Flexible sealing device for square flange of vacuum container

Abstract

The present invention belongs to the technical field of transport containers, and specifically relates to a square flange flexible sealing device for a vacuum container, comprising a cabin body, a reinforcing short section connected to the cabin body, a cabin flange provided at the end of the reinforcing short section away from the cabin body, a cabin door rotatably provided on the cabin flange, the cabin door comprising an arc-shaped reinforcing plate, a cabin door flange provided on the arc-shaped reinforcing plate in cooperation with the cabin flange, the cabin flange as a whole being arranged in a square frame, the square frame comprising a hinged frame and three free frames, a clamping mechanism provided on the outer side surface of the free frame of the cabin flange in cooperation with the cabin door flange, and a clamping mechanism provided on the outer side surface of the hinged frame of the cabin flange in cooperation with the cabin door flange. This device can ensure stable sealing of the vacuum container and is suitable for sealing scenarios with high frequency opening and closing.

Description

Technical Field

[0001] The invention belongs to the technical field of transport containers, and in particular relates to a flexible sealing device for a square flange of a vacuum container. Background Art

[0002] As core equipment in vacuum engineering, vacuum vessels are widely used in processes such as vacuum coating, vacuum distillation, and vacuum environment simulation. The establishment and maintenance of the internal vacuum state depends on reliable sealing performance. Vacuum vessels are usually composed of a cabin, a door, hinges, and a sealing structure. The door is connected to the cabin using hinges. The cabin is mostly cylindrical in structure and equipped with a circular flange, and is sealed to the door through an annular sealing groove. However, with the development of technologies such as precision manufacturing and space simulation, the requirements for the utilization rate of the effective space inside the vacuum vessel are increasing. Rectangular vacuum vessels have a right-angle layout that can significantly compress the harmful space formed by curved corners, making them the preferred solution for increasing the effective space inside the cabin. This can significantly reduce the vacuum system's exhaust, detection, and control loads.

[0003] However, rectangular vacuum vessels require a square flange for sealing, but the manufacturing and sealing of square flanges face numerous technical bottlenecks. The sealing groove of a rectangular vacuum vessel is non-rotationally symmetrical, requiring machining with specialized equipment such as CNC milling machines and machining centers equipped with multi-axis linkage capabilities. This requires high machine tool precision and tool rigidity, and the right-angled structure of the sealing groove is prone to burrs and cracks during machining, making it difficult to process. Furthermore, the sealing groove of a rectangular vacuum vessel has a weak constraint on the sealing ring, which can easily shift and fall off during the frequent opening and closing of the hatch and cabin, increasing the risk of seal failure under vacuum conditions.

[0004] Chinese patent CN105800197A discloses a reinforcement structure for a door flange of a large square-shaped vacuum container. The structure comprises a large square-shaped vacuum container wall panel and a door flange on a side panel for connecting to the door. A cross-shaped reinforcement structure composed of longitudinal and transverse ribs is arranged on the wall panel. Circumferential annular back ribs are arranged circumferentially around the door flange, midway between the first longitudinal rib closest to the door flange and the door flange. Transverse flange connection ribs are arranged equidistantly between the annular back ribs, the first longitudinal ribs, and the door flange. This patent utilizes the cross-shaped ribs on the wall panel to connect the container flange to the frame formed by the wall panel ribs via transverse and longitudinal ribs, making the container flange an integral part of the overall rib frame and effectively improving the flange's rigidity. However, this patent does not optimize the vacuum container's sealing groove structure, still using a traditional sealing groove. This fails to address the difficulty in machining the square vacuum container sealing groove and the poor sealing ring fixation, which can lead to sealing failure of the square flange in a vacuum environment. Summary of the Invention

[0005] The purpose of the present invention is to provide a flexible sealing device for a square flange of a vacuum container, which can reduce the risk of displacement and falling off of the sealing ring, avoid the problem of vacuum degree drop due to local leakage, ensure the long-term stable operation of the vacuum container, and is suitable for sealing scenarios with high frequency opening and closing.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] The square flange flexible sealing device of a vacuum container described in the present invention includes a cabin body, which is arranged in a rectangular shape as a whole, and a reinforcing short section is connected to the cabin body. The end of the reinforcing short section away from the cabin body is provided with a cabin flange, and a cabin door is rotatably provided on the cabin flange, the cabin door includes an arc-shaped reinforcing plate, and a cabin door flange is provided on the arc-shaped reinforcing plate to cooperate with the cabin flange. The cabin flange is arranged in a square frame as a whole, the square frame includes a hinged frame and three free frames, the hinged frame and the three free frames are connected end to end in sequence, the outer side surface of the free frame of the cabin flange is provided with a clamping mechanism to cooperate with the cabin door flange, the outer side surface of the hinged frame of the cabin flange is provided with a clamping mechanism to cooperate with the cabin door flange, the end surface of the cabin flange is provided with an inner pressure strip and an outer pressure strip, and a sealing ring is provided between the inner pressure strip and the outer pressure strip, the clamping mechanism includes a handle, a cam and a pressure rod, and the clamping mechanism pushes the cabin door flange to fit with the cabin flange through the rotation of the cam, and the clamping mechanism includes a through shaft, a spring and an adjusting nut, and the clamping mechanism pushes the cabin door flange to press the cabin flange through the spring and the adjusting nut.

[0008] Furthermore, a pressure rod fixing seat is fixedly provided on the outer side surface of the free frame of the cabin flange in cooperation with the clamping mechanism. The pressure rod fixing seat is hingedly connected to the pressure rod. The cam is rotatably provided at one end of the pressure rod away from the pressure rod fixing seat, and the handle is fixedly connected to the cam.

[0009] Furthermore, the outer side surface of the hinged frame of the cabin flange is fixed with an upper cabin fixing seat and a lower cabin fixing seat in cooperation with the clamping mechanism, an upper pin shaft is passed through the upper cabin fixing seat, and a lower pin shaft is passed through the lower cabin fixing seat, and the hatch flange is fixed with an upper cabin door fixing seat and a lower cabin door fixing seat in cooperation with the clamping mechanism.

[0010] Furthermore, the through shaft passes through the upper hatch fixing seat, the upper pin shaft, the lower hatch fixing seat and the lower pin shaft in sequence, an upper copper sleeve is provided between the upper hatch fixing seat and the through shaft, a lower copper sleeve is provided between the lower hatch fixing seat and the through shaft, and an anti-extraction bolt is provided at the lower end of the through shaft.

[0011] Furthermore, the adjusting nut includes an upper adjusting nut and a lower adjusting nut. The upper adjusting nut is rotatably set on the upper pin shaft and is located at one end of the upper pin shaft close to the cabin body. The lower adjusting nut is rotatably set on the lower pin shaft and is located at one end of the lower pin shaft close to the cabin body.

[0012] Furthermore, the spring includes an upper spring and a lower spring, and the upper spring and the lower spring are respectively sleeved on the upper pin shaft and the lower pin shaft.

[0013] Furthermore, one end of the upper spring is arranged on the upper cabin fixing seat, and the other end of the upper spring is arranged on the upper adjusting nut; one end of the lower spring is arranged on the lower cabin fixing seat, and the other end of the lower spring is arranged on the lower adjusting nut.

[0014] Furthermore, the outer bead is arranged close to the outer edge of the cabin flange, the inner bead is arranged close to the center of the cabin flange, and the inner bead and the outer bead are arranged at intervals.

[0015] Furthermore, the cross section of the sealing ring is circular, the thickness of the outer bead is equal to 0.75 times the diameter of the sealing ring cross section, the thickness of the inner bead is equal to the thickness of the outer bead, and the distance between the inner bead and the outer bead is equal to 0.9 times the diameter of the sealing ring cross section.

[0016] The inner molding and the outer molding cooperate with each other to form a sealing groove for placing the sealing ring. The side of the inner molding close to the sealing groove and the side of the outer molding close to the sealing groove are both inclined inwardly of the sealing groove, so that the cross-section of the sealing groove is in the shape of a dovetail. When making the sealing ring, a sealing ring of a specific length can be directly produced according to the actual size of the cabin flange and the sealing requirements. If there is no ready-made sealing ring of suitable length, a longer sealing ring can be selected first, cut off according to the required length, and then the cross-section of the cut is cut into an oblique end, and the oblique ends are glued together to form a complete sealing ring.

[0017] Furthermore, the cam is arranged as an eccentric disc as a whole, and the outer peripheral contour of the cam includes an eccentric arc segment and a straight segment. The outer peripheral contour of the cam is formed by connecting the eccentric arc segment and the straight segment end to end; an upper support plate and a lower support plate are arranged between the arc reinforcement plate and the cabin door flange.

[0018] When installing the cabin flange, first cut the thick steel plate into steel bars, splice the steel bars to form the cabin flange blank, and then weld it together with the reinforcing short section. After welding, turn the cabin flange blank to ensure the sealing surface accuracy of the cabin flange blank and complete the cabin flange installation.

[0019] When installing the hatch flange, first cut the thick steel plate into steel bars, splice the steel bars to form the hatch flange blank, and then weld it together with the arc-shaped reinforcement plate, upper support plate and lower support plate. After welding is completed, the hatch flange blank is turned to ensure the sealing surface accuracy of the hatch flange blank and complete the hatch flange installation.

[0020] The beneficial effects of the present invention are:

[0021] The inner and outer pressure strips are assembled to form a sealing groove. When the door flange is fitted with the cabin flange, the sealing ring can be naturally clamped between the inner and outer pressure strips to avoid local sealing failure due to installation deviation. The inner and outer pressure strips are fixed on the end face of the cabin flange, which can limit the displacement or deformation of the sealing ring, maintain the stability of the sealing structure, and reduce the risk of displacement of the sealing ring when the door is frequently opened and closed.

[0022] The dovetail-shaped sealing groove can limit the movement of the sealing ring to both sides, so that it can better fill the sealed space, prevent gas leakage, and improve the sealing and stability of the device; the reinforcing short section is first welded to the cabin flange as an independent component to form a "cabin flange-reinforcement short section" combination. When it is subsequently welded to the cabin, the reinforcing short section can absorb the welding thermal stress and avoid the cabin flange from directly bearing the stress, thereby preventing the cabin flange from thermal deformation; the door flange, arc-shaped reinforcement plate, upper support plate and lower support plate are welded into a whole at one time, reducing the number of welding times and eliminating the thermal deformation of the door flange caused by the accumulation of thermal stress. At the same time, the arc-shaped reinforcement plate enhances the door's anti-deformation ability and improves the overall structural strength of the door.

[0023] The clamping mechanism can compress the spring by rotating the adjusting nut, thereby converting the spring's elastic potential energy into a preload force between the door flange and the cabin body flange. After compression, the spring always maintains its elastic potential energy and continuously applies preload force to the door flange to ensure long-term fit between the door flange and the cabin body flange. When the door is further squeezed by atmospheric pressure, the spring will absorb the deformation caused by the external pressure through its own elastic deformation, avoiding the risk of extrusion damage caused by rigid connection.

[0024] The clamping mechanism drives the cam to rotate by rotating the handle. When the cam rotates, the eccentric arc segment of the cam's outer periphery rolls on the surface of the door flange, converting the cam's rotational motion into axial thrust of the door flange, and then pushing the door flange closer to the cabin flange until the straight section of the cam's outer periphery fits the end face of the door flange, forming a static self-locking and continuously maintaining the clamping state.

[0025] The present invention can reduce the risk of displacement and falling off of the sealing ring through the positioning of the sealing ring, the elastic pre-tightening of the clamping mechanism and the self-locking locking of the pressing mechanism, ensure the long-term stable operation of the vacuum container, and is suitable for sealing scenarios with high frequency opening and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the present invention Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the structure of the present invention Figure 2 ;

[0028] Figure 3 yes Figure 2 A magnified schematic diagram of point A in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of the present invention Figure 3 ;

[0030] Figure 5 yes Figure 4 Cross-sectional view at AA in the middle;

[0031] Figure 6 This is a partial structural cross-sectional view of the present invention with the pressing mechanism and the cabin removed;

[0032] Figure 7 yes Figure 6 A magnified schematic diagram of point B in the middle;

[0033] Figure 8 yes Figure 6 The enlarged schematic diagram of point C in the middle;

[0034] In the picture:

[0035] 1. Cabin body; 2. Cabin door; 201. Arc-shaped reinforcement plate; 202. Cabin door flange; 203. Upper support plate; 204. Lower support plate; 3. Cabin body flange; 4. Reinforcement short section; 5. Clamping mechanism; 501. Handle; 502. Cam; 503. Pressure rod; 6. Clamping mechanism; 601. Through shaft; 602. Spring; 6021. Upper spring; 6022. Lower spring; 603. Adjusting nut; 6031. Upper adjusting nut; 6032. Lower adjusting nut; 7. Inner pressure strip; 8. Outer pressure strip; 9. Sealing ring; 10. Pressure rod fixing seat; 11. Upper cabin body fixing seat; 12. Lower cabin body fixing seat; 13. Upper pin shaft; 14. Lower pin shaft; 15. Upper cabin door fixing seat; 16. Lower cabin door fixing seat; 17. Anti-extraction bolt; 18. Upper copper sleeve; 19. Lower copper sleeve. DETAILED DESCRIPTION

[0036] The present invention is described and illustrated in detail below with reference to the embodiments.

[0037] Example 1

[0038] like Figure 1-8As shown, the square flange flexible sealing device for a vacuum container includes a cabin 1, which is arranged in a rectangular parallelepiped as a whole. A reinforcing short section 4 is connected to the cabin 1, and a cabin flange 3 is arranged at one end of the reinforcing short section 4 away from the cabin 1. A cabin door 2 is rotatably arranged on the cabin flange 3, and the cabin door 2 includes an arc-shaped reinforcing plate 201. A cabin door flange 202 is arranged on the arc-shaped reinforcing plate 201 to cooperate with the cabin flange 3. The cabin flange 3 is arranged in a square frame as a whole, and the square frame includes a hinged frame and three free frames. The hinged frame and the three free frames are connected end to end in sequence, and the outer side surface of the free frame of the cabin flange 3 cooperates with the cabin door flange 2 02 is provided with a clamping mechanism 5, and the outer side surface of the hinged frame of the cabin flange 3 is cooperated with the cabin door flange 202 to be provided with a clamping mechanism 6, and the end surface of the cabin flange 3 is provided with an inner pressure strip 7 and an outer pressure strip 8, and a sealing ring 9 is provided between the inner pressure strip 7 and the outer pressure strip 8. The clamping mechanism 5 includes a handle 501, a cam 502 and a pressure rod 503. The clamping mechanism 5 pushes the cabin door flange 202 to fit with the cabin flange 3 through the rotation of the cam 502. The clamping mechanism 6 includes a through shaft 601, a spring 602 and an adjusting nut 603. The clamping mechanism 6 pushes the cabin door flange 202 and the cabin flange 3 to be pressed together through the spring 602 and the adjusting nut 603.

[0039] The inner and outer moldings 7 and 8 on the end faces of the cabin flange 3 form a sealing groove. When the door flange 202 and the cabin flange 3 are in contact, the sealing ring 9 is naturally clamped between the inner and outer moldings 7 and 8, preventing localized sealing failure caused by installation deviations. The inner and outer moldings 7 and 8 are fixed to the end faces of the cabin flange 3, limiting the displacement or deformation of the sealing ring 9, maintaining the stability of the sealing structure and reducing the risk of displacement of the sealing ring 9 during frequent opening and closing of the door 2.

[0040] The clamping mechanism 5 rotates with the help of the cam 502, converting the rotational motion into an axial thrust that pushes on the door flange 202, forcing it to approach and fit against the cabin flange 3. The clamping mechanism 6, through the cooperation of the spring 602 and the adjusting nut 603, converts the elastic potential energy of the spring 602 into a preload force between the door flange 202 and the cabin flange 3, ensuring long-term contact between them. The positioning of the sealing ring 9, the preload of the clamping mechanism 6, and the locking of the clamping mechanism 5 reduce the risk of the sealing ring 9 shifting or falling off, ensuring the long-term stable operation of the vacuum container and making it suitable for sealing scenarios with frequent opening and closing.

[0041] The outer side surface of the free frame of the cabin flange 3 is fixed with a pressure rod fixing seat 10 in conjunction with the clamping mechanism 5. The pressure rod fixing seat 10 is hingedly connected to the pressure rod 503. The cam 502 is rotatably set at one end of the pressure rod 503 away from the pressure rod fixing seat 10, and the handle 501 is fixedly connected to the cam 502.

[0042] The pressure rod 503 can rotate flexibly around the pressure rod fixing seat 10. When the handle 501 is rotated, the cam 502 rotates accordingly, thereby converting the rotational motion of the cam 502 into an axial thrust for pushing the door flange 202, which is convenient to operate.

[0043] The outer side surface of the hinged frame of the cabin flange 3 cooperates with the clamping mechanism 6 to fix the upper cabin fixing seat 11 and the lower cabin fixing seat 12, the upper cabin fixing seat 11 is penetrated by an upper pin shaft 13, the lower cabin fixing seat 12 is penetrated by a lower pin shaft 14, and the hatch flange 202 cooperates with the clamping mechanism 6 to fix the upper cabin door fixing seat 15 and the lower cabin door fixing seat 16.

[0044] The through shaft 601 passes through the upper hatch fixing seat 15, the upper pin shaft 13, the lower hatch fixing seat 16 and the lower pin shaft 14 in sequence. An upper copper sleeve 18 is provided between the upper hatch fixing seat 15 and the through shaft 601, and a lower copper sleeve 19 is provided between the lower hatch fixing seat 16 and the through shaft 601. An anti-extraction bolt 17 is provided at the lower end of the through shaft 601.

[0045] The upper and lower door mounts 15, 16 are fixed to the door flange 202, further stabilizing the hinged connection between the door 2 and the cabin flange 3. This also provides a reliable path for transmitting the preload force of the spring 602 and the adjustment nut 603. The through shaft 601 articulates the door flange 202 and the cabin flange 3 into a single, integrated unit, enhancing the stability of the connection. The upper and lower copper bushings 18, 19 offer excellent lubricity, reducing the friction coefficient between the through shaft 601 and the upper door mount 15, as well as between the through shaft 601 and the lower door mount 16. This reduces operational resistance and ensures smoother rotation of the door 2. The upper and lower copper bushings 18, 19 also provide stable support for the through shaft 601, ensuring it does not deflect or wobble when subjected to force. This ensures uniform and stable pressure from the clamping mechanism 6 on the door flange 202, preventing seal failure caused by skewed through shaft 601. The anti-extraction bolt 17 provided at the lower end of the through shaft 601 can prevent the through shaft 601 from being extracted during the force-bearing process, thereby ensuring the reliability of the clamping mechanism 6 .

[0046] The adjusting nut 603 includes an upper adjusting nut 6031 and a lower adjusting nut 6032. The upper adjusting nut 6031 is rotatably set on the upper pin shaft 13 and the upper adjusting nut 6031 is located at one end of the upper pin shaft 13 close to the cabin body 1. The lower adjusting nut 6032 is rotatably set on the lower pin shaft 14 and the lower adjusting nut 6032 is located at one end of the lower pin shaft 14 close to the cabin body 1.

[0047] By rotating the adjusting nut 603 , the spring 602 can be compressed, thereby adjusting the elastic potential energy of the spring 602 and further adjusting the pre-tightening force between the door flange 202 and the cabin body flange 3 .

[0048] The spring 602 includes an upper spring 6021 and a lower spring 6022 , and the upper spring 6021 and the lower spring 6022 are respectively sleeved on the upper pin shaft 13 and the lower pin shaft 14 .

[0049] One end of the upper spring 6021 is set on the upper cabin fixing seat 11, and the other end of the upper spring 6021 is set on the upper adjusting nut 6031. One end of the lower spring 6022 is set on the lower cabin fixing seat 12, and the other end of the lower spring 6022 is set on the lower adjusting nut 6032.

[0050] When adjusting nut 603 is rotated to compress spring 602, its elastic potential energy is converted into a preload force between door flange 202 and cabin flange 3. Even after compression, spring 602 maintains this elastic potential energy, continuously applying preload force to door flange 202 and ensuring a long-term fit. When door 2 is subjected to atmospheric pressure, spring 602 absorbs this external pressure through its own elastic deformation, avoiding the risk of extrusion damage caused by a rigid connection and achieving flexible preload.

[0051] The outer bead 8 is arranged close to the outer edge of the cabin flange 3 , the inner bead 7 is arranged close to the center of the cabin flange 3 , and the inner bead 7 and the outer bead 8 are arranged at intervals.

[0052] The sealing ring 9 has a circular cross-section. The thickness of the outer bead 8 is equal to 0.75 times the diameter of the sealing ring 9's cross section. The thickness of the inner bead 7 is equal to the thickness of the outer bead 8. The distance between the inner and outer bead 7, 8 is equal to 0.9 times the diameter of the sealing ring 9's cross section. When the door flange 202 is in contact with the cabin flange 3, the sealing ring 9 is trapped between the inner and outer bead 7, 8. This ensures that the sealing ring 9 is naturally tightened while preventing excessive deformation or displacement, thereby improving sealing reliability.

[0053] The cam 502 is shaped like an eccentric disk. Its outer contour consists of an eccentric arc segment and a straight segment, formed by connecting the two segments end to end. An upper support plate 203 and a lower support plate 204 are positioned between the curved reinforcement plate 201 and the door flange 202. The curved reinforcement plate 201 enhances the structural strength of the door 2, reducing deformation during frequent opening and closing or when subjected to atmospheric pressure. This prevents uneven force on the sealing ring 9 due to deformation of the door 2 and can lead to leakage, thereby ensuring the stability of the sealing performance.

[0054] Working principle and process:

[0055] 1. Door 2 Closing and Pre-Tightening Stage

[0056] The operator pushes the hatch door 2 to rotate around the through shaft 601 so that the hatch door flange 202 approaches the cabin body flange 3 until the sealing ring 9 makes preliminary contact with the hatch door flange 202 .

[0057] By rotating the upper adjusting nut 6031 and the lower adjusting nut 6032, the upper spring 6021 sleeved on the upper pin 13 and the lower spring 6022 sleeved on the lower pin 14 are compressed; the compressed upper spring 6021 and the lower spring 6022 generate elastic reaction force, the upper spring 6021 pushes the upper adjusting nut 6031 to move axially along the upper pin 13 in a direction away from the upper cabin fixing seat 11, and the lower spring 6022 pushes the lower adjusting nut 6032 to move axially along the lower pin 14 in a direction away from the lower cabin fixing seat 12;

[0058] The upper adjusting nut 6031 and the lower adjusting nut 6032 respectively drive the upper pin shaft 13 and the lower pin shaft 14 to move outward, and transmit the axial force to the hatch flange 202 through the through shaft 601, pulling the hatch flange 202 to fit against the cabin flange 3, forming an initial pre-tightening of the hatch flange 202.

[0059] 2. Clamping mechanism 5

[0060] Rotating the handle 501 drives the pressure rod 503 to swing about the pressure rod mounting 10. The cam 502 at one end of the pressure rod 503 rolls on the surface of the door flange 202. When the straight section of the cam 502's outer circumference contacts the end surface of the door flange 202, a static self-locking mechanism is formed, thereby applying a clamping force to the door flange 202. The clamping force of the clamping mechanism 5 cooperates with the preload force of the clamping mechanism 6 to achieve uniform circumferential compression between the door flange 202 and the cabin flange 3.

[0061] 3. Maintaining the seal under vacuum state

[0062] When the interior of the cabin 1 is evacuated to a vacuum, the atmospheric pressure outside the cabin 1 pushes the door flange 202 to move axially toward the cabin flange 3. The spring 602 absorbs the deformation energy between the door flange 202 and the cabin flange 3 through elastic deformation, avoiding pressure overload caused by rigid support; the clamping mechanism 5 is in a static self-locking state, continuously maintaining the circumferential clamping force, and cooperating with the axial pre-tightening force of the clamping mechanism 6 to ensure that the sealing ring 9 is evenly pressurized circumferentially.

[0063] If the equipment undergoes physical deformations such as creep, thermal expansion and contraction of the inner and outer pressure strips 7 and 8 due to vibration or temperature changes during long-term operation, the elastic retreat of the spring 602 can automatically compensate for the axial displacement between the hatch flange 202 and the cabin flange 3 to maintain the stability of the preload force; the clamping mechanism 5 can also suppress the radial displacement of the hatch flange 202 to prevent the sealing ring 9 from shifting due to vibration.

Claims

1. A square flange flexible sealing device for a vacuum container, comprising a cabin (1), wherein the cabin (1) is in the shape of a rectangular parallelepiped, and is characterized in that: A reinforcement short section (4) is connected to the cabin body (1), and a cabin flange (3) is provided at one end of the reinforcement short section (4) away from the cabin body (1). A cabin door (2) is rotatably provided on the cabin flange (3), and the cabin door (2) includes an arc-shaped reinforcement plate (201). A cabin door flange (202) is provided on the arc-shaped reinforcement plate (201) in cooperation with the cabin flange (3). The cabin flange (3) is arranged in a square frame as a whole, and the square frame includes a hinged frame and three free frames, and the hinged frame and the three free frames are connected end to end in sequence. A pressing mechanism (5) is provided on the outer side surface of the free frame of the cabin flange (3) in cooperation with the cabin door flange (202). The outer side surface of the hinged frame of the cabin flange (3) is in cooperation with the cabin door The flange (202) is provided with a clamping mechanism (6), an inner pressure strip (7) and an outer pressure strip (8) are provided on the end surface of the cabin flange (3), a sealing ring (9) is provided between the inner pressure strip (7) and the outer pressure strip (8), the clamping mechanism (5) includes a handle (501), a cam (502) and a pressure rod (503), the clamping mechanism (5) rotates through the cam (502) to push the cabin door flange (202) and the cabin flange (3) to fit together, the clamping mechanism (6) includes a through shaft (601), a spring (602) and an adjusting nut (603), the clamping mechanism (6) pushes the cabin door flange (202) and the cabin flange (3) to be pressed together through the spring (602) and the adjusting nut (603).

2. The square flange flexible sealing device for a vacuum container according to claim 1, characterized in that: A pressure rod fixing seat (10) is fixedly provided on the outer side surface of the free frame of the cabin flange (3) in cooperation with the pressing mechanism (5), the pressure rod fixing seat (10) is hingedly connected to the pressure rod (503), the cam (502) is rotatably provided at one end of the pressure rod (503) away from the pressure rod fixing seat (10), and the handle (501) is fixedly connected to the cam (502).

3. The square flange flexible sealing device for a vacuum container according to claim 1, characterized in that: An upper cabin fixing seat (11) and a lower cabin fixing seat (12) are fixedly provided on the outer side surface of the hinged frame of the cabin flange (3) in cooperation with the clamping mechanism (6); an upper pin shaft (13) is provided through the upper cabin fixing seat (11); a lower pin shaft (14) is provided through the lower cabin fixing seat (12); and an upper cabin door fixing seat (15) and a lower cabin door fixing seat (16) are fixedly provided on the cabin door flange (202) in cooperation with the clamping mechanism (6).

4. The square flange flexible sealing device for a vacuum container according to claim 3, characterized in that: The through shaft (601) sequentially passes through the upper hatch door fixing seat (15), the upper pin shaft (13), the lower hatch door fixing seat (16) and the lower pin shaft (14), an upper copper sleeve (18) is provided between the upper hatch door fixing seat (15) and the through shaft (601), a lower copper sleeve (19) is provided between the lower hatch door fixing seat (16) and the through shaft (601), and an anti-extraction bolt (17) is provided at the lower end of the through shaft (601).

5. The square flange flexible sealing device for a vacuum container according to claim 3, characterized in that: The adjusting nut (603) includes an upper adjusting nut (6031) and a lower adjusting nut (6032), wherein the upper adjusting nut (6031) is rotatably mounted on the upper pin shaft (13) and is located at one end of the upper pin shaft (13) close to the cabin body (1), and the lower adjusting nut (6032) is rotatably mounted on the lower pin shaft (14) and is located at one end of the lower pin shaft (14) close to the cabin body (1).

6. The flexible sealing device for square flange of vacuum container according to claim 5, characterized in that: The spring (602) comprises an upper spring (6021) and a lower spring (6022), and the upper spring (6021) and the lower spring (6022) are respectively sleeved on the upper pin shaft (13) and the lower pin shaft (14).

7. The flexible sealing device for square flange of vacuum container according to claim 6, characterized in that: One end of the upper spring (6021) is arranged on the upper cabin fixing seat (11), and the other end of the upper spring (6021) is arranged on the upper adjustment nut (6031). One end of the lower spring (6022) is arranged on the lower cabin fixing seat (12), and the other end of the lower spring (6022) is arranged on the lower adjustment nut (6032).

8. The flexible sealing device for square flange of vacuum container according to claim 1, characterized in that: The outer bead (8) is arranged close to the outer edge of the cabin flange (3), the inner bead (7) is arranged close to the center of the cabin flange (3), and the inner bead (7) and the outer bead (8) are arranged at intervals.

9. The square flange flexible sealing device for a vacuum container according to claim 8, characterized in that: The cross section of the sealing ring (9) is circular, the thickness of the outer bead (8) is equal to 0.75 times the diameter of the cross section of the sealing ring (9), the thickness of the inner bead (7) is equal to the thickness of the outer bead (8), and the distance between the inner bead (7) and the outer bead (8) is equal to 0.9 times the diameter of the cross section of the sealing ring (9).

10. The flexible sealing device for square flange of vacuum container according to claim 1, characterized in that: The cam (502) is arranged in an eccentric disc shape as a whole. The outer peripheral profile of the cam (502) includes an eccentric arc segment and a straight segment. The outer peripheral profile of the cam (502) is formed by connecting the eccentric arc segment and the straight segment end to end. An upper support plate (203) and a lower support plate (204) are arranged between the arc-shaped reinforcement plate (201) and the door flange (202).

Images