Splicing type graphite sagger

Abstract

The utility model relates to the technical field of battery anode and cathode material production and preparation devices, in particular to a spliced graphite sagger which comprises a frame body and a bottom plate which can be mutually connected to form a cavity, the frame body comprises a plurality of column feet and a plurality of side plates, and the adjacent column feet are connected through the side plates. The spliced graphite sagger is simple in structure, few in core parts and consistent in specification, if the same graphite sagger adopts column feet of the same specification and side plates of the same specification, the production efficiency of the spliced graphite sagger can be greatly improved, meanwhile, splicing is easy, firmness is high, the parts can be directly replaced under the condition that the parts are damaged, and the production cost is reduced. And the maintenance cost can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of battery positive and negative electrode material production and preparation equipment, and in particular to a spliced ​​graphite sagger. Background Technology

[0002] Graphite saggers are high-temperature resistant containers made primarily from high-purity artificial graphite. The raw materials are prepared through processes such as mixing, molding, isostatic pressing, calcination, impregnation, and graphitization, followed by machining. They can withstand extreme temperatures exceeding 2000℃, rapidly and evenly transferring heat to prevent localized overheating; they also resist corrosion from acids, alkalis, and molten metals. Therefore, they are widely used in the field of new energy lithium battery materials. For example, in lithium battery production, graphite saggers primarily serve as high-temperature resistant, high-thermal-conductivity sintering containers to support positive / negative electrode materials and ensure their structural stability and chemical purity during high-temperature processing, thereby improving battery capacity, cycle life, and safety.

[0003] There are two traditional methods for preparing graphite saggers. One is the mechanical excavation process, which uses artificial graphite blocks as raw materials and employs excavation and milling. This process suffers from extremely low raw material utilization (<20%), generates a large amount of waste, and has high recycling costs. Furthermore, the supply of artificial graphite blocks is limited, and the processing cycle is long, leading to a severe shortage of production capacity. The machining process also generates a large amount of dust particles, resulting in extremely high environmental remediation costs. The other method is compression molding and curing. This process relies on high-pressure molds and heating equipment, resulting in high initial equipment investment and a low yield rate of only 50%-60%. In addition, due to the difference in thermal expansion coefficients between graphite powder and petroleum coke, the density varies in different areas under compression. After molding, the material experiences concentrated thermal stress, resulting in a 30%-50% decrease in flexural strength and a porosity >20%. This leads to high brittleness, poor thermal shock stability, and a service life less than 1 / 5 of that achieved with the traditional process.

[0004] In view of the above-mentioned defects, Chinese invention patent CN114508943B discloses a combined graphite sagger and its forming method. This combined graphite sagger includes a base plate, multiple side plates, multiple graphite square pillars, and carbon fiber screws. The side plates are vertically arranged on the base plate around its perimeter, forming a box structure with cavities. The graphite square pillars are respectively arranged along the seams between the side plates and the base plate, and between the side plates themselves. Connecting holes are formed on the graphite square pillars, the base plate, and the side plates. The base plate, side plates, and graphite square pillars are fixed by the carbon fiber screws engaging with the connecting holes. The surface of the carbon fiber screws is covered with a carbonized layer, or the space between the carbon fiber screws and the inner wall of the connecting holes is filled with a carbonized layer or carbonized particles. The patent states that this solution solves the problems of high cost, complex processing, stress concentration, and mechanical defects in existing graphite saggers.

[0005] While the graphite square columns used in the above-mentioned solution, placed along the seams, can effectively distribute stress—specifically, the graphite square columns and carbon fiber screw connection structure at the seams described in the disclosed solution completely solves the problems of brittle fracture and cracking during use without increasing the thickness of the side plates—and furthermore, the graphite square columns at the seams can effectively prevent material leakage. However, practical experience has shown that although the graphite square columns and side / bottom plates are both made of graphite, differences in material batches or densities can lead to significant differences in their expansion rates at high temperatures (600-1400℃), resulting in stress cracking. In other words, uneven expansion at the seams generates shear stress, causing cracks at the connection between the graphite square columns and the side plates. After repeated thermal cycles, the carbon fiber screws may experience thread wear due to repeated stress, exacerbating the risk of loosening. On the one hand, in this design, the graphite square pillars only cover the surface of the joint and cannot completely fill the internal micro-gaps, which can easily cause joint sealing failure and material leakage. For example, when sintering lithium iron phosphate powder, powder with a particle size of about 10-20μm may seep into the joint from the edge of the graphite square pillars. On the other hand, at high temperatures, the graphite material shrinks, causing the gap between the square pillars and the side plates to widen (e.g., a difference in expansion coefficient of 0.5×10). -6 At 800℃, a 500mm long seam will produce a 0.2mm gap. On the other hand, the graphite square column must be strictly aligned with the connecting holes of the side plate / base plate (tolerance ≤ 0.1mm), otherwise forcibly screwing in the carbon fiber screws will damage the threads; especially when the processing error of the base plate's support exceeds 0.3mm, it will cause the side plate to tilt, resulting in the graphite square column not fitting the seam; in addition, when replacing the damaged side plate, the graphite square column needs to be disassembled with screws, and repeated operation may enlarge the connecting hole (e.g., the diameter of the M6 ​​threaded hole increases by 0.2mm after 5 disassemblies and reassemblies), resulting in dependence on installation accuracy and maintenance difficulties.

[0006] On the other hand, the publicly available solution uses a snap-fit ​​connection between the side plates, but at high temperatures, the graphite material may deform due to thermal expansion, causing misalignment of the snap-fit. This can lead to material leakage at the joint, affecting the sintering quality of the cathode material, and making it difficult to repeatedly disassemble and reassemble the snap-fit ​​after deformation, reducing the reusability of the crucible. As for the corner protectors, if they are added later, the bottom corner protector may detach due to thermal stress or mechanical impact if the connection with the side plate / bottom plate is not firm. If they are formed simultaneously with the side plate, the corner protector connection will become a new stress concentration point, accelerating structural damage.

[0007] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0008] The purpose of this invention is to overcome the problems of the prior art and provide a spliced ​​graphite sagger to solve the technical problems of stress cracking caused by the difference in thermal expansion coefficients at the splicing joint of the existing spliced ​​graphite sagger; the graphite column only covers the surface of the splice and cannot completely fill the internal micro gaps, resulting in failure of the splice seal and material leakage; as well as the technical problems of installation accuracy dependence and maintenance difficulty.

[0009] The above objectives are achieved through the following technical solutions:

[0010] A modular graphite sagger includes a frame and a base plate that can be connected to each other to form a cavity. The frame includes several column legs and several side plates, and adjacent column legs are connected by the side plates.

[0011] Furthermore, the frame and the base plate are made of graphite or carbon fiber and composite materials.

[0012] Furthermore, the frame is square, and there are four corresponding column feet and four side plates.

[0013] Furthermore, the upper surface of the base plate is provided with a central boss, and the periphery of the central boss and the edge of the base plate form a closed-loop support position; the support position includes a column foot support position located at the corner, and a side plate support position located between adjacent column foot support positions.

[0014] Furthermore, the column base is a right-angle column base, including a first column base right-angle side and a second column base right-angle side that are perpendicular to each other, and a left side plate limiting clamping groove and a right side plate limiting clamping groove are provided on the outer side of the first column base right-angle side and the second column base right-angle side to limit and clamp the side plate.

[0015] Furthermore, the outer side of the bottom of the column base is provided with an outwardly protruding right-angle corner, and correspondingly, the outer edge of the column base receiving position is provided with a corner receiving position corresponding to the position of the right-angle corner.

[0016] Furthermore, the side plate includes a baffle strip disposed on the bottom inner wall, the length of the baffle strip being less than the length of the side plate, and both ends of the baffle strip being limited and clamped by the outer edges of the two column feet on adjacent sides.

[0017] Furthermore, the thickness of the side plate is equal to the depth of the left side plate limiting groove and the right side plate limiting groove, and the thickness of the baffle is equal to the thickness of the outer side of the right-angled side of the first column base and the right-angled side of the second column base; the thickness of the side plate is equal to the thickness of the baffle.

[0018] Furthermore, it also includes a first insert plate and a second insert plate that can be plugged into each other to form a cross-shaped insert plate assembly, and slots are provided at the axial positions of the four stops for plugging in the first insert plate and the second insert plate.

[0019] Furthermore, a side plate groove is also provided on the top of the side plate.

[0020] This utility model provides a spliced ​​graphite sagger that uses column bases as connecting media between adjacent side plates, avoiding the cracking and deformation problems that easily occur at the splice points when the side plates are directly connected, thus effectively increasing the structural strength and stability. The specific connection method of the column bases and side plates ensures the robustness of the spliced ​​graphite sagger, effectively preventing stress cracking caused by differences in thermal expansion coefficients. Since there are no direct horizontal or longitudinal seams between the joints of each component and the cavity, the sealing performance of the seams is improved, preventing material leakage. This spliced ​​graphite sagger not only has a simple structure and few core components with consistent specifications (e.g., a single graphite sagger uses column bases and side plates of the same specifications), it greatly improves the production efficiency of the device. Furthermore, it is easy to assemble, highly robust, and allows for direct replacement of damaged components, effectively reducing maintenance costs. Attached Figure Description

[0021] Figure 1 This is a first-view structural diagram of a spliced ​​graphite sagger according to the present invention.

[0022] Figure 2 This is a second-view structural diagram of a spliced ​​graphite sagger according to the present invention;

[0023] Figure 3 This is an exploded view of a spliced ​​graphite sagger as described in this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the column base in the spliced ​​graphite sagger of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the side plate and baffle of the spliced ​​graphite sagger described in this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of a modular graphite sagger assembly with partitions according to the present invention.

[0027] Illustration markings:

[0028] 1-Frame, 101-Column base, 102-Side panel, 103-Right angle side of left column base, 104-Right angle side of right column base, 105-Left side panel limiting groove, 106-Right side panel limiting groove, 107-Right angle wrap, 108-Stop strip, 109-Slot, 110-Side panel groove;

[0029] 2-Base plate, 201-Central boss, 202-Supporting position, 203-, 204-Column base support position, 205-Side plate support position, 206-Corner support position;

[0030] 3-Cavity;

[0031] 4-Carbon fiber screws;

[0032] 5-Plug assembly, 501-First plug, 502-Second plug. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] like Figures 1-3 As shown, this solution provides a spliced ​​graphite sagger suitable for sintering positive / negative electrode materials of batteries. It includes a frame 1 and a base plate 2 that can be connected to each other to form a cavity 3. The frame 1 includes a plurality of pillars 101 and a plurality of side plates 102, and adjacent pillars 101 are connected by the side plates 102.

[0035] Compared to traditional contact-type connections between side plates, such as snap-fit ​​or interlocking joints, this embodiment uses a column base 101 with a thickness greater than that of the side plate 102 as a connecting medium between two adjacent side plates 102. That is, the same column base 101 is used to facilitate the connection of two side plates 102. With this structure, even if the graphite material may deform due to thermal expansion at high temperatures, the strong support of the column base 101 will prevent deformation at the connection between the side plate 102 and the column base 101, thus preventing material leakage at the joint and ensuring the sintering quality of the cathode material.

[0036] In this embodiment, the frame 1 is square, with four corresponding pillars 101 and four side plates 102. Specifically, the square shape ensures consistent strength across all parts, consistent stress distribution and temperature conduction during operation, and provides better sintering results for the battery's positive / negative electrode materials.

[0037] It should be noted that the frame 1 and the base plate 2 described in this embodiment are made of graphite material or carbon fiber and composite materials.

[0038] The graphite materials include:

[0039] Isostatic graphite: Prepared by isostatic pressing, it has isotropy, high density of over 1.78 g / cm³ and fine grain structure of 5-20 μm, and is suitable for precision applications such as neutron moderators in nuclear reactors and high-temperature molds.

[0040] High-purity graphite: with a carbon content of ≥99.9%, impurities are removed through flotation, high-temperature purification, or acid-base methods. It is used in high-tech fields such as semiconductor wafers, nuclear protection materials, and lithium battery anodes.

[0041] Medium-coarse graphite: with a particle size of 0.5-2.0 mm and a density of 1.55-1.75 kg / m³, it belongs to coarse-structured graphite and is mainly used in industrial applications such as metallurgical electrodes and refractory materials.

[0042] The carbon fibers and composite materials include:

[0043] Carbon fiber: Made of high-strength carbon fiber as the matrix, it is treated with high-temperature graphitization and has the characteristics of being lightweight, high-strength, and corrosion-resistant. It is used in aerospace, sports equipment and other fields.

[0044] Carbon-carbon composite materials: carbon matrix materials reinforced with carbon fibers, strengthened by vapor deposition process, have both low density (1.5-1.8 g / cm³) and ultra-high temperature stability (>2000℃), and are used in extreme environments such as aerospace thermal protection and high-speed rail braking systems.

[0045] The base plate 2 is connected to the column base 101, the base plate 2 is connected to the side plate 102, and the side plate 102 is connected to the column base 101 by carbon fiber screws 4 to enhance the firmness.

[0046] It should be noted that if carbon fiber screws 4 are used directly for connection, the screws often have missing teeth during processing. Using screws with missing teeth for fixing can easily lead to unreliable connections. Therefore, this solution is optimized as follows:

[0047] Optimization 1: A high-temperature resistant elastic ring, such as silicone or fluororubber, is pre-embedded at the root of the carbon fiber screw's thread. During installation, the elastic ring compresses and deforms, filling the thread gap and dispersing stress. This solution can be directly applied to the screw without additional processing; the cost of elastic materials is low, such as silicone rings, with a unit price of <0.1 yuan / piece; furthermore, it is compatible with existing screws and installation tools.

[0048] Optimization 2: Self-tapping screw + pre-drilled hole design. The carbon fiber screw is designed as a self-tapping type, with a pre-drilled through hole slightly smaller than the screw diameter and no pre-drilled thread. During installation, the screw self-cuts to form a matching thread. This solution eliminates the thread machining step, avoids the problem of missing teeth, and only requires adjustment of the hole size, keeping the processing cost of the graphite parts unchanged. In addition, the self-tapping thread has a high fault tolerance rate, and minor missing teeth do not affect the fastening.

[0049] Optimization 3: Pre-coating with high-temperature resin adhesive. A high-temperature resistant resin adhesive, such as modified phenolic resin, is pre-coated onto the screw thread surface. During installation, the adhesive fills the thread gaps, and after curing, forms a mechanical interlock. This method features a simple coating process, allowing for spraying or impregnation, and is cost-effective. The curing temperature is consistent with the crucible's operating temperature (200-300℃), eliminating the need for additional heating. Furthermore, the adhesive layer can compensate for thread machining errors.

[0050] Optimization 4: Replaceable threaded sleeves are pre-embedded in high-temperature resistant plastic threaded sleeves, such as PEEK, within the graphite connection holes. Carbon fiber screws are used in conjunction with these threaded sleeves, and the sleeves can be replaced individually if damaged. This solution offers low injection molding costs (<2 RMB / piece) for the threaded sleeves, requiring only simple pressing during installation without the need for specialized tools. It effectively prevents direct friction between the screw and graphite, extending the screw's lifespan.

[0051] Optimization 5: After assembly, the screw connection is locally heated to 200-300℃ using the secondary curing process. This utilizes the shrinkage characteristics of the carbon fiber resin matrix during secondary curing to automatically lock the threads. This solution directly utilizes the residual heat of the sintering furnace, resulting in zero additional cost. The curing shrinkage ensures a tighter thread contact, compensating for processing defects.

[0052] Optimization 6: A graphite lubricating coating is applied to the screw surface with a thickness of 10-20μm to reduce installation friction and minimize tooth breakage caused by forced screwing. This solution features a simple spraying process, low cost (<3 RMB / ㎡), and a high temperature resistance (>800℃) without affecting the sintering environment. Furthermore, the lubricity makes the screw easier to screw in, making it particularly suitable for parts with missing teeth.

[0053] like Figure 3 As shown, in this embodiment, the upper surface of the base plate 2 is provided with a central boss 201, and the periphery of the central boss 201 and the edge of the base plate 2 form a closed-loop support position 202. The support position 202 includes a column base support position 204 located at the corner, and a side plate support position 205 located between adjacent column base support positions 204. Through the column base support positions 204 and the side plate support positions 205, precise splicing of the column base 101 and the side plate 102 can be achieved, which can effectively improve the efficiency of splicing and assembly.

[0054] like Figure 4 As shown in the figure, as a specific embodiment of this solution, the column base 101 is a right-angle column base, including a right-angled left column base 103 and a right column base 104 that are perpendicular to each other, and a left side plate limiting groove 105 and a right side plate limiting groove 106 that can limit and clamp the side plate 102 are provided on the outer side of the left side plate 103 and the right side plate 104.

[0055] Specifically, the inner walls of the right-angled sides 103 and 104 of the left and right pillars 101, which are perpendicular to each other, are perpendicular to the outer wall of the central boss 201.

[0056] For the connection between the same column base 101 and the two adjacent side plates 102, one end of the left side plate 102 is connected to the left side plate limiting groove, and one end of the right side plate 102 is connected to the right side plate limiting groove 106. For the connection between the same side plate 102 and the two column bases 101 on its left and right sides, the left end of the side plate 102 is connected to the right side plate limiting groove 106 of the left column base, and the right end of the side plate 102 is connected to the left side plate limiting groove 105 of the right column base 101.

[0057] For further connection between the side plate and the left side plate limiting groove 105 and the right side plate limiting groove 106, the carbon fiber screws 4 can be used for connection, as described above.

[0058] like Figure 3 As shown, the outer side of the bottom of the column base 101 is also provided with an outwardly protruding right-angle corner 107. Correspondingly, the outer edge of the column base receiving position 204 is provided with a corner receiving position 206 corresponding to the position of the right-angle corner 107. By providing a right-angle corner 107 on the outer periphery of the bottom of the column base 101, the bottom area of ​​the column base 101 can be increased, thereby increasing the connection area between it and the base plate 2, forming a more stable connection. Under this structure, if multiple graphite saggers are stacked longitudinally, the graphite saggers located below, especially the bottommost ones, will not be damaged due to the pressure superimposed from above, such as the disintegration of the side plates caused by heavy pressure. As an optimization to facilitate stacking, this embodiment also provides a stacking limiting boss 203 corresponding to the position of the central boss 201 at the bottom of the base plate 2. The outer periphery of the stacking limiting boss 203 and the bottom edge of the base plate 2 form a closed-loop stacking position, which is used to stack and limit the top of the graphite saggers located below, ensuring stable stacking.

[0059] On the other hand, it can also limit the position of adjacent stacked graphite saggers to ensure that there is a certain gap between adjacent graphite saggers, such as the horizontal gap between each stack layer. This is beneficial for the gripping of the robot during placement and for the stability of the temperature around the graphite saggers during operation, thereby achieving uniform heating of the material inside the graphite saggers.

[0060] As an optimization of this embodiment, the right-angle corner protector 107 is integrally formed with the column base 101, and the corner protector receiving position 206 is integrally formed with the base plate 2. This not only facilitates processing but also prevents detachment due to thermal stress or mechanical impact.

[0061] like Figure 5As shown, in this embodiment, the side plate 102 includes a baffle 108 disposed on the bottom inner wall. The length of the baffle 108 is less than the length of the side plate 102, and both ends of the baffle 108 are limited and clamped by the outer edges of the two adjacent column feet 101. In this embodiment, the baffle 108 is integrally formed with the side plate 102. The length of the baffle 108 is less than the minimum distance between the two adjacent column feet 101, and the height of the baffle 108 is greater than the height of the central boss 201. The baffle 108 can occupy the remaining side plate receiving position 205 at the bottom of the side plate 102, so that the inner wall of the baffle 108 can abut against the side wall of the central boss 201. The left and right ends of the baffle 108 can abut against the outer edges of the right-angled sides 103 and 104 of the left and right column feet, respectively.

[0062] By limiting the structure described above, the splicing gaps between the components can be further minimized, preventing material leakage from the cavity 3.

[0063] In this embodiment, the thickness of the side plate 102 is equal to the depth of the left side plate limiting groove 105 and the right side plate limiting groove 106, and the thickness of the baffle 108 is equal to the thickness of the outer sides of the right-angled sides 103 and 104 of the left and right column bases; the thickness of the side plate 102 is equal to the thickness of the baffle 108. Furthermore, the side plate 102 and the baffle 108 are integrally formed, and this limitation further increases the overall connection strength of the graphite sagger.

[0064] like Figure 6 As shown, as an optimization of this spliced ​​graphite sagger, it also includes a first insert plate 501 and a second insert plate 502 that can be inserted into each other to form a cross-shaped insert plate assembly 5. Slots 109 are provided at the axial positions of the four baffles 108 to insert the first insert plate 501 and the second insert plate 502. The bottom of the first insert plate 501 and the second insert plate 502 abuts against the surface of the central boss 201, so as to divide the cavity 3 into four independent chambers to meet the purpose of sintering different materials simultaneously.

[0065] Furthermore, the structural stability of this modular graphite sagger is enhanced by the partition assembly 5, specifically as follows:

[0066] Deformation resistance: The partition assembly 8 serves as an internal support frame, which can reduce the probability of deformation of the graphite crucible at high temperatures of 800-1200℃ by 20-30% and reduce warping.

[0067] Preventing material collapse: After separation, the single-cavity loading capacity is reduced, avoiding the collapse problem caused by excessive powder accumulation.

[0068] like Figure 1As shown, as a further optimization of this spliced ​​graphite sagger, the top of the side plate 102 is also provided with a side plate groove 110. In this embodiment, the side plate groove 110 can be set as a trapezoid and located at the axial position of the side plate 102. When two graphite saggers are stacked longitudinally, the side plate grooves 110 of the four side plates of the lower graphite sagger and the bottom plate 2 of the upper graphite sagger form four exhaust ports, which are used to remove excess moisture brought in or generated during the sintering process of the material, ensure the normal sintering reaction of the material, and further improve the sintering effect of the positive / negative electrode material of the battery.

[0069] The above description is only for illustrating the embodiments of this utility model and is not intended to limit this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A spliced ​​graphite sagger, characterized in that, It includes a frame (1) and a base plate (2) that can be connected to each other to form a cavity (3). The frame (1) includes a number of column feet (101) and a number of side plates (102), and adjacent column feet (101) are connected by the side plates (102).

2. The spliced ​​graphite sagger according to claim 1, characterized in that, The frame (1) and the base plate (2) are made of graphite or carbon fiber and composite materials.

3. A spliced ​​graphite sagger according to claim 1 or 2, characterized in that, The frame (1) is square, and there are 4 corresponding column feet (101) and 4 side plates (102).

4. A spliced ​​graphite sagger according to claim 1, characterized in that, The upper surface of the base plate (2) is provided with a central boss (201), and the periphery of the central boss (201) and the edge of the base plate (2) form a closed-loop support position (202); the support position (202) includes a column foot support position (204) located at the corner, and a side plate support position (205) located between adjacent column foot support positions (204).

5. A spliced ​​graphite sagger according to claim 4, characterized in that, The column base (101) is a right-angle column base, including a right-angled left column base (103) and a right column base (104) that are perpendicular to each other. A left side plate limiting clamping groove (105) and a right side plate limiting clamping groove (106) are provided on the outer side of the left side plate (103) and the right side plate (104) to limit and clamp the side plate (102).

6. A spliced ​​graphite sagger according to claim 5, characterized in that, The outer side of the bottom of the column base (101) is also provided with an outwardly protruding right-angle corner (107), and correspondingly, the outer edge of the column base receiving position (204) is provided with a corner receiving position (206) corresponding to the position of the right-angle corner (107).

7. A spliced ​​graphite sagger according to claim 5, characterized in that, The side plate (102) includes a baffle (108) disposed on the bottom inner wall. The length of the baffle (108) is less than the length of the side plate (102), and the two ends of the baffle (108) are limited and clamped by the outer edges of the two column feet (101) on the adjacent sides.

8. A spliced ​​graphite sagger according to claim 7, characterized in that, The thickness of the side plate (102) is equal to the depth of the left side plate limiting groove (105) and the right side plate limiting groove (106), and the thickness of the baffle (108) is equal to the thickness of the outer side of the right angle side (103) of the left column foot and the right angle side (104) of the right column foot; the thickness of the side plate (102) is equal to the thickness of the baffle (108).

9. A spliced ​​graphite sagger according to claim 7, characterized in that, It also includes a first insert plate (501) and a second insert plate (502) that can be plugged into each other to form a cross-shaped insert plate assembly (5), and a slot (109) is provided at the axial position of the four stops (108) for plugging in the first insert plate (501) and the second insert plate (502).

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