A graphite furnace spray cooling device

Abstract

This invention relates to the field of graphitization furnace cooling technology, specifically to a graphitization furnace spray cooling device, comprising a pipe support. Multiple sets of adjacent spray pipes and misting pipes are installed on the upper end of the pipe support. The spray pipes are connected to the outlet of a first branch pipe via connecting pipes, and the misting pipes are connected to the outlet of a second branch pipe via another connecting pipe. A branch shell is installed on one side of the pipe support. The inlets of the first and second branch pipes are respectively connected to spray water inlets and misting water inlets on the branch shell. A lower valve plate is slidably disposed inside the branch shell, and an upper valve plate is fixedly connected to the lower valve plate via a connecting rod. This invention, by integrating closed-loop temperature control feedback and cylinder-driven dual-mode switching with a mechanical indicating mechanism, achieves an organic combination of automatic and precise temperature control based on furnace surface temperature and on-site manual intervention. While ensuring efficient and uniform cooling and safety, it significantly reduces reliance on manual labor and improves the intelligence level of the cooling process.

Description

Technical Field

[0001] This invention relates to the field of graphitization furnace cooling technology, and more specifically to a graphitization furnace spray cooling device. Background Technology

[0002] After the high-temperature graphitization process is completed, the furnace body and insulation layer still accumulate a large amount of residual heat. The temperature needs to be reduced to a safe range by a cooling device before subsequent material discharge or maintenance can be carried out. Currently, the cooling methods commonly used in the industry mainly include natural cooling, manual hand-held water spraying, and fixed frame spraying or misting. Natural cooling has a long cycle, which seriously affects production efficiency. Although manual hand-held water spraying is more flexible, it is labor-intensive and unsafe. While fixed frame spraying or misting reduces the physical burden to some extent, operators still need to manually start and stop the water pump and adjust the valve opening based on experience, resulting in a low overall level of automation.

[0003] However, traditional fixed cooling methods lack real-time sensing of furnace surface temperature and rigid feedback mechanisms for flow channel status. When operators decide when to switch between spray or mist modes or shut off the water supply, they can only rely on visual observation of furnace surface color changes or point measurement data from infrared thermometers. This discrete temperature acquisition method has a natural information gap with the continuously changing heat field distribution, causing control commands to always lag behind the actual thermal state. More importantly, when valves fail to reach the predetermined opening due to scale buildup or wear of the actuator, there is no mechanical position verification method within the system. Operators cannot confirm the actual on / off ratio of the flow channel from the outside, causing the seemingly normal water supply flow to deviate from the preset operating conditions. This "control blind spot" accumulates into a difficult-to-trace cooling consistency deviation during long-term operation. Even the introduction of conventional electrical sensors cannot fundamentally eliminate the hidden safety risks caused by the superposition of mechanical inaccuracies and information gaps. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention solves the problem that the existing fixed cooling method lacks real-time sensing of furnace surface temperature and rigid feedback of flow channel status, which leads to control lag, valve mechanical inaccuracy that cannot be externally verified, and thus causes temperature uniformity deviation and hidden safety risks.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a spray cooling device for a graphitization furnace, comprising a pipe support. Multiple sets of adjacent spray pipes and misting pipes are installed on the upper end of the pipe support. The spray pipes are connected to the outlet of a first diversion pipe via connecting pipes, and the misting pipes are connected to the outlet of a second diversion pipe via another connecting pipe. A diversion shell is installed on one side of the pipe support. The inlets of the first and second diversion pipes are respectively connected to a spray water inlet and a misting water inlet on the diversion shell. A lower valve plate is slidably disposed inside the diversion shell. An upper valve plate is fixedly connected to the lower valve plate via a connecting rod. The upper valve plate passes through a sliding hole at the upper end of the diversion shell and extends to the outside of the shell, thus diverting water... A groove is provided at the bottom of the shell, and a sealing plate is slidably installed in the groove. The lower side of the lower valve plate is in close contact with the upper side of the sealing plate. When the lower valve plate is in the low position, it seals the spray water inlet, while the upper valve plate is located outside the diverter shell, allowing the spray water inlet to open and realizing the spray mode. When the lower valve plate moves upward to the high position, it seals the spray water inlet and exposes the spray water inlet, realizing the spray mode. When the lower valve plate continues to move downward and pushes the sealing plate to the bottom limit position of the groove, the lower valve plate and the upper valve plate work together to block half of the spray water inlet and the spray water inlet respectively, allowing the two water flows to partially connect and realizing the mixed cooling mode of spray and mist.

[0007] Furthermore, a spring is provided at the bottom of the chute, with both ends of the spring abutting against the bottom wall of the chute and the lower side of the sealing plate, respectively, to provide an upward restoring force for the sealing plate.

[0008] Furthermore, a U-shaped frame is fixedly installed on the outside of the diverter housing, and a cylinder is installed on the U-shaped frame. The piston rod end of the cylinder is connected to the upper side of the upper valve plate, which is used to drive the upper valve plate and the lower valve plate to move up and down.

[0009] Furthermore, one side of the sealing plate extends outward through a vertical groove opened in the side wall of the diversion shell and is fixedly connected to a hollow plate with a hollow structure. The inner side of the hollow plate slides against the outer wall of the diversion shell.

[0010] Furthermore, a connecting plate is fixedly connected to the upper side of the upper valve plate, and a rack is fixedly connected to the lower end of the connecting plate. The rack meshes with a gear rotatably mounted on the side wall of the flow divider housing. An indicator housing is mounted on the side wall of the flow divider housing via a fixed rod. The shaft of the gear passes through the indicator housing and is fixedly connected to the indicator needle. The gear is rotatably connected to the indicator housing, causing the indicator needle to deflect synchronously with the displacement of the lower valve plate.

[0011] Furthermore, a protrusion is provided on one side of the rack, the protrusion is slidably disposed inside the hollow plate, and in the spray mode the protrusion is located at the bottom limit position of the hollow plate.

[0012] Furthermore, the indicator housing is provided with three sets of indicator marks, located at the 12 o'clock, 3 o'clock and 9 o'clock positions respectively, corresponding to the spray mode, mist mode and mixed cooling mode respectively. When the indicator needle points to the corresponding mark, it indicates that the current device is in the corresponding cooling working state.

[0013] Furthermore, when the upper valve plate descends to the mixing and cooling position that covers half of the spray water inlet, its upper end still extends to the outside of the diversion shell and maintains a seal on the sliding hole.

[0014] Furthermore, the inlet of the diversion shell is connected to the outlet of the water supply pipe, and the inlet of the water supply pipe is connected to the external water source via a booster pump and a filter in sequence. An electric regulating valve is also installed on the water supply pipe.

[0015] Furthermore, both the booster pump and the electric regulating valve are controlled by the controller, and a temperature sensor is installed on the top of the graphitization furnace. The temperature sensor is connected to the controller to achieve automatic start-up and shutdown and flow regulation based on the furnace surface temperature.

[0016] Beneficial effects

[0017] 1. The technical solution provided by this invention, by integrating a temperature sensor, controller, and electric regulating valve, constructs a closed-loop feedback control mechanism based on the real-time temperature of the furnace surface. This effectively solves the drawbacks of traditional cooling devices, which rely on a single mode and manual experience for adjustment. The system can automatically start and stop the booster pump and precisely adjust the water supply flow and spray or misting duration based on the detected surface temperature of the furnace top insulation layer. This ensures efficient and uniform cooling while avoiding the safety hazards of overcooling or insufficient cooling. At the same time, combined with a cylinder-driven dual-mode switching mechanism and mechanical indicator components, operators can achieve precise temperature control through automated programs or visually confirm the current working mode and make manual interventions on-site. This reduces the frequency of manual inspections and operational intensity, and improves the intelligence level and operational safety of the graphitization furnace cooling process.

[0018] 2. This device adopts a flow-dividing shell structure with the upper valve plate, lower valve plate, and sealing plate working in tandem. It can sequentially achieve three flow channel states—fully open spray, fully open mist spray, and dual-path half-open—through the linear reciprocating motion of a single cylinder. There is no need to configure independent actuators or complex reversing valve groups for each mode, which greatly simplifies the size and maintenance cost of the water circuit switching mechanism. At the same time, the purely mechanical position feedback system composed of rack, pinion, and pointer verifies with the protrusion limiting structure inside the hollow plate, so that the actual opening degree of the valve plate forms a rigid correspondence with the external indicator mark. Even under extreme conditions of electrical signal interference or sensor failure, on-site personnel can still accurately judge the flow channel opening and closing status by means of mechanical indication, providing a reliable physical redundancy verification means for automatic control and enhancing the long-term operational stability of the system in high-temperature and dusty environments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the pipe support structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the flow divider shell structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the sealed state of the spray water inlet of the present invention;

[0024] Figure 5 This is a schematic diagram of the spray water inlet and the sprinkler water inlet in a semi-sealed state according to the present invention;

[0025] Figure 6 This is a schematic diagram of the gear and rack meshing state of the present invention;

[0026] Figure 7 This is a schematic diagram of the spray pipe and misting pipe structure of the present invention;

[0027] Figure 8 This is a functional block diagram of the control system of the present invention.

[0028] Reference numerals: 1. Pipe support; 2. Sprinkler pipe; 3. Spray pipe; 4. First branch pipe; 5. Second branch pipe; 6. Branch shell; 7. Water supply pipe; 8. Electric regulating valve; 9. Booster pump; 10. Filter; 11. Main water supply pipe; 12. Controller; 13. Temperature sensor; 14. Sprinkler water inlet; 15. Spray water inlet; 16. Connecting rod; 17. Lower valve plate; 18. Upper valve plate; 19. U-shaped frame; 20. Cylinder; 21. Sliding hole; 22. Connecting plate; 23. Rack; 231. Protrusion; 24. Slide groove; 25. Sealing plate; 26. Spring; 27. Hollow plate; 28. Gear; 29. ​​Indicator needle; 30. Indicator shell; 31. Indicator mark. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] The present invention will be further described below with reference to embodiments.

[0031] See attached document Figures 1 to 8 A graphitization furnace spray cooling device is proposed to solve the technical problems of existing fixed cooling devices, such as single mode, lack of real-time temperature control feedback and low accuracy of water volume and duration control. The device achieves precise switching and adaptive adjustment of three modes: spray, mist and mixed cooling, through the coordinated cooperation of mechanical multi-station diversion structure and closed-loop temperature control system. The following describes the structural composition, operation process and technical effect of the device in detail with respect to each functional module.

[0032] like Figure 1 As shown, the water supply pipeline system serves as the carrier for transporting the cooling medium. Its main water supply pipe 11 is connected in sequence to the filter 10, the booster pump 9, and the electric regulating valve 8 before being connected to the inlet of the diversion shell 6. The filter 10 is used to intercept particulate impurities in the water source to prevent subsequent valve plates from jamming or nozzles from clogging.

[0033] The booster pump 9 provides a stable pressure source for the system. The electric regulating valve 8 is installed on the water supply pipe 7 and is used to receive the signal from the controller 12 to linearly regulate the water flow rate entering the distribution shell 6. This pipeline layout ensures that stable water pressure and controllable flow rate can be obtained in different cooling modes, providing reliable fluid dynamic conditions for subsequent precise temperature control.

[0034] The dual-mode nozzle assembly and the flow-diverting housing 6 structure constitute the core unit for cooling execution. (Reference) Figure 7 The upper end of the pipe support 1 is equipped with multiple sets of adjacent spray pipes 2 and mist pipes 3. The outlet of the spray pipe 2 is configured as a large-diameter direct nozzle, which is used to output water column or water curtain in spray mode to quickly remove surface heat. The outlet of the mist pipe 3 is configured as an atomizing nozzle, which is used to output fine water mist in mist mode to achieve uniform and slow cooling by using the principle of evaporation heat absorption.

[0035] refer to Figures 2 to 5 To enable independent or coordinated flow of the two water streams, a precise mechanical distribution channel is constructed inside the diversion shell 6: the side wall of the diversion shell 6 is provided with a spray water inlet 14 and a mist water inlet 15, which are respectively connected to the first diversion pipe 4 and the second diversion pipe 5, and then connected to the spray pipe 2 and the mist pipe 3 respectively.

[0036] refer to Figure 4 The lower valve plate 17 is slidably disposed inside the diversion housing 6. The lower valve plate 17 is fixedly connected to the upper valve plate 18 through the connecting rod 16 to form an integrated valve core assembly. The upper valve plate 18 extends through the sliding hole 21 at the top of the diversion housing 6 to the outside of the housing. In any working position, its upper end always covers the sliding hole 21 to keep the housing sealed and prevent high-pressure water from leaking out. The bottom of the diversion housing 6 is provided with a sliding groove 24. A sealing plate 25 is slidably disposed in the sliding groove 24. A spring 26 is provided at the bottom of the sliding groove 24 to abut against the lower side of the sealing plate 25, so that it always maintains an upward reset tendency. The lower side of the lower valve plate 17 and the upper side of the sealing plate 25 are precisely fitted to form a dynamic sealing pair to ensure the reliability of water path isolation during the switching of various modes.

[0037] The mode switching mechanism adopts a combination of cylinder 20 drive and mechanical limit to ensure accurate positioning of the three cooling states. A U-shaped frame 19 is fixed on the outside of the split shell 6, and the piston rod of the cylinder 20 installed on it is connected to the upper valve plate 18, serving as the sole power source to drive the valve core assembly to rise and fall.

[0038] refer to Figure 4 In spray mode, cylinder 20 drives valve core assembly to move down to low position. At this time, lower valve plate 17 completely blocks spray water inlet 15, while upper valve plate 18 is located in the high position outside the diversion shell 6, so that spray water inlet 14 is fully open. Water flows out only through spray pipe 2, which is suitable for rapid coarse cooling stage when the furnace temperature is high. The protrusion 231 on the side of rack 23 falls exactly into the bottom limit position of hollow plate 27. At this time, lower valve plate 17 is in contact with sealing plate 25 but no downward pressure is applied to sealing plate 25.

[0039] In spray mode, cylinder 20 drives valve core assembly to move up to the high limit, lower valve plate 17 moves up and completely blocks spray water inlet 14, while opening up spray water inlet 15. Water flows out only through spray pipe 3 and is atomized. This is suitable for fine and uniform cooling stage when furnace temperature is close to the target value. At this time, sealing plate 25 always seals slide groove 24 under the elasticity of spring 26 to prevent water from entering slide groove 24.

[0040] refer to Figure 5 In the mixed cooling mode, when both cooling rate and uniformity need to be considered, the cylinder 20 drives the valve core assembly to continue moving downward to a specific position. The lower valve plate 17 presses the sealing plate 25 to overcome the elastic force of the spring 26 and descend to the bottom limit of the slide groove 24. At this time, the relative position of the lower valve plate 17 and the upper valve plate 18 makes them respectively block half of the area of ​​the spray water inlet 15 and the spray water inlet 14. The two water flows are in a semi-open state and are simultaneously connected. The presence of the spring 26 not only provides the restoring force for the sealing plate 25, but also acts as a buffer element to absorb the impact when the valve plate is in place, ensuring the stability of the mixing ratio.

[0041] The mechanical position feedback and indication system is designed to solve the problem of misjudgment of status caused by the easy failure of electrical sensors in high temperature and dust environment. The upper valve plate 18 is fixed with a connecting plate 22, and the lower end of the connecting plate 22 is fixed with a rack 23. The rack 23 meshes with a gear 28 rotatably installed on the side wall of the diverter housing 6. The shaft of the gear 28 passes through the indicator housing 30 and is fixedly connected to the indicator needle 29.

[0042] When the valve core assembly is displaced under the drive of the cylinder 20, the rack 23 moves accordingly and drives the gear 28 to rotate, thereby causing the indicator needle 29 to deflect synchronously. The panel of the indicator housing 30 is provided with three sets of indicator marks 31, located at the 12 o'clock, 3 o'clock and 9 o'clock positions respectively, corresponding to the spray mode, mixed cooling mode and spray mode respectively.

[0043] This design converts the linear displacement inside the valve plate into an externally visible angular signal. Operators can directly confirm the actual on / off state of the flow channel on-site without disassembling the equipment or relying on electrical signals. This provides reliable physical redundancy verification for automatic control and effectively avoids "control blind spots" caused by valve jamming or actuator wear. The specific action logic is as follows:

[0044] When the lower valve plate 17 is in the low position and seals the spray water inlet 15, the spray water inlet 14 is opened, and the device enters the spray mode. At this time, the rack 23 drives the gear 28 to rotate, causing the indicator needle 29 to point to the indicator mark 31 at the 12 o'clock position. When it is necessary to switch to the mixed cooling mode, the lower valve plate 17 continues to move downward, pushing the sealing plate 25 down to the bottom of the slide groove 24 and squeezing the spring 26. During this process, the upper valve plate 18 drives the rack 23 to descend synchronously. The protrusion 231 on the side of the rack 23 pushes the hollow plate 27 downward, thereby driving the sealing plate 25 down, ensuring that the lower valve plate 17 and the upper valve plate 18 form a semi-blocking state for the spray water inlet 15 and the spray water inlet 14 respectively, so that the two water flows can be conducted simultaneously. At the same time, the downward movement of the rack 23 drives the gear 28 to rotate, so that the indicator needle 29 accurately points to the indicator mark 31 at the 3 o'clock position, indicating that the current mixed cooling mode is in effect.

[0045] When it is necessary to switch to spray mode, the valve core assembly moves upward, the lower valve plate 17 seals the spray water inlet 14 and exposes the spray water inlet 15. At this time, the rack 23 moves upward with the upper valve plate 18, and the protrusion 231 slides upward in the hollow plate 27 without generating additional thrust. The indicator needle 29 is driven to rotate to the indicator mark 31 at the 9 o'clock position through the meshing of the rack 23 and the gear 28, clearly indicating that the current device is in spray cooling state.

[0046] refer to Figure 8The intelligent detection and closed-loop control system realizes adaptive adjustment based on furnace surface temperature. The detection system includes a temperature sensor 13 installed on the surface of the insulation layer on the top of the graphitization furnace, which is used to collect the furnace surface temperature in real time and transmit it to the controller 12 (PLC or microcontroller). The controller 12 has a built-in flow and duration control module, and the parameter setting permissions can be opened through the human-machine interface or DIP switch.

[0047] When the system is running, the controller 12 executes a closed-loop strategy based on the real-time temperature value fed back by the temperature sensor 13: when the detected temperature is higher than the set upper limit, the booster pump 9 is automatically started and the electric regulating valve 8 is opened; when the temperature drops below the set lower limit, the booster pump 9 and the electric regulating valve 8 are automatically shut off to prevent the risk of overcooling.

[0048] During the cooling process, the controller 12 dynamically adjusts the opening of the electric regulating valve 8 according to the temperature change rate to achieve stepless adjustment of the water volume. At the same time, it can automatically trigger the cylinder 20 to act according to the preset program or real-time temperature difference, and intelligently switch between spray, mist and mixing modes to optimize the cooling curve.

[0049] In addition, if the position pointed to by the mechanical indicator needle 29 is inconsistent with the command mode issued by the controller 12, the system can immediately alarm and suspend operation to prevent cooling failure caused by mechanical jamming. Through the organic combination of the above structure and control, the reliability and observability of mechanical action under high temperature and harsh working conditions are guaranteed, and precise adaptive cooling based on real-time thermal status is realized, which improves the safety, consistency and automation level of graphitization furnace cooling operation.

[0050] Among them, spring 26 is made of high-temperature resistant and fatigue-resistant alloy spring steel and is shot-peened. Its structural parameters are precisely calculated and have sufficient safety margin to ensure that the working stress is always within the allowable range under high-frequency alternating loads, avoiding plastic deformation and fatigue failure. At the same time, spring 26 is completely enclosed inside the slide groove 24 and physically isolated from external dust and water vapor. Combined with the surface anti-corrosion coating and bottom drainage design, it effectively resists the risk of corrosion and jamming under harsh working conditions. In addition, the free length, stiffness coefficient and pre-compression of spring 26 have been matched and designed according to the maximum stroke of sealing plate 25 and the required sealing specific pressure in the mixed mode, ensuring that when the valve core assembly reaches the limit position of the mixed mode, spring 26 is still within the elastic working range, avoiding permanent deformation due to overpressure or sealing failure due to underpressure.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spray cooling device for a graphitization furnace, comprising a pipe support (1), characterized in that, The pipe support (1) is equipped with multiple sets of adjacent spray pipes (2) and spray pipes (3). The multiple sets of spray pipes (2) are connected to the outlet of the first diversion pipe (4) through connecting pipes. The multiple sets of spray pipes (3) are connected to the outlet of the second diversion pipe (5) through another connecting pipe. A diversion shell (6) is installed on one side of the pipe support (1). The inlets of the first diversion pipe (4) and the second diversion pipe (5) are respectively connected to the spray water inlet (14) and the spray water inlet (15) opened on the diversion shell (6). A lower valve plate (17) is slidably arranged inside the diversion shell (6). The lower valve plate (17) is fixedly connected to the upper valve plate (18) through the connecting rod (16). The upper valve plate (18) passes through the sliding hole (21) opened at the upper end of the diversion shell (6) and extends to the outside of the shell. A sliding groove (24) is opened at the bottom of the diversion shell (6). A sealing plate (25) is slidably installed inside the chute (24). The lower side of the lower valve plate (17) is in close contact with the upper side of the sealing plate (25). When the lower valve plate (17) is in a low position, it seals the spray water inlet (15). At the same time, the upper valve plate (18) is located outside the diversion shell (6), which opens the spray water inlet (14) to achieve the spray mode. When the lower valve plate (17) moves upward to a high position, it seals the spray water inlet (14) and exposes the spray water inlet (15) to achieve the spray mode. When the lower valve plate (17) continues to move downward and pushes the sealing plate (25) to the bottom limit position of the chute (24), the lower valve plate (17) and the upper valve plate (18) work together to cover half of the spray water inlet (15) and the spray water inlet (14) respectively, so that the two water flows are partially connected to achieve the mixed cooling mode of spray and mist.

2. The graphitization furnace spray cooling device according to claim 1, characterized in that, A spring (26) is provided at the bottom of the slide (24). The two ends of the spring (26) abut against the bottom wall of the slide (24) and the lower side of the sealing plate (25) respectively, and are used to provide an upward restoring force for the sealing plate (25).

3. The graphitization furnace spray cooling device according to claim 1, characterized in that, A U-shaped frame (19) is fixedly installed on the outside of the diversion shell (6). A cylinder (20) is installed on the U-shaped frame (19). The piston rod end of the cylinder (20) is connected to the upper side of the upper valve plate (18) to drive the upper valve plate (18) and the lower valve plate (17) to move up and down.

4. The graphitization furnace spray cooling device according to claim 1, characterized in that, The sealing plate (25) extends outward through a vertical groove opened on the side wall of the diversion shell (6) and is fixedly connected to a hollow plate (27) with a hollow structure. The inner side of the hollow plate (27) slides against the outer wall of the diversion shell (6).

5. The graphitization furnace spray cooling device according to claim 4, characterized in that, A connecting plate (22) is fixedly connected to the upper side of the upper valve plate (18), and a rack (23) is fixedly connected to the lower end of the connecting plate (22). The rack (23) meshes with a gear (28) rotatably mounted on the side wall of the diverter housing (6). An indicator housing (30) is installed on the side wall of the diverter housing (6) through a fixing rod. The shaft of the gear (28) passes through the indicator housing (30) and is fixedly connected to the indicator needle (29). The gear (28) is rotatably connected to the indicator housing (30), so that the indicator needle (29) deflects synchronously with the displacement of the lower valve plate (17).

6. The graphitization furnace spray cooling device according to claim 5, characterized in that, A protrusion (231) is provided on one side of the rack (23). The protrusion (231) is slidably disposed in the hollow plate (27), and in the spray mode, the protrusion (231) is located at the bottom limit position of the hollow plate (27).

7. The graphitization furnace spray cooling device according to claim 6, characterized in that, The indicator housing (30) is provided with three sets of indicator marks (31), located at the 12 o'clock, 3 o'clock and 9 o'clock positions respectively, corresponding to the spray mode, mist mode and mixed cooling mode in sequence. When the indicator needle (29) points to the corresponding mark, it indicates that the current device is in the corresponding cooling working state.

8. The graphitization furnace spray cooling device according to claim 1, characterized in that, When the upper valve plate (18) descends to the mixing and cooling position that covers half of the spray water inlet (14), its upper end still extends to the outside of the diversion shell (6) and maintains a seal on the sliding hole (21).

9. The graphitization furnace spray cooling device according to claim 1, characterized in that, The inlet of the diversion shell (6) is connected to the outlet of the water supply pipe (7). The inlet of the water supply pipe (7) is connected to the external water source via the booster pump (9), the filter (10) and the main water supply pipe (11). An electric regulating valve (8) is also installed on the water supply pipe (7).

10. A spray cooling device for a graphitization furnace according to claim 9, characterized in that, The booster pump (9) and the electric regulating valve (8) are both controlled by the controller (12), and a temperature sensor (13) is installed on the top of the graphitization furnace. The temperature sensor (13) is connected to the controller (12) to realize automatic start-up and shutdown and flow regulation based on the furnace surface temperature.

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