Welding equipment for shield body structure of shield tunneling machine

Abstract

The invention belongs to the technical field of shield body structure welding, and particularly relates to shield body structure welding equipment of a shield tunneling machine, which comprises a welding table, a plurality of groups of roundness arc plates, a clamping plate type smoke guide mechanism and a thermal annealing type heat collection mechanism, the roundness arc plates are arranged on the upper wall of the welding table, and the clamping plate type smoke guide mechanism comprises a positioning assembly, an adsorption assembly, a filtering assembly and a guide assembly. The positioning assembly is arranged on the side wall of the welding table, the adsorption assembly is arranged on the side wall of the positioning assembly, the filtering assembly is arranged in the adsorption assembly, and the guiding assemblies are arranged at the two ends of the positioning assembly. According to the welding equipment for the shield body structure of the shield tunneling machine, welding smoke generated during welding can be purified, the smoke suction flow can be automatically adjusted according to the temperature of welding smoke air entering different areas, and therefore waste heat generated during welding is recycled.

Description

Technical Field

[0001] This invention belongs to the field of shield structure welding technology, specifically referring to a shield machine shield structure welding equipment. Background Technology

[0002] Due to differences in diameter and weight, the shield of a tunnel boring machine (TBM) is often disassembled into two, four, or even more pieces for assembly. Ensuring the precise positioning of the shell and other components during welding between these sections is a major technical challenge in manufacturing large TBMs.

[0003] The existing shield body structure welding equipment for tunnel boring machines currently has the following problems: When welding the spliced ​​shield body structure, the existing shield machine welding equipment requires a long weld seam due to the long splicing seam. As the weld seam length increases, a large amount of welding fumes are dispersed into the air, seriously endangering the health of welding workers. Furthermore, traditional shield machine shield body structure welding equipment does not have the ability to actively cool the weld seam or preheat the base material. Therefore, it cannot meet the current usage requirements for shield machine shield body structure welding equipment. Summary of the Invention

[0004] In response to the above situation and to overcome the shortcomings of the existing technology, this solution provides a shield machine shield structure welding equipment that can purify the welding fumes generated during welding and automatically adjust the fume intake flow rate according to the temperature of the welding fume air entering different areas, thereby reusing the residual heat generated during welding.

[0005] The technical solution adopted in this plan is as follows: The shield structure welding equipment proposed in this plan includes a welding table, a rounded arc plate, a clamp-type smoke guiding mechanism, and a heat-removing type heat collection mechanism. Multiple sets of the rounded arc plates are arranged on the upper wall of the welding table. The clamp-type smoke guiding mechanism includes a positioning component, an adsorption component, a filtering component, and a guiding component. The positioning component is arranged on the side wall of the welding table, the adsorption component is arranged on the side wall of the positioning component, the filtering component is arranged inside the adsorption component, and the guiding component is arranged at both ends of the positioning component. The heat-removing type heat collection mechanism includes a quantity control component and a heat collection component. The quantity control component is arranged on the side wall of the filtering component, and the heat collection component is arranged on the adsorption component.

[0006] As a further preferred embodiment of the present invention, the positioning component includes a sliding groove, a clamping arc plate, a hydraulic cylinder, and an annular block. Multiple sets of the sliding grooves are located on the sidewall of the welding table and are open on three sides. The clamping arc plate is slidably disposed inside the sliding groove. The hydraulic cylinder is located on the inner wall of the sliding groove, and its power end is fixedly connected to the sidewall of the clamping arc plate. The annular block is located at one end of the arc plate near the welding table. The adsorption component includes an air suction box, an air suction seat, an air pump, and an air suction pipe. The air suction box is located on the side of the clamping arc plate away from the arc plate. The air suction seat is located at the top of the air suction box on the side away from the clamping arc plate. The air pump is located inside the air suction seat, and the air suction pipe is located... The air pump has an air extraction end; the filter assembly includes a filter box, filter ports, and an activated carbon adsorption layer. The filter box is located on the inner wall of the air extraction box. The end of the air extraction pipe away from the air pump passes through the air extraction box and communicates with the filter box. Multiple sets of filter ports are located on both sides of the filter box. The activated carbon adsorption layer is located inside the filter box. The guide assembly includes a strip groove, a heat-resistant plate, a guide groove, and a guide tube. The strip groove is symmetrically located on the side walls at both ends of the clamping arc plate. The heat-resistant plate is located inside the strip groove. Multiple sets of guide grooves are located on the side of the heat-resistant plate near the rounded arc plate and are open on both sides. The guide tube passes through the heat-resistant plate and communicates between the guide groove and the air extraction box.

[0007] In use, the hydraulic cylinder extends to push the clamping arc plate, which slides along the slide groove away from the side wall of the roundness arc plate. Multiple shield arc plates are inserted between the roundness arc plate and the clamping arc plate in the circumferential direction. The bottom wall of the shield arc plate is in contact with the upper wall of the annular block. The hydraulic cylinder shortens to drive the clamping arc plate to slide along the slide groove and approach the roundness arc plate to fix the shield arc plate. Multiple sets of individual shield arc plates are spliced ​​together to form a complete shield. The operator performs welding operations along the splicing gaps between the shield arc plates. When operators weld the shield body along the long weld seam, a large amount of welding fumes are generated. At this time, the air pump draws air from the inside of the filter box through the air extraction pipe. The filter box draws air from the inside of the suction box through the filter port. The end of the heat-resistant plate away from the guide pipe is located on one side of the weld seam. The suction box draws air around the weld seam through the guide groove. The air containing welding fumes flows into the suction box through the guide groove and guide pipe. The air containing welding fumes inside the suction box flows into the filter box through the filter port. The activated carbon adsorption layer inside the filter box purifies and adsorbs the harmful substances in the welding fumes. The filtered air is discharged through the exhaust end of the air pump.

[0008] Preferably, the flow control assembly includes an arc-shaped rod, a magnetic ball, a sealing spring, a flow control sleeve, a flow control pipe, a conical groove, and a heat-resistant magnetic ring. Multiple sets of the arc-shaped rods are symmetrically arranged on both sides of the filter box. The magnetic ball is slidably arranged on the outside of the arc-shaped rod. The sealing spring is arranged between the magnetic ball on the outside of the arc-shaped rod and the filter box. The flow control sleeve is arranged on the inner wall of the suction box on one side of the arc-shaped rod. The flow control pipe is connected between the flow control sleeve and the guide pipe. The conical groove is arranged at the end of the flow control sleeve away from the flow control pipe. The heat-resistant magnetic ring is arranged on the outside of the flow control sleeve. The heat collection assembly includes an adapter, a bent pipe, and a jet nozzle. The adapter is arranged at the exhaust end of the suction pump. The bent pipe is rotatably arranged at the end of the adapter away from the suction pump. The jet nozzle is connected at the end of the bent pipe away from the adapter, and the exhaust port of the jet nozzle faces the inner wall of the circular arc plate and forms a preset angle with the inner wall.

[0009] In initial use, there is a gap between the magnetic ball and the conical groove. The heat-resistant magnetic ring is fixed to the outside of the gas control sleeve, attracting the magnetic ball. Under the elastic deformation of the sealing spring, the magnetic ball slides along the arc-shaped rod and approaches the conical groove. The sealing spring is in a stretched state. When the joint is in the welding state, the temperature of the welding fume air drawn into the corresponding guide groove is high. This high-temperature air will heat the magnetic ball. After being heated, the magnetic ball's magnetism weakens. The restoring force of the sealing spring is greater than the magnetic attraction force of the heat-resistant magnetic ring on the magnetic ball, and the sealing spring rebounds, pulling the magnetic ball back. As the ball slides away from the conical groove along the arc-shaped rod, the gap between the magnetic ball and the conical groove increases, and the corresponding flow rate of the guide groove increases, resulting in more air flowing through the welding area. A large amount of air heated by the welding area and containing welding fumes flows into the intake box and filter box for filtration. The filtered high-temperature air flows into the curved exhaust pipe, and the hot air inside the curved exhaust pipe is sprayed onto the inner wall of the shield's arc-shaped plate through the jet nozzle. The residual heat of the welding area is used to preheat the shield's arc-shaped plate, reducing the temperature difference between the weld and the base material, and reducing the thermal stress and shrinkage stress caused by uneven thermal expansion.

[0010] Specifically, a controller is provided on the upper wall of the welding platform.

[0011] The controller is electrically connected to the air pump.

[0012] The beneficial effects achieved by this solution using the above structure are as follows: Compared with existing technologies, this solution combines a clamp-type smoke guiding mechanism with a heat-removing type heat collection mechanism. Through the inclusion of positioning, adsorption, filtering, guiding, control, and heat collection components, it can adaptively adjust the gap between the magnetic ball and the conical groove based on the temperature of the air containing welding fumes. This facilitates adjustment of the air intake volume, thereby recovering a large amount of heat-containing air while reducing the entry of cooler air. The recovered heat is used to preheat the area to be welded on the arc-shaped plate of the shield. Furthermore, the guide groove extracts external air containing welding fumes... This mechanism can drive airflow in the weld area, actively cooling the weld. When the weld temperature decreases, the magnetic ball regains its magnetism, and the heat-resistant magnetic ring attracts the magnetic ball. The magnetic field strength between the heat-resistant magnetic ring and the magnetic ball is greater than the elasticity of the sealing spring, reducing the gap between the magnetic ball and the conical groove. On the one hand, this reduces the inflow of cooler air; on the other hand, when the weld cools to a certain temperature, the corresponding amount of air drawn by the guide groove decreases, thereby slowing down the cooling rate of the weld, significantly reducing residual stress and deformation risk, and promoting further diffusion and escape of hydrogen. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this solution; Figure 2 This is a bottom-view perspective of the design. Figure 3 This is a schematic diagram of the combined structure of the flow control component and the filter component in this solution; Figure 4 This is a schematic diagram of the combined structure of the positioning component and the adsorption component in this solution; Figure 5 This is a schematic diagram of the combined structure of the welding table, the roundness arc plate, and the positioning components in this solution; Figure 6 This is the main view of this solution; Figure 7 This is a side view of the design. Figure 8 This is a top view of the plan; Figure 9 for Figure 8 Sectional view of AA section; Figure 10 for Figure 6 Sectional view of BB section; Figure 11 for Figure 1 Enlarged structural view of section I; Figure 12 for Figure 3 Enlarged structural view of Part II; Figure 13 for Figure 10 Enlarged structural view of Part III.

[0014] The components include: 1. Welding table; 2. Rounded arc plate; 3. Clamp-type smoke guiding mechanism; 4. Positioning component; 5. Slide groove; 6. Clamping arc plate; 7. Hydraulic cylinder; 8. Ring block; 9. Adsorption component; 10. Suction box; 11. Suction seat; 12. Air pump; 13. Suction pipe; 14. Filter component; 15. Filter box; 16. Filter port; 17. Activated carbon adsorption layer; 18. Guiding component; 19. Strip groove; 20. Heat-resistant plate; 21. Guide groove; 22. Guide tube; 23. Heat-removing type heat collection mechanism; 24. Quantity control component; 25. Arc rod; 26. Magnetic ball; 27. Sealing spring; 28. Air control sleeve; 29. ​​Air control tube; 30. Conical groove; 31. Heat collection component; 32. Adapter; 33. Bent pipe; 34. Air nozzle; 35. Controller; 36. Temperature-resistant magnetic ring.

[0015] The accompanying drawings are provided to further understand the present solution and form part of the specification. They are used together with the embodiments of the present solution to explain the present solution and do not constitute a limitation thereof. Detailed Implementation

[0016] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this solution, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this solution without creative effort are within the scope of protection of this solution.

[0017] In the description of this solution, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this solution and simplifying the description, and do not indicate or imply that the device or element 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 solution.

[0018] like Figures 1-13 As shown, the proposed solution provides a shield structure welding device for a tunnel boring machine, comprising a welding table 1, a rounded arc plate 2, a clamp-type smoke guiding mechanism 3, and a heat-removing type heat collection mechanism 23. Multiple sets of the rounded arc plates 2 are disposed on the upper wall of the welding table 1. The clamp-type smoke guiding mechanism 3 includes a positioning component 4, an adsorption component 9, a filtering component 14, and a guiding component 18. The positioning component 4 is disposed on the side wall of the welding table 1, the adsorption component 9 is disposed on the side wall of the positioning component 4, the filtering component 14 is disposed inside the adsorption component 9, and the guiding component 18 is disposed at both ends of the positioning component 4. The heat-removing type heat collection mechanism 23 includes a quantity control component 24 and a heat collection component 31. The quantity control component 24 is disposed on the side wall of the filtering component 14, and the heat collection component 31 is disposed on the adsorption component 9.

[0019] The positioning component 4 includes a sliding groove 5, a clamping arc plate 6, a hydraulic cylinder 7, and an annular block 8. Multiple sets of the sliding grooves 5 are located on the side wall of the welding table 1 and are open on three sides. The clamping arc plate 6 is slidably disposed inside the sliding groove 5. The hydraulic cylinder 7 is located on the inner wall of the sliding groove 5, and its power end is fixedly connected to the side wall of the clamping arc plate 6. The annular block 8 is located at one end of the rounded arc plate 2 near the welding table 1. The adsorption component 9 includes an air suction box 10, an air suction seat 11, an air pump 12, and an air suction pipe 13. The air suction box 10 is located on the side of the clamping arc plate 6 away from the rounded arc plate 2. The air suction seat 11 is located at the top of the air suction box 10 on the side away from the clamping arc plate 6. The air pump 12 is located inside the air suction seat 11, and the air suction pipe 13 is located at the air suction end of the air pump 12. The filtering component 1... 4 includes a filter box 15, filter ports 16, and an activated carbon adsorption layer 17. The filter box 15 is located on the inner wall of the suction box 10. The end of the suction pipe 13 away from the suction pump 12 passes through the suction box 10 and communicates with the filter box 15. Multiple sets of filter ports 16 are located on both sides of the filter box 15. The activated carbon adsorption layer 17 is located inside the filter box 15. The guide assembly 18 includes a strip groove 19, a heat-resistant plate 20, a guide groove 21, and a guide tube 22. The strip groove 19 is symmetrically located on the side walls at both ends of the clamping arc plate 6. The heat-resistant plate 20 is located inside the strip groove 19. Multiple sets of guide grooves 21 are located on the side of the heat-resistant plate 20 near the rounded arc plate 2 and are open on both sides. The guide tube 22 passes through the heat-resistant plate 20 and communicates between the guide groove 21 and the suction box 10.

[0020] The flow control component 24 includes an arc-shaped rod 25, a magnetic ball 26, a sealing spring 27, a flow control sleeve 28, a flow control tube 29, a conical groove 30, and a heat-resistant magnetic ring 36. Multiple sets of the arc-shaped rods 25 are symmetrically arranged on both sides of the filter box 15. The magnetic ball 26 is slidably disposed on the outside of the arc-shaped rod 25. The sealing spring 27 is disposed between the magnetic ball 26 and the filter box 15 on the outside of the arc-shaped rod 25. The flow control sleeve 28 is disposed on the inner wall of the suction box 10 on one side of the arc-shaped rod 25. The flow control tube 29 is connected to the flow control... Between the gas sleeve 28 and the guide tube 22, the conical groove 30 is provided at the end of the gas control sleeve 28 away from the gas control tube 29, and the heat-resistant magnetic ring 36 is provided on the outside of the gas control sleeve 28; the heat collection assembly 31 includes an adapter 32, a bent pipe 33 and a jet nozzle 34. The adapter 32 is provided at the exhaust end of the air pump 12. The bent pipe 33 is rotatably provided at the end of the adapter 32 away from the air pump 12. The jet nozzle 34 is connected to the end of the bent pipe 33 away from the adapter 32, and the exhaust port of the jet nozzle 34 faces the inner wall of the rounded arc plate and forms a preset angle with the inner wall.

[0021] The upper wall of the welding table 1 is equipped with a controller 35.

[0022] The controller 35 is electrically connected to the air pump 12.

[0023] In actual use, in the initial state, there is a minimum gap between the magnetic ball 26 and the conical groove 30. The heat-resistant magnetic ring 36 is fixed on the outside of the gas control sleeve 28 to attract the magnetic ball 26. The magnetic ball 26 slides along the arc rod 25 and approaches the conical groove 30 by utilizing the elastic deformation of the sealing spring 27. The sealing spring 27 is in a stretched state. During shield welding, the bent pipe 33 rotates along the adapter 32, causing the air nozzle 34 to move away from the top of the rounded arc plate 2. The controller 35 controls the hydraulic cylinder 7 to start, and the power end of the hydraulic cylinder 7 extends to push the clamping arc plate 6. The clamping arc plate 6 slides along the slide groove 5 away from the side wall of the rounded arc plate 2, increasing the distance between the rounded arc plate 2 and the clamping arc plate 6. The operator uses the hoisting equipment to insert multiple shield arc plates along the circumferential direction between the rounded arc plate 2 and the clamping arc plate 6. The bottom wall of the shield arc plate is in contact with the upper wall of the annular block 8. The power end of the hydraulic cylinder 7 shortens, causing the clamping arc plate 6 to slide along the slide groove 5 closer to the rounded arc plate 2, fixing the shield arc plate. Multiple sets of individual shield arc plates are spliced ​​together to form a complete shield. The bent pipe 33 is manually rotated to rotate along the adapter 32, causing the air nozzle 34 to return to the top of the inner side of the rounded arc plate. The operator then performs welding operations along the splicing seam between the shield arc plates. When the operator welds the shield body splice seam from bottom to top along the long weld seam, a large amount of welding fumes will be generated. At this time, the controller 35 controls the air pump 12 to start. The air pump 12 draws air from the inside of the filter box 15 through the air extraction pipe 13. The filter box 15 draws air from the inside of the suction box 10 through the filter port 16. The end of the heat-resistant plate 20 away from the guide pipe 22 is located on the side of the weld seam. The suction box 10 draws air around the weld seam through the guide groove 21. The air containing welding fumes flows into the suction box 10 through the guide groove 21 and the guide pipe 22. The air containing welding fumes in the suction box 10 flows into the filter box 15 through the filter port 16. The activated carbon adsorption layer 17 in the filter box 15 purifies and adsorbs the harmful substances in the welding fumes. When the joint is in the welding state, the air containing welding fumes drawn in by the corresponding guide groove 21 is at a higher temperature. When the higher temperature air comes into contact with the magnetic ball 26, it heats the magnetic ball 26. After being heated, the magnetic magnetism of the magnetic ball 26 weakens. At this time, the reset force of the sealing spring 27 is greater than the magnetic attraction force of the heat-resistant magnetic ring 36 on the magnetic ball 26. The sealing spring 27 rebounds and pulls the magnetic ball 26 to slide away from the conical groove 30 along the arc rod 25. The gap between the magnetic ball 26 and the conical groove 30 increases, and the air flow rate drawn in by the corresponding guide groove 21 increases, resulting in more air flowing through the welding area. A large amount of air containing welding fumes heated by the welding area flows into the air intake box 10 and the filter box 15 for filtration. The filtered air at a higher temperature flows into the curved exhaust pipe 33 through the exhaust end of the air pump 12. The hot air inside the curved exhaust pipe 33 is sprayed onto the inner wall of the shield arc plate through the jet nozzle 34. The residual heat of the welding area is used to preheat the shield arc plate, reduce the temperature difference between the weld and the base material, and reduce the thermal stress and shrinkage stress caused by uneven thermal expansion. The guide groove 21 draws air from the weld area, causing airflow around the weld and achieving active cooling of the weld. When the weld temperature decreases, the corresponding magnetic ball 26 slides along the arc rod 25 under the magnetic attraction of the heat-resistant magnetic ring 36, stretching the sealing spring 27. The sealing spring 27 then returns to a stretched state, and the gap between the magnetic ball 26 and the conical groove 30 is reduced to a minimum, thereby reducing the mixing of low-temperature air with high-temperature air. On the one hand, this fully utilizes the residual heat of welding; on the other hand, the controlled and slow cooling of the weld after its temperature drops significantly reduces residual stress and deformation risk, promotes further diffusion and escape of hydrogen, and prevents the generation of hydrogen-induced delayed cracks. The above operation can be repeated for the next use.

[0024] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] The present solution and its implementation methods have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present solution; the actual structure is not limited to this. In conclusion, if a person skilled in the art, inspired by this description, designs a similar structure and embodiment without departing from the inventive intent of this solution, such design should fall within the protection scope of this solution.

Claims

1. A welding equipment for the shield structure of a tunnel boring machine, comprising a welding table and a circular arc plate, characterized in that: It also includes a clamp-type smoke guiding mechanism and a heat-removing type heat collection mechanism. Multiple sets of rounded arc plates are set on the upper wall of the welding table. The clamp-type smoke guiding mechanism includes a positioning component, an adsorption component, a filter component, and a guide component. The positioning component is set on the side wall of the welding table, the adsorption component is set on the side wall of the positioning component, the filter component is set inside the adsorption component, and the guide component is set at both ends of the positioning component. The heat-removing type heat collection mechanism includes a quantity control component and a heat collection component. The quantity control component is set on the side wall of the filter component, and the heat collection component is set on the adsorption component. The adsorption assembly includes an air intake box; The filtration assembly includes a filter box; The guiding assembly includes a guide tube; The flow control assembly includes an arc-shaped rod, a magnetic ball, a sealing spring, a gas control sleeve, a gas control tube, a conical groove, and a temperature-resistant magnetic ring; Multiple sets of arc-shaped rods are symmetrically arranged on both sides of the filter box. Magnetic balls are slidably arranged on the outside of the arc-shaped rods. A sealing spring is arranged between the magnetic ball on the outside of the arc-shaped rods and the filter box. An air control sleeve is arranged on the inner wall of the air intake box on one side of the arc-shaped rods. An air control pipe is connected between the air control sleeve and the guide pipe. A conical groove is arranged at the end of the air control sleeve away from the air control pipe. A heat-resistant magnetic ring is arranged on the outside of the air control sleeve.

2. The shield body structure welding equipment for a tunnel boring machine according to claim 1, characterized in that: The positioning component includes a chute, a clamping arc plate, a hydraulic cylinder, and an annular block. Multiple sets of the chute are provided on the side wall of the welding table and are open on three sides. The clamping arc plate is slidably disposed inside the chute. The hydraulic cylinder is disposed on the inner wall of the chute and its power end is fixedly connected to the side wall of the clamping arc plate. The annular block is disposed at one end of the arc plate near the welding table.

3. The shield body structure welding equipment for a tunnel boring machine according to claim 2, characterized in that: The adsorption assembly also includes an air intake seat, an air pump, and an air extraction pipe. The air intake box is located on the side of the clamping arc plate away from the roundness arc plate. The air intake seat is located on the top of the side of the air intake box away from the clamping arc plate. The air pump is located inside the air intake seat, and the air extraction pipe is located at the air extraction end of the air pump.

4. The shield body structure welding equipment for a tunnel boring machine according to claim 3, characterized in that: The filter assembly also includes a filter port and an activated carbon adsorption layer. The filter box is located on the inner wall of the air intake box, and multiple sets of the filter ports are located on both sides of the filter box. The activated carbon adsorption layer is located inside the filter box.

5. The shield body structure welding equipment for a tunnel boring machine according to claim 4, characterized in that: The guiding assembly includes a strip groove, a heat-resistant plate, and a guide groove. The strip groove is symmetrically arranged on the side walls at both ends of the clamping arc plate. The heat-resistant plate is located inside the strip groove. Multiple sets of the guide grooves are located on the side of the heat-resistant plate near the rounded arc plate and are open on both sides. The guide tube passes through the heat-resistant plate and is connected between the guide groove and the air intake box.

6. The shield body structure welding equipment for a tunnel boring machine according to claim 3, characterized in that: The end of the suction pipe away from the suction pump passes through the suction box and connects to the filter box.

7. The shield body structure welding equipment for a tunnel boring machine according to claim 3, characterized in that: The heat collection assembly includes an adapter, a bent pipe, and a jet nozzle. The adapter is located at the exhaust end of the air pump. The bent pipe is rotatably located at the end of the adapter away from the air pump. The jet nozzle is connected to the end of the bent pipe away from the adapter, and the exhaust port of the jet nozzle faces the inner wall of the circular arc plate, forming an angle with it.

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