Electric clothes airing machine capable of automatically dispersing and collecting clothes

Abstract

The utility model discloses an electric clothes airing machine capable of automatically dispersing and folding clothes, which comprises a main machine and a liftable airing rod, and a motor is arranged at the end part of the main machine; a main gear is arranged at the head end part of the airing rod; driven gears are arranged at the tail parts of the airing rods; a linear sliding groove extending in the length direction of the airing rod and an annular groove surrounding the linear sliding groove are formed in the airing rod, and a plurality of hanging rings are arranged in the linear sliding groove; a belt is arranged in the annular groove and connected to the driving gear and the driven gear. The first hanging ring is fixed in the linear sliding groove of the airing rod; the adjacent hanging rings are connected through flexible wires, and finally the hanging rings are connected with the belt. A clutch is arranged between the main machine and the head end of the airing rod, the motor drives the main gear and the belt to reciprocate back and forth through the clutch, the final hanging rings can be driven to reciprocate in the linear sliding groove, and then all the hanging rings are driven to be scattered on the airing rod and folded together. According to the utility model, clothes are automatically dispersed and collected, and the clothes airing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to an electric clothes drying rack, and more particularly to an electric clothes drying rack that can automatically disperse and gather clothes; during drying, clothes can be automatically dispersed on the drying rod; when drying is complete, clothes can be gathered together on the drying rod for easy collection. Background Technology

[0002] Currently, both traditional clotheslines and those on clothes drying machines have multiple fixed hanging holes on the rod, spaced apart and in fixed positions. When drying clothes, each garment is hung on its corresponding hole via a clothes rack. Once the clothes are dry, taking them down is relatively inconvenient.

[0003] To address the aforementioned issues, a clothes drying rack assembly (publication number CN208586438U) includes a drying rod, connecting ropes, and several hanging hole assemblies. These hanging hole assemblies are distributed along the length of the track, and adjacent assemblies are connected by the connecting ropes. This movable assembly of hanging holes allows for flexible hanging of clothing, not only meeting the need for convenient clothes collection but also enabling dispersed drying.

[0004] The clothes drying assembly and system of CN212834640U allows users to slide the drying assembly as needed to make adjacent sliding parts unfold or come together in conjunction. When adjacent sliding parts come together, the flexible connecting rope that has been folded can be gathered in the storage cavity, so that the various drying assemblies are more tightly packed together.

[0005] The existing hanging hole assembly still requires manual operation to gather and disperse, which is relatively troublesome. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an electric clothes drying machine that can automatically disperse and gather clothes, thereby improving the efficiency of drying clothes.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an electric clothes drying machine that can automatically disperse and gather clothes, including a main unit and a height-adjustable drying rod, wherein the end of the main unit is provided with an upper coupling driven by a motor.

[0008] The first end of the drying rod is provided with a lower coupling and a main gear, and the main gear is coaxially located on the lower side of the lower coupling;

[0009] The tail end of the drying rod is equipped with a driven gear;

[0010] The drying rod is provided with a straight groove extending along the length of the drying rod and an annular groove surrounding the straight groove. Multiple hanging rings are provided in the straight groove; a belt is provided in the annular groove, and the belt is connected to the main gear and the driven gear.

[0011] The first hanging ring is fixed in the straight groove of the drying rod; adjacent hanging rings are connected by a soft wire, and the last hanging ring is connected to the belt;

[0012] The lower end face of the upper coupling is provided with a first tooth, and the upper end face of the lower coupling is provided with a second tooth;

[0013] When the drying rack is raised to its upper limit, the first tooth of the upper coupling and the second tooth of the lower coupling mesh. The motor drives the upper and lower couplings and drives the belt to move back and forth, which can drive the last hanging ring to move back and forth in the linear slide groove, thereby causing all the hanging rings to disperse and retract on the drying rack.

[0014] A further preferred embodiment of this utility model is as follows: the annular groove includes arc-shaped grooves located at both ends of the drying rod and a straight belt groove located outside the straight slide groove; a partition is provided between the straight belt groove and the straight slide groove, and a through groove is provided in the middle of the partition;

[0015] The annular belt is connected to the last hanging ring through a transverse connecting part. When the annular belt slides, the transverse connecting part can slide along the groove.

[0016] A further preferred embodiment of this utility model is as follows: the hanging ring is a slider with a movable wheel installed, the upper end surface of the slider is higher than the upper surface of the drying rod, and the upper end surface of the slider is a concave arc surface.

[0017] A further preferred embodiment of this invention is that the motor is driven by the upper coupling via a gear set.

[0018] A further preferred embodiment of this utility model is as follows: the lower coupling is located at the bottom of the cylindrical part, and when the upper coupling is connected to the lower coupling, the peripheral wall of the upper coupling enters the concave cavity of the cylindrical part.

[0019] Another subject: an electric clothes drying rack that can automatically disperse and gather clothes, including a main unit and a height-adjustable drying rod, wherein a motor is provided at the end of the main unit;

[0020] The drying rod has a main gear at its head end and a driven gear at its tail end.

[0021] The drying rod is provided with a straight groove extending along the length of the drying rod and an annular groove surrounding the straight groove. Multiple hanging rings are provided in the straight groove; a belt is provided in the annular groove, and the belt is connected to the main gear and the driven gear; the first hanging ring is fixed in the straight groove of the drying rod; adjacent hanging rings are connected by a flexible wire, and the last hanging ring is connected to the belt.

[0022] A clutch is provided between the main unit and the first end of the drying rod. The motor drives the main gear and belt to reciprocate through the clutch, which can drive the last hanging ring to move back and forth in the linear slide groove, thereby causing all the hanging rings to disperse and retract on the drying rod.

[0023] A further preferred embodiment of this utility model is: the clutch includes an upper coupling located on the main unit and a lower coupling located on the drying rod;

[0024] The motor drives the upper coupling through a gear set, and the lower coupling is coaxially provided with the upper side of the main gear;

[0025] The lower end face of the upper coupling is provided with a first tooth, and the upper end face of the lower coupling is provided with a second tooth that can mesh with the first tooth.

[0026] A further preferred embodiment of this utility model is as follows: the annular groove includes arc-shaped grooves located at both ends of the drying rod and a straight belt groove located outside the straight slide groove; a partition is provided between the straight belt groove and the straight slide groove, and a through groove is provided in the middle of the partition;

[0027] The annular belt is connected to the last hanging ring through a transverse connecting part. When the annular belt slides, the transverse connecting part can slide along the groove.

[0028] A further preferred embodiment of this utility model is as follows: the hanging ring is a slider with a movable wheel installed, the upper end surface of the slider is higher than the upper surface of the drying rod, and the upper end surface of the slider is a concave arc surface.

[0029] A further preferred embodiment of this utility model is as follows: the lower coupling is located at the bottom of the cylindrical part, and when the upper coupling is connected to the lower coupling, the peripheral wall of the upper coupling enters the concave cavity of the cylindrical part.

[0030] Compared with existing technologies, the advantages of this invention are: its automatic dispersing and gathering functions greatly improve drying efficiency, reduce the tedium of manual operation, and make the drying process faster and more convenient. Secondly, the motor-driven clutch system enables precise control of the hanging rings on the clothesline, ensuring even distribution of clothing and optimizing space utilization. Furthermore, the linear and annular groove designs on the clothesline, combined with belt drive, allow the hanging rings to move smoothly on the clothesline, reducing operating noise and extending the machine's lifespan. Finally, this design is highly adaptable, suitable for clothing of different lengths and weights, meeting diverse drying needs. Overall, this patent provides an efficient, convenient, quiet, and durable electric clothes drying solution. Attached Figure Description

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0032] Figure 1 This is a schematic diagram of the structure of the drying rack in the lowered state. Figure 1 ;

[0033] Figure 2 This is a schematic diagram of the structure of the drying rack in the lowered state. Figure 2 ;

[0034] Figure 3 This is a schematic diagram of the end face structure of the drying rod in the raised state of this utility model;

[0035] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0036] Figure 5 This is a cross-sectional view of the drying rod in this utility model on a horizontal plane;

[0037] Figure 6 This is a cross-sectional view of the linear groove in this utility model on a vertical plane;

[0038] Figure 7 This is a schematic diagram of the structure of multiple hanging rings dispersed in this utility model.

[0039] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Main unit; 2. Drying rod; 3. Upper coupling; 4. Lower coupling; 5. Main gear; 7. Straight groove; 9. Hanging ring; 10. Belt; 11. Flexible wire; 12. First tooth; 13. Second tooth; 14. Arc groove; 15. Straight belt groove; 16. Partition; 17. Through groove; 18. Lateral connection part; 19. Moving wheel; 20. Slider; 21. Gear set; 22. Cylindrical part. Detailed Implementation

[0040] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0041] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0042] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0043] An electric clothes drying rack that automatically disperses and gathers clothes, as described in Embodiment 1. Figures 1 to 4 As shown, the device includes a main unit 1 and a height-adjustable drying rod 2. The main unit 1 has an upper coupling 3 driven by a motor at its end; the motor is driven by the upper coupling 3 through a gear set 21. The drying rod 2 has a lower coupling 4 and a main gear 5 at its front end, with the main gear 5 coaxially positioned below the lower coupling 4; the drying rod 2 has a driven gear at its rear end. In this invention, no power device is installed inside the drying rod 2. The motor is concentrated on the main unit 1, with the upper coupling 3, and the lower coupling 4 is correspondingly installed on the drying rod 2. When the upper coupling 3 and the lower coupling 4 mesh, the motor drives the lower coupling 4 on the drying rod 2 to rotate, which in turn drives the main gear 5 to rotate.

[0044] The lower coupling 4 is located at the bottom of the cylindrical portion 22. When the upper coupling 3 mates with the lower coupling 4, the peripheral wall of the upper coupling 3 enters the cavity of the cylindrical portion 22. The cavity design of the cylindrical portion 22 effectively guides the upper coupling 3 and the lower coupling 4 to accurately mate, ensuring the alignment of the axes of the upper and lower couplings 4 and avoiding eccentricity and runout. Furthermore, the peripheral wall of the upper coupling 3 entering the cavity of the cylindrical portion 22 provides radial support, increasing the rigidity and stability of the connection and reducing vibration during operation.

[0045] like Figures 5 to 7As shown, the drying rod 2 is provided with a straight groove 7 extending along the length of the drying rod 2 and an annular groove surrounding the straight groove 7. The annular groove includes arc-shaped grooves 14 located at both ends of the drying rod 2 and a straight belt groove 15 located outside the straight groove 7. This invention achieves the installation and limiting of the belt 10 by setting the annular groove, ensuring that the belt 10 can move along a predetermined trajectory. The straight groove 7 achieves the installation and limiting of the hanging ring 9, ensuring that the hanging ring 9 can move along the length of the drying rod 2 and avoid swaying. A partition 16 is provided between the straight belt groove 15 and the straight groove 7, and a through groove 17 is provided in the middle of the partition 16. The partition 16 separates the straight belt groove 15 and the straight groove 7, preventing the belt 10 and the hanging ring 9 from interfering with each other. In this invention, the belt 10 only needs to drive the last hanging ring 9 to slide to achieve the unfolding or retraction of all hanging rings 9. Therefore, a groove 17 is opened on the partition 16, and a transverse connecting part 18 is set to connect the belt 10 to the last hanging ring 9, so as to realize the driving of multiple hanging rings 9.

[0046] Multiple hanging rings 9 are provided in the linear groove 7. The first hanging ring 9 is fixed in the linear groove 7 of the drying rod 2. Adjacent hanging rings 9 are connected by a flexible wire 11, and the last hanging ring 9 is connected to the belt 10. A linear groove 7 extending along the length of the drying rod 2 is planned on the drying rod 2 to install multiple hanging rings 9. An annular groove surrounding the linear groove 7 is planned to install the belt 10. The rotation of the main gear 5 drives the belt 10 and the driven gear to rotate. The movement of the belt 10 drives the opening and closing of the hanging rings 9. The hanging ring 9 is a slider 20 with a movable wheel 19 installed. The upper end surface of the slider 20 is higher than the upper surface of the drying rod 2, and the upper end surface of the slider 20 is a concave arc surface. This utility model sets the hanging ring 9 with a movable wheel 19, which can effectively reduce the frictional resistance when the hanging ring 9 moves, so that the hanging ring 9 moves smoothly. Whether the user pushes and pulls manually or it is driven by a motor, the hanging ring 9 can be easily moved.

[0047] A belt 10 is installed within the annular groove, and the belt 10 is connected to the main gear 5 and the driven gear. The annular belt 10 is connected to the last hanging ring 9 via a transverse connecting part 18. When the annular belt 10 slides, the transverse connecting part 18 can slide along the through groove 17. When the drying rod 2 is raised to its upper limit, there is a gap between the hanging ring 9 and the main unit 1, which can accommodate the hanging of the clothes hanger. Specifically, the upper surface of the slider 20 can be a wave-shaped structure, including crests and troughs. When the clothes hanger is suspended on the upper surface of the slider 20, the clothes hanger will naturally fall to the trough and be limited by the crests on both sides.

[0048] like Figures 1 to 4As shown, the lower end face of the upper coupling 3 is provided with a first tooth 12, and the upper end face of the lower coupling 4 is provided with a second tooth 13. When the drying rod 2 is raised to the upper limit, the first tooth 12 of the upper coupling 3 and the second tooth 13 of the lower coupling 4 mesh, and the motor drives the upper and lower couplings 4 and drives the belt 10 to reciprocate, which can drive the last hanging ring 9 to move back and forth in the linear slide groove 7, thereby driving all the hanging rings 9 to disperse and retract on the drying rod 2. In this utility model, no power device is installed inside the drying rod 2. In this utility model, the motor is concentrated on the main unit 1, and the upper coupling 3 is set, and then the lower coupling 4 is correspondingly set on the drying rod 2. When the upper coupling 3 and the lower coupling 4 mesh, the motor drives the lower coupling 4 on the drying rod 2 to rotate, and the lower coupling 4 drives the main gear 5 to rotate.

[0049] An electric clothes drying rack that automatically disperses and gathers clothes, as described in Embodiment 2. Figures 1 to 4 As shown, the device includes a main unit 1 and a height-adjustable drying rod 2. A motor is located at one end of the main unit 1. A clutch is provided between the main unit 1 and the first end of the drying rod 2. A main gear 5 is located at the first end of the drying rod 2, and a driven gear is located at the tail end of the drying rod 2. In this invention, no power device is installed inside the drying rod 2. The motor is integrated into the main unit 1, and a clutch is provided between the main unit 1 and the first end of the drying rod 2. The motor drives the main gear 5 to rotate through the clutch.

[0050] like Figures 5 to 7 As shown, the drying rod 2 is provided with a straight groove 7 extending along the length of the drying rod 2 and an annular groove surrounding the straight groove 7. The annular groove includes arc-shaped grooves 14 located at both ends of the drying rod 2 and a straight belt groove 15 located outside the straight groove 7. This invention achieves the installation and limiting of the belt 10 by setting the annular groove, ensuring that the belt 10 can move along a predetermined trajectory. The straight groove 7 achieves the installation and limiting of the hanging ring 9, ensuring that the hanging ring 9 can move along the length of the drying rod 2 and avoid swaying. A partition 16 is provided between the straight belt groove 15 and the straight groove 7, and a through groove 17 is provided in the middle of the partition 16. The partition 16 separates the straight belt groove 15 and the straight groove 7, preventing the belt 10 and the hanging ring 9 from interfering with each other. In this invention, the belt 10 only needs to drive the last hanging ring 9 to slide to achieve the unfolding or retraction of all hanging rings 9. Therefore, a groove 17 is opened on the partition 16, and a transverse connecting part 18 is set to connect the belt 10 to the last hanging ring 9, so as to realize the driving of multiple hanging rings 9.

[0051] The linear groove 7 is provided with multiple hanging rings 9; each hanging ring 9 is a slider 20 equipped with a movable wheel 19. The upper end surface of the slider 20 is higher than the upper surface of the drying rod 2, and the upper end surface of the slider 20 is a concave arc surface. This invention features movable wheels 19 on the hanging rings 9, which effectively reduce the frictional resistance when the hanging rings 9 move, making their movement smooth. Whether manually pushed or pulled by the user or driven by a motor, the hanging rings 9 can be easily moved.

[0052] A belt 10 is installed within the annular groove, and the belt 10 is connected to the main gear 5 and the driven gear. The first hanging ring 9 is fixed within the straight groove 7 of the drying rod 2. Adjacent hanging rings 9 are connected by a flexible wire 11, and the last hanging ring 9 is connected to the belt 10. The annular belt 10 is connected to the last hanging ring 9 through a transverse connecting part 18. When the annular belt 10 slides, the transverse connecting part 18 can slide along the through groove 17. A straight groove 7 extending along the length of the drying rod 2 is planned on the drying rod 2 to install multiple hanging rings 9, and an annular groove surrounding the straight groove 7 is planned to install the belt 10. The rotation of the main gear 5 drives the belt 10 and the driven gear to rotate. The movement of the belt 10 drives the opening and closing of the hanging rings 9.

[0053] like Figures 1 to 5 As shown, the motor drives the main gear 5 and belt 10 back and forth through the clutch, which can drive the last hanging ring 9 to move back and forth in the linear slide groove 7, thereby causing all the hanging rings 9 to disperse and retract on the drying rod 2.

[0054] The clutch includes an upper coupling 3 located on the main unit 1 and a lower coupling 4 located on the drying rod 2; the motor drives the upper coupling 3 through a gear set 21, and the lower coupling 4 is coaxially provided on the upper side of the main gear 5. The lower coupling 4 is located at the bottom of the cylindrical part 22. When the upper coupling 3 and the lower coupling 4 are connected, the peripheral wall of the upper coupling 3 enters the cavity of the cylindrical part 22.

[0055] The lower end face of the upper coupling 3 is provided with a first tooth 12, and the upper end face of the lower coupling 4 is provided with a second tooth 13 that can mesh with the first tooth 12.

[0056] This invention integrates the motor onto the main unit 1 and includes an upper coupling 3, while a lower coupling 4 is correspondingly mounted on the drying rod 2. When the upper coupling 3 and lower coupling 4 engage, the motor drives the lower coupling 4 on the drying rod 2 to rotate, which in turn drives the main gear 5. When the drying rod 2 moves away from its upper limit position, the lower coupling 4 loses its force and enters a free state, allowing the lower gear to rotate freely. In other words, after the drying rod 2 descends, the user can manually pull the hanging ring 9 on the drying rod 2, thus facilitating user operation and adapting to user habits.

[0057] This invention introduces an electric clothes drying rack that automatically disperses and gathers clothing. Specific examples are used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments are merely for the purpose of helping to understand this invention and its core concepts. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An electric clothes drying rack that automatically disperses and gathers clothes, characterized in that: It includes a main unit and a height-adjustable drying rack, with an upper coupling driven by a motor at the end of the main unit; The first end of the drying rod is provided with a lower coupling and a main gear, and the main gear is coaxially located on the lower side of the lower coupling; The tail end of the drying rod is equipped with a driven gear; The drying rod is provided with a straight groove extending along the length of the drying rod and an annular groove surrounding the straight groove. Multiple hanging rings are provided in the straight groove; a belt is provided in the annular groove, and the belt is connected to the main gear and the driven gear. The first hanging ring is fixed in the straight groove of the drying rod; adjacent hanging rings are connected by a soft wire, and the last hanging ring is connected to the belt; The lower end face of the upper coupling is provided with a first tooth, and the upper end face of the lower coupling is provided with a second tooth; When the drying rack is raised to its upper limit, the first tooth of the upper coupling and the second tooth of the lower coupling mesh. The motor drives the upper and lower couplings and drives the belt to move back and forth, which can drive the last hanging ring to move back and forth in the linear slide groove, thereby causing all the hanging rings to disperse and retract on the drying rack.

2. The electric clothes drying rack with automatic clothes dispersion and gathering as described in claim 1, characterized in that: The annular groove includes arc-shaped grooves at both ends of the drying rod and a straight belt groove located outside the straight slide groove; a partition is provided between the straight belt groove and the straight slide groove, and a through groove is provided in the middle of the partition; The annular belt is connected to the last hanging ring through a transverse connecting part. When the annular belt slides, the transverse connecting part can slide along the groove.

3. The electric clothes drying rack with automatic clothes dispersion and gathering as described in claim 1, characterized in that: The hanging ring is a slider with a movable wheel installed. The upper end surface of the slider is higher than the upper surface of the drying rod, and the upper end surface of the slider is a concave arc surface.

4. The electric clothes drying rack with automatic clothes dispersion and gathering as described in claim 1, characterized in that: The motor is driven by the upper coupling via a gear set.

5. The electric clothes drying rack with automatic dispersing and gathering of clothing according to claim 1, characterized in that: The lower coupling is located at the bottom of the cylindrical part. When the upper coupling is connected to the lower coupling, the peripheral wall of the upper coupling enters the concave cavity of the cylindrical part.

6. An electric clothes drying rack that automatically disperses and gathers clothes, characterized in that: It includes a main unit and a height-adjustable drying rack, with a motor at the end of the main unit; The drying rod has a main gear at its head end and a driven gear at its tail end. The drying rod is provided with a straight groove extending along the length of the drying rod and an annular groove surrounding the straight groove. Multiple hanging rings are provided in the straight groove; a belt is provided in the annular groove, and the belt is connected to the main gear and the driven gear; the first hanging ring is fixed in the straight groove of the drying rod; adjacent hanging rings are connected by a flexible wire, and the last hanging ring is connected to the belt. A clutch is provided between the main unit and the first end of the drying rod. The motor drives the main gear and belt to reciprocate through the clutch, which can drive the last hanging ring to move back and forth in the linear slide groove, thereby causing all the hanging rings to disperse and retract on the drying rod.

7. An electric clothes drying rack with automatic clothes dispersion and collection as described in claim 6, characterized in that: The clutch includes an upper coupling located on the main unit and a lower coupling located on the drying bar; The motor drives the upper coupling through a gear set, and the lower coupling is coaxially provided with the upper side of the main gear; The lower end face of the upper coupling is provided with a first tooth, and the upper end face of the lower coupling is provided with a second tooth that can mesh with the first tooth.

8. An electric clothes drying rack with automatic dispersing and gathering of clothing according to claim 6, characterized in that: The annular groove includes arc-shaped grooves at both ends of the drying rod and a straight belt groove located outside the straight slide groove; a partition is provided between the straight belt groove and the straight slide groove, and a through groove is provided in the middle of the partition; The annular belt is connected to the last hanging ring through a transverse connecting part. When the annular belt slides, the transverse connecting part can slide along the groove.

9. An electric clothes drying rack with automatic clothes dispersion and collection as described in claim 6, characterized in that: The hanging ring is a slider with a movable wheel installed. The upper end surface of the slider is higher than the upper surface of the drying rod, and the upper end surface of the slider is a concave arc surface.

10. An electric clothes drying rack with automatic dispersing and gathering of clothing according to claim 7, characterized in that: The lower coupling is located at the bottom of the cylindrical part. When the upper coupling is connected to the lower coupling, the peripheral wall of the upper coupling enters the concave cavity of the cylindrical part.

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