A photovoltaic furnace door with good heat insulation and sealing performance

Abstract

This invention relates to the field of photovoltaic furnace door technology, specifically a photovoltaic furnace door with good heat insulation and sealing performance. It includes a door body assembly, with a groove at the front end and a bearing groove at the rear end. Two first through holes are formed at the lower bottom of the groove, and a second through hole is formed at the upper bottom of the groove, located between the two first through holes. A round tube and two collar members are fixed to the side wall of the bearing groove near the groove. This application provides power to the operation of the components through a screw, enabling the moving plate assembly to operate quickly. This facilitates pressure application to the abutment ring and the collar member via a resistance spring, ensuring sufficient pressure on the collar member to push the abutment ring against the furnace body. Simultaneously, the cooperation of the sliding sleeve and positioning rod stably limits the moving plate within the moving plate assembly away from the fixed ring, ensuring effective pressure application to the collar member.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic furnace door technology, and in particular to a photovoltaic furnace door with good heat insulation and sealing performance. Background Technology

[0002] In actual production of silicon solar cells, P-type silicon wafers are used, requiring the formation of an N-type layer to achieve a PN junction. This is typically achieved through high-temperature diffusion using a phosphorus source. Liquid diffusion with phosphorus oxychloride (POCl3) is a common method. This involves using a protective gas, such as a constant-temperature liquid source bottle, to carry impurity source vapor into a high-temperature diffusion furnace. There, the impurity vapor undergoes thermal decomposition at high temperatures, reacting with the silicon wafer surface to reduce impurity atoms, which then diffuse into the wafer. During this reaction, POCl3 and oxygen undergo thermal decomposition at high temperatures to produce chlorine gas (Cl2), a highly toxic gas with a strong, pungent odor and asphyxiating properties. If the furnace is not properly sealed, the chlorine gas can diffuse into the environment, causing pollution and even poisoning of workers.

[0003] Traditional furnace bodies are typically sealed with rubber sealing rings. However, because the furnace body reaches temperatures exceeding 600 degrees Celsius after heating, the rubber is prone to expansion and deformation at high temperatures. After expansion, due to insufficient compressive force, gaps exist between the rubber sealing ring and the furnace body, reducing the sealing performance. The gas mixture inside the quartz tube can diffuse into the external environment through the connection gap. Since the gas mixture contains harmful Cl2 and unreacted POCl3 vapor, both of which are toxic, it can easily pollute the environment, especially posing a hazard to workers near the machine.

[0004] A diffusion furnace for photovoltaic cell manufacturing, published in Chinese Patent Publication No. CN112210831A, uses an inner sealing element to seal the opening of a quartz tube, preventing gas leakage from the tube. Combined with the vacuum chamber within the inner sealing element, this reduces heat loss due to air convection, thereby minimizing the temperature difference between the tube opening and its inner cavity. This improves the uniformity of the sheet resistance of the silicon wafers inside the tube. Furthermore, the deformation of the inner arc plate at high temperatures increases the pressure on the inner wall of the quartz tube, reducing gaps and further enhancing the seal. An outer cover is installed outside the furnace body, and the inner sealing element and outer cover are connected through a furnace door. By separating the quartz tube and introducing an aqueous solution into the outer casing, a small amount of gas leaking from the quartz tube can be dissolved and absorbed, preventing gas pollution of the environment. Furthermore, the reaction between the gas and the aqueous solution can serve as an alarm, achieving real-time monitoring of the sealing performance. A feedback circuit is formed by connecting a pressure gauge, pH meter, and outlet valve to a controller and a solenoid valve, controlling the opening and closing of the solenoid valve. This allows for the timely introduction of materials capable of absorbing harmful gases into the outer casing when the sealing performance suddenly drops, preventing a violent reaction between large amounts of harmful gases and water, and also preventing harmful gases from leaking into the environment, thus providing excellent protective performance. This effectively solves the problem of gas mixtures inside the quartz tube diffusing into the external environment through connection gaps. Since the gas mixture contains harmful Cl2 and unreacted POCl3 vapor, both of which are toxic and easily pollute the environment, especially posing a hazard to workers near the machine, this solution addresses the issue.

[0005] However, the above solution did not adequately improve the photovoltaic furnace door, and it still cannot effectively prevent the leakage of harmful gases, which is not conducive to the protection of workers. Therefore, improvements are needed. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a photovoltaic furnace door with good heat insulation and sealing performance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A photovoltaic furnace door with good heat insulation and sealing performance includes a door body assembly. The front end of the door body assembly is provided with a groove, and the rear end of the door body assembly is provided with a bearing groove. Two first through holes are opened at the bottom lower end of the groove, and a second through hole is opened at the bottom upper end of the groove, with the second through hole located between the two first through holes. A round tube and two collar members are fixed on the side wall of the bearing groove near the groove. The two first through holes are respectively located in the two collar members, and the inner diameter of the first through holes is the same as the inner diameter of the collar members. The second through hole is located in the round tube, and the inner diameter of the second through hole is the same as the inner diameter of the round tube. A connecting pipe is fixed to one end of the collar member. The round tube and the two connecting pipes all penetrate the bearing groove and extend to the rear end of the groove.

[0009] Compared with the prior art, this application, through the setting of corresponding components, can effectively ensure the connection between the door assembly and the furnace structure, and can make the door assembly and the furnace structure fit tightly together to avoid gaps. This can effectively achieve the function of heat insulation and sealing, prevent the leakage of harmful gases, better protect the relevant personnel, and improve the practicality of the product.

[0010] Preferably, a fixing ring is fixed on the side wall near the groove in the bearing groove. The fixing ring is provided with an adjustment mechanism. The adjustment mechanism is provided with multiple sliding rods. One end of the multiple sliding rods is fixed with an abutting ring. The abutting ring is provided with a sealing mechanism. The sealing mechanism and the inner wall of the door assembly abut against the outer wall of the fixing ring. The sealing mechanism is fixed with an abutting ring.

[0011] By adopting the above technical solution, the adjusting mechanism can make the contact ring and the furnace body fit tightly together, and the contact ring can fill the gaps at the contact points to prevent leakage, thereby improving the sealing effect and better protecting the relevant personnel. At the same time, the choice of contact ring material can further improve the heat insulation effect.

[0012] Preferably, the adjusting mechanism includes multiple movable plate assemblies disposed outside the fixed ring, each movable plate assembly having a winding wheel and a pull rope sleeved on it. The two ends of the pull rope are connected to the movable plate assemblies. A synchronization ring is connected to each of the multiple movable plate assemblies. Multiple sliding rods are respectively connected to the multiple movable plate assemblies. Multiple resistance springs are respectively sleeved on the multiple sliding rods and are respectively fixedly connected to the multiple movable plate assemblies. A screw is screwed into the door assembly and is connected to one of the movable plate assemblies.

[0013] By adopting the above technical solution, the screw component can provide power for the movement of the moving plate located in the center of the moving plate assembly. At the same time, the movement range of the moving plate assembly is expanded by the cooperation of the winding wheel component and the pull rope. Furthermore, the resistance spring component can achieve a buffering effect for the movement, while further ensuring the contact effect between the contact ring and the furnace body.

[0014] Preferably, the movable plate assembly consists of three movable plates arranged sequentially from top to bottom, with adjacent movable plates sliding and intercepting each other. One of the movable plates closest to the fixed ring is fixedly connected to the fixed ring. The winding wheel is rotatably sleeved on the movable plate located in the middle. The two ends of the pull rope are respectively fixed to the two movable plates located at the upper and lower ends. The two ends of the winding wheel and the pull rope are respectively located on both sides of the movable plate.

[0015] By adopting the above technical solution and setting the moving plate assembly structure, the moving plate in the middle can quickly push the moving plate at the top to move when it moves, thereby increasing the operating range. In addition, the resistance spring can better push the contact ring to move, which facilitates the contact ring to stably push the sealing mechanism to operate and ensure the sealing and heat insulation effect.

[0016] Preferably, a synchronization ring is fixed to one end of one of the multiple moving plates located in the middle.

[0017] By adopting the above technical solution, the synchronous ring component can ensure that multiple moving plate components operate synchronously, which facilitates the provision of external force for the stable operation of the sealing mechanism, so that the sealing mechanism can fully contact the furnace body and avoid uneven application of external force leading to poor sealing effect and leakage.

[0018] Preferably, multiple sliding rods are slidably mounted on the movable plates of multiple movable plate assemblies, away from the fixed ring.

[0019] By adopting the above technical solution and utilizing the installation position of the sliding rod, the advantage of the movable plate assembly in increasing the adjustment range can be fully utilized to achieve rapid adjustment.

[0020] Preferably, the sealing mechanism includes a connecting ring member fixed to one end of a plurality of abutting ring members. Two first sealing rings are fitted on both the inner and outer sides of the connecting ring member. Two first sealing rings located on the same side form a group. The two groups of first sealing rings abut against the side wall of the bearing groove and the outer side of the fixed ring member, respectively. The connecting ring member is located on one side of the movable plate assembly.

[0021] By adopting the above technical solution, the deformation of the first sealing ring can make it tightly contact the door assembly and the fixing ring, avoiding leakage and gaps. At the same time, by selecting appropriate materials during the manufacturing process, the wear resistance and heat insulation effect can be improved, and the service life can be extended.

[0022] Preferably, a second sealing ring is fitted on the side wall of the bearing groove, and the second sealing ring abuts against the outer side of the connecting ring.

[0023] By adopting the above technical solutions, the sealing effect can be further improved.

[0024] Preferably, a sliding assembly is fixed on the movable plate assembly, and a positioning rod is slidably installed inside the sliding assembly. One end of each positioning rod is slidably installed inside the connecting ring, and the other end of each positioning rod is fixedly connected to the side wall of the bearing groove near the groove.

[0025] By adopting the above technical solution, the stability of the movement of the upper moving plate and the connecting ring can be ensured by setting positioning rods, avoiding movement deviation, and allowing the contact ring to smoothly contact the furnace body.

[0026] Preferably, one end of the positioning rod is provided with a moving groove, and multiple ratchet teeth are fixed at equal intervals in the moving groove. An abutment rod is rotatably connected to one end side wall of the sliding assembly. A return spring is fixed together with the abutment rod and one end side wall of the sliding assembly. One end of the abutment rod extends between two adjacent ratchet teeth.

[0027] By adopting the above technical solution, the upper end of the contact rod can be inserted between two adjacent ratchet teeth through the action of the contact rod and the return spring, so that the sliding part can only move towards the furnace body relative to the positioning rod, thus fully ensuring the sealing of the contact ring and the furnace body.

[0028] The beneficial effects of this invention are:

[0029] 1. By providing corresponding components and structures on the door assembly, the connection between the door assembly and the furnace body components is fully ensured, facilitating the full closure of the furnace body components and the furnace body, and preventing gaps that could lead to the leakage of harmful gases;

[0030] 2. The screw mechanism enables the moving plate in the middle of the moving plate assembly to move. At the same time, the combination of the winding wheel and the pull rope enables the moving plate away from the fixed ring to move quickly, thereby helping to improve work efficiency.

[0031] 3. Through the cooperation of the resistance spring and the sliding rod, the first sealing ring can drive the contact ring to make contact, which facilitates better contact between the contact ring and the furnace body. At the same time, under the action of the resistance spring, the adaptability of the contact can be fully guaranteed, ensuring the sealing effect.

[0032] 4. The four first sealing rings on the coupling ring are designed to effectively abut against the side wall inside the bearing groove and the outer side of the fixed ring, thus preventing leakage and further ensuring the sealing effect.

[0033] 5. The sliding assembly allows the abutment rod to contact the ratchet teeth, while the return spring pushes the abutment rod back to its original position, making it easy for the abutment rod to insert between two adjacent ratchet teeth. The shape of the ratchet teeth ensures a firm contact, allowing the sliding assembly to move only in one direction, effectively guaranteeing a sealing effect and facilitating adjustment.

[0034] 6. The synchronous ring component enables the centrally located moving plate within the moving plate assembly to move synchronously, significantly improving operational synchronicity and ensuring the stability of the moving ring component. Attached Figure Description

[0035] Figure 1 This is a front view of a photovoltaic furnace door with good heat insulation and sealing performance proposed in this invention;

[0036] Figure 2 This is a structural diagram of a photovoltaic furnace door with good heat insulation and sealing performance proposed in this invention;

[0037] Figure 3 This is a side view of a photovoltaic furnace door with good heat insulation and sealing performance proposed in this invention;

[0038] Figure 4 This is a cross-sectional view of a photovoltaic furnace door with good heat insulation and sealing performance proposed in this invention;

[0039] Figure 5 This invention proposes a photovoltaic furnace door with good heat insulation and sealing performance. Figure 4 Enlarged view of point A;

[0040] Figure 6 This invention proposes a photovoltaic furnace door with good heat insulation and sealing performance. Figure 4 Enlarged view of point B;

[0041] Figure 7 This is a cross-sectional view of the positioning rod and sliding assembly of a photovoltaic furnace door with good heat insulation and sealing performance proposed in this invention;

[0042] In the diagram: 1. Door assembly, 2. Groove, 3. First through hole, 4. Second through hole, 5. Loop, 6. Bearing groove, 7. Round tube, 8. Connecting tube, 9. Screw, 10. Fixing ring, 11. Winding wheel, 12. Synchronizing ring, 13. Sliding rod, 14. Resistance spring, 15. Positioning rod, 16. Sliding assembly, 17. Moving plate assembly, 18. Pull rope, 19. Abutment ring, 20. Linking ring, 21. First sealing ring, 22. Second sealing ring, 23. Return spring, 24. Abutment rod, 25. Rattle tooth, 26. Moving groove, 27. Abutment ring. Detailed Implementation

[0043] 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.

[0044] Reference Figure 1-4A photovoltaic furnace door with good heat insulation and sealing performance includes a door assembly 1. The front end of the door assembly 1 is provided with a groove 2, and the rear end of the door assembly 1 is provided with a bearing groove 6. The groove structure helps to reduce the weight of the door assembly 1 and facilitates the connection of other corresponding structures. Two first through holes 3 are opened at the lower bottom of the groove 2, and a second through hole 4 is opened at the upper bottom of the groove 2. The second through hole 4 is located between the two first through holes 3. The diameter of the second through hole 4 is smaller than the diameter of the first through holes 3, which facilitates the installation of corresponding components and can be well connected to the furnace body, facilitating the detection of the furnace body. A round tube 7 and two collar 5 are fixed on the side wall of the bearing groove 6 near the groove 2. The two first through holes 3 are respectively located in the two collar 5. The inner diameter of the first through hole 3 and the collar 5 are respectively located in the two collar 5. The inner diameters of the components 5 are the same. The second through hole 4 is located inside the round tube 7. The inner diameter of the second through hole 4 is the same as the inner diameter of the round tube 7. One end of the collar component 5 is fixed with a connecting tube 8. The round tube 7 and the two connecting tubes 8 all pass through the bearing groove 6 and extend to the rear end of the groove 2, allowing the connecting tubes 8 and the round tube 7 to be inserted into the furnace body, thereby achieving the connection of the furnace body. At the same time, it can protect the components installed in the two connecting tubes 8 and the round tube 7, providing more effective protection. In actual production and preparation, materials with good heat resistance can be selected. At the same time, during processing, the firmness of the connection can be improved by welding and other methods to avoid loosening and ensure the stability of the components. It can also fully link with the external components to realize the rotation of the door assembly 1 relative to the furnace body, which is convenient for sealing.

[0045] Reference Figure 4-7 A fixing ring 10 is fixed on the side wall of the bearing groove 6 near the groove 2. The outer diameter of the fixing ring 10 is smaller than the inner diameter of the bearing groove 6, and the width of the fixing ring 10 is smaller than the depth of the inner side wall of the bearing groove 6, so that the fixing ring 10 is located in the bearing groove 6. The fixing ring 10 is provided with an adjustment mechanism, and the adjustment mechanism is provided with multiple sliding rods 13. One end of the multiple sliding rods 13 is fixed with a contact ring 19. The contact ring 19 is provided with a sealing mechanism. The sealing mechanism and the inner wall of the door assembly 1 abut against the outer wall of the fixing ring 10. The sealing mechanism is fixed with a contact ring 27. By controlling the adjustment mechanism, the purpose of rapid adjustment can be fully achieved, so that the contact ring 19 can push the sealing mechanism and the furnace body to abut against each other. The sealing mechanism can better ensure the sealing effect, fully placing the furnace opening completely inside the fixing ring 10, so that the sealing mechanism and the furnace body can fully abut against each other, and better avoid leakage.

[0046] Reference Figure 4-6The adjusting mechanism includes multiple movable plate assemblies 17 disposed outside the fixed ring 10. Each movable plate assembly 17 has a winding wheel 11, and a pull rope 18 is sleeved on the winding wheel 11. Both ends of the pull rope 18 are connected to the movable plate assemblies 17. A synchronization ring 12 is connected to all movable plate assemblies 17. Multiple sliding rods 13 are respectively connected to the multiple movable plate assemblies 17, and multiple resistance springs 14 are sleeved on each of the multiple sliding rods 13. The multiple resistance springs 14 are respectively fixed to the multiple movable plate assemblies 17. The door assembly 1 is connected to a screw rod 9, which is connected to one of the movable plate assemblies 17. The screw rod 9 enables the movable plate assembly 17 to operate quickly, and the winding wheel 11 and pull rope 18 on the movable plate assembly 17 can fully enhance its operating range. The movable plate assembly 17 operates synchronously through the corresponding mechanism, and the resistance spring 14 provides support force to adapt to errors in adjustment. It also helps to make the sealing mechanism and the furnace body contact each other, avoiding gaps.

[0047] Reference Figure 5 The movable plate assembly 17 consists of three movable plates arranged sequentially from top to bottom. Adjacent movable plates slide and intercept each other. One of the movable plates closest to the fixed ring 10 is fixedly connected to the fixed ring 10. The winding wheel 11 is rotatably sleeved on the movable plate located in the middle. The two ends of the pull rope 18 are respectively fixed to the two movable plates located at the upper and lower ends. The two ends of the winding wheel 11 and the pull rope 18 are located on both sides of the movable plate. When the movable plate located in the middle moves under the action of the screw 9, the winding wheel 11 can push the pull rope 18 to make the movable plate located at the upper end move quickly, improving its movement range and efficiency. This allows the movable plate to better push the sealing mechanism to move through the resistance spring 14, so that the sealing mechanism can contact the furnace body. One end of the multiple movable plates located in the middle is fixed together with a synchronization ring 12. The synchronization ring 12 can realize the synchronous operation of multiple movable plate assemblies 17, so that one of the movable plate assemblies 17 can operate under the action of the screw 9, and multiple movable plates located in the middle can move synchronously under the action of the synchronization ring 12.

[0048] Reference Figure 5 Multiple sliding rods 13 are slidably mounted on multiple movable plate assemblies 17 away from the fixed ring 10. The movable plate assembly 17 expands its range of movement. The movable plate at the top has the largest range of movement, which enables the movable plate at the top to drive the sliding rods 13 slidably mounted on it to move, so as to achieve the function of adjusting the sealing mechanism as quickly as possible.

[0049] Reference Figure 6The sealing mechanism includes a connecting ring 20 fixed to one end of multiple contact rings 19. Two first sealing rings 21 are fitted on both the inner and outer sides of the connecting ring 20. The two first sealing rings 21 on the same side form a group. The two groups of first sealing rings 21 respectively abut against the side wall of the bearing groove 6 and the outer side of the fixed ring 10. The connecting ring 20 is located on one side of the moving plate assembly 17. A second sealing ring 22 is fitted on the side wall of the bearing groove 6. The second sealing ring 22 abuts against the outer side of the connecting ring 20. The first sealing rings 21 and the second sealing ring 22 are both made of wear-resistant and heat-resistant materials. They can fully abut against the inner wall of the fixed ring 10, the connecting ring 20 and the bearing groove 6 through deformation, so as to better seal. They also extend the service life through wear resistance. They can fully seal the furnace opening, so that the gas inside cannot escape, ensuring the sealing effect and avoiding leakage.

[0050] Reference Figure 5 , 7 A sliding assembly 16 is fixed on the movable plate assembly 17. Positioning rods 15 are slidably installed inside the sliding assembly 16. One end of each positioning rod 15 is slidably installed inside the connecting ring 20, and the other end of each positioning rod 15 is fixedly connected to the side wall of the bearing groove 6 near the groove 2. A moving groove 26 is formed at one end of each positioning rod 15. Multiple ratchet teeth 25 are fixed at equal intervals inside the moving groove 26. An abutment rod 24 is rotatably connected to one end of the sliding assembly 16. The sliding assembly 16 and the positioning rods 15 work together to ensure stable movement. The abutment rod 24 and the side wall of one end of the sliding assembly 16 are rotatably connected. A reset spring 23 is fixed on the wall. One end of the abutment rod 24 extends between two adjacent ratchet teeth 25. The ratchet teeth 25 are set so that the ratchet teeth 25 are inclined on the side near the door assembly 1, and the back side is vertical or inclined in the same direction as the side near the door assembly 1. This makes it easy for the reset spring 23 to be squeezed when moving towards the furnace body, so that the upper end of the abutment rod 24 is inserted between two adjacent ratchet teeth 25. This makes the moving plate assembly 17 move only in one direction, which makes it easy for the operator to control the screw 9 to push the moving plate assembly 17 to operate. This can further ensure the sealing effect.

[0051] In this invention, during use, the door assembly 1 is connected to the furnace body, and the round pipe 7 and connecting pipe 8 extend into the furnace body. When closed, the operator can cause the screw 9 to drive the centrally located moving plate in one of the moving plate assemblies 17 to move away from the groove 2, which allows the winding wheel 11 to push the pull rope 18 to move the upper moving plate. At the same time, through the action of the synchronizing ring 12, multiple moving plate assemblies 17 can operate synchronously, and through the action of the resistance spring 14 and the sliding rod 13, the abutment ring 19 can be pushed to push the connecting... The movement of the collar 20 facilitates the contact between the abutment ring 27 at one end of the collar 20 and the furnace body. The sealing performance of the collar 20 is improved by the first sealing ring 21 and the second sealing ring 22. At the same time, when the upper moving plate in the moving plate assembly 17 moves, the sliding assembly 16 can move on the positioning rod 15. Meanwhile, the abutment rod 24 will abut against the ratchet tooth 25, causing the abutment rod 24 to move along the ratchet tooth 25 under the action of the return spring 23, and insert between two adjacent ratchet teeth 25 to fix the position of the sliding assembly 16.

[0052] 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 photovoltaic furnace door with good heat insulation and sealing performance, comprising a door body assembly (1), characterized in that: The front end of the door body assembly (1) is provided with a recess (2), the rear end of the door body assembly (1) is provided with a bearing groove (6), the bottom end of the recess (2) is provided with two first through holes (3), the bottom of the recess (2) is provided with a second through hole (4), the second through hole (4) is located between the two first through holes (3), the bearing groove (6) is fixed with a circular pipe (7) and two sleeve ring pieces (5) on the side wall close to the recess (2), the two first through holes (3) are located in the two sleeve ring pieces (5) respectively, the inner diameter of the first through hole (3) is the same as that of the sleeve ring piece (5), the second through hole (4) is located in the circular pipe (7), the inner diameter of the second through hole (4) is the same as that of the circular pipe (7), one end of the sleeve ring piece (5) is fixed with a connecting pipe (8), the circular pipe (7) and the two connecting pipes (8) penetrate through the bearing groove (6) and extend to the rear end of the recess (2); The side wall close to the recess (2) in the bearing groove (6) is fixed with a fixed ring piece (10), the fixed ring piece (10) is provided with an adjusting mechanism, the adjusting mechanism is provided with a plurality of slide rod pieces (13), one end of the plurality of slide rod pieces (13) is commonly fixed with a resisting ring piece (19), the resisting ring piece (19) is provided with a sealing mechanism, the sealing mechanism abuts against the inner wall of the door body assembly (1) and the outer wall of the fixed ring piece (10), the sealing mechanism is fixed with a resisting ring (27).

2. A photovoltaic oven door with good heat insulation and sealing performance according to claim 1, characterized in that: The adjusting mechanism comprises a plurality of moving plate assemblies (17) arranged outside the fixed ring piece (10), the moving plate assembly (17) is provided with a winding wheel piece (11), the winding wheel piece (11) is sleeved with a pull rope (18), the two ends of the pull rope (18) are connected with the moving plate assembly (17), the plurality of moving plate assemblies (17) are commonly connected with a synchronous ring piece (12), the plurality of slide rod pieces (13) are connected with the plurality of moving plate assemblies (17) respectively, the plurality of slide rod pieces (13) are respectively sleeved with a plurality of resistance springs (14), the plurality of resistance springs (14) are fixedly connected with the plurality of moving plate assemblies (17) respectively, the door body assembly (1) is screwed with a screw rod piece (9), the screw rod piece (9) is connected with one of the moving plate assemblies (17).

3. A photovoltaic oven door with good heat insulation and sealing performance according to claim 2, characterized in that: The moving plate assembly (17) comprises three moving plates arranged from top to bottom, the two adjacent moving plates slide and intercept each other, one of the moving plates closest to the fixed ring piece (10) is fixedly connected with the fixed ring piece (10), the winding wheel piece (11) is rotatably sleeved on the moving plate in the middle, the two ends of the pull rope (18) are fixed on the two moving plates at the upper end and the lower end respectively, the winding wheel piece (11) and the two ends of the pull rope (18) are located on the two sides of the moving plate respectively.

4. A photovoltaic oven door with good heat insulation and sealing performance according to claim 3, characterized in that: One end of the plurality of moving plates in the middle is commonly fixed with the synchronous ring piece (12).

5. A photovoltaic oven door with good heat insulation and sealing performance according to claim 4, characterized in that: The plurality of slide rod pieces (13) are slidably installed on the moving plates of the plurality of moving plate assemblies (17) away from the fixed ring piece (10).

6. A photovoltaic oven door with good heat insulation and sealing performance according to claim 1, characterized in that: The sealing mechanism comprises a sleeve ring (20) fixed at one end of the plurality of abutting ring members (19), the inner side and the outer side of the sleeve ring (20) are sleeved with two first sealing rings (21), the two first sealing rings (21) on the same side form a group, the two groups of first sealing rings (21) are respectively abutted with the side wall in the bearing groove (6) and the outer side of the fixed ring member (10), and the sleeve ring (20) is located at one side of the moving plate assembly (17).

7. A photovoltaic oven door with good heat insulation and sealing performance according to claim 6, characterized in that: The side wall in the bearing groove (6) is sleeved with a second sealing ring (22), and the second sealing ring (22) is abutted with the outer side of the sleeve ring (20).

8. A photovoltaic oven door with good heat insulation and sealing performance according to claim 6, characterized in that: The moving plate assembly (17) is fixed with a sliding sleeve member (16), the sliding sleeve member (16) is slidably installed with a positioning rod member (15), one end of the plurality of positioning rod members (15) is slidably installed in the sleeve ring (20), and the other end of the plurality of positioning rod members (15) is fixedly connected with the side wall in the bearing groove (6) close to the groove (2).

9. A thermally insulated photovoltaic oven door with good sealing properties according to claim 8, characterized in that: One end of the positioning rod member (15) is provided with a moving groove (26), a plurality of ratchet teeth members (25) are fixed in the moving groove (26) at equal intervals, one end of the side wall in the sliding sleeve member (16) is rotatably connected with an abutting rod (24), the abutting rod (24) and one end of the side wall in the sliding sleeve member (16) are jointly fixed with a return spring member (23), and one end of the abutting rod (24) extends between two adjacent ratchet teeth members (25).

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