A safe explosion-proof distribution box

Abstract

The application relates to the technical field of distribution boxes, in particular to a safe anti-explosion distribution box, which comprises a box body, an outer door rotatably installed on the box body, an inner door, and a mounting plate fixedly installed in the box body, a U-shaped mounting bracket, a limiting frame, a separation mechanism, an operating mechanism and a limiting mechanism are arranged between the mounting plate and the inner door, the U-shaped mounting bracket is fixedly connected with the mounting plate, a plurality of limiting grooves are arranged in the limiting frame, a plurality of grooves are arranged in the inner door, a connecting shaft is fixedly installed at one end of the U-shaped mounting bracket close to the inner door, a connecting mechanism is arranged at one end of the limiting frame close to the connecting shaft, a back-shaped frame and a containing frame are fixedly installed on one side of the inner door close to the mounting plate, and an L-shaped lifting frame is fixedly installed on one side of the U-shaped mounting bracket. The whole positioning process is simple, and the assembling efficiency of the distribution box in the manufacturing process of the power electronic component is improved.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, specifically to a safe and explosion-proof distribution box. Background Technology

[0002] In the field of power electronic component manufacturing, distribution boxes, as indispensable core power distribution equipment in power systems, are widely used in various scenarios such as industrial production, construction engineering, and residential electricity consumption. In hazardous environments with flammable and explosive gases or dust, such as oil refining, natural gas extraction, and chemical production, explosion-proof distribution boxes are crucial equipment for ensuring the safe operation of power systems and preventing safety accidents. Through special structural design, material selection, and protection technology, they effectively isolate electrical sparks, arcs, or high temperatures generated during the operation of internal electrical components, confining them inside the box and preventing the ignition of external explosive mixtures. In existing technologies, to achieve dual protection for the internal electrical components and convenient operation, most distribution boxes adopt a double-door structure design, that is, a combination of an outer door and an inner door. The two doors have clear division of labor and work together to ensure the safe operation and ease of use of the distribution box.

[0003] The inner door typically has a groove, the position and size of which precisely correspond to the operating position of electrical components such as miniature circuit breakers. This allows maintenance personnel to directly operate the miniature circuit breakers and other electrical components by simply opening the outer door and accessing the groove in the inner door during routine maintenance. In existing technology, personnel need to place each miniature circuit breaker and other electrical components one by one on the mounting plate, ensuring their installation position corresponds to the groove in the inner door before fixing them in place. Therefore, it is necessary to first preliminarily determine the installation position of the miniature circuit breakers and other electrical components on the mounting plate by drawing lines. After drawing the lines, the inner door needs to be closed to check the correspondence between the drawn lines and the grooves. If there is a deviation, the inner door needs to be reopened to adjust the drawn lines. This process of repeatedly opening and closing the inner door and adjusting the positioning is repeated until the precise installation position of the miniature circuit breakers and other electrical components is determined. The entire positioning process is cumbersome and time-consuming, significantly reducing the assembly efficiency of distribution boxes during the manufacturing of power electronic components. Summary of the Invention

[0004] The purpose of this invention is to provide a safe and explosion-proof distribution box to solve the problem mentioned in the background art that the installation positions of electrical components such as miniature circuit breakers need to be preliminarily determined on the mounting plate by drawing lines, etc. The whole positioning process is cumbersome and time-consuming, which greatly reduces the assembly efficiency of the distribution box in the manufacturing process of power electronic components.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a safe and explosion-proof distribution box, comprising a box body, an outer door rotatably mounted to the box body, an inner door, and a mounting plate fixedly mounted inside the box body. A U-shaped mounting bracket, a limiting frame, a separation mechanism, an operating mechanism, and a limiting mechanism are provided between the mounting plate and the inner door. The U-shaped mounting bracket is fixedly connected to the mounting plate. Multiple limiting grooves are provided inside the limiting frame. Multiple recesses are provided in the inner door, and each recess corresponds to one of the limiting grooves. A connecting shaft is fixedly mounted on one end of the U-shaped mounting bracket near the inner door. A connecting mechanism is provided on one end of the limiting frame near the connecting shaft. A U-shaped frame and a receiving frame are fixedly mounted on one side of the inner door near the mounting plate. An L-shaped support frame is fixedly mounted on one side of the U-shaped mounting bracket.

[0006] Preferably, the connecting mechanism includes two locking seats, each with a locking block slidably installed inside. Both ends of each locking block are slidably fitted with positioning rods. Multiple positioning rods are fixedly installed at one end of their respective locking seats. A spring is fitted on the outside of each positioning rod. A toggle plate is fixedly installed on one side of both locking blocks.

[0007] Preferably, the separation mechanism includes two movable blocks, each of which has two guide rods slidably mounted on one side near the U-shaped frame. Multiple guide rods are fixedly mounted on one side of the U-shaped frame. Each of the two movable blocks has a guide groove inside. A top plate is fixedly mounted on one side of both movable blocks, and the top plate cooperates with the actuating plate.

[0008] Preferably, the limiting mechanism includes two movable blocks, a linkage component, and multiple reset components. Two guide rods are slidably fitted on the side of each of the two movable blocks near the U-shaped frame. Multiple guide rods are fixedly installed on one side of the U-shaped frame. Guide grooves are opened inside the two movable blocks. Push blocks are fixedly installed on the side of each movable block that is far away from each other.

[0009] Preferably, the linkage component includes a connecting bracket and a second linkage bracket. The connecting bracket is fixedly connected to two movable blocks. Both ends of the connecting bracket are slidably mounted with first linkage brackets. A pressure plate is fixedly mounted on the side of each of the first linkage brackets near the second linkage bracket. Two pressure plates are fixedly mounted on the side of the second linkage bracket near the two first linkage brackets. A trapezoidal block is fixedly mounted on the side of each of the two pressure plates near the mounting plate. The two trapezoidal blocks cooperate with the two push blocks respectively. A strip groove is opened at the ends of the two first linkage brackets that are far apart from each other and at both ends of the second linkage bracket. Multiple reset components are respectively disposed inside the multiple strip grooves.

[0010] Preferably, the linkage assembly further includes two linkage rods, both of which are rotatably connected to the U-shaped frame. Slider blocks are rotatably installed at both ends of the two linkage brackets. Slide grooves are provided at one end of the first linkage bracket and at both ends of the second linkage bracket. Multiple sliders are slidably installed inside their respective slide grooves.

[0011] Preferably, the reset assembly includes a mounting rod, which is fixedly connected to the U-shaped frame and disposed inside a corresponding strip groove. A second spring is sleeved on the outside of the mounting rod, and a circular plate is slidably sleeved on the outside of the mounting rod.

[0012] Preferably, the operating mechanism includes a threaded rod and two limiting rods. The threaded rod is rotatably connected to the U-shaped frame. The threaded rod passes through the inner door and extends to the outside of the inner door. The two limiting rods are symmetrically arranged on both sides of the threaded rod and are fixedly connected to the U-shaped frame. A connecting plate is threadedly connected to the outside of the threaded rod. The two ends of the connecting plate are slidably sleeved on the outside of the two limiting rods. A transmission rod is fixedly installed on one end of the connecting plate. The two ends of the transmission rod are slidably sleeved inside the guide groove one and the guide groove two, respectively.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention uses a limiting frame to limit the position of electrical components such as miniature circuit breakers, replacing the existing method of positioning miniature circuit breakers and other electrical components by drawing lines. It eliminates the need to repeatedly open and close inner doors and repeatedly adjust the position of electrical components such as miniature circuit breakers. The entire positioning process is simple and helps to improve the assembly efficiency of distribution boxes in the manufacturing process of power electronic components.

[0014] This invention, through the setting of a separation mechanism and a limiting mechanism, allows the mounting plate to be installed inside the enclosure. By using an operating mechanism, the separation mechanism is activated accordingly, thereby separating the limiting frame from the connecting shaft. Simultaneously, under the action of the limiting mechanism, the limiting frame is retracted into the receiving frame. When the inner door is opened subsequently, the limiting frame and the inner door open and close synchronously, thus not affecting the maintenance or replacement of multiple electrical components inside the enclosure by the staff. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the mounting plate and inner door assembly of the present invention. Figure 3 This is a schematic diagram of the other side of the mounting plate and inner door assembly of the present invention; Figure 4 This is a schematic diagram of the mounting plate structure of the present invention; Figure 5 This is a schematic diagram of the connecting mechanism and limiting frame structure of the present invention; Figure 6 This is a schematic diagram of a partial connection mechanism of the present invention; Figure 7 This is a partial structural diagram of the present invention; Figure 8 This is a schematic diagram of the combined structure of the spiral frame, the receiving frame, the separating mechanism, the limiting mechanism, and the operating mechanism of the present invention. Figure 9 This is a schematic diagram of the combined structure of the separation mechanism, the limiting mechanism, and the operating mechanism of the present invention. Figure 10 This is a schematic diagram of the partial separation mechanism, the operating mechanism, and the structure of the operating mechanism of the present invention; Figure 11 This is a schematic diagram of one side of the linkage component of the present invention; Figure 12 This is a schematic diagram of the other side of the linkage component of the present invention; Figure 13 for Figure 12 Enlarged view of point A in the image; Figure 14 This is a schematic diagram of the partial separation mechanism of the present invention.

[0016] In the attached diagram, the components represented by each number are as follows: 1. Housing; 2. Outer door; 3. Inner door; 4. Groove; 5. Mounting plate; 6. U-shaped mounting bracket; 7. Limiting frame; 8. Limiting groove; 9. Connecting shaft; 10. Snap-fit ​​seat; 11. Snap-fit ​​block; 12. Positioning rod; 13. Spring 1; 14. U-shaped frame; 15. Moving block 1; 16. Guide rod 1; 17. Guide groove 1; 18. Top plate; 19. Moving block 2; 20. Guide rod 2; 21. Guide... 21. Slot 2; 22. Push block; 23. Connecting bracket; 24. Linkage bracket 1; 25. Linkage bracket 2; 26. Pressing plate 1; 27. Pressing plate 2; 28. Trapezoidal block; 29. ​​Strip groove; 30. Linkage rod; 31. Slider; 32. Slide groove; 33. Mounting rod; 34. Spring 2; 35. Circular plate; 36. Threaded rod; 37. Limiting rod; 38. Connecting plate; 39. Transmission rod; 40. Receiving frame; 41. L-shaped lifting frame; 42. Actuating plate. Detailed Implementation

[0017] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a technical solution: such as Figures 1-14 The safety explosion-proof distribution box shown includes a box body 1, an outer door 2 and an inner door 3 rotatably mounted to the box body 1, and a mounting plate 5 fixedly installed inside the box body 1. A U-shaped mounting bracket 6, a limiting frame 7, a separation mechanism, an operating mechanism, and a limiting mechanism are provided between the mounting plate 5 and the inner door 3. The U-shaped mounting bracket 6 is fixedly connected to the mounting plate 5. The limiting frame 7 has multiple limiting grooves 8 inside. The inner door 3 has multiple recesses 4, which correspond to the multiple limiting grooves 8 respectively. A connecting shaft 9 is fixedly installed at one end of the U-shaped mounting bracket 6 near the inner door 3. A connecting mechanism is provided at one end of the limiting frame 7 near the connecting shaft 9. A U-shaped frame 14 and a receiving frame 40 are fixedly installed on one side of the inner door 3 near the mounting plate 5. An L-shaped support frame 41 is fixedly installed on one side of the U-shaped mounting bracket 6.

[0019] The connecting mechanism includes two locking seats 10, and locking blocks 11 are slidably installed inside the two locking seats 10. Positioning rods 12 are slidably sleeved at both ends of the two locking blocks 11. Multiple positioning rods 12 are respectively fixedly installed at one end of their respective locking seats 10. Springs 13 are sleeved on the outside of the multiple positioning rods 12. A toggle plate 42 is fixedly installed on one side of the two locking blocks 11.

[0020] The separation mechanism includes two movable blocks 15. Two guide rods 16 are slidably installed on the side of each movable block 15 near the U-shaped frame 14. Multiple guide rods 16 are fixedly installed on one side of the U-shaped frame 14. Guide grooves 17 are opened inside each of the two movable blocks 15. A top plate 18 is fixedly installed on one side of the two movable blocks 15. The top plate 18 cooperates with the actuating plate 42.

[0021] The limiting mechanism includes two movable blocks 19, a linkage component, and multiple reset components. Two guide rods 20 are slidably sleeved on the side of the two movable blocks 19 closest to the U-shaped frame 14. Multiple guide rods 20 are fixedly installed on one side of the U-shaped frame 14. Guide grooves 21 are opened inside the two movable blocks 19. Push blocks 22 are fixedly installed on the side of the two movable blocks 19 that are far apart from each other.

[0022] The linkage assembly includes a connecting bracket 23 and a second linkage bracket 25. The connecting bracket 23 is fixedly connected to two moving blocks 15. Both ends of the connecting bracket 23 are slidably mounted with a first linkage bracket 24. A first clamping plate 26 is fixedly mounted on the side of the two first linkage brackets 24 near the second linkage bracket 25. Two second clamping plates 27 are fixedly mounted on the side of the second linkage bracket 25 near the two first linkage brackets 24. A trapezoidal block 28 is fixedly mounted on the side of the two clamping plates 26 near the mounting plate 5. The two trapezoidal blocks 28 cooperate with the two push blocks 22 respectively. The ends of the two first linkage brackets 24 that are far apart from each other and both ends of the second linkage bracket 25 are provided with strip grooves 29. Multiple reset components are respectively disposed inside the multiple strip grooves 29.

[0023] The linkage assembly also includes two linkage rods 30, both of which are rotatably connected to the U-shaped frame 14. Slider 31 is rotatably installed at both ends of the two linkage rods 30. Slide grooves 32 are provided at one end of the two linkage brackets 1 24 and at both ends of the linkage bracket 2 25. Multiple sliders 31 are slidably installed inside their respective slide grooves 32.

[0024] The reset assembly includes a mounting rod 33, which is fixedly connected to the U-shaped frame 14 and is disposed inside the corresponding strip groove 29. A spring 34 is sleeved on the outside of the mounting rod 33, and a circular plate 35 is slidably sleeved on the outside of the mounting rod 33.

[0025] The operating mechanism includes a threaded rod 36 and two limiting rods 37. The threaded rod 36 is rotatably connected to the U-shaped frame 14. The threaded rod 36 passes through the inner door 3 and extends to the outside of the inner door 3. The two limiting rods 37 are symmetrically arranged on both sides of the threaded rod 36 and are fixedly connected to the U-shaped frame 14. A connecting plate 38 is threadedly connected to the outside of the threaded rod 36. The two ends of the connecting plate 38 are slidably sleeved on the outside of the two limiting rods 37. A transmission rod 39 is fixedly installed on one end of the connecting plate 38. The two ends of the transmission rod 39 are slidably sleeved inside the guide groove 17 and the guide groove 21, respectively.

[0026] Working principle: In use, first remove the mounting plate 5 from inside the housing 1 and lay it flat on the ground. Then push the actuating plate 42 to slide the two locking blocks 11. The two locking blocks 11 are respectively inserted into their corresponding locking seats 10. The two locking blocks 11 slide stably along their corresponding positioning rods 12. While the two locking blocks 11 are sliding, they compress multiple springs 13. Then place the two locking seats 10 at both ends of the connecting shaft 9. Immediately afterward, release the actuating plate 42. Under the action of multiple springs 13, the two locking seats 10 are located outside the connecting shaft 9, cooperating with the two locking blocks 11 to realize the connection between the limiting frame 7 and the connecting shaft 9. The L-shaped support frame 41 supports one end of the limiting frame 7, making the limiting frame 7 more stable. With the positioning frame 7 in a horizontal position, electrical components such as miniature circuit breakers are placed on the mounting plate 5. By rotating the positioning frame 7 around the connecting shaft 9, the position of the electrical components such as miniature circuit breakers is adjusted, and the electrical components such as miniature circuit breakers are placed in their respective corresponding positions in the positioning slots 8, thereby limiting the position of the electrical components such as miniature circuit breakers. Then, the electrical components such as miniature circuit breakers can be fixed in the mounting plate 5. This installation method replaces the existing method of positioning the electrical components such as miniature circuit breakers by drawing lines. It does not require repeatedly opening and closing the inner door 3 and repeatedly adjusting the position of the electrical components such as miniature circuit breakers. The entire positioning process is simple and helps to improve the assembly efficiency of the distribution box in the manufacturing process of power electronic components. After fixing the miniature circuit breaker and other electrical components that do not need to be exposed in the mounting plate 5 and completing the wire connection between each electrical component, the limiting frame 7 is placed in a horizontal state. Then, the entire mounting plate 5 is placed inside the box 1 and fixed inside the box 1. Immediately afterwards, the inner door 3 can be closed, and the limiting frame 7 enters the interior of the receiving frame 40. By rotating the threaded rod 36, under the action of the two limiting rods 37, the connecting plate 38 and the transmission rod 39 are moved towards one side of the mounting plate 5. The transmission rod 39 slides inside the two guide grooves 17 and 21. During the first stage of sliding, the transmission rod 39 first slides inside the inclined grooves of the two guide grooves 17 and then inside the horizontal grooves of the two guide grooves 21. The two moving blocks 15 slide along their respective guide rods 16 toward the receiving frame 40. The top plate 18 gradually approaches the actuating plate 42 and then pushes the actuating plate 42, causing the two locking blocks 11 to retract into their respective locking seats 10. Inside, the limiting frame 7 is separated from the connecting shaft 9. At the same time, the two moving blocks 15 drive the connecting bracket 23 to move synchronously, which in turn drives the two linkage brackets 24 to move synchronously. At this time, the sliders 31 at both ends of the two linkage rods 30 slide inside their respective corresponding slide grooves 32. The linkage bracket 25 moves synchronously closer to each other with the two linkage brackets 24. The two linkage brackets 24 and the linkage bracket 25 drive the strip groove 29 to slide along their respective corresponding mounting rods 33. The two clamping plates 26 and the two clamping plates 27 cover the side of the limiting frame 7. At this time, the two moving blocks 19 do not move. During the second stage of sliding, the transmission rod 39 slides from the inclined groove of the two guide grooves 17 to the interior of the horizontal groove, and from the horizontal groove of the two guide grooves 21 to the interior of the inclined groove. At this time, the two moving blocks 15 no longer move, the actuating plate 42 is pushed to the maximum position, the two locking blocks 11 are fully retracted into their respective locking seats 10, and the two moving blocks 19 slide along their respective guide rods 20 toward the receiving frame 40. The push blocks 22 in the two moving blocks 19 act on their respective trapezoidal blocks 28, and the two trapezoidal blocks 28 are driven by force to slide the two linkage brackets 24 at the ends of the connecting brackets 23. Under the action of rod 30, linkage bracket 25 and two linkage brackets 24 move synchronously towards the side closer to inner door 3. Linkage bracket 25 and two linkage brackets 24 push their respective circular plates 35 to move. Multiple circular plates 35 move outside their respective mounting rods 33 and squeeze multiple springs 34. Two clamping plates 26 and two clamping plates 27 push the corresponding ends of the limiting frame 7 to move, so that the limiting frame 7 is retracted into the housing frame 40. When the inner door 3 is opened later, the limiting frame 7 and the inner door 3 open and close synchronously, so as not to affect the maintenance or replacement of multiple electrical components inside the box 1 by the staff.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A safe and explosion-proof distribution box, comprising a box body (1), an outer door (2) rotatably mounted to the box body (1), an inner door (3), and a mounting plate (5) fixedly installed inside the box body (1), characterized in that: A U-shaped mounting bracket (6), a limiting frame (7), a separation mechanism, an operating mechanism, and a limiting mechanism are provided between the mounting plate (5) and the inner door (3). The U-shaped mounting bracket (6) is fixedly connected to the mounting plate (5). The limiting frame (7) has multiple limiting grooves (8) inside. The inner door (3) has multiple grooves (4). The multiple grooves (4) correspond to the multiple limiting grooves (8) respectively. A connecting shaft (9) is fixedly installed at one end of the U-shaped mounting bracket (6) near the inner door (3). A connecting mechanism is provided at one end of the limiting frame (7) near the connecting shaft (9). A U-shaped frame (14) and a receiving frame (40) are fixedly installed on one side of the inner door (3) near the mounting plate (5). An L-shaped support frame (41) is fixedly installed on one side of the U-shaped mounting bracket (6).

2. The explosion-proof distribution box according to claim 1, characterized in that: The connecting mechanism includes two locking seats (10), and locking blocks (11) are slidably installed inside the two locking seats (10). Positioning rods (12) are slidably sleeved at both ends of the two locking blocks (11). Multiple positioning rods (12) are respectively fixedly installed at one end of their respective locking seats (10). Springs (13) are sleeved on the outside of the multiple positioning rods (12). A toggle plate (42) is fixedly installed on one side of the two locking blocks (11).

3. The explosion-proof distribution box according to claim 1, characterized in that: The separation mechanism includes two movable blocks (15). Two guide rods (16) are slidably installed on the side of the two movable blocks (15) near the U-shaped frame (14). Multiple guide rods (16) are fixedly installed on one side of the U-shaped frame (14). Guide grooves (17) are opened inside the two movable blocks (15). A top plate (18) is fixedly installed on one side of the two movable blocks (15). The top plate (18) cooperates with the actuating plate (42).

4. The explosion-proof distribution box according to claim 2, characterized in that: The limiting mechanism includes two movable blocks (19), a linkage component and multiple reset components. Two guide rods (20) are slidably sleeved on the side of the two movable blocks (19) near the U-shaped frame (14). Multiple guide rods (20) are fixedly installed on one side of the U-shaped frame (14). Guide grooves (21) are opened inside the two movable blocks (19). Push blocks (22) are fixedly installed on the side of the two movable blocks (19) that are far apart from each other.

5. The explosion-proof distribution box according to claim 4, characterized in that: The linkage assembly includes a connecting bracket (23) and a second linkage bracket (25). The connecting bracket (23) is fixedly connected to two moving blocks (15). Both ends of the connecting bracket (23) are slidably mounted with a first linkage bracket (24). Both first linkage brackets (24) are fixedly mounted with a first pressure plate (26) on the side of the second linkage bracket (25) near the second linkage bracket (25). Both second linkage brackets (25) are fixedly mounted with two second pressure plates (27) on the side of the second linkage bracket (25) near the two first linkage brackets (24). Both first pressure plates (26) are fixedly mounted with trapezoidal blocks (28) on the side of the mounting plate (5). The two trapezoidal blocks (28) cooperate with the two push blocks (22) respectively. The ends of the two first linkage brackets (24) that are far apart from each other and both ends of the second linkage bracket (25) are provided with strip grooves (29). Multiple reset components are respectively disposed inside multiple strip grooves (29).

6. The explosion-proof distribution box according to claim 5, characterized in that: The linkage assembly also includes two linkage rods (30), both of which are rotatably connected to the U-shaped frame (14). Both ends of the two linkage rods (30) are rotatably mounted with sliders (31). One end of the two linkage brackets (24) and both ends of the linkage bracket (25) are provided with grooves (32). Multiple sliders (31) are slidably installed inside their respective grooves (32).

7. A safe and explosion-proof distribution box according to claim 4, characterized in that: The reset assembly includes a mounting rod (33), which is fixedly connected to the U-shaped frame (14), and the mounting rod (33) is disposed inside the corresponding strip groove (29). A spring (34) is sleeved on the outside of the mounting rod (33), and a circular plate (35) is slidably sleeved on the outside of the mounting rod (33).

8. A safe and explosion-proof distribution box according to claim 4, characterized in that: The operating mechanism includes a threaded rod (36) and two limiting rods (37). The threaded rod (36) is rotatably connected to the U-shaped frame (14). The threaded rod (36) passes through the inner door (3) and extends to the outside of the inner door (3). The two limiting rods (37) are symmetrically arranged on both sides of the threaded rod (36) and are fixedly connected to the U-shaped frame (14). The threaded rod (36) is threadedly connected to a connecting plate (38). The two ends of the connecting plate (38) are slidably sleeved on the outside of the two limiting rods (37). A transmission rod (39) is fixedly installed on one end of the connecting plate (38). The two ends of the transmission rod (39) are slidably sleeved inside the guide groove one (17) and the guide groove two (21).

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