Integrated spray gun structure and coating machine

Abstract

The utility model provides an integrated spray gun structure and a coating machine, which belong to the technical field of coating machines and comprise an integrated pipeline and a plurality of spray head components. A liquid inlet path channel, a liquid return path channel and a spraying gas path channel are axially arranged in the integrated pipeline, and a gas spraying port is formed in the lower end of the spraying gas path channel; the multiple spray head assemblies are sequentially arranged in the axial direction of the integrated pipeline, penetrate through the integrated pipeline from top to bottom and are embedded in the integrated pipeline, liquid spraying channels are formed in the spray head assemblies, liquid inlet ports are formed in the upper ends of the liquid spraying channels, and liquid outlet ports are formed in the lower ends of the liquid spraying channels. According to the integrated spray gun structure provided by the utility model, an integrated structure is formed, and the spray head components are connected without adopting more pipelines, so that the number of the pipelines is greatly reduced, cleaning dead angles are reduced, the threat of bacterium breeding to the product quality safety is reduced, and meanwhile, the space occupancy rate is also reduced; and the problem that the sight of an operator is influenced by too many pipelines is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of coating machine technology, and more specifically, it relates to an integrated spray gun structure and a coating machine. Background Technology

[0002] In industries such as pharmaceuticals and food, where coating of granular or flake materials is required, the spray gun bar of a perforated coating machine plays a crucial role, directly affecting the quality and efficiency of coating. Currently, the widely used spray gun bars of perforated coating machines typically employ a multi-nozzle design connected in series via piping.

[0003] This traditional design, with its complex piping structure, creates numerous hard-to-reach corners. During the cleaning process, conventional cleaning methods cannot thoroughly remove residual material from these corners, leading to bacterial growth over time and posing a serious threat to product quality and safety. Multiple sets of connecting air pipes tangled around the joints occupy a large amount of space haphazardly, obstructing the operator's view and preventing real-time, comprehensive observation of the coating process. This makes it difficult to promptly detect abnormalities such as nozzle blockage or uneven material accumulation. Utility Model Content

[0004] The purpose of this utility model is to provide an integrated spray gun structure, which aims to solve the problems of complex pipeline structures leading to numerous cleaning dead spots, bacterial growth posing a serious threat to product quality and safety, and complex pipeline structures also occupying a lot of space and obstructing the operator's view.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an integrated spray gun structure, comprising:

[0006] An integrated pipeline is provided with an axially arranged liquid inlet channel, liquid return channel, and spray air channel. The liquid inlet channel and the liquid return channel are both located above the spray air channel. One end of the liquid inlet channel and the same end of the liquid return channel are connected. The lower end of the spray air channel is provided with a jet port.

[0007] Multiple nozzle assemblies are arranged sequentially along the axial direction of the integrated pipe. The nozzle assemblies are inserted into the integrated pipe from top to bottom. The nozzle assemblies have a liquid spraying channel axially opened inside. The upper end of the liquid spraying channel is provided with a liquid inlet port that connects to the liquid inlet channel. The lower end of the liquid spraying channel is provided with a liquid outlet port that extends out from the jet port. The jet port provides high-pressure gas to atomize the liquid discharged from the liquid outlet port and spray it outward.

[0008] In one possible implementation, one end of the integrated pipe is provided with a liquid inlet, a liquid outlet, and a spray gas inlet. The liquid inlet is connected to the liquid inlet channel, the liquid outlet is connected to the liquid return channel, and the spray gas inlet is connected to the spray gas channel. The other end of the integrated pipe is provided with a first liquid circulation port and a second liquid circulation port that are connected to each other. The first liquid circulation port is connected to the liquid inlet channel, and the second liquid circulation port is connected to the liquid return channel.

[0009] In one possible implementation, the integrated pipeline includes:

[0010] Multiple integrated valve blocks are arranged axially in sequence. The liquid inlet channel, liquid return channel, and spray air channel are all opened along the axial direction of the integrated valve block. At least one nozzle assembly is provided on the integrated valve block.

[0011] Multiple connecting clamps are provided, which connect adjacent integrated valve blocks.

[0012] Two end clamps are respectively disposed at the outer ends of the integrated valve blocks at both ends. The liquid inlet, liquid outlet and spray gas inlet are disposed on one end clamp, and the first liquid circulation port and the second liquid circulation port are disposed on the other end clamp.

[0013] In one possible implementation, the integrated pipeline also has an axially oriented control gas channel located above the liquid inlet channel and the liquid return channel. The control gas channel is sequentially connected to multiple nozzle assemblies for synchronously controlling the start and stop of the multiple nozzle assemblies.

[0014] In one possible implementation, the nozzle assembly includes:

[0015] A valve sleeve is longitudinally inserted and embedded in the integrated pipe. A longitudinal channel is axially opened inside the valve sleeve. The liquid inlet port is opened on the outer wall of the valve sleeve and communicates with the longitudinal channel. A valve cover is provided at the upper end of the valve sleeve. A top chamber communicating with the longitudinal channel is formed between the valve cover and the valve sleeve.

[0016] The resilient valve core includes a valve core body that slides within the longitudinal channel. The upper end of the valve core body is provided with an elastic end, which is located in the top chamber and has a degree of freedom in the height direction. The control gas channel is connected to the bottom of the top chamber. The lower end of the valve core body is provided with a valve needle, which forms the liquid injection channel with the longitudinal channel. The lower end of the valve needle and the lower end of the longitudinal channel form the liquid discharge port.

[0017] In one possible implementation, the upper end of the valve sleeve is provided with an upper end sleeve, the valve sleeve is fitted onto the outer periphery of the upper end sleeve, the inner cavity of the upper end sleeve and the inner cavity of the valve cover together constitute the top chamber, the lower end of the elastic end is attached to the bottom of the inner cavity of the upper end sleeve, and the bottom of the upper end sleeve is provided with an air inlet channel communicating with the control gas channel.

[0018] In one possible implementation, the resilient end includes:

[0019] End block, the lower end of which is attached to the bottom of the inner cavity of the upper end sleeve;

[0020] A first sealing ring is fitted onto the outer periphery of the end block;

[0021] A spring, the lower end of which is sleeved on the upper end of the end block, and the lower end of which abuts against the top of the inner cavity of the valve sleeve.

[0022] In one possible implementation, the outer periphery of the valve sleeve is fitted with an upper sealing ring and a lower sealing ring from top to bottom, the upper sealing ring being located above the liquid inlet channel and the lower sealing ring being located below the liquid inlet channel.

[0023] In one possible implementation, the lower end of the valve sleeve is provided with a tapered end, and the lower end of the tapered end is provided with a necked section. The bottom of the spray gas passage is provided with a plurality of tapered holes, and the lower end of the tapered holes is provided with a straight hole section. The tapered end is coaxially inserted into the corresponding tapered hole, and a first spray gas gap is formed between the tapered end and the tapered hole. The necked section is coaxially inserted into and passes through the straight hole section, and a second spray gas gap is formed between the necked section and the straight hole section. The first spray gas gap is connected to the second spray gas gap.

[0024] The beneficial effects of the integrated spray gun structure provided by this utility model are as follows: Compared with the prior art, multiple nozzle assemblies are inserted and embedded in the integrated pipe from top to bottom along the axial direction of the integrated pipe. Liquid flows sequentially through the inlet channel and the return channel. High-pressure gas is introduced into the spray gas channel. Liquid in the inlet channel enters the spray channel through the inlet port and is discharged through the outlet port. When the liquid is discharged through the outlet port, high-pressure gas is provided to atomize the liquid discharged from the outlet port and spray it outwards, forming an atomized liquid spray. The integrated spray gun structure provided by this utility model forms an integrated structure, eliminating the need for additional pipes to connect the various nozzle assemblies. This significantly reduces the number of pipes, reduces blind spots, lowers the threat of bacterial growth to product quality and safety, and also reduces space occupancy, avoiding the problem of excessive pipes obstructing the operator's view.

[0025] This utility model also provides a coating machine, including the aforementioned integrated spray gun structure.

[0026] The beneficial effects of the coating machine provided by this utility model are as follows: compared with the prior art, since the coating machine uses the above-mentioned integrated spray gun structure, it has the same beneficial effects as the integrated spray gun structure, which will not be elaborated here. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of an integrated spray gun structure provided by this utility model;

[0029] Figure 2 for Figure 1 Cross-sectional view at point M;

[0030] Figure 3 This utility model provides a three-dimensional integrated spray gun structure. Figure 1 ;

[0031] Figure 4 for Figure 3 Cross-sectional view at point N;

[0032] Figure 5 This utility model provides a three-dimensional integrated spray gun structure. Figure 2 ;

[0033] Figure 6 for Figure 5 Cross-sectional view at point P.

[0034] In the diagram: 1. Connecting clamp; 2. Integrated valve block; 3. Nozzle assembly; 4. Control gas connector; 5. Liquid pipeline connector; 6. Gas pipeline connector; 7. Liquid spray; 9. Valve cover; 10. Air inlet channel; 11. Control gas channel; 12. Liquid inlet port; 13. Liquid return channel; 14. Spray gas channel; 15. First spray gas gap; 16. Valve needle; 17. Second spray gas gap; 18. Spray channel; 19. Lower sealing ring; 20. Second sealing ring; 21. Liquid inlet channel; 22. Valve core body; 23. Upper sealing ring; 24. End block; 25. First sealing ring; 26. Upper end sleeve; 27. Spring; 28. Liquid inlet; 29. ​​Liquid outlet; 30. Spray gas inlet; 31. First liquid circulation port; 32. Second liquid circulation port. Detailed Implementation

[0035] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0036] Unless otherwise explicitly specified, the use of terms such as "first," "second," or "third" is intended to distinguish different objects, not to describe a specific order.

[0037] Unless otherwise expressly defined, the use of directional terms such as “center,” “lateral,” “longitudinal,” “horizontal,” “vertical,” “top,” “bottom,” “inner,” “outer,” “upper,” “lower,” “front,” “back,” “left,” “right,” “clockwise,” “counterclockwise,” “high,” and “low” to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of the present invention.

[0038] Please see Figures 1 to 6 The present invention provides an integrated spray gun structure. An integrated spray gun structure includes an integrated pipe and multiple nozzle assemblies 3. An inlet channel 21, a return channel 13, and a spray air channel 14 are axially arranged within the integrated pipe. The inlet channel 21 and the return channel 13 are both located above the spray air channel 14. One end of the inlet channel 21 is connected to the same end of the return channel 13. A jet port is provided at the lower end of the spray air channel 14. Multiple nozzle assemblies 3 are arranged sequentially along the axial direction of the integrated pipe. The nozzle assemblies 3 penetrate from top to bottom and are embedded within the integrated pipe. An axial spray channel 18 is provided inside each nozzle assembly 3. An inlet port 12 connecting to the inlet channel 21 is provided at the upper end of the spray channel 18, and a drain port extending from the jet port is provided at the lower end of the spray channel 18. The jet port provides high-pressure gas to atomize the liquid discharged from the drain port and spray it outwards.

[0039] This utility model provides an integrated spray gun structure. Compared with the prior art, multiple nozzle assemblies 3 are installed in the integrated pipe from top to bottom along the axial direction of the integrated pipe. Liquid flows sequentially through the inlet channel 21 and the return channel 13. High-pressure gas is introduced into the spray gas channel 14. The liquid in the inlet channel 21 enters the spray channel 18 through the inlet port 12 and is discharged through the outlet port. When the liquid is discharged through the outlet port, high-pressure gas is provided to atomize the liquid discharged from the outlet port and spray it outward, forming an atomized liquid spray 7. The integrated spray gun structure provided by this utility model forms an integrated structure. There is no need to use more pipelines to connect the various nozzle assemblies 3, which greatly reduces the number of pipelines, reduces cleaning dead zones, reduces the threat of bacterial growth to product quality and safety, and also reduces space occupation, avoiding the problem of excessive pipelines affecting the operator's vision.

[0040] Please see Figure 1 , Figure 4 and Figure 6 One end of the integrated pipe is equipped with two liquid pipe connectors 5 and one gas pipe connector 6. The two liquid pipe connectors 5 are connected to a liquid inlet 28 and a liquid outlet 29, respectively, and the gas pipe connector 6 is connected to a spray gas inlet 30. In addition, the liquid inlet 28 is connected to the liquid inlet channel 21, the liquid outlet 29 is connected to the liquid return channel 13, and the spray gas inlet 30 is connected to the spray gas channel 14. The other end of the integrated pipe is closed on the outside and has a connecting chamber on the inside. The first liquid circulation port 31 at the end of the liquid inlet channel 21 and the second liquid circulation port 32 at the end of the liquid return channel 13 are respectively connected to the left and right sides of the connecting chamber, so that the liquid inlet channel 21 and the liquid return channel 13 are connected at the other end of the integrated pipe. The liquid in the liquid inlet channel 21 that is not sprayed through the nozzle assembly 3 will return to the liquid return channel 13, thus forming a circulation pipeline.

[0041] In addition, the integrated pipeline includes multiple integrated valve blocks 2, multiple connecting clamps 1, and two end clamps. The multiple integrated valve blocks 2 are arranged axially in sequence. The liquid inlet channel 21, the liquid return channel 13, and the spray gas channel 14 are all opened in the axial direction of the integrated valve blocks 2. At least one nozzle assembly 3 is provided on the integrated valve block 2. The connecting clamps 1 are connected between adjacent integrated valve blocks 2. The two end clamps are respectively set at the outer ends of the two integrated valve blocks 2. The liquid inlet 28, the liquid outlet 29, and the spray gas inlet 30 are set on one end clamp, and the first liquid circulation port 31 and the second liquid circulation port 32 are set on the other end clamp.

[0042] Multiple integrated valve blocks 2 are arranged axially in sequence, forming the basic structure of the entire integrated pipeline. The inlet channel 21, return channel 13, and spray gas channel 14 are all located axially on the integrated valve block 2. These channels ensure stable delivery of liquid and gas during the coating process. Each integrated valve block 2 is equipped with at least one nozzle assembly 3, which is embedded within the integrated valve block 2, achieving a tight connection between the nozzle and the pipeline. This ensures efficient transmission of coating liquid and gas from the pipeline to the nozzle assembly 3, providing hardware support for uniform coating. Connecting clamps 1 play a crucial role in ensuring a stable connection between adjacent integrated valve blocks 2. They not only tightly connect the various integrated valve blocks 2, ensuring the integrity of the entire integrated pipeline structure, but also effectively prevent loosening between the integrated valve blocks 2 due to vibration or other factors during the coating process, thus affecting the coating effect. Furthermore, the presence of connecting clamps 1 makes the assembly and disassembly of the integrated pipeline more convenient, allowing for quick replacement or adjustment of the integrated valve blocks 2 during equipment maintenance or upgrades, improving work efficiency. Two end clamps are respectively installed at the outer ends of the integrated valve blocks 2. One end clamp is equipped with a liquid inlet 28, a liquid outlet 29, and a spray gas inlet 30. The liquid inlet 28 is responsible for introducing the coating liquid, the liquid outlet 29 is used to discharge excess or recycled coating liquid, and the spray gas inlet 30 is used to input high-pressure gas to achieve liquid atomization. The other end clamp is equipped with a first liquid circulation port 31 and a second liquid circulation port 32, which are connected to the liquid inlet channel 21 and the liquid return channel 13 in the integrated valve block 2, forming a coating liquid circulation system. This ensures the continuous use of the coating liquid, avoids waste, and improves the economy and stability of the coating operation.

[0043] Please see Figures 1 to 6 The integrated pipeline also features an axially oriented control gas channel 11, located above the liquid inlet channel 21 and the liquid return channel 13. The control gas channel 11 connects sequentially to multiple nozzle assemblies 3 for synchronous control of their operation. This location above the liquid inlet channel 21 and the liquid return channel 13 optimizes the internal space of the pipeline and avoids interference with other channels. One end of the integrated pipeline equipped with the liquid pipe connector 5 and the gas pipe connector 6 is correspondingly equipped with a control gas connector 4, which connects to the control gas channel 11. The control gas channel 11 connects sequentially to multiple nozzle assemblies 3. By introducing or cutting off control gas into the control gas channel 11, the operation of multiple nozzle assemblies 3 can be synchronously controlled. When the nozzles need to be activated for coating operations, control gas enters the channel and acts on the corresponding control parts of each nozzle assembly 3. Conversely, when the control gas is cut off, each nozzle assembly 3 stops operating.

[0044] Please see Figure 2The nozzle assembly 3 includes a valve sleeve and a resilient valve core. The valve sleeve extends longitudinally and is embedded in the integrated pipe. A longitudinal channel is axially formed inside the valve sleeve. The liquid inlet port 12 is located on the outer wall of the valve sleeve and connects to the longitudinal channel. A valve cover 9 is provided at the upper end of the valve sleeve, and a top chamber connecting the valve cover 9 and the valve sleeve is formed between them. The resilient valve core includes a valve core body 22 that slides in the longitudinal channel. An elastic end is provided at the upper end of the valve core body 22. The elastic end is located in the top chamber and has a degree of freedom in the height direction. A control gas channel 11 is connected to the bottom of the top chamber. A valve needle 16 is provided at the lower end of the valve core body 22. The valve needle 16 and the longitudinal channel form a liquid spraying channel 18. The lower end of the valve needle 16 and the lower end of the longitudinal channel form a liquid discharge port.

[0045] As the core component of the integrated spray gun structure, the nozzle assembly 3, with its valve sleeve and flexible valve core working in concert, plays a decisive role in the coating effect. The valve sleeve runs longitudinally through and is tightly embedded within the integrated pipeline. This installation method ensures the stability of the connection between the nozzle assembly 3 and the integrated pipeline, preventing loosening or displacement during the coating process, thus ensuring the stability of the coating operation. The liquid inlet port 12 is located on the outer wall of the valve sleeve and communicates with the longitudinal channel. The coating liquid flows from the liquid inlet channel 21 of the integrated pipeline through the liquid inlet port 12 into the longitudinal channel, providing raw materials for subsequent spraying operations. The valve cover 9, located at the upper end of the valve sleeve, together with the valve sleeve, forms a top chamber. This chamber not only provides movement space for the flexible end of the flexible valve core but also connects to the control gas channel 11, making it a key component for controlling the start and stop of the nozzle assembly 3.

[0046] The valve core body 22 of the resilient valve core can slide longitudinally within the longitudinal channel. Its upper resilient end is located in the top cavity and has freedom in the height direction. When gas is introduced into the control gas channel 11, the control gas passes through the control gas and the longitudinally opened air inlet channel 10 on the valve sleeve, enters from the bottom of the resilient end, and pushes the resilient end upward. The valve needle 16 at the lower end of the valve core body 22 moves upward accordingly. The valve needle 16 and the longitudinal channel form a liquid spraying channel 18, which moves upward and connects to the liquid inlet port 12. The coating liquid can flow from the liquid outlet port into the liquid spraying channel 18 and finally be discharged from the liquid outlet port. At this time, the high-pressure gas sprayed from the spray gas path channel 14 atomizes the liquid discharged through the liquid outlet port, completing the coating operation. When the control gas supply stops, the resilient end is reset under the action of the spring 27, the valve core body 22 moves downward, and the liquid spraying channel 18 is no longer connected to the liquid inlet port 12, preventing the liquid from flowing out. Preferably, a second sealing ring 20 is provided around the outer periphery of the valve core body 22, which can increase the sealing between the valve core body 22 and the valve sleeve and prevent liquid from accidentally entering the top chamber from the top.

[0047] Furthermore, an upper sleeve 26 is provided at the upper end of the valve sleeve, and the valve sleeve is fitted around the outer periphery of the upper sleeve 26. The inner cavity of the upper sleeve 26 and the inner cavity of the valve cover 9 together form a top chamber. The lower end of the elastic end is fitted to the bottom of the inner cavity of the upper sleeve 26, and an air inlet channel 10 connecting to the control gas channel 11 is provided at the bottom of the upper sleeve 26. The top chamber provides movement space for the elastic end and ensures that the control gas can effectively act on the elastic end. During the coating operation, the control gas will generate an upward pushing force on the elastic end, lifting the elastic valve core, thereby controlling whether the nozzle assembly 3 sprays liquid. The lower end of the elastic end is fitted to the bottom of the inner cavity of the upper sleeve 26. This tight fit design ensures that the pressure of the control gas can be accurately transmitted to the elastic end. Under the action of the control gas, the elastic end can move flexibly in the top chamber, driving the elastic valve core to slide up and down. When the control gas pressure increases, the elastic end is lifted, the elastic valve core moves upward, and the spray channel 18 is opened; when the control gas pressure disappears, the elastic end is reset under the action of the spring 27, the elastic valve core moves downward, and the spray channel 18 is closed, ensuring that the nozzle assembly 3 can open and close in a timely manner according to the control gas command, so as to achieve precise control of the coating process.

[0048] Furthermore, the elastic end cap includes an end block 24, a first sealing ring 25, and a spring 27. The lower end of the end block 24 fits against the bottom of the inner cavity of the upper sleeve 26, providing a stable support base for the entire elastic end cap. The thrust generated by the control gas first acts on the end block 24. The end block 24 transmits this pressure to the connected spring 27 and valve core body 22, thereby pushing the valve core body 22 to drive the valve needle 16 to move, realizing the opening and closing control of the nozzle assembly 3. The first sealing ring 25 is fitted around the outer periphery of the end block 24. When the control gas pushes the end block 24 upward, the first sealing ring 25 can effectively prevent gas leakage into the top chamber, ensuring that the gas thrust can fully act on the end block 24 and drive the elastic valve core to move. The lower end of the spring 27 is fitted onto the upper end of the end block 24, and the lower end of the spring 27 abuts against the top of the inner cavity of the valve sleeve. When the control gas pushes the end block 24 upward, the spring 27 is compressed, storing elastic potential energy. Once the control gas supply stops, the spring 27 releases its own elastic potential energy, pushing the end block 24 to reset downwards, which in turn drives the valve core body 22 to move downwards, closing the liquid injection channel 18.

[0049] Furthermore, an upper sealing ring 23 and a lower sealing ring 19 are fitted around the outer periphery of the valve sleeve from top to bottom. The upper sealing ring 23 is located above the liquid inlet channel 21, and its function is to prevent the coating liquid in the liquid inlet channel 21 from leaking upwards. During the coating process, the liquid in the liquid inlet channel 21 is under a certain pressure. Without the upper sealing ring 23, the liquid may seep upwards along the gap between the valve sleeve and the integrated pipe, which would not only waste the coating liquid but also potentially contaminate other parts of the equipment, affecting the normal operation and service life of the equipment. The lower sealing ring 19 is located below the liquid inlet channel 21, and its main function is to prevent the liquid from leaking downwards. It effectively confines the liquid in the liquid inlet channel 21 to a specific area, ensuring that the liquid can only flow along the designed path and smoothly enter the spray channel 18 of the nozzle assembly 3. The coordinated work of these two sealing rings ensures the stable delivery of the coating liquid in the liquid inlet channel 21 and maintains the stability of the working environment of the nozzle assembly 3.

[0050] Furthermore, the lower end of the valve sleeve is provided with a tapered end, and the lower end of the tapered end is provided with a necked section. The bottom of the spray gas passage 14 is provided with multiple tapered holes, and the lower end of each tapered hole is provided with a straight hole section. The tapered end is coaxially inserted into the corresponding tapered hole, forming a first spray gas gap 15 between the tapered end and the tapered hole. The tapered end at the lower end of the valve sleeve precisely matches the tapered hole at the bottom of the spray gas passage 14, forming the first spray gas gap 15 after coaxial insertion. This structural design causes changes in the velocity and pressure distribution of the high-pressure gas entering from the spray gas passage 14 as it flows through the tapered gap. The gas velocity increases and the pressure decreases in the gradually narrowing tapered gap, forming a high-speed airflow. This high-speed airflow can generate strong shear force and suction on the coated liquid discharged from the drain port, dispersing the liquid into fine droplets, laying the foundation for the subsequent atomization process. The necked section is coaxially inserted and penetrates the straight hole section, forming a second spray gas gap 17 between the necked section and the straight hole section. After the high-pressure gas passes through the first spray gas gap 15, it enters the second spray gas gap 17. The gas is further accelerated in the second spray gas gap 17, forming a stable airflow. This stable, high-speed airflow can perform secondary atomization on the initially dispersed droplets, making the droplets finer and more uniform. Simultaneously, the second spray gas gap 17 also guides the gas and liquid to mix thoroughly, ensuring that the atomized droplets are evenly sprayed under the carrying force of the gas, thus achieving a high-quality coating effect. The first spray gas gap 15 connects to the second spray gas gap 17. The first and second spray gas gaps are interconnected, forming a continuous gas flow channel. This interconnected structure allows the high-pressure gas to flow smoothly between the two gaps, achieving continuous atomization of the coating liquid. Throughout the atomization process, the coordinated work of the two gaps ensures stable gas pressure and flow rate, avoiding uneven atomization caused by poor gas flow or pressure fluctuations.

[0051] Based on the same inventive concept, this utility model also provides a coating machine. Since the coating machine uses the above-mentioned integrated spray gun structure, it has the same beneficial effects as the integrated spray gun structure, which will not be described in detail here.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated spray gun structure, characterized in that, include: An integrated pipeline is provided with an axially arranged inlet liquid passage (21), return liquid passage (13) and spray gas passage (14). The inlet liquid passage (21) and the return liquid passage (13) are both located above the spray gas passage (14). One end of the inlet liquid passage (21) is connected to the same end of the return liquid passage (13). The lower end of the spray gas passage (14) is provided with a jet port. Multiple nozzle assemblies (3) are arranged sequentially along the axial direction of the integrated pipe. The nozzle assemblies (3) penetrate from top to bottom and are embedded in the integrated pipe. The nozzle assemblies (3) have a spray channel (18) axially opened inside. The upper end of the spray channel (18) is provided with a liquid inlet port (12) that connects to the liquid inlet channel (21). The lower end of the spray channel (18) is provided with a liquid outlet port that passes through the jet port. The jet port provides high-pressure gas to atomize the liquid discharged from the liquid outlet port and spray it outward.

2. The integrated spray gun structure as described in claim 1, characterized in that, One end of the integrated pipe is provided with a liquid inlet (28), a liquid outlet (29), and a spray gas inlet (30). The liquid inlet (28) is connected to the liquid inlet channel (21), the liquid outlet (29) is connected to the liquid return channel (13), and the spray gas inlet (30) is connected to the spray gas channel (14). The other end of the integrated pipe is provided with a first liquid circulation port (31) and a second liquid circulation port (32) that are connected to each other. The first liquid circulation port (31) is connected to the liquid inlet channel (21), and the second liquid circulation port (32) is connected to the liquid return channel (13).

3. The integrated spray gun structure as described in claim 2, characterized in that, The integrated pipeline includes: Multiple integrated valve blocks (2) are arranged axially in sequence. The liquid inlet channel (21), liquid return channel (13) and spray air channel (14) are all opened in the axial direction of the integrated valve block (2). At least one nozzle assembly (3) is provided on the integrated valve block (2). Multiple connecting clamps (1) are connected between adjacent integrated valve blocks (2); Two end clamps are respectively set at the outer ends of the integrated valve blocks (2) at both ends. The liquid inlet (28), liquid outlet (29) and spray gas inlet (30) are set on one end clamp, and the first liquid circulation port (31) and the second liquid circulation port (32) are set on the other end clamp.

4. The integrated spray gun structure as described in claim 1, characterized in that, The integrated pipeline is also provided with an axially oriented control gas channel (11), which is located above the liquid inlet channel (21) and the liquid return channel (13). The control gas channel (11) is connected to multiple nozzle assemblies (3) in sequence to synchronously control the start and stop of multiple nozzle assemblies (3).

5. The integrated spray gun structure as described in claim 4, characterized in that, The nozzle assembly (3) includes: A valve sleeve is longitudinally inserted and embedded in the integrated pipe. A longitudinal channel is axially opened inside the valve sleeve. The liquid inlet port (12) is opened on the outer wall of the valve sleeve and communicates with the longitudinal channel. A valve cover (9) is provided at the upper end of the valve sleeve. A top chamber communicating with the longitudinal channel is formed between the valve cover (9) and the valve sleeve. The elastic valve core includes a valve core body (22) that slides within the longitudinal channel. The upper end of the valve core body (22) is provided with an elastic end. The elastic end is located in the top chamber and has a degree of freedom in the height direction. The control gas channel (11) is connected to the bottom of the top chamber. The lower end of the valve core body (22) is provided with a valve needle (16). The valve needle (16) and the longitudinal channel form the liquid spraying channel (18). The lower end of the valve needle (16) and the lower end of the longitudinal channel form the liquid discharge port.

6. The integrated spray gun structure as described in claim 5, characterized in that, The upper end of the valve sleeve is provided with an upper end sleeve (26), and the valve sleeve is fitted on the outer periphery of the upper end sleeve (26). The inner cavity of the upper end sleeve (26) and the inner cavity of the valve cover (9) together form the top chamber. The lower end of the elastic end is attached to the bottom of the inner cavity of the upper end sleeve (26). The bottom of the upper end sleeve (26) is provided with an air inlet channel (10) that connects to the control gas channel (11).

7. The integrated spray gun structure as described in claim 6, characterized in that, The elastic end includes: End block (24), the lower end of which is attached to the bottom of the inner cavity of the upper end sleeve (26); The first sealing ring (25) is fitted onto the outer periphery of the end block (24); A spring (27) is provided, with its lower end fitted onto the upper end of the end block (24) and its lower end abutting against the top of the valve sleeve cavity.

8. The integrated spray gun structure as described in claim 5, characterized in that, The valve sleeve is fitted with an upper sealing ring (23) and a lower sealing ring (19) from top to bottom on its outer periphery. The upper sealing ring (23) is located above the liquid inlet channel (21), and the lower sealing ring (19) is located below the liquid inlet channel (21).

9. The integrated spray gun structure as described in claim 5, characterized in that, The lower end of the valve sleeve is provided with a tapered end, and the lower end of the tapered end is provided with a necked section. The bottom of the spray gas passage (14) is provided with a plurality of tapered holes, and the lower end of the tapered holes is provided with a straight hole section. The tapered end is coaxially inserted into the corresponding tapered hole, and a first spray gas gap (15) is formed between the tapered end and the tapered hole. The necked section is coaxially inserted into and passes through the straight hole section, and a second spray gas gap (17) is formed between the necked section and the straight hole section. The first spray gas gap (15) is connected to the second spray gas gap (17).

10. A coating machine, characterized in that, Includes the integrated spray gun structure as described in any one of claims 1-9.

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