High-temperature box-type furnace

Abstract

The high-temperature box-type furnace comprises a furnace box, a hearth is fixedly connected to the interior of the furnace box, one side of the hearth is of an opening structure, a workpiece frame structure is arranged in the hearth and comprises a bottom table, the bottom table is fixedly connected to the inner bottom face of the hearth, and the top face of the bottom table is rotationally connected with a rotating plate in a sleeving mode; the center of the top face of the rotating plate is vertically and fixedly connected with a stand column, four vertical bins are evenly arranged on the top face of the rotating plate and located on the peripheral side of the stand column, and four sliding openings are formed in the positions, corresponding to the four vertical bins, of the rotating plate. When the heat treatment device is used, workpieces are placed on the material disc, and when heat treatment is carried out, the material disc can rotate along with the rotating plate, meanwhile, the material disc can rotate automatically, and the vertical bin can do reciprocating vertical motion, so that the position state of the workpieces can be continuously changed in the whole heat treatment process, the shielding positions among the workpieces can also be continuously changed, the material disc is uniformly heated, and the heat treatment efficiency is improved. The heat treatment on the workpiece is more uniform, and the heat treatment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature box furnaces, and specifically relates to a high-temperature box furnace. Background Art

[0002] The high-temperature box furnace, also known as a muffle furnace, is easy to operate and maintain. It is a general heating device widely used in the industrial field. Its core function is to achieve material processing and experimental analysis through a high-temperature environment. For example, the Chinese utility model application with the publication number CN216404468U discloses an anti-oxidation high-temperature box furnace for heat treatment, which discloses including a furnace cavity, and an inner lining plate is arranged in the furnace cavity. The inner lining plate is detachably fixed in the furnace cavity through a fixing mechanism. However, the current high-temperature box furnace has the following defects: When the current high-temperature box furnace performs high-temperature treatment on workpieces in the industrial field, a workpiece rack needs to be set in the furnace to place the workpieces, so as to facilitate the simultaneous treatment of multiple workpieces and improve efficiency. The current workpiece rack is fixed. After placing the workpieces, it will cause the situation of mutual shielding between the workpieces. The shielding position is slowly heated, resulting in uneven overall heat treatment of the workpieces and affecting the heat treatment efficiency.

[0003] Therefore, we propose a high-temperature box furnace to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature box furnace to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A high-temperature box furnace includes a furnace box. A furnace chamber is fixedly connected inside the furnace box. One side of the furnace chamber is an open structure. A workpiece rack structure is arranged inside the furnace chamber. The workpiece rack structure includes a bottom platform, the bottom platform is fixedly connected to the inner bottom surface of the furnace chamber, a rotating plate is rotatably sleeved on the top surface of the bottom platform, a vertical column is vertically fixedly connected to the center of the top surface of the rotating plate, four vertical bins are uniformly arranged on the top surface of the rotating plate around the column, four sliding openings are opened on the rotating plate corresponding to the positions of the four vertical bins, the bottom ends of the vertical bins are vertically slidably sleeved in the sliding openings, a plurality of annular bodies are uniformly fixedly connected to the side of the vertical bin away from the column, a material tray is rotatably sleeved inside each annular body, a plurality of through grooves are opened on the column near the positions of the four vertical bins, four sliding plates are uniformly fixedly connected to the side of the vertical bin near the column, each sliding plate is vertically slidably connected to the through groove, a plurality of guide rods are vertically fixedly connected in the through groove, a plurality of guide holes are vertically opened on the sliding plate, and the guide holes are slidably sleeved on the guide rods.

[0006] Preferably, a ring groove is formed inside the ring body, a first external gear ring is fixedly sleeved on the circumferential side of the material tray, the first external gear ring is slidably connected to the ring groove, a side port is formed in the side wall of the ring body close to the vertical bin, a vertical shaft is vertically rotatably connected inside the vertical bin, a plurality of first gears are fixedly sleeved on the vertical shaft at the same height position of a plurality of ring bodies, and the side wall of the first gear is located inside the side port and meshed with the first external gear ring.

[0007] Preferably, a top cavity is formed in the center of the top surface of the bottom platform, an internal gear ring is fixedly connected to the edge of the bottom surface of the top cavity, a rotating ring is rotatably connected to the bottom surface of the top cavity, four second gears are rotatably connected at positions directly below the four vertical bins on the rotating ring, and the four second gears are meshed with the internal gear ring.

[0008] Preferably, a bushing is rotatably sleeved at the bottom end of each vertical bin, a spline groove is formed inside the bottom end of the bushing, the bottom end of the vertical shaft is fixedly connected to the top end of the spline groove, a spline shaft is fixedly connected to the top end of the rotating shaft of each second gear, and the spline shaft is slidably sleeved in the spline groove.

[0009] Preferably, the bottom end of a vertical rod is vertically and fixedly connected to the center of the bottom surface of the top cavity, an inner cavity is formed inside the vertical column, the bottom end of the inner cavity is of an open structure, the vertical rod penetrates through the middle position of the rotating plate, the vertical rod is rotatably connected to the rotating plate, the upper part of the vertical rod is located inside the inner cavity, four reciprocating lead screws are uniformly and fixedly sleeved at the position of the vertical rod inside the inner cavity, a threaded sleeve is fixedly connected to the end of one of the sliding plates on each vertical bin, the threaded sleeve is threadedly connected to the reciprocating lead screw, and limiting plates are fixedly connected to the top end and the bottom end of the four reciprocating lead screws on the vertical rod.

[0010] Preferably, a second external gear ring is fixedly sleeved on the circumferential side of the rotating plate, a third gear is rotatably connected inside the bottom platform, the third gear is meshed with the second external gear ring, a heat insulation layer is fixedly connected to the circumferential side of the furnace chamber inside the furnace box, a heat insulation bushing is fixedly sleeved on the bottom surfaces of the furnace box, the furnace chamber and the heat insulation layer, and a driving shaft is vertically and rotatably sleeved inside the heat insulation bushing, and the top end of the driving shaft is located inside the bottom platform and fixedly connected to the center of the third gear.

[0011] Preferably, the bottom surface of the furnace box is fixedly connected to a base, a first servo reduction motor is fixedly connected to the position directly below the heat insulation bushing inside the base, the rotating shaft end of the first servo reduction motor is fixedly connected to the bottom end of the driving shaft, a controller is fixedly connected to the side wall of the furnace box, a plurality of heating elements are fixedly connected to the inner side wall of the furnace chamber, and a high-temperature furnace camera is fixedly connected to the inner top surface of the furnace chamber.

[0012] Preferably, a sealing door structure is provided on one side of the furnace box at the opening of the furnace chamber. The sealing door structure includes a cover plate and a hinge seat. The hinge seat is fixedly connected to the top surface of the furnace box. The hinge seat is rotatably connected to a rotating block. An end plate is provided on the side wall of the rotating block. The end of the end plate is fixedly connected to the end of the cover plate. A sealing frame groove is formed on the side of the cover plate close to the furnace box. A sealing insertion frame is fixedly connected to the side wall of the furnace box. A plurality of sliding holes are formed on the side wall of the rotating block. Each sliding hole is slidably sleeved with a sliding column. The sliding column is fixedly connected to the side wall of the end plate. A cylinder seat is fixedly connected to the center of the side wall of the rotating block. A hydraulic cylinder is fixedly connected to the cylinder seat. The output end of the hydraulic cylinder is fixedly connected to the side wall of the end plate. A second servo reduction motor is fixedly connected to the top surface of the furnace box at the position of the end of the hinge seat. The rotating shaft end of the second servo reduction motor is fixedly connected to the rotating shaft of the rotating block.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: When the present invention is used, the workpiece is placed on the tray. During heat treatment, the tray will rotate with the rotating plate, and at the same time, the tray will also rotate itself, and the vertical bin will also reciprocate vertically. Because the starting heights of each vertical bin are different, during the reciprocating lifting and lowering, the shielding positions between adjacent vertical bins will continuously change. In this way, the position states of the workpieces will continuously change during the entire heat treatment process, and the shielding positions between multiple workpieces will also continuously change, making the tray evenly heated and the heat treatment of the workpieces more uniform, improving the efficiency of heat treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Structural schematic diagram of the main body in the first and second embodiments of the present invention; Figure 2 Sectional structural schematic diagram of the furnace box in the first and second embodiments of the present invention; Figure 3 Sectional structural schematic diagram of the workpiece rack structure in the first and second embodiments of the present invention; Figure 4 Sectional structural schematic diagram of the base and the column in the first and second embodiments of the present invention; Figure 5 Sectional structural schematic diagram of the column in the first and second embodiments of the present invention; Figure 6 For the present invention Figure 4 Magnified structural schematic diagram of the structure at A in the present invention; Figure 7 For the present invention Figure 5 Magnified structural schematic diagram of the structure at B in the present invention; [[ID=�5]] Figure 8 Structural schematic diagram of the sealing door structure in the second embodiment of the present invention; Figure 9 Structural schematic diagram of the sealing door structure after being closed in the second embodiment of the present invention.

[0015] In the figure: 1, furnace box; 2, workpiece rack structure; 3, sealing door structure; 11, furnace chamber; 12, heat preservation layer; 13, high-temperature furnace camera; 14, heating element; 15, base; 16, controller; 17, first servo reduction motor; 18, heat insulation bushing; 19, drive shaft; 110, sealing insertion frame; 21, base table; 22, rotating plate; 23, column; 24, vertical bin; 25, sliding opening; 26, ring body; 27, tray; 28, vertical shaft; 29, first gear; 210, ring groove; 211, first external tooth ring; 212, side opening; 213, bushing; 214, spline groove; 215, rotating ring; 216, internal tooth ring; 217, second gear; 218, spline shaft; 219, inner cavity; 220, sliding plate; 221, through groove; 222, vertical rod; 223, reciprocating lead screw; 224, threaded sleeve; 225, limiting plate; 226, top cavity; 227, second external tooth ring; 228, third gear; 229, guide rod; 230, guide hole; 31, cover plate; 32, sealing frame groove; 33, hinge seat; 34, rotating block; 35, sliding hole; 36, sliding column; 37, end plate; 38, cylinder seat; 39, hydraulic cylinder; 310, second servo reduction motor. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment 1: Please refer to Figures 1-5, the present invention provides a technical solution: a high-temperature box furnace, including a furnace box 1, a hearth 11 is fixedly connected inside the furnace box 1, one side of the hearth 11 is an open structure, a workpiece rack structure 2 is arranged inside the hearth 11, the workpiece rack structure 2 includes a bottom platform 21, the bottom platform 21 is fixedly connected to the inner bottom surface of the hearth 11, a rotating plate 22 is rotatably sleeved on the top surface of the bottom platform 21, a vertical column 23 is vertically fixedly connected to the center of the top surface of the rotating plate 22, four vertical bins 24 are uniformly arranged on the top surface of the rotating plate 22 at positions around the column 23, four sliding openings 25 are opened on the rotating plate 22 corresponding to the positions of the four vertical bins 24, the bottom end of the vertical bin 24 is vertically slidably sleeved in the sliding opening 25, a plurality of annular bodies 26 are uniformly fixedly connected to the side of the vertical bin 24 away from the column 23, a material tray 27 is rotatably sleeved inside each annular body 26, a plurality of through grooves 221 are opened on the column 23 near the four vertical bins 24, four sliding plates 220 are uniformly fixedly connected to the side of the vertical bin 24 near the column 23, each sliding plate 220 is vertically slidably connected to the through groove 221, a plurality of guide rods 229 are vertically fixedly connected in the through groove 221, a plurality of guide holes 230 are vertically opened on the sliding plate 220, the guide holes 230 are slidably sleeved on the guide rods 229, and the cooperation of the through groove 221 and the guide holes 230 plays a guiding role to make it move more stably in the vertical direction.

[0018] Embodiment 2: Please refer to Figures 1-9 , which is the second embodiment of the present invention. Based on the previous embodiment, an annular groove 210 is opened inside the annular body 26, a first external gear ring 211 is fixedly sleeved on the circumferential side of the material tray 27, the first external gear ring 211 is slidably connected to the annular groove 210, a side opening 212 is opened on the side wall of the annular body 26 close to the vertical bin 24, a vertical shaft 28 is vertically rotatably connected inside the vertical bin 24, a plurality of first gears 29 are fixedly sleeved on the vertical shaft 28 at the same height position of the plurality of annular bodies 26, and the side wall of the first gear 29 is located inside the side opening 212 and meshes with the first external gear ring 211. The vertical shaft 28 drives the first gear 29 to rotate, and the material tray 27 can be driven to rotate by its meshing with the first external gear ring 211.

[0019] A top cavity 226 is opened at the center of the top surface of the bottom platform 21, an internal gear ring 216 is fixedly connected to the edge of the bottom surface of the top cavity 226, a rotating ring 215 is rotatably connected to the bottom surface of the top cavity 226, four second gears 217 are rotatably connected to the positions directly below the four vertical bins 24 on the rotating ring 215, and the four second gears 217 mesh with the internal gear ring 216. When the four second gears 217 revolve, relative movement will occur with the internal gear ring, and thus the second gears will rotate.

[0020] A sleeve 213 is rotatably sleeved at the bottom end of each vertical bin 24, a spline groove 214 is opened inside the bottom end of the sleeve 213, the bottom end of the vertical shaft 28 is fixedly connected to the top end of the spline groove 214, a spline shaft 218 is fixedly connected to the top end of the rotating shaft of each second gear 217, and the spline shaft 218 is slidably sleeved in the spline groove 214. The sleeve 213 is used to drive the vertical shaft 28 to rotate.

[0021] The bottom center of the top cavity 226 is vertically and fixedly connected to the bottom end of the vertical rod 222. An inner cavity 219 is provided inside the column 23. The bottom end of the inner cavity 219 is of an open structure. The vertical rod 222 penetrates through the middle position of the rotating plate 22. The vertical rod 222 is rotatably connected to the rotating plate 22. The upper part of the vertical rod 222 is located inside the inner cavity 219. Four reciprocating lead screws 223 are evenly and fixedly sleeved on the vertical rod 222 at the inner position of the inner cavity 219. One end of a sliding plate 220 on each storage bin 24 is fixedly connected to a threaded sleeve 224. The threaded sleeve 224 is threadedly connected to the reciprocating lead screw 223. Limiting plates 225 are fixedly connected to the vertical rod 222 at the top and bottom positions of the four reciprocating lead screws 223. When the storage bin 24 rotates following the rotating plate 22, relative rotation occurs between the threaded sleeve 224 and the reciprocating lead screw 223. Thus, under the action of the reciprocating lead screw 223, the threaded sleeve 224 will move vertically in a reciprocating manner, driving the storage bin 24 to move vertically in a reciprocating manner, thereby continuously changing the height position of the workpiece in the tray 27.

[0022] A second external toothed ring 227 is fixedly sleeved on the circumferential side of the rotating plate 22. A third gear 228 is rotatably connected inside the bottom platform 21. The third gear 228 is meshed and connected to the second external toothed ring 227. A heat insulation layer 12 is fixedly connected to the furnace box 1 at the circumferential side position around the furnace chamber 11. The bottom surface of the furnace box 1 is fixedly sleeved with a heat insulation bushing 18. The driving shaft 19 is vertically and rotatably sleeved inside the heat insulation bushing 18 (the heat insulation bushing is used to protect the driving shaft and is usually made of materials such as ceramics). The top end of the driving shaft 19 is located inside the bottom platform 21 and is fixedly connected to the center of the third gear 228.

[0023] The bottom surface of the furnace box 1 is fixedly connected to the base 15. A first servo reduction motor 17 is fixedly connected to the inner side of the base 15 at the position directly below the heat insulation bushing 18. The rotating shaft end of the first servo reduction motor 17 is fixedly connected to the bottom end of the driving shaft 19. A controller 16 is fixedly connected to the side wall of the furnace box 1. A plurality of heating elements 14 are fixedly connected to the inner side wall of the furnace chamber 11. A high-temperature furnace camera 13 is fixedly connected to the inner top surface of the furnace chamber 11. By driving the rotating plate 22 to rotate through the first servo reduction motor 17, the high-temperature furnace camera 13 can observe the macroscopic and microscopic structures of the workpiece in situ, and the heating elements 14 can achieve temperature rise. Heat treatment processes can be customized online to control the temperature rise and fall operations.

[0024] A sealing door structure 3 is provided on one side of the opening of the furnace box 1 located at the opening of the furnace chamber 11. The sealing door structure 3 includes a cover plate 31 and a hinge seat 33. The hinge seat 33 is fixedly connected to the top surface of the furnace box 1. The hinge seat 33 is rotatably connected to a rotating block 34. An end plate 37 is provided on the side wall of the rotating block 34. The end of the end plate 37 is fixedly connected to the end of the cover plate 31. A sealing frame groove 32 is formed on the side of the cover plate 31 close to the furnace box 1. A sealing insertion frame 110 is fixedly connected to the side wall of the furnace box 1. A plurality of sliding holes 35 are formed on the side wall of the rotating block 34. Each sliding hole 35 is slidably sleeved with a sliding pillar 36. The sliding pillar 36 is fixedly connected to the side wall of the end plate 37. A cylinder seat 38 is fixedly connected to the center of the side wall of the rotating block 34. A hydraulic cylinder 39 is fixedly connected to the cylinder seat 38. The output end of the hydraulic cylinder 39 is fixedly connected to the side wall of the end plate 37. A second servo reduction motor 310 is fixedly connected to the top surface of the furnace box 1 at the position of the end of the hinge seat 33. The rotating shaft end of the second servo reduction motor 310 is fixedly connected to the rotating shaft of the rotating block 34. An automated closing structure is adopted, which is convenient to open and close, so that it is convenient for the robot to sample and place samples regularly. The cover plate 31 is driven to rotate by the second servo reduction motor 310, and the cover plate 31 is driven to move horizontally by the hydraulic cylinder 39, so that the cover plate 31 covers the surface of the furnace box 1. When it needs to be opened, first drive the cover plate 31 to move horizontally away from the furnace box 1 by the hydraulic cylinder 39, and then drive the cover plate 31 to rotate 90° by the second servo reduction motor 310 to open the cover plate 31.

[0025] When the present invention is in use, the robot places the workpieces on the trays 27 at various positions. After closing the cover plate 31, heat treatment is carried out. During the heat treatment, the tray 27 will rotate along with the rotating plate 22, and at the same time, the tray 27 will also rotate itself, and the vertical bin 24 will also move vertically back and forth. In this way, the position state of the workpieces will constantly change during the whole heat treatment process, and the occlusion positions between multiple workpieces will also constantly change, making the tray 27 heat more evenly, the heat treatment is uniform, and the efficiency of the heat treatment is improved.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature box furnace, comprising a furnace box (1), characterized in that: A hearth (11) is fixedly connected inside the furnace box (1). One side of the hearth (11) is an open structure. A workpiece rack structure (2) is arranged inside the hearth (11). The workpiece rack structure (2) includes a bottom platform (21). The bottom platform (21) is fixedly connected to the inner bottom surface of the hearth (11). A rotating plate (22) is rotatably sleeved on the top surface of the bottom platform (21). A vertical column (23) is perpendicularly fixedly connected to the center of the top surface of the rotating plate (22). Four vertical bins (24) are evenly arranged on the top surface of the rotating plate (22) at the circumferential side position of the column (23). Four sliding openings (25) are opened on the rotating plate (22) corresponding to the positions of the four vertical bins (24). The bottom ends of the vertical bins (24) are vertically slidably sleeved in the sliding openings (25). A plurality of annular bodies (26) are evenly fixedly connected to the side of the vertical bin (24) away from the column (23). A material tray (27) is rotatably sleeved inside each annular body (26). A plurality of through grooves (221) are opened on the column (23) near the positions of the four vertical bins (24). Four sliding plates (220) are evenly fixedly connected to the side of the vertical bin (24) near the column (23). Each sliding plate (220) is vertically slidably connected to the through groove (221). A plurality of guide rods (229) are vertically fixedly connected in the through groove (221). A plurality of guide holes (230) are vertically opened on the sliding plate (220). The guide holes (230) are slidably sleeved on the guide rods (229).

2. The high-temperature box furnace according to claim 1, wherein: An annular groove (210) is opened inside the annular body (26). A first external gear ring (211) is fixedly sleeved on the circumferential side of the material tray (27). The first external gear ring (211) is slidably connected to the annular groove (210). A side opening (212) is opened on the side wall of the annular body (26) close to the vertical bin (24). A vertical shaft (28) is vertically rotatably connected inside the vertical bin (24). A plurality of first gears (29) are fixedly sleeved on the vertical shaft (28) at the same height position of the plurality of annular bodies (26). The side wall of the first gear (29) is located inside the side opening (212) and meshed with the first external gear ring (211).

3. The high-temperature box furnace according to claim 2, wherein: A top cavity (226) is opened at the center of the top surface of the bottom platform (21). An internal gear ring (216) is fixedly connected to the edge of the bottom surface of the top cavity (226). A rotating ring (215) is rotatably connected to the bottom surface of the top cavity (226). Four second gears (217) are rotatably connected to the positions directly below the four vertical bins (24) on the rotating ring (215). The four second gears (217) are meshed with the internal gear ring (216).

4. The high-temperature box furnace according to claim 3, characterized in that: A bushing (213) is rotatably sleeved at the bottom end of each vertical bin (24). A spline groove (214) is opened inside the bottom end of the bushing (213). The bottom end of the vertical shaft (28) is fixedly connected to the top end of the spline groove (214). A spline shaft (218) is fixedly connected to the top end of the rotating shaft of each second gear (217). The spline shaft (218) is slidably sleeved in the spline groove (214).

5. The high-temperature box furnace according to claim 4, characterized in that: The bottom center of the top cavity (226) is vertically and fixedly connected to the bottom end of the vertical rod (222). An inner cavity (219) is formed inside the column (23). The bottom end of the inner cavity (219) is of an open structure. The vertical rod (222) penetrates through the middle position of the rotating plate (22). The vertical rod (222) is rotatably connected to the rotating plate (22). The upper part of the vertical rod (222) is located inside the inner cavity (219). Four reciprocating lead screws (223) are uniformly and fixedly sleeved on the vertical rod (222) at the position inside the inner cavity (219). One end of one of the sliding plates (220) on each bin (24) is fixedly connected to a threaded sleeve (224). The threaded sleeve (224) is threadedly connected to the reciprocating lead screw (223). Limiting plates (225) are fixedly connected to the vertical rod (222) at the top and bottom positions of the four reciprocating lead screws (223).

6. The high-temperature box furnace according to claim 5, wherein: A second external toothed ring (227) is fixedly sleeved on the periphery of the rotating plate (22). A third gear (228) is rotatably connected inside the bottom platform (21). The third gear (228) is meshed with the second external toothed ring (227). A heat insulation layer (12) is fixedly connected to the periphery of the furnace chamber (11) inside the furnace box (1). The bottom surface of the furnace box (1) is fixedly sleeved with a heat insulation bushing (18). The driving shaft (19) is vertically and rotatably sleeved inside the heat insulation bushing (18). The top end of the driving shaft (19) is located inside the bottom platform (21) and is fixedly connected to the center of the third gear (228).

7. The high-temperature box furnace according to claim 1, characterized in that: The bottom surface of the furnace box (1) is fixedly connected to a base (15). A first servo reduction motor (17) is fixedly connected to the inner side of the base (15) at a position directly below the heat insulation bushing (18). The rotating shaft end of the first servo reduction motor (17) is fixedly connected to the bottom end of the driving shaft (19). A controller (16) is fixedly connected to the side wall of the furnace box (1). A plurality of heating elements (14) are fixedly connected to the inner side wall of the furnace chamber (11). A high-temperature furnace camera (13) is fixedly connected to the inner top surface of the furnace chamber (11).

8. A high-temperature box furnace according to claim 1, characterized in that: A sealing door structure (3) is arranged on one side of the furnace box (1) at the opening of the furnace chamber (11). The sealing door structure (3) includes a cover plate (31) and a hinge seat (33). The hinge seat (33) is fixedly connected to the top surface of the furnace box (1). The hinge seat (33) is rotatably connected to a rotating block (34). An end plate (37) is arranged on the side wall of the rotating block (34). The end of the end plate (37) is fixedly connected to the end of the cover plate (31). A sealing frame groove (32) is formed on the side of the cover plate (31) close to the furnace box (1). A sealing insertion frame (110) is fixedly connected to the side wall of the furnace box (1). A plurality of sliding holes (35) are formed on the side wall of the rotating block (34). Each sliding hole (35) is slidably sleeved with a sliding column (36). The sliding column (36) is fixedly connected to the side wall of the end plate (37). A cylinder seat (38) is fixedly connected to the center of the side wall of the rotating block (34). A hydraulic cylinder (39) is fixedly connected to the cylinder seat (38). The output end of the hydraulic cylinder (39) is fixedly connected to the side wall of the end plate (37). A second servo reduction motor (310) is fixedly connected to the top surface of the furnace box (1) at the end position of the hinge seat (33). The rotating shaft end of the second servo reduction motor (310) is fixedly connected to the rotating shaft of the rotating block (34).

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