Multi-zone temperature-controlled sintering furnace

Abstract

The utility model discloses a multi -region temperature control formula sintering furnace, it includes: the pedestal, the top side middle part of pedestal inlays fixedly has the heat preservation stove, the inboard inlays fixedly has the silicon carbide inner shell of heat preservation stove, the shell of silicon carbide inner shell is inwards and is installed with a plurality of ring -like electric heating pipes of equidistance inlaid in left and right directions, the bottom of ring -like electric heating pipe all butt -joint has independent wiring pipe, the top of heat preservation stove is equidistantly erected with a plurality of thermocouple temperature sensors, and the thermocouple temperature sensor is by junction box, protective sleeve and thermal resistance constitutes, the outside of protective sleeve is equipped with the external thread and corresponds the threaded connection with the screw sleeve, and the sectional heating is carried out, realizes the temperature controllable operation, maintains the even stable of furnace temperature, in addition sets up a plurality of liftable type thermocouple temperature sensor cooperation and imports the stove and adjusts the thermal resistance position according to the placement height of sintering material to make it close to material surface erection, obtains the accurate heating temperature in the material sintering process, improves the sintering quality.

Description

Technical Field

[0001] This utility model relates to the field of sintering furnace technology, and in particular to a multi-zone temperature-controlled sintering furnace. Background Technology

[0002] A sintering furnace is a device used to heat powdered materials to high temperatures, causing the particles to bond together and form a dense solid. Its working principle includes three stages: heating, sintering, and cooling. In the heating stage, the temperature gradually rises until the set sintering temperature is reached; in the sintering stage, the material begins to undergo plastic deformation and solidification, forming a blocky or dense solid. The main components of a sintering furnace include the furnace body, heating elements, a temperature control system, and an internal atmosphere control system, enabling it to withstand long-term operation in high-temperature environments. The temperature distribution in a material sintering furnace is affected by various factors, including the layout of heating elements, the geometry of the furnace chamber, thermal inertia, heating rate, and holding time. To ensure sintering quality, it is necessary to ensure the uniformity of temperature within the furnace and avoid material performance degradation due to localized overheating. The heating elements commonly used in existing sintering furnaces include resistance coils, resistance elements, and electric furnace tubes, and most of them are integrated for temperature control. When temperature differences occur in the furnace, it is difficult to make targeted temperature control adjustments, which affects the sintering quality of the materials. In addition, different materials are placed at different heights in the sintering furnace, but the temperature measuring elements are mostly fixed at fixed points. They can only measure and calculate the average temperature in the furnace, but there will be errors in measuring the surface temperature of the materials. They cannot adapt to the material placement height and get close to the material surface for more accurate temperature measurement, resulting in insufficient control over the sintering temperature. Utility Model Content

[0003] The purpose of this invention is to provide a multi-zone temperature-controlled sintering furnace, which can achieve temperature control by increasing or decreasing the local output power, maintain a uniform and stable temperature inside the furnace, and adjust the position of the thermal resistor according to the placement height of the sintering material so that it is close to the surface of the material, thereby obtaining the accurate heating temperature of the material during the sintering process and improving the sintering quality.

[0004] To achieve the above objectives, a multi-zone temperature-controlled sintering furnace is provided, comprising: a frame, a holding furnace fixedly fitted to the top center of the frame, a silicon carbide inner shell fixedly fitted to the inner side of the holding furnace, and several annular heating tubes equidistantly fitted and installed in the left-right direction within the silicon carbide inner shell, each annular heating tube having an independent wiring conduit at its bottom end; several thermocouple temperature sensors equidistantly mounted on the top of the holding furnace, each thermocouple temperature sensor consisting of a junction box, a protective sleeve, and a resistance temperature detector (RTD); wherein the junction box is located above the holding furnace and its bottom end is fixed to the protective sleeve; the protective sleeve contains resistance leads, both of which are elongated and slidably embedded inside the holding furnace; and the RTD is fixedly connected to... At the bottom end of the resistance lead, the outer side of the protective sleeve is provided with an external thread and a corresponding threaded sleeve is connected to it. The threaded sleeve is located on the top of the heat preservation furnace and is fixedly connected to it. The left side of the heat preservation furnace is provided with an opening and a sealing cover is threadedly connected to it. The furnace temperature of the sintering furnace is segmented by setting up several equally spaced and independently heated annular electric heating tubes. When a temperature difference occurs, the temperature can be controlled by increasing or decreasing the local output power to achieve controllable operation and maintain a uniform and stable temperature inside the furnace. In addition, several liftable thermocouple temperature sensors are set up to be introduced into the furnace. The position of the thermal resistor is adjusted according to the placement height of the sintering material so that it is close to the surface of the material to obtain the accurate heating temperature during the sintering process and improve the sintering quality.

[0005] According to the multi-zone temperature-controlled sintering furnace, all the independent wiring pipes extend downwards outside the furnace and are equipped with terminals for connecting to an external power source, which is built into the frame. This ensures stable heating.

[0006] According to the multi-zone temperature-controlled sintering furnace, each thermocouple temperature sensor is equipped with a temperature control module. Each annular heating tube has an additional wire connected to the temperature control module. The temperature control module uses an ARD-6TPA temperature process control module and is embedded in the upper-middle part of the front side of the support. This system combines the control of material surface temperature changes with the heating element and performs multi-threaded operation to meet practical requirements.

[0007] According to the multi-zone temperature-controlled sintering furnace, a heat-insulating ring gasket is slidably engaged in the left-right direction on the inner side of the opening of the holding furnace. The heat-insulating ring gasket is made of high-temperature resistant ceramic material. This prevents thermal damage to the sealing cover caused by high temperatures.

[0008] According to the multi-zone temperature-controlled sintering furnace, the upper left edge of the support frame is covered with a collision-resistant strip made of rubber material, which improves operational safety.

[0009] According to the multi-zone temperature-controlled sintering furnace, the inner side of the upper end of each threaded sleeve is filled with a sealing gasket ring, and the inner side of the sealing gasket ring is pressed and sealed against the outer wall of the protective sleeve. This improves the sealing performance and prevents heat leakage.

[0010] According to the multi-zone temperature-controlled sintering furnace, a gas valve is fitted into the corresponding frame on the right side of the holding furnace. The gas valve is used to connect to an external atmosphere regulator. A reserved gas port is provided for connecting to the gas valve regulating equipment of a conventional sintering furnace to manage the composition and pressure of the atmosphere inside the furnace.

[0011] The above-mentioned solution has the following beneficial effects: 1. In this utility model, the furnace temperature of the sintering furnace is segmented by setting up several equally spaced and independently heated annular electric heating tubes. When temperature differences occur, the temperature can be controlled by increasing or decreasing the local output power to achieve controllable operation and maintain a uniform and stable temperature inside the furnace. 2. By setting up several liftable thermocouple temperature sensors and introducing them into the furnace, and adjusting the position of the thermal resistors according to the placement height of the sintering material to make them close to the material surface, the accurate heating temperature of the material during the sintering process can be obtained, thereby improving the sintering quality.

[0012] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is an overall schematic diagram of the multi-zone temperature-controlled sintering furnace of this utility model; Figure 2 This is a cross-sectional view of the holding furnace in the multi-zone temperature-controlled sintering furnace of this utility model; Figure 3 This is a schematic diagram of the thermocouple temperature sensor in the multi-zone temperature-controlled sintering furnace of this utility model; Figure 4 This is a schematic diagram showing the opening and closing of the holding furnace in the multi-zone temperature-controlled sintering furnace of this utility model.

[0014] Legend: 1. Frame; 2. Insulation furnace; 3. Silicon carbide inner shell; 4. Ring-shaped heating element; 5. Independent wiring pipe; 6. Temperature control module; 7. Junction box; 8. Protective sleeve; 9. Resistance temperature detector (RTD); 10. Screw sleeve; 11. Insulating ring gasket; 12. Sealing cover; 13. Anti-collision pad strip. Detailed Implementation

[0015] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0016] Reference Figure 1 and Figure 2 This utility model embodiment provides a multi-zone temperature-controlled sintering furnace, including: a frame 1, a heat preservation furnace 2 fixedly fitted to the top center of the frame 1, a silicon carbide inner shell 3 fixedly fitted to the inner side of the heat preservation furnace 2, and several annular electric heating tubes 4 equidistantly fitted inside the silicon carbide inner shell 3 in the left-right direction. The bottom end of each annular electric heating tube 4 is connected to an independent wiring pipe 5. Each independent wiring pipe 5 extends downward outside the heat preservation furnace 2 and has a wiring terminal inside for connecting to an external power supply. The power supply is built into the frame 1. Several annular electric heating tubes 4 are equidistantly fitted on the top of the heat preservation furnace 2. Each thermocouple temperature sensor is equipped with a temperature control module 6. The independent wiring pipe 5 of the annular heating tube 4 is equipped with a wire to connect to the temperature control module 6. The temperature control module 6 adopts the ARD-6TPA temperature process control module and is embedded in the upper middle part of the front side of the frame 1. Several annular heating tubes 4 are arranged at equal intervals and heated independently to perform segmented heating of the furnace temperature of the sintering furnace. When a temperature difference occurs, the temperature can be controlled by increasing or decreasing the local output power to achieve controllable operation and maintain a uniform and stable temperature inside the furnace.

[0017] Reference Figure 3 As shown, the thermocouple temperature sensor consists of a junction box 7, a protective sleeve 8, and a resistance temperature detector (RTD) 9. The junction box 7 is located above the holding furnace 2, and its bottom end is fixed to the protective sleeve 8. The protective sleeve 8 contains resistance leads, both of which are elongated and slidably embedded inside the holding furnace 2. The RTD 9 is fixedly connected to the bottom end of the resistance leads. The outer side of the protective sleeve 8 has external threads, and a corresponding threaded sleeve 10 is connected to it. The sleeve 10 is located at the top of the holding furnace 2 and is fixedly connected to it. The inner side of the upper end of the sleeve 10 is filled with a sealing gasket ring. The inner side of the sealing gasket ring is pressed and sealed against the outer wall of the protective sleeve 8. The sleeve 10 is designed for adjustable lifting to guide the RTD 9 into the furnace, and the position of the RTD 9 is adjusted to be close to the surface of the material according to the placement height of the sintering material. Reference Figure 4 As shown, the left side of the holding furnace 2 has an opening and a sealing cover 12 is threadedly connected. A heat insulation ring gasket 11 is slidably engaged in the left and right directions inside the opening of the holding furnace 2. The heat insulation ring gasket 11 is made of high-temperature resistant ceramic material. The upper left edge of the frame 1 is covered with an anti-collision pad strip 13, which is made of rubber material. A gas valve is installed on the right side of the holding furnace 2 corresponding to the frame 1. The gas valve is used to connect an external atmosphere regulator, providing a foundation for the assembly of the external structure of the sintering furnace, and also providing safety protection.

[0018] Working principle: In this utility model, the furnace temperature of the sintering furnace is segmented by setting several equally spaced and independently heated annular electric heating tubes 4. When a temperature difference occurs, the temperature can be controlled by increasing or decreasing the local output power to maintain a uniform and stable temperature inside the furnace. In addition, several liftable thermocouple temperature sensors are set in the furnace and the position of the thermal resistor 9 is adjusted according to the placement height of the sintering material to make it close to the surface of the material, so as to obtain the accurate heating temperature of the material during the sintering process and improve the sintering quality.

[0019] In the description of this utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," and "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Furthermore, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "fixed installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A multi-zone temperature-controlled sintering furnace, characterized in that, include: A frame (1) is fitted and fixed to the top center of the frame (1), and a silicon carbide inner shell (3) is fitted and fixed to the inner side of the heat preservation furnace (2). Several annular electric heating tubes (4) are fitted and fixed in the left and right directions within the shell of the silicon carbide inner shell (3), and the bottom end of each annular electric heating tube (4) is connected to an independent wiring pipe (5). Several thermocouple temperature sensors are equidistantly mounted on the top left and right sides of the heat preservation furnace (2). The thermocouple temperature sensors are composed of a junction box (7), a protective sleeve (8), and a thermal resistor (9). The junction box (7) is located above the heat preservation furnace (2) and its bottom end is fixed to the protective sleeve (8). The protective sleeve (8) is covered with a resistance lead wire, and both are designed to be extended and slidably embedded inside the heat preservation furnace (2). The thermal resistor (9) is fixedly connected to the bottom end of the resistance lead wire. The outer side of the protective sleeve (8) is provided with an external thread and a corresponding threaded sleeve (10) is connected to it. The threaded sleeve (10) is located on the top of the heat preservation furnace (2) and is fixedly connected to it. The left side of the heat preservation furnace (2) is provided with an opening and a sealing cap (12) is threadedly connected to it.

2. The multi-zone temperature-controlled sintering furnace according to claim 1, characterized in that, Each of the independent wiring pipes (5) extends downwards outside the heat preservation furnace (2) and is equipped with wiring terminals for external power supply. The power supply is built into the frame (1).

3. The multi-zone temperature-controlled sintering furnace according to claim 1, characterized in that, The thermocouple temperature sensors are all equipped with a temperature control module (6). The independent wiring pipe (5) of the annular heating tube (4) is equipped with a wire to connect to the temperature control module (6). The temperature control module (6) adopts the ARD-6TPA temperature process control module and is embedded in the upper middle part of the front side of the bracket (1).

4. The multi-zone temperature-controlled sintering furnace according to claim 1, characterized in that, The heat insulation ring (11) is slidably engaged with the inner side of the opening of the heat insulation furnace (2) in the left and right directions. The heat insulation ring (11) is made of high temperature resistant ceramic material.

5. The multi-zone temperature-controlled sintering furnace according to claim 1, characterized in that, The upper left edge of the frame (1) is covered with a crash pad (13), which is made of rubber material.

6. The multi-zone temperature-controlled sintering furnace according to claim 1, characterized in that, The inner side of the upper end of the threaded sleeve (10) is filled with a sealing gasket ring, and the inner side of the sealing gasket ring is pressed and sealed against the outer wall of the protective sleeve (8).

7. The multi-zone temperature-controlled sintering furnace according to claim 1, characterized in that, A gas valve is fitted into the right side of the heat preservation furnace (2) corresponding to the frame (1), and the gas valve is used to connect an external atmosphere regulator.

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