Rapidly-folded air bag for tunnel plugging

Abstract

The rapidly-folded air bag for tunnel plugging comprises a mounting base, the mounting base is of a cylindrical structure with the central axis extending in the front-back direction, and the mounting base is arranged in the middle of the air bag in the axial direction; the circumferential supporting structure is arranged in the circumferential direction of the mounting base, and the end, away from the mounting base, of the circumferential supporting structure is fixedly connected with the air bag; the stretching mechanisms are symmetrically arranged on the left and right sides of the mounting base; the stretching mechanism comprises an axial stretching structure and a radial stretching structure; the axial stretching structure comprises a first driving structure and a supporting assembly, and one end of the supporting assembly is fixedly connected with a fixing disc at the end of the air bag. The radial stretching structure comprises a supporting disc, the supporting disc comprises a sliding block, one end of the sliding block is used for ejecting the air bag to the tunnel wall, the radial stretching structure comprises a second driving structure, and the second driving structure drives the sliding block to move in the radial direction of the supporting disc; when the air bag needs to be inflated to block the tunnel, the air bag can stretch in two directions in the axial direction and the radial direction, and the air bag can be rapidly unfolded and folded.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel safety, and in particular relates to a fast-folding airbag for tunnel blocking. Background Art

[0002] With the continuous development of railway transportation, underground space has been gradually developed and utilized, and safety issues in railway construction and operation have become increasingly prominent. Once some potential threats such as groundwater leakage, sudden floods, toxic gases, etc. occur, they will not only affect the normal construction and operation of the tunnel, but also cause loss of life and property. If the disaster cannot be effectively isolated after it occurs, the spread of the disaster will undoubtedly cause greater economic losses and casualties.

[0003] In recent years, the use of blocking airbags in tunnel separation to effectively prevent the spread of disasters has emerged with the urbanization process. However, when the sudden and extremely large water surge exceeds the maximum external force that the airbag can withstand, or the airbag fails to continue to work normally for some reason, the water surge will push the airbag forward at high speed, causing impact damage to the machinery and personnel in the tunnel. Therefore, when the above situation occurs, the airbag needs to be stored in time and automatically to avoid the airbag becoming a secondary source of danger. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a fast-collapsed tunnel plugging airbag to solve the technical problem in the prior art that the airbag cannot continue to block the water inrush in an emergency and thus prevent the airbag from becoming a secondary danger source.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the fast-collapsed tunnel plugging airbag of the present invention is: A fast-collapsed tunnel plugging airbag, comprising: A mounting seat is arranged in the airbag, the mounting seat is a cylindrical structure whose central axis extends in the front-rear direction, and the mounting seat is axially arranged in the middle of the airbag; A circumferential support structure is arranged on the circumference of the mounting seat, and one end of the circumferential support structure away from the mounting seat is fixedly connected to the airbag; The extension mechanism is symmetrically arranged on the left and right sides of the mounting seat; The stretching mechanism includes an axial stretching structure and a radial stretching structure; The axial extension structure includes a first driving structure fixedly connected to the mounting seat, and a support assembly fixedly connected to the first driving structure. One end of the support assembly away from the mounting seat is fixedly connected to a fixed plate at the end of the airbag. The first driving structure drives the support assembly to move forward and backward in the axial direction of the airbag to realize the expansion or contraction of the airbag in the axial direction. The radial extension structure includes a support plate, which is arranged at the connection between the cylindrical section of the airbag and the hemispherical structure. The central axis of the support plate coincides with the central axis of the airbag. The support plate includes a sliding block that can move in the radial direction. The end of the sliding block away from the central axis of the support plate is fixedly connected to the airbag. The radial extension structure also includes a second driving structure for driving the sliding block to move radially in the support plate. The second driving structure drives the sliding block to move radially along the support plate to realize the radial expansion or contraction of the airbag.

[0006] Beneficial effect: In the present invention, by setting a circumferential support structure on the mounting seat, the mounting seat can be stably supported in the tunnel. By setting the axial telescopic structure in the extension mechanism, the first driving structure drives the support assembly to move forward and backward in the axial direction of the airbag to realize the axial expansion or contraction of the airbag; by setting the radial extension structure, the second driving structure drives the sliding block to move along the radial direction of the support plate to realize the radial expansion or contraction of the airbag. Thus, the airbag can be quickly expanded and stored in both the axial and radial directions. When the airbag needs to be inflated to block the tunnel, it can be stretched bidirectionally in the axial and radial directions, and the airbag can be quickly deployed; when the airbag is stored after use, it can also be contracted bidirectionally in the axial and radial directions, and the storage is fast and complete.

[0007] Furthermore, the support assembly includes a first mounting plate, which is fixedly connected to an end of the first driving structure away from the mounting seat, and a guide rod is fixedly connected between the first mounting plate and the fixed plate. A plurality of guide rods are evenly distributed around the circumference of the first mounting plate, and an avoidance hole for the guide rod to pass through is opened in the middle of the support plate.

[0008] Beneficial effect: By arranging a guide rod between the first mounting plate and the fixed plate in the support assembly, the stability of the support assembly structure can be ensured, so that during the forward and backward extension and retraction process of the first driving structure, the support assembly can drive the fixed plate at the end of the airbag to extend and retract forward and backward, thereby facilitating the axial extension and retraction adjustment of the airbag.

[0009] Furthermore, a connecting rod is fixed to the end of the second driving structure away from the mounting seat, and a through hole for the connecting rod to pass through is opened in the center of the first mounting plate; a top pressure plate is fixed to the end of the connecting rod away from the second driving structure, and a through hole for the guide rod to pass through is opened in the circumferential direction of the top pressure plate corresponding to the guide rod, and a spring is sleeved on the guide rod between the fixed plate and the top pressure plate, a first connecting rod is hingedly connected between the fixed plate and the sliding block, and a second connecting rod is hingedly connected between the top pressure plate and the sliding block.

[0010] Beneficial effect: Through the extension and retraction of the second driving structure in the front-to-rear direction, the spring on the connecting rod and the pressure plate can be driven to press the guide rod. At the same time, as the distance between the pressure plate and the support plate and the distance between the fixed plate and the support plate change, the sliding block on the support plate can be moved along the radial extension and retraction of the support plate, thereby realizing the contraction or expansion of the airbag in the radial direction.

[0011] Furthermore, a front guide groove and a rear guide groove are respectively provided on the front and rear sides of the support plate, and the sliding block includes a front guide portion adapted for sliding with the front guide groove, a rear guide portion adapted for sliding with the rear guide groove, and a connecting portion fixedly connected with the front guide portion and the rear guide portion; the front guide portion, the rear guide portion, and the connecting portion form an inverted U-shaped structure, and the connecting portion is fixedly connected to the airbag.

[0012] Beneficial effect: In the present invention, when the pressure plate presses the spring, the first connecting rod and the second connecting rod can simultaneously apply force to the sliding block, so that the sliding block moves radially outward or inward relative to the support plate, thereby ensuring the stability of the movement of the sliding block relative to the support plate and completing the deployment or contraction of the airbag in the radial direction.

[0013] Furthermore, the cross-sectional shapes of the front guide groove and the rear guide groove are both dovetail grooves, the front guide portion includes a guide block that is slidably adapted to the guide of the dovetail-shaped front guide groove and a protrusion that is integrally formed with the guide block, and the rear guide portion includes a guide block that is slidably adapted to the guide of the dovetail-shaped rear guide groove and a protrusion that is integrally formed with the guide block.

[0014] Beneficial effects: ensuring the stability of the front guide part and the front guide groove during the guiding sliding process, and at the same time ensuring the stability of the rear guide part and the rear guide groove during the guiding sliding process.

[0015] The circumferential support structure comprises a plurality of telescopic rods evenly arranged in the circumferential direction of the mounting seat, arc-shaped plates are fixed to the ends of the telescopic rods, and the airbags are fixedly connected to the arc-shaped plates.

[0016] Beneficial effect: The provision of the circumferential support structure can ensure that the airbag can be conveniently deployed or retracted at the mounting seat.

[0017] The cylindrical section of the airbag comprises an inner layer and an outer layer arranged at intervals outside the inner layer, and a gas sandwich layer for filling high-pressure gas is formed between the inner layer and the outer layer.

[0018] Beneficial effects: On the one hand, it can ensure that the cylindrical section of the airbag has a high structural strength. On the other hand, a high-pressure gas interlayer can be formed in the cylindrical section of the airbag, ensuring that the cylindrical section of the airbag can fit closely with the tunnel wall, thereby increasing the friction between the airbag and the tunnel wall.

[0019] Furthermore, a plurality of annular channels with a regular hexagonal cross-section are formed between the inner layer and the outer layer, and the annular channels are connected in the axial direction of the airbag; the edges and corners of the regular hexagonal annular channels face the outer layer, so as to form a plurality of annular extrusion belts in the axial direction of the airbag after the gas interlayer is filled with high-pressure gas.

[0020] Beneficial effect: The multiple annular extrusion belts formed can enable the airbag to generate a strong extrusion force with the tunnel wall at the annular extrusion belts, thereby increasing the friction between the airbag and the tunnel wall and ensuring the stability of the airbag in the tunnel.

[0021] The hemispherical structure of the airbag is connected to the cylindrical section, and includes an inner wall layer and an outer wall layer spaced outside the inner wall layer. A gas interlayer filled with high-pressure gas is formed between the inner wall layer and the outer wall layer, and the thickness of the outer wall layer is greater than that of the inner wall layer.

[0022] Beneficial effects: a double-layer structure is set at the hemispherical structure of the airbag, which facilitates the communication between the gas interlayer of the hemispherical structure and the gas interlayer of the cylindrical section; in addition, the outer wall layer is set to a thicker structure, which can increase the anti-extrusion ability of the hemispherical structure of the airbag.

[0023] The fixing plate is provided with a first air inlet for gas to enter, and the hemispherical structure of the airbag is provided with a second air inlet for inflating the air interlayer of the airbag.

[0024] Beneficial effect: The first air inlet and the second air inlet are respectively provided, so that it is convenient to realize simultaneous inflation and deflation of the airbag interior and the gas interlayer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a fast-folding tunnel plugging airbag of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the middle support plate; Figure 3 yes Figure 2 AA section view in the middle support plate; Figure 4 It is a schematic diagram of the structure of the sliding block in the support plate; Figure 5 It is a schematic diagram of the structure of the cylindrical section of the airbag.

[0026] Figure markings: 1-mounting seat; 2-telescopic rod; 3-first hydraulic cylinder; 4-second hydraulic cylinder; 5-first mounting plate; 6-guide rod; 7-connecting rod; 8-pressure plate; 9-spring; 10-support plate; 11-sliding block; 12-first connecting rod; 13-second connecting rod; 14-fixed plate; 15-outer wall layer; 16-inner wall layer; 17-regular hexagonal annular channel; 18-front guide groove; 19-avoidance hole; 20-bump; 21-front guide part; 22-rear guide part; 23-connecting part; 24-outer layer; 25-inner layer; 26-guide block. DETAILED DESCRIPTION

[0027] The following is a further detailed description of a fast-folding tunnel plugging airbag of the present invention in conjunction with the accompanying drawings and specific embodiments: like Figure 1 As shown, a fast-folding tunnel plugging airbag of the present invention includes a mounting seat 1 arranged in the airbag, the mounting seat 1 is a cylindrical structure with a central axis extending in the front-to-back direction, and the mounting seat 1 is axially arranged in the middle of the airbag.

[0028] A circumferential support structure is provided on the circumference of the mounting seat 1, and one end of the circumferential support structure away from the mounting seat 1 is fixedly connected to the airbag to facilitate the radial expansion or contraction of the airbag at the mounting seat 1. Specifically, the circumferential support structure includes a plurality of telescopic rods 2 evenly distributed on the circumference of the mounting seat 1, and an arc plate is fixed on the end of the telescopic rod 2, and the airbag is fixedly connected to the arc plate. When the telescopic rod 2 is extended and pressed against the tunnel wall, the mounting seat 1 is fixed relative to the tunnel.

[0029] Extension mechanisms are symmetrically arranged on the left and right sides of the mounting seat 1, and the extension mechanisms include an axial extension structure and a radial extension structure. Specifically, the axial extension structure includes a first driving structure fixedly connected to the mounting seat 1 and a support assembly fixedly connected to the first driving structure. In this embodiment, the first driving structure is a first hydraulic cylinder 3 extending along the front-to-back direction. In this embodiment, the structure of the first hydraulic cylinder 3 is prior art and will not be described in detail here. The end of the support assembly away from the mounting seat 1 is fixedly connected to the fixed plate 14 at the end of the airbag. The first hydraulic cylinder 3 is extended and retracted in the front-to-back direction to drive the support assembly to move forward and backward in the axial direction of the airbag, so as to realize the axial expansion or contraction of the airbag.

[0030] The radial extension structure includes a support plate 10, which includes a sliding block 11 that can move in a radial direction. The end of the sliding block 11 away from the central axis of the support plate 10 is used to press the airbag against the tunnel wall. The radial extension structure also includes a second driving structure that drives the sliding block 11 to move radially along the support plate 10. The second driving structure drives the sliding block 11 to move radially along the support plate 10 to achieve radial expansion or contraction of the airbag.

[0031] The support assembly includes a first mounting plate 5, which is fixedly connected to the end of the first hydraulic cylinder 3 away from the mounting seat 1, and a guide rod 6 is fixedly connected between the first mounting plate 5 and the fixed plate 14. A plurality of guide rods 6 are evenly arranged around the circumference of the first mounting plate 5, and a avoidance hole 19 for the guide rod 6 to pass through is provided in the middle of the support plate 10. The support assembly can ensure the stability of the support assembly structure by fixing the guide rod 6 between the first mounting plate 5 and the fixed plate 14, so that the support assembly can drive the fixed plate 14 at the end of the airbag to extend and retract forward and backward during the forward and backward extension of the first hydraulic cylinder 3, thereby facilitating the axial extension and retraction adjustment of the airbag. Four first hydraulic cylinders 3 are evenly arranged around the circumference of the first mounting plate 5, and the second hydraulic cylinder 4 is arranged at the center of the circle where the four first hydraulic cylinders 3 are located.

[0032] A connecting rod 7 is fixed to one end of the second driving structure away from the mounting seat 1, and a through hole is provided in the center of the first mounting plate 5 for the connecting rod 7 to pass through; a top pressure plate 8 is fixed to one end of the connecting rod 7 away from the second driving structure, and a through hole is provided in the circumferential direction of the top pressure plate 8 for the guide rod 6 to pass through, and a spring 9 is sleeved on the rod section of the guide rod 6 between the fixed plate 14 and the top pressure plate 8, a first connecting rod 12 is hingedly connected between the fixed plate 14 and the sliding block 11, and a second connecting rod 13 is hingedly connected between the top pressure plate 8 and the sliding block 11; through the second driving structure The extension and retraction in the front-back direction can drive the connecting rod 7 and the pressure plate 8 to press the spring 9 on the guide rod 6. At the same time, when the pressure plate 8 moves toward the fixed plate 14, the distance between the pressure plate 8 and the support plate 10 and the distance between the fixed plate 14 and the support plate 10 change, so that the first connecting rod 12 and the second connecting rod 13 jointly push the sliding block 11 on the support plate 10, so that the sliding block 11 moves along the radial direction of the support plate 10, so that the sliding block 11 expands or contracts the airbag in the radial direction, so that the airbag is pressed against the tunnel wall by the sliding block 11. In this embodiment, the second driving structure is a second hydraulic cylinder 4 fixed between the mounting seat 1 and the connecting rod 7.

[0033] In order to facilitate the movement of the sliding block 11 relative to the support plate 10, in this embodiment, the front and rear sides of the support plate 10 are respectively provided with a front guide groove 18 and a rear guide groove, and the sliding block 11 includes a front guide portion 21 adapted to slide with the front guide groove 18, a rear guide portion 22 adapted to slide with the rear guide groove, and a connecting portion 23 fixedly connected to the front guide portion 21 and the rear guide portion 22. The front guide portion 21, the rear guide portion 22, and the connecting portion 23 form an inverted U-shaped structure, and the connecting portion 23 is used to press the airbag. In this embodiment, eight sliding blocks 11 are evenly distributed in the circumference of the support plate 10. In this embodiment, the first connecting rod 12 and the second connecting rod 13 can respectively apply a force in the front and rear directions of the sliding block 11, so that when the sliding block 11 moves radially outward or inward along the support plate 10, the sliding block 11 is symmetrically subjected to force in the front and rear directions, thereby ensuring the stability of the movement of the sliding block 11 relative to the support plate 10.

[0034] In this embodiment, the cross-sectional shapes of the front guide groove 18 and the rear guide groove are both dovetail grooves, and the front guide portion 21 includes a guide block 26 adapted to guide and slide with the dovetail-shaped front guide groove 18 and a protrusion 20 integrally formed with the guide block 26, the protrusion 20 protrudes from the front surface of the support plate 10, and one end of the second connecting rod 13 is hingedly connected to the protrusion 20; the rear guide portion 22 includes a guide block 26 adapted to guide and slide with the dovetail-shaped rear guide groove and a protrusion 20 integrally formed with the guide block 26, the protrusion 20 protrudes from the rear surface of the support plate 10, and one end of the first connecting rod 12 is hingedly connected to the protrusion 20. The structural setting of the dovetail groove can not only guide the sliding block 11, but also prevent the sliding block 11 from detaching from the guide groove.

[0035] The airbag in the present invention includes a cylindrical section and a hemispherical structure arranged at the front and rear ends of the cylindrical section, and a fixed disk 14 is fixed to the hemispherical structure corresponding to the central axis of the airbag; in this embodiment, the cylindrical section of the airbag is an inner layer 25 and an outer layer 24 arranged at intervals outside the inner layer 25, and a gas interlayer for filling high-pressure gas is formed between the inner layer 25 and the outer layer 24. Specifically, when the cylindrical section of the airbag is cut in a vertical plane passing through the central axis of the airbag, a plurality of annular channels 17 with regular hexagonal cross-sections are formed between the inner layer 25 and the outer layer 24, and the annular channels are connected and arranged in the axial direction of the airbag; the edges and corners of the regular hexagonal annular channels 17 are arranged toward the outer layer 24, so that after the gas interlayer is filled with high-pressure gas, a plurality of annular extrusion belts are formed in the axial direction of the airbag, and the formed plurality of annular extrusion belts can make the airbag generate a strong extrusion force with the tunnel wall at the annular extrusion belt, thereby increasing the friction between the airbag and the tunnel wall, and ensuring the stability of the airbag in the tunnel.

[0036] The hemispherical structure of the airbag is connected to the cylindrical section, and the hemispherical structure includes an inner wall layer 16 and an outer wall layer 15 spaced outside the inner wall layer 16. A gas interlayer filled with high-pressure gas is formed between the inner wall layer 16 and the outer wall layer 15. The thickness of the outer wall layer 15 is greater than that of the inner wall layer 16. The hemispherical structure of the airbag is arranged as a double-layer structure, which facilitates the connection between the gas interlayer of the hemispherical structure and the gas interlayer of the cylindrical section. In addition, the outer wall layer 15 is arranged as a thicker structure, which can increase the compressive resistance of the hemispherical structure of the airbag, thereby increasing the structural strength of the load-facing side of the airbag, so that the load-facing side can resist strong water pressure.

[0037] In this embodiment, a first air inlet (not shown in the figure) is provided on the fixed disk 14 for gas to enter, and a second air inlet (not shown in the figure) is provided on the hemispherical structure of the airbag for inflating the gas interlayer of the airbag. In this embodiment, the gas pressure in the gas interlayer is greater than the gas pressure inside the airbag; the first air inlet and the second air inlet are respectively provided, which can facilitate the attempt to inflate or deflate the airbag and the gas interlayer at the same time.

[0038] The blocking airbag of the present invention includes a controller, a displacement sensor is provided on the tunnel wall, and a pressure sensor is provided on the load-facing side of the airbag. The displacement sensor is control-connected to the controller, and the pressure sensor is control-connected to the controller. When the displacement sensor detects that the airbag slips in the tunnel, or the pressure sensor detects that the pressure on the load-facing side of the airbag is large (a rated pressure on the load-facing side can be set, and the pressure detected by the pressure sensor is greater than the rated pressure), the displacement sensor or the pressure sensor will give a signal to the controller, and the controller controls the action of the first hydraulic cylinder and the second hydraulic cylinder to achieve rapid retraction of the airbag. When in use, the circumferential support structure on the mounting seat 1 is first extended so that the end of the circumferential support structure away from the mounting seat 1 is pressed against the tunnel wall, so that the middle part of the airbag is relatively fixed on the tunnel wall, and then the first hydraulic cylinder 3 is extended in the front-to-back direction to drive the support assembly to move in the front-to-back direction, thereby pressing the fixed plate 14 at the end of the airbag forward or backward to achieve axial extension of the airbag; then the second hydraulic cylinder is extended in the front-to-back direction, the second hydraulic cylinder drives the connecting rod 7 to move forward and backward, and the connecting rod 7 drives the pressing plate 8 to move forward and backward, so that the pressing plate 8 presses the spring 9, at this time, the pressing plate 8 and the fixed plate 14 are in contact with each other. The distance between the two plates becomes smaller. Under the joint action of the first connecting rod 12 and the second connecting rod 13, the support plate 10 is located between the top pressure plate and the fixed plate 14, and the sliding block 11 on the support plate 10 moves radially along the support plate 10, so that the sliding block 11 presses against the tunnel wall to realize the radial expansion or contraction of the airbag; when the airbag is to be stored, the radial contraction of the airbag is first achieved by the second hydraulic cylinder, and then the axial contraction of the airbag is achieved by the first hydraulic cylinder 3. When the airbag is stored, the first air inlet and the second air inlet respectively deflate the airbag, thereby realizing the rapid storage of the airbag.

[0039] In the above embodiment, the support assembly includes a first mounting plate, which is fixedly connected to an end of the first driving structure away from the mounting seat, and a guide rod is fixedly connected between the first mounting plate and the fixed plate, and a plurality of guide rods are evenly distributed around the circumference of the first mounting plate, and an avoidance hole for the guide rod to pass through is opened in the middle of the support plate; in other embodiments, the support plate can also have avoidance holes corresponding to the guide rods.

[0040] In the above embodiment, a connecting rod is fixed to the end of the second driving structure away from the mounting seat, and a through hole for the connecting rod to pass through is opened in the center of the first mounting plate; a top pressure plate is fixed to the end of the connecting rod away from the second driving structure, and a through hole for the guide rod to pass through is opened on the circumferential corresponding guide rod of the top pressure plate, and a spring is sleeved on the guide rod between the fixed plate and the top pressure plate, a first connecting rod is hingedly connected between the fixed plate and the sliding block, and a second connecting rod is hingedly connected between the top pressure plate and the sliding block; in other embodiments, the connecting rod may not be provided, and the end of the second driving structure away from the mounting seat is directly fixedly connected to the top pressure plate.

[0041] In the above embodiment, a front guide groove and a rear guide groove are respectively provided on the front and rear sides of the support plate, and the sliding block includes a front guide portion adapted to slide with the front guide groove, a rear guide portion adapted to slide with the rear guide groove, and a connecting portion fixedly connected with the front guide portion and the rear guide portion; the front guide portion, the rear guide portion, and the connecting portion form an inverted U-shaped structure, and the connecting portion is used to press the airbag; in other embodiments, the front guide groove can be set only on the front side of the support plate, and the sliding block is only set to slide with the front guide groove; or the rear guide groove can be set only on the rear side of the support plate, and the sliding block is only set to slide with the rear guide groove.

[0042] In the above embodiments, the cross-sectional shapes of the front guide groove and the rear guide groove are both dovetail grooves; in other embodiments, the cross-sectional shapes of the front guide groove and the rear guide groove may also be T-shaped; or the cross-sectional shape of the front guide groove is T-shaped, and the cross-sectional shape of the rear guide groove is dovetail-shaped; or the cross-sectional shape of the front guide groove is dovetail-shaped, and the cross-sectional shape of the rear guide groove is T-shaped.

[0043] In the above embodiment, the front guide portion includes a guide block adapted to slide with the dovetail-shaped front guide groove and a protrusion integrally formed with the guide block, and the rear guide portion includes a guide block adapted to slide with the dovetail-shaped rear guide groove and a protrusion integrally formed with the guide block; in other embodiments, the front guide portion is a guide block adapted to slide with the dovetail-shaped front guide groove, and the rear guide portion is a guide block adapted to slide with the dovetail-shaped rear guide groove.

[0044] In the above embodiment, the cylindrical section of the airbag is an inner layer and an outer layer spaced outside the inner layer, and a gas interlayer for filling high-pressure gas is formed between the inner layer and the outer layer; in other embodiments, the cylindrical section of the airbag can also be a single-layer structure.

[0045] In the above embodiment, a plurality of annular channels with a regular hexagonal cross-sectional shape are formed between the inner layer and the outer layer, and the annular channels are connected in the axial direction of the airbag; the edges and corners of the regular hexagonal annular channels face the outer layer, so as to form a plurality of annular extrusion belts in the axial direction of the airbag after the gas interlayer is filled with high-pressure gas; in other embodiments, a plurality of annular channels with a circular cross-sectional shape are formed between the inner layer and the outer layer, and the annular channels are connected in the axial direction of the airbag.

[0046] In the above embodiment, the hemispherical structure includes an inner wall layer and an outer wall layer spaced apart on the outside of the inner wall layer, and a gas interlayer filled with high-pressure gas is formed between the inner wall layer and the outer wall layer, and the thickness of the outer wall layer is greater than the thickness of the inner wall layer; in other embodiments, the hemispherical structure of the airbag can also be a single-layer structure.

Claims

1. A fast-closing tunnel plugging airbag, characterized in that: include: A mounting seat is arranged in the airbag, the mounting seat is a cylindrical structure whose central axis extends in the front-rear direction, and the mounting seat is axially arranged in the middle of the airbag; A circumferential support structure is arranged on the circumference of the mounting seat, and one end of the circumferential support structure away from the mounting seat is fixedly connected to the airbag; The extension mechanism is symmetrically arranged on the left and right sides of the mounting seat; The stretching mechanism includes an axial stretching structure and a radial stretching structure; The axial extension structure includes a first driving structure fixedly connected to the mounting seat, and a support assembly fixedly connected to the first driving structure. One end of the support assembly away from the mounting seat is fixedly connected to a fixed plate at the end of the airbag. The first driving structure drives the support assembly to move forward and backward in the axial direction of the airbag to realize the expansion or contraction of the airbag in the axial direction. The radial extension structure includes a support plate, which is arranged at the connection between the cylindrical section of the airbag and the hemispherical structure. The central axis of the support plate coincides with the central axis of the airbag. The support plate includes a sliding block that can move in a radial direction. The end of the sliding block away from the central axis of the support plate is used to press the airbag against the tunnel wall. The radial extension structure also includes a second driving structure that drives the sliding block to move radially in the support plate. The second driving structure drives the sliding block to move radially along the support plate to realize the radial expansion or contraction of the airbag.

2. The fast-collapsed tunnel plugging airbag according to claim 1, characterized in that: The support assembly includes a first mounting plate, which is fixedly connected to an end of the first driving structure away from the mounting seat, a guide rod is fixedly connected between the first mounting plate and the fixed plate, and a plurality of guide rods are evenly distributed around the circumference of the first mounting plate, and an avoidance hole for the guide rod to pass through is opened in the middle of the support plate.

3. The fast-collapsed tunnel plugging airbag according to claim 2, characterized in that: A connecting rod is fixed to the end of the second driving structure away from the mounting seat, and a through hole for the connecting rod to pass through is opened in the center of the first mounting plate; a top pressure plate is fixed to the end of the connecting rod away from the second driving structure, and a through hole for the guide rod to pass through is opened in the circumferential direction of the top pressure plate corresponding to the guide rod, and a spring is sleeved on the guide rod between the fixed plate and the top pressure plate, a first connecting rod is hingedly connected between the fixed plate and the sliding block, and a second connecting rod is hingedly connected between the top pressure plate and the sliding block.

4. The fast-collapsed tunnel plugging airbag according to claim 3, characterized in that: The front and rear sides of the support plate are respectively provided with a front guide groove and a rear guide groove, and the sliding block includes a front guide part adapted for sliding with the front guide groove, a rear guide part adapted for sliding with the rear guide groove, and a connecting part fixedly connected with the front guide part and the rear guide part; the front guide part, the rear guide part, and the connecting part form an inverted U-shaped structure, and the connecting part is used for pressing the airbag.

5. The fast-collapsed tunnel plugging airbag according to claim 4, characterized in that: The cross-sectional shapes of the front guide groove and the rear guide groove are both dovetail grooves. The front guide part includes a guide block that is slidably adapted to the guide of the dovetail-shaped front guide groove and a protrusion that is integrally formed with the guide block. The rear guide part includes a guide block that is slidably adapted to the guide of the dovetail-shaped rear guide groove and a protrusion that is integrally formed with the guide block.

6. A fast-folding tunnel plugging airbag according to any one of claims 1 to 5, characterized in that: The circumferential support structure comprises a plurality of telescopic rods evenly arranged in the circumferential direction of the mounting seat, arc-shaped plates are fixed to the ends of the telescopic rods, and the airbags are fixedly connected to the arc-shaped plates.

7. A fast-collapsed tunnel plugging airbag according to any one of claims 1 to 5, characterized in that: The cylindrical section of the airbag comprises an inner layer and an outer layer arranged at intervals outside the inner layer, and a gas sandwich layer for filling high-pressure gas is formed between the inner layer and the outer layer.

8. The fast-collapsed tunnel plugging airbag according to claim 7, characterized in that: A plurality of annular channels with regular hexagonal cross-sections are formed between the inner layer and the outer layer, and the annular channels are connected in the axial direction of the airbag; the edges and corners of the regular hexagonal annular channels face the outer layer, so that a plurality of annular extrusion belts are formed in the axial direction of the airbag after the gas interlayer is filled with high-pressure gas.

9. The fast-collapsed tunnel plugging airbag according to claim 7, characterized in that: The hemispherical structure of the airbag is connected to the cylindrical section, and includes an inner wall layer and an outer wall layer spaced outside the inner wall layer. A gas interlayer filled with high-pressure gas is formed between the inner wall layer and the outer wall layer, and the thickness of the outer wall layer is greater than that of the inner wall layer.

10. The fast-collapsed tunnel plugging airbag according to claim 7, characterized in that: The fixing plate is provided with a first air inlet for gas to enter, and the hemispherical structure of the airbag is provided with a second air inlet for inflating the air interlayer of the airbag.

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