Mud concentration monitoring device

Abstract

The utility model discloses a kind of mud concentration monitoring devices, including vehicle body, spectral water quality sensor, two wheel groups, two transmission mechanisms, power supply mechanism, receiver. Among them, spectral water quality sensor is set on the outer wall of vehicle body;Two wheel groups are symmetrically set on vehicle body, and wheel group includes multiple wheels, and the lower edge of wheel group is lower than the bottom surface of vehicle body;Two transmission mechanisms are symmetrically set in vehicle body and are linked and installed with wheel group;Power supply mechanism is fixedly installed in vehicle body;Receiver is set on vehicle body.The utility model can be realized in different monitoring position to carry out mud concentration real-time remote monitoring.

Description

Technical Field

[0001] This utility model belongs to the field of mud concentration monitoring technology, and specifically relates to a mud concentration monitoring device. Background Technology

[0002] With increasing environmental awareness, the importance of environmentally friendly dredging of sediments (also known as bottom mud) at the bottom of water bodies (such as rivers and lakes) is becoming increasingly prominent. However, upon reviewing existing technologies, current monitoring devices for the concentration of dredged sediment in environmentally friendly dredging have significant shortcomings:

[0003] Lack of remote control capability: Operators have difficulty remotely operating and controlling the monitoring device from a safe area far from the dredging site, resulting in low dredging efficiency.

[0004] Fixed monitoring locations and insufficient flexibility: Existing devices are usually deployed in fixed locations and cannot be flexibly adjusted or deployed at multiple locations as needed, making it difficult to comprehensively and dynamically monitor the mud concentration distribution at different locations and depths in the water.

[0005] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a mud concentration monitoring device.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] The purpose of this invention is to provide a mud concentration monitoring device that enables real-time remote monitoring of mud concentration at different monitoring locations.

[0008] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0009] A mud concentration monitoring device, the mud concentration monitoring device comprising:

[0010] Body;

[0011] A spectral water quality sensor is installed on the outer wall of the vehicle body;

[0012] Two wheel sets are symmetrically arranged on the vehicle body. Each wheel set includes multiple wheels, and the lower edge of the wheel set is lower than the bottom surface of the vehicle body.

[0013] Two transmission mechanisms are symmetrically arranged in the vehicle body and are linked to the wheel assembly;

[0014] The power supply mechanism is fixedly installed in the vehicle body;

[0015] The receiver is mounted on the vehicle body.

[0016] In one or more embodiments of the present invention, the vehicle body includes a base, two end plates disposed opposite to each other on the base along a first direction, and two side plates disposed opposite to each other on the base along a second direction, wherein the first direction and the second direction are perpendicular to each other, and the wheel assembly is disposed on the outer wall of the side plates.

[0017] In one or more embodiments of this utility model, the spectral water quality sensor is disposed on the outer wall of the end plate, and the receiver is disposed on the inner wall of the end plate; and / or,

[0018] The vehicle body also includes cover plates disposed on the end plates and side plates; and / or,

[0019] The wheel has ridges evenly distributed circumferentially on its peripheral wall.

[0020] In one or more embodiments of this utility model, the transmission mechanism includes a rotary motor fixedly mounted on the base, a drive wheel fixedly mounted with the output shaft of the rotary motor, a plurality of driven wheels linked to the wheel, and a transmission belt linking the drive wheel and the driven wheels.

[0021] In one or more embodiments of this utility model, the transmission mechanism further includes a support frame, the support frame including a top frame disposed above the conveyor belt, two side frames disposed opposite each other, and a mounting part bent with the side frames. The mounting part is fixedly installed with the base. The two side frames are respectively disposed on both sides of the drive wheel. The rotary motor is fixedly installed on the side frames. The output shaft of the rotary motor passes through the side frames. A first bearing is provided between the output shaft and the side frames.

[0022] In one or more embodiments of this utility model, the wheel and the driven wheel are linked together by a connecting shaft passing through the side plate, and a second bearing is provided between the connecting shaft and the side plate.

[0023] In one or more embodiments of this utility model, a sealing gasket is provided between the second bearing and the side plate.

[0024] In one or more embodiments of this utility model, the device further includes:

[0025] The airbag is fixedly installed on the outer wall of the vehicle body. On the plane where the bottom surface of the vehicle body is located, the orthographic projection of the airbag is separate from the orthographic projection of the spectral water quality sensor.

[0026] An air supply mechanism is fixedly installed in the vehicle body and connected to the airbag.

[0027] In one or more embodiments of this utility model, the airbag includes a first airbag and a second airbag arranged symmetrically. The first airbag and the second airbag are respectively disposed on two opposite outer side walls of the vehicle body, and the center line connecting the first airbag and the second airbag is coplanar with the axis of the vehicle body in a second direction.

[0028] In one or more embodiments of the present invention, the air supply mechanism includes a pump body disposed in the vehicle body and an air guide pipe connecting the pump body and the airbag. The air guide pipe includes a first conduit connected to the pump body, a second conduit connecting the first conduit and the first airbag, and a third conduit connecting the first conduit and the second airbag.

[0029] Compared with existing technologies, the mud concentration monitoring device of this invention has the following advantages: operators can remotely control the device from a safe area, precisely guiding it into the river operation area; the spectral water quality sensor mounted on the vehicle can monitor mud concentration in real time and at multiple points. Based on this monitoring data, operators can dynamically optimize dredging parameters and operational strategies, effectively avoiding over-dredging, thereby minimizing disturbance to the riverbed and aquatic ecosystem. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional structural diagram of the mud concentration monitoring device in one embodiment of the present invention;

[0032] Figure 2 This is a three-dimensional structural diagram of the mud concentration monitoring device with the cover plate removed in one embodiment of the present invention;

[0033] Figure 3 This is a three-dimensional structural diagram of the wheel and transmission mechanism in one embodiment of the present invention;

[0034] Figure 4 for Figure 3 Enlarged view of the local structure at point A;

[0035] Figure 5 This is a three-dimensional structural diagram of the airbag and air supply mechanism in one embodiment of the present invention.

[0036] Explanation of key figure labels:

[0037] 1-Body; 11-Base; 12-End plate; 13-Side plate; 14-Cover plate;

[0038] 2-Spectral water quality sensor;

[0039] 3-Wheel; 31-Ribbon;

[0040] 4-Transmission mechanism; 41-Rotary motor; 410-Output shaft; 42-Driving wheel; 43-Driven wheel; 44-Transmission belt; 45-Support frame; 451-Top frame; 452-Side frame; 453-Mounting part; 450-First bearing; 46-Connecting shaft; 47-Second bearing; 48-Sealing gasket; 49-Fixing plate; 491-Third bearing;

[0041] 5-Power supply mechanism;

[0042] 6- Receiver;

[0043] 7-Airbags;

[0044] 8-Gas supply mechanism; 81-Pump body; 82-Gas guide pipe; 821-First guide pipe; 822-Second guide pipe; 823-Third guide pipe. Detailed Implementation

[0045] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0048] The technical solution of this utility model will now be described with reference to the accompanying drawings.

[0049] Reference Figures 1-3As shown, the mud concentration monitoring device in this embodiment may include a vehicle body 1, a spectral water quality sensor 2, two wheel sets, two transmission mechanisms 4, a power supply mechanism 5, and a receiver 6. The spectral water quality sensor 2 can be mounted on the outer wall of the vehicle body 1; the two wheel sets are symmetrically arranged on the vehicle body 1, and each wheel set may include multiple wheels 3, with the lower edge of the wheel set below the bottom surface of the vehicle body 1; the two transmission mechanisms 4 are symmetrically arranged in the vehicle body 1 and are linked to the wheel sets; the power supply mechanism 5 (such as a battery pack) is fixedly installed in the vehicle body 1 to supply power to the transmission mechanisms 4, the spectral water quality sensor 2, and the receiver 6; the receiver 6 can be mounted on the vehicle body 1. Based on this design, radio waves can be emitted via a remote control (such as a mobile phone, which contains a transmitter that works with the receiver 6). After receiving the radio waves, the receiver 6 decodes them to generate a drive signal to drive the transmission mechanisms 4, thereby moving the entire device. Operators can remotely control the device from a safe area, precisely guiding it into the river operation area. The spectral water quality sensor 2 mounted on the vehicle body 1 can monitor the mud concentration in real time and at multiple points. Based on this monitoring data, operators can dynamically optimize dredging parameters and operational strategies to effectively avoid over-dredging, thereby minimizing disturbance to the riverbed and aquatic ecosystem.

[0050] Specifically, refer to Figure 1 As shown, the vehicle body 1 in this embodiment may include a base 11, two end plates 12 disposed opposite to each other on the base 11 along a first direction (i.e., the length direction of the vehicle body 1), and two side plates 13 disposed opposite to each other on the base 11 along a second direction (i.e., the width direction of the vehicle body 1). The base 11 has a large flat plate design. The wheel assembly can be disposed on the outer wall of the side plate 13, the spectral water quality sensor 2 can be disposed on the outer wall of the end plate 12 (front end plate), and the receiver 6 can be disposed on the inner wall of the end plate 12. When the contact area between the base 11 and the mud is large enough, it is beneficial to disperse the pressure of the entire device, making it easier for the mud to maintain surface support, thereby allowing the vehicle body 1 to float on the surface of the mud instead of sinking into the mud. The design of four wheels 3 can help the drive device to move on the mud and avoid jamming.

[0051] To prevent muddy or semi-liquid fluids from splashing into the vehicle body 1 during operation, thus protecting the internal structure, reducing the cleaning burden on the vehicle body 1, and preventing internal transmission mechanisms 4 and power supply mechanisms 5 from being soaked in mud and corroding, thereby ensuring the service life of the device, refer to... Figure 1 As shown, the vehicle body 1 in this embodiment may also include a cover plate 14 covering the end plate 12 and the side plate 13.

[0052] To facilitate the rotation of drive wheel 3, refer to Figure 2 , Figure 3As shown, the transmission mechanism 4 in this embodiment may include a rotary motor 41 fixedly mounted on the base 11, a drive wheel 42 fixedly mounted on the output shaft 410 of the rotary motor 41, multiple driven wheels 43 linked to the wheel 3, and a transmission belt 44 linking the drive wheel 42 and the driven wheels 43. Powered by the power supply mechanism 5, the rotary motor 41 rotates, thereby driving the output shaft 410 to rotate. The output shaft 410 drives the drive wheel 42 to rotate, and the drive wheel 42 drives the driven wheels 43 to rotate via the transmission belt 44. The driven wheels 43 then drive the wheel 3 to rotate. Gears are provided on the drive wheel 42 and the driven wheels 43, and the transmission belt 44 has toothed grooves that mesh with the gears. During transmission, the gears and toothed grooves mesh and transmit power. The two rotary motors 41 inside the vehicle body 1 can be independently controlled, thereby coordinating the operation of the motors under different water conditions (such as shallow water or deep water areas) to enhance the stability of the vehicle body 1 and reduce tilting or loss of control caused by water flow impact or terrain changes.

[0053] It should be noted that there are two transmission mechanisms 4, each linked to a corresponding wheel set. For example, in this embodiment, the first transmission mechanism 4 is linked to the first wheel set located on the left side of the vehicle body 1, and the second transmission mechanism 4 is linked to the second wheel set located on the right side of the vehicle body 1. Each transmission mechanism 4 can operate independently; that is, the rotary motor 41 in the two transmission mechanisms 4 in this embodiment can output the same or different speeds. For example, when the left wheel 3 and the right wheel rotate at the same speed, the device moves straight. When the speed of the left wheel 3 is greater than that of the right wheel, the left wheel 3 (outer side) rotates faster, generating a greater force pushing the vehicle body 1 forward and to the left. The right wheel 3 (inner side) rotates slower, generating less thrust, and may even produce a slight braking effect, causing the resultant force on the vehicle to no longer point directly forward, but to the right front, ultimately causing the vehicle to turn right. The turning radius depends on the magnitude of the speed difference. If the speed difference is small, the vehicle will turn right slowly with a larger radius; if the speed difference is large, the vehicle will turn sharply with a smaller radius, and may even rotate to the right in place. Therefore, it is understood that the transmission mechanism 4 in this embodiment does not have a servo motor for changing the direction of the wheel 3. Of course, this application is not limited to this; a servo motor can also be installed in the transmission mechanism 4 in other embodiments to directly change the direction of the wheel 3.

[0054] To facilitate the fixed installation of the rotary motor 41 and the base 11, refer to... Figure 2 , Figure 3As shown, the transmission mechanism 4 in this embodiment may further include a support frame 45. The support frame 45 may include a top frame 451 disposed above the conveyor belt 44, two side frames 452 disposed opposite each other, and a mounting part 453 bent to the side frames 452. The mounting part 453 is fixedly installed to the base 11 by fasteners such as screws and bolts. The two side frames 452 may be respectively disposed on both sides of the drive wheel 42. The rotary motor 41 is fixedly installed on the side frames 452. The output shaft 410 of the rotary motor 41 may be disposed through the side frames 452. A first bearing 450 may be provided between the output shaft 410 and the side frames 452. The top frame 451 and the two side frames 452 enclose a receiving space. The drive wheel 42 is disposed in the receiving space, and the rotary motor 41 is disposed outside the receiving space. The design of the first bearing 450 can reduce the frictional resistance between the output shaft 410 of the rotary motor 41 and the side frames 452 when rotating, which is beneficial to the transmission of the transmission mechanism 4 and reduces energy waste.

[0055] For ease of installation of the drive wheel 42, refer to... Figures 2-4 As shown, in this embodiment, the wheel 3 and the driven wheel 43 are linked and installed together via a connecting shaft 46. The connecting shaft 46 can pass through the side plate 13, and a second bearing 47 can be provided between the connecting shaft 46 and the side plate 13. The design of the second bearing 47 can reduce the frictional resistance between the connecting shaft 46 and the side plate 13. Specifically, in order to maintain the structural stability of the device, a fixed seat is also provided on the base 11 in this embodiment. The connecting shaft 46 includes a first end, a second end, a third end located between the first end and the second end, and a fourth end located between the first end and the third end. The first end of the connecting shaft 46 is fixedly installed with the wheel 3, the third end of the connecting shaft 46 is fixedly installed with the driven wheel 43, the second end of the connecting shaft 46 is inserted into the fixed plate 49, and the fourth end of the connecting shaft 46 passes through the side plate 13. In order to reduce the frictional resistance between the fixed plate 49 and the connecting shaft 46, a third bearing 491 is provided between the fixed plate 49 and the connecting shaft 46 in this embodiment.

[0056] Preferably, refer to Figures 2-4 As shown, a sealing gasket 48 may be provided between the second bearing 47 and the side plate 13 in this embodiment. The design of the sealing gasket 48 can minimize the probability of fluids or semi-fluids containing mud entering the interior of the vehicle body 1, reduce the cleaning burden inside the vehicle body 1, prevent the internal transmission mechanism 4, power supply mechanism 5, etc. from being wetted by mud and corroding, and ensure the service life of the device.

[0057] To facilitate movement in the mud, refer to Figure 1 As shown, in this embodiment, the wheel 3 has convex ridges 31 evenly distributed along the circumferential direction on its peripheral wall. The design of wide-spaced deep grooves can quickly dissipate mud and prevent it from getting stuck, thereby avoiding slippage of the wheel 3 during travel and improving the travel efficiency of the wheel 3.

[0058] To avoid the device sinking into the mud and increasing the difficulty of travel, refer to Figure 2 and combined Figure 5 As shown, the device in this embodiment may further include an airbag 7 and an air supply mechanism 8. The airbag 7 can be fixedly installed on the outer wall of the vehicle body 1, and its orthographic projection on the plane containing the bottom surface of the vehicle body 1 is separate from the orthographic projection of the spectral water quality sensor 2. The air supply mechanism 8 can be fixedly installed in the vehicle body 1 and communicates with the airbag 7. According to this design, the airbag 7 is inflated by the operation of the air supply mechanism 8, thereby increasing the buoyancy of the vehicle body 1 in the mud and reducing the risk of accidents caused by water flow impact or vehicle body 1 shaking. The airbag 7 can be disposed on the side plate 13 of the vehicle body 1, and the air supply mechanism 8 is mounted on the base 11. The side plate 13 has a through hole connecting the airbag 7 and the air supply mechanism 8.

[0059] Specifically, in order to ensure the balance of the device and prevent it from tilting or tipping over, refer to Figure 2 and combined Figure 5 As shown, the airbag 7 in this embodiment may include a first airbag 7 and a second airbag 7 arranged symmetrically. The first airbag 7 and the second airbag 7 may be respectively arranged on two opposite outer side walls of the vehicle body 1. The center line connecting the first airbag 7 and the second airbag 7 may be coplanar with the axis of the vehicle body 1 in the second direction.

[0060] To facilitate the supply of air to the first airbag 7 and the second airbag 7, refer to Figure 2 and combined Figure 5 As shown, the air supply mechanism 8 in this embodiment may include a pump body 81 (such as an air pump) disposed in the vehicle body 1 and an air guide pipe 82 connecting the pump body 81 and the airbag 7. The air guide pipe 82 may include a first conduit 821 connected to the pump body 81, a second conduit 822 connecting the first conduit 821 and the first airbag 7, and a third conduit 823 connecting the first conduit 821 and the second airbag 7. Specifically, the first airbag 7 is sealed and installed on the outer wall of the side plate 13, and a first through hole is opened on the side plate 13. The second conduit 822 is inserted into the second through hole. The second airbag 7 is sealed and installed on the outer wall of the other side plate 13 and is symmetrically arranged with the first airbag 7. A second through hole is opened on the other side plate 13, and the third conduit 823 is inserted into the third through hole.

[0061] The rotary motor 41 in this application can be a DC motor, an AC asynchronous motor, an AC synchronous motor, or other rotary motor 41 with rotary drive function.

[0062] It should be noted that the structures and working principles of the spectral water quality sensor 2, receiver 6, gas supply mechanism 8, etc., which are not described in detail in this application, can all adopt existing solutions in the prior art, which can be understood and accepted by those skilled in the art, and therefore will not be described in detail.

[0063] In the description of the embodiments of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0064] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0065] In the description of the embodiments of this utility model, it should also be noted that the terms "first" and "second" used herein do not specifically refer to any order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0066] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mud concentration monitoring device, characterized in that, The mud concentration monitoring device includes: Body (1); A spectral water quality sensor (2) is installed on the outer wall of the vehicle body (1); Two sets of wheels (3) are symmetrically arranged on the vehicle body (1). The sets of wheels (3) include multiple wheels (3). The lower edge of the sets of wheels (3) is lower than the bottom surface of the vehicle body (1). Two transmission mechanisms (4) are symmetrically arranged in the vehicle body (1) and are linked to the wheel (3) group; The power supply mechanism (5) is fixedly installed in the vehicle body (1); A receiver (6) is disposed on the vehicle body (1).

2. The mud concentration monitoring device according to claim 1, characterized in that, The vehicle body (1) includes a base (11), two end plates (12) disposed opposite to each other on the base (11) in a first direction, and two side plates (13) disposed opposite to each other on the base (11) in a second direction. The first direction and the second direction are perpendicular to each other, and the wheel (3) group is disposed on the outer wall of the side plate (13).

3. The mud concentration monitoring device according to claim 2, characterized in that, The spectral water quality sensor (2) is disposed on the outer wall of the end plate (12), and the receiver (6) is disposed on the inner wall of the end plate (12); and / or, The vehicle body (1) further includes a cover plate (14) covering the end plate (12) and the side plate (13); and / or, The wheel (3) has convex ridges (31) evenly distributed along the circumferential direction on its peripheral wall.

4. The mud concentration monitoring device according to claim 2, characterized in that, The transmission mechanism (4) includes a rotary motor (41) fixedly mounted on the base (11), a drive wheel (42) fixedly mounted on the output shaft (410) of the rotary motor (41), a plurality of driven wheels (43) linked to the wheel (3), and a transmission belt (44) linking the drive wheel (42) and the driven wheels (43).

5. The mud concentration monitoring device according to claim 4, characterized in that, The transmission mechanism (4) further includes a support frame (45), which includes a top frame (451) disposed above the conveyor belt (44), two side frames (452) disposed opposite to each other, and a mounting part (453) bent with the side frames (452). The mounting part (453) is fixedly installed with the base (11). The two side frames (452) are respectively disposed on both sides of the drive wheel (42). The rotary motor (41) is fixedly installed on the side frame (452). The output shaft (410) of the rotary motor (41) passes through the side frame (452). A first bearing (450) is provided between the output shaft (410) and the side frame (452).

6. The mud concentration monitoring device according to claim 4, characterized in that, The wheel (3) and the driven wheel (43) are connected by a connecting shaft (46) that passes through the side plate (13), and a second bearing (47) is provided between the connecting shaft (46) and the side plate (13).

7. The mud concentration monitoring device according to claim 6, characterized in that, A sealing gasket (48) is provided between the second bearing (47) and the side plate (13).

8. The mud concentration monitoring device according to claim 1, characterized in that, The device further includes: The airbag (7) is fixedly installed on the outer wall of the vehicle body (1). On the plane where the bottom surface of the vehicle body (1) is located, the orthographic projection of the airbag (7) is separated from the orthographic projection of the spectral water quality sensor (2). An air supply mechanism (8) is fixedly installed in the vehicle body (1) and connected to the airbag (7).

9. The mud concentration monitoring device according to claim 8, characterized in that, The airbag (7) includes a first airbag (7) and a second airbag (7) arranged symmetrically. The first airbag (7) and the second airbag (7) are respectively disposed on two opposite outer side walls of the vehicle body (1). The center line connecting the first airbag (7) and the second airbag (7) is coplanar with the axis of the vehicle body (1) in the second direction.

10. The mud concentration monitoring device according to claim 9, characterized in that, The air supply mechanism (8) includes a pump body (81) disposed in the vehicle body (1) and an air guide pipe (82) connecting the pump body (81) and the airbag (7). The air guide pipe (82) includes a first conduit (821) connected to the pump body (81), a second conduit (822) connecting the first conduit (821) and the first airbag (7), and a third conduit (823) connecting the first conduit (821) and the second airbag (7).

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