Safety anti-collision mechanism of electric flat car

Abstract

The utility model relates to electric flat car technical field provides a kind of electric flat car safety anticollision mechanism, including frame, this electric flat car safety anticollision mechanism further includes: inflatable air bag, annular sleeve is located at the outside of the frame, the height of the inflatable air bag is identical with frame;In the utility model, by setting inflatable air bag annularly wrapping frame, high-strength material has protection and flexibility, can buffer collision impact force in all directions, avoid frame and goods damage, buffering component is matched with the clamping of high-pressure gas pipe and connecting shaft, realize air bag stable inflation and deflation, pressure sensor real-time monitoring air pressure, controller accurate regulation and control inflation pump and exhaust valve, ensure that air bag is always in effective protection state, double relief design further improves the reliability of protection, prevent overpressure risk, both enhance the electric flat car operation safety, and simplify assembly and maintenance process, adapt to the actual use demand of industrial scene.

Description

Technical Field

[0001] This utility model relates to the field of electric flatbed cart technology, and in particular to a safety anti-collision mechanism for electric flatbed carts. Background Technology

[0002] Electric flatbed carts, as core equipment for material handling in the industrial sector, are widely used in workshops, warehouses, ports, and other scenarios. Their operational safety is directly related to the safety of personnel and property. With the development of intelligent manufacturing, the operating frequency and load of electric flatbed carts have increased, and they are often in environments where multiple devices are operating simultaneously, significantly increasing the risk of collisions. This has led to frequent accidents such as equipment damage and material tipping, creating an urgent need for reliable anti-collision mechanisms.

[0003] In existing technology, such as Chinese Patent No. CN222512205U, a safety anti-collision mechanism for electric flatbed carts includes a frame, a braking mechanism, and a shock absorption mechanism. The frame has evenly distributed wheels on both the left and right sides at its lower end, and protective covers are fixedly connected to both the front and rear ends of the frame. The braking mechanism is located between the front and rear sides of the frame and the interior of the protective covers. The shock absorption mechanism is located on the left and right sides of the frame. The device also includes a microcontroller fixedly connected to the right front end of the frame, with its input electrically connected to an external power source. Furthermore, it includes an infrared rangefinder fixedly connected to the left and right ends of the upper surface of the frame. This electric flatbed cart safety anti-collision mechanism achieves anti-collision, has a large detection range, and is unaffected by environmental or external factors, meeting the requirements for wide-range and accurate anti-collision of the flatbed cart, reducing losses caused by collisions, and providing sufficient safety distance.

[0004] While the above-mentioned solutions have the advantages mentioned above, their disadvantages are as follows: the device relies on the expansion and contraction of the damper and the deformation of the spring to achieve passive energy absorption. The energy absorption method is singular and the energy absorption density is limited. The damper can only consume part of the impact force through oil friction, and the spring is prone to transmitting the impact force back to the frame due to excessive rigidity. The original structure cannot effectively cover the corners of the frame and the extra-wide areas of the cargo. When the collision occurs in the blind spot, it is easy to cause damage to the cargo or local dents in the frame. On the other hand, the original structure is mostly fixed and cannot be adapted to cargo of different widths and heights. When facing non-standard sized cargo transportation scenarios, the protection adaptability is extremely poor. Utility Model Content

[0005] The purpose of this invention is to solve the problems in the prior art where the device relies on the extension and contraction of the damper and the deformation of the spring to achieve passive energy absorption. The energy absorption method is singular and the energy absorption density is limited. The damper can only consume part of the impact force through oil friction, and the spring is prone to the impact force being transmitted back to the frame due to excessive rigidity.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an electric flatbed car safety anti-collision mechanism: including a frame, the electric flatbed car safety anti-collision mechanism further includes:

[0007] An inflatable airbag is annularly fitted around the outside of the vehicle frame. The height of the inflatable airbag is the same as that of the vehicle frame. The inflatable airbag is made of high-strength nylon fiber.

[0008] Multiple grooves are provided in two groups on the top of the vehicle frame;

[0009] Multiple sliders are slidably installed inside multiple grooves, the multiple grooves and sliders are diagonally distributed, and the multiple sliders are L-shaped;

[0010] A cushioning component is disposed on the inflatable airbag;

[0011] Multiple snap-fit ​​components are disposed at the bottom of the multiple sliders.

[0012] In a preferred embodiment, the buffer component includes:

[0013] An air pump is located on one side of the bottom of the frame;

[0014] A connecting shaft is installed on one side of the bottom of the inflatable airbag;

[0015] A high-pressure air hose is installed on one side of the air pump. One end of the high-pressure air hose is engaged with a connecting shaft, and the high-pressure air hose is connected to the inside of the inflatable airbag through the connecting shaft.

[0016] The technical effect of adopting the above-mentioned further solution is to achieve stable connection between the air pump and the airbag, smooth gas delivery without leakage, and reliable airbag inflation and deflation.

[0017] In a preferred embodiment, the buffer component further includes:

[0018] An electromagnetic exhaust valve is installed on one side of the top of the inflatable airbag;

[0019] The controller is fixedly installed on one side of the vehicle frame;

[0020] A pressure sensor is installed on one side of the inner cavity of the inflatable airbag, and the pressure sensor is electrically connected to the electromagnetic exhaust valve through a PLC controller.

[0021] The technical effects of adopting the above-mentioned further solutions are: real-time monitoring of airbag pressure, precise control of the exhaust valve by the controller, ensuring stable protection status, and improving the timeliness of collision avoidance response.

[0022] In a preferred embodiment, the snap-fit ​​assembly includes:

[0023] A fixing block is fixedly installed at the bottom of the slider;

[0024] A circular plate is fixedly installed at the bottom of the fixing block;

[0025] An installation groove is formed at the bottom of the slide groove, and the installation groove is connected to the slide groove;

[0026] Mounting plate, installed at the bottom of the mounting slot;

[0027] Two semi-circular plates are hinged to the top of the mounting plate, and the circular plate is adapted to fit between the two semi-circular plates.

[0028] The technical effect of adopting the above-mentioned further solution is that the slider positioning is achieved through component adaptation, providing stable support for the airbag and ensuring the integrity of the protective structure.

[0029] In a preferred embodiment, the snap-fit ​​assembly further includes:

[0030] Two connecting blocks are respectively installed on one side of the two semi-arc plates;

[0031] Two elastic elements are disposed between the mounting plate and the two connecting blocks. The bottom ends of the two elastic elements are connected to the top of the mounting plate, and the top ends of the two elastic elements are respectively connected to the bottom of the two connecting blocks.

[0032] The technical effect of adopting the above-mentioned further solution is that the elastic element drives the semi-arc plate to automatically clamp, which enhances the positioning stability and facilitates the disassembly and assembly of the slider.

[0033] As a preferred embodiment, the electric flatbed vehicle safety collision avoidance mechanism further includes:

[0034] Multiple handles are fixedly installed on the top of the slider.

[0035] The technical advantages of adopting the above-mentioned further solutions are: it facilitates manual operation of the slider, simplifies the airbag disassembly and assembly process, and improves maintenance convenience.

[0036] As a preferred embodiment, the electric flatbed vehicle safety collision avoidance mechanism further includes:

[0037] Multiple pressure-triggered switches are installed on one side of the outside of the inflatable airbag, and the pressure-triggered switches are linked to the electromagnetic exhaust valve.

[0038] The technical effect of adopting the above-mentioned further solution is to form a mechanical trigger protection, which, together with electronic monitoring, achieves dual protection and avoids failure due to a single trigger.

[0039] As a preferred embodiment, the electric flatbed vehicle safety collision avoidance mechanism further includes:

[0040] A mounting ring is installed on one side of the bottom of the frame, and the mounting ring encloses the air pump in a ring.

[0041] The technical effects of adopting the above-mentioned further solutions are: to fix and protect the air pump, to isolate it from external interference and collisions, to protect the core components, and to extend its service life.

[0042] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0043] 1. This utility model, by setting up an inflatable airbag to wrap around the frame, uses high-strength materials that combine protection and flexibility to buffer collision impacts in all directions, preventing damage to the frame and cargo. The buffer component achieves stable inflation and deflation of the airbag through the snap-fit ​​of the high-pressure air pipe and the connecting shaft. The pressure sensor monitors the air pressure in real time, and the controller precisely controls the inflation pump and the deflation valve to ensure that the airbag is always in an effective protective state. The dual pressure relief design further improves the reliability of protection and prevents the risk of overpressure. It not only enhances the safety of electric flatbed vehicle operation, but also simplifies the assembly and maintenance process, and is suitable for the actual use needs of industrial scenarios.

[0044] 2. This utility model, through the matching and cooperation of the semi-arc plate and the circular plate by the snap-fit ​​component, achieves rapid positioning of the slider with the help of the elastic force of the elastic element, which stably supports the inflatable airbag and ensures the integrity of the protective structure. The handle design facilitates manual operation of the slider, making the airbag installation and removal more convenient and improving maintenance efficiency. The pressure trigger switch and the electromagnetic exhaust valve are linked to form a mechanical trigger protection, which, together with electronic monitoring, achieves double protection to avoid failure due to a single trigger. The mounting ring forms a ring around the air pump, which can not only fix the position of the air pump, but also isolate external collisions and impurities, protecting the core components. Attached Figure Description

[0045] Figure 1 This is a perspective view of an embodiment of this application;

[0046] Figure 2 This is a perspective cross-sectional view of the vehicle frame according to an embodiment of this application;

[0047] Figure 3 This is an embodiment of the present application. Figure 2 Enlarged view of point A;

[0048] Figure 4 This is a three-dimensional cross-sectional view of the inflatable airbag in an embodiment of this application.

[0049] Legend:

[0050] 1. Frame; 2. Inflatable airbag; 3. Slider; 4. Electromagnetic exhaust valve; 5. Handle; 6. Controller; 7. Slide rail; 8. Inflation pump; 9. High-pressure air hose; 10. Mounting ring; 11. Mounting groove; 12. Connecting block; 13. Mounting plate; 14. Semi-arc plate; 15. Elastic element; 16. Pressure trigger switch; 17. Circular plate; 18. Pressure sensor; 19. Fixing block; 20. Connecting shaft. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0052] Example:

[0053] Please see Figures 1-4 This embodiment provides a safety anti-collision mechanism for electric flatbed carts, the specific idea of ​​which is as follows:

[0054] An electric flatbed vehicle safety anti-collision mechanism includes a frame 1, and the electric flatbed vehicle safety anti-collision mechanism also includes: an inflatable airbag 2, multiple sliding grooves 7, multiple sliders 3, a buffer assembly, multiple snap-fit ​​assemblies, multiple handles 5, multiple pressure trigger switches 16, and a mounting ring 10.

[0055] The frame 1 is fitted with an annular inflatable airbag 2, which is made of high-strength nylon fiber material and is integrally molded. Its axial height is consistent with the height of the frame 1, which can form a full-wrap protection around the frame 1.

[0056] In addition, two sets of slide grooves 7 are symmetrically opened on the top of the frame 1 along the length direction. The two sets of slide grooves 7 are diagonally symmetrically distributed, and each slide groove 7 is equipped with an L-shaped slider 3.

[0057] The L-shaped slider 3 has a handle 5 fixedly connected to its top for easy manual operation, and a corresponding snap-fit ​​component is fitted to its bottom for positioning the slider 3. The snap-fit ​​component can stably limit the slider 3 to the slide groove 7, while also ensuring easy disassembly and assembly.

[0058] In addition, a mounting ring 10 is fixedly installed on one side of the bottom of the frame 1. The mounting ring 10 has a ring structure and an air pump 8 is embedded and fixed inside it. The mounting ring 10 is used to protect and position the air pump 8.

[0059] Among them, a controller 6 is also fixedly installed on one side of the frame 1, which serves as the control core of the entire anti-collision mechanism, coordinating and connecting various functional components to achieve collaborative work.

[0060] In addition, a cushioning component is provided on the inflatable airbag 2.

[0061] As examples, in this embodiment, the buffer assembly includes: an air pump 8, a connecting shaft 20, a high-pressure air pipe 9, an electromagnetic exhaust valve 4, a controller 6, and a pressure sensor 18.

[0062] Among them, the buffer assembly is the core functional module of the anti-collision mechanism, and its components are connected to the circuit through mechanical connections to form a closed-loop control system.

[0063] In addition, the output end of the air pump 8 is sealed with a high-pressure air pipe 9. The end of the high-pressure air pipe 9 away from the air pump 8 is detachably connected to the connecting shaft 20 installed on the bottom side of the airbag 2 by a snap-fit ​​method. The high-pressure air pipe 9 is connected to the inner cavity of the airbag 2 through the internal channel of the connecting shaft 20, so as to realize the gas delivery from the air pump 8 to the airbag.

[0064] In addition, an electromagnetic exhaust valve 4 is installed through one side of the top of the inflatable airbag 2.

[0065] A pressure sensor 18 is fixedly installed on one side of the inner cavity of the inflatable airbag 2. The pressure sensor 18 and the electromagnetic exhaust valve 4 are both connected to the controller 6 through a circuit.

[0066] Specifically, the pressure sensor 18 is connected to the analog signal input terminal of the controller 6 via a signal line to collect the internal pressure data of the airbag in real time and feed it back to the controller 6. The electromagnetic exhaust valve 4 and the air pump 8 are connected in parallel to the power output terminal of the controller 6, and the controller 6 controls their on / off and start / stop. At the same time, multiple pressure trigger switches 16 are also installed on the outside of the airbag 2. The pressure trigger switches 16 and the electromagnetic exhaust valve 4 form a mechanical linkage, which constitutes a double trigger protection.

[0067] It should be noted that all electrical components are powered by the on-board power supply of the electric flatbed cart. The controller 6 is connected in series in the power supply circuit to provide a stable and compatible working voltage for components such as the pressure sensor 18, the air pump 8, and the electromagnetic exhaust valve 4, ensuring that all components operate in coordination.

[0068] As examples, in this embodiment, the snap-fit ​​component includes: a fixing block 19, a circular plate 17, a mounting groove 11, a mounting plate 13, two semi-circular plates 14, two connecting blocks 12, and two elastic members 15.

[0069] The snap-fit ​​components are set at the bottom of each slider 3, and together with the slide groove 7 and mounting groove 11 on the top of the frame 1, they form a positioning structure.

[0070] In addition, the bottom of the slide 7 is provided with an installation groove 11 that is connected to the slide 7. An installation plate 13 is fixedly mounted at the bottom of the installation groove 11. Two opposing semi-arc plates 14 are hinged to the top of the installation plate 13. The two semi-arc plates 14 enclose and form a clamping space that is compatible with the bottom fixing block 19 of the slider 3. The circular plate 17 fixedly connected to the bottom of the fixing block 19 fits snugly with the inner arc surface of the semi-arc plate 14, thereby improving the clamping stability.

[0071] In addition, connecting blocks 12 are fixedly connected to the opposite sides of the two semi-circular plates 14. An elastic element 15 is assembled between the bottom of the connecting block 12 and the top of the mounting plate 13. The two ends of the elastic element 15 are fixedly connected to the bottom of the connecting block 12 and the top of the mounting plate 13, respectively. Through the elastic force of the elastic element 15, the two semi-circular plates 14 are pushed to always maintain the opposite clamping state, so as to realize the automatic clamping and positioning of the fixed block 19.

[0072] It should be noted that when it is necessary to disassemble slider 3, slider 3 is pulled upward by handle 5, circular plate 17 squeezes semi-arc plate 14 to open around the hinge point, elastic element 15 is compressed, and slider 3 can be taken out from slide groove 7.

[0073] In this embodiment, the frame 1 is the base, the annular inflatable airbag 2 surrounds its periphery to form protection, the slider 3 is positioned in the slide groove 7 by the snap-fit ​​assembly, the semi-arc plate 14 is driven by the elastic element 15 to adapt to the circular plate 17, and the airbag is stably supported. The vehicle power supply provides power, the controller 6 coordinates the operation of each component, the pressure sensor 18 monitors the airbag pressure in real time and feeds back the signal to the controller 6 to regulate the inflation pump 8 to inflate and deflate, and maintain the effective protective state of the airbag.

[0074] Working principle:

[0075] In use, the operator slides the L-shaped slider 3 along the diagonally distributed grooves 7 on the top of the frame 1 to the preset position using the handle 5 on the top of the slider 3. The fixing block 19 at the bottom of the slider 3 drives the circular plate 17 to extend into the mounting groove 11 below the groove 7. The circular plate 17 presses against the two semi-arc plates 14 hinged at the top of the mounting plate 13, causing the semi-arc plates 14 to open around the hinge point. The elastic element 15 is compressed. When the circular plate 17 is fully inside the space enclosed by the semi-arc plates 14, the elastic element 15 returns to its original position, generating an upward elastic force that pushes the two semi-arc plates 14 to clamp together. Through the proper fit between the semi-arc plates 14 and the circular plate 17, the slider 3 is stably positioned, thereby assisting the inflatable airbag 2 in maintaining the state of wrapping the frame 1 in a ring. After the electric flatbed is started, the on-board power supply is fully operational. The mechanism is powered by a controller 6 connected in series in the power supply circuit, which distributes a stable working voltage to components such as the pressure sensor 18, the air pump 8, and the electromagnetic exhaust valve 4. The mechanism enters the initialization state, and the controller 6 sends a start signal to the air pump 8. The air pump 8 delivers gas to the airbag 2 through the high-pressure air pipe 9. The high-pressure air pipe 9 is sealed to the connecting shaft 20 at the bottom of the airbag 2 by a snap-fit ​​method to ensure that there is no leakage in the gas delivery. During the inflation process, the pressure sensor 18 in the inner cavity of the airbag 2 collects pressure data in real time and transmits it to the controller 6 through the signal line. When the pressure sensor 18 detects that the internal pressure of the airbag has reached the preset value, the controller 6 receives the signal and shuts down the air pump 8. The airbag 2 remains in an inflated state, and the mechanism enters the standby protection mode.

[0076] During the operation of the electric flatbed cart, the pressure sensor 18 continuously monitors the internal pressure of the inflatable airbag 2 and feeds back the data to the controller 6 in real time. If the pressure is lower than the preset value, the controller 6 automatically starts the inflation pump 8 to replenish the pressure, ensuring that the airbag is always in an effective protective state. At the same time, the external pressure trigger switch 16 of the inflatable airbag 2 remains on standby to respond to collision signals at any time. When the electric flatbed cart travels to the vicinity of an obstacle, and the inflatable airbag 2 comes into contact with the obstacle first, there are two triggering logics: Mechanical trigger: The collision force causes the inflatable airbag 2 to squeeze the external pressure trigger switch 16, and the switch is linked with the electromagnetic exhaust valve 4, directly triggering the electromagnetic exhaust valve 4 to open; Electronic trigger: The airbag is deformed by pressure, causing the internal pressure to rise instantaneously. The pressure sensor 18 detects that the pressure exceeds the preset threshold and sends an overload signal to the controller 6. The controller 6 immediately controls the electromagnetic exhaust valve 4 to open.

[0077] After the electromagnetic exhaust valve 4 opens, the inflatable airbag 2 slowly deflates through the exhaust port, absorbing collision energy through the gas throttling effect to achieve flexible cushioning and prevent the frame 1 from directly bearing the impact force with the cargo. If the electromagnetic exhaust valve 4 malfunctions and cannot open, and the internal pressure of the airbag continues to rise to the limit value, the pressure relief valve connected in parallel with the air pump 8 will automatically open under the control of the controller 6 to ensure the safe depressurization of the airbag and ensure the cushioning effect. After the collision, the operator checks the status of the inflatable airbag 2. If the airbag is undamaged, the controller 6 issues an inflation command. The air pump 8 restarts to inflate the airbag until the pressure returns to the preset value. The mechanism then returns to standby mode and can be put into use again. If the airbag 2 needs to be disassembled or replaced, the operator pulls the slider 3 upward through the handle 5. The circular plate 17 squeezes the semi-arc plate 14 to open it, the elastic element 15 is compressed, and the slider 3 slides out along the slide groove 7 to release the auxiliary positioning of the airbag 2. Then, the high-pressure air pipe 9 is disconnected from the connecting shaft 20, and the airbag can be disassembled for maintenance or replacement. After maintenance, it can be reset according to the assembly process.

[0078] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0079] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A safety anti-collision mechanism for an electric flatbed cart, comprising a frame (1), characterized in that, The electric flatbed vehicle's safety collision avoidance mechanism also includes: An inflatable airbag (2) is annularly fitted around the outside of the frame (1). The height of the inflatable airbag (2) is the same as that of the frame (1). The inflatable airbag (2) is made of high-strength nylon fiber. Multiple grooves (7) are provided in two groups on the top of the frame (1); Multiple sliders (3) are slidably installed inside multiple grooves (7), the multiple grooves (7) and sliders (3) are diagonally distributed, and the multiple sliders (3) are L-shaped; A cushioning component is disposed on the inflatable airbag (2); Multiple snap-fit ​​components are disposed at the bottom of multiple sliders (3).

2. The electric flatbed car safety anti-collision mechanism according to claim 1, characterized in that, The buffer component includes: An air pump (8) is located on one side of the bottom of the frame (1); A connecting shaft (20) is installed on one side of the bottom of the inflatable airbag (2); A high-pressure air pipe (9) is installed on one side of the air pump (8). One end of the high-pressure air pipe (9) is connected to the connecting shaft (20). The high-pressure air pipe (9) is connected to the inside of the inflatable airbag (2) through the connecting shaft (20).

3. The electric flatbed car safety anti-collision mechanism according to claim 2, characterized in that, The buffer component also includes: An electromagnetic exhaust valve (4) is installed on one side of the top of the inflatable airbag (2); The controller (6) is fixedly installed on one side of the vehicle frame (1); A pressure sensor (18) is installed on one side of the inner cavity of the inflatable airbag (2). The pressure sensor (18) is electrically connected to the electromagnetic exhaust valve (4) through the PLC controller (6).

4. The electric flatbed car safety anti-collision mechanism according to claim 1, characterized in that, The snap-fit ​​assembly includes: A fixing block (19) is fixedly installed at the bottom of the slider (3); A circular plate (17) is fixedly installed at the bottom of the fixing block (19); An installation groove (11) is provided at the bottom of the slide groove (7), and the installation groove (11) is connected to the slide groove (7); Mounting plate (13) is installed at the bottom of the mounting slot (11); Two semi-circular plates (14) are hinged to the top of the mounting plate (13), and the circular plate (17) is adapted to the two semi-circular plates (14).

5. The electric flatbed car safety anti-collision mechanism according to claim 4, characterized in that, The snap-fit ​​assembly also includes: Two connecting blocks (12) are respectively installed on one side of the two semi-arc plates (14); Two elastic elements (15) are disposed between the mounting plate (13) and the two connecting blocks (12). The bottom ends of the two elastic elements (15) are connected to the top of the mounting plate (13), and the top ends of the two elastic elements (15) are respectively connected to the bottom of the two connecting blocks (12).

6. The electric flatbed car safety anti-collision mechanism according to claim 1, characterized in that, The electric flatbed vehicle's safety collision avoidance mechanism also includes: Multiple handles (5) are fixedly installed on the top of the slider (3).

7. The electric flatbed car safety anti-collision mechanism according to claim 3, characterized in that, The electric flatbed vehicle's safety collision avoidance mechanism also includes: Multiple pressure-triggered switches (16) are installed on one side of the outside of the inflatable airbag (2), and the pressure-triggered switches (16) are linked with the electromagnetic exhaust valve (4).

8. The electric flatbed car safety anti-collision mechanism according to claim 2, characterized in that, The electric flatbed vehicle's safety collision avoidance mechanism also includes: A mounting ring (10) is installed on one side of the bottom of the frame (1), and the mounting ring (10) encloses the air pump (8) in a ring.

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