Bell jar type sintering furnace for NTC temperature sensor production

Abstract

The utility model discloses a bell jar type sintering furnace for NTC temperature sensor production, which comprises a preheating zone, a sintering zone and a cooling zone which are sequentially arranged according to working procedures and sequentially communicated, the sintering zone is provided with a furnace body frame, a hearth is installed at the upper end of the furnace body frame, the bell jar type sintering furnace further comprises a movable burning bearing table, and the burning bearing table comprises a hydraulic lifting table. A high-temperature-resistant material tray matched with the bottom of the hearth is installed at the upper end of the hydraulic lifting table, a moving assembly is arranged at the lower end of the hydraulic lifting table, a preheating area, a sintering area and a cooling area are sequentially arranged according to the working procedures, materials can be preheated and cooled before and after sintering, and the materials to be sintered can be heated to a certain temperature in advance; the sintering efficiency is improved; and meanwhile, the preheating area can preheat the materials by utilizing heat of the sintering area and the cooling area, so that the energy consumption is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor production equipment, in particular to a bell-shaped sintering furnace for producing NTC temperature sensors. Background Art

[0002] In the process of producing NTC temperature sensors, it is necessary to configure manganese tetraoxide and other metal oxides into slurry according to the process, and dry the slurry with a star-shaped ball mill. The dried slurry is pressed into a columnar rough blank using an ingot forming machine, wrapped with plastic wrap and pressed in an isostatic press. The formed body is sintered in a bell furnace at a certain temperature curve. In order to improve production efficiency, it is generally necessary to preheat it during the sintering process, and after sintering, it must be cooled to wait for the next step.

[0003] However, in the prior art, bell-shaped sintering furnaces generally only have sintering functions. For example, the Chinese patent with patent number CN102032782A discloses a bell-shaped furnace, which is mainly composed of a furnace frame, a furnace and a scissor-type hydraulic lifting platform. The furnace frame is an upper and lower structure, with the furnace fixed on the upper part and the scissor-type hydraulic lifting platform fixed on the lower part. Refractory mounting plates are installed around and on the top of the furnace. The inner wall of the refractory mounting plate is riveted with a fiber felt insulation layer, and the inner wall of the fiber felt insulation layer is bonded with a refractory layer composed of modular splicing. Several U-shaped heating element silicon-molybdenum rods distributed around the square furnace are inserted at the top of the furnace, an exhaust port is opened at the top of the furnace, and a thermocouple is inserted into the furnace from the top. The two sides of the scissor-type lifting platform are respectively hinged with driving cylinders, and the loading platform is covered with a burning plate. The travel switch limits the position of the scissor lift. A firing platform is installed on the upper part of the scissor hydraulic lift. The firing platform includes a loading platform and a firing plate. The loading platform is composed of ceramic fiber products and multiple groups of corundum mullite tubes. For example, the bell-shaped sintering furnace of the above structure lacks preheating and cooling functions. Therefore, it is necessary to design a bell-shaped sintering furnace with preheating and cooling for the production of NTC temperature sensors. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the problems existing in the prior art, the utility model provides a bell-type sintering furnace for the production of NTC temperature sensors. The furnace is provided with a preheating zone, a sintering zone and a cooling zone in sequence according to the process. The furnace can preheat and cool the materials before and after sintering, and can heat the materials to be sintered to a certain temperature in advance, thereby improving the sintering efficiency. At the same time, the preheating zone can utilize the heat of the sintering zone and the cooling zone to preheat the materials, thereby effectively reducing energy consumption.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A bell-shaped sintering furnace for producing NTC temperature sensors comprises a preheating zone, a sintering zone and a cooling zone which are arranged in sequence according to the process and are connected in sequence. The sintering zone is provided with a furnace body frame, a furnace chamber is installed at the upper end of the furnace body frame, and a movable firing platform is also provided. The firing platform comprises a hydraulic lifting platform, a high-temperature resistant material tray adapted to the bottom of the furnace chamber is installed at the upper end of the hydraulic lifting platform, and a movable component is provided at the lower end of the hydraulic lifting platform.

[0007] Preferably, a first channel is provided between the preheating zone and the sintering zone, and a second channel is provided between the sintering zone and the cooling zone.

[0008] Preferably, the first channel, the second channel, the inlet of the firing platform in the preheating zone, and the outlet of the firing platform in the cooling zone are all provided with insulating doors.

[0009] Preferably, the material tray is a cake-shaped structure whose length and width increase in sections from top to bottom, and a sintering inlet which is concave-convexly sealed with the material tray is provided at the bottom of the furnace.

[0010] Preferably, a heat recovery device is also provided, wherein the recovery end of the heat recovery device is connected to the gas outlets of the cooling zone and the sintering zone, and the output end is connected to the preheating zone.

[0011] Preferably, the moving component is a moving wheel.

[0012] Preferably, slide rails for the moving wheels to travel are provided between the preheating zone, the sintering zone and the cooling zone.

[0013] Preferably, the slide rail is provided with a limiting protrusion upward for limiting the moving wheel, and the lower end of the heat insulation door is provided with a sealing groove capable of concave-convex sealing with the limiting protrusion.

[0014] Beneficial effects: Compared with the prior art, the utility model has the following advantages: a preheating zone, a sintering zone and a cooling zone are arranged in sequence according to the process, the material can be preheated and cooled before and after sintering, the material to be sintered can be heated to a certain temperature in advance, and the sintering efficiency is improved; at the same time, the preheating zone can use the heat of the sintering zone and the cooling zone to preheat the material, effectively reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of the exterior of the utility model;

[0016] Figure 2 The internal three-dimensional structure of the sintering zone of the utility model Figure 1 ;

[0017] Figure 3 The internal three-dimensional structure of the sintering zone of the utility model Figure 2 ;

[0018] Figure 4 This is a schematic diagram of the connection between the slide rail and the heat insulation door of the utility model;

[0019] Among them: 1. Preheating zone; 2. Sintering zone; 21. Furnace frame; 22. Furnace chamber; 3. Cooling zone; 4. Firing platform; 41. Hydraulic lifting platform; 42. Material tray; 43. Moving wheel; 5. First channel; 6. Second channel; 7. Insulated door; 71. Sealing groove; 8. Slide rail; 81. Limiting protrusion; 11. Heat recovery device. DETAILED DESCRIPTION

[0020] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0021] Any feature disclosed in this specification (including any additional claims, abstracts and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0022] like Figure 1-4 As shown, a bell-type sintering furnace for producing NTC temperature sensors includes a preheating zone 1, a sintering zone 2 and a cooling zone 3 which are arranged in sequence according to the process and connected in sequence, the sintering zone is provided with a furnace body frame 21, a furnace chamber 22 is installed at the upper end of the furnace body frame 21, and also includes a movable firing platform 4, the firing platform 4 includes a hydraulic lifting platform 41, a high temperature resistant material tray 42 adapted to the bottom of the furnace chamber 22 is installed at the upper end of the hydraulic lifting platform 41, and a moving component is provided at the lower end of the hydraulic lifting platform 41.

[0023] The preheating zone, sintering zone and cooling zone are arranged in sequence according to the working procedures, which can preheat and cool the materials before and after sintering, and can heat the materials to be sintered to a certain temperature in advance; at the same time, the preheating zone, sintering zone and cooling zone can work at the same time, which improves the working efficiency.

[0024] In this embodiment, a first channel 5 is provided between the preheating zone 1 and the sintering zone 2, and a second channel 6 is provided between the sintering zone 2 and the cooling zone 3 for the passage of the sintering platform.

[0025] In this embodiment, the first channel 5, the second channel 6, the inlet of the sintering table of the preheating zone 1, and the outlet of the sintering table of the cooling zone 3 are all provided with an insulating door 7, so that the preheating zone, the sintering zone and the cooling zone can complement each other when working. At the same time, when preheating the material, the insulating door of the first channel can also be opened to utilize the heat of the sintering zone.

[0026] In this embodiment, the material tray 42 is a cake-shaped structure that increases in length and width from top to bottom. A sintering inlet is provided at the bottom of the furnace 22 and is concavely and convexly sealed with the material tray 42. This structure can achieve good sealing and improve the stability of sintering.

[0027] In this embodiment, a heat recovery device 11 is also provided, the recovery end of the heat recovery device 11 is connected to the air outlets of the cooling zone 3 and the sintering zone 2, and the output end is connected to the preheating zone 1. At the same time, the preheating zone can use the heat of the sintering zone and the cooling zone to preheat the material, effectively reducing energy consumption.

[0028] In this embodiment, the moving component is a moving wheel 43 , and a slide rail 8 for the moving wheel 43 to move is provided between the preheating zone 1 , the sintering zone 2 and the cooling zone 3 .

[0029] In this embodiment, the slide rail 8 is provided with a limiting protrusion 81 upward for limiting the moving wheel 43, and the lower end of the thermal insulation door 7 is provided with a sealing groove 71 that can be concave-convexly sealed with the limiting protrusion 81, thereby improving the sealing performance of the thermal insulation door.

[0030] The purpose of the above embodiments is to exemplarily reproduce and deduce the technical solution of the utility model, and to fully describe the technical solution, purpose and effect of the utility model. Its purpose is to make the public understand the disclosed content of the utility model more thoroughly and comprehensively, and it does not limit the protection scope of the utility model.

[0031] The above embodiments are not exhaustive enumerations based on the present invention, and there may be multiple other implementations not listed. Any replacement and improvement made without violating the concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A bell-shaped sintering furnace for producing NTC temperature sensors, characterized in that: The invention comprises a preheating zone (1), a sintering zone (2) and a cooling zone (3) which are arranged in sequence according to the process and are connected in sequence. The sintering zone is provided with a furnace frame (21). A furnace chamber (22) is installed at the upper end of the furnace frame (21). The invention also comprises a movable firing platform (4). The firing platform (4) comprises a hydraulic lifting platform (41). A high-temperature resistant material tray (42) adapted to the bottom of the furnace chamber (22) is installed at the upper end of the hydraulic lifting platform (41). A movable component is provided at the lower end of the hydraulic lifting platform (41).

2. The bell-shaped sintering furnace for producing NTC temperature sensors according to claim 1, characterized in that: A first channel (5) is provided between the preheating zone (1) and the sintering zone (2), and a second channel (6) is provided between the sintering zone (2) and the cooling zone (3).

3. The bell-shaped sintering furnace for producing NTC temperature sensors according to claim 2, characterized in that: The first channel (5), the second channel (6), the inlet of the firing platform of the preheating zone (1), and the outlet of the firing platform of the cooling zone (3) are all provided with an insulating door (7).

4. The bell-shaped sintering furnace for producing NTC temperature sensors according to claim 1, characterized in that: The material tray (42) is a cake-shaped structure whose length and width increase in sections from top to bottom, and a sintering inlet which is concave-convexly sealed with the material tray (42) is provided at the bottom of the furnace (22).

5. The bell-shaped sintering furnace for producing NTC temperature sensors according to claim 1, characterized in that: A heat recovery device (11) is also provided, wherein the recovery end of the heat recovery device (11) is connected to the air outlets of the cooling zone (3) and the sintering zone (2), and the output end is connected to the preheating zone (1).

6. The bell-shaped sintering furnace for producing NTC temperature sensors according to claim 1, characterized in that: The moving component is a moving wheel (43).

7. The bell-shaped sintering furnace for producing NTC temperature sensors according to claim 6, characterized in that: A slide rail (8) for the moving wheel (43) to move is provided between the preheating zone (1), the sintering zone (2) and the cooling zone (3).

8. The bell-shaped sintering furnace for producing NTC temperature sensors according to claim 7, characterized in that: The slide rail (8) is provided with a limiting protrusion (81) upwardly for limiting the position of the moving wheel (43), and the lower end of the heat insulation door (7) is provided with a sealing groove (71) capable of sealing with the limiting protrusion (81).

Images