A hatch cover

Abstract

The present application relates to a hatch cover, which includes: a fence, a cylinder head, a sealing assembly, a slewing ring, and a locking assembly, wherein the cylinder head is detachably connected to the fence; the sealing assembly includes a sealing strip, which is provided on the cylinder head; the slewing ring is sleeved on the outer peripheral surface of the fence, and the slewing ring is provided with a pressing member; the locking assembly is connected to the slewing ring and is used to drive the slewing ring to move relative to the fence; wherein the fence has a first position and a second position, wherein when the slewing ring moves to the first position, the pressing member abuts against the top of the cylinder head to apply a pre-tightening force to the sealing strip so that the sealing strip fits against the top of the fence, and when the slewing ring moves to the second position, the pressing member separates from the cylinder head. In the present invention, when the cylinder head is closed, the pressing member on the slewing ring abuts against the top of the cylinder head, which can apply a pre-tightening force to the sealing strip, thereby ensuring the sealing of the cylinder head. When the cylinder head is subjected to reverse pressure, the pressing member presses the cylinder head tightly, so that the cylinder head can withstand the internal pressure without deformation or separation from the fence.

Description

Technical Field

[0001] The present application relates to the field of ship system outfitting parts, and in particular to a hatch cover. Background Art

[0002] The main function of the hatch cover is to serve as a connection for personnel to enter and exit the cabin and as part of the bulkhead pressure boundary to prevent seawater from entering the cabin. The existing standard hatch cover is suitable for positive pressure bearing, and the operating conditions are external pressures of 4.5MPa and 3.0MPa. Both are pressure-bearing on the convex surface of the hatch cover cylinder head, but cannot be used for reverse pressure bearing. If reverse pressure is applied, the cylinder head and slewing ring will be subjected to tensile stress, causing the sealing surface between the sealing ring and the fence to detach, resulting in leakage. Summary of the Invention

[0003] An embodiment of the present application provides a hatch cover to solve the problem in the related art that a hatch cover may leak when subjected to reverse pressure.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a hatch cover, comprising: a fence, a cylinder head, a sealing assembly, a slewing ring and a locking assembly, wherein the cylinder head is detachably connected to the fence; the sealing assembly comprises a sealing strip, which is arranged on the cylinder head; the slewing ring is sleeved on the outer peripheral surface of the fence, and a pressing piece is provided on the slewing ring; the locking assembly is connected to the slewing ring and is used to drive the slewing ring to move relative to the fence; wherein the fence has a first position and a second position, and when the slewing ring moves to the first position, the pressing piece is held against the top of the cylinder head to apply a pre-tightening force to the sealing strip so that the sealing strip fits with the top of the fence, and when the slewing ring moves to the second position, the pressing piece is separated from the cylinder head.

[0005] In some embodiments, the sealing strip has a U-shaped cross-section; the sealing assembly further includes: a sealing groove and a fastener, the sealing groove is arranged at the bottom of the cylinder head, and the sealing strip is arranged in the sealing groove; the fastener is detachably connected to the inner wall of the sealing groove, and forms an accommodating space between the fastener and the sealing groove, the sealing strip is placed in the accommodating space, and the top end of the sealing strip is in contact with the inner wall of the sealing groove, and the bottom end is in contact with the top end of the fence.

[0006] In some embodiments, the pressing parts are arranged at intervals on the inner wall of the rotating ring, and the outer peripheral surface of the cylinder head is provided with matching parts at intervals; when the rotating ring moves to the first position, the bottom end of the pressing part at least partially overlaps with the top end of the matching part, and when the rotating ring moves to the second position, the pressing part is separated from the matching part.

[0007] In some embodiments, the locking assembly includes a first transmission mechanism and a second transmission mechanism, the first transmission mechanism is arranged on the fence, the second transmission mechanism is arranged on the slewing ring, and the first transmission mechanism is used to drive the second transmission mechanism and the slewing ring to move relative to the fence.

[0008] In some embodiments, the first transmission mechanism includes: a gear box, a transmission shaft and a first gear, the gear box is fixedly connected to the fence surface; the transmission shaft is rotatably connected to the gear box; and the first gear is sleeved on the transmission shaft.

[0009] In some embodiments, the second transmission mechanism includes a rack fixedly connected to the outer peripheral surface of the rotary ring, and the rack is engaged with the first gear.

[0010] In some embodiments, the locking assembly also includes a third transmission mechanism, which is arranged on the fence, with one end placed inside the fence and the other end placed outside the fence. The third transmission mechanism is used to drive the first transmission mechanism to move, so that the first transmission mechanism drives the second transmission mechanism and the slewing ring to move.

[0011] In some embodiments, the first transmission mechanism also includes a second gear, which is fixed to the transmission shaft; the third transmission mechanism includes a rotating shaft and a bevel gear, one end of the rotating shaft is placed inside the fence, and the other end is placed outside the fence, and is rotatably connected to the fence; the bevel gear is fixedly connected to the rotating shaft and is located outside the fence, and the bevel gear is engaged with the second gear.

[0012] In some embodiments, the hatch cover further includes a hinge assembly, one end of the hinge assembly is fixed to the fence, and the other end is fixed to the cylinder cover, for opening and closing the cylinder cover.

[0013] In some embodiments, the hinge assembly includes: a base, a cover hinge, a bushing and a connecting piece, wherein the base is fixed to the fence surface; the cover hinge is fixed to the base; the bushing is fixed to one end of the cover hinge; one end of the connecting piece is rotatably connected to the bushing, and the other end is fixed to the cylinder head.

[0014] The beneficial effects of the technical solution provided by this application include:

[0015] An embodiment of the present application provides a hatch cover, which drives a slewing ring to move through a locking assembly. When the slewing ring moves to the first position, the cylinder cover is closed, and the pressing piece on the slewing ring is pressed against the top of the cylinder cover, which can apply a pre-tightening force to the sealing strip, thereby ensuring the sealing of the cylinder cover. At the same time, when the cylinder cover is under reverse pressure, the pressing piece presses the cylinder cover tightly, so that the cylinder cover can withstand the internal pressure without deformation or separation from the fence, thereby ensuring the sealing performance of the cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the cylinder head structure provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of a fence structure provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of the slewing ring structure provided in an embodiment of the present application;

[0021] Figure 5 A schematic diagram of the hinge assembly structure provided in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of the structure of the first transmission mechanism provided in an embodiment of the present application;

[0023] Figure 7 A schematic diagram of the sealing assembly structure provided in an embodiment of the present application;

[0024] Figure 8 Schematic diagram of the sealing strip structure provided in an embodiment of the present application.

[0025] In the figure: 1, cylinder head; 10, cover shell; 11, matching part; 12, handle;

[0026] 2. Fence; 20. Through hole; 21. Positioning plate; 22. Threaded groove;

[0027] 3. Rotary ring; 30. Pressed parts;

[0028] 4. Hinge assembly; 40. Cover hinge; 41. Base; 42. Bushing; 43. Connector;

[0029] 5. Locking assembly; 50. First transmission mechanism; 500. First gear; 501. Transmission shaft; 502. Gearbox; 503. Second gear; 51. Second transmission mechanism; 510. Rack; 52. Third transmission mechanism; 520. Rotating shaft; 521. Bevel gear;

[0030] 6. Sealing assembly; 60. Sealing strip; 61. Sealing groove; 62. Fastener; 620. Press ring; 621. Bolt. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] An embodiment of the present application provides a hatch cover that can solve the problem in the related art that a hatch cover may leak when subjected to reverse pressure.

[0033] See also Figures 1 to 8 , an embodiment of the present application provides a hatch cover, which includes: a fence 2, a cylinder head 1, a sealing assembly 6, a slewing ring 3 and a locking assembly 5, the cylinder head 1 is detachably connected to the fence 2; the sealing assembly 6 includes a sealing strip 60, and the sealing strip 60 is arranged on the cylinder head 1; the slewing ring 3 is sleeved on the outer peripheral surface of the fence 2, and a pressing part 30 is provided on the slewing ring 3; the locking assembly 5 is connected to the slewing ring 3 and is used to drive the slewing ring 3 to move relative to the fence 2; wherein, the fence 2 has a first position and a second position, when the slewing ring 3 moves to the first position, the pressing part 30 is held against the top of the cylinder head 1 to apply a pre-tightening force to the sealing strip 60, so that the sealing strip 60 fits with the top of the fence 2, and when the slewing ring 3 moves to the second position, the pressing part 30 is separated from the cylinder head 1.

[0034] In the present application, the rotating ring 3 is driven to move by the locking assembly 5. When the rotating ring 3 moves to the first position, the cylinder head 1 is closed, and the pressing piece 30 on the rotating ring 3 is pressed against the top of the cylinder head 1, which can apply a pre-tightening force to the sealing strip 60, thereby ensuring the sealing of the cylinder head 1. At the same time, when the cylinder head 1 is under reverse pressure, the pressing piece 30 presses the cylinder head 1 tightly, so that the cylinder head 1 can withstand the internal pressure without deformation or separation from the fence 2, thereby ensuring the sealing performance of the cabin.

[0035] In order to further improve the sealing performance of the device, the cross section of the sealing strip 60 is set to be U-shaped. Figure 8 The cross section of the sealing strip 60 cut in the middle X direction is shown. The sealing assembly 6 further includes a sealing groove 61 and a fastener 62. The sealing groove 61 is provided at the bottom of the cylinder head 1, and the sealing strip 60 is disposed within the sealing groove 61. The fastener 62 is detachably connected to the inner wall of the sealing groove 61, and forms an accommodation space between the fastener 62 and the sealing groove 61. The sealing strip 60 is disposed within the accommodation space, with the top end of the sealing strip 60 abutting against the inner wall of the sealing groove 61 and the bottom end abutting against the top of the fence 2.

[0036] The cylinder head 1 includes a cover shell 10 and a handle 12. The handle 12 is fixed to the outer surface of the cover shell 10. The cover shell 10 and the handle 12 are made of a hard material, such as high-strength steel 607A, which is cast. The minimum yield strength of 607A is 510 MPa. The calculated wall thickness of the cover shell 10 is calculated using finite element software. The safety factor is n (n>1). The calculated wall thickness of the cover shell 10 is multiplied by the safety factor to obtain the designed wall thickness of the cover shell 10. Preferably, the safety factor is 3, and the designed wall thickness of the cover shell 10 is 50 mm. The interior of the cover shell 10 is recessed toward the handle 12. To improve the structural strength and rigidity of the cover shell 10, reinforcing ribs are fixedly connected to the concave surface inside the cover shell 10.

[0037] Fence 2 is made of a hard material, such as a monolithic forged piece of high-strength 925A steel. 925A has a minimum yield strength of 510 MPa and a tensile strength of 640 MPa, meeting the required internal pressure of 6.75 MPa without deformation or leakage. During design, the light-transmitting dimension of fence 2 must be determined. This dimension is the inner diameter of the fence that ensures unimpeded passage of personnel and equipment. Preferably, this dimension is 600 mm.

[0038] The sealing groove 61 can be a groove opened on the inner wall of the cover shell 10 for accommodating the sealing strip 60, or it can be a component fixed on the inner wall of the cover shell 10, which has an accommodating cavity for accommodating the sealing strip 60, so the component can be called "sealing groove 61".

[0039] In this application, a soft sealing structure is adopted, that is, a sealing strip 60 is embedded in the sealing groove 61. In order to further limit the sealing strip 60, a fastener 62 is used to fix the sealing strip 60. The material of the sealing strip 60 is WA7443. Specifically, the fastener 62 includes a pressure ring 620 and a bolt 621. A threaded hole is provided on the pressure ring 620 to be threadedly connected to the bolt 621. When the sealing groove 61 is a groove provided on the inner wall of the cover shell 10, a threaded hole needs to be provided on the inner wall of the cover shell 10. When the threaded hole on the pressure ring 620 corresponds to the threaded hole on the cover shell 10, the pressure ring 620 is fixed to the cover shell 10 by the bolt 621; when the sealing groove 61 is a component fixed on the inner wall of the cover shell 10, a threaded hole needs to be provided on the sealing groove 61. When the threaded hole on the pressure ring 620 corresponds to the threaded hole on the sealing groove 61, the pressure ring 620 is fixed to the sealing groove 61 by the bolt 621.

[0040] In order to adapt to the sealing strip 60 with a U-shaped cross section, a pressure ring 620 is provided, which includes an outer ring and an inner ring. The inner ring is fixed to the inner wall of the outer ring. The height of the inner ring is greater than that of the outer ring, so that the inner and outer rings are stepped. For ease of understanding, the sealing strip 60 is provided to include a top component, a bottom component, and a side component. The top component and the bottom component are respectively fixed to the top and bottom ends of the side components to form a sealing strip 60 with a U-shaped cross section. Due to the height difference between the inner ring and the outer ring, after the pressure ring 620 is connected to the sealing groove 61, an accommodating space is formed between the inner wall of the sealing groove 61 and the outer ring. The accommodating space is used to accommodate the top component and can clamp the top component. Since a cavity is formed between the top component and the bottom component, the outer ring can be embedded in the cavity. Through the inner and outer rings, the sealing strip 60 can be fixed perpendicular to the axial direction of the fence 2 and in the axial direction parallel to the fence 2.

[0041] In some embodiments, as Figure 7 As shown, the thickness of the cover shell 10 is set to be smaller than the thickness of the fence 2, so that the top end of the sealing strip 60 fits with the inner wall of the sealing groove 61, and the bottom end fits with the top end of the fence 2;

[0042] In some other possible embodiments, one side of the bottom member is extended away from the central axis of the cover shell 10 , and when the cylinder head 1 is closed, the bottom member is located between the cover shell 10 and the fence 2 ;

[0043] In some possible embodiments, the thickness of the cover shell 10 is equal to the thickness of the fence 2. When the cylinder head 1 is closed, the bottom part is located below the connection between the cover shell 10 and the fence 2, so the side part can seal the connection between the cover shell 10 and the fence 2.

[0044] The above embodiments are merely examples of various possible implementations of the present invention and are not intended to be limiting. Regardless of the implementation, when the hatch opening is sealed by internal pressure, the medium acts on the inner wall of the sealing strip 60, thereby tightening the sealing strip 60 and further improving sealing reliability.

[0045] On the basis of the above embodiments, in this embodiment, the pressing parts 30 are arranged at intervals on the inner wall of the rotating ring 3, and the fitting parts 11 are arranged at intervals on the outer peripheral surface of the cylinder head 1; when the rotating ring 3 moves to the first position, the bottom end of the pressing part 30 at least partially overlaps with the top end of the fitting part 11, and when the rotating ring 3 moves to the second position, the pressing part 30 is separated from the fitting part 11.

[0046] The slewing ring 3 is made of a cast copper alloy using a metal mold casting process. The minimum tensile strength of the cast copper alloy is 440 MPa. A mating piece 11 is provided on the outer peripheral surface of the cover shell 10. The distance between two adjacent mating pieces 11 is greater than the length of the pressing piece 30. Both the pressing piece 30 and the mating piece 11 are wedge-shaped blocks. When the slewing ring 3 moves to the first position, the cover shell 10 abuts against the top of the fence 2, and the pressing piece 30 at least partially overlaps with the top of the mating piece 11, thereby applying a preload force to the sealing strip 60. The first position herein can refer to the position of the slewing ring 3 when the upper third of the pressing piece 30 overlaps with the top of the mating piece 11, or it can refer to the position of the slewing ring 3 when the entire pressing piece 30 overlaps with the top of the mating piece 11. When the slewing ring 3 moves to the second position, the pressing piece 30 separates from the mating piece 11. After the pressing element 30 is separated from the mating element 11, no matter which position the slewing ring 3 is in, that position is the second position. It is sufficient to ensure that the pressing element 30 and the mating element 11 are not in contact with each other when the slewing ring 3 moves to the second position. The separation of the slewing ring 3 at this point can mean that the slewing ring 3 moves away from the fence 2, directly separating the slewing ring 3 from the fence 2. It can also mean that the slewing ring 3 rotates through a set angle so that each pressing element 30 is located between two adjacent mating elements 11 at the corresponding position, and neither side of the pressing element 30 contacts the mating elements 11.

[0047] Based on the above embodiments, in this embodiment, the locking assembly 5 includes a first transmission mechanism 50 and a second transmission mechanism 51. The first transmission mechanism 50 is arranged on the fence 2, and the second transmission mechanism 51 is arranged on the slewing ring 3. The first transmission mechanism 50 is used to drive the second transmission mechanism 51 and the slewing ring 3 to move relative to the fence 2.

[0048] In this embodiment, the first transmission mechanism 50 and the second transmission mechanism 51 are used to open and close the cylinder head 1. The movement mode of the second transmission mechanism 51 and the slewing ring 3 relative to the fence 2 can be translation along the axial direction of the fence 2, or translation along the axial direction of the fence 2 while rotating.

[0049] Specifically, the first transmission mechanism 50 includes a gearbox 502, a transmission shaft 501, and a first gear 500. The gearbox 502 is fixedly connected to the surface of the fence 2; the transmission shaft 501 is rotatably connected to the gearbox 502; and the first gear 500 is sleeved on the transmission shaft 501. The second transmission mechanism 51 includes a rack 510, which is fixedly connected to the outer circumference of the slewing ring 3 and meshes with the first gear 500.

[0050] In some possible embodiments, the rack 510 is as follows Figure 1As shown, when the axial direction of the first gear 500 arranged around the outer circumference of the slewing ring 3 is aligned with the axial direction of the fence 2, the second transmission mechanism 51 and the slewing ring 3 translate and rotate along the axial direction of the fence 2. In this case, a threaded groove 22 is provided on the outer circumference of the fence 2, and a threaded groove 22 is provided on the inner wall of the slewing ring 3 to thread the fence 2 and slewing ring 3 together. A handle can be installed on the transmission shaft 501 to convert the force of the handle into the circumferential rotational force of the slewing ring 3. When the cylinder head 1 is closed, the engagement between the pressing member 30 on the slewing ring 3 and the mating member 11 on the cover shell 10 provides sealing pressure, thereby achieving a seal for the sealing strip 60.

[0051] In other possible embodiments, the length extension direction of the rack 510 is the same as the axial direction of the fence 2. When the axial direction of the first gear 500 is perpendicular to the axial direction of the fence 2, the movement mode of the slewing ring 3 relative to the fence 2 is translation along the axial direction of the fence 2. The rotating handle drives the transmission shaft 501 to rotate, and then the first gear 500 rotates. The rotation of the first gear 500 drives the slewing ring 3 and the rack 510 to translate along the axial direction of the fence 2.

[0052] Based on the above embodiment, in this embodiment, the locking assembly 5 also includes a third transmission mechanism 52, which is arranged on the fence 2, with one end placed inside the fence 2 and the other end placed outside the fence 2. The third transmission mechanism 52 is used to drive the first transmission mechanism 50 to move, so that the first transmission mechanism 50 drives the second transmission mechanism 51 and the slewing ring 3 to move.

[0053] One end of the third transmission mechanism 52 is disposed within the fence 2. The third transmission mechanism 52 and the second transmission mechanism 51 enable manual opening and closing of the cylinder cover 1 from both inside and outside the hatch cover. Specifically, the first transmission mechanism 50 further includes a second gear 503, which is fixed to the transmission shaft 501. The third transmission mechanism 52 includes a rotating shaft 520 and a bevel gear 521. The fence 2 is provided with a through hole 20, and the rotating shaft 520 extends through the through hole 20. One end of the rotating shaft 520 is disposed within the fence 2, and the other end is disposed outside the fence 2, and is rotatably connected to the fence 2. The bevel gear 521 is fixedly connected to the rotating shaft 520 and is located outside the fence 2. The bevel gear 521 meshes with the second gear 503.

[0054] When the cylinder cover 1 is opened and closed from the inside of the fence 2, the rotating shaft 520 is rotated, so that the rotating shaft 520 drives the bevel gear 521 to rotate, and then the bevel gear 521 drives the second gear 503 to rotate. When the second gear 503 rotates, it can drive the transmission shaft 501 to rotate, thereby causing the slewing ring 3 to move.

[0055] On the basis of the above embodiment, in this embodiment, in order to facilitate the opening and closing of the cylinder cover 1, the hatch cover is further provided with a hinge assembly 4, one end of the hinge assembly 4 is fixed to the fence 2, and the other end is fixed to the cylinder cover 1 for opening and closing the cylinder cover 1.

[0056] Specifically, the hinge assembly 4 includes: a base 41, a cover hinge 40, a bushing 42 and a connector 43. The base 41 is fixed to the surface of the fence 2; the cover hinge 40 is fixed to the base 41; the bushing 42 is fixed to one end of the cover hinge 40; one end of the connector 43 is rotatably connected to the bushing 42, and the other end is fixed to the cylinder head 1. A positioning plate 21 is provided on the surface of the fence 2, and the base 41 is mounted on the positioning plate 21. When the connector 43 is welded to the top of the cover shell 10 to open and close the cylinder head 1, the connector 43 rotates relative to the bushing 42. It is also necessary to set a minimum opening angle of the cylinder head 1, that is, the minimum rotation angle of the connector 43. When the opening angle of the cylinder head 1 is greater than or equal to the minimum angle, it can ensure that personnel and equipment can enter and exit the interior of the fence without obstacles. Preferably, the minimum opening angle of the cylinder head 1 is set to 105°.

[0057] In summary, the hatch cover is made of new materials with stable physical properties. It can withstand reverse pressure, has a compact and reliable structure, and features a long lifespan, easy assembly and disassembly, and a highly reliable seal. Furthermore, during the design phase, a combination of calculation formulas and structural stress analysis software optimized the overall structure of the equipment, achieving an optimal balance between structure and weight. This effectively reduces the weight of the equipment while ensuring functionality and reliability.

[0058] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0059] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0060] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A hatch cover, characterized in that: It includes: Fence (2); A cylinder cover (1), the cylinder cover (1) being detachably connected to the fence (2); A sealing assembly (6), the sealing assembly (6) comprising a sealing strip (60), the sealing strip (60) being arranged on the cylinder head (1); A slewing ring (3), the slewing ring (3) is sleeved on the outer peripheral surface of the fence (2), and a pressing piece (30) is provided on the slewing ring (3); A locking assembly (5), the locking assembly (5) being connected to the slewing ring (3) and being used to drive the slewing ring (3) to move relative to the fence (2); The fence (2) has a first position and a second position. When the rotating ring (3) moves to the first position, the pressing member (30) abuts against the top of the cylinder head (1) to apply a pre-tightening force to the sealing strip (60) so that the sealing strip (60) fits the top of the fence (2). When the rotating ring (3) moves to the second position, the pressing member (30) separates from the cylinder head (1). The sealing strip (60) has a U-shaped cross section; The sealing assembly (6) further comprises: A sealing groove (61), wherein the sealing groove (61) is provided at the bottom of the cylinder head (1), and the sealing strip (60) is provided in the sealing groove (61); A fastener (62), the fastener (62) being detachably connected to the inner wall of the sealing groove (61) and forming an accommodation space between the fastener and the sealing groove (61), the sealing strip (60) being placed in the accommodation space, and the top end of the sealing strip (60) being in contact with the inner wall of the sealing groove (61), and the bottom end being in contact with the top end of the fence (2); The pressing parts (30) are arranged at intervals on the inner wall of the rotary ring (3), and the outer peripheral surface of the cylinder head (1) is provided with matching parts (11) at intervals; When the rotating ring (3) moves to the first position, the bottom end of the pressing member (30) at least partially overlaps with the top end of the matching member (11); when the rotating ring (3) moves to the second position, the pressing member (30) separates from the matching member (11); The locking assembly (5) comprises a first transmission mechanism (50) and a second transmission mechanism (51), wherein the first transmission mechanism (50) is arranged on the fence (2), and the second transmission mechanism (51) is arranged on the slewing ring (3), and the first transmission mechanism (50) is used to drive the second transmission mechanism (51) and the slewing ring (3) to move relative to the fence (2).

2. The hatch cover according to claim 1, wherein The first transmission mechanism (50) comprises: A gear box (502), the gear box (502) being fixedly connected to the surface of the fence (2); a transmission shaft (501), the transmission shaft (501) being rotatably connected to the gear box (502); A first gear (500) is sleeved on the transmission shaft (501).

3. The hatch cover according to claim 2, wherein: The second transmission mechanism (51) comprises a rack (510), the rack (510) being fixedly connected to the outer peripheral surface of the rotary ring (3), and the rack (510) being meshed with the first gear (500).

4. The hatch cover according to claim 2, wherein: The locking assembly (5) further includes a third transmission mechanism (52), which is arranged on the fence (2), with one end of the third transmission mechanism being located inside the fence (2) and the other end being located outside the fence (2). The third transmission mechanism (52) is used to drive the first transmission mechanism (50) to move, so that the first transmission mechanism (50) drives the second transmission mechanism (51) and the slewing ring (3) to move.

5. The hatch cover according to claim 4, characterized in that: The first transmission mechanism (50) further includes a second gear (503), and the second gear (503) is fixed to the transmission shaft (501); The third transmission mechanism (52) comprises: A rotating shaft (520), one end of the rotating shaft (520) is placed inside the fence (2), the other end is placed outside the fence (2), and is rotatably connected to the fence (2); A bevel gear (521) is fixedly connected to the rotating shaft (520) and is located outside the fence (2). The bevel gear (521) is meshed with the second gear (503).

6. The hatch cover according to claim 1, wherein: The hatch cover also includes a hinge assembly (4), one end of the hinge assembly (4) is fixed to the fence (2), and the other end is fixed to the cylinder cover (1), and is used for opening and closing the cylinder cover (1).

7. The hatch cover according to claim 6, characterized in that The hinge assembly (4) comprises: A base (41), wherein the base (41) is fixed to the surface of the fence (2); a cover hinge (40), wherein the cover hinge (40) is fixed to the base (41); a bushing (42) fixed to one end of the cover hinge (40); A connecting member (43), one end of the connecting member (43) is rotatably connected to the bushing (42), and the other end is fixed to the cylinder head (1).

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