Vertical firing furnace

Abstract

The application discloses a vertical firing furnace and relates to the technical field of firing equipment.The vertical firing furnace comprises a workbench, a fixed plate is fixedly connected to the top of the workbench, a firing furnace body is fixedly connected to the side of the fixed plate, a layered heat insulation plate is fixedly connected to the inner wall of the firing furnace body, a lifting layered device is arranged at the bottom of the workbench, a reset heat dissipation device is arranged at the bottom of the workbench, and an evacuation device is arranged at the bottom of the workbench.The lifting layered device is arranged, so that when the vertical firing furnace is used for layered firing in different temperature zones, the motor can be directly used to drive the to-be-processed material to shift between the different temperature zones, the furnace body door does not need to be opened, and the material needs to be manually shifted, the manual shifting process can be avoided, a large amount of heat in the furnace can be prevented from being lost, the risk that a worker is burned by high temperature is reduced, the sealing of the bottom of the corresponding temperature zone is automatically completed in cooperation with the lifting action in the lifting process, the temperature in the temperature zone is ensured to be stable, and unnecessary heat loss is reduced.

Description

Technical Field

[0001] This invention relates to the field of firing equipment technology, specifically a vertical firing furnace. Background Technology

[0002] A vertical firing furnace is a type of thermal firing equipment with the furnace cavity set entirely in a vertical direction. It is commonly used for high-temperature firing of workpieces such as ceramics, refractory materials, and powder materials. Compared to horizontal firing furnaces, vertical firing furnaces occupy less horizontal space and are more convenient to divide firing temperature zones into different layers through a layered structure.

[0003] According to a public disclosure (publication number: CN207193185U), a vertical carbonization furnace for bamboo charcoal production includes a furnace body, a baffle, and a blower. The furnace body contains a carbonization chamber, with an inner bracket fixed to the right side of the chamber. Smoke holes are distributed on the smoke pipe. A feed inlet is located on the right side of the baffle, and a fixing plate is installed to the right of the feed inlet. The fixing plate has positioning holes, and a connecting rod is installed in the middle of the fixing plate. A locking cap is fixed to the outside of the connecting thread. A combustion chamber is connected to the right side of the air inlet, and a partition is installed above the combustion chamber with through holes. A fuel inlet is fixed to the right side of the combustion chamber. This vertical carbonization furnace for bamboo charcoal production features a fixing plate and a bracket, allowing bamboo poles to be directly inserted through the positioning holes during charcoal production. Gaps are left between the bamboo poles, ensuring more even heating. Compared to conventional carbonization furnaces, it offers faster feeding and unloading speeds, and is more comfortable and safer for workers.

[0004] In the aforementioned application, bamboo charcoal is processed by dividing it into different temperature zones through a layered structure. When multiple temperature zones are required for bamboo charcoal firing, operators often need to open the furnace door and manually transfer the bamboo charcoal to the next temperature zone. During the transfer process, a large amount of heat inside the furnace will quickly dissipate to the outside, which will not only cause a large amount of heat loss and increase energy consumption, but also cause significant fluctuations in the furnace temperature, affecting the final firing effect. At the same time, the overflow of high-temperature hot air can easily burn operators, posing a significant safety hazard. Therefore, a vertical firing furnace was proposed. Thus, we propose a vertical firing furnace. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a vertical firing furnace that solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a vertical firing furnace, including a workbench, a fixed plate fixedly connected to the top of the workbench, a firing furnace body fixedly connected to the side of the fixed plate, a layered heat insulation plate fixedly connected to the inner wall of the firing furnace body, a lifting and layering device provided at the bottom of the workbench, a resetting heat dissipation device provided at the bottom of the workbench, and a vacuum device provided at the bottom of the workbench.

[0007] The lifting and stratification device includes a motor, the output shaft of which is fixedly connected to a worm shaft. A lead screw is rotatably connected through the bottom of the worktable. A worm wheel is fixedly connected to the circumferential surface of the lead screw. A drive nut seat is threadedly connected to the circumferential surface of the lead screw. A moving plate is fixedly connected to the circumferential surface of the drive nut seat. An inner shaft is fixedly connected to the top of the moving plate. A placement plate is fixedly connected to the end of the inner shaft away from the moving plate. An outer bushing is provided on the top of the moving plate. A pressure-adjusting spring is fixedly connected to the top of the outer bushing. A lower sealing plate is fixedly connected to the end of the pressure-adjusting spring away from the outer bushing.

[0008] According to the above technical solution, a heat outlet is provided on the top of the firing furnace body, and a constant temperature firing rack is fixedly connected inside the firing furnace body. The constant temperature firing rack can separate the materials to be fired into different temperature zones. With the help of layered heat insulation plates, the interior of the firing furnace body is divided into different temperature zones to meet the temperature requirements of different materials or different firing stages of the same material, thereby improving the adaptability of firing. The heat outlet can discharge excess heat inside the firing furnace body after firing, avoiding excess heat remaining inside that may affect subsequent firing processes, and also reducing the overall operating temperature of the equipment.

[0009] According to the above technical solution, the inner wall of the outer bushing is slidably connected to the circumferential surface of the inner shaft. The bottom of the layered heat insulation plate is located on the displacement trajectory of the top of the placement plate, and the bottom of the firing furnace body is located on the displacement trajectory of the top of the lower sealing plate. When the placement plate moves to the bottom of the layered heat insulation plate and fits with it, it can seal the bottom of the temperature zone separated by the layered heat insulation plate, ensuring the temperature stability in the temperature zone and reducing heat loss. When the lower sealing plate moves to fit with the bottom of the firing furnace body, it can seal the bottom of the entire firing furnace body. At this time, the inner shaft can still slide relative to the outer bushing, so that materials that need to be fired at high and low temperatures or that need to be removed can first be raised to the upper constant temperature firing placement rack, or lowered from the upper constant temperature firing placement rack to the lower temperature zone.

[0010] According to the above technical solution, the worm gear part meshes with the worm shaft, and the number of the inner shaft, outer bushing and appropriate pressure spring are set in two sets, and they are symmetrical about each other along the vertical central axis of the moving plate. Their function is to ensure that the force is uniform during the lifting process and the lifting movement is more stable. At the same time, the meshing structure of the worm gear part and the worm shaft has a self-locking characteristic, which can automatically lock the position after the lifting is in place, without the need to add an additional locking mechanism.

[0011] According to the above technical solution, the reset and heat dissipation device includes a lower hydraulic cylinder, which is fixedly connected to the bottom of the workbench. A connecting pipe is fixedly passed through the cylinder body of the lower hydraulic cylinder, and an upper hydraulic cylinder is fixedly passed through the end of the connecting pipe away from the lower hydraulic cylinder. A reset plate is fixedly connected to the circumferential surface of the piston rod of the lower hydraulic cylinder, and a reset spring is fixedly connected between the bottom of the reset plate and the bottom of the lower hydraulic cylinder. A sealing cover plate is fixedly connected to the end of the piston rod of the upper hydraulic cylinder. The opening and closing of the sealing cover plate is controlled by the power linkage when the lifting and layering device moves, thereby achieving the effect of automatically sealing and opening the heat outlet port, and automatically opening to discharge heat after the firing furnace body is fired.

[0012] According to the above technical solution, a heat dissipation sleeve is fixedly connected to the circumferential surface of the connecting pipe, and the top of the heat outlet sleeve is located on the displacement trajectory of the bottom of the sealing cover plate, which avoids the hydraulic oil being at high temperature for a long time and affecting the operational stability of the device.

[0013] According to the above technical solution, the top of the lower hydraulic cylinder is located on the displacement trajectory of the bottom of the moving plate. The rodless chamber of the lower hydraulic cylinder is connected to the rodless chamber of the upper hydraulic cylinder through a connecting pipe. The excess heat accumulated in the firing furnace is discharged through the heat outlet, thereby reducing the temperature inside the firing furnace and facilitating the next batch of firing operations.

[0014] According to the above technical solution, the evacuation device includes a pump body, which is fixedly connected to the bottom of the workbench. A piston is slidably connected to the inner wall of the pump body, and a connecting rod is hinged to the side of the piston. A disc is hinged to the end of the connecting rod away from the piston. An air pipe is fixedly passed through the side of the pump body, and an electromagnetic control valve is provided on the side of the pump body. This can create a vacuum inside the firing furnace, meeting the requirements for firing some materials in a vacuum environment. It eliminates the need for an additional power mechanism for evacuation, resulting in a more compact structure and reduced overall equipment cost.

[0015] According to the above technical solution, a pressure relief valve is provided on the circumferential surface of the gas pipe, and the interior of the pump body is connected to the interior of the firing furnace body through the gas pipe. Its function is to slowly and steadily release pressure when the vacuum state needs to be broken after firing, so as to avoid the rapid influx of outside air and its impact on the fired material, thus ensuring the integrity of the finished product.

[0016] According to the above technical solution, the side of the disc is fixedly connected to the end of the worm shaft away from the motor. Its function is to extract the air inside the firing furnace. While meeting the requirements of vacuum firing, no additional drive device is needed, making full use of the power of the original power mechanism.

[0017] This invention provides a vertical firing furnace. It has the following beneficial effects: (1) By setting up a lifting and layering device, the vertical firing furnace can directly drive the material to be processed to be transferred between different temperature zones when it is firing in different temperature zones. There is no need to open the furnace door to manually transfer the material, which avoids a large amount of heat loss in the furnace during manual transfer and also reduces the risk of workers being burned by high temperature. At the same time, the lifting action automatically completes the sealing of the bottom of the corresponding temperature zone, ensuring the temperature stability in the temperature zone and reducing unnecessary heat loss.

[0018] (2) By setting up a reset heat dissipation device, the present invention enables the vertical firing furnace to automatically push the hydraulic oil in the lower hydraulic cylinder to flow when the lifting and layering device drives the moving plate to descend and reset after the firing operation is completed. This pushes the sealing cover to automatically rise and open the heat outlet, quickly dissipating the excess heat accumulated inside the firing furnace body. There is no need to manually open the sealing cover, reducing the burden of manual operation. At the same time, when the lifting and layering device is rising, the reset spring can drive the reset plate to reset, so that the sealing cover automatically descends and closes the heat outlet, ensuring the sealing of the firing furnace body during the firing process and reducing heat loss during the firing process.

[0019] (3) By setting up the evacuation device, the present invention enables the worm shaft to rotate synchronously while the lifting and stratification device completes the lifting operation by driving the motor to rotate the worm shaft. The worm shaft drives the fixedly connected disc to rotate synchronously. The disc drives the piston to reciprocate in the pump body through the connecting rod, continuously extracting the air inside the firing furnace through the air pipe, pump body and electromagnetic control valve, automatically completing the evacuation operation inside the firing furnace. There is no need to add an independent evacuation drive mechanism. It makes full use of the power of the original lifting drive mechanism, the structure is more compact, and the overall manufacturing cost of the equipment is reduced. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional side view of the present invention; Figure 2 This is a schematic diagram of the internal structure of the three-dimensional firing furnace of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention in a three-dimensional partial side view; Figure 4 This is an enlarged structural schematic diagram of the three-dimensional worm gear section of the present invention; Figure 5This is an enlarged structural schematic diagram of the three-dimensional placement plate of the present invention; Figure 6 This is an enlarged structural schematic diagram of the three-dimensional resetting heat dissipation device of the present invention; Figure 7 This is an enlarged structural schematic diagram of the three-dimensional evacuation device of the present invention.

[0021] In the diagram: 1. Workbench; 2. Fixed plate; 3. Firing furnace body; 4. Layered heat insulation plate; 5. Lifting and layering device; 6. Reset heat dissipation device; 7. Vacuuming device; 8. Heat outlet sleeve; 9. Constant temperature firing placement rack; 501. Motor; 502. Worm shaft; 503. Lead screw; 504. Worm wheel section; 505. Drive nut seat; 506. Moving plate; 507. Inner shaft; 508. Placement plate; 509. Outer bushing; 510. Pressure spring; 511. Lower sealing plate; 601. Lower hydraulic cylinder; 602. Connecting pipe; 603. Upper hydraulic cylinder; 604. Reset plate; 605. Reset spring; 606. Sealing cover plate; 607. Heat dissipation sleeve; 701. Pump body; 702. Piston; 703. Connecting rod; 704. Disc; 705. Gas pipe; 706. Electromagnetic control valve; 707. Pressure relief valve. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Please see Figure 1-7 One embodiment of the present invention is: a vertical firing furnace, including a workbench 1, a fixing plate 2 fixedly connected to the top of the workbench 1, a firing furnace body 3 fixedly connected to the side of the fixing plate 2, a layered heat insulation plate 4 fixedly connected to the inner wall of the firing furnace body 3, a lifting and layering device 5 provided at the bottom of the workbench 1, a resetting heat dissipation device 6 provided at the bottom of the workbench 1, and a vacuuming device 7 provided at the bottom of the workbench 1.

[0024] The lifting and stratification device 5 includes a motor 501. The output shaft of the motor 501 is fixedly connected to a worm shaft 502. A lead screw 503 is rotatably connected through the bottom of the worktable 1. A worm wheel portion 504 is fixedly connected to the circumferential surface of the lead screw 503. A drive nut seat 505 is threadedly connected to the circumferential surface of the drive nut seat 505. A moving plate 506 is fixedly connected to the circumferential surface of the moving plate 506. An inner shaft 507 is fixedly connected to the top of the moving plate 506. A placement plate 508 is fixedly connected to the end of the inner shaft 507 away from the moving plate 506. An outer bushing 509 is provided on the top of the moving plate 506. A pressure spring 510 is fixedly connected to the top of the outer bushing 509. A lower sealing plate 511 is fixedly connected to the end of the pressure spring 510 away from the outer bushing 509.

[0025] The top of the firing furnace body 3 is equipped with a heat outlet 8, and a constant temperature firing rack 9 is fixedly connected inside the firing furnace body 3. The constant temperature firing rack 9 can separate the materials to be fired into different temperature zones. Together with the layered heat insulation plate 4, the interior of the firing furnace body 3 is divided into different temperature zones to meet the temperature requirements of different materials or different firing stages of the same material, thereby improving the adaptability of firing. The heat outlet 8 can discharge the excess heat inside the firing furnace body 3 after firing, avoiding the retention of excess heat inside and affecting the subsequent firing process. At the same time, it can also reduce the overall operating temperature of the equipment.

[0026] The inner wall of the outer bushing 509 is slidably connected to the circumferential surface of the inner shaft 507. The bottom of the layered heat insulation plate 4 is located on the displacement trajectory of the top of the placement plate 508, and the bottom of the firing furnace body 3 is located on the displacement trajectory of the top of the lower sealing plate 511. When the placement plate 508 moves to the bottom of the layered heat insulation plate 4 and fits against it, it can seal the bottom of the temperature zone separated by the layered heat insulation plate 4, ensuring the temperature stability in the temperature zone and reducing heat loss. When the lower sealing plate 511 moves to fit against the bottom of the firing furnace body 3, it can seal the bottom of the entire firing furnace body 3. At this time, the inner shaft 507 can still slide relative to the outer bushing 509, so that materials that need to be fired at high and low temperatures or that need to be removed can first rise to the upper constant temperature firing placement rack 9, or descend from the upper constant temperature firing placement rack 9 to the lower temperature zone.

[0027] The worm gear 504 meshes with the worm shaft 502. There are two sets of inner shaft 507, outer bushing 509 and pressure spring 510, which are symmetrical about each other along the vertical central axis of the moving plate 506. Their function is to ensure that the force is uniform during the lifting process and the lifting movement is more stable. At the same time, the meshing structure between the worm gear 504 and the worm shaft 502 has a self-locking characteristic, which can automatically lock the position after the lifting is in place, without the need for an additional locking mechanism.

[0028] In use, the construction personnel determine the products to be fired and fix them on the placement plate 508. Then, the products that do not need to be fired are placed on the constant temperature firing rack 9. At this time, the lid of the firing furnace body 3 is closed, and the internal heating components of the firing furnace body 3 are started. Simultaneously, the motor 501 is started, driving the worm shaft 502 connected to the output shaft of the motor 501 to rotate. The worm shaft 502 engages and drives the worm wheel 504, which in turn drives the lead screw 503 to rotate at the bottom of the worktable 1. When the lead screw 503 rotates, it drives the threaded drive nut seat 505 to move upward along the lead screw 503. The drive nut seat 505 drives the moving plate 506 to move upward as a whole. As the moving plate 506 rises, the lower sealing plate 511 will first contact the bottom of the firing furnace body 3. As the moving plate 506 continues to move upward, the pressure spring 510 is compressed and pushes the lower sealing plate 511 to press tightly against the bottom of the firing furnace body 3, completing the sealing of the entire bottom of the firing furnace body 3. After that, the placement plate 508 will drive the products to be fired. The material continues to move upwards, feeding it into the corresponding temperature zone separated by the layered insulation plate 4, until the placement plate 508 is tightly attached to the bottom of the layered insulation plate 4, sealing the bottom of the temperature zone and ensuring that the temperature within the zone meets the firing requirements, thus achieving layered constant-temperature firing. When low-temperature firing is required, simply control the motor 501 to rotate in the reverse direction, driving the moving plate 506 to move downwards as a whole. The placement plate 508 will first separate from the bottom of the layered insulation plate 4, and then continue to move downwards as the moving plate 506 continues to move downwards. However, because the pressure of the pressure spring 510 is still present, the lower sealing plate 511 remains tightly attached to the bottom of the firing furnace body 3, and will not immediately lose its sealing effect. The placement plate 508 simply moves the material downwards into the lower temperature zone, meeting the requirements of variable-temperature firing. When it is necessary to remove the material, the motor 501 continues to rotate in the reverse direction, driving the moving plate 506 downwards. After the lower sealing plate 511 separates from the bottom of the firing furnace body 3, the fired material can be removed, making it convenient to pick up and put away the material.

[0029] Please see Figure 1-7 Based on the above embodiments, in another embodiment of the present invention, the reset heat dissipation device 6 includes a lower hydraulic cylinder 601, which is fixedly connected to the bottom of the workbench 1. A connecting pipe 602 is fixedly passed through the cylinder body of the lower hydraulic cylinder 601. An upper hydraulic cylinder 603 is fixedly passed through the end of the connecting pipe 602 away from the lower hydraulic cylinder 601. A reset plate 604 is fixedly connected to the circumferential surface of the piston rod of the lower hydraulic cylinder 601. A reset spring 605 is fixedly connected between the bottom of the reset plate 604 and the bottom of the lower hydraulic cylinder 601. A sealing cover plate 606 is fixedly connected to the end of the piston rod of the upper hydraulic cylinder 603. The opening and closing of the sealing cover plate 606 is controlled by the power linkage when the lifting and layering device 5 moves, thereby achieving the effect of automatically sealing and opening the heat outlet port 8. After the firing of the furnace body 3 is completed, it automatically opens to discharge heat.

[0030] A heat dissipation sleeve 607 is fixedly connected to the circumferential surface of the connecting pipe 602. The top of the heat outlet 8 is located on the displacement trajectory of the bottom of the sealing cover plate 606, which prevents the hydraulic oil from being at high temperature for a long time and affecting the stability of the device operation.

[0031] The top of the lower hydraulic cylinder 601 is located on the displacement trajectory of the bottom of the moving plate 506. The rodless chamber of the lower hydraulic cylinder 601 is connected to the rodless chamber of the upper hydraulic cylinder 603 through the connecting pipe 602. The excess heat accumulated in the firing furnace body 3 is discharged through the heat outlet 8, which reduces the temperature inside the firing furnace body 3 and facilitates the next batch of firing operations.

[0032] The evacuation device 7 includes a pump body 701, which is fixedly connected to the bottom of the workbench 1. A piston 702 is slidably connected to the inner wall of the pump body 701. A connecting rod 703 is hinged to the side of the piston 702. A disc 704 is hinged to the end of the connecting rod 703 away from the piston 702. A gas pipe 705 is fixedly passed through the side of the pump body 701. An electromagnetic control valve 706 is provided on the side of the pump body 701, which can evacuate the inside of the firing furnace 3 into a vacuum, meeting the needs of firing some materials in a vacuum environment. No additional power mechanism is required for the evacuation operation, making the structure more compact and reducing the overall cost of the equipment.

[0033] A pressure relief valve 707 is provided on the circumferential surface of the gas pipe 705. The interior of the pump body 701 is connected to the interior of the firing furnace body 3 through the gas pipe 705. Its function is to slowly and steadily release pressure when the vacuum state needs to be broken after firing, so as to avoid the rapid influx of outside air and its impact on the fired material, thus ensuring the integrity of the finished product.

[0034] The side of the disc 704 is fixedly connected to the end of the worm shaft 502 away from the motor 501. Its function is to extract the air inside the firing furnace 3. While meeting the requirements of vacuum firing, no additional drive device is needed, making full use of the power of the original power mechanism.

[0035] In operation, when the operator starts the motor 501, the worm shaft 502 rotates, synchronously driving the disc 704 to rotate. The disc 704, through the connecting rod 703, pulls the piston 702 to slide back and forth on the inner wall of the pump body 701. When the piston 702 moves away from the disc 704, a negative pressure is formed inside the pump body 701, the electromagnetic control valve 706 closes, and air inside the firing furnace 3 is drawn into the pump body 701 through the air pipe 705. When the piston 702 moves closer to the disc 704, the air pressure inside the pump body 701 increases. The pipe on one side of the air pipe 705 is closed by pressure, the electromagnetic control valve 706 opens, and the air inside the pump body 701 is discharged to the outside through the electromagnetic control valve 706. As the disc 704 continues to rotate, this process is repeated continuously, continuously extracting air from the inside of the firing furnace 3 until a vacuum is reached. When firing is completed and it is necessary to break the vacuum, the pressure relief valve 707 is opened to slowly introduce air into the firing furnace 3 to achieve smooth pressure relief. When the moving plate 506 moves the material downwards in preparation for discharge, the moving plate 506 will... The downward movement of the piston rod of the lower hydraulic cylinder 601 causes the reset plate 604 to move downward, thereby compressing the hydraulic oil in the rodless chamber of the lower hydraulic cylinder 601. The hydraulic oil flows into the rodless chamber of the upper hydraulic cylinder 603 through the connecting pipe 602, pushing the piston rod of the upper hydraulic cylinder 603 upward. This causes the sealing cover plate 606 to lift upward, opening the heat outlet 8. After firing, the high-temperature hot air will be discharged through the heat outlet 8. The heat dissipation sleeve 607 can also simultaneously dissipate heat from the hydraulic oil in the connecting pipe 602, preventing... Excessive hydraulic oil temperature affects the operation of the device. When the lifting and stratification device 5 moves the moving plate 506 upward, the moving plate 506 no longer presses the piston rod of the lower hydraulic cylinder 601. The reset spring 605 pushes the reset plate 604 to reset, the pressure in the rodless chamber of the lower hydraulic cylinder 601 decreases, and the hydraulic oil in the rodless chamber of the upper hydraulic cylinder 603 flows back, driving the sealing cover plate 606 to reset downward, resealing the heat outlet port 8, ensuring the internal temperature of the furnace is stable during the firing process, eliminating the need for manual opening and closing of the heat outlet port 8, and realizing automatic control of heat dissipation during material discharge.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vertical firing furnace, comprising a workbench (1), characterized in that: The top of the workbench (1) is fixedly connected to a fixing plate (2), the side of the fixing plate (2) is fixedly connected to a firing furnace body (3), the inner wall of the firing furnace body (3) is fixedly connected to a layered heat insulation plate (4), the bottom of the workbench (1) is provided with a lifting and layering device (5), the bottom of the workbench (1) is provided with a reset heat dissipation device (6), and the bottom of the workbench (1) is provided with a vacuum device (7). The lifting and stratification device (5) includes a motor (501), the output shaft of the motor (501) is fixedly connected to a worm shaft (502), the bottom of the worktable (1) is rotatably connected to a lead screw (503), the circumferential surface of the lead screw (503) is fixedly connected to a worm wheel (504), the circumferential surface of the lead screw (503) is threadedly connected to a drive nut seat (505), the circumferential surface of the drive nut seat (505) is fixedly connected to a moving plate (506), the top of the moving plate (506) is fixedly connected to an inner shaft (507), the end of the inner shaft (507) away from the moving plate (506) is fixedly connected to a placement plate (508), the top of the moving plate (506) is provided with an outer bushing (509), the top of the outer bushing (509) is fixedly connected to a pressure spring (510), the end of the pressure spring (510) away from the outer bushing (509) is fixedly connected to a lower sealing plate (511).

2. A vertical firing furnace according to claim 1, characterized in that: The top of the firing furnace body (3) is provided with a heat outlet (8), and a constant temperature firing rack (9) is fixedly connected inside the firing furnace body (3).

3. A vertical firing furnace according to claim 2, characterized in that: The inner wall of the outer bushing (509) is slidably connected to the circumferential surface of the inner shaft (507), the bottom of the layered heat insulation plate (4) is located on the displacement trajectory of the top of the placement plate (508), and the bottom of the firing furnace body (3) is located on the displacement trajectory of the top of the lower sealing plate (511).

4. A vertical firing furnace according to claim 3, characterized in that: The worm gear (504) meshes with the worm shaft (502), and the inner shaft (507), outer bushing (509) and pressure spring (510) are provided in two sets, and are symmetrical to each other along the vertical central axis of the moving plate (506).

5. A vertical firing furnace according to claim 4, characterized in that: The reset and heat dissipation device (6) includes a lower hydraulic cylinder (601), which is fixedly connected to the bottom of the workbench (1). A connecting pipe (602) is fixedly passed through the cylinder body of the lower hydraulic cylinder (601). An upper hydraulic cylinder (603) is fixedly passed through the end of the connecting pipe (602) away from the lower hydraulic cylinder (601). A reset plate (604) is fixedly connected to the circumferential surface of the piston rod of the lower hydraulic cylinder (601). A reset spring (605) is fixedly connected between the bottom of the reset plate (604) and the bottom of the lower hydraulic cylinder (601). A sealing cover plate (606) is fixedly connected to the end of the piston rod of the upper hydraulic cylinder (603).

6. A vertical firing furnace according to claim 5, characterized in that: The circumferential surface of the connecting pipe (602) is fixedly connected to a heat dissipation sleeve (607), and the top of the heat outlet sleeve (8) is located on the displacement trajectory of the bottom of the sealing cover plate (606).

7. A vertical firing furnace according to claim 6, characterized in that: The top of the lower hydraulic cylinder (601) is located on the displacement trajectory of the bottom of the moving plate (506), and the rodless chamber of the lower hydraulic cylinder (601) is connected to the rodless chamber of the upper hydraulic cylinder (603) through a connecting pipe (602).

8. A vertical firing furnace according to claim 7, characterized in that: The evacuation device (7) includes a pump body (701), which is fixedly connected to the bottom of the workbench (1). A piston (702) is slidably connected to the inner wall of the pump body (701). A connecting rod (703) is hinged to the side of the piston (702). A disc (704) is hinged to the end of the connecting rod (703) away from the piston (702). An air pipe (705) is fixedly passed through the side of the pump body (701). An electromagnetic control valve (706) is provided on the side of the pump body (701).

9. A vertical firing furnace according to claim 8, characterized in that: The gas pipe (705) is provided with a pressure relief valve (707) on its circumferential surface, and the interior of the pump body (701) is connected to the interior of the firing furnace body (3) through the gas pipe (705).

10. A vertical firing furnace according to claim 9, characterized in that: The side of the disk (704) is fixedly connected to the end of the worm shaft (502) away from the motor (501).

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