High-purity graphite drying furnace with circulating air duct structure

Abstract

The utility model provides a high-purity graphite drying furnace with a circulating air duct structure, which belongs to the technical field of graphite drying furnaces and comprises a drying furnace body, a transverse circulating air duct, a longitudinal circulating air duct and an air duct switching device. The transverse circulating air duct and the longitudinal circulating air duct are both arranged in the drying furnace body, and the air duct switching device is used for controlling connection and disconnection of the transverse circulating air duct and the longitudinal circulating air duct; an air outlet of the transverse circulating air duct is opposite to the side wall of one side of the drying area and is used for horizontally blowing hot air to the graphite materials in the drying area; an air outlet of the longitudinal circulating air duct is located at the bottom of the drying area and used for making hot air vertically and upwards blown to graphite materials in the drying area, and a material frame is arranged in the drying furnace body. Therefore, the technical problems of non-uniform drying and low efficiency are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to graphite drying furnace technical field, specifically, relate to a high purity graphite drying furnace with circulating air duct structure. BACKGROUND

[0002] High purity graphite refers to the graphite material containing carbon more than 99.99%, because it has high purity, good conductivity, high temperature resistance, chemical stability and other excellent performance, is widely used in semiconductor manufacturing, nuclear reactor, high-end battery and other high-tech fields. In these fields, the quality of high purity graphite directly affects the performance and reliability of the product, so the requirement of its production process is extremely strict, and the drying link is a crucial link. High purity graphite drying furnace is a device specially used for removing moisture and other volatile impurities in high purity graphite material, and its working principle is that the circulating hot air is in full contact with the graphite material to take away the moisture in the material, so that the graphite reaches the specified drying degree. In the drying process, not only the effective removal of moisture should be ensured, but also the purity of graphite should be ensured, and the introduction of impurities or the change of graphite structure caused by the drying process should be avoided.

[0003] However, the traditional graphite drying furnace has many drawbacks when used for drying high purity graphite. On the one hand, most of the traditional drying furnaces adopt a single fixed circulating air duct structure, which cannot adapt to the various shapes and stacking methods of high purity graphite materials. Since high purity graphite may appear in different forms in the production process, such as thin sheets, blocks and granules, a single air duct cannot ensure that the hot air uniformly acts on all parts of the material, which may cause uneven drying and result in over-drying or under-drying of some materials, affecting the consistency of product quality. On the other hand, the air duct design of the traditional drying furnace has serious defects in sealing and cleanliness. The joints of the air duct are prone to gaps, which may cause hot air leakage, not only reducing the drying efficiency, but also allowing dust, impurities and other pollutants from the outside to enter the drying area, polluting the high purity graphite material and reducing its purity. At the same time, the inner surface of the air duct is not smooth enough, which may accumulate dust and impurities, and these pollutants may be blown to the graphite material along with the airflow during the hot air circulation, further affecting the product quality. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a high purity graphite drying furnace with circulating air duct structure, which solves the technical problems of uneven drying and low efficiency caused by the single air duct structure of the traditional graphite drying furnace, which cannot adapt to graphite materials with different shapes and stacking methods.

[0005] The utility model is implemented as follows:

[0006] The utility model provides a kind of high purity graphite drying furnace with circulating air duct structure, wherein, including drying furnace body, transverse circulating air duct, longitudinal circulating air duct and air duct switching device;The transverse circulating air duct and longitudinal circulating air duct are all arranged in drying furnace body, and the air duct switching device is used to control the on-off of transverse circulating air duct and longitudinal circulating air duct;The air outlet of the transverse circulating air duct is oppositely arranged with the side wall of drying area, for making hot air horizontally blow to graphite material in drying area;The air outlet of the longitudinal circulating air duct is located at the bottom of drying area, for making hot air vertically upward blow to graphite material in drying area, and material rack is arranged in the drying furnace body.

[0007] The technical effects of the high purity graphite drying furnace with circulating air duct structure are as follows: by setting two different modes of transverse circulating air duct and longitudinal circulating air duct, and being equipped with air duct switching device, the drying furnace can flexibly select appropriate air duct mode according to the shape and stacking mode of graphite material. For flat sheet graphite, transverse circulating air duct mode can make hot air horizontally quickly take away moisture; for high stacked block graphite, longitudinal circulating air duct mode can realize uniform drying from bottom to top. The adaptability and flexibility of the drying furnace to different materials are significantly improved, and the drying efficiency and quality are effectively improved.

[0008] Based on the above technical scheme, the high purity graphite drying furnace with circulating air duct structure can be further improved as follows:

[0009] The air duct switching device includes a switching valve body, a driving mechanism and a transmission assembly; the switching valve body is arranged at the intersection of the transverse circulating air duct and the longitudinal circulating air duct, for blocking or conducting the air duct; the driving mechanism is arranged outside the drying furnace body, and the transmission assembly connects the driving mechanism and the switching valve body, for transmitting the power of the driving mechanism to the switching valve body to drive the switching valve body to act.

[0010] The beneficial effects of the above improvement scheme are: the air duct switching device is composed of a switching valve body, a driving mechanism and a transmission assembly, which clearly defines the division of labor and connection relationship of each component. The switching valve body is located at the intersection of the air duct, which can accurately control the on-off of the air duct; the driving mechanism is arranged outside the drying furnace body, which is convenient for operators to operate; the transmission assembly effectively transmits power, so that the switching valve body acts stably. This structure design makes the air duct switching operation simple and reliable, ensures the accuracy and stability of air duct mode switching, and thus guarantees the drying effect.

[0011] Further, the switching valve body includes a valve plate and a valve seat, the valve seat is fixedly installed on the inner wall of the air duct at the intersection of the transverse circulating air duct and the longitudinal circulating air duct, and the valve plate is in sliding cooperation with the valve seat, which realizes the blocking of the transverse circulating air duct or the longitudinal circulating air duct by sliding on the valve seat.

[0012] The beneficial effects of the above improvement scheme are: the structure is simple and compact, easy to manufacture and install, and the sliding fit can ensure the stability and reliability of the valve plate during operation, effectively prevent hot air leakage, improve the sealing and reliability of the air duct switching, and thus improve the drying efficiency and energy utilization rate of the drying furnace.

[0013] Further, the valve seat is annular, and its inner ring surface is smoothly connected with the inner walls of the transverse circulating air duct and the longitudinal circulating air duct; the valve plate is disc-shaped, with a diameter matching the inner ring diameter of the valve seat, and a sealing rubber strip is arranged at the edge of the valve plate.

[0014] The beneficial effects of the above improvement scheme are: this design makes the hot air flow more smoothly in the air duct, avoids hot air vortex and energy loss caused by unreasonable air duct structure, effectively prevents hot air leakage, ensures the stability of hot air temperature and flow in the drying area, and improves the drying quality and efficiency.

[0015] Further, the driving mechanism is a manual knob, which is rotatably installed on the outer side wall of the drying furnace body, and the transmission assembly includes a transmission shaft, one end of which is fixedly connected with the manual knob, and the other end penetrates the side wall of the drying furnace body and is connected with the switching valve body.

[0016] The beneficial effects of the above improvement scheme are: the driving mechanism adopts a manual knob, which is connected with the switching valve body through a transmission shaft, and the structure is simple and intuitive. The operator can easily realize air duct switching by rotating the manual knob. Without complex control equipment, the equipment cost and operation difficulty are reduced, and the manual operation mode is more reliable and less prone to failure, facilitating maintenance and use.

[0017] Further, the transmission assembly includes a linkage mechanism, which includes a plurality of links that are hingedly connected with each other, one end of the linkage mechanism is connected with the driving mechanism, and the other end is connected with the switching valve body. The linkage mechanism drives the driving mechanism to drive the switching valve body.

[0018] The beneficial effects of the above improvement scheme are: the transmission assembly adopts a linkage mechanism, which transmits power through a plurality of hingedly connected links, can accurately transmit the action of the driving mechanism to the switching valve body, and has a certain buffering and adjusting effect, which can adapt to certain installation errors and action deviations. This structure makes the air duct switching process more stable and flexible, ensures the accuracy and reliability of the action of the switching valve body, and improves the overall performance of the drying furnace.

[0019] Further, the transverse circulating air duct comprises a transverse main air duct and a plurality of transverse branch air ducts, the transverse main air duct is arranged at one side of the drying area along the length direction of the drying furnace body, the plurality of transverse branch air ducts are spaced and communicated with the transverse main air duct, and the air outlets of the plurality of transverse branch air ducts are all directed to the graphite material in the drying area.

[0020] The beneficial effect of the above improvement scheme is that: this structure can make the hot air uniformly distributed on one side of the drying area, and the plurality of branch air ducts can blow air from different positions to the graphite material, ensuring sufficient contact between the hot air and the graphite material, and improving the drying uniformity and efficiency under the transverse circulating air duct mode.

[0021] Further, the transverse branch air duct is connected with the transverse main air duct at an acute angle, and an air valve with adjustable opening degree is arranged on each transverse branch air duct.

[0022] The beneficial effect of the above improvement scheme is that: the acute angle connection mode helps the hot air to smoothly enter the branch air duct, reducing the resistance; the adjustable air valve can flexibly adjust the air volume of each branch air duct according to the actual drying demand. For graphite materials of different thickness and humidity, the hot air flow of each branch air duct can be controlled through the air valve, so that the drying is more accurate and efficient, and the drying quality and adaptability are further improved.

[0023] Further, the longitudinal circulating air duct comprises a longitudinal main air duct and a plurality of longitudinal branch air ducts, the longitudinal main air duct is arranged at the bottom of the drying furnace body, the plurality of longitudinal branch air ducts are spaced and communicated with the longitudinal main air duct, and the air outlets of the plurality of longitudinal branch air ducts are all directed upward to the graphite material in the drying area.

[0024] The beneficial effect of the above improvement scheme is that: this structure makes the hot air uniformly blow upward from the bottom of the drying area, and for the high stacked block graphite, the hot air can effectively penetrate the material layer, realizing uniform drying from the bottom to the top, avoiding the situation that the bottom is too dry and the top is not dry, and greatly improving the drying effect and efficiency under the longitudinal circulating air duct mode.

[0025] Further, the material rack is located between the air outlet of the transverse circulating air duct and the air outlet of the longitudinal circulating air duct, and is used for carrying the graphite material, the material rack comprises a frame and a carrying net arranged in the frame, and the frame is slidably connected with the inner wall of the drying furnace body through a sliding rail.

[0026] The beneficial effect of the above improvement scheme is that: the setting of the material rack makes the graphite material in a suitable position during the drying process, facilitating the full contact between the hot air and the material, and also facilitating the placement and removal of the material by the operator, improving the convenience of the drying operation.

[0027] Compared with the prior art, the high-purity graphite drying furnace with the circulating air duct structure has the beneficial effects that:

[0028] The unique circulating air duct structure design effectively solves the problem of uneven drying of the traditional drying furnace. The double-mode switching of the horizontal circulating air duct and the vertical circulating air duct can flexibly select a suitable drying mode according to the shape and stacking mode of the high-purity graphite material. For the flat and sheet-shaped high-purity graphite, the horizontal circulating air duct mode can make the hot air blow horizontally and uniformly over the surface of the material, quickly remove the moisture, and avoid local overheating or dry cracking. For the high and block-shaped high-purity graphite, the vertical circulating air duct mode can make the hot air penetrate the material layer from the bottom to the top, realizing uniform drying from bottom to top. At the same time, the multiple branch air ducts of the horizontal circulating air duct cooperate with the adjustable opening degree air valve, and the horn-shaped diffusion cover at the top of the vertical circulating air duct, further ensuring the uniform distribution of the hot air in the drying area, so that each part of the high-purity graphite material can be uniformly heated, effectively preventing quality problems caused by uneven drying, such as density difference, uneven impurity distribution, etc.

[0029] The utility model highly values the sealing and cleanliness in the design of the air duct structure and components. The valve plate and valve seat sliding cooperation structure is adopted for the switching valve body, the sealing rubber strip is arranged at the edge of the valve plate, and the inner ring surface of the valve seat and the air duct inner wall are smoothly transitioned, effectively preventing hot air leakage and avoiding external pollutants from entering the drying area. The air duct inner wall surface is finely processed and smooth, reducing the accumulation of dust and impurities, and reducing the corner and vortex generation area in the air duct design, making the hot air flow more smooth, further reducing the possibility of pollutant attachment and entry. This high sealing and cleanliness design ensures that the high-purity graphite will not be polluted during the drying process, maintains its high-purity characteristics, meets the requirements of semiconductor, nuclear industry and other industries for extremely low impurity content of high-purity graphite, and improves the product qualification rate and market competitiveness;

[0030] The optimized design of the circulating air duct effectively reduces the heat loss of the hot air in the air duct. The smooth transition and reasonable layout of the air duct inner wall reduce the hot air flow resistance and reduce the energy loss caused by vortex and friction. At the same time, the precise drying mode selection realized by the air duct switching device can provide appropriate hot air flow and temperature according to the actual needs of the high-purity graphite material, avoiding unnecessary energy waste. In addition, the cooperation of the vertical circulating air duct and the horizontal circulating air duct makes the hot air more fully exchange heat with the material, improving the heat utilization efficiency. These designs greatly reduce the energy consumption in the drying process, reduce the production cost, improve the economic benefit of the enterprise, meet the current energy-saving and environmental protection development trend, and enhance the cost advantage of the enterprise in the high-purity graphite production field. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0032] Figure 1 It is a high-purity graphite drying furnace example drawing with a circulating air duct structure;

[0033] Figure 2 It is a perspective view of a high-purity graphite drying furnace with a circulating air duct structure;

[0034] Figure 3 It is a perspective side view of a high-purity graphite drying furnace with a circulating air duct structure;

[0035] In the drawings, the component list represented by each reference numeral is as follows:

[0036] 10, drying furnace body; 11, material rack; 20, transverse circulating air duct; 30, longitudinal circulating air duct; 40, air duct switching device; 41, switching valve body; 42, driving mechanism; 43, transmission assembly. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application.

[0038] As Figure 1 shown, it is a first embodiment of a high-purity graphite drying furnace with a circulating air duct structure provided by the present application. In this embodiment, it comprises a drying furnace body 10, a transverse circulating air duct 20, a longitudinal circulating air duct 30 and an air duct switching device 40. The transverse circulating air duct 20 and the longitudinal circulating air duct 30 are both arranged in the drying furnace body 10, and the air duct switching device 40 is used to control the on-off of the transverse circulating air duct 20 and the longitudinal circulating air duct 30. The air outlet of the transverse circulating air duct 20 is arranged opposite to the side wall of the drying area, which is used to make the hot air blow horizontally to the graphite material in the drying area. The air outlet of the longitudinal circulating air duct 30 is located at the bottom of the drying area, which is used to make the hot air blow vertically upward to the graphite material in the drying area. The drying furnace body 10 is provided with a material rack 11.

[0039] The graphite material is placed in a suitable position in the drying furnace, the required air duct mode is determined according to the shape and stacking mode of the graphite, the transverse circulating air duct 20 mode or the longitudinal circulating air duct mode is selected through the air duct switching device, and the drying furnace is started, and hot air is used to dry the graphite according to the selected air duct mode.

[0040] As shown in Figure 2 , Figure 3 The switching valve body 41 is arranged at the intersection of the transverse circulating air duct and the longitudinal circulating air duct 30, and is used to block or open the air duct; the driving mechanism 42 is arranged outside the drying furnace body 10, the transmission assembly 43 is connected between the driving mechanism 42 and the switching valve body 41, and is used to transmit the power of the driving mechanism 42 to the switching valve body 41, so as to drive the switching valve body 41 to act.

[0041] The operator operates the driving mechanism outside the drying furnace body, the driving mechanism transmits power to the switching valve body through the transmission assembly, the switching valve body acts at the intersection of the air duct, blocks or opens the corresponding air duct, completes the air duct mode switching, and then starts the drying furnace to perform the drying operation.

[0042] Further, in the above technical solution, the switching valve body 41 includes a valve plate and a valve seat, the valve seat is fixedly installed in the inner wall of the air duct at the intersection of the transverse circulating air duct 20 and the longitudinal circulating air duct 30, and the valve plate is in sliding fit with the valve seat and blocks the transverse circulating air duct 20 or the longitudinal circulating air duct 30 by sliding on the valve seat.

[0043] When it is necessary to switch the air duct mode, the driving mechanism drives the valve plate to slide on the valve seat, so that the valve plate blocks the unnecessary air duct and opens the required air duct, and after the air duct switching is completed, the hot air in the drying furnace dries the graphite material according to the new air duct mode.

[0044] Further, in the above technical solution, the valve seat is in the form of a circular ring, the inner ring surface thereof is smoothly connected with the inner wall of the transverse circulating air duct 20 and the longitudinal circulating air duct 30, the valve plate is in the form of a disc, the diameter of the valve plate is matched with the inner ring diameter of the valve seat, and a sealing rubber strip is arranged at the edge of the valve plate.

[0045] When the air duct mode is switched, after the valve plate is slid in place on the valve seat, due to the smooth transition of the valve seat and the sealing rubber strip of the valve plate, the hot air stably and smoothly flows in the open air duct, and the graphite material is efficiently dried, and there is no need to worry about the problems of hot air leakage and poor flow during the drying.

[0046] Further, in the above technical solution, the driving mechanism 42 is a manual knob, the manual knob is rotatably installed on the outer side wall of the drying furnace body 10, and the transmission assembly 43 comprises a transmission shaft, one end of the transmission shaft is fixedly connected with the manual knob, and the other end penetrates through the side wall of the drying furnace body 10 and is connected with the switching valve body 41.

[0047] Further, in the above technical solution, the transmission assembly 43 comprises a linkage mechanism, the linkage mechanism comprises a plurality of links that are hingedly connected with each other, one end of the linkage mechanism is connected with the driving mechanism 42, and the other end is connected with the switching valve body 41, and the driving of the driving mechanism 42 on the switching valve body 41 is realized through the linkage of the linkage mechanism.

[0048] The operator operates the driving mechanism, the driving mechanism drives the linkage mechanism to act, the linkage mechanism transmits power to the switching valve body through the linkage of the links, so that the switching valve body accurately acts at the intersection of the air ducts, the air duct mode switching is realized, and then the drying furnace dries the graphite according to the new air duct mode.

[0049] Further, in the above technical solution, the transverse circulating air duct 20 comprises a transverse main air duct and a plurality of transverse branch air ducts, the transverse main air duct is arranged on one side of the drying area along the length direction of the drying furnace body 10, the plurality of transverse branch air ducts are spaced apart and communicated with the transverse main air duct, and the air outlets of the plurality of transverse branch air ducts all face the graphite material in the drying area.

[0050] After the transverse circulating air duct mode is selected, the hot air first enters the transverse main air duct, and then is uniformly blown to the graphite material in the drying area through the transversely distributed transverse branch air ducts, and the operator can appropriately adjust the positions or directions of the transverse branch air ducts according to the laying condition of the graphite, so as to ensure that the hot air better acts on the graphite and completes the drying operation.

[0051] Further, in the above technical solution, the transverse branch air duct is connected with the transverse main air duct at an acute angle, and an air valve with adjustable opening degree is arranged on each transverse branch air duct.

[0052] Before the graphite is dried by using the transverse circulating air duct mode, the opening degrees of the air valves on the transverse branch air ducts are adjusted according to the characteristics of the graphite material, the hot air flow is controlled, then the drying furnace is started, the hot air is blown to the graphite material from the transverse branch air ducts at the adjusted flow, drying is performed, and the opening degrees of the air valves can be adjusted again according to the actual situation during the drying process.

[0053] Further, in the above technical solution, the longitudinal circulating air duct 30 comprises a longitudinal main air duct and a plurality of longitudinal branch air ducts, the longitudinal main air duct is arranged at the bottom of the drying furnace body 10, the plurality of longitudinal branch air ducts are spaced apart and communicated with the longitudinal main air duct, and the air outlets of the plurality of longitudinal branch air ducts all upwardly face the graphite material in the drying area.

[0054] When the longitudinal circulating air duct mode is selected, the graphite material is placed in the drying furnace, hot air enters from the longitudinal main air duct, and is blown upward to the graphite material through the interval distributed longitudinal branch air duct, and the operator can adjust the layout or quantity of the longitudinal branch air duct according to the height and shape of the graphite material accumulation, so as to ensure that the hot air fully penetrates the material layer and completes drying.

[0055] Further, in the above technical solution, the material rack 11 is located between the air outlet of the transverse circulating air duct 20 and the air outlet of the longitudinal circulating air duct 30, and is used for carrying the graphite material, the material rack 11 comprises a frame and a carrying net arranged in the frame, and the frame is slidably connected with the inner wall of the drying furnace body 10 through a sliding rail.

[0056] The operator first places the graphite material on the material rack, and then selects the appropriate air duct mode according to the material condition, starts the drying furnace, and blows hot air from the air outlet of the transverse circulating air duct or the longitudinal circulating air duct to dry the graphite material on the material rack, and then takes out the graphite from the material rack.

[0057] Specifically, the principle of the utility model is:

[0058] The core innovation of the utility model is that two modes of transverse circulating air duct and longitudinal circulating air duct are designed, and the mode is flexibly switched through an air duct switching device. The transverse circulating air duct is mainly used for the flat sheet-shaped high-purity graphite material, the transverse main air duct is arranged on one side of the drying area along the length direction of the drying furnace body, a plurality of transverse branch air ducts are connected to the main air duct at intervals, the branch air ducts are connected with the main air duct at an acute angle, and the air outlet is directed to the drying area. When the transverse circulating air duct mode is selected, hot air enters from the transverse main air duct, is smoothly divided into each branch air duct under the action of the acute angle connection, is uniformly blown to the surface of the graphite material, and water is quickly taken away by the horizontal flow of hot air. The longitudinal circulating air duct is suitable for the high-pile block-shaped high-purity graphite material, the longitudinal main air duct is laid at the bottom of the drying furnace, a plurality of longitudinal branch air ducts are connected at intervals, and the air outlet is vertically upward. In the longitudinal circulating air duct mode, hot air enters from the bottom main air duct, is blown upward through the branch air duct, penetrates the material layer, and realizes uniform drying from bottom to top. The switching valve body in the air duct switching device is installed at the intersection of the transverse circulating air duct and the longitudinal circulating air duct, the valve plate slides on the valve seat, and the mode is switched by plugging or conducting the corresponding air duct. When the transverse circulating air duct mode is needed, the valve plate slides to plug the longitudinal circulating air duct, so that the hot air flows along the transverse air duct; conversely, when the longitudinal circulating air duct mode is needed, the valve plate slides to plug the transverse circulating air duct, and the hot air flows along the longitudinal air duct, so as to realize the purpose of selecting the best drying mode according to the material characteristics;

[0059] In order to ensure that the hot air is uniformly distributed in the drying area and realize efficient heat exchange, the utility model is optimized in many aspects on the air duct structure. In the transverse circulating air duct, multiple transverse branch air ducts are connected in intervals and connected with the main air duct at an acute angle. This design helps the hot air to be more evenly distributed to each branch, and the adjustable opening air valve can accurately control the air volume of each branch air duct according to the actual situation of the high-purity graphite material, such as thickness, humidity, etc., to ensure that the hot air uniformly covers the surface of the material. The horn-shaped diffusion cover at the top of the longitudinal circulating air duct can evenly diffuse the hot air blown out from the branch air duct to the entire drying area, avoiding local high or low temperature. In addition, the inner wall of the air duct is designed with smooth transition, reducing the flow resistance and vortex of the hot air, so that the hot air can flow stably and uniformly in the air duct, ensuring that the hot air and the high-purity graphite material are in full contact, and improving the heat exchange efficiency. In the drying process, the hot air transfers heat to the high-purity graphite material, and the water in the material evaporates after absorbing heat and is carried away by the hot air, realizing efficient drying. Through reasonable design of the air duct structure and layout, the hot air forms a stable circulating flow in the drying area, continuously exchanges heat with the material, until the material reaches the specified drying degree.

Claims

1. A high-purity graphite drying furnace with a circulating air duct structure, characterized in that, The drying furnace body, the transverse circulating air duct, the longitudinal circulating air duct and the air duct switching device; the transverse circulating air duct and the longitudinal circulating air duct are arranged in the drying furnace body, and the air duct switching device is used for controlling the on-off of the transverse circulating air duct and the longitudinal circulating air duct; the air outlet of the transverse circulating air duct is arranged opposite to one side wall of the drying area, and is used for blowing hot air horizontally to the graphite material in the drying area; the air outlet of the longitudinal circulating air duct is located at the bottom of the drying area, and is used for blowing hot air vertically upward to the graphite material in the drying area; and the drying furnace body is provided with a material rack.

2. The high purity graphite baking furnace with a circulating air duct structure according to claim 1, characterized in that, The air duct switching device comprises a switching valve body, a driving mechanism and a transmission assembly; the switching valve body is arranged at the intersection of the transverse circulating air duct and the longitudinal circulating air duct, and is used for blocking or conducting the air duct; the driving mechanism is arranged outside the drying furnace body, the transmission assembly is connected between the driving mechanism and the switching valve body, and is used for transmitting the power of the driving mechanism to the switching valve body to drive the switching valve body to act.

3. The high purity graphite baking furnace with circulating air duct structure according to claim 2, characterized in that, The switching valve body comprises a valve plate and a valve seat, the valve seat is fixedly installed on the inner wall of the air duct at the intersection of the transverse circulating air duct and the longitudinal circulating air duct, and the valve plate is in sliding fit with the valve seat and blocks the transverse circulating air duct or the longitudinal circulating air duct by sliding on the valve seat.

4. The high purity graphite baking furnace with a circulating air duct structure according to claim 3, characterized in that, The valve seat is in the form of a circular ring, the inner ring surface thereof is smoothly connected with the inner walls of the transverse circulating air duct and the longitudinal circulating air duct; the valve plate is in the form of a disc, the diameter of the valve plate is matched with the inner ring diameter of the valve seat, and a sealing rubber strip is arranged on the edge of the valve plate.

5. The high purity graphite baking furnace with a circulating air duct structure according to claim 4, characterized in that, The driving mechanism is a manual knob, the manual knob is rotatably installed on the outer side wall of the drying furnace body, the transmission assembly comprises a transmission shaft, one end of the transmission shaft is fixedly connected with the manual knob, and the other end of the transmission shaft penetrates through the side wall of the drying furnace body and is connected with the switching valve body.

6. The high purity graphite baking furnace with a circulating air duct structure according to claim 5, characterized in that, The transmission assembly comprises a linkage mechanism, the linkage mechanism comprises a plurality of links which are hingedly connected with each other, one end of the linkage mechanism is connected with the driving mechanism, and the other end of the linkage mechanism is connected with the switching valve body, so that the driving mechanism drives the switching valve body through linkage of the linkage mechanism.

7. The high purity graphite baking furnace with circulating air duct structure according to claim 6, characterized in that, The transverse circulating air duct comprises a transverse main air duct and a plurality of transverse branch air ducts, the transverse main air duct is arranged on one side of the drying area along the length direction of the drying furnace body, the plurality of transverse branch air ducts are spaced apart and communicated with the transverse main air duct, and the air outlets of the plurality of transverse branch air ducts are all directed to the graphite material in the drying area.

8. The high purity graphite baking furnace with a circulating air duct structure according to claim 7, characterized in that, The transverse branch air duct is connected with the transverse main air duct at an acute angle, and an air valve with adjustable opening degree is arranged on each transverse branch air duct.

9. The high purity graphite baking furnace with a circulating air duct structure according to claim 8, characterized in that, The longitudinal circulating air duct comprises a longitudinal main air duct and a plurality of longitudinal branch air ducts, the longitudinal main air duct is arranged at the bottom of the drying furnace body, the plurality of longitudinal branch air ducts are spaced apart and communicated with the longitudinal main air duct, and the air outlets of the plurality of longitudinal branch air ducts are all directed upward to the graphite material in the drying area.

10. The high purity graphite baking furnace with a circulating air duct structure according to claim 9, characterized in that, The material rack is located between the air outlet of the transverse circulating air duct and the air outlet of the longitudinal circulating air duct, and is used for carrying the graphite material, the material rack comprises a frame and a carrying net arranged in the frame, and the frame is in sliding connection with the inner wall of the drying furnace body through a sliding rail.

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