CN111153040B

CN111153040B - Combined sealing cover

Info

Publication number: CN111153040B
Application number: CN202010059351.5A
Authority: CN
Inventors: 周杰; 王兆君; 刘兴民; 李立永; 陈秀梅; 胡明; 于鸿胜; 乔东; 谭超
Original assignee: Qinhuangdao Tianqin Equipment Manufacturing Co ltd
Current assignee: Qinhuangdao Tianqin Equipment Manufacturing Co ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2021-07-30
Anticipated expiration: 2040-01-19
Also published as: CN111153040A

Abstract

The invention discloses a combined sealing cover which comprises a cover body, a sealing ring and a gland, wherein an inward convex edge extending inwards is arranged at the bottom of the sealing ring, the sealing ring is sleeved on the cover body, the cover body is fixedly connected with the gland, and the inward convex edge is clamped between the lower end surface of the cover body and the upper end surface of the outer edge at the bottom of the gland. The combined sealing cover is used for sealing the ammunition packaging barrel, adopts a combined structure, the cover body and the gland are tightly matched to fix the sealing ring, the structure is reliable, the bearing capacity is strong, the sealing ring is tightly matched with the ammunition packaging barrel, and the sealing effect is good; the cover body is provided with a hole and a sealing plug which is detachably connected, so that the problem that the ammunition packaging barrel is difficult to open due to negative pressure generated in the ammunition packaging barrel is avoided, and the ammunition packaging barrel is convenient to open; the draw-insert type carrying handle on the cover body enables the sealing cover to be convenient for compressing and opening, and is convenient for sealing and opening the ammunition packaging barrel.

Description

Combined sealing cover

Technical Field

The present invention relates to the field of ammunition packaging, and more particularly, to a composite seal cover.

Background

Ammunition is used as a terminal subsystem for directly completing various combat missions in a weapon system, plays an important role in war and has an important position in ordnance equipment. Ammunition is flammable and explosive dangerous material, has large consumption, ensures that the ammunition can fully exert the use value of the ammunition, protects the ammunition from or is less influenced by the external natural environment and the mechanical environment, ensures the storage safety and the transportation safety of the ammunition, improves the capability of rapidly identifying different ammunitions, and has to adopt an effective packaging method for the ammunition. Scientific ammunition package can not only effectively protect ammunition, minimize the influence that receives under the erosion of different environment, delay the quality change of ammunition, but also can realize the quick loading and unloading and the transportation operation of ammunition, improve the guarantee ability of ammunition during the war.

The sealing performance of the ammunition package is particularly important in the aspect of the protection performance of the ammunition package, and on one hand, the good sealing performance can fully isolate the ammunition from severe environments such as moisture and the like, so that the long-term storage of the ammunition is realized; on the other hand, the requirement of the ammunition on the storage environment can be reduced, the survival capacity of the ammunition is improved, and the stability of the quality of the ammunition is ensured. The current common ammunition packaging mode is as follows: firstly, the warhead is subjected to antistatic treatment, then ammunition is placed in a sealed glass fiber reinforced plastic cylinder or an iron sheet cylinder or a plastic cylinder, finally, a packaging cylinder filled with the ammunition is placed in a packaging box, and repeated fixation is carried out to complete the packaging of the ammunition. The sealing of the packaging barrel is realized by covering the packaging barrel with a sealing cover, the sealed packaging barrel can meet the long-term storage requirement of ammunition under different regional climatic conditions, and the reliable sealing of the ammunition can be ensured for more than 15 years; and the operation is simple, the sealing cover is convenient to open, the bullet loading and taking are convenient and reliable, and the sealing cover is convenient to cover and open when the bullet is heavier and longer.

Meanwhile, before ammunition storage and transportation, the air tightness and the pressure bearing capacity of the sealed ammunition packaging barrel need to be detected, during detection, the sealed packaging barrel is placed in a large sealed container, the air tightness and the pressure bearing capacity of the sealed packaging barrel are detected after the container is subjected to negative pressure pumping treatment, and therefore the sealing cover is required to have good tightness and pressure bearing capacity on the packaging barrel.

In view of the foregoing, there is a need for a sealing cap that has a good sealing effect, a high pressure-bearing capacity, and is easy to close and open.

Disclosure of Invention

In view of the particularity and special requirements of ammunition packaging, the invention innovatively provides a combined sealing cover which adopts a combined structure and comprises a cover body, a sealing ring and a pressing cover, wherein the cover body and the pressing cover are tightly matched to fix the sealing ring; the cover body is provided with a hole and a sealing plug which is detachably connected, so that the problem that the ammunition packaging barrel is difficult to open due to negative pressure generated in the ammunition packaging barrel is avoided, and the ammunition packaging barrel is convenient to open; the draw-insert type carrying handle on the cover body enables the sealing cover to be convenient for compressing and opening, and is convenient for sealing and opening the ammunition packaging barrel.

In order to achieve the technical purpose, the invention discloses a combined sealing cover which comprises a cover body, a sealing ring and a gland, wherein an inward convex edge extending inwards is arranged at the bottom of the sealing ring, the sealing ring is sleeved on the cover body, the cover body is fixedly connected with the gland, and the inward convex edge is clamped between the lower end face of the cover body and the upper end face of the outer edge at the bottom of the gland.

Furthermore, the cover body comprises an integrally formed cover body and a first connecting body, the cover body is arranged above the first connecting body, the gland comprises an integrally formed second connecting body and a gland body, the second connecting body is arranged above the gland body, the outer side surface of the gland body extends outwards to form the outer edge of the bottom of the gland, the sealing ring is sleeved on the first connecting body of the cover body, the first connecting body of the cover body is sleeved on the second connecting body of the gland, and the inner convex edge of the sealing ring is clamped between the lower end face of the first connecting body and the upper end face of the outer edge of the gland body.

Furthermore, a vent hole is formed in the cover body, a sealing plug is detachably connected to the vent hole, a first center hole is formed in the gland body, and a second center hole communicated with the first center hole is formed in the second connector.

Furthermore, a plurality of tooth-shaped bulges are arranged on the outer surface of the sealing ring.

Furthermore, the lower surface edge of the cover body is provided with a protrusion extending downwards, the cover body covers the first connecting body, the middle upper part of the sealing ring is provided with an outward protruding edge extending outwards, the outward protruding edge is arranged above the plurality of tooth-shaped protrusions, the top of the sealing ring is embedded between the inner side surface of the protrusion and the outer side surface of the first connecting body, and the upper end surface of the outward protruding edge is attached to the lower end surface of the protrusion.

Furthermore, the first connecting body is in threaded connection with the second connecting body, the first connecting body is provided with an internal thread, and the second connecting body is provided with an external thread matched with the internal thread.

Furthermore, the combined sealing cover also comprises a carrying handle, and the carrying handle is connected with the cover body in a sliding manner.

Further, the carrying handle is the U type, includes horizontal pole and two montants, it is provided with the mount to cover body top, the mount cover the body with first connector integrated into one piece, the mount includes integrated into one piece's fixed frame and crossbeam, the crossbeam sets up inside the fixed frame, the last two first through-holes that are equipped with of fixed frame, be equipped with two second through-holes on the crossbeam, the horizontal pole setting of carrying handle is in fixed frame's outside, two montants of carrying handle pass first through-hole and second through-hole respectively in proper order, two montants of carrying handle are kept away from the tip of horizontal pole is fixed with respectively the locating part, the external diameter of locating part is greater than the internal diameter of second through-hole.

Further, a sealing gasket is arranged between the sealing plug and the cover body.

The invention has the beneficial effects that:

compared with the prior art, the combined sealing cover provided by the invention is used for sealing an ammunition packaging barrel, adopts a combined structure and comprises a cover body, a sealing ring and a pressing cover, wherein the cover body and the pressing cover are tightly matched for fixing the sealing ring, the structure is reliable, the bearing capacity is strong, the sealing ring is tightly matched with the ammunition packaging barrel, and the sealing effect is good; the cover body is provided with a hole and a sealing plug which is detachably connected, so that the problem that the ammunition packaging barrel is difficult to open due to negative pressure generated in the ammunition packaging barrel is avoided, and the ammunition packaging barrel is convenient to open; the draw-insert type carrying handle on the cover body enables the sealing cover to be convenient for compressing and opening, and is convenient for sealing and opening the ammunition packaging barrel.

Drawings

Figure 1 is an exploded view of a sectional sealing cover.

Fig. 2 is a schematic structural view of the assembled sealing cover.

Fig. 3 is a longitudinal sectional view of the assembled composite sealing cover.

Fig. 4 is a schematic structural view of the cover.

Fig. 5 is a schematic structural view of the seal ring.

Fig. 6 is a schematic structural view of the gland.

In the figure, the position of the upper end of the main shaft,

1. a cover body; 2. a seal ring; 3. a gland; 4. a carrying handle; 5. a limiting member; 11. a cover body; 12. a first connecting body; 13. a fixed mount; 21. an inner convex edge; 22. a tooth-shaped bulge; 23. an outer convex edge; 31. a second connector; 32. a gland body; 111. an aperture; 112. a sealing plug; 113. a gasket; 121. a protrusion; 131. a fixed frame; 132. a cross beam; 133. a first through hole; 134. a reinforcing plate; 321. and screwing the hole.

Detailed Description

The technical solution of the combined sealing cover according to the present invention will be explained and explained in detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is an exploded view of a composite sealing cover, and fig. 2 is a schematic view of a composite sealing cover after assembly. As shown in fig. 1 and 2, the present embodiment specifically discloses a combined sealing cover, which includes a cover body 1, a sealing ring 2 and a gland 3; the bottom of the sealing ring 2 is provided with an inward convex edge 21 extending inwards, the sealing ring 2 is sleeved on the cover body 1, the cover body 1 is fixedly connected with the gland 3, and the inward convex edge 21 is clamped between the lower end surface of the cover body 1 and the upper end surface of the outer edge of the bottom of the gland 3. Through 1 and the gland 3 of lid closely cooperate with 2 sealing washer compresses tightly and fixed, then closely cooperate with the ammunition packing section of thick bamboo, guarantee the stability of the sealed lid structure of whole combination formula, the cooperation is inseparable, and bearing capacity is strong, prevents between lid, gland and the sealing washer not hard up, avoids gas leakage, makes the ammunition packing section of thick bamboo after the sealing have good gas tightness.

Specifically, as shown in fig. 4, the lid body 1 includes an integrally formed lid body 11 and a first connecting body 12, and the lid body 11 is disposed above the first connecting body 12; as shown in fig. 6, the gland 3 includes a second connector 31 and a gland body 32 which are integrally formed, the second connector 31 is disposed above the gland body 32, and the outer side surface of the gland body 32 extends outwards to the outer edge of the bottom of the gland 3; fig. 3 is a longitudinal sectional view of the assembled combined sealing cover, as shown in fig. 3, the sealing ring 2 is sleeved on the first connecting body 12 of the cover body 1, the inner surface of the sealing ring 2 is attached to the outer surface of the second connecting body 12, the sealing ring 2 is tightly fitted with the second connecting body 12 to ensure the structural stability, the first connecting body 12 of the cover body 1 is sleeved on the second connecting body 31 of the gland 3, the inner convex edge 21 of the sealing ring 2 is clamped between the lower end surface of the first connecting body 12 and the upper end surface of the outer edge of the gland body 32, the inner convex edge 21 of the sealing ring 2 is tightly pressed by the first connecting body 12 and the gland body 32, and the sealing ring is fixed by the cover body 1 and the gland 3 to ensure the structural stability, tight fit and strong bearing capacity of the combined sealing cover, prevent looseness between the cover body, the gland and the sealing ring, avoid air leakage, and have good air tightness; the cover body 11 is provided with a vent hole 111, the vent hole 111 is detachably connected with a sealing plug 112, the gland body 32 is provided with a first central hole, the second connecting body 31 is provided with a second central hole communicated with the first central hole, the first central hole and the second central hole are used for communicating the interior of the packaging cylinder with the vent hole 111, when the combined sealing cover is pressed into the ammunition packaging cylinder, the sealing plug 112 is detached, preferably, the sealing plug 112 is clamped with the cover body 11 or in threaded connection, the vent hole 111 keeps a ventilation state, air extruded by the combined sealing cover in the ammunition packaging cylinder due to pressing in is discharged, then the sealing plug 112 is arranged in the vent hole 111, and the sealing environment in the whole ammunition packaging cylinder is kept; when the sealing is released, the sealing plug 112 is firstly disassembled to ensure that the internal pressure and the external pressure of the ammunition packaging barrel are the same, and then the combined sealing cover is pulled out of the opening of the ammunition packaging barrel to open the ammunition packaging barrel; the provision of the vent hole 111 and the sealing cap 112 avoids the problem of difficulty in opening the sealing cap due to the generation of negative pressure within the cartridge casing.

When the combined sealing cover is used, the sealing ring 2 is firstly sleeved on the first connecting body 12 of the cover body from bottom to top, then the gland 3 is installed from the bottom of the cover body 1, the second connecting body 31 of the gland is sleeved inside the first connecting body 12 of the cover body, the first connecting body 31 is fixedly connected with the first connecting body 12, the inner convex edge 21 of the sealing ring is pressed between the lower end face of the first connecting body 12 and the gland body 32 of the gland, the sealing ring 2 is pressed, the sliding of the sealing ring in any direction when the combined sealing cover is pressed into an ammunition packaging barrel is avoided, and a good sealing effect is ensured.

As shown in fig. 5, a plurality of tooth-shaped protrusions 22 are provided on the outer surface of the sealing ring 2, and the plurality of tooth-shaped protrusions 22 are in full contact with the inner wall of the ammunition packaging barrel, so that no gap is left between the sealing ring 2 and the inner wall of the ammunition packaging barrel, and a good sealing effect is achieved.

As shown in fig. 3, the lower surface edge of the cover body 11 is provided with a protrusion 121 extending downward, and the cover body 11 is covered above the first connecting body 12; the sealing ring 2 is provided with an outward protruding edge 23 extending outwards, the outward protruding edge 23 is arranged above the plurality of tooth-shaped protrusions 22, after the sealing ring 2 is sleeved on the first connecting body 12, the inward protruding edge 21 of the sealing ring is pressed between the lower end face of the first connecting body 12 and the upper end face of the gland body 32, the top of the sealing ring 2 is embedded between the inner side face of the protrusion 121 and the outer side face of the first connecting body 12, the upper end face of the outward protruding edge 23 is attached to the lower end face of the protrusion 121, the protrusion 121 provides a downward limiting force in the vertical direction, the cover body 1 and the gland 3 are matched with each other, the sealing ring 2 is fixed in an all-dimensional mode, the sealing ring 2 is prevented from slipping or shifting when the combined type sealing cover is installed into an ammunition packaging barrel, and the sealing ring 2 can be well sealed by the ammunition packaging barrel.

Preferably, first connector 12 and second connector 31 threaded connection, first connector 12 are equipped with the internal thread, and second connector 31 is equipped with the external screw thread with internal thread matched with, and threaded connection not only makes the sealed stable in structure of combination formula but also convenient to detach, has certain bearing capacity.

In some embodiments, the combined sealing cover further includes a handle 4, the handle 4 is slidably connected to the cover body 1, specifically, the handle 4 is U-shaped and includes a cross rod and two vertical rods, a fixing frame 13 is disposed above the cover body 11, the fixing frame 13, the cover body 11 and the first connecting body 12 are integrally formed, the fixing frame 13 includes a fixing frame 131 and a cross beam 132 which are integrally formed, the cross beam 132 is disposed inside the fixing frame 131, two first through holes 133 are disposed on the fixing frame 131, the cross beam 132 is disposed inside the fixing frame 131, two second through holes (not shown due to the angle relationship shown in the figure) are disposed on the cross beam 132, the cross rod of the handle 4 is disposed outside the fixing frame 131, the two vertical rods of the handle 4 respectively sequentially pass through the first through holes 133 and the second through holes, the handle 4 is slidably connected to the fixing frame 131 and the cross beam 132, the end portions of the two vertical rods of the handle 4 far away from the cross rod are respectively fixed with the limiting members 5, the outer diameter of the limiting member 5 is larger than the inner diameter of the second through hole, and the limiting member 5 is preferably a cotter pin. When the combined sealing cover is pressed into the ammunition packaging barrel, a hand holds the cross bar of the lifting handle 5, firstly, the lifting handle is pulled to the outside of the fixed frame 131 and then pressed downwards, and the cover body 1 is pressed into the ammunition packaging barrel by utilizing the lever principle to realize the compression of the combined sealing cover; when the combined sealing cover is lifted to open the ammunition packaging barrel, the cross rod of the lifting handle 5 is held by hand and pulled out, then the lifting handle 5 is lifted upwards, the combined sealing cover is pulled out of the ammunition packaging barrel, the combined sealing cover is opened, and the operation is simple and convenient.

The fixed frame 131 is internally provided with a plurality of reinforcing plates 134, the reinforcing plates 134 and the fixed frame 131 are integrally formed, one end of each reinforcing plate 134 is fixed on the cover body 11, and the other end of each reinforcing plate 134 is fixed on the inner side surface of the fixed frame 131, so that the pressure bearing capacity of the sealing cover is further improved.

The gland body 32 is provided with two screwing holes 321 for screwing the gland 3 and the cap body 1 through the screwing holes 321 with a tool.

A sealing gasket 113 is arranged between the sealing plug 112 and the cover body 11, so that the sealing performance of the combined sealing cover is further ensured.

After being combined, the combined sealing cover is arranged at the opening part of the cylindrical ammunition packaging barrel in a close fit mode, so that the sealing environment inside the ammunition packaging barrel is kept, gas is prevented from entering the ammunition packaging barrel, and the combined sealing cover has good air tightness.

The combination method of the combined sealing cover of the invention comprises the following steps: firstly, the sealing ring 2 is sleeved outside the first connecting body 12 of the cover body 1, the sealing ring 2 is tightly matched with the first connecting body 12, the upper surface of the inner convex edge 21 of the sealing ring 2 is contacted with the lower end surface of the first connecting body 12, the top of the sealing ring 2 is embedded into a groove formed by the protrusion 121 and the first connecting body 12, and the outer convex edge 23 of the sealing ring 2 is abutted against the protrusion 121 of the cover body 1; then the gland 3 is sleeved into the cover body 1, the second connector 31 of the gland 3 is spirally connected into the first connector 12, the inner convex edge 21 of the sealing ring 2 is pressed tightly, the combined installation of the combined sealing cover is completed, and the combined sealing cover is as shown in fig. 2. When the ammunition packaging barrel is sealed, the sealing plug 112 is opened, the lifting handle 4 is pulled out, the lifting handle 4 is pressed downwards, the combined sealing cover is pressed to the ammunition packaging barrel, the pressing cover 3 enters the inside of the ammunition packaging barrel, the sealing ring 2 is tightly matched with the inner wall of the ammunition packaging barrel, the bulge 121 of the cover body 11 is pressed above the ammunition packaging barrel, after the installation is finished, the sealing plug 112 is installed into the vent hole 111, and the lifting handle 4 is pushed back to realize the sealing of the ammunition packaging barrel; when the ammunition packaging barrel needs to be opened, the sealing plug 112 is opened, the air pressure inside and outside the ammunition packaging barrel is balanced, the lifting handle 4 is pulled out, the lifting handle 4 is pulled upwards, a lever is formed by the supporting point provided by the cross beam 132 and the fixing frame 13, the combined sealing cover is pulled out of the ammunition packaging barrel, the sealing is released, and the ammunition packaging barrel is opened.

The vent hole 111 serves as both a vent hole and a test hole, and the sealing plug 34 can be opened at any time and any place to test the airtightness and pressure-bearing capacity of the cartridge packaging tube.

The cover body 1, the sealing ring 2 and the gland 3 of the combined sealing cover are molded, the combined sealing cover can be used for an ammunition packaging barrel, the specific shape of the combined sealing cover is adaptively arranged according to the shape of the packaging barrel, and the packaging barrel can be cylindrical or cubic. If the packing cylinder is cylindrical, the cap body 11 is circular, the first connecting body 12, the second connecting body 31 and the protrusion 121 are annular, and the cap body 32 is annular and horizontal.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "the present embodiment," "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and simplifications made in the spirit of the present invention are intended to be included in the scope of the present invention.

Claims

1. A combined sealing cover is characterized in that: the combined sealing cover comprises a cover body (1), a sealing ring (2) and a gland (3), wherein an inward convex edge (21) extending inwards is arranged at the bottom of the sealing ring (2), the sealing ring (2) is sleeved on the cover body (1), the cover body (1) is fixedly connected with the gland (3), and the inward convex edge (21) is clamped between the lower end face of the cover body (1) and the upper end face of the outer edge at the bottom of the gland (3); the cover body (1) comprises a cover body (11) and a first connecting body (12) which are integrally formed, the cover body (11) is arranged above the first connecting body (12), the gland (3) comprises a second connecting body (31) and a gland body (32) which are integrally formed, the second connecting body (31) is arranged above the gland body (32), the outer side surface of the gland body (32) extends outwards to the outer edge of the bottom of the gland (3), the sealing ring (2) is sleeved on the first connecting body (12) of the cover body (1), the first connecting body (12) of the cover body (1) is sleeved on the second connecting body (31) of the gland (3), an inner convex edge (21) of the sealing ring (2) is clamped between the lower end surface of the first connecting body (12) and the upper end surface of the outer edge of the gland body (32); a plurality of tooth-shaped bulges (22) are arranged on the outer surface of the sealing ring (2); the edge of the lower surface of the cover body (11) is provided with a protrusion (121) extending downwards, the cover body (11) is covered above the first connecting body (12), the sealing ring (2) is provided with an outward protruding edge (23) extending outwards, the outward protruding edge (23) is arranged above the plurality of tooth-shaped protrusions (22), the top of the sealing ring (2) is embedded between the inner side surface of the protrusion (121) and the outer side surface of the first connecting body, and the upper end surface of the outward protruding edge (23) is attached to the lower end surface of the protrusion (121);

a vent hole (111) is formed in the cover body (11), a sealing plug (112) is detachably connected to the vent hole (111), a first central hole is formed in the gland body (32), and a second central hole communicated with the first central hole is formed in the second connecting body (31);

the first connecting body (12) is in threaded connection with the second connecting body (31), the first connecting body (12) is provided with an internal thread, and the second connecting body (31) is provided with an external thread matched with the internal thread;

the combined sealing cover further comprises a lifting handle (4), and the lifting handle (4) is connected with the cover body (1) in a sliding mode; the carrying handle (4) is U-shaped and comprises a cross rod and two vertical rods, a fixed frame (13) is arranged above the cover body (11), the fixing frame (13), the cover body (11) and the first connecting body (12) are integrally formed, the fixed frame (13) comprises a fixed frame (131) and a cross beam (132) which are integrally formed, the cross beam (132) is arranged inside the fixed frame (131), two first through holes (133) are arranged on the fixed frame (131), two second through holes are arranged on the cross beam (132), the cross bar of the lifting handle (4) is arranged outside the fixed frame (131), the two vertical rods of the carrying handle (4) respectively pass through the first through hole (133) and the second through hole in sequence, the end parts, far away from the transverse rod, of the two vertical rods of the carrying handle (4) are respectively fixed with a limiting piece (5), and the outer diameter of each limiting piece (5) is larger than the inner diameter of the second through hole.

2. The composite sealing cover of claim 1, wherein: a sealing gasket (113) is arranged between the sealing plug (112) and the cover body (11).