Automobile DAB safety airbag folding device

Abstract

The invention discloses an automobile DAB safety air bag folding device, and belongs to the field of automobile safety air bags, the automobile DAB safety air bag folding device comprises a rack, a limiting ring is fixed on the rack, a cover cap is placed in the limiting ring, a limiting strip is arranged on the circumference of the top of the cover cap, and a circular shell is arranged above the limiting ring; the rack is provided with an air cylinder used for driving the circular shell to ascend and descend, an air bag support is placed in the circular shell, limiting grooves with the same number as the limiting strips are formed in the air bag support, the limiting strips slide in the limiting grooves, and clamping mechanisms are installed on the limiting rings and the circular shell correspondingly; and the blocking mechanism is arranged on the circular shell. Through the arrangement of the blocking mechanism, the air bag can be effectively prevented from affecting installation of the cover cap and the air bag support, when the cover cap and the air bag support are installed, the situation that part of the structure of the air bag hinders the limiting strips from being inserted into the limiting grooves can be avoided, and the problem that in the prior art, assembly is difficult due to the influence of the air bag is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile safety airbags, in particular to an automobile DAB safety airbag folding device. Background Art

[0002] In the automobile safety system, the driver airbag (DAB) is an important safety protection component. Its performance and reliability are directly related to the life safety of the driver and passengers. The folding and assembly process of the DAB airbag plays a key role in the normal deployment of the airbag and the overall safety performance.

[0003] At present, there are some technical difficulties in the assembly process of automobile DAB airbags. Among them, the most prominent problem is that when assembling the cover and the airbag bracket, they will be affected by the folded airbag. Since the existing airbag folding method and structural design are not reasonable, there is a certain uncertainty in the size, shape and position of the folded airbag, which makes it difficult to assemble the cover and the airbag bracket. For example, some structures of the airbag may hinder the smooth installation of the cover, resulting in the need to repeatedly adjust the position of the airbag during the installation process, which seriously affects the assembly efficiency.

[0004] To this end, we propose a vehicle DAB airbag folding device. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the airbag folding method and structural design are not reasonable, and there is a certain uncertainty in the size, shape and position of the folded airbag, which often leads to assembly difficulties when assembling the cover and the airbag bracket. For example, some structures of the airbag may hinder the smooth installation of the cover, resulting in the need to repeatedly adjust the position of the airbag during the installation process, which seriously affects the assembly efficiency. A car DAB airbag folding device is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A DAB airbag folding device for automobiles comprises a frame, a limiting ring is fixed on the frame, a cover is placed inside the limiting ring, a limiting strip is arranged on the top circumference of the cover, a circular shell is arranged above the limiting ring, a cylinder for driving the circular shell to rise and fall is installed on the frame, an airbag bracket is placed inside the circular shell, limiting grooves having the same number as the limiting strips are opened inside the airbag bracket, the limiting strips slide in the limiting grooves, a clamping mechanism is installed on both the limiting ring and the circular shell, and further comprises: A blocking mechanism is arranged on the circular shell, and is used to block the airbag; The pushing mechanism is installed in the blocking mechanism, and when the limiting strip is inserted into the limiting groove, the pushing mechanism is used to squeeze the airbag.

[0007] Preferably, the blocking mechanism includes a liquid storage cylinder fixed on the frame, a piston disk 1 sliding inside the liquid storage cylinder, a lifting rod fixed to the top of the piston disk 1, the lifting rod is slidably connected to the liquid storage cylinder, a fixed disk is fixed to the top of the lifting rod, a spring 1 is sleeved on the outer surface of the lifting rod, the two ends of the spring 1 are respectively fixedly connected to the liquid storage cylinder and the fixed disk, and an extrusion rod corresponding to the position of the fixed disk is fixed to the outer surface of the circular shell.

[0008] Preferably, the blocking mechanism also includes a hose 1 connected to the liquid storage cylinder, the inner wall of the circular shell is provided with an inner cavity, one end of the hose 1 away from the liquid storage cylinder is connected to the inner cavity, the outer surface of the inner cavity is connected to a fixed cylinder, and a piston disk 2 slides inside the fixed cylinder.

[0009] Preferably, a slide rod is fixed on the second piston disc, the slide rod is slidably connected to the second piston disc, a second spring is sleeved on the outer surface of the slide rod, and two ends of the second spring are respectively fixedly connected to the fixed cylinder and the second piston disc.

[0010] Preferably, a connecting block is fixed to one end of the sliding rod away from the second piston disc, a blocking shell is fixed on the connecting block, the blocking shell is slidably connected to the circular shell, and the position of the blocking shell corresponds to the position of the limiting groove.

[0011] Preferably, the pushing mechanism includes a mounting block fixed to the bottom of the blocking shell, a rotating shaft is rotated on the mounting block through a bearing, a circular gear is fixed to one end of the rotating shaft, a rack is fixed to the outer surface of the circular shell, and the rack is meshed with the circular gear.

[0012] Preferably, the pushing mechanism also includes a turntable fixed on the end of the rotating shaft away from the circular gear, a push column is fixed on the side of the turntable away from the rotating shaft, a movable shell is slidably provided on the outer surface of the push column, a movable rod is fixed on the movable shell, and the movable rod is slidably connected to the blocking shell.

[0013] Preferably, the pushing mechanism also includes a rectangular bar fixed at the end of the moving rod away from the moving shell, the rectangular bar slides in the blocking shell, a connecting bar is fixed to the side of the rectangular bar away from the moving rod, an extrusion bar is fixed to the end of the connecting bar away from the rectangular bar, and a spring three is fixed between the rectangular bar and the inner wall of the blocking shell.

[0014] Preferably, an auxiliary mechanism is provided on the extrusion strip, the auxiliary mechanism comprises a second hose connected to the fixing tube, an air cushion is fixed to a side of the extrusion strip close to the airbag, and an end of the second hose away from the fixing tube is connected to the air cushion.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up the blocking mechanism, the airbag can be effectively prevented from affecting the installation of the cover and the airbag bracket. When the cover and the airbag bracket are installed, part of the structure of the airbag can be prevented from hindering the insertion of the limit strip into the limit groove, which solves the problem of assembly difficulty caused by the influence of the airbag in the prior art and improves the assembly efficiency of the cover and the airbag bracket.

[0016] 2. By setting up the pushing mechanism, the position and shape of the airbag can be further regulated, so that the airbag is in a more suitable state during the assembly process of the cover and the airbag bracket, reducing the impact of the airbag on the assembly, and at the same time helping to improve the deployment effect of the airbag in subsequent use and ensure its safety performance.

[0017] 3. The setting of the auxiliary mechanism can not only enhance the squeezing and protection effect of the airbag, but also, through the expansion of the air cushion, the squeezing distance of the airbag can be made longer, thereby further preventing the airbag from affecting the assembly of the cover and the airbag bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a DAB airbag folding device for a car proposed by the present invention; Figure 2 A schematic diagram of the internal structure of a liquid storage cylinder of a folding device for a DAB airbag of an automobile proposed by the present invention; Figure 3 A schematic diagram of the internal structure of a circular shell of a folding device for a DAB airbag of an automobile proposed by the present invention; Figure 4 A vehicle DAB airbag folding device proposed by the present invention Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5 A schematic diagram of the internal structure of a fixing cylinder of a folding device for a DAB airbag of an automobile proposed by the present invention; Figure 6 A vehicle DAB airbag folding device proposed by the present invention Figure 5 A magnified schematic diagram of the structure at B in the middle; Figure 7 A bottom view schematic diagram of a circular shell structure of a folding device for a DAB airbag of an automobile proposed by the present invention; Figure 8 A vehicle DAB airbag folding device proposed by the present invention Figure 7 Enlarged schematic diagram of the structure at point C in the middle.

[0019] In the figure: 1, frame; 11, limit ring; 12, cover; 13, limit strip; 14, circular shell; 15, airbag bracket; 16, limit groove; 21, liquid storage cylinder; 22, piston disk one; 23, lifting rod; 24, fixed disk; 25, spring one; 26, extrusion rod; 27, hose one; 28, inner cavity; 29, fixed cylinder; 210, piston disk two; 211, slide rod; 212, spring two; 213, connecting block; 214, blocking shell; 30, rack; 31, mounting block; 32, rotating shaft; 33, circular gear; 34, rotating disk; 35, push column; 36, moving shell; 37, moving rod; 38, rectangular strip; 39, connecting strip; 310, extrusion strip; 311, spring three; 41, hose two; 42, air cushion. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] Embodiment 1, refer to Figure 1-Figure 8 A DAB airbag folding device for automobiles comprises a frame 1, a limiting ring 11 is fixed on the frame 1, a cover 12 is placed in the limiting ring 11, a limiting strip 13 is arranged on the top circumference of the cover 12, a circular shell 14 is arranged above the limiting ring 11, a cylinder for driving the circular shell 14 to rise and fall is installed on the frame 1, an airbag bracket 15 is placed in the circular shell 14, and the airbag bracket 15 is provided with limiting grooves 16 having the same number as the limiting strips 13, the limiting strips 13 slide in the limiting grooves 16, and a clamping mechanism is installed on both the limiting ring 11 and the circular shell 14, and further comprises: A blocking mechanism is provided on the circular shell 14, and the blocking mechanism is used to block the airbag; The pushing mechanism installed in the blocking mechanism is used to squeeze the airbag when the limiting strip 13 is inserted into the limiting groove 16 .

[0022] Furthermore, the blocking mechanism includes a liquid storage cylinder 21 fixed on the frame 1, a piston disk 22 sliding inside the liquid storage cylinder 21, a lifting rod 23 fixed on the top of the piston disk 22, the lifting rod 23 is slidably connected to the liquid storage cylinder 21, a fixed disk 24 is fixed on the top of the lifting rod 23, a spring 25 is sleeved on the outer surface of the lifting rod 23, two ends of the spring 25 are respectively fixedly connected to the liquid storage cylinder 21 and the fixed disk 24, and an extrusion rod 26 corresponding to the position of the fixed disk 24 is fixed on the outer surface of the circular shell 14.

[0023] Furthermore, the blocking mechanism also includes a hose 27 connected to the liquid storage cylinder 21, and an inner cavity 28 is opened on the inner wall of the circular shell 14. The end of the hose 27 away from the liquid storage cylinder 21 is connected to the inner cavity 28. The outer surface of the inner cavity 28 is connected to a fixed cylinder 29, and a piston disk 210 slides inside the fixed cylinder 29.

[0024] Furthermore, a slide rod 211 is fixed on the piston disc 210, and the slide rod 211 is slidably connected to the piston disc 210. A spring 212 is sleeved on the outer surface of the slide rod 211, and both ends of the spring 212 are fixedly connected to the fixed cylinder 29 and the piston disc 210 respectively.

[0025] Furthermore, a connecting block 213 is fixed to one end of the slide rod 211 away from the second piston disc 210 , and a blocking shell 214 is fixed to the connecting block 213 . The blocking shell 214 is slidably connected to the circular shell 14 , and the position of the blocking shell 214 corresponds to the position of the limiting groove 16 .

[0026] When in use, the cover 12 is placed in the limiting ring 11, and the airbag bracket 15 is placed in the circular shell 14, so that the position of the limiting strip 13 is aligned with the position of the limiting groove 16, and the cover 12 and the airbag bracket 15 are clamped by a clamping device. The clamping device is composed of a cylinder and a clamping block. The clamping block is driven by the cylinder to move, so that the cover 12 and the airbag bracket 15 can be clamped and fixed to prevent movement during assembly. After the airbag is folded, it is first placed in the airbag bracket 15, and then the circular shell 14 and the airbag bracket 15 are driven downward by the cylinder until the limiting strip 13 is assembled into the limiting groove 16, thereby completing the folding and installation operation of the airbag. This is the existing technology, so it will not be described in detail here.

[0027] Considering that the airbag will be slightly fluffy after being folded, the airbag will block the edges of the airbag bracket 15 and the limiting groove 16, thereby affecting the assembly of the limiting strip 13 and the limiting groove 16, resulting in the need to repeatedly adjust the position of the airbag during installation, which seriously affects the assembly efficiency. The following improvements are now made: Initially, the blocking shell 214 is located at the bottom of the limiting groove 16, which can close the opening of the limiting groove 16, not only supporting the airbag, but also preventing the airbag from blocking the edge of the limiting groove 16. When the DAB airbag of the automobile is actually assembled, the liquid storage cylinder 21 on the frame 1 is fixed. When the cover 12 and the airbag bracket 15 need to be assembled, the cylinder drives the circular shell 14 to descend, and the extrusion rod 26 on the outer surface of the circular shell 14 will follow and descend, contact and squeeze the fixed plate 24, and the fixed plate 24 drives the lifting rod 23 to move downward, and the lifting rod 23 drives the piston plate 22 to move downward, pressing the spring 1 25 is squeezed, the piston disc 1 22 slides in the liquid storage cylinder 21, and the liquid in the liquid storage cylinder 21 is squeezed into the inner cavity 28 of the circular shell 14 through the hose 1 27. The liquid in the inner cavity 28 increases, the pressure increases, and it will enter the fixed cylinder 29, pushing the piston disc 210 to slide in the fixed cylinder 29, squeezing the spring 212, the piston disc 210 drives the slide bar 211 to move, and the slide bar 211 makes the blocking shell 214 slide out through the connecting block 213, so that the bottom outlet of the limiting groove 16 is opened, until the limiting strip 13 is inserted into the limiting groove 16, thereby ensuring the smooth assembly of the cover 12 and the airbag bracket 15.

[0028] A further advantage of adopting the above method is that by setting up the blocking mechanism, the airbag can be effectively prevented from affecting the installation of the cover 12 and the airbag bracket 15. When the cover 12 and the airbag bracket 15 are installed, part of the structure of the airbag can be prevented from hindering the insertion of the limit strip 13 into the limit groove 16, thereby solving the problem of assembly difficulty caused by the influence of the airbag in the prior art and improving the assembly efficiency of the cover 12 and the airbag bracket 15.

[0029] Example 2, refer to Figure 1-Figure 8 A DAB airbag folding device for automobiles comprises a frame 1, a limiting ring 11 is fixed on the frame 1, a cover 12 is placed in the limiting ring 11, a limiting strip 13 is arranged on the top circumference of the cover 12, a circular shell 14 is arranged above the limiting ring 11, a cylinder for driving the circular shell 14 to rise and fall is installed on the frame 1, an airbag bracket 15 is placed in the circular shell 14, and the airbag bracket 15 is provided with limiting grooves 16 having the same number as the limiting strips 13, the limiting strips 13 slide in the limiting grooves 16, and a clamping mechanism is installed on both the limiting ring 11 and the circular shell 14, and further comprises: A blocking mechanism is provided on the circular shell 14, and the blocking mechanism is used to block the airbag; The pushing mechanism installed in the blocking mechanism is used to squeeze the airbag when the limiting strip 13 is inserted into the limiting groove 16 .

[0030] Furthermore, the pushing mechanism includes a mounting block 31 fixed to the bottom of the blocking shell 214, a rotating shaft 32 is rotated on the mounting block 31 through a bearing, a circular gear 33 is fixed to one end of the rotating shaft 32, and a rack 30 is fixed to the outer surface of the circular shell 14, and the rack 30 is meshed with the circular gear 33.

[0031] Furthermore, the pushing mechanism also includes a turntable 34 fixed on the end of the rotating shaft 32 away from the circular gear 33, and a push column 35 is fixed on the side of the turntable 34 away from the rotating shaft 32. A movable shell 36 is slidably provided on the outer surface of the push column 35, and a movable rod 37 is fixed on the movable shell 36, and the movable rod 37 is slidably connected to the blocking shell 214.

[0032] Furthermore, the pushing mechanism also includes a rectangular bar 38 fixed to the end of the moving rod 37 away from the moving shell 36, the rectangular bar 38 slides in the blocking shell 214, a connecting bar 39 is fixed to the side of the rectangular bar 38 away from the moving rod 37, an extrusion bar 310 is fixed to the end of the connecting bar 39 away from the rectangular bar 38, and a spring three 311 is fixed between the rectangular bar 38 and the inner wall of the blocking shell 214.

[0033] Although the airbag can be prevented from blocking the edge of the limiting groove 16 by the blocking shell 214, when the blocking shell 214 is moved out, the tension of the airbag may still move to the limiting groove 16, thereby affecting the assembly of the cover 12 and the airbag bracket 15. The following improvements are now made: When the blocking shell 214 moves, the mounting block 31 moves synchronously with the blocking shell 214, and the circular gear 33 on the mounting block 31 meshes and rotates on the rack 30, driving the rotating shaft 32 to rotate, and the turntable 34 at the other end of the rotating shaft 32 rotates accordingly, and the push column 35 on the turntable 34 slides in the moving shell 36, pushing the moving rod 37 to slide in the blocking shell 214, and the moving rod 37 drives the rectangular bar 38, the connecting bar 39 and the extrusion bar 310 to move back and forth, squeezing the spring three 311, and in the process of the limit bar 13 being inserted into the limit groove 16, the extrusion bar 310 squeezes the airbag, effectively regularizing the position and shape of the airbag, making the airbag in a more suitable state for assembly, while improving the subsequent deployment effect and safety performance of the airbag.

[0034] A further benefit of adopting the above method is that when the blocking mechanism is in operation, the position and shape of the airbag can also be synchronously adjusted, so that the airbag is in a more suitable state during the assembly process of the cover 12 and the airbag bracket 15, reducing the impact of the airbag on the assembly, and at the same time helping to improve the deployment effect of the airbag in subsequent use to ensure its safety performance.

[0035] Example 3, refer to Figure 1-Figure 8A DAB airbag folding device for automobiles comprises a frame 1, a limiting ring 11 is fixed on the frame 1, a cover 12 is placed in the limiting ring 11, a limiting strip 13 is arranged on the top circumference of the cover 12, a circular shell 14 is arranged above the limiting ring 11, a cylinder for driving the circular shell 14 to rise and fall is installed on the frame 1, an airbag bracket 15 is placed in the circular shell 14, and the airbag bracket 15 is provided with limiting grooves 16 having the same number as the limiting strips 13, the limiting strips 13 slide in the limiting grooves 16, and a clamping mechanism is installed on both the limiting ring 11 and the circular shell 14, and further comprises: A blocking mechanism is provided on the circular shell 14, and the blocking mechanism is used to block the airbag; The pushing mechanism installed in the blocking mechanism is used to squeeze the airbag when the limiting strip 13 is inserted into the limiting groove 16 .

[0036] Furthermore, an auxiliary mechanism is provided on the extrusion strip 310 , and the auxiliary mechanism includes a hose 2 41 connected to the fixing tube 29 , an air cushion 42 is fixed to a side of the extrusion strip 310 close to the airbag, and an end of the hose 2 41 away from the fixing tube 29 is connected to the air cushion 42 .

[0037] Considering that the extrusion strip 310 will move outward together with the blocking shell 214, which will result in a shorter distance for the extrusion strip 310 to move out, thereby resulting in a shorter range for pushing the airbag, which will still affect the assembly effect, the following improvements are now made: When the piston disk 210 in the fixed cylinder 29 moves, the gas in the fixed cylinder 29 enters the air cushion 42 through the hose 241. The air cushion 42 is fixed to the side of the extrusion strip 310 close to the airbag. As the gas enters, the air cushion 42 expands. When the extrusion strip 310 squeezes the airbag, the air cushion 42 not only provides softer and more uniform pressure to avoid damage to the airbag, but also uses the expansion to squeeze the airbag farther, further preventing the airbag from affecting the assembly of the cover 12 and the airbag bracket 15, thereby significantly improving the folding and assembly quality of the airbag.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vehicle DAB airbag folding device, comprising a frame (1), characterized in that: A limit ring (11) is fixed on the frame (1), a cover (12) is placed inside the limit ring (11), a limit strip (13) is arranged on the top circumference of the cover (12), a circular shell (14) is arranged above the limit ring (11), a cylinder for driving the circular shell (14) to rise and fall is installed on the frame (1), an airbag bracket (15) is placed inside the circular shell (14), the airbag bracket (15) is provided with limit slots (16) the same number as the limit strips (13), the limit strips (13) slide in the limit slots (16), the limit ring (11) and the circular shell (14) are both installed with a clamping mechanism, and further comprising: A blocking mechanism is arranged on the circular shell (14), and is used to block the airbag; A pushing mechanism is installed in the blocking mechanism, and when the limiting strip (13) is inserted into the limiting groove (16), the pushing mechanism is used to squeeze the airbag.

2. The automobile DAB airbag folding device according to claim 1, characterized in that: The blocking mechanism comprises a liquid storage cylinder (21) fixed on a frame (1), a piston disk (22) slidingly arranged inside the liquid storage cylinder (21), a lifting rod (23) fixed on the top of the piston disk (22), the lifting rod (23) being slidably connected to the liquid storage cylinder (21), a fixed disk (24) fixed on the top of the lifting rod (23), a spring (25) sleeved on the outer surface of the lifting rod (23), two ends of the spring (25) being fixedly connected to the liquid storage cylinder (21) and the fixed disk (24) respectively, and an extrusion rod (26) corresponding to the position of the fixed disk (24) being fixed on the outer surface of the circular shell (14).

3. The automobile DAB airbag folding device according to claim 2, characterized in that: The blocking mechanism further comprises a hose (27) connected to the liquid storage cylinder (21); an inner cavity (28) is formed on the inner wall of the circular shell (14); an end of the hose (27) away from the liquid storage cylinder (21) is connected to the inner cavity (28); an outer surface of the inner cavity (28) is connected to a fixed cylinder (29); and a piston disc (210) slides inside the fixed cylinder (29).

4. The automobile DAB airbag folding device according to claim 3, characterized in that: A slide rod (211) is fixed on the second piston disc (210), and the slide rod (211) is slidably connected to the second piston disc (210). A second spring (212) is sleeved on the outer surface of the slide rod (211), and the two ends of the second spring (212) are respectively fixedly connected to the fixed cylinder (29) and the second piston disc (210).

5. The automobile DAB airbag folding device according to claim 4, characterized in that: A connecting block (213) is fixed to one end of the sliding rod (211) away from the second piston disc (210), and a blocking shell (214) is fixed to the connecting block (213). The blocking shell (214) is slidably connected to the circular shell (14), and the position of the blocking shell (214) corresponds to that of the limiting groove (16).

6. The automobile DAB airbag folding device according to claim 5, characterized in that: The pushing mechanism comprises a mounting block (31) fixed to the bottom of the blocking shell (214); a rotating shaft (32) is rotatably mounted on the mounting block (31) via a bearing; a circular gear (33) is fixed to one end of the rotating shaft (32); a rack (30) is fixed to the outer surface of the circular shell (14); and the rack (30) is meshed with the circular gear (33).

7. The automobile DAB airbag folding device according to claim 6, characterized in that: The pushing mechanism further comprises a rotating disk (34) fixed to an end of the rotating shaft (32) away from the circular gear (33); a push column (35) is fixed to a side of the rotating disk (34) away from the rotating shaft (32); a moving shell (36) is slidably mounted on the outer surface of the pushing column (35); a moving rod (37) is fixed to the moving shell (36); and the moving rod (37) is slidably connected to the blocking shell (214).

8. The automobile DAB airbag folding device according to claim 7, characterized in that: The pushing mechanism further comprises a rectangular bar (38) fixed to an end of the moving rod (37) away from the moving shell (36); the rectangular bar (38) slides in the blocking shell (214); a connecting bar (39) is fixed to a side of the rectangular bar (38) away from the moving rod (37); an extrusion bar (310) is fixed to an end of the connecting bar (39) away from the rectangular bar (38); and a spring three (311) is fixed between the rectangular bar (38) and the inner wall of the blocking shell (214).

9. The automobile DAB airbag folding device according to claim 8, characterized in that: An auxiliary mechanism is provided on the extrusion strip (310), the auxiliary mechanism comprising a second hose (41) connected to the fixing tube (29); an air cushion (42) is fixed to a side of the extrusion strip (310) close to the airbag, and an end of the second hose (41) away from the fixing tube (29) is connected to the air cushion (42).

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