Batch sintering device based on NTC (Negative Temperature Coefficient) thermistor chip and use method thereof
By designing the preheating unit and thermal circulation pipeline, the waste heat of the NTC thermistor chip is used for preheating, the problem of waste heat waste is solved, and more efficient heat utilization and a more stable sintering process is achieved.
Patent Information
- Application Number
- CN202510710283.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-29
- Publication Date
- 2025-07-22
AI Technical Summary
After the sintering is completed, residual heat remains on the surface of the NTC thermistor chip, resulting in waste of energy. The existing technology has not been effectively utilized, increasing the power consumption of the sintering process.
A batch sintering device is designed, including a preheating unit and a thermal circulation pipeline. The chip to be sintered is preheated using the waste heat of the sintered NTC thermistor chip after sintering, and the stability and uniformity of the sintering process are ensured through structures such as thermal expansion telescopic rods and drive parts.
It improves the efficiency of thermal energy utilization, reduces the power consumption of equipment operation, and improves the uniformity and stability of chip sintering.
Smart Images
Figure CN120351746A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of sintering of NTC thermistor chips, and specifically to a batch sintering device for NTC thermistor chips and its usage method. Background Art
[0002] Batch sintering devices for NTC thermistor chips mainly include tunnel kilns, pusher kilns, bell furnaces, etc. A tunnel kiln is a continuous sintering device that can achieve continuous sintering of chips, with high production capacity and suitable for large-scale production. Its structure is like a long tunnel, and the chips are placed on the kiln cars in the tunnel. The kiln cars move at a constant speed, and the chips successively undergo preheating, sintering, and cooling processes. A pusher kiln is also a continuous sintering device that pushes the chips along the kiln track at a constant speed through a pusher mechanism to complete sintering. The temperature control is precise and can meet different process requirements. A bell furnace is an intermittent sintering device. The tray containing the chips is placed in the furnace chamber, the bell is covered, and after evacuating and filling with a protective gas, it is heated for sintering. After completion, it is removed from the furnace chamber. It has high flexibility and can flexibly adjust the process for sintering chips of different specifications and requirements. After the sintering of NTC thermistor chips is completed, there will be a certain amount of residual heat on the surface. Preheating the NTC thermistor chips before sintering will reduce the time of the sintering process in the NTC thermistor chip sintering furnace, thereby reducing the power consumption of sintering. If the residual heat of the NTC thermistor chips cannot be utilized during batch sintering of NTC thermistor chips, it will cause waste of energy. Therefore, in view of the above problems, a batch sintering device for NTC thermistor chips and its usage method are proposed. Summary of the Invention
[0003] The purpose of the present invention is to provide a batch sintering device for NTC thermistor chips and its usage method to solve the problem that after the sintering of NTC thermistor chips is completed, there will be a certain amount of residual heat on the surface. Preheating the NTC thermistor chips before sintering will reduce the time of the sintering process in the NTC thermistor chip sintering furnace, thereby reducing the power consumption of sintering. If the residual heat of the NTC thermistor chips cannot be utilized during batch sintering of NTC thermistor chips, it will cause waste of energy.
[0004] To achieve the above purpose, the present invention provides the following technical solutions: Batch sintering device based on NTC thermistor chip and its usage method, including a workbench, a power shaft, and a sintering furnace with openings at both ends. One side of the upper end of the workbench is equipped with a sintering furnace. An upper feeding unit is rotatably connected inside the sintering furnace. A preheating unit is installed in the middle of the upper feeding unit. On the other side of the upper feeding unit, a driving member arranged in a cross shape is installed. A power shaft is fixedly connected to the middle of the driving member. Driving grooves are opened on the inner sides of the four circumferences of the driving member; The upper feeding unit includes an upper feeding ring plate. Feeding holes are opened on the inner sides of the four circumferences of the upper feeding ring plate. Heating holes penetrating the upper feeding ring plate are opened at both ends of the feeding holes. An annular groove is opened on the inner side of the lower end of the upper feeding ring plate. Driven columns are distributed equidistantly in a ring shape inside the annular groove; A feeding unit is placed inside any one of the feeding holes. The feeding unit includes a feeding box. Inner buckling grooves are opened on both sides of the upper end inside the feeding box. One lower side of the feeding box is fixedly connected with a thermal expansion telescopic rod. A plurality of tooth teeth are fixedly connected to one side of the moving end of the thermal expansion telescopic rod. An auxiliary unit is installed inside the feeding box. The auxiliary unit includes a driving unit and a storage unit. The storage unit is connected inside the feeding box through the driving unit; The driving unit includes a circular plate. A rotating shaft is fixedly connected to one end of the circular plate. A tooth groove adapted to the tooth teeth is opened in the middle of one of the rotating shafts. A heat insulation plate is fixedly connected to one end of the rotating shaft. A central shaft is connected inside the heat insulation plate through a hairspring.
[0005] As a further optimized content of the present invention, wherein: the central shaft is fixedly connected to the inner wall of the feeding box, and the heat insulation plate is rotatably connected to the inner wall of the feeding box.
[0006] As a further optimized content of the present invention, wherein: the driving grooves opened on the four circumferences of the driving member are adapted to the driven columns, and the central points of the driving member and the annular groove are arranged on the same horizontal plane.
[0007] As a further optimized content of the present invention, wherein: the preheating unit includes a preheating box. Stop material openings are opened on both inner sides of the preheating box. Upper air holes are opened on the inner sides of the upper ends of the stop material openings. A middle through hole for connecting the two stop material openings on both sides is opened in the middle inside the preheating box.
[0008] As a further optimized content of the present invention, wherein: thermal circulation pipes are fixedly connected to both sides of the upper end of the preheating unit through bolts. A circulation fan is installed in the middle of the thermal circulation pipes. A detachable filter plate is installed on one side of the upper end of the thermal circulation pipes.
[0009] As a further optimized content of the present invention, wherein: the overall horizontal projection of the thermal circulation pipes is U-shaped. The two ends of the thermal circulation pipes are connected to the inside of the stop material openings through the upper air holes, and the stop material openings are adapted to the upper feeding ring plate.
[0010] As a further optimized content of the present invention, wherein: the storage unit includes a heating plate, the bottom end of the heating plate is provided with meshes distributed in a matrix, and the inner side of the bottom end of the heating plate is fixedly connected with a plurality of parallel partitions.
[0011] As a further optimized content of the present invention, wherein: circular plates are fixedly connected to both ends of any one of the storage units, and no tooth grooves are provided in the middle of the rotating shaft arranged at the end far from the thermal expansion telescopic rod.
[0012] As a further optimized content of the present invention, wherein: a plurality of driving units and storage units provided inside the feeding unit are provided, and the storage units are parallel to each other.
[0013] As a further optimized content of the present invention, wherein: Step 1: Placement of NTC thermistor chips: Place the NTC thermistor chips that need to be sintered on the side of the partition provided inside the heating plate. After the placement is completed, place the entire feeding unit into the feeding hole to complete the placement of the NTC thermistor chips; Step 2: Equipment operation: Power on the entire equipment. After the power-on is completed, control the power shaft to drive the driving part to rotate. During the rotation of the driving part, through the driving groove and the provided driven column, the rotation of the feeding ring plate is realized. When the feeding hole provided inside the feeding ring plate rotates to the inside of the sintering furnace, the power shaft stops rotating. At this time, the sintering furnace sinters the NTC thermistor chips placed inside; During this process, through the feeding ring plate and the driven column provided inside the ring groove, the isolation between the NTC thermistor chips placed inside the sintering furnace and the outside of the sintering furnace is realized; During the sintering process, when the internal temperature of the thermal expansion telescopic rod reaches about 800 °C, the internal copper-based alloy filler expands due to heat. Control the movement of the mobile end of the thermal expansion telescopic rod. During the movement of the mobile end of the thermal expansion telescopic rod, the rotating shaft rotates slightly through the teeth and the tooth grooves, and after the teeth and the tooth grooves are separated, it is reset under the drive of the clockwork spring, which is used to make the partition vibrate slightly, thereby making the NTC thermistor chips placed inside the heating plate move slightly; Step 3: Preheating of NTC thermistor chips: After the sintering of the NTC thermistor chips is completed, they first move into the material stop port. At the same time, the circulation fan is powered on and runs, and then the hot air inside one of the material stop ports is circulated to the other material stop port to preheat the NTC thermistor chips inside the other material stop port; Step 4: Completion of processing: When preheating the next group of NTC thermistor chips, the sintered NTC thermistor chips move to the corresponding side of the sintering furnace, take out the sintered NTC thermistor chips, and place the NTC thermistor chips that need to be sintered into the feeding hole. In this way, the NTC thermistor chips are batch-cycled and sintered.
[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, through the preheating unit and the heat circulation pipeline provided, the waste heat of the NTC thermistor chip cooled after sintering can be utilized, and the NTC thermistor chip to be sintered can be preheated, improving the utilization efficiency of thermal energy, and thus reducing the power consumption of the overall equipment during operation; 2. In the present invention, through the feeding unit and the thermal expansion telescopic rod provided, the high temperature inside the sintering furnace can be utilized to control the operation of the thermal expansion telescopic rod and drive the heating plate to jolt, so as to control the slight displacement of the sintered NTC thermistor chip, and the position where the NTC thermistor chip intersects with the edge of the hole can be adjusted, further improving the uniformity of the sintering of the NTC thermistor chip; 3. In the present invention, through the driving member, the driven column and the driving groove provided, the feeding unit can be driven to rotate stably. At the same time, the driven column provided can separate the driving groove, ensuring the sealing effect of the NTC thermistor chip inside the sintering furnace and ensuring the stability during the sintering process. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is of the present invention Figure 1 structural schematic diagram at position A; Figure 3 is a schematic diagram of the preheating unit structure of the present invention; Figure 4 is a schematic diagram of the heat circulation pipeline structure of the present invention; Figure 5 is a schematic diagram of the feeding unit structure of the present invention; Figure 6 is a schematic diagram of the feeding unit structure of the present invention; Figure 7 is a schematic diagram of the storage unit structure of the present invention; Figure 8 is of the present invention Figure 7 structural schematic diagram at position B; Figure 9 is a schematic diagram of the rotating shaft structure of the present invention.
[0016] In the figure: 1, workbench; 2, power shaft; 3, driving member; 4, driving groove; 5, preheating unit; 51, preheating box; 52, material stop port; 53, upper air hole; 54, middle through hole; 6, heat circulation pipeline; 7, feeding unit; 71, feeding ring plate; 72, material discharging hole; 73, heating hole; 74, ring groove; 75, driven column; 8. Feeding unit; 81. Feeding box; 82. Inner clamping groove; 83. Auxiliary unit; 831. Driving unit; 8311. Circular plate; 8312. Rotating shaft; 8313. Heat insulation plate; 8314. Tooth groove; 8315. Central shaft; 8316. Hairspring; 832. Storage unit; 8321. Heating plate; 8322. Partition board; 8323. Mesh; 84. Thermal expansion telescopic rod; 85. Teeth; 9. Sintering furnace; 10. Circulating fan; 11. Filter screen plate. Specific implementation mode
[0017] Please refer to Figures 1-9 This invention provides a technical solution: A batch sintering device based on NTC thermistor chips and its usage method, including a workbench 1, a power shaft 2, and a sintering furnace 9 with openings at both ends. A sintering furnace 9 is installed on one side of the upper end of the workbench 1. The inner side of the sintering furnace 9 is rotatably connected with a feeding unit 7. A preheating unit 5 is installed in the middle of the feeding unit 7. On the other side of the feeding unit 7, a driving part 3 arranged in a cross shape is installed. A power shaft 2 is fixedly connected to the middle of the driving part 3. Driving grooves 4 are provided on the inner sides of the four circumferences of the driving part 3; The feeding unit 7 includes a feeding ring plate 71. Feeding holes 72 are provided on the inner sides of the four circumferences of the feeding ring plate 71. Heating holes 73 penetrating through the feeding ring plate 71 are provided at both ends of the feeding holes 72. A ring groove 74 is provided on the inner side of the lower end of the feeding ring plate 71. Driven columns 75 are arranged in an annular and equally spaced manner inside the ring groove 74; A feeding unit 8 is placed inside any one of the feeding holes 72. The feeding unit 8 includes a feeding box 81. Inner clamping grooves 82 are provided on both sides of the upper end inside the feeding box 81. A thermal expansion telescopic rod 84 is fixedly connected to the lower side of one end of the feeding box 81. One side of the moving end of the thermal expansion telescopic rod 84 is fixedly connected with a plurality of teeth 85. An auxiliary unit 83 is installed inside the feeding box 81. The auxiliary unit 83 includes a driving unit 831 and a storage unit 832. The storage unit 832 is connected to the inside of the feeding box 81 through the driving unit 831; The driving unit 831 includes a circular plate 8311. One end of the circular plate 8311 is fixedly connected with a rotating shaft 8312. A tooth groove 8314 adapted to the teeth 85 is provided in the middle of one of the rotating shafts 8312. One end of the rotating shaft 8312 is fixedly connected with a heat insulation plate 8313. A central shaft 8315 is connected to the inside of the heat insulation plate 8313 through a hairspring 8316.
[0018] As a further implementation technical solution of this scheme, the central shaft 8315 is fixedly connected to the inner wall of the feeding box 81, and the heat insulation plate 8313 is rotatably connected to the inner wall of the feeding box 81. Through the above settings, stable limit can be carried out on the rotating shaft 8312; As a further technical solution for the implementation of this solution, the driving grooves 4 opened around the driving member 3 are adapted to the driven columns 75, and the center points of the driving member 3 and the annular groove 74 are arranged on the same horizontal plane. Through the above settings, the driving member 3 can drive the feeding unit 7 to rotate stably, and the provided driven columns 75 have a sealing effect; As a further technical solution for the implementation of this solution, the preheating unit 5 includes a preheating box 51. Both inner sides of the two ends of the preheating box 51 are provided with material stopping openings 52. An upper air hole 53 is opened on the inner side of the upper end of the material stopping opening 52. A middle through hole 54 for connecting the two side material stopping openings 52 is opened in the middle inner side of the preheating box 51. Through the above settings, the waste heat of the NTC thermistor chip after sintering can be reused; As a further technical solution for the implementation of this solution, both sides of the upper end of the preheating unit 5 are fixedly connected by bolts with heat circulation pipes 6. A circulation fan 10 is installed in the middle of the heat circulation pipes 6. A detachable filter plate 11 is installed on one side of the upper end of the heat circulation pipes 6. Through the above settings, the air on both sides of the preheating box 51 can be promoted to circulate; As a further technical solution for the implementation of this solution, the overall horizontal projection of the heat circulation pipe 6 is U-shaped. Both ends of the heat circulation pipe 6 are internally connected to the material stopping opening 52 through the upper air hole 53. The material stopping opening 52 is adapted to the feeding ring plate 71. Through the above settings, the circulation effect can be improved; As a further technical solution for the implementation of this solution, the storage unit 832 includes a heating plate 8321. Mesh holes 8323 distributed in a matrix are opened at the bottom end of the heating plate 8321. A plurality of parallel partition plates 8322 are fixedly connected to the inner side of the bottom end of the heating plate 8321. Through the above settings, the NTC thermistor chips can be stably placed, and at the same time, it is convenient to heat the bottom of the NTC thermistor chips; As a further technical solution for the implementation of this solution, circular plates 8311 are fixedly connected to both ends of any storage unit 832. No tooth grooves 8314 are opened in the middle of the rotating shaft 8312 provided at the end far from the thermal expansion telescopic rod 84. Through the above settings, the high temperature inside the sintering furnace 9 can be utilized as power to control the operation of the thermal expansion telescopic rod 84; As a further technical solution for the implementation of this solution, there are multiple driving units 831 and storage units 832 provided inside the discharging unit 8. The storage units 832 are parallel to each other. Through the above settings, the stability during the sintering process of the NTC thermistor chips is further improved.
[0019] As a further technical solution for the implementation of this solution, Step 1: Placement of the NTC thermistor chip: Place the NTC thermistor chip that needs to undergo the sintering process on the side of the partition plate 8322 provided inside the heating plate 8321. After the placement is completed, place the entire discharging unit 8 into the discharging hole 72 to complete the placement of the NTC thermistor chip; Step 2: Equipment operation: Power on the whole equipment. After the power-on is completed, control the power shaft 2 to drive the driving part 3 to rotate. During the rotation of the driving part 3, through the driving groove 4 and the arranged driven column 75, the rotation of the feeding ring plate 71 is realized. When the feeding hole 72 opened inside the feeding ring plate 71 rotates into the sintering furnace 9, the power shaft 2 stops rotating. At this time, the sintering furnace 9 sinters the NTC thermistor chips placed inside; During this process, through the driven column 75 arranged inside the feeding ring plate 71 and the ring groove 74, the isolation between the NTC thermistor chips placed inside the sintering furnace 9 and the outside of the sintering furnace 9 is realized; During the sintering process, when the internal temperature of the thermal expansion telescopic rod 84 reaches about 800 °C, the internal copper-based alloy filler expands due to heat, controlling the movement of the mobile end of the thermal expansion telescopic rod 84. During the movement of the mobile end of the thermal expansion telescopic rod 84, the rotating shaft 8312 makes a slight rotation through the tooth 85 and the tooth groove 8314. And when the tooth 85 and the tooth groove 8314 are separated, it resets under the drive of the clockwork spring 8316, which is used to make the partition plate 8322 vibrate slightly, and then makes the NTC thermistor chips placed inside the heating plate 8321 move slightly; Step 3: Preheating of NTC thermistor chips: The sintered NTC thermistor chips first move into the material stop port 52. At the same time, the circulation fan 10 is powered on and runs, and then the hot air inside one of the material stop ports 52 is circulated to the other material stop port 52 to preheat the NTC thermistor chips inside the other material stop port 52; Step 4: Processing completion: When preheating the next group of NTC thermistor chips, the sintered NTC thermistor chips move to the corresponding side of the sintering furnace 9. The sintered NTC thermistor chips are taken out, and the NTC thermistor chips to be sintered are placed inside the feeding hole 72. In this way, the NTC thermistor chips are batch-cycled and sintered.
[0020] In this article, specific examples are used to elaborate on the principle and implementation method of the present invention. The description of the above examples is only used to help understand the method of the present invention and its core idea. The above is only the preferred implementation method of the present invention. It should be noted that due to the limited nature of language expression, and objectively there are infinite specific structures. For those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements, retouches or changes can also be made, or the above technical features can be combined in an appropriate way; these improvements, retouches, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of the present invention.
Claims
1. A batch sintering device based on an NTC thermistor chip, comprising a workbench (1), a power shaft (2), and a sintering furnace (9) with openings at both ends, characterized in that: On one side of the upper end of the workbench (1), a sintering furnace (9) is installed. Inside the sintering furnace (9), a feeding unit (7) is rotatably connected. A preheating unit (5) is installed in the middle of the feeding unit (7). On the other side of the feeding unit (7), a driving member (3) arranged in a cross shape is installed. A power shaft (2) is fixedly connected to the middle of the driving member (3). Driving grooves (4) are formed in the inner sides of the four circumferences of the driving member (3). The feeding unit (7) includes a feeding ring plate (71). Feeding holes (72) are formed in the inner sides of the four circumferences of the feeding ring plate (71). Heating holes (73) penetrating through the feeding ring plate (71) are formed at both ends of the feeding holes (72). An annular groove (74) is formed in the inner side of the lower end of the feeding ring plate (71). Driven columns (75) are distributed equidistantly in a ring shape inside the annular groove (74). A feeding unit (8) is placed inside any one of the feeding holes (72). The feeding unit (8) includes a feeding box (81). Inner buckling grooves (82) are formed on both sides of the upper end inside the feeding box (81). A thermal expansion telescopic rod (84) is fixedly connected to the lower side of one end of the feeding box (81). A plurality of tooth teeth (85) are fixedly connected to one side of the moving end of the thermal expansion telescopic rod (84). An auxiliary unit (83) is installed inside the feeding box (81). The auxiliary unit (83) includes a driving unit (831) and a storage unit (832). The storage unit (832) is connected inside the feeding box (81) through the driving unit (831). The driving unit (831) includes a circular plate (8311). A rotating shaft (8312) is fixedly connected to one end of the circular plate (8311). A tooth groove (8314) adapted to the tooth teeth (85) is formed in the middle of one of the rotating shafts (8312). A heat insulation plate (8313) is fixedly connected to one end of the rotating shaft (8312). A central shaft (8315) is connected inside the heat insulation plate (8313) through a clockwork spring (8316).
2. The batch sintering device based on the NTC thermistor chip according to claim 1, wherein: The central shaft (8315) is fixedly connected to the inner wall of the feeding box (81), and the heat insulation plate (8313) is rotatably connected to the inner wall of the feeding box (81).
3. The batch sintering device based on the NTC thermistor chip according to claim 1, characterized in that: The driving grooves (4) formed in the four circumferences of the driving member (3) are adapted to the driven columns (75), and the central points of the driving member (3) and the annular groove (74) are arranged on the same horizontal plane.
4. The batch sintering device based on the NTC thermistor chip according to claim 1, wherein: The preheating unit (5) includes a preheating box (51). Stop material openings (52) are formed in the inner sides of both ends of the preheating box (51). Upper air holes (53) are formed in the inner sides of the upper ends of the stop material openings (52). A middle through hole (54) for connecting the two stop material openings (52) on both sides is formed in the middle inner side of the preheating box (51).
5. The batch sintering device based on the NTC thermistor chip according to claim 1, characterized in that: On both sides of the upper end of the preheating unit (5), a heat circulation pipeline (6) is fixedly connected through bolts. A circulation fan (10) is installed in the middle of the heat circulation pipeline (6). A detachable filter plate (11) is installed on one side of the upper end of the heat circulation pipeline (6).
6. The batch sintering device based on the NTC thermistor chip according to claim 5, wherein: The overall lateral projection of the thermal circulation pipeline (6) is U-shaped. Both ends of the thermal circulation pipeline (6) are internally connected to the inside of the material stop port (52) through upper air holes (53), and the material stop port (52) is adapted to the upper feeding ring plate (71).
7. The batch sintering device based on the NTC thermistor chip according to claim 1, characterized in that: The storage unit (832) includes a heating plate (8321). The bottom end of the heating plate (8321) is provided with meshes (8323) distributed in a matrix, and a plurality of parallel partitions (8322) are fixedly connected to the inner side of the bottom end of the heating plate (8321).
8. The batch sintering device based on the NTC thermistor chip according to claim 1, characterized in that: Both ends of any one of the storage units (832) are fixedly connected with circular plates (8311). No tooth grooves (8314) are provided in the middle of the rotating shaft (8312) arranged at the end far from the thermal expansion telescopic rod (84).
9. The batch sintering device based on the NTC thermistor chip according to claim 1, wherein: A plurality of driving units (831) and storage units (832) are provided inside the discharging unit (8), and the storage units (832) are parallel to each other.
10. The usage method of the batch sintering device based on the NTC thermistor chip according to any one of claims 1-9, characterized in that: Step 1: Placement of the NTC thermistor chip: Place the NTC thermistor chip that needs to undergo the sintering process on the side of the partition (8322) arranged inside the heating plate (8321). After the placement is completed, place the entire discharging unit (8) inside the discharging hole (72) to complete the placement of the NTC thermistor chip. Step 2: Equipment operation: Power on the entire equipment. After the power-on is completed, control the power shaft (2) to drive the driving part (3) to rotate. During the rotation of the driving part (3), through the driving groove (4) and the arranged driven column (75), the upper feeding ring plate (71) is rotated. When the discharging hole (72) provided inside the upper feeding ring plate (71) rotates to the inside of the sintering furnace (9), the power shaft (2) stops rotating. At this time, the sintering furnace (9) sinters the NTC thermistor chips placed inside. During this process, through the upper feeding ring plate (71) and the driven column (75) arranged inside the annular groove (74), the isolation between the NTC thermistor chips placed inside the sintering furnace (9) and the outside of the sintering furnace (9) is realized. During the sintering process, when the internal temperature of the thermal expansion telescopic rod (84) reaches about 800 °C, the internal copper-based alloy filler expands due to heat. Control the movement of the mobile end of the thermal expansion telescopic rod (84). During the movement of the mobile end of the thermal expansion telescopic rod (84), the rotating shaft (8312) is slightly rotated through the tooth teeth (85) and the tooth grooves (8314). And when the tooth teeth (85) and the tooth grooves (8314) are separated, it is reset under the drive of the clockwork spring (8316) to slightly jolt the partition (8322), thereby slightly displacing the NTC thermistor chips placed inside the heating plate (8321). Step 3: Preheating of the NTC thermistor chip: The sintered NTC thermistor chips first move into the material stop port (52). At the same time, the circulation fan (10) is powered on and operates, and then the hot air inside one of the material stop ports (52) is circulated to the other material stop port (52) to preheat the NTC thermistor chips inside the other material stop port (52). Step 4: Completion of processing: When preheating the next group of NTC thermistor chips, the sintered NTC thermistor chips are moved to the corresponding side of the sintering furnace (9), the sintered NTC thermistor chips are taken out, and the NTC thermistor chips to be sintered are placed inside the feeding hole (72). In this way, batch cyclic sintering of the NTC thermistor chips is carried out.