Graphite sagger combination device

Abstract

The utility model relates to the technical field of lithium iron phosphate sintering, in particular to a graphite sagger combination device which comprises a sagger, grooves are formed in the upper ends of the four side faces of the sagger, chamfers are arranged at the corner angles of the bottom of the sagger, a boss is arranged on the bottom face of the sagger, and the sagger is placed in a kiln through a three-layer sagger stacking structure. An upper air inlet pipeline is installed at the upper end of the interior of the kiln and fixedly connected with an upper air inlet through a connector, an upper heating wire is arranged below the upper air inlet, a sagger is placed at the bottom of the upper heating wire, the bottoms of the three layers of stacked saggers make contact with the upper surface of a roller, and the improved sagger is of a structure with an opening in the side face. Space is reserved between the saggers, the gas heat transfer area is increased, the gas heat conduction efficiency is improved, and the sagger bottom and the sagger cover both adopt boss design to ensure the stability of the saggers during stacking. Nitrogen in the kiln is fed up and down together, so that heat transfer is more uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium iron phosphate sintering, in particular to a graphite sagger assembly device. Background Art

[0002] Lithium iron phosphate (LIFP) is currently one of the mainstream cathode materials for lithium batteries. With the recent recovery of the LFP battery market, the production of its corresponding cathode material, LFP, has also been rapidly expanding. Currently, the primary synthesis method for LFP is high-temperature sintering. Due to its excellent thermal conductivity, mechanical properties, high-temperature resistance, and corrosion resistance, graphite saggers are generally used for loading and transporting materials during the sintering process. As production expands, the requirements for kiln capacity are also increasing. Currently, the following methods are used to increase kiln capacity:

[0003] 1. Increase the bulk density of the material to be burned, thereby increasing the loading capacity of the sagger;

[0004] 2. Raising the height of the kiln and saggers. However, as the kiln capacity increases, many problems arise. The increase in the amount of kilns loaded and the height of the saggers will lead to poor stability of the materials in the saggers, difficulty in exhausting, greater differences in the heat received by the materials, and difficulty in heat dissipation, which will affect the stability of the product.

[0005] 3. The production capacity can be increased, more saggers are used, and the stability of the saggers in the kiln is reduced. If the stacking method is used, it is necessary to ensure smooth exhaust of the material reaction and the stability of the stacking.

[0006] In the process of realizing the present utility model, the inventors found that the existing technology had the following problems: 1. When the kiln increases its production capacity, the stability of the material during sintering decreases, the exhaust of the material in the sagger becomes more difficult, and the material is more likely to be ejected from the sagger; 2. When the kiln increases its production capacity, the heat dissipation becomes slower, and the temperature of the material in the cooling zone drops more slowly, resulting in a higher temperature of the material out of the kiln and an increased risk of oxidation. Utility Model Content

[0007] The purpose of the present invention is to provide a graphite sagger assembly device to solve the problems raised in the above-mentioned background technology. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a graphite sagger assembly device, comprising a sagger, the upper ends of the four side surfaces of the sagger are provided with grooves, the edges and corners of the bottom of the sagger are provided with chamfers, the bottom surface of the sagger is provided with a boss, the sagger is placed inside the kiln through a three-layer stacking structure, an upper air intake pipe is installed at the upper end of the interior of the kiln, the upper air intake pipe is fixedly connected to the upper air inlet through a connector, an upper heating wire is provided below the upper air inlet, both ends of the upper heating wire are connected to one side of the power transmission board, and the power transmission board is connected to the upper air inlet through a first The fixed plate is fixedly connected to the inner wall of the kiln, a sagger is placed at the bottom of the upper heating wire, the top of the sagger is covered with a sagger cover, the bottom of the sagger cover is provided with a sagger cover boss, the bottom of the three-layer stacked saggers is in contact with the upper surface of the roller, a lower heating wire is provided under the roller, both ends of the lower heating wire are connected to one side of the power transmission plate, the power transmission plate is fixedly connected to the inner wall of the kiln through the second fixed plate, a lower air inlet is provided at the bottom of the lower heating wire, the lower air inlet is fixedly connected to the lower air inlet pipe through a connector, and both ends of the lower air inlet pipe are fixed to the inner wall of the kiln.

[0008] Further preferably, the upper air inlet, the upper heating wire, the sagger, the roller, the lower heating wire, and the lower air inlet do not contact each other.

[0009] Further preferably, a plurality of connectors are equidistantly provided on the surface of the upper air inlet duct, the connectors are fixedly connected to the upper air inlet, the upper air inlet nozzle faces downward, the plurality of upper air inlet ducts are uniformly arranged laterally at the upper end of the interior of the kiln, and the two ends of the plurality of upper air inlet ducts are fixedly connected to the inner wall of the kiln, and a plurality of connectors are equidistantly provided on the surface of the lower air inlet duct, the connectors are fixedly connected to the lower air inlet, the lower air inlet nozzle faces upward, the plurality of lower air inlet ducts are uniformly arranged laterally at the lower end of the interior of the kiln, and the two ends of the plurality of lower air inlet ducts are fixedly connected to the inner wall of the kiln.

[0010] Further preferably, the roller rod is cylindrical in shape, a plurality of the roller rods are evenly arranged laterally, and both ends of the roller rods are fixed to the inner wall of the kiln.

[0011] Further preferably, the upper heating wire and the lower heating wire are spirally wound wire structures, and the upper heating wire and the lower heating wire are connected to the fixing plate through a power transmission plate.

[0012] Further preferably, the bottom and cover of the sagger are both designed with a raised shape, the height of the boss is less than the depth of the groove, the height of the sagger is determined to be 150-170 mm, the height of the kiln hearth is 1000-1100 mm, and the sagger is placed inside the kiln by stacking three layers.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In the utility model, the nitrogen gas ejected from the upper air inlet and the lower air inlet is heated by the heating wire to bake the material inside the sagger. The air inlet adopts a method of upper and lower common air intake, which makes heat transfer more uniform and rapid. The upper air inlet and the lower air inlet are arranged in a matrix. The nitrogen flow is sprayed into the kiln from the air inlet through the air inlet through the connector from the air inlet through the air inlet pipe, thereby increasing the air flow speed and improving the heat conduction rate.

[0015] In the present invention, there are gaps between the rollers to help the gas circulate better. Three layers of saggers are stacked on the roller layer. The rollers support and bear the weight of the saggers. The power transmission plate applies a certain voltage to the upper heating wire and the lower heating wire, causing the surface temperature of the heating wire to rise. The nitrogen flow will transfer heat to the air to achieve the effect of heating the kiln. The second layer of saggers is placed above the first layer of saggers. The position of the second layer of saggers is adjusted so that the four chamfers surround and fix the upper end of the side of the first layer of saggers. The non-groove position of the upper end of the first layer of saggers is placed between the boss and the chamfer at the bottom of the second layer of saggers. Not only is the material heated evenly during the heating process, but also the stability during stacking is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the longitudinal cross-sectional structure of the utility model kiln;

[0017] Figure 2 This is a schematic diagram of the deep longitudinal cross-section structure of the kiln of the utility model;

[0018] Figure 3 This is a schematic diagram of the main structure of the sagger of the utility model;

[0019] Figure 4 It is a schematic diagram of the longitudinal cross-section structure of the sagger of the present utility model.

[0020] In the figure: 1. sagger; 101. groove; 102. chamfer; 103. boss; 2. upper air inlet; 3. upper air inlet duct; 4. roller; 5. upper heating wire; 6. lower heating wire; 7. lower air inlet; 8. lower air inlet duct; 9. bowl cover; 901. bowl cover boss; 10. first fixing plate; 11. second fixing plate; 12. connector; 13. kiln; 14. power supply board. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] See also Figures 1 to 4 The utility model provides a technical solution: a graphite sagger assembly device, including a sagger 1, the upper ends of the four side surfaces of the sagger 1 are provided with grooves 101, the corners of the bottom of the sagger 1 are provided with chamfers 102, and the bottom surface of the sagger 1 is provided with a boss 103. The sagger 1 is placed inside a kiln 13 through a three-layer stacking structure. An upper air intake pipe 3 is installed at the upper end of the kiln 13. The upper air intake pipe 3 is fixedly connected to the upper air inlet 2 through a connector 12. An upper heating wire 5 is provided below the upper air inlet 2. Both ends of the upper heating wire 5 are connected to one side of a power transmission board 14. The power transmission board 14 is connected to the power transmission board 14 through a first fixing plate 1 0 is fixedly connected to the inner wall of the kiln 13, a sagger 1 is placed at the bottom of the upper heating wire 5, the top of the sagger 1 is covered with a sagger cover 9, and a sagger cover boss 901 is provided at the bottom of the three-layer stacked saggers. The bottom of the three-layer stacked saggers is in contact with the upper surface of the roller 4. A lower heating wire 6 is provided below the roller 4. Both ends of the lower heating wire 6 are connected to one side of the power transmission plate 14. The power transmission plate 14 is fixedly connected to the inner wall of the kiln 13 through the second fixing plate 11. A lower air inlet 7 is provided at the bottom of the lower heating wire 6. The lower air inlet 7 is fixedly connected to the lower air inlet pipe 8 through a connector 12. Both ends of the lower air inlet pipe 8 are fixed to the inner wall of the kiln 13.

[0023] In this embodiment, Figure 1 As shown, the upper air inlet 2, the upper heating wire 5, the sagger 1, the roller 4, the lower heating wire 6, and the lower air inlet 7 do not contact each other; the nitrogen ejected from the upper air inlet 2 and the lower air inlet 7 is heated by the heating wire to bake the material inside the sagger 1. The air inlet adopts a joint upper and lower air intake method, which makes heat transfer more uniform and rapid.

[0024] In this embodiment, Figure 1 As shown, a plurality of connectors 12 are equidistantly provided on the surface of the upper air inlet duct 3, the connectors 12 are fixedly connected to the upper air inlet 2, the nozzle of the upper air inlet 2 is facing downward, and the plurality of upper air inlet ducts 3 are uniformly arranged laterally at the upper end of the interior of the kiln 13, and the two ends of the plurality of upper air inlet ducts 3 are fixedly connected to the inner wall of the kiln 13; a plurality of connectors 12 are equidistantly provided on the surface of the lower air inlet duct 8, the connectors 12 are fixedly connected to the lower air inlet 7, the nozzle of the lower air inlet 7 is facing upward, and the plurality of lower air inlet ducts 8 are uniformly arranged laterally at the lower end of the interior of the kiln 13, and the two ends of the plurality of lower air inlet ducts 8 are fixedly connected to the inner wall of the kiln 13; the upper air inlet 2 and the lower air inlet 7 are arranged in a matrix, and the nitrogen flow is sprayed into the kiln 13 from the air inlet through the connector 12 from the air inlet of the air inlet, thereby increasing the air flow velocity and improving the heat conduction rate.

[0025] In this embodiment, Figure 1 As shown, the roller rods 4 are cylindrical in shape, and multiple roller rods 4 are evenly arranged horizontally. Both ends of the roller rods 4 are fixed to the inner wall of the kiln 13; there are gaps between the roller rods 4 to help gas flow better, and the three layers of saggers 1 are stacked on the roller rods 4. The roller rods 4 support and bear the weight of the saggers 1.

[0026] In this embodiment, Figure 1 As shown, the upper heating wire 5 and the lower heating wire 6 are spirally wound wire structures, and the upper heating wire 5 and the lower heating wire 6 are connected to the fixed plate through the power transmission plate 14; the power transmission plate 14 applies a certain voltage to the upper heating wire 5 and the lower heating wire 6, causing the surface temperature of the heating wire to increase, and the nitrogen flow will transfer the heat to the air to achieve the effect of heating the kiln 13.

[0027] In this embodiment, Figure 1 As shown, the bottom of the sagger 1 and the sagger cover 9 both adopt a convex design, the height of the boss 103 is less than the depth of the groove 101, the height of the sagger 1 is determined to be 150-170 mm, the height of the furnace of the kiln 13 is 1000-1100 mm, and the sagger 1 is placed inside the kiln 13 in a three-layer stacking manner; the second layer of sagger 1 is placed above the first layer of sagger 1, and the position of the second layer of sagger 1 is adjusted so that the four chamfers 102 surround and fix the upper end of the side of the first layer of sagger 1, and the upper end of the first layer of sagger 1 not having the groove 101 is placed between the boss 103 and the chamfer 102 at the bottom of the second layer of sagger 1, which not only makes the material heated evenly during the heating process, but also improves the stability during stacking.

[0028] The use method and advantages of the utility model: When the graphite sagger assembly device is used, the working process is as follows:

[0029] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, first check whether the status of the heating device and the air guide device of the kiln 13 is normal, arrange the saggers 1 filled with materials neatly on the upper surface of the roller rod 4 layer, place the second layer of saggers 1 above the first layer of saggers 1, adjust the position of the second layer of saggers 1 so that the four chamfers 102 surround and fix the upper end of the side of the first layer of saggers 1, and the non-groove 101 position of the upper end of the first layer of saggers 1 is placed between the bottom boss 103 and the chamfer 102 of the second layer of saggers 1. The third layer of saggers 1 is placed above the second layer of saggers 1. The placement requirements are similar. Cover the upper surface of the third layer of saggers 1 with a bowl. Cover 9, adjust the position of the bowl cover 9 so that the non-groove 101 position of the upper end of the third layer of sagger 1 is placed outside the bowl cover boss 901, close the kiln 13 and start the heating device, and the power supply board 14 applies a certain voltage to the upper heating wire 5 and the lower heating wire 6, causing the surface temperature of the heating wire to rise. The upper air inlet 2 and the lower air inlet 7 are arranged in a matrix, and the nitrogen flow is sprayed into the kiln 13 from the air inlet through the connector 12 from the air inlet pipe. The nitrogen flow transfers the heat on the surface of the heating wire to the air, and baking begins. When baking is completed, the material can be taken out after cooling.

[0030] The above shows and describes the basic principles, main features, and advantages of the present invention. Persons skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A graphite sagger assembly device, comprising a sagger (1), characterized in that: The upper ends of the four side surfaces of the sagger (1) are provided with grooves (101), the corners of the bottom of the sagger (1) are provided with chamfers (102), and the bottom surface of the sagger (1) is provided with a boss (103). The sagger (1) is placed inside the kiln (13) through a three-layer stacking structure. An upper air intake pipe (3) is installed at the upper end of the interior of the kiln (13). The upper air intake pipe (3) is fixedly connected to the upper air inlet (2) through a connector (12). An upper heating wire (5) is provided below the upper air inlet (2). Both ends of the upper heating wire (5) are connected to one side of a power transmission plate (14). The power transmission plate (14) is fixedly connected to the inner wall of the kiln (13) through a first fixing plate (10). A sagger (1) is placed at the bottom of the hot wire (5), and the top of the sagger (1) is covered with a sagger cover (9). The bottom of the sagger cover (9) is provided with a sagger cover boss (901). The bottom of the sagger (1) contacts the upper surface of the roller (4). A lower heating wire (6) is provided below the roller (4). Both ends of the lower heating wire (6) are connected to one side of a power transmission plate (14). The power transmission plate (14) is fixedly connected to the inner wall of the kiln (13) through a second fixed plate (11). A lower air inlet (7) is provided at the bottom of the lower heating wire (6). The lower air inlet (7) is fixedly connected to a lower air inlet pipe (8) through a connector (12). Both ends of the lower air inlet pipe (8) are fixed to the inner wall of the kiln (13).

2. The graphite sagger assembly device according to claim 1, characterized in that: The upper air inlet (2), the upper heating wire (5), the sagger (1), the roller (4), the lower heating wire (6), and the lower air inlet (7) do not contact each other.

3. The graphite sagger assembly device according to claim 1, characterized in that: The surface of the upper air intake pipe (3) is provided with a plurality of connectors (12) at equal intervals, the connectors (12) are fixedly connected to the upper air intake port (2), the nozzle of the upper air intake port (2) faces downward, the plurality of upper air intake pipes (3) are evenly arranged transversely at the upper end of the interior of the kiln (13), and the two ends of the plurality of upper air intake pipes (3) are fixedly connected to the inner wall of the kiln (13), and the surface of the lower air intake pipe (8) is provided with a plurality of connectors (12) at equal intervals, the connectors (12) are fixedly connected to the lower air intake port (7), the nozzle of the lower air intake port (7) faces upward, the plurality of lower air intake pipes (8) are evenly arranged transversely at the lower end of the interior of the kiln (13), and the two ends of the plurality of lower air intake pipes (8) are fixedly connected to the inner wall of the kiln (13).

4. The graphite sagger assembly device according to claim 1, characterized in that: The roller rod (4) is cylindrical in shape, and a plurality of the roller rods (4) are evenly arranged laterally. Both ends of the roller rod (4) are fixed to the inner wall of the kiln (13).

5. The graphite sagger assembly device according to claim 1, characterized in that: The upper heating wire (5) and the lower heating wire (6) are spirally wound wire structures, and the upper heating wire (5) and the lower heating wire (6) are connected to the fixing plate via a power transmission plate (14).

6. The graphite sagger assembly device according to claim 1, characterized in that: The bottom of the sagger (1), the sagger (1) and the sagger cover (9) all adopt a convex design, the height of the boss (103) is less than the depth of the groove (101), the height of the sagger (1) is determined to be 150-170 mm, the height of the furnace of the kiln (13) is 1000-1100 mm, and the sagger (1) is placed inside the kiln (13) in a three-layer stacking manner.

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