Pipeline connecting structure for cleaning machine and cleaning machine

Abstract

The utility model belongs to the technical field of cleaning electric appliances, and discloses a pipeline connecting structure for a cleaning machine and the cleaning machine, the pipeline connecting structure comprises a pipeline assembly and a locking assembly, the pipeline assembly comprises a first connecting pipe and a second connecting pipe which are mutually inserted and connected, and the locking assembly comprises a guide rail. The guide rail comprises a first gear part and a second gear part which have a depth difference, and one of the first connecting pipe and the second connecting pipe can alternately slide in a pressed state, so that the first connecting pipe is alternately located in the first gear part and the second gear part; therefore, the first connecting pipe is restrained to the second connecting pipe or is separated from the second connecting pipe. According to the pipeline connecting structure, unlocking and locking of the locking assembly are achieved through sequential pressing, operation is convenient, the cleaning machine is made to have both unlocking convenience and locking reliability, and the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a pipeline connection structure for a cleaning machine and the cleaning machine. Background Art

[0002] A dishwasher is a household appliance that uses a washing pump to pressurize cleaning water and transports it to the spray arm through the inner water channel. The cleaning water is sprayed through the spray holes on the spray arm to impact the surface of the tableware, thereby achieving the purpose of cleaning the tableware. The jet water pressure at the spray hole largely determines the cleaning performance of the dishwasher.

[0003] Dishwashers with multiple spray arms typically have a lower spray arm at the bottom of the inner tank and an upper spray arm on the cutlery rack. The cutlery rack requires frequent pushing and pulling to place and retrieve cutlery. Therefore, the water pipe of the upper spray arm is separate from the inner tank waterway. When the cutlery rack is pushed into the inner tank, the water pipe of the upper spray arm is connected to the inner tank waterway. When the dishwasher is in operation, the water pressure in the waterway is high. The impact of the water pressure causes the cutlery rack to shake, which can easily cause the seal at the connection between the water pipe and the inner tank waterway to fail. Therefore, some dishwashers use a rotating lock mechanism to strengthen the connection between the water pipe and the inner tank waterway. When the cutlery rack needs to be pulled out, the lock must first be rotated to unlock it from the lock slot. After pushing the cutlery rack into the inner tank, the lock must be rotated again to lock the water pipe and the inner tank waterway. This locking mechanism is inconvenient to use, and the unlocking and locking operations are cumbersome, affecting the user experience. Utility Model Content

[0004] The first purpose of the present invention is to provide a pipe connection structure, which can solve the problems of the existing dishwasher's rotating lock structure being inconvenient to use, and the troublesome unlocking and locking operations affecting the user experience.

[0005] To achieve this purpose, the present invention first adopts the following technical solutions:

[0006] On the one hand, a pipeline connection structure is provided, including a pipeline assembly and a locking assembly, the pipeline assembly including a first connecting pipe and a second connecting pipe that are plugged into each other, the locking assembly including a guide rail, the guide rail including a first gear portion and a second gear portion with a depth difference, one of the first connecting pipe and the second connecting pipe can slide alternately under pressure, so that the first connecting pipe is alternately in the first gear portion and the second gear portion, thereby constraining the first connecting pipe to the second connecting pipe or releasing it from the constraint.

[0007] As an optional structure of the present invention, the guide track is a closed track, the first connecting tube moves unidirectionally along the closed track, and the guide track has a plurality of stop parts arranged at intervals along the extension direction. Two adjacent stop parts respectively form the first gear part and the second gear part, and the first gear part and the second gear part are arranged in sequence.

[0008] As an optional structure of the present invention, the locking assembly includes a first side plate and a second side plate arranged opposite to each other, the first side plate is provided with a limiting groove, and the second side plate is provided with a limiting protrusion on the side facing the limiting groove, the limiting protrusion is located in the limiting groove, the limiting protrusion and the edge of the limiting groove are jointly arranged to form the guide rail, and a bending angle is provided along the extension direction of the limiting protrusion and / or the extension direction of the edge to form the stop portion.

[0009] As an optional structure of the present invention, the locking assembly also includes an elastic member, which is used to apply an elastic force opposite to the pressure direction to one of the first connecting tube and the second connecting tube, and the elastic force always has a movement tendency to keep the first connecting tube constrained to the first gear portion or to keep it constrained to the second gear portion.

[0010] As an optional structure of the present invention, the locking assembly also includes a first locking member arranged on the first connecting tube and a second locking member arranged on the second connecting tube. When the first connecting tube is in the first gear portion, the first locking member and the second locking member are locked to each other. When the first connecting tube is in the second gear portion, the first locking member and the second locking member are disengaged from each other.

[0011] As an optional structure of the present invention, the first locking member is a clamping buckle, and the second locking member includes at least two oppositely arranged claws. The first locking member and the second locking member can slide along the guide rail simultaneously with the first connecting tube, and the second locking member is alternately in a retracted state and an open state. The first locking member can clamp the second locking member in the retracted state, or be detached from the second locking member in the open state.

[0012] As an optional structure of the present invention, the locking assembly also includes a limiting shell arranged on the second connecting tube, the limiting shell has a movable cavity and one end of the limiting shell has an opening to connect the movable cavity, the guide rail is arranged in the movable cavity, the second locking member can be movably constrained in the limiting shell and at least part of the clamp is located outside the limiting shell.

[0013] As an optional structure of the present invention, the clamping jaws are made of elastic material. When the first connecting tube is in the second gear portion, the multiple clamping jaws move away from each other to form an open state; when the first connecting tube is in the first gear portion, the clamping jaws are elastically deformed and form a retracted state.

[0014] As an optional structure of the present invention, the second locking member also includes a guide shaft, one end of which is hinged to the clamping jaw, and the other end can be movably constrained to the guide rail; the first locking member is located in the cavity formed by at least two of the clamping jaws and pushes against the second locking member to make the guide shaft move along the guide rail.

[0015] The second object of the present invention is to provide a washing machine having the above-mentioned pipe connection structure which can solve the problem that the rotating lock structure of some dishwashers is inconvenient to use, and the unlocking and locking operations are troublesome, which affects the user experience.

[0016] To achieve this purpose, the present invention adopts the following technical solutions on the other hand:

[0017] Next, a cleaning machine is provided, comprising the above-mentioned pipeline connection structure.

[0018] Beneficial effects of the utility model:

[0019] The pipe connection structure provided by the present invention includes a pipe assembly and a locking assembly. The pipe assembly includes a first connecting pipe and a second connecting pipe that can be plugged into and connected to each other. The locking assembly includes a guide rail. The guide rail includes a first gear portion and a second gear portion with a depth difference. When one of the first connecting pipe and the second connecting pipe is under pressure, the first connecting pipe and the second connecting pipe can slide alternately, so that the first connecting pipe is alternately located in the first gear portion and the second gear portion, thereby constraining the first connecting pipe to the second connecting pipe or releasing the constraint from the second connecting pipe. Due to the depth difference between the first gear portion and the second gear portion, when the first connecting pipe is in the second gear portion, the locking assembly is unlocked, and the first connecting pipe and the second connecting pipe can be released from the plugged state, facilitating the separation of the shelf from the inner container; when the first connecting pipe is in the first gear portion, the locking assembly is locked, which can prevent the first connecting pipe and the second connecting pipe from separating due to water impact pressure, thereby ensuring connection reliability. When one of the first and second connecting tubes is under pressure, the first connecting tube can be pressed axially. This compresses the first connecting tube, causing one of the first and second connecting tubes to alternately slide under pressure, thereby enabling the locking assembly to switch between the first and second gears. This sequential pressing allows for unlocking and locking of the locking assembly, making it easy to operate. This allows the pipe connection structure to achieve both unlocking convenience and locking reliability, enhancing user experience.

[0020] The cleaning machine provided by the present invention has the aforementioned pipe connection structure. By pressing the first connecting pipe in the axial direction, one of the first connecting pipe and the second connecting pipe is put into a compressed state, thereby achieving alternating sliding of the first connecting pipe and the second connecting pipe, so that the locking assembly can switch between the first gear portion and the second gear portion. The locking assembly is unlocked and locked by pressing in sequence, which is easy to operate. The pipe connection structure combines unlocking convenience with locking reliability, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural cross-sectional view of the pipeline connection structure provided by an embodiment of the present utility model when the first connecting pipe is in the first gear position;

[0022] Figure 2 This is a structural cross-sectional view of the pipeline connection structure provided by an embodiment of the present utility model when the first connecting pipe is in the second gear position;

[0023] Figure 3 This is a schematic diagram of the principle of the guide rail forming the gear portion provided by the embodiment of the utility model;

[0024] Figure 4 This is a structural diagram of the locking assembly provided by an embodiment of the present utility model in the second gear position;

[0025] Figure 5 This is a structural diagram of the locking assembly provided by an embodiment of the present utility model in the first gear portion;

[0026] Figure 6 It is a schematic diagram of the structural disassembly of the locking assembly provided by an embodiment of the present utility model.

[0027] In the picture:

[0028] 1. Pipeline assembly; 11. First connecting pipe; 12. Second connecting pipe; 13. Sealing element;

[0029] 2. Locking assembly; 21. First locking member; 22. Second locking member; 221. Clamping claw; 222. Guide shaft; 2221. Slider; 23. Elastic member; 24. Guide rail; 241. First gear portion; 242. Second gear portion; 243. Stop portion; 25. Limiting shell; 251. Movable cavity; 252. First side plate; 2521. Limiting groove; 253. Second side plate; 2531. Limiting protrusion. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] like Figure 1 and Figure 2 As shown, the pipe connection structure includes a pipe assembly 1 and a locking assembly 2. The pipe assembly 1 includes a first connecting pipe 11 and a second connecting pipe 12 that can be plugged into each other. The second connecting pipe 12 is installed in the inner tank and serves as the water supply pipe for the cleaning machine to provide cleaning water. The first connecting pipe 11 is installed on the shelf and is used to connect to the spray arm of the cleaning machine (not shown in the figure). The cleaning water enters the first connecting pipe 11 through the second connecting pipe 12 and ultimately flows into the spray arm, and is sprayed out through the spray holes on the spray arm. Cleaning machines include but are not limited to dishwashers used for washing dishes, and also include other cleaning machines that provide cleaning water by spraying.

[0035] The first connecting tube 11 and the second connecting tube 12 are plug-connected to each other. The locking assembly 2 includes a guide rail 24, which includes a first stop portion 241 and a second stop portion 242 with a depth difference. When one of the first connecting tube 11 and the second connecting tube 12 is under pressure, the guide rail 24 can slide alternately, so that the first connecting tube 11 is alternately positioned within the first stop portion 241 and the second stop portion 242, thereby constraining the first connecting tube 11 to the second connecting tube 12 or releasing it from the second connecting tube 12. Due to the depth difference between the first stop portion 241 and the second stop portion 242, when the first connecting tube 11 is in the second stop portion 242, the locking assembly 2 is unlocked, allowing the first and second connecting tubes 11 and 12 to be disengaged, facilitating the separation of the shelf from the inner container. When the first connecting tube 11 is in the first stop portion 241, the locking assembly 2 is locked, preventing the first and second connecting tubes 11 and 12 from separating due to water pressure, thereby ensuring connection reliability. When one of the first connecting tube 11 and the second connecting tube 12 is under pressure, the first connecting tube 11 can be pressed axially to press the first connecting tube 11. This causes the first connecting tube 11 and the second connecting tube 12 to alternately slide while under pressure, thereby enabling the locking assembly 2 to switch between the first gear portion 241 and the second gear portion 242. The locking assembly 2 is unlocked and locked by sequentially pressing, making it easy to operate. This allows the pipeline connection structure to achieve both unlocking convenience and locking reliability, improving user experience.

[0036] It should be noted that there are two ways to connect the first connecting tube 11 and the second connecting tube 12 . One is that the first connecting tube 11 is inserted into the second connecting tube 12 , and the other is that the first connecting tube 11 is sleeved outside the second connecting tube 12 . Figure 1 The figure shows a connection method in which the first connecting pipe 11 is sleeved on the outside of the second connecting pipe 12. In order to improve the sealing performance of the connection, the pipeline structure also includes an annular seal 13. The seal 13 is provided between the first connecting pipe 11 and the second connecting pipe 12 to seal the gap between the first connecting pipe 11 and the second connecting pipe 12, thereby further reducing water leakage in the gap between the first connecting pipe 11 and the second connecting pipe 12.

[0037] The guide track 24 is a closed track, and the first connecting tube 11 moves unidirectionally along the closed track. The guide track 24 has a plurality of stop parts 243 arranged at intervals along the extension direction. Two adjacent stop parts 243 respectively form a first gear part 241 and a second gear part 242. The first gear part 241 and the second gear part 242 are arranged in sequence. During the process of the first connecting tube 11 moving unidirectionally along the closed track, it passes through the first gear part 241 and the second gear part 242 in sequence and circulates.

[0038] To form the guide track 24, the locking assembly 2 includes a first side plate 252 and a second side plate 253 disposed opposite each other. The first side plate 252 defines a limiting groove 2521, and the second side plate 253 is provided with a limiting protrusion 2531 on a side facing the limiting groove 2521. The limiting protrusion 2531 is located within the limiting groove 2521. The limiting protrusion 2531 and the edge of the limiting groove 2521 together form the guide track 24. Bend angles are provided along the extending direction of the limiting protrusion 2531 and / or the extending direction of the edge to form a plurality of stoppers 243.

[0039] The locking assembly 2 also includes an elastic member 23, which is used to apply an elastic force opposite to the pressure on one of the first connecting tube 11 and the second connecting tube 12. This elastic force consistently tends to keep the first connecting tube 11 restrained in either the first stop portion 241 or the second stop portion 242. Under the action of the elastic member 23, the first connecting tube 11 maintains a relatively stable position between the first stop portion 241 and the second stop portion 242, and transitions between these positions are relatively easy.

[0040] To achieve a depth difference between the first and second gear portions 241, 242, the guide rail 24 further includes a to-be-locked portion and a to-be-unlocked portion. The first gear portion 241, the to-be-unlocked portion, the second gear portion 242, and the to-be-locked portion cycle sequentially. When the first connecting tube 11 is located in the first gear portion 241, pressing the first connecting tube 11 causes it to move from the first gear portion 241 to the to-be-unlocked portion. The elastic member 23 applies an elastic force to the first connecting tube 11 in the opposite direction of its movement, causing it to move from the to-be-unlocked portion to the second gear portion 242. Then, pressing again causes the first connecting tube 11 to move from the second gear portion 242 to the to-be-locked portion. The elastic force applied by the elastic member 23 to the first connecting tube 11 in the opposite direction of the pressing action causes it to move from the to-be-locked portion to the first gear portion 241.

[0041] Specifically, in this embodiment, three stop portions 243 are formed at the three corners of the limiting groove 2521, and another stop portion 243 is formed at the bending portion of the limiting protrusion 2531. In order to ensure that the first gear portion 241, the portion to be unlocked, the second gear portion 242 and the portion to be locked occur in a cycle, the stop portion 243 at the bending portion of the limiting protrusion 2531 is used to form the portion to be locked, and the three stop portions 243 formed at the corners of the limiting groove 2521 are used to form the second gear portion 242, the first gear portion 241 and the portion to be unlocked in sequence.

[0042] The pressing operation and the elastic force of the elastic member 23 cooperate with each other to drive the first connecting pipe 11 to break away from the stopper 243 and move to the first gear portion 241 and the second gear portion 242 with a depth difference. Figure 3 Taking the initial state where the first connecting tube 11 is located at the first gear portion 241 as an example, the first pressing operation can cause the first connecting tube 11 to start moving from the first gear portion 241, break away from the stopper 243 forming the first gear portion 241, and move along the guide rail 24 to the position of the to-be-unlocked portion. Then, the elastic force of the elastic member 23 can drive the first connecting tube 11 to break away from the stopper 243 forming the to-be-unlocked portion, and continue to move along the guide rail 24 to the second gear portion 242, completing one unlocking.

[0043] Similarly, the second pressing operation can cause the first connecting tube 11 to start moving from the second gear portion 242, disengage from the stops of the two third stop portions 243 forming the second gear portion 242, and move along the guide rail 24 to the position of the portion to be locked. Then, the elastic force of the elastic member 23 can drive the first connecting tube 11 to disengage from the stops of the stop portions 243 forming the portion to be locked, and continue to move along the guide rail 24 to the first gear portion 241, completing one locking.

[0044] In order to achieve a constrained connection between the first connecting tube 11 and the second connecting tube 12 when the first connecting tube 11 is in the first gear portion 241, the locking assembly 2 further includes a first locking member 21 provided on the first connecting tube 11 and a second locking member 22 provided on the second connecting tube 12. When the first connecting tube 11 is in the first gear portion 241, the first locking member 21 and the second locking member 22 are locked to each other. When the first connecting tube 11 is in the second gear portion 242, the first locking member 21 and the second locking member 22 are disengaged from each other.

[0045] Specifically, the first locking member 21 is a clamping buckle, and the second locking member 22 includes at least two opposing clamping jaws 221. The first locking member 21 and the second locking member 22 can slide simultaneously along the guide track 24 with the first connecting tube 11. The second locking member 22 alternates between a retracted state and an extended state. The first locking member 21 can clamp the second locking member 22 in the retracted state or disengage from the second locking member 22 in the extended state. When the at least two opposing clamping jaws 221 are in the retracted state, they can clamp the clamping buckle, constraining the connection between the first connecting tube 11 and the second connecting tube 12. When the at least two opposing clamping jaws 221 are in the extended state, the clamping buckle disengages, allowing the first connecting tube 11 to be separated from the second connecting tube 12 and constrained connection.

[0046] The first side plate 252 and the second side plate 253 form a limiting housing 25, which is disposed on the second connecting tube 12. The limiting housing 25 defines a movable cavity 251 therein and has an opening at one end thereof for communicating with the movable cavity 251. The guide rail 24 is disposed within the movable cavity 251. The second locking member 22 is movably constrained within the limiting housing 25, with at least a portion of the clamping jaw 221 located outside the limiting housing 25. The limiting housing 25 provides protection for the first and second locking members 21, 22, preventing them from being unlocked due to external impact.

[0047] The elastic member 23 is a compression spring, which is constrained within the movable chamber 251. One end of the compression spring is connected to the limiting housing 25, and the other end is connected to the second locking member 22. The elastic force provided by the compression spring to the second locking member 22 is opposite to the direction of movement of the first connecting tube 11. In other words, the elastic force exerted on the second locking member 22 and the pressing force applied by the first locking member 21 to the second locking member 22 are opposite in direction.

[0048] The clamping jaws 221 are made of elastic material. When the first connecting tube 11 is in the second gear portion 242, the multiple clamping jaws 221 move away from each other to form an open state, maintaining the unlocked state of the second gear portion 242; when the first connecting tube 11 is in the first gear portion 241, the clamping jaws 221 produce elastic deformation and form a retracted state, achieving the clamping of the clamping buckle and maintaining the locked state of the first gear portion 241. Figure 4 As shown in the figure, the arrow indicates the pressing direction of the locking pressing operation. By pressing and releasing along this direction, the first connecting tube 11 can be moved from the second gear portion 242 to the first gear portion 241. At the same time, the second locking member 22 passes through the opening and retracts into the limiting housing 25. The limiting housing 25 constrains the multiple clamping claws 221 to retract with each other to clamp the clamping buckle, that is, it is converted into Figure 5 The state shown in Figure 5 As shown, the arrow in the figure indicates the direction of the unlocking pressing operation. Pressing and releasing along this direction can move the first connecting tube 11 from the first gear portion 241 to the second gear portion 242. The shape of the clamping buckle and the clamping claw 221 is not limited to the drawings of this embodiment.

[0049] The unlocking and locking pressing operations can directly act on the first connecting tube 11 , and the first connecting tube 11 drives the clamping buckle to press the clamping claw 221 to transmit the pressing force. The operation is relatively convenient, and the alternating sliding state of the first connecting tube 11 and the second connecting tube 12 can be achieved.

[0050] The second locking member 22 further includes a guide shaft 222, such as Figure 6As shown, one end of the guide shaft 222 is hinged to the clamping jaws 221, and the other end is movably constrained to the guide track 24. The first locking member 21 is located within the cavity formed by at least two clamping jaws 221 and pushes against the second locking member 22, allowing the guide shaft 222 to move along the guide track 24. A slider 2221 is provided on the end of the guide shaft 222, away from the clamping jaws 221. The slider 2221 slides within the guide track 24 and has a curved surface to reduce sliding friction. One end of the guide shaft 222 moves along the guide track 24, while the other end is constrained by the clamping jaws 221 and the limiting housing 25, thereby converting sliding along the guide track 24 into axial reciprocating movement of the clamping jaws 221.

[0051] To further improve the locking reliability of the locking assembly 2, two sets of first locking members 21 and second locking members 22 are symmetrically provided on both axial sides of the pipeline assembly 1. The two sets of first locking members 21 correspond to the two sets of second locking members 22 in a one-to-one correspondence, and accordingly, the two sets of second locking members 22 are each provided with a corresponding limiting housing 25.

[0052] The embodiment of the present invention also provides a cleaning machine, which includes the pipe connection structure as described above. The cleaning machine includes but is not limited to a dishwasher for washing dishes, and can also be other cleaning machines that provide cleaning water by spraying. The pipe connection structure realizes the pressure state of one of the first connecting tube 11 and the second connecting tube 12 by pressing the first connecting tube 11 in the axial direction, thereby realizing the alternating sliding of the first connecting tube 11 and the second connecting tube 12, so that the locking assembly 2 can realize the conversion between the first gear portion 241 and the second gear portion 242. The locking assembly 2 is unlocked and locked by pressing in sequence, which is easy to operate, so that the pipe connection structure takes into account both the convenience of unlocking and the reliability of locking, thereby improving the user experience.

[0053] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pipe connection structure for a cleaning machine, characterized in that: The invention comprises a pipeline assembly (1) and a locking assembly (2), wherein the pipeline assembly (1) comprises a first connecting pipe (11) and a second connecting pipe (12) which are plug-connected to each other, and the locking assembly (2) comprises a guide rail (24), wherein the guide rail (24) comprises a first gear portion (241) and a second gear portion (242) having a depth difference, and wherein one of the first connecting pipe (11) and the second connecting pipe (12) can slide alternately under pressure, so that the first connecting pipe (11) is alternately located in the first gear portion (241) and the second gear portion (242), thereby constraining the first connecting pipe (11) to the second connecting pipe (12) or releasing the constraint.

2. The pipeline connection structure according to claim 1, characterized in that: The guide track (24) is a closed track. The first connecting tube (11) moves unidirectionally along the closed track. The guide track (24) has a plurality of stoppers (243) arranged at intervals along the extension direction. Two adjacent stoppers (243) respectively form the first gear portion (241) and the second gear portion (242). The first gear portion (241) and the second gear portion (242) are arranged in sequence.

3. The pipeline connection structure according to claim 2, characterized in that: The locking assembly (2) includes a first side plate (252) and a second side plate (253) that are arranged opposite to each other, the first side plate (252) is provided with a limiting groove (2521), and the second side plate (253) is provided with a limiting protrusion (2531) on one side facing the limiting groove (2521), the limiting protrusion (2531) is located in the limiting groove (2521), the limiting protrusion (2531) and the edge of the limiting groove (2521) are jointly arranged to form the guide track (24), and a bending angle is provided along the extension direction of the limiting protrusion (2531) and / or the extension direction of the edge to form the stop portion (243).

4. The pipeline connection structure according to claim 1, characterized in that: The locking assembly (2) further comprises an elastic member (23), the elastic member (23) being used to apply an elastic force in a direction opposite to the pressure to one of the first connecting tube (11) and the second connecting tube (12), the elastic force always having a movement tendency to keep the first connecting tube (11) constrained to the first gear portion (241) or to keep it constrained to the second gear portion (242).

5. The pipeline connection structure according to claim 1, characterized in that: The locking assembly (2) further comprises a first locking member (21) provided on the first connecting tube (11) and a second locking member (22) provided on the second connecting tube (12); when the first connecting tube (11) is in the first gear portion (241), the first locking member (21) and the second locking member (22) are locked to each other; when the first connecting tube (11) is in the second gear portion (242), the first locking member (21) and the second locking member (22) are disengaged from each other.

6. The pipeline connection structure according to claim 5, characterized in that: The first locking member (21) is a clamping buckle, and the second locking member (22) includes at least two oppositely arranged clamping claws (221). The first locking member (21) and the second locking member (22) can slide along the guide track (24) simultaneously with the first connecting tube (11). The second locking member (22) is alternately in a retracted state and an open state. The first locking member (21) can clamp the second locking member (22) in the retracted state, or be separated from the second locking member (22) in the open state.

7. The pipeline connection structure according to claim 6, characterized in that: The locking assembly (2) further comprises a limiting shell (25) arranged on the second connecting tube (12), wherein the limiting shell (25) has a movable cavity (251) therein and one end of the limiting shell (25) has an opening for communicating with the movable cavity (251), the guide rail (24) is arranged in the movable cavity (251), the second locking member (22) can be movably constrained in the limiting shell (25) and at least part of the clamping claw (221) is located outside the limiting shell (25).

8. The pipeline connection structure according to claim 7, characterized in that: The clamping jaws (221) are made of elastic material. When the first connecting tube (11) is in the second gear portion (242), the plurality of clamping jaws (221) move away from each other to form an open state; when the first connecting tube (11) is in the first gear portion (241), the clamping jaws (221) are elastically deformed and form a retracted state.

9. The pipeline connection structure according to claim 6, characterized in that: The second locking member (22) further comprises a guide shaft (222), one end of the guide shaft (222) being hinged to the clamping jaws (221), and the other end being movably constrained to the guide track (24); the first locking member (21) is located in a cavity formed by at least two of the clamping jaws (221) and pushes against the second locking member (22) to enable the guide shaft (222) to move along the guide track (24).

10. A cleaning machine, characterized in that The invention comprises a pipeline connection structure according to any one of claims 1 to 9.

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