High-precision powder automatic batching system and method for lithium battery materials

Abstract

The application provides a high-precision powder automatic batching system and method for lithium battery materials. A dust-free feeding station feeds coarse filling hoppers and supplementary filling hoppers. A plurality of powder bottles are sequentially transported to the bottom of the coarse filling hoppers and the supplementary filling hoppers. The powder is received from the coarse filling hoppers and supplemented from the supplementary filling hoppers. The powder amount entering the powder bottles is controlled according to the coarse filling weighing mechanism and the supplementary filling weighing mechanism. The screw of the coarse filling hopper and the supplementary filling hopper is used to assist in discharging. The feeding amount is controlled through fast feeding and slow feeding until the predetermined weight is reached, and the batching is completed. The whole process adopts a full-automatic dispensing method, and high-precision powder dispensing and batching are realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automatic batching systems, and particularly relates to a high-precision powder automatic batching system and method for lithium battery materials. BACKGROUND

[0002] The lithium battery positive electrode material industry is developing rapidly. However, in the production and preparation process of lithium battery positive electrode materials, the batching of powder materials is still mainly manual operation. The operation efficiency and the stability of the batching precision cannot meet the development needs of the industry. Moreover, the dust is easy to rise during the manual sub-packaging operation of the powder materials, and the risk of occupational hazards is high in the long-term operation in this environment.

[0003] In the production and preparation process of lithium battery positive electrode materials, the batching of small powder materials is difficult to achieve high-precision automatic sub-packaging because of the high material ratio precision requirement (±0.5g), and the characteristics of the powder materials such as small particle size, poor flowability, strong water absorption and easy adhesion and caking. Therefore, the industry generally uses manual operation for sub-packaging and batching. It is difficult to achieve high batching precision requirement by manual sub-packaging. Moreover, the manual sub-packaging has low efficiency, no foolproof and mistake-proof measures, and the batching precision stability is greatly affected by human subjective factors. At present, the products with batching quantitative over-difference are required to be strictly controlled, and there is no mature equipment on the market that can completely match the process requirements to realize full-automatic batching production.

[0004] Therefore, how to overcome the above technical defects is a problem to be solved by those skilled in the art. SUMMARY

[0005] The application aims to provide a high-precision powder automatic batching system and method for lithium battery materials, which realizes high-precision powder sub-packaging and batching by using full-automatic sub-packaging mode.

[0006] To solve the above technical problems, the application provides a high-precision powder automatic batching system for lithium battery materials, which comprises:

[0007] A conveying and temporary storage system adopts a belt conveying line to convey powder bottles;

[0008] A feeding platform, a dust-free feeding station, a coarse filling bin, a coarse filling weighing mechanism, a supplementary material filling bin and a supplementary material filling weighing mechanism;

[0009] A work advancing mechanism is used to transfer the powder bottles to different stations;

[0010] The dust-free feeding station is arranged on the feeding platform, and the dust-free feeding station, the rough filling bin, the rough filling weighing mechanism, the supplementary filling bin and the supplementary filling weighing mechanism form a set of filling devices, the number of the filling devices is consistent with the number of the required types of powder, a plurality of sets of the filling devices are arranged in sequence along the conveying direction of the belt conveying line, the outlets of the dust-free feeding station are respectively connected with the inlets of the rough filling bin and the inlets of the supplementary filling bin, the outlets of the rough filling bin and the outlets of the supplementary filling bin are used for feeding the powder bottles on the belt conveying line, the rough filling weighing mechanism is used for weighing the powder bottles after rough filling, the supplementary filling weighing mechanism is used for weighing the powder bottles after supplementary filling, and the work feeding mechanism is used for transferring the powder bottles after rough filling between the belt conveying line and the rough filling weighing mechanism and transferring the powder bottles after supplementary filling between the belt conveying line and the supplementary filling weighing mechanism.

[0011] The rough filling bin and the supplementary filling bin are provided with a screw and a stirring device, a driving mechanism is arranged on the rough filling bin and the supplementary filling bin, and the driving mechanism is used for driving the screw and the stirring device to rotate. The outlets of the rough filling bin and the supplementary filling bin are provided with a leak stop device.

[0012] Optionally, in the high-precision powder automatic batching system for lithium battery materials, the system further comprises:

[0013] An automatic bottle arranging machine is arranged for arranging empty powder bottles in a row.

[0014] An automatic bottle cleaning machine is arranged for cleaning the inside of the powder bottles.

[0015] An automatic cap screwing machine is arranged for screwing the bottle cap.

[0016] A finished product temporary storage platform is arranged.

[0017] The powder bottles are output by the automatic bottle arranging machine, and sequentially pass through the automatic bottle cleaning machine, the rough filling bin, the supplementary filling bin, the automatic cap screwing machine and the finished product temporary storage platform along the belt conveying line.

[0018] Optionally, in the high-precision powder automatic batching system for lithium battery materials, the automatic bottle arranging machine comprises:

[0019] A first rack is arranged.

[0020] A rotating disc is rotatably arranged on the first rack and is used for placing empty powder bottles.

[0021] A guide plate is arranged to form a guide channel which is in communication with the inside and outside of the rotating disc respectively, and is used to guide the powder bottles into the guide channel and then to the next process.

[0022] A rotating disc driving device is arranged to drive the rotating disc.

[0023] Optionally, in the high-precision powder automatic batching system for lithium battery materials, the guide plate comprises:

[0024] A surrounding plate is arranged at the periphery of the rotating disc and is fixedly connected with the first rack.

[0025] A side plate is arranged to surround the guide channel with the inner wall of the surrounding plate.

[0026] An intermediate plate is arranged to push the powder bottles to the side close to the surrounding plate.

[0027] Optionally, in the high-precision powder automatic batching system for lithium battery materials, the automatic bottle cleaning machine comprises:

[0028] A second rack and a machine cover are arranged, the machine cover is arranged on the belt conveying line at the outlet of the automatic bottle cleaning machine to form a working cavity.

[0029] A bottle blowing device is arranged to blow the powder bottles.

[0030] A bottle clamping and overturning mechanism is arranged to clamp the powder bottles on the belt conveying line and overturn them to the bottle blowing device.

[0031] Optionally, in the high-precision powder automatic batching system for lithium battery materials, the automatic bottle cleaning machine further comprises a first dust removal device arranged to establish a negative pressure in the cavity of the machine cover.

[0032] Optionally, in the high-precision powder automatic batching system for lithium battery materials, the dust-free feeding station comprises a feeding station body, a feeding port cover, a foreign matter prevention permanent magnetic grid device, a second dust removal device, a multi-petal butterfly valve and a flexible connection, the feeding port cover is reversibly arranged at the inlet of the feeding station body, the multi-petal butterfly valve and the flexible connection are sequentially arranged at the outlet of the feeding station body, the foreign matter prevention permanent magnetic grid device is arranged on the channel of the feeding station body, and the second dust removal device is arranged to establish a negative pressure in the cavity of the feeding station body.

[0033] Optionally, in the high-precision powder automatic batching system for lithium battery materials, the automatic cap sorting and screwing machine comprises a cap warehouse, a cap sorting lifting device, a cap hanging mechanism, a servo screwing device and a positioning clamping mechanism, the cap hanging mechanism is arranged to take the caps from the cap warehouse by the cap sorting lifting device and place them on the powder bottles, the positioning clamping mechanism is arranged to clamp the powder bottles with the caps, and the servo screwing device is arranged to tighten the caps.

[0034] Optionally, in the high-precision powder automatic batching system for lithium battery materials, an online printing and labeling machine is further arranged between the automatic cap screwing machine and the finished product temporary storage platform.

[0035] The application also provides a high-precision powder automatic batching method for lithium battery materials, which uses the high-precision powder automatic batching system for lithium battery materials described above, and the method comprises the following steps:

[0036] Step 1: the dust-free feeding station feeds the coarse filling hopper and the supplementary filling hopper respectively until the material level of the coarse filling hopper and the supplementary filling hopper meets the filling condition, and the coarse filling weighing mechanism automatically resets to zero.

[0037] Step 2: the leakage stop device of the coarse filling hopper is opened, the screw of the coarse filling hopper is started to quickly feed until the coarse filling is disconnected, the screw of the coarse filling hopper is started to slowly feed until the target filling amount is reached, the screw of the coarse filling hopper is stopped, the leakage stop device of the coarse filling hopper is closed, and the work feeding mechanism transports the powder bottle to the supplementary filling position.

[0038] Step 3: the supplementary filling weighing mechanism re-checks whether the one-time filling amount is out of tolerance, when it is out of tolerance, the work feeding mechanism transports the powder bottle to the bottle outlet position; when it is not out of tolerance, the supplementary filling weighing mechanism determines the supplementary filling amount, and when the supplementary filling amount is less than the minimum filling amount, step 4 is entered, and when the supplementary filling amount is greater than the minimum filling amount, the leakage stop device of the supplementary filling hopper is opened, the screw of the supplementary filling hopper is started to quickly feed until the supplementary filling minimum amount is disconnected.

[0039] Step 4: the screw of the supplementary filling hopper is started to slowly feed until the final target filling amount is reached, the screw of the supplementary filling hopper is stopped, the leakage stop device of the supplementary filling hopper is closed, and the supplementary filling weighing mechanism self-checks whether the filling amount is out of tolerance, when it is out of tolerance, the powder bottle is rejected, and when it is not out of tolerance, the work feeding mechanism transports the powder bottle to the bottle outlet position.

[0040] The application provides a high-precision powder automatic batching system for lithium battery materials, which has the following beneficial effects:

[0041] The dust-free feeding station feeds the coarse filling hopper and the supplementary filling hopper, a plurality of powder bottles are transported to the bottom of the coarse filling hopper and the supplementary filling hopper in turn, powder is fed from the coarse filling hopper and the supplementary filling hopper, the powder amount entering the powder bottle is controlled according to the coarse filling weighing mechanism and the supplementary filling weighing mechanism, the screw of the coarse filling hopper and the supplementary filling hopper is used to assist in discharging, the feeding amount is controlled through quick feeding and slow feeding until the predetermined weight is reached, and the batching is completed. The whole process adopts a full-automatic dispensing method, and high-precision powder dispensing and batching are realized. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0043] Figure 1 A structure schematic diagram of a high-precision powder automatic batching system for lithium battery materials is provided for the embodiments of the present application.

[0044] Figure 2 A process flow diagram of a high-precision powder automatic batching system for lithium battery materials is provided for the embodiments of the present application.

[0045] Figure 3 A system diagram of a high-precision powder automatic batching method for lithium battery materials is provided for the embodiments of the present application.

[0046] Figure 4 A structure schematic diagram of an automatic bottle sorting machine is provided for the embodiments of the present application.

[0047] Figure 5 A structure schematic diagram of an automatic bottle cleaning machine is provided for the embodiments of the present application.

[0048] Figure 6 A structure schematic diagram of a dust-free feeding station is provided for the embodiments of the present application.

[0049] Figure 7 A structure schematic diagram of a double-head powder filling machine is provided for the embodiments of the present application.

[0050] Figure 8 A sectional view of a double-head powder filling machine is provided for the embodiments of the present application.

[0051] Figure 9 A structure schematic diagram of an automatic cap sorting and capping machine is provided for the embodiments of the present application.

[0052] Figure 10 An online printing and labeling machine is provided for the embodiments of the present application.

[0053] In the above drawings:

[0054] 1 - automatic bottle sorting machine; 2 - automatic bottle cleaning machine; 3 - centralized dust removal system; 4 - A material dust-free feeding station; 5 - B material dust-free feeding station; 6 - C material dust-free feeding station; 7 - feeding platform; 8 - A material rough filling bin; 9 - A material rough filling weighing mechanism; 10 - A material supplement filling bin; 11 - A material supplement filling weighing mechanism; 12 - B material rough filling bin; 13 - B material rough filling weighing mechanism; 14 - B material supplement filling bin; 15 - B material supplement filling weighing mechanism; 16 - C material rough filling bin; 17 - C material rough filling weighing mechanism; 18 - C material supplement filling bin; 19 - C material supplement filling weighing mechanism; 20 - automatic cap sorting and capping machine; 21 - online printing and labeling machine; 22 - conveying and temporary storage system; 23 - finished product temporary storage platform; 24 - first rack; 25 - turntable; 261 - surrounding plate; 262 - side plate; 263 - middle plate; 27 - turntable driving device; 28 - second rack; 29 - machine cover; 30 - first dust removal device; 31 - bottle blowing device; 32 - bottle clamping and overturning mechanism; 33 - flexible connection; 34 - flow assisting device; 35 - feeding station main body; 36 - second dust removal device; 37 - feeding port cover; 38 - foreign matter prevention permanent magnetic grid device; 39 - multi-petal butterfly valve for discharging; 40 - driving mechanism; 41 - third dust removal device; 42 - screw; 43 - stirring device; 44 - leak stopping device; 45 - cap bin; 46 - cap sorting and lifting device; 47 - cap lowering groove; 48 - cap hanging mechanism; 49 - servo capping device; 50 - positioning and clamping mechanism; 51 - labeling machine main machine; 52 - online code spraying device; 53 - labeling device; 54 - label brushing device. DETAILED DESCRIPTION

[0055] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar elements or elements having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended only to explain the present application, and cannot be understood as limiting the present application.

[0056] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the indicated device or element to have a particular orientation, to be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0057] In the description of the present application, the meaning of multiple is more than two, if the first, second is described only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0058] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0059] The core of the present application is to provide a kind of about lithium battery material High-precision powder automatic batching system and method, adopt full-automatic subpackaging mode, realize powder high-precision subpackaging.

[0060] In order for those skilled in the art to better understand the technical solutions provided by the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0061] Specifically, please refer to Figures 1-10 , Figure 1 The structure diagram of a kind of about lithium battery material High-precision powder automatic batching system provided by the embodiment of the present application; Figure 2 The process flow diagram of a kind of about lithium battery material High-precision powder automatic batching system provided by the embodiment of the present application; Figure 3 The system diagram of a kind of about lithium battery material High-precision powder automatic batching method provided by the embodiment of the present application; Figure 4 The structure diagram of automatic bottle sorting machine provided by the embodiment of the present application; Figure 5 The structure diagram of automatic bottle cleaning machine provided by the embodiment of the present application; Figure 6 The structure diagram of dust-free feeding station provided by the embodiment of the present application; Figure 7 The structure diagram of double-head powder filling machine provided by the embodiment of the present application; Figure 8 The sectional view of double-head powder filling machine provided by the embodiment of the present application; Figure 9 The structure diagram of automatic cap sorting and capping machine provided by the embodiment of the present application; Figure 10 Online printing and labeling machine provided by the embodiment of the present application.

[0062] A kind of about lithium battery material High-precision powder automatic batching system provided by the present application, it include: conveying temporary storage system 22, work mechanism, feeding platform 7, dust-free feeding station, coarse filling bin, coarse filling weighing mechanism, make-up filling bin and make-up filling weighing mechanism.

[0063] The conveying and temporary storage system 22 uses a belt conveying line as a conveying mechanism, and is used for material buffering and conveying connection between devices, and is used for sequentially performing designated operations on the powder bottle along each part of the production line.

[0064] The dust-free feeding station is arranged on the feeding platform 7, and the dust-free feeding station, the rough filling bin, the rough filling weighing mechanism, the supplementary filling bin, and the supplementary filling weighing mechanism constitute a set of filling devices, and the number of the filling devices is consistent with the number of the types of powder required. A plurality of sets of the filling devices are arranged in sequence along the conveying direction of the belt conveying line. In each set of the filling devices: the outlets of the dust-free feeding stations are respectively connected with the inlets of the rough filling bins and the inlets of the supplementary filling bins, the outlets of the rough filling bins and the outlets of the supplementary filling bins are used for feeding the powder bottles on the belt conveying line, the rough filling weighing mechanism is used for weighing the powder bottles after rough filling, the supplementary filling weighing mechanism is used for weighing the powder bottles after supplementary filling, and the work advancing mechanism is used for transferring the powder bottles after rough filling between the belt conveying line and the rough filling weighing mechanism, and transferring the powder bottles after supplementary filling between the belt conveying line and the supplementary filling weighing mechanism. The work advancing mechanism can be an intelligent mechanical arm.

[0065] The rough filling bin and the supplementary filling bin are both internally provided with a screw 42 and a stirring device 43, and the rough filling bin and the supplementary filling bin are both provided with a driving mechanism 40, and the driving mechanism 40 is used for driving the screw 42 and the stirring device 43 to rotate. In particular, the stirring device 43 can be connected to the screw 42, and the driving mechanism 40 only needs to drive any one of the screw 42 and the stirring device 43 to realize the rotation of both. The outlets of the rough filling bin and the supplementary filling bin are both provided with a leak stop device 44, and the leak stop device 44 realizes the opening and closing of the outlet channel through a leak stop shutter. Specifically, the stirring device 43 is a scraper, the scraper is close to the bin wall (there is a certain gap between the scraper and the bin wall), and the scraper rotates with the screw 42 to stir and loosen the accumulated material on the bin wall.

[0066] The high-precision powder automatic batching system for lithium battery materials provided in the case is used for feeding the rough filling bin and the supplementary filling bin from the dust-free feeding station, a plurality of powder bottles are sequentially conveyed to the bottom of the rough filling bin and the supplementary filling bin, the powder is fed from the rough filling bin and the supplementary filling bin, the amount of the powder entering the powder bottles is controlled according to the rough filling weighing mechanism and the supplementary filling weighing mechanism, the screw of the rough filling bin and the supplementary filling bin is used for assisting the discharging, the feeding amount is controlled through fast feeding and slow feeding, until the predetermined weight is reached, and the batching is completed. The whole process adopts a full-automatic sub-packaging mode, and high-precision sub-packaging and batching of the powder are realized.

[0067] The case also includes an automatic bottle sorting machine 1, an automatic bottle cleaning machine 2, an automatic cap sorting and capping machine 20, and a finished product temporary storage platform 23.

[0068] The automatic bottle arranging machine 1 is used for arranging empty powder bottles in a row and conveying them to the next process in sequence.

[0069] The automatic bottle cleaning machine 2 is used for blowing and cleaning the inside of the powder bottles to eliminate foreign matters in the bottles.

[0070] The automatic cap arranging and screwing machine 20 is used for screwing the bottle caps.

[0071] The powder bottles are conveyed along the belt conveying line through the automatic bottle cleaning machine 2, the rough filling bin, the supplementary filling bin, the automatic cap arranging and screwing machine 20 and the finished product temporary storage platform 23 in sequence after being output from the automatic bottle arranging machine 1.

[0072] The empty powder bottles are arranged in a row by the automatic bottle arranging machine 1, enter the belt conveying line one by one and are conveyed to the automatic bottle cleaning machine 2 to clean the inside of the bottles, and then are conveyed to the bottom of the rough filling bin and the supplementary filling bin, respectively, and the rough filling bin and the supplementary filling bin are filled by the dust-free feeding station, the powder bottles are filled with powder from the rough filling bin and the supplementary filling bin, the amount of powder entering the powder bottles is controlled according to the rough filling weighing mechanism and the supplementary filling weighing mechanism until the predetermined weight is reached, the ingredients are completed, the bottle caps are screwed by the automatic cap arranging and screwing machine 20 and finally the finished products are stored on the finished product temporary storage platform 23.

[0073] In an embodiment, the automatic bottle arranging machine 1 comprises a first frame 24, a rotating disc 25, a flow guide plate and a rotating disc driving device 27.

[0074] The rotating disc 25 is rotatably arranged in the first frame 24 and is used for placing the empty powder bottles.

[0075] The flow guide plate forms a flow guide channel which is in communication with the inside and outside of the rotating disc 25 at two ends and is used for guiding the powder bottles into the flow guide channel and conveying them to the next process.

[0076] The rotating disc driving device 27 is used for driving the rotating disc 25.

[0077] Specifically, the flow guide plate comprises a surrounding plate 261, a side plate 262 and an intermediate plate 263. The surrounding plate 261 is arranged at the periphery of the rotating disc 25 and is fixedly connected with the first frame 24. The side plate 262 and the inner wall of the surrounding plate 261 form the flow guide channel. The intermediate plate 263 is used for pushing the powder bottles to the side close to the surrounding plate 261. One end of the intermediate plate 263 is connected with the surrounding plate 261.

[0078] As shown in FIG. 1, the automatic bottle arranging machine 1 comprises a first frame 24, a rotating disc 25, a flow guide plate and a rotating disc driving device 27. Figure 4As shown, the turntable drive device 27 is installed on the first frame 24 and the drive shaft is connected to the turntable 25 and located below the turntable 25. The intermediate plate 263 is installed on the frame and located at the center of the turntable 25. The powder bottle is placed on the turntable 25. The rotation of the turntable 25 generates centrifugal force, and the bottle moves from the center of the turntable 25 in the circumferential direction. Finally, under the action of the guide plate and centrifugal force, the bottle automatically moves along the tangent direction of the surrounding plate 261 and enters the guide channel to achieve the effect of automatic bottle sorting.

[0079] In one specific embodiment, the automatic bottle cleaning machine 2 includes: a second frame 28, a cover 29, a bottle blowing device 31, and a bottle clamping and flipping mechanism 32. The cover 29 is mounted on the second frame 28 and covers the belt conveyor line at the outlet of the automatic bottle unscrambler 1, forming an operating cavity. The bottle blowing device 31 and the bottle clamping and flipping mechanism 32 are located within the operating cavity and can perform cleaning operations on powder bottles. The bottle blowing device 31 is used to dry the powder bottles; the bottle clamping and flipping mechanism 32 is used to clamp the powder bottles on the belt conveyor line and flip them onto the bottle blowing device 31.

[0080] The automatic bottle cleaner 2 also includes a first dust removal device 30, used to establish negative pressure inside the cavity of the machine casing 29. The entire automatic cleaning process operates within the sealed cavity of the equipment (for easy observation of the internal conditions). Figure 5 The machine cover 29 shown is not the top cover of the machine cover. The entire working chamber and the bottle cleaning point are connected to the dust removal system. A negative pressure is established in the chamber to suppress the overflow of dust generated during the bottle cleaning process.

[0081] like Figure 5 As shown, the bottle-clamping and tilting mechanism 32 is installed on the second frame 28. The bottle-blowing device 31 is connected to compressed air and is installed on the second frame 28 directly below the bottle after the bottle-clamping and tilting mechanism 32 has tilted the bottle. The bottle-blowing device 31 consists of multiple nozzles (6 as shown in the figure). The nozzle outlet diameter is 3mm. To ensure the blowing effect inside the bottle, the nozzle outlet velocity needs to be controlled to be greater than 20m / s, that is, the compressed air flow rate connected to the bottle-blowing device 31 is not less than 3m / h. The bottle-blowing device 31 uses an electromagnetic pulse valve to control the high-frequency bottle-blowing operation. A first dust removal device 30 is installed at the bottle mouth position. The first dust removal device 30 is connected to the centralized dust removal system 3 to establish a local negative pressure near the bottle mouth to collect the dust generated during bottle blowing. The machine cover 29 is installed on the second frame 28 to cover the bottle-clamping and tilting mechanism 32, the bottle-blowing device 31, and the second dust removal device 36. The machine cover 29 is connected to the centralized dust removal system 3. A negative pressure is established inside the machine cover 29 to further suppress dust overflow.

[0082] Similarly, a third dust removal device 41 for establishing negative pressure inside the coarse filling silo and / or replenishment filling silo can also be installed.

[0083] The dust-free feeding station comprises a feeding station body 35, a feeding port cover 37, a foreign matter prevention permanent magnetic grid device 38, a second dust removal device 36, a multi-petal butterfly valve 39 for discharging and a flexible connection 33. The feeding port cover 37 is reversibly arranged at the inlet of the feeding station body 35, and the multi-petal butterfly valve 39 for discharging and the flexible connection 33 are sequentially arranged at the outlet of the feeding station body 35. The flexible connection 33 can be a hose. The foreign matter prevention permanent magnetic grid device 38 is arranged on the channel of the feeding station body 35. The second dust removal device 36 is used to establish negative pressure in the cavity of the feeding station body 35.

[0084] In an embodiment, the high-precision powder comprises A material, B material and C material. The dust-free feeding station comprises an A material dust-free feeding station 4, a B material dust-free feeding station 5 and a C material dust-free feeding station 6. The coarse filling bin comprises an A material coarse filling bin 8, a B material coarse filling bin 12 and a C material coarse filling bin 16. The coarse filling weighing mechanism comprises an A material coarse filling weighing mechanism 9, a B material coarse filling weighing mechanism 13 and a C material coarse filling weighing mechanism 17. The supplementary filling bin comprises an A material supplementary filling bin 10, a B material supplementary filling bin 14 and a C material supplementary filling bin 18. The supplementary filling weighing mechanism comprises an A material supplementary filling weighing mechanism 11, a B material supplementary filling weighing mechanism 15 and a C material supplementary filling weighing mechanism 19.

[0085] The dust-free feeding station further comprises an airflow assisting device 34 arranged on the feeding station body 35, which is used to facilitate discharging. The airflow assisting device 34 can be a vibration motor or other mechanisms. The inner cavity of the feeding station body 35 and the feeding port are connected to the centralized dust removal system 3. Negative pressure is used for dust removal during feeding to prevent dust from overflowing during feeding. The feeding station body 35 is provided with a foreign matter grid and a permanent magnet iron remover to prevent foreign matters introduced during feeding from flowing to the next process.

[0086] In an embodiment, the automatic cap sorting and capping machine 20 comprises a cap bin 45, a cap sorting lifting device 46, a cap hanging mechanism 48, a servo capping device 49 and a positioning and clamping mechanism 50. The cap hanging mechanism 48 is used to take the bottle cap from the cap bin 45 by the cap sorting lifting device 46 and place it on the powder bottle. The positioning and clamping mechanism 50 is used to clamp the powder bottle with the bottle cap. The servo capping device 49 is used to tighten the bottle cap.

[0087] As Figure 9As shown, the automatic cap sorting and capping machine 20 includes a cap bin 45, a cap sorting lifting device 46, a lower cap groove 47, a cap hanging mechanism 48, a servo capping device 49, and a positioning and clamping mechanism 50. The cap bin 45 is used for temporary storage of caps. The cap sorting lifting device 46 is an upward conveying belt mechanism (the front structure is not shown in the figure) with a certain slope, which conveys the caps from the cap bin 45 to the inlet of the lower cap groove 47 installed on the cap sorting lifting device 46. A plurality of blocking grooves are arranged on the cap sorting lifting device 46. The height of the blocking groove is greater than the center of gravity of the normal cap and less than the center of gravity of the reverse cap. The center of gravity of the reverse cap does not match the height of the blocking groove, and the reverse cap automatically falls back to the cap bin 45, and the normal cap is lifted upward. The inlet of the lower cap groove 47 is connected to the outlet of the cap sorting lifting device 46, and the sorted caps are conveyed to the cap hanging mechanism 48 by gravity. The cap hanging mechanism 48 is installed at the outlet of the lower cap groove 47, and the cap hanging mechanism 48 hangs the caps on the bottle mouth after filling. The bottles with caps hung are conveyed forward by the conveying belt to the positioning and clamping mechanism 50 to complete the positioning and clamping of the bottles, and the caps are tightened by the servo capping device 49.

[0088] The automatic cap sorting and capping machine 20 and the finished product temporary storage platform 23 also include an online printing and labeling machine 21. The online printing and labeling machine 21 includes a labeling machine host 51, an online code printing device 52, a labeling device 53, and a label brushing device 54. The online code printing device 52 receives the actual weight information of the filling machine, compiles it into a two-dimensional code, and prints it on the label. Then the labeling device 53 pastes the label one by one onto the powder bottle.

[0089] As shown in Figure 10 The online printing and labeling machine 21 includes a labeling machine host 51, an online code printing device 52, a labeling device 53, and a label brushing device 54. The online code printing device 52 needs to receive the weighing data of the weighing mechanism and number the corresponding filling bottles. The number is consistent with the weighing information number recorded by the weighing system, which facilitates the tracing of the filling and weighing situation. The online code printing device 52 is installed on the labeling machine host 51. The information printed on the label by the online code printing device includes product batch number, date, actual filling weight, target weight, and other information. After the information is printed, the labeling device 53 automatically pastes the label onto the corresponding powder bottle. After the label is pasted, the label brushing device 54 brushes the label to make it firm.

[0090] The conveying and temporary storage system 22 is a belt conveying line which passes through the automatic bottle cleaning machine 2, the A-material double-head powder weighing and filling equipment, the B-material double-head powder weighing and filling equipment, the C-material double-head powder weighing and filling equipment, the automatic cap sorting and capping machine 20, and the online printing and labeling machine 21 in sequence. The belt conveying line is used for material buffering and conveying connection between equipment.

[0091] The finished product temporary storage platform 23 is a stainless steel platform located at the end of the system for buffering finished product materials. The feeding platform 7 is located above the powder weighing and filling equipment for buffering raw materials and manual feeding.

[0092] The centralized dust removal system 3 includes a cyclone separator, a filter, a centrifugal fan and a dust removal pipeline. The dust removal pipeline is connected to the automatic bottle cleaning machine 2, the material feeding station, the filling machine station and the like, and a negative pressure is established in the fixed area of the station to prevent dust overflow.

[0093] The centralized dust removal system 3 is connected to the dust removal points of the automatic bottle cleaning machine 2, the dust-free material feeding station, the A material double-head powder weighing and filling equipment, the B material double-head powder weighing and filling equipment and the C material double-head powder weighing and filling equipment in Figure 2 . The dust removal points are connected to the inlet of the cyclone separator, and the gas-solid separation is preliminarily performed by the cyclone separator. The gas outlet of the cyclone separator is connected to the inlet of the filter, and fine filtration is performed by the filter. The outlet of the filter is connected to the centrifugal fan. The filter core is made of polyeater material. The air volume of the centrifugal fan is 3500 m / h-4000 m / h.

[0094] As shown in Figure 1 and Figure 6 , the dust-free material feeding stations 4, 5 and 6 are used for feeding A, B and C materials. The A material dust-free material feeding station 4 is installed on the feeding platform 7 and located directly above the A material coarse filling material bin 8 and the A material supplementary filling material bin 10. The B material dust-free material feeding station 5 is installed on the feeding platform 7 and located directly above the B material coarse filling material bin 12 and the B material supplementary filling material bin 14. The C material dust-free material feeding station 6 is installed on the feeding platform 7 and located directly above the C material coarse filling material bin 16 and the C material supplementary filling material bin 18. The feeding port cover 37 is installed on the feeding station main body 35, and the feeding port cover 37 is opened during feeding to perform the feeding operation. The anti-foreign matter permanent magnetic grid device 38 is installed in the inner cavity of the feeding station main body 35 and is composed of a grid and a permanent magnetic bar. The grid prevents packaging foreign matters from flowing into the next process, and the permanent magnetic bar adsorbs magnetic foreign matters in the material to prevent the magnetic foreign matters from flowing into the next process. The second dust removal device 36 is installed on the top of the feeding station main body 35 and is connected to the centralized dust removal system 3 to establish a local negative pressure at the feeding port position to collect the dust raised during feeding. The flow assisting device 34 is installed below the feeding station main body 35, and the vibration flow assisting device is combined with the multi-petal butterfly valve 39 during the discharging process to complete the uniform feeding of the dust-free material feeding station to the material bins of the next process. Each dust-free material feeding station has two multi-petal butterfly valves 39 corresponding to the coarse filling material bin and the supplementary filling material bin. The soft connection 33 is used to connect the A material dust-free material feeding station 4, the B material dust-free material feeding station 5 and the C material dust-free material feeding station 6 to the A material coarse filling material bin 8, the B material coarse filling material bin 12, the C material coarse filling material bin 16, the A material supplementary filling material bin 10, the B material supplementary filling material bin 14 and the C material supplementary filling material bin 18.

[0095] Figure 2The A-material double-head powder weighing and filling equipment comprises an A-material coarse filling bin 8, an A-material coarse filling weighing mechanism 9, an A-material supplement filling bin 10, and an A-material supplement filling weighing mechanism 11. Similarly, the B-material double-head powder weighing and filling equipment and the C-material double-head powder weighing and filling equipment have corresponding components.

[0096] Referring to Figure 7 and Figure 8 , the A-material double-head powder weighing and filling equipment is taken as an example. The A-material coarse filling bin 8 is composed of a coarse filling bin, a servo motor, a synchronous motor, a coarse filling feeding screw (i.e. the screw 42 for assisting in discharging in the foregoing), a stirring device 43, a coarse filling weighing mechanism, and a coarse filling screw feeding leakage stopping device 44. The coarse filling bin is made of S30408 stainless steel, and the surface in contact with the material is sprayed with a 300 μm-thick ECTFE coating to ensure that the friction coefficient of the surface in contact with the material is ≤0.075, thereby avoiding material sticking to the component. The transmission shaft axis of the servo motor is coaxially installed with the axis of the coarse filling bin, and the servo motor is located at the top of the coarse filling bin. The axis of the coarse filling feeding screw is coaxially installed with the coarse filling bin, and the coarse filling feeding screw is located inside the bin. The coarse filling feeding screw is connected with the transmission shaft of the servo motor by means of a coupling. The axis of the synchronous motor is installed perpendicularly to the axis of the coarse filling bin, the center line of the stirring device 43 is coaxially installed with the coarse filling bin, the stirring device 43 is coaxially connected with the driven bevel gear, the transmission shaft of the synchronous motor is coaxially connected with the driving bevel gear, and the driving bevel gear and the driven bevel gear mesh and transmit at the top of the bin. The coarse filling weighing mechanism is composed of a group of weighing sensors, which are installed on the upper part of the outer wall of the coarse filling bin and detect the weight to determine the material level. The leakage stopping device 44 of the coarse filling screw feeding device is driven by a quick cylinder to act, is installed at the discharge port of the coarse filling feeding screw, and is used to close the discharge port after filling is completed to prevent passive material dropping from affecting the quantitative accuracy. The second dust removal device 36 is installed beside the discharge port of the coarse filling feeding screw, is connected with the centralized dust removal system 3, establishes a local negative pressure at the filling and discharging position, and suppresses the overflow of the dust raised in the discharging process. The coarse filling feeding screw is an equal-diameter variable-pitch screw. The coarse filling target quantity should be the final material filling target quantity minus the maximum positive tolerance of coarse filling, so as to ensure that the filling quantity after coarse filling is less than the final filling target quantity. The specific filling process is shown in Figure 3 .

[0097] The A material supplement filling bin 10 is composed of a supplement filling bin, a servo motor, a supplement filling feeding screw, a stirring device 43, a supplement filling weighing mechanism, and a supplement filling screw leakage stop device 44. The supplement filling bin is made of S30408 stainless steel, and the surface in contact with the material is sprayed with a 300 μm thick ECTFE coating to ensure that the friction coefficient of the surface in contact with the material is ≤0.075, thereby avoiding material sticking to the component. The axis of the servo motor transmission shaft is coaxially installed with the axis of the supplement filling bin, and the servo motor is located at the top of the supplement filling bin. The axis of the supplement filling feeding screw is coaxially installed with the axis of the supplement filling bin, and the supplement filling feeding screw is located inside the bin. The supplement filling feeding screw is connected to the servo motor transmission shaft using a shaft coupling. The stirring device 43 is connected to the supplement filling feeding screw and rotates synchronously. During feeding, the stirring device 43 rotates synchronously to prevent the material from arching and affecting the continuity of the discharge. The supplement filling weighing mechanism is composed of a group of weighing sensors. The weighing sensors are installed on the upper part of the outer wall of the supplement filling bin and determine the material level by detecting the weight. The supplement filling screw leakage stop device 44 is driven by a quick cylinder and is installed at the discharge port of the supplement filling feeding screw. After filling is completed, the discharge port is closed to prevent passive material dropping and affecting the quantitative accuracy. The second dust removal device 36 is installed beside the discharge port of the supplement filling feeding screw and is connected to the centralized dust removal system 3. Local negative pressure is established at the filling discharge position to suppress the overflow of dust raised during the discharge process. The supplement filling feeding screw is an equal-diameter variable-pitch screw. The filling amount of the supplement filling is equal to the final filling target amount minus the actual filling amount of the rough filling. The specific filling process is shown in FIG. 6. Figure 3 .

[0098] The A material rough filling weighing mechanism 9 and the A material supplement filling weighing mechanism 11 are both composed of a weighing device and a work advancing device. The rough filling weighing mechanism and the supplement filling weighing mechanism use single-point weighing sensors with a B-grade precision level. The weighing sensors have a 5 Kg range and 20,000 divisions to ensure that the static progress of the weighing mechanism is higher than the quantitative accuracy requirement. The rough filling weighing mechanism and the supplement filling weighing mechanism are installed on the machine table and are located on the side of the belt conveying line in the conveying direction. The work advancing device is used to transfer the powder bottle after rough filling between the belt conveying line and the rough filling weighing mechanism, and to transfer the powder bottle after supplement filling between the belt conveying line and the supplement filling weighing mechanism. The weighing sensor collects the weight signal in the form of an electrical signal and feeds it back to the weighing controller. After signal processing, the weighing controller transmits the weight signal to the programmable controller of the system for logical control. The work advancing device is installed on the double-head powder filling machine rack and is used for the work advancing movement of the powder bottle.

[0099] Figure 2The principle of the B material double-head powder weighing and filling equipment and the C material double-head powder weighing and filling equipment in the A material double-head powder weighing and filling equipment is the same as that of the A material double-head powder weighing and filling equipment.

[0100] According to the high-precision powder automatic batching system for lithium battery materials, as shown in the embodiment, the application further provides a high-precision powder automatic batching method for lithium battery materials, which comprises the following steps of: Figure 3

[0101] Step 1: The dust-free feeding station feeds the coarse filling bin and the supplementary filling bin respectively until the material level of the coarse filling bin and the supplementary filling bin meets the filling condition, and the coarse filling weighing mechanism automatically resets to zero.

[0102] Step 2: The leakage stop device of the coarse filling bin is opened, the screw of the coarse filling bin is started to feed rapidly until the coarse filling is disconnected, the screw of the coarse filling bin is started to feed slowly until the target filling amount is reached (the target filling amount needs to be ensured to be less than the final target amount), the screw of the coarse filling bin is stopped to feed, the leakage stop device of the coarse filling bin is closed, and the work feeding mechanism transports the powder bottle to the supplementary filling position (the second filling position).

[0103] Step 3: The supplementary filling weighing mechanism re-weighs whether the first filling amount is out of tolerance, when it is out of tolerance, the work feeding mechanism transports the powder bottle to the bottle outlet position, when it is not out of tolerance, the supplementary filling weighing mechanism determines the supplementary filling amount, and when the supplementary filling amount is less than the minimum filling amount, step 4 is entered, when the supplementary filling amount is greater than the minimum filling amount, the leakage stop device of the supplementary filling bin is opened, the screw of the supplementary filling bin is started to feed rapidly until the minimum filling amount of the supplementary filling is disconnected.

[0104] Step 4: The screw of the supplementary filling bin is started to feed slowly until the final target filling amount is reached, the screw of the supplementary filling bin is stopped to feed, the leakage stop device of the supplementary filling bin is closed, and the supplementary filling weighing mechanism self-checks whether the filling amount is out of tolerance, when it is out of tolerance, the powder bottle is rejected, and when it is not out of tolerance, the work feeding mechanism transports the powder bottle to the bottle outlet position. Subsequently, the next powder bottle is positioned, and the above-mentioned actions are performed in a cycle.

[0105] The core batching and filling of the application adopts double-screw feeding combined with a high-precision weighing feedback system to perform four-stage feeding control. The first and second stage coarse filling is rapidly under-filled filling, which ensures the under-filled filling state and makes the filling amount rapidly approach the final filling target amount, and the third and fourth stage filling is high-precision supplementary filling according to the actual under-filled situation of the coarse filling, so that the filling reaches the target weight.

[0106] ​The high-precision powder automatic batching system for lithium battery materials provided in the case, the full-automatic sub-packaging, batching and packaging of the powder, the sub-packaging and packaging operation process are fully automated production, and the sub-packaging container is a plastic bottle. All the dust raising parts in the system are provided with negative pressure dust removal to prevent dust overflow and reduce the long-term operation risk of the operators to the maximum extent. At the same time, the high-precision and rapid sub-packaging of the lithium battery material industry can be realized, the target value deviation of the filling amount can be less than ±0.5g, and the precision stability is high. The current manual operation efficiency of the powder is low, the precision stability is unreliable, and the dust occupational hazard risk is high.

[0107] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0108] The principles and implementation modes of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A high-precision powder automatic batching system for lithium battery materials, characterized in that, The application relates to a powder feeding system. The system comprises: a conveying and temporary storage system, which uses a belt conveying line to convey powder bottles; a feeding platform, a dust-free feeding station, a rough filling bin, a rough filling weighing mechanism, a supplementary filling bin and a supplementary filling weighing mechanism; a work advancing mechanism, which is used for transferring the powder bottles to different work stations; wherein the dust-free feeding station is arranged on the feeding platform, and the dust-free feeding station, the rough filling bin, the rough filling weighing mechanism, the supplementary filling bin and the supplementary filling weighing mechanism form a group of filling devices, the number of the filling devices is consistent with the number of powder types required, a plurality of groups of the filling devices are arranged along the conveying direction of the belt conveying line in sequence, the outlet of the dust-free feeding station is respectively connected with the inlet of the rough filling bin and the inlet of the supplementary filling bin, the outlet of the rough filling bin and the outlet of the supplementary filling bin are used for feeding the powder bottles on the belt conveying line, the rough filling weighing mechanism is used for weighing the powder bottles after rough filling, the supplementary filling weighing mechanism is used for weighing the powder bottles after supplementary filling, and the work advancing mechanism is used for transferring the powder bottles after rough filling between the belt conveying line and the rough filling weighing mechanism and transferring the powder bottles after supplementary filling between the belt conveying line and the supplementary filling weighing mechanism.

2. The high-precision powder automatic batching system for lithium battery materials according to claim 1, characterized in that, The rough filling bin and the supplementary filling bin are both provided with a screw and a stirring device, a driving mechanism is arranged on the rough filling bin and the supplementary filling bin, the driving mechanism is used for driving the screw and the stirring device to rotate, and a leak stopping device is arranged at the outlet of the rough filling bin and the supplementary filling bin. The system further comprises: an automatic bottle arranging machine, which is used for arranging empty powder bottles in a row; an automatic bottle cleaning machine, which is used for cleaning the inside of the powder bottles; an automatic cap arranging and screwing machine, which is used for screwing the bottle caps; a finished product temporary storage platform; 3.The high-precision powder automatic batching system for lithium battery materials of claim 2, wherein, wherein the powder bottles are output by the automatic bottle arranging machine, sequentially pass through the automatic bottle cleaning machine, the rough filling bin, the supplementary filling bin, the automatic cap arranging and screwing machine and the finished product temporary storage platform along the belt conveying line. The automatic bottle arranging machine comprises: a first rack; a rotating disc, which is rotatably arranged on the first rack and is used for placing empty powder bottles; a guide plate, which forms a guide channel that is in communication with the inside and outside of the rotating disc respectively and is used for guiding a plurality of the powder bottles into the guide channel and conveying the powder bottles to the next working procedure; 4. The high-precision powder automatic batching system for lithium battery materials according to claim 3, characterized in that, a rotating disc driving device, which is used for driving the rotating disc. The guide plate comprises: a surrounding plate, which is arranged on the periphery of the rotating disc and is fixedly connected with the first rack; a side plate, which surrounds the guide channel with the inner wall of the surrounding plate; 5. The high-precision powder automatic batching system for lithium battery materials according to claim 2, characterized in that, a middle plate, which is used for pushing the powder bottles to the side close to the surrounding plate. The automatic bottle cleaning machine comprises: a second rack and a machine cover, which is arranged on the belt conveying line at the outlet of the automatic bottle arranging machine and forms a working cavity; a bottle blowing device, which is used for blowing the powder bottles; 6.The high-precision powder automatic batching system for lithium battery materials of claim 5, wherein, a bottle clamping and overturning mechanism, which is used for clamping the powder bottles on the belt conveying line and overturning the powder bottles to the bottle blowing device. The automatic bottle cleaning machine further comprises a first dust removal device, which is used for establishing a negative pressure in the cavity of the machine cover. 7.The high-precision powder automatic batching system for lithium battery materials of claim 1, wherein, The dust-free feeding station comprises a feeding station body, a feeding port cover, a foreign matter prevention permanent magnetic grid device, a second dust removal device, a multi-petal butterfly valve for discharging and a flexible connection, the inlet of the feeding station body is reversibly provided with the feeding port cover, the outlet is sequentially provided with the multi-petal butterfly valve for discharging and the flexible connection, the foreign matter prevention permanent magnetic grid device is arranged on the channel of the feeding station body, and the second dust removal device is used to establish negative pressure in the cavity of the feeding station body. 8.The high-precision powder automatic batching system for lithium battery materials of claim 2, wherein, The automatic cap sorting and capping machine comprises a cap bin, a cap sorting and lifting device, a cap hanging mechanism, a servo capping device and a positioning and clamping mechanism, the cap hanging mechanism is used to take the bottle cap from the cap bin by the cap sorting and lifting device and place the bottle cap on the powder bottle, the positioning and clamping mechanism is used to clamp the powder bottle with the bottle cap, and the servo capping device is used to tighten the bottle cap. 9.The high-precision powder automatic batching system for lithium battery materials of claim 2, wherein, The automatic cap sorting and capping machine and the finished product temporary storage platform further comprise an online spray printing and labeling machine.

10. A high-precision powder automatic batching method for lithium battery materials, characterized in that, The high-precision powder automatic batching system for lithium battery materials according to any one of claims 1-9 comprises the following steps: Step 1, the dust-free feeding station feeds the coarse filling bin and the supplementary filling bin respectively until the filling level of the coarse filling bin and the supplementary filling bin meets the filling condition, and the coarse filling weighing mechanism automatically resets to zero; Step 2, the leak stop device of the coarse filling bin is opened, the screw of the coarse filling bin is started to rapidly feed until the coarse filling is disconnected, the screw of the coarse filling bin is started to slowly feed until the target filling amount is reached, the screw of the coarse filling bin is stopped to feed, the leak stop device of the coarse filling bin is closed, and the powder bottle is conveyed to the supplementary filling position by the conveying mechanism; Step 3, the supplementary filling weighing mechanism re-checks whether the filling amount is out of tolerance, when the filling amount is out of tolerance, the powder bottle is conveyed to the bottle outlet position by the conveying mechanism, when the filling amount is not out of tolerance, the supplementary filling amount is determined, and when the supplementary filling amount is less than the minimum filling amount, step 4 is entered, when the supplementary filling amount is greater than the minimum filling amount, the leak stop device of the supplementary filling bin is opened, the screw of the supplementary filling bin is started to rapidly feed until the minimum supplementary filling amount is disconnected; Step 4, the screw of the supplementary filling bin is started to slowly feed until the final target filling amount is reached, the screw of the supplementary filling bin is stopped to feed, the leak stop device of the supplementary filling bin is closed, the supplementary filling weighing mechanism self-checks whether the filling amount is out of tolerance, when the filling amount is out of tolerance, the powder bottle is rejected, and when the filling amount is not out of tolerance, the powder bottle is conveyed to the bottle outlet position by the conveying mechanism.

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