A combined charging frame for a pit furnace

Abstract

The utility model relates to the technical field of material frame, concretely relates to a shaft furnace combined material frame, include: the vertical superposition of annular material frame structure not less than 2 layers is arranged, annular material frame structure includes a plurality of annular array setting sector material frame subassembly, sector material frame subassembly includes sector hollow tray, 2 fixed link piece no.

Description

Technical Field

[0001] This utility model relates to the field of material frame technology, and in particular to a combined material frame for a pit furnace. Background Technology

[0002] In the process of processing small roller products in a large pit furnace, the tooling frame, as the enclosure carrier, directly affects the utilization rate of furnace space and production efficiency. Existing tooling frames typically consist of a pallet and surrounding side panels forming the enclosure structure. The side panels prevent workpieces from slipping off. While the process design of stacking multiple tooling frames can improve space utilization, it also places higher demands on the performance of the tooling frames: they must be able to support a large number of workpieces while meeting the requirements of structural stability and resistance to deformation, lightweight and easy operation, convenient lifting, and efficient space utilization.

[0003] Regarding the aforementioned technologies, the inventors discovered two major problems with existing material frames: First, the side plates adopt a vertical rib load-bearing structure, which, when stacked, not only needs to bear the weight of the workpiece but also the load of the upper material frame, making it prone to twisting and deformation due to overload; Second, the integral structural design leads to a surge in manufacturing difficulty when producing large-sized material frames, resulting in a decrease in the pass rate; Moreover, during later maintenance, it is difficult to conduct partial repairs and replacements of the integral structure, significantly increasing maintenance costs and difficulties. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a combined material frame for a pit furnace, which reduces the deformation of the fan-shaped material frame components due to gravity caused by stacking, and reduces the difficulty of manufacturing and maintenance.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A combined material frame for a pit furnace is provided, comprising: at least two layers of vertically stacked annular material frame structures; the annular material frame structure includes several fan-shaped material frame components arranged in a circular array; each fan-shaped material frame component includes a fan-shaped hollowed-out tray, two fixing rods (first and second); the upper surface of the fan-shaped hollowed-out tray has a wavy outer arc plate near the outer arc edge and a wavy inner arc plate near the inner arc edge; the fan-shaped hollowed-out... The upper surface of the tray is provided with wavy side arc plates near both sides. The two ends of the wavy outer arc plate are connected to the corresponding wavy side arc plate by fixing rod one. The two ends of the wavy inner arc plate are connected to the corresponding wavy side arc plate by fixing rod two. Fixing rod one and fixing rod two are detachably connected to the fan-shaped hollow tray. The wavy outer arc plate, wavy inner arc plate and wavy side arc plate are all hollow structure designs and have the same height.

[0006] By adopting the above technical solution, during installation, the wavy outer arc plate is connected to the corresponding wavy side arc plate via fixing rod one, and the wavy inner arc plate is connected to the corresponding wavy side arc plate via fixing rod two. Both fixing rod one and fixing rod two are detachably connected to the fan-shaped hollow tray, thus constructing a fan-shaped material frame assembly that facilitates the carrying of workpieces. Multiple fan-shaped material frame assemblies arranged in a circular array form a circular material frame structure; furthermore, multiple circular material frame structures are stacked to ultimately form a multi-layer composite material frame. This composite stacking design has significant advantages: firstly, the modular structure makes maintenance and replacement of individual components more convenient, greatly reducing the difficulty of later maintenance; secondly, the orderly stacking layout fully fits the internal space of the pit furnace, significantly improving space utilization. From a structural mechanics perspective, the wave-shaped outer arc plate, wave-shaped inner arc plate, and wave-shaped side arc plate all adopt a wave-shaped curved surface design. This innovative design can efficiently decompose the concentrated gravity load generated by stacking into multiple component forces, effectively suppressing the deformation of the fan-shaped frame assembly caused by gravity, and providing a stable and reliable guarantee for the workpiece to bear the load.

[0007] In a preferred embodiment, the present invention can be further configured as follows: the wavy outer arc plate includes an outer arc frame and a wavy plate connected to its inner wall, wherein the wavy plate is provided with a plurality of hollow holes at intervals.

[0008] By adopting the above technical solution, the arc-shaped contour design of the outer arc frame and the wave-shaped surface of the wave plate form a unique mechanical structural system. This design breaks through the limitations of traditional flat plate load-bearing, and can cleverly disperse the concentrated gravitational load generated when stacked into multiple directional components. Through this mechanical dispersion mechanism, the problem of local stress concentration is effectively alleviated, and the risk of deformation of the fan-shaped frame assembly under gravity is significantly reduced.

[0009] In a preferred embodiment, the present invention can be further configured such that the wave-shaped inner arc plate includes an inner arc frame and a wave-shaped plate II connected to its inner wall, wherein the wave-shaped plate II is provided with a plurality of hollow holes II at intervals.

[0010] By adopting the above technical solution, the arc-shaped contour design of the inner arc frame and the wave-shaped surface of the second wave plate constitute a unique mechanical structural system. This design breaks through the limitations of traditional flat plate load-bearing, and can cleverly disperse the concentrated gravitational load generated during stacking into multiple directional components. Through this mechanical dispersion mechanism, the problem of local stress concentration is effectively alleviated, and the risk of deformation of the fan-shaped frame assembly under gravity is significantly reduced.

[0011] In a preferred embodiment, the present invention can be further configured such that: the wavy side arc-shaped plate includes a rectangular frame and a wavy plate three connected to its inner wall, and the wavy plate three is provided with a plurality of hollow holes three at intervals.

[0012] By adopting the above technical solution, the wave-shaped surface design of the three-wave plate can cleverly disperse the concentrated gravitational load generated during stacking into multiple directional components. This effectively alleviates the problem of local stress concentration and significantly reduces the risk of deformation of the fan-shaped frame assembly under gravity.

[0013] In a preferred embodiment, the present invention can be further configured as follows: hexagonal countersunk holes are provided at the four corners of the fan-shaped hollow tray; the fixing rod includes a bolt body; a fixing tube and at least two fixing tubes are fitted onto the bolt body; a connecting plate is connected between the outer circle of the fixing tube and the wavy outer arc plate; a connecting plate is connected between the outer circle of the fixing tube and the wavy side arc plate; and the bolt body passes through the hexagonal countersunk holes and is spirally connected to the upper end with a locking nut.

[0014] The second fixing member includes a bolt body, on which a fixing tube three and at least two fixing tubes four are fitted. A connecting plate three connects the outer circle of the fixing tube three to the wavy inner arc plate. A connecting plate four connects the outer circle of the fixing tube four to the wavy side arc plate. The bolt body two passes through a hexagonal countersunk hole and is screwed to the upper end with a locking nut two.

[0015] By adopting the above technical solution, during installation, bolt body one is passed through the hexagonal countersunk hole on the fan-shaped hollow tray, and then fixing tube one and fixing tube two are sequentially fitted onto the outer circle of bolt body one from top to bottom. Then, locking nut one is screwed onto the threaded end of bolt body one, thereby achieving a detachable connection of the wavy outer arc plate, the wavy side arc plate, and the fan-shaped hollow tray, improving the convenience of installation and disassembly. Bolt body two is passed through the hexagonal countersunk hole on the fan-shaped hollow tray, and then fixing tube three and fixing tube four are sequentially fitted onto the outer circle of bolt body two from top to bottom. Then, locking nut two is screwed onto the threaded end of bolt body two, thereby achieving a detachable connection of the wavy inner arc plate, the wavy side arc plate, and the fan-shaped hollow tray, improving the convenience of installation and disassembly.

[0016] In a preferred embodiment, the present invention can be further configured such that: a plurality of threaded connection holes are spaced apart on the fan-shaped hollow tray, and a support column is spirally connected in the threaded connection hole, the top of the support column being flush with the top of the wave-shaped outer arc plate.

[0017] By adopting the above technical solution, the support column is tightly screwed into the threaded connection hole of the fan-shaped hollow tray in a spiral manner, forming a stable support structure. This allows the support column to effectively bear the gravity load of the upper fan-shaped material frame assembly and evenly transmit the pressure to the lower structure. Through the supporting effect of the support column, the stress deformation of the fan-shaped hollow tray in the upper fan-shaped material frame assembly is significantly reduced, effectively improving the overall stability and load-bearing reliability when multiple material frames are stacked.

[0018] In a preferred embodiment, the present invention can be further configured such that: a snap-fit ​​component is provided between adjacent fan-shaped material frame components in the vertical direction, which is suitable for preventing the fan-shaped material frame components from sliding horizontally;

[0019] The snap-fit ​​assembly includes at least two snap-fit ​​pieces spaced apart on the outer arc edge of the fan-shaped material frame assembly, and at least two snap-fit ​​pieces spaced apart on both sides of the fan-shaped material frame assembly.

[0020] The snap-fit ​​component includes a first slot disposed on the outer arc surface of the fan-shaped hollow tray and a first U-shaped snap plate adapted to the first slot, wherein the first U-shaped snap plate is connected to the top of the wave-shaped outer arc plate.

[0021] The second snap-fit ​​component includes a second slot disposed on the side of the fan-shaped hollow tray and a second U-shaped snap-fit ​​plate adapted to the second slot. The second U-shaped snap-fit ​​plate is connected to the top of the wavy side arc plate.

[0022] By adopting the above technical solution, the first U-shaped clamping plate on the lower sector-shaped material frame assembly is tightly inserted into the corresponding first clamping slot on the upper sector-shaped material frame assembly, while the second U-shaped clamping plate is precisely embedded into the second clamping slot on the upper sector-shaped material frame assembly. Through the three-dimensional spatial constraint, the horizontal displacement of the sector-shaped material frame assembly is effectively prevented, ensuring that the multi-layered stacked structure maintains high stability under load conditions.

[0023] In summary, this utility model has at least one of the following beneficial technical effects:

[0024] 1. A fan-shaped hollowed-out tray, a wave-shaped outer arc plate, a wave-shaped inner arc plate, and a wave-shaped side arc plate are detachably connected by fixing rod one and fixing rod two to construct a fan-shaped material frame assembly. Multiple fan-shaped material frame assemblies are arranged in a ring array to form a ring material frame structure. The ring material frame structure is stacked to form a combined material frame, which enhances the convenience of maintenance. The regular stacking layout fully fits the internal space of the pit furnace and improves the space utilization rate inside the pit furnace.

[0025] 2. The wavy outer arc plate, the wavy inner arc plate, and the wavy side arc plate all adopt a wavy curved surface design to decompose the load and suppress deformation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0027] Figure 1 This is a schematic diagram of a preferred embodiment of a combined material frame for a pit furnace according to the present invention.

[0028] Figure 2 yes Figure 1 A schematic diagram of the connection between the central sector-shaped material frame assembly and the snap-fit ​​assembly.

[0029] Figure 3 yes Figure 2 A schematic diagram of the structure of a central fan-shaped hollowed-out tray.

[0030] Figure 4 yes Figure 2 A schematic diagram of the structure connecting the central fan-shaped hollow tray, the fixing rod, the wavy outer arc plate, and the wavy side arc plate.

[0031] Figure 5 yes Figure 2 A schematic diagram of the structure connecting the central fan-shaped hollow tray, the fixing rod, the wave-shaped inner arc plate, and the wave-shaped side arc plate.

[0032] In the diagram: 10. Sector-shaped material frame assembly; 2. Hexagonal countersunk hole; 3. Threaded connection hole; 4. Support column;

[0033] 50. Snap-fit ​​assembly;

[0034] 11. Fan-shaped hollowed-out tray; 12. Fixing rod one; 13. Fixing rod two; 14. Wave-shaped outer arc.

[0035] 15. Wavy inner arc panel; 16. Wavy side arc panel;

[0036] 121. Bolt body one; 122. Fixing pipe one; 123. Fixing pipe two; 124. Connecting plate one; 125. Connecting plate two; 126. Locking nut one;

[0037] 131. Bolt body two; 132. Fixing pipe three; 133. Fixing pipe four; 134. Connecting plate three; 135. Connecting plate four; 136. Locking nut two;

[0038] 141. Outer arc frame; 142. One wave-shaped plate; 143. One perforated hole;

[0039] 151. Inner arc frame; 152. Wave-shaped plate II; 153. Hole II;

[0040] 161. Rectangular frame; 162. Three wavy panels; 163. Three perforated holes;

[0041] 51. Snap-on component one; 52. Snap-on component two; 511. First slot; 512. First U-shaped card plate; 521. Second slot; 522. Second U-shaped card plate. Detailed Implementation

[0042] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0043] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0044] Reference Figures 1-5 This utility model discloses a combined material frame for a pit-type furnace, comprising: at least two layers of vertically stacked annular material frame structures; the annular material frame structure includes several fan-shaped material frame components 10 arranged in annular arrays; each fan-shaped material frame component 10 includes a fan-shaped hollow tray 11, two fixing rods 12 and two fixing rods 13; the upper surface of the fan-shaped hollow tray 11 has a wavy outer arc plate 14 near the outer arc edge and a wavy inner arc plate 15 near the inner arc edge; the upper surface of the fan-shaped hollow tray 11 is further divided into two sections near the two sides. A wavy side arc plate 16 is provided. The two ends of the wavy outer arc plate 14 are respectively connected to the corresponding wavy side arc plate 16 through fixing rod 12. The two ends of the wavy inner arc plate 15 are respectively connected to the corresponding wavy side arc plate 16 through fixing rod 2 13. Fixing rod 12 and fixing rod 12 are detachably connected to the fan-shaped hollow tray 11. The wavy outer arc plate 14, the wavy inner arc plate 15 and the wavy side arc plate 16 are all hollow structure designs and have the same height.

[0045] The wavy outer arc-shaped plate 14 includes an outer arc-shaped frame 141 and a wavy plate 142 connected to its inner wall. The wavy plate 142 has several spaced perforations 143. The arc-shaped profile of the outer arc-shaped frame 141 and the wavy surface of the wavy plate 142 form a unique mechanical structural system. This design breaks through the limitations of traditional flat plate load-bearing, cleverly dispersing the concentrated gravitational load generated during stacking into multiple directional components. Through this mechanical dispersion mechanism, the problem of local stress concentration is effectively alleviated, significantly reducing the risk of deformation of the fan-shaped frame assembly 10 under gravity. The outer arc-shaped frame 141 and the wavy plate 142 are integrally cast, enhancing structural stability.

[0046] The wave-shaped inner arc plate 15 includes an inner arc frame 151 and a wave-shaped plate 152 connected to its inner wall. The wave-shaped plate 152 has several spaced perforations 153. The arc-shaped contour design of the inner arc frame 151 and the wave-shaped surface of the wave-shaped plate 152 constitute a unique mechanical structural system. This design breaks through the limitations of traditional flat plate load-bearing, cleverly dispersing the concentrated gravitational load generated during stacking into multiple directional components. Through this mechanical dispersion mechanism, the problem of local stress concentration is effectively alleviated, significantly reducing the deformation risk of the fan-shaped frame assembly 10 under gravity. The inner arc frame 151 and the wave-shaped plate 152 are integrally cast, enhancing structural stability.

[0047] The wave-shaped side arc plate 16 includes a rectangular frame 161 and a wave-shaped plate 162 connected to its inner wall. The wave-shaped plate 162 has several perforated holes 163 spaced apart. The wave-shaped curved surface of the wave-shaped plate 162 can cleverly disperse the concentrated gravitational load generated when stacked into components in multiple directions; effectively alleviate the problem of local stress concentration and significantly reduce the risk of deformation of the fan-shaped frame assembly 10 under gravity; the rectangular frame 161 and the wave-shaped plate 162 are integrally cast, which enhances the structural stability.

[0048] The fan-shaped hollow tray 11 has hexagonal countersunk holes 2 at its four corners. The fixing rod 12 includes a bolt body 121, on which a fixing tube 122 and at least two fixing tubes 123 are fitted. A connecting plate 124 connects the outer circle of the fixing tube 122 to the wavy outer arc plate 14. A connecting plate 125 connects the outer circle of the fixing tube 123 to the wavy side arc plate 16. The bolt body 121 passes through the hexagonal countersunk holes 2 and is screwed at the top. A locking nut 126 is screwed onto the bolt body 131. The bolt body 131 is fitted with a fixing tube 132 and at least two fixing tubes 133. A connecting plate 134 connects the outer circle of the fixing tube 132 to the wavy inner arc plate 15. A connecting plate 135 connects the outer circle of the fixing tube 133 to the wavy side arc plate 16. The bolt body 131 passes through the hexagonal countersunk hole 2 and is screwed onto the upper end with a locking nut 136. During installation, bolt body 121 is passed through the hexagonal countersunk hole 2 on the fan-shaped hollow tray 11. Then, fixing tube 122 and fixing tube 2 123 are sequentially fitted onto the outer circle of bolt body 121 from top to bottom. Finally, locking nut 126 is screwed onto the threaded end of bolt body 121, thereby achieving a detachable connection between the wavy outer arc plate 14, the wavy side arc plate 16, and the fan-shaped hollow tray 11, improving the convenience of installation and disassembly. Bolt body 2 131 is passed through the hexagonal countersunk hole 2 on the fan-shaped hollow tray 11. Then, fixing tube 3 132 and fixing tube 4 133 are sequentially fitted onto the outer circle of bolt body 2 131 from top to bottom. Finally, locking nut 2 136 is screwed onto the threaded end of bolt body 2 131, thereby achieving a detachable connection between the wavy inner arc plate 15, the wavy side arc plate 16, and the fan-shaped hollow tray 11, improving the convenience of installation and disassembly.

[0049] The fan-shaped hollow tray 11 is provided with several threaded connection holes 3 at intervals. Support columns 4 are spirally connected to the threaded connection holes 3, and the top of the support columns 4 is flush with the top of the wavy outer arc plate 14. The support columns 4 are tightly screwed into the threaded connection holes 3 of the fan-shaped hollow tray 11, forming a stable support structure. This allows the support columns 4 to effectively bear the gravity load of the upper fan-shaped material frame assembly 10 and evenly transmit the pressure to the lower structure. Through the supporting effect of the support columns 4, the stress deformation of the fan-shaped hollow tray 11 in the upper fan-shaped material frame assembly 10 is significantly reduced, effectively improving the overall stability and load-bearing reliability when multiple material frames are stacked.

[0050] A snap-fit ​​assembly 50 is provided between adjacent fan-shaped material frame assemblies 10 in the vertical direction to prevent the fan-shaped material frame assemblies 10 from sliding horizontally. The snap-fit ​​assembly 50 includes at least two snap-fit ​​pieces 51 spaced apart on the outer arc side of the fan-shaped material frame assembly 10 and at least two snap-fit ​​pieces 52 spaced apart on both sides of the fan-shaped material frame assembly 10. The snap-fit ​​piece 51 includes a first slot 511 on the outer arc surface of the fan-shaped hollow tray 11 and a first U-shaped plate 512 adapted to the first slot 511. The first U-shaped plate 512 is connected to the top of the wavy outer arc plate 14. The snap-fit ​​piece 52 includes a second slot 521 on the side of the fan-shaped hollow tray 11 and a second U-shaped plate 522 adapted to the second slot 521. The second U-shaped plate 522 is connected to the top of the wavy side arc plate 16. The first U-shaped clamping plate 512 on the lower sector-shaped material frame assembly 10 is tightly inserted into the corresponding first clamping slot 511 on the upper sector-shaped material frame assembly 10, while the second U-shaped clamping plate 522 is precisely embedded into the second clamping slot 521 on the upper sector-shaped material frame assembly 10. Through the three-dimensional spatial constraint, the sector-shaped material frame assembly 10 is effectively prevented from displacing in the horizontal direction, ensuring that the multi-layer stacked structure remains highly stable under load conditions.

[0051] The implementation principle of this embodiment is as follows: During installation, the wavy outer arc plate 14 is connected to the corresponding wavy side arc plate 16 via fixing rod 12, and the wavy inner arc plate 15 is connected to the corresponding wavy side arc plate 16 via fixing rod 2 13. Both fixing rod 12 and fixing rod 2 13 are detachably connected to the fan-shaped hollow tray 11, thereby constructing a fan-shaped material frame assembly 10 that is convenient for carrying workpieces. Arranging multiple fan-shaped material frame assemblies 10 in a circular array can form a circular material frame structure; on this basis, multiple circular material frame structures are superimposed to finally form a multi-layer combined material frame. This combined superposition design has significant advantages: on the one hand, the modular structure makes the maintenance and replacement of individual components more convenient, greatly reducing the difficulty of later maintenance; on the other hand, the regular superposition layout fully fits the internal space of the pit furnace, significantly improving the space utilization rate. From the perspective of structural mechanics, the wave-shaped outer arc plate 14, the wave-shaped inner arc plate 15, and the wave-shaped side arc plate 16 all adopt a wave-shaped curved surface design. This innovative design can efficiently decompose the concentrated gravity load generated by stacking into multiple component forces, effectively suppress the deformation of the fan-shaped material frame assembly 10 caused by gravity, and provide a stable and reliable guarantee for the workpiece to bear the load.

[0052] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A combined material frame for a pit furnace, characterized in that, include: A ring-shaped material frame structure with no less than two layers is vertically stacked. The ring-shaped material frame structure includes several fan-shaped material frame components (10) arranged in a ring array. The fan-shaped material frame component (10) includes a fan-shaped hollow tray (11), two fixing rods (12) and two fixing rods (13). The upper surface of the fan-shaped hollow tray (11) is provided with a wavy outer arc plate (14) near the outer arc edge and a wavy inner arc plate (15) near the inner arc edge. The upper surface of the fan-shaped hollow tray (11) is provided with wavy side arc plates (16) near both sides. The two ends of the wave-shaped outer arc plate (14) are respectively connected to the corresponding wave-shaped side arc plate (16) through a fixing rod (12). The two ends of the wave-shaped inner arc plate (15) are respectively connected to the corresponding wave-shaped side arc plate (16) through a fixing rod (2) (13). The fixing rod (12) and the fixing rod (12) are detachably connected to the fan-shaped hollow tray (11). The wave-shaped outer arc plate (14), the wave-shaped inner arc plate (15) and the wave-shaped side arc plate (16) are all hollow structure designs and have the same height.

2. The combined material frame for the pit furnace according to claim 1, characterized in that, The wave-shaped outer arc plate (14) includes an outer arc frame (141) and a wave-shaped plate (142) connected to its inner wall. The wave-shaped plate (142) is provided with a plurality of hollow holes (143) at intervals.

3. The combined material frame for the pit furnace according to claim 1, characterized in that, The wave-shaped inner arc plate (15) includes an inner arc frame (151) and a wave-shaped plate (152) connected to its inner wall. The wave-shaped plate (152) is provided with a plurality of hollow holes (153) at intervals.

4. The combined material frame for the pit furnace according to claim 1, characterized in that, The wave-shaped side arc plate (16) includes a rectangular frame (161) and a wave-shaped plate (162) connected to its inner wall. The wave-shaped plate (162) is provided with a plurality of hollow holes (163) at intervals.

5. The combined material frame for the pit furnace according to claim 1, characterized in that, The fan-shaped hollow tray (11) has hexagonal countersunk holes (2) at its four corners. The fixing rod (12) includes a bolt body (121), a fixing tube (122) and at least two fixing tubes (123) are fitted on the bolt body (121). A connecting plate (124) is connected between the outer circle of the fixing tube (122) and the wavy outer arc plate (14). A connecting plate (125) is connected between the outer circle of the fixing tube (123) and the wavy side arc plate (16). The bolt body (121) passes through the hexagonal countersunk hole (2) and is screwed to the upper end with a locking nut (126). The second fixing member (13) includes a bolt body (131), on which a fixing tube (132) and at least two fixing tubes (133) are fitted. The outer circle of the fixing tube (132) is connected to the wave-shaped inner arc plate (15) by a connecting plate (134). The outer circle of the fixing tube (133) is connected to the wave-shaped side arc plate (16) by a connecting plate (135). The bolt body (131) passes through a hexagonal countersunk hole (2) and is screwed to the upper end with a locking nut (136).

6. The combined material frame for the pit furnace according to claim 1, characterized in that, The fan-shaped hollow tray (11) is provided with several threaded connection holes (3) spaced apart. A support column (4) is spirally connected in the threaded connection hole (3). The top of the support column (4) is flush with the top of the wave-shaped outer arc plate (14).

7. The combined material frame for the pit furnace according to claim 1, characterized in that, A snap-fit ​​assembly (50) is provided between adjacent sector frame assemblies (10) in the vertical direction, which is suitable for preventing the sector frame assemblies (10) from sliding horizontally; The snap-fit ​​assembly (50) includes at least two snap-fit ​​pieces (51) spaced apart on the outer arc edge of the fan-shaped material frame assembly (10) and at least two snap-fit ​​pieces (52) spaced apart on both sides of the fan-shaped material frame assembly (10). The first snap-fit ​​component (51) includes a first slot (511) disposed on the outer arc surface of the fan-shaped hollow tray (11) and a first U-shaped plate (512) adapted to the first slot (511), the first U-shaped plate (512) being connected to the top of the wave-shaped outer arc plate (14). The second snap-fit ​​component (52) includes a second slot (521) disposed on the side of the fan-shaped hollow tray (11) and a second U-shaped plate (522) adapted to the second slot (521), the second U-shaped plate (522) being connected to the top of the wave-shaped side arc plate (16).

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