High and low temperature measuring mechanism of vertical graphitization furnace

Abstract

The utility model relates to the technical field of graphitization furnace temperature monitoring, in particular to a high and low temperature measuring mechanism of a vertical graphitization furnace, which comprises a mounting mechanism, a temperature measuring unit and a limiting unit. The installation mechanism drives a screw-sliding block assembly through a stepping motor, and drives the temperature measuring unit to move back and forth along a guide rail. The temperature measuring unit comprises a low-temperature infrared thermometer and a high-temperature infrared thermometer which are fixed on the two sides of the sliding block through equilateral triangle bolt adjusting structures respectively, so that high-precision alignment with the temperature measuring port is realized; the limiting unit is linked with the sensor through the trigger plate and controls the position of the sliding block so as to switch the temperature measurement mode. When the furnace temperature is lower than 1100 DEG C, the low-temperature thermometer works; and when the voltage is higher than the threshold value, the stepping motor is driven and switched to the high-temperature thermodetector, and the response time is less than or equal to 1 second. According to the utility model, the non-contact infrared temperature measurement technology is adopted, the problem of dynamic sealing failure of a traditional thermocouple is solved, and the temperature measurement efficiency, accuracy and process stability are remarkably improved by combining automatic control and high-precision limiting design.

Description

A high and low temperature measuring mechanism for a vertical graphitization furnace Technical Field

[0001] This utility model relates to the field of graphitization furnace temperature monitoring technology, and in particular to a high and low temperature measuring mechanism for a vertical graphitization furnace. Background Technology

[0002] A vertical graphitization furnace is a high-temperature processing device with a vertical structure, widely used in the carbonization and graphitization processes of carbon materials, graphite electrodes, and carbon fibers. Its core working principle is to rapidly raise the furnace temperature to over 2000℃ through resistance heating or induction heating, enabling carbon materials to complete the recombination and purification of their crystal structure under high-temperature conditions.

[0003] Because the furnace body adopts a vertical layout, the material is usually distributed layer by layer along the longitudinal direction and heated in a gradient manner through the heat flow from top to bottom. This structural feature makes the uniformity of the temperature field inside the furnace crucial. Any local temperature deviation may lead to over-burning, under-burning, or uneven crystallinity of the material, directly affecting the performance and yield of the final product.

[0004] Currently, the industry generally relies on thermocouple contact temperature measurement, which involves directly measuring temperature by inserting a thermocouple probe inside the furnace. This method has the following main problems: 1. Insufficient reliability of the dynamic sealing structure: Thermocouples need to penetrate the furnace wall to enter the furnace chamber, relying on a dynamic sealing device for sealing. However, the furnace is constantly exposed to extremely high temperatures and corrosive gases, making the sealing material prone to aging, carbonization, or wear, leading to seal failure. 2. Insufficient single-point temperature measurement and dynamic monitoring capabilities: Traditional thermocouples typically measure at fixed points, only reflecting local temperatures and failing to capture temperature gradient changes in the vertical direction of a vertical furnace. 3. Low efficiency of manual intermittent temperature measurement, making it difficult to respond promptly to temperature fluctuations. While multi-point fixed installation schemes can cover some areas, they lack adaptive adjustment capabilities, making it difficult to achieve real-time dynamic management of the entire furnace temperature field. 4. Structural complexity and space occupation issues: To achieve thermocouple insertion and protection, multiple temperature measurement holes need to be opened in the furnace body, along with auxiliary devices such as flanges, protective sleeves, and telescopic mechanisms. These additional structures not only encroach on the limited vertical space of the vertical furnace and affect material loading efficiency, but also increase the complexity of the furnace design. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a high and low temperature measurement mechanism for a vertical graphitization furnace. By employing non-contact infrared temperature measurement technology, it solves the problems of traditional thermocouple dynamic sealing failure, poor dynamic temperature response inside the furnace, and large space occupation of traditional temperature measurement methods. Specifically, it is achieved through the following technical solutions.

[0006] This utility model discloses a high and low temperature measuring mechanism for a vertical graphitization furnace, comprising an installation mechanism, a temperature measuring unit, and a limiting unit;

[0007] The mounting mechanism includes a guide rail, a screw, a slider, and a stepper motor. The output end of the stepper motor is coaxially connected to the screw, and the screw is threadedly engaged with the slider to drive the slider to reciprocate along the guide rail.

[0008] The temperature measuring unit includes two symmetrically arranged temperature measuring structures, each containing a low-temperature thermometer and a high-temperature thermometer. The two temperature measuring structures are fixed on a slider and are aligned with the temperature measuring port on the furnace cover by the sliding of the slider.

[0009] The limiting unit includes a trigger plate fixed to the slider and a first sensor, a second sensor, and a third sensor arranged along the guide rail. It is used to limit the movement position of the slider through the cooperation of the trigger plate and the sensors, so as to realize the alignment control between the thermometer and the temperature measuring port.

[0010] Preferably, the temperature measuring port is made of quartz glass or sapphire with a light transmittance of ≥90%.

[0011] Preferably, the low-temperature thermometer is a Raytek infrared thermometer with a temperature range of 250℃ to 1200℃; the high-temperature thermometer is a Fluke Endurance series infrared high-temperature thermometer with a temperature range of 1000℃ to 3200℃.

[0012] Preferably, each temperature measuring structure of the temperature measuring unit includes a mounting plate, an adjusting plate, bolts, and a thermometer. The mounting plate is connected to the adjusting plate by three bolts, and the thermometer is fixed on the adjusting plate. The three bolts are arranged in an equilateral triangle, and the axis of the thermometer is located at the geometric center of the equilateral triangle.

[0013] Preferably, the bottom end of the bolt is rotatably connected to the adjusting plate, and the bolt is threadedly connected to the mounting plate.

[0014] Preferably, the first sensor is located in the middle of the guide rail, and the second and third sensors are symmetrically distributed at both ends of the guide rail;

[0015] When the trigger plate triggers the first sensor, neither of the two temperature measuring structures is aligned with the temperature measuring port. When the second or third sensor is triggered, the corresponding low-temperature thermometer or high-temperature thermometer is aligned with the temperature measuring port.

[0016] Preferably, the stepper motor is controlled by a PLC and automatically switches between the working states of the low-temperature thermometer and the high-temperature thermometer according to a preset temperature threshold.

[0017] Preferably, the preset temperature threshold is 1100℃. When the furnace temperature is below 1100℃, the low-temperature thermometer is aligned with the temperature measuring port; when the furnace temperature is ≥1100℃, the high-temperature thermometer is aligned with the temperature measuring port.

[0018] Preferably, the arc-shaped mounting plate of the mounting mechanism is fixed to the outer surface of the furnace cover, and the arc-shaped mounting plate is connected to the guide rail through several mounting brackets.

[0019] After adopting the above technical solution, the beneficial effects of this utility model are:

[0020] 1. This utility model uses non-contact infrared temperature measurement technology to measure furnace temperature, eliminating the need for thermocouple structures and avoiding furnace atmosphere pollution and safety hazards caused by dynamic seal wear.

[0021] 2. This utility model uses a stepper motor to drive a screw-slider mechanism, combined with PLC control and a limit unit, to complete the position switching of the high and low temperature measuring instrument within 1 second, significantly improving temperature measurement efficiency and process continuity.

[0022] 3. The temperature measuring unit of this utility model adopts an equilateral triangle distribution of bolts and adjustment plates. The position of the temperature measuring instrument axis is finely adjusted by the three bolts to ensure precise alignment with the temperature measuring port and reduce the impact of deviation on the measurement results.

[0023] 4. The limiting unit of this utility model monitors the position of the slider in real time through symmetrically distributed second and third sensors and the middle first sensor, avoiding misalignment of the temperature measuring instrument due to mechanical errors and enhancing the stability of system operation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a three-dimensional view of the high and low temperature measurement mechanism of the vertical graphitization furnace;

[0026] Figure 2 is a three-dimensional view of part of the structure in Figure 1;

[0027] Figure 3 is a front view of Figure 2;

[0028] Figure 4 is a cross-sectional view along line AA in Figure 3;

[0029] Figure 5 is a three-dimensional view of Figure 2 from another perspective;

[0030] Figure 6 is a magnified view of region A in Figure 4;

[0031] Explanation of reference numerals in the attached figures:

[0032] 101 - Furnace lid; 102 - Temperature measuring port;

[0033] 200-Mounting mechanism, 201-Arc-shaped mounting plate, 202-Mounting bracket, 203-Guide rail, 204-Stepper motor, 205-Screw, 206-Slider;

[0034] 210-Temperature measuring unit, 211-Mounting plate, 212-Adjusting plate, 213-Bolt, 214-Thermometer;

[0035] 220 - Limiting unit, 221 - Fixing plate, 222 - Trigger plate, 223 - First sensor, 224 - Second sensor, 225 - Third sensor. Detailed Implementation

[0036] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. Those skilled in the art will recognize that this utility model can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it.

[0037] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this utility model. It should also be noted in the description of this utility model that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] An embodiment of this utility model provides a high and low temperature measuring mechanism for a vertical graphitization furnace. Referring to Figures 1, 2, and 5, the high and low temperature measuring mechanism for the vertical graphitization furnace includes an installation mechanism 200, a temperature measuring unit 210, and a limiting unit 220. The temperature measuring unit 210 and the limiting unit 220 are respectively installed on both sides of the installation mechanism 200. The temperature measuring unit 210 is used to measure the temperature, and the limiting unit 220 is used to limit the position of the temperature measuring unit 210 during temperature measurement.

[0039] The mounting mechanism 200 is installed on the outside of the furnace cover 101. The furnace cover 101 is provided with a temperature measuring port 102. The temperature measuring port 102 is located on the side where the temperature measuring unit 210 is installed on the mounting mechanism 200, so that the temperature measuring unit 210 can detect the temperature inside the furnace through the temperature measuring port 102.

[0040] The temperature measuring port 102 is made of quartz glass or sapphire with a light transmittance of 90% or more, which facilitates the temperature measuring unit 210 to measure the temperature inside the furnace.

[0041] As a further explanation of the above embodiments, referring to Figures 2, 3, and 4, the outer surface of the furnace cover 101 is fixedly installed with the arc-shaped mounting plate 201, and the side of the arc-shaped mounting plate 201 away from the furnace cover 101 is fixed to the first end of a plurality of mounting brackets 202, and the second end of the mounting brackets 202 is fixedly installed with a guide rail 203.

[0042] A stepper motor 204 is fixedly installed at the first end of the guide rail 203. The output end of the stepper motor 204 is coaxially fixed with the screw 205. The screw 205 is rotatably installed on the guide rail 203. The screw 205 is threadedly connected to the slider 206. The slider 206 is slidably disposed inside the guide rail 203.

[0043] A temperature measuring unit 210 is fixedly installed on one side of the stepper motor 204, and a limit unit 220 is fixedly installed on the other side of the stepper motor 204.

[0044] In this embodiment, the stepper motor 204 drives the screw 205 to rotate in the forward and reverse directions, which in turn drives the slider 206 to slide back and forth along the length of the guide rail 203. This further drives the temperature measuring unit 210 mounted on the slider 206 to change position. The position of the temperature measuring unit 210 is limited by the limiting unit 220, which facilitates the temperature measuring unit 210 to complete temperature measurement.

[0045] As a further explanation of the above embodiments, referring to Figures 2, 3, and 4, the temperature measuring unit 210 includes a mounting plate 211, an adjusting plate 212, bolts 213, and a thermometer 214. The mounting plate 211 is fixedly mounted on the upper surface of the slider 206. The adjusting plate 212 is fixedly mounted on the mounting plate 211 by three bolts 213. The adjusting plate 212 is fixed to the thermometer 214.

[0046] The temperature measuring structure, consisting of adjusting plate 212, bolt 213, and thermometer 214, is symmetrically distributed in two groups about the center of mounting plate 211. The thermometer 214 in the first group of the temperature measuring structure is a low-temperature thermometer, and the thermometer 214 in the second group of the temperature measuring structure is a high-temperature thermometer. The thermometers 214 in the two groups can be aligned with the temperature measuring port 102 respectively.

[0047] The stepper motor 204 is controlled by a PLC, which enables it to automatically trigger switching actions according to a preset temperature threshold, ensuring a smooth transition.

[0048] Among them, the low-temperature thermometer adopts Raytek infrared thermometer, preferably the MI3 series, with a temperature range of 250℃~1200℃.

[0049] Among them, the high-temperature thermometer adopts the Fluke Endurance series infrared high-temperature instrument, with a temperature range of 1000℃~3200℃.

[0050] The three bolts 213 are located at the three vertices of the equilateral triangle, and the axis of the thermometer 214 is located at the geometric center of the equilateral triangle. The bottom end of the bolt 213 is rotatably connected to the adjusting plate 212, and the bolt 213 is threadedly connected to the mounting plate 211.

[0051] In this embodiment, through the above structure, when the slider 206 slides back and forth along the length of the guide rail 203, the position of the thermometer 214 in the two sets of temperature measuring structures can be switched. When the furnace temperature is low, the low temperature thermometer is used to align with the temperature measuring port 102 to complete the furnace temperature measurement. When the furnace temperature is high, the high temperature thermometer is used to align with the temperature measuring port 102 to complete the furnace temperature measurement.

[0052] Furthermore, the thermometer 214 is mounted on the mounting plate 211 via the adjusting plate 212 and bolts 213. By rotating the three bolts 213 respectively, the orientation of the thermometer 214 can be finely adjusted, which facilitates the alignment of the thermometer 214 with the temperature measuring port 102 and ensures the stable operation of the temperature measurement process.

[0053] As a further explanation of the above embodiments, referring to Figures 5 and 6, the limiting unit 220 includes a fixing plate 221, a trigger plate 222, a first sensor 223, a second sensor 224, and a third sensor 225. The middle part of the side of the slider 206 away from the temperature measuring unit 210 is fixed to the fixing plate 221. The lower surface of the fixing plate 221 is fixed to the trigger plate 222. The trigger plate 222 can trigger the first sensor 223, the second sensor 224, and the third sensor 225 respectively. The first sensor 223 is located in the middle of the guide rail 203. The second sensor 224 and the third sensor 225 are respectively disposed at both ends of the guide rail 203, and the second sensor 224 and the third sensor 225 are symmetrically distributed about the first sensor 223.

[0054] When the slider 206 is in the middle position of the guide rail 203, the trigger plate 222 triggers the first sensor 223. At this time, neither of the two temperature measuring mechanisms performs temperature measurement. When temperature measurement is required, the stepper motor 204 drives the slider 206 to slide to one side along the guide rail 203, so that the trigger plate 222 triggers the second sensor 224 or the third sensor 225. This indicates that the thermometer 214 in one of the temperature measuring mechanisms is aligned with the temperature measuring port 102. The stepper motor 204 then instructs the slider 206 to continue sliding until the temperature measurement is completed.

[0055] Similarly, when it is necessary to switch between high and low temperature measurement, the stepper motor 204 drives the slider 206 to slide in the opposite direction, so that the trigger plate 222 changes from the position of triggering the second sensor 224 to the position of triggering the third sensor 225, or changes from the position of triggering the third sensor 225 to the position of triggering the second sensor 224.

[0056] This invention completely eliminates the traditional thermocouple temperature measurement method by using infrared temperature measurement technology from two sets of temperature measuring instruments 214, thus solving the problem of dynamic seal failure. Furthermore, combined with the drive of the stepper motor 204 and the high-precision control of the limit unit 220, it achieves automatic switching between high and low temperature ranges, with a response time of less than or equal to 1 second, enabling rapid switching between high and low temperatures.

[0057] The preset temperature threshold is 1100℃. When the furnace temperature is less than 1100℃, the stepper motor 204 drives the low-temperature thermometer to align with the temperature measuring port 102. When the furnace temperature is greater than or equal to 1100℃, the temperature is switched to the high-temperature thermometer.

[0058] The embodiments described above are not exhaustive, nor do they limit the scope of the present invention to the specific embodiments described herein. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to effectively utilize the present invention and its modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high and low temperature measuring mechanism for a vertical graphitization furnace, characterized in that, The system includes an installation mechanism (200), a temperature measuring unit (210), and a limiting unit (220). The installation mechanism (200) includes a guide rail (203), a screw (205), a slider (206), and a stepper motor (204). The output end of the stepper motor (204) is coaxially connected to the screw (205). The screw (205) is threadedly engaged with the slider (206), driving the slider (206) to slide back and forth along the guide rail (203). The temperature measuring unit (210) includes two symmetrically arranged temperature measuring structures, each containing a low-temperature thermometer and a high-temperature thermometer. Two sets of temperature measuring structures are fixed on the slider (206) and are aligned with the temperature measuring port (102) on the furnace cover (101) by the sliding switch of the slider (206); the limiting unit (220) includes a trigger plate (222) fixed on the slider (206) and a first sensor (223), a second sensor (224) and a third sensor (225) arranged along the guide rail (203), which are used to limit the moving position of the slider (206) by the cooperation of the trigger plate (222) and the sensor, so as to realize the alignment control of the thermometer (214) and the temperature measuring port (102).

2. The high and low temperature measuring mechanism for the vertical graphitization furnace according to claim 1, characterized in that, The temperature measuring port (102) is made of quartz glass or sapphire with a light transmittance of ≥90%.

3. The high and low temperature measuring mechanism for the vertical graphitization furnace according to claim 1, characterized in that, The low-temperature thermometer is a Raytek infrared thermometer with a temperature range of 250℃ to 1200℃; the high-temperature thermometer is a Fluke Endurance series infrared high-temperature thermometer with a temperature range of 1000℃ to 3200℃.

4. The high and low temperature measuring mechanism for the vertical graphitization furnace according to claim 1, characterized in that, Each temperature measuring structure of the temperature measuring unit (210) includes a mounting plate (211), an adjusting plate (212), bolts (213), and a thermometer (214). The mounting plate (211) is connected to the adjusting plate (212) by three bolts (213). The thermometer (214) is fixed on the adjusting plate (212), and the three bolts (213) are arranged in an equilateral triangle. The axis of the thermometer (214) is located at the geometric center of the equilateral triangle.

5. The high and low temperature measuring mechanism for the vertical graphitization furnace according to claim 4, characterized in that, The bottom end of the bolt (213) is rotatably connected to the adjusting plate (212), and the bolt (213) is threadedly connected to the mounting plate (211).

6. The high and low temperature measuring mechanism for the vertical graphitization furnace according to claim 1, characterized in that, The first sensor (223) is located in the middle of the guide rail (203), and the second sensor (224) and the third sensor (225) are symmetrically distributed at both ends of the guide rail (203). When the trigger plate (222) triggers the first sensor (223), neither of the two temperature measuring structures is aligned with the temperature measuring port (102). When the second sensor (224) or the third sensor (225) is triggered, the corresponding low temperature thermometer or high temperature thermometer is aligned with the temperature measuring port (102).

7. The high and low temperature measuring mechanism for the vertical graphitization furnace according to claim 1, characterized in that, The stepper motor (204) is controlled by a PLC and automatically switches between the working states of the low-temperature thermometer and the high-temperature thermometer according to a preset temperature threshold.

8. The high and low temperature measuring mechanism for the vertical graphitization furnace according to claim 7, characterized in that, The preset temperature threshold is 1100℃. When the furnace temperature is below 1100℃, the low-temperature thermometer is aligned with the temperature measuring port (102); when the furnace temperature is ≥1100℃, the high-temperature thermometer is aligned with the temperature measuring port (102).

9. The high and low temperature measuring mechanism for the vertical graphitization furnace according to claim 1, characterized in that, The arc-shaped mounting plate (201) of the mounting mechanism (200) is fixed to the outer surface of the furnace cover (101), and the arc-shaped mounting plate (201) is connected to the guide rail (203) through several mounting brackets (202).

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