A type of bell-shaped furnace

Abstract

The application relates to a bell-type furnace, belonging to the technical field of annealing furnaces, which comprises a furnace table, an inner cover and a heating cover arranged on the furnace table, the heating cover covers the inner cover, two supporting tables are arranged in the furnace table, each workpiece is placed on one supporting table, the inner cover covers the workpiece, and rotating devices for driving the two supporting tables to rotate simultaneously are arranged in the furnace table. The application has the effects of realizing uniform heating of workpieces in a heating process and reducing the deformation of the workpieces in the heating process.

Description

Technical Field

[0001] This application relates to the field of annealing furnace technology, and in particular to a bell-type furnace. Background Technology

[0002] A bell-type furnace is a heat treatment furnace where the furnace body is a bell, or the furnace bottom is stationary while the bell is movable, or vice versa. It is used for batch heat treatment of workpieces. It has circular and rectangular structures. The bell shell is welded from steel plates and shaped steel, with an internal furnace lining. The heating devices (electric heating elements or gas burners) are arranged on the walls surrounding the furnace chamber. Two guide columns are provided on the furnace platform to facilitate bell shell installation. Different atmospheres can be used for protection depending on the heat treatment process requirements. A typical bell-type furnace consists of a heating bell, a cooling bell, a furnace platform, an inner bell, and corresponding cooling and evacuation systems. To improve product quality and shorten the annealing cycle, the number of inner bells is the same as the number of furnace platforms, the number of heating bells is generally half the number of furnace platforms plus one, and the number of cooling bells is about half the number of furnace platforms. Bell-type furnaces have a large loading capacity and require high temperature uniformity, so forced convection fans are installed to circulate the furnace gas.

[0003] Regarding the aforementioned technologies, workpieces can generally only be stacked in a bell-type furnace for heating, and cannot be arranged in a specific order. Arranging workpieces in a specific order will result in uneven heating, leading to defective workpieces. However, stacking workpieces will cause the lower workpiece to lose rigidity during heating, and the upper workpiece will exert pressure on the lower workpiece, causing the lower workpiece to deform, which will make the lower workpiece more prone to defective processing. Summary of the Invention

[0004] In order to ensure uniform heating of the workpiece during the heating process and reduce the deformation of the workpiece during heating, this application provides a bell-type furnace.

[0005] The bell-type furnace provided in this application adopts the following technical solution:

[0006] A bell-type furnace includes a furnace platform, an inner cover and a heating cover provided on the furnace platform, the heating cover covering the inner cover, two support platforms provided inside the furnace platform, each workpiece is placed on one of the support platforms, the inner cover covers the workpiece, and a rotating device is provided inside the furnace platform for driving the two support platforms to rotate simultaneously.

[0007] By adopting the above technical solution, two workpieces are placed on a support platform, and then the rotating device drives the two support platforms to rotate simultaneously, thereby realizing the rotation of the workpieces. The rotation of the workpieces ensures that the workpieces are heated evenly during the heating process, replacing the traditional method of heating by stacking. This avoids the upper workpiece applying pressure to the lower workpiece, which could cause the lower workpiece to deform and thus easily lead to unqualified processing of the lower workpiece, reducing the possibility of workpiece deformation during the heating process.

[0008] Optionally, the rotating device includes a first rotating shaft rotatably connected inside the furnace platform, a second rotating shaft rotatably connected inside the furnace platform, one support platform connected to the first rotating shaft, and another support platform connected to the second rotating shaft. A driving turntable is provided on the first rotating shaft, and a driven turntable is provided on the second rotating shaft. The driving turntable and the driven turntable are jointly provided with a first synchronous belt. A driving component for driving the first rotating shaft to rotate is provided inside the furnace platform.

[0009] By adopting the above technical solution, the driving component drives the first rotating shaft to rotate, the first rotating shaft drives the active rotating disk to rotate, the active rotating disk drives the first synchronous belt to move, the first synchronous belt drives the driven rotating disk to rotate, and the driven rotating disk drives the second rotating shaft to rotate, thereby realizing that the support platform of the first rotating shaft and the support platform of the second rotating shaft rotate simultaneously.

[0010] Optionally, the driving component includes a first connecting block, which is disposed on the first rotating shaft and is inclined. A second connecting block is hinged to the first connecting block, and the second connecting block is connected to a first connecting rod. The first connecting rod is hinged to a second connecting rod. A rotating shaft is disposed inside the furnace platform, and a first bushing rotates on the rotating shaft. The second connecting rod is connected to the first bushing, and a driving rod is connected to the first bushing. The driving rod extends out of the furnace platform and is slidably connected to a cylinder. The axes of the hinge shafts of the first and second connecting blocks, the axis of the first rotating shaft, and the axis of the hinge shafts of the first and second connecting rods intersect at a point on the axis of the first rotating shaft.

[0011] By adopting the above technical solution, the cylinder drives the drive rod to reciprocate up and down, the drive rod drives the first bushing to rotate, the first bushing drives the second connecting rod to swing, the second connecting rod drives the first connecting rod to move, and the swing of the first connecting rod simultaneously causes the second connecting block and the first connecting block to move, thereby realizing that the first connecting block drives the first rotating shaft to rotate. Furthermore, by adjusting the stroke length of the cylinder's reciprocating motion, the first rotating shaft can perform full rotation and half rotation motions to meet different processing requirements of the workpiece.

[0012] Optionally, a rotating sleeve is rotatably mounted on the first rotating shaft, a first turntable is mounted on the rotating sleeve, a second turntable is mounted on the second rotating shaft, the first turntable and the second turntable are jointly provided with a second synchronous belt, one support platform is connected to the rotating sleeve, and the other support platform is connected to the second rotating shaft.

[0013] By adopting the above technical solution, the first rotating shaft drives the second rotating shaft to rotate via the first synchronous belt. The rotation of the second rotating shaft drives the second turntable to rotate. The second turntable drives the second synchronous belt to move, and the second synchronous belt drives the first turntable to rotate. The first turntable and the second turntable have different design dimensions, which makes the first turntable and the second turntable rotate at different speeds. Thus, according to different processing needs, two workpieces can be processed at different speeds in one heating process to meet different processing requirements of the workpieces.

[0014] Optionally, a second bushing is rotatably provided at the end of the rotating shaft away from the first bushing. A driven rod is provided on the second bushing. The driven rod is connected to a connecting rod. The connecting rod is connected to the drive rod of another furnace platform. Only one of the furnace platforms has a drive rod connected to the cylinder. A linkage component is provided inside the furnace platform to drive the driven rod to rotate when the drive rod rotates.

[0015] By adopting the above technical solution, the drive rod drives the first bushing to rotate, and the first bushing drives the second bushing to rotate through the linkage, thereby realizing that the first bushing drives the driven rod to move, the driven rod drives the connecting rod to move, and the connecting rod drives the drive rod of the adjacent furnace to rotate. Thus, in an annealing system with multiple furnaces heating at the same time, only one cylinder is needed to drive the support platform of all furnaces to rotate at the same time.

[0016] Optionally, the linkage includes a drive gear, which is mounted on the first bushing, and a driven gear is mounted on the second bushing. A first gear, a second gear, a third gear, and a fourth gear are rotatably mounted inside the furnace platform. The first gear meshes with the driven gear, the second gear is coaxial with the first gear, the fourth gear meshes with the driven gear, and the third gear is coaxial with the fourth gear.

[0017] By adopting the above technical solution, the first bushing drives the driving gear to rotate, the driving gear drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the third gear to rotate, and the third gear drives the fourth gear to rotate, thereby causing the fourth gear to drive the driven gear and the second bushing to rotate, thus realizing the driving rod driving the driven rod to swing.

[0018] Optionally, a touch-type counting sensor is installed inside the furnace platform, and a spring is installed inside the furnace platform. The spring is connected to a counting block, which is slidably connected to the furnace platform. The counting block corresponds to the touch-type counting sensor. A guide wheel is rotatably installed on the counting block, and a guide block is installed on the first rotating shaft. The guide block contacts the guide wheel. Every time the first rotating shaft rotates by a set angle, the guide block pushes the counting block to contact the touch-type counting sensor.

[0019] By adopting the above technical solution, the first rotating shaft rotates and drives the guide block to rotate. The guide block gradually pushes the guide wheel and the counting block to move closer to the touch-type counting sensor. Whenever the first rotating shaft rotates 90°, the guide block pushes the counting block to contact the touch-type counting sensor for counting. When the first rotating shaft continues to rotate 90°, the spring pushes the counting block to gradually reset, thereby recording the number of rotations during the workpiece heating process.

[0020] Optionally, the heating cover is provided with at least two hooks.

[0021] By adopting the above technical solution, the two hooks can lift the heating cover in a balanced manner.

[0022] Optionally, the upper part of the furnace platform is a solid structure, and the lower part of the furnace platform is a hollow structure. The ends of the rotating sleeve and the second rotating shaft away from the support platform are both located in the hollow structure of the lower part of the furnace platform. Two sealing rings are provided on the inner top wall of the hollow structure of the furnace platform. One sealing ring is tightly fitted on the second rotating shaft, and the other sealing ring is tightly fitted on the rotating sleeve.

[0023] By adopting the above technical solution, the sealing ring prevents the leakage of protective gas inside the inner cover during the heating process.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. Place two workpieces on a support platform, and then rotate the two support platforms simultaneously to achieve workpiece rotation. The rotation of the workpieces ensures that they are heated evenly during the heating process, replacing the traditional method of stacking them for heating. This avoids the upper workpiece applying pressure to the lower workpiece, which could cause deformation of the lower workpiece and make it prone to processing defects. This reduces the occurrence of workpiece deformation during the heating process.

[0026] 2. The cylinder drives the drive rod to reciprocate up and down. The drive rod drives the first bushing to rotate, the first bushing drives the second connecting rod to swing, and the second connecting rod drives the first connecting rod to move. The swinging of the first connecting rod simultaneously causes the second connecting block and the first connecting block to move, thereby enabling the first connecting block to drive the first rotating shaft to rotate. Furthermore, by adjusting the stroke length of the cylinder's reciprocating motion, the first rotating shaft can perform full rotation or half rotation to meet different processing requirements of the workpiece. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 2 This is a structural schematic diagram illustrating the position of the sealing ring in an embodiment of this application.

[0029] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0030] Figure 4 This is a schematic diagram illustrating the structure of the rotating device and the driving component in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram illustrating the structure of the driven gear in an embodiment of this application.

[0032] Figure 6 yes Figure 4 Enlarged schematic diagram of part B.

[0033] Explanation of reference numerals in the attached drawings: 1. Furnace platform; 11. Sealing ring; 12. Touch-type counting sensor; 13. Spring; 14. Counting block; 15. Guide wheel; 16. Guide block; 2. Inner cover; 3. Heating cover; 31. Hook; 4. Support platform; 5. Rotating device; 51. Rotating sleeve; 52. Second rotating shaft; 53. First turntable; 54. Second turntable; 55. Second synchronous belt; 56. First rotating shaft; 57. Driving turntable; 58. Driven turntable; 59. 9. First synchronous belt; 6. Drive component; 61. First connecting block; 62. Second connecting block; 63. First connecting rod; 64. Second connecting rod; 65. Rotating shaft; 66. First bushing; 67. Drive rod; 68. Second bushing; 69. Driven rod; 610. Linkage rod; 611. Cylinder; 7. Linkage component; 71. Drive gear; 72. Driven gear; 73. First gear; 74. Second gear; 75. Third gear; 76. Fourth gear. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0035] This application discloses a bell-type furnace.

[0036] like Figure 1 and Figure 2 The bell-type furnace includes a furnace platform 1 with an inverted T-shaped longitudinal section. An inner cover 2 is installed on the top of the furnace platform 1, supporting the inner cover 2. A heating cover 3 is placed on the stepped surface of the furnace platform 1. Two hooks 31 are welded to the top surface of the heating cover 3, each located on one side of the heating cover 3. Two support platforms 4 are rotatably connected to the furnace platform 1, located above the top surface of the furnace platform 1. A rotating device 5 is installed inside the furnace platform 1 to drive the two support platforms 4 to rotate simultaneously.

[0037] Two workpieces are placed on a support platform 4, and then the rotating device 5 drives the two support platforms 4 to rotate simultaneously, thereby realizing the rotation of the workpieces. The rotation of the workpieces ensures that the workpieces are heated evenly during the heating process, which replaces the traditional method of heating by stacking. This avoids the upper workpiece applying pressure to the lower workpiece, which would cause the lower workpiece to deform and thus easily lead to unqualified processing of the lower workpiece, reducing the possibility of workpiece deformation during the heating process.

[0038] like Figure 2 , Figure 3 and Figure 4 The rotating device 5 includes a rotating sleeve 51, which is rotatably connected inside the furnace platform 1. The rotating sleeve 51 is fixedly connected to a support platform 4. A second rotating shaft 52 is rotatably connected inside the furnace platform 1 and is fixedly connected to another support platform 4. The upper part of the furnace platform 1 is a solid structure, and the lower part is a hollow structure. The ends of the rotating sleeve 51 and the second rotating shaft 52 away from the support platform 4 are both located in the hollow part of the furnace platform 1. Two sealing rings 11 are provided on the inner top wall of the hollow structure of the furnace platform 1, and each of the rotating sleeve 51 and the second rotating shaft 52 passes through a sealing ring 11. The two sealing rings 11 are respectively fastened to the rotating sleeve 51 and the second rotating shaft 52. The sealing rings 11 prevent leakage of the protective gas inside the inner cover 2 during the heating process.

[0039] The rotating sleeve 51 is located at one end of the lower cavity of the furnace platform 1 and is coaxially fixed with a first turntable 53. The second rotating shaft 52 is located at one end of the lower cavity of the furnace platform 1 and is coaxially fixed with a second turntable 54. The first turntable 53 and the second turntable 54 are wound together and taut with a second synchronous belt 55.

[0040] A first rotating shaft 56 is rotatably connected inside the furnace platform 1. One end of the first rotating shaft 56 passes through the rotating sleeve 51. The first rotating shaft 56 is coaxially fixed with a driving turntable 57. The second rotating shaft 52 is coaxially fixed with a driven turntable 58. The driving turntable 57 and the driven turntable 58 are wound together and taut with a first synchronous belt 59. The end face of the first rotating shaft 56 extending into the rotating sleeve 51 is flush with the top surface of the rotating sleeve 51.

[0041] The furnace platform 1 is equipped with a driving component 6 for driving the first rotating shaft 56 to rotate. The driving component 6 includes a first connecting block 61. One end of the first connecting block 61 is sleeved and fixed on the first rotating shaft 56, and the other end of the first connecting block 61 is inclined downward. The first connecting block 61 is hinged to a second connecting block 62, and the second connecting block 62 is hinged to a first connecting rod 63. The first connecting rod 63 is an L-shaped rod, and the first connecting rod 63 is hinged to a second connecting rod 64, which is also an L-shaped rod. The axes of the hinge shafts of the first connecting block 61 and the second connecting block 62, the axis of the first rotating shaft 56, and the axes of the hinge shafts of the first connecting rod 63 and the second connecting rod 64 intersect at a point on the axis of the first rotating shaft 56. A rotating shaft 65 is fixed inside the furnace platform 1. A first bushing 66 is sleeved on one end of the rotating shaft 65. The second connecting rod 64 and the end away from the first connecting rod 63 are fixed to the first bushing 66. A drive rod 67 is fixedly connected to the first bushing 66. The drive rod 67 and the first connecting rod 63 are symmetrically arranged about the axis of the first bushing 66.

[0042] like Figure 1 and Figure 4 A second bushing 68 is fitted onto the end of the rotating shaft 65 furthest from the first bushing 66. A driven rod 69 is fixedly connected to the second bushing 68. A connecting rod 610 is connected to the end of the driven rod 69 furthest from the second bushing 68. The connecting rod 610 is connected to the drive rod 67 of the adjacent furnace platform 1. A cylinder 611 is slidably connected to the drive rod 67 of the rightmost furnace platform 1. The piston rod of the cylinder 611 is slidably connected to the drive rod 67. The cylinder 611 is fixed to the ground. A linkage 7 is provided inside the furnace platform 1 to cause the driven rod 69 to rotate when the drive rod 67 rotates.

[0043] like Figure 4 and Figure 5 The linkage 7 includes a drive gear 71, which is coaxially fixed on the first bushing 66. The driven gear 72 is coaxially fixed on the second bushing 68. The furnace platform 1 is rotatably connected to a first gear 73, a second gear 74, a third gear 75, and a fourth gear 76. The first gear 73 meshes with the driven gear 72, the second gear 74 is coaxially arranged with the first gear 73, the fourth gear 76 meshes with the driven gear 72, and the third gear 75 is coaxially arranged with the fourth gear 76.

[0044] Cylinder 611 drives drive rod 67 to swing up and down, drive rod 67 drives first bushing 66 to rotate, first bushing 66 drives second connecting rod 64 to swing, second connecting rod 64 drives first connecting rod 63 to move, first connecting rod 63 swings while causing second connecting block 62 and first connecting block 61 to move, causing first connecting block 61 to drive first rotating shaft 56 to rotate.

[0045] The first rotating shaft 56 drives the active rotating disk 57 to rotate, the active rotating disk 57 drives the first synchronous belt 59 to move, the first synchronous belt 59 drives the driven rotating disk 58 to rotate, the driven rotating disk 58 drives the second rotating shaft 52 to rotate, the second rotating shaft 52 drives the second rotating disk 54 to rotate, the second rotating disk 54 drives the second synchronous belt 55 to move, and the second synchronous belt 55 drives the first rotating disk 53 to rotate. The first rotating disk 53 and the second rotating disk 54 have different design dimensions, so that the first rotating disk 53 and the second rotating disk 54 rotate at different speeds. Therefore, according to different processing needs, two workpieces can be processed at different speeds in one heating process to meet different processing requirements of the workpieces.

[0046] Furthermore, the active turntable 57 and the driven turntable 58 are the same size. To achieve the same rotation speed for the two workpieces, it is only necessary to separate the support table 4 from the rotating sleeve 51 and connect it to the first rotating shaft 56.

[0047] Meanwhile, by adjusting the stroke length of the reciprocating motion of the cylinder 611, the first rotating shaft 56 can be made to rotate fully or partially, thereby enabling the support table 4 to rotate fully or partially to meet different processing requirements of the workpiece.

[0048] When cylinder 611 drives the drive rod 67 of the first furnace platform 1 on the right to rotate, the drive rod 67 drives the first bushing 66 to rotate, the first bushing 66 drives the drive gear 71 to rotate, the drive gear 71 drives the first gear 73 to rotate, the first gear 73 drives the second gear 74 to rotate, the second gear 74 drives the third gear 75 to rotate, the third gear 75 drives the fourth gear 76 to rotate, thereby causing the fourth gear 76 to drive the driven gear 72 and the second bushing 68 to rotate, thus realizing that the drive rod 67 drives the driven rod 69 to swing.

[0049] Driven rod 69 drives linkage rod 610 to move, and linkage rod 610 drives drive rod 67 of adjacent furnace platform 1 to rotate. Thus, in an annealing system with multiple furnace platforms 1 heating simultaneously, only one cylinder 611 is needed to drive the support platform 4 of all furnace platforms 1 to rotate simultaneously.

[0050] like Figure 4 and Figure 6 A touch-type counting sensor 12 is fixed to the inner wall of the cavity at the bottom of the furnace platform 1. A spring 13 is fixed to the inner wall of the furnace platform 1. A counting block 14 is connected to the spring 13. The counting block 14 is slidably connected to the furnace platform 1. One end face of the counting block 14 corresponds to the touch-type counting sensor 12. A guide wheel 15 is rotatably connected to the end of the counting block 14 away from the spring 13. A guide block 16 is coaxially fixed to the first rotating shaft 56. The guide block 16 is located between the active turntable 57 and the rotating sleeve 51. The guide block 16 is an elliptical block and has pointed ends at both ends of the long axis of the guide block 16.

[0051] The first rotating shaft 56 rotates and drives the guide block 16 to rotate. The guide block 16 gradually pushes the guide wheel 15 and the counting block 14 to move closer to the touch-type counting sensor 12. Whenever the first rotating shaft 56 rotates 90°, the guide block 16 pushes the counting block 14 to contact the touch-type counting sensor 12 for counting. When the first rotating shaft 56 continues to rotate 90°, the spring 13 pushes the counting block 14 to gradually reset, thereby recording the number of rotations during the workpiece heating process.

[0052] The implementation principle of this application embodiment is as follows: two workpieces are placed on a support platform 4 respectively, and then the rotating device 5 drives the two support platforms 4 to rotate simultaneously, thereby realizing the rotation of the workpieces. The rotation of the workpieces makes the workpieces heat evenly during the heating process, which replaces the traditional method of heating by stacking. This avoids the upper workpiece applying pressure to the lower workpiece, causing the lower workpiece to deform, which would easily lead to the lower workpiece being unqualified in processing, and reduces the possibility of workpiece deformation during the heating process.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bell-type furnace characterized by: The application relates to a furnace table (1) provided with an inner cover (2) and a heating cover (3), the heating cover (3) covers the inner cover (2), two supporting tables (4) are arranged in the furnace table (1), each workpiece is placed on one supporting table (4), the inner cover (2) covers the workpiece, and rotating devices (5) for driving the two supporting tables (4) to rotate simultaneously are arranged in the furnace table (1); the rotating devices (5) comprise a first rotating shaft (56) rotatably connected in the furnace table (1), a second rotating shaft (52) is also rotatably connected in the furnace table (1), one supporting table (4) is connected with the first rotating shaft (56), and the other supporting table (4) is connected with the second rotating shaft (52); a driving turntable (57) is arranged on the first rotating shaft (56); a driven turntable (58) is arranged on the second rotating shaft (52); the driving turntable (57) and the driven turntable (58) are jointly provided with a first synchronous belt (59); and a driving piece (6) for driving the first rotating shaft (56) to rotate is arranged in the furnace table (1); the driving piece (6) comprises a first connecting block (61) arranged on the first rotating shaft (56), the first connecting block (61) is arranged obliquely, the first connecting block (61) is hingedly connected with a second connecting block (62), the second connecting block (62) is connected with a first connecting rod (63), the first connecting rod (63) is hingedly connected with a second connecting rod (64), a rotating shaft (65) is arranged in the furnace table (1), a first shaft sleeve (66) is rotatably arranged on the rotating shaft (65), the second connecting rod (64) is connected with the first shaft sleeve (66), the first shaft sleeve (66) is connected with a driving rod (67), the driving rod (67) extends out of the furnace table (1), a pneumatic cylinder (611) is slidably connected with the driving rod (67), the axis of the hinge shaft of the first connecting block (61) and the second connecting block (62), the axis of the first rotating shaft (56) and the axis of the hinge shaft of the first connecting rod (63) and the second connecting rod (64) intersect at a point on the axis of the first rotating shaft (56); a rotating sleeve (51) is rotatably arranged on the first rotating shaft (56), a first turntable (53) is arranged on the rotating sleeve (51), a second turntable (54) is arranged on the second rotating shaft (52), and the first turntable (53) and the second turntable (54) are jointly provided with a second synchronous belt (55); one supporting table (4) is connected with the rotating sleeve (51), and the other supporting table (4) is connected with the second rotating shaft (52). The second shaft sleeve (68) is provided with a driven rod (69) on one end away from the first shaft sleeve (66), the driven rod (69) is connected with a connecting rod (610), the connecting rod (610) is connected with a driving rod (67) of another stove table (1), only one driving rod (67) of the stove table (1) is connected with the air cylinder (611), the stove table (1) is provided with a linkage (7) for driving the driving rod (67) to rotate and driving the driven rod (69) to rotate. The linkage (7) comprises a driving gear (71) provided on the first shaft sleeve (66), a driven gear (72) provided on the second shaft sleeve (68), a first gear (73), a second gear (74), a third gear (75) and a fourth gear (76) rotatably provided in the stove table (1), the first gear (73) is engaged with the driven gear (72), the second gear (74) is coaxially arranged with the first gear (73), the fourth gear (76) is engaged with the driven gear (72), and the third gear (75) is coaxially arranged with the fourth gear (76).

2. The bell-type furnace according to claim 1, characterized in that: The stove table (1) is provided with a touch type counting sensor (12), a spring (13) is arranged in the stove table (1), the spring (13) is connected with a counting block (14), the counting block (14) is slidably connected with the stove table (1), the counting block (14) corresponds to the touch type counting sensor (12), a guide wheel (15) is rotatably arranged on the counting block (14), a guide block (16) is arranged on the first rotating shaft (56), the guide block (16) is in contact with the guide wheel (15), and the first rotating shaft (56) is rotated by a set angle, the guide block (16) pushes the counting block (14) to contact the touch type counting sensor (12).

3. The bell-type furnace according to claim 1, characterized in that: At least two hooks (31) are arranged on the heating cover (3).

4. The bell-type furnace according to claim 1, characterized in that: The upper part of the stove table (1) is of solid structure, the lower part of the stove table (1) is of hollow structure, the rotating sleeve (51) and the second rotating shaft (52) are located in the hollow structure of the lower part of the stove table (1) away from the support table (4), and two sealing rings (11) are arranged on the inner top wall of the hollow structure of the stove table (1), one sealing ring (11) is tightly sleeved on the second rotating shaft (52), and the other sealing ring (11) is tightly sleeved on the rotating sleeve (51).

Images