Pipeline connection structure for wet shotcreting machine and wet shotcreting machine

Abstract

The present invention discloses a pipeline connection structure for a wet spraying machine and the wet spraying machine. The pipeline connection structure includes: a main body having an inner cavity and a feed port, a first outlet, and a second outlet connected to the inner cavity, the feed port being used to connect to a concrete delivery pipeline, the first outlet being used to connect to a spray head, and the second outlet being used to connect to an output portion or a receiving portion of a concrete output system via a return pipe; a core body disposed in the inner cavity of the main body, the core body being provided with a main flow channel and an auxiliary flow channel; a driving device disposed outside the main body and drivingly connected to the core body, for driving the core body to move in the inner cavity, thereby connecting the main flow channel to the feed port and the first outlet and the auxiliary flow channel to the second outlet, or connecting the main flow channel to the feed port and the second outlet and the auxiliary flow channel to the first outlet; and an air entrainment structure disposed in the main body and connected to an external air source, for introducing compressed air into the auxiliary flow channel. The pipeline connection structure has a simple structure, strong working stability, and low maintenance difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of wet spraying concrete construction, and in particular to a pipe connection structure for a wet spraying machine. In addition, the present invention also relates to a wet spraying machine comprising the pipe connection structure for the wet spraying machine. Background Art

[0002] During the operation of the concrete wet spraying machine, when the spraying is briefly stopped, the concrete mortar retained in the pipeline is prone to uneven settlement, resulting in the quality not meeting the requirements when spraying again. In addition, the concrete at the inlet of the nozzle at the end of the pipeline may begin to solidify, increasing the resistance or even clogging, causing work interruption and requiring the cleaning of the entire pipeline, which increases a lot of construction time and material costs.

[0003] In the prior art, for example, publication number CN206845191U discloses a concrete wet spraying pipeline lubrication and cleaning device, which includes a bend, an air inlet, and a lubrication and cleaning port. One end of the bend is connected to the wet spraying machine, and the other end is connected to the concrete delivery pipe. The air inlet is connected to an air source, and the central axis of the air inlet coincides with the axis of the concrete output end of the bend, which is conducive to blowing in air. The angle formed by the central axis of the lubrication and cleaning port and the axis of the concrete output end of the bend is an obtuse angle, which makes it easier for cement slurry and water to be blown into the concrete delivery pipe. When lubricating the pipeline, the lubrication and cleaning port is connected to the cement slurry container. When cleaning the pipeline, the lubrication and cleaning port is connected to the water source. Before wet spraying concrete, this device is used to blow cement slurry onto the inner wall of the pipeline with air. Only a small amount of cement slurry is needed to fully lubricate the pipeline. After the wet spraying is completed, this device can also be used to clean the pipeline, and the cleaning efficiency is improved by the combined flushing of air and water. Another example is a device for adding air to clean concrete wet spraying machines, disclosed in Publication No. CN206838684U. The device includes a concrete delivery pipeline connected to a pumping system. The concrete delivery pipeline includes a straight delivery pipe and a connecting elbow. The head joint of the connecting elbow is connected to the pumping system, and the tail joint of the connecting elbow is connected to the delivery pipe. The delivery pipe is arranged coaxially along the extension of the pipe body section where the tail joint of the connecting elbow is located. The connecting elbow is provided with a cleaning air inlet pipe, which is sealed and connected to the interior of the connecting elbow. The air outlet direction of the cleaning air inlet pipe is arranged along the central axis of the delivery pipe. The cleaning air inlet pipe is connected to an external air supply source. This utility model achieves efficient cleaning of the delivery pipeline, ensuring that the pipeline is clean and completely preventing pipeline blockage. It can be seen that existing technical solutions all perform pipeline cleaning after wet spraying is completed. That is, pipeline cleaning may be required every time spraying is paused to avoid blockage. Each time spraying is resumed, the concrete pump must be run to refill the pipeline before work can begin. This results in high material costs and low construction efficiency. Summary of the Invention

[0004] The present invention provides a pipeline connection structure for a wet spraying machine and a wet spraying machine, so as to solve the technical problem that the existing wet spraying machine needs to clean the pipeline after pausing wet spraying and resuming spraying to avoid blockage, resulting in low work efficiency, material waste and high cost.

[0005] According to one aspect of the present invention, there is provided a pipeline connection structure for a wet spraying machine, the pipeline connection structure comprising:

[0006] A main body having an inner cavity and a feed port, a first outlet, and a second outlet connected to the inner cavity, wherein the feed port is used to be connected to a concrete delivery pipeline, the first outlet is used to be connected to a nozzle, and the second outlet is used to be connected to an output portion or a receiving portion of a concrete delivery system via a return pipe;

[0007] A core body is arranged in the inner cavity of the main body, and the core body is provided with a main flow channel and an auxiliary flow channel;

[0008] a driving device, disposed outside the main body and drivingly connected to the core, for driving the core to move within the inner cavity so as to connect the main channel to the feed inlet and the first outlet, and the auxiliary channel to the second outlet, or to connect the main channel to the feed inlet and the second outlet, and the auxiliary channel to the first outlet;

[0009] The air introduction structure is arranged on the main body and connected to an external air source, and is used for introducing compressed air into the auxiliary flow channel.

[0010] As a further improvement of the above technical solution, the inner cavity of the main body and the core body are matching rotating body structures, the first outlet and the second outlet are symmetrically distributed at one end of the main body, the end of the main channel facing the feed port is located in the middle of the rotating body structure, the first outlet and the second outlet are symmetrically distributed on the core body, and the driving device is used to drive the core body to rotate circumferentially in the inner cavity and thereby switch the connection position of the main channel and the auxiliary channel.

[0011] As a further improvement of the above technical solution, the air ducting structure includes a connecting joint arranged on the outer wall of the main body, a first air ducting hole respectively connecting the connecting joint and the inner wall of the main body, an annular air ducting groove opened on the outer wall of the main body and matching the position of the first air ducting hole, and a second air ducting hole opened on the main body for connecting the annular air ducting groove and the auxiliary flow channel.

[0012] As a further improvement of the above technical solution, the second air inlet hole is arranged at a position close to the inner end of the auxiliary flow channel.

[0013] As a further improvement of the above technical solution, the outer walls at both ends of the core are respectively provided with annular grooves for embedding sealing rings.

[0014] As a further improvement of the above technical solution, a mounting structure is provided in the middle of the main body between the first outlet and the second outlet for mounting a driving device, and an output shaft of the driving device passes through the main body and is connected to the core.

[0015] As a further improvement of the above technical solution, the pipeline connection structure also includes a control module electrically connected to the driving device, which is used to receive a control instruction to enable the driving device to drive the core to rotate a preset angle.

[0016] As a further improvement of the above technical solution, the main body and / or the core body is provided with a limiting structure for limiting the rotation angle of the core body within a range of 180°, and the driving device is used to receive a control instruction to drive the core body to rotate and the rotation direction is opposite to the previous rotation direction.

[0017] As a further improvement of the above technical solution, the pipeline connection structure also includes a quick-connect installation assembly, including annular mounting buckles respectively arranged at the first outlet and the second outlet, and the annular mounting buckles are used to fasten the nozzle to the first outlet and to fix one end of the return pipe to the second outlet.

[0018] According to another aspect of the present invention, a wet spraying machine is provided, which includes the above-mentioned pipeline connection structure for the wet spraying machine.

[0019] The present invention has the following beneficial effects:

[0020] The present invention relates to a pipe connecting structure for connecting the feed port and the nozzle of the wet spraying machine. The pipe connecting structure is applied to the output pipe and the nozzle of the wet spraying machine, through the main structure respectively provided with the feed port, the first outlet, the second outlet and the inner cavity connected with each opening, by arranging a core body in the inner cavity and controlling the movement of the core body by the driving device, controlling the position change of the outlet end of the main channel in the core body, thereby realizing the switching of the connection between the feed port and the first outlet or the second outlet, and the outlet not connected with the feed port is connected with the auxiliary channel; based on the above structure, in the working state, the main channel of the core body connects the feed port and the first outlet to the nozzle, and the auxiliary channel connects the second outlet to the return pipe, and the concrete is sprayed out through the output pipe, the feed port, the main channel, the first outlet to the nozzle. When it is necessary to pause the concrete spraying, the driving device drives the core body to move, so that the main channel connects the feed port and the second outlet, and the auxiliary channel is connected to the first outlet, and the input concrete flows back to the system through the feed port, the main channel, the second outlet to the return pipe, thereby keeping the concrete in flow Dynamic state, that is, wet spraying concrete always maintains a flowing state during the construction process, effectively avoiding pipeline and spraying blockage and even construction quality problems caused by uneven settlement of concrete and retention blockage, and the auxiliary channel introduces compressed air through the air duct structure connected to the external air source to blow away the concrete between the first outlet and the nozzle outlet end, so that there is no concrete residue inside the pipeline and the nozzle, and the flow channel is kept unobstructed. When the spraying is resumed, the auxiliary flow channel is switched to connect to the second outlet, and the concrete in the return pipe loses power. The concrete in the return pipe is driven back to the system by the introduced compressed air. On the other hand, based on this pipeline connection structure, when the spraying is suspended during construction, the concrete always flows through the feed port. After the spraying is resumed, the concrete only needs to flow through the main channel and the nozzle to resume the spraying, which greatly reduces the waiting time and material waste when the spraying is temporarily stopped and restarted; the overall structure of this pipeline connection structure is simple, the working stability is strong, and the maintenance difficulty is low.

[0021] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 is a cross-sectional view of the main channel of the pipeline connection structure of the preferred embodiment of the present invention connected to the first interface;

[0024] Figure 2 It is a cross-sectional view of the main channel of the pipeline connection structure connected to the second interface in a preferred embodiment of the present invention.

[0025] Legend:

[0026] 1. Main body; 11. Feed inlet; 12. First outlet; 13. Second outlet; 2. Core; 21. Main flow channel; 22. Auxiliary flow channel; 3. Air inlet structure; 31. Connecting joint; 32. First air inlet hole; 33. Annular groove; 34. Second air inlet hole; 4. Driving device; 5. Annular mounting buckle; 6. Return pipe; 7. Nozzle. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0028] Figure 1 is a cross-sectional view of the main channel of the pipeline connection structure of the preferred embodiment of the present invention connected to the first interface; Figure 2 It is a cross-sectional view of the main channel of the pipeline connection structure connected to the second interface in a preferred embodiment of the present invention.

[0029] like Figure 1 and Figure 2 As shown, the pipeline connection structure for the wet spraying machine of this embodiment includes:

[0030] The main body 1 has an inner cavity and a feed port 11, a first outlet 12, and a second outlet 13 connected to the inner cavity. The feed port 11 is used to connect to the concrete delivery pipeline, the first outlet 12 is used to connect to the nozzle 7, and the second outlet 13 is used to connect to the output part or the receiving part of the concrete output system through the return pipe 6.

[0031] The core 2 is disposed in the inner cavity of the main body 1 and is provided with a main flow channel 21 and an auxiliary flow channel 22;

[0032] The driving device 4 is disposed outside the main body 1 and is drivingly connected to the core body 2, and is used to drive the core body 2 to move in the inner cavity so that the main channel 21 is connected to the feed inlet 11 and the first outlet 12, and the auxiliary channel 22 is connected to the second outlet 13, or the main channel 21 is connected to the feed inlet 11 and the second outlet 13, and the auxiliary channel 22 is connected to the first outlet 12;

[0033] The air introduction structure 3 is provided on the main body 1 and connected to an external air source, and is used to introduce compressed air into the auxiliary flow channel 22 .

[0034] It can be understood that the present pipeline connection structure is applied between the output pipeline of the wet spraying machine and the nozzle 7, and the feed port 11, the first outlet 12, the second outlet 13 and the inner cavity connected to each opening are respectively provided through the structure of the main body 1. By arranging the core 2 in the inner cavity and controlling the movement of the core 2 by the driving device 4, the position change of the outlet end of the main flow channel 21 in the core 2 is controlled to realize the switching of the communication between the feed port 11 and the first outlet 12 or the second outlet 13, and the outlet not connected to the feed port 11 is connected to the auxiliary flow channel 22; based on the above In the above structure, in the working state, the main flow channel 21 of the core body 2 is connected to the feed port 11 and the first outlet 12 to the nozzle 7, and the auxiliary flow channel 22 is connected to the second outlet 13 to the return pipe 6. Concrete is sprayed out through the output pipe, the feed port 11, the main flow channel 21, the first outlet 12 to the nozzle 7. When it is necessary to pause the concrete spraying, the core body 2 is driven by the driving device 4 to move, so that the main flow channel 21 is connected to the feed port 11 and the second outlet 13, and the auxiliary flow channel 22 is connected to the first outlet 12. The input concrete is sprayed out through the feed port 11, the main flow channel 21, the second outlet 12, and the return pipe 6. The outlet 13 flows back to the return pipe 6 into the system, thereby keeping the concrete in a flowing state, that is, the wet sprayed concrete always remains in a flowing state during the construction process, effectively avoiding pipeline and spraying blockage and even construction quality problems caused by uneven settlement and retention of concrete, and the auxiliary channel introduces compressed air through the air duct structure 3 connected to the external air source to blow away the concrete between the first outlet 12 and the outlet end of the nozzle 7, so that there is no concrete residue inside the pipeline and the nozzle 7, keeping the flow channel unobstructed, and when resuming spraying, the auxiliary flow channel 22 switches to connect to the second outlet 13, and the concrete in the return pipe 6 loses power. The concrete in the return pipe 6 is driven by the introduced compressed air to flow back into the system. On the other hand, based on this pipeline connection structure, when the spraying is suspended during construction, the concrete always flows through the feed port 11. After resuming spraying, the concrete only needs to flow through the main channel 21 and the nozzle 7 to resume spraying, which greatly reduces the waiting time and material waste when the spraying is temporarily stopped and restarted; the overall structure of the pipeline connection structure is simple, the working stability is strong, and the maintenance difficulty is low.

[0035] In some embodiments, the inner cavity of the main body 1 and the core body 2 are matched rotating body structures, the first outlet 12 and the second outlet 13 are symmetrically distributed and arranged at one end of the main body 1, and the end of the main channel 21 facing the feed port 11 is located in the middle of the rotating body structure, the first outlet 12 and the second outlet 13 are symmetrically distributed and arranged on the core body 2, and the driving device 4 is used to drive the core body 2 to rotate circumferentially in the inner cavity and thus switch the connection position of the main channel 21 and the auxiliary channel 22, wherein the driving device 4 can be a motor; specifically, the feed port 11 and the core body 2 and the inlet end of the main channel 21 are coaxially arranged, and the outlet end of the main channel 21 and the outer end of the auxiliary channel 22 are symmetrically arranged based on the rotation axis of the core body 2. Similarly, the first outlet 12 and the second outlet 13 are symmetrically arranged based on the rotation axis, and the first outlet The distance between the center of 12 and the center of the second outlet 13 matches the distance between the center of the outlet end of the main channel 21 and the center of the outer end of the auxiliary channel 22, so that the channel switching can be achieved by only driving the core body 2 to rotate 180 degrees in the main body 1, thereby realizing the switching control of the nozzle 7 outputting concrete, the airflow pushing the pipeline backflow, and the airflow blowing out the residual concrete in the nozzle 7 and the concrete backflow. The structure is simple and the service life is long. It should be understood that in order to facilitate the structural layout and disassembly, the core body 2 is constructed in a truncated cone / conical shape, and the outlet end of the main body 1 is provided with an end cover, that is, the first outlet 12 and the second outlet 13 are provided on the end cover. The core body 2 is installed or removed from the outlet end of the main body 1. Its conical structure is convenient for the layout of the main channel 21 and the auxiliary channel 22, and at the same time facilitates the disassembly and maintenance of the core body 2.

[0036] In some embodiments, the air duct structure 3 includes a connecting joint 31 arranged on the outer wall of the main body 1, a first air duct hole 32 respectively connecting the connecting joint 31 and the inner wall of the main body 1, an annular air duct groove opened on the outer wall of the main body 1 and matching the position of the first air duct hole 32, and a second air duct hole 34 opened on the main body 1 for connecting the annular air duct groove and the auxiliary flow channel 22. The air pipeline with the external air source can be quickly plugged in and out through the connecting joint 31, which is convenient to operate; the first air duct hole 32 introduces the incoming air flow into the main body 1, and the annular air duct groove is opened on the core body 2, so that no matter which position it is rotated to, the compressed air can be introduced into the second air duct hole 34 and then into the auxiliary flow channel 22. The structure is simple and reasonable, and air ducting can be achieved throughout the construction process by only inserting the air pipeline. The simplified mechanical structure can achieve air ducting to the auxiliary flow channel 22 in the switching state without the need for additional intervention and control.

[0037] It can be understood that the auxiliary flow channel 22 is a blind hole. In some embodiments, the second air inlet hole 34 is arranged at a position close to the inner end of the auxiliary flow channel 22. It should be noted that the second air inlet hole 34 is arranged close to the inner end of the auxiliary flow channel 22 so that the compressed air mainly flows through the auxiliary flow channel 22 and then is drawn out, avoiding airflow turbulence and airflow complexity, and further optimizing the internal structure of the auxiliary flow channel 22 to achieve acceleration and stabilization of the drawn-out compressed air.

[0038] In some embodiments, the outer walls at both ends of the core body 2 are respectively provided with annular grooves 33 for embedding the sealing ring. Specifically, the two ends of the core body 2 are cylindrical, and the middle part is truncated cone-shaped. The shape of the inner cavity of the main body 1 matches it. The annular grooves 33 are opened on the outer walls of the cylindrical structure at both ends of the core body 2 to embed the sealing ring, which is more stable when matched with the inner cavity of the main body 1 to ensure the sealing effect.

[0039] In some embodiments, a mounting structure is provided in the middle of the main body 1 between the first outlet 12 and the second outlet 13 for mounting the driving device 4. The output shaft of the driving device 4 passes through the main body 1 and is connected to the core 2. It can be understood that

[0040] In some embodiments, the pipeline connection structure further includes a control module electrically connected to the drive device 4, for receiving a control instruction to cause the drive device 4 to drive the core 2 to rotate a preset angle. Specifically, the control module controls the core 2 to rotate 180° in any direction to switch the nozzle 7 between output and pause.

[0041] Furthermore, in some embodiments, the main body 1 and / or the core 2 may be provided with a limiting structure for limiting the rotation angle of the core 2 within a range of 180°, and the driving device 4 is used to receive a control instruction to drive the core 2 to rotate, and the rotation direction is opposite to the previous rotation direction, that is, when switching modes, the driving device 4 drives the core 2 to rotate 180° from the current circumferential position, that is, to reach the limit rotation position, and the limiting structure limits it to prevent over-rotation, and resets it when resetting. By setting the limiting structure, the driving device 4 can be set to drive its rotation angle slightly greater than 180° or stop after being obstructed and maintain the load, without the driving device 4 performing fine control of its circumferential rotation position, thereby avoiding adverse consequences caused by position deviation after long-term use, etc.; wherein, the limiting structure may include a limiting protrusion (not shown in the figure) provided on the end face of the outlet end of the core 2 and an arc-shaped limiting groove opened on the end cover of the main body 1. When the end cover is closed and locked, the limiting protrusion is located in the arc-shaped limiting groove to achieve rotation angle limitation.

[0042] In some embodiments, the pipeline connection structure also includes a quick-connect installation assembly, including an annular mounting buckle 5 respectively arranged at the first outlet 12 and the second outlet 13. The annular mounting buckle 5 is used to fasten the nozzle 7 to the first outlet 12 and to fix one end of the return pipe 6 to the second outlet 13. An annular groove is provided on the inner ring surface of the annular mounting buckle 5, and connecting flanges are respectively provided at the connecting end of the nozzle 7, the first outlet 12, the second outlet 13 and the connecting end of the return pipe. The annular mounting buckle 5 can be two semicircular rings butt-jointed, so that the connecting flanges of the first outlet 12 and the nozzle 7 are overlapped and embedded in the annular groove for installation.

[0043] In other embodiments, quick connection and disconnection between the nozzle and the first outlet, and quick connection and disconnection between the return pipe and the second outlet may be achieved by using circumferentially evenly distributed clips hinged to the connecting flange.

[0044] On the other hand, a preferred embodiment of the present invention further provides a wet spraying machine, which is equipped with the above-mentioned pipeline connection structure for the wet spraying machine.

[0045] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A pipe connection structure for a wet spraying machine, characterized in that: The pipeline connection structure includes: The main body (1) has an inner cavity and a feed port (11), a first outlet (12), and a second outlet (13) connected to the inner cavity. The feed port (11) is used to be connected to a concrete delivery pipeline. The first outlet (12) is used to be connected to a nozzle (7). The second outlet (13) is used to be connected to an output portion or a receiving portion of a concrete delivery system via a return pipe (6). A core body (2) is arranged in the inner cavity of the main body (1), and the core body (2) is provided with a main flow channel (21) and an auxiliary flow channel (22); a driving device (4) disposed outside the main body (1) and drivingly connected to the core (2), for driving the core (2) to move within the inner cavity so as to connect the main flow channel (21) to the feed port (11) and the first outlet (12), and connect the auxiliary flow channel (22) to the second outlet (13), or connect the main flow channel (21) to the feed port (11) and the second outlet (13), and connect the auxiliary flow channel (22) to the first outlet (12); an air introduction structure (3), arranged on the main body (1) and connected to an external air source, for introducing compressed air into the auxiliary flow channel (22); The inner cavity of the main body (1) and the core (2) are matched rotating body structures, the first outlet (12) and the second outlet (13) are symmetrically distributed and arranged at one end of the main body (1), the end of the main flow channel (21) facing the feed port (11) is located in the middle of the rotating body structure, the first outlet (12) and the second outlet (13) are symmetrically distributed and arranged on the core (2), and the driving device (4) is used to drive the core (2) to rotate circumferentially in the inner cavity and thereby switch the connection position of the main flow channel (21) and the auxiliary flow channel (22); The air induction structure (3) comprises a connecting joint (31) provided on the outer wall of the main body (1), a first air induction hole (32) respectively connected to the connecting joint (31) and the inner wall of the main body (1), an annular air induction groove provided on the outer wall of the main body (1) and matching the position of the first air induction hole (32), and a second air induction hole (34) provided on the main body (1) for connecting the annular air induction groove and the auxiliary flow channel (22).

2. The pipe connection structure for a wet spraying machine according to claim 1, characterized in that: The second air inlet hole (34) is arranged at a position close to the inner end of the auxiliary flow channel (22).

3. The pipe connection structure for a wet spraying machine according to claim 1, characterized in that: The outer walls at both ends of the core (2) are respectively provided with annular grooves (33) for embedding sealing rings.

4. The pipe connection structure for a wet spraying machine according to any one of claims 1 to 3, characterized in that: A mounting structure located between the first outlet (12) and the second outlet (13) is provided in the middle of the main body (1) for mounting a drive device (4). The output shaft of the drive device (4) passes through the main body (1) and is connected to the core (2).

5. The pipe connection structure for a wet spraying machine according to claim 4, characterized in that: The pipeline connection structure also includes a control module electrically connected to the drive device (4), which is used to receive a control instruction to enable the drive device (4) to drive the core (2) to rotate a preset angle.

6. The pipe connection structure for a wet spraying machine according to claim 5, characterized in that: The main body (1) and / or the core (2) are provided with a limiting structure for limiting the rotation angle of the core (2) within a range of 180°, and the driving device (4) is used to receive a control instruction to drive the core (2) to rotate, and the rotation direction is opposite to the previous rotation direction.

7. The pipe connection structure for a wet spraying machine according to claim 1, characterized in that: The pipeline connection structure also includes a quick-connect installation assembly, including annular installation buckles (5) respectively arranged at the first outlet (12) and the second outlet (13), and the annular installation buckles (5) are used to fasten the nozzle (7) to the first outlet (12) and to fix one end of the return pipe (6) to the second outlet (13).

8. A wet spraying machine, characterized in that: The invention relates to a pipeline connection structure for a wet spraying machine according to any one of claims 1 to 7.

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