Line erecting mechanism and multifunctional emergency flood drainage device

By optimizing the structural design of the emergency drainage device and adopting components such as snap-fit ​​blocks, connectors, and waterproof parts, the problems of large size and heavy weight of traditional equipment have been solved, enabling rapid deployment and stable use in complex environments, and improving the flexibility and waterproof performance of the equipment.

CN223599357UActive Publication Date: 2025-11-25GUIZHOU POWER GRID CO LTD
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Patent Information

Application Number
CN202422916993.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-11-25
Estimated Expiration
2034-11-28

AI Technical Summary

Technical Problem

Traditional emergency drainage equipment is large and heavy, takes a long time to assemble, has high operating costs, is limited in its scope of use, and its lines are easily corroded by rainwater.

Method used

A multifunctional emergency drainage device was designed, including a mounting unit, a drainage unit, a telescopic unit, and a support unit. It adopts components such as snap-fit ​​blocks, connectors, waterproof parts, and lighting to optimize the internal space layout, improve the flexibility and stability of the connection, and has waterproof performance and lighting function.

Benefits of technology

The device achieves stability and reliability, is suitable for various emergency drainage scenarios, can be deployed quickly, adapts to complex environments, and has improved service life and operational safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a line erecting mechanism and a multifunctional emergency flood drainage device, and relates to the technical field of emergency flood drainage operation, the line erecting mechanism comprises an erecting unit which comprises a fixing block, an erecting block, two groups of clamping blocks, a connecting piece, a fixing plate and a waterproof piece; the erecting block is hollow, and one side of the erecting block is in an inclined plane shape. The clamping blocks are fixedly connected to the two ends of the fixing block. The device has the beneficial effects that the stability and the reliability of the device are ensured, and the device is suitable for various emergency drainage and line erection scenes. By optimizing the internal space layout, the flexibility and the stability of connection are improved, the device has good waterproof performance and a lighting function, and the device is excellent in performance in practical application and can effectively meet the emergency drainage requirements in various complex environments.
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Description

Technical Field

[0001] This utility model relates to the field of emergency drainage operation technology, and in particular to a line erection mechanism and a multi-functional emergency drainage device. Background Technology

[0002] Traditional emergency drainage equipment typically suffers from the following problems: It often consists of multiple independent components, such as engines, pumps, and pipes, which need to be assembled on-site, increasing preparation time and labor intensity. Due to its large size and weight, traditional drainage equipment requires heavy machinery such as forklifts or cranes for transport, increasing operating costs and limiting rapid deployment in emergencies. Some drainage equipment designs fail to adequately consider the needs of different environments, such as urban roads, industrial areas, and the special conditions of the wilderness, thus limiting its application range. Furthermore, the installed power lines are susceptible to rainwater erosion, affecting their usability. Utility Model Content

[0003] In view of the problems existing in the above or prior art, this utility model is proposed.

[0004] Therefore, the purpose of this utility model is to provide a multifunctional emergency drainage device that can solve the problems of the wiring of emergency drainage devices being easily eroded by rainwater, as well as the inconvenience of using emergency drainage devices.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a multi-functional emergency drainage device, which includes a mounting unit, including a fixing block, a mounting block disposed on one side of the fixing block, two sets of snap-fit ​​blocks disposed on both sides of the mounting block, a connector disposed on one side of the mounting block, a fixing plate disposed on one side of the connector, and a waterproof component disposed on the inner side of the fixing plate;

[0006] The mounting block is hollow inside and has a sloping side on one side;

[0007] The snap-fit ​​block is fixedly connected to both ends of the fixing block.

[0008] As a preferred embodiment of the line erection mechanism of this utility model, the snap-fit ​​block includes a connecting part and a snap-fit ​​part protruding from one side of the connecting part;

[0009] A light is provided at the end of the fixing plate.

[0010] In a preferred embodiment of the line erection mechanism of this utility model, the snap-fit ​​block is U-shaped and its bottom is connected to the fixing block;

[0011] The snap-fit ​​portion includes multiple sets of oblique slots on its two end faces, and a transverse slot disposed inside the oblique slots.

[0012] As a preferred embodiment of the line erection mechanism of this utility model, the connecting member includes a snap-fit ​​seat disposed on the outside of the snap-fit ​​part, and a connecting rod disposed on one side of the snap-fit ​​seat.

[0013] As a preferred embodiment of the line erection mechanism of this utility model, the waterproof component includes a clamping cylinder, a wire placement sleeve disposed inside the clamping cylinder, and a locking sleeve disposed on one side of the wire placement sleeve.

[0014] As a preferred embodiment of the line erection mechanism of this utility model, the snap-fit ​​cylinder includes a threaded ring disposed on its outer side and a petal post disposed on one side of the threaded ring.

[0015] As a preferred embodiment of the line erection mechanism of this utility model, a wire hole is provided through the wire placement sleeve;

[0016] The locking sleeve engages with the threaded ring.

[0017] To solve the above-mentioned technical problems, this utility model also provides the following technical solution: a multi-functional emergency drainage device, including a drainage unit, including a frame, a pump body disposed inside the frame, and a drainage outlet disposed on one side of the pump body;

[0018] The telescopic unit includes a telescopic cylinder disposed on the top of the frame and a connecting frame disposed on the top of the telescopic cylinder;

[0019] The support unit includes lifting components disposed on both sides of the frame and a movable component disposed at the bottom of the frame.

[0020] As a preferred embodiment of the multifunctional emergency drainage device of this utility model, the lifting member includes a clamping plate, a lever arm disposed on the outside of the clamping plate, and a supporting leg disposed on one side of the lever arm.

[0021] As a preferred embodiment of the multifunctional emergency drainage device of this utility model, the mobile component includes a vehicle body disposed at the bottom of the frame and mobile wheels disposed at the bottom of the vehicle body.

[0022] The beneficial effects of this invention are: it ensures the stability and reliability of the device, making it suitable for various emergency drainage and power line construction scenarios. By optimizing the internal space layout, improving the flexibility and stability of connections, and possessing excellent waterproof performance and lighting functions, this device performs outstandingly in practical applications and can effectively meet the emergency drainage needs in various complex environments. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the line erection mechanism of this utility model.

[0025] Figure 2 This is an exploded view of the structural connection relationship of the line erection mechanism of this utility model.

[0026] Figure 3 This is a schematic diagram of the waterproof component in the line erection mechanism of this utility model.

[0027] Figure 4 This is a schematic diagram of the structure of the multifunctional emergency drainage device of this utility model.

[0028] Figure 5 This is a schematic diagram of the multifunctional emergency drainage device of this utility model in its open state. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0032] Example 1

[0033] Reference Figure 1This is the first embodiment of the present utility model. This embodiment provides a line erection mechanism, including an erection unit 100, including a fixing block 101, an erection block 102 disposed on one side of the fixing block 101, two sets of snap-fit ​​blocks 103 disposed on both sides of the erection block 102, a connector 104 disposed on one side of the erection block 102, a fixing plate 105 disposed on one side of the connector 104, and a waterproof component 106 disposed inside the fixing plate 105.

[0034] The support block 102 is hollow inside and has a sloping side on one side;

[0035] The snap-fit ​​block 103 is fixedly connected to both ends of the fixing block 101.

[0036] The fixing block 101 is hollow inside, with one side sloped to optimize the internal space layout. The mounting block 102 is located on one side of the fixing block 101, also hollow inside, with one side vertical and the other sloped, to fit snugly against the two latching blocks 103 on either side, allowing for angle adjustment. The latching blocks 103 are located on both sides of the mounting block 102, with each set of latching blocks 103 fixedly connected to both ends of the fixing block 101 for quick connection to external equipment or structures. The connector 104 is located on one side of the mounting block 102, fixing the two sets of latching blocks 103 and the middle mounting block 102 together. The fixing plate 105 is located on one side of the connector 104, with a through hole at its axis for wiring passage. The waterproof component 106 is located inside the fixing plate 105, with an interface for wiring connection to external equipment, ensuring complete waterproofing of the wiring.

[0037] Preferably, the fixing block 101 is hollow inside, with one side being beveled, and is connected to the device by fixed welding to ensure structural stability. The mounting block 102 is hollow inside, with one side being vertical and the other side being beveled, and is connected to the fixing block 101 by slot snap-fit, facilitating disassembly and assembly. Each set of snap-fit ​​blocks 103 is fixedly connected to both ends of the fixing block 101, and the axis of the snap-fit ​​block 103 has a through groove, facilitating the laying and leading out of the wiring from inside the mounting block 102. The connector 104 is provided on one side of the mounting block 102, and the two sets of snap-fit ​​blocks 103 and the middle mounting block 102 are fixedly connected together by the connector 104 to ensure structural stability. The fixing plate 105 is provided on one side of the connector 104, and the axis of the fixing plate 105 has a through hole for the passage of wiring. The waterproof component 106 is located inside the fixing plate 105. The waterproof component 106 has an interface for connecting the wiring to external devices, ensuring that the wiring is completely waterproof.

[0038] In summary, this device connects the mounting block 102 and the fixing block 101 via a slotted snap-fit ​​mechanism, facilitating disassembly and assembly and improving maintenance and ease of use. One side of the mounting block 102 is designed with a slope, fitting snugly against the snap-fit ​​blocks 103 on both sides, allowing for angle adjustment to adapt to different installation environments. This enhances the device's service life and reliability in humid or outdoor environments. This line erection mechanism is suitable for various scenarios, such as urban road flooding, industrial waterlogging, and field drainage, and has broad application prospects.

[0039] Example 2

[0040] Reference Figures 1-3 This is the second embodiment of the present utility model, which differs from the first embodiment in that it also includes a mounting unit 100, including a fixing block 101, a mounting block 102 disposed on one side of the fixing block 101, two sets of snap-fit ​​blocks 103 disposed on both sides of the mounting block 102, a connector 104 disposed on one side of the mounting block 102, a fixing plate 105 disposed on one side of the connector 104, and a waterproof component 106 disposed inside the fixing plate 105;

[0041] The support block 102 is hollow inside and has a sloping side on one side;

[0042] The snap-fit ​​block 103 is fixedly connected to both ends of the fixing block 101.

[0043] Furthermore, the snap-fit ​​block 103 includes a connecting portion 103a and a snap-fit ​​portion 103b protruding from one side of the connecting portion 103a;

[0044] A light 200 is provided at the end of the fixing plate 105.

[0045] Furthermore, the snap-fit ​​block 103 is U-shaped, and its bottom is connected to the fixing block 101;

[0046] The snap-fit ​​portion 103b includes multiple sets of oblique slots 103b-1 provided on its two end faces, and a transverse slot 103b-2 provided inside the oblique slots 103b-1.

[0047] Furthermore, the connector 104 includes a snap-fit ​​seat 104a disposed on the outside of the snap-fit ​​portion 103b, and a connecting rod 104b disposed on one side of the snap-fit ​​seat 104a.

[0048] Furthermore, the waterproof component 106 includes a snap-fit ​​sleeve 106a, a wire-holding sleeve 106b disposed inside the snap-fit ​​sleeve 106a, and a locking sleeve 106c disposed on one side of the wire-holding sleeve 106b.

[0049] Furthermore, the snap-fit ​​cylinder 106a includes a threaded ring 106a-1 disposed on its outer side, and a flap 106a-2 disposed on one side of the threaded ring 106a-1.

[0050] Furthermore, a wire hole 106b-1 is provided through the wire sleeve 106b;

[0051] The locking sleeve 106c mates with the threaded ring 106a-1.

[0052] It should be noted that the fixing block 101 is hollow inside, with one side sloping, to optimize the internal space layout, reduce wind resistance, and improve the stability of the device in outdoor environments. The fixing block 101 is connected to the device by fixed welding to ensure structural stability. The mounting block 102 is located on one side of the fixing block 101, and is hollow inside, with one side being vertical and the other side sloping, so as to fit with the snap-fit ​​blocks 103 on both sides to achieve angle adjustment. The mounting block 102 is connected to the fixing block 101 by slot snap-fit, which is convenient for disassembly and assembly. The snap-fit ​​blocks 103 are located on both sides of the mounting block 102, and each set of snap-fit ​​blocks 103 is fixedly connected to both ends of the fixing block 101 for quick connection with external equipment or structures. The snap-fit ​​blocks 103 are U-shaped, and their bottoms are connected to the fixing block 101. The two end faces of the snap-fit ​​block 103 are provided with oblique slots 103b-1, and the inner side of the oblique slots 103b-1 is provided with transverse slots 103b-2. This design not only ensures the stability of the connection, but also adapts to the connection requirements of different sizes. Figure 2 As shown, the design of the oblique slot 103b-1 and the horizontal slot 103b-2 improves the flexibility of the connection. A connector 104 is disposed on one side of the mounting block 102, and the two sets of snap-fit ​​blocks 103 and the intermediate mounting block 102 are fixedly connected together via the connector 104. The connector 104 includes a snap-fit ​​seat 104a and a connecting rod 104b. The snap-fit ​​seat 104a is disposed on the outside of the snap-fit ​​block 103, and the connecting rod 104b extends from the snap-fit ​​seat 104a. A fixing plate 105 is disposed on one side of the connector 104, and a lighting lamp 200 is disposed at the end of the fixing plate 105. A through hole is formed in the axial center of the fixing plate 105 for the passage of wiring. Figure 1 As shown, the through-hole design on the fixing plate 105 facilitates the layout of the circuit.

[0053] A lighting lamp 200 is provided at the end of the fixing plate 105. The lighting lamp 200 is connected to the power supply through internal wiring to ensure the realization of the lighting function.

[0054] A waterproof component 106 is located inside the fixing plate 105 to protect the internal wiring from external environmental influences. The waterproof component 106 includes a snap-fit ​​cylinder 106a, a wire-holding sleeve 106b, and a locking sleeve 106c. The snap-fit ​​cylinder 106a has a threaded ring 106a-1 on its outer side, and a flap 106a-2 on one side of the threaded ring 106a-1. The wire-holding sleeve 106b is located inside the snap-fit ​​cylinder 106a, and a wire hole 106b-1 is provided through the sleeve to accommodate and protect the internal wiring. The locking sleeve 106c is located on one side of the wire-holding sleeve 106b and cooperates with the threaded ring 106a-1 to fix the sleeve 106b and prevent the wiring from loosening. Figure 3 As shown, the design of the locking sleeve 106c ensures the sealing of the waterproof component 106.

[0055] Fix the fixing block 101 to the ground or other supporting structure using screws or bolts through the fixing holes. Secure the mounting block 102 to one side of the fixing block 101 using a slotted snap-fit ​​connection. The beveled design of the mounting block 102 better adapts to different installation environments. Figure 1 As shown, the beveled design of the mounting block 102 better adapts to different installation environments. The snap-fit ​​block 103 is fixedly connected to both ends of the fixing block 101, ensuring that the U-shaped design of the snap-fit ​​block 103 can be quickly connected to external equipment or structures. The two end faces of the snap-fit ​​block 103 are provided with beveled slots 103b-1, and the inner side of the beveled slots 103b-1 is provided with transverse slots 103b-2. The snap-fit ​​seat 104a of the connector 104 is fixed to the outside of the snap-fit ​​block 103, and the connecting rod 104b extends from the snap-fit ​​seat 104a. The design of the connector 104 ensures the stability of the structure. Figure 2 As shown, the fixing plate 105 is fixed to one side of the connector 104 using screws or bolts through the mounting holes. The through-hole design on the fixing plate 105 facilitates wiring. The lighting lamp 200 is fixed to the end of the fixing plate 105 and connected to the power supply via internal wiring. The design of the lighting lamp 200 improves operational safety at night or in low-light conditions. The snap-fit ​​sleeve 106a of the waterproof component 106 is screwed into the inside of the fixing plate 105, ensuring that the threaded ring 106a-1 of the snap-fit ​​sleeve 106a matches the threaded hole of the fixing plate 105. The waterproof component 106 is securely fixed to the fixing plate 105 by rotating the snap-fit ​​sleeve 106a. The wire holder 106b is located inside the snap-fit ​​sleeve 106a, and a wire hole 106b-1 is provided through the wire holder 106b to accommodate and protect the internal wiring. The locking sleeve 106c is located on one side of the wire-holding sleeve 106b and cooperates with the threaded ring 106a-1 to fix the wire-holding sleeve 106b and prevent the wire from becoming loose.

[0056] In summary, this embodiment ensures the stability and reliability of the device, making it suitable for various emergency drainage and power line erection scenarios. By optimizing the internal space layout, improving the flexibility and stability of connections, and possessing excellent waterproof performance and lighting functions, this erection mechanism performs outstandingly in practical applications and can effectively meet the emergency drainage needs in various complex environments.

[0057] Example 3

[0058] Reference Figures 4-5 This is the third embodiment of the present utility model, which differs from the previous two embodiments in that it also provides a multi-functional emergency drainage device, including a drainage unit 300, including a frame 301, a pump body 302 disposed inside the frame 301, and a drain outlet 303 disposed on one side of the pump body 302.

[0059] The telescopic unit 400 includes a telescopic cylinder 401 disposed on the top of the frame 301, and a connecting frame 402 disposed on the top of the telescopic cylinder 401;

[0060] The support unit 500 includes lifting members 501 disposed on both sides of the frame 301 and a moving component 502 disposed at the bottom of the frame 301.

[0061] Furthermore, the lifting member 501 includes a clamping plate 501a, a lever arm 501b disposed on the outside of the clamping plate 501a, and a support leg 501c disposed on one side of the lever arm 501b.

[0062] Furthermore, the mobile component 502 includes a vehicle body 502a disposed at the bottom of the frame 301, and a mobile wheel 502b disposed at the bottom of the vehicle body 502a.

[0063] It should be noted that frame 301 is the basic framework of the entire device, used to support and secure other components. For example... Figure 4 As shown, the design of the frame 301 ensures the overall structural stability of the device. The pump body 302 is located inside the frame 301 and is used to pump out accumulated water. Figure 4 As shown, the pump body 302 is positioned at the center of the frame 301 for easy maintenance and repair. The drain outlet 303 is located on one side of the pump body 302 to drain the pumped-out water. Figure 4 As shown, the location of the drain outlet 303 is designed for easy connection of a drainage pipe. The telescopic cylinder 401 is installed at the top of the frame 301 and is used to adjust the height of the erection unit 100. The telescopic cylinder 401 adopts a multi-stage telescopic design, and its height can be adjusted manually or electrically to adapt to different working environments. Figure 4As shown, the design of the telescopic cylinder 401 improves the flexibility of the device. A connecting frame 402 is located on top of the telescopic cylinder 401 for connecting other components or equipment. The connecting frame 402 is made of high-strength aluminum alloy, providing good stability and corrosion resistance. Figure 4 As shown, the design of the connecting frame 402 facilitates the connection of other equipment. Lifting components 501 are located on both sides of the frame 301 and are used to lift the device when needed. The lifting component 501 includes a clamping plate 501a, a lever arm 501b located outside the clamping plate 501a, and a support leg 501c located on one side of the lever arm 501b. The clamping plate 501a is fixed to both sides of the frame 301 and supports the lever arm 501b. The lever arm 501b is located outside the clamping plate 501a and transmits lifting force. The support leg 501c is located on one side of the lever arm 501b and is used to lift the device when needed. The support leg 501c has an adjustable design, allowing its height to be adjusted according to the terrain to ensure the stability of the device. A moving assembly 502 is located at the bottom of the frame 301 and is used to move the device. The moving assembly 502 includes a vehicle body 502a and moving wheels 502b located at the bottom of the vehicle body 502a. The vehicle body 502a is fixed to the bottom of the frame 301 to support the moving wheels 502b. The moving wheels 502b are located at the bottom of the vehicle body 502a and are used to move the device. The moving wheels 502b have a large diameter design, providing good maneuverability and stability.

[0064] In summary, this device ensures stability and reliability, making it suitable for various emergency drainage and power line installation scenarios. Through optimized internal space layout, improved connection flexibility and stability, and excellent waterproofing and lighting capabilities, this device performs outstandingly in practical applications, effectively addressing emergency drainage needs in diverse and complex environments.

[0065] Importantly, the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A line erection mechanism, characterized in that: The device includes a mounting unit (100), comprising a fixing block (101), a mounting block (102) disposed on one side of the fixing block (101), two sets of snap-fit ​​blocks (103) disposed on both sides of the mounting block (102), a connector (104) disposed on one side of the mounting block (102), a fixing plate (105) disposed on one side of the connector (104), and a waterproof component (106) disposed inside the fixing plate (105). The mounting block (102) is hollow inside and has one side sloping. The snap-fit ​​block (103) is fixedly connected to both ends of the fixing block (101).

2. The line erection mechanism as described in claim 1, characterized in that: The snap-fit ​​block (103) includes a connecting part (103a) and a snap-fit ​​part (103b) protruding from one side of the connecting part (103a). A lighting lamp (200) is provided at the end of the fixing plate (105).

3. The line erection mechanism as described in claim 2, characterized in that: The snap-fit ​​block (103) is U-shaped and its bottom is connected to the fixing block (101); The snap-fit ​​portion (103b) includes multiple sets of oblique slots (103b-1) on its two end faces, and a transverse slot (103b-2) disposed inside the oblique slots (103b-1).

4. The line erection mechanism as described in claim 3, characterized in that: The connector (104) includes a snap-fit ​​seat (104a) disposed on the outside of the snap-fit ​​portion (103b) and a connecting rod (104b) disposed on one side of the snap-fit ​​seat (104a).

5. The line erection mechanism as described in claim 4, characterized in that: The waterproof component (106) includes a snap-fit ​​sleeve (106a), a wire-holding sleeve (106b) disposed inside the snap-fit ​​sleeve (106a), and a locking sleeve (106c) disposed on one side of the wire-holding sleeve (106b).

6. The line erection mechanism as described in claim 5, characterized in that: The snap-fit ​​cylinder (106a) includes a threaded ring (106a-1) disposed on its outer side, and a petal (106a-2) disposed on one side of the threaded ring (106a-1).

7. The line erection mechanism as described in claim 6, characterized in that: A wire hole (106b-1) is provided through the wire sleeve (106b). The locking sleeve (106c) is engaged with the threaded ring (106a-1).

8. A multifunctional emergency drainage device, characterized in that: The system includes the line erection mechanism according to any one of claims 1 to 7, and also includes a drainage unit (300), which includes a frame (301), a pump body (302) disposed inside the frame body (301), and a drain outlet (303) disposed on one side of the pump body (302). The telescopic unit (400) includes a telescopic cylinder (401) disposed on the top of the frame (301) and a connecting frame (402) disposed on the top of the telescopic cylinder (401). The support unit (500) includes lifting members (501) disposed on both sides of the frame (301) and a moving component (502) disposed at the bottom of the frame (301).

9. The multifunctional emergency drainage device as described in claim 8, characterized in that: The lifting member (501) includes a clamping plate (501a), a lever arm (501b) disposed on the outside of the clamping plate (501a), and a support leg (501c) disposed on one side of the lever arm (501b).

10. The multifunctional emergency drainage device as described in claim 9, characterized in that: The mobile component (502) includes a vehicle body (502a) disposed at the bottom of the frame (301) and a moving wheel (502b) disposed at the bottom of the vehicle body (502a).