CN220743361U - Broken type plane fragile cover - Google Patents

Abstract

The utility model relates to a broken-type plane fragile cover, which comprises an upper layer die and a lower layer die which are pressed into an integrated multilayer stacked plane structure; an upper cracking layer and a lower cracking layer are respectively arranged at the opposite sides close to the upper layer mould and the lower layer mould; a mesh layer is arranged between the upper cracking layer and the lower cracking layer so as to connect the upper cracking layer and the lower cracking layer; the three layers are coaxially arranged and provided with preset cracks which diverge from the center to the periphery; the upper rupture layer comprises a first throwing body, a first retaining flange surface and a transitional connecting surface for connecting the first throwing body and the first retaining flange surface; the transition connection surface is connected from the outer edge of the throwing body to the inner edge of the retaining flange surface in a segmented manner; the lower cracking layer comprises a second throwing body and a second retaining flange surface, and a transition connecting groove of the second throwing body and the second retaining flange surface; the transition connecting surface and the transition connecting groove are coaxially arranged. The whole fragile cover product can be torn in a whole while meeting the requirement of effective cracking, and can not splash everywhere. The use has little influence on environment.

Description

Broken type plane fragile cover

Technical Field

The utility model belongs to the field of high-speed impact test devices of aircraft launch boxes, and particularly relates to a burst type plane frangible cover.

Background

Aircraft launch vehicle covers are an important component in the launch system. The aircraft is stored in the transmitting box before being transmitted, the transmitting box bears certain air pressure, and the box cover can prevent internal air from leaking and can also play a role in protecting the aircraft in the transmitting box. The prior aircraft launching box cover is usually provided with various metal covers such as a mechanical opening or blasting cover, which not only increases the quality of the launching tube, but also delays the operation and is not beneficial to the use requirement. The fragile cover material is fiber reinforced silicone rubber, and compared with other fragile materials such as rigid polyurethane foam, the fragile cover material has better flexibility and does not generate fragments. However, in actual use, the cover body of the emission cover is difficult to ensure to effectively split under the action of large impact force when the cover is opened mechanically or exploded, the part, which needs to be reserved, of the edge of the cover body is not torn, and the broken part is complete.

By searching, application number CN202010898002.2 discloses a frangible cover comprising a base frame, a foam cover and a press frame; the edge of the foaming cover is tightly pressed by the bottom frame and the pressing frame and is fastened by adopting a connecting piece penetrating through the bottom frame and the pressing frame; the edge area of the foaming cover is smaller than that of the bottom frame, so that a peripheral gap is formed between the edge of the foaming cover and the bottom frame and is used for pouring airtight glue; the milling part of the foaming cover is also coated with airtight glue so as to prevent gas from leaking along the cover body of the foaming cover; the top surface diagonal department of foaming lid is equipped with cross stress groove along its radian, just the top surface edge mouth frame of foaming lid is equipped with annular stress groove all around, when the lid atress for the lid is four lamella breakage along stress groove. But this patent does not address the problem of broken partial integrity.

In summary, the utility model provides the broken type plane frangible cover which can effectively crack and not splash everywhere, not only can ensure the use effectiveness of the aircraft launching box cover, but also is environment-friendly, and meets the market demand.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a broken type plane frangible cover, wherein a net layer is arranged between an upper breaking layer and a lower breaking layer, so that the frangible cover product is formed into a whole. And meanwhile, the strength of a weak area (preset crack) of the fragile cover is adjusted, the influence of the crack strength on the maximum impact force is analyzed, and the crack strength of the fragile cover can be rapidly determined according to the maximum impact force so as to determine the direction and the structure of the preset crack. The upper cracking layer, the lower cracking layer and the reticular layer are provided with preset cracks which are diffused all around, and the scientific arrangement of the transitional connecting surface and the transitional connecting groove is combined, so that the whole fragile cover product can be torn in a whole while the effective cracking is satisfied, and the whole fragile cover product cannot be splashed all around.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

providing a broken type plane fragile cover, comprising an upper layer die and a lower layer die which are pressed into an integrated multilayer stacked plane structure; an upper cracking layer and a lower cracking layer are respectively arranged at the opposite sides close to the upper layer mould and the lower layer mould; a mesh layer is arranged between the upper cracking layer and the lower cracking layer so as to connect the upper cracking layer and the lower cracking layer;

the upper cracking layer, the lower cracking layer and the reticular layer are coaxially arranged and provided with preset cracks which diverge from the center to the periphery, and the preset cracks are respectively an upper preset crack, a middle preset crack and a lower preset crack;

the upper cracking layer comprises a first throwing body, a first retaining flange surface and a transitional connecting surface for connecting the first throwing body and the first retaining flange surface; the transition connection surface is connected from the outer edge of the throwing body to the inner edge of the retaining flange surface in a segmented manner;

the lower cracking layer comprises a second throwing body and a second retaining flange surface, and a transition connecting groove of the second throwing body and the second retaining flange surface; the transition connecting surface and the transition connecting groove are coaxially arranged.

The broken plane frangible cover adopts the mesh layer arranged between the upper and lower existing fracture layers as a connecting structure, and can fix three layers by adopting bonding so as to increase the bonding strength of the frangible cover product; when the broken cover is broken, the upper layer and the lower layer which are broken can still be adhered to the net layer by the structure of the net layer, and the broken cover is broken only in the weak area of the broken cover.

The upper cracking layer, the lower cracking layer and the netlike layer are coaxially arranged and provided with preset cracks which diverge from the center to the periphery. The design is to break according to the direction of the pre-crack when the breaking force is applied; and the edge of the upper and lower rupture layers is also provided with a transition joint (a transition joint surface and a transition joint groove), so that the whole cover body can be ruptured along the transition joint, and the redundant part can not be tethered on the indwelling flange surface.

Further, the upper cracking layer, the lower cracking layer and the reticular layer are of a round or square structure as a whole, and the preset cracks divide the first throwing body, the second throwing body and the reticular layer into a plurality of uniformly distributed third throwing bodies.

Further, the transition connection surface is a connection sheet arranged on the third throwing body at intervals, and empty slots with the same shape as the outer edge of the third throwing body are arranged between the adjacent connection sheets. The design of the empty slot is adjusted according to the impact force and the strength of the whole cover body product. The length of connection piece in this embodiment is less than the length of empty slot, can guarantee the effective fracture of transitional coupling department.

Further, the transition connecting groove is a through groove structure cut from the upper surface of the lower fracture layer to the lower surface, a connecting block protruding from the throwing body to the retaining flange surface II is arranged between the through groove structures, and the connecting block is abutted to the retaining flange surface II.

Further, the connecting pieces and the throwing body are arranged one by one correspondingly. The connecting sheet is used for dividing the empty slot into two sections with the same area on average.

Further, the mesh layer covers the entire bonding surface of the upper and lower rupture layers, and is adhered or embedded between the upper and lower rupture layers; the reticular layer is reticular nylon material or spiral nylon material. The nylon net takes nylon yarn, polyester yarn, nano-fiber yarn and other chemical fibers as raw materials, and has the characteristics of high toughness, good elasticity, corrosion resistance, oil resistance, water resistance, wear resistance, high temperature resistance, weather resistance and the like; also has the characteristics of good insulativity, low lubrication coefficient and the like. The mesh structure is operative to connect the upper and lower rupture layers, and to join the mesh layer to the upper and lower rupture layers. When in use, even if the upper and lower fracture layers are broken by impact, the mesh layer can still effectively connect fragments by utilizing the mesh structure.

Further, the area of the middle preset crack of the mesh layer is larger than the areas of the upper preset crack and the lower preset crack of the upper cracking layer and the lower cracking layer. The lower preset crack of the lower cracking layer is smaller, and a plurality of thickening designs are arranged at the edges of the lower preset crack, so that the lower cracking layer is ensured to have certain use strength. The middle pre-made cracks are arranged to be wider, so that the bonding position of the reticular layer can be effectively found, the directions of the upper pre-set cracks and the lower pre-set cracks are consistent during manufacturing, and the requirement of effective cracking is met during bursting.

Further, the length of the middle preset crack of the reticular layer is larger than the length of the upper preset crack of the upper rupture layer and smaller than the inner diameter of the first retaining flange surface of the upper rupture layer.

Further, the length of the middle preset crack of the mesh layer is equal to the length of the lower preset crack in the lower fracture layer.

Further, a mounting hole is provided near the outer edge of the multi-layer stacked planar structure of the connecting piece.

Compared with the prior art, the utility model has the beneficial effects that:

1. the broken type plane fragile cover has good overall light weight, water resistance, dust resistance, corrosion resistance and other performances; and has certain strength, and can protect the inside aircraft from being effectively isolated from the outside when not in use.

2. The broken plane frangible cover of the utility model adopts the mesh layer arranged between the upper and lower layers of the prior art as a connecting structure, can adopt bonding to fix three layers, can increase the bonding strength of the frangible cover product, and can lead the broken upper and lower layers to still be bonded on the mesh layer by the structure of the mesh layer when broken, and the broken upper and lower layers can only generate breakage in the weak area of the frangible cover.

3. The upper cracking layer, the lower cracking layer and the reticular layer of the broken-type plane frangible cover are provided with preset cracks which are diffused all around, and the whole frangible cover product can be torn in a whole while meeting the requirement of effective cracking by combining the scientific arrangement of the transitional connecting surface and the transitional connecting groove, so that the broken-type plane frangible cover can not be splashed all around. The use has little influence on environment.

Drawings

Fig. 1 is a schematic overall structure of a broken-type planar frangible cover according to the present utility model.

Fig. 2 is a schematic view of the assembly of the frangible cover according to the present utility model.

FIG. 3 is a schematic view of the structure of the upper rupture layer of the frangible cover according to the present utility model.

FIG. 4 is a schematic top view of the lower rupture layer of the side of the frangible cover adjacent to the upper rupture layer of the present utility model.

Fig. 5 is an enlarged view of the structure at E of fig. 4.

FIG. 6 is a schematic view of the lower surface of the lower rupture layer of the frangible cover of the present utility model.

FIG. 7 is a schematic view of the structure of the mesh layer of the frangible cover according to the present utility model.

The reference numerals include: 1. the upper fracture layer, 11, the first casting body, 12, the first retaining flange surface, 13, the transitional connecting surface, 14, the reinforcing rib, 2, the lower fracture layer, 21, the second casting body, 22, the second retaining flange surface, 23, the transitional connecting groove, 24, the connecting block, 25, the reinforcing rib, 3, the netlike layer, 31, the third casting body, 4, the preset crack, 4A, the upper preset crack, 4B, the middle preset crack, 4C, the lower preset crack, 5, the mounting hole, the A-upper layer die and the B-lower layer die.

Detailed Description

For the purposes of illustrating and understanding the utility model, the following words are first described in the meaning of the utility model: embodiments of the present utility model are described in detail below with reference to FIGS. 1-7.

Example 1

The broken type plane frangible cover disclosed by the embodiment is designed by the cover body, and the reticular layer is designed between the upper breaking layer and the lower breaking layer, so that the whole frangible cover product can be torn in a whole while meeting the requirement of effective cracking, and can not splash everywhere.

Specifically, the method comprises the steps that an upper layer mold (A) and a lower layer mold (B) are used for pressing the rupture layer 1, the netlike layer 3 and the lower rupture layer 2 into an integrated multilayer stacked plane structure; namely, an upper fracture layer 1 and a lower fracture layer 2 are respectively arranged on the opposite sides close to the upper and lower molds (A, B); the mesh layer 3 connects the upper and lower rupture layers; the overall shape of the upper cracking layer 1 and the lower cracking layer 2 is the same as that of the netlike layer 3, the netlike layer 3 covers the whole joint surface of the upper cracking layer 1 and the lower cracking layer 2, and the netlike layer 3 is adhered or embedded between the upper cracking layer 1 and the lower cracking layer 2; the present embodiment is preferably of circular configuration. The upper cracking layer 1, the lower cracking layer 2 and the netlike layer 3 are coaxially arranged, and preset cracks 4 which diverge from the center to the periphery are respectively an upper preset crack 4A, a middle preset crack 4B and a lower preset crack 4C. The design is to break according to the direction of the pre-crack when the breaking force is applied; and the edge of the upper and lower rupture layers is provided with a transition joint (a transition joint surface 13 and a transition joint groove 23), so that the whole cover body can be ruptured along the transition joint, and the redundant part can not be tethered on the indwelling flange surface. The two sides of the lower preset crack 4C are provided with reinforcing ribs 25 protruding out of the surface of the lower cracking layer 2.

The upper and lower fracture layers are made of fiber reinforced silicone rubber, and the reticular layer 3 is made of reticular nylon material or spiral nylon material. The nylon net takes nylon yarn, polyester yarn, nano-fiber yarn and other chemical fibers as raw materials, and has the characteristics of high toughness, good elasticity, corrosion resistance, oil resistance, water resistance, wear resistance, high temperature resistance, weather resistance and the like; also has the characteristics of good insulativity, low lubrication coefficient and the like. The mesh structure may operatively connect the upper and lower rupture layers, joining the mesh layer with the upper and lower rupture layers 1, 1. When in use, even if the upper and lower fracture layers are broken by impact, the mesh layer can still effectively connect fragments by utilizing the mesh structure.

The upper rupture layer 1 of the present embodiment includes a first throw-out body 11 and a first indwelling flange face 12, and a transitional connection face 13 connecting the first throw-out body 11 and the first indwelling flange face 12; the transition connection surface 13 is connected from the outer edge of the throwing body I11 to the inner edge of the retaining flange surface I12 in a segmented manner; the transition connection surface 13 is a connection piece 131 which is arranged on the throwing body at intervals, and empty grooves 132 which are consistent with the outer edge shape of the first throwing body 11 are arranged between the adjacent connection pieces 131. The connecting pieces 131 are arranged one by one corresponding to the first thrower 11. The connecting piece 131 equally divides the empty slot 132 into two sections of the same area. Mounting holes 5 are provided near the outer edges of the stacked planar structures of tabs 131 to facilitate the locking connection of the frangible covers of the stacked planar structures.

Correspondingly, the lower rupture layer 2 comprises a second throwing body 21, a second retaining flange surface 22 and a transition connecting groove 23 for the second throwing body 21 and the second retaining flange surface 22; the transition surface 13 and the transition groove 23 are coaxially arranged. The transition connecting groove 23 is a through groove structure cut from the upper surface to the lower surface of the lower fracture layer 2, a connecting block 24 protruding from the second throwing body 21 to the second retaining flange surface 22 is arranged between the through groove structures, and the connecting block 24 is abutted against the inner wall of the second retaining flange surface 22.

The entirety of the upper rupture layer 1, the lower rupture layer 2 and the mesh layer 3 may have a circular or square structure; the preset crack 4 divides the first ejection body 11, the second ejection body 21 and the netlike layer 3 into a plurality of ejection bodies III 31 which are uniformly distributed. The broken plane frangible cover takes the mesh layer arranged between the upper and lower existing fracture layers as a connecting structure, and can fix three layers by adopting bonding so as to increase the bonding strength of the frangible cover product; when the broken cover is broken, the upper layer and the lower layer which are broken can still be adhered to the net layer by the structure of the net layer, and the broken cover is broken only in the weak area of the broken cover.

In this embodiment, the area of the middle preset crack 4B of the mesh layer 3 is larger than the areas of the upper and lower preset cracks of the upper and lower fracture layers 1 and 2. The lower preset crack of the lower cracking layer is smaller, and a plurality of thickening designs are arranged at the edges of the lower preset crack, so that the lower cracking layer is ensured to have certain use strength. The middle pre-made cracks are arranged to be wider, so that the bonding position of the reticular layer can be effectively found, the directions of the upper pre-set cracks and the lower pre-set cracks are consistent during manufacturing, and the requirement of effective cracking is met during bursting.

And the length of the middle preset crack 4B of the netlike layer 3 is larger than the length of the upper preset crack 4A of the upper rupture layer 1 and smaller than the inner diameter of the retaining flange face one 12 of the upper rupture layer 1. The length of the intermediate pre-crack 4B of the mesh layer 3 is equal to the length of the lower pre-crack 4C in the lower fracture layer 2. That is, the middle preset crack 4B extends into the empty groove 132, so that the whole fragile cover product can be effectively cracked and can be torn in a whole without splashing.

The upper cracking layer, the lower cracking layer and the reticular layer of the broken-type plane frangible cover are provided with preset cracks which are diffused all around, and the whole frangible cover product meets the requirement of whole tearing by combining with the scientific arrangement of the transition connecting surface and the transition connecting groove, so that the broken-type plane frangible cover has little influence on the environment during use.

The above is merely an embodiment of the present utility model, and the present utility model is not limited to the field of the present embodiment, but the specific structure and characteristics of the present utility model are not described in detail. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the present utility model, which should also be considered as the scope of the present utility model, and which does not affect the effect of the present utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (10)

1. The broken type plane fragile cover is characterized by comprising an integrated multilayer stacked plane structure formed by pressing an upper layer of die and a lower layer of die; an upper cracking layer (1) and a lower cracking layer (2) are respectively arranged at the opposite sides close to the upper layer mould and the lower layer mould; a netlike layer (3) is arranged between the upper rupture layer (1) and the lower rupture layer (2) so as to connect the upper and lower rupture layers;

the upper cracking layer (1), the lower cracking layer (2) and the netlike layer (3) are coaxially arranged and provided with preset cracks (4) which diverge from the center to the periphery, namely an upper preset crack (4A), a middle preset crack (4B) and a lower preset crack (4C);

the upper cracking layer (1) comprises a first throwing body (11), a first retaining flange surface (12) and a transitional connecting surface (13) for connecting the first throwing body (11) and the first retaining flange surface (12); the transition connecting surface (13) is connected from the outer edge of the first throwing body (11) to the inner edge of the first retaining flange surface (12) in a segmented manner;

the lower rupture layer (2) comprises a second throwing body (21) and a second retaining flange surface (22), and a transition connecting groove (23) for the second throwing body (21) and the second retaining flange surface (22); the transition connecting surface (13) and the transition connecting groove (23) are coaxially arranged.

2. The frangible cover according to claim 1, wherein the entirety of the upper (1), lower (2) and mesh layers (3) is of circular or square configuration; the preset cracks (4) divide the first throwing body (11), the second throwing body (21) and the netlike layer (3) into a plurality of throwing bodies III (31) which are uniformly distributed.

3. The broken flat fragile cover according to claim 2, wherein the transition connection surface (13) is a connection piece (131) arranged on the ejector body at intervals, and a hollow groove (132) consistent with the shape of the outer edge of the ejector body I (11) is arranged between the adjacent connection pieces (131).

4. A broken flat fragile cover according to claim 3, wherein the transition connecting groove (23) is a through groove structure cut from the upper surface to the lower surface of the lower breaking layer (2), a connecting block (24) protruding from the second throw-out body (21) to the second retaining flange surface (22) is arranged between the through groove structures, and the connecting block (24) is abutted against the inner wall of the second retaining flange surface (22).

5. The frangible cover according to claim 3 or 4, wherein the connecting tabs (131) are arranged one by one in correspondence with the ejection body one (11).

6. The frangible cover according to claim 5, wherein the mesh layer (3) covers the entire junction of the upper and lower rupture layers (1, 2), the mesh layer (3) being bonded or embedded between the upper and lower rupture layers (1, 2); the reticular layer (3) is made of reticular nylon material or spiral nylon material.

7. The frangible cover according to claim 6, wherein the area of the intermediate pre-cracks (4B) of the mesh layer (3) is greater than the areas of the upper and lower pre-cracks of the upper and lower rupture layers (1, 2).

8. The frangible cover according to claim 7, wherein the length of the intermediate pre-crack (4B) of the mesh layer (3) is greater than the length of the upper pre-crack (4A) of the upper fracture layer (1) and less than the inner diameter of the stay-on flange face one (12) of the upper fracture layer (1).

9. The frangible cover according to claim 8, wherein the length of the intermediate pre-crack (4B) of the mesh layer (3) is equal to the length of the lower pre-crack (4C) in the lower fracture layer (2).

10. A frangible cover according to claim 9, characterised in that mounting holes (5) are provided near the outer edges of the multilayer stacked planar structure of the tabs (131).