Heating and mixing device

Abstract

The utility model discloses a heating mixing device which comprises a support, a medium-frequency induction heating structure and a rotating tank horizontally arranged on the support, the medium-frequency induction heating structure comprises a hollow copper pipe surrounding the outer ring of the rotating tank, cooling liquid in the hollow copper pipe and a power source connected with the hollow copper pipe, and the rotating tank can rotate on the support. A mixing structure is arranged in the rotating tank, a feeding assembly and an air inlet pipe are arranged at one end of the rotating tank, and a discharging assembly and an exhaust pipe are arranged at the other end of the rotating tank. The heating and mixing device replaces a heating production line of a traditional sintering technology kiln, the occupied area is greatly reduced, energy consumption and loss are lower, the processing time is shortened, and the working efficiency is improved; the rotary tank replaces the labor cost of a sagger of a kiln in the traditional technology, so that the production cost is lower; nitrogen is filled through the air inlet pipe, oxygen in the rotating tank is exhausted through the exhaust pipe, an oxygen-free environment is achieved in the rotating tank, lithium battery powder raw materials are prevented from being oxidized in the heating process, and the quality of lithium battery powder is better.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery powder processing equipment, specifically to a heating and mixing device. Background Technology

[0002] Lithium battery powder needs to be purified to obtain higher purity lithium battery powder in order to improve the storage capacity of lithium batteries. At present, most lithium battery powder is heated and evaporated in a kiln and waste gas is discharged. For example, Chinese utility model patent application number 202110681868.2 discloses a gas-heated roller kiln for producing lithium battery materials. It includes a kiln body (1), a protective gas replacement chamber (2), a mechanical transmission device and an automatic control device. The kiln body (1) is divided into a heating section, a heat preservation section, a slow cooling section and a cooling section. A gas heating system is arranged in the heating section and the heat preservation section of the kiln body (1), and a self-preheating ejector radiant tube burner is used as the fuel. The burner is arranged in an alternating upper and lower row, symmetrically distributed at multiple points, and controlled by pulse timing in multiple zones. A flue gas extraction pipe (8) and a waste gas extraction pipe (9) are installed on the top of the kiln, and a stirring fan (22) is installed on the top of each kiln section. The roller (3) is sealed with a sealing box, and the exposed parts of the sealing box on both sides are sealed with flanges. A water cooling device (10) and an air cooling pipe (25) are installed in the slow cooling section and cooling section of the kiln body (1). The protective gas replacement chamber (2) is set at both ends of the inlet and outlet of the kiln. The protective gas is sent into the furnace and the transmission sealing cover through the protective gas pipe (7) and the bottom protective gas branch pipe (26) set below the kiln body (1) and the upper protective gas branch pipe (27). This type of kiln, which seals and heats lithium battery powder raw materials in a sagger, then processes them through the entire kiln production line to finally obtain lithium battery powder, has the following disadvantages: 1. The kiln heating production line is long, resulting in a large footprint, long processing time, and high energy consumption; 2. Heating the lithium battery powder raw materials in a sealed sagger leads to uneven heating, incomplete removal of impurities and exhaust gases during the heating process, resulting in lithium battery powder with high impurity content and insufficient purity, leading to poor energy storage quality; 3. The saggers are heated at high temperatures for extended periods, limiting their lifespan, generally requiring replacement every three months, increasing production costs; 4. The oxygen-rich processing environment of the lithium battery powder raw materials causes them to oxidize and turn black during heating, reducing the quality of the lithium battery powder. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a heating and mixing device with smaller footprint, lower energy consumption, higher production capacity and lower production cost.

[0004] Therefore, this utility model is implemented using the following technical solution:

[0005] A heating and mixing device is characterized by comprising a support, a medium-frequency induction heating structure, and a rotating tank horizontally disposed on the support. The medium-frequency induction heating structure includes a hollow copper tube surrounding the outer ring of the rotating tank, a coolant inside the hollow copper tube, and a power supply connected to the hollow copper tube. The rotating tank can rotate on the support. A mixing structure is provided inside the rotating tank. One end of the rotating tank is provided with a feeding assembly and an air inlet pipe, and the other end of the rotating tank is provided with a discharging assembly and an exhaust pipe.

[0006] Furthermore, the rotary tank has a feed cone on one side and a discharge cone on the other side. The feed cone is connected to the feed assembly, and the discharge cone is connected to the discharge assembly. The feed assembly includes a feed ring and a feed flange that are fixedly connected. The discharge assembly includes a discharge ring and a discharge flange that are fixedly connected. The feed flange and the discharge flange are fixedly connected to the support. The feed ring is provided with a feed pipe that communicates with the hopper. The discharge ring is provided with a discharge hopper.

[0007] Furthermore, the feed cone is fitted with multiple cone sprockets, the support is equipped with a drive motor, the drive motor shaft is equipped with a motor sprocket aligned with the cone sprockets, the motor sprocket and the cone sprockets are connected by a chain for transmission, both the feed cone and the discharge cone are equipped with rings, and the support is equipped with multiple support rollers that can rest on the rings.

[0008] Furthermore, the hybrid structure includes a first helical blade and a second helical blade with opposite helical directions. The outer ring of the first helical blade is welded and fixed to the inner wall of the rotating tank. The outer diameter of the second helical blade is smaller than the inner diameter of the first helical blade, and the outer ring of the second helical blade and the inner ring of the first helical blade are connected by several connecting rods.

[0009] Furthermore, the discharge cone has a discharge port, and the inner wall of the discharge cone is provided with multiple guide plates. The guide plates extend from the right end of the discharge cone to the discharge port. The guide plates are generally arc-shaped, and the angle between the guide plates and the inner wall of the discharge cone is an acute angle. The guide plates and the discharge cone form a feeding groove. The inner wall of the discharge flange is provided with a transition ring. The middle of the transition ring bulges inward to form a bend. One side of the transition ring smoothly transitions with the inner wall of the discharge cone, and the other side smoothly transitions with the inner wall of the discharge hopper. The discharge hopper has an isolation frame. The outer end of the isolation frame is provided with a cylinder. The drive rod of the cylinder is inserted into the discharge hopper. The other end of the drive rod is provided with a discharge tongue that can abut against the transition ring.

[0010] Furthermore, the feed ring is equipped with a temperature sensor inserted into the feed cone, the feed pipe is equipped with a differential pressure sensor, the exhaust pipe is equipped with an oxygen sensor, and the outer ring of the rotating tank is equipped with a heat insulation material layer.

[0011] Furthermore, thin-walled bearings and multiple graphite packing seal assemblies are provided between the feed ring and the feed cone, and between the discharge ring and the discharge cone. The feed ring and the discharge ring are provided with oil passages that communicate with the corresponding graphite packing seal assemblies, and the oil passage inlets are equipped with oil injection nozzles.

[0012] Furthermore, the inner rings of the feed ring and the discharge ring are provided with multiple first grooves, and the feed cone and the discharge cone are provided with multiple second grooves that are misaligned and communicate with the first grooves. The feed ring and the discharge ring are provided with air passages that communicate with the outermost first groove, and the air passage inlet has an air injection nozzle.

[0013] After adopting the above technical solution, the lithium battery powder raw material is heated by the medium-frequency induction heating structure of the heating device. The impurities and moisture in the sintered material are evaporated and the exhaust gas is discharged through the exhaust pipe. Then, it is discharged to the next process through the discharge hopper. This heating and mixing device replaces the heating production line of the traditional sintering kiln, which greatly reduces the footprint, lowers energy consumption and loss, shortens processing time, and improves work efficiency. Under the mixing action of the rotating tank, the lithium battery powder raw material is not only sintered more uniformly, but also all impurities in the material are sintered, evaporated, and exhaust gas is discharged during the dynamic mixing process. This results in less impurity and higher purity in the processed lithium battery powder, thus improving the energy storage quality of the lithium battery powder. At the same time, the rotating tank replaces the cost of the sagger of the traditional kiln, reducing production costs. In addition, nitrogen is introduced into the rotating tank through the air inlet pipe and oxygen is removed from the rotating tank through the exhaust pipe, creating an oxygen-free environment inside the rotating tank. This prevents the lithium battery powder raw material from being oxidized during the heating process, resulting in better lithium battery powder quality. Attached Figure Description

[0014] The present invention includes the following figures:

[0015] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the right-side structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the first groove, the second groove, the air passage, etc. in this utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the graphite packing sealing assembly, oil passage, and other structures in this utility model.

[0019] Reference numerals: 2. Support; 3. Rotary tank; 4. Exhaust pipe; 5. Inlet pipe; 6. Medium frequency induction heating structure; 7. Hollow copper tube; 8. Coolant; 18. Feed cone; 19. Discharge cone; 20. Feed ring; 21. Feed flange; 22. Discharge ring; 23. Discharge flange; 24. Feed pipe; 25. Discharge hopper; 26. Conical sprocket; 27. Drive motor; 28. Motor sprocket; 30. Ring; 31. Support roller; 32. Thin-walled bearing; 33. Graphite packing seal assembly Components; 37. First helical blade; 38. Second helical blade; 39. Connecting rod; 40. Guide plate; 41. Temperature sensor; 42. Oxygen sensor; 43. Differential pressure sensor; 46. Thermal insulation layer; 47. Oil passage; 48. Oil injector; 49. Hopper; 51. Discharge port; 52. Feed chute; 53. Transition ring; 54. Isolation frame; 55. Cylinder; 56. Drive rod; 57. Discharge tongue; 58. First groove; 59. Second groove; 60. Air passage; 61. Air injector. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] Referring to the above figures, the heating and mixing device provided by this utility model includes a support 2, a medium-frequency induction heating structure 6, and a rotating tank 3 horizontally mounted on the support 2. The medium-frequency induction heating structure 6 includes a hollow copper tube 7 surrounding the outer ring of the rotating tank 3, a coolant 8 inside the hollow copper tube 7, and a power supply connected to the hollow copper tube 7. The medium-frequency induction heating structure 6 provides more uniform heating to the rotating tank 3. The medium-frequency induction heating structure 6 has the following advantages: high heating temperature, non-contact heating, high heating efficiency, energy saving, small footprint, and high production efficiency. The rotating tank 3 can rotate on the support 2. The rotating tank 3 is equipped with a mixing structure, and one end of the rotating tank 3 is equipped with a feeding assembly and an air inlet pipe 5, while the other end of the rotating tank 3 is equipped with an outlet. The rotary tank 3 includes a feeding cone 18 on one side and a discharging cone 19 on the other side. The feeding cone 18 is connected to the feeding assembly, and the discharging cone 19 is connected to the discharging assembly. The feeding assembly includes a fixedly connected feeding ring 20 and a feeding flange 21. The discharging assembly includes a fixedly connected discharging ring 22 and a discharging flange 23. The feeding flange 21 and the discharging flange 23 are fixedly connected to the support 2. The feeding ring 20 is provided with a feeding pipe 24, which communicates with a hopper 49. The discharging ring 22 is provided with a discharging hopper 25. Multiple inclined cone sprockets 26 are fitted on the feeding cone 18. A drive motor 27 is provided on the support 2. The shaft of the drive motor 27 is equipped with an electric motor aligned with the inclined cone sprockets 26. The sprocket 28, motor sprocket 28, and inclined cone sprocket 26 are connected by a chain for transmission. Both the feed cone 18 and the discharge cone 19 are provided with rings 30. The support 2 has multiple rollers 31 that can rest against the rings 30. The mixing structure includes a first helical blade 37 and a second helical blade 38 with opposite helical directions. The outer ring of the first helical blade 37 is welded and fixed to the inner wall of the rotating tank 3. The outer diameter of the second helical blade 38 is smaller than the inner diameter of the first helical blade 37, and the outer ring of the second helical blade 38 and the inner ring of the first helical blade 37 are connected by several connecting rods 39. The discharge cone 19 has a discharge port 51. Multiple guide plates 40 are provided on the inner wall of the discharge cone 19, extending from the right end of the discharge cone 19. Extending to the discharge port 51, the guide plate 40 is arc-shaped, and the angle between the guide plate 40 and the inner wall of the discharge cone 19 is acute. The guide plate 40 and the discharge cone 19 form a feeding groove 52. The inner wall of the discharge flange 23 is provided with a transition ring 53. The transition ring 53 bulges inward in the middle to form a bend. One side of the transition ring 53 smoothly transitions with the inner wall of the discharge cone 19, and the other side smoothly transitions with the inner wall of the discharge hopper 25. The discharge hopper 25 has an isolation frame 54. The outer end of the isolation frame 54 is provided with a cylinder 55. The drive rod 56 of the cylinder 55 is inserted into the discharge hopper 25. The other end of the drive rod 56 is provided with a discharge tongue 57 that can abut against the transition ring 53. This structure of the guide plate 40 facilitates the conveying of lithium battery powder to the discharge hopper 25.When the rotating tank 3 rotates in the forward direction, the first helical blade 37 conveys the lithium battery powder raw material towards the feeding cone 18, and the second helical blade 38 conveys the lithium battery powder raw material towards the discharging cone 19, making the lithium battery powder raw material in the rotating tank 3 more uniformly mixed. When the rotating tank 3 rotates in the reverse direction, the first helical blade 37 conveys the lithium battery powder raw material towards the discharging cone 19, and then it is conveyed to the discharge hopper 25 by the guide plate 40. The feeding ring 20 is equipped with a temperature sensor 41 inserted into the feeding cone 18. The temperature sensor 41 is used to detect the temperature inside the rotating tank 3 in order to control the heating temperature. The feed pipe 24 is equipped with a differential pressure sensor 43, and the pressure inside the rotating tank 3 is controlled according to the signal of the differential pressure sensor 43. The outer ring of the rotating tank 3 is equipped with a heat insulation material layer 46, which improves the heat preservation performance of the heating device and reduces energy consumption. The exhaust pipe 4 is equipped with an oxygen sensor 4. 2. Thin-walled bearings 32 and multiple graphite packing seal assemblies 33 are provided between the feed ring 20 and the feed cone 18, and between the discharge ring 22 and the discharge cone 19. The graphite packing seal assemblies 33 are mainly made of graphite wire reinforced with various reinforcing fibers and metal wires (steel wire, copper wire, nickel wire, carbon fiber, pre-oxidized fiber, glass yarn), etc., and are suitable for dynamic sealing under high temperature and high pressure conditions. The feed ring 20 and the discharge ring 22 are provided with... An oil passage 47 communicates with the corresponding graphite packing seal assembly 33. The inlet of the oil passage 47 has an oil injection nozzle 48. The inner rings of both the feed ring 20 and the discharge ring 22 are provided with multiple first grooves 58. Both the feed cone 18 and the discharge cone 19 are provided with multiple second grooves 59 that are offset from and communicate with the first grooves 58. The feed ring 20 and the discharge ring 22 are provided with air passages 60 that communicate with the outermost first groove 58. The inlet of the air passage 60 has an air injection nozzle 61.

[0022] The working principle of this utility model is as follows:

[0023] The power is turned on to enable the hollow copper tube 7 to perform medium-frequency induction heating on the rotating tank 3. Simultaneously, nitrogen gas is injected into the rotating tank 3 through the air inlet pipe 5, and oxygen inside the rotating tank 3 is discharged through the exhaust pipe 4. When the oxygen concentration in the rotating tank 3 is detected as O by the oxygen sensor 42, the valve of the feed pipe 24 is opened, allowing the lithium battery powder raw material in the hopper 49 to enter the rotating tank 3 through the feed pipe 24. During this process, the medium-frequency induction heating structure 6 continuously heats the rotating tank 3, ensuring the lithium battery powder raw material is continuously heated and impurities are evaporated. During the heating process, the drive motor 27 is started, and the electric... The cooperation of the sprocket 28, chain, and inclined cone sprocket 26 drives the feeding inclined cone 18, rotating tank 3, and discharging inclined cone 19 to rotate in the forward direction. During the rotation, the lithium battery powder raw material is dynamically and uniformly mixed and heated, so that the impurities and moisture in the lithium battery powder raw material evaporate during high-temperature sintering and the exhaust gas is discharged through the exhaust 6. After the lithium battery powder raw material is heated and sintered, the drive motor 27 reverses and drives the feeding inclined cone 18, rotating tank 3, and discharging inclined cone 19 to rotate in the reverse direction. The lithium battery powder raw material is lifted by the guide plate 40 to the discharge ring 22 and discharged to the next process through the discharge hopper 25.

[0024] In this embodiment, a medium-frequency induction heating structure 6 of the heating device is used to heat the lithium battery powder raw material, evaporate the impurities and moisture after sintering, and discharge the waste gas through the exhaust pipe 4. Then, it is discharged to the next process through the discharge hopper 25. This heating and mixing device replaces the heating production line of the traditional sintering kiln, greatly reducing the footprint, lowering energy consumption and losses, shortening processing time, and improving work efficiency. Under the mixing action of the rotating tank 3, the lithium battery powder raw material not only sinters more uniformly, but also allows all impurities in the material to be sintered, evaporated, and discharged during the dynamic mixing process. This results in less impurity and higher purity in the processed lithium battery powder, thereby improving the energy storage quality of the lithium battery powder. Good; at the same time, the rotary kiln 3 replaces the cost of the sagger in the traditional kiln, making the production cost lower; in addition, nitrogen is introduced into the rotary kiln 3 through the air inlet pipe 5 and oxygen is removed from the rotary kiln 3 through the exhaust pipe 4, so that the rotary kiln 3 achieves an oxygen-free environment, avoiding the oxidation of lithium battery powder raw materials during heating, and making the lithium battery powder of better quality; lubricating oil is injected into the oil passage 47 periodically through the oil injector 48, thereby keeping the graphite packing assembly lubricated and improving its service life; the setting of the thin-walled bearing 32 makes there a certain gap between the feed ring 20 and the feed cone 18, and between the discharge ring 22 and the discharge cone 19, so when the equipment is working, air is injected into the air passage 60 through the air injector 61, and the gas passes through the first groove 58, the second... The grooves 59, 58, and 59 eventually enter the rotating tank 3 through the gaps. Multiple staggered and interconnected first and second grooves 58 and 59 form a labyrinthine airtight seal, preventing material from entering the gaps during operation and affecting the sealing between the feed ring 20 and the feed cone 18, and between the discharge ring 22 and the discharge cone 19. The discharge cone 19 does not discharge material when rotating forward; when it rotates in reverse, the material enters the feeding trough 52 and moves towards the discharge port 51 for discharge. Because the guide plate 40 is arc-shaped, the feeding trough 52 can hold more material, increasing the discharge speed. Furthermore, the material slides down to the bottom of the (arc-shaped) feeding trough 52 due to its own weight, and then flows with the discharge cone 19... The continuous reversal causes the bottom of the relative feeding trough 52 (arc-shaped) to constantly change, resulting in a tendency for the material to slide towards the discharge port 51, further accelerating the discharge speed. The transition ring 53 on the inner wall of the discharge flange 23 bulges inward in the middle to form a bend. One side of the transition ring 53 smoothly transitions with the inner wall of the discharge cone 19, and the other side smoothly transitions with the inner wall of the discharge hopper 25, effectively preventing material from accumulating on the inner wall of the discharge flange 23, avoiding affecting the sealing performance, and making the discharge more thorough. The drive cylinder 55 can drive the discharge tongue 57 to move left and right. When the material is mixed, the discharge tongue 57 moves to the right so that it abuts against the transition ring 53 to complete the sealing of the discharge port 51. When discharging, the discharge tongue 57 moves to the left to disengage from the transition ring 53. The structure is stable and reliable.The isolation frame 54 keeps the cylinder 55 away from the rotating tank 3, preventing the cylinder 55 from operating in a high-temperature environment for extended periods, thereby extending its service life.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A heating and mixing device, characterized in that: The device includes a support, a medium-frequency induction heating structure, and a rotating tank horizontally mounted on the support. The medium-frequency induction heating structure includes a hollow copper tube surrounding the outer ring of the rotating tank, a coolant inside the hollow copper tube, and a power supply connected to the hollow copper tube. The rotating tank can rotate on the support. The rotating tank has a mixing structure inside, and one end of the rotating tank is provided with a feeding assembly and an air inlet pipe, while the other end of the rotating tank is provided with a discharging assembly and an exhaust pipe.

2. The heating and mixing device according to claim 1, characterized in that: The rotating tank has a feed cone on one side and a discharge cone on the other side. The feed cone is connected to the feed assembly, and the discharge cone is connected to the discharge assembly. The feed assembly includes a feed ring and a feed flange that are fixedly connected. The discharge assembly includes a discharge ring and a discharge flange that are fixedly connected. The feed flange and the discharge flange are fixedly connected to the support. The feed ring is provided with a feed pipe that communicates with the hopper. The discharge ring is provided with a discharge hopper.

3. The heating and mixing device according to claim 2, characterized in that: The feed cone is fitted with multiple cone sprockets, the support is equipped with a drive motor, and the drive motor shaft is equipped with a motor sprocket aligned with the cone sprockets. The motor sprocket and the cone sprockets are connected by a chain for transmission. Both the feed cone and the discharge cone are equipped with rings, and the support is equipped with multiple support rollers that can rest on the rings.

4. A heating and mixing device according to claim 1, 2, or 3, characterized in that: The hybrid structure includes a first helical blade and a second helical blade with opposite helical directions. The outer ring of the first helical blade is welded and fixed to the inner wall of the rotating tank. The outer diameter of the second helical blade is smaller than the inner diameter of the first helical blade, and the outer ring of the second helical blade and the inner ring of the first helical blade are connected by several connecting rods.

5. A heating and mixing device according to claim 2 or 3, characterized in that: The discharge cone has a discharge port. The inner wall of the discharge cone is provided with multiple guide plates. The guide plates extend from the right end of the discharge cone to the discharge port. The guide plates are generally arc-shaped, and the angle between the guide plates and the inner wall of the discharge cone is an acute angle. The guide plates and the discharge cone form a feeding groove. The inner wall of the discharge flange is provided with a transition ring. The middle of the transition ring bulges inward to form a bend. One side of the transition ring smoothly transitions with the inner wall of the discharge cone, and the other side smoothly transitions with the inner wall of the discharge hopper. The discharge hopper has an isolation frame. The outer end of the isolation frame is provided with a cylinder. The drive rod of the cylinder is inserted into the discharge hopper. The other end of the drive rod is provided with a discharge tongue that can abut against the transition ring.

6. A heating and mixing apparatus according to claim 2 or 3, characterized in that: The feed ring is equipped with a temperature sensor inserted into the feed cone, the feed pipe is equipped with a differential pressure sensor, the exhaust pipe is equipped with an oxygen sensor, and the outer ring of the rotating tank is equipped with a heat insulation material layer.

7. A heating and mixing apparatus according to claim 2 or 3, characterized in that: Thin-walled bearings and multiple graphite packing seal assemblies are provided between the feed ring and the feed cone, and between the discharge ring and the discharge cone. The feed ring and the discharge ring are provided with oil passages that communicate with the corresponding graphite packing seal assemblies, and the oil passage inlets are equipped with oil injection nozzles.

8. A heating and mixing apparatus according to claim 2 or 3, characterized in that: The inner rings of the feed ring and the discharge ring are each provided with multiple first grooves. The feed cone and the discharge cone are each provided with multiple second grooves that are offset from and communicate with the first grooves. The feed ring and the discharge ring are provided with air passages that communicate with the outermost first groove. The air passage inlet is provided with an air injection nozzle.

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