprises a weighing forklift, a premixing stirring tank, a premixing filtering back-blowing device, a vibration demagnetizer and a suction pipeline, wherein the premixing stirring tank is arranged on the weighing forklift, the premixing stirring tank comprises a tank body and a stirring paddle, the tank body has a containing space, the stirring paddle is arranged in the containing space of the tank body, the premixing filtering back-blowing device is arranged outside the tank body and is communicated with the containing space, the vibration demagnetizer is arranged on the tank body and is communicated with the containing space, one end of the suction pipeline is connected with the vibration demagnetizer, and the other end of the suction pipeline is used for being inserted into a powder container so as to suck the powder in the powder container into the vibration demagnetizer and then into the premixing stirring tank.

2. The powder feeding and de-magnetizing premixing apparatus according to claim 1, wherein The tank body comprises a top plate, a bottom plate and a side plate arranged between the top plate and the bottom plate, and the top plate, the bottom plate and the side plate surround the containing space.

3. The powder feeding and de-magnetizing premixing apparatus according to claim 2, wherein The premixing filtering back-blowing device is arranged on the side plate and close to the top plate, the premixing filtering back-blowing device comprises a filtering pipeline and a blowing device, one end of the filtering pipeline is connected with the side plate, the other end of the filtering pipeline is connected with the blowing device, and double-layer filtering screens are arranged on the filtering pipeline.

4. The powder feeding and de-magnetizing premixing apparatus according to claim 2, wherein The vibration demagnetizer is arranged on the top plate, and the vibration demagnetizer comprises a demagnetization element used for adsorbing magnetic substances.

5. The powder feeding and de-magnetizing premixing apparatus according to claim 2, wherein The bottom plate is connected with a partition switch, and the partition switch is used for controlling the bottom plate to be opened to release the powder in the tank body.

6. The powder feeding and de-magnetizing premixing apparatus according to claim 1, wherein The suction pipeline comprises a connecting pipeline and a conveying pipeline, one end of the connecting pipeline is connected with the vibration demagnetizer, the other end of the connecting pipeline is connected with the conveying pipeline, and the end of the conveying pipeline away from the connecting pipeline is used for being inserted into a powder container of various powder materials.

7. The powder feeding and de-magnetizing premixing apparatus according to claim 1, wherein The weighing forklift comprises a plate, a plurality of wheels and a handle, the plurality of wheels are arranged below the plate, one end of the handle is connected with the plate, and the tank body is arranged on the plate.

8. The powder feeding and de-magnetizing premixing apparatus according to any one of claims 1 to 7, wherein The premixing device further comprises a mixer which comprises a body and an upper cover plate, the body has an internal space, the upper cover plate is arranged at one end of the body, the upper cover plate can seal the internal space, the upper cover plate can be opened to make the internal space of the mixer communicated with the containing space of the tank body, and a stirring filtering back-blowing device is arranged on one side of the body and communicated with the internal space.

9. A premixing method based on the powder feeding and demagnetizing premixing apparatus according to any one of claims 1 to 8, characterized by, The premixing method comprises the following steps: placing the suction pipeline disc on the weighing forklift and returning the weight of the weighing forklift to zero; inserting the suction pipeline into the powder container to suck the powder in the powder container into the vibration demagnetizer; after the powder is demagnetized by the vibration demagnetizer, the powder enters the containing space of the tank body of the premixing stirring tank, and the air in the containing space is filtered by the premixing filtering back-blowing device and then discharged; the weighing forklift weighs the powder in the premixing stirring tank to ensure that the weight of the powder of each material is qualified; when the powder of all kinds of materials is sucked, the premixing stirring tank is opened, and the powder in the premixing stirring tank is premixed by the stirring paddle.

10. The premixing method of claim 9, wherein, The premixing device further comprises: after the premixing is completed, the weighing forklift sends the premixing stirring tank to the feeding port of the mixer to feed. Open the partition switch of the premixing stirring tank and the feeding port of the stirrer, control the bottom plate of the tank to open to release the powder in the tank into the internal space of the stirrer, and open the premixing filter backflusher to provide positive pressure by backflushing; The powder enters the internal space of the stirrer, and the air in the internal space is filtered by the stirring filter backflusher and discharged; After the weight of the forklift is zeroed, close the partition switch of the premixing stirring tank and stop feeding; After opening the stirring filter backflusher to backflush, close the feeding port of the stirrer, complete the transfer of the premixed powder, and then proceed to the subsequent process.

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