Spray valve and spraying method thereof

Abstract

The invention belongs to the technical field of spray valves, and particularly relates to a spray valve and a spraying method thereof.The spray valve comprises a main valve body, an air control module and a feeding assembly, a first air cavity, a second air cavity, a liquid inlet cavity and a glue outlet communicated with the liquid inlet cavity are formed in the main valve body, and a piston firing pin capable of opening and closing the glue outlet is arranged in the main valve body; the pneumatic control module is installed on the main valve body, the feeding assembly introduces glue liquid to the glue outlet, the valve opening electromagnetic valve is opened to convey gas into the first gas cavity so as to push the piston firing pin to move upwards, and then the glue outlet is opened; and the atomization electromagnetic valve is started to convey gas into the second gas cavity, so that the glue liquid at the glue outlet is atomized. The pneumatic control module is directly integrated on the main valve body, so that the length of a gas path is shortened, the delay time of gas supply relative to glue discharge is shortened, the time difference of gas-liquid supply is obviously reduced, full mixing of gas-liquid two-phase flow is facilitated, the glue atomization effect is improved, and the gluing quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of spray valves, and in particular to a spray valve and a spraying method thereof. Background Art

[0002] In the field of industrial manufacturing, fluid atomization technology is a key link in realizing processes such as uniform coating of materials and precision machining. Traditional spray technologies (such as pressure nozzles and air-assisted nozzles) meet the basic spray requirements to a certain extent. However, there are still problems such as high energy consumption, uneven atomization particles, and limited adjustment range. In recent years, with the improvement of the requirements for precision manufacturing and energy conservation and environmental protection, two-phase flow spray technology, through the mixing and atomization process of gas-liquid two-phase flow, can achieve efficient and uniform fluid dispersion, and is widely used in many fields such as industrial spraying, electronic packaging coating, fuel injection, agricultural irrigation, and medical spray.

[0003] In the prior art, the gas path control module is located in the machine control cabinet. The gas path control module is connected to the spray valve through a long air pipe. When the controller located in the machine control cabinet sends a spraying signal to the gas path control module, the gas path control module supplies gas to the spray valve through a long air pipe (usually about 1m long air pipe). During the whole process, due to the long transmission path that the gas needs to pass through, there is a long time when the gas enters the spray valve. The gas supply is prone to delay compared with the glue discharging, and the full mixing of gas-liquid two-phase flow cannot be achieved, resulting in an imbalance in the gas-liquid ratio, uneven glue coating, and affecting the atomization effect of the glue; and the glue discharging amount of the spray valve cannot be accurately controlled, and glue overflow is likely to occur during glue coating. Summary of the Invention

[0004] The technical problem solved by the present invention is: the problem that the gas supply is delayed compared with the glue discharging due to the long gas path.

[0005] To this end, the present invention provides a spray valve and a spraying method thereof, which have the technical effects of shortening the gas path length and reducing the time difference between gas-liquid supply, improving the gas-liquid mixing uniformity and atomization effect.

[0006] The spray valve according to an embodiment of the present invention includes: A main valve body, in which a first gas chamber, a second gas chamber, and a liquid inlet chamber are provided. The main valve body has a glue discharging port communicating with the liquid inlet chamber. The air outlet end of the second gas chamber surrounds the glue discharging port to form an annular air channel. A piston striker that can move up and down and a return spring that urges the piston striker to move downward are installed in the main valve body. The upper end of the piston striker is located in the first gas chamber, and the lower end of the piston striker extends into the liquid inlet chamber and can open and close the glue discharging port; Air control module, the air control module includes an open valve solenoid valve and an atomizing solenoid valve, both the open valve solenoid valve and the atomizing solenoid valve are installed on the main valve body, the open valve solenoid valve is communicated with the first air chamber, and the atomizing solenoid valve is communicated with the second air chamber; Feeding assembly, the feeding assembly is installed on the main valve body, and the feeding assembly conveys glue to the liquid inlet chamber; Among them, opening the open valve solenoid valve to convey gas into the first air chamber to push the piston striker to move upward, thereby opening the glue outlet; Opening the atomizing solenoid valve to convey gas into the second air chamber, and the gas passing through the annular air passage atomizes the glue at the glue outlet.

[0007] The beneficial effect of the present invention is that by directly integrating the air control module (including the open valve solenoid valve and the atomizing solenoid valve) on the main valve body, this fast response mechanism with a short air path significantly shortens the path and time from the opening of the air control module to the gas entering the main valve body, thereby reducing the delay time of gas supply relative to glue discharge, significantly reducing the time difference between gas and liquid supply, facilitating the full mixing of gas-liquid two-phase flow, improving the glue atomization effect, and improving the glue application quality; and improving the response speed of the piston striker, enabling more precise control of the opening and closing of the glue outlet, and avoiding the phenomena of lack of glue and glue overflow.

[0008] According to an embodiment of the present invention, the air control module further includes a double-valve flow guide plate, the double-valve flow guide plate is arranged between the main valve body and the air control module, a first air inlet joint and a second air inlet joint are installed on the double-valve flow guide plate, and a first flow guide channel Ⅰ for connecting the open valve solenoid valve and the first air inlet joint, a first flow guide channel Ⅱ for connecting the open valve solenoid valve and the first air chamber, a second flow guide channel Ⅰ for connecting the atomizing solenoid valve and the second air inlet joint, and a second flow guide channel Ⅱ for connecting the atomizing solenoid valve and the second air chamber are opened in the double-valve flow guide plate. Thus, by setting the double-valve flow guide plate and opening a plurality of flow guide channels in the double-valve flow guide plate to guide the open valve gas and the atomizing gas.

[0009] According to an embodiment of the present invention, a first muffler and a second muffler are installed on the double-valve flow guide plate, and a first flow guide channel Ⅲ for connecting the open valve solenoid valve and the first muffler and a second flow guide channel Ⅲ for connecting the atomizing solenoid valve and the second muffler are opened in the double-valve flow guide plate. Thus, the first flow guide channel Ⅲ is set to guide the open valve gas in the main valve body through the first flow guide channel Ⅲ to be discharged after spraying, and the second flow guide channel Ⅲ is set to guide the atomizing gas in the main valve body through the second flow guide channel Ⅲ to be discharged after spraying, and cooperate with the first muffler and the second muffler to reduce the noise during exhaust.

[0010] According to an embodiment of the present invention, the pneumatic control module is installed on the main valve body along a first direction, and the feeding assembly is installed on the main valve body along a second direction, and the first direction is perpendicular to the second direction. Thus, the volume of the main valve body in the first direction is reduced, interference between the feeding assembly and other modules (such as a vision detection module) during the moving operation of the main valve body is prevented, and it is more conducive to material replacement when the feeding assembly is installed in front of the main valve body.

[0011] According to an embodiment of the present invention, the main valve body includes: a piston cylinder, a fluid tank, and an atomization assembly connected in sequence, A piston chamber is provided in the piston cylinder, and the piston end of the piston striker is movably arranged up and down in the piston chamber and divides the piston chamber into an upper chamber and the first air chamber. An exhaust hole communicating with the upper chamber is provided on the piston cylinder; The rod body of the piston striker passes through the fluid tank, and the impact end of the piston striker extends into the atomization assembly. The glue in the liquid inlet chamber flows into the atomization assembly, and the glue outlet is provided on the atomization assembly. Thus, when the piston striker moves upward, the volume of the first air chamber increases and the volume of the upper chamber decreases. By providing the exhaust hole, the gas in the upper chamber can be discharged when the piston striker moves upward.

[0012] According to an embodiment of the present invention, a snap ring is provided in the upper chamber, and the snap ring is located above the piston striker to limit the upward movement of the piston striker. Thus, by providing a snap ring above the piston striker, the maximum stroke of the piston striker's movement can be restricted. When the piston striker is pushed upward by gas to the limit position, the upper end of the piston striker will abut against the snap ring.

[0013] According to an embodiment of the present invention, a sealing assembly is provided at the connection between the piston cylinder and the fluid tank. The sealing assembly is sleeved around the rod body of the piston striker and is used to prevent the gas in the first air chamber from communicating with the glue in the liquid inlet chamber.

[0014] According to an embodiment of the present invention, the atomization assembly includes: a needle seat and a spray cap, The glue outlet is provided on the needle seat. The rod body of the piston striker passes through the fluid tank, and the impact end of the piston striker extends into the needle seat; The spray cap is sleeved outside the needle seat and is tightly and fixedly connected to the needle seat. A second air chamber is formed between the spray cap and the needle seat. The second air chamber includes a primary homogenizing air passage, a secondary homogenizing air passage, and an atomizing orifice that are interconnected. The atomizing orifice surrounds the glue outlet and is coaxially arranged. Thus, by designing the primary homogenizing air passage and the secondary homogenizing air passage, a two-stage air flow homogenizing structure is constructed. The primary homogenizing air passage preliminarily homogenizes the atomizing gas, and the secondary homogenizing air passage further homogenizes the air flow distribution. In the scenarios of low pressure or high-viscosity fluids, low gas consumption is maintained and atomization is uniform.

[0015] According to an embodiment of the present invention, the spray valve further includes a heating module. The heating module is detachably mounted outside the main valve body and is used to heat the glue. Thus, in the spraying operation of high-viscosity glue, by providing the heating module, the viscosity of the glue can be effectively reduced, making it easier to flow and atomize, thereby improving the uniformity of spraying. When the heated glue is mixed with the atomizing gas, it can interact more fully with the atomizing gas, forming finer droplets, and improving the atomization effect and uniformity of the glue.

[0016] A spraying method for a spray valve, which is applicable to the spray valve described in any one of the above, and the spraying method includes the following steps: Step S1: The feeding assembly conveys glue to the liquid inlet chamber; Step S2: Open the valve-opening solenoid valve to convey gas to the first air chamber, and the piston striker of the main valve body opens the glue outlet; Step S3: Open the atomizing solenoid valve to convey gas to the second air chamber, and atomize the glue discharged from the glue outlet. Among them, the order of opening and closing the valves is as follows: The valve-opening order is to first open the atomizing solenoid valve to convey gas to the second air chamber, and then open the valve-opening solenoid valve to convey gas to the first air chamber. The piston striker of the main valve body opens the glue outlet. Thus, it is ensured that before the glue outlet is opened (i.e., the glue is discharged from the glue outlet), the atomizing gas has been conveyed to the second air chamber, solving the problem of no atomization effect during the glue discharging stage; The valve-closing order is to first close the valve-opening solenoid valve, the piston striker of the main valve body closes the glue outlet, and then close the atomizing solenoid valve. Thus, it is ensured that there is still atomizing gas in the second air chamber before the glue outlet is closed, solving the problem of no atomization effect during the glue discharging stage.

[0017] According to an embodiment of the present invention, the spray valve further includes a double-valve deflector. The double-valve deflector is installed on the main valve body. Both the valve-opening solenoid valve and the atomizing solenoid valve are installed on the double-valve deflector. The double-valve deflector has a first diversion channel II for connecting the first air chamber and the valve-opening solenoid valve and a second diversion channel II for connecting the atomizing solenoid valve and the second air chamber.

[0018] Other features and advantages of the present invention will be described in the following specification, and in part will become apparent from the specification, or may be learned by practicing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structure particularly pointed out in the specification, claims and drawings.

[0019] To make the above objectives, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 Structural schematic diagram of the spray valve for Embodiment 1; Figure 2 is Figure 1 top view of Figure 3 is Figure 2 cross-sectional view taken along line A-A in Figure 4 is Figure 2 cross-sectional view taken along line B-B in Figure 5 Structural schematic diagram of the main valve body for Embodiment 1; Figure 6 Structural schematic diagram of the installation of the pneumatic control module and the double-valve deflector for Embodiment 1; Figure 7 is Figure 6 internal structural schematic diagram of Figure 8 is Figure 6 internal structural cross-sectional view from another perspective; Figure 9 is Figure 3 partial enlarged schematic view at C in Figure 10 is Figure 4 partial enlarged schematic view at D in Figure 11 is Figure 4 partial enlarged schematic view at E in Figure 12 is Figure 11 cross-sectional view taken along line F-F in Figure 13 is Figure 11 cross-sectional view taken along line G-G in Figure 14 is Figure 11 partial enlarged schematic view at K in Figure 15 Structural schematic diagram of the piston striker for Embodiment 1; Figure 16 Schematic structural diagram of the heating module in Embodiment 1; Figure 17 It is Figure 16 Cross-sectional view taken along line H-H in Figure 18 Schematic internal structure diagram of the atomizing assembly in Embodiment 2; Figure 19 It is Figure 18 Cross-sectional view taken along line I-I in Figure 20 It is Figure 18 Cross-sectional view taken along line J-J in Figure 21 Schematic structural diagram of the homogenizing block in Embodiment 2; Figure 22 Schematic internal structure diagram of the external atomization structure in Embodiment 3; Figure 23 Schematic structural diagram of the piston striker in Embodiment 4; Figure 24 Schematic internal structure diagram of the piston striker in Embodiment 4; Figure 25 Schematic diagram of the principle of the spray valve of the present invention.

[0022] In the figure: 1, main valve body; 101, first air chamber; 102, liquid inlet chamber; 103, glue outlet; 104, piston striker; 105, return spring; 106, secondary gasket; 107, leak-proof gasket; 108, liquid inlet flow channel; 109, cylinder upper cover; 110, piston cylinder; 111, fluid groove; 112, atomizing assembly; 113, feed joint; 114, sealing plug; 115, fixing nut; 116, fourth O-ring; 117, fifth O-ring; 118, sealing assembly; 119, micrometer; 120, first O-ring; 121, exhaust hole; 122, snap ring; 123, second air chamber; 124, upper chamber; 1011, first air inlet flow channel; 1012, lower chamber; 1013, first through hole; 1031, sealing port; 1032, injection port; 1033, turbulent flow channel; 1041, piston; 1042, striker; 1043, flange cover; 1044, fastening screw; 1121, spray cap; 1122, atomizing port; 1123, primary homogenizing air channel; 1124, secondary homogenizing air channel; 1125, needle seat body; 1126, needle; 1127, second air inlet flow channel; 1128, homogenizing block; 1181, second O-ring; 1182, pantograph mounting block; 1183, pantograph seal; 1184, third O-ring; 1185, first leakage hole; 1186, second leakage hole; 2, pneumatic control module; 201, valve opening solenoid valve; 202, atomizing solenoid valve; 203, wire outlet seat; 204, signal viewing window plate; 3, feeding assembly; 4. Heating module; 401. Cavity heating block; 402. Junction box; 403. Cable locking seat; 404. Heating rod; 405. Platinum resistance; 406. Quick-release screw 5. Double-valve deflector; 501. First silencer; 502. First intake pipe joint; 503. Second silencer; 504. Second intake pipe joint; 505. First diversion channel I; 506. First diversion channel II; 507. First diversion channel III; 508. Second diversion channel I; 509. Second diversion channel II; 510. Second diversion channel III 6. First intake pipe; 7. Second intake pipe Detailed implementation manners

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, and thus only showing the components related to the present invention

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations

[0026] As Figures 1 to 17 shown, it is the preferred embodiment 1 of the present invention. The spray valve of this embodiment includes: a main valve body 1, a pneumatic control module 2, and a feeding assembly 3 Inside the main valve body 1, a first air chamber 101, a second air chamber 123, and a liquid inlet chamber 102 are provided. The main valve body 1 has a glue outlet 103 communicating with the liquid inlet chamber 102. The air outlet end of the second air chamber 123 surrounds the glue outlet 103 to form an annular air passage. Inside the main valve body 1, a piston punch 104 that can move up and down and a return spring 105 that urges the piston punch 104 to move downward are installed. The upper end of the piston punch 104 is located inside the first air chamber 101, and the lower end of the piston punch 104 extends into the liquid inlet chamber 102 and can open and close the glue outlet 103; The air control module 2 includes an open valve solenoid valve 201 and an atomizing solenoid valve 202. The open valve solenoid valve 201 and the atomizing solenoid valve 202 are both installed on the main valve body 1 and form an integrated structure. The open valve solenoid valve 201 communicates with the first air chamber 101, and the atomizing solenoid valve 202 communicates with the second air chamber 123; The feeding assembly 3 is installed on the main valve body 1, and the feeding assembly 3 conveys glue to the liquid inlet chamber 102; Among them, when the open valve solenoid valve 201 is opened to convey gas into the first air chamber 101 to push the piston punch 104 to move upward, thereby opening the glue outlet 103; when the atomizing solenoid valve 202 is opened to convey gas into the second air chamber 123, the gas passing through the annular air passage and the glue are mixed at the glue outlet 103. Since the gas flow rate is greater than the glue flow rate, the glue is torn from the liquid column to form tiny droplets, and a spray is formed and sprayed onto the product surface.

[0027] Specifically, the spray valve is installed on the dispensing platform, and a spraying signal is sent to the spray valve through the upper computer of the control cabinet, and the spray valve performs dispensing operations.

[0028] In the present invention, the air control module 2 is directly connected to the main valve body 1, reducing the path length of gas flow and greatly improving the response speed. This fast response mechanism with a short air path enables the main valve body 1 to more precisely control the opening and closing of the glue outlet 103, thereby achieving precise regulation of the flow rate.

[0029] In terms of weight, the weight of the main valve body 1 in the prior art is about 300 g. When the air control module 2 is integrated into the main valve body 1, the overall weight of the spray valve increases to about 800 g. Although this integrated design increases the counterweight and volume of the main valve body 1 to a certain extent, resulting in an increase of several hundred grams in the load weight of the dispensing platform, this increase has a minimal impact on the moving performance of the dispensing platform and the spraying quality. More importantly, the integrated design of the present invention solves the key problems in the prior art, such as insufficient mixing uniformity of the gas-liquid two-phase flow due to a long air path and the inability to precisely control the glue output of the spray valve.

[0030] In the prior art, the pneumatic control module 2 is located in the machine tool control cabinet and needs to be connected to the main valve body 1 through a relatively long air pipe (usually an air pipe about 1 m long). During the gas transmission process, due to the too long path of the air pipe, it takes a long time for the gas to enter the spray valve. The gas supply is prone to delay compared with the glue dispensing. In the present invention, the pneumatic control module 2 is directly installed on the main valve body 1, and the gas transmission path is shortened from 1 m to almost zero. The gas transmission is no longer limited by the length of the air pipe. After the pneumatic control module 2 receives the spraying signal sent by the controller in the machine tool control cabinet, the atomizing solenoid valve 202 is opened, and the gas is directly transported into the second air chamber 123, reducing the delay time of the gas supply relative to the glue dispensing, significantly reducing the time difference between the gas and liquid supplies, facilitating the full mixing of the gas-liquid two-phase flow, improving the atomization effect of the glue liquid, and improving the glue application quality; the valve opening solenoid valve 201 is opened, and the gas is directly transported into the first air chamber 101, improving the response speed of the piston needle 104, enabling more precise control of the opening and closing of the glue outlet, and avoiding the phenomena of lack of glue (that is, when the glue outlet has not been opened and the glue liquid has not been ejected from the glue outlet 103, the dispensing platform has driven the spray valve to perform the dispensing action according to the dispensing trajectory, resulting in lack of glue on some surfaces of the product) and glue overflow (that is, when the dispensing platform has driven the spray valve to perform the stop dispensing action, the glue outlet of the spray valve has not been closed yet, resulting in glue overflow on the product surface).

[0031] In this embodiment, the spray valve further includes a double-valve flow guide plate 5. The double-valve flow guide plate 5 is arranged between the main valve body 1 and the pneumatic control module 2. A first air inlet joint 502 and a second air inlet joint 504 are installed on the double-valve flow guide plate 5. The first air pipe 6 is connected to the first air inlet joint 502, and the second air pipe 7 is connected to the second air inlet joint 504. A first flow guide channel Ⅰ505 for connecting the valve opening solenoid valve 201 and the first air inlet joint 502, a first flow guide channel Ⅱ506 for connecting the valve opening solenoid valve 201 and the first air chamber 101, a second flow guide channel Ⅰ508 for connecting the atomizing solenoid valve 202 and the second air inlet joint 504, and a second flow guide channel Ⅱ509 for connecting the atomizing solenoid valve 202 and the second air chamber 123 are formed in the double-valve flow guide plate 5. Thus, by providing the double-valve flow guide plate 5 and forming a plurality of flow guide channels in the double-valve flow guide plate 5 to guide the valve opening gas and the atomizing gas.

[0032] In this embodiment, a first silencer 501 and a second silencer 503 are installed on the double-valve deflector 5. A first diversion channel III 507 for connecting the open-valve solenoid valve 201 and the first silencer 501 and a second diversion channel III 510 for connecting the atomizing solenoid valve 202 and the second silencer 503 are formed inside the double-valve deflector 5. Thus, the first diversion channel III 507 is provided to guide the open-valve gas in the main valve body 1 out through the first diversion channel III 507 after spraying, and the second diversion channel III 510 is provided to guide the atomizing gas in the main valve body 1 out through the second diversion channel III 510 after spraying, and the first silencer 501 and the second silencer 503 are coordinated to reduce the noise during exhaust.

[0033] In this embodiment, the open-valve solenoid valve 201 and the atomizing solenoid valve 202 are arranged in parallel on the double-valve deflector 5, which is beneficial for wiring. The open-valve solenoid valve 201 and the atomizing solenoid valve 202 are both two-position three-way solenoid valves. Specifically, as shown in Figure 7 , Figure 8 and Figure 25 For example, the open-valve solenoid valve 201 has three mutually connected air holes, namely a first air hole, a second air hole and a third air hole. The first air hole is connected to the first air inlet joint 502 through the first diversion channel I 505, the second air hole is connected to the first air chamber 101 through the first diversion channel II 506, and the third air hole is connected to the first silencer 501 through the first diversion channel III 507. The specific working principle is as follows: The gas enters the first diversion channel I 505 from the first air inlet joint 502 and stops at the first air hole. At this time, the open-valve solenoid valve 201 is in the closed state. After the open-valve solenoid valve 201 receives the spraying signal, the open-valve solenoid valve 201 opens, and the gas enters the first air chamber 101 from the first air hole through the second air hole and the first diversion channel II 506 in sequence. After the open-valve solenoid valve 201 receives the stop signal and the open-valve solenoid valve 201 closes, the gas in the first air chamber 101 passes through the first diversion channel II 506, the second air hole, the third air hole and the first diversion channel III 507 in sequence and is discharged from the first silencer 501. The working principle of the atomizing solenoid valve 202 is the same as that of the open-valve solenoid valve 201, and no further examples will be given here.

[0034] In this embodiment, the pneumatic control module 2 further includes: An outlet seat 203, which covers the open-valve solenoid valve 201 and the atomizing solenoid valve 202, is used to receive and regularize the electrical lines related to the open-valve solenoid valve 201 and the atomizing solenoid valve 202, and plays a role in isolating the external environment and avoiding damage to the lines; A signal window plate 204, which is installed on the outlet seat 203, is beneficial for line maintenance.

[0035] In this embodiment, the pneumatic control module 2 is installed on the main valve body 1 along the first direction, and the feeding assembly 3 is installed on the main valve body 1 along the second direction. The first direction is perpendicular to the second direction. Thus, the volume of the main valve body 1 in the first direction is reduced, and interference between the feeding assembly 3 and other modules (such as the vision detection module) during the moving operation of the main valve body 1 is prevented. Moreover, the feeding assembly 3 is installed in front of the main valve body 1, which is more conducive to replacing the glue in the glue supply barrel of the feeding assembly 3.

[0036] In this embodiment, the main valve body 1 includes: a cylinder upper cover 109, a piston cylinder 110, a fluid tank 111, and an atomization assembly 112 that are connected in sequence. The pneumatic control module 2 is installed on the piston cylinder 110. A piston chamber is provided in the piston cylinder 110. The piston end of the piston striker 104 is movably disposed in the piston chamber and divides the piston chamber into an upper chamber 124 and a first air chamber 101. An exhaust hole 121 communicating with the upper chamber 124 is provided on the piston cylinder 110. The exhaust hole 121 extends from the outer wall of the main valve body 1 into the upper chamber 124. A snap ring 122 is provided in the upper chamber 124. The snap ring 122 is located above the piston striker 104 to limit the upward movement of the piston striker 104. The first air chamber 101 includes a first air inlet flow channel 1011, a lower chamber 1012, and a first through hole 1013. The piston end of the piston striker 104 is movably disposed in the lower chamber 1012. The rod body of the piston striker 104 sequentially passes through the first through hole 1013 and the fluid tank 111, and the impact end of the piston striker 104 extends into the atomization assembly 112. The first air inlet flow channel 1011 is used to connect the lower chamber 1012 and the first diversion channel II 506. When the piston striker 104 moves upward, the volume of the lower chamber 1012 increases, and the volume of the upper chamber 124 decreases. The exhaust hole 121 is provided to discharge the gas in the upper chamber 124 when the piston striker 104 moves upward. The liquid inlet chamber 102 extends from the fluid tank 111 into the atomization assembly 112. A feed joint 113 is provided on one side of the fluid tank 111. The feeding assembly 3 is installed on the feed joint 113. A liquid inlet flow channel 108 is provided inside one side of the fluid tank 111. The liquid inlet flow channel 108 is used to connect the feed joint 113 and the liquid inlet chamber 102. A sealing plug 114 is provided at one end of the liquid inlet flow channel 108 away from the liquid inlet chamber 102. The atomization assembly 112 includes: a needle seat and a spray cap 1121. The needle seat is threadedly connected to the fluid tank 111. The spray cap 1121 is hermetically installed at the lower end of the fluid tank 111 through a fixing nut 115. The spray cap 1121 is sleeved outside the needle seat and is tightly fitted with the needle seat. There is a primary homogenizing air passage 1123 between the upper end of the needle seat and the spray cap 1121, and a secondary homogenizing air passage 1124 between the lower end of the needle seat and the spray cap 1121. An atomization port 1122 is provided at the lower end of the spray cap 1121. The atomization port 1122 surrounds the glue outlet 103 and is coaxially arranged. There is a first homogenizing cavity between the primary homogenizing air passage 1123 and the secondary homogenizing air passage 1124. The inner wall surface of the first homogenizing cavity includes a first conical surface with a gradually decreasing inner diameter. There is a second homogenizing cavity between the secondary homogenizing air passage 1124 and the atomization port 1122. The inner wall surface of the second homogenizing cavity includes a second conical surface with a gradually decreasing inner diameter. The second air cavity 123 includes a second air inlet passage 1127, a primary homogenizing air passage 1123, a first homogenizing cavity, a secondary homogenizing air passage 1124, a second homogenizing cavity, and an atomization port 1122 that are sequentially connected. The second air inlet passage 1127 penetrates through the fluid tank 111 from the piston cylinder 110 and extends into the spray cap 1121. Thus, by designing the primary homogenizing air passage 1123 and the secondary homogenizing air passage 1124, a two-stage air flow homogenizing structure is constructed. The primary homogenizing air passage 1123 preliminarily homogenizes the atomizing gas, and the secondary homogenizing air passage 1124 further homogenizes the air flow distribution, maintaining low air consumption and uniform atomization in low-pressure or high-viscosity fluid scenarios.

[0037] Specifically, the spray cap 1121 is connected to the lower end of the fluid tank 111 through a fixing nut 115, so that the upper end surface of the spray cap 1121 is in direct contact with the lower end surface of the fluid tank 111 to form a seal.

[0038] In this embodiment, a first O-ring 120 is sleeved outside the upper end of the piston striker 104. By setting the first O-ring 120, the sealing performance is increased to prevent the gas introduced into the first air cavity 101 from leaking into the upper cavity 124, thus affecting the stability of the gas pushing the piston striker 104 to move.

[0039] In this embodiment, refer to Figure 9As shown, two fourth O-rings 116 are provided at the connection between the piston cylinder 110 and the pneumatic control module 2. One fourth O-ring 116 is located at the connection between the first intake air flow channel 1011 and the first diversion channel II 506 to prevent the valve-opening air from leaking from the connection between the piston cylinder 110 and the pneumatic control module 2. The other fourth O-ring 116 is located at the connection between the second intake air flow channel 1127 and the second diversion channel II 509 to prevent the atomized air from leaking from the connection between the piston cylinder 110 and the pneumatic control module 2. A fifth O-ring 117 is provided at the connection between the piston cylinder 110 and the fluid tank 111. The fifth O-ring 117 is sleeved outside the second intake air flow channel 1127 to prevent the atomized air from leaking from the connection between the piston cylinder 110 and the fluid tank 111.

[0040] In this embodiment, the piston striker 104 includes a piston 1041 and a striker 1042. The piston 1041 and the striker 1042 are of an integral structure. The piston 1041 is disposed in the first air chamber 101. The rod body of the striker 1042 passes through the fluid tank 111, and the impact end of the striker 1042 extends into the atomization assembly 112.

[0041] In this embodiment, the needle seat includes a needle seat body 1125 and a needle 1126. The needle seat body 1125 is threadedly connected to the fluid tank 111. The glue outlet 103 is disposed at the lower end of the needle 1126. A needle gasket is provided between the needle seat body 1125 and the needle 1126. Thus, the needle seat body 1125 and the needle 1126 adopt a split design. The aperture of the glue outlet 103 of the needle 1126 can be designed in various specifications (for example: the aperture of the glue outlet 103 is 0.1mm, 0.2mm, 0.3mm, etc.). The needle 1126 can be replaced only according to the spraying requirements, and only the needle 1126 needs to be processed. The part processing cost, cycle, and difficulty are all lower than those of the integral structure. Specifically, according to actual production needs, the needle 1126 can be made of different materials (for example: the needle 1126 is a tungsten steel needle or a ceramic needle, etc.); since the direct contact seal between the two metal parts of the needle seat body 1125 and the needle 1126 requires high part precision, the needle gasket serves to seal the needle seat body 1125 and the needle 1126, reducing the part precision requirements. And because the needle gasket has a certain elasticity, while ensuring the seal, it can make the upper end surface of the spray cap 1121 directly contact and seal with the lower end surface of the fluid tank 111.

[0042] In this embodiment, a leak-proof gasket 107 is provided inside the needle seat body 1125. The leak-proof gasket 107 is sleeved outside the plunger 1042. A second through hole for the plunger 1042 to pass through is formed on the leak-proof gasket 107, and the plunger 1042 operably plugs the orifice of the second through hole. Thus, the second through hole provided on the leak-proof gasket 107 can ensure that the glue can smoothly flow to the glue outlet 103 during the normal operation of the spray valve. When the needle 1126 needs to be replaced, the plunger 1042 can plug the orifice of the second through hole to prevent the glue in the liquid inlet cavity 102 from leaking from the needle seat due to the failure to relieve the pressure of the feeding assembly 3 when replacing the needle 1126.

[0043] Specifically, a tapered surface is formed on the outer wall of the plunger 1042, and a chamfered inclined surface is provided at the orifice of the second through hole of the leak-proof gasket 107. When the needle 1126 needs to be replaced, the plunger 1042 moves downward under the reset action of the elastic force of the return spring 105 until the tapered surface fits with the chamfered inclined surface to form a plug, preventing the glue from leaking from the second through hole.

[0044] In this embodiment, referring to Figure 12 As shown, the upper end of the needle seat body 1125 is provided in a hexagonal column structure, and six gap air channels are formed between the outer wall surface of the hexagonal column and the inner wall surface of the spray cap 1121. These six gap air channels form a primary homogenizing air channel 1123. Referring to Figure 13 As shown, the secondary homogenizing air channel 1124 includes a plurality of secondary air holes. The plurality of secondary air holes are evenly distributed along the circumferential direction of the spray cap 1121. Specifically, the number of secondary air holes is three, and the three arc-shaped secondary air holes are arranged in a circular array, so that the secondary homogenizing air channel 1124 as a whole has a petal-like structure. By designing the two-stage air flow homogenizing structure, it is ensured that the atomizing gas can be evenly dispersed, improving the uniformity of glue atomization.

[0045] In this embodiment, the upper end of the needle seat body 1125 is threadedly connected to the fluid tank 111, and a secondary sealing gasket 106 is provided between the needle seat body 1125 and the fluid tank 111. Thus, the needle seat body 1125 and the fluid tank 111 are threadedly connected, which is convenient for disassembly and assembly, and a secondary sealing gasket 106 is provided between the two to prevent the glue from entering the thread and curing, resulting in inability to disassemble.

[0046] In this embodiment, the glue outlet 103 is composed of a sealing port 1031 and a spraying port 1032. The sealing port 1031 and the spraying port 1032 are connected through a turbulent flow channel 1033. The impact end of the piston plunger 104 is used to open and close the sealing port 1031. When the sealing port 1031 is opened, the glue flows out from the sealing port 1031 and is ejected from the spraying port 1032 after passing through the turbulent flow channel 1033 and undergoing turbulence.

[0047] In this embodiment, referring to Figure 14As shown, the spray cap 1121 is sleeved outside the needle 1126. The length of the atomizing port 1122 at the lower end of the spray cap 1121 is greater than the length of the turbulent flow channel 1033 at the lower end of the needle 1126. Therefore, the ejection port 1032 is located within the atomizing port 1122, and this structure constitutes an internal atomization structure.

[0048] In this embodiment, a sealing assembly 118 is provided at the connection between the piston cylinder 110 and the fluid tank 111. The sealing assembly 118 is sleeved around the outer periphery of the rod of the piston striker 104, and the sealing assembly 118 is used to prevent the gas in the first air chamber 101 from communicating with the glue in the liquid inlet chamber 102.

[0049] Specifically, refer to Figure 10 As shown, the sealing assembly 118 includes: a second O-ring 1181, a pantograph mounting block 1182, a pantograph seal 1183, and a third O-ring 1184 that are sequentially sleeved around the outer periphery of the rod of the piston striker 104 from top to bottom along the axis. The second O-ring 1181 is used to prevent gas from entering the liquid inlet chamber 102, and the pantograph seal 1183 and the third O-ring 1184 are used to prevent the glue from entering the first air chamber 101. The pantograph mounting block 1182 has a clearance fit with the piston cylinder 110. A first leakage hole 1185 is opened in the pantograph mounting block 1182, and a second leakage hole 1186 is opened in the piston cylinder 110. The second leakage hole 1186 extends from the outer wall of the piston cylinder 110 inward and communicates with the first leakage hole 1185. When gas or glue flows from the first leakage hole 1185 to the second leakage hole 1186, it indicates that the sealing assembly 118 at the connection between the piston cylinder 110 and the fluid tank 111 has failed in sealing, and the sealing assembly 118 needs to be replaced.

[0050] In this embodiment, a micrometer 119 is provided on the main valve body 1. One end of the micrometer 119 extends into the upper chamber 124 and is connected to the piston striker 104 through a return spring 105. Thus, by adjusting the micrometer 119, a micrometer-level control of the stroke of the piston striker 104 is achieved, and precise flow control is achieved.

[0051] In this embodiment, the spray valve further includes: a heating module 4. The heating module 4 is detachably installed outside the main valve body 1 and is used to heat the glue. Thus, in the spraying operation of high-viscosity glue, by setting the heating module 4, the viscosity of the glue can be effectively reduced, making it easier to flow and atomize, thereby improving the uniformity of spraying. When the heated glue is mixed with the atomizing gas, it can interact more fully with the atomizing gas to form finer droplets, improving the atomization effect and uniformity of the glue.

[0052] Specifically, the heating module 4 includes a cavity heating block 401, a junction box 402, and a cable locking seat 403. The cavity heating block 401 is installed on the fluid tank 111 by quick-release screws 406. A heating rod 404 is provided inside the cavity heating block 401, and a platinum resistor 405 for detecting temperature is provided inside the cavity heating block 401. The cable locking seat 403 is provided on the junction box 402, and the junction box 402 is installed on the cavity heating block 401. Thus, the cavity heating block 401 is installed on the fluid tank 111 by quick-release screws 406, making the installation and disassembly process of the heating module 4 more convenient, improving production efficiency. The platinum resistor 405 for detecting temperature is provided to be able to monitor the heating temperature in real time and feed the temperature signal back to the controller in the machine control cabinet. The controller in the machine control cabinet adjusts the power of the heating rod 404 according to the feedback signal to achieve precise temperature control and further improve the atomization quality. By providing the junction box 402 and the cable locking seat 403, the circuit is protected and the stable connection of the electrical circuit is ensured.

[0053] In this embodiment, the negative pressure suction device of the controller is connected to the second air inlet channel 1127. When the spray valve does not work for a long time or the glue inside the valve solidifies, the lower end of the atomization assembly 112 is immersed in the cleaning agent, and the controller controls the negative pressure suction device to suck back, sucking the cleaning agent into the atomization assembly 112 from the glue outlet 103, and using the fluid pulse of the cleaning agent to periodically remove impurities.

[0054] The above are only preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly.

[0055] On the basis of the above, the present invention also has the following implementation manners: Embodiment 2: As Figures 18 to 21 shown, The difference from Embodiment 1 is that: An homogenizing block 1128 is sleeved outside the needle seat body 1125. The homogenizing block 1128 is tightly and cooperatively connected to the needle seat body 1125. The primary homogenizing air channel 1123 is opened on the homogenizing block 1128. The spray cap 1121 is sleeved outside the homogenizing block 1128 and the needle seat body 1125, and is tightly and cooperatively connected to the homogenizing block 1128 and the needle seat body 1125. By adding the homogenizing block 1128, the flow area of the atomizing gas is increased compared with Embodiment 1, the pore distribution is more uniform, and the flow resistance of the gas passing through is effectively reduced.

[0056] In this embodiment, the primary homogenizing air duct 1123 includes a plurality of primary air holes, and the plurality of primary air holes are evenly distributed along the circumferential direction of the homogenizing block 1128. Thus, the primary homogenizing air duct 1123 adopts a porous structure with circumferential uniform distribution to disperse the air flow path, reduce the local air flow resistance, and still maintain a stable air flow output under low-pressure conditions, avoiding atomization interruption or local uneven atomization caused by insufficient pressure.

[0057] Specifically, referring to Figure 19 As shown, the radial cross-section of each primary air hole is a circular structure. Thus, the primary air holes adopt a circular structure without sharp corners, avoiding the generation of eddy currents or turbulence at the corners of the air flow, enabling the air flow to pass through more smoothly, and thereby reducing the consumption of gas usage.

[0058] Specifically, the number of primary air holes is eight, and the aperture of each primary air hole is 1.5 mm.

[0059] Specifically, referring to Figure 20 As shown, the secondary homogenizing air duct 1124 includes four secondary air holes, and the four secondary air holes with an arc-shaped structure are arranged in a circular array, making the overall secondary homogenizing air duct 1124 present a petal-shaped structure.

[0060] Embodiment 3: As Figure 22 shown, The difference from Embodiment 1 is that: Referring to Figure 22 As shown, the spray cap 1121 is sleeved outside the needle 1126, and the length of the atomizing port 1122 at the lower end of the spray cap 1121 is less than the length of the turbulent flow channel 1033 at the lower end of the needle 1126. Therefore, the injection port 1032 is located outside the atomizing port 1122, and this structure constitutes an external atomization structure. During the actual production process, only the specifications of the spray cap 1121 or the needle 1126 need to be replaced, and by adjusting the length spacing between the atomizing port 1122 and the injection port 1032, the spraying of adhesives with different viscosities can be adapted, and thus the spraying width can be adjusted.

[0061] Embodiment 4: As Figures 23 to 24 shown, The difference from Embodiment 1 is that: The piston striker 104 includes a piston assembly and a striker 1042. The piston assembly and the striker 1042 are of a split structure. The upper end of the striker 1042 is detachably connected to the piston assembly. Compared with the integral piston striker 104 in Embodiment 1, where the entire rod material needs to be processed into a part with a complex geometric shape and extremely high precision requirements, involving multiple high-precision processes, which are extremely demanding on the precision, rigidity, and stability of the processing equipment. Especially in the structure of the integral piston striker 104, high-precision and high-cost numerical control machine tools and special tools are required to complete the slender striker 1042 part and the special piston 1041 head structure. And after multiple processes, the finished integral piston striker 104 accumulates multiple processing errors. In this embodiment, the striker 1042 and the piston assembly adopt a split design. This split structure can process and manufacture each component separately during the processing, avoiding the complex processes and high difficulty requirements brought by integral processing, thereby reducing the processing difficulty, saving the processing cost, and shortening the processing cycle. When the striker 1042 is worn out and fails, since the striker 1042 and the piston assembly are detachably connected, only the striker 1042 needs to be replaced, without replacing the entire piston striker 104, extending the service life of the entire piston striker 104 assembly, reducing the quantity and scope of parts replacement, and further reducing the maintenance cost of the parts.

[0062] Specifically, the piston assembly includes: a piston 1041, a flange cover 1043, and a fastening screw 1044. The flange cover 1043 is connected to the piston 1041 through the fastening screw 1044. The upper end of the striker 1042 is embedded in the piston 1041, and the rod body of the striker 1042 penetrates through the flange cover 1043 and inserts into the liquid inlet cavity 102. Thus, through the design of the flange cover 1043 and the fastening screw 1044, the fixation of the striker 1042 and the piston 1041 is realized, so that during the movement of the piston assembly driving the striker 1042, the striker 1042 will not loosen or shake, ensuring that the piston 1041 can accurately drive the impact end of the striker 1042 to open or block the glue outlet 103, improving the stability and reliability of the equipment operation; when the striker 1042 needs to be replaced, only the fastening screw 1044 needs to be loosened and the flange cover 1043 removed to realize the separation of the striker 1042 and the piston 1041, making the disassembly and assembly process of the striker 1042 simple and fast.

[0063] Specifically, the striker 1042 is made of a stainless steel striker, a tungsten steel striker, or a ceramic striker. Thus, tungsten steel has high hardness, high wear resistance, and good corrosion resistance, and is suitable for processing high-hardness, high-viscosity, or corrosive glue liquids. The ceramic material has excellent wear resistance, high temperature resistance, and chemical stability, and can be suitable for the dispensing requirements in high-temperature environments.

[0064] Embodiment 5: A spraying method, which is applied to the spray valve in any one of the above embodiments, and includes the following steps: Step S1: Before spraying, start the feeding assembly 3. The feeding assembly 3 continuously conveys the glue to the liquid inlet cavity 102. At this time, the impact end of the piston striker 104 blocks the glue outlet 103; Step S2: The valve-opening gas enters the valve-opening solenoid valve 201 through the first air inlet joint 502. At this time, the valve-opening solenoid valve 201 is closed, and the atomizing gas enters the atomizing solenoid valve 202 through the second air inlet joint 504. At this time, the atomizing solenoid valve 202 is closed; Step S3: During spraying, the controller located in the machine tool control cabinet sends a spraying signal to the pneumatic control module 2. At this time, the atomizing solenoid valve 202 is first opened to convey the atomizing gas to the second air cavity 123. The atomizing gas sequentially passes through the second diversion channel II 509, the second air inlet channel 1127, the primary homogenizing air channel 1123, the first homogenizing cavity, the secondary homogenizing air channel 1124, and the second homogenizing cavity and then sprays out from the atomizing port 1122; Step S4: Then the valve-opening solenoid valve 201 is opened and conveys the valve-opening gas to the first air cavity 101. The valve-opening gas sequentially passes through the first diversion channel II 506 and the first air inlet channel 1011 and then enters the lower cavity 1012. In the lower cavity 1012, the valve-opening gas pushes the piston end of the piston striker 104 to move upward. The piston end of the piston striker 104 compresses the return spring 105. At the same time, the impact end of the piston striker 104 is separated from the glue outlet 103, thereby opening the glue outlet 103. At this time, the glue flows out of the glue outlet 103; Step S5: The atomizing gas sprayed out from the atomizing port 1122 atomizes the glue discharged from the glue outlet 103; Step S6: The glue atomized in Step S5 is sprayed onto the product surface; Step S7: After spraying, the controller located in the machine tool control cabinet sends a stop signal to the pneumatic control module 2 and the feeding assembly 3; Step S8: After the feeding assembly 3 receives the stop signal, the feeding assembly 3 stops supplying glue. After the pneumatic control module 2 receives the stop signal, the valve-opening solenoid valve 201 is first closed to stop conveying gas to the first air cavity 101. In the first air cavity 101, the piston striker 104 moves downward and resets under the elastic force of the return spring 105 to close the glue outlet 103, and then the atomizing solenoid valve 202 is closed to stop conveying gas to the second air cavity 123.

[0065] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0066] Based on the above inspiration from the ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A spray valve, characterized in that, Comprising: A main valve body (1), inside which a first air chamber (101), a second air chamber (123) and a liquid inlet chamber (102) are provided. The main valve body (1) has a glue outlet (103) communicating with the liquid inlet chamber (102). The air outlet end of the second air chamber (123) surrounds the glue outlet (103) to form an annular air passage. A piston punch (104) that can move up and down and a return spring (105) for urging the piston punch (104) to move downward are installed inside the main valve body (1). The upper end of the piston punch (104) is located inside the first air chamber (101), and the lower end of the piston punch (104) extends into the liquid inlet chamber (102) and can open and close the glue outlet (103); An air control module (2), which includes an open valve solenoid valve (201) and an atomizing solenoid valve (202). The open valve solenoid valve (201) and the atomizing solenoid valve (202) are both installed on the main valve body (1). The open valve solenoid valve (201) communicates with the first air chamber (101), and the atomizing solenoid valve (202) communicates with the second air chamber (123); A feeding assembly (3), which is installed on the main valve body (1) and conveys glue to the liquid inlet chamber (102); Wherein, when the open valve solenoid valve (201) is opened to convey gas into the first air chamber (101) to push the piston punch (104) to move upward, thereby opening the glue outlet (103); When the atomizing solenoid valve (202) is opened to convey gas into the second air chamber (123), the gas passing through the annular air passage atomizes the glue at the glue outlet (103).

2. The spray valve according to claim 1, wherein The spray valve further includes a double valve deflector (5), which is arranged between the main valve body (1) and the air control module (2). A first air inlet joint (502) and a second air inlet joint (504) are installed on the double valve deflector (5). A first diversion channel Ⅰ (505) for communicating the open valve solenoid valve (201) with the first air inlet joint (502), a first diversion channel Ⅱ (506) for communicating the open valve solenoid valve (201) with the first air chamber (101), a second diversion channel Ⅰ (508) for communicating the atomizing solenoid valve (202) with the second air inlet joint (504), and a second diversion channel Ⅱ (509) for communicating the atomizing solenoid valve (202) with the second air chamber (123) are opened inside the double valve deflector (5).

3. The spray valve according to claim 2, characterized in that, A first silencer (501) and a second silencer (503) are installed on the double valve deflector (5). A first diversion channel Ⅲ (507) for communicating the open valve solenoid valve (201) with the first silencer (501) and a second diversion channel Ⅲ (510) for communicating the atomizing solenoid valve (202) with the second silencer (503) are opened inside the double valve deflector (5).

4. The spray valve according to claim 1, characterized in that, The pneumatic control module (2) is mounted on the main valve body (1) along a first direction, and the feeding assembly (3) is mounted on the main valve body (1) along a second direction, where the first direction is perpendicular to the second direction.

5. The spray valve according to claim 1, characterized in that, The main valve body (1) includes: a piston cylinder (110), a fluid tank (111), and an atomization assembly (112) that are connected in sequence. A piston cavity is defined in the piston cylinder (110). The piston end of the piston striker (104) is movably disposed up and down in the piston cavity and divides the piston cavity into an upper cavity (124) and the first air cavity (101). An exhaust hole (121) communicating with the upper cavity (124) is formed in the piston cylinder (110). The rod body of the piston striker (104) passes through the fluid tank (111), and the striking end of the piston striker (104) extends into the atomization assembly (112). The glue in the liquid inlet cavity (102) flows into the atomization assembly (112), and a glue outlet (103) is formed in the atomization assembly (112).

6. The spray valve according to claim 5, characterized in that, A snap ring (122) is disposed in the upper cavity (124). The snap ring (122) is located above the piston striker (104) to limit the upward movement of the piston striker (104).

7. The spray valve according to claim 5, wherein, A sealing assembly (118) is provided at the connection between the piston cylinder (110) and the fluid tank (111). The sealing assembly (118) is sleeved around the rod body of the piston striker (104) and is used to prevent the gas in the first air cavity (101) from communicating with the glue in the liquid inlet cavity (102).

8. The spray valve according to claim 5, characterized in that, The atomization assembly (112) includes: a needle seat and a spray cap (1121). The glue outlet (103) is formed in the needle seat. The rod body of the piston striker (104) passes through the fluid tank (111), and the striking end of the piston striker (104) extends into the needle seat. The spray cap (1121) is sleeved outside the needle seat and is tightly connected to the needle seat. A second air cavity (123) is formed between the spray cap (1121) and the needle seat. The second air cavity (123) includes a primary homogenization air duct (1123), a secondary homogenization air duct (1124), and an atomization port (1122) that communicate with each other. The atomization port (1122) surrounds the glue outlet (103) and is coaxially arranged.

9. The spray valve according to claim 1, wherein, The spray valve further includes: a heating module (4). The heating module (4) is detachably mounted outside the main valve body (1) and is used to heat the glue.

10. A spraying method of a spray valve, characterized in that, Applicable to the spray valve according to any one of claims 1 to 9, the spraying method includes the following steps: Step S1: The feeding assembly conveys glue to the liquid inlet cavity. Step S2: The valve opening solenoid valve is opened to convey gas to the first air cavity, and the piston striker of the main valve body opens the glue outlet. Step S3: The atomization solenoid valve is opened to convey gas to the second air cavity to atomize the glue discharged from the glue outlet.

11. The spraying method of the spray valve according to claim 10, characterized in that, The spray valve further includes a double-valve deflector plate which is installed on the main valve body. The valve-opening solenoid valve and the atomizing solenoid valve are both installed on the double-valve deflector plate. The double-valve deflector plate has a first diversion channel Ⅱ for communicating the first air chamber with the valve-opening solenoid valve and a second diversion channel Ⅱ for communicating the atomizing solenoid valve with the second air chamber.

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