Drilling device for metal file cabinet machining

Abstract

The utility model discloses a drilling device for metal file cabinet machining, which comprises a machining table and supporting legs fixedly arranged at the bottom of the machining table, a metal cabinet body is borne in the center of the top of the machining table, a top plate is arranged above the top of the machining table, and electric push rods are fixedly connected to the left side and the right side of the machining table. The telescopic ends of the tops of the two electric push rods are fixedly connected with the left end and the right end of the bottom of the top plate, and a drilling piece for drilling the metal cabinet body is rotationally connected to the lower portion of the top plate. The device has the advantages of being flexible in adjustment and good in positioning effect, through the design, efficient and accurate clamping of metal file cabinet plates is achieved, the clamping effect is enhanced by introducing a pneumatic system, the device adapts to materials of different thicknesses and hardness, and the efficiency and quality of drilling operation are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of drilling technology, specifically a drilling device for processing metal filing cabinets. Background Technology

[0002] Drilling is a crucial step in the manufacturing of metal filing cabinets, used to create holes for assembly, installation, or functionality. Specialized drilling equipment can improve drilling accuracy and efficiency while ensuring operator safety.

[0003] Existing drilling devices can be referenced from Chinese Utility Model Patent No. CN213257212U, which discloses a drilling device for filing cabinet production. This device effectively reduces labor intensity, improves work efficiency, makes fixing sheet metal easier and more convenient, and reduces usage limitations. It includes a processing table, a vertical frame, a feed motor, a feed screw, a lifting plate, a drive motor, and a drill bit. The bottom of the processing table has four sets of support legs. The bottom of the vertical frame is connected to the top of the processing table. The feed motor is fixedly mounted on the vertical frame. The feed screw is rotatably mounted on the vertical frame through a connection with the output end of the feed motor. Two sets of slide rails are provided on the right end of the vertical frame. A connecting sleeve is provided on the lifting plate. The lifting plate is slidably mounted on the two sets of slide rails through the cooperation of the connecting sleeve and the feed screw. The drive motor is fixedly mounted on the top of the lifting plate. A drill bit chuck is provided at the output end of the drive motor. The drill bit is detachably and fixedly mounted on the drill bit chuck. A clamping device is fixedly mounted on the top of the processing table.

[0004] The device has a good working effect, but there are still some defects in actual use: the positioning effect of the device on the filing cabinet is not ideal. If it cannot adapt to filing cabinet panels of different sizes and shapes, it may lead to unstable fixing and affect the drilling quality. Utility Model Content

[0005] The purpose of this utility model is to provide a drilling device for processing metal filing cabinets, which has the advantages of flexible adjustment and good positioning effect. This design not only realizes efficient and precise clamping of metal filing cabinet plates, but also enhances the clamping effect by introducing a pneumatic system, adapting to materials of different thicknesses and hardness, and significantly improving the efficiency and quality of drilling operations.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a drilling device for processing metal filing cabinets, comprising a processing table and support legs fixedly installed at its bottom. The metal cabinet body is supported at the top center of the processing table, and a top plate is provided above the top of the processing table. Electric push rods are fixedly connected to both sides of the processing table, and the top telescopic ends of the two electric push rods are fixedly connected to the left and right ends of the bottom of the top plate. A drilling component for drilling holes in the metal cabinet body is rotatably connected below the top plate.

[0007] The top of the processing table has at least four guide grooves arranged in a circular array, and at least four clamping shells are arranged in a circular array on the top of the processing table. The four clamping shells are close to each other on one side and fit against the four side surfaces of the metal cabinet body. The bottom of each of the four clamping shells is fixedly connected to a connecting rod. The bottom of the four connecting rods extends into the interior of the processing table and slides between them and the inner wall of the guide groove. The moving path of the four connecting rods is from the circumference of the processing table to its center.

[0008] As a preferred embodiment of the drilling device for processing metal filing cabinets according to this utility model, a bevel gear ring is rotatably connected to the center of the bottom of the inner wall of the processing table. At least four driven bevel gears are meshed in a circumferential array at the top of the bevel gear ring. A horizontally arranged lead screw is fixedly connected to the inner wall of each of the four driven bevel gears. A lead screw sleeve is threaded onto the surface of each of the four lead screws. A protective cover is fixedly connected to the center of the bottom of the processing table.

[0009] As a preferred embodiment of the drilling device for processing metal filing cabinets according to this utility model, a first motor is fixedly connected to the bottom of the inner wall of the protective cover, the top output shaft of the first motor extends to the inside of the processing table and is fixedly connected to the inner wall of the bevel gear ring, and each of the four lead screws is rotatably connected to a mounting block near the end surface of the driven bevel gear, and the bottom of the four mounting blocks is fixedly connected to the bottom of the inner wall of the processing table.

[0010] In a preferred embodiment of the drilling device for processing metal filing cabinets according to this utility model, the tops of the four lead screw sleeves are fixedly connected to the bottoms of the four connecting rods, the ends of the four lead screws away from the four mounting blocks are rotatably connected to the inner wall of the processing table, guide rods are fixedly connected between the four mounting blocks and the inner wall of the processing table, and the four guide rods are slidably connected to the four lead screw sleeves.

[0011] As a preferred embodiment of the drilling device for processing metal filing cabinets according to this utility model, each of the four clamping shells has a horizontally arranged bidirectional threaded rod rotatably connected to its internal center. A worm gear is fixedly sleeved on the center of the surface of each bidirectional threaded rod. A worm is meshed with the top of each of the four worm gears. A rectangular cover is fixedly connected to each of the four clamping shells on the side away from each other.

[0012] As a preferred embodiment of the drilling device for processing metal filing cabinets according to this utility model, a second motor is provided inside the upper part of the rectangular cover. The second motor is fixedly installed on one side of the clamping shell. The output shaft of the second motor is fixedly connected to one end of the worm gear. Threaded sleeves are threadedly connected to both sides of the surface of the bidirectional threaded rod. The two threaded sleeves extend to the outer sides of the clamping shell and are slidably connected thereto at one end. A horizontally arranged limiting rod is fixedly connected between the lower parts of the four clamping shells.

[0013] In a preferred embodiment of the drilling device for processing metal filing cabinets according to this utility model, the limiting rod is slidably connected to the threaded sleeve, and a rectangular shell is fixedly connected to one end of each of the two threaded sleeves located outside the clamping shell. An air pump is provided inside the lower part of the rectangular shell, and the air pump is fixedly connected to one side of the clamping shell. The air pump's suction end extends to the outside of the rectangular shell and is fixedly connected thereto. Each rectangular shell is provided with an airbag, and multiple abutment rods are equidistantly connected to one side of each airbag from top to bottom.

[0014] In a preferred embodiment of the drilling device for processing metal filing cabinets according to this utility model, the ends of the plurality of abutment rods, away from the air bladder, penetrate through the air bladder and extend to the outside of the rectangular shell. A plurality of sealing rings are fixedly connected between each rectangular shell and the air bladder. The surface of the abutment rod is slidably connected to the inner wall of the sealing ring. A U-shaped corrugated tube is fixedly connected between two air bladders located on the left and right sides of the same clamping shell. The U-shaped corrugated tube extends to the outside of the rectangular shell and is slidably connected thereto. A connecting pipe is fixedly connected to the air pump outlet end. The end of the connecting pipe away from the air pump extends to the outside of the rectangular cover and is fixedly connected to one side of the U-shaped corrugated tube.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model involves starting a first motor, whose output shaft drives a bevel gear ring to rotate. As the bevel gear ring rotates, the driven bevel gear rotates accordingly, which in turn drives a lead screw to rotate. A lead screw sleeve is threaded onto the surface of the lead screw. The rotation of the lead screw causes the lead screw sleeve to move along the length of the lead screw. As the lead screw sleeve moves, the connecting rod also moves accordingly, causing the clamping shell to move towards the center of the processing table until it is tightly fitted to the four sides of the metal cabinet body, completing the initial fixation.

[0017] 2. This utility model utilizes a second motor, whose output shaft drives a worm gear to rotate. The worm gear meshes with a bidirectional threaded rod, causing the bidirectional threaded rod to rotate. Because the bidirectional threaded rod has threads in opposite directions, its rotation causes the two threaded sleeves to move closer or further apart. A rectangular shell is fixedly connected to one end of each threaded sleeve outside the clamping housing. The air pump is then activated, supplying air to the U-shaped bellows through a connecting pipe, which inflates the airbags on both sides. As the airbags expand, the abutment rod is pushed out of the rectangular shell, applying uniform pressure to the metal cabinet body and achieving a secure clamping. Attached Figure Description

[0018] Figure 1 This is a three-dimensional drawing of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of this utility model;

[0020] Figure 3This is a schematic diagram of the structure of the clamping shell of this utility model.

[0021] In the diagram: 1. Machining table; 101. Guide groove; 2. Support leg; 3. Electric push rod; 4. Top plate; 5. Drilling part; 6. Clamping shell; 7. First motor; 701. Protective cover; 8. Bevel gear ring; 9. Driven bevel gear; 10. Mounting block; 11. Lead screw; 12. Lead screw sleeve; 13. Guide rod; 14. Connecting rod; 15. Bidirectional threaded rod; 16. Worm gear; 17. Worm; 18. Rectangular cover; 19. Second motor; 20. Threaded sleeve; 21. Limiting rod; 22. Rectangular shell; 23. Airbag; 24. Abutment rod; 25. Sealing ring; 26. U-shaped bellows; 27. Air pump; 28. Connecting pipe; A. Metal cabinet body. Detailed Implementation

[0022] Please see Figures 1-3 A drilling device for processing metal filing cabinets includes a processing table 1 and support legs 2 fixedly installed at its bottom. The metal cabinet body A is supported at the top center of the processing table 1. A top plate 4 is provided above the top of the processing table 1. Electric push rods 3 are fixedly connected to both sides of the processing table 1. The top extension ends of the two electric push rods 3 are fixedly connected to the bottom left and right ends of the top plate 4. A drilling component 5 for drilling holes in the metal cabinet body A is rotatably connected below the top plate 4.

[0023] Furthermore, the top of the processing table 1 is provided with at least four guide grooves 101 arranged in a circular array, and the top of the processing table 1 is provided with at least four clamping shells 6 arranged in a circular array. The four clamping shells 6 are close to each other on one side and are in contact with the four side surfaces of the metal cabinet body A. The bottom of each of the four clamping shells 6 is fixedly connected with a connecting rod 14. The bottom of the four connecting rods 14 extends into the interior of the processing table 1 and is slidably connected to the inner wall of the guide groove 101. The moving path of the four connecting rods 14 is from the circumference of the processing table 1 to its center.

[0024] The processing table 1 serves as the basic platform for the entire device, supporting the metal cabinet body A to be processed. Its top center is specifically designed to hold the metal cabinet body A. Support legs 2 are fixedly installed at the bottom of the processing table 1, providing stable support. Each side of the processing table 1 is equipped with an electric push rod 3. The telescopic end of the electric push rod 3 is connected to the bottom of the top plate 4, controlling the raising and lowering of the top plate 4 to adjust the position of the drilling component 5. The drilling component 5 is rotatably connected below the top plate 4 for performing drilling operations. The drilling component 5 is installed below the top plate 4 and can rotate to drill holes in the metal cabinet body A.

[0025] At least four guide grooves 101 arranged in a circular array on the top of the processing table 1 provide a sliding path for the connecting rod 14, allowing the clamping shell 6 to move towards the center of the processing table 1. The processing table 1 has at least four clamping shells 6 arranged around the metal cabinet body A, with the inner surface of each clamping shell 6 tightly fitted to the four side surfaces of the metal cabinet body A, ensuring the metal cabinet body A is securely fixed. A connecting rod 14 is fixedly connected to the bottom of each clamping shell 6. The connecting rod 14 passes through the processing table 1 and slides along the guide grooves 101, enabling the clamping shell 6 to move towards or away from the center of the processing table 1.

[0026] Furthermore, a bevel gear ring 8 is rotatably connected at the bottom center of the inner wall of the processing table 1. At least four driven bevel gears 9 are meshed in a circumferential array at the top of the bevel gear ring 8. A horizontally arranged lead screw 11 is fixedly connected to the inner wall of each of the four driven bevel gears 9. A lead screw sleeve 12 is threadedly connected to the surface of each of the four lead screws 11. A protective cover 701 is fixedly connected at the bottom center of the processing table 1.

[0027] Furthermore, a first motor 7 is fixedly connected to the bottom of the inner wall of the protective cover 701. The top output shaft of the first motor 7 extends into the interior of the processing table 1 and is fixedly connected to the inner wall of the bevel gear ring 8. Mounting blocks 10 are rotatably connected to the surface of the four lead screws 11 near the driven bevel gear 9. The bottom of the four mounting blocks 10 is fixedly connected to the bottom of the inner wall of the processing table 1.

[0028] Furthermore, the tops of the four lead screw sleeves 12 are fixedly connected to the bottoms of the four connecting rods 14, the ends of the four lead screws 11 away from the four mounting blocks 10 are rotatably connected to the inner wall of the processing table 1, and guide rods 13 are fixedly connected between the four mounting blocks 10 and the inner wall of the processing table 1, and the four guide rods 13 are slidably connected to the four lead screw sleeves 12.

[0029] Furthermore, each of the four clamping shells 6 has a horizontally arranged bidirectional threaded rod 15 rotatably connected to its internal center. A worm gear 16 is fixedly sleeved on the center of the surface of the bidirectional threaded rod 15. A worm 17 is meshed with the top of each of the four worm gears 16. A rectangular cover 18 is fixedly connected to each of the four clamping shells 6 on the side away from each other.

[0030] When it is necessary to fix the metal cabinet body A, the first motor 7 is started, and its output shaft drives the bevel gear ring 8 to rotate. Since the bevel gear ring 8 meshes with the driven bevel gear 9, this will cause all driven bevel gears 9 to rotate synchronously. The rotation of each driven bevel gear 9 will drive the lead screw 11 connected to it to rotate, thereby causing the lead screw sleeve 12 to move along the axial direction of the lead screw 11. Since the lead screw sleeve 12 is fixedly connected to the bottom of the connecting rod 14, the connecting rod 14 moves accordingly, causing the clamping shell 6 to move toward or away from the metal cabinet body A, thereby achieving a stable clamping of the metal cabinet body A. Through a precise gear transmission system, the position of the clamping shell 6 can be precisely controlled, improving the positioning accuracy of the metal cabinet body A.

[0031] Furthermore, a second motor 19 is provided inside the rectangular cover 18 at the top. The second motor 19 is fixedly installed on one side of the clamping shell 6. The output shaft of the second motor 19 is fixedly connected to one end of the worm gear 17. Threaded sleeves 20 are threadedly connected to both sides of the surface of the bidirectional threaded rod 15. The two threaded sleeves 20 extend to the outside of the clamping shell 6 at one end and are slidably connected thereto. A horizontally set limiting rod 21 is fixedly connected between the lower interiors of the four clamping shells 6.

[0032] When more precise positioning and fixing of the metal cabinet body A is required, the second motor 19 is activated. Its output shaft drives the worm gear 17 to rotate, and the worm gear 17 meshes with the bidirectional threaded rod 15, causing the bidirectional threaded rod 15 to rotate accordingly. Since the bidirectional threaded rod 15 has threads in opposite directions, this allows the two threaded sleeves 20 to move inward or outward along the bidirectional threaded rod 15, enabling fine-tuning as needed, thereby achieving precise fixing of metal cabinet bodies A of different sizes and shapes.

[0033] Furthermore, the limiting rod 21 is slidably connected to the threaded sleeve 20. Both threaded sleeves 20 are fixedly connected to a rectangular shell 22 at one end outside the clamping shell 6. An air pump 27 is provided inside the rectangular cover 18 at the bottom. The air pump 27 is fixedly connected to one side of the clamping shell 6. The air pump 27's suction end extends to the outside of the rectangular cover 18 and is fixedly connected to it. Each rectangular shell 22 is provided with an airbag 23. Each airbag 23 is slidably connected from top to bottom to one side of each other with multiple equally spaced abutment rods 24.

[0034] Furthermore, multiple abutment rods 24 pass through the airbag 23 at the end away from the airbag 23 and extend to the outside of the rectangular shell 22. Multiple sealing rings 25 are fixedly connected between each rectangular shell 22 and the airbag 23. The surface of the abutment rod 24 is slidably connected to the inner wall of the sealing ring 25. U-shaped bellows 26 are fixedly connected between the two airbags 23 located on the left and right sides of the same clamping shell 6. The U-shaped bellows 26 extends to the outside of the rectangular shell 22 and is slidably connected to it. A connecting pipe 28 is fixedly connected to the air outlet end of the air pump 27. The end of the connecting pipe 28 away from the air pump 27 extends to the outside of the rectangular cover 18 and is fixedly connected to one side of the U-shaped bellows 26.

[0035] The air pump 27 is activated, supplying air to the U-shaped corrugated pipe 26 through the connecting pipe 28. This inflates the airbags 23 on both sides. As the airbags 23 expand, the abutment rod 24 is pushed out of the rectangular shell 22, applying uniform pressure to the metal cabinet body A for secure clamping. The sealing ring 25 ensures that the gas inside the airbags 23 does not leak, while allowing the abutment rod 24 to slide smoothly during the inflation of the airbags 23. The limiting rod 21 ensures that the threaded sleeve 20 moves in a straight line, providing stable support. The U-shaped corrugated pipe 26 not only connects the airbags 23 on both sides but also automatically adjusts the air pressure on both sides during inflation, ensuring uniform clamping force distribution and preventing deformation of the plate due to excessive pressure on one side.

[0036] By utilizing the design of the airbag 23 and the abutment rod 24, uniform pressure can be applied to the metal cabinet body A, improving the stability and safety of clamping. By controlling the inflation of the airbag 23 through the air pump 27, the clamping force can be easily adjusted to adapt to materials of different thicknesses and hardnesses.

[0037] The first motor 7 is started, and its output shaft drives the bevel gear ring 8 to rotate. As the bevel gear ring 8 rotates, the driven bevel gear 9 rotates accordingly, which in turn drives the lead screw 11 to rotate. The lead screw 11 is threadedly connected to the lead screw sleeve 12. The rotation of the lead screw 11 causes the lead screw sleeve 12 to move along the length of the lead screw 11. As the lead screw sleeve 12 moves, the connecting rod 14 also moves accordingly, causing the clamping shell 6 to move towards the center of the processing table 1 until it is tightly fitted with the four sides of the metal cabinet body A, completing the initial fixation.

[0038] To further enhance the clamping effect, the second motor 19 is activated, and its output shaft drives the worm gear 17 to rotate. The worm gear 17 meshes with the bidirectional threaded rod 15, causing the bidirectional threaded rod 15 to rotate. Since the bidirectional threaded rod 15 has threads in opposite directions, its rotation causes the two threaded sleeves 20 to move closer or further apart. Each threaded sleeve 20 has a rectangular shell 22 fixedly connected to one end outside the clamping shell 6. The air pump 27 is activated, supplying air to the U-shaped bellows 26 through the connecting pipe 28, thereby inflating the airbags 23 on both sides. As the airbags 23 inflate, the abutment rod 24 is pushed out of the rectangular shell 22, applying uniform pressure to the metal cabinet body A to achieve a firm clamping. Multiple sealing rings 25 are fixedly connected between each rectangular shell 22 and the airbag 23 to ensure that the gas does not leak while allowing the abutment rod 24 to slide freely. The U-shaped bellows 26 is fixedly connected between the two airbags 23 on the left and right sides of the same clamping shell 6 to balance the air pressure on both sides, ensuring that the clamping force is evenly distributed and avoiding deformation of the plate due to excessive pressure on one side.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drilling device for processing metal filing cabinets, comprising a processing table (1) and support legs (2) fixedly disposed at its bottom, wherein a metal cabinet body (A) is supported at the top center of the processing table (1), a top plate (4) is provided above the top of the processing table (1), and electric push rods (3) are fixedly connected to both the left and right sides of the processing table (1), the top extension ends of the two electric push rods (3) are fixedly connected to the bottom left and right ends of the top plate (4), and a drilling component (5) for drilling holes in the metal cabinet body (A) is rotatably connected below the top plate (4), characterized in that: The processing table (1) has at least four guide grooves (101) arranged in a circular array on its top. The processing table (1) also has at least four clamping shells (6) arranged in a circular array on its top. The four clamping shells (6) are close to each other on one side and fit against the four sides of the metal cabinet body (A). The bottom of each of the four clamping shells (6) is fixedly connected to a connecting rod (14). The bottom of the four connecting rods (14) extends into the processing table (1) and slides between the inner wall of the guide groove (101). The moving path of the four connecting rods (14) is from the circumference of the processing table (1) to its center.

2. The drilling device for processing metal filing cabinets as described in claim 1, characterized in that: A bevel gear ring (8) is rotatably connected to the bottom center of the inner wall of the processing table (1). At least four driven bevel gears (9) are meshed in a circular array at the top of the bevel gear ring (8). A horizontally arranged lead screw (11) is fixedly connected to the inner wall of each of the four driven bevel gears (9). A lead screw sleeve (12) is threaded onto the surface of each of the four lead screws (11). A protective cover (701) is fixedly connected to the bottom center of the processing table (1).

3. The drilling device for processing metal filing cabinets as described in claim 2, characterized in that: The bottom of the inner wall of the protective cover (701) is fixedly connected to a first motor (7). The top output shaft of the first motor (7) extends to the inside of the processing table (1) and is fixedly connected to the inner wall of the bevel ring (8). The four lead screws (11) are rotatably connected to mounting blocks (10) on the surface of one end near the driven bevel gear (9). The bottom of the four mounting blocks (10) is fixedly connected to the bottom of the inner wall of the processing table (1).

4. The drilling device for processing metal filing cabinets as described in claim 3, characterized in that: The top of the four lead screw sleeves (12) is fixedly connected to the bottom of the four connecting rods (14), and the end of the four lead screws (11) away from the four mounting blocks (10) is rotatably connected to the inner wall of the processing table (1). A guide rod (13) is fixedly connected between the four mounting blocks (10) and the inner wall of the processing table (1), and the four guide rods (13) are slidably connected to the four lead screw sleeves (12).

5. The drilling device for processing metal filing cabinets as described in claim 1, characterized in that: Each of the four clamping shells (6) has a horizontally arranged bidirectional threaded rod (15) rotatably connected to its internal center. A worm gear (16) is fixedly sleeved on the center of the surface of the bidirectional threaded rod (15). A worm (17) is meshed with the top of each of the four worm gears (16). A rectangular cover (18) is fixedly connected to each of the four clamping shells (6) on the side away from each other.

6. The drilling device for processing metal filing cabinets as described in claim 5, characterized in that: The rectangular cover (18) is equipped with a second motor (19) at the top inside. The second motor (19) is fixedly installed on one side of the clamping shell (6). The output shaft of the second motor (19) is fixedly connected to one end of the worm gear (17). The left and right sides of the surface of the bidirectional threaded rod (15) are threaded with threaded sleeves (20). The two threaded sleeves (20) extend to the outside of the clamping shell (6) at one end away from each other and slide to them. The four clamping shells (6) are fixedly connected at the bottom inside with horizontally arranged limiting rods (21).

7. The drilling device for processing metal filing cabinets as described in claim 6, characterized in that: The limiting rod (21) is slidably connected to the threaded sleeve (20). Both threaded sleeves (20) are fixedly connected to a rectangular shell (22) at one end outside the clamping shell (6). An air pump (27) is provided inside the rectangular cover (18). The air pump (27) is fixedly connected to one side of the clamping shell (6). The air pump (27) extends to the outside of the rectangular cover (18) and is fixedly connected thereto. An airbag (23) is provided inside the rectangular shell (22). Each airbag (23) is slidably connected to a plurality of equally spaced abutment rods (24) on one side close to each other.

8. The drilling device for processing metal filing cabinets as described in claim 7, characterized in that: Multiple abutment rods (24) pass through the airbag (23) at one end away from the airbag (23) and extend to the outside of the rectangular shell (22). Multiple sealing rings (25) are fixedly connected between each rectangular shell (22) and the airbag (23). The surface of the abutment rod (24) is slidably connected to the inner wall of the sealing ring (25). U-shaped corrugated tubes (26) are fixedly connected between the two airbags (23) located on the left and right sides of the same clamping shell (6). The U-shaped corrugated tubes (26) extend to the outside of the rectangular shell (22) and are slidably connected to it. A connecting pipe (28) is fixedly connected to the air outlet end of the air pump (27). The connecting pipe (28) extends to the outside of the rectangular cover (18) at one end away from the air pump (27) and is fixedly connected to one side of the U-shaped corrugated tube (26).

Images